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UBIFS: Implement read-only UBIFS support in U-Boot

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The U-Boot UBIFS implementation is largely a direct copy from the current
Linux version (2.6.29-rc6). As already done in the UBI version we have an
"abstraction layer" to redefine or remove some OS calls (e.g. mutex_lock()
...). This makes it possible to use the original Linux code with very
little changes. And by this we can better update to later Linux versions.

I removed some of the Linux features that are not used in the U-Boot
version (e.g. garbage-collection, write support).

Signed-off-by: Stefan Roese <sr@denx.de>
CC: Artem Bityutskiy <dedekind@infradead.org>
CC: Adrian Hunter <ext-Adrian.Hunter@nokia.com>
master
Stefan Roese 16 years ago committed by Wolfgang Denk
parent b1b4e89a0f
commit 9eefe2a2b3
30 changed files with 17067 additions and 2 deletions
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  1. 3
      Makefile
  2. 1
      fs/Makefile
  3. 52
      fs/ubifs/Makefile
  4. 113
      fs/ubifs/budget.c
  5. 60
      fs/ubifs/crc16.c
  6. 30
      fs/ubifs/crc16.h
  7. 156
      fs/ubifs/debug.c
  8. 392
      fs/ubifs/debug.h
  9. 316
      fs/ubifs/io.c
  10. 557
      fs/ubifs/key.h
  11. 104
      fs/ubifs/log.c
  12. 842
      fs/ubifs/lprops.c
  13. 1105
      fs/ubifs/lpt.c
  14. 171
      fs/ubifs/lpt_commit.c
  15. 341
      fs/ubifs/master.c
  16. 310
      fs/ubifs/misc.h
  17. 316
      fs/ubifs/orphan.c
  18. 1249
      fs/ubifs/recovery.c
  19. 1070
      fs/ubifs/replay.c
  20. 324
      fs/ubifs/sb.c
  21. 362
      fs/ubifs/scan.c
  22. 1189
      fs/ubifs/super.c
  23. 2767
      fs/ubifs/tnc.c
  24. 1102
      fs/ubifs/tnc_commit.c
  25. 435
      fs/ubifs/tnc_misc.c
  26. 751
      fs/ubifs/ubifs-media.h
  27. 684
      fs/ubifs/ubifs.c
  28. 2173
      fs/ubifs/ubifs.h
  29. 85
      include/linux/math64.h
  30. 9
      include/ubi_uboot.h

3
Makefile
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@ -222,7 +222,8 @@ LIBS += cpu/ixp/npe/libnpe.a
endif
LIBS += lib_$(ARCH)/lib$(ARCH).a
LIBS += fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a \
fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a fs/yaffs2/libyaffs2.a
fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a fs/yaffs2/libyaffs2.a \
fs/ubifs/libubifs.a
LIBS += net/libnet.a
LIBS += disk/libdisk.a
LIBS += drivers/bios_emulator/libatibiosemu.a

1
fs/Makefile
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@ -29,6 +29,7 @@ subdirs-$(CONFIG_CMD_FDOS) += fdos
subdirs-$(CONFIG_CMD_JFFS2) += jffs2
subdirs-$(CONFIG_CMD_REISER) += reiserfs
subdirs-$(CONFIG_YAFFS2) += yaffs2
subdirs-$(CONFIG_CMD_UBIFS) += ubifs
SUBDIRS := $(subdirs-y)

52
fs/ubifs/Makefile
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@ -0,0 +1,52 @@
#
# (C) Copyright 2006
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# (C) Copyright 2003
# Pavel Bartusek, Sysgo Real-Time Solutions AG, pba@sysgo.de
#
#
# See file CREDITS for list of people who contributed to this
# project.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
include $(TOPDIR)/config.mk
LIB = $(obj)libubifs.a
COBJS-$(CONFIG_CMD_UBIFS) := ubifs.o io.o super.o sb.o master.o lpt.o
COBJS-$(CONFIG_CMD_UBIFS) += lpt_commit.o scan.o lprops.o
COBJS-$(CONFIG_CMD_UBIFS) += tnc.o tnc_misc.o debug.o crc16.o budget.o
COBJS-$(CONFIG_CMD_UBIFS) += log.o orphan.o recovery.o replay.o
SRCS := $(AOBJS:.o=.S) $(COBJS-y:.o=.c)
OBJS := $(addprefix $(obj),$(AOBJS) $(COBJS-y))
all: $(LIB) $(AOBJS)
$(LIB): $(obj).depend $(OBJS)
$(AR) $(ARFLAGS) $@ $(OBJS)
#########################################################################
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
sinclude $(obj).depend
#########################################################################

113
fs/ubifs/budget.c
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@ -0,0 +1,113 @@
/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
/*
* This file implements the budgeting sub-system which is responsible for UBIFS
* space management.
*
* Factors such as compression, wasted space at the ends of LEBs, space in other
* journal heads, the effect of updates on the index, and so on, make it
* impossible to accurately predict the amount of space needed. Consequently
* approximations are used.
*/
#include "ubifs.h"
#include <linux/math64.h>
/**
* ubifs_calc_min_idx_lebs - calculate amount of eraseblocks for the index.
* @c: UBIFS file-system description object
*
* This function calculates and returns the number of eraseblocks which should
* be kept for index usage.
*/
int ubifs_calc_min_idx_lebs(struct ubifs_info *c)
{
int idx_lebs, eff_leb_size = c->leb_size - c->max_idx_node_sz;
long long idx_size;
idx_size = c->old_idx_sz + c->budg_idx_growth + c->budg_uncommitted_idx;
/* And make sure we have thrice the index size of space reserved */
idx_size = idx_size + (idx_size << 1);
/*
* We do not maintain 'old_idx_size' as 'old_idx_lebs'/'old_idx_bytes'
* pair, nor similarly the two variables for the new index size, so we
* have to do this costly 64-bit division on fast-path.
*/
idx_size += eff_leb_size - 1;
idx_lebs = div_u64(idx_size, eff_leb_size);
/*
* The index head is not available for the in-the-gaps method, so add an
* extra LEB to compensate.
*/
idx_lebs += 1;
if (idx_lebs < MIN_INDEX_LEBS)
idx_lebs = MIN_INDEX_LEBS;
return idx_lebs;
}
/**
* ubifs_reported_space - calculate reported free space.
* @c: the UBIFS file-system description object
* @free: amount of free space
*
* This function calculates amount of free space which will be reported to
* user-space. User-space application tend to expect that if the file-system
* (e.g., via the 'statfs()' call) reports that it has N bytes available, they
* are able to write a file of size N. UBIFS attaches node headers to each data
* node and it has to write indexing nodes as well. This introduces additional
* overhead, and UBIFS has to report slightly less free space to meet the above
* expectations.
*
* This function assumes free space is made up of uncompressed data nodes and
* full index nodes (one per data node, tripled because we always allow enough
* space to write the index thrice).
*
* Note, the calculation is pessimistic, which means that most of the time
* UBIFS reports less space than it actually has.
*/
long long ubifs_reported_space(const struct ubifs_info *c, long long free)
{
int divisor, factor, f;
/*
* Reported space size is @free * X, where X is UBIFS block size
* divided by UBIFS block size + all overhead one data block
* introduces. The overhead is the node header + indexing overhead.
*
* Indexing overhead calculations are based on the following formula:
* I = N/(f - 1) + 1, where I - number of indexing nodes, N - number
* of data nodes, f - fanout. Because effective UBIFS fanout is twice
* as less than maximum fanout, we assume that each data node
* introduces 3 * @c->max_idx_node_sz / (@c->fanout/2 - 1) bytes.
* Note, the multiplier 3 is because UBIFS reserves thrice as more space
* for the index.
*/
f = c->fanout > 3 ? c->fanout >> 1 : 2;
factor = UBIFS_BLOCK_SIZE;
divisor = UBIFS_MAX_DATA_NODE_SZ;
divisor += (c->max_idx_node_sz * 3) / (f - 1);
free *= factor;
return div_u64(free, divisor);
}

60
fs/ubifs/crc16.c
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@ -0,0 +1,60 @@
/*
* crc16.c
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#include <linux/types.h>
#include "crc16.h"
/** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */
u16 const crc16_table[256] = {
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
};
/**
* crc16 - compute the CRC-16 for the data buffer
* @crc: previous CRC value
* @buffer: data pointer
* @len: number of bytes in the buffer
*
* Returns the updated CRC value.
*/
u16 crc16(u16 crc, u8 const *buffer, size_t len)
{
while (len--)
crc = crc16_byte(crc, *buffer++);
return crc;
}

30
fs/ubifs/crc16.h
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@ -0,0 +1,30 @@
/*
* crc16.h - CRC-16 routine
*
* Implements the standard CRC-16:
* Width 16
* Poly 0x8005 (x^16 + x^15 + x^2 + 1)
* Init 0
*
* Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#ifndef __CRC16_H
#define __CRC16_H
#include <linux/types.h>
extern u16 const crc16_table[256];
extern u16 crc16(u16 crc, const u8 *buffer, size_t len);
static inline u16 crc16_byte(u16 crc, const u8 data)
{
return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
}
#endif /* __CRC16_H */

156
fs/ubifs/debug.c
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@ -0,0 +1,156 @@
/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/*
* This file implements most of the debugging stuff which is compiled in only
* when it is enabled. But some debugging check functions are implemented in
* corresponding subsystem, just because they are closely related and utilize
* various local functions of those subsystems.
*/
#define UBIFS_DBG_PRESERVE_UBI
#include "ubifs.h"
#ifdef CONFIG_UBIFS_FS_DEBUG
DEFINE_SPINLOCK(dbg_lock);
static char dbg_key_buf0[128];
static char dbg_key_buf1[128];
unsigned int ubifs_msg_flags = UBIFS_MSG_FLAGS_DEFAULT;
unsigned int ubifs_chk_flags = UBIFS_CHK_FLAGS_DEFAULT;
unsigned int ubifs_tst_flags;
module_param_named(debug_msgs, ubifs_msg_flags, uint, S_IRUGO | S_IWUSR);
module_param_named(debug_chks, ubifs_chk_flags, uint, S_IRUGO | S_IWUSR);
module_param_named(debug_tsts, ubifs_tst_flags, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug_msgs, "Debug message type flags");
MODULE_PARM_DESC(debug_chks, "Debug check flags");
MODULE_PARM_DESC(debug_tsts, "Debug special test flags");
static const char *get_key_type(int type)
{
switch (type) {
case UBIFS_INO_KEY:
return "inode";
case UBIFS_DENT_KEY:
return "direntry";
case UBIFS_XENT_KEY:
return "xentry";
case UBIFS_DATA_KEY:
return "data";
case UBIFS_TRUN_KEY:
return "truncate";
default:
return "unknown/invalid key";
}
}
static void sprintf_key(const struct ubifs_info *c, const union ubifs_key *key,
char *buffer)
{
char *p = buffer;
int type = key_type(c, key);
if (c->key_fmt == UBIFS_SIMPLE_KEY_FMT) {
switch (type) {
case UBIFS_INO_KEY:
sprintf(p, "(%lu, %s)", (unsigned long)key_inum(c, key),
get_key_type(type));
break;
case UBIFS_DENT_KEY:
case UBIFS_XENT_KEY:
sprintf(p, "(%lu, %s, %#08x)",
(unsigned long)key_inum(c, key),
get_key_type(type), key_hash(c, key));
break;
case UBIFS_DATA_KEY:
sprintf(p, "(%lu, %s, %u)",
(unsigned long)key_inum(c, key),
get_key_type(type), key_block(c, key));
break;
case UBIFS_TRUN_KEY:
sprintf(p, "(%lu, %s)",
(unsigned long)key_inum(c, key),
get_key_type(type));
break;
default:
sprintf(p, "(bad key type: %#08x, %#08x)",
key->u32[0], key->u32[1]);
}
} else
sprintf(p, "bad key format %d", c->key_fmt);
}
const char *dbg_key_str0(const struct ubifs_info *c, const union ubifs_key *key)
{
/* dbg_lock must be held */
sprintf_key(c, key, dbg_key_buf0);
return dbg_key_buf0;
}
const char *dbg_key_str1(const struct ubifs_info *c, const union ubifs_key *key)
{
/* dbg_lock must be held */
sprintf_key(c, key, dbg_key_buf1);
return dbg_key_buf1;
}
/**
* ubifs_debugging_init - initialize UBIFS debugging.
* @c: UBIFS file-system description object
*
* This function initializes debugging-related data for the file system.
* Returns zero in case of success and a negative error code in case of
* failure.
*/
int ubifs_debugging_init(struct ubifs_info *c)
{
c->dbg = kzalloc(sizeof(struct ubifs_debug_info), GFP_KERNEL);
if (!c->dbg)
return -ENOMEM;
c->dbg->buf = vmalloc(c->leb_size);
if (!c->dbg->buf)
goto out;
return 0;
out:
kfree(c->dbg);
return -ENOMEM;
}
/**
* ubifs_debugging_exit - free debugging data.
* @c: UBIFS file-system description object
*/
void ubifs_debugging_exit(struct ubifs_info *c)
{
vfree(c->dbg->buf);
kfree(c->dbg);
}
#endif /* CONFIG_UBIFS_FS_DEBUG */

392
fs/ubifs/debug.h
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
#ifndef __UBIFS_DEBUG_H__
#define __UBIFS_DEBUG_H__
#ifdef CONFIG_UBIFS_FS_DEBUG
/**
* ubifs_debug_info - per-FS debugging information.
* @buf: a buffer of LEB size, used for various purposes
* @old_zroot: old index root - used by 'dbg_check_old_index()'
* @old_zroot_level: old index root level - used by 'dbg_check_old_index()'
* @old_zroot_sqnum: old index root sqnum - used by 'dbg_check_old_index()'
* @failure_mode: failure mode for recovery testing
* @fail_delay: 0=>don't delay, 1=>delay a time, 2=>delay a number of calls
* @fail_timeout: time in jiffies when delay of failure mode expires
* @fail_cnt: current number of calls to failure mode I/O functions
* @fail_cnt_max: number of calls by which to delay failure mode
* @chk_lpt_sz: used by LPT tree size checker
* @chk_lpt_sz2: used by LPT tree size checker
* @chk_lpt_wastage: used by LPT tree size checker
* @chk_lpt_lebs: used by LPT tree size checker
* @new_nhead_offs: used by LPT tree size checker
* @new_ihead_lnum: used by debugging to check @c->ihead_lnum
* @new_ihead_offs: used by debugging to check @c->ihead_offs
*
* @saved_lst: saved lprops statistics (used by 'dbg_save_space_info()')
* @saved_free: saved free space (used by 'dbg_save_space_info()')
*
* dfs_dir_name: name of debugfs directory containing this file-system's files
* dfs_dir: direntry object of the file-system debugfs directory
* dfs_dump_lprops: "dump lprops" debugfs knob
* dfs_dump_budg: "dump budgeting information" debugfs knob
* dfs_dump_tnc: "dump TNC" debugfs knob
*/
struct ubifs_debug_info {
void *buf;
struct ubifs_zbranch old_zroot;
int old_zroot_level;
unsigned long long old_zroot_sqnum;
int failure_mode;
int fail_delay;
unsigned long fail_timeout;
unsigned int fail_cnt;
unsigned int fail_cnt_max;
long long chk_lpt_sz;
long long chk_lpt_sz2;
long long chk_lpt_wastage;
int chk_lpt_lebs;
int new_nhead_offs;
int new_ihead_lnum;
int new_ihead_offs;
struct ubifs_lp_stats saved_lst;
long long saved_free;
char dfs_dir_name[100];
struct dentry *dfs_dir;
struct dentry *dfs_dump_lprops;
struct dentry *dfs_dump_budg;
struct dentry *dfs_dump_tnc;
};
#define UBIFS_DBG(op) op
#define ubifs_assert(expr) do { \
if (unlikely(!(expr))) { \
printk(KERN_CRIT "UBIFS assert failed in %s at %u (pid %d)\n", \
__func__, __LINE__, 0); \
dbg_dump_stack(); \
} \
} while (0)
#define ubifs_assert_cmt_locked(c) do { \
if (unlikely(down_write_trylock(&(c)->commit_sem))) { \
up_write(&(c)->commit_sem); \
printk(KERN_CRIT "commit lock is not locked!\n"); \
ubifs_assert(0); \
} \
} while (0)
#define dbg_dump_stack() do { \
if (!dbg_failure_mode) \
dump_stack(); \
} while (0)
/* Generic debugging messages */
#define dbg_msg(fmt, ...) do { \
spin_lock(&dbg_lock); \
printk(KERN_DEBUG "UBIFS DBG (pid %d): %s: " fmt "\n", 0, \
__func__, ##__VA_ARGS__); \
spin_unlock(&dbg_lock); \
} while (0)
#define dbg_do_msg(typ, fmt, ...) do { \
if (ubifs_msg_flags & typ) \
dbg_msg(fmt, ##__VA_ARGS__); \
} while (0)
#define dbg_err(fmt, ...) do { \
spin_lock(&dbg_lock); \
ubifs_err(fmt, ##__VA_ARGS__); \
spin_unlock(&dbg_lock); \
} while (0)
const char *dbg_key_str0(const struct ubifs_info *c,
const union ubifs_key *key);
const char *dbg_key_str1(const struct ubifs_info *c,
const union ubifs_key *key);
/*
* DBGKEY macros require @dbg_lock to be held, which it is in the dbg message
* macros.
*/
#define DBGKEY(key) dbg_key_str0(c, (key))
#define DBGKEY1(key) dbg_key_str1(c, (key))
/* General messages */
#define dbg_gen(fmt, ...) dbg_do_msg(UBIFS_MSG_GEN, fmt, ##__VA_ARGS__)
/* Additional journal messages */
#define dbg_jnl(fmt, ...) dbg_do_msg(UBIFS_MSG_JNL, fmt, ##__VA_ARGS__)
/* Additional TNC messages */
#define dbg_tnc(fmt, ...) dbg_do_msg(UBIFS_MSG_TNC, fmt, ##__VA_ARGS__)
/* Additional lprops messages */
#define dbg_lp(fmt, ...) dbg_do_msg(UBIFS_MSG_LP, fmt, ##__VA_ARGS__)
/* Additional LEB find messages */
#define dbg_find(fmt, ...) dbg_do_msg(UBIFS_MSG_FIND, fmt, ##__VA_ARGS__)
/* Additional mount messages */
#define dbg_mnt(fmt, ...) dbg_do_msg(UBIFS_MSG_MNT, fmt, ##__VA_ARGS__)
/* Additional I/O messages */
#define dbg_io(fmt, ...) dbg_do_msg(UBIFS_MSG_IO, fmt, ##__VA_ARGS__)
/* Additional commit messages */
#define dbg_cmt(fmt, ...) dbg_do_msg(UBIFS_MSG_CMT, fmt, ##__VA_ARGS__)
/* Additional budgeting messages */
#define dbg_budg(fmt, ...) dbg_do_msg(UBIFS_MSG_BUDG, fmt, ##__VA_ARGS__)
/* Additional log messages */
#define dbg_log(fmt, ...) dbg_do_msg(UBIFS_MSG_LOG, fmt, ##__VA_ARGS__)
/* Additional gc messages */
#define dbg_gc(fmt, ...) dbg_do_msg(UBIFS_MSG_GC, fmt, ##__VA_ARGS__)
/* Additional scan messages */
#define dbg_scan(fmt, ...) dbg_do_msg(UBIFS_MSG_SCAN, fmt, ##__VA_ARGS__)
/* Additional recovery messages */
#define dbg_rcvry(fmt, ...) dbg_do_msg(UBIFS_MSG_RCVRY, fmt, ##__VA_ARGS__)
/*
* Debugging message type flags (must match msg_type_names in debug.c).
*
* UBIFS_MSG_GEN: general messages
* UBIFS_MSG_JNL: journal messages
* UBIFS_MSG_MNT: mount messages
* UBIFS_MSG_CMT: commit messages
* UBIFS_MSG_FIND: LEB find messages
* UBIFS_MSG_BUDG: budgeting messages
* UBIFS_MSG_GC: garbage collection messages
* UBIFS_MSG_TNC: TNC messages
* UBIFS_MSG_LP: lprops messages
* UBIFS_MSG_IO: I/O messages
* UBIFS_MSG_LOG: log messages
* UBIFS_MSG_SCAN: scan messages
* UBIFS_MSG_RCVRY: recovery messages
*/
enum {
UBIFS_MSG_GEN = 0x1,
UBIFS_MSG_JNL = 0x2,
UBIFS_MSG_MNT = 0x4,
UBIFS_MSG_CMT = 0x8,
UBIFS_MSG_FIND = 0x10,
UBIFS_MSG_BUDG = 0x20,
UBIFS_MSG_GC = 0x40,
UBIFS_MSG_TNC = 0x80,
UBIFS_MSG_LP = 0x100,
UBIFS_MSG_IO = 0x200,
UBIFS_MSG_LOG = 0x400,
UBIFS_MSG_SCAN = 0x800,
UBIFS_MSG_RCVRY = 0x1000,
};
/* Debugging message type flags for each default debug message level */
#define UBIFS_MSG_LVL_0 0
#define UBIFS_MSG_LVL_1 0x1
#define UBIFS_MSG_LVL_2 0x7f
#define UBIFS_MSG_LVL_3 0xffff
/*
* Debugging check flags (must match chk_names in debug.c).
*
* UBIFS_CHK_GEN: general checks
* UBIFS_CHK_TNC: check TNC
* UBIFS_CHK_IDX_SZ: check index size
* UBIFS_CHK_ORPH: check orphans
* UBIFS_CHK_OLD_IDX: check the old index
* UBIFS_CHK_LPROPS: check lprops
* UBIFS_CHK_FS: check the file-system
*/
enum {
UBIFS_CHK_GEN = 0x1,
UBIFS_CHK_TNC = 0x2,
UBIFS_CHK_IDX_SZ = 0x4,
UBIFS_CHK_ORPH = 0x8,
UBIFS_CHK_OLD_IDX = 0x10,
UBIFS_CHK_LPROPS = 0x20,
UBIFS_CHK_FS = 0x40,
};
/*
* Special testing flags (must match tst_names in debug.c).
*
* UBIFS_TST_FORCE_IN_THE_GAPS: force the use of in-the-gaps method
* UBIFS_TST_RCVRY: failure mode for recovery testing
*/
enum {
UBIFS_TST_FORCE_IN_THE_GAPS = 0x2,
UBIFS_TST_RCVRY = 0x4,
};
#if CONFIG_UBIFS_FS_DEBUG_MSG_LVL == 1
#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_1
#elif CONFIG_UBIFS_FS_DEBUG_MSG_LVL == 2
#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_2
#elif CONFIG_UBIFS_FS_DEBUG_MSG_LVL == 3
#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_3
#else
#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_0
#endif
#ifdef CONFIG_UBIFS_FS_DEBUG_CHKS
#define UBIFS_CHK_FLAGS_DEFAULT 0xffffffff
#else
#define UBIFS_CHK_FLAGS_DEFAULT 0
#endif
#define dbg_ntype(type) ""
#define dbg_cstate(cmt_state) ""
#define dbg_get_key_dump(c, key) ({})
#define dbg_dump_inode(c, inode) ({})
#define dbg_dump_node(c, node) ({})
#define dbg_dump_budget_req(req) ({})
#define dbg_dump_lstats(lst) ({})
#define dbg_dump_budg(c) ({})
#define dbg_dump_lprop(c, lp) ({})
#define dbg_dump_lprops(c) ({})
#define dbg_dump_lpt_info(c) ({})
#define dbg_dump_leb(c, lnum) ({})
#define dbg_dump_znode(c, znode) ({})
#define dbg_dump_heap(c, heap, cat) ({})
#define dbg_dump_pnode(c, pnode, parent, iip) ({})
#define dbg_dump_tnc(c) ({})
#define dbg_dump_index(c) ({})
#define dbg_walk_index(c, leaf_cb, znode_cb, priv) 0
#define dbg_old_index_check_init(c, zroot) 0
#define dbg_check_old_index(c, zroot) 0
#define dbg_check_cats(c) 0
#define dbg_check_ltab(c) 0
#define dbg_chk_lpt_free_spc(c) 0
#define dbg_chk_lpt_sz(c, action, len) 0
#define dbg_check_synced_i_size(inode) 0
#define dbg_check_dir_size(c, dir) 0
#define dbg_check_tnc(c, x) 0
#define dbg_check_idx_size(c, idx_size) 0
#define dbg_check_filesystem(c) 0
#define dbg_check_heap(c, heap, cat, add_pos) ({})
#define dbg_check_lprops(c) 0
#define dbg_check_lpt_nodes(c, cnode, row, col) 0
#define dbg_force_in_the_gaps_enabled 0
#define dbg_force_in_the_gaps() 0
#define dbg_failure_mode 0
#define dbg_failure_mode_registration(c) ({})
#define dbg_failure_mode_deregistration(c) ({})
int ubifs_debugging_init(struct ubifs_info *c);
void ubifs_debugging_exit(struct ubifs_info *c);
#else /* !CONFIG_UBIFS_FS_DEBUG */
#define UBIFS_DBG(op)
/* Use "if (0)" to make compiler check arguments even if debugging is off */
#define ubifs_assert(expr) do { \
if (0 && (expr)) \
printk(KERN_CRIT "UBIFS assert failed in %s at %u (pid %d)\n", \
__func__, __LINE__, 0); \
} while (0)
#define dbg_err(fmt, ...) do { \
if (0) \
ubifs_err(fmt, ##__VA_ARGS__); \
} while (0)
#define dbg_msg(fmt, ...) do { \
if (0) \
printk(KERN_DEBUG "UBIFS DBG (pid %d): %s: " fmt "\n", \
0, __func__, ##__VA_ARGS__); \
} while (0)
#define dbg_dump_stack()
#define ubifs_assert_cmt_locked(c)
#define dbg_gen(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_jnl(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_tnc(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_lp(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_find(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_mnt(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_io(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_cmt(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_budg(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_log(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_gc(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_scan(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_rcvry(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define DBGKEY(key) ((char *)(key))
#define DBGKEY1(key) ((char *)(key))
#define ubifs_debugging_init(c) 0
#define ubifs_debugging_exit(c) ({})
#define dbg_ntype(type) ""
#define dbg_cstate(cmt_state) ""
#define dbg_get_key_dump(c, key) ({})
#define dbg_dump_inode(c, inode) ({})
#define dbg_dump_node(c, node) ({})
#define dbg_dump_budget_req(req) ({})
#define dbg_dump_lstats(lst) ({})
#define dbg_dump_budg(c) ({})
#define dbg_dump_lprop(c, lp) ({})
#define dbg_dump_lprops(c) ({})
#define dbg_dump_lpt_info(c) ({})
#define dbg_dump_leb(c, lnum) ({})
#define dbg_dump_znode(c, znode) ({})
#define dbg_dump_heap(c, heap, cat) ({})
#define dbg_dump_pnode(c, pnode, parent, iip) ({})
#define dbg_dump_tnc(c) ({})
#define dbg_dump_index(c) ({})
#define dbg_walk_index(c, leaf_cb, znode_cb, priv) 0
#define dbg_old_index_check_init(c, zroot) 0
#define dbg_check_old_index(c, zroot) 0
#define dbg_check_cats(c) 0
#define dbg_check_ltab(c) 0
#define dbg_chk_lpt_free_spc(c) 0
#define dbg_chk_lpt_sz(c, action, len) 0
#define dbg_check_synced_i_size(inode) 0
#define dbg_check_dir_size(c, dir) 0
#define dbg_check_tnc(c, x) 0
#define dbg_check_idx_size(c, idx_size) 0
#define dbg_check_filesystem(c) 0
#define dbg_check_heap(c, heap, cat, add_pos) ({})
#define dbg_check_lprops(c) 0
#define dbg_check_lpt_nodes(c, cnode, row, col) 0
#define dbg_force_in_the_gaps_enabled 0
#define dbg_force_in_the_gaps() 0
#define dbg_failure_mode 0
#define dbg_failure_mode_registration(c) ({})
#define dbg_failure_mode_deregistration(c) ({})
#endif /* !CONFIG_UBIFS_FS_DEBUG */
#endif /* !__UBIFS_DEBUG_H__ */

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fs/ubifs/io.c
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
* Copyright (C) 2006, 2007 University of Szeged, Hungary
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
* Zoltan Sogor
*/
/*
* This file implements UBIFS I/O subsystem which provides various I/O-related
* helper functions (reading/writing/checking/validating nodes) and implements
* write-buffering support. Write buffers help to save space which otherwise
* would have been wasted for padding to the nearest minimal I/O unit boundary.
* Instead, data first goes to the write-buffer and is flushed when the
* buffer is full or when it is not used for some time (by timer). This is
* similar to the mechanism is used by JFFS2.
*
* Write-buffers are defined by 'struct ubifs_wbuf' objects and protected by
* mutexes defined inside these objects. Since sometimes upper-level code
* has to lock the write-buffer (e.g. journal space reservation code), many
* functions related to write-buffers have "nolock" suffix which means that the
* caller has to lock the write-buffer before calling this function.
*
* UBIFS stores nodes at 64 bit-aligned addresses. If the node length is not
* aligned, UBIFS starts the next node from the aligned address, and the padded
* bytes may contain any rubbish. In other words, UBIFS does not put padding
* bytes in those small gaps. Common headers of nodes store real node lengths,
* not aligned lengths. Indexing nodes also store real lengths in branches.
*
* UBIFS uses padding when it pads to the next min. I/O unit. In this case it
* uses padding nodes or padding bytes, if the padding node does not fit.
*
* All UBIFS nodes are protected by CRC checksums and UBIFS checks all nodes
* every time they are read from the flash media.
*/
#include "ubifs.h"
/**
* ubifs_ro_mode - switch UBIFS to read read-only mode.
* @c: UBIFS file-system description object
* @err: error code which is the reason of switching to R/O mode
*/
void ubifs_ro_mode(struct ubifs_info *c, int err)
{
if (!c->ro_media) {
c->ro_media = 1;
c->no_chk_data_crc = 0;
ubifs_warn("switched to read-only mode, error %d", err);
dbg_dump_stack();
}
}
/**
* ubifs_check_node - check node.
* @c: UBIFS file-system description object
* @buf: node to check
* @lnum: logical eraseblock number
* @offs: offset within the logical eraseblock
* @quiet: print no messages
* @must_chk_crc: indicates whether to always check the CRC
*
* This function checks node magic number and CRC checksum. This function also
* validates node length to prevent UBIFS from becoming crazy when an attacker
* feeds it a file-system image with incorrect nodes. For example, too large
* node length in the common header could cause UBIFS to read memory outside of
* allocated buffer when checking the CRC checksum.
*
* This function may skip data nodes CRC checking if @c->no_chk_data_crc is
* true, which is controlled by corresponding UBIFS mount option. However, if
* @must_chk_crc is true, then @c->no_chk_data_crc is ignored and CRC is
* checked. Similarly, if @c->always_chk_crc is true, @c->no_chk_data_crc is
* ignored and CRC is checked.
*
* This function returns zero in case of success and %-EUCLEAN in case of bad
* CRC or magic.
*/
int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
int offs, int quiet, int must_chk_crc)
{
int err = -EINVAL, type, node_len;
uint32_t crc, node_crc, magic;
const struct ubifs_ch *ch = buf;
ubifs_assert(lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
ubifs_assert(!(offs & 7) && offs < c->leb_size);
magic = le32_to_cpu(ch->magic);
if (magic != UBIFS_NODE_MAGIC) {
if (!quiet)
ubifs_err("bad magic %#08x, expected %#08x",
magic, UBIFS_NODE_MAGIC);
err = -EUCLEAN;
goto out;
}
type = ch->node_type;
if (type < 0 || type >= UBIFS_NODE_TYPES_CNT) {
if (!quiet)
ubifs_err("bad node type %d", type);
goto out;
}
node_len = le32_to_cpu(ch->len);
if (node_len + offs > c->leb_size)
goto out_len;
if (c->ranges[type].max_len == 0) {
if (node_len != c->ranges[type].len)
goto out_len;
} else if (node_len < c->ranges[type].min_len ||
node_len > c->ranges[type].max_len)
goto out_len;
if (!must_chk_crc && type == UBIFS_DATA_NODE && !c->always_chk_crc &&
c->no_chk_data_crc)
return 0;
crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
node_crc = le32_to_cpu(ch->crc);
if (crc != node_crc) {
if (!quiet)
ubifs_err("bad CRC: calculated %#08x, read %#08x",
crc, node_crc);
err = -EUCLEAN;
goto out;
}
return 0;
out_len:
if (!quiet)
ubifs_err("bad node length %d", node_len);
out:
if (!quiet) {
ubifs_err("bad node at LEB %d:%d", lnum, offs);
dbg_dump_node(c, buf);
dbg_dump_stack();
}
return err;
}
/**
* ubifs_pad - pad flash space.
* @c: UBIFS file-system description object
* @buf: buffer to put padding to
* @pad: how many bytes to pad
*
* The flash media obliges us to write only in chunks of %c->min_io_size and
* when we have to write less data we add padding node to the write-buffer and
* pad it to the next minimal I/O unit's boundary. Padding nodes help when the
* media is being scanned. If the amount of wasted space is not enough to fit a
* padding node which takes %UBIFS_PAD_NODE_SZ bytes, we write padding bytes
* pattern (%UBIFS_PADDING_BYTE).
*
* Padding nodes are also used to fill gaps when the "commit-in-gaps" method is
* used.
*/
void ubifs_pad(const struct ubifs_info *c, void *buf, int pad)
{
uint32_t crc;
ubifs_assert(pad >= 0 && !(pad & 7));
if (pad >= UBIFS_PAD_NODE_SZ) {
struct ubifs_ch *ch = buf;
struct ubifs_pad_node *pad_node = buf;
ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC);
ch->node_type = UBIFS_PAD_NODE;
ch->group_type = UBIFS_NO_NODE_GROUP;
ch->padding[0] = ch->padding[1] = 0;
ch->sqnum = 0;
ch->len = cpu_to_le32(UBIFS_PAD_NODE_SZ);
pad -= UBIFS_PAD_NODE_SZ;
pad_node->pad_len = cpu_to_le32(pad);
crc = crc32(UBIFS_CRC32_INIT, buf + 8, UBIFS_PAD_NODE_SZ - 8);
ch->crc = cpu_to_le32(crc);
memset(buf + UBIFS_PAD_NODE_SZ, 0, pad);
} else if (pad > 0)
/* Too little space, padding node won't fit */
memset(buf, UBIFS_PADDING_BYTE, pad);
}
/**
* next_sqnum - get next sequence number.
* @c: UBIFS file-system description object
*/
static unsigned long long next_sqnum(struct ubifs_info *c)
{
unsigned long long sqnum;
spin_lock(&c->cnt_lock);
sqnum = ++c->max_sqnum;
spin_unlock(&c->cnt_lock);
if (unlikely(sqnum >= SQNUM_WARN_WATERMARK)) {
if (sqnum >= SQNUM_WATERMARK) {
ubifs_err("sequence number overflow %llu, end of life",
sqnum);
ubifs_ro_mode(c, -EINVAL);
}
ubifs_warn("running out of sequence numbers, end of life soon");
}
return sqnum;
}
/**
* ubifs_prepare_node - prepare node to be written to flash.
* @c: UBIFS file-system description object
* @node: the node to pad
* @len: node length
* @pad: if the buffer has to be padded
*
* This function prepares node at @node to be written to the media - it
* calculates node CRC, fills the common header, and adds proper padding up to
* the next minimum I/O unit if @pad is not zero.
*/
void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad)
{
uint32_t crc;
struct ubifs_ch *ch = node;
unsigned long long sqnum = next_sqnum(c);
ubifs_assert(len >= UBIFS_CH_SZ);
ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC);
ch->len = cpu_to_le32(len);
ch->group_type = UBIFS_NO_NODE_GROUP;
ch->sqnum = cpu_to_le64(sqnum);
ch->padding[0] = ch->padding[1] = 0;
crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8);
ch->crc = cpu_to_le32(crc);
if (pad) {
len = ALIGN(len, 8);
pad = ALIGN(len, c->min_io_size) - len;
ubifs_pad(c, node + len, pad);
}
}
/**
* ubifs_read_node - read node.
* @c: UBIFS file-system description object
* @buf: buffer to read to
* @type: node type
* @len: node length (not aligned)
* @lnum: logical eraseblock number
* @offs: offset within the logical eraseblock
*
* This function reads a node of known type and and length, checks it and
* stores in @buf. Returns zero in case of success, %-EUCLEAN if CRC mismatched
* and a negative error code in case of failure.
*/
int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
int lnum, int offs)
{
int err, l;
struct ubifs_ch *ch = buf;
dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
ubifs_assert(lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
ubifs_assert(len >= UBIFS_CH_SZ && offs + len <= c->leb_size);
ubifs_assert(!(offs & 7) && offs < c->leb_size);
ubifs_assert(type >= 0 && type < UBIFS_NODE_TYPES_CNT);
err = ubi_read(c->ubi, lnum, buf, offs, len);
if (err && err != -EBADMSG) {
ubifs_err("cannot read node %d from LEB %d:%d, error %d",
type, lnum, offs, err);
return err;
}
if (type != ch->node_type) {
ubifs_err("bad node type (%d but expected %d)",
ch->node_type, type);
goto out;
}
err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
if (err) {
ubifs_err("expected node type %d", type);
return err;
}
l = le32_to_cpu(ch->len);
if (l != len) {
ubifs_err("bad node length %d, expected %d", l, len);
goto out;
}
return 0;
out:
ubifs_err("bad node at LEB %d:%d", lnum, offs);
dbg_dump_node(c, buf);
dbg_dump_stack();
return -EINVAL;
}

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fs/ubifs/key.h
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/*
* This header contains various key-related definitions and helper function.
* UBIFS allows several key schemes, so we access key fields only via these
* helpers. At the moment only one key scheme is supported.
*
* Simple key scheme
* ~~~~~~~~~~~~~~~~~
*
* Keys are 64-bits long. First 32-bits are inode number (parent inode number
* in case of direntry key). Next 3 bits are node type. The last 29 bits are
* 4KiB offset in case of inode node, and direntry hash in case of a direntry
* node. We use "r5" hash borrowed from reiserfs.
*/
#ifndef __UBIFS_KEY_H__
#define __UBIFS_KEY_H__
/**
* key_mask_hash - mask a valid hash value.
* @val: value to be masked
*
* We use hash values as offset in directories, so values %0 and %1 are
* reserved for "." and "..". %2 is reserved for "end of readdir" marker. This
* function makes sure the reserved values are not used.
*/
static inline uint32_t key_mask_hash(uint32_t hash)
{
hash &= UBIFS_S_KEY_HASH_MASK;
if (unlikely(hash <= 2))
hash += 3;
return hash;
}
/**
* key_r5_hash - R5 hash function (borrowed from reiserfs).
* @s: direntry name
* @len: name length
*/
static inline uint32_t key_r5_hash(const char *s, int len)
{
uint32_t a = 0;
const signed char *str = (const signed char *)s;
while (*str) {
a += *str << 4;
a += *str >> 4;
a *= 11;
str++;
}
return key_mask_hash(a);
}
/**
* key_test_hash - testing hash function.
* @str: direntry name
* @len: name length
*/
static inline uint32_t key_test_hash(const char *str, int len)
{
uint32_t a = 0;
len = min_t(uint32_t, len, 4);
memcpy(&a, str, len);
return key_mask_hash(a);
}
/**
* ino_key_init - initialize inode key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: inode number
*/
static inline void ino_key_init(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum)
{
key->u32[0] = inum;
key->u32[1] = UBIFS_INO_KEY << UBIFS_S_KEY_BLOCK_BITS;
}
/**
* ino_key_init_flash - initialize on-flash inode key.
* @c: UBIFS file-system description object
* @k: key to initialize
* @inum: inode number
*/
static inline void ino_key_init_flash(const struct ubifs_info *c, void *k,
ino_t inum)
{
union ubifs_key *key = k;
key->j32[0] = cpu_to_le32(inum);
key->j32[1] = cpu_to_le32(UBIFS_INO_KEY << UBIFS_S_KEY_BLOCK_BITS);
memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
}
/**
* lowest_ino_key - get the lowest possible inode key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: inode number
*/
static inline void lowest_ino_key(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum)
{
key->u32[0] = inum;
key->u32[1] = 0;
}
/**
* highest_ino_key - get the highest possible inode key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: inode number
*/
static inline void highest_ino_key(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum)
{
key->u32[0] = inum;
key->u32[1] = 0xffffffff;
}
/**
* dent_key_init - initialize directory entry key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: parent inode number
* @nm: direntry name and length
*/
static inline void dent_key_init(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum,
const struct qstr *nm)
{
uint32_t hash = c->key_hash(nm->name, nm->len);
ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
key->u32[0] = inum;
key->u32[1] = hash | (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS);
}
/**
* dent_key_init_hash - initialize directory entry key without re-calculating
* hash function.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: parent inode number
* @hash: direntry name hash
*/
static inline void dent_key_init_hash(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum,
uint32_t hash)
{
ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
key->u32[0] = inum;
key->u32[1] = hash | (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS);
}
/**
* dent_key_init_flash - initialize on-flash directory entry key.
* @c: UBIFS file-system description object
* @k: key to initialize
* @inum: parent inode number
* @nm: direntry name and length
*/
static inline void dent_key_init_flash(const struct ubifs_info *c, void *k,
ino_t inum, const struct qstr *nm)
{
union ubifs_key *key = k;
uint32_t hash = c->key_hash(nm->name, nm->len);
ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
key->j32[0] = cpu_to_le32(inum);
key->j32[1] = cpu_to_le32(hash |
(UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS));
memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
}
/**
* lowest_dent_key - get the lowest possible directory entry key.
* @c: UBIFS file-system description object
* @key: where to store the lowest key
* @inum: parent inode number
*/
static inline void lowest_dent_key(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum)
{
key->u32[0] = inum;
key->u32[1] = UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS;
}
/**
* xent_key_init - initialize extended attribute entry key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: host inode number
* @nm: extended attribute entry name and length
*/
static inline void xent_key_init(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum,
const struct qstr *nm)
{
uint32_t hash = c->key_hash(nm->name, nm->len);
ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
key->u32[0] = inum;
key->u32[1] = hash | (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS);
}
/**
* xent_key_init_hash - initialize extended attribute entry key without
* re-calculating hash function.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: host inode number
* @hash: extended attribute entry name hash
*/
static inline void xent_key_init_hash(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum,
uint32_t hash)
{
ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
key->u32[0] = inum;
key->u32[1] = hash | (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS);
}
/**
* xent_key_init_flash - initialize on-flash extended attribute entry key.
* @c: UBIFS file-system description object
* @k: key to initialize
* @inum: host inode number
* @nm: extended attribute entry name and length
*/
static inline void xent_key_init_flash(const struct ubifs_info *c, void *k,
ino_t inum, const struct qstr *nm)
{
union ubifs_key *key = k;
uint32_t hash = c->key_hash(nm->name, nm->len);
ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
key->j32[0] = cpu_to_le32(inum);
key->j32[1] = cpu_to_le32(hash |
(UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS));
memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
}
/**
* lowest_xent_key - get the lowest possible extended attribute entry key.
* @c: UBIFS file-system description object
* @key: where to store the lowest key
* @inum: host inode number
*/
static inline void lowest_xent_key(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum)
{
key->u32[0] = inum;
key->u32[1] = UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS;
}
/**
* data_key_init - initialize data key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: inode number
* @block: block number
*/
static inline void data_key_init(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum,
unsigned int block)
{
ubifs_assert(!(block & ~UBIFS_S_KEY_BLOCK_MASK));
key->u32[0] = inum;
key->u32[1] = block | (UBIFS_DATA_KEY << UBIFS_S_KEY_BLOCK_BITS);
}
/**
* data_key_init_flash - initialize on-flash data key.
* @c: UBIFS file-system description object
* @k: key to initialize
* @inum: inode number
* @block: block number
*/
static inline void data_key_init_flash(const struct ubifs_info *c, void *k,
ino_t inum, unsigned int block)
{
union ubifs_key *key = k;
ubifs_assert(!(block & ~UBIFS_S_KEY_BLOCK_MASK));
key->j32[0] = cpu_to_le32(inum);
key->j32[1] = cpu_to_le32(block |
(UBIFS_DATA_KEY << UBIFS_S_KEY_BLOCK_BITS));
memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
}
/**
* trun_key_init - initialize truncation node key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: inode number
*
* Note, UBIFS does not have truncation keys on the media and this function is
* only used for purposes of replay.
*/
static inline void trun_key_init(const struct ubifs_info *c,
union ubifs_key *key, ino_t inum)
{
key->u32[0] = inum;
key->u32[1] = UBIFS_TRUN_KEY << UBIFS_S_KEY_BLOCK_BITS;
}
/**
* key_type - get key type.
* @c: UBIFS file-system description object
* @key: key to get type of
*/
static inline int key_type(const struct ubifs_info *c,
const union ubifs_key *key)
{
return key->u32[1] >> UBIFS_S_KEY_BLOCK_BITS;
}
/**
* key_type_flash - get type of a on-flash formatted key.
* @c: UBIFS file-system description object
* @k: key to get type of
*/
static inline int key_type_flash(const struct ubifs_info *c, const void *k)
{
const union ubifs_key *key = k;
return le32_to_cpu(key->j32[1]) >> UBIFS_S_KEY_BLOCK_BITS;
}
/**
* key_inum - fetch inode number from key.
* @c: UBIFS file-system description object
* @k: key to fetch inode number from
*/
static inline ino_t key_inum(const struct ubifs_info *c, const void *k)
{
const union ubifs_key *key = k;
return key->u32[0];
}
/**
* key_inum_flash - fetch inode number from an on-flash formatted key.
* @c: UBIFS file-system description object
* @k: key to fetch inode number from
*/
static inline ino_t key_inum_flash(const struct ubifs_info *c, const void *k)
{
const union ubifs_key *key = k;
return le32_to_cpu(key->j32[0]);
}
/**
* key_hash - get directory entry hash.
* @c: UBIFS file-system description object
* @key: the key to get hash from
*/
static inline int key_hash(const struct ubifs_info *c,
const union ubifs_key *key)
{
return key->u32[1] & UBIFS_S_KEY_HASH_MASK;
}
/**
* key_hash_flash - get directory entry hash from an on-flash formatted key.
* @c: UBIFS file-system description object
* @k: the key to get hash from
*/
static inline int key_hash_flash(const struct ubifs_info *c, const void *k)
{
const union ubifs_key *key = k;
return le32_to_cpu(key->j32[1]) & UBIFS_S_KEY_HASH_MASK;
}
/**
* key_block - get data block number.
* @c: UBIFS file-system description object
* @key: the key to get the block number from
*/
static inline unsigned int key_block(const struct ubifs_info *c,
const union ubifs_key *key)
{
return key->u32[1] & UBIFS_S_KEY_BLOCK_MASK;
}
/**
* key_block_flash - get data block number from an on-flash formatted key.
* @c: UBIFS file-system description object
* @k: the key to get the block number from
*/
static inline unsigned int key_block_flash(const struct ubifs_info *c,
const void *k)
{
const union ubifs_key *key = k;
return le32_to_cpu(key->j32[1]) & UBIFS_S_KEY_BLOCK_MASK;
}
/**
* key_read - transform a key to in-memory format.
* @c: UBIFS file-system description object
* @from: the key to transform
* @to: the key to store the result
*/
static inline void key_read(const struct ubifs_info *c, const void *from,
union ubifs_key *to)
{
const union ubifs_key *f = from;
to->u32[0] = le32_to_cpu(f->j32[0]);
to->u32[1] = le32_to_cpu(f->j32[1]);
}
/**
* key_write - transform a key from in-memory format.
* @c: UBIFS file-system description object
* @from: the key to transform
* @to: the key to store the result
*/
static inline void key_write(const struct ubifs_info *c,
const union ubifs_key *from, void *to)
{
union ubifs_key *t = to;
t->j32[0] = cpu_to_le32(from->u32[0]);
t->j32[1] = cpu_to_le32(from->u32[1]);
memset(to + 8, 0, UBIFS_MAX_KEY_LEN - 8);
}
/**
* key_write_idx - transform a key from in-memory format for the index.
* @c: UBIFS file-system description object
* @from: the key to transform
* @to: the key to store the result
*/
static inline void key_write_idx(const struct ubifs_info *c,
const union ubifs_key *from, void *to)
{
union ubifs_key *t = to;
t->j32[0] = cpu_to_le32(from->u32[0]);
t->j32[1] = cpu_to_le32(from->u32[1]);
}
/**
* key_copy - copy a key.
* @c: UBIFS file-system description object
* @from: the key to copy from
* @to: the key to copy to
*/
static inline void key_copy(const struct ubifs_info *c,
const union ubifs_key *from, union ubifs_key *to)
{
to->u64[0] = from->u64[0];
}
/**
* keys_cmp - compare keys.
* @c: UBIFS file-system description object
* @key1: the first key to compare
* @key2: the second key to compare
*
* This function compares 2 keys and returns %-1 if @key1 is less than
* @key2, %0 if the keys are equivalent and %1 if @key1 is greater than @key2.
*/
static inline int keys_cmp(const struct ubifs_info *c,
const union ubifs_key *key1,
const union ubifs_key *key2)
{
if (key1->u32[0] < key2->u32[0])
return -1;
if (key1->u32[0] > key2->u32[0])
return 1;
if (key1->u32[1] < key2->u32[1])
return -1;
if (key1->u32[1] > key2->u32[1])
return 1;
return 0;
}
/**
* keys_eq - determine if keys are equivalent.
* @c: UBIFS file-system description object
* @key1: the first key to compare
* @key2: the second key to compare
*
* This function compares 2 keys and returns %1 if @key1 is equal to @key2 and
* %0 if not.
*/
static inline int keys_eq(const struct ubifs_info *c,
const union ubifs_key *key1,
const union ubifs_key *key2)
{
if (key1->u32[0] != key2->u32[0])
return 0;
if (key1->u32[1] != key2->u32[1])
return 0;
return 1;
}
/**
* is_hash_key - is a key vulnerable to hash collisions.
* @c: UBIFS file-system description object
* @key: key
*
* This function returns %1 if @key is a hashed key or %0 otherwise.
*/
static inline int is_hash_key(const struct ubifs_info *c,
const union ubifs_key *key)
{
int type = key_type(c, key);
return type == UBIFS_DENT_KEY || type == UBIFS_XENT_KEY;
}
/**
* key_max_inode_size - get maximum file size allowed by current key format.
* @c: UBIFS file-system description object
*/
static inline unsigned long long key_max_inode_size(const struct ubifs_info *c)
{
switch (c->key_fmt) {
case UBIFS_SIMPLE_KEY_FMT:
return (1ULL << UBIFS_S_KEY_BLOCK_BITS) * UBIFS_BLOCK_SIZE;
default:
return 0;
}
}
#endif /* !__UBIFS_KEY_H__ */

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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/*
* This file is a part of UBIFS journal implementation and contains various
* functions which manipulate the log. The log is a fixed area on the flash
* which does not contain any data but refers to buds. The log is a part of the
* journal.
*/
#include "ubifs.h"
/**
* ubifs_search_bud - search bud LEB.
* @c: UBIFS file-system description object
* @lnum: logical eraseblock number to search
*
* This function searches bud LEB @lnum. Returns bud description object in case
* of success and %NULL if there is no bud with this LEB number.
*/
struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum)
{
struct rb_node *p;
struct ubifs_bud *bud;
spin_lock(&c->buds_lock);
p = c->buds.rb_node;
while (p) {
bud = rb_entry(p, struct ubifs_bud, rb);
if (lnum < bud->lnum)
p = p->rb_left;
else if (lnum > bud->lnum)
p = p->rb_right;
else {
spin_unlock(&c->buds_lock);
return bud;
}
}
spin_unlock(&c->buds_lock);
return NULL;
}
/**
* ubifs_add_bud - add bud LEB to the tree of buds and its journal head list.
* @c: UBIFS file-system description object
* @bud: the bud to add
*/
void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud)
{
struct rb_node **p, *parent = NULL;
struct ubifs_bud *b;
struct ubifs_jhead *jhead;
spin_lock(&c->buds_lock);
p = &c->buds.rb_node;
while (*p) {
parent = *p;
b = rb_entry(parent, struct ubifs_bud, rb);
ubifs_assert(bud->lnum != b->lnum);
if (bud->lnum < b->lnum)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&bud->rb, parent, p);
rb_insert_color(&bud->rb, &c->buds);
if (c->jheads) {
jhead = &c->jheads[bud->jhead];
list_add_tail(&bud->list, &jhead->buds_list);
} else
ubifs_assert(c->replaying && (c->vfs_sb->s_flags & MS_RDONLY));
/*
* Note, although this is a new bud, we anyway account this space now,
* before any data has been written to it, because this is about to
* guarantee fixed mount time, and this bud will anyway be read and
* scanned.
*/
c->bud_bytes += c->leb_size - bud->start;
dbg_log("LEB %d:%d, jhead %d, bud_bytes %lld", bud->lnum,
bud->start, bud->jhead, c->bud_bytes);
spin_unlock(&c->buds_lock);
}

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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
/*
* This file implements the functions that access LEB properties and their
* categories. LEBs are categorized based on the needs of UBIFS, and the
* categories are stored as either heaps or lists to provide a fast way of
* finding a LEB in a particular category. For example, UBIFS may need to find
* an empty LEB for the journal, or a very dirty LEB for garbage collection.
*/
#include "ubifs.h"
/**
* get_heap_comp_val - get the LEB properties value for heap comparisons.
* @lprops: LEB properties
* @cat: LEB category
*/
static int get_heap_comp_val(struct ubifs_lprops *lprops, int cat)
{
switch (cat) {
case LPROPS_FREE:
return lprops->free;
case LPROPS_DIRTY_IDX:
return lprops->free + lprops->dirty;
default:
return lprops->dirty;
}
}
/**
* move_up_lpt_heap - move a new heap entry up as far as possible.
* @c: UBIFS file-system description object
* @heap: LEB category heap
* @lprops: LEB properties to move
* @cat: LEB category
*
* New entries to a heap are added at the bottom and then moved up until the
* parent's value is greater. In the case of LPT's category heaps, the value
* is either the amount of free space or the amount of dirty space, depending
* on the category.
*/
static void move_up_lpt_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
struct ubifs_lprops *lprops, int cat)
{
int val1, val2, hpos;
hpos = lprops->hpos;
if (!hpos)
return; /* Already top of the heap */
val1 = get_heap_comp_val(lprops, cat);
/* Compare to parent and, if greater, move up the heap */
do {
int ppos = (hpos - 1) / 2;
val2 = get_heap_comp_val(heap->arr[ppos], cat);
if (val2 >= val1)
return;
/* Greater than parent so move up */
heap->arr[ppos]->hpos = hpos;
heap->arr[hpos] = heap->arr[ppos];
heap->arr[ppos] = lprops;
lprops->hpos = ppos;
hpos = ppos;
} while (hpos);
}
/**
* adjust_lpt_heap - move a changed heap entry up or down the heap.
* @c: UBIFS file-system description object
* @heap: LEB category heap
* @lprops: LEB properties to move
* @hpos: heap position of @lprops
* @cat: LEB category
*
* Changed entries in a heap are moved up or down until the parent's value is
* greater. In the case of LPT's category heaps, the value is either the amount
* of free space or the amount of dirty space, depending on the category.
*/
static void adjust_lpt_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
struct ubifs_lprops *lprops, int hpos, int cat)
{
int val1, val2, val3, cpos;
val1 = get_heap_comp_val(lprops, cat);
/* Compare to parent and, if greater than parent, move up the heap */
if (hpos) {
int ppos = (hpos - 1) / 2;
val2 = get_heap_comp_val(heap->arr[ppos], cat);
if (val1 > val2) {
/* Greater than parent so move up */
while (1) {
heap->arr[ppos]->hpos = hpos;
heap->arr[hpos] = heap->arr[ppos];
heap->arr[ppos] = lprops;
lprops->hpos = ppos;
hpos = ppos;
if (!hpos)
return;
ppos = (hpos - 1) / 2;
val2 = get_heap_comp_val(heap->arr[ppos], cat);
if (val1 <= val2)
return;
/* Still greater than parent so keep going */
}
}
}
/* Not greater than parent, so compare to children */
while (1) {
/* Compare to left child */
cpos = hpos * 2 + 1;
if (cpos >= heap->cnt)
return;
val2 = get_heap_comp_val(heap->arr[cpos], cat);
if (val1 < val2) {
/* Less than left child, so promote biggest child */
if (cpos + 1 < heap->cnt) {
val3 = get_heap_comp_val(heap->arr[cpos + 1],
cat);
if (val3 > val2)
cpos += 1; /* Right child is bigger */
}
heap->arr[cpos]->hpos = hpos;
heap->arr[hpos] = heap->arr[cpos];
heap->arr[cpos] = lprops;
lprops->hpos = cpos;
hpos = cpos;
continue;
}
/* Compare to right child */
cpos += 1;
if (cpos >= heap->cnt)
return;
val3 = get_heap_comp_val(heap->arr[cpos], cat);
if (val1 < val3) {
/* Less than right child, so promote right child */
heap->arr[cpos]->hpos = hpos;
heap->arr[hpos] = heap->arr[cpos];
heap->arr[cpos] = lprops;
lprops->hpos = cpos;
hpos = cpos;
continue;
}
return;
}
}
/**
* add_to_lpt_heap - add LEB properties to a LEB category heap.
* @c: UBIFS file-system description object
* @lprops: LEB properties to add
* @cat: LEB category
*
* This function returns %1 if @lprops is added to the heap for LEB category
* @cat, otherwise %0 is returned because the heap is full.
*/
static int add_to_lpt_heap(struct ubifs_info *c, struct ubifs_lprops *lprops,
int cat)
{
struct ubifs_lpt_heap *heap = &c->lpt_heap[cat - 1];
if (heap->cnt >= heap->max_cnt) {
const int b = LPT_HEAP_SZ / 2 - 1;
int cpos, val1, val2;
/* Compare to some other LEB on the bottom of heap */
/* Pick a position kind of randomly */
cpos = (((size_t)lprops >> 4) & b) + b;
ubifs_assert(cpos >= b);
ubifs_assert(cpos < LPT_HEAP_SZ);
ubifs_assert(cpos < heap->cnt);
val1 = get_heap_comp_val(lprops, cat);
val2 = get_heap_comp_val(heap->arr[cpos], cat);
if (val1 > val2) {
struct ubifs_lprops *lp;
lp = heap->arr[cpos];
lp->flags &= ~LPROPS_CAT_MASK;
lp->flags |= LPROPS_UNCAT;
list_add(&lp->list, &c->uncat_list);
lprops->hpos = cpos;
heap->arr[cpos] = lprops;
move_up_lpt_heap(c, heap, lprops, cat);
dbg_check_heap(c, heap, cat, lprops->hpos);
return 1; /* Added to heap */
}
dbg_check_heap(c, heap, cat, -1);
return 0; /* Not added to heap */
} else {
lprops->hpos = heap->cnt++;
heap->arr[lprops->hpos] = lprops;
move_up_lpt_heap(c, heap, lprops, cat);
dbg_check_heap(c, heap, cat, lprops->hpos);
return 1; /* Added to heap */
}
}
/**
* remove_from_lpt_heap - remove LEB properties from a LEB category heap.
* @c: UBIFS file-system description object
* @lprops: LEB properties to remove
* @cat: LEB category
*/
static void remove_from_lpt_heap(struct ubifs_info *c,
struct ubifs_lprops *lprops, int cat)
{
struct ubifs_lpt_heap *heap;
int hpos = lprops->hpos;
heap = &c->lpt_heap[cat - 1];
ubifs_assert(hpos >= 0 && hpos < heap->cnt);
ubifs_assert(heap->arr[hpos] == lprops);
heap->cnt -= 1;
if (hpos < heap->cnt) {
heap->arr[hpos] = heap->arr[heap->cnt];
heap->arr[hpos]->hpos = hpos;
adjust_lpt_heap(c, heap, heap->arr[hpos], hpos, cat);
}
dbg_check_heap(c, heap, cat, -1);
}
/**
* lpt_heap_replace - replace lprops in a category heap.
* @c: UBIFS file-system description object
* @old_lprops: LEB properties to replace
* @new_lprops: LEB properties with which to replace
* @cat: LEB category
*
* During commit it is sometimes necessary to copy a pnode (see dirty_cow_pnode)
* and the lprops that the pnode contains. When that happens, references in
* the category heaps to those lprops must be updated to point to the new
* lprops. This function does that.
*/
static void lpt_heap_replace(struct ubifs_info *c,
struct ubifs_lprops *old_lprops,
struct ubifs_lprops *new_lprops, int cat)
{
struct ubifs_lpt_heap *heap;
int hpos = new_lprops->hpos;
heap = &c->lpt_heap[cat - 1];
heap->arr[hpos] = new_lprops;
}
/**
* ubifs_add_to_cat - add LEB properties to a category list or heap.
* @c: UBIFS file-system description object
* @lprops: LEB properties to add
* @cat: LEB category to which to add
*
* LEB properties are categorized to enable fast find operations.
*/
void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
int cat)
{
switch (cat) {
case LPROPS_DIRTY:
case LPROPS_DIRTY_IDX:
case LPROPS_FREE:
if (add_to_lpt_heap(c, lprops, cat))
break;
/* No more room on heap so make it uncategorized */
cat = LPROPS_UNCAT;
/* Fall through */
case LPROPS_UNCAT:
list_add(&lprops->list, &c->uncat_list);
break;
case LPROPS_EMPTY:
list_add(&lprops->list, &c->empty_list);
break;
case LPROPS_FREEABLE:
list_add(&lprops->list, &c->freeable_list);
c->freeable_cnt += 1;
break;
case LPROPS_FRDI_IDX:
list_add(&lprops->list, &c->frdi_idx_list);
break;
default:
ubifs_assert(0);
}
lprops->flags &= ~LPROPS_CAT_MASK;
lprops->flags |= cat;
}
/**
* ubifs_remove_from_cat - remove LEB properties from a category list or heap.
* @c: UBIFS file-system description object
* @lprops: LEB properties to remove
* @cat: LEB category from which to remove
*
* LEB properties are categorized to enable fast find operations.
*/
static void ubifs_remove_from_cat(struct ubifs_info *c,
struct ubifs_lprops *lprops, int cat)
{
switch (cat) {
case LPROPS_DIRTY:
case LPROPS_DIRTY_IDX:
case LPROPS_FREE:
remove_from_lpt_heap(c, lprops, cat);
break;
case LPROPS_FREEABLE:
c->freeable_cnt -= 1;
ubifs_assert(c->freeable_cnt >= 0);
/* Fall through */
case LPROPS_UNCAT:
case LPROPS_EMPTY:
case LPROPS_FRDI_IDX:
ubifs_assert(!list_empty(&lprops->list));
list_del(&lprops->list);
break;
default:
ubifs_assert(0);
}
}
/**
* ubifs_replace_cat - replace lprops in a category list or heap.
* @c: UBIFS file-system description object
* @old_lprops: LEB properties to replace
* @new_lprops: LEB properties with which to replace
*
* During commit it is sometimes necessary to copy a pnode (see dirty_cow_pnode)
* and the lprops that the pnode contains. When that happens, references in
* category lists and heaps must be replaced. This function does that.
*/
void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,
struct ubifs_lprops *new_lprops)
{
int cat;
cat = new_lprops->flags & LPROPS_CAT_MASK;
switch (cat) {
case LPROPS_DIRTY:
case LPROPS_DIRTY_IDX:
case LPROPS_FREE:
lpt_heap_replace(c, old_lprops, new_lprops, cat);
break;
case LPROPS_UNCAT:
case LPROPS_EMPTY:
case LPROPS_FREEABLE:
case LPROPS_FRDI_IDX:
list_replace(&old_lprops->list, &new_lprops->list);
break;
default:
ubifs_assert(0);
}
}
/**
* ubifs_ensure_cat - ensure LEB properties are categorized.
* @c: UBIFS file-system description object
* @lprops: LEB properties
*
* A LEB may have fallen off of the bottom of a heap, and ended up as
* uncategorized even though it has enough space for us now. If that is the case
* this function will put the LEB back onto a heap.
*/
void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops)
{
int cat = lprops->flags & LPROPS_CAT_MASK;
if (cat != LPROPS_UNCAT)
return;
cat = ubifs_categorize_lprops(c, lprops);
if (cat == LPROPS_UNCAT)
return;
ubifs_remove_from_cat(c, lprops, LPROPS_UNCAT);
ubifs_add_to_cat(c, lprops, cat);
}
/**
* ubifs_categorize_lprops - categorize LEB properties.
* @c: UBIFS file-system description object
* @lprops: LEB properties to categorize
*
* LEB properties are categorized to enable fast find operations. This function
* returns the LEB category to which the LEB properties belong. Note however
* that if the LEB category is stored as a heap and the heap is full, the
* LEB properties may have their category changed to %LPROPS_UNCAT.
*/
int ubifs_categorize_lprops(const struct ubifs_info *c,
const struct ubifs_lprops *lprops)
{
if (lprops->flags & LPROPS_TAKEN)
return LPROPS_UNCAT;
if (lprops->free == c->leb_size) {
ubifs_assert(!(lprops->flags & LPROPS_INDEX));
return LPROPS_EMPTY;
}
if (lprops->free + lprops->dirty == c->leb_size) {
if (lprops->flags & LPROPS_INDEX)
return LPROPS_FRDI_IDX;
else
return LPROPS_FREEABLE;
}
if (lprops->flags & LPROPS_INDEX) {
if (lprops->dirty + lprops->free >= c->min_idx_node_sz)
return LPROPS_DIRTY_IDX;
} else {
if (lprops->dirty >= c->dead_wm &&
lprops->dirty > lprops->free)
return LPROPS_DIRTY;
if (lprops->free > 0)
return LPROPS_FREE;
}
return LPROPS_UNCAT;
}
/**
* change_category - change LEB properties category.
* @c: UBIFS file-system description object
* @lprops: LEB properties to recategorize
*
* LEB properties are categorized to enable fast find operations. When the LEB
* properties change they must be recategorized.
*/
static void change_category(struct ubifs_info *c, struct ubifs_lprops *lprops)
{
int old_cat = lprops->flags & LPROPS_CAT_MASK;
int new_cat = ubifs_categorize_lprops(c, lprops);
if (old_cat == new_cat) {
struct ubifs_lpt_heap *heap = &c->lpt_heap[new_cat - 1];
/* lprops on a heap now must be moved up or down */
if (new_cat < 1 || new_cat > LPROPS_HEAP_CNT)
return; /* Not on a heap */
heap = &c->lpt_heap[new_cat - 1];
adjust_lpt_heap(c, heap, lprops, lprops->hpos, new_cat);
} else {
ubifs_remove_from_cat(c, lprops, old_cat);
ubifs_add_to_cat(c, lprops, new_cat);
}
}
/**
* calc_dark - calculate LEB dark space size.
* @c: the UBIFS file-system description object
* @spc: amount of free and dirty space in the LEB
*
* This function calculates amount of dark space in an LEB which has @spc bytes
* of free and dirty space. Returns the calculations result.
*
* Dark space is the space which is not always usable - it depends on which
* nodes are written in which order. E.g., if an LEB has only 512 free bytes,
* it is dark space, because it cannot fit a large data node. So UBIFS cannot
* count on this LEB and treat these 512 bytes as usable because it is not true
* if, for example, only big chunks of uncompressible data will be written to
* the FS.
*/
static int calc_dark(struct ubifs_info *c, int spc)
{
ubifs_assert(!(spc & 7));
if (spc < c->dark_wm)
return spc;
/*
* If we have slightly more space then the dark space watermark, we can
* anyway safely assume it we'll be able to write a node of the
* smallest size there.
*/
if (spc - c->dark_wm < MIN_WRITE_SZ)
return spc - MIN_WRITE_SZ;
return c->dark_wm;
}
/**
* is_lprops_dirty - determine if LEB properties are dirty.
* @c: the UBIFS file-system description object
* @lprops: LEB properties to test
*/
static int is_lprops_dirty(struct ubifs_info *c, struct ubifs_lprops *lprops)
{
struct ubifs_pnode *pnode;
int pos;
pos = (lprops->lnum - c->main_first) & (UBIFS_LPT_FANOUT - 1);
pnode = (struct ubifs_pnode *)container_of(lprops - pos,
struct ubifs_pnode,
lprops[0]);
return !test_bit(COW_ZNODE, &pnode->flags) &&
test_bit(DIRTY_CNODE, &pnode->flags);
}
/**
* ubifs_change_lp - change LEB properties.
* @c: the UBIFS file-system description object
* @lp: LEB properties to change
* @free: new free space amount
* @dirty: new dirty space amount
* @flags: new flags
* @idx_gc_cnt: change to the count of idx_gc list
*
* This function changes LEB properties (@free, @dirty or @flag). However, the
* property which has the %LPROPS_NC value is not changed. Returns a pointer to
* the updated LEB properties on success and a negative error code on failure.
*
* Note, the LEB properties may have had to be copied (due to COW) and
* consequently the pointer returned may not be the same as the pointer
* passed.
*/
const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
const struct ubifs_lprops *lp,
int free, int dirty, int flags,
int idx_gc_cnt)
{
/*
* This is the only function that is allowed to change lprops, so we
* discard the const qualifier.
*/
struct ubifs_lprops *lprops = (struct ubifs_lprops *)lp;
dbg_lp("LEB %d, free %d, dirty %d, flags %d",
lprops->lnum, free, dirty, flags);
ubifs_assert(mutex_is_locked(&c->lp_mutex));
ubifs_assert(c->lst.empty_lebs >= 0 &&
c->lst.empty_lebs <= c->main_lebs);
ubifs_assert(c->freeable_cnt >= 0);
ubifs_assert(c->freeable_cnt <= c->main_lebs);
ubifs_assert(c->lst.taken_empty_lebs >= 0);
ubifs_assert(c->lst.taken_empty_lebs <= c->lst.empty_lebs);
ubifs_assert(!(c->lst.total_free & 7) && !(c->lst.total_dirty & 7));
ubifs_assert(!(c->lst.total_dead & 7) && !(c->lst.total_dark & 7));
ubifs_assert(!(c->lst.total_used & 7));
ubifs_assert(free == LPROPS_NC || free >= 0);
ubifs_assert(dirty == LPROPS_NC || dirty >= 0);
if (!is_lprops_dirty(c, lprops)) {
lprops = ubifs_lpt_lookup_dirty(c, lprops->lnum);
if (IS_ERR(lprops))
return lprops;
} else
ubifs_assert(lprops == ubifs_lpt_lookup_dirty(c, lprops->lnum));
ubifs_assert(!(lprops->free & 7) && !(lprops->dirty & 7));
spin_lock(&c->space_lock);
if ((lprops->flags & LPROPS_TAKEN) && lprops->free == c->leb_size)
c->lst.taken_empty_lebs -= 1;
if (!(lprops->flags & LPROPS_INDEX)) {
int old_spc;
old_spc = lprops->free + lprops->dirty;
if (old_spc < c->dead_wm)
c->lst.total_dead -= old_spc;
else
c->lst.total_dark -= calc_dark(c, old_spc);
c->lst.total_used -= c->leb_size - old_spc;
}
if (free != LPROPS_NC) {
free = ALIGN(free, 8);
c->lst.total_free += free - lprops->free;
/* Increase or decrease empty LEBs counter if needed */
if (free == c->leb_size) {
if (lprops->free != c->leb_size)
c->lst.empty_lebs += 1;
} else if (lprops->free == c->leb_size)
c->lst.empty_lebs -= 1;
lprops->free = free;
}
if (dirty != LPROPS_NC) {
dirty = ALIGN(dirty, 8);
c->lst.total_dirty += dirty - lprops->dirty;
lprops->dirty = dirty;
}
if (flags != LPROPS_NC) {
/* Take care about indexing LEBs counter if needed */
if ((lprops->flags & LPROPS_INDEX)) {
if (!(flags & LPROPS_INDEX))
c->lst.idx_lebs -= 1;
} else if (flags & LPROPS_INDEX)
c->lst.idx_lebs += 1;
lprops->flags = flags;
}
if (!(lprops->flags & LPROPS_INDEX)) {
int new_spc;
new_spc = lprops->free + lprops->dirty;
if (new_spc < c->dead_wm)
c->lst.total_dead += new_spc;
else
c->lst.total_dark += calc_dark(c, new_spc);
c->lst.total_used += c->leb_size - new_spc;
}
if ((lprops->flags & LPROPS_TAKEN) && lprops->free == c->leb_size)
c->lst.taken_empty_lebs += 1;
change_category(c, lprops);
c->idx_gc_cnt += idx_gc_cnt;
spin_unlock(&c->space_lock);
return lprops;
}
/**
* ubifs_get_lp_stats - get lprops statistics.
* @c: UBIFS file-system description object
* @st: return statistics
*/
void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst)
{
spin_lock(&c->space_lock);
memcpy(lst, &c->lst, sizeof(struct ubifs_lp_stats));
spin_unlock(&c->space_lock);
}
/**
* ubifs_change_one_lp - change LEB properties.
* @c: the UBIFS file-system description object
* @lnum: LEB to change properties for
* @free: amount of free space
* @dirty: amount of dirty space
* @flags_set: flags to set
* @flags_clean: flags to clean
* @idx_gc_cnt: change to the count of idx_gc list
*
* This function changes properties of LEB @lnum. It is a helper wrapper over
* 'ubifs_change_lp()' which hides lprops get/release. The arguments are the
* same as in case of 'ubifs_change_lp()'. Returns zero in case of success and
* a negative error code in case of failure.
*/
int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
int flags_set, int flags_clean, int idx_gc_cnt)
{
int err = 0, flags;
const struct ubifs_lprops *lp;
ubifs_get_lprops(c);
lp = ubifs_lpt_lookup_dirty(c, lnum);
if (IS_ERR(lp)) {
err = PTR_ERR(lp);
goto out;
}
flags = (lp->flags | flags_set) & ~flags_clean;
lp = ubifs_change_lp(c, lp, free, dirty, flags, idx_gc_cnt);
if (IS_ERR(lp))
err = PTR_ERR(lp);
out:
ubifs_release_lprops(c);
return err;
}
/**
* ubifs_update_one_lp - update LEB properties.
* @c: the UBIFS file-system description object
* @lnum: LEB to change properties for
* @free: amount of free space
* @dirty: amount of dirty space to add
* @flags_set: flags to set
* @flags_clean: flags to clean
*
* This function is the same as 'ubifs_change_one_lp()' but @dirty is added to
* current dirty space, not substitutes it.
*/
int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
int flags_set, int flags_clean)
{
int err = 0, flags;
const struct ubifs_lprops *lp;
ubifs_get_lprops(c);
lp = ubifs_lpt_lookup_dirty(c, lnum);
if (IS_ERR(lp)) {
err = PTR_ERR(lp);
goto out;
}
flags = (lp->flags | flags_set) & ~flags_clean;
lp = ubifs_change_lp(c, lp, free, lp->dirty + dirty, flags, 0);
if (IS_ERR(lp))
err = PTR_ERR(lp);
out:
ubifs_release_lprops(c);
return err;
}
/**
* ubifs_read_one_lp - read LEB properties.
* @c: the UBIFS file-system description object
* @lnum: LEB to read properties for
* @lp: where to store read properties
*
* This helper function reads properties of a LEB @lnum and stores them in @lp.
* Returns zero in case of success and a negative error code in case of
* failure.
*/
int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp)
{
int err = 0;
const struct ubifs_lprops *lpp;
ubifs_get_lprops(c);
lpp = ubifs_lpt_lookup(c, lnum);
if (IS_ERR(lpp)) {
err = PTR_ERR(lpp);
goto out;
}
memcpy(lp, lpp, sizeof(struct ubifs_lprops));
out:
ubifs_release_lprops(c);
return err;
}
/**
* ubifs_fast_find_free - try to find a LEB with free space quickly.
* @c: the UBIFS file-system description object
*
* This function returns LEB properties for a LEB with free space or %NULL if
* the function is unable to find a LEB quickly.
*/
const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c)
{
struct ubifs_lprops *lprops;
struct ubifs_lpt_heap *heap;
ubifs_assert(mutex_is_locked(&c->lp_mutex));
heap = &c->lpt_heap[LPROPS_FREE - 1];
if (heap->cnt == 0)
return NULL;
lprops = heap->arr[0];
ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
ubifs_assert(!(lprops->flags & LPROPS_INDEX));
return lprops;
}
/**
* ubifs_fast_find_empty - try to find an empty LEB quickly.
* @c: the UBIFS file-system description object
*
* This function returns LEB properties for an empty LEB or %NULL if the
* function is unable to find an empty LEB quickly.
*/
const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c)
{
struct ubifs_lprops *lprops;
ubifs_assert(mutex_is_locked(&c->lp_mutex));
if (list_empty(&c->empty_list))
return NULL;
lprops = list_entry(c->empty_list.next, struct ubifs_lprops, list);
ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
ubifs_assert(!(lprops->flags & LPROPS_INDEX));
ubifs_assert(lprops->free == c->leb_size);
return lprops;
}
/**
* ubifs_fast_find_freeable - try to find a freeable LEB quickly.
* @c: the UBIFS file-system description object
*
* This function returns LEB properties for a freeable LEB or %NULL if the
* function is unable to find a freeable LEB quickly.
*/
const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c)
{
struct ubifs_lprops *lprops;
ubifs_assert(mutex_is_locked(&c->lp_mutex));
if (list_empty(&c->freeable_list))
return NULL;
lprops = list_entry(c->freeable_list.next, struct ubifs_lprops, list);
ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
ubifs_assert(!(lprops->flags & LPROPS_INDEX));
ubifs_assert(lprops->free + lprops->dirty == c->leb_size);
ubifs_assert(c->freeable_cnt > 0);
return lprops;
}
/**
* ubifs_fast_find_frdi_idx - try to find a freeable index LEB quickly.
* @c: the UBIFS file-system description object
*
* This function returns LEB properties for a freeable index LEB or %NULL if the
* function is unable to find a freeable index LEB quickly.
*/
const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c)
{
struct ubifs_lprops *lprops;
ubifs_assert(mutex_is_locked(&c->lp_mutex));
if (list_empty(&c->frdi_idx_list))
return NULL;
lprops = list_entry(c->frdi_idx_list.next, struct ubifs_lprops, list);
ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
ubifs_assert((lprops->flags & LPROPS_INDEX));
ubifs_assert(lprops->free + lprops->dirty == c->leb_size);
return lprops;
}

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fs/ubifs/lpt.c
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fs/ubifs/lpt_commit.c
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
/*
* This file implements commit-related functionality of the LEB properties
* subsystem.
*/
#include "crc16.h"
#include "ubifs.h"
/**
* free_obsolete_cnodes - free obsolete cnodes for commit end.
* @c: UBIFS file-system description object
*/
static void free_obsolete_cnodes(struct ubifs_info *c)
{
struct ubifs_cnode *cnode, *cnext;
cnext = c->lpt_cnext;
if (!cnext)
return;
do {
cnode = cnext;
cnext = cnode->cnext;
if (test_bit(OBSOLETE_CNODE, &cnode->flags))
kfree(cnode);
else
cnode->cnext = NULL;
} while (cnext != c->lpt_cnext);
c->lpt_cnext = NULL;
}
/**
* first_nnode - find the first nnode in memory.
* @c: UBIFS file-system description object
* @hght: height of tree where nnode found is returned here
*
* This function returns a pointer to the nnode found or %NULL if no nnode is
* found. This function is a helper to 'ubifs_lpt_free()'.
*/
static struct ubifs_nnode *first_nnode(struct ubifs_info *c, int *hght)
{
struct ubifs_nnode *nnode;
int h, i, found;
nnode = c->nroot;
*hght = 0;
if (!nnode)
return NULL;
for (h = 1; h < c->lpt_hght; h++) {
found = 0;
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
if (nnode->nbranch[i].nnode) {
found = 1;
nnode = nnode->nbranch[i].nnode;
*hght = h;
break;
}
}
if (!found)
break;
}
return nnode;
}
/**
* next_nnode - find the next nnode in memory.
* @c: UBIFS file-system description object
* @nnode: nnode from which to start.
* @hght: height of tree where nnode is, is passed and returned here
*
* This function returns a pointer to the nnode found or %NULL if no nnode is
* found. This function is a helper to 'ubifs_lpt_free()'.
*/
static struct ubifs_nnode *next_nnode(struct ubifs_info *c,
struct ubifs_nnode *nnode, int *hght)
{
struct ubifs_nnode *parent;
int iip, h, i, found;
parent = nnode->parent;
if (!parent)
return NULL;
if (nnode->iip == UBIFS_LPT_FANOUT - 1) {
*hght -= 1;
return parent;
}
for (iip = nnode->iip + 1; iip < UBIFS_LPT_FANOUT; iip++) {
nnode = parent->nbranch[iip].nnode;
if (nnode)
break;
}
if (!nnode) {
*hght -= 1;
return parent;
}
for (h = *hght + 1; h < c->lpt_hght; h++) {
found = 0;
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
if (nnode->nbranch[i].nnode) {
found = 1;
nnode = nnode->nbranch[i].nnode;
*hght = h;
break;
}
}
if (!found)
break;
}
return nnode;
}
/**
* ubifs_lpt_free - free resources owned by the LPT.
* @c: UBIFS file-system description object
* @wr_only: free only resources used for writing
*/
void ubifs_lpt_free(struct ubifs_info *c, int wr_only)
{
struct ubifs_nnode *nnode;
int i, hght;
/* Free write-only things first */
free_obsolete_cnodes(c); /* Leftover from a failed commit */
vfree(c->ltab_cmt);
c->ltab_cmt = NULL;
vfree(c->lpt_buf);
c->lpt_buf = NULL;
kfree(c->lsave);
c->lsave = NULL;
if (wr_only)
return;
/* Now free the rest */
nnode = first_nnode(c, &hght);
while (nnode) {
for (i = 0; i < UBIFS_LPT_FANOUT; i++)
kfree(nnode->nbranch[i].nnode);
nnode = next_nnode(c, nnode, &hght);
}
for (i = 0; i < LPROPS_HEAP_CNT; i++)
kfree(c->lpt_heap[i].arr);
kfree(c->dirty_idx.arr);
kfree(c->nroot);
vfree(c->ltab);
kfree(c->lpt_nod_buf);
}

341
fs/ubifs/master.c
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/* This file implements reading and writing the master node */
#include "ubifs.h"
/**
* scan_for_master - search the valid master node.
* @c: UBIFS file-system description object
*
* This function scans the master node LEBs and search for the latest master
* node. Returns zero in case of success and a negative error code in case of
* failure.
*/
static int scan_for_master(struct ubifs_info *c)
{
struct ubifs_scan_leb *sleb;
struct ubifs_scan_node *snod;
int lnum, offs = 0, nodes_cnt;
lnum = UBIFS_MST_LNUM;
sleb = ubifs_scan(c, lnum, 0, c->sbuf);
if (IS_ERR(sleb))
return PTR_ERR(sleb);
nodes_cnt = sleb->nodes_cnt;
if (nodes_cnt > 0) {
snod = list_entry(sleb->nodes.prev, struct ubifs_scan_node,
list);
if (snod->type != UBIFS_MST_NODE)
goto out;
memcpy(c->mst_node, snod->node, snod->len);
offs = snod->offs;
}
ubifs_scan_destroy(sleb);
lnum += 1;
sleb = ubifs_scan(c, lnum, 0, c->sbuf);
if (IS_ERR(sleb))
return PTR_ERR(sleb);
if (sleb->nodes_cnt != nodes_cnt)
goto out;
if (!sleb->nodes_cnt)
goto out;
snod = list_entry(sleb->nodes.prev, struct ubifs_scan_node, list);
if (snod->type != UBIFS_MST_NODE)
goto out;
if (snod->offs != offs)
goto out;
if (memcmp((void *)c->mst_node + UBIFS_CH_SZ,
(void *)snod->node + UBIFS_CH_SZ,
UBIFS_MST_NODE_SZ - UBIFS_CH_SZ))
goto out;
c->mst_offs = offs;
ubifs_scan_destroy(sleb);
return 0;
out:
ubifs_scan_destroy(sleb);
return -EINVAL;
}
/**
* validate_master - validate master node.
* @c: UBIFS file-system description object
*
* This function validates data which was read from master node. Returns zero
* if the data is all right and %-EINVAL if not.
*/
static int validate_master(const struct ubifs_info *c)
{
long long main_sz;
int err;
if (c->max_sqnum >= SQNUM_WATERMARK) {
err = 1;
goto out;
}
if (c->cmt_no >= c->max_sqnum) {
err = 2;
goto out;
}
if (c->highest_inum >= INUM_WATERMARK) {
err = 3;
goto out;
}
if (c->lhead_lnum < UBIFS_LOG_LNUM ||
c->lhead_lnum >= UBIFS_LOG_LNUM + c->log_lebs ||
c->lhead_offs < 0 || c->lhead_offs >= c->leb_size ||
c->lhead_offs & (c->min_io_size - 1)) {
err = 4;
goto out;
}
if (c->zroot.lnum >= c->leb_cnt || c->zroot.lnum < c->main_first ||
c->zroot.offs >= c->leb_size || c->zroot.offs & 7) {
err = 5;
goto out;
}
if (c->zroot.len < c->ranges[UBIFS_IDX_NODE].min_len ||
c->zroot.len > c->ranges[UBIFS_IDX_NODE].max_len) {
err = 6;
goto out;
}
if (c->gc_lnum >= c->leb_cnt || c->gc_lnum < c->main_first) {
err = 7;
goto out;
}
if (c->ihead_lnum >= c->leb_cnt || c->ihead_lnum < c->main_first ||
c->ihead_offs % c->min_io_size || c->ihead_offs < 0 ||
c->ihead_offs > c->leb_size || c->ihead_offs & 7) {
err = 8;
goto out;
}
main_sz = (long long)c->main_lebs * c->leb_size;
if (c->old_idx_sz & 7 || c->old_idx_sz >= main_sz) {
err = 9;
goto out;
}
if (c->lpt_lnum < c->lpt_first || c->lpt_lnum > c->lpt_last ||
c->lpt_offs < 0 || c->lpt_offs + c->nnode_sz > c->leb_size) {
err = 10;
goto out;
}
if (c->nhead_lnum < c->lpt_first || c->nhead_lnum > c->lpt_last ||
c->nhead_offs < 0 || c->nhead_offs % c->min_io_size ||
c->nhead_offs > c->leb_size) {
err = 11;
goto out;
}
if (c->ltab_lnum < c->lpt_first || c->ltab_lnum > c->lpt_last ||
c->ltab_offs < 0 ||
c->ltab_offs + c->ltab_sz > c->leb_size) {
err = 12;
goto out;
}
if (c->big_lpt && (c->lsave_lnum < c->lpt_first ||
c->lsave_lnum > c->lpt_last || c->lsave_offs < 0 ||
c->lsave_offs + c->lsave_sz > c->leb_size)) {
err = 13;
goto out;
}
if (c->lscan_lnum < c->main_first || c->lscan_lnum >= c->leb_cnt) {
err = 14;
goto out;
}
if (c->lst.empty_lebs < 0 || c->lst.empty_lebs > c->main_lebs - 2) {
err = 15;
goto out;
}
if (c->lst.idx_lebs < 0 || c->lst.idx_lebs > c->main_lebs - 1) {
err = 16;
goto out;
}
if (c->lst.total_free < 0 || c->lst.total_free > main_sz ||
c->lst.total_free & 7) {
err = 17;
goto out;
}
if (c->lst.total_dirty < 0 || (c->lst.total_dirty & 7)) {
err = 18;
goto out;
}
if (c->lst.total_used < 0 || (c->lst.total_used & 7)) {
err = 19;
goto out;
}
if (c->lst.total_free + c->lst.total_dirty +
c->lst.total_used > main_sz) {
err = 20;
goto out;
}
if (c->lst.total_dead + c->lst.total_dark +
c->lst.total_used + c->old_idx_sz > main_sz) {
err = 21;
goto out;
}
if (c->lst.total_dead < 0 ||
c->lst.total_dead > c->lst.total_free + c->lst.total_dirty ||
c->lst.total_dead & 7) {
err = 22;
goto out;
}
if (c->lst.total_dark < 0 ||
c->lst.total_dark > c->lst.total_free + c->lst.total_dirty ||
c->lst.total_dark & 7) {
err = 23;
goto out;
}
return 0;
out:
ubifs_err("bad master node at offset %d error %d", c->mst_offs, err);
dbg_dump_node(c, c->mst_node);
return -EINVAL;
}
/**
* ubifs_read_master - read master node.
* @c: UBIFS file-system description object
*
* This function finds and reads the master node during file-system mount. If
* the flash is empty, it creates default master node as well. Returns zero in
* case of success and a negative error code in case of failure.
*/
int ubifs_read_master(struct ubifs_info *c)
{
int err, old_leb_cnt;
c->mst_node = kzalloc(c->mst_node_alsz, GFP_KERNEL);
if (!c->mst_node)
return -ENOMEM;
err = scan_for_master(c);
if (err) {
err = ubifs_recover_master_node(c);
if (err)
/*
* Note, we do not free 'c->mst_node' here because the
* unmount routine will take care of this.
*/
return err;
}
/* Make sure that the recovery flag is clear */
c->mst_node->flags &= cpu_to_le32(~UBIFS_MST_RCVRY);
c->max_sqnum = le64_to_cpu(c->mst_node->ch.sqnum);
c->highest_inum = le64_to_cpu(c->mst_node->highest_inum);
c->cmt_no = le64_to_cpu(c->mst_node->cmt_no);
c->zroot.lnum = le32_to_cpu(c->mst_node->root_lnum);
c->zroot.offs = le32_to_cpu(c->mst_node->root_offs);
c->zroot.len = le32_to_cpu(c->mst_node->root_len);
c->lhead_lnum = le32_to_cpu(c->mst_node->log_lnum);
c->gc_lnum = le32_to_cpu(c->mst_node->gc_lnum);
c->ihead_lnum = le32_to_cpu(c->mst_node->ihead_lnum);
c->ihead_offs = le32_to_cpu(c->mst_node->ihead_offs);
c->old_idx_sz = le64_to_cpu(c->mst_node->index_size);
c->lpt_lnum = le32_to_cpu(c->mst_node->lpt_lnum);
c->lpt_offs = le32_to_cpu(c->mst_node->lpt_offs);
c->nhead_lnum = le32_to_cpu(c->mst_node->nhead_lnum);
c->nhead_offs = le32_to_cpu(c->mst_node->nhead_offs);
c->ltab_lnum = le32_to_cpu(c->mst_node->ltab_lnum);
c->ltab_offs = le32_to_cpu(c->mst_node->ltab_offs);
c->lsave_lnum = le32_to_cpu(c->mst_node->lsave_lnum);
c->lsave_offs = le32_to_cpu(c->mst_node->lsave_offs);
c->lscan_lnum = le32_to_cpu(c->mst_node->lscan_lnum);
c->lst.empty_lebs = le32_to_cpu(c->mst_node->empty_lebs);
c->lst.idx_lebs = le32_to_cpu(c->mst_node->idx_lebs);
old_leb_cnt = le32_to_cpu(c->mst_node->leb_cnt);
c->lst.total_free = le64_to_cpu(c->mst_node->total_free);
c->lst.total_dirty = le64_to_cpu(c->mst_node->total_dirty);
c->lst.total_used = le64_to_cpu(c->mst_node->total_used);
c->lst.total_dead = le64_to_cpu(c->mst_node->total_dead);
c->lst.total_dark = le64_to_cpu(c->mst_node->total_dark);
c->calc_idx_sz = c->old_idx_sz;
if (c->mst_node->flags & cpu_to_le32(UBIFS_MST_NO_ORPHS))
c->no_orphs = 1;
if (old_leb_cnt != c->leb_cnt) {
/* The file system has been resized */
int growth = c->leb_cnt - old_leb_cnt;
if (c->leb_cnt < old_leb_cnt ||
c->leb_cnt < UBIFS_MIN_LEB_CNT) {
ubifs_err("bad leb_cnt on master node");
dbg_dump_node(c, c->mst_node);
return -EINVAL;
}
dbg_mnt("Auto resizing (master) from %d LEBs to %d LEBs",
old_leb_cnt, c->leb_cnt);
c->lst.empty_lebs += growth;
c->lst.total_free += growth * (long long)c->leb_size;
c->lst.total_dark += growth * (long long)c->dark_wm;
/*
* Reflect changes back onto the master node. N.B. the master
* node gets written immediately whenever mounting (or
* remounting) in read-write mode, so we do not need to write it
* here.
*/
c->mst_node->leb_cnt = cpu_to_le32(c->leb_cnt);
c->mst_node->empty_lebs = cpu_to_le32(c->lst.empty_lebs);
c->mst_node->total_free = cpu_to_le64(c->lst.total_free);
c->mst_node->total_dark = cpu_to_le64(c->lst.total_dark);
}
err = validate_master(c);
if (err)
return err;
err = dbg_old_index_check_init(c, &c->zroot);
return err;
}

310
fs/ubifs/misc.h
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/*
* This file contains miscellaneous helper functions.
*/
#ifndef __UBIFS_MISC_H__
#define __UBIFS_MISC_H__
/**
* ubifs_zn_dirty - check if znode is dirty.
* @znode: znode to check
*
* This helper function returns %1 if @znode is dirty and %0 otherwise.
*/
static inline int ubifs_zn_dirty(const struct ubifs_znode *znode)
{
return !!test_bit(DIRTY_ZNODE, &znode->flags);
}
/**
* ubifs_wake_up_bgt - wake up background thread.
* @c: UBIFS file-system description object
*/
static inline void ubifs_wake_up_bgt(struct ubifs_info *c)
{
if (c->bgt && !c->need_bgt) {
c->need_bgt = 1;
wake_up_process(c->bgt);
}
}
/**
* ubifs_tnc_find_child - find next child in znode.
* @znode: znode to search at
* @start: the zbranch index to start at
*
* This helper function looks for znode child starting at index @start. Returns
* the child or %NULL if no children were found.
*/
static inline struct ubifs_znode *
ubifs_tnc_find_child(struct ubifs_znode *znode, int start)
{
while (start < znode->child_cnt) {
if (znode->zbranch[start].znode)
return znode->zbranch[start].znode;
start += 1;
}
return NULL;
}
/**
* ubifs_inode - get UBIFS inode information by VFS 'struct inode' object.
* @inode: the VFS 'struct inode' pointer
*/
static inline struct ubifs_inode *ubifs_inode(const struct inode *inode)
{
return container_of(inode, struct ubifs_inode, vfs_inode);
}
/**
* ubifs_compr_present - check if compressor was compiled in.
* @compr_type: compressor type to check
*
* This function returns %1 of compressor of type @compr_type is present, and
* %0 if not.
*/
static inline int ubifs_compr_present(int compr_type)
{
ubifs_assert(compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
return !!ubifs_compressors[compr_type]->capi_name;
}
/**
* ubifs_compr_name - get compressor name string by its type.
* @compr_type: compressor type
*
* This function returns compressor type string.
*/
static inline const char *ubifs_compr_name(int compr_type)
{
ubifs_assert(compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
return ubifs_compressors[compr_type]->name;
}
/**
* ubifs_wbuf_sync - synchronize write-buffer.
* @wbuf: write-buffer to synchronize
*
* This is the same as as 'ubifs_wbuf_sync_nolock()' but it does not assume
* that the write-buffer is already locked.
*/
static inline int ubifs_wbuf_sync(struct ubifs_wbuf *wbuf)
{
int err;
mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
err = ubifs_wbuf_sync_nolock(wbuf);
mutex_unlock(&wbuf->io_mutex);
return err;
}
/**
* ubifs_leb_unmap - unmap an LEB.
* @c: UBIFS file-system description object
* @lnum: LEB number to unmap
*
* This function returns %0 on success and a negative error code on failure.
*/
static inline int ubifs_leb_unmap(const struct ubifs_info *c, int lnum)
{
int err;
if (c->ro_media)
return -EROFS;
err = ubi_leb_unmap(c->ubi, lnum);
if (err) {
ubifs_err("unmap LEB %d failed, error %d", lnum, err);
return err;
}
return 0;
}
/**
* ubifs_leb_write - write to a LEB.
* @c: UBIFS file-system description object
* @lnum: LEB number to write
* @buf: buffer to write from
* @offs: offset within LEB to write to
* @len: length to write
* @dtype: data type
*
* This function returns %0 on success and a negative error code on failure.
*/
static inline int ubifs_leb_write(const struct ubifs_info *c, int lnum,
const void *buf, int offs, int len, int dtype)
{
int err;
if (c->ro_media)
return -EROFS;
err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
if (err) {
ubifs_err("writing %d bytes at %d:%d, error %d",
len, lnum, offs, err);
return err;
}
return 0;
}
/**
* ubifs_leb_change - atomic LEB change.
* @c: UBIFS file-system description object
* @lnum: LEB number to write
* @buf: buffer to write from
* @len: length to write
* @dtype: data type
*
* This function returns %0 on success and a negative error code on failure.
*/
static inline int ubifs_leb_change(const struct ubifs_info *c, int lnum,
const void *buf, int len, int dtype)
{
int err;
if (c->ro_media)
return -EROFS;
err = ubi_leb_change(c->ubi, lnum, buf, len, dtype);
if (err) {
ubifs_err("changing %d bytes in LEB %d, error %d",
len, lnum, err);
return err;
}
return 0;
}
/**
* ubifs_add_dirt - add dirty space to LEB properties.
* @c: the UBIFS file-system description object
* @lnum: LEB to add dirty space for
* @dirty: dirty space to add
*
* This is a helper function which increased amount of dirty LEB space. Returns
* zero in case of success and a negative error code in case of failure.
*/
static inline int ubifs_add_dirt(struct ubifs_info *c, int lnum, int dirty)
{
return ubifs_update_one_lp(c, lnum, LPROPS_NC, dirty, 0, 0);
}
/**
* ubifs_return_leb - return LEB to lprops.
* @c: the UBIFS file-system description object
* @lnum: LEB to return
*
* This helper function cleans the "taken" flag of a logical eraseblock in the
* lprops. Returns zero in case of success and a negative error code in case of
* failure.
*/
static inline int ubifs_return_leb(struct ubifs_info *c, int lnum)
{
return ubifs_change_one_lp(c, lnum, LPROPS_NC, LPROPS_NC, 0,
LPROPS_TAKEN, 0);
}
/**
* ubifs_idx_node_sz - return index node size.
* @c: the UBIFS file-system description object
* @child_cnt: number of children of this index node
*/
static inline int ubifs_idx_node_sz(const struct ubifs_info *c, int child_cnt)
{
return UBIFS_IDX_NODE_SZ + (UBIFS_BRANCH_SZ + c->key_len) * child_cnt;
}
/**
* ubifs_idx_branch - return pointer to an index branch.
* @c: the UBIFS file-system description object
* @idx: index node
* @bnum: branch number
*/
static inline
struct ubifs_branch *ubifs_idx_branch(const struct ubifs_info *c,
const struct ubifs_idx_node *idx,
int bnum)
{
return (struct ubifs_branch *)((void *)idx->branches +
(UBIFS_BRANCH_SZ + c->key_len) * bnum);
}
/**
* ubifs_idx_key - return pointer to an index key.
* @c: the UBIFS file-system description object
* @idx: index node
*/
static inline void *ubifs_idx_key(const struct ubifs_info *c,
const struct ubifs_idx_node *idx)
{
return (void *)((struct ubifs_branch *)idx->branches)->key;
}
/**
* ubifs_tnc_lookup - look up a file-system node.
* @c: UBIFS file-system description object
* @key: node key to lookup
* @node: the node is returned here
*
* This function look up and reads node with key @key. The caller has to make
* sure the @node buffer is large enough to fit the node. Returns zero in case
* of success, %-ENOENT if the node was not found, and a negative error code in
* case of failure.
*/
static inline int ubifs_tnc_lookup(struct ubifs_info *c,
const union ubifs_key *key, void *node)
{
return ubifs_tnc_locate(c, key, node, NULL, NULL);
}
/**
* ubifs_get_lprops - get reference to LEB properties.
* @c: the UBIFS file-system description object
*
* This function locks lprops. Lprops have to be unlocked by
* 'ubifs_release_lprops()'.
*/
static inline void ubifs_get_lprops(struct ubifs_info *c)
{
mutex_lock(&c->lp_mutex);
}
/**
* ubifs_release_lprops - release lprops lock.
* @c: the UBIFS file-system description object
*
* This function has to be called after each 'ubifs_get_lprops()' call to
* unlock lprops.
*/
static inline void ubifs_release_lprops(struct ubifs_info *c)
{
ubifs_assert(mutex_is_locked(&c->lp_mutex));
ubifs_assert(c->lst.empty_lebs >= 0 &&
c->lst.empty_lebs <= c->main_lebs);
mutex_unlock(&c->lp_mutex);
}
#endif /* __UBIFS_MISC_H__ */

316
fs/ubifs/orphan.c
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author: Adrian Hunter
*/
#include "ubifs.h"
/*
* An orphan is an inode number whose inode node has been committed to the index
* with a link count of zero. That happens when an open file is deleted
* (unlinked) and then a commit is run. In the normal course of events the inode
* would be deleted when the file is closed. However in the case of an unclean
* unmount, orphans need to be accounted for. After an unclean unmount, the
* orphans' inodes must be deleted which means either scanning the entire index
* looking for them, or keeping a list on flash somewhere. This unit implements
* the latter approach.
*
* The orphan area is a fixed number of LEBs situated between the LPT area and
* the main area. The number of orphan area LEBs is specified when the file
* system is created. The minimum number is 1. The size of the orphan area
* should be so that it can hold the maximum number of orphans that are expected
* to ever exist at one time.
*
* The number of orphans that can fit in a LEB is:
*
* (c->leb_size - UBIFS_ORPH_NODE_SZ) / sizeof(__le64)
*
* For example: a 15872 byte LEB can fit 1980 orphans so 1 LEB may be enough.
*
* Orphans are accumulated in a rb-tree. When an inode's link count drops to
* zero, the inode number is added to the rb-tree. It is removed from the tree
* when the inode is deleted. Any new orphans that are in the orphan tree when
* the commit is run, are written to the orphan area in 1 or more orphan nodes.
* If the orphan area is full, it is consolidated to make space. There is
* always enough space because validation prevents the user from creating more
* than the maximum number of orphans allowed.
*/
/**
* tot_avail_orphs - calculate total space.
* @c: UBIFS file-system description object
*
* This function returns the number of orphans that can be written in half
* the total space. That leaves half the space for adding new orphans.
*/
static int tot_avail_orphs(struct ubifs_info *c)
{
int avail_lebs, avail;
avail_lebs = c->orph_lebs;
avail = avail_lebs *
((c->leb_size - UBIFS_ORPH_NODE_SZ) / sizeof(__le64));
return avail / 2;
}
/**
* ubifs_clear_orphans - erase all LEBs used for orphans.
* @c: UBIFS file-system description object
*
* If recovery is not required, then the orphans from the previous session
* are not needed. This function locates the LEBs used to record
* orphans, and un-maps them.
*/
int ubifs_clear_orphans(struct ubifs_info *c)
{
int lnum, err;
for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
err = ubifs_leb_unmap(c, lnum);
if (err)
return err;
}
c->ohead_lnum = c->orph_first;
c->ohead_offs = 0;
return 0;
}
/**
* insert_dead_orphan - insert an orphan.
* @c: UBIFS file-system description object
* @inum: orphan inode number
*
* This function is a helper to the 'do_kill_orphans()' function. The orphan
* must be kept until the next commit, so it is added to the rb-tree and the
* deletion list.
*/
static int insert_dead_orphan(struct ubifs_info *c, ino_t inum)
{
struct ubifs_orphan *orphan, *o;
struct rb_node **p, *parent = NULL;
orphan = kzalloc(sizeof(struct ubifs_orphan), GFP_KERNEL);
if (!orphan)
return -ENOMEM;
orphan->inum = inum;
p = &c->orph_tree.rb_node;
while (*p) {
parent = *p;
o = rb_entry(parent, struct ubifs_orphan, rb);
if (inum < o->inum)
p = &(*p)->rb_left;
else if (inum > o->inum)
p = &(*p)->rb_right;
else {
/* Already added - no problem */
kfree(orphan);
return 0;
}
}
c->tot_orphans += 1;
rb_link_node(&orphan->rb, parent, p);
rb_insert_color(&orphan->rb, &c->orph_tree);
list_add_tail(&orphan->list, &c->orph_list);
orphan->dnext = c->orph_dnext;
c->orph_dnext = orphan;
dbg_mnt("ino %lu, new %d, tot %d", (unsigned long)inum,
c->new_orphans, c->tot_orphans);
return 0;
}
/**
* do_kill_orphans - remove orphan inodes from the index.
* @c: UBIFS file-system description object
* @sleb: scanned LEB
* @last_cmt_no: cmt_no of last orphan node read is passed and returned here
* @outofdate: whether the LEB is out of date is returned here
* @last_flagged: whether the end orphan node is encountered
*
* This function is a helper to the 'kill_orphans()' function. It goes through
* every orphan node in a LEB and for every inode number recorded, removes
* all keys for that inode from the TNC.
*/
static int do_kill_orphans(struct ubifs_info *c, struct ubifs_scan_leb *sleb,
unsigned long long *last_cmt_no, int *outofdate,
int *last_flagged)
{
struct ubifs_scan_node *snod;
struct ubifs_orph_node *orph;
unsigned long long cmt_no;
ino_t inum;
int i, n, err, first = 1;
list_for_each_entry(snod, &sleb->nodes, list) {
if (snod->type != UBIFS_ORPH_NODE) {
ubifs_err("invalid node type %d in orphan area at "
"%d:%d", snod->type, sleb->lnum, snod->offs);
dbg_dump_node(c, snod->node);
return -EINVAL;
}
orph = snod->node;
/* Check commit number */
cmt_no = le64_to_cpu(orph->cmt_no) & LLONG_MAX;
/*
* The commit number on the master node may be less, because
* of a failed commit. If there are several failed commits in a
* row, the commit number written on orphan nodes will continue
* to increase (because the commit number is adjusted here) even
* though the commit number on the master node stays the same
* because the master node has not been re-written.
*/
if (cmt_no > c->cmt_no)
c->cmt_no = cmt_no;
if (cmt_no < *last_cmt_no && *last_flagged) {
/*
* The last orphan node had a higher commit number and
* was flagged as the last written for that commit
* number. That makes this orphan node, out of date.
*/
if (!first) {
ubifs_err("out of order commit number %llu in "
"orphan node at %d:%d",
cmt_no, sleb->lnum, snod->offs);
dbg_dump_node(c, snod->node);
return -EINVAL;
}
dbg_rcvry("out of date LEB %d", sleb->lnum);
*outofdate = 1;
return 0;
}
if (first)
first = 0;
n = (le32_to_cpu(orph->ch.len) - UBIFS_ORPH_NODE_SZ) >> 3;
for (i = 0; i < n; i++) {
inum = le64_to_cpu(orph->inos[i]);
dbg_rcvry("deleting orphaned inode %lu",
(unsigned long)inum);
err = ubifs_tnc_remove_ino(c, inum);
if (err)
return err;
err = insert_dead_orphan(c, inum);
if (err)
return err;
}
*last_cmt_no = cmt_no;
if (le64_to_cpu(orph->cmt_no) & (1ULL << 63)) {
dbg_rcvry("last orph node for commit %llu at %d:%d",
cmt_no, sleb->lnum, snod->offs);
*last_flagged = 1;
} else
*last_flagged = 0;
}
return 0;
}
/**
* kill_orphans - remove all orphan inodes from the index.
* @c: UBIFS file-system description object
*
* If recovery is required, then orphan inodes recorded during the previous
* session (which ended with an unclean unmount) must be deleted from the index.
* This is done by updating the TNC, but since the index is not updated until
* the next commit, the LEBs where the orphan information is recorded are not
* erased until the next commit.
*/
static int kill_orphans(struct ubifs_info *c)
{
unsigned long long last_cmt_no = 0;
int lnum, err = 0, outofdate = 0, last_flagged = 0;
c->ohead_lnum = c->orph_first;
c->ohead_offs = 0;
/* Check no-orphans flag and skip this if no orphans */
if (c->no_orphs) {
dbg_rcvry("no orphans");
return 0;
}
/*
* Orph nodes always start at c->orph_first and are written to each
* successive LEB in turn. Generally unused LEBs will have been unmapped
* but may contain out of date orphan nodes if the unmap didn't go
* through. In addition, the last orphan node written for each commit is
* marked (top bit of orph->cmt_no is set to 1). It is possible that
* there are orphan nodes from the next commit (i.e. the commit did not
* complete successfully). In that case, no orphans will have been lost
* due to the way that orphans are written, and any orphans added will
* be valid orphans anyway and so can be deleted.
*/
for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
struct ubifs_scan_leb *sleb;
dbg_rcvry("LEB %d", lnum);
sleb = ubifs_scan(c, lnum, 0, c->sbuf);
if (IS_ERR(sleb)) {
sleb = ubifs_recover_leb(c, lnum, 0, c->sbuf, 0);
if (IS_ERR(sleb)) {
err = PTR_ERR(sleb);
break;
}
}
err = do_kill_orphans(c, sleb, &last_cmt_no, &outofdate,
&last_flagged);
if (err || outofdate) {
ubifs_scan_destroy(sleb);
break;
}
if (sleb->endpt) {
c->ohead_lnum = lnum;
c->ohead_offs = sleb->endpt;
}
ubifs_scan_destroy(sleb);
}
return err;
}
/**
* ubifs_mount_orphans - delete orphan inodes and erase LEBs that recorded them.
* @c: UBIFS file-system description object
* @unclean: indicates recovery from unclean unmount
* @read_only: indicates read only mount
*
* This function is called when mounting to erase orphans from the previous
* session. If UBIFS was not unmounted cleanly, then the inodes recorded as
* orphans are deleted.
*/
int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only)
{
int err = 0;
c->max_orphans = tot_avail_orphs(c);
if (!read_only) {
c->orph_buf = vmalloc(c->leb_size);
if (!c->orph_buf)
return -ENOMEM;
}
if (unclean)
err = kill_orphans(c);
else if (!read_only)
err = ubifs_clear_orphans(c);
return err;
}

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fs/ubifs/recovery.c
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fs/ubifs/replay.c
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324
fs/ubifs/sb.c
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/*
* This file implements UBIFS superblock. The superblock is stored at the first
* LEB of the volume and is never changed by UBIFS. Only user-space tools may
* change it. The superblock node mostly contains geometry information.
*/
#include "ubifs.h"
/*
* Default journal size in logical eraseblocks as a percent of total
* flash size.
*/
#define DEFAULT_JNL_PERCENT 5
/* Default maximum journal size in bytes */
#define DEFAULT_MAX_JNL (32*1024*1024)
/* Default indexing tree fanout */
#define DEFAULT_FANOUT 8
/* Default number of data journal heads */
#define DEFAULT_JHEADS_CNT 1
/* Default positions of different LEBs in the main area */
#define DEFAULT_IDX_LEB 0
#define DEFAULT_DATA_LEB 1
#define DEFAULT_GC_LEB 2
/* Default number of LEB numbers in LPT's save table */
#define DEFAULT_LSAVE_CNT 256
/* Default reserved pool size as a percent of maximum free space */
#define DEFAULT_RP_PERCENT 5
/* The default maximum size of reserved pool in bytes */
#define DEFAULT_MAX_RP_SIZE (5*1024*1024)
/* Default time granularity in nanoseconds */
#define DEFAULT_TIME_GRAN 1000000000
/**
* validate_sb - validate superblock node.
* @c: UBIFS file-system description object
* @sup: superblock node
*
* This function validates superblock node @sup. Since most of data was read
* from the superblock and stored in @c, the function validates fields in @c
* instead. Returns zero in case of success and %-EINVAL in case of validation
* failure.
*/
static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
{
long long max_bytes;
int err = 1, min_leb_cnt;
if (!c->key_hash) {
err = 2;
goto failed;
}
if (sup->key_fmt != UBIFS_SIMPLE_KEY_FMT) {
err = 3;
goto failed;
}
if (le32_to_cpu(sup->min_io_size) != c->min_io_size) {
ubifs_err("min. I/O unit mismatch: %d in superblock, %d real",
le32_to_cpu(sup->min_io_size), c->min_io_size);
goto failed;
}
if (le32_to_cpu(sup->leb_size) != c->leb_size) {
ubifs_err("LEB size mismatch: %d in superblock, %d real",
le32_to_cpu(sup->leb_size), c->leb_size);
goto failed;
}
if (c->log_lebs < UBIFS_MIN_LOG_LEBS ||
c->lpt_lebs < UBIFS_MIN_LPT_LEBS ||
c->orph_lebs < UBIFS_MIN_ORPH_LEBS ||
c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
err = 4;
goto failed;
}
/*
* Calculate minimum allowed amount of main area LEBs. This is very
* similar to %UBIFS_MIN_LEB_CNT, but we take into account real what we
* have just read from the superblock.
*/
min_leb_cnt = UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs;
min_leb_cnt += c->lpt_lebs + c->orph_lebs + c->jhead_cnt + 6;
if (c->leb_cnt < min_leb_cnt || c->leb_cnt > c->vi.size) {
ubifs_err("bad LEB count: %d in superblock, %d on UBI volume, "
"%d minimum required", c->leb_cnt, c->vi.size,
min_leb_cnt);
goto failed;
}
if (c->max_leb_cnt < c->leb_cnt) {
ubifs_err("max. LEB count %d less than LEB count %d",
c->max_leb_cnt, c->leb_cnt);
goto failed;
}
if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
err = 7;
goto failed;
}
if (c->max_bud_bytes < (long long)c->leb_size * UBIFS_MIN_BUD_LEBS ||
c->max_bud_bytes > (long long)c->leb_size * c->main_lebs) {
err = 8;
goto failed;
}
if (c->jhead_cnt < NONDATA_JHEADS_CNT + 1 ||
c->jhead_cnt > NONDATA_JHEADS_CNT + UBIFS_MAX_JHEADS) {
err = 9;
goto failed;
}
if (c->fanout < UBIFS_MIN_FANOUT ||
ubifs_idx_node_sz(c, c->fanout) > c->leb_size) {
err = 10;
goto failed;
}
if (c->lsave_cnt < 0 || (c->lsave_cnt > DEFAULT_LSAVE_CNT &&
c->lsave_cnt > c->max_leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS -
c->log_lebs - c->lpt_lebs - c->orph_lebs)) {
err = 11;
goto failed;
}
if (UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs + c->lpt_lebs +
c->orph_lebs + c->main_lebs != c->leb_cnt) {
err = 12;
goto failed;
}
if (c->default_compr < 0 || c->default_compr >= UBIFS_COMPR_TYPES_CNT) {
err = 13;
goto failed;
}
max_bytes = c->main_lebs * (long long)c->leb_size;
if (c->rp_size < 0 || max_bytes < c->rp_size) {
err = 14;
goto failed;
}
if (le32_to_cpu(sup->time_gran) > 1000000000 ||
le32_to_cpu(sup->time_gran) < 1) {
err = 15;
goto failed;
}
return 0;
failed:
ubifs_err("bad superblock, error %d", err);
dbg_dump_node(c, sup);
return -EINVAL;
}
/**
* ubifs_read_sb_node - read superblock node.
* @c: UBIFS file-system description object
*
* This function returns a pointer to the superblock node or a negative error
* code.
*/
struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
{
struct ubifs_sb_node *sup;
int err;
sup = kmalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_NOFS);
if (!sup)
return ERR_PTR(-ENOMEM);
err = ubifs_read_node(c, sup, UBIFS_SB_NODE, UBIFS_SB_NODE_SZ,
UBIFS_SB_LNUM, 0);
if (err) {
kfree(sup);
return ERR_PTR(err);
}
return sup;
}
/**
* ubifs_read_superblock - read superblock.
* @c: UBIFS file-system description object
*
* This function finds, reads and checks the superblock. If an empty UBI volume
* is being mounted, this function creates default superblock. Returns zero in
* case of success, and a negative error code in case of failure.
*/
int ubifs_read_superblock(struct ubifs_info *c)
{
int err, sup_flags;
struct ubifs_sb_node *sup;
if (c->empty) {
printf("No UBIFS filesystem found!\n");
return -1;
}
sup = ubifs_read_sb_node(c);
if (IS_ERR(sup))
return PTR_ERR(sup);
/*
* The software supports all previous versions but not future versions,
* due to the unavailability of time-travelling equipment.
*/
c->fmt_version = le32_to_cpu(sup->fmt_version);
if (c->fmt_version > UBIFS_FORMAT_VERSION) {
ubifs_err("on-flash format version is %d, but software only "
"supports up to version %d", c->fmt_version,
UBIFS_FORMAT_VERSION);
err = -EINVAL;
goto out;
}
if (c->fmt_version < 3) {
ubifs_err("on-flash format version %d is not supported",
c->fmt_version);
err = -EINVAL;
goto out;
}
switch (sup->key_hash) {
case UBIFS_KEY_HASH_R5:
c->key_hash = key_r5_hash;
c->key_hash_type = UBIFS_KEY_HASH_R5;
break;
case UBIFS_KEY_HASH_TEST:
c->key_hash = key_test_hash;
c->key_hash_type = UBIFS_KEY_HASH_TEST;
break;
};
c->key_fmt = sup->key_fmt;
switch (c->key_fmt) {
case UBIFS_SIMPLE_KEY_FMT:
c->key_len = UBIFS_SK_LEN;
break;
default:
ubifs_err("unsupported key format");
err = -EINVAL;
goto out;
}
c->leb_cnt = le32_to_cpu(sup->leb_cnt);
c->max_leb_cnt = le32_to_cpu(sup->max_leb_cnt);
c->max_bud_bytes = le64_to_cpu(sup->max_bud_bytes);
c->log_lebs = le32_to_cpu(sup->log_lebs);
c->lpt_lebs = le32_to_cpu(sup->lpt_lebs);
c->orph_lebs = le32_to_cpu(sup->orph_lebs);
c->jhead_cnt = le32_to_cpu(sup->jhead_cnt) + NONDATA_JHEADS_CNT;
c->fanout = le32_to_cpu(sup->fanout);
c->lsave_cnt = le32_to_cpu(sup->lsave_cnt);
c->default_compr = le16_to_cpu(sup->default_compr);
c->rp_size = le64_to_cpu(sup->rp_size);
c->rp_uid = le32_to_cpu(sup->rp_uid);
c->rp_gid = le32_to_cpu(sup->rp_gid);
sup_flags = le32_to_cpu(sup->flags);
c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran);
memcpy(&c->uuid, &sup->uuid, 16);
c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT);
/* Automatically increase file system size to the maximum size */
c->old_leb_cnt = c->leb_cnt;
if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) {
c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size);
dbg_mnt("Auto resizing (ro) from %d LEBs to %d LEBs",
c->old_leb_cnt, c->leb_cnt);
}
c->log_bytes = (long long)c->log_lebs * c->leb_size;
c->log_last = UBIFS_LOG_LNUM + c->log_lebs - 1;
c->lpt_first = UBIFS_LOG_LNUM + c->log_lebs;
c->lpt_last = c->lpt_first + c->lpt_lebs - 1;
c->orph_first = c->lpt_last + 1;
c->orph_last = c->orph_first + c->orph_lebs - 1;
c->main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS;
c->main_lebs -= c->log_lebs + c->lpt_lebs + c->orph_lebs;
c->main_first = c->leb_cnt - c->main_lebs;
c->report_rp_size = ubifs_reported_space(c, c->rp_size);
err = validate_sb(c, sup);
out:
kfree(sup);
return err;
}

362
fs/ubifs/scan.c
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
/*
* This file implements the scan which is a general-purpose function for
* determining what nodes are in an eraseblock. The scan is used to replay the
* journal, to do garbage collection. for the TNC in-the-gaps method, and by
* debugging functions.
*/
#include "ubifs.h"
/**
* scan_padding_bytes - scan for padding bytes.
* @buf: buffer to scan
* @len: length of buffer
*
* This function returns the number of padding bytes on success and
* %SCANNED_GARBAGE on failure.
*/
static int scan_padding_bytes(void *buf, int len)
{
int pad_len = 0, max_pad_len = min_t(int, UBIFS_PAD_NODE_SZ, len);
uint8_t *p = buf;
dbg_scan("not a node");
while (pad_len < max_pad_len && *p++ == UBIFS_PADDING_BYTE)
pad_len += 1;
if (!pad_len || (pad_len & 7))
return SCANNED_GARBAGE;
dbg_scan("%d padding bytes", pad_len);
return pad_len;
}
/**
* ubifs_scan_a_node - scan for a node or padding.
* @c: UBIFS file-system description object
* @buf: buffer to scan
* @len: length of buffer
* @lnum: logical eraseblock number
* @offs: offset within the logical eraseblock
* @quiet: print no messages
*
* This function returns a scanning code to indicate what was scanned.
*/
int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
int offs, int quiet)
{
struct ubifs_ch *ch = buf;
uint32_t magic;
magic = le32_to_cpu(ch->magic);
if (magic == 0xFFFFFFFF) {
dbg_scan("hit empty space");
return SCANNED_EMPTY_SPACE;
}
if (magic != UBIFS_NODE_MAGIC)
return scan_padding_bytes(buf, len);
if (len < UBIFS_CH_SZ)
return SCANNED_GARBAGE;
dbg_scan("scanning %s", dbg_ntype(ch->node_type));
if (ubifs_check_node(c, buf, lnum, offs, quiet, 1))
return SCANNED_A_CORRUPT_NODE;
if (ch->node_type == UBIFS_PAD_NODE) {
struct ubifs_pad_node *pad = buf;
int pad_len = le32_to_cpu(pad->pad_len);
int node_len = le32_to_cpu(ch->len);
/* Validate the padding node */
if (pad_len < 0 ||
offs + node_len + pad_len > c->leb_size) {
if (!quiet) {
ubifs_err("bad pad node at LEB %d:%d",
lnum, offs);
dbg_dump_node(c, pad);
}
return SCANNED_A_BAD_PAD_NODE;
}
/* Make the node pads to 8-byte boundary */
if ((node_len + pad_len) & 7) {
if (!quiet) {
dbg_err("bad padding length %d - %d",
offs, offs + node_len + pad_len);
}
return SCANNED_A_BAD_PAD_NODE;
}
dbg_scan("%d bytes padded, offset now %d",
pad_len, ALIGN(offs + node_len + pad_len, 8));
return node_len + pad_len;
}
return SCANNED_A_NODE;
}
/**
* ubifs_start_scan - create LEB scanning information at start of scan.
* @c: UBIFS file-system description object
* @lnum: logical eraseblock number
* @offs: offset to start at (usually zero)
* @sbuf: scan buffer (must be c->leb_size)
*
* This function returns %0 on success and a negative error code on failure.
*/
struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum,
int offs, void *sbuf)
{
struct ubifs_scan_leb *sleb;
int err;
dbg_scan("scan LEB %d:%d", lnum, offs);
sleb = kzalloc(sizeof(struct ubifs_scan_leb), GFP_NOFS);
if (!sleb)
return ERR_PTR(-ENOMEM);
sleb->lnum = lnum;
INIT_LIST_HEAD(&sleb->nodes);
sleb->buf = sbuf;
err = ubi_read(c->ubi, lnum, sbuf + offs, offs, c->leb_size - offs);
if (err && err != -EBADMSG) {
ubifs_err("cannot read %d bytes from LEB %d:%d,"
" error %d", c->leb_size - offs, lnum, offs, err);
kfree(sleb);
return ERR_PTR(err);
}
if (err == -EBADMSG)
sleb->ecc = 1;
return sleb;
}
/**
* ubifs_end_scan - update LEB scanning information at end of scan.
* @c: UBIFS file-system description object
* @sleb: scanning information
* @lnum: logical eraseblock number
* @offs: offset to start at (usually zero)
*
* This function returns %0 on success and a negative error code on failure.
*/
void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
int lnum, int offs)
{
lnum = lnum;
dbg_scan("stop scanning LEB %d at offset %d", lnum, offs);
ubifs_assert(offs % c->min_io_size == 0);
sleb->endpt = ALIGN(offs, c->min_io_size);
}
/**
* ubifs_add_snod - add a scanned node to LEB scanning information.
* @c: UBIFS file-system description object
* @sleb: scanning information
* @buf: buffer containing node
* @offs: offset of node on flash
*
* This function returns %0 on success and a negative error code on failure.
*/
int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
void *buf, int offs)
{
struct ubifs_ch *ch = buf;
struct ubifs_ino_node *ino = buf;
struct ubifs_scan_node *snod;
snod = kzalloc(sizeof(struct ubifs_scan_node), GFP_NOFS);
if (!snod)
return -ENOMEM;
snod->sqnum = le64_to_cpu(ch->sqnum);
snod->type = ch->node_type;
snod->offs = offs;
snod->len = le32_to_cpu(ch->len);
snod->node = buf;
switch (ch->node_type) {
case UBIFS_INO_NODE:
case UBIFS_DENT_NODE:
case UBIFS_XENT_NODE:
case UBIFS_DATA_NODE:
case UBIFS_TRUN_NODE:
/*
* The key is in the same place in all keyed
* nodes.
*/
key_read(c, &ino->key, &snod->key);
break;
}
list_add_tail(&snod->list, &sleb->nodes);
sleb->nodes_cnt += 1;
return 0;
}
/**
* ubifs_scanned_corruption - print information after UBIFS scanned corruption.
* @c: UBIFS file-system description object
* @lnum: LEB number of corruption
* @offs: offset of corruption
* @buf: buffer containing corruption
*/
void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs,
void *buf)
{
int len;
ubifs_err("corrupted data at LEB %d:%d", lnum, offs);
if (dbg_failure_mode)
return;
len = c->leb_size - offs;
if (len > 4096)
len = 4096;
dbg_err("first %d bytes from LEB %d:%d", len, lnum, offs);
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 4, buf, len, 1);
}
/**
* ubifs_scan - scan a logical eraseblock.
* @c: UBIFS file-system description object
* @lnum: logical eraseblock number
* @offs: offset to start at (usually zero)
* @sbuf: scan buffer (must be c->leb_size)
*
* This function scans LEB number @lnum and returns complete information about
* its contents. Returns an error code in case of failure.
*/
struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
int offs, void *sbuf)
{
void *buf = sbuf + offs;
int err, len = c->leb_size - offs;
struct ubifs_scan_leb *sleb;
sleb = ubifs_start_scan(c, lnum, offs, sbuf);
if (IS_ERR(sleb))
return sleb;
while (len >= 8) {
struct ubifs_ch *ch = buf;
int node_len, ret;
dbg_scan("look at LEB %d:%d (%d bytes left)",
lnum, offs, len);
cond_resched();
ret = ubifs_scan_a_node(c, buf, len, lnum, offs, 0);
if (ret > 0) {
/* Padding bytes or a valid padding node */
offs += ret;
buf += ret;
len -= ret;
continue;
}
if (ret == SCANNED_EMPTY_SPACE)
/* Empty space is checked later */
break;
switch (ret) {
case SCANNED_GARBAGE:
dbg_err("garbage");
goto corrupted;
case SCANNED_A_NODE:
break;
case SCANNED_A_CORRUPT_NODE:
case SCANNED_A_BAD_PAD_NODE:
dbg_err("bad node");
goto corrupted;
default:
dbg_err("unknown");
goto corrupted;
}
err = ubifs_add_snod(c, sleb, buf, offs);
if (err)
goto error;
node_len = ALIGN(le32_to_cpu(ch->len), 8);
offs += node_len;
buf += node_len;
len -= node_len;
}
if (offs % c->min_io_size)
goto corrupted;
ubifs_end_scan(c, sleb, lnum, offs);
for (; len > 4; offs += 4, buf = buf + 4, len -= 4)
if (*(uint32_t *)buf != 0xffffffff)
break;
for (; len; offs++, buf++, len--)
if (*(uint8_t *)buf != 0xff) {
ubifs_err("corrupt empty space at LEB %d:%d",
lnum, offs);
goto corrupted;
}
return sleb;
corrupted:
ubifs_scanned_corruption(c, lnum, offs, buf);
err = -EUCLEAN;
error:
ubifs_err("LEB %d scanning failed", lnum);
ubifs_scan_destroy(sleb);
return ERR_PTR(err);
}
/**
* ubifs_scan_destroy - destroy LEB scanning information.
* @sleb: scanning information to free
*/
void ubifs_scan_destroy(struct ubifs_scan_leb *sleb)
{
struct ubifs_scan_node *node;
struct list_head *head;
head = &sleb->nodes;
while (!list_empty(head)) {
node = list_entry(head->next, struct ubifs_scan_node, list);
list_del(&node->list);
kfree(node);
}
kfree(sleb);
}

1189
fs/ubifs/super.c
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2767
fs/ubifs/tnc.c
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fs/ubifs/tnc_commit.c
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435
fs/ubifs/tnc_misc.c
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
/*
* This file contains miscelanious TNC-related functions shared betweend
* different files. This file does not form any logically separate TNC
* sub-system. The file was created because there is a lot of TNC code and
* putting it all in one file would make that file too big and unreadable.
*/
#include "ubifs.h"
/**
* ubifs_tnc_levelorder_next - next TNC tree element in levelorder traversal.
* @zr: root of the subtree to traverse
* @znode: previous znode
*
* This function implements levelorder TNC traversal. The LNC is ignored.
* Returns the next element or %NULL if @znode is already the last one.
*/
struct ubifs_znode *ubifs_tnc_levelorder_next(struct ubifs_znode *zr,
struct ubifs_znode *znode)
{
int level, iip, level_search = 0;
struct ubifs_znode *zn;
ubifs_assert(zr);
if (unlikely(!znode))
return zr;
if (unlikely(znode == zr)) {
if (znode->level == 0)
return NULL;
return ubifs_tnc_find_child(zr, 0);
}
level = znode->level;
iip = znode->iip;
while (1) {
ubifs_assert(znode->level <= zr->level);
/*
* First walk up until there is a znode with next branch to
* look at.
*/
while (znode->parent != zr && iip >= znode->parent->child_cnt) {
znode = znode->parent;
iip = znode->iip;
}
if (unlikely(znode->parent == zr &&
iip >= znode->parent->child_cnt)) {
/* This level is done, switch to the lower one */
level -= 1;
if (level_search || level < 0)
/*
* We were already looking for znode at lower
* level ('level_search'). As we are here
* again, it just does not exist. Or all levels
* were finished ('level < 0').
*/
return NULL;
level_search = 1;
iip = -1;
znode = ubifs_tnc_find_child(zr, 0);
ubifs_assert(znode);
}
/* Switch to the next index */
zn = ubifs_tnc_find_child(znode->parent, iip + 1);
if (!zn) {
/* No more children to look at, we have walk up */
iip = znode->parent->child_cnt;
continue;
}
/* Walk back down to the level we came from ('level') */
while (zn->level != level) {
znode = zn;
zn = ubifs_tnc_find_child(zn, 0);
if (!zn) {
/*
* This path is not too deep so it does not
* reach 'level'. Try next path.
*/
iip = znode->iip;
break;
}
}
if (zn) {
ubifs_assert(zn->level >= 0);
return zn;
}
}
}
/**
* ubifs_search_zbranch - search znode branch.
* @c: UBIFS file-system description object
* @znode: znode to search in
* @key: key to search for
* @n: znode branch slot number is returned here
*
* This is a helper function which search branch with key @key in @znode using
* binary search. The result of the search may be:
* o exact match, then %1 is returned, and the slot number of the branch is
* stored in @n;
* o no exact match, then %0 is returned and the slot number of the left
* closest branch is returned in @n; the slot if all keys in this znode are
* greater than @key, then %-1 is returned in @n.
*/
int ubifs_search_zbranch(const struct ubifs_info *c,
const struct ubifs_znode *znode,
const union ubifs_key *key, int *n)
{
int beg = 0, end = znode->child_cnt, uninitialized_var(mid);
int uninitialized_var(cmp);
const struct ubifs_zbranch *zbr = &znode->zbranch[0];
ubifs_assert(end > beg);
while (end > beg) {
mid = (beg + end) >> 1;
cmp = keys_cmp(c, key, &zbr[mid].key);
if (cmp > 0)
beg = mid + 1;
else if (cmp < 0)
end = mid;
else {
*n = mid;
return 1;
}
}
*n = end - 1;
/* The insert point is after *n */
ubifs_assert(*n >= -1 && *n < znode->child_cnt);
if (*n == -1)
ubifs_assert(keys_cmp(c, key, &zbr[0].key) < 0);
else
ubifs_assert(keys_cmp(c, key, &zbr[*n].key) > 0);
if (*n + 1 < znode->child_cnt)
ubifs_assert(keys_cmp(c, key, &zbr[*n + 1].key) < 0);
return 0;
}
/**
* ubifs_tnc_postorder_first - find first znode to do postorder tree traversal.
* @znode: znode to start at (root of the sub-tree to traverse)
*
* Find the lowest leftmost znode in a subtree of the TNC tree. The LNC is
* ignored.
*/
struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode)
{
if (unlikely(!znode))
return NULL;
while (znode->level > 0) {
struct ubifs_znode *child;
child = ubifs_tnc_find_child(znode, 0);
if (!child)
return znode;
znode = child;
}
return znode;
}
/**
* ubifs_tnc_postorder_next - next TNC tree element in postorder traversal.
* @znode: previous znode
*
* This function implements postorder TNC traversal. The LNC is ignored.
* Returns the next element or %NULL if @znode is already the last one.
*/
struct ubifs_znode *ubifs_tnc_postorder_next(struct ubifs_znode *znode)
{
struct ubifs_znode *zn;
ubifs_assert(znode);
if (unlikely(!znode->parent))
return NULL;
/* Switch to the next index in the parent */
zn = ubifs_tnc_find_child(znode->parent, znode->iip + 1);
if (!zn)
/* This is in fact the last child, return parent */
return znode->parent;
/* Go to the first znode in this new subtree */
return ubifs_tnc_postorder_first(zn);
}
/**
* read_znode - read an indexing node from flash and fill znode.
* @c: UBIFS file-system description object
* @lnum: LEB of the indexing node to read
* @offs: node offset
* @len: node length
* @znode: znode to read to
*
* This function reads an indexing node from the flash media and fills znode
* with the read data. Returns zero in case of success and a negative error
* code in case of failure. The read indexing node is validated and if anything
* is wrong with it, this function prints complaint messages and returns
* %-EINVAL.
*/
static int read_znode(struct ubifs_info *c, int lnum, int offs, int len,
struct ubifs_znode *znode)
{
int i, err, type, cmp;
struct ubifs_idx_node *idx;
idx = kmalloc(c->max_idx_node_sz, GFP_NOFS);
if (!idx)
return -ENOMEM;
err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
if (err < 0) {
kfree(idx);
return err;
}
znode->child_cnt = le16_to_cpu(idx->child_cnt);
znode->level = le16_to_cpu(idx->level);
dbg_tnc("LEB %d:%d, level %d, %d branch",
lnum, offs, znode->level, znode->child_cnt);
if (znode->child_cnt > c->fanout || znode->level > UBIFS_MAX_LEVELS) {
dbg_err("current fanout %d, branch count %d",
c->fanout, znode->child_cnt);
dbg_err("max levels %d, znode level %d",
UBIFS_MAX_LEVELS, znode->level);
err = 1;
goto out_dump;
}
for (i = 0; i < znode->child_cnt; i++) {
const struct ubifs_branch *br = ubifs_idx_branch(c, idx, i);
struct ubifs_zbranch *zbr = &znode->zbranch[i];
key_read(c, &br->key, &zbr->key);
zbr->lnum = le32_to_cpu(br->lnum);
zbr->offs = le32_to_cpu(br->offs);
zbr->len = le32_to_cpu(br->len);
zbr->znode = NULL;
/* Validate branch */
if (zbr->lnum < c->main_first ||
zbr->lnum >= c->leb_cnt || zbr->offs < 0 ||
zbr->offs + zbr->len > c->leb_size || zbr->offs & 7) {
dbg_err("bad branch %d", i);
err = 2;
goto out_dump;
}
switch (key_type(c, &zbr->key)) {
case UBIFS_INO_KEY:
case UBIFS_DATA_KEY:
case UBIFS_DENT_KEY:
case UBIFS_XENT_KEY:
break;
default:
dbg_msg("bad key type at slot %d: %s", i,
DBGKEY(&zbr->key));
err = 3;
goto out_dump;
}
if (znode->level)
continue;
type = key_type(c, &zbr->key);
if (c->ranges[type].max_len == 0) {
if (zbr->len != c->ranges[type].len) {
dbg_err("bad target node (type %d) length (%d)",
type, zbr->len);
dbg_err("have to be %d", c->ranges[type].len);
err = 4;
goto out_dump;
}
} else if (zbr->len < c->ranges[type].min_len ||
zbr->len > c->ranges[type].max_len) {
dbg_err("bad target node (type %d) length (%d)",
type, zbr->len);
dbg_err("have to be in range of %d-%d",
c->ranges[type].min_len,
c->ranges[type].max_len);
err = 5;
goto out_dump;
}
}
/*
* Ensure that the next key is greater or equivalent to the
* previous one.
*/
for (i = 0; i < znode->child_cnt - 1; i++) {
const union ubifs_key *key1, *key2;
key1 = &znode->zbranch[i].key;
key2 = &znode->zbranch[i + 1].key;
cmp = keys_cmp(c, key1, key2);
if (cmp > 0) {
dbg_err("bad key order (keys %d and %d)", i, i + 1);
err = 6;
goto out_dump;
} else if (cmp == 0 && !is_hash_key(c, key1)) {
/* These can only be keys with colliding hash */
dbg_err("keys %d and %d are not hashed but equivalent",
i, i + 1);
err = 7;
goto out_dump;
}
}
kfree(idx);
return 0;
out_dump:
ubifs_err("bad indexing node at LEB %d:%d, error %d", lnum, offs, err);
dbg_dump_node(c, idx);
kfree(idx);
return -EINVAL;
}
/**
* ubifs_load_znode - load znode to TNC cache.
* @c: UBIFS file-system description object
* @zbr: znode branch
* @parent: znode's parent
* @iip: index in parent
*
* This function loads znode pointed to by @zbr into the TNC cache and
* returns pointer to it in case of success and a negative error code in case
* of failure.
*/
struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c,
struct ubifs_zbranch *zbr,
struct ubifs_znode *parent, int iip)
{
int err;
struct ubifs_znode *znode;
ubifs_assert(!zbr->znode);
/*
* A slab cache is not presently used for znodes because the znode size
* depends on the fanout which is stored in the superblock.
*/
znode = kzalloc(c->max_znode_sz, GFP_NOFS);
if (!znode)
return ERR_PTR(-ENOMEM);
err = read_znode(c, zbr->lnum, zbr->offs, zbr->len, znode);
if (err)
goto out;
zbr->znode = znode;
znode->parent = parent;
znode->time = get_seconds();
znode->iip = iip;
return znode;
out:
kfree(znode);
return ERR_PTR(err);
}
/**
* ubifs_tnc_read_node - read a leaf node from the flash media.
* @c: UBIFS file-system description object
* @zbr: key and position of the node
* @node: node is returned here
*
* This function reads a node defined by @zbr from the flash media. Returns
* zero in case of success or a negative negative error code in case of
* failure.
*/
int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr,
void *node)
{
union ubifs_key key1, *key = &zbr->key;
int err, type = key_type(c, key);
err = ubifs_read_node(c, node, type, zbr->len, zbr->lnum, zbr->offs);
if (err) {
dbg_tnc("key %s", DBGKEY(key));
return err;
}
/* Make sure the key of the read node is correct */
key_read(c, node + UBIFS_KEY_OFFSET, &key1);
if (!keys_eq(c, key, &key1)) {
ubifs_err("bad key in node at LEB %d:%d",
zbr->lnum, zbr->offs);
dbg_tnc("looked for key %s found node's key %s",
DBGKEY(key), DBGKEY1(&key1));
dbg_dump_node(c, node);
return -EINVAL;
}
return 0;
}

751
fs/ubifs/ubifs-media.h
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/*
* This file describes UBIFS on-flash format and contains definitions of all the
* relevant data structures and constants.
*
* All UBIFS on-flash objects are stored in the form of nodes. All nodes start
* with the UBIFS node magic number and have the same common header. Nodes
* always sit at 8-byte aligned positions on the media and node header sizes are
* also 8-byte aligned (except for the indexing node and the padding node).
*/
#ifndef __UBIFS_MEDIA_H__
#define __UBIFS_MEDIA_H__
/* UBIFS node magic number (must not have the padding byte first or last) */
#define UBIFS_NODE_MAGIC 0x06101831
/* UBIFS on-flash format version */
#define UBIFS_FORMAT_VERSION 4
/* Minimum logical eraseblock size in bytes */
#define UBIFS_MIN_LEB_SZ (15*1024)
/* Initial CRC32 value used when calculating CRC checksums */
#define UBIFS_CRC32_INIT 0xFFFFFFFFU
/*
* UBIFS does not try to compress data if its length is less than the below
* constant.
*/
#define UBIFS_MIN_COMPR_LEN 128
/*
* If compressed data length is less than %UBIFS_MIN_COMPRESS_DIFF bytes
* shorter than uncompressed data length, UBIFS preferes to leave this data
* node uncompress, because it'll be read faster.
*/
#define UBIFS_MIN_COMPRESS_DIFF 64
/* Root inode number */
#define UBIFS_ROOT_INO 1
/* Lowest inode number used for regular inodes (not UBIFS-only internal ones) */
#define UBIFS_FIRST_INO 64
/*
* Maximum file name and extended attribute length (must be a multiple of 8,
* minus 1).
*/
#define UBIFS_MAX_NLEN 255
/* Maximum number of data journal heads */
#define UBIFS_MAX_JHEADS 1
/*
* Size of UBIFS data block. Note, UBIFS is not a block oriented file-system,
* which means that it does not treat the underlying media as consisting of
* blocks like in case of hard drives. Do not be confused. UBIFS block is just
* the maximum amount of data which one data node can have or which can be
* attached to an inode node.
*/
#define UBIFS_BLOCK_SIZE 4096
#define UBIFS_BLOCK_SHIFT 12
/* UBIFS padding byte pattern (must not be first or last byte of node magic) */
#define UBIFS_PADDING_BYTE 0xCE
/* Maximum possible key length */
#define UBIFS_MAX_KEY_LEN 16
/* Key length ("simple" format) */
#define UBIFS_SK_LEN 8
/* Minimum index tree fanout */
#define UBIFS_MIN_FANOUT 3
/* Maximum number of levels in UBIFS indexing B-tree */
#define UBIFS_MAX_LEVELS 512
/* Maximum amount of data attached to an inode in bytes */
#define UBIFS_MAX_INO_DATA UBIFS_BLOCK_SIZE
/* LEB Properties Tree fanout (must be power of 2) and fanout shift */
#define UBIFS_LPT_FANOUT 4
#define UBIFS_LPT_FANOUT_SHIFT 2
/* LEB Properties Tree bit field sizes */
#define UBIFS_LPT_CRC_BITS 16
#define UBIFS_LPT_CRC_BYTES 2
#define UBIFS_LPT_TYPE_BITS 4
/* The key is always at the same position in all keyed nodes */
#define UBIFS_KEY_OFFSET offsetof(struct ubifs_ino_node, key)
/*
* LEB Properties Tree node types.
*
* UBIFS_LPT_PNODE: LPT leaf node (contains LEB properties)
* UBIFS_LPT_NNODE: LPT internal node
* UBIFS_LPT_LTAB: LPT's own lprops table
* UBIFS_LPT_LSAVE: LPT's save table (big model only)
* UBIFS_LPT_NODE_CNT: count of LPT node types
* UBIFS_LPT_NOT_A_NODE: all ones (15 for 4 bits) is never a valid node type
*/
enum {
UBIFS_LPT_PNODE,
UBIFS_LPT_NNODE,
UBIFS_LPT_LTAB,
UBIFS_LPT_LSAVE,
UBIFS_LPT_NODE_CNT,
UBIFS_LPT_NOT_A_NODE = (1 << UBIFS_LPT_TYPE_BITS) - 1,
};
/*
* UBIFS inode types.
*
* UBIFS_ITYPE_REG: regular file
* UBIFS_ITYPE_DIR: directory
* UBIFS_ITYPE_LNK: soft link
* UBIFS_ITYPE_BLK: block device node
* UBIFS_ITYPE_CHR: character device node
* UBIFS_ITYPE_FIFO: fifo
* UBIFS_ITYPE_SOCK: socket
* UBIFS_ITYPES_CNT: count of supported file types
*/
enum {
UBIFS_ITYPE_REG,
UBIFS_ITYPE_DIR,
UBIFS_ITYPE_LNK,
UBIFS_ITYPE_BLK,
UBIFS_ITYPE_CHR,
UBIFS_ITYPE_FIFO,
UBIFS_ITYPE_SOCK,
UBIFS_ITYPES_CNT,
};
/*
* Supported key hash functions.
*
* UBIFS_KEY_HASH_R5: R5 hash
* UBIFS_KEY_HASH_TEST: test hash which just returns first 4 bytes of the name
*/
enum {
UBIFS_KEY_HASH_R5,
UBIFS_KEY_HASH_TEST,
};
/*
* Supported key formats.
*
* UBIFS_SIMPLE_KEY_FMT: simple key format
*/
enum {
UBIFS_SIMPLE_KEY_FMT,
};
/*
* The simple key format uses 29 bits for storing UBIFS block number and hash
* value.
*/
#define UBIFS_S_KEY_BLOCK_BITS 29
#define UBIFS_S_KEY_BLOCK_MASK 0x1FFFFFFF
#define UBIFS_S_KEY_HASH_BITS UBIFS_S_KEY_BLOCK_BITS
#define UBIFS_S_KEY_HASH_MASK UBIFS_S_KEY_BLOCK_MASK
/*
* Key types.
*
* UBIFS_INO_KEY: inode node key
* UBIFS_DATA_KEY: data node key
* UBIFS_DENT_KEY: directory entry node key
* UBIFS_XENT_KEY: extended attribute entry key
* UBIFS_KEY_TYPES_CNT: number of supported key types
*/
enum {
UBIFS_INO_KEY,
UBIFS_DATA_KEY,
UBIFS_DENT_KEY,
UBIFS_XENT_KEY,
UBIFS_KEY_TYPES_CNT,
};
/* Count of LEBs reserved for the superblock area */
#define UBIFS_SB_LEBS 1
/* Count of LEBs reserved for the master area */
#define UBIFS_MST_LEBS 2
/* First LEB of the superblock area */
#define UBIFS_SB_LNUM 0
/* First LEB of the master area */
#define UBIFS_MST_LNUM (UBIFS_SB_LNUM + UBIFS_SB_LEBS)
/* First LEB of the log area */
#define UBIFS_LOG_LNUM (UBIFS_MST_LNUM + UBIFS_MST_LEBS)
/*
* The below constants define the absolute minimum values for various UBIFS
* media areas. Many of them actually depend of flash geometry and the FS
* configuration (number of journal heads, orphan LEBs, etc). This means that
* the smallest volume size which can be used for UBIFS cannot be pre-defined
* by these constants. The file-system that meets the below limitation will not
* necessarily mount. UBIFS does run-time calculations and validates the FS
* size.
*/
/* Minimum number of logical eraseblocks in the log */
#define UBIFS_MIN_LOG_LEBS 2
/* Minimum number of bud logical eraseblocks (one for each head) */
#define UBIFS_MIN_BUD_LEBS 3
/* Minimum number of journal logical eraseblocks */
#define UBIFS_MIN_JNL_LEBS (UBIFS_MIN_LOG_LEBS + UBIFS_MIN_BUD_LEBS)
/* Minimum number of LPT area logical eraseblocks */
#define UBIFS_MIN_LPT_LEBS 2
/* Minimum number of orphan area logical eraseblocks */
#define UBIFS_MIN_ORPH_LEBS 1
/*
* Minimum number of main area logical eraseblocks (buds, 3 for the index, 1
* for GC, 1 for deletions, and at least 1 for committed data).
*/
#define UBIFS_MIN_MAIN_LEBS (UBIFS_MIN_BUD_LEBS + 6)
/* Minimum number of logical eraseblocks */
#define UBIFS_MIN_LEB_CNT (UBIFS_SB_LEBS + UBIFS_MST_LEBS + \
UBIFS_MIN_LOG_LEBS + UBIFS_MIN_LPT_LEBS + \
UBIFS_MIN_ORPH_LEBS + UBIFS_MIN_MAIN_LEBS)
/* Node sizes (N.B. these are guaranteed to be multiples of 8) */
#define UBIFS_CH_SZ sizeof(struct ubifs_ch)
#define UBIFS_INO_NODE_SZ sizeof(struct ubifs_ino_node)
#define UBIFS_DATA_NODE_SZ sizeof(struct ubifs_data_node)
#define UBIFS_DENT_NODE_SZ sizeof(struct ubifs_dent_node)
#define UBIFS_TRUN_NODE_SZ sizeof(struct ubifs_trun_node)
#define UBIFS_PAD_NODE_SZ sizeof(struct ubifs_pad_node)
#define UBIFS_SB_NODE_SZ sizeof(struct ubifs_sb_node)
#define UBIFS_MST_NODE_SZ sizeof(struct ubifs_mst_node)
#define UBIFS_REF_NODE_SZ sizeof(struct ubifs_ref_node)
#define UBIFS_IDX_NODE_SZ sizeof(struct ubifs_idx_node)
#define UBIFS_CS_NODE_SZ sizeof(struct ubifs_cs_node)
#define UBIFS_ORPH_NODE_SZ sizeof(struct ubifs_orph_node)
/* Extended attribute entry nodes are identical to directory entry nodes */
#define UBIFS_XENT_NODE_SZ UBIFS_DENT_NODE_SZ
/* Only this does not have to be multiple of 8 bytes */
#define UBIFS_BRANCH_SZ sizeof(struct ubifs_branch)
/* Maximum node sizes (N.B. these are guaranteed to be multiples of 8) */
#define UBIFS_MAX_DATA_NODE_SZ (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE)
#define UBIFS_MAX_INO_NODE_SZ (UBIFS_INO_NODE_SZ + UBIFS_MAX_INO_DATA)
#define UBIFS_MAX_DENT_NODE_SZ (UBIFS_DENT_NODE_SZ + UBIFS_MAX_NLEN + 1)
#define UBIFS_MAX_XENT_NODE_SZ UBIFS_MAX_DENT_NODE_SZ
/* The largest UBIFS node */
#define UBIFS_MAX_NODE_SZ UBIFS_MAX_INO_NODE_SZ
/*
* On-flash inode flags.
*
* UBIFS_COMPR_FL: use compression for this inode
* UBIFS_SYNC_FL: I/O on this inode has to be synchronous
* UBIFS_IMMUTABLE_FL: inode is immutable
* UBIFS_APPEND_FL: writes to the inode may only append data
* UBIFS_DIRSYNC_FL: I/O on this directory inode has to be synchronous
* UBIFS_XATTR_FL: this inode is the inode for an extended attribute value
*
* Note, these are on-flash flags which correspond to ioctl flags
* (@FS_COMPR_FL, etc). They have the same values now, but generally, do not
* have to be the same.
*/
enum {
UBIFS_COMPR_FL = 0x01,
UBIFS_SYNC_FL = 0x02,
UBIFS_IMMUTABLE_FL = 0x04,
UBIFS_APPEND_FL = 0x08,
UBIFS_DIRSYNC_FL = 0x10,
UBIFS_XATTR_FL = 0x20,
};
/* Inode flag bits used by UBIFS */
#define UBIFS_FL_MASK 0x0000001F
/*
* UBIFS compression algorithms.
*
* UBIFS_COMPR_NONE: no compression
* UBIFS_COMPR_LZO: LZO compression
* UBIFS_COMPR_ZLIB: ZLIB compression
* UBIFS_COMPR_TYPES_CNT: count of supported compression types
*/
enum {
UBIFS_COMPR_NONE,
UBIFS_COMPR_LZO,
UBIFS_COMPR_ZLIB,
UBIFS_COMPR_TYPES_CNT,
};
/*
* UBIFS node types.
*
* UBIFS_INO_NODE: inode node
* UBIFS_DATA_NODE: data node
* UBIFS_DENT_NODE: directory entry node
* UBIFS_XENT_NODE: extended attribute node
* UBIFS_TRUN_NODE: truncation node
* UBIFS_PAD_NODE: padding node
* UBIFS_SB_NODE: superblock node
* UBIFS_MST_NODE: master node
* UBIFS_REF_NODE: LEB reference node
* UBIFS_IDX_NODE: index node
* UBIFS_CS_NODE: commit start node
* UBIFS_ORPH_NODE: orphan node
* UBIFS_NODE_TYPES_CNT: count of supported node types
*
* Note, we index arrays by these numbers, so keep them low and contiguous.
* Node type constants for inodes, direntries and so on have to be the same as
* corresponding key type constants.
*/
enum {
UBIFS_INO_NODE,
UBIFS_DATA_NODE,
UBIFS_DENT_NODE,
UBIFS_XENT_NODE,
UBIFS_TRUN_NODE,
UBIFS_PAD_NODE,
UBIFS_SB_NODE,
UBIFS_MST_NODE,
UBIFS_REF_NODE,
UBIFS_IDX_NODE,
UBIFS_CS_NODE,
UBIFS_ORPH_NODE,
UBIFS_NODE_TYPES_CNT,
};
/*
* Master node flags.
*
* UBIFS_MST_DIRTY: rebooted uncleanly - master node is dirty
* UBIFS_MST_NO_ORPHS: no orphan inodes present
* UBIFS_MST_RCVRY: written by recovery
*/
enum {
UBIFS_MST_DIRTY = 1,
UBIFS_MST_NO_ORPHS = 2,
UBIFS_MST_RCVRY = 4,
};
/*
* Node group type (used by recovery to recover whole group or none).
*
* UBIFS_NO_NODE_GROUP: this node is not part of a group
* UBIFS_IN_NODE_GROUP: this node is a part of a group
* UBIFS_LAST_OF_NODE_GROUP: this node is the last in a group
*/
enum {
UBIFS_NO_NODE_GROUP = 0,
UBIFS_IN_NODE_GROUP,
UBIFS_LAST_OF_NODE_GROUP,
};
/*
* Superblock flags.
*
* UBIFS_FLG_BIGLPT: if "big" LPT model is used if set
*/
enum {
UBIFS_FLG_BIGLPT = 0x02,
};
/**
* struct ubifs_ch - common header node.
* @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC)
* @crc: CRC-32 checksum of the node header
* @sqnum: sequence number
* @len: full node length
* @node_type: node type
* @group_type: node group type
* @padding: reserved for future, zeroes
*
* Every UBIFS node starts with this common part. If the node has a key, the
* key always goes next.
*/
struct ubifs_ch {
__le32 magic;
__le32 crc;
__le64 sqnum;
__le32 len;
__u8 node_type;
__u8 group_type;
__u8 padding[2];
} __attribute__ ((packed));
/**
* union ubifs_dev_desc - device node descriptor.
* @new: new type device descriptor
* @huge: huge type device descriptor
*
* This data structure describes major/minor numbers of a device node. In an
* inode is a device node then its data contains an object of this type. UBIFS
* uses standard Linux "new" and "huge" device node encodings.
*/
union ubifs_dev_desc {
__le32 new;
__le64 huge;
} __attribute__ ((packed));
/**
* struct ubifs_ino_node - inode node.
* @ch: common header
* @key: node key
* @creat_sqnum: sequence number at time of creation
* @size: inode size in bytes (amount of uncompressed data)
* @atime_sec: access time seconds
* @ctime_sec: creation time seconds
* @mtime_sec: modification time seconds
* @atime_nsec: access time nanoseconds
* @ctime_nsec: creation time nanoseconds
* @mtime_nsec: modification time nanoseconds
* @nlink: number of hard links
* @uid: owner ID
* @gid: group ID
* @mode: access flags
* @flags: per-inode flags (%UBIFS_COMPR_FL, %UBIFS_SYNC_FL, etc)
* @data_len: inode data length
* @xattr_cnt: count of extended attributes this inode has
* @xattr_size: summarized size of all extended attributes in bytes
* @padding1: reserved for future, zeroes
* @xattr_names: sum of lengths of all extended attribute names belonging to
* this inode
* @compr_type: compression type used for this inode
* @padding2: reserved for future, zeroes
* @data: data attached to the inode
*
* Note, even though inode compression type is defined by @compr_type, some
* nodes of this inode may be compressed with different compressor - this
* happens if compression type is changed while the inode already has data
* nodes. But @compr_type will be use for further writes to the inode.
*
* Note, do not forget to amend 'zero_ino_node_unused()' function when changing
* the padding fields.
*/
struct ubifs_ino_node {
struct ubifs_ch ch;
__u8 key[UBIFS_MAX_KEY_LEN];
__le64 creat_sqnum;
__le64 size;
__le64 atime_sec;
__le64 ctime_sec;
__le64 mtime_sec;
__le32 atime_nsec;
__le32 ctime_nsec;
__le32 mtime_nsec;
__le32 nlink;
__le32 uid;
__le32 gid;
__le32 mode;
__le32 flags;
__le32 data_len;
__le32 xattr_cnt;
__le32 xattr_size;
__u8 padding1[4]; /* Watch 'zero_ino_node_unused()' if changing! */
__le32 xattr_names;
__le16 compr_type;
__u8 padding2[26]; /* Watch 'zero_ino_node_unused()' if changing! */
__u8 data[];
} __attribute__ ((packed));
/**
* struct ubifs_dent_node - directory entry node.
* @ch: common header
* @key: node key
* @inum: target inode number
* @padding1: reserved for future, zeroes
* @type: type of the target inode (%UBIFS_ITYPE_REG, %UBIFS_ITYPE_DIR, etc)
* @nlen: name length
* @padding2: reserved for future, zeroes
* @name: zero-terminated name
*
* Note, do not forget to amend 'zero_dent_node_unused()' function when
* changing the padding fields.
*/
struct ubifs_dent_node {
struct ubifs_ch ch;
__u8 key[UBIFS_MAX_KEY_LEN];
__le64 inum;
__u8 padding1;
__u8 type;
__le16 nlen;
__u8 padding2[4]; /* Watch 'zero_dent_node_unused()' if changing! */
__u8 name[];
} __attribute__ ((packed));
/**
* struct ubifs_data_node - data node.
* @ch: common header
* @key: node key
* @size: uncompressed data size in bytes
* @compr_type: compression type (%UBIFS_COMPR_NONE, %UBIFS_COMPR_LZO, etc)
* @padding: reserved for future, zeroes
* @data: data
*
* Note, do not forget to amend 'zero_data_node_unused()' function when
* changing the padding fields.
*/
struct ubifs_data_node {
struct ubifs_ch ch;
__u8 key[UBIFS_MAX_KEY_LEN];
__le32 size;
__le16 compr_type;
__u8 padding[2]; /* Watch 'zero_data_node_unused()' if changing! */
__u8 data[];
} __attribute__ ((packed));
/**
* struct ubifs_trun_node - truncation node.
* @ch: common header
* @inum: truncated inode number
* @padding: reserved for future, zeroes
* @old_size: size before truncation
* @new_size: size after truncation
*
* This node exists only in the journal and never goes to the main area. Note,
* do not forget to amend 'zero_trun_node_unused()' function when changing the
* padding fields.
*/
struct ubifs_trun_node {
struct ubifs_ch ch;
__le32 inum;
__u8 padding[12]; /* Watch 'zero_trun_node_unused()' if changing! */
__le64 old_size;
__le64 new_size;
} __attribute__ ((packed));
/**
* struct ubifs_pad_node - padding node.
* @ch: common header
* @pad_len: how many bytes after this node are unused (because padded)
* @padding: reserved for future, zeroes
*/
struct ubifs_pad_node {
struct ubifs_ch ch;
__le32 pad_len;
} __attribute__ ((packed));
/**
* struct ubifs_sb_node - superblock node.
* @ch: common header
* @padding: reserved for future, zeroes
* @key_hash: type of hash function used in keys
* @key_fmt: format of the key
* @flags: file-system flags (%UBIFS_FLG_BIGLPT, etc)
* @min_io_size: minimal input/output unit size
* @leb_size: logical eraseblock size in bytes
* @leb_cnt: count of LEBs used by file-system
* @max_leb_cnt: maximum count of LEBs used by file-system
* @max_bud_bytes: maximum amount of data stored in buds
* @log_lebs: log size in logical eraseblocks
* @lpt_lebs: number of LEBs used for lprops table
* @orph_lebs: number of LEBs used for recording orphans
* @jhead_cnt: count of journal heads
* @fanout: tree fanout (max. number of links per indexing node)
* @lsave_cnt: number of LEB numbers in LPT's save table
* @fmt_version: UBIFS on-flash format version
* @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc)
* @padding1: reserved for future, zeroes
* @rp_uid: reserve pool UID
* @rp_gid: reserve pool GID
* @rp_size: size of the reserved pool in bytes
* @padding2: reserved for future, zeroes
* @time_gran: time granularity in nanoseconds
* @uuid: UUID generated when the file system image was created
*/
struct ubifs_sb_node {
struct ubifs_ch ch;
__u8 padding[2];
__u8 key_hash;
__u8 key_fmt;
__le32 flags;
__le32 min_io_size;
__le32 leb_size;
__le32 leb_cnt;
__le32 max_leb_cnt;
__le64 max_bud_bytes;
__le32 log_lebs;
__le32 lpt_lebs;
__le32 orph_lebs;
__le32 jhead_cnt;
__le32 fanout;
__le32 lsave_cnt;
__le32 fmt_version;
__le16 default_compr;
__u8 padding1[2];
__le32 rp_uid;
__le32 rp_gid;
__le64 rp_size;
__le32 time_gran;
__u8 uuid[16];
__u8 padding2[3972];
} __attribute__ ((packed));
/**
* struct ubifs_mst_node - master node.
* @ch: common header
* @highest_inum: highest inode number in the committed index
* @cmt_no: commit number
* @flags: various flags (%UBIFS_MST_DIRTY, etc)
* @log_lnum: start of the log
* @root_lnum: LEB number of the root indexing node
* @root_offs: offset within @root_lnum
* @root_len: root indexing node length
* @gc_lnum: LEB reserved for garbage collection (%-1 value means the LEB was
* not reserved and should be reserved on mount)
* @ihead_lnum: LEB number of index head
* @ihead_offs: offset of index head
* @index_size: size of index on flash
* @total_free: total free space in bytes
* @total_dirty: total dirty space in bytes
* @total_used: total used space in bytes (includes only data LEBs)
* @total_dead: total dead space in bytes (includes only data LEBs)
* @total_dark: total dark space in bytes (includes only data LEBs)
* @lpt_lnum: LEB number of LPT root nnode
* @lpt_offs: offset of LPT root nnode
* @nhead_lnum: LEB number of LPT head
* @nhead_offs: offset of LPT head
* @ltab_lnum: LEB number of LPT's own lprops table
* @ltab_offs: offset of LPT's own lprops table
* @lsave_lnum: LEB number of LPT's save table (big model only)
* @lsave_offs: offset of LPT's save table (big model only)
* @lscan_lnum: LEB number of last LPT scan
* @empty_lebs: number of empty logical eraseblocks
* @idx_lebs: number of indexing logical eraseblocks
* @leb_cnt: count of LEBs used by file-system
* @padding: reserved for future, zeroes
*/
struct ubifs_mst_node {
struct ubifs_ch ch;
__le64 highest_inum;
__le64 cmt_no;
__le32 flags;
__le32 log_lnum;
__le32 root_lnum;
__le32 root_offs;
__le32 root_len;
__le32 gc_lnum;
__le32 ihead_lnum;
__le32 ihead_offs;
__le64 index_size;
__le64 total_free;
__le64 total_dirty;
__le64 total_used;
__le64 total_dead;
__le64 total_dark;
__le32 lpt_lnum;
__le32 lpt_offs;
__le32 nhead_lnum;
__le32 nhead_offs;
__le32 ltab_lnum;
__le32 ltab_offs;
__le32 lsave_lnum;
__le32 lsave_offs;
__le32 lscan_lnum;
__le32 empty_lebs;
__le32 idx_lebs;
__le32 leb_cnt;
__u8 padding[344];
} __attribute__ ((packed));
/**
* struct ubifs_ref_node - logical eraseblock reference node.
* @ch: common header
* @lnum: the referred logical eraseblock number
* @offs: start offset in the referred LEB
* @jhead: journal head number
* @padding: reserved for future, zeroes
*/
struct ubifs_ref_node {
struct ubifs_ch ch;
__le32 lnum;
__le32 offs;
__le32 jhead;
__u8 padding[28];
} __attribute__ ((packed));
/**
* struct ubifs_branch - key/reference/length branch
* @lnum: LEB number of the target node
* @offs: offset within @lnum
* @len: target node length
* @key: key
*/
struct ubifs_branch {
__le32 lnum;
__le32 offs;
__le32 len;
__u8 key[];
} __attribute__ ((packed));
/**
* struct ubifs_idx_node - indexing node.
* @ch: common header
* @child_cnt: number of child index nodes
* @level: tree level
* @branches: LEB number / offset / length / key branches
*/
struct ubifs_idx_node {
struct ubifs_ch ch;
__le16 child_cnt;
__le16 level;
__u8 branches[];
} __attribute__ ((packed));
/**
* struct ubifs_cs_node - commit start node.
* @ch: common header
* @cmt_no: commit number
*/
struct ubifs_cs_node {
struct ubifs_ch ch;
__le64 cmt_no;
} __attribute__ ((packed));
/**
* struct ubifs_orph_node - orphan node.
* @ch: common header
* @cmt_no: commit number (also top bit is set on the last node of the commit)
* @inos: inode numbers of orphans
*/
struct ubifs_orph_node {
struct ubifs_ch ch;
__le64 cmt_no;
__le64 inos[];
} __attribute__ ((packed));
#endif /* __UBIFS_MEDIA_H__ */

684
fs/ubifs/ubifs.c
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@ -0,0 +1,684 @@
/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* (C) Copyright 2008-2009
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
#include "ubifs.h"
#if !defined(CONFIG_SYS_64BIT_VSPRINTF)
#warning Please define CONFIG_SYS_64BIT_VSPRINTF for correct output!
#endif
DECLARE_GLOBAL_DATA_PTR;
/* compress.c */
/*
* We need a wrapper for gunzip() because the parameters are
* incompatible with the lzo decompressor.
*/
static int gzip_decompress(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len)
{
unsigned long len = in_len;
return gunzip(out, *out_len, (unsigned char *)in, &len);
}
/* Fake description object for the "none" compressor */
static struct ubifs_compressor none_compr = {
.compr_type = UBIFS_COMPR_NONE,
.name = "no compression",
.capi_name = "",
.decompress = NULL,
};
static struct ubifs_compressor lzo_compr = {
.compr_type = UBIFS_COMPR_LZO,
.name = "LZO",
.capi_name = "lzo",
.decompress = lzo1x_decompress_safe,
};
static struct ubifs_compressor zlib_compr = {
.compr_type = UBIFS_COMPR_ZLIB,
.name = "zlib",
.capi_name = "deflate",
.decompress = gzip_decompress,
};
/* All UBIFS compressors */
struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
/**
* ubifs_decompress - decompress data.
* @in_buf: data to decompress
* @in_len: length of the data to decompress
* @out_buf: output buffer where decompressed data should
* @out_len: output length is returned here
* @compr_type: type of compression
*
* This function decompresses data from buffer @in_buf into buffer @out_buf.
* The length of the uncompressed data is returned in @out_len. This functions
* returns %0 on success or a negative error code on failure.
*/
int ubifs_decompress(const void *in_buf, int in_len, void *out_buf,
int *out_len, int compr_type)
{
int err;
struct ubifs_compressor *compr;
if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) {
ubifs_err("invalid compression type %d", compr_type);
return -EINVAL;
}
compr = ubifs_compressors[compr_type];
if (unlikely(!compr->capi_name)) {
ubifs_err("%s compression is not compiled in", compr->name);
return -EINVAL;
}
if (compr_type == UBIFS_COMPR_NONE) {
memcpy(out_buf, in_buf, in_len);
*out_len = in_len;
return 0;
}
err = compr->decompress(in_buf, in_len, out_buf, (size_t *)out_len);
if (err)
ubifs_err("cannot decompress %d bytes, compressor %s, "
"error %d", in_len, compr->name, err);
return err;
}
/**
* compr_init - initialize a compressor.
* @compr: compressor description object
*
* This function initializes the requested compressor and returns zero in case
* of success or a negative error code in case of failure.
*/
static int __init compr_init(struct ubifs_compressor *compr)
{
ubifs_compressors[compr->compr_type] = compr;
ubifs_compressors[compr->compr_type]->name += gd->reloc_off;
ubifs_compressors[compr->compr_type]->capi_name += gd->reloc_off;
ubifs_compressors[compr->compr_type]->decompress += gd->reloc_off;
return 0;
}
/**
* ubifs_compressors_init - initialize UBIFS compressors.
*
* This function initializes the compressor which were compiled in. Returns
* zero in case of success and a negative error code in case of failure.
*/
int __init ubifs_compressors_init(void)
{
int err;
err = compr_init(&lzo_compr);
if (err)
return err;
err = compr_init(&zlib_compr);
if (err)
return err;
ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
return 0;
}
/*
* ubifsls...
*/
static int filldir(struct ubifs_info *c, const char *name, int namlen,
u64 ino, unsigned int d_type)
{
struct inode *inode;
char filetime[32];
switch (d_type) {
case UBIFS_ITYPE_REG:
printf("\t");
break;
case UBIFS_ITYPE_DIR:
printf("<DIR>\t");
break;
case UBIFS_ITYPE_LNK:
printf("<LNK>\t");
break;
default:
printf("other\t");
break;
}
inode = ubifs_iget(c->vfs_sb, ino);
if (IS_ERR(inode)) {
printf("%s: Error in ubifs_iget(), ino=%lld ret=%p!\n",
__func__, ino, inode);
return -1;
}
ctime_r((time_t *)&inode->i_mtime, filetime);
printf("%9lld %24.24s ", inode->i_size, filetime);
ubifs_iput(inode);
printf("%s\n", name);
return 0;
}
static int ubifs_printdir(struct file *file, void *dirent)
{
int err, over = 0;
struct qstr nm;
union ubifs_key key;
struct ubifs_dent_node *dent;
struct inode *dir = file->f_path.dentry->d_inode;
struct ubifs_info *c = dir->i_sb->s_fs_info;
dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);
if (file->f_pos > UBIFS_S_KEY_HASH_MASK || file->f_pos == 2)
/*
* The directory was seek'ed to a senseless position or there
* are no more entries.
*/
return 0;
if (file->f_pos == 1) {
/* Find the first entry in TNC and save it */
lowest_dent_key(c, &key, dir->i_ino);
nm.name = NULL;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
file->f_pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
}
dent = file->private_data;
if (!dent) {
/*
* The directory was seek'ed to and is now readdir'ed.
* Find the entry corresponding to @file->f_pos or the
* closest one.
*/
dent_key_init_hash(c, &key, dir->i_ino, file->f_pos);
nm.name = NULL;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
file->f_pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
}
while (1) {
dbg_gen("feed '%s', ino %llu, new f_pos %#x",
dent->name, (unsigned long long)le64_to_cpu(dent->inum),
key_hash_flash(c, &dent->key));
ubifs_assert(le64_to_cpu(dent->ch.sqnum) > ubifs_inode(dir)->creat_sqnum);
nm.len = le16_to_cpu(dent->nlen);
over = filldir(c, (char *)dent->name, nm.len,
le64_to_cpu(dent->inum), dent->type);
if (over)
return 0;
/* Switch to the next entry */
key_read(c, &dent->key, &key);
nm.name = (char *)dent->name;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
kfree(file->private_data);
file->f_pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
cond_resched();
}
out:
if (err != -ENOENT) {
ubifs_err("cannot find next direntry, error %d", err);
return err;
}
kfree(file->private_data);
file->private_data = NULL;
file->f_pos = 2;
return 0;
}
static int ubifs_finddir(struct super_block *sb, char *dirname,
unsigned long root_inum, unsigned long *inum)
{
int err;
struct qstr nm;
union ubifs_key key;
struct ubifs_dent_node *dent;
struct ubifs_info *c;
struct file *file;
struct dentry *dentry;
struct inode *dir;
file = kzalloc(sizeof(struct file), 0);
dentry = kzalloc(sizeof(struct dentry), 0);
dir = kzalloc(sizeof(struct inode), 0);
if (!file || !dentry || !dir) {
printf("%s: Error, no memory for malloc!\n", __func__);
err = -ENOMEM;
goto out;
}
dir->i_sb = sb;
file->f_path.dentry = dentry;
file->f_path.dentry->d_parent = dentry;
file->f_path.dentry->d_inode = dir;
file->f_path.dentry->d_inode->i_ino = root_inum;
c = sb->s_fs_info;
dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);
/* Find the first entry in TNC and save it */
lowest_dent_key(c, &key, dir->i_ino);
nm.name = NULL;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
file->f_pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
while (1) {
dbg_gen("feed '%s', ino %llu, new f_pos %#x",
dent->name, (unsigned long long)le64_to_cpu(dent->inum),
key_hash_flash(c, &dent->key));
ubifs_assert(le64_to_cpu(dent->ch.sqnum) > ubifs_inode(dir)->creat_sqnum);
nm.len = le16_to_cpu(dent->nlen);
if ((strncmp(dirname, (char *)dent->name, nm.len) == 0) &&
(strlen(dirname) == nm.len)) {
*inum = le64_to_cpu(dent->inum);
return 1;
}
/* Switch to the next entry */
key_read(c, &dent->key, &key);
nm.name = (char *)dent->name;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
kfree(file->private_data);
file->f_pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
cond_resched();
}
out:
if (err != -ENOENT) {
ubifs_err("cannot find next direntry, error %d", err);
return err;
}
if (file)
free(file);
if (dentry)
free(dentry);
if (dir)
free(dir);
if (file->private_data)
kfree(file->private_data);
file->private_data = NULL;
file->f_pos = 2;
return 0;
}
static unsigned long ubifs_findfile(struct super_block *sb, char *filename)
{
int ret;
char *next;
char fpath[128];
char *name = fpath;
unsigned long root_inum = 1;
unsigned long inum;
strcpy(fpath, filename);
/* Remove all leading slashes */
while (*name == '/')
name++;
/*
* Handle root-direcoty ('/')
*/
inum = root_inum;
if (!name || *name == '\0')
return inum;
for (;;) {
/* Extract the actual part from the pathname. */
next = strchr(name, '/');
if (next) {
/* Remove all leading slashes. */
while (*next == '/')
*(next++) = '\0';
}
ret = ubifs_finddir(sb, name, root_inum, &inum);
/*
* Check if directory with this name exists
*/
/* Found the node! */
if (!next || *next == '\0') {
if (ret)
return inum;
break;
}
root_inum = inum;
name = next;
}
return 0;
}
int ubifs_ls(char *filename)
{
struct ubifs_info *c = ubifs_sb->s_fs_info;
struct file *file;
struct dentry *dentry;
struct inode *dir;
void *dirent = NULL;
unsigned long inum;
int ret = 0;
c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
inum = ubifs_findfile(ubifs_sb, filename);
if (!inum) {
ret = -1;
goto out;
}
file = kzalloc(sizeof(struct file), 0);
dentry = kzalloc(sizeof(struct dentry), 0);
dir = kzalloc(sizeof(struct inode), 0);
if (!file || !dentry || !dir) {
printf("%s: Error, no memory for malloc!\n", __func__);
ret = -ENOMEM;
goto out_mem;
}
dir->i_sb = ubifs_sb;
file->f_path.dentry = dentry;
file->f_path.dentry->d_parent = dentry;
file->f_path.dentry->d_inode = dir;
file->f_path.dentry->d_inode->i_ino = inum;
file->f_pos = 1;
file->private_data = NULL;
ubifs_printdir(file, dirent);
out_mem:
if (file)
free(file);
if (dentry)
free(dentry);
if (dir)
free(dir);
out:
ubi_close_volume(c->ubi);
return ret;
}
/*
* ubifsload...
*/
/* file.c */
static inline void *kmap(struct page *page)
{
return page->addr;
}
static int read_block(struct inode *inode, void *addr, unsigned int block,
struct ubifs_data_node *dn)
{
struct ubifs_info *c = inode->i_sb->s_fs_info;
int err, len, out_len;
union ubifs_key key;
unsigned int dlen;
data_key_init(c, &key, inode->i_ino, block);
err = ubifs_tnc_lookup(c, &key, dn);
if (err) {
if (err == -ENOENT)
/* Not found, so it must be a hole */
memset(addr, 0, UBIFS_BLOCK_SIZE);
return err;
}
ubifs_assert(le64_to_cpu(dn->ch.sqnum) > ubifs_inode(inode)->creat_sqnum);
len = le32_to_cpu(dn->size);
if (len <= 0 || len > UBIFS_BLOCK_SIZE)
goto dump;
dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
out_len = UBIFS_BLOCK_SIZE;
err = ubifs_decompress(&dn->data, dlen, addr, &out_len,
le16_to_cpu(dn->compr_type));
if (err || len != out_len)
goto dump;
/*
* Data length can be less than a full block, even for blocks that are
* not the last in the file (e.g., as a result of making a hole and
* appending data). Ensure that the remainder is zeroed out.
*/
if (len < UBIFS_BLOCK_SIZE)
memset(addr + len, 0, UBIFS_BLOCK_SIZE - len);
return 0;
dump:
ubifs_err("bad data node (block %u, inode %lu)",
block, inode->i_ino);
dbg_dump_node(c, dn);
return -EINVAL;
}
static int do_readpage(struct ubifs_info *c, struct inode *inode, struct page *page)
{
void *addr;
int err = 0, i;
unsigned int block, beyond;
struct ubifs_data_node *dn;
loff_t i_size = inode->i_size;
dbg_gen("ino %lu, pg %lu, i_size %lld",
inode->i_ino, page->index, i_size);
addr = kmap(page);
block = page->index << UBIFS_BLOCKS_PER_PAGE_SHIFT;
beyond = (i_size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
if (block >= beyond) {
/* Reading beyond inode */
memset(addr, 0, PAGE_CACHE_SIZE);
goto out;
}
dn = kmalloc(UBIFS_MAX_DATA_NODE_SZ, GFP_NOFS);
if (!dn) {
err = -ENOMEM;
goto error;
}
i = 0;
while (1) {
int ret;
if (block >= beyond) {
/* Reading beyond inode */
err = -ENOENT;
memset(addr, 0, UBIFS_BLOCK_SIZE);
} else {
ret = read_block(inode, addr, block, dn);
if (ret) {
err = ret;
if (err != -ENOENT)
break;
} else if (block + 1 == beyond) {
int dlen = le32_to_cpu(dn->size);
int ilen = i_size & (UBIFS_BLOCK_SIZE - 1);
if (ilen && ilen < dlen)
memset(addr + ilen, 0, dlen - ilen);
}
}
if (++i >= UBIFS_BLOCKS_PER_PAGE)
break;
block += 1;
addr += UBIFS_BLOCK_SIZE;
}
if (err) {
if (err == -ENOENT) {
/* Not found, so it must be a hole */
dbg_gen("hole");
goto out_free;
}
ubifs_err("cannot read page %lu of inode %lu, error %d",
page->index, inode->i_ino, err);
goto error;
}
out_free:
kfree(dn);
out:
return 0;
error:
kfree(dn);
return err;
}
int ubifs_load(char *filename, u32 addr, u32 size)
{
struct ubifs_info *c = ubifs_sb->s_fs_info;
unsigned long inum;
struct inode *inode;
struct page page;
int err = 0;
int i;
int count;
char link_name[64];
struct ubifs_inode *ui;
c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
inum = ubifs_findfile(ubifs_sb, filename);
if (!inum) {
err = -1;
goto out;
}
/*
* Read file inode
*/
inode = ubifs_iget(ubifs_sb, inum);
if (IS_ERR(inode)) {
printf("%s: Error reading inode %ld!\n", __func__, inum);
err = PTR_ERR(inode);
goto out;
}
/*
* Check for symbolic link
*/
ui = ubifs_inode(inode);
if (((inode->i_mode & S_IFMT) == S_IFLNK) && ui->data_len) {
memcpy(link_name, ui->data, ui->data_len);
printf("%s is linked to %s!\n", filename, link_name);
ubifs_iput(inode);
/*
* Now we have the "real" filename, call ubifs_load()
* again (recursive call) to load this file instead
*/
return ubifs_load(link_name, addr, size);
}
/*
* If no size was specified or if size bigger than filesize
* set size to filesize
*/
if ((size == 0) || (size > inode->i_size))
size = inode->i_size;
count = (size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
printf("Loading file '%s' to addr 0x%08x with size %d (0x%08x)...\n",
filename, addr, size, size);
page.addr = (void *)addr;
page.index = 0;
page.inode = inode;
for (i = 0; i < count; i++) {
err = do_readpage(c, inode, &page);
if (err)
break;
page.addr += PAGE_SIZE;
page.index++;
}
if (err)
printf("Error reading file '%s'\n", filename);
else
printf("Done\n");
ubifs_iput(inode);
out:
ubi_close_volume(c->ubi);
return err;
}

2173
fs/ubifs/ubifs.h
View File

File diff suppressed because it is too large Load Diff

85
include/linux/math64.h
Unescape View File

@ -0,0 +1,85 @@
#ifndef _LINUX_MATH64_H
#define _LINUX_MATH64_H
#include <linux/types.h>
#if BITS_PER_LONG == 64
/**
* div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
*
* This is commonly provided by 32bit archs to provide an optimized 64bit
* divide.
*/
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
*remainder = dividend % divisor;
return dividend / divisor;
}
/**
* div_s64_rem - signed 64bit divide with 32bit divisor with remainder
*/
static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
{
*remainder = dividend % divisor;
return dividend / divisor;
}
/**
* div64_u64 - unsigned 64bit divide with 64bit divisor
*/
static inline u64 div64_u64(u64 dividend, u64 divisor)
{
return dividend / divisor;
}
#elif BITS_PER_LONG == 32
#ifndef div_u64_rem
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
*remainder = do_div(dividend, divisor);
return dividend;
}
#endif
#ifndef div_s64_rem
extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
#endif
#ifndef div64_u64
extern u64 div64_u64(u64 dividend, u64 divisor);
#endif
#endif /* BITS_PER_LONG */
/**
* div_u64 - unsigned 64bit divide with 32bit divisor
*
* This is the most common 64bit divide and should be used if possible,
* as many 32bit archs can optimize this variant better than a full 64bit
* divide.
*/
#ifndef div_u64
static inline u64 div_u64(u64 dividend, u32 divisor)
{
u32 remainder;
return div_u64_rem(dividend, divisor, &remainder);
}
#endif
/**
* div_s64 - signed 64bit divide with 32bit divisor
*/
#ifndef div_s64
static inline s64 div_s64(s64 dividend, s32 divisor)
{
s32 remainder;
return div_s64_rem(dividend, divisor, &remainder);
}
#endif
u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
#endif /* _LINUX_MATH64_H */

9
include/ubi_uboot.h
Unescape View File

@ -18,7 +18,12 @@
#include <malloc.h>
#include <div64.h>
#include <linux/crc32.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/string.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/ubi.h>
#ifdef CONFIG_CMD_ONENAND
#include <onenand_uboot.h>
@ -193,7 +198,7 @@ static inline long IS_ERR(const void *ptr)
/* module */
#define THIS_MODULE 0
#define try_module_get(...) 0
#define try_module_get(...) 1
#define module_put(...) do { } while (0)
#define module_init(...)
#define module_exit(...)
@ -206,7 +211,9 @@ static inline long IS_ERR(const void *ptr)
#define MODULE_AUTHOR(...)
#define MODULE_LICENSE(...)
#ifndef __UBIFS_H__
#include "../drivers/mtd/ubi/ubi.h"
#endif
/* functions */
extern int ubi_mtd_param_parse(const char *val, struct kernel_param *kp);

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