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mufs: add find_dirent_size() to determine how many bytes are used within a directory bin

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This commit is contained in:
S.J.R. van Schaik 2017-06-14 06:20:11 +02:00
parent 7107daa4b5
commit f2d4d60c01
3 changed files with 37 additions and 0 deletions
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33
source/fs/mufs/dir.c
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@ -182,6 +182,39 @@ void mufs_closedir(struct mufs_dir *dir)
free(dir);
}
size_t find_dirent_size(struct mufs *fs, struct mufs_tree *tree,
uint32_t va)
{
struct flash_dev *dev = fs->dev;
size_t block_size = 1 << dev->log2_block_size;
char data[block_size];
struct mufs_dentry *entry;
uint32_t offset, len;
va = align(va, dev->log2_block_size);
if (mufs_tree_read(tree, data, va, 1 << dev->log2_block_size) == 0)
return 0;
for (offset = 0; offset < block_size; offset += len) {
entry = (struct mufs_dentry *)(data + offset);
len = sizeof *entry;
if (block_size - offset < len)
break;
if (!entry->type)
break;
len += entry->path_len;
if (block_size - offset < len)
break;
}
return offset;
}
size_t read_dirent(struct mufs *fs, struct mufs_tree *tree,
struct mufs_dirent *dirent, uint32_t va)
{

2
source/fs/mufs/dir.h
View file

@ -20,6 +20,8 @@ struct mufs_dentry {
struct mufs_tree *resolve_path(struct mufs *fs, const char *path,
struct mufs_stat *stat);
size_t find_dirent_size(struct mufs *fs, struct mufs_tree *tree,
uint32_t va);
size_t read_dirent(struct mufs *fs, struct mufs_tree *tree,
struct mufs_dirent *dirent, uint32_t va);
size_t write_dirent(struct mufs_tree *tree,

2
source/fs/mufs/path.c
View file

@ -53,6 +53,8 @@ int mufs_mkpath(struct mufs *fs, const char *path, unsigned type)
dirent.tree.root = 0;
dirent.tree.depth = 0;
tree->file_size = find_dirent_size(fs, tree, tree->file_size);
if (!is_aligned(tree->file_size, fs->dev->log2_block_size) &&
write_dirent(tree, tree->file_size, &dirent) > 0)
return 0;