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mufs: optimise memory footprint of write_dirent()

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This commit is contained in:
S.J.R. van Schaik 2017-06-16 15:57:00 +02:00
parent 0484f082ee
commit 807959eb29
1 changed files with 15 additions and 9 deletions
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24
source/fs/mufs/dir.c
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@ -270,9 +270,12 @@ size_t write_dirent(struct mufs_tree *tree,
{
struct mufs *fs = tree->fs;
struct flash_dev *dev = fs->dev;
char data[1 << dev->log2_block_size];
struct mufs_dentry entry;
size_t size;
size_t block_size = 1 << dev->log2_block_size;
uint32_t offset;
offset = va & ((UINT32_C(1) << dev->log2_block_size) - 1);
va = align(va, dev->log2_block_size);
entry.type = dirent->type;
entry.tree.file_size = dirent->tree.file_size;
@ -280,15 +283,18 @@ size_t write_dirent(struct mufs_tree *tree,
entry.tree.depth = dirent->tree.depth;
entry.path_len = strlen(dirent->path);
memcpy(data, &entry, sizeof entry);
memcpy(data + sizeof entry, dirent->path, entry.path_len);
size = sizeof entry + entry.path_len;
if (mufs_tree_write(tree, data, va, size) == 0)
if (block_size - offset < sizeof entry + entry.path_len)
return 0;
va += sizeof entry + entry.path_len;
tree->file_size = max(tree->file_size, va);
if (mufs_tree_write(tree, dirent->path, va + offset + sizeof entry,
entry.path_len) == 0)
return 0;
if (mufs_tree_write(tree, &entry, va + offset, sizeof entry) == 0)
return 0;
tree->file_size = max(tree->file_size, va + offset + sizeof entry +
entry.path_len);
if (tree->file_size <= va && mufs_sync_tree(tree) < 0)
return 0;