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f2fs: revisit inline_data to avoid data races and potential bugs

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This patch simplifies the inline_data usage with the following rule.
1. inline_data is set during the file creation.
2. If new data is requested to be written ranges out of inline_data,
 f2fs converts that inode permanently.
3. There is no cases which converts non-inline_data inode to inline_data.
4. The inline_data flag should be changed under inode page lock.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2014-10-23 19:48:09 -07:00
parent 1f7732fe6c
commit b3d208f96d
7 changed files with 252 additions and 213 deletions
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33
fs/f2fs/inode.c
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@@ -67,12 +67,38 @@ static void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
}
}
static int __recover_inline_status(struct inode *inode, struct page *ipage)
{
void *inline_data = inline_data_addr(ipage);
struct f2fs_inode *ri;
void *zbuf;
zbuf = kzalloc(MAX_INLINE_DATA, GFP_NOFS);
if (!zbuf)
return -ENOMEM;
if (!memcmp(zbuf, inline_data, MAX_INLINE_DATA)) {
kfree(zbuf);
return 0;
}
kfree(zbuf);
f2fs_wait_on_page_writeback(ipage, NODE);
set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
ri = F2FS_INODE(ipage);
set_raw_inline(F2FS_I(inode), ri);
set_page_dirty(ipage);
return 0;
}
static int do_read_inode(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct f2fs_inode_info *fi = F2FS_I(inode);
struct page *node_page;
struct f2fs_inode *ri;
int err = 0;
/* Check if ino is within scope */
if (check_nid_range(sbi, inode->i_ino)) {
@@ -114,11 +140,15 @@ static int do_read_inode(struct inode *inode)
get_extent_info(&fi->ext, ri->i_ext);
get_inline_info(fi, ri);
/* check data exist */
if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
err = __recover_inline_status(inode, node_page);
/* get rdev by using inline_info */
__get_inode_rdev(inode, ri);
f2fs_put_page(node_page, 1);
return 0;
return err;
}
struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
@@ -329,6 +359,7 @@ void handle_failed_inode(struct inode *inode)
remove_inode_page(inode);
clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
clear_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
alloc_nid_failed(sbi, inode->i_ino);
f2fs_unlock_op(sbi);