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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2014-10-15 17:24:34 (GMT) |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2014-11-04 00:07:29 (GMT) |
| commit | 1ce86bf6f882381013e12b16bbb3921608c0f238 (patch) | |
| tree | f0549d36787483b38b161879e24e26d098c790dc /fs/f2fs/file.c | |
| parent | c08a690b46919e6b531c1a2bb74389323e5f5b1c (diff) | |
| download | linux-1ce86bf6f882381013e12b16bbb3921608c0f238.tar.xz | |
f2fs: fix race conditon on truncation with inline_data
Let's consider the following scenario.
blkaddr[0] inline_data i_size i_blocks writepage truncate
NEW X 4096 2 dirty page #0
NEW X 0 change i_size
NEW X 0 2 f2fs_write_inline_data
NEW X 0 2 get_dnode_of_data
NEW X 0 2 truncate_data_blocks_range
NULL O 0 1 memcpy(inline_data)
NULL O 0 1 f2fs_put_dnode
NULL O 0 1 f2fs_truncate
NULL O 0 1 get_dnode_of_data
NULL O 0 1 *invalid block addr*
This patch adds checking inline_data flag during f2fs_truncate not to refer
corrupted block indices.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/file.c')
| -rw-r--r-- | fs/f2fs/file.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 8e68bb6..543d8c6 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -473,6 +473,12 @@ int truncate_blocks(struct inode *inode, u64 from, bool lock) return err; } + /* writepage can convert inline_data under get_donde_of_data */ + if (f2fs_has_inline_data(inode)) { + f2fs_put_dnode(&dn); + goto done; + } + count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); count -= dn.ofs_in_node; |