f2fs: compress: do sanity check on cluster
This patch adds f2fs_sanity_check_cluster() to support doing
sanity check on cluster of compressed file, it will be triggered
from below two paths:
- __f2fs_cluster_blocks()
- f2fs_map_blocks(F2FS_GET_BLOCK_FIEMAP)
And it can detect below three kind of cluster insanity status.
C: COMPRESS_ADDR
N: NULL_ADDR or NEW_ADDR
V: valid blkaddr
*: any value
1. [*|C|*|*]
2. [C|*|C|*]
3. [C|N|N|V]
Signed-off-by: Chao Yu <chao@kernel.org>
[Nathan Chancellor: fix missing inline warning]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 12cd636..e4e4eb8 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1552,6 +1552,13 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
map->m_flags |= F2FS_MAP_NEW;
blkaddr = dn.data_blkaddr;
} else {
+ if (f2fs_compressed_file(inode) &&
+ f2fs_sanity_check_cluster(&dn) &&
+ (flag != F2FS_GET_BLOCK_FIEMAP ||
+ IS_ENABLED(CONFIG_F2FS_CHECK_FS))) {
+ err = -EFSCORRUPTED;
+ goto sync_out;
+ }
if (flag == F2FS_GET_BLOCK_BMAP) {
map->m_pblk = 0;
goto sync_out;
