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f2fs: fix incorrect mapping in ->bmap

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Currently, generic_block_bmap is used in f2fs_bmap, its semantics is when
the mapping is been found, return position of target physical block,
otherwise return zero.

But, previously, when there is no mapping info for specified logical block,
f2fs_bmap will map target physical block to a uninitialized variable, which
should be wrong. Fix it.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2016-05-05 19:13:02 +08:00 committed by Jaegeuk Kim
parent fb58ae2206
commit 43473f9645
1 changed files with 7 additions and 4 deletions
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11
fs/f2fs/data.c
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@ -648,6 +648,8 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, pgofs, mode);
if (err) {
if (flag == F2FS_GET_BLOCK_BMAP)
map->m_pblk = 0;
if (err == -ENOENT) {
err = 0;
if (map->m_next_pgofs)
@ -683,19 +685,20 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
map->m_flags = F2FS_MAP_NEW;
blkaddr = dn.data_blkaddr;
} else {
if (flag == F2FS_GET_BLOCK_BMAP) {
map->m_pblk = 0;
goto sync_out;
}
if (flag == F2FS_GET_BLOCK_FIEMAP &&
blkaddr == NULL_ADDR) {
if (map->m_next_pgofs)
*map->m_next_pgofs = pgofs + 1;
}
if (flag != F2FS_GET_BLOCK_FIEMAP ||
blkaddr != NEW_ADDR) {
if (flag == F2FS_GET_BLOCK_BMAP)
err = -ENOENT;
blkaddr != NEW_ADDR)
goto sync_out;
}
}
}
if (map->m_len == 0) {
/* preallocated unwritten block should be mapped for fiemap. */