mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 02:19:51 +00:00
Btrfs: handle only applicable errors returned by btrfs_get_extent
btrfs_get_extent() never returns NULL pointers, so this code introduces a static checker warning. The btrfs_get_extent() is a bit complex, but trust me that it doesn't return NULLs and also if it did we would trigger the BUG_ON(!em) before the last return statement. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> [ updated subject ] Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
parent
82bafb38c2
commit
9986277e0e
2 changed files with 15 additions and 26 deletions
|
@ -2342,13 +2342,8 @@ static int find_first_non_hole(struct inode *inode, u64 *start, u64 *len)
|
|||
int ret = 0;
|
||||
|
||||
em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, *start, *len, 0);
|
||||
if (IS_ERR_OR_NULL(em)) {
|
||||
if (!em)
|
||||
ret = -ENOMEM;
|
||||
else
|
||||
ret = PTR_ERR(em);
|
||||
return ret;
|
||||
}
|
||||
if (IS_ERR(em))
|
||||
return PTR_ERR(em);
|
||||
|
||||
/* Hole or vacuum extent(only exists in no-hole mode) */
|
||||
if (em->block_start == EXTENT_MAP_HOLE) {
|
||||
|
@ -2835,11 +2830,8 @@ static long btrfs_fallocate(struct file *file, int mode,
|
|||
while (1) {
|
||||
em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur_offset,
|
||||
alloc_end - cur_offset, 0);
|
||||
if (IS_ERR_OR_NULL(em)) {
|
||||
if (!em)
|
||||
ret = -ENOMEM;
|
||||
else
|
||||
ret = PTR_ERR(em);
|
||||
if (IS_ERR(em)) {
|
||||
ret = PTR_ERR(em);
|
||||
break;
|
||||
}
|
||||
last_byte = min(extent_map_end(em), alloc_end);
|
||||
|
|
|
@ -6736,7 +6736,6 @@ static noinline int uncompress_inline(struct btrfs_path *path,
|
|||
*
|
||||
* This also copies inline extents directly into the page.
|
||||
*/
|
||||
|
||||
struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
|
||||
struct page *page,
|
||||
size_t pg_offset, u64 start, u64 len,
|
||||
|
@ -7045,19 +7044,17 @@ struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
|
|||
em = btrfs_get_extent(inode, page, pg_offset, start, len, create);
|
||||
if (IS_ERR(em))
|
||||
return em;
|
||||
if (em) {
|
||||
/*
|
||||
* if our em maps to
|
||||
* - a hole or
|
||||
* - a pre-alloc extent,
|
||||
* there might actually be delalloc bytes behind it.
|
||||
*/
|
||||
if (em->block_start != EXTENT_MAP_HOLE &&
|
||||
!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
||||
return em;
|
||||
else
|
||||
hole_em = em;
|
||||
}
|
||||
/*
|
||||
* If our em maps to:
|
||||
* - a hole or
|
||||
* - a pre-alloc extent,
|
||||
* there might actually be delalloc bytes behind it.
|
||||
*/
|
||||
if (em->block_start != EXTENT_MAP_HOLE &&
|
||||
!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
||||
return em;
|
||||
else
|
||||
hole_em = em;
|
||||
|
||||
/* check to see if we've wrapped (len == -1 or similar) */
|
||||
end = start + len;
|
||||
|
|
Loading…
Reference in a new issue