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Btrfs: fix a bug when llseek for delalloc bytes behind prealloc extents 

xfstests case 285 complains.

It it because btrfs did not try to find unwritten delalloc
bytes(only dirty pages, not yet writeback) behind prealloc
extents, it ends up finding nothing while we're with SEEK_DATA.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Liu Bo 2013-01-07 10:10:12 +00:00 committed by Josef Bacik
parent 1214b53f90
commit f9e4fb5393
2 changed files with 14 additions and 6 deletions
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9
fs/btrfs/file.c
View File

@ -2309,9 +2309,12 @@ static int find_desired_extent(struct inode *inode, loff_t *offset, int origin)
}
}
*offset = start;
free_extent_map(em);
break;
if (!test_bit(EXTENT_FLAG_PREALLOC,
&em->flags)) {
*offset = start;
free_extent_map(em);
break;
}
}
}

11
fs/btrfs/inode.c
View File

@ -5623,10 +5623,13 @@ struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *pag
return em;
if (em) {
/*
* if our em maps to a hole, there might
* actually be delalloc bytes behind it
* 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)
if (em->block_start != EXTENT_MAP_HOLE &&
!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
return em;
else
hole_em = em;
@ -5708,6 +5711,8 @@ struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *pag
*/
em->block_start = hole_em->block_start;
em->block_len = hole_len;
if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags))
set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
} else {
em->start = range_start;
em->len = found;