From f9e4fb53938de5db01950c9dfe479703b2f5c964 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Mon, 7 Jan 2013 10:10:12 +0000 Subject: 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 Signed-off-by: Josef Bacik --- fs/btrfs/file.c | 9 ++++++--- fs/btrfs/inode.c | 11 ++++++++--- 2 files changed, 14 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index fa48051484b..841cfe3be0e 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -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; + } } } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 4ddcf79e789..ac98384b174 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -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; -- cgit v1.2.3