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authorJosef Bacik <josef@redhat.com>2011-02-03 02:39:52 +0000
committerChris Mason <chris.mason@oracle.com>2011-02-06 07:13:12 -0500
commit13dbc08987f25d9dba488a34b44b43e3844b027c (patch)
parent98d5dc13e7e74b77ca3b4c3cbded9f48d2dbbbb7 (diff)
Btrfs: make sure search_bitmap finds something in remove_from_bitmap
When we're cleaning up the tree log we need to be able to remove free space from the block group. The problem is if that free space spans bitmaps we would not find the space since we're looking for too many bytes. So make sure the amount of bytes we search for is limited to either the number of bytes we want, or the number of bytes left in the bitmap. This was tested by a user who was hitting the BUG() after search_bitmap. With this patch he can now mount his fs. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index a5501edc3c9f..a0390657451b 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1216,6 +1216,7 @@ again:
search_start = *offset;
search_bytes = *bytes;
+ search_bytes = min(search_bytes, end - search_start + 1);
ret = search_bitmap(block_group, bitmap_info, &search_start,
BUG_ON(ret < 0 || search_start != *offset);