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authorJosef Bacik <josef@redhat.com>2009-10-01 17:10:23 -0400
committerChris Mason <chris.mason@oracle.com>2009-10-01 17:10:23 -0400
commitfbf190874407f23d2891b53ffdf7d3c6be8d47ff (patch)
treec60ab388e2b19b02fd3bbcef76498a3520f9dcbd
parentab93dbecfba72bbc04b7036343d180aaff1b61a3 (diff)
Btrfs: fix data space leak fix
There is a problem where page_mkwrite can be called on a dirtied page that already has a delalloc range associated with it. The fix is to clear any delalloc bits for the range we are dirtying so the space accounting gets handled properly. This is the same thing we do in the normal write case, so we are consistent across the board. With this patch we no longer leak reserved space. Signed-off-by: Josef Bacik <jbacik@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/inode.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3cc5677f544..3a6f953337b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4909,10 +4909,21 @@ again:
goto again;
}
+ /*
+ * XXX - page_mkwrite gets called every time the page is dirtied, even
+ * if it was already dirty, so for space accounting reasons we need to
+ * clear any delalloc bits for the range we are fixing to save. There
+ * is probably a better way to do this, but for now keep consistent with
+ * prepare_pages in the normal write path.
+ */
+ clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
+ EXTENT_DIRTY | EXTENT_DELALLOC, GFP_NOFS);
+
ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
if (ret) {
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
ret = VM_FAULT_SIGBUS;
+ btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
goto out_unlock;
}
ret = 0;