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authorChris Mason <chris.mason@oracle.com>2009-04-24 14:39:24 -0400
committerChris Mason <chris.mason@oracle.com>2009-04-24 15:46:05 -0400
commite980b50cda1610f1c17978d9b7fd311a9dd93877 (patch)
treea5ab72fa4b791758e25fd6ece6f1aedd29954e7b /fs/btrfs/file.c
parent9601e3f6336f6ca66929f451b1f66085e68e36e3 (diff)
downloadop-kernel-dev-e980b50cda1610f1c17978d9b7fd311a9dd93877.zip
op-kernel-dev-e980b50cda1610f1c17978d9b7fd311a9dd93877.tar.gz
Btrfs: fix fallocate deadlock on inode extent lock
The btrfs fallocate call takes an extent lock on the entire range being fallocated, and then runs through insert_reserved_extent on each extent as they are allocated. The problem with this is that btrfs_drop_extents may decide to try and take the same extent lock fallocate was already holding. The solution used here is to push down knowledge of the range that is already locked going into btrfs_drop_extents. It turns out that at least one other caller had the same bug. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 482f8db..da3ed96 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -363,15 +363,16 @@ out:
*/
noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
- u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
+ u64 start, u64 end, u64 locked_end,
+ u64 inline_limit, u64 *hint_byte)
{
u64 extent_end = 0;
- u64 locked_end = end;
u64 search_start = start;
u64 leaf_start;
u64 ram_bytes = 0;
u64 orig_parent = 0;
u64 disk_bytenr = 0;
+ u64 orig_locked_end = locked_end;
u8 compression;
u8 encryption;
u16 other_encoding = 0;
@@ -684,9 +685,9 @@ next_slot:
}
out:
btrfs_free_path(path);
- if (locked_end > end) {
- unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1,
- GFP_NOFS);
+ if (locked_end > orig_locked_end) {
+ unlock_extent(&BTRFS_I(inode)->io_tree, orig_locked_end,
+ locked_end - 1, GFP_NOFS);
}
btrfs_check_file(root, inode);
return ret;
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