mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-23 19:11:51 +00:00
btrfs: protect space cache inode alloc with GFP_NOFS
commit 84de76a2fb
upstream.
If we're allocating a new space cache inode it's likely going to be
under a transaction handle, so we need to use memalloc_nofs_save() in
order to avoid deadlocks, and more importantly lockdep messages that
make xfstests fail.
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
0de8cf3f99
commit
9006ad16ef
1 changed files with 8 additions and 0 deletions
|
@ -10,6 +10,7 @@
|
||||||
#include <linux/math64.h>
|
#include <linux/math64.h>
|
||||||
#include <linux/ratelimit.h>
|
#include <linux/ratelimit.h>
|
||||||
#include <linux/error-injection.h>
|
#include <linux/error-injection.h>
|
||||||
|
#include <linux/sched/mm.h>
|
||||||
#include "ctree.h"
|
#include "ctree.h"
|
||||||
#include "free-space-cache.h"
|
#include "free-space-cache.h"
|
||||||
#include "transaction.h"
|
#include "transaction.h"
|
||||||
|
@ -47,6 +48,7 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
|
||||||
struct btrfs_free_space_header *header;
|
struct btrfs_free_space_header *header;
|
||||||
struct extent_buffer *leaf;
|
struct extent_buffer *leaf;
|
||||||
struct inode *inode = NULL;
|
struct inode *inode = NULL;
|
||||||
|
unsigned nofs_flag;
|
||||||
int ret;
|
int ret;
|
||||||
|
|
||||||
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
|
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
|
||||||
|
@ -68,7 +70,13 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
|
||||||
btrfs_disk_key_to_cpu(&location, &disk_key);
|
btrfs_disk_key_to_cpu(&location, &disk_key);
|
||||||
btrfs_release_path(path);
|
btrfs_release_path(path);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* We are often under a trans handle at this point, so we need to make
|
||||||
|
* sure NOFS is set to keep us from deadlocking.
|
||||||
|
*/
|
||||||
|
nofs_flag = memalloc_nofs_save();
|
||||||
inode = btrfs_iget(fs_info->sb, &location, root, NULL);
|
inode = btrfs_iget(fs_info->sb, &location, root, NULL);
|
||||||
|
memalloc_nofs_restore(nofs_flag);
|
||||||
if (IS_ERR(inode))
|
if (IS_ERR(inode))
|
||||||
return inode;
|
return inode;
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue