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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>
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parent
9ce0f8b6fb
commit
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1 changed files with 8 additions and 0 deletions
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@ -22,6 +22,7 @@
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#include <linux/slab.h>
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#include <linux/math64.h>
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#include <linux/ratelimit.h>
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#include <linux/sched/mm.h>
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#include "ctree.h"
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#include "free-space-cache.h"
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#include "transaction.h"
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@ -59,6 +60,7 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
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struct btrfs_free_space_header *header;
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struct extent_buffer *leaf;
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struct inode *inode = NULL;
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unsigned nofs_flag;
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int ret;
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key.objectid = BTRFS_FREE_SPACE_OBJECTID;
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@ -80,7 +82,13 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
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btrfs_disk_key_to_cpu(&location, &disk_key);
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btrfs_release_path(path);
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/*
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* We are often under a trans handle at this point, so we need to make
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* sure NOFS is set to keep us from deadlocking.
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*/
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nofs_flag = memalloc_nofs_save();
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inode = btrfs_iget(fs_info->sb, &location, root, NULL);
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memalloc_nofs_restore(nofs_flag);
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if (IS_ERR(inode))
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return inode;
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if (is_bad_inode(inode)) {
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