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| author | Filipe Manana <fdmanana@suse.com> | 2018-12-13 21:16:56 +0000 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-02-25 14:13:17 +0100 |
| commit | a0873490660246db587849a9e172f2b7b21fa88a (patch) | |
| tree | ff19cf14a965fd30576f37ced859a19856d0f79a | |
| parent | b89f6d1fcb30a8cbdc18ce00c7d93792076af453 (diff) | |
| download | linux-stable-a0873490660246db587849a9e172f2b7b21fa88a.tar.gz linux-stable-a0873490660246db587849a9e172f2b7b21fa88a.tar.bz2 linux-stable-a0873490660246db587849a9e172f2b7b21fa88a.zip | |
Btrfs: setup a nofs context for memory allocation at __btrfs_set_acl
We are holding a transaction handle when setting an acl, therefore we can
not allocate the xattr value buffer using GFP_KERNEL, as we could deadlock
if reclaim is triggered by the allocation, therefore setup a nofs context.
Fixes: 39a27ec1004e8 ("btrfs: use GFP_KERNEL for xattr and acl allocations")
CC: stable@vger.kernel.org # 4.9+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/acl.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index 3b66c957ea6f..5810463dc6d2 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -9,6 +9,7 @@ #include <linux/posix_acl_xattr.h> #include <linux/posix_acl.h> #include <linux/sched.h> +#include <linux/sched/mm.h> #include <linux/slab.h> #include "ctree.h" @@ -72,8 +73,16 @@ static int __btrfs_set_acl(struct btrfs_trans_handle *trans, } if (acl) { + unsigned int nofs_flag; + size = posix_acl_xattr_size(acl->a_count); + /* + * We're holding a transaction handle, so use a NOFS memory + * allocation context to avoid deadlock if reclaim happens. + */ + nofs_flag = memalloc_nofs_save(); value = kmalloc(size, GFP_KERNEL); + memalloc_nofs_restore(nofs_flag); if (!value) { ret = -ENOMEM; goto out; |