Btrfs: use nofs context when initializing security xattrs to avoid deadlock

[sfrench/cifs-2.6.git] / fs / btrfs / xattr.c

diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index ea78c3d6dcfce739bec5cec02466555f680716e4..f141b45ce349848f7793e9bf509f21d958e5852b 100644 (file)
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -11,6 +11,7 @@
 #include <linux/security.h>
 #include <linux/posix_acl_xattr.h>
 #include <linux/iversion.h>
+#include <linux/sched/mm.h>
 #include "ctree.h"
 #include "btrfs_inode.h"
 #include "transaction.h"
@@ -422,9 +423,15 @@ static int btrfs_initxattrs(struct inode *inode,
 {
        const struct xattr *xattr;
        struct btrfs_trans_handle *trans = fs_info;
+       unsigned int nofs_flag;
        char *name;
        int err = 0;
 
+       /*
+        * We're holding a transaction handle, so use a NOFS memory allocation
+        * context to avoid deadlock if reclaim happens.
+        */
+       nofs_flag = memalloc_nofs_save();
        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
                name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
                               strlen(xattr->name) + 1, GFP_KERNEL);
@@ -440,6 +447,7 @@ static int btrfs_initxattrs(struct inode *inode,
                if (err < 0)
                        break;
        }
+       memalloc_nofs_restore(nofs_flag);
        return err;
 }