Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless

[firefly-linux-kernel-4.4.55.git] / fs / inode.c

diff --git a/fs/inode.c b/fs/inode.c
index c99163b1b31036ef68974c0c5dbc192f8f73f4da..ac8d904b3f1624bfa945ba088d2909e740e16a6c 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -182,7 +182,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
        }
        inode->i_private = NULL;
        inode->i_mapping = mapping;
-       INIT_LIST_HEAD(&inode->i_dentry);       /* buggered by rcu freeing */
+       INIT_HLIST_HEAD(&inode->i_dentry);      /* buggered by rcu freeing */
 #ifdef CONFIG_FS_POSIX_ACL
        inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED;
 #endif
@@ -1542,18 +1542,24 @@ void touch_atime(struct path *path)
        if (timespec_equal(&inode->i_atime, &now))
                return;
 
-       if (mnt_want_write(mnt))
+       if (!sb_start_write_trylock(inode->i_sb))
                return;
 
+       if (__mnt_want_write(mnt))
+               goto skip_update;
        /*
         * File systems can error out when updating inodes if they need to
         * allocate new space to modify an inode (such is the case for
         * Btrfs), but since we touch atime while walking down the path we
         * really don't care if we failed to update the atime of the file,
         * so just ignore the return value.
+        * We may also fail on filesystems that have the ability to make parts
+        * of the fs read only, e.g. subvolumes in Btrfs.
         */
        update_time(inode, &now, S_ATIME);
-       mnt_drop_write(mnt);
+       __mnt_drop_write(mnt);
+skip_update:
+       sb_end_write(inode->i_sb);
 }
 EXPORT_SYMBOL(touch_atime);
 
@@ -1660,11 +1666,11 @@ int file_update_time(struct file *file)
                return 0;
 
        /* Finally allowed to write? Takes lock. */
-       if (mnt_want_write_file(file))
+       if (__mnt_want_write_file(file))
                return 0;
 
        ret = update_time(inode, &now, sync_it);
-       mnt_drop_write_file(file);
+       __mnt_drop_write_file(file);
 
        return ret;
 }