quota: move remount handling into the filesystem

Currently do_remount_sb calls into the dquot code to tell it about going
from rw to ro and ro to rw.  Move this code into the filesystem to
not depend on the dquot code in the VFS - note ocfs2 already ignores
these calls and handles remount by itself.  This gets rid of overloading
the quotactl calls and allows to unify the VFS and XFS codepaths in
that area later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 14743d935a9..be1f7b05bc2 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -1248,7 +1248,9 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
         struct ufs_super_block_first * usb1;
         struct ufs_super_block_third * usb3;
         unsigned new_mount_opt, ufstype;
+        int enable_quota = 0;
         unsigned flags;
+        int err;
 
         lock_kernel();
         lock_super(sb);
@@ -1289,6 +1291,13 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
          * fs was mouted as rw, remounting ro
          */
         if (*mount_flags & MS_RDONLY) {
+                err = vfs_dq_off(sb, 1);
+                if (err < 0 && err != -ENOSYS) {
+                        unlock_super(sb);
+                        unlock_kernel();
+                        return -EBUSY;
+                }
+
                 ufs_put_super_internal(sb);
                 usb1->fs_time = cpu_to_fs32(sb, get_seconds());
                 if ((flags & UFS_ST_MASK) == UFS_ST_SUN
@@ -1327,11 +1336,14 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
                         return -EPERM;
                 }
                 sb->s_flags &= ~MS_RDONLY;
+                enable_quota = 1;
 #endif
         }
         UFS_SB(sb)->s_mount_opt = new_mount_opt;
         unlock_super(sb);
         unlock_kernel();
+        if (enable_quota)
+                vfs_dq_quota_on_remount(sb);
         return 0;
 }