xfs: kill xfs_qmops

Kill the quota ops function vector and replace it with direct calls or
stubs in the CONFIG_XFS_QUOTA=n case.

Make sure we check XFS_IS_QUOTA_RUNNING in the right spots.  We can remove
the number of those checks because the XFS_TRANS_DQ_DIRTY flag can't be set
otherwise.

This brings us back closer to the way this code worked in IRIX and earlier
Linux versions, but we keep a lot of the more useful factoring of common
code.

Eventually we should also kill xfs_qm_bhv.c, but that's left for a later
patch.

Reduces the size of the source code by about 250 lines and the size of
XFS module by about 1.5 kilobytes with quotas enabled:

   text	   data	    bss	    dec	    hex	filename
 615957	   2960	   3848	 622765	  980ad	fs/xfs/xfs.o
 617231	   3152	   3848	 624231	  98667	fs/xfs/xfs.o.old

Fallout:

 - xfs_qm_dqattach is split into xfs_qm_dqattach_locked which expects
   the inode locked and xfs_qm_dqattach which does the locking around it,
   thus removing XFS_QMOPT_ILOCKED.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>

1 files changed, 14 insertions, 8 deletions

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index bb685269f832..0d9b64b219e0 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -405,6 +405,14 @@ xfs_parseargs(
                 return EINVAL;
         }
 
+#ifndef CONFIG_XFS_QUOTA
+        if (XFS_IS_QUOTA_RUNNING(mp)) {
+                cmn_err(CE_WARN,
+                        "XFS: quota support not available in this kernel.");
+                return EINVAL;
+        }
+#endif
+
         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
                 cmn_err(CE_WARN,
@@ -1098,7 +1106,6 @@ xfs_fs_put_super(
         xfs_freesb(mp);
         xfs_icsb_destroy_counters(mp);
         xfs_close_devices(mp);
-        xfs_qmops_put(mp);
         xfs_dmops_put(mp);
         xfs_free_fsname(mp);
         kfree(mp);
@@ -1168,6 +1175,7 @@ xfs_fs_statfs(
 {
         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
         xfs_sb_t                *sbp = &mp->m_sb;
+        struct xfs_inode        *ip = XFS_I(dentry->d_inode);
         __uint64_t              fakeinos, id;
         xfs_extlen_t            lsize;
 
@@ -1196,7 +1204,10 @@ xfs_fs_statfs(
         statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
         spin_unlock(&mp->m_sb_lock);
 
-        XFS_QM_DQSTATVFS(XFS_I(dentry->d_inode), statp);
+        if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
+            ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
+                              (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
+                xfs_qm_statvfs(ip, statp);
         return 0;
 }
 
@@ -1404,16 +1415,13 @@ xfs_fs_fill_super(
         error = xfs_dmops_get(mp);
         if (error)
                 goto out_free_fsname;
-        error = xfs_qmops_get(mp);
-        if (error)
-                goto out_put_dmops;
 
         if (silent)
                 flags |= XFS_MFSI_QUIET;
 
         error = xfs_open_devices(mp);
         if (error)
-                goto out_put_qmops;
+                goto out_put_dmops;
 
         if (xfs_icsb_init_counters(mp))
                 mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
@@ -1482,8 +1490,6 @@ xfs_fs_fill_super(
  out_destroy_counters:
         xfs_icsb_destroy_counters(mp);
         xfs_close_devices(mp);
- out_put_qmops:
-        xfs_qmops_put(mp);
  out_put_dmops:
         xfs_dmops_put(mp);
  out_free_fsname: