xfs: implement quota warnings via netlink

Wire up quota_send_warning to send quota warnings over netlink.
This is used by various desktops to show user quota warnings.

Tested by running the quota_nld daemon while running the xfstest
quota tests and observing the warnings.  I'll see how I can get a
more formal testcase for it written.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/quota/xfs_trans_dquot.c b/fs/xfs/quota/xfs_trans_dquot.c
index b9db6f781cd69f2476b34816317ea3d139b45f20..c3ab75cb1d9aaea549dfc6da0fb207f5f3bf31bc 100644 (file)
--- a/fs/xfs/quota/xfs_trans_dquot.c
+++ b/fs/xfs/quota/xfs_trans_dquot.c
@@ -589,6 +589,20 @@ xfs_trans_unreserve_and_mod_dquots(
        }
 }
 
+STATIC void
+xfs_quota_warn(
+       struct xfs_mount        *mp,
+       struct xfs_dquot        *dqp,
+       int                     type)
+{
+       /* no warnings for project quotas - we just return ENOSPC later */
+       if (dqp->dq_flags & XFS_DQ_PROJ)
+               return;
+       quota_send_warning((dqp->dq_flags & XFS_DQ_USER) ? USRQUOTA : GRPQUOTA,
+                          be32_to_cpu(dqp->q_core.d_id), mp->m_super->s_dev,
+                          type);
+}
+
 /*
  * This reserves disk blocks and inodes against a dquot.
  * Flags indicate if the dquot is to be locked here and also
@@ -657,13 +671,21 @@ xfs_trans_dqresv(
                         * nblks.
                         */
                        if (hardlimit > 0ULL &&
-                           hardlimit <= nblks + *resbcountp)
+                           hardlimit <= nblks + *resbcountp) {
+                               xfs_quota_warn(mp, dqp, QUOTA_NL_BHARDWARN);
                                goto error_return;
+                       }
                        if (softlimit > 0ULL &&
-                           softlimit <= nblks + *resbcountp &&
-                           ((timer != 0 && get_seconds() > timer) ||
-                            (warns != 0 && warns >= warnlimit)))
-                               goto error_return;
+                           softlimit <= nblks + *resbcountp) {
+                               if ((timer != 0 && get_seconds() > timer) ||
+                                   (warns != 0 && warns >= warnlimit)) {
+                                       xfs_quota_warn(mp, dqp,
+                                                      QUOTA_NL_BSOFTLONGWARN);
+                                       goto error_return;
+                               }
+
+                               xfs_quota_warn(mp, dqp, QUOTA_NL_BSOFTWARN);
+                       }
                }
                if (ninos > 0) {
                        count = be64_to_cpu(dqp->q_core.d_icount);
@@ -677,12 +699,19 @@ xfs_trans_dqresv(
                        if (!softlimit)
                                softlimit = q->qi_isoftlimit;
 
-                       if (hardlimit > 0ULL && count >= hardlimit)
-                               goto error_return;
-                       if (softlimit > 0ULL && count >= softlimit &&
-                           ((timer != 0 && get_seconds() > timer) ||
-                            (warns != 0 && warns >= warnlimit)))
+                       if (hardlimit > 0ULL && count >= hardlimit) {
+                               xfs_quota_warn(mp, dqp, QUOTA_NL_IHARDWARN);
                                goto error_return;
+                       }
+                       if (softlimit > 0ULL && count >= softlimit) {
+                               if  ((timer != 0 && get_seconds() > timer) ||
+                                    (warns != 0 && warns >= warnlimit)) {
+                                       xfs_quota_warn(mp, dqp,
+                                                      QUOTA_NL_ISOFTLONGWARN);
+                                       goto error_return;
+                               }
+                               xfs_quota_warn(mp, dqp, QUOTA_NL_ISOFTWARN);
+                       }
                }
        }