xfs: cleanup quota check on disk blocks and inodes reservations

This patch is a cleanup of quota check on disk blocks and inodes
reservations, and changes it as follows.

(1) add a total_count variable to store the total number of
    current usages and new reservations for disk blocks and inodes,
    respectively.

(2) make it more readable to check if the local variables softlimit
    and hardlimit are positive. It has been changed as follows.
	    if (softlimit > 0ULL) -> if (softlimit)
	    if (hardlimit > 0ULL) -> if (hardlimit)
    This is because they are defined as xfs_qcnt_t which is unsigned.

Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Cc: Ben Myers <bpm@sgi.com>
Cc: Alex Elder <elder@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c
index c4ba366d24e6..877fe6367d2d 100644
--- a/fs/xfs/xfs_trans_dquot.c
+++ b/fs/xfs/xfs_trans_dquot.c
@@ -605,7 +605,7 @@ xfs_trans_dqresv(
         time_t          timer;
         xfs_qwarncnt_t  warns;
         xfs_qwarncnt_t  warnlimit;
-        xfs_qcnt_t      count;
+        xfs_qcnt_t      total_count;
         xfs_qcnt_t      *resbcountp;
         xfs_quotainfo_t *q = mp->m_quotainfo;
 
@@ -648,13 +648,12 @@ xfs_trans_dqresv(
                          * hardlimit or exceed the timelimit if we allocate
                          * nblks.
                          */
-                        if (hardlimit > 0ULL &&
-                            hardlimit < nblks + *resbcountp) {
+                        total_count = *resbcountp + nblks;
+                        if (hardlimit && total_count > hardlimit) {
                                 xfs_quota_warn(mp, dqp, QUOTA_NL_BHARDWARN);
                                 goto error_return;
                         }
-                        if (softlimit > 0ULL &&
-                            softlimit < nblks + *resbcountp) {
+                        if (softlimit && total_count > softlimit) {
                                 if ((timer != 0 && get_seconds() > timer) ||
                                     (warns != 0 && warns >= warnlimit)) {
                                         xfs_quota_warn(mp, dqp,
@@ -666,7 +665,7 @@ xfs_trans_dqresv(
                         }
                 }
                 if (ninos > 0) {
-                        count = be64_to_cpu(dqp->q_core.d_icount);
+                        total_count = be64_to_cpu(dqp->q_core.d_icount) + ninos;
                         timer = be32_to_cpu(dqp->q_core.d_itimer);
                         warns = be16_to_cpu(dqp->q_core.d_iwarns);
                         warnlimit = dqp->q_mount->m_quotainfo->qi_iwarnlimit;
@@ -677,13 +676,11 @@ xfs_trans_dqresv(
                         if (!softlimit)
                                 softlimit = q->qi_isoftlimit;
 
-                        if (hardlimit > 0ULL &&
-                            hardlimit < ninos + count) {
+                        if (hardlimit && total_count > hardlimit) {
                                 xfs_quota_warn(mp, dqp, QUOTA_NL_IHARDWARN);
                                 goto error_return;
                         }
-                        if (softlimit > 0ULL &&
-                            softlimit < ninos + count) {
+                        if (softlimit && total_count > softlimit) {
                                 if  ((timer != 0 && get_seconds() > timer) ||
                                      (warns != 0 && warns >= warnlimit)) {
                                         xfs_quota_warn(mp, dqp,