gfs2: perform quota checks against allocation parameters

Use struct gfs2_alloc_parms as an argument to gfs2_quota_check()
and gfs2_quota_lock_check() to check for quota violations while
accounting for the new blocks requested by the current operation
in ap->target.

Previously, the number of new blocks requested during an operation
were not accounted for during quota_check and would allow these
operations to exceed quota. This was not very apparent since most
operations allocated only 1 block at a time and quotas would get
violated in the next operation. i.e. quota excess would only be by
1 block or so. With fallocate, (where we allocate a bunch of blocks
at once) the quota excess is non-trivial and is addressed by this
patch.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 3aa17d4d1cfc..964a769a7a86 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1094,7 +1094,8 @@ static int print_message(struct gfs2_quota_data *qd, char *type)
         return 0;
 }
 
-int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
+int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
+                     struct gfs2_alloc_parms *ap)
 {
         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
         struct gfs2_quota_data *qd;
@@ -1117,14 +1118,13 @@ int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 
                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
                 spin_lock(&qd_lock);
-                value += qd->qd_change;
+                value += qd->qd_change + ap->target;
                 spin_unlock(&qd_lock);
 
                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
                         print_message(qd, "exceeded");
                         quota_send_warning(qd->qd_id,
                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
-
                         error = -EDQUOT;
                         break;
                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&