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authorAbhijith Das <adas@redhat.com>2011-03-08 18:40:42 +0300
committerSteven Whitehouse <swhiteho@redhat.com>2011-03-09 12:32:44 +0300
commit662e3a551b468c7338f5291d7a00389fe85885e2 (patch)
tree4e4939e0c1f1f5ce66541982476e68f24f83221b /fs/gfs2/quota.c
parent4c16c36ad62fff8485215bd803d778eb2bd0b8bd (diff)
downloadlinux-662e3a551b468c7338f5291d7a00389fe85885e2.tar.xz
GFS2: quota allows exceeding hard limit
Immediately after being synced to disk, cached quotas are zeroed out and a subsequent access of the cached quotas results in incorrect zero values. This meant that gfs2 assumed the actual usage to be the zero (or near-zero) usage values it found in the cached quotas and comparison against warn/limits never triggered a quota violation. This patch adds a new flag QDF_REFRESH that is set after a sync so that the cached quotas are forcefully refreshed from disk on a subsequent access on seeing this flag set. Resolves: rhbz#675944 Signed-off-by: Abhi Das <adas@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/quota.c')
-rw-r--r--fs/gfs2/quota.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 6ec964c31dc6..e23d9864c418 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -834,6 +834,7 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
goto out_end_trans;
do_qc(qd, -qd->qd_change_sync);
+ set_bit(QDF_REFRESH, &qd->qd_flags);
}
error = 0;
@@ -929,6 +930,7 @@ int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_alloc *al = ip->i_alloc;
+ struct gfs2_quota_data *qd;
unsigned int x;
int error = 0;
@@ -942,7 +944,11 @@ int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
sort_qd, NULL);
for (x = 0; x < al->al_qd_num; x++) {
- error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
+ int force = NO_FORCE;
+ qd = al->al_qd[x];
+ if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
+ force = FORCE;
+ error = do_glock(qd, force, &al->al_qd_ghs[x]);
if (error)
break;
}