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| author | Abhijith Das <adas@redhat.com> | 2011-03-08 16:40:42 +0100 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2011-03-09 10:32:44 +0100 |
| commit | 662e3a551b468c7338f5291d7a00389fe85885e2 (patch) | |
| tree | 4e4939e0c1f1f5ce66541982476e68f24f83221b /fs/gfs2/quota.c | |
| parent | GFS2: deallocation performance patch (diff) | |
| download | linux-662e3a551b468c7338f5291d7a00389fe85885e2.tar.xz linux-662e3a551b468c7338f5291d7a00389fe85885e2.zip | |
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.c | 8 |
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; } |