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Subject[PATCH 6/9] gfs2: allow quota_check and inplace_reserve to return available blocks
Date
From: Abhi Das <adas@redhat.com>

struct gfs2_alloc_parms is passed to gfs2_quota_check() and
gfs2_inplace_reserve() with ap->target containing the number of
blocks being requested for allocation in the current operation.

We add a new field to struct gfs2_alloc_parms called 'allowed'.
gfs2_quota_check() and gfs2_inplace_reserve() return the max
blocks allowed by quota and the max blocks allowed by the chosen
rgrp respectively in 'allowed'.

A new field 'min_target', when non-zero, tells gfs2_quota_check()
and gfs2_inplace_reserve() to not return -EDQUOT/-ENOSPC when
there are atleast 'min_target' blocks allowable/available. The
assumption is that the caller is ok with just 'min_target' blocks
and will likely proceed with allocating them.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
---
fs/gfs2/incore.h | 2 ++
fs/gfs2/quota.c | 52 +++++++++++++++++++++++++++++++++++++++-------------
fs/gfs2/rgrp.c | 20 +++++++++++++++-----
fs/gfs2/rgrp.h | 3 ++-
4 files changed, 58 insertions(+), 19 deletions(-)

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 3a4ea50..58b75ab 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -302,7 +302,9 @@ struct gfs2_blkreserv {
*/
struct gfs2_alloc_parms {
u64 target;
+ u32 min_target;
u32 aflags;
+ u64 allowed;
};

enum {
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 964a769..5561468 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1094,15 +1094,33 @@ static int print_message(struct gfs2_quota_data *qd, char *type)
return 0;
}

+/**
+ * gfs2_quota_check - check if allocating new blocks will exceed quota
+ * @ip: The inode for which this check is being performed
+ * @uid: The uid to check against
+ * @gid: The gid to check against
+ * @ap: The allocation parameters. ap->target contains the requested
+ * blocks. ap->min_target, if set, contains the minimum blks
+ * requested.
+ *
+ * Returns: 0 on success.
+ * min_req = ap->min_target ? ap->min_target : ap->target;
+ * quota must allow atleast min_req blks for success and
+ * ap->allowed is set to the number of blocks allowed
+ *
+ * -EDQUOT otherwise, quota violation. ap->allowed is set to number
+ * of blocks available.
+ */
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;
- s64 value;
+ s64 value, warn, limit;
unsigned int x;
int error = 0;

+ ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
return 0;

@@ -1116,29 +1134,37 @@ int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
qid_eq(qd->qd_id, make_kqid_gid(gid))))
continue;

+ warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
+ limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
spin_lock(&qd_lock);
- value += qd->qd_change + ap->target;
+ value += qd->qd_change;
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) &&
- (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
+ if (limit > 0 && (limit - value) < ap->allowed)
+ ap->allowed = limit - value;
+ /* If we can't meet the target */
+ if (limit && limit < (value + (s64)ap->target)) {
+ /* If no min_target specified or we don't meet
+ * min_target, return -EDQUOT */
+ if (!ap->min_target || ap->min_target > ap->allowed) {
+ print_message(qd, "exceeded");
+ quota_send_warning(qd->qd_id,
+ sdp->sd_vfs->s_dev,
+ QUOTA_NL_BHARDWARN);
+ error = -EDQUOT;
+ break;
+ }
+ } else if (warn && warn < value &&
time_after_eq(jiffies, qd->qd_last_warn +
- gfs2_tune_get(sdp,
- gt_quota_warn_period) * HZ)) {
+ gfs2_tune_get(sdp, gt_quota_warn_period)
+ * HZ)) {
quota_send_warning(qd->qd_id,
sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
error = print_message(qd, "warning");
qd->qd_last_warn = jiffies;
}
}
-
return error;
}

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 9150207..6af2396 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1946,10 +1946,18 @@ static inline int fast_to_acquire(struct gfs2_rgrpd *rgd)
* @ip: the inode to reserve space for
* @ap: the allocation parameters
*
- * Returns: errno
+ * We try our best to find an rgrp that has at least ap->target blocks
+ * available. After a couple of passes (loops == 2), the prospects of finding
+ * such an rgrp diminish. At this stage, we return the first rgrp that has
+ * atleast ap->min_target blocks available. Either way, we set ap->allowed to
+ * the number of blocks available in the chosen rgrp.
+ *
+ * Returns: 0 on success,
+ * -ENOMEM if a suitable rgrp can't be found
+ * errno otherwise
*/

-int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *ap)
+int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrpd *begin = NULL;
@@ -2012,7 +2020,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *a
/* Skip unuseable resource groups */
if ((rs->rs_rbm.rgd->rd_flags & (GFS2_RGF_NOALLOC |
GFS2_RDF_ERROR)) ||
- (ap->target > rs->rs_rbm.rgd->rd_extfail_pt))
+ (loops == 0 && ap->target > rs->rs_rbm.rgd->rd_extfail_pt))
goto skip_rgrp;

if (sdp->sd_args.ar_rgrplvb)
@@ -2027,11 +2035,13 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *a
goto check_rgrp;

/* If rgrp has enough free space, use it */
- if (rs->rs_rbm.rgd->rd_free_clone >= ap->target) {
+ if (rs->rs_rbm.rgd->rd_free_clone >= ap->target ||
+ (loops == 2 && ap->min_target &&
+ rs->rs_rbm.rgd->rd_free_clone >= ap->min_target)) {
ip->i_rgd = rs->rs_rbm.rgd;
+ ap->allowed = ip->i_rgd->rd_free_clone;
return 0;
}
-
check_rgrp:
/* Check for unlinked inodes which can be reclaimed */
if (rs->rs_rbm.rgd->rd_flags & GFS2_RDF_CHECK)
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index b104f4a..68972ec 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -41,7 +41,8 @@ extern void gfs2_rgrp_go_unlock(struct gfs2_holder *gh);
extern struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);

#define GFS2_AF_ORLOV 1
-extern int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *ap);
+extern int gfs2_inplace_reserve(struct gfs2_inode *ip,
+ struct gfs2_alloc_parms *ap);
extern void gfs2_inplace_release(struct gfs2_inode *ip);

extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
--
1.9.3


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