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gfs2: allow quota_check and inplace_reserve to return available blocks

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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>
This commit is contained in:
Abhi Das
2015-03-18 12:04:37 -05:00
committed by Bob Peterson
parent b8fbf471ed
commit 25435e5ed6
4 changed files with 58 additions and 19 deletions
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20
fs/gfs2/rgrp.c
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@@ -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)