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GFS2: Implement a "rgrp has no extents longer than X" scheme 

With the preceding patch, we started accepting block reservations
smaller than the ideal size, which requires a lot more parsing of the
bitmaps. To reduce the amount of bitmap searching, this patch
implements a scheme whereby each rgrp keeps track of the point
at this multi-block reservations will fail.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2013-11-25 11:16:25 +00:00 committed by Steven Whitehouse
parent 1330edbeaf
commit 5ea5050cec
3 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/gfs2/incore.h
View File

@ -93,6 +93,7 @@ struct gfs2_rgrpd {
struct gfs2_rgrp_lvb *rd_rgl;
u32 rd_last_alloc;
u32 rd_flags;
u32 rd_extfail_pt; /* extent failure point */
#define GFS2_RDF_CHECK 0x10000000 /* check for unlinked inodes */
#define GFS2_RDF_UPTODATE 0x20000000 /* rg is up to date */
#define GFS2_RDF_ERROR 0x40000000 /* error in rg */

1
fs/gfs2/lops.c
View File

@ -83,6 +83,7 @@ static void maybe_release_space(struct gfs2_bufdata *bd)
bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
clear_bit(GBF_FULL, &bi->bi_flags);
rgd->rd_free_clone = rgd->rd_free;
rgd->rd_extfail_pt = rgd->rd_free;
}
/**

32
fs/gfs2/rgrp.c
View File

@ -641,9 +641,13 @@ static void __rs_deltree(struct gfs2_blkreserv *rs)
/* return reserved blocks to the rgrp */
BUG_ON(rs->rs_rbm.rgd->rd_reserved < rs->rs_free);
rs->rs_rbm.rgd->rd_reserved -= rs->rs_free;
/* The rgrp extent failure point is likely not to increase;
it will only do so if the freed blocks are somehow
contiguous with a span of free blocks that follows. Still,
it will force the number to be recalculated later. */
rgd->rd_extfail_pt += rs->rs_free;
rs->rs_free = 0;
clear_bit(GBF_FULL, &bi->bi_flags);
smp_mb__after_clear_bit();
}
}
@ -1132,6 +1136,8 @@ int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
rgd->rd_free_clone = rgd->rd_free;
/* max out the rgrp allocation failure point */
rgd->rd_extfail_pt = rgd->rd_free;
}
if (cpu_to_be32(GFS2_MAGIC) != rgd->rd_rgl->rl_magic) {
rgd->rd_rgl->rl_unlinked = cpu_to_be32(count_unlinked(rgd));
@ -1593,6 +1599,8 @@ static int gfs2_reservation_check_and_update(struct gfs2_rbm *rbm,
* Side effects:
* - If looking for free blocks, we set GBF_FULL on each bitmap which
* has no free blocks in it.
* - If looking for free blocks, we set rd_extfail_pt on each rgrp which
* has come up short on a free block search.
*
* Returns: 0 on success, -ENOSPC if there is no block of the requested state
*/
@ -1604,6 +1612,8 @@ static int gfs2_rbm_find(struct gfs2_rbm *rbm, u8 state, u32 *minext,
struct buffer_head *bh;
int initial_bii;
u32 initial_offset;
int first_bii = rbm->bii;
u32 first_offset = rbm->offset;
u32 offset;
u8 *buffer;
int n = 0;
@ -1679,6 +1689,13 @@ static int gfs2_rbm_find(struct gfs2_rbm *rbm, u8 state, u32 *minext,
if (minext == NULL || state != GFS2_BLKST_FREE)
return -ENOSPC;
/* If the extent was too small, and it's smaller than the smallest
to have failed before, remember for future reference that it's
useless to search this rgrp again for this amount or more. */
if ((first_offset == 0) && (first_bii == 0) &&
(*minext < rbm->rgd->rd_extfail_pt))
rbm->rgd->rd_extfail_pt = *minext;
/* If the maximum extent we found is big enough to fulfill the
minimum requirements, use it anyway. */
if (maxext.len) {
@ -1924,7 +1941,9 @@ 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))
if ((rs->rs_rbm.rgd->rd_flags & (GFS2_RGF_NOALLOC |
GFS2_RDF_ERROR)) ||
(ap && (ap->target > rs->rs_rbm.rgd->rd_extfail_pt)))
goto skip_rgrp;
if (sdp->sd_args.ar_rgrplvb)
@ -2106,10 +2125,10 @@ int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl)
if (rgd == NULL)
return 0;
gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u r:%u\n",
gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u r:%u e:%u\n",
(unsigned long long)rgd->rd_addr, rgd->rd_flags,
rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes,
rgd->rd_reserved);
rgd->rd_reserved, rgd->rd_extfail_pt);
spin_lock(&rgd->rd_rsspin);
for (n = rb_first(&rgd->rd_rstree); n; n = rb_next(&trs->rs_node)) {
trs = rb_entry(n, struct gfs2_blkreserv, rs_node);
@ -2228,9 +2247,10 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
/* Since all blocks are reserved in advance, this shouldn't happen */
if (error) {
fs_warn(sdp, "inum=%llu error=%d, nblocks=%u, full=%d\n",
fs_warn(sdp, "inum=%llu error=%d, nblocks=%u, full=%d fail_pt=%d\n",
(unsigned long long)ip->i_no_addr, error, *nblocks,
test_bit(GBF_FULL, &rbm.rgd->rd_bits->bi_flags));
test_bit(GBF_FULL, &rbm.rgd->rd_bits->bi_flags),
rbm.rgd->rd_extfail_pt);
goto rgrp_error;
}