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xfs: track delayed allocation reservations across the filesystem

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Add a percpu counter to track the number of blocks directly reserved for
delayed allocations on the data device.  This counter (in contrast to
i_delayed_blks) does not track allocated CoW staging extents or anything
going on with the realtime device.  It will be used in the upcoming
summary counter scrub function to check the free block counts without
having to freeze the filesystem or walk all the inodes to find the
delayed allocations.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
2019-04-25 18:26:22 -07:00
parent f60be90fc9
commit 9fe82b8c42
4 changed files with 51 additions and 3 deletions
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17
fs/xfs/libxfs/xfs_bmap.c
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@@ -2009,6 +2009,9 @@ xfs_bmap_add_extent_delay_real(
goto done;
}
if (da_new != da_old)
xfs_mod_delalloc(mp, (int64_t)da_new - da_old);
if (bma->cur) {
da_new += bma->cur->bc_private.b.allocated;
bma->cur->bc_private.b.allocated = 0;
@@ -2640,6 +2643,7 @@ xfs_bmap_add_extent_hole_delay(
/*
* Nothing to do for disk quota accounting here.
*/
xfs_mod_delalloc(ip->i_mount, (int64_t)newlen - oldlen);
}
}
@@ -3352,8 +3356,10 @@ xfs_bmap_btalloc_accounting(
* already have quota reservation and there's nothing to do
* yet.
*/
if (ap->wasdel)
if (ap->wasdel) {
xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
return;
}
/*
* Otherwise, we've allocated blocks in a hole. The transaction
@@ -3372,8 +3378,10 @@ xfs_bmap_btalloc_accounting(
/* data/attr fork only */
ap->ip->i_d.di_nblocks += args->len;
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
if (ap->wasdel)
if (ap->wasdel) {
ap->ip->i_delayed_blks -= args->len;
xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
}
xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT : XFS_TRANS_DQ_BCOUNT,
args->len);
@@ -3969,6 +3977,7 @@ xfs_bmapi_reserve_delalloc(
ip->i_delayed_blks += alen;
xfs_mod_delalloc(ip->i_mount, alen + indlen);
got->br_startoff = aoff;
got->br_startblock = nullstartblock(indlen);
@@ -4840,8 +4849,10 @@ xfs_bmap_del_extent_delay(
da_diff = da_old - da_new;
if (!isrt)
da_diff += del->br_blockcount;
if (da_diff)
if (da_diff) {
xfs_mod_fdblocks(mp, da_diff, false);
xfs_mod_delalloc(mp, -da_diff);
}
return error;
}