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xfs: fix fdblocks accounting w/ RMAPBT per-AG reservation

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In __xfs_ag_resv_init we incorrectly calculate the amount by which to
decrease fdblocks when reserving blocks for the rmapbt.  Because rmapbt
allocations do not decrease fdblocks, we must decrease fdblocks by the
entire size of the requested reservation in order to achieve our goal of
always having enough free blocks to satisfy an rmapbt expansion.

This is in contrast to the refcountbt/finobt, which /do/ subtract from
fdblocks whenever they allocate a block.  For this allocation type we
preserve the existing behavior where we decrease fdblocks only by the
requested reservation minus the size of the existing tree.

This fixes the problem where the available block counts reported by
statfs change across a remount if there had been an rmapbt size change
since mount time.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
This commit is contained in:
Darrick J. Wong 2018-06-21 23:26:56 -07:00
parent e53c4b5983
commit d8cb5e4237
1 changed files with 27 additions and 4 deletions
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31
fs/xfs/libxfs/xfs_ag_resv.c
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@ -157,6 +157,7 @@ __xfs_ag_resv_free(
error = xfs_mod_fdblocks(pag->pag_mount, oldresv, true);
resv->ar_reserved = 0;
resv->ar_asked = 0;
resv->ar_orig_reserved = 0;
if (error)
trace_xfs_ag_resv_free_error(pag->pag_mount, pag->pag_agno,
@ -189,13 +190,34 @@ __xfs_ag_resv_init(
struct xfs_mount *mp = pag->pag_mount;
struct xfs_ag_resv *resv;
int error;
xfs_extlen_t reserved;
xfs_extlen_t hidden_space;
if (used > ask)
ask = used;
reserved = ask - used;
error = xfs_mod_fdblocks(mp, -(int64_t)reserved, true);
switch (type) {
case XFS_AG_RESV_RMAPBT:
/*
* Space taken by the rmapbt is not subtracted from fdblocks
* because the rmapbt lives in the free space. Here we must
* subtract the entire reservation from fdblocks so that we
* always have blocks available for rmapbt expansion.
*/
hidden_space = ask;
break;
case XFS_AG_RESV_METADATA:
/*
* Space taken by all other metadata btrees are accounted
* on-disk as used space. We therefore only hide the space
* that is reserved but not used by the trees.
*/
hidden_space = ask - used;
break;
default:
ASSERT(0);
return -EINVAL;
}
error = xfs_mod_fdblocks(mp, -(int64_t)hidden_space, true);
if (error) {
trace_xfs_ag_resv_init_error(pag->pag_mount, pag->pag_agno,
error, _RET_IP_);
@ -216,7 +238,8 @@ __xfs_ag_resv_init(
resv = xfs_perag_resv(pag, type);
resv->ar_asked = ask;
resv->ar_reserved = resv->ar_orig_reserved = reserved;
resv->ar_orig_reserved = hidden_space;
resv->ar_reserved = ask - used;
trace_xfs_ag_resv_init(pag, type, ask);
return 0;