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Date: Tue, 10 Jan 2017 14:38:05 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-xfs@...r.kernel.org,
"Darrick J. Wong" <darrick.wong@...cle.com>,
Christoph Hellwig <hch@....de>
Subject: [PATCH 4.9 202/206] xfs: use the actual AG length when reserving blocks
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Darrick J. Wong" <darrick.wong@...cle.com>
commit 20e73b000bcded44a91b79429d8fa743247602ad upstream.
We need to use the actual AG length when making per-AG reservations,
since we could otherwise end up reserving more blocks out of the last
AG than there are actual blocks.
Complained-about-by: Brian Foster <bfoster@...hat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/xfs/libxfs/xfs_ag_resv.c | 3 +++
fs/xfs/libxfs/xfs_refcount_btree.c | 9 ++++++---
fs/xfs/libxfs/xfs_refcount_btree.h | 3 ++-
fs/xfs/libxfs/xfs_rmap_btree.c | 14 +++++++-------
fs/xfs/libxfs/xfs_rmap_btree.h | 3 ++-
fs/xfs/xfs_fsops.c | 14 ++++++++++++++
6 files changed, 34 insertions(+), 12 deletions(-)
--- a/fs/xfs/libxfs/xfs_ag_resv.c
+++ b/fs/xfs/libxfs/xfs_ag_resv.c
@@ -256,6 +256,9 @@ xfs_ag_resv_init(
goto out;
}
+ ASSERT(xfs_perag_resv(pag, XFS_AG_RESV_METADATA)->ar_reserved +
+ xfs_perag_resv(pag, XFS_AG_RESV_AGFL)->ar_reserved <=
+ pag->pagf_freeblks + pag->pagf_flcount);
out:
return error;
}
--- a/fs/xfs/libxfs/xfs_refcount_btree.c
+++ b/fs/xfs/libxfs/xfs_refcount_btree.c
@@ -408,13 +408,14 @@ xfs_refcountbt_calc_size(
*/
xfs_extlen_t
xfs_refcountbt_max_size(
- struct xfs_mount *mp)
+ struct xfs_mount *mp,
+ xfs_agblock_t agblocks)
{
/* Bail out if we're uninitialized, which can happen in mkfs. */
if (mp->m_refc_mxr[0] == 0)
return 0;
- return xfs_refcountbt_calc_size(mp, mp->m_sb.sb_agblocks);
+ return xfs_refcountbt_calc_size(mp, agblocks);
}
/*
@@ -429,22 +430,24 @@ xfs_refcountbt_calc_reserves(
{
struct xfs_buf *agbp;
struct xfs_agf *agf;
+ xfs_agblock_t agblocks;
xfs_extlen_t tree_len;
int error;
if (!xfs_sb_version_hasreflink(&mp->m_sb))
return 0;
- *ask += xfs_refcountbt_max_size(mp);
error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
if (error)
return error;
agf = XFS_BUF_TO_AGF(agbp);
+ agblocks = be32_to_cpu(agf->agf_length);
tree_len = be32_to_cpu(agf->agf_refcount_blocks);
xfs_buf_relse(agbp);
+ *ask += xfs_refcountbt_max_size(mp, agblocks);
*used += tree_len;
return error;
--- a/fs/xfs/libxfs/xfs_refcount_btree.h
+++ b/fs/xfs/libxfs/xfs_refcount_btree.h
@@ -66,7 +66,8 @@ extern void xfs_refcountbt_compute_maxle
extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
unsigned long long len);
-extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp);
+extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
+ xfs_agblock_t agblocks);
extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
--- a/fs/xfs/libxfs/xfs_rmap_btree.c
+++ b/fs/xfs/libxfs/xfs_rmap_btree.c
@@ -549,13 +549,14 @@ xfs_rmapbt_calc_size(
*/
xfs_extlen_t
xfs_rmapbt_max_size(
- struct xfs_mount *mp)
+ struct xfs_mount *mp,
+ xfs_agblock_t agblocks)
{
/* Bail out if we're uninitialized, which can happen in mkfs. */
if (mp->m_rmap_mxr[0] == 0)
return 0;
- return xfs_rmapbt_calc_size(mp, mp->m_sb.sb_agblocks);
+ return xfs_rmapbt_calc_size(mp, agblocks);
}
/*
@@ -570,25 +571,24 @@ xfs_rmapbt_calc_reserves(
{
struct xfs_buf *agbp;
struct xfs_agf *agf;
- xfs_extlen_t pool_len;
+ xfs_agblock_t agblocks;
xfs_extlen_t tree_len;
int error;
if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
return 0;
- /* Reserve 1% of the AG or enough for 1 block per record. */
- pool_len = max(mp->m_sb.sb_agblocks / 100, xfs_rmapbt_max_size(mp));
- *ask += pool_len;
-
error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
if (error)
return error;
agf = XFS_BUF_TO_AGF(agbp);
+ agblocks = be32_to_cpu(agf->agf_length);
tree_len = be32_to_cpu(agf->agf_rmap_blocks);
xfs_buf_relse(agbp);
+ /* Reserve 1% of the AG or enough for 1 block per record. */
+ *ask += max(agblocks / 100, xfs_rmapbt_max_size(mp, agblocks));
*used += tree_len;
return error;
--- a/fs/xfs/libxfs/xfs_rmap_btree.h
+++ b/fs/xfs/libxfs/xfs_rmap_btree.h
@@ -60,7 +60,8 @@ extern void xfs_rmapbt_compute_maxlevels
extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp,
unsigned long long len);
-extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp);
+extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp,
+ xfs_agblock_t agblocks);
extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp,
xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -631,6 +631,20 @@ xfs_growfs_data_private(
xfs_set_low_space_thresholds(mp);
mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
+ /*
+ * If we expanded the last AG, free the per-AG reservation
+ * so we can reinitialize it with the new size.
+ */
+ if (new) {
+ struct xfs_perag *pag;
+
+ pag = xfs_perag_get(mp, agno);
+ error = xfs_ag_resv_free(pag);
+ xfs_perag_put(pag);
+ if (error)
+ goto out;
+ }
+
/* Reserve AG metadata blocks. */
error = xfs_fs_reserve_ag_blocks(mp);
if (error && error != -ENOSPC)
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