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authorBrian Foster <bfoster@redhat.com>2021-04-28 15:05:41 -0700
committerDarrick J. Wong <djwong@kernel.org>2021-04-29 07:45:44 -0700
commit2675ad3890db93e58f2264d07c2d1f615ec5adf7 (patch)
tree495fc5c362ab983e8954b9a3a183dfbc48cbeb0c /fs/xfs
parente147a756ab263f9d10eafd08b79b9fac1b08e56c (diff)
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xfs: unconditionally read all AGFs on mounts with perag reservation
perag reservation is enabled at mount time on a per AG basis. The upcoming change to set aside allocbt blocks from block reservation requires a populated allocbt counter as soon as possible after mount to be fully effective against large perag reservations. Therefore as a preparation step, initialize the pagf on all mounts where at least one reservation is active. Note that this already occurs to some degree on most default format filesystems as reservation requirement calculations already depend on the AGF or AGI, depending on the reservation type. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/libxfs/xfs_ag_resv.c34
1 files changed, 23 insertions, 11 deletions
diff --git a/fs/xfs/libxfs/xfs_ag_resv.c b/fs/xfs/libxfs/xfs_ag_resv.c
index 6c5f8d10589c..e32a1833d523 100644
--- a/fs/xfs/libxfs/xfs_ag_resv.c
+++ b/fs/xfs/libxfs/xfs_ag_resv.c
@@ -253,7 +253,8 @@ xfs_ag_resv_init(
xfs_agnumber_t agno = pag->pag_agno;
xfs_extlen_t ask;
xfs_extlen_t used;
- int error = 0;
+ int error = 0, error2;
+ bool has_resv = false;
/* Create the metadata reservation. */
if (pag->pag_meta_resv.ar_asked == 0) {
@@ -291,6 +292,8 @@ xfs_ag_resv_init(
if (error)
goto out;
}
+ if (ask)
+ has_resv = true;
}
/* Create the RMAPBT metadata reservation */
@@ -304,19 +307,28 @@ xfs_ag_resv_init(
error = __xfs_ag_resv_init(pag, XFS_AG_RESV_RMAPBT, ask, used);
if (error)
goto out;
+ if (ask)
+ has_resv = true;
}
-#ifdef DEBUG
- /* need to read in the AGF for the ASSERT below to work */
- error = xfs_alloc_pagf_init(pag->pag_mount, tp, pag->pag_agno, 0);
- if (error)
- return error;
-
- ASSERT(xfs_perag_resv(pag, XFS_AG_RESV_METADATA)->ar_reserved +
- xfs_perag_resv(pag, XFS_AG_RESV_RMAPBT)->ar_reserved <=
- pag->pagf_freeblks + pag->pagf_flcount);
-#endif
out:
+ /*
+ * Initialize the pagf if we have at least one active reservation on the
+ * AG. This may have occurred already via reservation calculation, but
+ * fall back to an explicit init to ensure the in-core allocbt usage
+ * counters are initialized as soon as possible. This is important
+ * because filesystems with large perag reservations are susceptible to
+ * free space reservation problems that the allocbt counter is used to
+ * address.
+ */
+ if (has_resv) {
+ error2 = xfs_alloc_pagf_init(mp, tp, pag->pag_agno, 0);
+ if (error2)
+ return error2;
+ ASSERT(xfs_perag_resv(pag, XFS_AG_RESV_METADATA)->ar_reserved +
+ xfs_perag_resv(pag, XFS_AG_RESV_RMAPBT)->ar_reserved <=
+ pag->pagf_freeblks + pag->pagf_flcount);
+ }
return error;
}