111 lines
3.7 KiB
Diff
111 lines
3.7 KiB
Diff
From ba1a8f18fcb80e3b11a318ad8adf75cd0a750000 Mon Sep 17 00:00:00 2001
|
|
From: Zheng Bin <zhengbin13@huawei.com>
|
|
Date: Wed, 29 Apr 2020 14:10:49 -0400
|
|
Subject: [PATCH 01/16] xfs: add agf freeblocks verify in xfs_agf_verify
|
|
|
|
Source kernel commit: d0c7feaf87678371c2c09b3709400be416b2dc62
|
|
|
|
We recently used fuzz(hydra) to test XFS and automatically generate
|
|
tmp.img(XFS v5 format, but some metadata is wrong)
|
|
|
|
xfs_repair information(just one AG):
|
|
agf_freeblks 0, counted 3224 in ag 0
|
|
agf_longest 536874136, counted 3224 in ag 0
|
|
sb_fdblocks 613, counted 3228
|
|
|
|
Test as follows:
|
|
mount tmp.img tmpdir
|
|
cp file1M tmpdir
|
|
sync
|
|
|
|
In 4.19-stable, sync will stuck, the reason is:
|
|
xfs_mountfs
|
|
xfs_check_summary_counts
|
|
if ((!xfs_sb_version_haslazysbcount(&mp->m_sb) ||
|
|
XFS_LAST_UNMOUNT_WAS_CLEAN(mp)) &&
|
|
!xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS))
|
|
return 0; -->just return, incore sb_fdblocks still be 613
|
|
xfs_initialize_perag_data
|
|
|
|
cp file1M tmpdir -->ok(write file to pagecache)
|
|
sync -->stuck(write pagecache to disk)
|
|
xfs_map_blocks
|
|
xfs_iomap_write_allocate
|
|
while (count_fsb != 0) {
|
|
nimaps = 0;
|
|
while (nimaps == 0) { --> endless loop
|
|
nimaps = 1;
|
|
xfs_bmapi_write(..., &nimaps) --> nimaps becomes 0 again
|
|
xfs_bmapi_write
|
|
xfs_bmap_alloc
|
|
xfs_bmap_btalloc
|
|
xfs_alloc_vextent
|
|
xfs_alloc_fix_freelist
|
|
xfs_alloc_space_available -->fail(agf_freeblks is 0)
|
|
|
|
In linux-next, sync not stuck, cause commit c2b3164320b5 ("xfs:
|
|
use the latest extent at writeback delalloc conversion time") remove
|
|
the above while, dmesg is as follows:
|
|
[ 55.250114] XFS (loop0): page discard on page ffffea0008bc7380, inode 0x1b0c, offset 0.
|
|
|
|
Users do not know why this page is discard, the better soultion is:
|
|
1. Like xfs_repair, make sure sb_fdblocks is equal to counted
|
|
(xfs_initialize_perag_data did this, who is not called at this mount)
|
|
2. Add agf verify, if fail, will tell users to repair
|
|
|
|
This patch use the second soultion.
|
|
|
|
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
|
|
Signed-off-by: Ren Xudong <renxudong1@huawei.com>
|
|
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
|
|
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
|
|
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
|
|
---
|
|
libxfs/xfs_alloc.c | 16 ++++++++++++++++
|
|
1 file changed, 16 insertions(+)
|
|
|
|
diff --git a/libxfs/xfs_alloc.c b/libxfs/xfs_alloc.c
|
|
index a92ca52..09db669 100644
|
|
--- a/libxfs/xfs_alloc.c
|
|
+++ b/libxfs/xfs_alloc.c
|
|
@@ -2854,6 +2854,13 @@ xfs_agf_verify(
|
|
be32_to_cpu(agf->agf_flcount) <= xfs_agfl_size(mp)))
|
|
return __this_address;
|
|
|
|
+ if (be32_to_cpu(agf->agf_length) > mp->m_sb.sb_dblocks)
|
|
+ return __this_address;
|
|
+
|
|
+ if (be32_to_cpu(agf->agf_freeblks) < be32_to_cpu(agf->agf_longest) ||
|
|
+ be32_to_cpu(agf->agf_freeblks) > be32_to_cpu(agf->agf_length))
|
|
+ return __this_address;
|
|
+
|
|
if (be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) < 1 ||
|
|
be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) < 1 ||
|
|
be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) > XFS_BTREE_MAXLEVELS ||
|
|
@@ -2865,6 +2872,10 @@ xfs_agf_verify(
|
|
be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) > XFS_BTREE_MAXLEVELS))
|
|
return __this_address;
|
|
|
|
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb) &&
|
|
+ be32_to_cpu(agf->agf_rmap_blocks) > be32_to_cpu(agf->agf_length))
|
|
+ return __this_address;
|
|
+
|
|
/*
|
|
* during growfs operations, the perag is not fully initialised,
|
|
* so we can't use it for any useful checking. growfs ensures we can't
|
|
@@ -2879,6 +2890,11 @@ xfs_agf_verify(
|
|
return __this_address;
|
|
|
|
if (xfs_sb_version_hasreflink(&mp->m_sb) &&
|
|
+ be32_to_cpu(agf->agf_refcount_blocks) >
|
|
+ be32_to_cpu(agf->agf_length))
|
|
+ return __this_address;
|
|
+
|
|
+ if (xfs_sb_version_hasreflink(&mp->m_sb) &&
|
|
(be32_to_cpu(agf->agf_refcount_level) < 1 ||
|
|
be32_to_cpu(agf->agf_refcount_level) > XFS_BTREE_MAXLEVELS))
|
|
return __this_address;
|
|
--
|
|
1.8.3.1
|
|
|