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xfs: prohibit fs freezing when using empty transactions 

I noticed that fsfreeze can take a very long time to freeze an XFS if
there happens to be a GETFSMAP caller running in the background.  I also
happened to notice the following in dmesg:

------------[ cut here ]------------
WARNING: CPU: 2 PID: 43492 at fs/xfs/xfs_super.c:853 xfs_quiesce_attr+0x83/0x90 [xfs]
Modules linked in: xfs libcrc32c ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 ip_set_hash_ip ip_set_hash_net xt_tcpudp xt_set ip_set_hash_mac ip_set nfnetlink ip6table_filter ip6_tables bfq iptable_filter sch_fq_codel ip_tables x_tables nfsv4 af_packet [last unloaded: xfs]
CPU: 2 PID: 43492 Comm: xfs_io Not tainted 5.6.0-rc4-djw #rc4
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.10.2-1ubuntu1 04/01/2014
RIP: 0010:xfs_quiesce_attr+0x83/0x90 [xfs]
Code: 7c 07 00 00 85 c0 75 22 48 89 df 5b e9 96 c1 00 00 48 c7 c6 b0 2d 38 a0 48 89 df e8 57 64 ff ff 8b 83 7c 07 00 00 85 c0 74 de <0f> 0b 48 89 df 5b e9 72 c1 00 00 66 90 0f 1f 44 00 00 41 55 41 54
RSP: 0018:ffffc900030f3e28 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff88802ac54000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81e4a6f0 RDI: 00000000ffffffff
RBP: ffff88807859f070 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000010 R12: 0000000000000000
R13: ffff88807859f388 R14: ffff88807859f4b8 R15: ffff88807859f5e8
FS:  00007fad1c6c0fc0(0000) GS:ffff88807e000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c7d237000 CR3: 0000000077f01003 CR4: 00000000001606a0
Call Trace:
 xfs_fs_freeze+0x25/0x40 [xfs]
 freeze_super+0xc8/0x180
 do_vfs_ioctl+0x70b/0x750
 ? __fget_files+0x135/0x210
 ksys_ioctl+0x3a/0xb0
 __x64_sys_ioctl+0x16/0x20
 do_syscall_64+0x50/0x1a0
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

These two things appear to be related.  The assertion trips when another
thread initiates a fsmap request (which uses an empty transaction) after
the freezer waited for m_active_trans to hit zero but before the the
freezer executes the WARN_ON just prior to calling xfs_log_quiesce.

The lengthy delays in freezing happen because the freezer calls
xfs_wait_buftarg to clean out the buffer lru list.  Meanwhile, the
GETFSMAP caller is continuing to grab and release buffers, which means
that it can take a very long time for the buffer lru list to empty out.

We fix both of these races by calling sb_start_write to obtain freeze
protection while using empty transactions for GETFSMAP and for metadata
scrubbing.  The other two users occur during mount, during which time we
cannot fs freeze.

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 2020-03-24 23:03:24 -07:00
parent 842a42d126
commit 27fb5a72f5
3 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/xfs/scrub/scrub.c
View File

@ -168,6 +168,7 @@ xchk_teardown(
xfs_irele(sc->ip);
sc->ip = NULL;
}
sb_end_write(sc->mp->m_super);
if (sc->flags & XCHK_REAPING_DISABLED)
xchk_start_reaping(sc);
if (sc->flags & XCHK_HAS_QUOTAOFFLOCK) {
@ -490,6 +491,14 @@ xfs_scrub_metadata(
sc.ops = &meta_scrub_ops[sm->sm_type];
sc.sick_mask = xchk_health_mask_for_scrub_type(sm->sm_type);
retry_op:
/*
* If freeze runs concurrently with a scrub, the freeze can be delayed
* indefinitely as we walk the filesystem and iterate over metadata
* buffers. Freeze quiesces the log (which waits for the buffer LRU to
* be emptied) and that won't happen while checking is running.
*/
sb_start_write(mp->m_super);
/* Set up for the operation. */
error = sc.ops->setup(&sc, ip);
if (error)

9
fs/xfs/xfs_fsmap.c
View File

@ -896,6 +896,14 @@ xfs_getfsmap(
info.format_arg = arg;
info.head = head;
/*
* If fsmap runs concurrently with a scrub, the freeze can be delayed
* indefinitely as we walk the rmapbt and iterate over metadata
* buffers. Freeze quiesces the log (which waits for the buffer LRU to
* be emptied) and that won't happen while we're reading buffers.
*/
sb_start_write(mp->m_super);
/* For each device we support... */
for (i = 0; i < XFS_GETFSMAP_DEVS; i++) {
/* Is this device within the range the user asked for? */
@ -935,6 +943,7 @@ xfs_getfsmap(
if (tp)
xfs_trans_cancel(tp);
sb_end_write(mp->m_super);
head->fmh_oflags = FMH_OF_DEV_T;
return error;
}

5
fs/xfs/xfs_trans.c
View File

@ -306,6 +306,11 @@ xfs_trans_alloc(
*
* Note the zero-length reservation; this transaction MUST be cancelled
* without any dirty data.
*
* Callers should obtain freeze protection to avoid two conflicts with fs
* freezing: (1) having active transactions trip the m_active_trans ASSERTs;
* and (2) grabbing buffers at the same time that freeze is trying to drain
* the buffer LRU list.
*/
int
xfs_trans_alloc_empty(