See what you think of this. Not heavily tested yet, and not pretty... but it
is fairly minimal.
Pull startup and shutdown of the sync worker out of xfs_syncd_init and
xfs_syncd_stop into their callers. In the case of unmount, move shutdown of
the xfs_sync_worker before teardown of the log in xfs_unmountfs. This prevents
occasional crashes on unmount like so:
PID: 21602 TASK: ee9df060 CPU: 0 COMMAND: "kworker/0:3"
#0 [c5377d28] crash_kexec at c0292c94
#1 [c5377d80] oops_end at c07090c2
#2 [c5377d98] no_context at c06f614e
#3 [c5377dbc] __bad_area_nosemaphore at c06f6281
#4 [c5377df4] bad_area_nosemaphore at c06f629b
#5 [c5377e00] do_page_fault at c070b0cb
#6 [c5377e7c] error_code (via page_fault) at c070892c
EAX: f300c6a8 EBX: f300c6a8 ECX: 000000c0 EDX: 000000c0 EBP: c5377ed0
DS: 007b ESI: 00000000 ES: 007b EDI: 00000001 GS: ffffad20
CS: 0060 EIP: c0481ad0 ERR: ffffffff EFLAGS: 00010246
#7 [c5377eb0] atomic64_read_cx8 at c0481ad0
#8 [c5377ebc] xlog_assign_tail_lsn_locked at f7cc7c6e [xfs]
#9 [c5377ed4] xfs_trans_ail_delete_bulk at f7ccd520 [xfs]
#10 [c5377f0c] xfs_buf_iodone at f7ccb602 [xfs]
#11 [c5377f24] xfs_buf_do_callbacks at f7cca524 [xfs]
#12 [c5377f30] xfs_buf_iodone_callbacks at f7cca5da [xfs]
#13 [c5377f4c] xfs_buf_iodone_work at f7c718d0 [xfs]
#14 [c5377f58] process_one_work at c024ee4c
#15 [c5377f98] worker_thread at c024f43d
#16 [c5377fbc] kthread at c025326b
#17 [c5377fe8] kernel_thread_helper at c070e834
PID: 26653 TASK: e79143b0 CPU: 3 COMMAND: "umount"
#0 [cde0fda0] __schedule at c0706595
#1 [cde0fe28] schedule at c0706b89
#2 [cde0fe30] schedule_timeout at c0705600
#3 [cde0fe94] __down_common at c0706098
#4 [cde0fec8] __down at c0706122
#5 [cde0fed0] down at c025936f
#6 [cde0fee0] xfs_buf_lock at f7c7131d [xfs]
#7 [cde0ff00] xfs_freesb at f7cc2236 [xfs]
#8 [cde0ff10] xfs_fs_put_super at f7c80f21 [xfs]
#9 [cde0ff1c] generic_shutdown_super at c0333d7a
#10 [cde0ff38] kill_block_super at c0333e0f
#11 [cde0ff48] deactivate_locked_super at c0334218
#12 [cde0ff58] deactivate_super at c033495d
#13 [cde0ff68] mntput_no_expire at c034bc13
#14 [cde0ff7c] sys_umount at c034cc69
#15 [cde0ffa0] sys_oldumount at c034ccd4
#16 [cde0ffb0] system_call at c0707e66
Signed-off-by: Ben Myers <bpm at sgi.com>
Index: xfs/fs/xfs/xfs_super.c
===================================================================
--- xfs.orig/fs/xfs/xfs_super.c
+++ xfs/fs/xfs/xfs_super.c
@@ -919,6 +919,7 @@ xfs_fs_put_super(
struct xfs_mount *mp = XFS_M(sb);
xfs_filestream_unmount(mp);
+ cancel_delayed_work_sync(&mp->m_sync_work);
xfs_unmountfs(mp);
xfs_syncd_stop(mp);
xfs_freesb(mp);
@@ -1210,6 +1211,9 @@ xfs_finish_flags(
return 0;
}
+extern void xfs_sync_worker(struct work_struct *);
+extern void xfs_syncd_queue_sync(struct xfs_mount *);
+
STATIC int
xfs_fs_fill_super(
struct super_block *sb,
@@ -1291,6 +1295,8 @@ xfs_fs_fill_super(
set_posix_acl_flag(sb);
error = xfs_syncd_init(mp);
+ INIT_DELAYED_WORK(&mp->m_sync_work, xfs_sync_worker);
+ xfs_syncd_queue_sync(mp);
if (error)
goto out_filestream_unmount;
@@ -1315,6 +1321,7 @@ xfs_fs_fill_super(
return 0;
out_syncd_stop:
+ cancel_delayed_work_sync(&mp->m_sync_work);
xfs_syncd_stop(mp);
out_filestream_unmount:
xfs_filestream_unmount(mp);
@@ -1335,6 +1342,7 @@ out_destroy_workqueues:
out_unmount:
xfs_filestream_unmount(mp);
xfs_unmountfs(mp);
+ cancel_delayed_work_sync(&mp->m_sync_work);
xfs_syncd_stop(mp);
goto out_free_sb;
}
Index: xfs/fs/xfs/xfs_sync.c
===================================================================
--- xfs.orig/fs/xfs/xfs_sync.c
+++ xfs/fs/xfs/xfs_sync.c
@@ -370,7 +370,7 @@ xfs_quiesce_attr(
xfs_buf_unlock(mp->m_sb_bp);
}
-static void
+void
xfs_syncd_queue_sync(
struct xfs_mount *mp)
{
@@ -383,7 +383,7 @@ xfs_syncd_queue_sync(
* disk quotas. We might need to cover the log to indicate that the
* filesystem is idle and not frozen.
*/
-STATIC void
+void
xfs_sync_worker(
struct work_struct *work)
{
@@ -494,11 +494,8 @@ xfs_syncd_init(
struct xfs_mount *mp)
{
INIT_WORK(&mp->m_flush_work, xfs_flush_worker);
- INIT_DELAYED_WORK(&mp->m_sync_work, xfs_sync_worker);
INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
- xfs_syncd_queue_sync(mp);
-
return 0;
}
@@ -506,7 +503,6 @@ void
xfs_syncd_stop(
struct xfs_mount *mp)
{
- cancel_delayed_work_sync(&mp->m_sync_work);
cancel_delayed_work_sync(&mp->m_reclaim_work);
cancel_work_sync(&mp->m_flush_work);
}