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gfs2: Make sure we don't miss any delayed withdraws

Browse source 
Commit ca399c96e9 changes gfs2_log_flush to not withdraw the
filesystem while holding the log flush lock, but it fails to check if
the filesystem needs to be withdrawn once the log flush lock has been
released.  Likewise, commit f05b86db31 depends on gfs2_log_flush to
trigger for delayed withdraws.  Add that and clean up the code flow
somewhat.

In gfs2_put_super, add a check for delayed withdraws that have been
missed to prevent these kinds of bugs in the future.

Fixes: ca399c96e9 ("gfs2: flesh out delayed withdraw for gfs2_log_flush")
Fixes: f05b86db31 ("gfs2: Prepare to withdraw as soon as an IO error occurs in log write")
Cc: stable@vger.kernel.org # v5.7+: 462582b99b: gfs2: add some much needed cleanup for log flushes that fail
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2020-08-28 23:44:36 +02:00
parent bbf5c97901
commit 5a61ae1402
3 changed files with 43 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

61
fs/gfs2/log.c
View file

@ -954,10 +954,8 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
goto out;
/* Log might have been flushed while we waited for the flush lock */
if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
up_write(&sdp->sd_log_flush_lock);
return;
}
if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags))
goto out;
trace_gfs2_log_flush(sdp, 1, flags);
if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN)
@ -971,25 +969,25 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
if (unlikely (state == SFS_FROZEN))
if (gfs2_assert_withdraw_delayed(sdp,
!tr->tr_num_buf_new && !tr->tr_num_databuf_new))
goto out;
goto out_withdraw;
}
if (unlikely(state == SFS_FROZEN))
if (gfs2_assert_withdraw_delayed(sdp, !sdp->sd_log_num_revoke))
goto out;
goto out_withdraw;
if (gfs2_assert_withdraw_delayed(sdp,
sdp->sd_log_num_revoke == sdp->sd_log_committed_revoke))
goto out;
goto out_withdraw;
gfs2_ordered_write(sdp);
if (gfs2_withdrawn(sdp))
goto out;
goto out_withdraw;
lops_before_commit(sdp, tr);
if (gfs2_withdrawn(sdp))
goto out;
goto out_withdraw;
gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE);
if (gfs2_withdrawn(sdp))
goto out;
goto out_withdraw;
if (sdp->sd_log_head != sdp->sd_log_flush_head) {
log_flush_wait(sdp);
@ -1000,7 +998,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
log_write_header(sdp, flags);
}
if (gfs2_withdrawn(sdp))
goto out;
goto out_withdraw;
lops_after_commit(sdp, tr);
gfs2_log_lock(sdp);
@ -1020,7 +1018,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
if (!sdp->sd_log_idle) {
empty_ail1_list(sdp);
if (gfs2_withdrawn(sdp))
goto out;
goto out_withdraw;
atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
trace_gfs2_log_blocks(sdp, -1);
log_write_header(sdp, flags);
@ -1033,27 +1031,30 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
}
out:
if (gfs2_withdrawn(sdp)) {
trans_drain(tr);
/**
* If the tr_list is empty, we're withdrawing during a log
* flush that targets a transaction, but the transaction was
* never queued onto any of the ail lists. Here we add it to
* ail1 just so that ail_drain() will find and free it.
*/
spin_lock(&sdp->sd_ail_lock);
if (tr && list_empty(&tr->tr_list))
list_add(&tr->tr_list, &sdp->sd_ail1_list);
spin_unlock(&sdp->sd_ail_lock);
ail_drain(sdp); /* frees all transactions */
tr = NULL;
}
out_end:
trace_gfs2_log_flush(sdp, 0, flags);
out:
up_write(&sdp->sd_log_flush_lock);
gfs2_trans_free(sdp, tr);
if (gfs2_withdrawing(sdp))
gfs2_withdraw(sdp);
return;
out_withdraw:
trans_drain(tr);
/**
* If the tr_list is empty, we're withdrawing during a log
* flush that targets a transaction, but the transaction was
* never queued onto any of the ail lists. Here we add it to
* ail1 just so that ail_drain() will find and free it.
*/
spin_lock(&sdp->sd_ail_lock);
if (tr && list_empty(&tr->tr_list))
list_add(&tr->tr_list, &sdp->sd_ail1_list);
spin_unlock(&sdp->sd_ail_lock);
ail_drain(sdp); /* frees all transactions */
tr = NULL;
goto out_end;
}
/**

2
fs/gfs2/super.c
View file

@ -702,6 +702,8 @@ static void gfs2_put_super(struct super_block *sb)
if (error)
gfs2_io_error(sdp);
}
WARN_ON(gfs2_withdrawing(sdp));
/* At this point, we're through modifying the disk */
/* Release stuff */

10
fs/gfs2/util.h
View file

@ -205,6 +205,16 @@ static inline bool gfs2_withdrawn(struct gfs2_sbd *sdp)
test_bit(SDF_WITHDRAWING, &sdp->sd_flags);
}
/**
* gfs2_withdrawing - check if a withdraw is pending
* @sdp: the superblock
*/
static inline bool gfs2_withdrawing(struct gfs2_sbd *sdp)
{
return test_bit(SDF_WITHDRAWING, &sdp->sd_flags) &&
!test_bit(SDF_WITHDRAWN, &sdp->sd_flags);
}
#define gfs2_tune_get(sdp, field) \
gfs2_tune_get_i(&(sdp)->sd_tune, &(sdp)->sd_tune.field)