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gfs2: change from write to read lock for sd_log_flush_lock in journal replay

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Function gfs2_recover_func grabs the sd_log_flush_lock rw_semaphore in
write mode. This is unnecessary because we only need to prevent log flush
from using sd_log_bio bio while it does. Therefore, a read lock will be
enough. This is a small step in cleaning up log flush.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Bob Peterson 2020-03-26 12:22:05 -05:00
parent 9592ea80ad
commit c953a735c7
1 changed files with 2 additions and 2 deletions
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4
fs/gfs2/recovery.c
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@ -401,7 +401,7 @@ void gfs2_recover_func(struct work_struct *work)
/* We take the sd_log_flush_lock here primarily to prevent log /* We take the sd_log_flush_lock here primarily to prevent log
* flushes and simultaneous journal replays from stomping on * flushes and simultaneous journal replays from stomping on
* each other wrt sd_log_bio. */ * each other wrt sd_log_bio. */
down_write(&sdp->sd_log_flush_lock); down_read(&sdp->sd_log_flush_lock);
for (pass = 0; pass < 2; pass++) { for (pass = 0; pass < 2; pass++) {
lops_before_scan(jd, &head, pass); lops_before_scan(jd, &head, pass);
error = foreach_descriptor(jd, head.lh_tail, error = foreach_descriptor(jd, head.lh_tail,
@ -412,7 +412,7 @@ void gfs2_recover_func(struct work_struct *work)
} }
clean_journal(jd, &head); clean_journal(jd, &head);
up_write(&sdp->sd_log_flush_lock); up_read(&sdp->sd_log_flush_lock);
gfs2_glock_dq_uninit(&thaw_gh); gfs2_glock_dq_uninit(&thaw_gh);
t_rep = ktime_get(); t_rep = ktime_get();