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gfs2: Get rid of current_tail()
Keep the current value of the updated log tail in the super block as sb_log_flush_tail instead of computing it on the fly. This avoids unnecessary sd_ail_lock taking and cleans up the code. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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297de3180d
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@ -838,8 +838,6 @@ struct gfs2_sbd {
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wait_queue_head_t sd_logd_waitq;
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u64 sd_log_sequence;
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unsigned int sd_log_head;
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unsigned int sd_log_tail;
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int sd_log_idle;
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struct rw_semaphore sd_log_flush_lock;
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@ -849,6 +847,9 @@ struct gfs2_sbd {
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int sd_log_error; /* First log error */
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wait_queue_head_t sd_withdraw_wait;
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unsigned int sd_log_tail;
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unsigned int sd_log_flush_tail;
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unsigned int sd_log_head;
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unsigned int sd_log_flush_head;
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spinlock_t sd_ail_lock;
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@ -242,6 +242,28 @@ static void gfs2_ail1_start(struct gfs2_sbd *sdp)
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return gfs2_ail1_flush(sdp, &wbc);
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}
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static void gfs2_log_update_flush_tail(struct gfs2_sbd *sdp)
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{
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unsigned int new_flush_tail = sdp->sd_log_head;
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struct gfs2_trans *tr;
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if (!list_empty(&sdp->sd_ail1_list)) {
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tr = list_last_entry(&sdp->sd_ail1_list,
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struct gfs2_trans, tr_list);
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new_flush_tail = tr->tr_first;
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}
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sdp->sd_log_flush_tail = new_flush_tail;
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}
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static void gfs2_log_update_head(struct gfs2_sbd *sdp)
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{
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unsigned int new_head = sdp->sd_log_flush_head;
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if (sdp->sd_log_flush_tail == sdp->sd_log_head)
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sdp->sd_log_flush_tail = new_head;
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sdp->sd_log_head = new_head;
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}
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/**
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* gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
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* @sdp: the filesystem
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@ -317,6 +339,7 @@ static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int max_revokes)
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else
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oldest_tr = 0;
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}
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gfs2_log_update_flush_tail(sdp);
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ret = list_empty(&sdp->sd_ail1_list);
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spin_unlock(&sdp->sd_ail_lock);
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@ -544,30 +567,14 @@ static unsigned int calc_reserved(struct gfs2_sbd *sdp)
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return reserved;
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}
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static unsigned int current_tail(struct gfs2_sbd *sdp)
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static void log_pull_tail(struct gfs2_sbd *sdp)
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{
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struct gfs2_trans *tr;
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unsigned int tail;
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spin_lock(&sdp->sd_ail_lock);
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if (list_empty(&sdp->sd_ail1_list)) {
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tail = sdp->sd_log_head;
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} else {
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tr = list_last_entry(&sdp->sd_ail1_list, struct gfs2_trans,
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tr_list);
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tail = tr->tr_first;
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}
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spin_unlock(&sdp->sd_ail_lock);
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return tail;
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}
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static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
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{
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unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
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unsigned int new_tail = sdp->sd_log_flush_tail;
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unsigned int dist;
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if (new_tail == sdp->sd_log_tail)
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return;
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dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
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ail2_empty(sdp, new_tail);
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gfs2_log_release(sdp, dist);
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sdp->sd_log_tail = new_tail;
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@ -822,26 +829,23 @@ void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
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static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
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{
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unsigned int tail;
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int op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC;
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enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
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gfs2_assert_withdraw(sdp, (state != SFS_FROZEN));
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tail = current_tail(sdp);
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if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
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gfs2_ordered_wait(sdp);
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log_flush_wait(sdp);
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op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
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}
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sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
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gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, tail,
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sdp->sd_log_flush_head, flags, op_flags);
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sdp->sd_log_idle = (sdp->sd_log_flush_tail == sdp->sd_log_flush_head);
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gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++,
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sdp->sd_log_flush_tail, sdp->sd_log_flush_head,
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flags, op_flags);
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gfs2_log_incr_head(sdp);
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log_flush_wait(sdp);
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if (sdp->sd_log_tail != tail)
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log_pull_tail(sdp, tail);
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log_pull_tail(sdp);
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}
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/**
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@ -991,7 +995,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
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if (sdp->sd_log_head != sdp->sd_log_flush_head) {
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log_flush_wait(sdp);
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log_write_header(sdp, flags);
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} else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) {
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} else if (sdp->sd_log_tail != sdp->sd_log_flush_tail && !sdp->sd_log_idle) {
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atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
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trace_gfs2_log_blocks(sdp, -1);
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log_write_header(sdp, flags);
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@ -1001,7 +1005,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
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lops_after_commit(sdp, tr);
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gfs2_log_lock(sdp);
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sdp->sd_log_head = sdp->sd_log_flush_head;
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gfs2_log_update_head(sdp);
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sdp->sd_log_blks_reserved = 0;
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sdp->sd_log_committed_revoke = 0;
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@ -1021,7 +1025,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
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atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
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trace_gfs2_log_blocks(sdp, -1);
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log_write_header(sdp, flags);
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sdp->sd_log_head = sdp->sd_log_flush_head;
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gfs2_log_update_head(sdp);
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}
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if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
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GFS2_LOG_HEAD_FLUSH_FREEZE))
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@ -1156,7 +1160,7 @@ static void gfs2_log_shutdown(struct gfs2_sbd *sdp)
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gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
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gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
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sdp->sd_log_head = sdp->sd_log_flush_head;
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gfs2_log_update_head(sdp);
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sdp->sd_log_tail = sdp->sd_log_head;
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}
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@ -43,7 +43,9 @@ static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
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if (++value == sdp->sd_jdesc->jd_blocks) {
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value = 0;
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}
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sdp->sd_log_head = sdp->sd_log_tail = value;
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sdp->sd_log_tail = value;
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sdp->sd_log_flush_tail = value;
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sdp->sd_log_head = value;
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}
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static inline void gfs2_ordered_add_inode(struct gfs2_inode *ip)
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