xfs: add the xlog_grant_head structure

Add a new data structure to allow sharing code between the log grant and
regrant code.

Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 02a35fb..ad0cac3 100644 (file)
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -158,7 +158,7 @@ xlog_reserveq_wake(
        struct xlog_ticket      *tic;
        int                     need_bytes;
 
-       list_for_each_entry(tic, &log->l_reserveq, t_queue) {
+       list_for_each_entry(tic, &log->l_reserve_head.waiters, t_queue) {
                if (tic->t_flags & XLOG_TIC_PERM_RESERV)
                        need_bytes = tic->t_unit_res * tic->t_cnt;
                else
@@ -183,7 +183,7 @@ xlog_writeq_wake(
        struct xlog_ticket      *tic;
        int                     need_bytes;
 
-       list_for_each_entry(tic, &log->l_writeq, t_queue) {
+       list_for_each_entry(tic, &log->l_write_head.waiters, t_queue) {
                ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
 
                need_bytes = tic->t_unit_res;
@@ -205,7 +205,7 @@ xlog_reserveq_wait(
        struct xlog_ticket      *tic,
        int                     need_bytes)
 {
-       list_add_tail(&tic->t_queue, &log->l_reserveq);
+       list_add_tail(&tic->t_queue, &log->l_reserve_head.waiters);
 
        do {
                if (XLOG_FORCED_SHUTDOWN(log))
@@ -213,7 +213,7 @@ xlog_reserveq_wait(
                xlog_grant_push_ail(log, need_bytes);
 
                __set_current_state(TASK_UNINTERRUPTIBLE);
-               spin_unlock(&log->l_grant_reserve_lock);
+               spin_unlock(&log->l_reserve_head.lock);
 
                XFS_STATS_INC(xs_sleep_logspace);
 
@@ -221,10 +221,10 @@ xlog_reserveq_wait(
                schedule();
                trace_xfs_log_grant_wake(log, tic);
 
-               spin_lock(&log->l_grant_reserve_lock);
+               spin_lock(&log->l_reserve_head.lock);
                if (XLOG_FORCED_SHUTDOWN(log))
                        goto shutdown;
-       } while (xlog_space_left(log, &log->l_grant_reserve_head) < need_bytes);
+       } while (xlog_space_left(log, &log->l_reserve_head.grant) < need_bytes);
 
        list_del_init(&tic->t_queue);
        return 0;
@@ -239,7 +239,7 @@ xlog_writeq_wait(
        struct xlog_ticket      *tic,
        int                     need_bytes)
 {
-       list_add_tail(&tic->t_queue, &log->l_writeq);
+       list_add_tail(&tic->t_queue, &log->l_write_head.waiters);
 
        do {
                if (XLOG_FORCED_SHUTDOWN(log))
@@ -247,7 +247,7 @@ xlog_writeq_wait(
                xlog_grant_push_ail(log, need_bytes);
 
                __set_current_state(TASK_UNINTERRUPTIBLE);
-               spin_unlock(&log->l_grant_write_lock);
+               spin_unlock(&log->l_write_head.lock);
 
                XFS_STATS_INC(xs_sleep_logspace);
 
@@ -255,10 +255,10 @@ xlog_writeq_wait(
                schedule();
                trace_xfs_log_regrant_write_wake(log, tic);
 
-               spin_lock(&log->l_grant_write_lock);
+               spin_lock(&log->l_write_head.lock);
                if (XLOG_FORCED_SHUTDOWN(log))
                        goto shutdown;
-       } while (xlog_space_left(log, &log->l_grant_write_head) < need_bytes);
+       } while (xlog_space_left(log, &log->l_write_head.grant) < need_bytes);
 
        list_del_init(&tic->t_queue);
        return 0;
@@ -779,22 +779,22 @@ xfs_log_space_wake(
        if (XLOG_FORCED_SHUTDOWN(log))
                return;
 
-       if (!list_empty_careful(&log->l_writeq)) {
+       if (!list_empty_careful(&log->l_write_head.waiters)) {
                ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
 
-               spin_lock(&log->l_grant_write_lock);
-               free_bytes = xlog_space_left(log, &log->l_grant_write_head);
+               spin_lock(&log->l_write_head.lock);
+               free_bytes = xlog_space_left(log, &log->l_write_head.grant);
                xlog_writeq_wake(log, &free_bytes);
-               spin_unlock(&log->l_grant_write_lock);
+               spin_unlock(&log->l_write_head.lock);
        }
 
-       if (!list_empty_careful(&log->l_reserveq)) {
+       if (!list_empty_careful(&log->l_reserve_head.waiters)) {
                ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
 
-               spin_lock(&log->l_grant_reserve_lock);
-               free_bytes = xlog_space_left(log, &log->l_grant_reserve_head);
+               spin_lock(&log->l_reserve_head.lock);
+               free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
                xlog_reserveq_wake(log, &free_bytes);
-               spin_unlock(&log->l_grant_reserve_lock);
+               spin_unlock(&log->l_reserve_head.lock);
        }
 }
 
@@ -1070,12 +1070,12 @@ xlog_alloc_log(xfs_mount_t      *mp,
        xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0);
        xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0);
        log->l_curr_cycle  = 1;     /* 0 is bad since this is initial value */
-       xlog_assign_grant_head(&log->l_grant_reserve_head, 1, 0);
-       xlog_assign_grant_head(&log->l_grant_write_head, 1, 0);
-       INIT_LIST_HEAD(&log->l_reserveq);
-       INIT_LIST_HEAD(&log->l_writeq);
-       spin_lock_init(&log->l_grant_reserve_lock);
-       spin_lock_init(&log->l_grant_write_lock);
+       xlog_assign_grant_head(&log->l_reserve_head.grant, 1, 0);
+       xlog_assign_grant_head(&log->l_write_head.grant, 1, 0);
+       INIT_LIST_HEAD(&log->l_reserve_head.waiters);
+       INIT_LIST_HEAD(&log->l_write_head.waiters);
+       spin_lock_init(&log->l_reserve_head.lock);
+       spin_lock_init(&log->l_write_head.lock);
 
        error = EFSCORRUPTED;
        if (xfs_sb_version_hassector(&mp->m_sb)) {
@@ -1250,7 +1250,7 @@ xlog_grant_push_ail(
 
        ASSERT(BTOBB(need_bytes) < log->l_logBBsize);
 
-       free_bytes = xlog_space_left(log, &log->l_grant_reserve_head);
+       free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
        free_blocks = BTOBBT(free_bytes);
 
        /*
@@ -1382,8 +1382,8 @@ xlog_sync(xlog_t          *log,
                 roundoff < BBTOB(1)));
 
        /* move grant heads by roundoff in sync */
-       xlog_grant_add_space(log, &log->l_grant_reserve_head, roundoff);
-       xlog_grant_add_space(log, &log->l_grant_write_head, roundoff);
+       xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff);
+       xlog_grant_add_space(log, &log->l_write_head.grant, roundoff);
 
        /* put cycle number in every block */
        xlog_pack_data(log, iclog, roundoff); 
@@ -2547,8 +2547,8 @@ restart:
  * path. Hence any lock will be globally hot if we take it unconditionally on
  * every pass.
  *
- * As tickets are only ever moved on and off the reserveq under the
- * l_grant_reserve_lock, we only need to take that lock if we are going to add
+ * As tickets are only ever moved on and off the l_reserve.waiters under the
+ * l_reserve.lock, we only need to take that lock if we are going to add
  * the ticket to the queue and sleep. We can avoid taking the lock if the ticket
  * was never added to the reserveq because the t_queue list head will be empty
  * and we hold the only reference to it so it can safely be checked unlocked.
@@ -2574,23 +2574,23 @@ xlog_grant_log_space(
        need_bytes = tic->t_unit_res;
        if (tic->t_flags & XFS_LOG_PERM_RESERV)
                need_bytes *= tic->t_ocnt;
-       free_bytes = xlog_space_left(log, &log->l_grant_reserve_head);
-       if (!list_empty_careful(&log->l_reserveq)) {
-               spin_lock(&log->l_grant_reserve_lock);
+       free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
+       if (!list_empty_careful(&log->l_reserve_head.waiters)) {
+               spin_lock(&log->l_reserve_head.lock);
                if (!xlog_reserveq_wake(log, &free_bytes) ||
                    free_bytes < need_bytes)
                        error = xlog_reserveq_wait(log, tic, need_bytes);
-               spin_unlock(&log->l_grant_reserve_lock);
+               spin_unlock(&log->l_reserve_head.lock);
        } else if (free_bytes < need_bytes) {
-               spin_lock(&log->l_grant_reserve_lock);
+               spin_lock(&log->l_reserve_head.lock);
                error = xlog_reserveq_wait(log, tic, need_bytes);
-               spin_unlock(&log->l_grant_reserve_lock);
+               spin_unlock(&log->l_reserve_head.lock);
        }
        if (error)
                return error;
 
-       xlog_grant_add_space(log, &log->l_grant_reserve_head, need_bytes);
-       xlog_grant_add_space(log, &log->l_grant_write_head, need_bytes);
+       xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes);
+       xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
        trace_xfs_log_grant_exit(log, tic);
        xlog_verify_grant_tail(log);
        return 0;
@@ -2627,23 +2627,23 @@ xlog_regrant_write_log_space(
         * otherwise try to get some space for this transaction.
         */
        need_bytes = tic->t_unit_res;
-       free_bytes = xlog_space_left(log, &log->l_grant_write_head);
-       if (!list_empty_careful(&log->l_writeq)) {
-               spin_lock(&log->l_grant_write_lock);
+       free_bytes = xlog_space_left(log, &log->l_write_head.grant);
+       if (!list_empty_careful(&log->l_write_head.waiters)) {
+               spin_lock(&log->l_write_head.lock);
                if (!xlog_writeq_wake(log, &free_bytes) ||
                    free_bytes < need_bytes)
                        error = xlog_writeq_wait(log, tic, need_bytes);
-               spin_unlock(&log->l_grant_write_lock);
+               spin_unlock(&log->l_write_head.lock);
        } else if (free_bytes < need_bytes) {
-               spin_lock(&log->l_grant_write_lock);
+               spin_lock(&log->l_write_head.lock);
                error = xlog_writeq_wait(log, tic, need_bytes);
-               spin_unlock(&log->l_grant_write_lock);
+               spin_unlock(&log->l_write_head.lock);
        }
 
        if (error)
                return error;
 
-       xlog_grant_add_space(log, &log->l_grant_write_head, need_bytes);
+       xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
        trace_xfs_log_regrant_write_exit(log, tic);
        xlog_verify_grant_tail(log);
        return 0;
@@ -2665,9 +2665,9 @@ xlog_regrant_reserve_log_space(xlog_t          *log,
        if (ticket->t_cnt > 0)
                ticket->t_cnt--;
 
-       xlog_grant_sub_space(log, &log->l_grant_reserve_head,
+       xlog_grant_sub_space(log, &log->l_reserve_head.grant,
                                        ticket->t_curr_res);
-       xlog_grant_sub_space(log, &log->l_grant_write_head,
+       xlog_grant_sub_space(log, &log->l_write_head.grant,
                                        ticket->t_curr_res);
        ticket->t_curr_res = ticket->t_unit_res;
        xlog_tic_reset_res(ticket);
@@ -2678,7 +2678,7 @@ xlog_regrant_reserve_log_space(xlog_t          *log,
        if (ticket->t_cnt > 0)
                return;
 
-       xlog_grant_add_space(log, &log->l_grant_reserve_head,
+       xlog_grant_add_space(log, &log->l_reserve_head.grant,
                                        ticket->t_unit_res);
 
        trace_xfs_log_regrant_reserve_exit(log, ticket);
@@ -2724,8 +2724,8 @@ xlog_ungrant_log_space(xlog_t          *log,
                bytes += ticket->t_unit_res*ticket->t_cnt;
        }
 
-       xlog_grant_sub_space(log, &log->l_grant_reserve_head, bytes);
-       xlog_grant_sub_space(log, &log->l_grant_write_head, bytes);
+       xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes);
+       xlog_grant_sub_space(log, &log->l_write_head.grant, bytes);
 
        trace_xfs_log_ungrant_exit(log, ticket);
 
@@ -3349,7 +3349,7 @@ xlog_verify_grant_tail(
        int             tail_cycle, tail_blocks;
        int             cycle, space;
 
-       xlog_crack_grant_head(&log->l_grant_write_head, &cycle, &space);
+       xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space);
        xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks);
        if (tail_cycle != cycle) {
                if (cycle - 1 != tail_cycle &&
@@ -3619,15 +3619,15 @@ xfs_log_force_umount(
         * we don't enqueue anything once the SHUTDOWN flag is set, and this
         * action is protected by the grant locks.
         */
-       spin_lock(&log->l_grant_reserve_lock);
-       list_for_each_entry(tic, &log->l_reserveq, t_queue)
+       spin_lock(&log->l_reserve_head.lock);
+       list_for_each_entry(tic, &log->l_reserve_head.waiters, t_queue)
                wake_up_process(tic->t_task);
-       spin_unlock(&log->l_grant_reserve_lock);
+       spin_unlock(&log->l_reserve_head.lock);
 
-       spin_lock(&log->l_grant_write_lock);
-       list_for_each_entry(tic, &log->l_writeq, t_queue)
+       spin_lock(&log->l_write_head.lock);
+       list_for_each_entry(tic, &log->l_write_head.waiters, t_queue)
                wake_up_process(tic->t_task);
-       spin_unlock(&log->l_grant_write_lock);
+       spin_unlock(&log->l_write_head.lock);
 
        if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) {
                ASSERT(!logerror);

diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index d8c5e47..eba4ec9 100644 (file)
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -470,6 +470,16 @@ struct xfs_cil {
 #define XLOG_CIL_HARD_SPACE_LIMIT(log) (3 * (log->l_logsize >> 4))
 
 /*
+ * ticket grant locks, queues and accounting have their own cachlines
+ * as these are quite hot and can be operated on concurrently.
+ */
+struct xlog_grant_head {
+       spinlock_t              lock ____cacheline_aligned_in_smp;
+       struct list_head        waiters;
+       atomic64_t              grant;
+};
+
+/*
  * The reservation head lsn is not made up of a cycle number and block number.
  * Instead, it uses a cycle number and byte number.  Logs don't expect to
  * overflow 31 bits worth of byte offset, so using a byte number will mean
@@ -520,17 +530,8 @@ typedef struct log {
        /* lsn of 1st LR with unflushed * buffers */
        atomic64_t              l_tail_lsn ____cacheline_aligned_in_smp;
 
-       /*
-        * ticket grant locks, queues and accounting have their own cachlines
-        * as these are quite hot and can be operated on concurrently.
-        */
-       spinlock_t              l_grant_reserve_lock ____cacheline_aligned_in_smp;
-       struct list_head        l_reserveq;
-       atomic64_t              l_grant_reserve_head;
-
-       spinlock_t              l_grant_write_lock ____cacheline_aligned_in_smp;
-       struct list_head        l_writeq;
-       atomic64_t              l_grant_write_head;
+       struct xlog_grant_head  l_reserve_head;
+       struct xlog_grant_head  l_write_head;
 
        /* The following field are used for debugging; need to hold icloglock */
 #ifdef DEBUG

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 8a3d8ae..7c75c73 100644 (file)
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -965,9 +965,9 @@ xlog_find_tail(
                log->l_curr_cycle++;
        atomic64_set(&log->l_tail_lsn, be64_to_cpu(rhead->h_tail_lsn));
        atomic64_set(&log->l_last_sync_lsn, be64_to_cpu(rhead->h_lsn));
-       xlog_assign_grant_head(&log->l_grant_reserve_head, log->l_curr_cycle,
+       xlog_assign_grant_head(&log->l_reserve_head.grant, log->l_curr_cycle,
                                        BBTOB(log->l_curr_block));
-       xlog_assign_grant_head(&log->l_grant_write_head, log->l_curr_cycle,
+       xlog_assign_grant_head(&log->l_write_head.grant, log->l_curr_cycle,
                                        BBTOB(log->l_curr_block));
 
        /*

diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index bb134a8..a80e308 100644 (file)
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -782,12 +782,12 @@ DECLARE_EVENT_CLASS(xfs_loggrant_class,
                __entry->curr_res = tic->t_curr_res;
                __entry->unit_res = tic->t_unit_res;
                __entry->flags = tic->t_flags;
-               __entry->reserveq = list_empty(&log->l_reserveq);
-               __entry->writeq = list_empty(&log->l_writeq);
-               xlog_crack_grant_head(&log->l_grant_reserve_head,
+               __entry->reserveq = list_empty(&log->l_reserve_head.waiters);
+               __entry->writeq = list_empty(&log->l_write_head.waiters);
+               xlog_crack_grant_head(&log->l_reserve_head.grant,
                                &__entry->grant_reserve_cycle,
                                &__entry->grant_reserve_bytes);
-               xlog_crack_grant_head(&log->l_grant_write_head,
+               xlog_crack_grant_head(&log->l_write_head.grant,
                                &__entry->grant_write_cycle,
                                &__entry->grant_write_bytes);
                __entry->curr_cycle = log->l_curr_cycle;