xfs: use wait queues directly for the log wait queues

The log grant queues are one of the few places left using sv_t
constructs for waiting. Given we are touching this code, we should
convert them to plain wait queues. While there, convert all the
other sv_t users in the log code as well.

Seeing as this removes the last users of the sv_t type, remove the
header file defining the wrapper and the fragments that still
reference it.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

6 files changed, 52 insertions, 106 deletions

diff --git a/fs/xfs/linux-2.6/sv.h b/fs/xfs/linux-2.6/sv.h
deleted file mode 100644
index 4dfc7c37081..00000000000
--- a/fs/xfs/linux-2.6/sv.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write the Free Software Foundation,
- * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- */
-#ifndef __XFS_SUPPORT_SV_H__
-#define __XFS_SUPPORT_SV_H__
-
-#include <linux/wait.h>
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-
-/*
- * Synchronisation variables.
- *
- * (Parameters "pri", "svf" and "rts" are not implemented)
- */
-
-typedef struct sv_s {
-        wait_queue_head_t waiters;
-} sv_t;
-
-static inline void _sv_wait(sv_t *sv, spinlock_t *lock)
-{
-        DECLARE_WAITQUEUE(wait, current);
-
-        add_wait_queue_exclusive(&sv->waiters, &wait);
-        __set_current_state(TASK_UNINTERRUPTIBLE);
-        spin_unlock(lock);
-
-        schedule();
-
-        remove_wait_queue(&sv->waiters, &wait);
-}
-
-#define sv_init(sv,flag,name) \
-        init_waitqueue_head(&(sv)->waiters)
-#define sv_destroy(sv) \
-        /*NOTHING*/
-#define sv_wait(sv, pri, lock, s) \
-        _sv_wait(sv, lock)
-#define sv_signal(sv) \
-        wake_up(&(sv)->waiters)
-#define sv_broadcast(sv) \
-        wake_up_all(&(sv)->waiters)
-
-#endif /* __XFS_SUPPORT_SV_H__ */
diff --git a/fs/xfs/linux-2.6/xfs_linux.h b/fs/xfs/linux-2.6/xfs_linux.h
index 214ddd71ff7..09649499774 100644
--- a/fs/xfs/linux-2.6/xfs_linux.h
+++ b/fs/xfs/linux-2.6/xfs_linux.h
@@ -37,7 +37,6 @@
 
 #include <kmem.h>
 #include <mrlock.h>
-#include <sv.h>
 #include <time.h>
 
 #include <support/debug.h>
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c
index faf8e1a83a1..d22aa310310 100644
--- a/fs/xfs/quota/xfs_dquot.c
+++ b/fs/xfs/quota/xfs_dquot.c
@@ -149,7 +149,6 @@ xfs_qm_dqdestroy(
         ASSERT(list_empty(&dqp->q_freelist));
 
         mutex_destroy(&dqp->q_qlock);
-        sv_destroy(&dqp->q_pinwait);
         kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
 
         atomic_dec(&xfs_Gqm->qm_totaldquots);
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 6bba8b4b859..cc0504e0bb3 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -547,8 +547,8 @@ xfs_log_unmount_write(xfs_mount_t *mp)
                 if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
                       iclog->ic_state == XLOG_STATE_DIRTY)) {
                         if (!XLOG_FORCED_SHUTDOWN(log)) {
-                                sv_wait(&iclog->ic_force_wait, PMEM,
-                                        &log->l_icloglock, s);
+                                xlog_wait(&iclog->ic_force_wait,
+                                                        &log->l_icloglock);
                         } else {
                                 spin_unlock(&log->l_icloglock);
                         }
@@ -588,8 +588,8 @@ xfs_log_unmount_write(xfs_mount_t *mp)
                         || iclog->ic_state == XLOG_STATE_DIRTY
                         || iclog->ic_state == XLOG_STATE_IOERROR) ) {
 
-                                sv_wait(&iclog->ic_force_wait, PMEM,
-                                        &log->l_icloglock, s);
+                                xlog_wait(&iclog->ic_force_wait,
+                                                        &log->l_icloglock);
                 } else {
                         spin_unlock(&log->l_icloglock);
                 }
@@ -700,7 +700,7 @@ xfs_log_move_tail(xfs_mount_t	*mp,
                                 break;
                         tail_lsn = 0;
                         free_bytes -= tic->t_unit_res;
-                        sv_signal(&tic->t_wait);
+                        wake_up(&tic->t_wait);
                 }
         }
 
@@ -719,7 +719,7 @@ xfs_log_move_tail(xfs_mount_t	*mp,
                                 break;
                         tail_lsn = 0;
                         free_bytes -= need_bytes;
-                        sv_signal(&tic->t_wait);
+                        wake_up(&tic->t_wait);
                 }
         }
         spin_unlock(&log->l_grant_lock);
@@ -1060,7 +1060,7 @@ xlog_alloc_log(xfs_mount_t	*mp,
 
         spin_lock_init(&log->l_icloglock);
         spin_lock_init(&log->l_grant_lock);
-        sv_init(&log->l_flush_wait, 0, "flush_wait");
+        init_waitqueue_head(&log->l_flush_wait);
 
         /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
         ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
@@ -1116,8 +1116,8 @@ xlog_alloc_log(xfs_mount_t	*mp,
 
                 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp));
                 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0);
-                sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force");
-                sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write");
+                init_waitqueue_head(&iclog->ic_force_wait);
+                init_waitqueue_head(&iclog->ic_write_wait);
 
                 iclogp = &iclog->ic_next;
         }
@@ -1132,11 +1132,8 @@ xlog_alloc_log(xfs_mount_t	*mp,
 out_free_iclog:
         for (iclog = log->l_iclog; iclog; iclog = prev_iclog) {
                 prev_iclog = iclog->ic_next;
-                if (iclog->ic_bp) {
-                        sv_destroy(&iclog->ic_force_wait);
-                        sv_destroy(&iclog->ic_write_wait);
+                if (iclog->ic_bp)
                         xfs_buf_free(iclog->ic_bp);
-                }
                 kmem_free(iclog);
         }
         spinlock_destroy(&log->l_icloglock);
@@ -1453,8 +1450,6 @@ xlog_dealloc_log(xlog_t *log)
 
         iclog = log->l_iclog;
         for (i=0; i<log->l_iclog_bufs; i++) {
-                sv_destroy(&iclog->ic_force_wait);
-                sv_destroy(&iclog->ic_write_wait);
                 xfs_buf_free(iclog->ic_bp);
                 next_iclog = iclog->ic_next;
                 kmem_free(iclog);
@@ -2261,7 +2256,7 @@ xlog_state_do_callback(
                         xlog_state_clean_log(log);
 
                         /* wake up threads waiting in xfs_log_force() */
-                        sv_broadcast(&iclog->ic_force_wait);
+                        wake_up_all(&iclog->ic_force_wait);
 
                         iclog = iclog->ic_next;
                 } while (first_iclog != iclog);
@@ -2308,7 +2303,7 @@ xlog_state_do_callback(
         spin_unlock(&log->l_icloglock);
 
         if (wake)
-                sv_broadcast(&log->l_flush_wait);
+                wake_up_all(&log->l_flush_wait);
 }
 
 
@@ -2359,7 +2354,7 @@ xlog_state_done_syncing(
          * iclog buffer, we wake them all, one will get to do the
          * I/O, the others get to wait for the result.
          */
-        sv_broadcast(&iclog->ic_write_wait);
+        wake_up_all(&iclog->ic_write_wait);
         spin_unlock(&log->l_icloglock);
         xlog_state_do_callback(log, aborted, iclog);    /* also cleans log */
 }       /* xlog_state_done_syncing */
@@ -2408,7 +2403,7 @@ restart:
                 XFS_STATS_INC(xs_log_noiclogs);
 
                 /* Wait for log writes to have flushed */
-                sv_wait(&log->l_flush_wait, 0, &log->l_icloglock, 0);
+                xlog_wait(&log->l_flush_wait, &log->l_icloglock);
                 goto restart;
         }
 
@@ -2523,7 +2518,8 @@ xlog_grant_log_space(xlog_t	   *log,
                         goto error_return;
 
                 XFS_STATS_INC(xs_sleep_logspace);
-                sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s);
+                xlog_wait(&tic->t_wait, &log->l_grant_lock);
+
                 /*
                  * If we got an error, and the filesystem is shutting down,
                  * we'll catch it down below. So just continue...
@@ -2552,7 +2548,7 @@ redo:
                 spin_lock(&log->l_grant_lock);
 
                 XFS_STATS_INC(xs_sleep_logspace);
-                sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s);
+                xlog_wait(&tic->t_wait, &log->l_grant_lock);
 
                 spin_lock(&log->l_grant_lock);
                 if (XLOG_FORCED_SHUTDOWN(log))
@@ -2635,7 +2631,7 @@ xlog_regrant_write_log_space(xlog_t	   *log,
                         if (free_bytes < ntic->t_unit_res)
                                 break;
                         free_bytes -= ntic->t_unit_res;
-                        sv_signal(&ntic->t_wait);
+                        wake_up(&ntic->t_wait);
                 }
 
                 if (ntic != list_first_entry(&log->l_writeq,
@@ -2650,8 +2646,7 @@ xlog_regrant_write_log_space(xlog_t	   *log,
                         spin_lock(&log->l_grant_lock);
 
                         XFS_STATS_INC(xs_sleep_logspace);
-                        sv_wait(&tic->t_wait, PINOD|PLTWAIT,
-                                &log->l_grant_lock, s);
+                        xlog_wait(&tic->t_wait, &log->l_grant_lock);
 
                         /* If we're shutting down, this tic is already
                          * off the queue */
@@ -2677,8 +2672,7 @@ redo:
 
                 XFS_STATS_INC(xs_sleep_logspace);
                 trace_xfs_log_regrant_write_sleep2(log, tic);
-
-                sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s);
+                xlog_wait(&tic->t_wait, &log->l_grant_lock);
 
                 /* If we're shutting down, this tic is already off the queue */
                 spin_lock(&log->l_grant_lock);
@@ -3029,7 +3023,7 @@ maybe_sleep:
                         return XFS_ERROR(EIO);
                 }
                 XFS_STATS_INC(xs_log_force_sleep);
-                sv_wait(&iclog->ic_force_wait, PINOD, &log->l_icloglock, s);
+                xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
                 /*
                  * No need to grab the log lock here since we're
                  * only deciding whether or not to return EIO
@@ -3147,8 +3141,8 @@ try_again:
 
                                 XFS_STATS_INC(xs_log_force_sleep);
 
-                                sv_wait(&iclog->ic_prev->ic_write_wait,
-                                        PSWP, &log->l_icloglock, s);
+                                xlog_wait(&iclog->ic_prev->ic_write_wait,
+                                                        &log->l_icloglock);
                                 if (log_flushed)
                                         *log_flushed = 1;
                                 already_slept = 1;
@@ -3176,7 +3170,7 @@ try_again:
                                 return XFS_ERROR(EIO);
                         }
                         XFS_STATS_INC(xs_log_force_sleep);
-                        sv_wait(&iclog->ic_force_wait, PSWP, &log->l_icloglock, s);
+                        xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
                         /*
                          * No need to grab the log lock here since we're
                          * only deciding whether or not to return EIO
@@ -3251,10 +3245,8 @@ xfs_log_ticket_put(
         xlog_ticket_t   *ticket)
 {
         ASSERT(atomic_read(&ticket->t_ref) > 0);
-        if (atomic_dec_and_test(&ticket->t_ref)) {
-                sv_destroy(&ticket->t_wait);
+        if (atomic_dec_and_test(&ticket->t_ref))
                 kmem_zone_free(xfs_log_ticket_zone, ticket);
-        }
 }
 
 xlog_ticket_t *
@@ -3387,7 +3379,7 @@ xlog_ticket_alloc(
         tic->t_trans_type       = 0;
         if (xflags & XFS_LOG_PERM_RESERV)
                 tic->t_flags |= XLOG_TIC_PERM_RESERV;
-        sv_init(&tic->t_wait, SV_DEFAULT, "logtick");
+        init_waitqueue_head(&tic->t_wait);
 
         xlog_tic_reset_res(tic);
 
@@ -3719,10 +3711,10 @@ xfs_log_force_umount(
          * action is protected by the GRANTLOCK.
          */
         list_for_each_entry(tic, &log->l_reserveq, t_queue)
-                sv_signal(&tic->t_wait);
+                wake_up(&tic->t_wait);
 
         list_for_each_entry(tic, &log->l_writeq, t_queue)
-                sv_signal(&tic->t_wait);
+                wake_up(&tic->t_wait);
         spin_unlock(&log->l_grant_lock);
 
         if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) {
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index f36f1a2f4dc..9dc8125d04e 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -61,7 +61,7 @@ xlog_cil_init(
         INIT_LIST_HEAD(&cil->xc_committing);
         spin_lock_init(&cil->xc_cil_lock);
         init_rwsem(&cil->xc_ctx_lock);
-        sv_init(&cil->xc_commit_wait, SV_DEFAULT, "cilwait");
+        init_waitqueue_head(&cil->xc_commit_wait);
 
         INIT_LIST_HEAD(&ctx->committing);
         INIT_LIST_HEAD(&ctx->busy_extents);
@@ -563,7 +563,7 @@ restart:
                          * It is still being pushed! Wait for the push to
                          * complete, then start again from the beginning.
                          */
-                        sv_wait(&cil->xc_commit_wait, 0, &cil->xc_cil_lock, 0);
+                        xlog_wait(&cil->xc_commit_wait, &cil->xc_cil_lock);
                         goto restart;
                 }
         }
@@ -587,7 +587,7 @@ restart:
          */
         spin_lock(&cil->xc_cil_lock);
         ctx->commit_lsn = commit_lsn;
-        sv_broadcast(&cil->xc_commit_wait);
+        wake_up_all(&cil->xc_commit_wait);
         spin_unlock(&cil->xc_cil_lock);
 
         /* release the hounds! */
@@ -752,7 +752,7 @@ restart:
                          * It is still being pushed! Wait for the push to
                          * complete, then start again from the beginning.
                          */
-                        sv_wait(&cil->xc_commit_wait, 0, &cil->xc_cil_lock, 0);
+                        xlog_wait(&cil->xc_commit_wait, &cil->xc_cil_lock);
                         goto restart;
                 }
                 if (ctx->sequence != sequence)
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 2f74c80a7a4..e2bb276eb2a 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -241,7 +241,7 @@ typedef struct xlog_res {
 } xlog_res_t;
 
 typedef struct xlog_ticket {
-        sv_t               t_wait;       /* ticket wait queue            : 20 */
+        wait_queue_head_t  t_wait;       /* ticket wait queue */
         struct list_head   t_queue;      /* reserve/write queue */
         xlog_tid_t         t_tid;        /* transaction identifier       : 4  */
         atomic_t           t_ref;        /* ticket reference count       : 4  */
@@ -349,8 +349,8 @@ typedef union xlog_in_core2 {
  * and move everything else out to subsequent cachelines.
  */
 typedef struct xlog_in_core {
-        sv_t                    ic_force_wait;
-        sv_t                    ic_write_wait;
+        wait_queue_head_t       ic_force_wait;
+        wait_queue_head_t       ic_write_wait;
         struct xlog_in_core     *ic_next;
         struct xlog_in_core     *ic_prev;
         struct xfs_buf          *ic_bp;
@@ -417,7 +417,7 @@ struct xfs_cil {
         struct xfs_cil_ctx      *xc_ctx;
         struct rw_semaphore     xc_ctx_lock;
         struct list_head        xc_committing;
-        sv_t                    xc_commit_wait;
+        wait_queue_head_t       xc_commit_wait;
         xfs_lsn_t               xc_current_sequence;
 };
 
@@ -499,7 +499,7 @@ typedef struct log {
         int                     l_logBBsize;    /* size of log in BB chunks */
 
         /* The following block of fields are changed while holding icloglock */
-        sv_t                    l_flush_wait ____cacheline_aligned_in_smp;
+        wait_queue_head_t       l_flush_wait ____cacheline_aligned_in_smp;
                                                 /* waiting for iclog flush */
         int                     l_covered_state;/* state of "covering disk
                                                  * log entries" */
@@ -602,6 +602,21 @@ xlog_cil_force(struct log *log)
  */
 #define XLOG_UNMOUNT_REC_TYPE   (-1U)
 
+/*
+ * Wrapper function for waiting on a wait queue serialised against wakeups
+ * by a spinlock. This matches the semantics of all the wait queues used in the
+ * log code.
+ */
+static inline void xlog_wait(wait_queue_head_t *wq, spinlock_t *lock)
+{
+        DECLARE_WAITQUEUE(wait, current);
+
+        add_wait_queue_exclusive(wq, &wait);
+        __set_current_state(TASK_UNINTERRUPTIBLE);
+        spin_unlock(lock);
+        schedule();
+        remove_wait_queue(wq, &wait);
+}
 #endif  /* __KERNEL__ */
 
 #endif  /* __XFS_LOG_PRIV_H__ */