X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fxfs%2Fxfs_buf.c;h=1f24ee5f0d7a376b7ceea669ad5b29ffd952cce3;hb=4347b9d7ad4223474d315c3ab6bc1ce7cce7fa2d;hp=c57836dc778f9c9263770516ba0248dfe20c8aab;hpb=14c62e78dc1379185515be41903c4a667efc6d54;p=pandora-kernel.git diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index c57836dc778f..1f24ee5f0d7a 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -43,7 +43,6 @@ static kmem_zone_t *xfs_buf_zone; STATIC int xfsbufd(void *); -STATIC void xfs_buf_delwri_queue(xfs_buf_t *, int); static struct workqueue_struct *xfslogd_workqueue; struct workqueue_struct *xfsdatad_workqueue; @@ -66,10 +65,6 @@ struct workqueue_struct *xfsconvertd_workqueue; #define xb_to_km(flags) \ (((flags) & XBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP) -#define xfs_buf_allocate(flags) \ - kmem_zone_alloc(xfs_buf_zone, xb_to_km(flags)) -#define xfs_buf_deallocate(bp) \ - kmem_zone_free(xfs_buf_zone, (bp)); static inline int xfs_buf_is_vmapped( @@ -152,6 +147,7 @@ xfs_buf_stale( struct xfs_buf *bp) { bp->b_flags |= XBF_STALE; + xfs_buf_delwri_dequeue(bp); atomic_set(&(bp)->b_lru_ref, 0); if (!list_empty(&bp->b_lru)) { struct xfs_buftarg *btp = bp->b_target; @@ -167,14 +163,19 @@ xfs_buf_stale( ASSERT(atomic_read(&bp->b_hold) >= 1); } -STATIC void -_xfs_buf_initialize( - xfs_buf_t *bp, - xfs_buftarg_t *target, +struct xfs_buf * +xfs_buf_alloc( + struct xfs_buftarg *target, xfs_off_t range_base, size_t range_length, xfs_buf_flags_t flags) { + struct xfs_buf *bp; + + bp = kmem_zone_alloc(xfs_buf_zone, xb_to_km(flags)); + if (unlikely(!bp)) + return NULL; + /* * We don't want certain flags to appear in b_flags. */ @@ -203,8 +204,9 @@ _xfs_buf_initialize( init_waitqueue_head(&bp->b_waiters); XFS_STATS_INC(xb_create); - trace_xfs_buf_init(bp, _RET_IP_); + + return bp; } /* @@ -277,7 +279,7 @@ xfs_buf_free( } else if (bp->b_flags & _XBF_KMEM) kmem_free(bp->b_addr); _xfs_buf_free_pages(bp); - xfs_buf_deallocate(bp); + kmem_zone_free(xfs_buf_zone, bp); } /* @@ -416,10 +418,7 @@ _xfs_buf_map_pages( /* * Look up, and creates if absent, a lockable buffer for * a given range of an inode. The buffer is returned - * locked. If other overlapping buffers exist, they are - * released before the new buffer is created and locked, - * which may imply that this call will block until those buffers - * are unlocked. No I/O is implied by this call. + * locked. No I/O is implied by this call. */ xfs_buf_t * _xfs_buf_find( @@ -481,8 +480,6 @@ _xfs_buf_find( /* No match found */ if (new_bp) { - _xfs_buf_initialize(new_bp, btp, range_base, - range_length, flags); rb_link_node(&new_bp->b_rbnode, parent, rbp); rb_insert_color(&new_bp->b_rbnode, &pag->pag_buf_tree); /* the buffer keeps the perag reference until it is freed */ @@ -525,35 +522,51 @@ found: } /* - * Assembles a buffer covering the specified range. - * Storage in memory for all portions of the buffer will be allocated, - * although backing storage may not be. + * Assembles a buffer covering the specified range. The code is optimised for + * cache hits, as metadata intensive workloads will see 3 orders of magnitude + * more hits than misses. */ -xfs_buf_t * +struct xfs_buf * xfs_buf_get( xfs_buftarg_t *target,/* target for buffer */ xfs_off_t ioff, /* starting offset of range */ size_t isize, /* length of range */ xfs_buf_flags_t flags) { - xfs_buf_t *bp, *new_bp; + struct xfs_buf *bp; + struct xfs_buf *new_bp; int error = 0; - new_bp = xfs_buf_allocate(flags); + bp = _xfs_buf_find(target, ioff, isize, flags, NULL); + if (likely(bp)) + goto found; + + new_bp = xfs_buf_alloc(target, ioff << BBSHIFT, isize << BBSHIFT, + flags); if (unlikely(!new_bp)) return NULL; bp = _xfs_buf_find(target, ioff, isize, flags, new_bp); + if (!bp) { + kmem_zone_free(xfs_buf_zone, new_bp); + return NULL; + } + if (bp == new_bp) { error = xfs_buf_allocate_memory(bp, flags); if (error) goto no_buffer; - } else { - xfs_buf_deallocate(new_bp); - if (unlikely(bp == NULL)) - return NULL; - } + } else + kmem_zone_free(xfs_buf_zone, new_bp); + + /* + * Now we have a workable buffer, fill in the block number so + * that we can do IO on it. + */ + bp->b_bn = ioff; + bp->b_count_desired = bp->b_buffer_length; +found: if (!(bp->b_flags & XBF_MAPPED)) { error = _xfs_buf_map_pages(bp, flags); if (unlikely(error)) { @@ -564,18 +577,10 @@ xfs_buf_get( } XFS_STATS_INC(xb_get); - - /* - * Always fill in the block number now, the mapped cases can do - * their own overlay of this later. - */ - bp->b_bn = ioff; - bp->b_count_desired = bp->b_buffer_length; - trace_xfs_buf_get(bp, flags, _RET_IP_); return bp; - no_buffer: +no_buffer: if (flags & (XBF_LOCK | XBF_TRYLOCK)) xfs_buf_unlock(bp); xfs_buf_rele(bp); @@ -689,19 +694,6 @@ xfs_buf_read_uncached( return bp; } -xfs_buf_t * -xfs_buf_get_empty( - size_t len, - xfs_buftarg_t *target) -{ - xfs_buf_t *bp; - - bp = xfs_buf_allocate(0); - if (bp) - _xfs_buf_initialize(bp, target, 0, len, 0); - return bp; -} - /* * Return a buffer allocated as an empty buffer and associated to external * memory via xfs_buf_associate_memory() back to it's empty state. @@ -787,10 +779,9 @@ xfs_buf_get_uncached( int error, i; xfs_buf_t *bp; - bp = xfs_buf_allocate(0); + bp = xfs_buf_alloc(target, 0, len, 0); if (unlikely(bp == NULL)) goto fail; - _xfs_buf_initialize(bp, target, 0, len, 0); error = _xfs_buf_get_pages(bp, page_count, 0); if (error) @@ -818,7 +809,7 @@ xfs_buf_get_uncached( __free_page(bp->b_pages[i]); _xfs_buf_free_pages(bp); fail_free_buf: - xfs_buf_deallocate(bp); + kmem_zone_free(xfs_buf_zone, bp); fail: return NULL; } @@ -937,12 +928,6 @@ void xfs_buf_unlock( struct xfs_buf *bp) { - if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI) { - atomic_inc(&bp->b_hold); - bp->b_flags |= XBF_ASYNC; - xfs_buf_delwri_queue(bp, 0); - } - XB_CLEAR_OWNER(bp); up(&bp->b_sema); @@ -1021,7 +1006,6 @@ xfs_buf_ioerror( int xfs_bwrite( - struct xfs_mount *mp, struct xfs_buf *bp) { int error; @@ -1033,25 +1017,13 @@ xfs_bwrite( xfs_bdstrat_cb(bp); error = xfs_buf_iowait(bp); - if (error) - xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); - xfs_buf_relse(bp); + if (error) { + xfs_force_shutdown(bp->b_target->bt_mount, + SHUTDOWN_META_IO_ERROR); + } return error; } -void -xfs_bdwrite( - void *mp, - struct xfs_buf *bp) -{ - trace_xfs_buf_bdwrite(bp, _RET_IP_); - - bp->b_flags &= ~XBF_READ; - bp->b_flags |= (XBF_DELWRI | XBF_ASYNC); - - xfs_buf_delwri_queue(bp, 1); -} - /* * Called when we want to stop a buffer from getting written or read. * We attach the EIO error, muck with its flags, and call xfs_buf_ioend @@ -1074,9 +1046,8 @@ xfs_bioerror( * We're calling xfs_buf_ioend, so delete XBF_DONE flag. */ XFS_BUF_UNREAD(bp); - XFS_BUF_UNDELAYWRITE(bp); XFS_BUF_UNDONE(bp); - XFS_BUF_STALE(bp); + xfs_buf_stale(bp); xfs_buf_ioend(bp, 0); @@ -1103,9 +1074,8 @@ xfs_bioerror_relse( * change that interface. */ XFS_BUF_UNREAD(bp); - XFS_BUF_UNDELAYWRITE(bp); XFS_BUF_DONE(bp); - XFS_BUF_STALE(bp); + xfs_buf_stale(bp); bp->b_iodone = NULL; if (!(fl & XBF_ASYNC)) { /* @@ -1115,7 +1085,7 @@ xfs_bioerror_relse( * ASYNC buffers. */ xfs_buf_ioerror(bp, EIO); - XFS_BUF_FINISH_IOWAIT(bp); + complete(&bp->b_iowait); } else { xfs_buf_relse(bp); } @@ -1275,15 +1245,10 @@ xfs_buf_iorequest( { trace_xfs_buf_iorequest(bp, _RET_IP_); - if (bp->b_flags & XBF_DELWRI) { - xfs_buf_delwri_queue(bp, 1); - return 0; - } + ASSERT(!(bp->b_flags & XBF_DELWRI)); - if (bp->b_flags & XBF_WRITE) { + if (bp->b_flags & XBF_WRITE) xfs_buf_wait_unpin(bp); - } - xfs_buf_hold(bp); /* Set the count to 1 initially, this will stop an I/O @@ -1514,12 +1479,12 @@ xfs_setsize_buftarg( } STATIC int -xfs_alloc_delwrite_queue( +xfs_alloc_delwri_queue( xfs_buftarg_t *btp, const char *fsname) { - INIT_LIST_HEAD(&btp->bt_delwrite_queue); - spin_lock_init(&btp->bt_delwrite_lock); + INIT_LIST_HEAD(&btp->bt_delwri_queue); + spin_lock_init(&btp->bt_delwri_lock); btp->bt_flags = 0; btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd/%s", fsname); if (IS_ERR(btp->bt_task)) @@ -1549,7 +1514,7 @@ xfs_alloc_buftarg( spin_lock_init(&btp->bt_lru_lock); if (xfs_setsize_buftarg_early(btp, bdev)) goto error; - if (xfs_alloc_delwrite_queue(btp, fsname)) + if (xfs_alloc_delwri_queue(btp, fsname)) goto error; btp->bt_shrinker.shrink = xfs_buftarg_shrink; btp->bt_shrinker.seeks = DEFAULT_SEEKS; @@ -1565,56 +1530,48 @@ error: /* * Delayed write buffer handling */ -STATIC void +void xfs_buf_delwri_queue( - xfs_buf_t *bp, - int unlock) + xfs_buf_t *bp) { - struct list_head *dwq = &bp->b_target->bt_delwrite_queue; - spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; + struct xfs_buftarg *btp = bp->b_target; trace_xfs_buf_delwri_queue(bp, _RET_IP_); - ASSERT((bp->b_flags&(XBF_DELWRI|XBF_ASYNC)) == (XBF_DELWRI|XBF_ASYNC)); + ASSERT(!(bp->b_flags & XBF_READ)); - spin_lock(dwlk); - /* If already in the queue, dequeue and place at tail */ + spin_lock(&btp->bt_delwri_lock); if (!list_empty(&bp->b_list)) { + /* if already in the queue, move it to the tail */ ASSERT(bp->b_flags & _XBF_DELWRI_Q); - if (unlock) - atomic_dec(&bp->b_hold); - list_del(&bp->b_list); - } - - if (list_empty(dwq)) { + list_move_tail(&bp->b_list, &btp->bt_delwri_queue); + } else { /* start xfsbufd as it is about to have something to do */ - wake_up_process(bp->b_target->bt_task); - } + if (list_empty(&btp->bt_delwri_queue)) + wake_up_process(bp->b_target->bt_task); - bp->b_flags |= _XBF_DELWRI_Q; - list_add_tail(&bp->b_list, dwq); + atomic_inc(&bp->b_hold); + bp->b_flags |= XBF_DELWRI | _XBF_DELWRI_Q | XBF_ASYNC; + list_add_tail(&bp->b_list, &btp->bt_delwri_queue); + } bp->b_queuetime = jiffies; - spin_unlock(dwlk); - - if (unlock) - xfs_buf_unlock(bp); + spin_unlock(&btp->bt_delwri_lock); } void xfs_buf_delwri_dequeue( xfs_buf_t *bp) { - spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; int dequeued = 0; - spin_lock(dwlk); + spin_lock(&bp->b_target->bt_delwri_lock); if ((bp->b_flags & XBF_DELWRI) && !list_empty(&bp->b_list)) { ASSERT(bp->b_flags & _XBF_DELWRI_Q); list_del_init(&bp->b_list); dequeued = 1; } bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q); - spin_unlock(dwlk); + spin_unlock(&bp->b_target->bt_delwri_lock); if (dequeued) xfs_buf_rele(bp); @@ -1646,9 +1603,9 @@ xfs_buf_delwri_promote( if (bp->b_queuetime < jiffies - age) return; bp->b_queuetime = jiffies - age; - spin_lock(&btp->bt_delwrite_lock); - list_move(&bp->b_list, &btp->bt_delwrite_queue); - spin_unlock(&btp->bt_delwrite_lock); + spin_lock(&btp->bt_delwri_lock); + list_move(&bp->b_list, &btp->bt_delwri_queue); + spin_unlock(&btp->bt_delwri_lock); } STATIC void @@ -1669,15 +1626,13 @@ xfs_buf_delwri_split( unsigned long age) { xfs_buf_t *bp, *n; - struct list_head *dwq = &target->bt_delwrite_queue; - spinlock_t *dwlk = &target->bt_delwrite_lock; int skipped = 0; int force; force = test_and_clear_bit(XBT_FORCE_FLUSH, &target->bt_flags); INIT_LIST_HEAD(list); - spin_lock(dwlk); - list_for_each_entry_safe(bp, n, dwq, b_list) { + spin_lock(&target->bt_delwri_lock); + list_for_each_entry_safe(bp, n, &target->bt_delwri_queue, b_list) { ASSERT(bp->b_flags & XBF_DELWRI); if (!xfs_buf_ispinned(bp) && xfs_buf_trylock(bp)) { @@ -1694,10 +1649,9 @@ xfs_buf_delwri_split( } else skipped++; } - spin_unlock(dwlk); + spin_unlock(&target->bt_delwri_lock); return skipped; - } /* @@ -1747,7 +1701,7 @@ xfsbufd( } /* sleep for a long time if there is nothing to do. */ - if (list_empty(&target->bt_delwrite_queue)) + if (list_empty(&target->bt_delwri_queue)) tout = MAX_SCHEDULE_TIMEOUT; schedule_timeout_interruptible(tout); @@ -1866,11 +1820,3 @@ xfs_buf_terminate(void) destroy_workqueue(xfslogd_workqueue); kmem_zone_destroy(xfs_buf_zone); } - -#ifdef CONFIG_KDB_MODULES -struct list_head * -xfs_get_buftarg_list(void) -{ - return &xfs_buftarg_list; -} -#endif