*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2011 by Delphix. All rights reserved.
+ * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
*/
#include <sys/zfs_context.h>
*/
kmem_cache_t *zio_cache;
kmem_cache_t *zio_link_cache;
+kmem_cache_t *zio_vdev_cache;
kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
int zio_bulk_flags = 0;
static inline void __zio_execute(zio_t *zio);
+static int
+zio_cons(void *arg, void *unused, int kmflag)
+{
+ zio_t *zio = arg;
+
+ bzero(zio, sizeof (zio_t));
+
+ mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL);
+ cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL);
+
+ list_create(&zio->io_parent_list, sizeof (zio_link_t),
+ offsetof(zio_link_t, zl_parent_node));
+ list_create(&zio->io_child_list, sizeof (zio_link_t),
+ offsetof(zio_link_t, zl_child_node));
+
+ return (0);
+}
+
+static void
+zio_dest(void *arg, void *unused)
+{
+ zio_t *zio = arg;
+
+ mutex_destroy(&zio->io_lock);
+ cv_destroy(&zio->io_cv);
+ list_destroy(&zio->io_parent_list);
+ list_destroy(&zio->io_child_list);
+}
+
void
zio_init(void)
{
#ifdef _KERNEL
data_alloc_arena = zio_alloc_arena;
#endif
- zio_cache = kmem_cache_create("zio_cache",
- sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, KMC_KMEM);
+ zio_cache = kmem_cache_create("zio_cache", sizeof (zio_t), 0,
+ zio_cons, zio_dest, NULL, NULL, NULL, KMC_KMEM);
zio_link_cache = kmem_cache_create("zio_link_cache",
sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, KMC_KMEM);
+ zio_vdev_cache = kmem_cache_create("zio_vdev_cache", sizeof(vdev_io_t),
+ PAGESIZE, NULL, NULL, NULL, NULL, NULL, KMC_VMEM);
/*
* For small buffers, we want a cache for each multiple of
zio_data_buf_cache[c] = NULL;
}
+ kmem_cache_destroy(zio_vdev_cache);
kmem_cache_destroy(zio_link_cache);
kmem_cache_destroy(zio_cache);
ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE));
+ return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE | KM_NODEBUG));
}
/*
ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE));
+ return (kmem_cache_alloc(zio_data_buf_cache[c],
+ KM_PUSHPAGE | KM_NODEBUG));
}
void
}
/*
+ * Dedicated I/O buffers to ensure that memory fragmentation never prevents
+ * or significantly delays the issuing of a zio. These buffers are used
+ * to aggregate I/O and could be used for raidz stripes.
+ */
+void *
+zio_vdev_alloc(void)
+{
+ return (kmem_cache_alloc(zio_vdev_cache, KM_PUSHPAGE));
+}
+
+void
+zio_vdev_free(void *buf)
+{
+ kmem_cache_free(zio_vdev_cache, buf);
+
+}
+
+/*
* ==========================================================================
* Push and pop I/O transform buffers
* ==========================================================================
ASSERT(vd || stage == ZIO_STAGE_OPEN);
zio = kmem_cache_alloc(zio_cache, KM_PUSHPAGE);
- bzero(zio, sizeof (zio_t));
-
- mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL);
- cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL);
-
- list_create(&zio->io_parent_list, sizeof (zio_link_t),
- offsetof(zio_link_t, zl_parent_node));
- list_create(&zio->io_child_list, sizeof (zio_link_t),
- offsetof(zio_link_t, zl_child_node));
if (vd != NULL)
zio->io_child_type = ZIO_CHILD_VDEV;
zio->io_child_type = ZIO_CHILD_LOGICAL;
if (bp != NULL) {
+ zio->io_logical = NULL;
zio->io_bp = (blkptr_t *)bp;
zio->io_bp_copy = *bp;
zio->io_bp_orig = *bp;
zio->io_logical = zio;
if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp))
pipeline |= ZIO_GANG_STAGES;
+ } else {
+ zio->io_logical = NULL;
+ zio->io_bp = NULL;
+ bzero(&zio->io_bp_copy, sizeof (blkptr_t));
+ bzero(&zio->io_bp_orig, sizeof (blkptr_t));
}
zio->io_spa = spa;
zio->io_txg = txg;
+ zio->io_ready = NULL;
zio->io_done = done;
zio->io_private = private;
+ zio->io_prev_space_delta = 0;
zio->io_type = type;
zio->io_priority = priority;
zio->io_vd = vd;
+ zio->io_vsd = NULL;
+ zio->io_vsd_ops = NULL;
zio->io_offset = offset;
+ zio->io_deadline = 0;
zio->io_orig_data = zio->io_data = data;
zio->io_orig_size = zio->io_size = size;
zio->io_orig_flags = zio->io_flags = flags;
zio->io_orig_stage = zio->io_stage = stage;
zio->io_orig_pipeline = zio->io_pipeline = pipeline;
+ bzero(&zio->io_prop, sizeof (zio_prop_t));
+ zio->io_cmd = 0;
+ zio->io_reexecute = 0;
+ zio->io_bp_override = NULL;
+ zio->io_walk_link = NULL;
+ zio->io_transform_stack = NULL;
+ zio->io_delay = 0;
+ zio->io_error = 0;
+ zio->io_child_count = 0;
+ zio->io_parent_count = 0;
+ zio->io_stall = NULL;
+ zio->io_gang_leader = NULL;
+ zio->io_gang_tree = NULL;
+ zio->io_executor = NULL;
+ zio->io_waiter = NULL;
+ zio->io_cksum_report = NULL;
+ zio->io_ena = 0;
+ bzero(zio->io_child_error, sizeof (int) * ZIO_CHILD_TYPES);
+ bzero(zio->io_children,
+ sizeof (uint64_t) * ZIO_CHILD_TYPES * ZIO_WAIT_TYPES);
+ bzero(&zio->io_bookmark, sizeof (zbookmark_t));
zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY);
zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE);
zio_add_child(pio, zio);
}
+ taskq_init_ent(&zio->io_tqent);
+
return (zio);
}
static void
zio_destroy(zio_t *zio)
{
- list_destroy(&zio->io_parent_list);
- list_destroy(&zio->io_child_list);
- mutex_destroy(&zio->io_lock);
- cv_destroy(&zio->io_cv);
kmem_cache_free(zio_cache, zio);
}
{
spa_t *spa = zio->io_spa;
zio_type_t t = zio->io_type;
- int flags = TQ_NOSLEEP | (cutinline ? TQ_FRONT : 0);
+ int flags = (cutinline ? TQ_FRONT : 0);
/*
* If we're a config writer or a probe, the normal issue and
ASSERT3U(q, <, ZIO_TASKQ_TYPES);
- while (taskq_dispatch(spa->spa_zio_taskq[t][q],
- (task_func_t *)zio_execute, zio, flags) == 0); /* do nothing */
+ /*
+ * NB: We are assuming that the zio can only be dispatched
+ * to a single taskq at a time. It would be a grievous error
+ * to dispatch the zio to another taskq at the same time.
+ */
+ ASSERT(taskq_empty_ent(&zio->io_tqent));
+ taskq_dispatch_ent(spa->spa_zio_taskq[t][q],
+ (task_func_t *)zio_execute, zio, flags, &zio->io_tqent);
}
static boolean_t
int
zio_wait(zio_t *zio)
{
+ uint64_t timeout;
int error;
ASSERT(zio->io_stage == ZIO_STAGE_OPEN);
ASSERT(zio->io_executor == NULL);
zio->io_waiter = curthread;
+ timeout = ddi_get_lbolt() + (zio_delay_max / MILLISEC * hz);
__zio_execute(zio);
mutex_enter(&zio->io_lock);
- while (zio->io_executor != NULL)
- cv_wait(&zio->io_cv, &zio->io_lock);
+ while (zio->io_executor != NULL) {
+ /*
+ * Wake up periodically to prevent the kernel from complaining
+ * about a blocked task. However, check zio_delay_max to see
+ * if the I/O has exceeded the timeout and post an ereport.
+ */
+ cv_timedwait_interruptible(&zio->io_cv, &zio->io_lock,
+ ddi_get_lbolt() + hz);
+
+ if (timeout && (ddi_get_lbolt() > timeout)) {
+ zio->io_delay = zio_delay_max;
+ zfs_ereport_post(FM_EREPORT_ZFS_DELAY,
+ zio->io_spa, zio->io_vd, zio, 0, 0);
+ timeout = 0;
+ }
+ }
mutex_exit(&zio->io_lock);
error = zio->io_error;
*/
pio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
+ /*
+ * We didn't allocate this bp, so make sure it doesn't get unmarked.
+ */
+ pio->io_flags &= ~ZIO_FLAG_FASTWRITE;
+
zio_nowait(zio);
return (ZIO_PIPELINE_CONTINUE);
flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0;
flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ?
METASLAB_GANG_CHILD : 0;
+ flags |= (zio->io_flags & ZIO_FLAG_FASTWRITE) ? METASLAB_FASTWRITE : 0;
error = metaslab_alloc(spa, mc, zio->io_size, bp,
zio->io_prop.zp_copies, zio->io_txg, NULL, flags);
* Try to allocate an intent log block. Return 0 on success, errno on failure.
*/
int
-zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp,
- uint64_t size, boolean_t use_slog)
+zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, uint64_t size,
+ boolean_t use_slog)
{
int error = 1;
ASSERT(txg > spa_syncing_txg(spa));
- if (use_slog)
+ /*
+ * ZIL blocks are always contiguous (i.e. not gang blocks) so we
+ * set the METASLAB_GANG_AVOID flag so that they don't "fast gang"
+ * when allocating them.
+ */
+ if (use_slog) {
error = metaslab_alloc(spa, spa_log_class(spa), size,
- new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID);
+ new_bp, 1, txg, NULL,
+ METASLAB_FASTWRITE | METASLAB_GANG_AVOID);
+ }
- if (error)
+ if (error) {
error = metaslab_alloc(spa, spa_normal_class(spa), size,
- new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID);
+ new_bp, 1, txg, NULL,
+ METASLAB_FASTWRITE | METASLAB_GANG_AVOID);
+ }
if (error == 0) {
BP_SET_LSIZE(new_bp, size);
vdev_stat_update(zio, zio->io_size);
/*
- * If this I/O is attached to a particular vdev is slow, exeeding
- * 30 seconds to complete, post an error described the I/O delay.
- * We ignore these errors if the device is currently unavailable.
+ * When an I/O completes but was slow post an ereport.
*/
- if (zio->io_delay >= zio_delay_max) {
- if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd))
- zfs_ereport_post(FM_EREPORT_ZFS_DELAY, zio->io_spa,
- zio->io_vd, zio, 0, 0);
- }
+ if (zio->io_delay >= zio_delay_max)
+ zfs_ereport_post(FM_EREPORT_ZFS_DELAY, zio->io_spa,
+ zio->io_vd, zio, 0, 0);
if (zio->io_error) {
/*
* Reexecution is potentially a huge amount of work.
* Hand it off to the otherwise-unused claim taskq.
*/
- (void) taskq_dispatch(
+ ASSERT(taskq_empty_ent(&zio->io_tqent));
+ (void) taskq_dispatch_ent(
zio->io_spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE],
- (task_func_t *)zio_reexecute, zio, TQ_SLEEP);
+ (task_func_t *)zio_reexecute, zio, 0,
+ &zio->io_tqent);
}
return (ZIO_PIPELINE_STOP);
}
zfs_ereport_free_checksum(zcr);
}
+ if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp &&
+ !BP_IS_HOLE(zio->io_bp)) {
+ metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp);
+ }
+
/*
* It is the responsibility of the done callback to ensure that this
* particular zio is no longer discoverable for adoption, and as
git://git.camperquake.de / zfs.git / blobdiff