*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
* Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
*/
+#include <sys/sysmacros.h>
#include <sys/zfs_context.h>
#include <sys/fm/fs/zfs.h>
#include <sys/spa.h>
#include <sys/dmu_objset.h>
#include <sys/arc.h>
#include <sys/ddt.h>
+#include <sys/blkptr.h>
+#include <sys/zfeature.h>
+#include <sys/time.h>
+#include <sys/trace_zio.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;
int zio_delay_max = ZIO_DELAY_MAX;
-extern int zfs_mg_alloc_failures;
+#define ZIO_PIPELINE_CONTINUE 0x100
+#define ZIO_PIPELINE_STOP 0x101
+#define BP_SPANB(indblkshift, level) \
+ (((uint64_t)1) << ((level) * ((indblkshift) - SPA_BLKPTRSHIFT)))
+#define COMPARE_META_LEVEL 0x80000000ul
/*
* The following actions directly effect the spa's sync-to-convergence logic.
* The values below define the sync pass when we start performing the action.
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)
{
size_t c;
vmem_t *data_alloc_arena = NULL;
- zio_cache = kmem_cache_create("zio_cache", sizeof (zio_t), 0,
- zio_cons, zio_dest, NULL, NULL, NULL, KMC_KMEM);
+ zio_cache = kmem_cache_create("zio_cache",
+ sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
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);
+ sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
/*
* For small buffers, we want a cache for each multiple of
- * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache
- * for each quarter-power of 2. For large buffers, we want
- * a cache for each multiple of PAGESIZE.
+ * SPA_MINBLOCKSIZE. For larger buffers, we want a cache
+ * for each quarter-power of 2.
*/
for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) {
size_t size = (c + 1) << SPA_MINBLOCKSHIFT;
size_t p2 = size;
size_t align = 0;
+ size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0;
- while (p2 & (p2 - 1))
+#ifdef _ILP32
+ /*
+ * Cache size limited to 1M on 32-bit platforms until ARC
+ * buffers no longer require virtual address space.
+ */
+ if (size > zfs_max_recordsize)
+ break;
+#endif
+
+ while (!ISP2(p2))
p2 &= p2 - 1;
#ifndef _KERNEL
#endif
if (size <= 4 * SPA_MINBLOCKSIZE) {
align = SPA_MINBLOCKSIZE;
- } else if (IS_P2ALIGNED(size, PAGESIZE)) {
- align = PAGESIZE;
} else if (IS_P2ALIGNED(size, p2 >> 2)) {
- align = p2 >> 2;
+ align = MIN(p2 >> 2, PAGESIZE);
}
if (align != 0) {
char name[36];
- int flags = zio_bulk_flags;
-
- /*
- * The smallest buffers (512b) are heavily used and
- * experience a lot of churn. The slabs allocated
- * for them are also relatively small (32K). Thus
- * in over to avoid expensive calls to vmalloc() we
- * make an exception to the usual slab allocation
- * policy and force these buffers to be kmem backed.
- */
- if (size == (1 << SPA_MINBLOCKSHIFT))
- flags |= KMC_KMEM;
-
(void) sprintf(name, "zio_buf_%lu", (ulong_t)size);
zio_buf_cache[c] = kmem_cache_create(name, size,
- align, NULL, NULL, NULL, NULL, NULL, flags);
+ align, NULL, NULL, NULL, NULL, NULL, cflags);
(void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size);
zio_data_buf_cache[c] = kmem_cache_create(name, size,
align, NULL, NULL, NULL, NULL,
- data_alloc_arena, flags);
+ data_alloc_arena, cflags);
}
}
zio_data_buf_cache[c - 1] = zio_data_buf_cache[c];
}
- /*
- * The zio write taskqs have 1 thread per cpu, allow 1/2 of the taskqs
- * to fail 3 times per txg or 8 failures, whichever is greater.
- */
- if (zfs_mg_alloc_failures == 0)
- zfs_mg_alloc_failures = MAX((3 * max_ncpus / 2), 8);
-
zio_inject_init();
lz4_init();
kmem_cache_t *last_data_cache = NULL;
for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) {
+#ifdef _ILP32
+ /*
+ * Cache size limited to 1M on 32-bit platforms until ARC
+ * buffers no longer require virtual address space.
+ */
+ if (((c + 1) << SPA_MINBLOCKSHIFT) > zfs_max_recordsize)
+ break;
+#endif
if (zio_buf_cache[c] != last_cache) {
last_cache = zio_buf_cache[c];
kmem_cache_destroy(zio_buf_cache[c]);
zio_data_buf_cache[c] = NULL;
}
- kmem_cache_destroy(zio_vdev_cache);
kmem_cache_destroy(zio_link_cache);
kmem_cache_destroy(zio_cache);
{
size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
- ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
+ VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE | KM_NODEBUG));
+ return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE));
}
/*
{
size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
- ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
+ VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- return (kmem_cache_alloc(zio_data_buf_cache[c],
- KM_PUSHPAGE | KM_NODEBUG));
+ return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE));
}
-void
-zio_buf_free(void *buf, size_t size)
+/*
+ * Use zio_buf_alloc_flags when specific allocation flags are needed. e.g.
+ * passing KM_NOSLEEP when it is acceptable for an allocation to fail.
+ */
+void *
+zio_buf_alloc_flags(size_t size, int flags)
{
size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
- ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
+ VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- kmem_cache_free(zio_buf_cache[c], buf);
+ return (kmem_cache_alloc(zio_buf_cache[c], flags));
}
void
-zio_data_buf_free(void *buf, size_t size)
+zio_buf_free(void *buf, size_t size)
{
size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
- ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
+ VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- kmem_cache_free(zio_data_buf_cache[c], buf);
-}
-
-/*
- * 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));
+ kmem_cache_free(zio_buf_cache[c], buf);
}
void
-zio_vdev_free(void *buf)
+zio_data_buf_free(void *buf, size_t size)
{
- kmem_cache_free(zio_vdev_cache, buf);
+ size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
+
+ VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
+ kmem_cache_free(zio_data_buf_cache[c], buf);
}
/*
zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize,
zio_transform_func_t *transform)
{
- zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_PUSHPAGE);
+ zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP);
zt->zt_orig_data = zio->io_data;
zt->zt_orig_size = zio->io_size;
void
zio_add_child(zio_t *pio, zio_t *cio)
{
- zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_PUSHPAGE);
+ zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP);
int w;
/*
zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp,
void *data, uint64_t size, zio_done_func_t *done, void *private,
zio_type_t type, zio_priority_t priority, enum zio_flag flags,
- vdev_t *vd, uint64_t offset, const zbookmark_t *zb,
+ vdev_t *vd, uint64_t offset, const zbookmark_phys_t *zb,
enum zio_stage stage, enum zio_stage pipeline)
{
zio_t *zio;
ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER));
ASSERT(vd || stage == ZIO_STAGE_OPEN);
- zio = kmem_cache_alloc(zio_cache, KM_PUSHPAGE);
+ zio = kmem_cache_alloc(zio_cache, KM_SLEEP);
+ bzero(zio, sizeof (zio_t));
+
+ mutex_init(&zio->io_lock, NULL, MUTEX_NOLOCKDEP, 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_physdone = 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_timestamp = 0;
- zio->io_delta = 0;
- zio->io_delay = 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_error = 0;
- zio->io_child_count = 0;
- zio->io_phys_children = 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);
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);
}
return (zio_null(NULL, spa, NULL, done, private, flags));
}
+void
+zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp)
+{
+ int i;
+
+ if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp))) {
+ zfs_panic_recover("blkptr at %p has invalid TYPE %llu",
+ bp, (longlong_t)BP_GET_TYPE(bp));
+ }
+ if (BP_GET_CHECKSUM(bp) >= ZIO_CHECKSUM_FUNCTIONS ||
+ BP_GET_CHECKSUM(bp) <= ZIO_CHECKSUM_ON) {
+ zfs_panic_recover("blkptr at %p has invalid CHECKSUM %llu",
+ bp, (longlong_t)BP_GET_CHECKSUM(bp));
+ }
+ if (BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_FUNCTIONS ||
+ BP_GET_COMPRESS(bp) <= ZIO_COMPRESS_ON) {
+ zfs_panic_recover("blkptr at %p has invalid COMPRESS %llu",
+ bp, (longlong_t)BP_GET_COMPRESS(bp));
+ }
+ if (BP_GET_LSIZE(bp) > SPA_MAXBLOCKSIZE) {
+ zfs_panic_recover("blkptr at %p has invalid LSIZE %llu",
+ bp, (longlong_t)BP_GET_LSIZE(bp));
+ }
+ if (BP_GET_PSIZE(bp) > SPA_MAXBLOCKSIZE) {
+ zfs_panic_recover("blkptr at %p has invalid PSIZE %llu",
+ bp, (longlong_t)BP_GET_PSIZE(bp));
+ }
+
+ if (BP_IS_EMBEDDED(bp)) {
+ if (BPE_GET_ETYPE(bp) > NUM_BP_EMBEDDED_TYPES) {
+ zfs_panic_recover("blkptr at %p has invalid ETYPE %llu",
+ bp, (longlong_t)BPE_GET_ETYPE(bp));
+ }
+ }
+
+ /*
+ * Pool-specific checks.
+ *
+ * Note: it would be nice to verify that the blk_birth and
+ * BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze()
+ * allows the birth time of log blocks (and dmu_sync()-ed blocks
+ * that are in the log) to be arbitrarily large.
+ */
+ for (i = 0; i < BP_GET_NDVAS(bp); i++) {
+ uint64_t vdevid = DVA_GET_VDEV(&bp->blk_dva[i]);
+ vdev_t *vd;
+ uint64_t offset, asize;
+ if (vdevid >= spa->spa_root_vdev->vdev_children) {
+ zfs_panic_recover("blkptr at %p DVA %u has invalid "
+ "VDEV %llu",
+ bp, i, (longlong_t)vdevid);
+ continue;
+ }
+ vd = spa->spa_root_vdev->vdev_child[vdevid];
+ if (vd == NULL) {
+ zfs_panic_recover("blkptr at %p DVA %u has invalid "
+ "VDEV %llu",
+ bp, i, (longlong_t)vdevid);
+ continue;
+ }
+ if (vd->vdev_ops == &vdev_hole_ops) {
+ zfs_panic_recover("blkptr at %p DVA %u has hole "
+ "VDEV %llu",
+ bp, i, (longlong_t)vdevid);
+ continue;
+ }
+ if (vd->vdev_ops == &vdev_missing_ops) {
+ /*
+ * "missing" vdevs are valid during import, but we
+ * don't have their detailed info (e.g. asize), so
+ * we can't perform any more checks on them.
+ */
+ continue;
+ }
+ offset = DVA_GET_OFFSET(&bp->blk_dva[i]);
+ asize = DVA_GET_ASIZE(&bp->blk_dva[i]);
+ if (BP_IS_GANG(bp))
+ asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
+ if (offset + asize > vd->vdev_asize) {
+ zfs_panic_recover("blkptr at %p DVA %u has invalid "
+ "OFFSET %llu",
+ bp, i, (longlong_t)offset);
+ }
+ }
+}
+
zio_t *
zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
void *data, uint64_t size, zio_done_func_t *done, void *private,
- zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb)
+ zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb)
{
zio_t *zio;
+ zfs_blkptr_verify(spa, bp);
+
zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp,
data, size, done, private,
ZIO_TYPE_READ, priority, flags, NULL, 0, zb,
void *data, uint64_t size, const zio_prop_t *zp,
zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
void *private,
- zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb)
+ zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb)
{
zio_t *zio;
zio->io_physdone = physdone;
zio->io_prop = *zp;
+ /*
+ * Data can be NULL if we are going to call zio_write_override() to
+ * provide the already-allocated BP. But we may need the data to
+ * verify a dedup hit (if requested). In this case, don't try to
+ * dedup (just take the already-allocated BP verbatim).
+ */
+ if (data == NULL && zio->io_prop.zp_dedup_verify) {
+ zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE;
+ }
+
return (zio);
}
zio_t *
zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data,
uint64_t size, zio_done_func_t *done, void *private,
- zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb)
+ zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb)
{
zio_t *zio;
void
zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp)
{
+
+ /*
+ * The check for EMBEDDED is a performance optimization. We
+ * process the free here (by ignoring it) rather than
+ * putting it on the list and then processing it in zio_free_sync().
+ */
+ if (BP_IS_EMBEDDED(bp))
+ return;
metaslab_check_free(spa, bp);
/*
zio_t *zio;
enum zio_stage stage = ZIO_FREE_PIPELINE;
- dprintf_bp(bp, "freeing in txg %llu, pass %u",
- (longlong_t)txg, spa->spa_sync_pass);
-
ASSERT(!BP_IS_HOLE(bp));
ASSERT(spa_syncing_txg(spa) == txg);
ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free);
+ if (BP_IS_EMBEDDED(bp))
+ return (zio_null(pio, spa, NULL, NULL, NULL, 0));
+
metaslab_check_free(spa, bp);
arc_freed(spa, bp);
{
zio_t *zio;
+ dprintf_bp(bp, "claiming in txg %llu", txg);
+
+ if (BP_IS_EMBEDDED(bp))
+ return (zio_null(pio, spa, NULL, NULL, NULL, 0));
+
/*
* A claim is an allocation of a specific block. Claims are needed
* to support immediate writes in the intent log. The issue is that
ASSERT3U(offset + size, <=, vd->vdev_psize);
zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private,
- ZIO_TYPE_READ, priority, flags, vd, offset, NULL,
- ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE);
+ ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, vd, offset,
+ NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE);
zio->io_prop.zp_checksum = checksum;
ASSERT3U(offset + size, <=, vd->vdev_psize);
zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private,
- ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL,
- ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE);
+ ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, vd, offset,
+ NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE);
zio->io_prop.zp_checksum = checksum;
if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF &&
zio->io_child_type == ZIO_CHILD_LOGICAL &&
!(zio->io_flags & ZIO_FLAG_RAW)) {
- uint64_t psize = BP_GET_PSIZE(bp);
+ uint64_t psize =
+ BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp);
void *cbuf = zio_buf_alloc(psize);
zio_push_transform(zio, cbuf, psize, psize, zio_decompress);
}
+ if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) {
+ zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
+ decode_embedded_bp_compressed(bp, zio->io_data);
+ } else {
+ ASSERT(!BP_IS_EMBEDDED(bp));
+ }
+
if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0)
zio->io_flags |= ZIO_FLAG_DONT_CACHE;
*bp = *zio->io_bp_override;
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
+ if (BP_IS_EMBEDDED(bp))
+ return (ZIO_PIPELINE_CONTINUE);
+
/*
* If we've been overridden and nopwrite is set then
* set the flag accordingly to indicate that a nopwrite
BP_ZERO(bp);
}
- if (bp->blk_birth == zio->io_txg) {
+ if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) {
/*
* We're rewriting an existing block, which means we're
* working on behalf of spa_sync(). For spa_sync() to
compress = ZIO_COMPRESS_OFF;
/* Make sure someone doesn't change their mind on overwrites */
- ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp),
+ ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp),
spa_max_replication(spa)) == BP_GET_NDVAS(bp));
}
if (psize == 0 || psize == lsize) {
compress = ZIO_COMPRESS_OFF;
zio_buf_free(cbuf, lsize);
+ } else if (!zp->zp_dedup && psize <= BPE_PAYLOAD_SIZE &&
+ zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) &&
+ spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) {
+ encode_embedded_bp_compressed(bp,
+ cbuf, compress, lsize, psize);
+ BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA);
+ BP_SET_TYPE(bp, zio->io_prop.zp_type);
+ BP_SET_LEVEL(bp, zio->io_prop.zp_level);
+ zio_buf_free(cbuf, lsize);
+ bp->blk_birth = zio->io_txg;
+ zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
+ ASSERT(spa_feature_is_active(spa,
+ SPA_FEATURE_EMBEDDED_DATA));
+ return (ZIO_PIPELINE_CONTINUE);
} else {
- ASSERT(psize < lsize);
- zio_push_transform(zio, cbuf, psize, lsize, NULL);
+ /*
+ * Round up compressed size up to the ashift
+ * of the smallest-ashift device, and zero the tail.
+ * This ensures that the compressed size of the BP
+ * (and thus compressratio property) are correct,
+ * in that we charge for the padding used to fill out
+ * the last sector.
+ */
+ size_t rounded;
+
+ ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT);
+
+ rounded = (size_t)P2ROUNDUP(psize,
+ 1ULL << spa->spa_min_ashift);
+ if (rounded >= lsize) {
+ compress = ZIO_COMPRESS_OFF;
+ zio_buf_free(cbuf, lsize);
+ psize = lsize;
+ } else {
+ bzero((char *)cbuf + psize, rounded - psize);
+ psize = rounded;
+ zio_push_transform(zio, cbuf,
+ psize, lsize, NULL);
+ }
}
}
* spa_sync() to allocate new blocks, but force rewrites after that.
* There should only be a handful of blocks after pass 1 in any case.
*/
- if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize &&
+ if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg &&
+ BP_GET_PSIZE(bp) == psize &&
pass >= zfs_sync_pass_rewrite) {
enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES;
ASSERT(psize != 0);
}
if (psize == 0) {
+ if (zio->io_bp_orig.blk_birth != 0 &&
+ spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
+ BP_SET_LSIZE(bp, lsize);
+ BP_SET_TYPE(bp, zp->zp_type);
+ BP_SET_LEVEL(bp, zp->zp_level);
+ BP_SET_BIRTH(bp, zio->io_txg, 0);
+ }
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
} else {
ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER);
BP_SET_LSIZE(bp, lsize);
+ BP_SET_TYPE(bp, zp->zp_type);
+ BP_SET_LEVEL(bp, zp->zp_level);
BP_SET_PSIZE(bp, psize);
BP_SET_COMPRESS(bp, compress);
BP_SET_CHECKSUM(bp, zp->zp_checksum);
- BP_SET_TYPE(bp, zp->zp_type);
- BP_SET_LEVEL(bp, zp->zp_level);
BP_SET_DEDUP(bp, zp->zp_dedup);
BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
if (zp->zp_dedup) {
zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE);
}
+void
+zio_delay_interrupt(zio_t *zio)
+{
+ /*
+ * The timeout_generic() function isn't defined in userspace, so
+ * rather than trying to implement the function, the zio delay
+ * functionality has been disabled for userspace builds.
+ */
+
+#ifdef _KERNEL
+ /*
+ * If io_target_timestamp is zero, then no delay has been registered
+ * for this IO, thus jump to the end of this function and "skip" the
+ * delay; issuing it directly to the zio layer.
+ */
+ if (zio->io_target_timestamp != 0) {
+ hrtime_t now = gethrtime();
+
+ if (now >= zio->io_target_timestamp) {
+ /*
+ * This IO has already taken longer than the target
+ * delay to complete, so we don't want to delay it
+ * any longer; we "miss" the delay and issue it
+ * directly to the zio layer. This is likely due to
+ * the target latency being set to a value less than
+ * the underlying hardware can satisfy (e.g. delay
+ * set to 1ms, but the disks take 10ms to complete an
+ * IO request).
+ */
+
+ DTRACE_PROBE2(zio__delay__miss, zio_t *, zio,
+ hrtime_t, now);
+
+ zio_interrupt(zio);
+ } else {
+ taskqid_t tid;
+ hrtime_t diff = zio->io_target_timestamp - now;
+ clock_t expire_at_tick = ddi_get_lbolt() +
+ NSEC_TO_TICK(diff);
+
+ DTRACE_PROBE3(zio__delay__hit, zio_t *, zio,
+ hrtime_t, now, hrtime_t, diff);
+
+ if (NSEC_TO_TICK(diff) == 0) {
+ /* Our delay is less than a jiffy - just spin */
+ zfs_sleep_until(zio->io_target_timestamp);
+ } else {
+ /*
+ * Use taskq_dispatch_delay() in the place of
+ * OpenZFS's timeout_generic().
+ */
+ tid = taskq_dispatch_delay(system_taskq,
+ (task_func_t *) zio_interrupt,
+ zio, TQ_NOSLEEP, expire_at_tick);
+ if (!tid) {
+ /*
+ * Couldn't allocate a task. Just
+ * finish the zio without a delay.
+ */
+ zio_interrupt(zio);
+ }
+ }
+ }
+ return;
+ }
+#endif
+ DTRACE_PROBE1(zio__delay__skip, zio_t *, zio);
+ zio_interrupt(zio);
+}
+
/*
* Execute the I/O pipeline until one of the following occurs:
* (1) the I/O completes; (2) the pipeline stalls waiting for
void
zio_execute(zio_t *zio)
{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
__zio_execute(zio);
+ spl_fstrans_unmark(cookie);
+}
+
+/*
+ * Used to determine if in the current context the stack is sized large
+ * enough to allow zio_execute() to be called recursively. A minimum
+ * stack size of 16K is required to avoid needing to re-dispatch the zio.
+ */
+boolean_t
+zio_execute_stack_check(zio_t *zio)
+{
+#if !defined(HAVE_LARGE_STACKS)
+ dsl_pool_t *dp = spa_get_dsl(zio->io_spa);
+
+ /* Executing in txg_sync_thread() context. */
+ if (dp && curthread == dp->dp_tx.tx_sync_thread)
+ return (B_TRUE);
+
+ /* Pool initialization outside of zio_taskq context. */
+ if (dp && spa_is_initializing(dp->dp_spa) &&
+ !zio_taskq_member(zio, ZIO_TASKQ_ISSUE) &&
+ !zio_taskq_member(zio, ZIO_TASKQ_ISSUE_HIGH))
+ return (B_TRUE);
+#endif /* HAVE_LARGE_STACKS */
+
+ return (B_FALSE);
}
__attribute__((always_inline))
while (zio->io_stage < ZIO_STAGE_DONE) {
enum zio_stage pipeline = zio->io_pipeline;
enum zio_stage stage = zio->io_stage;
- dsl_pool_t *dp;
- boolean_t cut;
int rv;
ASSERT(!MUTEX_HELD(&zio->io_lock));
ASSERT(stage <= ZIO_STAGE_DONE);
- dp = spa_get_dsl(zio->io_spa);
- cut = (stage == ZIO_STAGE_VDEV_IO_START) ?
- zio_requeue_io_start_cut_in_line : B_FALSE;
-
/*
* If we are in interrupt context and this pipeline stage
* will grab a config lock that is held across I/O,
*/
if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL &&
zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) {
+ boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ?
+ zio_requeue_io_start_cut_in_line : B_FALSE;
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut);
return;
}
-#ifdef _KERNEL
/*
- * If we executing in the context of the tx_sync_thread,
- * or we are performing pool initialization outside of a
- * zio_taskq[ZIO_TASKQ_ISSUE|ZIO_TASKQ_ISSUE_HIGH] context.
- * Then issue the zio asynchronously to minimize stack usage
- * for these deep call paths.
+ * If the current context doesn't have large enough stacks
+ * the zio must be issued asynchronously to prevent overflow.
*/
- if ((dp && curthread == dp->dp_tx.tx_sync_thread) ||
- (dp && spa_is_initializing(dp->dp_spa) &&
- !zio_taskq_member(zio, ZIO_TASKQ_ISSUE) &&
- !zio_taskq_member(zio, ZIO_TASKQ_ISSUE_HIGH))) {
+ if (zio_execute_stack_check(zio)) {
+ boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ?
+ zio_requeue_io_start_cut_in_line : B_FALSE;
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut);
return;
}
-#endif
zio->io_stage = stage;
- rv = zio_pipeline[highbit(stage) - 1](zio);
+ rv = zio_pipeline[highbit64(stage) - 1](zio);
if (rv == ZIO_PIPELINE_STOP)
return;
if (zio->io_child_type == ZIO_CHILD_LOGICAL &&
zio_unique_parent(zio) == NULL) {
+ zio_t *pio;
+
/*
* This is a logical async I/O with no parent to wait for it.
* We add it to the spa_async_root_zio "Godfather" I/O which
* will ensure they complete prior to unloading the pool.
*/
spa_t *spa = zio->io_spa;
+ kpreempt_disable();
+ pio = spa->spa_async_zio_root[CPU_SEQID];
+ kpreempt_enable();
- zio_add_child(spa->spa_async_zio_root, zio);
+ zio_add_child(pio, zio);
}
__zio_execute(zio);
ASSERT(*gnpp == NULL);
- gn = kmem_zalloc(sizeof (*gn), KM_PUSHPAGE);
+ gn = kmem_zalloc(sizeof (*gn), KM_SLEEP);
gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE);
*gnpp = gn;
zio_write_gang_member_ready(zio_t *zio)
{
zio_t *pio = zio_unique_parent(zio);
- ASSERTV(zio_t *gio = zio->io_gang_leader;)
dva_t *cdva = zio->io_bp->blk_dva;
dva_t *pdva = pio->io_bp->blk_dva;
uint64_t asize;
int d;
+ ASSERTV(zio_t *gio = zio->io_gang_leader);
if (BP_IS_HOLE(zio->io_bp))
return;
if (ddp->ddp_phys_birth != 0) {
arc_buf_t *abuf = NULL;
- uint32_t aflags = ARC_WAIT;
+ arc_flags_t aflags = ARC_FLAG_WAIT;
blkptr_t blk = *zio->io_bp;
int error;
* Read and write to physical devices
* ==========================================================================
*/
+
+
+/*
+ * Issue an I/O to the underlying vdev. Typically the issue pipeline
+ * stops after this stage and will resume upon I/O completion.
+ * However, there are instances where the vdev layer may need to
+ * continue the pipeline when an I/O was not issued. Since the I/O
+ * that was sent to the vdev layer might be different than the one
+ * currently active in the pipeline (see vdev_queue_io()), we explicitly
+ * force the underlying vdev layers to call either zio_execute() or
+ * zio_interrupt() to ensure that the pipeline continues with the correct I/O.
+ */
static int
zio_vdev_io_start(zio_t *zio)
{
uint64_t align;
spa_t *spa = zio->io_spa;
+ zio->io_delay = 0;
+
ASSERT(zio->io_error == 0);
ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0);
/*
* The mirror_ops handle multiple DVAs in a single BP.
*/
- return (vdev_mirror_ops.vdev_op_io_start(zio));
+ vdev_mirror_ops.vdev_op_io_start(zio);
+ return (ZIO_PIPELINE_STOP);
}
/*
* can quickly react to certain workloads. In particular, we care
* about non-scrubbing, top-level reads and writes with the following
* characteristics:
- * - synchronous writes of user data to non-slog devices
+ * - synchronous writes of user data to non-slog devices
* - any reads of user data
* When these conditions are met, adjust the timestamp of spa_last_io
* which allows the scan thread to adjust its workload accordingly.
align = 1ULL << vd->vdev_top->vdev_ashift;
- if (P2PHASE(zio->io_size, align) != 0) {
+ if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) &&
+ P2PHASE(zio->io_size, align) != 0) {
+ /* Transform logical writes to be a full physical block size. */
uint64_t asize = P2ROUNDUP(zio->io_size, align);
char *abuf = zio_buf_alloc(asize);
ASSERT(vd == vd->vdev_top);
zio_push_transform(zio, abuf, asize, asize, zio_subblock);
}
- ASSERT(P2PHASE(zio->io_offset, align) == 0);
- ASSERT(P2PHASE(zio->io_size, align) == 0);
+ /*
+ * If this is not a physical io, make sure that it is properly aligned
+ * before proceeding.
+ */
+ if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) {
+ ASSERT0(P2PHASE(zio->io_offset, align));
+ ASSERT0(P2PHASE(zio->io_size, align));
+ } else {
+ /*
+ * For physical writes, we allow 512b aligned writes and assume
+ * the device will perform a read-modify-write as necessary.
+ */
+ ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE));
+ ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE));
+ }
+
VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa));
/*
if (vd->vdev_ops->vdev_op_leaf &&
(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) {
- if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0)
+ if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio))
return (ZIO_PIPELINE_CONTINUE);
if ((zio = vdev_queue_io(zio)) == NULL)
}
}
- return (vd->vdev_ops->vdev_op_io_start(zio));
+ zio->io_delay = gethrtime();
+ vd->vdev_ops->vdev_op_io_start(zio);
+ return (ZIO_PIPELINE_STOP);
}
static int
ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE);
+ if (zio->io_delay)
+ zio->io_delay = gethrtime() - zio->io_delay;
+
if (vd != NULL && vd->vdev_ops->vdev_op_leaf) {
vdev_queue_io_done(zio);
if ((error = zio_checksum_error(zio, &info)) != 0) {
zio->io_error = error;
- if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) {
+ if (error == ECKSUM &&
+ !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) {
zfs_ereport_start_checksum(zio->io_spa,
zio->io_vd, zio, zio->io_offset,
zio->io_size, NULL, &info);
/*
* ==========================================================================
* Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other.
- * An error of 0 indictes success. ENXIO indicates whole-device failure,
+ * An error of 0 indicates success. ENXIO indicates whole-device failure,
* which may be transient (e.g. unplugged) or permament. ECKSUM and EIO
* indicate errors that are specific to one I/O, and most likely permanent.
* Any other error is presumed to be worse because we weren't expecting it.
for (w = 0; w < ZIO_WAIT_TYPES; w++)
ASSERT(zio->io_children[c][w] == 0);
- if (zio->io_bp != NULL) {
+ if (zio->io_bp != NULL && !BP_IS_EMBEDDED(zio->io_bp)) {
ASSERT(zio->io_bp->blk_pad[0] == 0);
ASSERT(zio->io_bp->blk_pad[1] == 0);
- ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 ||
+ ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy,
+ sizeof (blkptr_t)) == 0 ||
(zio->io_bp == zio_unique_parent(zio)->io_bp));
if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(zio->io_bp) &&
zio->io_bp_override == NULL &&
!(zio->io_flags & ZIO_FLAG_IO_REPAIR)) {
ASSERT(!BP_SHOULD_BYTESWAP(zio->io_bp));
- ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp));
+ ASSERT3U(zio->io_prop.zp_copies, <=,
+ BP_GET_NDVAS(zio->io_bp));
ASSERT(BP_COUNT_GANG(zio->io_bp) == 0 ||
- (BP_COUNT_GANG(zio->io_bp) == BP_GET_NDVAS(zio->io_bp)));
+ (BP_COUNT_GANG(zio->io_bp) ==
+ BP_GET_NDVAS(zio->io_bp)));
}
if (zio->io_flags & ZIO_FLAG_NOPWRITE)
VERIFY(BP_EQUAL(zio->io_bp, &zio->io_bp_orig));
if (asize != zio->io_size) {
abuf = zio_buf_alloc(asize);
bcopy(zio->io_data, abuf, zio->io_size);
- bzero(abuf + zio->io_size, asize - zio->io_size);
+ bzero(abuf+zio->io_size, asize-zio->io_size);
}
zio->io_cksum_report = zcr->zcr_next;
* 30 seconds to complete, post an error described the I/O delay.
* We ignore these errors if the device is currently unavailable.
*/
- if (zio->io_delay >= MSEC_TO_TICK(zio_delay_max)) {
+ if (zio->io_delay >= MSEC2NSEC(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);
+ zio->io_vd, zio, 0, 0);
}
if (zio->io_error) {
* error and generate a logical data ereport.
*/
spa_log_error(zio->io_spa, zio);
- zfs_ereport_post(FM_EREPORT_ZFS_DATA, zio->io_spa, NULL, zio,
- 0, 0);
+ zfs_ereport_post(FM_EREPORT_ZFS_DATA, zio->io_spa,
+ NULL, zio, 0, 0);
}
}
}
if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp &&
- !BP_IS_HOLE(zio->io_bp) && !(zio->io_flags & ZIO_FLAG_NOPWRITE)) {
+ !BP_IS_HOLE(zio->io_bp) && !BP_IS_EMBEDDED(zio->io_bp) &&
+ !(zio->io_flags & ZIO_FLAG_NOPWRITE)) {
metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp);
}
zio_done
};
-/* dnp is the dnode for zb1->zb_object */
-boolean_t
-zbookmark_is_before(const dnode_phys_t *dnp, const zbookmark_t *zb1,
- const zbookmark_t *zb2)
-{
- uint64_t zb1nextL0, zb2thisobj;
- ASSERT(zb1->zb_objset == zb2->zb_objset);
- ASSERT(zb2->zb_level == 0);
+
+/*
+ * Compare two zbookmark_phys_t's to see which we would reach first in a
+ * pre-order traversal of the object tree.
+ *
+ * This is simple in every case aside from the meta-dnode object. For all other
+ * objects, we traverse them in order (object 1 before object 2, and so on).
+ * However, all of these objects are traversed while traversing object 0, since
+ * the data it points to is the list of objects. Thus, we need to convert to a
+ * canonical representation so we can compare meta-dnode bookmarks to
+ * non-meta-dnode bookmarks.
+ *
+ * We do this by calculating "equivalents" for each field of the zbookmark.
+ * zbookmarks outside of the meta-dnode use their own object and level, and
+ * calculate the level 0 equivalent (the first L0 blkid that is contained in the
+ * blocks this bookmark refers to) by multiplying their blkid by their span
+ * (the number of L0 blocks contained within one block at their level).
+ * zbookmarks inside the meta-dnode calculate their object equivalent
+ * (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use
+ * level + 1<<31 (any value larger than a level could ever be) for their level.
+ * This causes them to always compare before a bookmark in their object
+ * equivalent, compare appropriately to bookmarks in other objects, and to
+ * compare appropriately to other bookmarks in the meta-dnode.
+ */
+int
+zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, uint8_t ibs2,
+ const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2)
+{
/*
- * A bookmark in the deadlist is considered to be after
- * everything else.
+ * These variables represent the "equivalent" values for the zbookmark,
+ * after converting zbookmarks inside the meta dnode to their
+ * normal-object equivalents.
*/
- if (zb2->zb_object == DMU_DEADLIST_OBJECT)
- return (B_TRUE);
-
- /* The objset_phys_t isn't before anything. */
- if (dnp == NULL)
- return (B_FALSE);
+ uint64_t zb1obj, zb2obj;
+ uint64_t zb1L0, zb2L0;
+ uint64_t zb1level, zb2level;
- zb1nextL0 = (zb1->zb_blkid + 1) <<
- ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT));
+ if (zb1->zb_object == zb2->zb_object &&
+ zb1->zb_level == zb2->zb_level &&
+ zb1->zb_blkid == zb2->zb_blkid)
+ return (0);
- zb2thisobj = zb2->zb_object ? zb2->zb_object :
- zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT);
+ /*
+ * BP_SPANB calculates the span in blocks.
+ */
+ zb1L0 = (zb1->zb_blkid) * BP_SPANB(ibs1, zb1->zb_level);
+ zb2L0 = (zb2->zb_blkid) * BP_SPANB(ibs2, zb2->zb_level);
if (zb1->zb_object == DMU_META_DNODE_OBJECT) {
- uint64_t nextobj = zb1nextL0 *
- (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT;
- return (nextobj <= zb2thisobj);
+ zb1obj = zb1L0 * (dbss1 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT));
+ zb1L0 = 0;
+ zb1level = zb1->zb_level + COMPARE_META_LEVEL;
+ } else {
+ zb1obj = zb1->zb_object;
+ zb1level = zb1->zb_level;
}
- if (zb1->zb_object < zb2thisobj)
- return (B_TRUE);
- if (zb1->zb_object > zb2thisobj)
- return (B_FALSE);
- if (zb2->zb_object == DMU_META_DNODE_OBJECT)
+ if (zb2->zb_object == DMU_META_DNODE_OBJECT) {
+ zb2obj = zb2L0 * (dbss2 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT));
+ zb2L0 = 0;
+ zb2level = zb2->zb_level + COMPARE_META_LEVEL;
+ } else {
+ zb2obj = zb2->zb_object;
+ zb2level = zb2->zb_level;
+ }
+
+ /* Now that we have a canonical representation, do the comparison. */
+ if (zb1obj != zb2obj)
+ return (zb1obj < zb2obj ? -1 : 1);
+ else if (zb1L0 != zb2L0)
+ return (zb1L0 < zb2L0 ? -1 : 1);
+ else if (zb1level != zb2level)
+ return (zb1level > zb2level ? -1 : 1);
+ /*
+ * This can (theoretically) happen if the bookmarks have the same object
+ * and level, but different blkids, if the block sizes are not the same.
+ * There is presently no way to change the indirect block sizes
+ */
+ return (0);
+}
+
+/*
+ * This function checks the following: given that last_block is the place that
+ * our traversal stopped last time, does that guarantee that we've visited
+ * every node under subtree_root? Therefore, we can't just use the raw output
+ * of zbookmark_compare. We have to pass in a modified version of
+ * subtree_root; by incrementing the block id, and then checking whether
+ * last_block is before or equal to that, we can tell whether or not having
+ * visited last_block implies that all of subtree_root's children have been
+ * visited.
+ */
+boolean_t
+zbookmark_subtree_completed(const dnode_phys_t *dnp,
+ const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block)
+{
+ zbookmark_phys_t mod_zb = *subtree_root;
+ mod_zb.zb_blkid++;
+ ASSERT(last_block->zb_level == 0);
+
+ /* The objset_phys_t isn't before anything. */
+ if (dnp == NULL)
return (B_FALSE);
- return (zb1nextL0 <= zb2->zb_blkid);
+
+ /*
+ * We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the
+ * data block size in sectors, because that variable is only used if
+ * the bookmark refers to a block in the meta-dnode. Since we don't
+ * know without examining it what object it refers to, and there's no
+ * harm in passing in this value in other cases, we always pass it in.
+ *
+ * We pass in 0 for the indirect block size shift because zb2 must be
+ * level 0. The indirect block size is only used to calculate the span
+ * of the bookmark, but since the bookmark must be level 0, the span is
+ * always 1, so the math works out.
+ *
+ * If you make changes to how the zbookmark_compare code works, be sure
+ * to make sure that this code still works afterwards.
+ */
+ return (zbookmark_compare(dnp->dn_datablkszsec, dnp->dn_indblkshift,
+ 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT), 0, &mod_zb,
+ last_block) <= 0);
}
#if defined(_KERNEL) && defined(HAVE_SPL)
-/* Fault injection */
-EXPORT_SYMBOL(zio_injection_enabled);
-EXPORT_SYMBOL(zio_inject_fault);
-EXPORT_SYMBOL(zio_inject_list_next);
-EXPORT_SYMBOL(zio_clear_fault);
-EXPORT_SYMBOL(zio_handle_fault_injection);
-EXPORT_SYMBOL(zio_handle_device_injection);
-EXPORT_SYMBOL(zio_handle_label_injection);
EXPORT_SYMBOL(zio_type_name);
-
-module_param(zio_bulk_flags, int, 0644);
-MODULE_PARM_DESC(zio_bulk_flags, "Additional flags to pass to bulk buffers");
+EXPORT_SYMBOL(zio_buf_alloc);
+EXPORT_SYMBOL(zio_data_buf_alloc);
+EXPORT_SYMBOL(zio_buf_alloc_flags);
+EXPORT_SYMBOL(zio_buf_free);
+EXPORT_SYMBOL(zio_data_buf_free);
module_param(zio_delay_max, int, 0644);
MODULE_PARM_DESC(zio_delay_max, "Max zio millisec delay before posting event");
module_param(zfs_sync_pass_deferred_free, int, 0644);
MODULE_PARM_DESC(zfs_sync_pass_deferred_free,
- "defer frees starting in this pass");
+ "Defer frees starting in this pass");
module_param(zfs_sync_pass_dont_compress, int, 0644);
MODULE_PARM_DESC(zfs_sync_pass_dont_compress,
- "don't compress starting in this pass");
+ "Don't compress starting in this pass");
module_param(zfs_sync_pass_rewrite, int, 0644);
MODULE_PARM_DESC(zfs_sync_pass_rewrite,
- "rewrite new bps starting in this pass");
+ "Rewrite new bps starting in this pass");
#endif
projects / mirror_zfs.git / blobdiff