*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/dsl_pool.h>
#include <sys/dnode.h>
#include <sys/spa.h>
+#include <sys/spa_impl.h>
#include <sys/zio.h>
#include <sys/dmu_impl.h>
#include <sys/sa.h>
#include <sys/zfeature.h>
int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */
+int32_t send_holes_without_birth_time = 1;
typedef struct prefetch_data {
kmutex_t pd_mtx;
int pd_flags;
boolean_t pd_cancel;
boolean_t pd_exited;
+ zbookmark_phys_t pd_resume;
} prefetch_data_t;
typedef struct traverse_data {
int td_flags;
prefetch_data_t *td_pfd;
boolean_t td_paused;
+ uint64_t td_hole_birth_enabled_txg;
blkptr_cb_t *td_func;
void *td_arg;
+ boolean_t td_realloc_possible;
} traverse_data_t;
static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
* If we already visited this bp & everything below,
* don't bother doing it again.
*/
- if (zbookmark_is_before(dnp, zb, td->td_resume))
+ if (zbookmark_subtree_completed(dnp, zb, td->td_resume))
return (RESUME_SKIP_ALL);
/*
traverse_prefetch_metadata(traverse_data_t *td,
const blkptr_t *bp, const zbookmark_phys_t *zb)
{
- uint32_t flags = ARC_NOWAIT | ARC_PREFETCH;
+ arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH;
if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA))
return;
}
if (bp->blk_birth == 0) {
- if (spa_feature_is_active(td->td_spa, SPA_FEATURE_HOLE_BIRTH)) {
- /*
- * Since this block has a birth time of 0 it must be a
- * hole created before the SPA_FEATURE_HOLE_BIRTH
- * feature was enabled. If SPA_FEATURE_HOLE_BIRTH
- * was enabled before the min_txg for this traveral we
- * know the hole must have been created before the
- * min_txg for this traveral, so we can skip it. If
- * SPA_FEATURE_HOLE_BIRTH was enabled after the min_txg
- * for this traveral we cannot tell if the hole was
- * created before or after the min_txg for this
- * traversal, so we cannot skip it.
- */
- uint64_t hole_birth_enabled_txg;
- VERIFY(spa_feature_enabled_txg(td->td_spa,
- SPA_FEATURE_HOLE_BIRTH, &hole_birth_enabled_txg));
- if (hole_birth_enabled_txg < td->td_min_txg)
- return (0);
- }
+ /*
+ * Since this block has a birth time of 0 it must be one of
+ * two things: a hole created before the
+ * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole
+ * which has always been a hole in an object.
+ *
+ * If a file is written sparsely, then the unwritten parts of
+ * the file were "always holes" -- that is, they have been
+ * holes since this object was allocated. However, we (and
+ * our callers) can not necessarily tell when an object was
+ * allocated. Therefore, if it's possible that this object
+ * was freed and then its object number reused, we need to
+ * visit all the holes with birth==0.
+ *
+ * If it isn't possible that the object number was reused,
+ * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote
+ * all the blocks we will visit as part of this traversal,
+ * then this hole must have always existed, so we can skip
+ * it. We visit blocks born after (exclusive) td_min_txg.
+ *
+ * Note that the meta-dnode cannot be reallocated.
+ */
+ if (!send_holes_without_birth_time &&
+ (!td->td_realloc_possible ||
+ zb->zb_object == DMU_META_DNODE_OBJECT) &&
+ td->td_hole_birth_enabled_txg <= td->td_min_txg)
+ return (0);
} else if (bp->blk_birth <= td->td_min_txg) {
return (0);
}
mutex_enter(&pd->pd_mtx);
ASSERT(pd->pd_bytes_fetched >= 0);
while (pd->pd_bytes_fetched < size && !pd->pd_exited)
- cv_wait(&pd->pd_cv, &pd->pd_mtx);
+ cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
pd->pd_bytes_fetched -= size;
cv_broadcast(&pd->pd_cv);
mutex_exit(&pd->pd_mtx);
}
if (BP_GET_LEVEL(bp) > 0) {
- uint32_t flags = ARC_WAIT;
+ uint32_t flags = ARC_FLAG_WAIT;
int32_t i;
int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
zbookmark_phys_t *czb;
kmem_free(czb, sizeof (zbookmark_phys_t));
} else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
- uint32_t flags = ARC_WAIT;
+ uint32_t flags = ARC_FLAG_WAIT;
int32_t i;
int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
- dnode_phys_t *cdnp;
+ dnode_phys_t *child_dnp;
err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
if (err != 0)
goto post;
- cdnp = buf->b_data;
+ child_dnp = buf->b_data;
- for (i = 0; i < epb; i++) {
- prefetch_dnode_metadata(td, &cdnp[i], zb->zb_objset,
- zb->zb_blkid * epb + i);
+ for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
+ prefetch_dnode_metadata(td, &child_dnp[i],
+ zb->zb_objset, zb->zb_blkid * epb + i);
}
/* recursively visitbp() blocks below this */
- for (i = 0; i < epb; i++) {
- err = traverse_dnode(td, &cdnp[i], zb->zb_objset,
- zb->zb_blkid * epb + i);
+ for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
+ err = traverse_dnode(td, &child_dnp[i],
+ zb->zb_objset, zb->zb_blkid * epb + i);
if (err != 0)
break;
}
} else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
- uint32_t flags = ARC_WAIT;
+ arc_flags_t flags = ARC_FLAG_WAIT;
objset_phys_t *osp;
- dnode_phys_t *mdnp, *gdnp, *udnp;
err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
goto post;
osp = buf->b_data;
- mdnp = &osp->os_meta_dnode;
- gdnp = &osp->os_groupused_dnode;
- udnp = &osp->os_userused_dnode;
-
- prefetch_dnode_metadata(td, mdnp, zb->zb_objset,
+ prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset,
DMU_META_DNODE_OBJECT);
+ /*
+ * See the block comment above for the goal of this variable.
+ * If the maxblkid of the meta-dnode is 0, then we know that
+ * we've never had more than DNODES_PER_BLOCK objects in the
+ * dataset, which means we can't have reused any object ids.
+ */
+ if (osp->os_meta_dnode.dn_maxblkid == 0)
+ td->td_realloc_possible = B_FALSE;
+
if (arc_buf_size(buf) >= sizeof (objset_phys_t)) {
- prefetch_dnode_metadata(td, gdnp, zb->zb_objset,
- DMU_GROUPUSED_OBJECT);
- prefetch_dnode_metadata(td, udnp, zb->zb_objset,
- DMU_USERUSED_OBJECT);
+ prefetch_dnode_metadata(td, &osp->os_groupused_dnode,
+ zb->zb_objset, DMU_GROUPUSED_OBJECT);
+ prefetch_dnode_metadata(td, &osp->os_userused_dnode,
+ zb->zb_objset, DMU_USERUSED_OBJECT);
}
- err = traverse_dnode(td, mdnp, zb->zb_objset,
+ err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset,
DMU_META_DNODE_OBJECT);
if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) {
- err = traverse_dnode(td, gdnp, zb->zb_objset,
- DMU_GROUPUSED_OBJECT);
+ err = traverse_dnode(td, &osp->os_groupused_dnode,
+ zb->zb_objset, DMU_GROUPUSED_OBJECT);
}
if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) {
- err = traverse_dnode(td, udnp, zb->zb_objset,
- DMU_USERUSED_OBJECT);
+ err = traverse_dnode(td, &osp->os_userused_dnode,
+ zb->zb_objset, DMU_USERUSED_OBJECT);
}
}
if (buf)
- (void) arc_buf_remove_ref(buf, &buf);
+ arc_buf_destroy(buf, &buf);
post:
if (err == 0 && (td->td_flags & TRAVERSE_POST))
* Set the bookmark to the first level-0 block that we need
* to visit. This way, the resuming code does not need to
* deal with resuming from indirect blocks.
+ *
+ * Note, if zb_level <= 0, dnp may be NULL, so we don't want
+ * to dereference it.
*/
- td->td_resume->zb_blkid = zb->zb_blkid <<
- (zb->zb_level * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT));
+ td->td_resume->zb_blkid = zb->zb_blkid;
+ if (zb->zb_level > 0) {
+ td->td_resume->zb_blkid <<= zb->zb_level *
+ (dnp->dn_indblkshift - SPA_BLKPTRSHIFT);
+ }
td->td_paused = B_TRUE;
}
if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
- traverse_prefetch_metadata(td, &dnp->dn_spill, &czb);
+ traverse_prefetch_metadata(td, DN_SPILL_BLKPTR(dnp), &czb);
}
}
int j, err = 0;
zbookmark_phys_t czb;
+ if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL &&
+ object < td->td_resume->zb_object)
+ return (0);
+
+ if (td->td_flags & TRAVERSE_PRE) {
+ SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
+ ZB_DNODE_BLKID);
+ err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp,
+ td->td_arg);
+ if (err == TRAVERSE_VISIT_NO_CHILDREN)
+ return (0);
+ if (err != 0)
+ return (err);
+ }
+
for (j = 0; j < dnp->dn_nblkptr; j++) {
SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb);
break;
}
- if (err == 0 && dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
+ if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) {
SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
- err = traverse_visitbp(td, dnp, &dnp->dn_spill, &czb);
+ err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb);
+ }
+
+ if (err == 0 && (td->td_flags & TRAVERSE_POST)) {
+ SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
+ ZB_DNODE_BLKID);
+ err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp,
+ td->td_arg);
+ if (err == TRAVERSE_VISIT_NO_CHILDREN)
+ return (0);
+ if (err != 0)
+ return (err);
}
return (err);
}
const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
{
prefetch_data_t *pfd = arg;
- uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH;
+ arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH;
ASSERT(pfd->pd_bytes_fetched >= 0);
+ if (bp == NULL)
+ return (0);
if (pfd->pd_cancel)
return (SET_ERROR(EINTR));
mutex_enter(&pfd->pd_mtx);
while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max)
- cv_wait(&pfd->pd_cv, &pfd->pd_mtx);
+ cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx);
pfd->pd_bytes_fetched += BP_GET_LSIZE(bp);
cv_broadcast(&pfd->pd_cv);
mutex_exit(&pfd->pd_mtx);
traverse_data_t *td_main = arg;
traverse_data_t td = *td_main;
zbookmark_phys_t czb;
+ fstrans_cookie_t cookie = spl_fstrans_mark();
td.td_func = traverse_prefetcher;
td.td_arg = td_main->td_pfd;
td.td_pfd = NULL;
+ td.td_resume = &td_main->td_pfd->pd_resume;
SET_BOOKMARK(&czb, td.td_objset,
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
td_main->td_pfd->pd_exited = B_TRUE;
cv_broadcast(&td_main->td_pfd->pd_cv);
mutex_exit(&td_main->td_pfd->pd_mtx);
+ spl_fstrans_unmark(cookie);
}
/*
ASSERT(ds == NULL || objset == ds->ds_object);
ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));
- /*
- * The data prefetching mechanism (the prefetch thread) is incompatible
- * with resuming from a bookmark.
- */
- ASSERT(resume == NULL || !(flags & TRAVERSE_PREFETCH_DATA));
-
td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP);
pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP);
czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
td->td_pfd = pd;
td->td_flags = flags;
td->td_paused = B_FALSE;
+ td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE);
+
+ if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
+ VERIFY(spa_feature_enabled_txg(spa,
+ SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg));
+ } else {
+ td->td_hole_birth_enabled_txg = UINT64_MAX;
+ }
pd->pd_flags = flags;
+ if (resume != NULL)
+ pd->pd_resume = *resume;
mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL);
cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL);
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
/* See comment on ZIL traversal in dsl_scan_visitds. */
- if (ds != NULL && !dsl_dataset_is_snapshot(ds) && !BP_IS_HOLE(rootbp)) {
- uint32_t flags = ARC_WAIT;
+ if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) {
+ enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
+ uint32_t flags = ARC_FLAG_WAIT;
objset_phys_t *osp;
arc_buf_t *buf;
- err = arc_read(NULL, td->td_spa, rootbp,
- arc_getbuf_func, &buf,
- ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, czb);
- if (err != 0)
- return (err);
-
- osp = buf->b_data;
- traverse_zil(td, &osp->os_zil_header);
- (void) arc_buf_remove_ref(buf, &buf);
+ err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func,
+ &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb);
+ if (err != 0) {
+ /*
+ * If both TRAVERSE_HARD and TRAVERSE_PRE are set,
+ * continue to visitbp so that td_func can be called
+ * in pre stage, and err will reset to zero.
+ */
+ if (!(td->td_flags & TRAVERSE_HARD) ||
+ !(td->td_flags & TRAVERSE_PRE))
+ return (err);
+ } else {
+ osp = buf->b_data;
+ traverse_zil(td, &osp->os_zil_header);
+ arc_buf_destroy(buf, &buf);
+ }
}
if (!(flags & TRAVERSE_PREFETCH_DATA) ||
- 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread,
- td, TQ_NOQUEUE))
+ taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread,
+ td, TQ_NOQUEUE) == TASKQID_INVALID)
pd->pd_exited = B_TRUE;
err = traverse_visitbp(td, NULL, rootbp, czb);
pd->pd_cancel = B_TRUE;
cv_broadcast(&pd->pd_cv);
while (!pd->pd_exited)
- cv_wait(&pd->pd_cv, &pd->pd_mtx);
+ cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
mutex_exit(&pd->pd_mtx);
mutex_destroy(&pd->pd_mtx);
* in syncing context).
*/
int
-traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, int flags,
- blkptr_cb_t func, void *arg)
+traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start,
+ zbookmark_phys_t *resume,
+ int flags, blkptr_cb_t func, void *arg)
{
return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object,
- &ds->ds_phys->ds_bp, txg_start, NULL, flags, func, arg));
+ &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg));
+}
+
+int
+traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start,
+ int flags, blkptr_cb_t func, void *arg)
+{
+ return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg));
}
int
/* visit each dataset */
for (obj = 1; err == 0;
- err = dmu_object_next(mos, &obj, FALSE, txg_start)) {
+ err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) {
dmu_object_info_t doi;
err = dmu_object_info(mos, obj, &doi);
continue;
break;
}
- if (ds->ds_phys->ds_prev_snap_txg > txg)
- txg = ds->ds_phys->ds_prev_snap_txg;
+ if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg)
+ txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
err = traverse_dataset(ds, txg, flags, func, arg);
dsl_dataset_rele(ds, FTAG);
if (err != 0)
module_param(zfs_pd_bytes_max, int, 0644);
MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch");
+
+module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644);
+MODULE_PARM_DESC(ignore_hole_birth, "Alias for send_holes_without_birth_time");
+
+module_param_named(send_holes_without_birth_time,
+ send_holes_without_birth_time, int, 0644);
+MODULE_PARM_DESC(send_holes_without_birth_time,
+ "Ignore hole_birth txg for zfs send");
#endif
projects / mirror_zfs.git / blobdiff