svn commit: r286682 - in vendor-sys/illumos/dist/uts/common/fs/zfs: . sys
Alexander Motin
mav at FreeBSD.org
Wed Aug 12 18:08:42 UTC 2015
Author: mav
Date: Wed Aug 12 18:08:40 2015
New Revision: 286682
URL: https://svnweb.freebsd.org/changeset/base/286682
Log:
5765 add support for estimating send stream size with lzc_send_space when so
urce is a bookmark
Reviewed by: Matthew Ahrens <mahrens at delphix.com>
Reviewed by: Christopher Siden <christopher.siden at delphix.com>
Reviewed by: Steven Hartland <killing at multiplay.co.uk>
Reviewed by: Bayard Bell <buffer.g.overflow at gmail.com>
Approved by: Albert Lee <trisk at nexenta.com>
illumos/illumos-gate at 643da460c8ca583e39ce053081754e24087f84c8
Modified:
vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c
vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu_send.h
vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_dataset.h
vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c Wed Aug 12 17:46:26 2015 (r286681)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c Wed Aug 12 18:08:40 2015 (r286682)
@@ -822,6 +822,40 @@ dmu_send(const char *tosnap, const char
return (err);
}
+static int
+dmu_adjust_send_estimate_for_indirects(dsl_dataset_t *ds, uint64_t size,
+ uint64_t *sizep)
+{
+ int err;
+ /*
+ * Assume that space (both on-disk and in-stream) is dominated by
+ * data. We will adjust for indirect blocks and the copies property,
+ * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
+ */
+
+ /*
+ * Subtract out approximate space used by indirect blocks.
+ * Assume most space is used by data blocks (non-indirect, non-dnode).
+ * Assume all blocks are recordsize. Assume ditto blocks and
+ * internal fragmentation counter out compression.
+ *
+ * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
+ * block, which we observe in practice.
+ */
+ uint64_t recordsize;
+ err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
+ if (err != 0)
+ return (err);
+ size -= size / recordsize * sizeof (blkptr_t);
+
+ /* Add in the space for the record associated with each block. */
+ size += size / recordsize * sizeof (dmu_replay_record_t);
+
+ *sizep = size;
+
+ return (0);
+}
+
int
dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
{
@@ -857,33 +891,61 @@ dmu_send_estimate(dsl_dataset_t *ds, dsl
return (err);
}
- /*
- * Assume that space (both on-disk and in-stream) is dominated by
- * data. We will adjust for indirect blocks and the copies property,
- * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
- */
+ err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep);
+ return (err);
+}
+
+/*
+ * Simple callback used to traverse the blocks of a snapshot and sum their
+ * uncompressed size
+ */
+/* ARGSUSED */
+static int
+dmu_calculate_send_traversal(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
+ const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
+{
+ uint64_t *spaceptr = arg;
+ if (bp != NULL && !BP_IS_HOLE(bp)) {
+ *spaceptr += BP_GET_UCSIZE(bp);
+ }
+ return (0);
+}
+
+/*
+ * Given a desination snapshot and a TXG, calculate the approximate size of a
+ * send stream sent from that TXG. from_txg may be zero, indicating that the
+ * whole snapshot will be sent.
+ */
+int
+dmu_send_estimate_from_txg(dsl_dataset_t *ds, uint64_t from_txg,
+ uint64_t *sizep)
+{
+ dsl_pool_t *dp = ds->ds_dir->dd_pool;
+ int err;
+ uint64_t size = 0;
+
+ ASSERT(dsl_pool_config_held(dp));
+
+ /* tosnap must be a snapshot */
+ if (!dsl_dataset_is_snapshot(ds))
+ return (SET_ERROR(EINVAL));
+
+ /* verify that from_txg is before the provided snapshot was taken */
+ if (from_txg >= dsl_dataset_phys(ds)->ds_creation_txg) {
+ return (SET_ERROR(EXDEV));
+ }
/*
- * Subtract out approximate space used by indirect blocks.
- * Assume most space is used by data blocks (non-indirect, non-dnode).
- * Assume all blocks are recordsize. Assume ditto blocks and
- * internal fragmentation counter out compression.
- *
- * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
- * block, which we observe in practice.
+ * traverse the blocks of the snapshot with birth times after
+ * from_txg, summing their uncompressed size
*/
- uint64_t recordsize;
- err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
- if (err != 0)
+ err = traverse_dataset(ds, from_txg, TRAVERSE_POST,
+ dmu_calculate_send_traversal, &size);
+ if (err)
return (err);
- size -= size / recordsize * sizeof (blkptr_t);
-
- /* Add in the space for the record associated with each block. */
- size += size / recordsize * sizeof (dmu_replay_record_t);
-
- *sizep = size;
- return (0);
+ err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep);
+ return (err);
}
typedef struct dmu_recv_begin_arg {
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu_send.h
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu_send.h Wed Aug 12 17:46:26 2015 (r286681)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu_send.h Wed Aug 12 18:08:40 2015 (r286682)
@@ -21,7 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2013, Joyent, Inc. All rights reserved.
*/
@@ -42,6 +42,8 @@ int dmu_send(const char *tosnap, const c
int outfd, struct vnode *vp, offset_t *off);
int dmu_send_estimate(struct dsl_dataset *ds, struct dsl_dataset *fromds,
uint64_t *sizep);
+int dmu_send_estimate_from_txg(struct dsl_dataset *ds, uint64_t fromtxg,
+ uint64_t *sizep);
int dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
boolean_t embedok, boolean_t large_block_ok,
int outfd, struct vnode *vp, offset_t *off);
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_dataset.h
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_dataset.h Wed Aug 12 17:46:26 2015 (r286681)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_dataset.h Wed Aug 12 18:08:40 2015 (r286682)
@@ -201,6 +201,9 @@ dsl_dataset_phys(dsl_dataset_t *ds)
*/
#define MAX_TAG_PREFIX_LEN 17
+#define dsl_dataset_is_snapshot(ds) \
+ (dsl_dataset_phys(ds)->ds_num_children != 0)
+
#define DS_UNIQUE_IS_ACCURATE(ds) \
((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c Wed Aug 12 17:46:26 2015 (r286681)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c Wed Aug 12 18:08:40 2015 (r286682)
@@ -5325,7 +5325,8 @@ zfs_ioc_send_new(const char *snapname, n
* of bytes that will be written to the fd supplied to zfs_ioc_send_new().
*
* innvl: {
- * (optional) "fromsnap" -> full snap name to send an incremental from
+ * (optional) "from" -> full snap or bookmark name to send an incremental
+ * from
* }
*
* outnvl: {
@@ -5336,7 +5337,6 @@ static int
zfs_ioc_send_space(const char *snapname, nvlist_t *innvl, nvlist_t *outnvl)
{
dsl_pool_t *dp;
- dsl_dataset_t *fromsnap = NULL;
dsl_dataset_t *tosnap;
int error;
char *fromname;
@@ -5352,27 +5352,55 @@ zfs_ioc_send_space(const char *snapname,
return (error);
}
- error = nvlist_lookup_string(innvl, "fromsnap", &fromname);
+ error = nvlist_lookup_string(innvl, "from", &fromname);
if (error == 0) {
- error = dsl_dataset_hold(dp, fromname, FTAG, &fromsnap);
- if (error != 0) {
- dsl_dataset_rele(tosnap, FTAG);
- dsl_pool_rele(dp, FTAG);
- return (error);
+ if (strchr(fromname, '@') != NULL) {
+ /*
+ * If from is a snapshot, hold it and use the more
+ * efficient dmu_send_estimate to estimate send space
+ * size using deadlists.
+ */
+ dsl_dataset_t *fromsnap;
+ error = dsl_dataset_hold(dp, fromname, FTAG, &fromsnap);
+ if (error != 0)
+ goto out;
+ error = dmu_send_estimate(tosnap, fromsnap, &space);
+ dsl_dataset_rele(fromsnap, FTAG);
+ } else if (strchr(fromname, '#') != NULL) {
+ /*
+ * If from is a bookmark, fetch the creation TXG of the
+ * snapshot it was created from and use that to find
+ * blocks that were born after it.
+ */
+ zfs_bookmark_phys_t frombm;
+
+ error = dsl_bookmark_lookup(dp, fromname, tosnap,
+ &frombm);
+ if (error != 0)
+ goto out;
+ error = dmu_send_estimate_from_txg(tosnap,
+ frombm.zbm_creation_txg, &space);
+ } else {
+ /*
+ * from is not properly formatted as a snapshot or
+ * bookmark
+ */
+ error = SET_ERROR(EINVAL);
+ goto out;
}
+ } else {
+ // If estimating the size of a full send, use dmu_send_estimate
+ error = dmu_send_estimate(tosnap, NULL, &space);
}
- error = dmu_send_estimate(tosnap, fromsnap, &space);
fnvlist_add_uint64(outnvl, "space", space);
- if (fromsnap != NULL)
- dsl_dataset_rele(fromsnap, FTAG);
+out:
dsl_dataset_rele(tosnap, FTAG);
dsl_pool_rele(dp, FTAG);
return (error);
}
-
static zfs_ioc_vec_t zfs_ioc_vec[ZFS_IOC_LAST - ZFS_IOC_FIRST];
static void
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