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Illumos #3888 

3888 zfs recv -F should destroy any snapshots created since
     the incremental source
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Peng Dai <peng.dai@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

References:
  https://www.illumos.org/issues/3888
  illumos/illumos-gate@34f2f8cf94

Porting notes:

1. Commit 1fde1e3720 wrapped a
   declaration in dsl_dataset_modified_since_lastsnap in ASSERTV().
   The ASSERTV() and local variable have been removed to avoid an
   unused variable warning.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Richard Yao <ryao@gentoo.org>
Issue #1775
This commit is contained in:
Matthew Ahrens 2013-07-29 10:55:16 -08:00 committed by Brian Behlendorf
parent 96c2e96193
commit 1958067629
5 changed files with 116 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/sys/dsl_dataset.h
View File

@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012 by Delphix. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
* Copyright (c) 2013 Steven Hartland. All rights reserved.
*/
@ -204,7 +204,8 @@ void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
dsl_dataset_t *snap);
void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);

21
include/sys/dsl_destroy.h
View File

@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012 by Delphix. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
*/
@ -35,15 +35,16 @@ struct nvlist;
struct dsl_dataset;
struct dmu_tx;
int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer,
struct nvlist *errlist);
int dsl_destroy_snapshot(const char *name, boolean_t defer);
int dsl_destroy_head(const char *name);
int dsl_destroy_head_check_impl(struct dsl_dataset *ds, int expected_holds);
void dsl_destroy_head_sync_impl(struct dsl_dataset *ds, struct dmu_tx *tx);
int dsl_destroy_inconsistent(const char *dsname, void *arg);
void dsl_destroy_snapshot_sync_impl(struct dsl_dataset *ds,
boolean_t defer, struct dmu_tx *tx);
int dsl_destroy_snapshots_nvl(struct nvlist *, boolean_t,
struct nvlist *);
int dsl_destroy_snapshot(const char *, boolean_t);
int dsl_destroy_head(const char *);
int dsl_destroy_head_check_impl(struct dsl_dataset *, int);
void dsl_destroy_head_sync_impl(struct dsl_dataset *, struct dmu_tx *);
int dsl_destroy_inconsistent(const char *, void *);
int dsl_destroy_snapshot_check_impl(struct dsl_dataset *, boolean_t);
void dsl_destroy_snapshot_sync_impl(struct dsl_dataset *,
boolean_t, struct dmu_tx *);
#ifdef __cplusplus
}

119
module/zfs/dmu_send.c
View File

@ -682,6 +682,7 @@ typedef struct dmu_recv_begin_arg {
const char *drba_origin;
dmu_recv_cookie_t *drba_cookie;
cred_t *drba_cred;
uint64_t drba_snapobj;
} dmu_recv_begin_arg_t;
static int
@ -692,11 +693,6 @@ recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
int error;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
/* must not have any changes since most recent snapshot */
if (!drba->drba_cookie->drc_force &&
dsl_dataset_modified_since_lastsnap(ds))
return (SET_ERROR(ETXTBSY));
/* temporary clone name must not exist */
error = zap_lookup(dp->dp_meta_objset,
ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
@ -712,41 +708,47 @@ recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
return (error == 0 ? EEXIST : error);
if (fromguid != 0) {
/* if incremental, most recent snapshot must match fromguid */
if (ds->ds_prev == NULL)
dsl_dataset_t *snap;
uint64_t obj = ds->ds_phys->ds_prev_snap_obj;
/* Find snapshot in this dir that matches fromguid. */
while (obj != 0) {
error = dsl_dataset_hold_obj(dp, obj, FTAG,
&snap);
if (error != 0)
return (SET_ERROR(ENODEV));
if (snap->ds_dir != ds->ds_dir) {
dsl_dataset_rele(snap, FTAG);
return (SET_ERROR(ENODEV));
}
if (snap->ds_phys->ds_guid == fromguid)
break;
obj = snap->ds_phys->ds_prev_snap_obj;
dsl_dataset_rele(snap, FTAG);
}
if (obj == 0)
return (SET_ERROR(ENODEV));
/*
* most recent snapshot must match fromguid, or there are no
* changes since the fromguid one
*/
if (ds->ds_prev->ds_phys->ds_guid != fromguid) {
uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
while (obj != 0) {
dsl_dataset_t *snap;
error = dsl_dataset_hold_obj(dp, obj, FTAG,
&snap);
if (error != 0)
return (SET_ERROR(ENODEV));
if (snap->ds_phys->ds_creation_txg < birth) {
dsl_dataset_rele(snap, FTAG);
return (SET_ERROR(ENODEV));
}
if (snap->ds_phys->ds_guid == fromguid) {
dsl_dataset_rele(snap, FTAG);
break; /* it's ok */
}
obj = snap->ds_phys->ds_prev_snap_obj;
if (drba->drba_cookie->drc_force) {
drba->drba_snapobj = obj;
} else {
/*
* If we are not forcing, there must be no
* changes since fromsnap.
*/
if (dsl_dataset_modified_since_snap(ds, snap)) {
dsl_dataset_rele(snap, FTAG);
return (SET_ERROR(ETXTBSY));
}
if (obj == 0)
return (SET_ERROR(ENODEV));
drba->drba_snapobj = ds->ds_prev->ds_object;
}
dsl_dataset_rele(snap, FTAG);
} else {
/* if full, most recent snapshot must be $ORIGIN */
if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
return (SET_ERROR(ENODEV));
drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj;
}
return (0);
@ -855,8 +857,14 @@ dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
if (error == 0) {
/* create temporary clone */
dsl_dataset_t *snap = NULL;
if (drba->drba_snapobj != 0) {
VERIFY0(dsl_dataset_hold_obj(dp,
drba->drba_snapobj, FTAG, &snap));
}
dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
ds->ds_prev, crflags, drba->drba_cred, tx);
snap, crflags, drba->drba_cred, tx);
dsl_dataset_rele(snap, FTAG);
dsl_dataset_rele(ds, FTAG);
} else {
dsl_dir_t *dd;
@ -1577,6 +1585,32 @@ dmu_recv_end_check(void *arg, dmu_tx_t *tx)
error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
if (error != 0)
return (error);
if (drc->drc_force) {
/*
* We will destroy any snapshots in tofs (i.e. before
* origin_head) that are after the origin (which is
* the snap before drc_ds, because drc_ds can not
* have any snaps of its own).
*/
uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
dsl_dataset_t *snap;
error = dsl_dataset_hold_obj(dp, obj, FTAG,
&snap);
if (error != 0)
return (error);
if (snap->ds_dir != origin_head->ds_dir)
error = SET_ERROR(EINVAL);
if (error == 0) {
error = dsl_destroy_snapshot_check_impl(
snap, B_FALSE);
}
obj = snap->ds_phys->ds_prev_snap_obj;
dsl_dataset_rele(snap, FTAG);
if (error != 0)
return (error);
}
}
error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
origin_head, drc->drc_force);
if (error != 0) {
@ -1611,6 +1645,27 @@ dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
&origin_head));
if (drc->drc_force) {
/*
* Destroy any snapshots of drc_tofs (origin_head)
* after the origin (the snap before drc_ds).
*/
uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
dsl_dataset_t *snap;
VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
&snap));
ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
obj = snap->ds_phys->ds_prev_snap_obj;
dsl_destroy_snapshot_sync_impl(snap,
B_FALSE, tx);
dsl_dataset_rele(snap, FTAG);
}
}
VERIFY3P(drc->drc_ds->ds_prev, ==,
origin_head->ds_prev);
dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
origin_head, tx);
dsl_dataset_snapshot_sync_impl(origin_head,

29
module/zfs/dsl_dataset.c
View File

@ -1516,16 +1516,14 @@ dsl_dataset_space(dsl_dataset_t *ds,
}
boolean_t
dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds)
dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
{
ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
ASSERT(dsl_pool_config_held(dp));
if (ds->ds_prev == NULL)
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
if (snap == NULL)
return (B_FALSE);
if (ds->ds_phys->ds_bp.blk_birth >
ds->ds_prev->ds_phys->ds_creation_txg) {
objset_t *os, *os_prev;
snap->ds_phys->ds_creation_txg) {
objset_t *os, *os_snap;
/*
* It may be that only the ZIL differs, because it was
* reset in the head. Don't count that as being
@ -1533,10 +1531,10 @@ dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds)
*/
if (dmu_objset_from_ds(ds, &os) != 0)
return (B_TRUE);
if (dmu_objset_from_ds(ds->ds_prev, &os_prev) != 0)
if (dmu_objset_from_ds(snap, &os_snap) != 0)
return (B_TRUE);
return (bcmp(&os->os_phys->os_meta_dnode,
&os_prev->os_phys->os_meta_dnode,
&os_snap->os_phys->os_meta_dnode,
sizeof (os->os_phys->os_meta_dnode)) != 0);
}
return (B_FALSE);
@ -2287,15 +2285,14 @@ dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
dsl_dataset_is_snapshot(origin_head))
return (SET_ERROR(EINVAL));
/* the branch point should be just before them */
if (clone->ds_prev != origin_head->ds_prev)
/* if we are not forcing, the branch point should be just before them */
if (!force && clone->ds_prev != origin_head->ds_prev)
return (SET_ERROR(EINVAL));
/* clone should be the clone (unless they are unrelated) */
if (clone->ds_prev != NULL &&
clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
origin_head->ds_object !=
clone->ds_prev->ds_phys->ds_next_snap_obj)
origin_head->ds_dir != clone->ds_prev->ds_dir)
return (SET_ERROR(EINVAL));
/* the clone should be a child of the origin */
@ -2303,7 +2300,8 @@ dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
return (SET_ERROR(EINVAL));
/* origin_head shouldn't be modified unless 'force' */
if (!force && dsl_dataset_modified_since_lastsnap(origin_head))
if (!force &&
dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
return (SET_ERROR(ETXTBSY));
/* origin_head should have no long holds (e.g. is not mounted) */
@ -2340,6 +2338,7 @@ dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
ASSERT(clone->ds_reserved == 0);
ASSERT(origin_head->ds_quota == 0 ||
clone->ds_phys->ds_unique_bytes <= origin_head->ds_quota);
ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
dmu_buf_will_dirty(clone->ds_dbuf, tx);
dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
@ -2943,7 +2942,7 @@ EXPORT_SYMBOL(dsl_dataset_get_holds);
EXPORT_SYMBOL(dsl_dataset_get_blkptr);
EXPORT_SYMBOL(dsl_dataset_set_blkptr);
EXPORT_SYMBOL(dsl_dataset_get_spa);
EXPORT_SYMBOL(dsl_dataset_modified_since_lastsnap);
EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
EXPORT_SYMBOL(dsl_dataset_space_written);
EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
EXPORT_SYMBOL(dsl_dataset_sync);

5
module/zfs/dsl_destroy.c
View File

@ -46,10 +46,7 @@ typedef struct dmu_snapshots_destroy_arg {
nvlist_t *dsda_errlist;
} dmu_snapshots_destroy_arg_t;
/*
* ds must be owned.
*/
static int
int
dsl_destroy_snapshot_check_impl(dsl_dataset_t *ds, boolean_t defer)
{
if (!dsl_dataset_is_snapshot(ds))