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Add support for asynchronous zvol minor operations

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zfsonlinux issue #2217 - zvol minor operations: check snapdev
property before traversing snapshots of a dataset

zfsonlinux issue #3681 - lock order inversion between zvol_open()
and dsl_pool_sync()...zvol_rename_minors()

Create a per-pool zvol taskq for asynchronous zvol tasks.
There are a few key design decisions to be aware of.

* Each taskq must be single threaded to ensure tasks are always
  processed in the order in which they were dispatched.

* There is a taskq per-pool in order to keep the pools independent.
  This way if one pool is suspended it will not impact another.

* The preferred location to dispatch a zvol minor task is a sync
  task.  In this context there is easy access to the spa_t and
  minimal error handling is required because the sync task must
  succeed.

Support for asynchronous zvol minor operations address issue #3681.

Signed-off-by: Boris Protopopov <boris.protopopov@actifio.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2217
Closes #3678
Closes #3681
This commit is contained in:
Boris Protopopov
2014-03-22 05:07:14 -04:00
committed by Brian Behlendorf
parent eb0856779f
commit a0bd735adb
12 changed files with 485 additions and 217 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/dsl_destroy.c
+5 -3
View File
@@ -23,6 +23,7 @@
* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
* Copyright (c) 2013 Steven Hartland. All rights reserved.
* Copyright (c) 2013 by Joyent, Inc. All rights reserved.
* Copyright (c) 2016 Actifio, Inc. All rights reserved.
*/
#include <sys/zfs_context.h>
@@ -40,6 +41,7 @@
#include <sys/zfs_ioctl.h>
#include <sys/dsl_deleg.h>
#include <sys/dmu_impl.h>
#include <sys/zvol.h>
typedef struct dmu_snapshots_destroy_arg {
nvlist_t *dsda_snaps;
@@ -243,9 +245,6 @@ dsl_dataset_remove_clones_key(dsl_dataset_t *ds, uint64_t mintxg, dmu_tx_t *tx)
void
dsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx)
{
#ifdef ZFS_DEBUG
int err;
#endif
spa_feature_t f;
int after_branch_point = FALSE;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
@@ -441,6 +440,7 @@ dsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx)
#ifdef ZFS_DEBUG
{
uint64_t val;
int err;
err = dsl_dataset_snap_lookup(ds_head,
ds->ds_snapname, &val);
@@ -490,6 +490,7 @@ dsl_destroy_snapshot_sync(void *arg, dmu_tx_t *tx)
VERIFY0(dsl_dataset_hold(dp, nvpair_name(pair), FTAG, &ds));
dsl_destroy_snapshot_sync_impl(ds, dsda->dsda_defer, tx);
zvol_remove_minors(dp->dp_spa, nvpair_name(pair), B_TRUE);
dsl_dataset_rele(ds, FTAG);
}
}
@@ -889,6 +890,7 @@ dsl_destroy_head_sync(void *arg, dmu_tx_t *tx)
VERIFY0(dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds));
dsl_destroy_head_sync_impl(ds, tx);
zvol_remove_minors(dp->dp_spa, ddha->ddha_name, B_TRUE);
dsl_dataset_rele(ds, FTAG);
}