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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_dataset.c
+6 -30
View File
@@ -24,6 +24,7 @@
* Copyright (c) 2014, Joyent, Inc. All rights reserved.
* Copyright (c) 2014 RackTop Systems.
* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
* Copyright (c) 2016 Actifio, Inc. All rights reserved.
*/
#include <sys/dmu_objset.h>
@@ -1424,6 +1425,7 @@ dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
dsl_props_set_sync_impl(ds->ds_prev,
ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
}
zvol_create_minors(dp->dp_spa, nvpair_name(pair), B_TRUE);
dsl_dataset_rele(ds, FTAG);
}
}
@@ -1498,16 +1500,6 @@ dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
fnvlist_free(suspended);
}
#ifdef _KERNEL
if (error == 0) {
for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
pair = nvlist_next_nvpair(snaps, pair)) {
char *snapname = nvpair_name(pair);
zvol_create_minors(snapname);
}
}
#endif
return (error);
}
@@ -1930,6 +1922,8 @@ dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
VERIFY0(zap_add(dp->dp_meta_objset,
dsl_dataset_phys(hds)->ds_snapnames_zapobj,
ds->ds_snapname, 8, 1, &ds->ds_object, tx));
zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname,
ddrsa->ddrsa_newsnapname, B_TRUE);
dsl_dataset_rele(ds, FTAG);
return (0);
@@ -1958,11 +1952,6 @@ int
dsl_dataset_rename_snapshot(const char *fsname,
const char *oldsnapname, const char *newsnapname, boolean_t recursive)
{
#ifdef _KERNEL
char *oldname, *newname;
#endif
int error;
dsl_dataset_rename_snapshot_arg_t ddrsa;
ddrsa.ddrsa_fsname = fsname;
@@ -1970,22 +1959,9 @@ dsl_dataset_rename_snapshot(const char *fsname,
ddrsa.ddrsa_newsnapname = newsnapname;
ddrsa.ddrsa_recursive = recursive;
error = dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
dsl_dataset_rename_snapshot_sync, &ddrsa,
1, ZFS_SPACE_CHECK_RESERVED);
if (error)
return (SET_ERROR(error));
#ifdef _KERNEL
oldname = kmem_asprintf("%s@%s", fsname, oldsnapname);
newname = kmem_asprintf("%s@%s", fsname, newsnapname);
zvol_rename_minors(oldname, newname);
strfree(newname);
strfree(oldname);
#endif
return (0);
1, ZFS_SPACE_CHECK_RESERVED));
}
/*