Refactor zvol locking to minimise diff with upstream
Use #define zfsdev_state_lock spa_namespace_lock instead of replacing all zfsdev_state_lock with spa_namespace_lock to minimise changes from upstream. Differential Revision: D1302 MFC after: 1 month X-MFC-With r276063 Sponsored by: Multiplay
This commit is contained in:
Steven Hartland
parent
51f2504057
commit
08c0f91ecc
@ -110,11 +110,20 @@ static char *zvol_tag = "zvol_tag";
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#define ZVOL_DUMPSIZE "dumpsize"
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/*
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* The spa_namespace_lock protects the zfsdev_state structure from being
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* modified while it's being used, e.g. an open that comes in before a
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* create finishes. It also protects temporary opens of the dataset so that,
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* This lock protects the zfsdev_state structure from being modified
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* while it's being used, e.g. an open that comes in before a create
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* finishes. It also protects temporary opens of the dataset so that,
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* e.g., an open doesn't get a spurious EBUSY.
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*/
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#ifdef illumos
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kmutex_t zfsdev_state_lock;
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#else
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/*
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* In FreeBSD we've replaced the upstream zfsdev_state_lock with the
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* spa_namespace_lock in the ZVOL code.
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*/
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#define zfsdev_state_lock spa_namespace_lock
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#endif
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static uint32_t zvol_minors;
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SYSCTL_DECL(_vfs_zfs);
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@ -294,7 +303,7 @@ zvol_minor_lookup(const char *name)
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{
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zvol_state_t *zv;
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ASSERT(MUTEX_HELD(&spa_namespace_lock));
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ASSERT(MUTEX_HELD(&zfsdev_state_lock));
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LIST_FOREACH(zv, &all_zvols, zv_links) {
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if (strcmp(zv->zv_name, name) == 0)
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@ -523,11 +532,11 @@ zvol_name2minor(const char *name, minor_t *minor)
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{
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zvol_state_t *zv;
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mutex_enter(&spa_namespace_lock);
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mutex_enter(&zfsdev_state_lock);
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zv = zvol_minor_lookup(name);
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if (minor && zv)
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*minor = zv->zv_minor;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (zv ? 0 : -1);
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}
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#endif /* illumos */
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@ -550,10 +559,10 @@ zvol_create_minor(const char *name)
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ZFS_LOG(1, "Creating ZVOL %s...", name);
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mutex_enter(&spa_namespace_lock);
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mutex_enter(&zfsdev_state_lock);
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if (zvol_minor_lookup(name) != NULL) {
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(EEXIST));
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}
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@ -561,20 +570,20 @@ zvol_create_minor(const char *name)
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error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
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if (error) {
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (error);
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}
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#ifdef illumos
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if ((minor = zfsdev_minor_alloc()) == 0) {
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dmu_objset_disown(os, FTAG);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(ENXIO));
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}
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if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
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dmu_objset_disown(os, FTAG);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(EAGAIN));
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}
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(void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
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@ -586,7 +595,7 @@ zvol_create_minor(const char *name)
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minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
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ddi_soft_state_free(zfsdev_state, minor);
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dmu_objset_disown(os, FTAG);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(EAGAIN));
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}
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@ -597,7 +606,7 @@ zvol_create_minor(const char *name)
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ddi_remove_minor_node(zfs_dip, chrbuf);
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ddi_soft_state_free(zfsdev_state, minor);
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dmu_objset_disown(os, FTAG);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(EAGAIN));
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}
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@ -612,7 +621,7 @@ zvol_create_minor(const char *name)
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if (error) {
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kmem_free(zv, sizeof(*zv));
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dmu_objset_disown(os, zvol_tag);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (error);
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}
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error = dsl_prop_get_integer(name,
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@ -643,7 +652,7 @@ zvol_create_minor(const char *name)
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0640, "%s/%s", ZVOL_DRIVER, name) != 0) {
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kmem_free(zv, sizeof(*zv));
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dmu_objset_disown(os, FTAG);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(ENXIO));
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}
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zv->zv_dev = dev;
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@ -679,7 +688,7 @@ zvol_create_minor(const char *name)
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zvol_minors++;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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#ifndef illumos
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if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
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@ -704,7 +713,7 @@ zvol_remove_zv(zvol_state_t *zv)
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minor_t minor = zv->zv_minor;
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#endif
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ASSERT(MUTEX_HELD(&spa_namespace_lock));
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ASSERT(MUTEX_HELD(&zfsdev_state_lock));
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if (zv->zv_total_opens != 0)
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return (SET_ERROR(EBUSY));
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@ -738,13 +747,13 @@ zvol_remove_minor(const char *name)
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zvol_state_t *zv;
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int rc;
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mutex_enter(&spa_namespace_lock);
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mutex_enter(&zfsdev_state_lock);
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if ((zv = zvol_minor_lookup(name)) == NULL) {
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(ENXIO));
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}
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rc = zvol_remove_zv(zv);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (rc);
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}
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@ -856,7 +865,7 @@ zvol_update_volsize(objset_t *os, uint64_t volsize)
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dmu_tx_t *tx;
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int error;
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ASSERT(MUTEX_HELD(&spa_namespace_lock));
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ASSERT(MUTEX_HELD(&zfsdev_state_lock));
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tx = dmu_tx_create(os);
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dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
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@ -886,7 +895,7 @@ zvol_remove_minors(const char *name)
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namelen = strlen(name);
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DROP_GIANT();
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mutex_enter(&spa_namespace_lock);
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mutex_enter(&zfsdev_state_lock);
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LIST_FOREACH_SAFE(zv, &all_zvols, zv_links, tzv) {
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if (strcmp(zv->zv_name, name) == 0 ||
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@ -897,7 +906,7 @@ zvol_remove_minors(const char *name)
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}
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}
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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PICKUP_GIANT();
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}
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@ -911,10 +920,10 @@ zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
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uint64_t old_volsize = 0ULL;
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uint64_t readonly;
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mutex_enter(&spa_namespace_lock);
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mutex_enter(&zfsdev_state_lock);
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zv = zvol_minor_lookup(name);
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if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (error);
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}
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@ -981,7 +990,7 @@ zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
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out:
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dmu_objset_rele(os, FTAG);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (error);
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}
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@ -1005,15 +1014,15 @@ zvol_open(struct g_provider *pp, int flag, int count)
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* recursively, but that function already has all the
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* necessary protection.
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*/
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if (!MUTEX_HELD(&spa_namespace_lock)) {
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mutex_enter(&spa_namespace_lock);
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if (!MUTEX_HELD(&zfsdev_state_lock)) {
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mutex_enter(&zfsdev_state_lock);
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locked = B_TRUE;
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}
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zv = pp->private;
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if (zv == NULL) {
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if (locked)
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(ENXIO));
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}
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@ -1021,7 +1030,7 @@ zvol_open(struct g_provider *pp, int flag, int count)
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err = zvol_first_open(zv);
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if (err) {
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if (locked)
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (err);
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}
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pp->mediasize = zv->zv_volsize;
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@ -1048,14 +1057,14 @@ zvol_open(struct g_provider *pp, int flag, int count)
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zv->zv_total_opens += count;
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if (locked)
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (err);
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out:
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if (zv->zv_total_opens == 0)
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zvol_last_close(zv);
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if (locked)
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (err);
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}
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@ -1068,15 +1077,15 @@ zvol_close(struct g_provider *pp, int flag, int count)
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boolean_t locked = B_FALSE;
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/* See comment in zvol_open(). */
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if (!MUTEX_HELD(&spa_namespace_lock)) {
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mutex_enter(&spa_namespace_lock);
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if (!MUTEX_HELD(&zfsdev_state_lock)) {
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mutex_enter(&zfsdev_state_lock);
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locked = B_TRUE;
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}
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zv = pp->private;
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if (zv == NULL) {
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if (locked)
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(ENXIO));
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}
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@ -1100,7 +1109,7 @@ zvol_close(struct g_provider *pp, int flag, int count)
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zvol_last_close(zv);
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if (locked)
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (error);
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}
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@ -1844,12 +1853,12 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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int error = 0;
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rl_t *rl;
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mutex_enter(&spa_namespace_lock);
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mutex_enter(&zfsdev_state_lock);
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zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
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if (zv == NULL) {
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (SET_ERROR(ENXIO));
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}
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ASSERT(zv->zv_total_opens > 0);
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@ -1867,7 +1876,7 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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dki.dki_unit = getminor(dev);
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dki.dki_maxtransfer =
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1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs);
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
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error = SET_ERROR(EFAULT);
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return (error);
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@ -1881,7 +1890,7 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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dkm.dki_lbsize = 1U << zv->zv_min_bs;
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dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
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dkm.dki_media_type = DK_UNKNOWN;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
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error = SET_ERROR(EFAULT);
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return (error);
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@ -1896,7 +1905,7 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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dkmext.dki_pbsize = zv->zv_volblocksize;
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dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
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dkmext.dki_media_type = DK_UNKNOWN;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag))
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error = SET_ERROR(EFAULT);
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return (error);
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@ -1907,14 +1916,14 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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uint64_t vs = zv->zv_volsize;
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uint8_t bs = zv->zv_min_bs;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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error = zvol_getefi((void *)arg, flag, vs, bs);
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return (error);
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}
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case DKIOCFLUSHWRITECACHE:
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dkc = (struct dk_callback *)arg;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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zil_commit(zv->zv_zilog, ZVOL_OBJ);
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if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
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(*dkc->dkc_callback)(dkc->dkc_cookie, error);
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@ -1940,10 +1949,10 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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}
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if (wce) {
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zv->zv_flags |= ZVOL_WCE;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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} else {
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zv->zv_flags &= ~ZVOL_WCE;
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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zil_commit(zv->zv_zilog, ZVOL_OBJ);
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}
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return (0);
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@ -1995,7 +2004,7 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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if (df.df_start >= zv->zv_volsize)
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break; /* No need to do anything... */
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length,
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RL_WRITER);
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@ -2042,7 +2051,7 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
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break;
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}
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mutex_exit(&spa_namespace_lock);
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mutex_exit(&zfsdev_state_lock);
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return (error);
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}
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#endif /* illumos */
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@ -2058,12 +2067,19 @@ zvol_init(void)
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{
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VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
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1) == 0);
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#ifdef illumos
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mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
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#else
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ZFS_LOG(1, "ZVOL Initialized.");
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#endif
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}
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void
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zvol_fini(void)
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{
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#ifdef illumos
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mutex_destroy(&zfsdev_state_lock);
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#endif
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ddi_soft_state_fini(&zfsdev_state);
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ZFS_LOG(1, "ZVOL Deinitialized.");
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}
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@ -2101,7 +2117,7 @@ zvol_dump_init(zvol_state_t *zv, boolean_t resize)
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uint64_t version = spa_version(spa);
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enum zio_checksum checksum;
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ASSERT(MUTEX_HELD(&spa_namespace_lock));
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ASSERT(MUTEX_HELD(&zfsdev_state_lock));
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ASSERT(vd->vdev_ops == &vdev_root_ops);
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error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
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@ -2668,7 +2684,7 @@ zvol_rename_minor(zvol_state_t *zv, const char *newname)
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struct g_provider *pp;
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struct cdev *dev;
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ASSERT(MUTEX_HELD(&spa_namespace_lock));
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ASSERT(MUTEX_HELD(&zfsdev_state_lock));
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if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
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g_topology_lock();
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@ -2721,8 +2737,8 @@ zvol_rename_minors(const char *oldname, const char *newname)
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DROP_GIANT();
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/* See comment in zvol_open(). */
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if (!MUTEX_HELD(&spa_namespace_lock)) {
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mutex_enter(&spa_namespace_lock);
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||||
if (!MUTEX_HELD(&zfsdev_state_lock)) {
|
||||
mutex_enter(&zfsdev_state_lock);
|
||||
locked = B_TRUE;
|
||||
}
|
||||
|
||||
@ -2740,7 +2756,7 @@ zvol_rename_minors(const char *oldname, const char *newname)
|
||||
}
|
||||
|
||||
if (locked)
|
||||
mutex_exit(&spa_namespace_lock);
|
||||
mutex_exit(&zfsdev_state_lock);
|
||||
PICKUP_GIANT();
|
||||
}
|
||||
|
||||
@ -2750,17 +2766,17 @@ zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td)
|
||||
zvol_state_t *zv;
|
||||
int err = 0;
|
||||
|
||||
mutex_enter(&spa_namespace_lock);
|
||||
mutex_enter(&zfsdev_state_lock);
|
||||
zv = dev->si_drv2;
|
||||
if (zv == NULL) {
|
||||
mutex_exit(&spa_namespace_lock);
|
||||
mutex_exit(&zfsdev_state_lock);
|
||||
return(ENXIO); /* zvol_create_minor() not done yet */
|
||||
}
|
||||
|
||||
if (zv->zv_total_opens == 0)
|
||||
err = zvol_first_open(zv);
|
||||
if (err) {
|
||||
mutex_exit(&spa_namespace_lock);
|
||||
mutex_exit(&zfsdev_state_lock);
|
||||
return (err);
|
||||
}
|
||||
if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
|
||||
@ -2782,12 +2798,12 @@ zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td)
|
||||
#endif
|
||||
|
||||
zv->zv_total_opens++;
|
||||
mutex_exit(&spa_namespace_lock);
|
||||
mutex_exit(&zfsdev_state_lock);
|
||||
return (err);
|
||||
out:
|
||||
if (zv->zv_total_opens == 0)
|
||||
zvol_last_close(zv);
|
||||
mutex_exit(&spa_namespace_lock);
|
||||
mutex_exit(&zfsdev_state_lock);
|
||||
return (err);
|
||||
}
|
||||
|
||||
@ -2797,10 +2813,10 @@ zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td)
|
||||
zvol_state_t *zv;
|
||||
int err = 0;
|
||||
|
||||
mutex_enter(&spa_namespace_lock);
|
||||
mutex_enter(&zfsdev_state_lock);
|
||||
zv = dev->si_drv2;
|
||||
if (zv == NULL) {
|
||||
mutex_exit(&spa_namespace_lock);
|
||||
mutex_exit(&zfsdev_state_lock);
|
||||
return(ENXIO);
|
||||
}
|
||||
|
||||
@ -2823,7 +2839,7 @@ zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td)
|
||||
if (zv->zv_total_opens == 0)
|
||||
zvol_last_close(zv);
|
||||
|
||||
mutex_exit(&spa_namespace_lock);
|
||||
mutex_exit(&zfsdev_state_lock);
|
||||
return (0);
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user