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usr / src / sys / contrib / openzfs / module / zfs /

📁 ..
📄 Makefile.in(4.57 KB)
📄 THIRDPARTYLICENSE.cityhash(1.03 KB)
📄 THIRDPARTYLICENSE.cityhash.descrip(39 B)
📄 abd.c(31.72 KB)
📄 aggsum.c(8.46 KB)
📄 arc.c(330.91 KB)
📄 blkptr.c(4.26 KB)
📄 bplist.c(2.38 KB)
📄 bpobj.c(27.82 KB)
📄 bptree.c(8.2 KB)
📄 bqueue.c(4.7 KB)
📄 btree.c(65.19 KB)
📄 dataset_kstats.c(6.32 KB)
📄 dbuf.c(141.84 KB)
📄 dbuf_stats.c(6.05 KB)
📄 ddt.c(28.01 KB)
📄 ddt_zap.c(4.38 KB)
📄 dmu.c(60.44 KB)
📄 dmu_diff.c(6.25 KB)
📄 dmu_object.c(14.73 KB)
📄 dmu_objset.c(79.38 KB)
📄 dmu_recv.c(98.69 KB)
📄 dmu_redact.c(37.09 KB)
📄 dmu_send.c(95.51 KB)
📄 dmu_traverse.c(21.98 KB)
📄 dmu_tx.c(40.13 KB)
📄 dmu_zfetch.c(13.56 KB)
📄 dnode.c(71.32 KB)
📄 dnode_sync.c(24.93 KB)
📄 dsl_bookmark.c(51.22 KB)
📄 dsl_crypt.c(78.06 KB)
📄 dsl_dataset.c(141.61 KB)
📄 dsl_deadlist.c(27.94 KB)
📄 dsl_deleg.c(19.92 KB)
📄 dsl_destroy.c(36.73 KB)
📄 dsl_dir.c(65.45 KB)
📄 dsl_pool.c(42.92 KB)
📄 dsl_prop.c(32.88 KB)
📄 dsl_scan.c(134.47 KB)
📄 dsl_synctask.c(7.94 KB)
📄 dsl_userhold.c(18.26 KB)
📄 edonr_zfs.c(3.21 KB)
📄 fm.c(39.75 KB)
📄 gzip.c(2.57 KB)
📄 hkdf.c(4.5 KB)
📄 lz4.c(26.46 KB)
📄 lzjb.c(3.85 KB)
📄 metaslab.c(190.62 KB)
📄 mmp.c(24.93 KB)
📄 multilist.c(12.21 KB)
📄 objlist.c(2.58 KB)
📄 pathname.c(2.52 KB)
📄 range_tree.c(24.9 KB)
📄 refcount.c(7.82 KB)
📄 rrwlock.c(10.82 KB)
📄 sa.c(59.23 KB)
📄 sha256.c(2.89 KB)
📄 skein_zfs.c(2.92 KB)
📄 spa.c(272.81 KB)
📄 spa_boot.c(1.28 KB)
📄 spa_checkpoint.c(21.54 KB)
📄 spa_config.c(16.97 KB)
📄 spa_errlog.c(11.35 KB)
📄 spa_history.c(17.75 KB)
📄 spa_log_spacemap.c(47.13 KB)
📄 spa_misc.c(75.4 KB)
📄 spa_stats.c(27.08 KB)
📄 space_map.c(31.45 KB)
📄 space_reftree.c(4.21 KB)
📄 txg.c(27.49 KB)
📄 uberblock.c(2.17 KB)
📄 unique.c(2.53 KB)
📄 vdev.c(143.91 KB)
📄 vdev_cache.c(11.71 KB)
📄 vdev_draid.c(96.86 KB)
📄 vdev_draid_rand.c(1.16 KB)
📄 vdev_indirect.c(60.83 KB)
📄 vdev_indirect_births.c(5.88 KB)
📄 vdev_indirect_mapping.c(18.06 KB)
📄 vdev_initialize.c(22.38 KB)
📄 vdev_label.c(57.52 KB)
📄 vdev_mirror.c(26.76 KB)
📄 vdev_missing.c(3.74 KB)
📄 vdev_queue.c(37.61 KB)
📄 vdev_raidz.c(76.09 KB)
📄 vdev_raidz_math.c(17.18 KB)
📄 vdev_raidz_math_aarch64_neon.c(112.13 KB)
📄 vdev_raidz_math_aarch64_neon_common.h(23.64 KB)
📄 vdev_raidz_math_aarch64_neonx2.c(5.39 KB)
📄 vdev_raidz_math_avx2.c(10.64 KB)
📄 vdev_raidz_math_avx512bw.c(10.93 KB)
📄 vdev_raidz_math_avx512f.c(17.9 KB)
📄 vdev_raidz_math_impl.h(34.78 KB)
📄 vdev_raidz_math_powerpc_altivec.c(213.46 KB)
📄 vdev_raidz_math_powerpc_altivec_common.h(22.62 KB)
📄 vdev_raidz_math_scalar.c(9.54 KB)
📄 vdev_raidz_math_sse2.c(25.84 KB)
📄 vdev_raidz_math_ssse3.c(118 KB)
📄 vdev_rebuild.c(34.65 KB)
📄 vdev_removal.c(72.08 KB)
📄 vdev_root.c(4.28 KB)
📄 vdev_trim.c(50.92 KB)
📄 zap.c(35.35 KB)
📄 zap_leaf.c(22.75 KB)
📄 zap_micro.c(42.18 KB)
📄 zcp.c(42.29 KB)
📄 zcp_get.c(21.01 KB)
📄 zcp_global.c(1.9 KB)
📄 zcp_iter.c(18.21 KB)
📄 zcp_set.c(2.37 KB)
📄 zcp_synctask.c(13.69 KB)
📄 zfeature.c(17.6 KB)
📄 zfs_byteswap.c(5.64 KB)
📄 zfs_fm.c(40.58 KB)
📄 zfs_fuid.c(19.69 KB)
📄 zfs_ioctl.c(195.48 KB)
📄 zfs_log.c(20.6 KB)
📄 zfs_onexit.c(5.09 KB)
📄 zfs_quota.c(12.93 KB)
📄 zfs_ratelimit.c(2.35 KB)
📄 zfs_replay.c(26.11 KB)
📄 zfs_rlock.c(20.38 KB)
📄 zfs_sa.c(13.09 KB)
📄 zfs_vnops.c(22 KB)
📄 zil.c(111.32 KB)
📄 zio.c(144.72 KB)
📄 zio_checksum.c(17.28 KB)
📄 zio_compress.c(5.92 KB)
📄 zio_inject.c(25.79 KB)
📄 zle.c(2.52 KB)
📄 zrlock.c(4.45 KB)
📄 zthr.c(16.41 KB)
📄 zvol.c(42.96 KB)

Editing: zfs_onexit.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2013, 2020 by Delphix. All rights reserved.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/sunddi.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_onexit.h>
#include <sys/zvol.h>

/*
 * ZFS kernel routines may add/delete callback routines to be invoked
 * upon process exit (triggered via the close operation from the /dev/zfs
 * driver).
 *
 * These cleanup callbacks are intended to allow for the accumulation
 * of kernel state across multiple ioctls.  User processes participate
 * simply by opening ZFS_DEV. This causes the ZFS driver to do create
 * some private data for the file descriptor and generating a unique
 * minor number. The process then passes along that file descriptor to
 * each ioctl that might have a cleanup operation.
 *
 * Consumers of the onexit routines should call zfs_onexit_fd_hold() early
 * on to validate the given fd and add a reference to its file table entry.
 * This allows the consumer to do its work and then add a callback, knowing
 * that zfs_onexit_add_cb() won't fail with EBADF.  When finished, consumers
 * should call zfs_onexit_fd_rele().
 *
 * A simple example is zfs_ioc_recv(), where we might create an AVL tree
 * with dataset/GUID mappings and then reuse that tree on subsequent
 * zfs_ioc_recv() calls.
 *
 * On the first zfs_ioc_recv() call, dmu_recv_stream() will kmem_alloc()
 * the AVL tree and pass it along with a callback function to
 * zfs_onexit_add_cb(). The zfs_onexit_add_cb() routine will register the
 * callback and return an action handle.
 *
 * The action handle is then passed from user space to subsequent
 * zfs_ioc_recv() calls, so that dmu_recv_stream() can fetch its AVL tree
 * by calling zfs_onexit_cb_data() with the device minor number and
 * action handle.
 *
 * If the user process exits abnormally, the callback is invoked implicitly
 * as part of the driver close operation.  Once the user space process is
 * finished with the accumulated kernel state, it can also just call close(2)
 * on the cleanup fd to trigger the cleanup callback.
 */

void
zfs_onexit_init(zfs_onexit_t **zop)
{
	zfs_onexit_t *zo;

zo = *zop = kmem_zalloc(sizeof (zfs_onexit_t), KM_SLEEP);
	mutex_init(&zo->zo_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&zo->zo_actions, sizeof (zfs_onexit_action_node_t),
	    offsetof(zfs_onexit_action_node_t, za_link));
}

void
zfs_onexit_destroy(zfs_onexit_t *zo)
{
	zfs_onexit_action_node_t *ap;

mutex_enter(&zo->zo_lock);
	while ((ap = list_head(&zo->zo_actions)) != NULL) {
		list_remove(&zo->zo_actions, ap);
		mutex_exit(&zo->zo_lock);
		ap->za_func(ap->za_data);
		kmem_free(ap, sizeof (zfs_onexit_action_node_t));
		mutex_enter(&zo->zo_lock);
	}
	mutex_exit(&zo->zo_lock);

list_destroy(&zo->zo_actions);
	mutex_destroy(&zo->zo_lock);
	kmem_free(zo, sizeof (zfs_onexit_t));
}

/*
 * Consumers might need to operate by minor number instead of fd, since
 * they might be running in another thread (e.g. txg_sync_thread). Callers
 * of this function must call zfs_onexit_fd_rele() when they're finished
 * using the minor number.
 */
int
zfs_onexit_fd_hold(int fd, minor_t *minorp)
{
	zfs_onexit_t *zo = NULL;
	int error;

error = zfsdev_getminor(fd, minorp);
	if (error) {
		zfs_onexit_fd_rele(fd);
		return (error);
	}

zo = zfsdev_get_state(*minorp, ZST_ONEXIT);
	if (zo == NULL) {
		zfs_onexit_fd_rele(fd);
		return (SET_ERROR(EBADF));
	}
	return (0);
}

void
zfs_onexit_fd_rele(int fd)
{
	zfs_file_put(fd);
}

static int
zfs_onexit_minor_to_state(minor_t minor, zfs_onexit_t **zo)
{
	*zo = zfsdev_get_state(minor, ZST_ONEXIT);
	if (*zo == NULL)
		return (SET_ERROR(EBADF));

return (0);
}

/*
 * Add a callback to be invoked when the calling process exits.
 */
int
zfs_onexit_add_cb(minor_t minor, void (*func)(void *), void *data,
    uint64_t *action_handle)
{
	zfs_onexit_t *zo;
	zfs_onexit_action_node_t *ap;
	int error;

error = zfs_onexit_minor_to_state(minor, &zo);
	if (error)
		return (error);

ap = kmem_alloc(sizeof (zfs_onexit_action_node_t), KM_SLEEP);
	list_link_init(&ap->za_link);
	ap->za_func = func;
	ap->za_data = data;

mutex_enter(&zo->zo_lock);
	list_insert_tail(&zo->zo_actions, ap);
	mutex_exit(&zo->zo_lock);
	if (action_handle)
		*action_handle = (uint64_t)(uintptr_t)ap;

return (0);
}

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Editing: zfs_onexit.c

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