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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: zrlock.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) 2014, 2015 by Delphix. All rights reserved.
 * Copyright 2016 The MathWorks, Inc. All rights reserved.
 */

/*
 * A Zero Reference Lock (ZRL) is a reference count that can lock out new
 * references only when the count is zero and only without waiting if the count
 * is not already zero. It is similar to a read-write lock in that it allows
 * multiple readers and only a single writer, but it does not allow a writer to
 * block while waiting for readers to exit, and therefore the question of
 * reader/writer priority is moot (no WRWANT bit). Since the equivalent of
 * rw_enter(&lock, RW_WRITER) is disallowed and only tryenter() is allowed, it
 * is perfectly safe for the same reader to acquire the same lock multiple
 * times. The fact that a ZRL is reentrant for readers (through multiple calls
 * to zrl_add()) makes it convenient for determining whether something is
 * actively referenced without the fuss of flagging lock ownership across
 * function calls.
 */
#include <sys/zrlock.h>
#include <sys/trace_zfs.h>

/*
 * A ZRL can be locked only while there are zero references, so ZRL_LOCKED is
 * treated as zero references.
 */
#define	ZRL_LOCKED	-1
#define	ZRL_DESTROYED	-2

void
zrl_init(zrlock_t *zrl)
{
	mutex_init(&zrl->zr_mtx, NULL, MUTEX_DEFAULT, NULL);
	zrl->zr_refcount = 0;
	cv_init(&zrl->zr_cv, NULL, CV_DEFAULT, NULL);
#ifdef	ZFS_DEBUG
	zrl->zr_owner = NULL;
	zrl->zr_caller = NULL;
#endif
}

void
zrl_destroy(zrlock_t *zrl)
{
	ASSERT0(zrl->zr_refcount);

mutex_destroy(&zrl->zr_mtx);
	zrl->zr_refcount = ZRL_DESTROYED;
	cv_destroy(&zrl->zr_cv);
}

void
zrl_add_impl(zrlock_t *zrl, const char *zc)
{
	for (;;) {
		uint32_t n = (uint32_t)zrl->zr_refcount;
		while (n != ZRL_LOCKED) {
			uint32_t cas = atomic_cas_32(
			    (uint32_t *)&zrl->zr_refcount, n, n + 1);
			if (cas == n) {
				ASSERT3S((int32_t)n, >=, 0);
#ifdef	ZFS_DEBUG
				if (zrl->zr_owner == curthread) {
					DTRACE_PROBE3(zrlock__reentry,
					    zrlock_t *, zrl,
					    kthread_t *, curthread,
					    uint32_t, n);
				}
				zrl->zr_owner = curthread;
				zrl->zr_caller = zc;
#endif
				return;
			}
			n = cas;
		}

mutex_enter(&zrl->zr_mtx);
		while (zrl->zr_refcount == ZRL_LOCKED) {
			cv_wait(&zrl->zr_cv, &zrl->zr_mtx);
		}
		mutex_exit(&zrl->zr_mtx);
	}
}

void
zrl_remove(zrlock_t *zrl)
{
	uint32_t n;

#ifdef	ZFS_DEBUG
	if (zrl->zr_owner == curthread) {
		zrl->zr_owner = NULL;
		zrl->zr_caller = NULL;
	}
#endif
	n = atomic_dec_32_nv((uint32_t *)&zrl->zr_refcount);
	ASSERT3S((int32_t)n, >=, 0);
}

int
zrl_tryenter(zrlock_t *zrl)
{
	uint32_t n = (uint32_t)zrl->zr_refcount;

if (n == 0) {
		uint32_t cas = atomic_cas_32(
		    (uint32_t *)&zrl->zr_refcount, 0, ZRL_LOCKED);
		if (cas == 0) {
#ifdef	ZFS_DEBUG
			ASSERT3P(zrl->zr_owner, ==, NULL);
			zrl->zr_owner = curthread;
#endif
			return (1);
		}
	}

ASSERT3S((int32_t)n, >, ZRL_DESTROYED);

return (0);
}

void
zrl_exit(zrlock_t *zrl)
{
	ASSERT3S(zrl->zr_refcount, ==, ZRL_LOCKED);

mutex_enter(&zrl->zr_mtx);
#ifdef	ZFS_DEBUG
	ASSERT3P(zrl->zr_owner, ==, curthread);
	zrl->zr_owner = NULL;
	membar_producer();	/* make sure the owner store happens first */
#endif
	zrl->zr_refcount = 0;
	cv_broadcast(&zrl->zr_cv);
	mutex_exit(&zrl->zr_mtx);
}

int
zrl_is_zero(zrlock_t *zrl)
{
	ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);

return (zrl->zr_refcount <= 0);
}

int
zrl_is_locked(zrlock_t *zrl)
{
	ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);

return (zrl->zr_refcount == ZRL_LOCKED);
}

#ifdef	ZFS_DEBUG
kthread_t *
zrl_owner(zrlock_t *zrl)
{
	return (zrl->zr_owner);
}
#endif

#if defined(_KERNEL)

EXPORT_SYMBOL(zrl_add_impl);
EXPORT_SYMBOL(zrl_remove);

#endif

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Editing: zrlock.c

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