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`getfsstat(2)` is used to retrieve the list of mounted file systems, which libzfs uses when fetching properties like mountpoint, atime, setuid, etc. The `mode` parameter may be `MNT_NOWAIT`, which uses information in the VFS's cache, or `MNT_WAIT`, which effectively does a `statfs` on every single mounted file system in order to fetch the most up-to-date information. As far as I can tell, the only fields that libzfs cares about are the filesystem's name, mountpoint, fstypename, and mount flags. Those things are always updated on mount and unmount, so they will always be accurate in the VFS's mount cache except in two circumstances: 1) When a file system is busy unmounting 2) When a ZFS file system changes the value of a mount-overridable property like atime or setuid, but doesn't remount the file system. Right now that only happens when the property is changed by an unprivileged user who has delegated authority to change the property but not to mount the dataset. But perhaps libzfs could choose to do it for other reasons in the future. Switching to `MNT_NOWAIT` will greatly improve speed with no downside, as long as we explicitly update the mount cache whenever we change a mount-overridable property. For comparison, Illumos gets this information using the native `getmntany` and `getmntent` functions, which also use cached information. The illumos function that would refresh the cache, `resetmnttab`, is never called by libzfs. And on GNU/Linux, `getmntany` and `getmntent` don't even communicate with the kernel directly. They simply parse the file they are given, which is usually /etc/mtab or /proc/mounts. Perhaps the implementation of /proc/mounts is synchronous, ala MNT_WAIT; I don't know. Sponsored-by: Axcient Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alan Somers <asomers@gmail.com> Closes: #12091
179 lines
4.5 KiB
C
179 lines
4.5 KiB
C
/*
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* Copyright (c) 2020 iXsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/nvpair.h>
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#include <sys/spa_impl.h>
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#include <sys/vdev_os.h>
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#include <sys/zfs_vfsops.h>
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#include <sys/zone.h>
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#include <vm/vm_pageout.h>
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#include <sys/zfs_ioctl_impl.h>
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#if __FreeBSD_version < 1201517
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#define vm_page_max_user_wired vm_page_max_wired
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#endif
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int
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zfs_vfs_ref(zfsvfs_t **zfvp)
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{
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int error = 0;
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if (*zfvp == NULL)
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return (SET_ERROR(ESRCH));
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error = vfs_busy((*zfvp)->z_vfs, 0);
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if (error != 0) {
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*zfvp = NULL;
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error = SET_ERROR(ESRCH);
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}
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return (error);
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}
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int
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zfs_vfs_held(zfsvfs_t *zfsvfs)
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{
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return (zfsvfs->z_vfs != NULL);
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}
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void
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zfs_vfs_rele(zfsvfs_t *zfsvfs)
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{
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vfs_unbusy(zfsvfs->z_vfs);
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}
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static const zfs_ioc_key_t zfs_keys_nextboot[] = {
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{"command", DATA_TYPE_STRING, 0},
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{ ZPOOL_CONFIG_POOL_GUID, DATA_TYPE_UINT64, 0},
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{ ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64, 0}
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};
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static int
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zfs_ioc_jail(zfs_cmd_t *zc)
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{
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return (zone_dataset_attach(curthread->td_ucred, zc->zc_name,
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(int)zc->zc_zoneid));
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}
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static int
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zfs_ioc_unjail(zfs_cmd_t *zc)
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{
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return (zone_dataset_detach(curthread->td_ucred, zc->zc_name,
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(int)zc->zc_zoneid));
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}
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static int
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zfs_ioc_nextboot(const char *unused, nvlist_t *innvl, nvlist_t *outnvl)
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{
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char name[MAXNAMELEN];
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spa_t *spa;
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vdev_t *vd;
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char *command;
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uint64_t pool_guid;
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uint64_t vdev_guid;
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int error;
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if (nvlist_lookup_uint64(innvl,
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ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
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return (EINVAL);
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if (nvlist_lookup_uint64(innvl,
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ZPOOL_CONFIG_GUID, &vdev_guid) != 0)
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return (EINVAL);
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if (nvlist_lookup_string(innvl,
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"command", &command) != 0)
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return (EINVAL);
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mutex_enter(&spa_namespace_lock);
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spa = spa_by_guid(pool_guid, vdev_guid);
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if (spa != NULL)
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strcpy(name, spa_name(spa));
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mutex_exit(&spa_namespace_lock);
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if (spa == NULL)
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return (ENOENT);
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if ((error = spa_open(name, &spa, FTAG)) != 0)
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return (error);
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spa_vdev_state_enter(spa, SCL_ALL);
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vd = spa_lookup_by_guid(spa, vdev_guid, B_TRUE);
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if (vd == NULL) {
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(void) spa_vdev_state_exit(spa, NULL, ENXIO);
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spa_close(spa, FTAG);
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return (ENODEV);
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}
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error = vdev_label_write_pad2(vd, command, strlen(command));
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(void) spa_vdev_state_exit(spa, NULL, 0);
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txg_wait_synced(spa->spa_dsl_pool, 0);
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spa_close(spa, FTAG);
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return (error);
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}
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/* Update the VFS's cache of mountpoint properties */
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void
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zfs_ioctl_update_mount_cache(const char *dsname)
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{
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zfsvfs_t *zfsvfs;
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if (getzfsvfs(dsname, &zfsvfs) == 0) {
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struct mount *mp = zfsvfs->z_vfs;
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VFS_STATFS(mp, &mp->mnt_stat);
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zfs_vfs_rele(zfsvfs);
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}
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/*
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* Ignore errors; we can't do anything useful if either getzfsvfs or
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* VFS_STATFS fails.
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*/
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}
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uint64_t
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zfs_max_nvlist_src_size_os(void)
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{
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if (zfs_max_nvlist_src_size != 0)
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return (zfs_max_nvlist_src_size);
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return (ptob(vm_page_max_user_wired) / 4);
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}
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void
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zfs_ioctl_init_os(void)
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{
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zfs_ioctl_register_dataset_nolog(ZFS_IOC_JAIL, zfs_ioc_jail,
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zfs_secpolicy_config, POOL_CHECK_NONE);
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zfs_ioctl_register_dataset_nolog(ZFS_IOC_UNJAIL, zfs_ioc_unjail,
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zfs_secpolicy_config, POOL_CHECK_NONE);
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zfs_ioctl_register("fbsd_nextboot", ZFS_IOC_NEXTBOOT,
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zfs_ioc_nextboot, zfs_secpolicy_config, NO_NAME,
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POOL_CHECK_NONE, B_FALSE, B_FALSE, zfs_keys_nextboot, 3);
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}
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