| /* |
| * 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2012, 2018 by Delphix. All rights reserved. |
| */ |
| |
| /* Portions Copyright 2010 Robert Milkowski */ |
| |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <sys/sysmacros.h> |
| #include <sys/kmem.h> |
| #include <sys/pathname.h> |
| #include <sys/vnode.h> |
| #include <sys/vfs.h> |
| #include <sys/mntent.h> |
| #include <sys/cmn_err.h> |
| #include <sys/zfs_znode.h> |
| #include <sys/zfs_vnops.h> |
| #include <sys/zfs_dir.h> |
| #include <sys/zil.h> |
| #include <sys/fs/zfs.h> |
| #include <sys/dmu.h> |
| #include <sys/dsl_prop.h> |
| #include <sys/dsl_dataset.h> |
| #include <sys/dsl_deleg.h> |
| #include <sys/spa.h> |
| #include <sys/zap.h> |
| #include <sys/sa.h> |
| #include <sys/sa_impl.h> |
| #include <sys/policy.h> |
| #include <sys/atomic.h> |
| #include <sys/zfs_ioctl.h> |
| #include <sys/zfs_ctldir.h> |
| #include <sys/zfs_fuid.h> |
| #include <sys/zfs_quota.h> |
| #include <sys/sunddi.h> |
| #include <sys/dmu_objset.h> |
| #include <sys/dsl_dir.h> |
| #include <sys/spa_boot.h> |
| #include <sys/objlist.h> |
| #include <sys/zpl.h> |
| #include <linux/vfs_compat.h> |
| #include "zfs_comutil.h" |
| |
| enum { |
| TOKEN_RO, |
| TOKEN_RW, |
| TOKEN_SETUID, |
| TOKEN_NOSETUID, |
| TOKEN_EXEC, |
| TOKEN_NOEXEC, |
| TOKEN_DEVICES, |
| TOKEN_NODEVICES, |
| TOKEN_DIRXATTR, |
| TOKEN_SAXATTR, |
| TOKEN_XATTR, |
| TOKEN_NOXATTR, |
| TOKEN_ATIME, |
| TOKEN_NOATIME, |
| TOKEN_RELATIME, |
| TOKEN_NORELATIME, |
| TOKEN_NBMAND, |
| TOKEN_NONBMAND, |
| TOKEN_MNTPOINT, |
| TOKEN_LAST, |
| }; |
| |
| static const match_table_t zpl_tokens = { |
| { TOKEN_RO, MNTOPT_RO }, |
| { TOKEN_RW, MNTOPT_RW }, |
| { TOKEN_SETUID, MNTOPT_SETUID }, |
| { TOKEN_NOSETUID, MNTOPT_NOSETUID }, |
| { TOKEN_EXEC, MNTOPT_EXEC }, |
| { TOKEN_NOEXEC, MNTOPT_NOEXEC }, |
| { TOKEN_DEVICES, MNTOPT_DEVICES }, |
| { TOKEN_NODEVICES, MNTOPT_NODEVICES }, |
| { TOKEN_DIRXATTR, MNTOPT_DIRXATTR }, |
| { TOKEN_SAXATTR, MNTOPT_SAXATTR }, |
| { TOKEN_XATTR, MNTOPT_XATTR }, |
| { TOKEN_NOXATTR, MNTOPT_NOXATTR }, |
| { TOKEN_ATIME, MNTOPT_ATIME }, |
| { TOKEN_NOATIME, MNTOPT_NOATIME }, |
| { TOKEN_RELATIME, MNTOPT_RELATIME }, |
| { TOKEN_NORELATIME, MNTOPT_NORELATIME }, |
| { TOKEN_NBMAND, MNTOPT_NBMAND }, |
| { TOKEN_NONBMAND, MNTOPT_NONBMAND }, |
| { TOKEN_MNTPOINT, MNTOPT_MNTPOINT "=%s" }, |
| { TOKEN_LAST, NULL }, |
| }; |
| |
| static void |
| zfsvfs_vfs_free(vfs_t *vfsp) |
| { |
| if (vfsp != NULL) { |
| if (vfsp->vfs_mntpoint != NULL) |
| kmem_strfree(vfsp->vfs_mntpoint); |
| |
| kmem_free(vfsp, sizeof (vfs_t)); |
| } |
| } |
| |
| static int |
| zfsvfs_parse_option(char *option, int token, substring_t *args, vfs_t *vfsp) |
| { |
| switch (token) { |
| case TOKEN_RO: |
| vfsp->vfs_readonly = B_TRUE; |
| vfsp->vfs_do_readonly = B_TRUE; |
| break; |
| case TOKEN_RW: |
| vfsp->vfs_readonly = B_FALSE; |
| vfsp->vfs_do_readonly = B_TRUE; |
| break; |
| case TOKEN_SETUID: |
| vfsp->vfs_setuid = B_TRUE; |
| vfsp->vfs_do_setuid = B_TRUE; |
| break; |
| case TOKEN_NOSETUID: |
| vfsp->vfs_setuid = B_FALSE; |
| vfsp->vfs_do_setuid = B_TRUE; |
| break; |
| case TOKEN_EXEC: |
| vfsp->vfs_exec = B_TRUE; |
| vfsp->vfs_do_exec = B_TRUE; |
| break; |
| case TOKEN_NOEXEC: |
| vfsp->vfs_exec = B_FALSE; |
| vfsp->vfs_do_exec = B_TRUE; |
| break; |
| case TOKEN_DEVICES: |
| vfsp->vfs_devices = B_TRUE; |
| vfsp->vfs_do_devices = B_TRUE; |
| break; |
| case TOKEN_NODEVICES: |
| vfsp->vfs_devices = B_FALSE; |
| vfsp->vfs_do_devices = B_TRUE; |
| break; |
| case TOKEN_DIRXATTR: |
| vfsp->vfs_xattr = ZFS_XATTR_DIR; |
| vfsp->vfs_do_xattr = B_TRUE; |
| break; |
| case TOKEN_SAXATTR: |
| vfsp->vfs_xattr = ZFS_XATTR_SA; |
| vfsp->vfs_do_xattr = B_TRUE; |
| break; |
| case TOKEN_XATTR: |
| vfsp->vfs_xattr = ZFS_XATTR_DIR; |
| vfsp->vfs_do_xattr = B_TRUE; |
| break; |
| case TOKEN_NOXATTR: |
| vfsp->vfs_xattr = ZFS_XATTR_OFF; |
| vfsp->vfs_do_xattr = B_TRUE; |
| break; |
| case TOKEN_ATIME: |
| vfsp->vfs_atime = B_TRUE; |
| vfsp->vfs_do_atime = B_TRUE; |
| break; |
| case TOKEN_NOATIME: |
| vfsp->vfs_atime = B_FALSE; |
| vfsp->vfs_do_atime = B_TRUE; |
| break; |
| case TOKEN_RELATIME: |
| vfsp->vfs_relatime = B_TRUE; |
| vfsp->vfs_do_relatime = B_TRUE; |
| break; |
| case TOKEN_NORELATIME: |
| vfsp->vfs_relatime = B_FALSE; |
| vfsp->vfs_do_relatime = B_TRUE; |
| break; |
| case TOKEN_NBMAND: |
| vfsp->vfs_nbmand = B_TRUE; |
| vfsp->vfs_do_nbmand = B_TRUE; |
| break; |
| case TOKEN_NONBMAND: |
| vfsp->vfs_nbmand = B_FALSE; |
| vfsp->vfs_do_nbmand = B_TRUE; |
| break; |
| case TOKEN_MNTPOINT: |
| vfsp->vfs_mntpoint = match_strdup(&args[0]); |
| if (vfsp->vfs_mntpoint == NULL) |
| return (SET_ERROR(ENOMEM)); |
| |
| break; |
| default: |
| break; |
| } |
| |
| return (0); |
| } |
| |
| /* |
| * Parse the raw mntopts and return a vfs_t describing the options. |
| */ |
| static int |
| zfsvfs_parse_options(char *mntopts, vfs_t **vfsp) |
| { |
| vfs_t *tmp_vfsp; |
| int error; |
| |
| tmp_vfsp = kmem_zalloc(sizeof (vfs_t), KM_SLEEP); |
| |
| if (mntopts != NULL) { |
| substring_t args[MAX_OPT_ARGS]; |
| char *tmp_mntopts, *p, *t; |
| int token; |
| |
| tmp_mntopts = t = kmem_strdup(mntopts); |
| if (tmp_mntopts == NULL) |
| return (SET_ERROR(ENOMEM)); |
| |
| while ((p = strsep(&t, ",")) != NULL) { |
| if (!*p) |
| continue; |
| |
| args[0].to = args[0].from = NULL; |
| token = match_token(p, zpl_tokens, args); |
| error = zfsvfs_parse_option(p, token, args, tmp_vfsp); |
| if (error) { |
| kmem_strfree(tmp_mntopts); |
| zfsvfs_vfs_free(tmp_vfsp); |
| return (error); |
| } |
| } |
| |
| kmem_strfree(tmp_mntopts); |
| } |
| |
| *vfsp = tmp_vfsp; |
| |
| return (0); |
| } |
| |
| boolean_t |
| zfs_is_readonly(zfsvfs_t *zfsvfs) |
| { |
| return (!!(zfsvfs->z_sb->s_flags & SB_RDONLY)); |
| } |
| |
| /*ARGSUSED*/ |
| int |
| zfs_sync(struct super_block *sb, int wait, cred_t *cr) |
| { |
| zfsvfs_t *zfsvfs = sb->s_fs_info; |
| |
| /* |
| * Semantically, the only requirement is that the sync be initiated. |
| * The DMU syncs out txgs frequently, so there's nothing to do. |
| */ |
| if (!wait) |
| return (0); |
| |
| if (zfsvfs != NULL) { |
| /* |
| * Sync a specific filesystem. |
| */ |
| dsl_pool_t *dp; |
| |
| ZFS_ENTER(zfsvfs); |
| dp = dmu_objset_pool(zfsvfs->z_os); |
| |
| /* |
| * If the system is shutting down, then skip any |
| * filesystems which may exist on a suspended pool. |
| */ |
| if (spa_suspended(dp->dp_spa)) { |
| ZFS_EXIT(zfsvfs); |
| return (0); |
| } |
| |
| if (zfsvfs->z_log != NULL) |
| zil_commit(zfsvfs->z_log, 0); |
| |
| ZFS_EXIT(zfsvfs); |
| } else { |
| /* |
| * Sync all ZFS filesystems. This is what happens when you |
| * run sync(1). Unlike other filesystems, ZFS honors the |
| * request by waiting for all pools to commit all dirty data. |
| */ |
| spa_sync_allpools(); |
| } |
| |
| return (0); |
| } |
| |
| static void |
| atime_changed_cb(void *arg, uint64_t newval) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| struct super_block *sb = zfsvfs->z_sb; |
| |
| if (sb == NULL) |
| return; |
| /* |
| * Update SB_NOATIME bit in VFS super block. Since atime update is |
| * determined by atime_needs_update(), atime_needs_update() needs to |
| * return false if atime is turned off, and not unconditionally return |
| * false if atime is turned on. |
| */ |
| if (newval) |
| sb->s_flags &= ~SB_NOATIME; |
| else |
| sb->s_flags |= SB_NOATIME; |
| } |
| |
| static void |
| relatime_changed_cb(void *arg, uint64_t newval) |
| { |
| ((zfsvfs_t *)arg)->z_relatime = newval; |
| } |
| |
| static void |
| xattr_changed_cb(void *arg, uint64_t newval) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| |
| if (newval == ZFS_XATTR_OFF) { |
| zfsvfs->z_flags &= ~ZSB_XATTR; |
| } else { |
| zfsvfs->z_flags |= ZSB_XATTR; |
| |
| if (newval == ZFS_XATTR_SA) |
| zfsvfs->z_xattr_sa = B_TRUE; |
| else |
| zfsvfs->z_xattr_sa = B_FALSE; |
| } |
| } |
| |
| static void |
| acltype_changed_cb(void *arg, uint64_t newval) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| |
| switch (newval) { |
| case ZFS_ACLTYPE_NFSV4: |
| case ZFS_ACLTYPE_OFF: |
| zfsvfs->z_acl_type = ZFS_ACLTYPE_OFF; |
| zfsvfs->z_sb->s_flags &= ~SB_POSIXACL; |
| break; |
| case ZFS_ACLTYPE_POSIX: |
| #ifdef CONFIG_FS_POSIX_ACL |
| zfsvfs->z_acl_type = ZFS_ACLTYPE_POSIX; |
| zfsvfs->z_sb->s_flags |= SB_POSIXACL; |
| #else |
| zfsvfs->z_acl_type = ZFS_ACLTYPE_OFF; |
| zfsvfs->z_sb->s_flags &= ~SB_POSIXACL; |
| #endif /* CONFIG_FS_POSIX_ACL */ |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void |
| blksz_changed_cb(void *arg, uint64_t newval) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os))); |
| ASSERT3U(newval, >=, SPA_MINBLOCKSIZE); |
| ASSERT(ISP2(newval)); |
| |
| zfsvfs->z_max_blksz = newval; |
| } |
| |
| static void |
| readonly_changed_cb(void *arg, uint64_t newval) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| struct super_block *sb = zfsvfs->z_sb; |
| |
| if (sb == NULL) |
| return; |
| |
| if (newval) |
| sb->s_flags |= SB_RDONLY; |
| else |
| sb->s_flags &= ~SB_RDONLY; |
| } |
| |
| static void |
| devices_changed_cb(void *arg, uint64_t newval) |
| { |
| } |
| |
| static void |
| setuid_changed_cb(void *arg, uint64_t newval) |
| { |
| } |
| |
| static void |
| exec_changed_cb(void *arg, uint64_t newval) |
| { |
| } |
| |
| static void |
| nbmand_changed_cb(void *arg, uint64_t newval) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| struct super_block *sb = zfsvfs->z_sb; |
| |
| if (sb == NULL) |
| return; |
| |
| if (newval == TRUE) |
| sb->s_flags |= SB_MANDLOCK; |
| else |
| sb->s_flags &= ~SB_MANDLOCK; |
| } |
| |
| static void |
| snapdir_changed_cb(void *arg, uint64_t newval) |
| { |
| ((zfsvfs_t *)arg)->z_show_ctldir = newval; |
| } |
| |
| static void |
| vscan_changed_cb(void *arg, uint64_t newval) |
| { |
| ((zfsvfs_t *)arg)->z_vscan = newval; |
| } |
| |
| static void |
| acl_mode_changed_cb(void *arg, uint64_t newval) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| |
| zfsvfs->z_acl_mode = newval; |
| } |
| |
| static void |
| acl_inherit_changed_cb(void *arg, uint64_t newval) |
| { |
| ((zfsvfs_t *)arg)->z_acl_inherit = newval; |
| } |
| |
| static int |
| zfs_register_callbacks(vfs_t *vfsp) |
| { |
| struct dsl_dataset *ds = NULL; |
| objset_t *os = NULL; |
| zfsvfs_t *zfsvfs = NULL; |
| int error = 0; |
| |
| ASSERT(vfsp); |
| zfsvfs = vfsp->vfs_data; |
| ASSERT(zfsvfs); |
| os = zfsvfs->z_os; |
| |
| /* |
| * The act of registering our callbacks will destroy any mount |
| * options we may have. In order to enable temporary overrides |
| * of mount options, we stash away the current values and |
| * restore them after we register the callbacks. |
| */ |
| if (zfs_is_readonly(zfsvfs) || !spa_writeable(dmu_objset_spa(os))) { |
| vfsp->vfs_do_readonly = B_TRUE; |
| vfsp->vfs_readonly = B_TRUE; |
| } |
| |
| /* |
| * Register property callbacks. |
| * |
| * It would probably be fine to just check for i/o error from |
| * the first prop_register(), but I guess I like to go |
| * overboard... |
| */ |
| ds = dmu_objset_ds(os); |
| dsl_pool_config_enter(dmu_objset_pool(os), FTAG); |
| error = dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_RELATIME), relatime_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_ACLTYPE), acltype_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb, |
| zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs); |
| error = error ? error : dsl_prop_register(ds, |
| zfs_prop_to_name(ZFS_PROP_NBMAND), nbmand_changed_cb, zfsvfs); |
| dsl_pool_config_exit(dmu_objset_pool(os), FTAG); |
| if (error) |
| goto unregister; |
| |
| /* |
| * Invoke our callbacks to restore temporary mount options. |
| */ |
| if (vfsp->vfs_do_readonly) |
| readonly_changed_cb(zfsvfs, vfsp->vfs_readonly); |
| if (vfsp->vfs_do_setuid) |
| setuid_changed_cb(zfsvfs, vfsp->vfs_setuid); |
| if (vfsp->vfs_do_exec) |
| exec_changed_cb(zfsvfs, vfsp->vfs_exec); |
| if (vfsp->vfs_do_devices) |
| devices_changed_cb(zfsvfs, vfsp->vfs_devices); |
| if (vfsp->vfs_do_xattr) |
| xattr_changed_cb(zfsvfs, vfsp->vfs_xattr); |
| if (vfsp->vfs_do_atime) |
| atime_changed_cb(zfsvfs, vfsp->vfs_atime); |
| if (vfsp->vfs_do_relatime) |
| relatime_changed_cb(zfsvfs, vfsp->vfs_relatime); |
| if (vfsp->vfs_do_nbmand) |
| nbmand_changed_cb(zfsvfs, vfsp->vfs_nbmand); |
| |
| return (0); |
| |
| unregister: |
| dsl_prop_unregister_all(ds, zfsvfs); |
| return (error); |
| } |
| |
| /* |
| * Takes a dataset, a property, a value and that value's setpoint as |
| * found in the ZAP. Checks if the property has been changed in the vfs. |
| * If so, val and setpoint will be overwritten with updated content. |
| * Otherwise, they are left unchanged. |
| */ |
| int |
| zfs_get_temporary_prop(dsl_dataset_t *ds, zfs_prop_t zfs_prop, uint64_t *val, |
| char *setpoint) |
| { |
| int error; |
| zfsvfs_t *zfvp; |
| vfs_t *vfsp; |
| objset_t *os; |
| uint64_t tmp = *val; |
| |
| error = dmu_objset_from_ds(ds, &os); |
| if (error != 0) |
| return (error); |
| |
| if (dmu_objset_type(os) != DMU_OST_ZFS) |
| return (EINVAL); |
| |
| mutex_enter(&os->os_user_ptr_lock); |
| zfvp = dmu_objset_get_user(os); |
| mutex_exit(&os->os_user_ptr_lock); |
| if (zfvp == NULL) |
| return (ESRCH); |
| |
| vfsp = zfvp->z_vfs; |
| |
| switch (zfs_prop) { |
| case ZFS_PROP_ATIME: |
| if (vfsp->vfs_do_atime) |
| tmp = vfsp->vfs_atime; |
| break; |
| case ZFS_PROP_RELATIME: |
| if (vfsp->vfs_do_relatime) |
| tmp = vfsp->vfs_relatime; |
| break; |
| case ZFS_PROP_DEVICES: |
| if (vfsp->vfs_do_devices) |
| tmp = vfsp->vfs_devices; |
| break; |
| case ZFS_PROP_EXEC: |
| if (vfsp->vfs_do_exec) |
| tmp = vfsp->vfs_exec; |
| break; |
| case ZFS_PROP_SETUID: |
| if (vfsp->vfs_do_setuid) |
| tmp = vfsp->vfs_setuid; |
| break; |
| case ZFS_PROP_READONLY: |
| if (vfsp->vfs_do_readonly) |
| tmp = vfsp->vfs_readonly; |
| break; |
| case ZFS_PROP_XATTR: |
| if (vfsp->vfs_do_xattr) |
| tmp = vfsp->vfs_xattr; |
| break; |
| case ZFS_PROP_NBMAND: |
| if (vfsp->vfs_do_nbmand) |
| tmp = vfsp->vfs_nbmand; |
| break; |
| default: |
| return (ENOENT); |
| } |
| |
| if (tmp != *val) { |
| (void) strcpy(setpoint, "temporary"); |
| *val = tmp; |
| } |
| return (0); |
| } |
| |
| /* |
| * Associate this zfsvfs with the given objset, which must be owned. |
| * This will cache a bunch of on-disk state from the objset in the |
| * zfsvfs. |
| */ |
| static int |
| zfsvfs_init(zfsvfs_t *zfsvfs, objset_t *os) |
| { |
| int error; |
| uint64_t val; |
| |
| zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE; |
| zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; |
| zfsvfs->z_os = os; |
| |
| error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); |
| if (error != 0) |
| return (error); |
| if (zfsvfs->z_version > |
| zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { |
| (void) printk("Can't mount a version %lld file system " |
| "on a version %lld pool\n. Pool must be upgraded to mount " |
| "this file system.\n", (u_longlong_t)zfsvfs->z_version, |
| (u_longlong_t)spa_version(dmu_objset_spa(os))); |
| return (SET_ERROR(ENOTSUP)); |
| } |
| error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &val); |
| if (error != 0) |
| return (error); |
| zfsvfs->z_norm = (int)val; |
| |
| error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &val); |
| if (error != 0) |
| return (error); |
| zfsvfs->z_utf8 = (val != 0); |
| |
| error = zfs_get_zplprop(os, ZFS_PROP_CASE, &val); |
| if (error != 0) |
| return (error); |
| zfsvfs->z_case = (uint_t)val; |
| |
| if ((error = zfs_get_zplprop(os, ZFS_PROP_ACLTYPE, &val)) != 0) |
| return (error); |
| zfsvfs->z_acl_type = (uint_t)val; |
| |
| /* |
| * Fold case on file systems that are always or sometimes case |
| * insensitive. |
| */ |
| if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || |
| zfsvfs->z_case == ZFS_CASE_MIXED) |
| zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; |
| |
| zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); |
| zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); |
| |
| uint64_t sa_obj = 0; |
| if (zfsvfs->z_use_sa) { |
| /* should either have both of these objects or none */ |
| error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, |
| &sa_obj); |
| if (error != 0) |
| return (error); |
| |
| error = zfs_get_zplprop(os, ZFS_PROP_XATTR, &val); |
| if ((error == 0) && (val == ZFS_XATTR_SA)) |
| zfsvfs->z_xattr_sa = B_TRUE; |
| } |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, |
| &zfsvfs->z_root); |
| if (error != 0) |
| return (error); |
| ASSERT(zfsvfs->z_root != 0); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, |
| &zfsvfs->z_unlinkedobj); |
| if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, |
| zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], |
| 8, 1, &zfsvfs->z_userquota_obj); |
| if (error == ENOENT) |
| zfsvfs->z_userquota_obj = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, |
| zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], |
| 8, 1, &zfsvfs->z_groupquota_obj); |
| if (error == ENOENT) |
| zfsvfs->z_groupquota_obj = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, |
| zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTQUOTA], |
| 8, 1, &zfsvfs->z_projectquota_obj); |
| if (error == ENOENT) |
| zfsvfs->z_projectquota_obj = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, |
| zfs_userquota_prop_prefixes[ZFS_PROP_USEROBJQUOTA], |
| 8, 1, &zfsvfs->z_userobjquota_obj); |
| if (error == ENOENT) |
| zfsvfs->z_userobjquota_obj = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, |
| zfs_userquota_prop_prefixes[ZFS_PROP_GROUPOBJQUOTA], |
| 8, 1, &zfsvfs->z_groupobjquota_obj); |
| if (error == ENOENT) |
| zfsvfs->z_groupobjquota_obj = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, |
| zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTOBJQUOTA], |
| 8, 1, &zfsvfs->z_projectobjquota_obj); |
| if (error == ENOENT) |
| zfsvfs->z_projectobjquota_obj = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, |
| &zfsvfs->z_fuid_obj); |
| if (error == ENOENT) |
| zfsvfs->z_fuid_obj = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, |
| &zfsvfs->z_shares_dir); |
| if (error == ENOENT) |
| zfsvfs->z_shares_dir = 0; |
| else if (error != 0) |
| return (error); |
| |
| error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, |
| &zfsvfs->z_attr_table); |
| if (error != 0) |
| return (error); |
| |
| if (zfsvfs->z_version >= ZPL_VERSION_SA) |
| sa_register_update_callback(os, zfs_sa_upgrade); |
| |
| return (0); |
| } |
| |
| int |
| zfsvfs_create(const char *osname, boolean_t readonly, zfsvfs_t **zfvp) |
| { |
| objset_t *os; |
| zfsvfs_t *zfsvfs; |
| int error; |
| boolean_t ro = (readonly || (strchr(osname, '@') != NULL)); |
| |
| zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); |
| |
| error = dmu_objset_own(osname, DMU_OST_ZFS, ro, B_TRUE, zfsvfs, &os); |
| if (error != 0) { |
| kmem_free(zfsvfs, sizeof (zfsvfs_t)); |
| return (error); |
| } |
| |
| error = zfsvfs_create_impl(zfvp, zfsvfs, os); |
| |
| return (error); |
| } |
| |
| |
| /* |
| * Note: zfsvfs is assumed to be malloc'd, and will be freed by this function |
| * on a failure. Do not pass in a statically allocated zfsvfs. |
| */ |
| int |
| zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os) |
| { |
| int error; |
| |
| zfsvfs->z_vfs = NULL; |
| zfsvfs->z_sb = NULL; |
| zfsvfs->z_parent = zfsvfs; |
| |
| mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); |
| mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); |
| list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), |
| offsetof(znode_t, z_link_node)); |
| ZFS_TEARDOWN_INIT(zfsvfs); |
| rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); |
| rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); |
| |
| int size = MIN(1 << (highbit64(zfs_object_mutex_size) - 1), |
| ZFS_OBJ_MTX_MAX); |
| zfsvfs->z_hold_size = size; |
| zfsvfs->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size, |
| KM_SLEEP); |
| zfsvfs->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP); |
| for (int i = 0; i != size; i++) { |
| avl_create(&zfsvfs->z_hold_trees[i], zfs_znode_hold_compare, |
| sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node)); |
| mutex_init(&zfsvfs->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL); |
| } |
| |
| error = zfsvfs_init(zfsvfs, os); |
| if (error != 0) { |
| dmu_objset_disown(os, B_TRUE, zfsvfs); |
| *zfvp = NULL; |
| zfsvfs_free(zfsvfs); |
| return (error); |
| } |
| |
| zfsvfs->z_drain_task = TASKQID_INVALID; |
| zfsvfs->z_draining = B_FALSE; |
| zfsvfs->z_drain_cancel = B_TRUE; |
| |
| *zfvp = zfsvfs; |
| return (0); |
| } |
| |
| static int |
| zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) |
| { |
| int error; |
| boolean_t readonly = zfs_is_readonly(zfsvfs); |
| |
| error = zfs_register_callbacks(zfsvfs->z_vfs); |
| if (error) |
| return (error); |
| |
| zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); |
| |
| /* |
| * If we are not mounting (ie: online recv), then we don't |
| * have to worry about replaying the log as we blocked all |
| * operations out since we closed the ZIL. |
| */ |
| if (mounting) { |
| ASSERT3P(zfsvfs->z_kstat.dk_kstats, ==, NULL); |
| dataset_kstats_create(&zfsvfs->z_kstat, zfsvfs->z_os); |
| |
| /* |
| * During replay we remove the read only flag to |
| * allow replays to succeed. |
| */ |
| if (readonly != 0) { |
| readonly_changed_cb(zfsvfs, B_FALSE); |
| } else { |
| zap_stats_t zs; |
| if (zap_get_stats(zfsvfs->z_os, zfsvfs->z_unlinkedobj, |
| &zs) == 0) { |
| dataset_kstats_update_nunlinks_kstat( |
| &zfsvfs->z_kstat, zs.zs_num_entries); |
| dprintf_ds(zfsvfs->z_os->os_dsl_dataset, |
| "num_entries in unlinked set: %llu", |
| zs.zs_num_entries); |
| } |
| zfs_unlinked_drain(zfsvfs); |
| dsl_dir_t *dd = zfsvfs->z_os->os_dsl_dataset->ds_dir; |
| dd->dd_activity_cancelled = B_FALSE; |
| } |
| |
| /* |
| * Parse and replay the intent log. |
| * |
| * Because of ziltest, this must be done after |
| * zfs_unlinked_drain(). (Further note: ziltest |
| * doesn't use readonly mounts, where |
| * zfs_unlinked_drain() isn't called.) This is because |
| * ziltest causes spa_sync() to think it's committed, |
| * but actually it is not, so the intent log contains |
| * many txg's worth of changes. |
| * |
| * In particular, if object N is in the unlinked set in |
| * the last txg to actually sync, then it could be |
| * actually freed in a later txg and then reallocated |
| * in a yet later txg. This would write a "create |
| * object N" record to the intent log. Normally, this |
| * would be fine because the spa_sync() would have |
| * written out the fact that object N is free, before |
| * we could write the "create object N" intent log |
| * record. |
| * |
| * But when we are in ziltest mode, we advance the "open |
| * txg" without actually spa_sync()-ing the changes to |
| * disk. So we would see that object N is still |
| * allocated and in the unlinked set, and there is an |
| * intent log record saying to allocate it. |
| */ |
| if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { |
| if (zil_replay_disable) { |
| zil_destroy(zfsvfs->z_log, B_FALSE); |
| } else { |
| zfsvfs->z_replay = B_TRUE; |
| zil_replay(zfsvfs->z_os, zfsvfs, |
| zfs_replay_vector); |
| zfsvfs->z_replay = B_FALSE; |
| } |
| } |
| |
| /* restore readonly bit */ |
| if (readonly != 0) |
| readonly_changed_cb(zfsvfs, B_TRUE); |
| } |
| |
| /* |
| * Set the objset user_ptr to track its zfsvfs. |
| */ |
| mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); |
| dmu_objset_set_user(zfsvfs->z_os, zfsvfs); |
| mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); |
| |
| return (0); |
| } |
| |
| void |
| zfsvfs_free(zfsvfs_t *zfsvfs) |
| { |
| int i, size = zfsvfs->z_hold_size; |
| |
| zfs_fuid_destroy(zfsvfs); |
| |
| mutex_destroy(&zfsvfs->z_znodes_lock); |
| mutex_destroy(&zfsvfs->z_lock); |
| list_destroy(&zfsvfs->z_all_znodes); |
| ZFS_TEARDOWN_DESTROY(zfsvfs); |
| rw_destroy(&zfsvfs->z_teardown_inactive_lock); |
| rw_destroy(&zfsvfs->z_fuid_lock); |
| for (i = 0; i != size; i++) { |
| avl_destroy(&zfsvfs->z_hold_trees[i]); |
| mutex_destroy(&zfsvfs->z_hold_locks[i]); |
| } |
| vmem_free(zfsvfs->z_hold_trees, sizeof (avl_tree_t) * size); |
| vmem_free(zfsvfs->z_hold_locks, sizeof (kmutex_t) * size); |
| zfsvfs_vfs_free(zfsvfs->z_vfs); |
| dataset_kstats_destroy(&zfsvfs->z_kstat); |
| kmem_free(zfsvfs, sizeof (zfsvfs_t)); |
| } |
| |
| static void |
| zfs_set_fuid_feature(zfsvfs_t *zfsvfs) |
| { |
| zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); |
| zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); |
| } |
| |
| static void |
| zfs_unregister_callbacks(zfsvfs_t *zfsvfs) |
| { |
| objset_t *os = zfsvfs->z_os; |
| |
| if (!dmu_objset_is_snapshot(os)) |
| dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs); |
| } |
| |
| #ifdef HAVE_MLSLABEL |
| /* |
| * Check that the hex label string is appropriate for the dataset being |
| * mounted into the global_zone proper. |
| * |
| * Return an error if the hex label string is not default or |
| * admin_low/admin_high. For admin_low labels, the corresponding |
| * dataset must be readonly. |
| */ |
| int |
| zfs_check_global_label(const char *dsname, const char *hexsl) |
| { |
| if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) |
| return (0); |
| if (strcasecmp(hexsl, ADMIN_HIGH) == 0) |
| return (0); |
| if (strcasecmp(hexsl, ADMIN_LOW) == 0) { |
| /* must be readonly */ |
| uint64_t rdonly; |
| |
| if (dsl_prop_get_integer(dsname, |
| zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) |
| return (SET_ERROR(EACCES)); |
| return (rdonly ? 0 : SET_ERROR(EACCES)); |
| } |
| return (SET_ERROR(EACCES)); |
| } |
| #endif /* HAVE_MLSLABEL */ |
| |
| static int |
| zfs_statfs_project(zfsvfs_t *zfsvfs, znode_t *zp, struct kstatfs *statp, |
| uint32_t bshift) |
| { |
| char buf[20 + DMU_OBJACCT_PREFIX_LEN]; |
| uint64_t offset = DMU_OBJACCT_PREFIX_LEN; |
| uint64_t quota; |
| uint64_t used; |
| int err; |
| |
| strlcpy(buf, DMU_OBJACCT_PREFIX, DMU_OBJACCT_PREFIX_LEN + 1); |
| err = zfs_id_to_fuidstr(zfsvfs, NULL, zp->z_projid, buf + offset, |
| sizeof (buf) - offset, B_FALSE); |
| if (err) |
| return (err); |
| |
| if (zfsvfs->z_projectquota_obj == 0) |
| goto objs; |
| |
| err = zap_lookup(zfsvfs->z_os, zfsvfs->z_projectquota_obj, |
| buf + offset, 8, 1, "a); |
| if (err == ENOENT) |
| goto objs; |
| else if (err) |
| return (err); |
| |
| err = zap_lookup(zfsvfs->z_os, DMU_PROJECTUSED_OBJECT, |
| buf + offset, 8, 1, &used); |
| if (unlikely(err == ENOENT)) { |
| uint32_t blksize; |
| u_longlong_t nblocks; |
| |
| /* |
| * Quota accounting is async, so it is possible race case. |
| * There is at least one object with the given project ID. |
| */ |
| sa_object_size(zp->z_sa_hdl, &blksize, &nblocks); |
| if (unlikely(zp->z_blksz == 0)) |
| blksize = zfsvfs->z_max_blksz; |
| |
| used = blksize * nblocks; |
| } else if (err) { |
| return (err); |
| } |
| |
| statp->f_blocks = quota >> bshift; |
| statp->f_bfree = (quota > used) ? ((quota - used) >> bshift) : 0; |
| statp->f_bavail = statp->f_bfree; |
| |
| objs: |
| if (zfsvfs->z_projectobjquota_obj == 0) |
| return (0); |
| |
| err = zap_lookup(zfsvfs->z_os, zfsvfs->z_projectobjquota_obj, |
| buf + offset, 8, 1, "a); |
| if (err == ENOENT) |
| return (0); |
| else if (err) |
| return (err); |
| |
| err = zap_lookup(zfsvfs->z_os, DMU_PROJECTUSED_OBJECT, |
| buf, 8, 1, &used); |
| if (unlikely(err == ENOENT)) { |
| /* |
| * Quota accounting is async, so it is possible race case. |
| * There is at least one object with the given project ID. |
| */ |
| used = 1; |
| } else if (err) { |
| return (err); |
| } |
| |
| statp->f_files = quota; |
| statp->f_ffree = (quota > used) ? (quota - used) : 0; |
| |
| return (0); |
| } |
| |
| int |
| zfs_statvfs(struct inode *ip, struct kstatfs *statp) |
| { |
| zfsvfs_t *zfsvfs = ITOZSB(ip); |
| uint64_t refdbytes, availbytes, usedobjs, availobjs; |
| int err = 0; |
| |
| ZFS_ENTER(zfsvfs); |
| |
| dmu_objset_space(zfsvfs->z_os, |
| &refdbytes, &availbytes, &usedobjs, &availobjs); |
| |
| uint64_t fsid = dmu_objset_fsid_guid(zfsvfs->z_os); |
| /* |
| * The underlying storage pool actually uses multiple block |
| * size. Under Solaris frsize (fragment size) is reported as |
| * the smallest block size we support, and bsize (block size) |
| * as the filesystem's maximum block size. Unfortunately, |
| * under Linux the fragment size and block size are often used |
| * interchangeably. Thus we are forced to report both of them |
| * as the filesystem's maximum block size. |
| */ |
| statp->f_frsize = zfsvfs->z_max_blksz; |
| statp->f_bsize = zfsvfs->z_max_blksz; |
| uint32_t bshift = fls(statp->f_bsize) - 1; |
| |
| /* |
| * The following report "total" blocks of various kinds in |
| * the file system, but reported in terms of f_bsize - the |
| * "preferred" size. |
| */ |
| |
| /* Round up so we never have a filesystem using 0 blocks. */ |
| refdbytes = P2ROUNDUP(refdbytes, statp->f_bsize); |
| statp->f_blocks = (refdbytes + availbytes) >> bshift; |
| statp->f_bfree = availbytes >> bshift; |
| statp->f_bavail = statp->f_bfree; /* no root reservation */ |
| |
| /* |
| * statvfs() should really be called statufs(), because it assumes |
| * static metadata. ZFS doesn't preallocate files, so the best |
| * we can do is report the max that could possibly fit in f_files, |
| * and that minus the number actually used in f_ffree. |
| * For f_ffree, report the smaller of the number of objects available |
| * and the number of blocks (each object will take at least a block). |
| */ |
| statp->f_ffree = MIN(availobjs, availbytes >> DNODE_SHIFT); |
| statp->f_files = statp->f_ffree + usedobjs; |
| statp->f_fsid.val[0] = (uint32_t)fsid; |
| statp->f_fsid.val[1] = (uint32_t)(fsid >> 32); |
| statp->f_type = ZFS_SUPER_MAGIC; |
| statp->f_namelen = MAXNAMELEN - 1; |
| |
| /* |
| * We have all of 40 characters to stuff a string here. |
| * Is there anything useful we could/should provide? |
| */ |
| bzero(statp->f_spare, sizeof (statp->f_spare)); |
| |
| if (dmu_objset_projectquota_enabled(zfsvfs->z_os) && |
| dmu_objset_projectquota_present(zfsvfs->z_os)) { |
| znode_t *zp = ITOZ(ip); |
| |
| if (zp->z_pflags & ZFS_PROJINHERIT && zp->z_projid && |
| zpl_is_valid_projid(zp->z_projid)) |
| err = zfs_statfs_project(zfsvfs, zp, statp, bshift); |
| } |
| |
| ZFS_EXIT(zfsvfs); |
| return (err); |
| } |
| |
| static int |
| zfs_root(zfsvfs_t *zfsvfs, struct inode **ipp) |
| { |
| znode_t *rootzp; |
| int error; |
| |
| ZFS_ENTER(zfsvfs); |
| |
| error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); |
| if (error == 0) |
| *ipp = ZTOI(rootzp); |
| |
| ZFS_EXIT(zfsvfs); |
| return (error); |
| } |
| |
| /* |
| * Linux kernels older than 3.1 do not support a per-filesystem shrinker. |
| * To accommodate this we must improvise and manually walk the list of znodes |
| * attempting to prune dentries in order to be able to drop the inodes. |
| * |
| * To avoid scanning the same znodes multiple times they are always rotated |
| * to the end of the z_all_znodes list. New znodes are inserted at the |
| * end of the list so we're always scanning the oldest znodes first. |
| */ |
| static int |
| zfs_prune_aliases(zfsvfs_t *zfsvfs, unsigned long nr_to_scan) |
| { |
| znode_t **zp_array, *zp; |
| int max_array = MIN(nr_to_scan, PAGE_SIZE * 8 / sizeof (znode_t *)); |
| int objects = 0; |
| int i = 0, j = 0; |
| |
| zp_array = vmem_zalloc(max_array * sizeof (znode_t *), KM_SLEEP); |
| |
| mutex_enter(&zfsvfs->z_znodes_lock); |
| while ((zp = list_head(&zfsvfs->z_all_znodes)) != NULL) { |
| |
| if ((i++ > nr_to_scan) || (j >= max_array)) |
| break; |
| |
| ASSERT(list_link_active(&zp->z_link_node)); |
| list_remove(&zfsvfs->z_all_znodes, zp); |
| list_insert_tail(&zfsvfs->z_all_znodes, zp); |
| |
| /* Skip active znodes and .zfs entries */ |
| if (MUTEX_HELD(&zp->z_lock) || zp->z_is_ctldir) |
| continue; |
| |
| if (igrab(ZTOI(zp)) == NULL) |
| continue; |
| |
| zp_array[j] = zp; |
| j++; |
| } |
| mutex_exit(&zfsvfs->z_znodes_lock); |
| |
| for (i = 0; i < j; i++) { |
| zp = zp_array[i]; |
| |
| ASSERT3P(zp, !=, NULL); |
| d_prune_aliases(ZTOI(zp)); |
| |
| if (atomic_read(&ZTOI(zp)->i_count) == 1) |
| objects++; |
| |
| zrele(zp); |
| } |
| |
| vmem_free(zp_array, max_array * sizeof (znode_t *)); |
| |
| return (objects); |
| } |
| |
| /* |
| * The ARC has requested that the filesystem drop entries from the dentry |
| * and inode caches. This can occur when the ARC needs to free meta data |
| * blocks but can't because they are all pinned by entries in these caches. |
| */ |
| int |
| zfs_prune(struct super_block *sb, unsigned long nr_to_scan, int *objects) |
| { |
| zfsvfs_t *zfsvfs = sb->s_fs_info; |
| int error = 0; |
| struct shrinker *shrinker = &sb->s_shrink; |
| struct shrink_control sc = { |
| .nr_to_scan = nr_to_scan, |
| .gfp_mask = GFP_KERNEL, |
| }; |
| |
| ZFS_ENTER(zfsvfs); |
| |
| #if defined(HAVE_SPLIT_SHRINKER_CALLBACK) && \ |
| defined(SHRINK_CONTROL_HAS_NID) && \ |
| defined(SHRINKER_NUMA_AWARE) |
| if (sb->s_shrink.flags & SHRINKER_NUMA_AWARE) { |
| *objects = 0; |
| for_each_online_node(sc.nid) { |
| *objects += (*shrinker->scan_objects)(shrinker, &sc); |
| /* |
| * reset sc.nr_to_scan, modified by |
| * scan_objects == super_cache_scan |
| */ |
| sc.nr_to_scan = nr_to_scan; |
| } |
| } else { |
| *objects = (*shrinker->scan_objects)(shrinker, &sc); |
| } |
| |
| #elif defined(HAVE_SPLIT_SHRINKER_CALLBACK) |
| *objects = (*shrinker->scan_objects)(shrinker, &sc); |
| #elif defined(HAVE_SINGLE_SHRINKER_CALLBACK) |
| *objects = (*shrinker->shrink)(shrinker, &sc); |
| #elif defined(HAVE_D_PRUNE_ALIASES) |
| #define D_PRUNE_ALIASES_IS_DEFAULT |
| *objects = zfs_prune_aliases(zfsvfs, nr_to_scan); |
| #else |
| #error "No available dentry and inode cache pruning mechanism." |
| #endif |
| |
| #if defined(HAVE_D_PRUNE_ALIASES) && !defined(D_PRUNE_ALIASES_IS_DEFAULT) |
| #undef D_PRUNE_ALIASES_IS_DEFAULT |
| /* |
| * Fall back to zfs_prune_aliases if the kernel's per-superblock |
| * shrinker couldn't free anything, possibly due to the inodes being |
| * allocated in a different memcg. |
| */ |
| if (*objects == 0) |
| *objects = zfs_prune_aliases(zfsvfs, nr_to_scan); |
| #endif |
| |
| ZFS_EXIT(zfsvfs); |
| |
| dprintf_ds(zfsvfs->z_os->os_dsl_dataset, |
| "pruning, nr_to_scan=%lu objects=%d error=%d\n", |
| nr_to_scan, *objects, error); |
| |
| return (error); |
| } |
| |
| /* |
| * Teardown the zfsvfs_t. |
| * |
| * Note, if 'unmounting' is FALSE, we return with the 'z_teardown_lock' |
| * and 'z_teardown_inactive_lock' held. |
| */ |
| static int |
| zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) |
| { |
| znode_t *zp; |
| |
| zfs_unlinked_drain_stop_wait(zfsvfs); |
| |
| /* |
| * If someone has not already unmounted this file system, |
| * drain the zrele_taskq to ensure all active references to the |
| * zfsvfs_t have been handled only then can it be safely destroyed. |
| */ |
| if (zfsvfs->z_os) { |
| /* |
| * If we're unmounting we have to wait for the list to |
| * drain completely. |
| * |
| * If we're not unmounting there's no guarantee the list |
| * will drain completely, but iputs run from the taskq |
| * may add the parents of dir-based xattrs to the taskq |
| * so we want to wait for these. |
| * |
| * We can safely read z_nr_znodes without locking because the |
| * VFS has already blocked operations which add to the |
| * z_all_znodes list and thus increment z_nr_znodes. |
| */ |
| int round = 0; |
| while (zfsvfs->z_nr_znodes > 0) { |
| taskq_wait_outstanding(dsl_pool_zrele_taskq( |
| dmu_objset_pool(zfsvfs->z_os)), 0); |
| if (++round > 1 && !unmounting) |
| break; |
| } |
| } |
| |
| ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, FTAG); |
| |
| if (!unmounting) { |
| /* |
| * We purge the parent filesystem's super block as the |
| * parent filesystem and all of its snapshots have their |
| * inode's super block set to the parent's filesystem's |
| * super block. Note, 'z_parent' is self referential |
| * for non-snapshots. |
| */ |
| shrink_dcache_sb(zfsvfs->z_parent->z_sb); |
| } |
| |
| /* |
| * Close the zil. NB: Can't close the zil while zfs_inactive |
| * threads are blocked as zil_close can call zfs_inactive. |
| */ |
| if (zfsvfs->z_log) { |
| zil_close(zfsvfs->z_log); |
| zfsvfs->z_log = NULL; |
| } |
| |
| rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); |
| |
| /* |
| * If we are not unmounting (ie: online recv) and someone already |
| * unmounted this file system while we were doing the switcheroo, |
| * or a reopen of z_os failed then just bail out now. |
| */ |
| if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { |
| rw_exit(&zfsvfs->z_teardown_inactive_lock); |
| ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); |
| return (SET_ERROR(EIO)); |
| } |
| |
| /* |
| * At this point there are no VFS ops active, and any new VFS ops |
| * will fail with EIO since we have z_teardown_lock for writer (only |
| * relevant for forced unmount). |
| * |
| * Release all holds on dbufs. We also grab an extra reference to all |
| * the remaining inodes so that the kernel does not attempt to free |
| * any inodes of a suspended fs. This can cause deadlocks since the |
| * zfs_resume_fs() process may involve starting threads, which might |
| * attempt to free unreferenced inodes to free up memory for the new |
| * thread. |
| */ |
| if (!unmounting) { |
| mutex_enter(&zfsvfs->z_znodes_lock); |
| for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; |
| zp = list_next(&zfsvfs->z_all_znodes, zp)) { |
| if (zp->z_sa_hdl) |
| zfs_znode_dmu_fini(zp); |
| if (igrab(ZTOI(zp)) != NULL) |
| zp->z_suspended = B_TRUE; |
| |
| } |
| mutex_exit(&zfsvfs->z_znodes_lock); |
| } |
| |
| /* |
| * If we are unmounting, set the unmounted flag and let new VFS ops |
| * unblock. zfs_inactive will have the unmounted behavior, and all |
| * other VFS ops will fail with EIO. |
| */ |
| if (unmounting) { |
| zfsvfs->z_unmounted = B_TRUE; |
| rw_exit(&zfsvfs->z_teardown_inactive_lock); |
| ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); |
| } |
| |
| /* |
| * z_os will be NULL if there was an error in attempting to reopen |
| * zfsvfs, so just return as the properties had already been |
| * |
| * unregistered and cached data had been evicted before. |
| */ |
| if (zfsvfs->z_os == NULL) |
| return (0); |
| |
| /* |
| * Unregister properties. |
| */ |
| zfs_unregister_callbacks(zfsvfs); |
| |
| /* |
| * Evict cached data. We must write out any dirty data before |
| * disowning the dataset. |
| */ |
| objset_t *os = zfsvfs->z_os; |
| boolean_t os_dirty = B_FALSE; |
| for (int t = 0; t < TXG_SIZE; t++) { |
| if (dmu_objset_is_dirty(os, t)) { |
| os_dirty = B_TRUE; |
| break; |
| } |
| } |
| if (!zfs_is_readonly(zfsvfs) && os_dirty) { |
| txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); |
| } |
| dmu_objset_evict_dbufs(zfsvfs->z_os); |
| dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; |
| dsl_dir_cancel_waiters(dd); |
| |
| return (0); |
| } |
| |
| #if defined(HAVE_SUPER_SETUP_BDI_NAME) |
| atomic_long_t zfs_bdi_seq = ATOMIC_LONG_INIT(0); |
| #endif |
| |
| int |
| zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent) |
| { |
| const char *osname = zm->mnt_osname; |
| struct inode *root_inode = NULL; |
| uint64_t recordsize; |
| int error = 0; |
| zfsvfs_t *zfsvfs = NULL; |
| vfs_t *vfs = NULL; |
| |
| ASSERT(zm); |
| ASSERT(osname); |
| |
| error = zfsvfs_parse_options(zm->mnt_data, &vfs); |
| if (error) |
| return (error); |
| |
| error = zfsvfs_create(osname, vfs->vfs_readonly, &zfsvfs); |
| if (error) { |
| zfsvfs_vfs_free(vfs); |
| goto out; |
| } |
| |
| if ((error = dsl_prop_get_integer(osname, "recordsize", |
| &recordsize, NULL))) { |
| zfsvfs_vfs_free(vfs); |
| goto out; |
| } |
| |
| vfs->vfs_data = zfsvfs; |
| zfsvfs->z_vfs = vfs; |
| zfsvfs->z_sb = sb; |
| sb->s_fs_info = zfsvfs; |
| sb->s_magic = ZFS_SUPER_MAGIC; |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| sb->s_time_gran = 1; |
| sb->s_blocksize = recordsize; |
| sb->s_blocksize_bits = ilog2(recordsize); |
| |
| error = -zpl_bdi_setup(sb, "zfs"); |
| if (error) |
| goto out; |
| |
| sb->s_bdi->ra_pages = 0; |
| |
| /* Set callback operations for the file system. */ |
| sb->s_op = &zpl_super_operations; |
| sb->s_xattr = zpl_xattr_handlers; |
| sb->s_export_op = &zpl_export_operations; |
| |
| /* Set features for file system. */ |
| zfs_set_fuid_feature(zfsvfs); |
| |
| if (dmu_objset_is_snapshot(zfsvfs->z_os)) { |
| uint64_t pval; |
| |
| atime_changed_cb(zfsvfs, B_FALSE); |
| readonly_changed_cb(zfsvfs, B_TRUE); |
| if ((error = dsl_prop_get_integer(osname, |
| "xattr", &pval, NULL))) |
| goto out; |
| xattr_changed_cb(zfsvfs, pval); |
| if ((error = dsl_prop_get_integer(osname, |
| "acltype", &pval, NULL))) |
| goto out; |
| acltype_changed_cb(zfsvfs, pval); |
| zfsvfs->z_issnap = B_TRUE; |
| zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; |
| zfsvfs->z_snap_defer_time = jiffies; |
| |
| mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); |
| dmu_objset_set_user(zfsvfs->z_os, zfsvfs); |
| mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); |
| } else { |
| if ((error = zfsvfs_setup(zfsvfs, B_TRUE))) |
| goto out; |
| } |
| |
| /* Allocate a root inode for the filesystem. */ |
| error = zfs_root(zfsvfs, &root_inode); |
| if (error) { |
| (void) zfs_umount(sb); |
| zfsvfs = NULL; /* avoid double-free; first in zfs_umount */ |
| goto out; |
| } |
| |
| /* Allocate a root dentry for the filesystem */ |
| sb->s_root = d_make_root(root_inode); |
| if (sb->s_root == NULL) { |
| (void) zfs_umount(sb); |
| zfsvfs = NULL; /* avoid double-free; first in zfs_umount */ |
| error = SET_ERROR(ENOMEM); |
| goto out; |
| } |
| |
| if (!zfsvfs->z_issnap) |
| zfsctl_create(zfsvfs); |
| |
| zfsvfs->z_arc_prune = arc_add_prune_callback(zpl_prune_sb, sb); |
| out: |
| if (error) { |
| if (zfsvfs != NULL) { |
| dmu_objset_disown(zfsvfs->z_os, B_TRUE, zfsvfs); |
| zfsvfs_free(zfsvfs); |
| } |
| /* |
| * make sure we don't have dangling sb->s_fs_info which |
| * zfs_preumount will use. |
| */ |
| sb->s_fs_info = NULL; |
| } |
| |
| return (error); |
| } |
| |
| /* |
| * Called when an unmount is requested and certain sanity checks have |
| * already passed. At this point no dentries or inodes have been reclaimed |
| * from their respective caches. We drop the extra reference on the .zfs |
| * control directory to allow everything to be reclaimed. All snapshots |
| * must already have been unmounted to reach this point. |
| */ |
| void |
| zfs_preumount(struct super_block *sb) |
| { |
| zfsvfs_t *zfsvfs = sb->s_fs_info; |
| |
| /* zfsvfs is NULL when zfs_domount fails during mount */ |
| if (zfsvfs) { |
| zfs_unlinked_drain_stop_wait(zfsvfs); |
| zfsctl_destroy(sb->s_fs_info); |
| /* |
| * Wait for zrele_async before entering evict_inodes in |
| * generic_shutdown_super. The reason we must finish before |
| * evict_inodes is when lazytime is on, or when zfs_purgedir |
| * calls zfs_zget, zrele would bump i_count from 0 to 1. This |
| * would race with the i_count check in evict_inodes. This means |
| * it could destroy the inode while we are still using it. |
| * |
| * We wait for two passes. xattr directories in the first pass |
| * may add xattr entries in zfs_purgedir, so in the second pass |
| * we wait for them. We don't use taskq_wait here because it is |
| * a pool wide taskq. Other mounted filesystems can constantly |
| * do zrele_async and there's no guarantee when taskq will be |
| * empty. |
| */ |
| taskq_wait_outstanding(dsl_pool_zrele_taskq( |
| dmu_objset_pool(zfsvfs->z_os)), 0); |
| taskq_wait_outstanding(dsl_pool_zrele_taskq( |
| dmu_objset_pool(zfsvfs->z_os)), 0); |
| } |
| } |
| |
| /* |
| * Called once all other unmount released tear down has occurred. |
| * It is our responsibility to release any remaining infrastructure. |
| */ |
| /*ARGSUSED*/ |
| int |
| zfs_umount(struct super_block *sb) |
| { |
| zfsvfs_t *zfsvfs = sb->s_fs_info; |
| objset_t *os; |
| |
| if (zfsvfs->z_arc_prune != NULL) |
| arc_remove_prune_callback(zfsvfs->z_arc_prune); |
| VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); |
| os = zfsvfs->z_os; |
| zpl_bdi_destroy(sb); |
| |
| /* |
| * z_os will be NULL if there was an error in |
| * attempting to reopen zfsvfs. |
| */ |
| if (os != NULL) { |
| /* |
| * Unset the objset user_ptr. |
| */ |
| mutex_enter(&os->os_user_ptr_lock); |
| dmu_objset_set_user(os, NULL); |
| mutex_exit(&os->os_user_ptr_lock); |
| |
| /* |
| * Finally release the objset |
| */ |
| dmu_objset_disown(os, B_TRUE, zfsvfs); |
| } |
| |
| zfsvfs_free(zfsvfs); |
| return (0); |
| } |
| |
| int |
| zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm) |
| { |
| zfsvfs_t *zfsvfs = sb->s_fs_info; |
| vfs_t *vfsp; |
| boolean_t issnap = dmu_objset_is_snapshot(zfsvfs->z_os); |
| int error; |
| |
| if ((issnap || !spa_writeable(dmu_objset_spa(zfsvfs->z_os))) && |
| !(*flags & SB_RDONLY)) { |
| *flags |= SB_RDONLY; |
| return (EROFS); |
| } |
| |
| error = zfsvfs_parse_options(zm->mnt_data, &vfsp); |
| if (error) |
| return (error); |
| |
| if (!zfs_is_readonly(zfsvfs) && (*flags & SB_RDONLY)) |
| txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); |
| |
| zfs_unregister_callbacks(zfsvfs); |
| zfsvfs_vfs_free(zfsvfs->z_vfs); |
| |
| vfsp->vfs_data = zfsvfs; |
| zfsvfs->z_vfs = vfsp; |
| if (!issnap) |
| (void) zfs_register_callbacks(vfsp); |
| |
| return (error); |
| } |
| |
| int |
| zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp) |
| { |
| zfsvfs_t *zfsvfs = sb->s_fs_info; |
| znode_t *zp; |
| uint64_t object = 0; |
| uint64_t fid_gen = 0; |
| uint64_t gen_mask; |
| uint64_t zp_gen; |
| int i, err; |
| |
| *ipp = NULL; |
| |
| if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { |
| zfid_short_t *zfid = (zfid_short_t *)fidp; |
| |
| for (i = 0; i < sizeof (zfid->zf_object); i++) |
| object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); |
| |
| for (i = 0; i < sizeof (zfid->zf_gen); i++) |
| fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); |
| } else { |
| return (SET_ERROR(EINVAL)); |
| } |
| |
| /* LONG_FID_LEN means snapdirs */ |
| if (fidp->fid_len == LONG_FID_LEN) { |
| zfid_long_t *zlfid = (zfid_long_t *)fidp; |
| uint64_t objsetid = 0; |
| uint64_t setgen = 0; |
| |
| for (i = 0; i < sizeof (zlfid->zf_setid); i++) |
| objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); |
| |
| for (i = 0; i < sizeof (zlfid->zf_setgen); i++) |
| setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); |
| |
| if (objsetid != ZFSCTL_INO_SNAPDIRS - object) { |
| dprintf("snapdir fid: objsetid (%llu) != " |
| "ZFSCTL_INO_SNAPDIRS (%llu) - object (%llu)\n", |
| objsetid, ZFSCTL_INO_SNAPDIRS, object); |
| |
| return (SET_ERROR(EINVAL)); |
| } |
| |
| if (fid_gen > 1 || setgen != 0) { |
| dprintf("snapdir fid: fid_gen (%llu) and setgen " |
| "(%llu)\n", fid_gen, setgen); |
| return (SET_ERROR(EINVAL)); |
| } |
| |
| return (zfsctl_snapdir_vget(sb, objsetid, fid_gen, ipp)); |
| } |
| |
| ZFS_ENTER(zfsvfs); |
| /* A zero fid_gen means we are in the .zfs control directories */ |
| if (fid_gen == 0 && |
| (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) { |
| *ipp = zfsvfs->z_ctldir; |
| ASSERT(*ipp != NULL); |
| if (object == ZFSCTL_INO_SNAPDIR) { |
| VERIFY(zfsctl_root_lookup(*ipp, "snapshot", ipp, |
| 0, kcred, NULL, NULL) == 0); |
| } else { |
| /* |
| * Must have an existing ref, so igrab() |
| * cannot return NULL |
| */ |
| VERIFY3P(igrab(*ipp), !=, NULL); |
| } |
| ZFS_EXIT(zfsvfs); |
| return (0); |
| } |
| |
| gen_mask = -1ULL >> (64 - 8 * i); |
| |
| dprintf("getting %llu [%llu mask %llx]\n", object, fid_gen, gen_mask); |
| if ((err = zfs_zget(zfsvfs, object, &zp))) { |
| ZFS_EXIT(zfsvfs); |
| return (err); |
| } |
| |
| /* Don't export xattr stuff */ |
| if (zp->z_pflags & ZFS_XATTR) { |
| zrele(zp); |
| ZFS_EXIT(zfsvfs); |
| return (SET_ERROR(ENOENT)); |
| } |
| |
| (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, |
| sizeof (uint64_t)); |
| zp_gen = zp_gen & gen_mask; |
| if (zp_gen == 0) |
| zp_gen = 1; |
| if ((fid_gen == 0) && (zfsvfs->z_root == object)) |
| fid_gen = zp_gen; |
| if (zp->z_unlinked || zp_gen != fid_gen) { |
| dprintf("znode gen (%llu) != fid gen (%llu)\n", zp_gen, |
| fid_gen); |
| zrele(zp); |
| ZFS_EXIT(zfsvfs); |
| return (SET_ERROR(ENOENT)); |
| } |
| |
| *ipp = ZTOI(zp); |
| if (*ipp) |
| zfs_znode_update_vfs(ITOZ(*ipp)); |
| |
| ZFS_EXIT(zfsvfs); |
| return (0); |
| } |
| |
| /* |
| * Block out VFS ops and close zfsvfs_t |
| * |
| * Note, if successful, then we return with the 'z_teardown_lock' and |
| * 'z_teardown_inactive_lock' write held. We leave ownership of the underlying |
| * dataset and objset intact so that they can be atomically handed off during |
| * a subsequent rollback or recv operation and the resume thereafter. |
| */ |
| int |
| zfs_suspend_fs(zfsvfs_t *zfsvfs) |
| { |
| int error; |
| |
| if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) |
| return (error); |
| |
| return (0); |
| } |
| |
| /* |
| * Rebuild SA and release VOPs. Note that ownership of the underlying dataset |
| * is an invariant across any of the operations that can be performed while the |
| * filesystem was suspended. Whether it succeeded or failed, the preconditions |
| * are the same: the relevant objset and associated dataset are owned by |
| * zfsvfs, held, and long held on entry. |
| */ |
| int |
| zfs_resume_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds) |
| { |
| int err, err2; |
| znode_t *zp; |
| |
| ASSERT(ZFS_TEARDOWN_WRITE_HELD(zfsvfs)); |
| ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); |
| |
| /* |
| * We already own this, so just update the objset_t, as the one we |
| * had before may have been evicted. |
| */ |
| objset_t *os; |
| VERIFY3P(ds->ds_owner, ==, zfsvfs); |
| VERIFY(dsl_dataset_long_held(ds)); |
| dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds)); |
| dsl_pool_config_enter(dp, FTAG); |
| VERIFY0(dmu_objset_from_ds(ds, &os)); |
| dsl_pool_config_exit(dp, FTAG); |
| |
| err = zfsvfs_init(zfsvfs, os); |
| if (err != 0) |
| goto bail; |
| |
| ds->ds_dir->dd_activity_cancelled = B_FALSE; |
| VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); |
| |
| zfs_set_fuid_feature(zfsvfs); |
| zfsvfs->z_rollback_time = jiffies; |
| |
| /* |
| * Attempt to re-establish all the active inodes with their |
| * dbufs. If a zfs_rezget() fails, then we unhash the inode |
| * and mark it stale. This prevents a collision if a new |
| * inode/object is created which must use the same inode |
| * number. The stale inode will be be released when the |
| * VFS prunes the dentry holding the remaining references |
| * on the stale inode. |
| */ |
| mutex_enter(&zfsvfs->z_znodes_lock); |
| for (zp = list_head(&zfsvfs->z_all_znodes); zp; |
| zp = list_next(&zfsvfs->z_all_znodes, zp)) { |
| err2 = zfs_rezget(zp); |
| if (err2) { |
| zpl_d_drop_aliases(ZTOI(zp)); |
| remove_inode_hash(ZTOI(zp)); |
| } |
| |
| /* see comment in zfs_suspend_fs() */ |
| if (zp->z_suspended) { |
| zfs_zrele_async(zp); |
| zp->z_suspended = B_FALSE; |
| } |
| } |
| mutex_exit(&zfsvfs->z_znodes_lock); |
| |
| if (!zfs_is_readonly(zfsvfs) && !zfsvfs->z_unmounted) { |
| /* |
| * zfs_suspend_fs() could have interrupted freeing |
| * of dnodes. We need to restart this freeing so |
| * that we don't "leak" the space. |
| */ |
| zfs_unlinked_drain(zfsvfs); |
| } |
| |
| /* |
| * Most of the time zfs_suspend_fs is used for changing the contents |
| * of the underlying dataset. ZFS rollback and receive operations |
| * might create files for which negative dentries are present in |
| * the cache. Since walking the dcache would require a lot of GPL-only |
| * code duplication, it's much easier on these rather rare occasions |
| * just to flush the whole dcache for the given dataset/filesystem. |
| */ |
| shrink_dcache_sb(zfsvfs->z_sb); |
| |
| bail: |
| if (err != 0) |
| zfsvfs->z_unmounted = B_TRUE; |
| |
| /* release the VFS ops */ |
| rw_exit(&zfsvfs->z_teardown_inactive_lock); |
| ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); |
| |
| if (err != 0) { |
| /* |
| * Since we couldn't setup the sa framework, try to force |
| * unmount this file system. |
| */ |
| if (zfsvfs->z_os) |
| (void) zfs_umount(zfsvfs->z_sb); |
| } |
| return (err); |
| } |
| |
| /* |
| * Release VOPs and unmount a suspended filesystem. |
| */ |
| int |
| zfs_end_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds) |
| { |
| ASSERT(ZFS_TEARDOWN_WRITE_HELD(zfsvfs)); |
| ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); |
| |
| /* |
| * We already own this, so just hold and rele it to update the |
| * objset_t, as the one we had before may have been evicted. |
| */ |
| objset_t *os; |
| VERIFY3P(ds->ds_owner, ==, zfsvfs); |
| VERIFY(dsl_dataset_long_held(ds)); |
| dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds)); |
| dsl_pool_config_enter(dp, FTAG); |
| VERIFY0(dmu_objset_from_ds(ds, &os)); |
| dsl_pool_config_exit(dp, FTAG); |
| zfsvfs->z_os = os; |
| |
| /* release the VOPs */ |
| rw_exit(&zfsvfs->z_teardown_inactive_lock); |
| ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); |
| |
| /* |
| * Try to force unmount this file system. |
| */ |
| (void) zfs_umount(zfsvfs->z_sb); |
| zfsvfs->z_unmounted = B_TRUE; |
| return (0); |
| } |
| |
| /* |
| * Automounted snapshots rely on periodic revalidation |
| * to defer snapshots from being automatically unmounted. |
| */ |
| |
| inline void |
| zfs_exit_fs(zfsvfs_t *zfsvfs) |
| { |
| if (!zfsvfs->z_issnap) |
| return; |
| |
| if (time_after(jiffies, zfsvfs->z_snap_defer_time + |
| MAX(zfs_expire_snapshot * HZ / 2, HZ))) { |
| zfsvfs->z_snap_defer_time = jiffies; |
| zfsctl_snapshot_unmount_delay(zfsvfs->z_os->os_spa, |
| dmu_objset_id(zfsvfs->z_os), |
| zfs_expire_snapshot); |
| } |
| } |
| |
| int |
| zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) |
| { |
| int error; |
| objset_t *os = zfsvfs->z_os; |
| dmu_tx_t *tx; |
| |
| if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) |
| return (SET_ERROR(EINVAL)); |
| |
| if (newvers < zfsvfs->z_version) |
| return (SET_ERROR(EINVAL)); |
| |
| if (zfs_spa_version_map(newvers) > |
| spa_version(dmu_objset_spa(zfsvfs->z_os))) |
| return (SET_ERROR(ENOTSUP)); |
| |
| tx = dmu_tx_create(os); |
| dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); |
| if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { |
| dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, |
| ZFS_SA_ATTRS); |
| dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); |
| } |
| error = dmu_tx_assign(tx, TXG_WAIT); |
| if (error) { |
| dmu_tx_abort(tx); |
| return (error); |
| } |
| |
| error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, |
| 8, 1, &newvers, tx); |
| |
| if (error) { |
| dmu_tx_commit(tx); |
| return (error); |
| } |
| |
| if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { |
| uint64_t sa_obj; |
| |
| ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, |
| SPA_VERSION_SA); |
| sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, |
| DMU_OT_NONE, 0, tx); |
| |
| error = zap_add(os, MASTER_NODE_OBJ, |
| ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); |
| ASSERT0(error); |
| |
| VERIFY(0 == sa_set_sa_object(os, sa_obj)); |
| sa_register_update_callback(os, zfs_sa_upgrade); |
| } |
| |
| spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, |
| "from %llu to %llu", zfsvfs->z_version, newvers); |
| |
| dmu_tx_commit(tx); |
| |
| zfsvfs->z_version = newvers; |
| os->os_version = newvers; |
| |
| zfs_set_fuid_feature(zfsvfs); |
| |
| return (0); |
| } |
| |
| /* |
| * Read a property stored within the master node. |
| */ |
| int |
| zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) |
| { |
| uint64_t *cached_copy = NULL; |
| |
| /* |
| * Figure out where in the objset_t the cached copy would live, if it |
| * is available for the requested property. |
| */ |
| if (os != NULL) { |
| switch (prop) { |
| case ZFS_PROP_VERSION: |
| cached_copy = &os->os_version; |
| break; |
| case ZFS_PROP_NORMALIZE: |
| cached_copy = &os->os_normalization; |
| break; |
| case ZFS_PROP_UTF8ONLY: |
| cached_copy = &os->os_utf8only; |
| break; |
| case ZFS_PROP_CASE: |
| cached_copy = &os->os_casesensitivity; |
| break; |
| default: |
| break; |
| } |
| } |
| if (cached_copy != NULL && *cached_copy != OBJSET_PROP_UNINITIALIZED) { |
| *value = *cached_copy; |
| return (0); |
| } |
| |
| /* |
| * If the property wasn't cached, look up the file system's value for |
| * the property. For the version property, we look up a slightly |
| * different string. |
| */ |
| const char *pname; |
| int error = ENOENT; |
| if (prop == ZFS_PROP_VERSION) |
| pname = ZPL_VERSION_STR; |
| else |
| pname = zfs_prop_to_name(prop); |
| |
| if (os != NULL) { |
| ASSERT3U(os->os_phys->os_type, ==, DMU_OST_ZFS); |
| error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); |
| } |
| |
| if (error == ENOENT) { |
| /* No value set, use the default value */ |
| switch (prop) { |
| case ZFS_PROP_VERSION: |
| *value = ZPL_VERSION; |
| break; |
| case ZFS_PROP_NORMALIZE: |
| case ZFS_PROP_UTF8ONLY: |
| *value = 0; |
| break; |
| case ZFS_PROP_CASE: |
| *value = ZFS_CASE_SENSITIVE; |
| break; |
| case ZFS_PROP_ACLTYPE: |
| *value = ZFS_ACLTYPE_OFF; |
| break; |
| default: |
| return (error); |
| } |
| error = 0; |
| } |
| |
| /* |
| * If one of the methods for getting the property value above worked, |
| * copy it into the objset_t's cache. |
| */ |
| if (error == 0 && cached_copy != NULL) { |
| *cached_copy = *value; |
| } |
| |
| return (error); |
| } |
| |
| /* |
| * Return true if the corresponding vfs's unmounted flag is set. |
| * Otherwise return false. |
| * If this function returns true we know VFS unmount has been initiated. |
| */ |
| boolean_t |
| zfs_get_vfs_flag_unmounted(objset_t *os) |
| { |
| zfsvfs_t *zfvp; |
| boolean_t unmounted = B_FALSE; |
| |
| ASSERT(dmu_objset_type(os) == DMU_OST_ZFS); |
| |
| mutex_enter(&os->os_user_ptr_lock); |
| zfvp = dmu_objset_get_user(os); |
| if (zfvp != NULL && zfvp->z_unmounted) |
| unmounted = B_TRUE; |
| mutex_exit(&os->os_user_ptr_lock); |
| |
| return (unmounted); |
| } |
| |
| /*ARGSUSED*/ |
| void |
| zfsvfs_update_fromname(const char *oldname, const char *newname) |
| { |
| /* |
| * We don't need to do anything here, the devname is always current by |
| * virtue of zfsvfs->z_sb->s_op->show_devname. |
| */ |
| } |
| |
| void |
| zfs_init(void) |
| { |
| zfsctl_init(); |
| zfs_znode_init(); |
| dmu_objset_register_type(DMU_OST_ZFS, zpl_get_file_info); |
| register_filesystem(&zpl_fs_type); |
| } |
| |
| void |
| zfs_fini(void) |
| { |
| /* |
| * we don't use outstanding because zpl_posix_acl_free might add more. |
| */ |
| taskq_wait(system_delay_taskq); |
| taskq_wait(system_taskq); |
| unregister_filesystem(&zpl_fs_type); |
| zfs_znode_fini(); |
| zfsctl_fini(); |
| } |
| |
| #if defined(_KERNEL) |
| EXPORT_SYMBOL(zfs_suspend_fs); |
| EXPORT_SYMBOL(zfs_resume_fs); |
| EXPORT_SYMBOL(zfs_set_version); |
| EXPORT_SYMBOL(zfsvfs_create); |
| EXPORT_SYMBOL(zfsvfs_free); |
| EXPORT_SYMBOL(zfs_is_readonly); |
| EXPORT_SYMBOL(zfs_domount); |
| EXPORT_SYMBOL(zfs_preumount); |
| EXPORT_SYMBOL(zfs_umount); |
| EXPORT_SYMBOL(zfs_remount); |
| EXPORT_SYMBOL(zfs_statvfs); |
| EXPORT_SYMBOL(zfs_vget); |
| EXPORT_SYMBOL(zfs_prune); |
| #endif |