FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/os/freebsd/zfs/kmod_core.c

     /*
      * Copyright (c) 2020 iXsystems, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/buf.h>
    #include <sys/cmn_err.h>
    #include <sys/conf.h>
    #include <sys/dmu.h>
    #include <sys/dmu_impl.h>
    #include <sys/dmu_objset.h>
    #include <sys/dmu_send.h>
    #include <sys/dmu_tx.h>
    #include <sys/dsl_bookmark.h>
    #include <sys/dsl_crypt.h>
    #include <sys/dsl_dataset.h>
    #include <sys/dsl_deleg.h>
    #include <sys/dsl_destroy.h>
    #include <sys/dsl_dir.h>
    #include <sys/dsl_prop.h>
    #include <sys/dsl_scan.h>
    #include <sys/dsl_userhold.h>
    #include <sys/errno.h>
    #include <sys/eventhandler.h>
    #include <sys/file.h>
    #include <sys/fm/util.h>
    #include <sys/fs/zfs.h>
    #include <sys/kernel.h>
    #include <sys/kmem.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mount.h>
    #include <sys/mutex.h>
    #include <sys/nvpair.h>
    #include <sys/policy.h>
    #include <sys/proc.h>
    #include <sys/sdt.h>
    #include <sys/spa.h>
    #include <sys/spa_impl.h>
    #include <sys/stat.h>
    #include <sys/sunddi.h>
    #include <sys/systm.h>
    #include <sys/taskqueue.h>
    #include <sys/uio.h>
    #include <sys/vdev.h>
    #include <sys/vdev_removal.h>
    #include <sys/zap.h>
    #include <sys/zcp.h>
    #include <sys/zfeature.h>
    #include <sys/zfs_context.h>
    #include <sys/zfs_ctldir.h>
    #include <sys/zfs_dir.h>
    #include <sys/zfs_ioctl.h>
    #include <sys/zfs_ioctl_compat.h>
    #include <sys/zfs_ioctl_impl.h>
    #include <sys/zfs_onexit.h>
    #include <sys/zfs_vfsops.h>
    #include <sys/zfs_znode.h>
    #include <sys/zio_checksum.h>
    #include <sys/zone.h>
    #include <sys/zvol.h>
    
    #include "zfs_comutil.h"
    #include "zfs_deleg.h"
    #include "zfs_namecheck.h"
    #include "zfs_prop.h"
    
    SYSCTL_DECL(_vfs_zfs);
    SYSCTL_DECL(_vfs_zfs_vdev);
    
    extern uint_t rrw_tsd_key;
    static int zfs_version_ioctl = ZFS_IOCVER_OZFS;
    SYSCTL_DECL(_vfs_zfs_version);
   SYSCTL_INT(_vfs_zfs_version, OID_AUTO, ioctl, CTLFLAG_RD, &zfs_version_ioctl,
       0, "ZFS_IOCTL_VERSION");
   
   static struct cdev *zfsdev;
   
   static struct root_hold_token *zfs_root_token;
   
   extern uint_t rrw_tsd_key;
   extern uint_t zfs_allow_log_key;
   extern uint_t zfs_geom_probe_vdev_key;
   
   static int zfs__init(void);
   static int zfs__fini(void);
   static void zfs_shutdown(void *, int);
   
   static eventhandler_tag zfs_shutdown_event_tag;
   
   #define ZFS_MIN_KSTACK_PAGES 4
   
   static int
   zfsdev_ioctl(struct cdev *dev, ulong_t zcmd, caddr_t arg, int flag,
       struct thread *td)
   {
           uint_t len;
           int vecnum;
           zfs_iocparm_t *zp;
           zfs_cmd_t *zc;
   #ifdef ZFS_LEGACY_SUPPORT
           zfs_cmd_legacy_t *zcl;
   #endif
           int rc, error;
           void *uaddr;
   
           len = IOCPARM_LEN(zcmd);
           vecnum = zcmd & 0xff;
           zp = (void *)arg;
           error = 0;
   #ifdef ZFS_LEGACY_SUPPORT
           zcl = NULL;
   #endif
   
           if (len != sizeof (zfs_iocparm_t))
                   return (EINVAL);
   
           uaddr = (void *)(uintptr_t)zp->zfs_cmd;
           zc = kmem_zalloc(sizeof (zfs_cmd_t), KM_SLEEP);
   #ifdef ZFS_LEGACY_SUPPORT
           /*
            * Remap ioctl code for legacy user binaries
            */
           if (zp->zfs_ioctl_version == ZFS_IOCVER_LEGACY) {
                   vecnum = zfs_ioctl_legacy_to_ozfs(vecnum);
                   if (vecnum < 0) {
                           kmem_free(zc, sizeof (zfs_cmd_t));
                           return (ENOTSUP);
                   }
                   zcl = kmem_zalloc(sizeof (zfs_cmd_legacy_t), KM_SLEEP);
                   if (copyin(uaddr, zcl, sizeof (zfs_cmd_legacy_t))) {
                           error = SET_ERROR(EFAULT);
                           goto out;
                   }
                   zfs_cmd_legacy_to_ozfs(zcl, zc);
           } else
   #endif
           if (copyin(uaddr, zc, sizeof (zfs_cmd_t))) {
                   error = SET_ERROR(EFAULT);
                   goto out;
           }
           error = zfsdev_ioctl_common(vecnum, zc, 0);
   #ifdef ZFS_LEGACY_SUPPORT
           if (zcl) {
                   zfs_cmd_ozfs_to_legacy(zc, zcl);
                   rc = copyout(zcl, uaddr, sizeof (*zcl));
           } else
   #endif
           {
                   rc = copyout(zc, uaddr, sizeof (*zc));
           }
           if (error == 0 && rc != 0)
                   error = SET_ERROR(EFAULT);
   out:
   #ifdef ZFS_LEGACY_SUPPORT
           if (zcl)
                   kmem_free(zcl, sizeof (zfs_cmd_legacy_t));
   #endif
           kmem_free(zc, sizeof (zfs_cmd_t));
           MPASS(tsd_get(rrw_tsd_key) == NULL);
           return (error);
   }
   
   static void
   zfsdev_close(void *data)
   {
           zfsdev_state_destroy(data);
   }
   
   void
   zfsdev_private_set_state(void *priv __unused, zfsdev_state_t *zs)
   {
           devfs_set_cdevpriv(zs, zfsdev_close);
   }
   
   zfsdev_state_t *
   zfsdev_private_get_state(void *priv)
   {
           return (priv);
   }
   
   static int
   zfsdev_open(struct cdev *devp __unused, int flag __unused, int mode __unused,
       struct thread *td __unused)
   {
           int error;
   
           mutex_enter(&zfsdev_state_lock);
           error = zfsdev_state_init(NULL);
           mutex_exit(&zfsdev_state_lock);
   
           return (error);
   }
   
   static struct cdevsw zfs_cdevsw = {
           .d_version =    D_VERSION,
           .d_open =       zfsdev_open,
           .d_ioctl =      zfsdev_ioctl,
           .d_name =       ZFS_DRIVER
   };
   
   int
   zfsdev_attach(void)
   {
           struct make_dev_args args;
   
           make_dev_args_init(&args);
           args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
           args.mda_devsw = &zfs_cdevsw;
           args.mda_cr = NULL;
           args.mda_uid = UID_ROOT;
           args.mda_gid = GID_OPERATOR;
           args.mda_mode = 0666;
           return (make_dev_s(&args, &zfsdev, ZFS_DRIVER));
   }
   
   void
   zfsdev_detach(void)
   {
           if (zfsdev != NULL)
                   destroy_dev(zfsdev);
   }
   
   int
   zfs__init(void)
   {
           int error;
   
   #if KSTACK_PAGES < ZFS_MIN_KSTACK_PAGES
           printf("ZFS NOTICE: KSTACK_PAGES is %d which could result in stack "
               "overflow panic!\nPlease consider adding "
               "'options KSTACK_PAGES=%d' to your kernel config\n", KSTACK_PAGES,
               ZFS_MIN_KSTACK_PAGES);
   #endif
           zfs_root_token = root_mount_hold("ZFS");
           if ((error = zfs_kmod_init()) != 0) {
                   printf("ZFS: Failed to Load ZFS Filesystem"
                       ", rc = %d\n", error);
                   root_mount_rel(zfs_root_token);
                   return (error);
           }
   
   
           tsd_create(&zfs_geom_probe_vdev_key, NULL);
   
           printf("ZFS storage pool version: features support ("
               SPA_VERSION_STRING ")\n");
           root_mount_rel(zfs_root_token);
           ddi_sysevent_init();
           return (0);
   }
   
   int
   zfs__fini(void)
   {
           if (zfs_busy() || zvol_busy() ||
               zio_injection_enabled) {
                   return (EBUSY);
           }
           zfs_kmod_fini();
           tsd_destroy(&zfs_geom_probe_vdev_key);
           return (0);
   }
   
   static void
   zfs_shutdown(void *arg __unused, int howto __unused)
   {
   
           /*
            * ZFS fini routines can not properly work in a panic-ed system.
            */
           if (panicstr == NULL)
                   zfs__fini();
   }
   
   static int
   zfs_modevent(module_t mod, int type, void *unused __unused)
   {
           int err;
   
           switch (type) {
           case MOD_LOAD:
                   err = zfs__init();
                   if (err == 0)
                           zfs_shutdown_event_tag = EVENTHANDLER_REGISTER(
                               shutdown_post_sync, zfs_shutdown, NULL,
                               SHUTDOWN_PRI_FIRST);
                   return (err);
           case MOD_UNLOAD:
                   err = zfs__fini();
                   if (err == 0 && zfs_shutdown_event_tag != NULL)
                           EVENTHANDLER_DEREGISTER(shutdown_post_sync,
                               zfs_shutdown_event_tag);
                   return (err);
           case MOD_SHUTDOWN:
                   return (0);
           default:
                   break;
           }
           return (EOPNOTSUPP);
   }
   
   static moduledata_t zfs_mod = {
           "zfsctrl",
           zfs_modevent,
           0
   };
   
   #ifdef _KERNEL
   EVENTHANDLER_DEFINE(mountroot, spa_boot_init, NULL, 0);
   #endif
   
   DECLARE_MODULE(zfsctrl, zfs_mod, SI_SUB_CLOCKS, SI_ORDER_ANY);
   MODULE_VERSION(zfsctrl, 1);
   #if __FreeBSD_version > 1300092
   MODULE_DEPEND(zfsctrl, xdr, 1, 1, 1);
   #else
   MODULE_DEPEND(zfsctrl, krpc, 1, 1, 1);
   #endif
   MODULE_DEPEND(zfsctrl, acl_nfs4, 1, 1, 1);
   MODULE_DEPEND(zfsctrl, crypto, 1, 1, 1);
   MODULE_DEPEND(zfsctrl, zlib, 1, 1, 1);

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