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freebsd-dev/include/libzfs_impl.h
Brian Behlendorf ba6a24026c Remove ZFC_IOC_*_MINOR ioctl()s 
Early versions of ZFS coordinated the creation and destruction
of device minors from userspace.  This was inherently racy and
in late 2009 these ioctl()s were removed leaving everything up
to the kernel.  This significantly simplified the code.

However, we never picked up these changes in ZoL since we'd
already significantly adjusted this code for Linux.  This patch
aims to rectify that by finally removing ZFC_IOC_*_MINOR ioctl()s
and moving all the functionality down in to the kernel.  Since
this cleanup will change the kernel/user ABI it's being done
in the same tag as the previous libzfs_core ABI changes.  This
will minimize, but not eliminate, the disruption to end users.

Once merged ZoL, Illumos, and FreeBSD will basically be back
in sync in regards to handling ZVOLs in the common code.  While
each platform must have its own custom zvol.c implemenation the
interfaces provided are consistent.

NOTES:

1) This patch introduces one subtle change in behavior which
   could not be easily avoided.  Prior to this change callers
   of 'zfs create -V ...' were guaranteed that upon exit the
   /dev/zvol/ block device link would be created or an error
   returned.  That's no longer the case.  The utilities will no
   longer block waiting for the symlink to be created.  Callers
   are now responsible for blocking, this is why a 'udev_wait'
   call was added to the 'label' function in scripts/common.sh.

2) The read-only behavior of a ZVOL now solely depends on if
   the ZVOL_RDONLY bit is set in zv->zv_flags.  The redundant
   policy setting in the gendisk structure was removed.  This
   both simplifies the code and allows us to safely leverage
   set_disk_ro() to issue a KOBJ_CHANGE uevent.  See the
   comment in the code for futher details on this.

3) Because __zvol_create_minor() and zvol_alloc() may now be
   called in a sync task they must use KM_PUSHPAGE.

References:
  illumos/illumos-gate@681d9761e8

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #1969
2013-12-16 09:15:57 -08:00

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/*
* CDDL HEADER SART
*
* 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 by Delphix. All rights reserved.
*/
#ifndef _LIBZFS_IMPL_H
#define _LIBZFS_IMPL_H
#include <sys/dmu.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_ioctl.h>
#include <sys/spa.h>
#include <sys/nvpair.h>
#include <libuutil.h>
#include <libzfs.h>
#include <libshare.h>
#include <libzfs_core.h>
#if defined(HAVE_LIBTOPO)
#include <fm/libtopo.h>
#endif /* HAVE_LIBTOPO */
#ifdef __cplusplus
extern "C" {
#endif
#ifdef VERIFY
#undef VERIFY
#endif
#define VERIFY verify
typedef struct libzfs_fru {
char *zf_device;
char *zf_fru;
struct libzfs_fru *zf_chain;
struct libzfs_fru *zf_next;
} libzfs_fru_t;
struct libzfs_handle {
int libzfs_error;
int libzfs_fd;
FILE *libzfs_mnttab;
FILE *libzfs_sharetab;
zpool_handle_t *libzfs_pool_handles;
uu_avl_pool_t *libzfs_ns_avlpool;
uu_avl_t *libzfs_ns_avl;
uint64_t libzfs_ns_gen;
int libzfs_desc_active;
char libzfs_action[1024];
char libzfs_desc[1024];
int libzfs_printerr;
int libzfs_storeerr; /* stuff error messages into buffer */
void *libzfs_sharehdl; /* libshare handle */
uint_t libzfs_shareflags;
boolean_t libzfs_mnttab_enable;
avl_tree_t libzfs_mnttab_cache;
int libzfs_pool_iter;
#if defined(HAVE_LIBTOPO)
topo_hdl_t *libzfs_topo_hdl;
libzfs_fru_t **libzfs_fru_hash;
libzfs_fru_t *libzfs_fru_list;
#endif /* HAVE_LIBTOPO */
char libzfs_chassis_id[256];
};
#define ZFSSHARE_MISS 0x01 /* Didn't find entry in cache */
struct zfs_handle {
libzfs_handle_t *zfs_hdl;
zpool_handle_t *zpool_hdl;
char zfs_name[ZFS_MAXNAMELEN];
zfs_type_t zfs_type; /* type including snapshot */
zfs_type_t zfs_head_type; /* type excluding snapshot */
dmu_objset_stats_t zfs_dmustats;
nvlist_t *zfs_props;
nvlist_t *zfs_user_props;
nvlist_t *zfs_recvd_props;
boolean_t zfs_mntcheck;
char *zfs_mntopts;
uint8_t *zfs_props_table;
};
/*
* This is different from checking zfs_type, because it will also catch
* snapshots of volumes.
*/
#define ZFS_IS_VOLUME(zhp) ((zhp)->zfs_head_type == ZFS_TYPE_VOLUME)
struct zpool_handle {
libzfs_handle_t *zpool_hdl;
zpool_handle_t *zpool_next;
char zpool_name[ZPOOL_MAXNAMELEN];
int zpool_state;
size_t zpool_config_size;
nvlist_t *zpool_config;
nvlist_t *zpool_old_config;
nvlist_t *zpool_props;
diskaddr_t zpool_start_block;
};
typedef enum {
PROTO_NFS = 0,
PROTO_SMB = 1,
PROTO_END = 2
} zfs_share_proto_t;
/*
* The following can be used as a bitmask and any new values
* added must preserve that capability.
*/
typedef enum {
SHARED_NOT_SHARED = 0x0,
SHARED_NFS = 0x2,
SHARED_SMB = 0x4
} zfs_share_type_t;
int zfs_error(libzfs_handle_t *, int, const char *);
int zfs_error_fmt(libzfs_handle_t *, int, const char *, ...);
void zfs_error_aux(libzfs_handle_t *, const char *, ...);
void *zfs_alloc(libzfs_handle_t *, size_t);
void *zfs_realloc(libzfs_handle_t *, void *, size_t, size_t);
char *zfs_asprintf(libzfs_handle_t *, const char *, ...);
char *zfs_strdup(libzfs_handle_t *, const char *);
int no_memory(libzfs_handle_t *);
int zfs_standard_error(libzfs_handle_t *, int, const char *);
int zfs_standard_error_fmt(libzfs_handle_t *, int, const char *, ...);
int zpool_standard_error(libzfs_handle_t *, int, const char *);
int zpool_standard_error_fmt(libzfs_handle_t *, int, const char *, ...);
int get_dependents(libzfs_handle_t *, boolean_t, const char *, char ***,
size_t *);
zfs_handle_t *make_dataset_handle_zc(libzfs_handle_t *, zfs_cmd_t *);
zfs_handle_t *make_dataset_simple_handle_zc(zfs_handle_t *, zfs_cmd_t *);
int zprop_parse_value(libzfs_handle_t *, nvpair_t *, int, zfs_type_t,
nvlist_t *, char **, uint64_t *, const char *);
int zprop_expand_list(libzfs_handle_t *hdl, zprop_list_t **plp,
zfs_type_t type);
/*
* Use this changelist_gather() flag to force attempting mounts
* on each change node regardless of whether or not it is currently
* mounted.
*/
#define CL_GATHER_MOUNT_ALWAYS 1
typedef struct prop_changelist prop_changelist_t;
int zcmd_alloc_dst_nvlist(libzfs_handle_t *, zfs_cmd_t *, size_t);
int zcmd_write_src_nvlist(libzfs_handle_t *, zfs_cmd_t *, nvlist_t *);
int zcmd_write_conf_nvlist(libzfs_handle_t *, zfs_cmd_t *, nvlist_t *);
int zcmd_expand_dst_nvlist(libzfs_handle_t *, zfs_cmd_t *);
int zcmd_read_dst_nvlist(libzfs_handle_t *, zfs_cmd_t *, nvlist_t **);
void zcmd_free_nvlists(zfs_cmd_t *);
int changelist_prefix(prop_changelist_t *);
int changelist_postfix(prop_changelist_t *);
void changelist_rename(prop_changelist_t *, const char *, const char *);
void changelist_remove(prop_changelist_t *, const char *);
void changelist_free(prop_changelist_t *);
prop_changelist_t *changelist_gather(zfs_handle_t *, zfs_prop_t, int, int);
int changelist_unshare(prop_changelist_t *, zfs_share_proto_t *);
int changelist_haszonedchild(prop_changelist_t *);
void remove_mountpoint(zfs_handle_t *);
int create_parents(libzfs_handle_t *, char *, int);
boolean_t isa_child_of(const char *dataset, const char *parent);
zfs_handle_t *make_dataset_handle(libzfs_handle_t *, const char *);
int zpool_open_silent(libzfs_handle_t *, const char *, zpool_handle_t **);
boolean_t zpool_name_valid(libzfs_handle_t *, boolean_t, const char *);
int zfs_validate_name(libzfs_handle_t *hdl, const char *path, int type,
boolean_t modifying);
void namespace_clear(libzfs_handle_t *);
/*
* libshare (sharemgr) interfaces used internally.
*/
extern int zfs_init_libshare(libzfs_handle_t *, int);
extern void zfs_uninit_libshare(libzfs_handle_t *);
extern int zfs_parse_options(char *, zfs_share_proto_t);
extern int zfs_unshare_proto(zfs_handle_t *,
const char *, zfs_share_proto_t *);
extern void libzfs_fru_clear(libzfs_handle_t *, boolean_t);
#ifdef __cplusplus
}
#endif
#endif /* _LIBZFS_IMPL_H */
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