meta_rename.c revision c113cb3815ae16f5360027f4685c37e301d6341c
/*
* 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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Just in case we're not in a build environment, make sure that
* TEXT_DOMAIN gets set to something.
*/
#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
/*
* change the identity of a metadevice
* These are the "do it" functions for the metarename command.
*/
#include <string.h>
#include <meta.h>
#include <sys/lvm/md_rename.h>
/* private */
#define FORCE (0x00000001)
#define NOISY (0x00000010)
#define NOFLIP (0x00000020)
#define DRYRUN (0x00000040)
#define OP_STR(op) \
((op) == MDRNOP_EXCHANGE? "exchange": \
(op) == MDRNOP_RENAME? "rename": \
(op) == MDRNOP_UNK? "<unknown>": "garbage")
/*
* Check if from_np is open
* Return 0 if not open, -1 if open
*/
static int
check_open(
mdsetname_t *sp,
mdname_t *from_np,
md_error_t *ep)
{
int rc;
if ((rc = meta_isopen(sp, from_np, ep, (mdcmdopts_t)0)) < 0) {
assert(!mdisok(ep));
return (-1);
} else if (rc > 0) {
if (mdisok(ep)) {
(void) mdmderror(ep, MDE_RENAME_BUSY,
meta_getminor(from_np->dev),
from_np->cname);
}
return (-1);
}
return (0);
}
/*
* meta_swap is the common code used by the
* meta_rename() and meta_exchange() entry points
*/
static int
meta_swap(
mdsetname_t *sp,
mdname_t *from_np,
md_common_t *from_mdp,
mdname_t *to_np,
md_common_t *to_mdp,
md_renop_t op,
int flags,
md_error_t *ep)
{
md_rename_t txn;
int from_add_flag = 0;
int to_add_flag = 0;
int from_is_fn, to_is_fn;
bool_t from_has_parent, to_has_parent;
/*
* What types of devices we have here?
* For MDRNOP_RENAME to_mdp is NULL
*/
from_is_fn = (from_mdp->revision & MD_FN_META_DEV);
from_has_parent = MD_HAS_PARENT(from_mdp->parent);
if (to_mdp) {
to_is_fn = (to_mdp->revision & MD_FN_META_DEV);
to_has_parent = MD_HAS_PARENT(to_mdp->parent);
}
/*
* If the device exists a key may already exist so need to find it
* otherwise we'll end up adding the key in again which will lead
* to an inconsistent n_count for the namespace record.
*/
if (from_np->dev != NODEV) {
(void) meta_getnmentbydev(sp->setno, MD_SIDEWILD, from_np->dev,
NULL, NULL, &from_np->key, ep);
}
if (to_np->dev != NODEV) {
(void) meta_getnmentbydev(sp->setno, MD_SIDEWILD, to_np->dev,
NULL, NULL, &to_np->key, ep);
}
if ((from_np->key == MD_KEYWILD) || (from_np->key == MD_KEYBAD)) {
/*
* If we are top and revision indicates that we
* should have key but we don't then something
* really goes wrong
*/
assert(!from_has_parent && !from_is_fn);
if (from_has_parent || from_is_fn) {
return (-1);
}
/*
* So only add the entry if necessary
*/
if (add_key_name(sp, from_np, NULL, ep) != 0) {
assert(!mdisok(ep));
return (-1);
} else {
from_add_flag = 1;
}
}
(void) memset(&txn, 0, sizeof (txn));
txn.op = op;
txn.revision = MD_RENAME_VERSION;
txn.flags = 0;
txn.from.mnum = meta_getminor(from_np->dev);
txn.from.key = from_np->key;
if ((to_np->key == MD_KEYWILD) || (to_np->key == MD_KEYBAD)) {
/*
* If we are top and revision indicates that we
* should have key but we don't then something
* really goes wrong
*/
assert(!to_has_parent && !to_is_fn);
if (to_has_parent || to_is_fn) {
return (-1);
}
/*
* So only add the entry if necessary
*/
if (add_key_name(sp, to_np, NULL, ep) != 0) {
assert(!mdisok(ep));
if (from_add_flag)
(void) del_key_name(sp, from_np, ep);
return (-1);
} else {
to_add_flag = 1;
}
}
txn.to.mnum = meta_getminor(to_np->dev);
txn.to.key = to_np->key;
if (flags & NOISY) {
(void) fprintf(stderr, "\top: %s\n", OP_STR(txn.op));
(void) fprintf(stderr, "\trevision: %d, flags: %d\n",
txn.revision, txn.flags);
(void) fprintf(stderr,
"\tfrom(mnum,key): %ld, %d\tto: %ld, %d\n",
txn.from.mnum, txn.from.key,
txn.to.mnum, txn.to.key);
}
mdclrerror(ep);
if (metaioctl(MD_IOCRENAME, &txn, &txn.mde, from_np->cname) != 0) {
if (from_add_flag) {
(void) del_key_name(sp, from_np, ep);
/*
* Attempt removal of device node
*/
(void) metaioctl(MD_IOCREM_DEV, &txn.from.mnum,
ep, NULL);
}
if (op == MDRNOP_RENAME || to_add_flag) {
(void) del_key_name(sp, to_np, ep);
/*
* Attempt removal of device node
*/
(void) metaioctl(MD_IOCREM_DEV, &txn.to.mnum,
ep, NULL);
}
return (mdstealerror(ep, &txn.mde));
}
/*
* Since now the metadevice can be ref'd in the namespace
* by self and by the top device so upon the successful
* rename/xchange, we need to check the type and make
* necessary adjustment for the device's n_cnt in the namespace
* by calling add_key_name/del_key_name to do the tricks
*/
if (op == MDRNOP_RENAME && from_has_parent) {
(void) add_key_name(sp, to_np, NULL, ep);
if (from_is_fn)
(void) del_self_name(sp, from_np->key, ep);
}
if (op == MDRNOP_EXCHANGE && from_is_fn) {
(void) add_key_name(sp, from_np, NULL, ep);
}
/* force the name cache to re-read device state */
meta_invalidate_name(from_np);
meta_invalidate_name(to_np);
return (0);
}
/*
* rename a metadevice
*/
int
meta_rename(
mdsetname_t *sp,
mdname_t *from_np,
mdname_t *to_np,
mdcmdopts_t options,
md_error_t *ep
)
{
int flags = (options & MDCMD_FORCE)? FORCE: 0;
int rc = 0;
char *p;
md_common_t *from_mdp;
minor_t to_minor = meta_getminor(to_np->dev);
md_error_t status = mdnullerror;
md_error_t *t_ep = &status;
/* must have a set */
assert(sp != NULL);
assert(sp->setno == MD_MIN2SET(meta_getminor(from_np->dev)));
mdclrerror(ep);
if (((p = getenv("MD_DEBUG")) != NULL) &&
(strstr(p, "RENAME") != NULL)) {
flags |= NOISY;
}
/* if DOIT is not set, we are in dryrun mode */
if ((options & MDCMD_DOIT) == 0) {
flags |= DRYRUN;
}
if (metachkmeta(from_np, ep) != 0) {
assert(!mdisok(ep));
return (-1);
}
mdclrerror(ep);
if ((from_mdp = meta_get_unit(sp, from_np, ep)) == NULL) {
assert(!mdisok(ep));
return (-1);
}
if (meta_get_unit(sp, to_np, ep) != NULL) {
if (mdisok(ep)) {
(void) mdmderror(ep, MDE_UNIT_ALREADY_SETUP,
meta_getminor(to_np->dev),
to_np->cname);
}
return (-1);
}
mdclrerror(ep);
/*
* The dest device name has been added early on
* by meta_init_make_device call so get the entry from
* the namespace
*/
if (meta_getnmentbydev(sp->setno, MD_SIDEWILD, to_np->dev,
NULL, NULL, &to_np->key, ep) == NULL) {
return (-1);
}
/* If FORCE is not set, check if metadevice is open */
if (!(flags & FORCE)) {
if (check_open(sp, from_np, ep) != 0) {
(void) del_key_name(sp, to_np, t_ep);
(void) metaioctl(MD_IOCREM_DEV, &to_minor, t_ep, NULL);
return (-1);
}
}
/*
* All checks are done, now we do the real work.
* If we are in dryrun mode, clear the deivce node
* and we are done.
*/
if (flags & DRYRUN) {
(void) del_key_name(sp, to_np, t_ep);
(void) metaioctl(MD_IOCREM_DEV, &to_minor, t_ep, NULL);
return (0); /* success */
}
if (to_np->key == MD_KEYBAD || to_np->key == MD_KEYWILD) {
assert(!mdisok(ep));
return (-1);
}
rc = meta_swap(sp, from_np, from_mdp, to_np, NULL, MDRNOP_RENAME,
flags, ep);
if (rc == 0) {
if (options & MDCMD_PRINT) {
(void) fprintf(stdout, dgettext(TEXT_DOMAIN,
"%s: has been renamed to %s\n"),
from_np->cname, to_np->cname);
}
}
return (rc);
}
/*
* return TRUE if current <from>, <to> ordering would
* prevent <from> from being in the role of <self>
*/
static bool_t
meta_exchange_need_to_flip(
md_common_t *from_mdp,
md_common_t *to_mdp
)
{
assert(from_mdp);
assert(to_mdp);
/*
* ?
* \
* <to>
* \
* <from>
*/
if (MD_HAS_PARENT(from_mdp->parent)) {
if (MD_HAS_PARENT(to_mdp->parent)) {
if (from_mdp->parent ==
meta_getminor(to_mdp->namep->dev)) {
return (TRUE);
}
}
}
/*
* <from>
* \
* <to>
* \
* ?
*/
if (MD_HAS_PARENT(to_mdp->parent)) {
if (to_mdp->capabilities & MD_CAN_META_CHILD) {
return (TRUE);
}
}
/*
* <to>
* \
* <from>
*/
if (MD_HAS_PARENT(from_mdp->parent)) {
if (from_mdp->parent == meta_getminor(to_mdp->namep->dev)) {
if (!(from_mdp->capabilities & MD_CAN_META_CHILD)) {
return (TRUE);
}
}
}
/*
* <from> or <to>
* \ \
* <to> <from>
* \
* ?
*/
return (FALSE);
}
/*
* exchange the names of two metadevices
*/
int
meta_exchange(
mdsetname_t *sp,
mdname_t *from_np,
mdname_t *to_np,
mdcmdopts_t options,
md_error_t *ep
)
{
int flags = (options & MDCMD_FORCE)? FORCE: 0;
md_common_t *from_mdp, *to_mdp;
int rc;
char *p, *p2;
/* must have a set */
assert(sp != NULL);
assert(sp->setno == MD_MIN2SET(meta_getminor(from_np->dev)));
assert(sp->setno == MD_MIN2SET(meta_getminor(to_np->dev)));
if (metachkmeta(from_np, ep) != 0) {
assert(!mdisok(ep));
return (-1);
}
if (metachkmeta(to_np, ep) != 0) {
assert(!mdisok(ep));
return (-1);
}
if ((options & MDCMD_DOIT) == 0) {
flags |= DRYRUN;
}
if ((p = getenv("MD_DEBUG")) != NULL) {
if ((p2 = strstr(p, "EXCHANGE=")) != NULL) {
flags |= NOISY;
if ((p2 = strchr(p2, '=')) != NULL) {
if (strcmp((p2+1), "NOFLIP") == 0) {
flags |= NOFLIP;
}
}
} else if (strstr(p, "EXCHANGE") != NULL) {
flags |= NOISY;
}
}
if ((from_mdp = meta_get_unit(sp, from_np, ep)) == NULL) {
assert(!mdisok(ep));
return (-1);
}
if ((to_mdp = meta_get_unit(sp, to_np, ep)) == NULL) {
assert(!mdisok(ep));
return (-1);
}
assert(mdisok(ep));
/* If FORCE is not set, check if metadevice is open */
if (!(flags & FORCE)) {
if (check_open(sp, from_np, ep) != 0) {
return (-1);
}
}
/*
* All checks are done, now we do the real work.
* If we are in dryrun mode, we're done.
*/
if (flags & DRYRUN) {
return (0); /* success */
}
/*
* NOFLIP is used only for debugging; the driver
* will catch this and return MDE_RENAME_ORDER, if necessary
*/
if (((flags & NOFLIP) == 0) &&
meta_exchange_need_to_flip(from_mdp, to_mdp)) {
rc = meta_swap(sp, to_np, to_mdp, from_np, from_mdp,
MDRNOP_EXCHANGE, flags, ep);
} else {
rc = meta_swap(sp, from_np, from_mdp, to_np, to_mdp,
MDRNOP_EXCHANGE, flags, ep);
}
if (rc == 0) {
if (options & MDCMD_PRINT) {
(void) fprintf(stdout, dgettext(TEXT_DOMAIN,
"%s and %s have exchanged identities\n"),
from_np->cname, to_np->cname);
}
}
return (rc);
}