OpenSolaris_b135/lib/libvolmgt/common/volmgt_on_private.c
/*
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* routines in this module are meant to be called by other libvolmgt
* routines only
*/
#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <string.h>
#ifdef DEBUG
#include <errno.h>
#endif
#include <libintl.h>
#include <limits.h>
#include <unistd.h>
#include <stdlib.h>
#include <volmgt.h>
#include <sys/types.h>
#include <sys/mkdev.h>
#include <sys/stat.h>
#include <sys/dkio.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <sys/mnttab.h>
#include "volmgt_private.h"
#define NULL_PATH "/dev/null"
static int vol_getmntdev(FILE *, struct mnttab *, dev_t,
struct dk_cinfo *);
/*
* This is an ON Consolidation Private interface.
*
* Is the specified path mounted?
*
* This function is really inadequate for ejection testing. For example,
* I could have /dev/fd0a mounted and eject /dev/fd0c, and it would be
* ejected. There needs to be some better way to make this check, although
* short of looking up the mounted dev_t in the kernel mount table and
* building in all kinds of knowledge into this function, I'm not sure
* how to do it.
*/
int
_dev_mounted(char *path)
{
int fd = -1;
struct dk_cinfo info;
static FILE *fp = NULL; /* mnttab file pointer */
struct mnttab mnt; /* set bug not used */
char *cn = NULL; /* char spcl pathname */
struct stat64 sb;
int ret_val = 0;
/* ensure we have the block spcl pathname */
if ((cn = (char *)volmgt_getfullrawname(path)) == NULL) {
goto dun;
}
if ((fp = fopen(MNTTAB, "rF")) == NULL) {
/* mtab is gone... let him go */
goto dun;
}
if ((fd = open(cn, O_RDONLY|O_NDELAY)) < 0) {
goto dun;
}
if (fstat64(fd, &sb) < 0) {
goto dun;
}
if (ioctl(fd, DKIOCINFO, &info) != 0) {
goto dun;
}
if (vol_getmntdev(fp, &mnt, sb.st_rdev, &info) != 0) {
ret_val = 1; /* match found! */
}
dun:
if (cn != NULL) {
free(cn);
}
if (fp != NULL) {
(void) fclose(fp);
}
if (fd >= 0) {
(void) close(fd);
}
return (ret_val);
}
static int call_unmount_prog(int, int, char *, int, char *,
char *);
static int get_media_info(char *, char **, int *, char **);
/*
* This is an ON Consolidation Private interface.
*
* Forks off rmmount and (in essence) returns the result
*
* a return value of 0 (FALSE) means failure, non-zero (TRUE) means success
*/
int
_dev_unmount(char *path)
{
char *bn = NULL; /* block name */
char *mtype = NULL; /* media type */
char *spcl = NULL; /* special dev. path */
char *spcl_failed = NULL; /* spcl that failed */
int ret_val = FALSE; /* what we return */
char *vr; /* volmgt root dir */
int media_info_gotten = 0;
int mnum = 0;
int volume_is_not_managed;
char *pathbuf, *absname;
if ((bn = (char *)volmgt_getfullblkname(path)) == NULL) {
goto dun;
}
if ((pathbuf = malloc(PATH_MAX+1)) == NULL)
goto dun;
absname = bn;
if (realpath(bn, pathbuf) != NULL)
absname = pathbuf;
volume_is_not_managed = !volmgt_running() ||
(!volmgt_ownspath(absname) && volmgt_symname(bn) == NULL);
free(pathbuf);
/* decide of we should use rmmount to unmount the media */
if (!volume_is_not_managed) {
int use_rmm = FALSE; /* use rmmount?? */
/* at least volmgt is running */
vr = (char *)volmgt_root();
if (strncmp(bn, vr, strlen(vr)) == 0) {
/* the block path is rooted in /vol */
use_rmm = TRUE;
}
/* try to get info about media */
media_info_gotten = get_media_info(bn, &mtype, &mnum, &spcl);
ret_val = call_unmount_prog(media_info_gotten, use_rmm, mtype,
mnum, spcl, bn);
} else {
/* volmgt is *not* running */
if (get_media_info(bn, &mtype, &mnum, &spcl)) {
/*
* volmgt is off and get_media_info() has returned
* info on the media -- soo (this is kinda' a hack)
* ... we iterate, looking for multiple slices
* of (say) a floppy being mounted
*
* note: if an unmount fails we don't want to try
* to unmount the same device on the next try, so
* we try to watch for that
*/
do {
/*
* don't call the unmount program is we're just
* trying to unmount the same device that
* failed last time -- if that's the case,
* then bail
*/
if (spcl_failed != NULL) {
if (strcmp(spcl, spcl_failed) == 0) {
break;
}
}
ret_val = call_unmount_prog(TRUE, FALSE,
mtype, mnum, spcl, bn);
if (!ret_val) {
/* save spcl device name that failed */
spcl_failed = strdup(spcl);
} else {
/*
* unmount succeeded, so clean up
*/
if (spcl_failed != NULL) {
free(spcl_failed);
spcl_failed = NULL;
}
}
} while (get_media_info(bn, &mtype, &mnum, &spcl));
} else {
/* just do the unmmount cycle once */
ret_val = call_unmount_prog(FALSE, FALSE, NULL, 0,
NULL, bn);
}
}
if (mtype != NULL) {
free(mtype);
}
if (spcl != NULL) {
free(spcl);
}
if (spcl_failed != NULL) {
free(spcl_failed);
}
if (bn != NULL) {
free(bn);
}
dun:
return (ret_val);
}
/*
* find a mnttab entry that has the same dev as the supplied dev,
* returning it and a non-zero value if found, else returning 0
*
* this is just like getmntany(), except that it scans based on st_rdev,
* and it even finds different slices on the same device/unit (thanx to
* code copied from format.c)
*/
static int
vol_getmntdev(FILE *fp, struct mnttab *mp, dev_t dev, struct dk_cinfo *ip)
{
int fd; /* dev-in-question fd */
struct stat64 sb; /* dev-in-question stat struct */
int ret_val = 0; /* default value: no match found */
char *cn; /* char pathname */
struct dk_cinfo dkinfo; /* for testing for slices */
#ifdef DEBUG
denter(
"vol_getmntdev: entering for %d.%d, ctype/cnum/unit = %d/%d/%d\n",
(int)major(dev), (int)minor(dev), ip->dki_ctype, ip->dki_cnum,
ip->dki_unit);
#endif
/* reset the mnttab -- just in case */
rewind(fp);
/* scan each entry in mnttab */
while (getmntent(fp, mp) == 0) {
/* don't even try unless it's a local pathname */
if (mp->mnt_special[0] != '/') {
continue;
}
/* get char pathname */
if ((cn = volmgt_getfullrawname(mp->mnt_special)) == NULL) {
continue;
}
if (cn[0] == NULLC) {
free(cn);
continue; /* couldn't get raw name */
}
/* open the device */
if ((fd = open(cn, O_RDONLY|O_NDELAY)) < 0) {
/* if we can't open it *assume* it's not a match */
free(cn);
continue;
}
/* stat the device */
if (fstat64(fd, &sb) < 0) {
free(cn);
(void) close(fd);
continue; /* ain't there: can't be a match */
}
/* ensure we have a spcl device (a double check) */
if (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode)) {
free(cn);
(void) close(fd);
continue;
}
/* (almost) finally -- check the dev_t for equality */
if (sb.st_rdev == dev) {
ret_val = 1; /* match found! */
free(cn);
(void) close(fd);
break;
}
/*
* check that the major numbers match, since if they
* don't then there's no reason to use the DKIOCINFO
* ioctl to see if we have to major/minor pairs that
* really point to the same device
*/
if (major(sb.st_rdev) != major(dev)) {
/* no use continuing, since major devs are different */
free(cn);
(void) close(fd);
continue;
}
/* one last check -- for diff. slices of the same dev/unit */
if (ioctl(fd, DKIOCINFO, &dkinfo) < 0) {
free(cn);
(void) close(fd);
continue;
}
free(cn); /* all done with raw pathname */
(void) close(fd); /* all done with file descriptor */
/* if ctrler type/number and unit match, it's a match */
if ((ip->dki_ctype == dkinfo.dki_ctype) &&
(ip->dki_cnum == dkinfo.dki_cnum) &&
(ip->dki_unit == dkinfo.dki_unit)) {
/*
* even though minor numbers differ we have a
* match
*/
ret_val = 1;
break;
}
/* go around again */
}
return (ret_val);
}
char *
vol_basename(char *path)
{
char *cp;
/* check for the degenerate case */
if (strcmp(path, "/") == 0) {
return (path);
}
/* look for the last slash in the name */
if ((cp = strrchr(path, '/')) == NULL) {
/* no slash */
return (path);
}
/* ensure something is after the slash */
if (*++cp != NULLC) {
return (cp);
}
/* a name that ends in slash -- back up until previous slash */
while (cp != path) {
if (*--cp == '/') {
return (--cp);
}
}
/* the only slash is the end of the name */
return (path);
}
static int vol_getmntdev(FILE *, struct mnttab *, dev_t,
struct dk_cinfo *);
static int
get_media_info(char *path, char **mtypep, int *mnump, char **spclp)
{
FILE *fp = NULL;
int fd = -1;
char *cn = NULL; /* char spcl pathname */
struct stat64 sb;
struct dk_cinfo info;
struct mnttab mnt;
int ret_val = FALSE;
if ((fp = fopen(MNTTAB, "rF")) == NULL) {
/* mtab is gone... let him go */
goto dun;
}
/* get char spcl pathname */
if ((cn = volmgt_getfullrawname(path)) == NULL) {
goto dun;
}
if (cn[0] == NULLC) {
goto dun;
}
if ((fd = open(cn, O_RDONLY|O_NDELAY)) < 0) {
goto dun;
}
if (fstat64(fd, &sb) < 0) {
goto dun;
}
if (ioctl(fd, DKIOCINFO, &info) != 0) {
goto dun;
}
/* if we found the entry then disect it */
if (vol_getmntdev(fp, &mnt, sb.st_rdev, &info) != 0) {
char *cp;
char *mtype;
char *mnt_dir;
int mtype_len;
DIR *dirp = NULL;
struct dirent64 *dp;
char *volname;
/* return the spcl device name found */
*spclp = strdup(mnt.mnt_special);
/*
* try to get the media type (e.g. "floppy") from the mount
* point (e.g. "/floppy/NAME") if vold is running
*/
if (!volmgt_running() ||
(!volmgt_ownspath(*spclp) &&
volmgt_symname(*spclp) == NULL)) {
ret_val = TRUE; /* success (if limited) */
goto dun;
}
/* get the first part of the mount point (e.g. "floppy") */
cp = mnt.mnt_mountp;
if (*cp++ != '/') {
goto dun;
}
mtype = cp;
if ((cp = strchr(mtype, '/')) == NULL) {
goto dun;
}
*cp++ = NULLC;
mnt_dir = mnt.mnt_mountp; /* save dir path */
/* get the volume name (e.g. "unnamed_floppy") */
volname = cp;
/* scan for the symlink that points to our volname */
if ((dirp = opendir(mnt_dir)) == NULL) {
goto dun;
}
mtype_len = strlen(mtype);
while ((dp = readdir64(dirp)) != NULL) {
char lpath[2 * (MAXNAMELEN+1)];
char linkbuf[MAXPATHLEN+4];
int lb_len;
struct stat64 sb;
if (strncmp(dp->d_name, mtype, mtype_len) != 0) {
continue; /* not even close */
}
(void) sprintf(lpath, "%s/%s", mnt_dir,
dp->d_name);
if (lstat64(lpath, &sb) < 0) {
continue; /* what? */
}
if (!S_ISLNK(sb.st_mode)) {
continue; /* not our baby */
}
if ((lb_len = readlink(lpath, linkbuf,
sizeof (linkbuf))) < 0) {
continue;
}
linkbuf[lb_len] = NULLC; /* null terminate */
if ((cp = vol_basename(linkbuf)) == NULL) {
continue;
}
/* now we have the name! */
if (strcmp(cp, volname) == 0) {
/* found it !! */
if (sscanf(dp->d_name + mtype_len, "%d",
mnump) == 1) {
*mtypep = strdup(mtype);
ret_val = TRUE;
}
break;
}
}
(void) closedir(dirp);
}
dun:
if (fp != NULL) {
(void) fclose(fp);
}
if (fd >= 0) {
(void) close(fd);
}
if (cn != NULL) {
free(cn);
}
#ifdef DEBUG
if (ret_val) {
dexit("get_media_info: returning mtype=%s, mnum=%d, spcl=%s\n",
*mtypep == NULL ? "<null ptr>" : *mtypep,
*mnump,
*spclp == NULL ? "<null ptr>" : *spclp);
} else {
dexit("get_media_info: FAILED\n");
}
#endif
return (ret_val);
}
/*
* call the appropriate unmount program, returning its success (TRUE)
* or failure (FALSE)
*/
static int
call_unmount_prog(int mi_gotten, int use_rmm, char *mtype, int mnum,
char *spcl, char *bn)
{
pid_t pid; /* forked proc's pid */
int ret_val = FALSE;
const char *etc_umount = "/etc/umount";
const char *rmm = "/usr/sbin/rmmount";
int rval; /* proc's return value */
#ifdef DEBUG
denter(
"call_unmount_prog(%s, %s, \"%s\", %d, \"%s\", \"%s\"): entering\n",
mi_gotten ? "TRUE" : "FALSE", use_rmm ? "TRUE" : "FALSE",
mtype ? mtype : "<null ptr>", mnum, spcl ? spcl : "<null ptr>",
bn);
#endif
/* create a child to unmount the path */
if ((pid = fork()) < 0) {
goto dun;
}
if (pid == 0) {
/* the child */
#ifndef DEBUG
int xfd;
#endif
char env_buf[MAXPATHLEN];
#ifndef DEBUG
/* get rid of those nasty err messages */
if ((xfd = open(NULL_PATH, O_RDWR)) >= 0) {
(void) dup2(xfd, fileno(stdin));
(void) dup2(xfd, fileno(stdout));
(void) dup2(xfd, fileno(stderr));
}
#endif
if (use_rmm) {
/* set up environment vars */
(void) putenv("VOLUME_ACTION=eject");
(void) putenv(strdup(env_buf));
if (mi_gotten) {
(void) sprintf(env_buf,
"VOLUME_MEDIATYPE=%s", mtype);
(void) putenv(strdup(env_buf));
(void) sprintf(env_buf, "VOLUME_SYMDEV=%s%d",
mtype, mnum);
(void) putenv(strdup(env_buf));
(void) sprintf(env_buf, "VOLUME_PATH=%s",
spcl);
(void) putenv(strdup(env_buf));
(void) sprintf(env_buf, "VOLUME_NAME=%s",
vol_basename(spcl));
(void) putenv(strdup(env_buf));
} else {
(void) sprintf(env_buf, "VOLUME_PATH=%s", bn);
(void) putenv(strdup(env_buf));
(void) sprintf(env_buf, "VOLUME_NAME=%s",
vol_basename(bn));
(void) putenv(strdup(env_buf));
}
#ifdef DEBUG
dprintf("call_unmount_prog: calling \"%s -D\"\n", rmm);
(void) execl(rmm, rmm, "-D", NULL);
#else
(void) execl(rmm, rmm, NULL);
#endif
} else {
#ifdef DEBUG
dprintf("call_unmount_prog: calling \"%s %s\"\n",
etc_umount, mi_gotten ? spcl : bn);
#endif
(void) execl(etc_umount, etc_umount,
mi_gotten ? spcl : bn,
NULL);
}
exit(-1);
/*NOTREACHED*/
}
/* wait for the umount command to exit */
if (waitpid(pid, &rval, 0) == pid) {
if (WIFEXITED(rval)) {
if (WEXITSTATUS(rval) == 0) {
ret_val = TRUE; /* success */
}
}
}
dun:
return (ret_val);
}