f805f204b6
- Add a routine for looking up a device and checking if it is a valid geom provider given a partial or full path to its device node. Reviewed by: phk Approved by: pjd (mentor)
317 lines
6.2 KiB
C
317 lines
6.2 KiB
C
/*-
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/disk.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <paths.h>
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#include <libgeom.h>
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static char *g_device_path_open(const char *, int *, int);
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/*
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* Open the given provider and at least check if this is a block device.
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*/
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int
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g_open(const char *name, int dowrite)
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{
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char *path;
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int fd;
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path = g_device_path_open(name, &fd, dowrite);
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if (path != NULL)
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free(path);
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if (fd == -1)
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return (-1);
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return (fd);
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}
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int
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g_close(int fd)
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{
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return (close(fd));
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}
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static int
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g_ioctl_arg(int fd, unsigned long cmd, void *arg)
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{
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int ret;
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if (arg != NULL)
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ret = ioctl(fd, cmd, arg);
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else
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ret = ioctl(fd, cmd);
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return (ret >= 0 ? 0 : -1);
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}
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static int
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g_ioctl(int fd, unsigned long cmd)
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{
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return (g_ioctl_arg(fd, cmd, NULL));
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}
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/*
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* Return media size of the given provider.
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*/
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off_t
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g_mediasize(int fd)
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{
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off_t mediasize;
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if (g_ioctl_arg(fd, DIOCGMEDIASIZE, &mediasize) == -1)
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mediasize = -1;
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return (mediasize);
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}
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/*
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* Return sector size of the given provider.
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*/
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ssize_t
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g_sectorsize(int fd)
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{
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u_int sectorsize;
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if (g_ioctl_arg(fd, DIOCGSECTORSIZE, §orsize) == -1)
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return (-1);
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return ((ssize_t)sectorsize);
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}
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/*
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* Return the correct provider name.
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*/
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char *
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g_providername(int fd)
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{
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char name[MAXPATHLEN];
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if (g_ioctl_arg(fd, DIOCGPROVIDERNAME, name) == -1)
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return (NULL);
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return (strdup(name));
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}
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/*
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* Call BIO_FLUSH for the given provider.
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*/
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int
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g_flush(int fd)
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{
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return (g_ioctl(fd, DIOCGFLUSH));
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}
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/*
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* Call BIO_DELETE for the given range.
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*/
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int
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g_delete(int fd, off_t offset, off_t length)
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{
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off_t arg[2];
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arg[0] = offset;
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arg[1] = length;
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return (g_ioctl_arg(fd, DIOCGDELETE, arg));
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}
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/*
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* Return ID of the given provider.
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*/
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int
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g_get_ident(int fd, char *ident, size_t size)
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{
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char lident[DISK_IDENT_SIZE];
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if (g_ioctl_arg(fd, DIOCGIDENT, lident) == -1)
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return (-1);
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if (lident[0] == '\0') {
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errno = ENOENT;
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return (-1);
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}
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if (strlcpy(ident, lident, size) >= size) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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return (0);
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}
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/*
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* Return name of the provider, which has the given ID.
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*/
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int
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g_get_name(const char *ident, char *name, size_t size)
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{
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int fd;
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fd = g_open_by_ident(ident, 0, name, size);
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if (fd == -1)
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return (-1);
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g_close(fd);
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return (0);
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}
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/*
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* Find provider name by the given ID.
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*/
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int
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g_open_by_ident(const char *ident, int dowrite, char *name, size_t size)
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{
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char lident[DISK_IDENT_SIZE];
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struct gmesh mesh;
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struct gclass *mp;
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struct ggeom *gp;
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struct gprovider *pp;
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int error, fd;
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error = geom_gettree(&mesh);
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if (error != 0) {
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errno = error;
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return (-1);
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}
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error = ENOENT;
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fd = -1;
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LIST_FOREACH(mp, &mesh.lg_class, lg_class) {
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LIST_FOREACH(gp, &mp->lg_geom, lg_geom) {
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LIST_FOREACH(pp, &gp->lg_provider, lg_provider) {
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fd = g_open(pp->lg_name, dowrite);
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if (fd == -1)
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continue;
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if (g_get_ident(fd, lident,
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sizeof(lident)) == -1) {
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g_close(fd);
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continue;
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}
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if (strcmp(ident, lident) != 0) {
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g_close(fd);
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continue;
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}
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error = 0;
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if (name != NULL && strlcpy(name, pp->lg_name,
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size) >= size) {
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error = ENAMETOOLONG;
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g_close(fd);
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}
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goto end;
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}
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}
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}
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end:
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geom_deletetree(&mesh);
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if (error != 0) {
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errno = error;
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return (-1);
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}
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return (fd);
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}
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/*
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* Return the device path device given a partial or full path to its node.
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* A pointer can be provided, which will be set to an opened file descriptor of
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* not NULL.
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*/
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static char *
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g_device_path_open(const char *devpath, int *fdp, int dowrite)
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{
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char *path;
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int fd;
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/* Make sure that we can fail. */
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if (fdp != NULL)
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*fdp = -1;
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/* Use the device node if we're able to open it. */
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do {
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fd = open(devpath, dowrite ? O_RDWR : O_RDONLY);
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if (fd == -1)
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break;
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/*
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* Let try to get sectorsize, which will prove it is a GEOM
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* provider.
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*/
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if (g_sectorsize(fd) == -1) {
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close(fd);
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errno = EFTYPE;
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return (NULL);
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}
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if ((path = strdup(devpath)) == NULL) {
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close(fd);
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return (NULL);
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}
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if (fdp != NULL)
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*fdp = fd;
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else
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close(fd);
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return (path);
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} while (0);
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/* If we're not given an absolute path, assume /dev/ prefix. */
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if (*devpath != '/') {
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asprintf(&path, "%s%s", _PATH_DEV, devpath);
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if (path == NULL)
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return (NULL);
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fd = open(path, dowrite ? O_RDWR : O_RDONLY);
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if (fd == -1) {
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free(path);
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return (NULL);
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}
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/*
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* Let try to get sectorsize, which will prove it is a GEOM
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* provider.
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*/
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if (g_sectorsize(fd) == -1) {
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free(path);
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close(fd);
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errno = EFTYPE;
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return (NULL);
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}
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if (fdp != NULL)
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*fdp = fd;
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else
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close(fd);
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return (path);
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}
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return (NULL);
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}
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char *
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g_device_path(const char *devpath)
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{
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return (g_device_path_open(devpath, NULL, 0));
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}
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