b4cb3fe0e3
We want to keep our root file system open to preserve bcache segment between file accesses, thus reducing physical disk IO. Reviewed by: imp, allanjude, kevans (previous version) Differential Revision: https://reviews.freebsd.org/D30848 MFC after: 1 month
147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@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 AUTHOR 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 AUTHOR 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 <stand.h>
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#include "bootstrap.h"
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#include "libofw.h"
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#include "libzfs.h"
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static int ofw_parsedev(struct ofw_devdesc **, const char *, const char **);
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/*
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* Point (dev) at an allocated device specifier for the device matching the
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* path in (devspec). If it contains an explicit device specification,
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* use that. If not, use the default device.
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*/
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int
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ofw_getdev(void **vdev, const char *devspec, const char **path)
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{
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struct ofw_devdesc **dev = (struct ofw_devdesc **)vdev;
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int rv;
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/*
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* If it looks like this is just a path and no
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* device, go with the current device.
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*/
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if ((devspec == NULL) ||
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((strchr(devspec, '@') == NULL) &&
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(strchr(devspec, ':') == NULL))) {
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if (((rv = ofw_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
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(path != NULL))
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*path = devspec;
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return(rv);
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}
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/*
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* Try to parse the device name off the beginning of the devspec
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*/
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return(ofw_parsedev(dev, devspec, path));
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}
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/*
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* Point (dev) at an allocated device specifier matching the string version
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* at the beginning of (devspec). Return a pointer to the remaining
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* text in (path).
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*/
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static int
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ofw_parsedev(struct ofw_devdesc **dev, const char *devspec, const char **path)
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{
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struct ofw_devdesc *idev;
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struct devsw *dv;
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phandle_t handle;
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const char *p;
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const char *s;
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char *ep;
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char name[256];
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char type[64];
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int err;
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int len;
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int i;
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for (p = s = devspec; *s != '\0'; p = s) {
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if ((s = strchr(p + 1, '/')) == NULL)
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s = strchr(p, '\0');
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len = s - devspec;
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bcopy(devspec, name, len);
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name[len] = '\0';
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if ((handle = OF_finddevice(name)) == -1) {
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bcopy(name, type, len);
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type[len] = '\0';
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} else if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
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continue;
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for (i = 0; (dv = devsw[i]) != NULL; i++) {
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if (strncmp(dv->dv_name, type, strlen(dv->dv_name)) == 0)
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goto found;
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}
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}
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return(ENOENT);
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found:
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if (path != NULL)
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*path = s;
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idev = malloc(sizeof(struct ofw_devdesc));
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if (idev == NULL) {
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printf("ofw_parsedev: malloc failed\n");
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return ENOMEM;
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}
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strcpy(idev->d_path, name);
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idev->dd.d_dev = dv;
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if (dv->dv_type == DEVT_ZFS) {
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p = devspec + strlen(dv->dv_name);
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err = zfs_parsedev((struct zfs_devdesc *)idev, p, path);
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if (err != 0) {
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free(idev);
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return (err);
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}
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}
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if (dev == NULL) {
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free(idev);
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} else {
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*dev = idev;
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}
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return(0);
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}
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int
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ofw_setcurrdev(struct env_var *ev, int flags, const void *value)
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{
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struct ofw_devdesc *ncurr;
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int rv;
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if ((rv = ofw_parsedev(&ncurr, value, NULL)) != 0)
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return (rv);
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free(ncurr);
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return (mount_currdev(ev, flags, value));
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}
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