1a13008e98
Keep a list of disks and partitions that we have. Keep track of the sizes of the media and sector and use that to implement DIOCGMEDIASIZE and DIOCGSECTORSIZE. Proivde a way to lookup disks by name. Sponsored by: Netflix Reviewed by: kevans (prior version) Differential Revision: https://reviews.freebsd.org/D38013
419 lines
9.8 KiB
C
419 lines
9.8 KiB
C
/*-
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* Copyright (C) 2014 Nathan Whitehorn
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* All rights reserved.
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* Copyright 2022 Netflix, Inc
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF 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/types.h>
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#include <sys/disk.h>
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#include <stdarg.h>
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#include "host_syscall.h"
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#include "kboot.h"
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static int hostdisk_init(void);
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static int hostdisk_strategy(void *devdata, int flag, daddr_t dblk,
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size_t size, char *buf, size_t *rsize);
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static int hostdisk_open(struct open_file *f, ...);
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static int hostdisk_close(struct open_file *f);
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static int hostdisk_ioctl(struct open_file *f, u_long cmd, void *data);
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static int hostdisk_print(int verbose);
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static char *hostdisk_fmtdev(struct devdesc *vdev);
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static int hostdisk_parsedev(struct devdesc **idev, const char *devspec, const char **path);
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struct devsw hostdisk = {
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.dv_name = "/dev",
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.dv_type = DEVT_HOSTDISK,
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.dv_init = hostdisk_init,
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.dv_strategy = hostdisk_strategy,
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.dv_open = hostdisk_open,
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.dv_close = hostdisk_close,
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.dv_ioctl = hostdisk_ioctl,
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.dv_print = hostdisk_print,
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.dv_cleanup = nullsys,
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.dv_fmtdev = hostdisk_fmtdev,
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.dv_parsedev = hostdisk_parsedev,
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};
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/*
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* We need to walk through the /sys/block directories looking for
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* block devices that we can use.
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*/
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#define SYSBLK "/sys/block"
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#define HOSTDISK_MIN_SIZE (16ul << 20) /* 16MB */
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typedef STAILQ_HEAD(, hdinfo) hdinfo_list_t;
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typedef struct hdinfo {
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STAILQ_ENTRY(hdinfo) hd_link; /* link in device list */
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hdinfo_list_t hd_children;
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struct hdinfo *hd_parent;
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const char *hd_dev;
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uint64_t hd_size; /* In bytes */
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uint64_t hd_sectors;
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uint64_t hd_sectorsize;
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int hd_flags;
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} hdinfo_t;
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#define dev2hd(d) ((hdinfo_t *)d->d_opendata)
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#define hd_name(hd) ((hd->hd_dev + 5))
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static hdinfo_list_t hdinfo = STAILQ_HEAD_INITIALIZER(hdinfo);
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typedef bool fef_cb_t(struct host_dirent64 *, void *);
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#define FEF_RECURSIVE 1
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static bool
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foreach_file(const char *dir, fef_cb_t cb, void *argp, u_int flags)
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{
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char dents[2048];
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int fd, dentsize;
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struct host_dirent64 *dent;
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fd = host_open(dir, O_RDONLY, 0);
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if (fd < 0) {
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printf("Can't open %s\n", dir);/* XXX */
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return (false);
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}
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while (1) {
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dentsize = host_getdents64(fd, dents, sizeof(dents));
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if (dentsize <= 0)
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break;
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for (dent = (struct host_dirent64 *)dents;
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(char *)dent < dents + dentsize;
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dent = (struct host_dirent64 *)((void *)dent + dent->d_reclen)) {
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if (!cb(dent, argp))
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break;
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}
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}
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host_close(fd);
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return (true);
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}
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static void
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hostdisk_add_part(hdinfo_t *hd, const char *drv, uint64_t secs)
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{
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hdinfo_t *md;
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char *dev;
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printf("hd %s adding %s %ju\n", hd->hd_dev, drv, (uintmax_t)secs);
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if ((md = calloc(1, sizeof(*md))) == NULL)
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return;
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if (asprintf(&dev, "/dev/%s", drv) == -1) {
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printf("hostdisk: no memory\n");
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free(md);
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return;
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}
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md->hd_dev = dev;
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md->hd_sectors = secs;
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md->hd_sectorsize = hd->hd_sectorsize;
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md->hd_size = md->hd_sectors * md->hd_sectorsize;
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md->hd_parent = hd;
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STAILQ_INSERT_TAIL(&hd->hd_children, md, hd_link);
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}
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static bool
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hostdisk_one_part(struct host_dirent64 *dent, void *argp)
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{
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hdinfo_t *hd = argp;
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char szfn[1024];
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uint64_t sz;
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/* Need to skip /dev/ at start of hd_name */
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if (strncmp(dent->d_name, hd_name(hd), strlen(hd_name(hd))) != 0)
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return (true);
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/* Find out how big this is -- no size not a disk */
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snprintf(szfn, sizeof(szfn), "%s/%s/%s/size", SYSBLK,
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hd_name(hd), dent->d_name);
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if (!file2u64(szfn, &sz))
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return true;
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hostdisk_add_part(hd, dent->d_name, sz);
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return true;
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}
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static void
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hostdisk_add_parts(hdinfo_t *hd)
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{
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char fn[1024];
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snprintf(fn, sizeof(fn), "%s/%s", SYSBLK, hd_name(hd));
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foreach_file(fn, hostdisk_one_part, hd, 0);
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}
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static void
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hostdisk_add_drive(const char *drv, uint64_t secs)
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{
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hdinfo_t *hd = NULL;
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char *dev = NULL;
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char fn[1024];
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if ((hd = calloc(1, sizeof(*hd))) == NULL)
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return;
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if (asprintf(&dev, "/dev/%s", drv) == -1) {
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printf("hostdisk: no memory\n");
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free(hd);
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return;
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}
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hd->hd_dev = dev;
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hd->hd_sectors = secs;
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snprintf(fn, sizeof(fn), "%s/%s/queue/hw_sector_size",
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SYSBLK, drv);
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if (!file2u64(fn, &hd->hd_sectorsize))
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goto err;
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hd->hd_size = hd->hd_sectors * hd->hd_sectorsize;
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if (hd->hd_size < HOSTDISK_MIN_SIZE)
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goto err;
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hd->hd_flags = 0;
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STAILQ_INIT(&hd->hd_children);
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printf("/dev/%s: %ju %ju %ju\n",
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drv, hd->hd_size, hd->hd_sectors, hd->hd_sectorsize);
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STAILQ_INSERT_TAIL(&hdinfo, hd, hd_link);
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hostdisk_add_parts(hd);
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return;
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err:
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free(dev);
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free(hd);
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return;
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}
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/* Find a disk / partition by its filename */
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static hdinfo_t *
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hostdisk_find(const char *fn)
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{
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hdinfo_t *hd, *md;
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STAILQ_FOREACH(hd, &hdinfo, hd_link) {
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if (strcmp(hd->hd_dev, fn) == 0)
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return (hd);
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STAILQ_FOREACH(md, &hd->hd_children, hd_link) {
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if (strcmp(md->hd_dev, fn) == 0)
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return (md);
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}
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}
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return (NULL);
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}
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static bool
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hostdisk_one_disk(struct host_dirent64 *dent, void *argp __unused)
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{
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char szfn[1024];
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uint64_t sz;
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/*
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* Skip . and ..
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*/
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if (strcmp(dent->d_name, ".") == 0 ||
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strcmp(dent->d_name, "..") == 0)
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return (true);
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/* Find out how big this is -- no size not a disk */
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snprintf(szfn, sizeof(szfn), "%s/%s/size", SYSBLK,
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dent->d_name);
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if (!file2u64(szfn, &sz))
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return (true);
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hostdisk_add_drive(dent->d_name, sz);
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return (true);
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}
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static void
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hostdisk_find_block_devices(void)
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{
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/*
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* Start here XXX open SYSBLK, walk through all directories, keep the
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* ones that return a size and a 'block' device when we 'stat' it. Try
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* to avoid partitions and only do raw devices.
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*/
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foreach_file(SYSBLK, hostdisk_one_disk, NULL, 0);
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}
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static int
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hostdisk_init(void)
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{
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hostdisk_find_block_devices();
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return (0);
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}
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static int
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hostdisk_strategy(void *devdata, int flag, daddr_t dblk, size_t size,
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char *buf, size_t *rsize)
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{
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struct devdesc *desc = devdata;
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daddr_t pos;
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int n;
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int64_t off;
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uint64_t res;
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uint32_t posl, posh;
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pos = dblk * 512;
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posl = pos & 0xffffffffu;
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posh = (pos >> 32) & 0xffffffffu;
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if ((off = host_llseek(desc->d_unit, posh, posl, &res, 0)) < 0) {
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printf("Seek error on fd %d to %ju (dblk %ju) returns %jd\n",
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desc->d_unit, (uintmax_t)pos, (uintmax_t)dblk, (intmax_t)off);
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return (EIO);
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}
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n = host_read(desc->d_unit, buf, size);
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if (n < 0)
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return (EIO);
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*rsize = n;
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return (0);
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}
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static int
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hostdisk_open(struct open_file *f, ...)
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{
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struct devdesc *desc;
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const char *fn;
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va_list vl;
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va_start(vl, f);
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desc = va_arg(vl, struct devdesc *);
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va_end(vl);
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fn = dev2hd(desc)->hd_dev;
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desc->d_unit = host_open(fn, O_RDONLY, 0);
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if (desc->d_unit <= 0) {
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printf("hostdisk_open: couldn't open %s: %d\n", fn, errno);
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return (ENOENT);
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}
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return (0);
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}
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static int
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hostdisk_close(struct open_file *f)
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{
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struct devdesc *desc = f->f_devdata;
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host_close(desc->d_unit);
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return (0);
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}
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static int
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hostdisk_ioctl(struct open_file *f, u_long cmd, void *data)
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{
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struct devdesc *desc = f->f_devdata;
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hdinfo_t *hd = dev2hd(desc);
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switch (cmd) {
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case DIOCGSECTORSIZE:
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*(u_int *)data = hd->hd_sectorsize;
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break;
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case DIOCGMEDIASIZE:
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*(uint64_t *)data = hd->hd_size;
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break;
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default:
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return (ENOTTY);
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}
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return (0);
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}
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static int
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hostdisk_print(int verbose)
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{
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char line[80];
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hdinfo_t *hd, *md;
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int ret = 0;
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printf("%s devices:", hostdisk.dv_name);
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if (pager_output("\n") != 0)
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return (1);
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STAILQ_FOREACH(hd, &hdinfo, hd_link) {
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snprintf(line, sizeof(line),
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" %s: %ju X %ju: %ju bytes\n",
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hd->hd_dev,
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(uintmax_t)hd->hd_sectors,
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(uintmax_t)hd->hd_sectorsize,
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(uintmax_t)hd->hd_size);
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if ((ret = pager_output(line)) != 0)
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break;
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STAILQ_FOREACH(md, &hd->hd_children, hd_link) {
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snprintf(line, sizeof(line),
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" %s: %ju X %ju: %ju bytes\n",
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md->hd_dev,
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(uintmax_t)md->hd_sectors,
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(uintmax_t)md->hd_sectorsize,
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(uintmax_t)md->hd_size);
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if ((ret = pager_output(line)) != 0)
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goto done;
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}
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}
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done:
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return (ret);
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}
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static char *
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hostdisk_fmtdev(struct devdesc *vdev)
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{
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return ((char *)hd_name(dev2hd(vdev)));
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}
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static int
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hostdisk_parsedev(struct devdesc **idev, const char *devspec, const char **path)
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{
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const char *cp;
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struct devdesc *dev;
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hdinfo_t *hd;
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int len;
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char *fn;
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/* Must start with /dev */
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if (strncmp(devspec, "/dev", 4) != 0)
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return (EINVAL);
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/* Must have a : in it */
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cp = strchr(devspec, ':');
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if (cp == NULL)
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return (EINVAL);
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/* XXX Stat the /dev or defer error handling to open(2) call? */
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if (path != NULL)
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*path = cp + 1;
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len = cp - devspec;
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fn = strdup(devspec);
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fn[len] = '\0';
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hd = hostdisk_find(fn);
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if (hd == NULL) {
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printf("Can't find hdinfo for %s\n", fn);
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return (EINVAL);
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}
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free(fn);
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dev = malloc(sizeof(*dev));
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if (dev == NULL)
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return (ENOMEM);
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dev->d_unit = 0;
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dev->d_dev = &hostdisk;
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dev->d_opendata = hd;
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*idev = dev;
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return (0);
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}
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