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https://github.com/freebsd/freebsd-src
synced 2024-07-21 18:27:22 +00:00
kboot: Rework hostdisk.c to allow easier ZFS support.
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
This commit is contained in:
Warner Losh
parent
5385c7e13b
commit
1a13008e98
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@ -28,6 +28,7 @@
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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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@ -40,6 +41,7 @@ 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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@ -52,6 +54,7 @@ struct devsw hostdisk = {
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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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@ -67,13 +70,16 @@ 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_name;
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uint64_t hd_size;
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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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@ -107,14 +113,20 @@ foreach_file(const char *dir, fef_cb_t cb, void *argp, u_int flags)
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}
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static void
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hostdisk_add_part(struct hdinfo *hd, const char *drv, uint64_t secs)
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hostdisk_add_part(hdinfo_t *hd, const char *drv, uint64_t secs)
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{
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struct hdinfo *md;
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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_name, drv, (uintmax_t)secs);
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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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md->hd_name = strdup(drv);
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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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@ -125,15 +137,16 @@ hostdisk_add_part(struct hdinfo *hd, const char *drv, uint64_t secs)
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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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struct hdinfo *hd = argp;
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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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if (strncmp(dent->d_name, hd->hd_name, strlen(hd->hd_name)) != 0)
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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->hd_name, dent->d_name);
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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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@ -141,23 +154,29 @@ hostdisk_one_part(struct host_dirent64 *dent, void *argp)
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}
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static void
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hostdisk_add_parts(struct hdinfo *hd)
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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->hd_name);
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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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struct hdinfo *hd;
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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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hd->hd_name = strdup(drv);
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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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@ -174,10 +193,30 @@ hostdisk_add_drive(const char *drv, uint64_t secs)
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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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@ -252,16 +291,17 @@ 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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desc->d_unit = host_open(desc->d_opendata, O_RDONLY, 0);
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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",
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(char *)desc->d_opendata, desc->d_unit);
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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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@ -280,8 +320,20 @@ hostdisk_close(struct open_file *f)
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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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return (EINVAL);
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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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@ -297,8 +349,8 @@ hostdisk_print(int verbose)
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STAILQ_FOREACH(hd, &hdinfo, hd_link) {
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snprintf(line, sizeof(line),
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" /dev/%s: %ju X %ju: %ju bytes\n",
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hd->hd_name,
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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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@ -306,8 +358,8 @@ hostdisk_print(int verbose)
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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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" /dev/%s: %ju X %ju: %ju bytes\n",
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md->hd_name,
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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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@ -323,5 +375,44 @@ hostdisk_print(int verbose)
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static char *
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hostdisk_fmtdev(struct devdesc *vdev)
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{
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return (vdev->d_opendata);
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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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