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linux-next/drivers/md/md-autodetect.c
Gustavo A. R. Silva df561f6688 treewide: Use fallthrough pseudo-keyword
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00

292 lines
7.6 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/init_syscalls.h>
#include <linux/raid/detect.h>
#include <linux/raid/md_u.h>
#include <linux/raid/md_p.h>
#include "md.h"
/*
* When md (and any require personalities) are compiled into the kernel
* (not a module), arrays can be assembles are boot time using with AUTODETECT
* where specially marked partitions are registered with md_autodetect_dev(),
* and with MD_BOOT where devices to be collected are given on the boot line
* with md=.....
* The code for that is here.
*/
#ifdef CONFIG_MD_AUTODETECT
static int __initdata raid_noautodetect;
#else
static int __initdata raid_noautodetect=1;
#endif
static int __initdata raid_autopart;
static struct md_setup_args {
int minor;
int partitioned;
int level;
int chunk;
char *device_names;
} md_setup_args[256] __initdata;
static int md_setup_ents __initdata;
/*
* Parse the command-line parameters given our kernel, but do not
* actually try to invoke the MD device now; that is handled by
* md_setup_drive after the low-level disk drivers have initialised.
*
* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
* assigns the task of parsing integer arguments to the
* invoked program now). Added ability to initialise all
* the MD devices (by specifying multiple "md=" lines)
* instead of just one. -- KTK
* 18May2000: Added support for persistent-superblock arrays:
* md=n,0,factor,fault,device-list uses RAID0 for device n
* md=n,-1,factor,fault,device-list uses LINEAR for device n
* md=n,device-list reads a RAID superblock from the devices
* elements in device-list are read by name_to_kdev_t so can be
* a hex number or something like /dev/hda1 /dev/sdb
* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
* Shifted name_to_kdev_t() and related operations to md_set_drive()
* for later execution. Rewrote section to make devfs compatible.
*/
static int __init md_setup(char *str)
{
int minor, level, factor, fault, partitioned = 0;
char *pername = "";
char *str1;
int ent;
if (*str == 'd') {
partitioned = 1;
str++;
}
if (get_option(&str, &minor) != 2) { /* MD Number */
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
str1 = str;
for (ent=0 ; ent< md_setup_ents ; ent++)
if (md_setup_args[ent].minor == minor &&
md_setup_args[ent].partitioned == partitioned) {
printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
"Replacing previous definition.\n", partitioned?"d":"", minor);
break;
}
if (ent >= ARRAY_SIZE(md_setup_args)) {
printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
return 0;
}
if (ent >= md_setup_ents)
md_setup_ents++;
switch (get_option(&str, &level)) { /* RAID level */
case 2: /* could be 0 or -1.. */
if (level == 0 || level == LEVEL_LINEAR) {
if (get_option(&str, &factor) != 2 || /* Chunk Size */
get_option(&str, &fault) != 2) {
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
md_setup_args[ent].level = level;
md_setup_args[ent].chunk = 1 << (factor+12);
if (level == LEVEL_LINEAR)
pername = "linear";
else
pername = "raid0";
break;
}
fallthrough;
case 1: /* the first device is numeric */
str = str1;
fallthrough;
case 0:
md_setup_args[ent].level = LEVEL_NONE;
pername="super-block";
}
printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
minor, pername, str);
md_setup_args[ent].device_names = str;
md_setup_args[ent].partitioned = partitioned;
md_setup_args[ent].minor = minor;
return 1;
}
static void __init md_setup_drive(struct md_setup_args *args)
{
char *devname = args->device_names;
dev_t devices[MD_SB_DISKS + 1], mdev;
struct mdu_array_info_s ainfo = { };
struct block_device *bdev;
struct mddev *mddev;
int err = 0, i;
char name[16];
if (args->partitioned) {
mdev = MKDEV(mdp_major, args->minor << MdpMinorShift);
sprintf(name, "md_d%d", args->minor);
} else {
mdev = MKDEV(MD_MAJOR, args->minor);
sprintf(name, "md%d", args->minor);
}
for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
struct kstat stat;
char *p;
char comp_name[64];
dev_t dev;
p = strchr(devname, ',');
if (p)
*p++ = 0;
dev = name_to_dev_t(devname);
if (strncmp(devname, "/dev/", 5) == 0)
devname += 5;
snprintf(comp_name, 63, "/dev/%s", devname);
if (init_stat(comp_name, &stat, 0) == 0 && S_ISBLK(stat.mode))
dev = new_decode_dev(stat.rdev);
if (!dev) {
pr_warn("md: Unknown device name: %s\n", devname);
break;
}
devices[i] = dev;
devname = p;
}
devices[i] = 0;
if (!i)
return;
pr_info("md: Loading %s: %s\n", name, args->device_names);
bdev = blkdev_get_by_dev(mdev, FMODE_READ, NULL);
if (IS_ERR(bdev)) {
pr_err("md: open failed - cannot start array %s\n", name);
return;
}
err = -EIO;
if (WARN(bdev->bd_disk->fops != &md_fops,
"Opening block device %x resulted in non-md device\n",
mdev))
goto out_blkdev_put;
mddev = bdev->bd_disk->private_data;
err = mddev_lock(mddev);
if (err) {
pr_err("md: failed to lock array %s\n", name);
goto out_blkdev_put;
}
if (!list_empty(&mddev->disks) || mddev->raid_disks) {
pr_warn("md: Ignoring %s, already autodetected. (Use raid=noautodetect)\n",
name);
goto out_unlock;
}
if (args->level != LEVEL_NONE) {
/* non-persistent */
ainfo.level = args->level;
ainfo.md_minor = args->minor;
ainfo.not_persistent = 1;
ainfo.state = (1 << MD_SB_CLEAN);
ainfo.chunk_size = args->chunk;
while (devices[ainfo.raid_disks])
ainfo.raid_disks++;
}
err = md_set_array_info(mddev, &ainfo);
for (i = 0; i <= MD_SB_DISKS && devices[i]; i++) {
struct mdu_disk_info_s dinfo = {
.major = MAJOR(devices[i]),
.minor = MINOR(devices[i]),
};
if (args->level != LEVEL_NONE) {
dinfo.number = i;
dinfo.raid_disk = i;
dinfo.state =
(1 << MD_DISK_ACTIVE) | (1 << MD_DISK_SYNC);
}
md_add_new_disk(mddev, &dinfo);
}
if (!err)
err = do_md_run(mddev);
if (err)
pr_warn("md: starting %s failed\n", name);
out_unlock:
mddev_unlock(mddev);
out_blkdev_put:
blkdev_put(bdev, FMODE_READ);
}
static int __init raid_setup(char *str)
{
int len, pos;
len = strlen(str) + 1;
pos = 0;
while (pos < len) {
char *comma = strchr(str+pos, ',');
int wlen;
if (comma)
wlen = (comma-str)-pos;
else wlen = (len-1)-pos;
if (!strncmp(str, "noautodetect", wlen))
raid_noautodetect = 1;
if (!strncmp(str, "autodetect", wlen))
raid_noautodetect = 0;
if (strncmp(str, "partitionable", wlen)==0)
raid_autopart = 1;
if (strncmp(str, "part", wlen)==0)
raid_autopart = 1;
pos += wlen+1;
}
return 1;
}
__setup("raid=", raid_setup);
__setup("md=", md_setup);
static void __init autodetect_raid(void)
{
/*
* Since we don't want to detect and use half a raid array, we need to
* wait for the known devices to complete their probing
*/
printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
wait_for_device_probe();
md_autostart_arrays(raid_autopart);
}
void __init md_run_setup(void)
{
int ent;
if (raid_noautodetect)
printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
else
autodetect_raid();
for (ent = 0; ent < md_setup_ents; ent++)
md_setup_drive(&md_setup_args[ent]);
}