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-rw-r--r--init/do_mounts_md.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
new file mode 100644
index 000000000..b84031528
--- /dev/null
+++ b/init/do_mounts_md.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/delay.h>
+#include <linux/raid/md_u.h>
+#include <linux/raid/md_p.h>
+
+#include "do_mounts.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 {
+ 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;
+ }
+ /* FALL THROUGH */
+ case 1: /* the first device is numeric */
+ str = str1;
+ /* FALL THROUGH */
+ 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(void)
+{
+ int minor, i, ent, partitioned;
+ dev_t dev;
+ dev_t devices[MD_SB_DISKS+1];
+
+ for (ent = 0; ent < md_setup_ents ; ent++) {
+ int fd;
+ int err = 0;
+ char *devname;
+ mdu_disk_info_t dinfo;
+ char name[16];
+
+ minor = md_setup_args[ent].minor;
+ partitioned = md_setup_args[ent].partitioned;
+ devname = md_setup_args[ent].device_names;
+
+ sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
+ if (partitioned)
+ dev = MKDEV(mdp_major, minor << MdpMinorShift);
+ else
+ dev = MKDEV(MD_MAJOR, minor);
+ create_dev(name, dev);
+ for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
+ char *p;
+ char comp_name[64];
+ u32 rdev;
+
+ 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);
+ rdev = bstat(comp_name);
+ if (rdev)
+ dev = new_decode_dev(rdev);
+ if (!dev) {
+ printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
+ break;
+ }
+
+ devices[i] = dev;
+
+ devname = p;
+ }
+ devices[i] = 0;
+
+ if (!i)
+ continue;
+
+ printk(KERN_INFO "md: Loading md%s%d: %s\n",
+ partitioned ? "_d" : "", minor,
+ md_setup_args[ent].device_names);
+
+ fd = ksys_open(name, 0, 0);
+ if (fd < 0) {
+ printk(KERN_ERR "md: open failed - cannot start "
+ "array %s\n", name);
+ continue;
+ }
+ if (ksys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
+ printk(KERN_WARNING
+ "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
+ minor);
+ ksys_close(fd);
+ continue;
+ }
+
+ if (md_setup_args[ent].level != LEVEL_NONE) {
+ /* non-persistent */
+ mdu_array_info_t ainfo;
+ ainfo.level = md_setup_args[ent].level;
+ ainfo.size = 0;
+ ainfo.nr_disks =0;
+ ainfo.raid_disks =0;
+ while (devices[ainfo.raid_disks])
+ ainfo.raid_disks++;
+ ainfo.md_minor =minor;
+ ainfo.not_persistent = 1;
+
+ ainfo.state = (1 << MD_SB_CLEAN);
+ ainfo.layout = 0;
+ ainfo.chunk_size = md_setup_args[ent].chunk;
+ err = ksys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
+ for (i = 0; !err && i <= MD_SB_DISKS; i++) {
+ dev = devices[i];
+ if (!dev)
+ break;
+ dinfo.number = i;
+ dinfo.raid_disk = i;
+ dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
+ dinfo.major = MAJOR(dev);
+ dinfo.minor = MINOR(dev);
+ err = ksys_ioctl(fd, ADD_NEW_DISK,
+ (long)&dinfo);
+ }
+ } else {
+ /* persistent */
+ for (i = 0; i <= MD_SB_DISKS; i++) {
+ dev = devices[i];
+ if (!dev)
+ break;
+ dinfo.major = MAJOR(dev);
+ dinfo.minor = MINOR(dev);
+ ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
+ }
+ }
+ if (!err)
+ err = ksys_ioctl(fd, RUN_ARRAY, 0);
+ if (err)
+ printk(KERN_WARNING "md: starting md%d failed\n", minor);
+ else {
+ /* reread the partition table.
+ * I (neilb) and not sure why this is needed, but I cannot
+ * boot a kernel with devfs compiled in from partitioned md
+ * array without it
+ */
+ ksys_close(fd);
+ fd = ksys_open(name, 0, 0);
+ ksys_ioctl(fd, BLKRRPART, 0);
+ }
+ ksys_close(fd);
+ }
+}
+
+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)
+{
+ int fd;
+
+ /*
+ * 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();
+
+ fd = ksys_open("/dev/md0", 0, 0);
+ if (fd >= 0) {
+ ksys_ioctl(fd, RAID_AUTORUN, raid_autopart);
+ ksys_close(fd);
+ }
+}
+
+void __init md_run_setup(void)
+{
+ create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
+
+ if (raid_noautodetect)
+ printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
+ else
+ autodetect_raid();
+ md_setup_drive();
+}
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