[PATCH] late-boot cleanups

RAID autoconfig rewritten to use syscalls and moved into do_mounts.c;
use of devfs_get_handle() in do_mounts.c also rewritten in syscalls.

1 files changed, 378 insertions, 10 deletions

diff --git a/init/do_mounts.c b/init/do_mounts.c
index b00b776ae48e..3c15c79ae708 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -20,6 +20,8 @@
 #include <linux/ext2_fs.h>
 #include <linux/romfs_fs.h>
 
+#include <linux/raid/md.h>
+
 #define BUILD_CRAMDISK
 
 extern int get_filesystem_list(char * buf);
@@ -36,6 +38,10 @@ extern asmlinkage long sys_symlink(const char *old, const char *new);
 extern asmlinkage long sys_mknod(const char *name, int mode, dev_t dev);
 extern asmlinkage long sys_umount(char *name, int flags);
 extern asmlinkage long sys_ioctl(int fd, int cmd, unsigned long arg);
+extern asmlinkage long sys_access(const char * filename, int mode);
+extern asmlinkage long sys_newstat(char * filename, struct stat * statbuf);
+extern asmlinkage long sys_getdents64(unsigned int fd, void * dirent,
+	unsigned int count);
 
 #ifdef CONFIG_BLK_DEV_INITRD
 unsigned int real_root_dev;	/* do_proc_dointvec cannot handle kdev_t */
@@ -315,25 +321,125 @@ static int __init mount_nfs_root(void)
 }
 #endif
 
+#ifdef CONFIG_DEVFS_FS
+static int __init do_read_dir(int fd, void *buf, int len)
+{
+	long bytes, n;
+	char *p = buf;
+	lseek(fd, 0, 0);
+
+	for (bytes = 0, p = buf; bytes < len; bytes += n, p+=n) {
+		n = sys_getdents64(fd, p, len - bytes);
+		if (n < 0)
+			return -1;
+		if (n == 0)
+			return bytes;
+	}
+	return 0;
+}
+
+static void * __init read_dir(char *path, int *len)
+{
+	int size;
+	int fd = open(path, 0, 0);
+
+	*len = 0;
+	if (fd < 0)
+		return NULL;
+
+	for (size = 1<<9; size < (1<<18); size <<= 1) {
+		void *p = kmalloc(size, GFP_KERNEL);
+		int n;
+		if (!p)
+			break;
+		n = do_read_dir(fd, p, size);
+		if (n > 0) {
+			close(fd);
+			*len = n;
+			return p;
+		}
+		kfree(p);
+		if (n < 0)
+			break;
+	}
+	close(fd);
+	return NULL;
+}
+#endif
+
+struct linux_dirent64 {
+	u64		d_ino;
+	s64		d_off;
+	unsigned short	d_reclen;
+	unsigned char	d_type;
+	char		d_name[0];
+};
+
+static int __init find_in_devfs(char *path, dev_t dev)
+{
+#ifdef CONFIG_DEVFS_FS
+	struct stat buf;
+	char *end = path + strlen(path);
+	int rest = path + 64 - end;
+	int size;
+	char *p = read_dir(path, &size);
+	char *s;
+
+	if (!p)
+		return -1;
+	for (s = p; s < p + size; s += ((struct linux_dirent64 *)s)->d_reclen) {
+		struct linux_dirent64 *d = (struct linux_dirent64 *)s;
+		if (strlen(d->d_name) + 2 > rest)
+			continue;
+		switch (d->d_type) {
+			case DT_BLK:
+				sprintf(end, "/%s", d->d_name);
+				if (sys_newstat(path, &buf) < 0)
+					break;
+				if (!S_ISBLK(buf.st_mode))
+					break;
+				if (buf.st_rdev != dev)
+					break;
+				kfree(p);
+				return 0;
+			case DT_DIR:
+				if (strcmp(d->d_name, ".") == 0)
+					break;
+				if (strcmp(d->d_name, "..") == 0)
+					break;
+				sprintf(end, "/%s", d->d_name);
+				if (find_in_devfs(path, dev) < 0)
+					break;
+				kfree(p);
+				return 0;
+		}
+	}
+	kfree(p);
+#endif
+	return -1;
+}
+
 static int __init create_dev(char *name, dev_t dev, char *devfs_name)
 {
-	void *handle;
 	char path[64];
-	int n;
 
 	sys_unlink(name);
 	if (!do_devfs)
 		return sys_mknod(name, S_IFBLK|0600, dev);
 
-	handle = devfs_get_handle(NULL, !dev ? devfs_name : NULL,
-				  MAJOR(dev), MINOR(dev), DEVFS_SPECIAL_BLK, 1);
-	if (!handle)
+	if (devfs_name && devfs_name[0]) {
+		if (strncmp(devfs_name, "/dev/", 5) == 0)
+			devfs_name += 5;
+		sprintf(path, "/dev/%s", devfs_name);
+		if (sys_access(path, 0) == 0)
+			return sys_symlink(devfs_name, name);
+	}
+	if (!dev)
 		return -1;
-	n = devfs_generate_path(handle, path + 5, sizeof (path) - 5);
-	devfs_put(handle);
-	if (n < 0)
+	strcpy(path, "/dev");
+	if (find_in_devfs(path, dev) < 0)
 		return -1;
-	return sys_symlink(path + n + 5, name);
+	return sys_symlink(path + 5, name);
 }
 
 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
@@ -730,12 +836,14 @@ static int __init initrd_load(void)
 	return rd_load_image("/dev/initrd");
 }
 
+static void __init md_run_setup(void);
+
 /*
  * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
  */
 void prepare_namespace(void)
 {
-	int is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
+	int is_floppy;
 	if (saved_root_name[0]) {
 		char *p = saved_root_name;
 		ROOT_DEV = name_to_dev_t(p);
@@ -743,6 +851,7 @@ void prepare_namespace(void)
 			p += 5;
 		strcpy(root_device_name, p);
 	}
+	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (!initrd_start)
 		mount_initrd = 0;
@@ -754,6 +863,8 @@ void prepare_namespace(void)
 	do_devfs = 1;
 #endif
 
+	md_run_setup();
+
 	create_dev("/dev/root", ROOT_DEV, NULL);
 
 	/* This has to be before mounting root, because even readonly mount of reiserfs would replay
@@ -922,3 +1033,260 @@ static int __init crd_load(int in_fd, int out_fd)
 }
 
 #endif  /* BUILD_CRAMDISK && CONFIG_BLK_DEV_RAM */
+
+#ifdef CONFIG_BLK_DEV_MD
+
+/*
+ * 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.
+ */
+
+struct {
+	int set;
+	int noautodetect;
+} raid_setup_args __initdata;
+
+static struct {
+	char device_set [MAX_MD_DEVS];
+	int pers[MAX_MD_DEVS];
+	int chunk[MAX_MD_DEVS];
+	char *device_names[MAX_MD_DEVS];
+} md_setup_args __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, pers;
+	char *pername = "";
+	char *str1 = str;
+
+	if (get_option(&str, &minor) != 2) {	/* MD Number */
+		printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
+		return 0;
+	}
+	if (minor >= MAX_MD_DEVS) {
+		printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
+		return 0;
+	} else if (md_setup_args.device_names[minor]) {
+		printk(KERN_WARNING "md: md=%d, Specified more than once. "
+		       "Replacing previous definition.\n", minor);
+	}
+	switch (get_option(&str, &level)) {	/* RAID Personality */
+	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.pers[minor] = level;
+			md_setup_args.chunk[minor] = 1 << (factor+12);
+			switch(level) {
+			case LEVEL_LINEAR:
+				pers = LINEAR;
+				pername = "linear";
+				break;
+			case 0:
+				pers = RAID0;
+				pername = "raid0";
+				break;
+			default:
+				printk(KERN_WARNING
+				       "md: The kernel has not been configured for raid%d support!\n",
+				       level);
+				return 0;
+			}
+			md_setup_args.pers[minor] = pers;
+			break;
+		}
+		/* FALL THROUGH */
+	case 1: /* the first device is numeric */
+		str = str1;
+		/* FALL THROUGH */
+	case 0:
+		md_setup_args.pers[minor] = 0;
+		pername="super-block";
+	}
+
+	printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
+		minor, pername, str);
+	md_setup_args.device_names[minor] = str;
+
+	return 1;
+}
+static void __init md_setup_drive(void)
+{
+	int minor, i;
+	dev_t dev;
+	dev_t devices[MD_SB_DISKS+1];
+
+	for (minor = 0; minor < MAX_MD_DEVS; minor++) {
+		int fd;
+		int err = 0;
+		char *devname;
+		mdu_disk_info_t dinfo;
+		char name[16], devfs_name[16];
+
+		if (!(devname = md_setup_args.device_names[minor]))
+			continue;
+		
+		sprintf(name, "/dev/md%d", minor);
+		sprintf(devfs_name, "/dev/md/%d", minor);
+		create_dev(name, MKDEV(MD_MAJOR, minor), devfs_name);
+		for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
+			char *p;
+			char comp_name[64];
+			struct stat buf;
+
+			p = strchr(devname, ',');
+			if (p)
+				*p++ = 0;
+
+			dev = name_to_dev_t(devname);
+			if (strncmp(devname, "/dev/", 5))
+				devname += 5;
+			snprintf(comp_name, 63, "/dev/%s", devname);
+			if (sys_newstat(comp_name, &buf) == 0 &&
+							S_ISBLK(buf.st_mode))
+				dev = buf.st_rdev;
+			if (!dev) {
+				printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
+				break;
+			}
+
+			devices[i] = dev;
+			md_setup_args.device_set[minor] = 1;
+
+			devname = p;
+		}
+		devices[i] = 0;
+
+		if (!md_setup_args.device_set[minor])
+			continue;
+
+		printk(KERN_INFO "md: Loading md%d: %s\n", minor, md_setup_args.device_names[minor]);
+
+		fd = open(name, 0, 0);
+		if (fd < 0) {
+			printk(KERN_ERR "md: open failed - cannot start array %d\n", minor);
+			continue;
+		}
+		if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
+			printk(KERN_WARNING
+			       "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
+			       minor);
+			close(fd);
+			continue;
+		}
+
+		if (md_setup_args.pers[minor]) {
+			/* non-persistent */
+			mdu_array_info_t ainfo;
+			ainfo.level = pers_to_level(md_setup_args.pers[minor]);
+			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.chunk[minor];
+			err = sys_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 = sys_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);
+				sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
+			}
+		}
+		if (!err)
+			err = sys_ioctl(fd, RUN_ARRAY, 0);
+		if (err)
+			printk(KERN_WARNING "md: starting md%d failed\n", minor);
+		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_setup_args.noautodetect = 1;
+		pos += wlen+1;
+	}
+	raid_setup_args.set = 1;
+	return 1;
+}
+
+__setup("raid=", raid_setup);
+__setup("md=", md_setup);
+#endif
+
+static void __init md_run_setup(void)
+{
+#ifdef CONFIG_BLK_DEV_MD
+	create_dev("md0", MKDEV(MD_MAJOR, 0), "md/0");
+	if (raid_setup_args.noautodetect)
+		printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
+	else {
+		int fd = open("/dev/md0", 0, 0);
+		if (fd >= 0) {
+			sys_ioctl(fd, RAID_AUTORUN, 0);
+			close(fd);
+		}
+	}
+	md_setup_drive();
+#endif
+}