[PATCH] Wait and retry mounting root device

[Daniel Drake <dsd@gentoo.org>]

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This is based a patch by William Park <opengeometry@yahoo.ca> included in
2.6.10-mm1, in order to fix booting from usb-storage devices which no longer
make their partitions immediately available.

While William's patch fixed the situation where you boot from a "root=8:1"
parameter (to correspond to /dev/sda1), it does not allow you to use
"root=/dev/sda1" (which apparently worked in 2.6.9 and earlier), because
the name-->dev_t discovery is done before the "retry" loop starts, and is
not retried during the loop.

This patch, which replaces William's, solves the above problems.

Signed-off-by: Daniel Drake <dsd@gentoo.org>


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--- linux-2.6.10/init/do_mounts.c.orig	2005-01-04 12:01:37.933995432 +0000
+++ linux-2.6.10/init/do_mounts.c	2005-01-04 12:01:03.511228488 +0000
@@ -6,6 +6,7 @@
 #include <linux/suspend.h>
 #include <linux/root_dev.h>
 #include <linux/security.h>
+#include <linux/delay.h>
 
 #include <linux/nfs_fs.h>
 #include <linux/nfs_fs_sb.h>
@@ -136,10 +137,12 @@
 
 dev_t __init name_to_dev_t(char *name)
 {
-	char s[32];
+	char fullname[32], devname[32], absname[32];
 	char *p;
 	dev_t res = 0;
-	int part;
+	int part = 0;
+	int tryabs = 0;
+	int tryagain = 20;
 
 #ifdef CONFIG_SYSFS
 	int mkdir_err = sys_mkdir("/sys", 0700);
@@ -171,28 +174,54 @@
 
 	if (strlen(name) > 31)
 		goto fail;
-	strcpy(s, name);
-	for (p = s; *p; p++)
+
+	strcpy(absname, name);
+	for (p = absname; *p; p++)
 		if (*p == '/')
 			*p = '!';
-	res = try_name(s, 0);
+
+	strcpy(fullname, absname);
+
+	while (p > absname && isdigit(p[-1]))
+		p--;
+
+	if (p > absname && *p && *p != '0') {
+		part = simple_strtoul(p, NULL, 10);
+		*p = '\0';		
+	}
+
+	strcpy(devname, absname);
+
+	if (p >= absname + 2 && isdigit(p[-2]) && p[-1] == 'p') {
+		p[-1] = '\0';
+		tryabs = 1;
+	}
+
+retry:
+	res = try_name(fullname, 0);
 	if (res)
 		goto done;
 
-	while (p > s && isdigit(p[-1]))
-		p--;
-	if (p == s || !*p || *p == '0')
-		goto fail;
-	part = simple_strtoul(p, NULL, 10);
-	*p = '\0';
-	res = try_name(s, part);
+	if (!part)
+		goto next;
+	
+	res = try_name(devname, part);
 	if (res)
 		goto done;
 
-	if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
-		goto fail;
-	p[-1] = '\0';
-	res = try_name(s, part);
+	if (!tryabs)
+		goto next;
+
+	res = try_name(absname, part);
+	if (res)
+		goto done;
+
+next:
+	if (--tryagain) {
+		printk(KERN_WARNING "VFS: Root device '%s' not available, waiting %dsec\n", name, tryagain);
+		ssleep(1);
+		goto retry;
+	}
 done:
 #ifdef CONFIG_SYSFS
 	sys_umount("/sys", 0);