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Don't stat devices unless we have to.

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* grub-core/kern/emu/getroot.c (grub_find_device): Recognize
	dir == /dev/mapper.
	(grub_guess_root_device): Use already known os_dev if possible.
	* grub-core/kern/emu/hostdisk.c
	(convert_system_partition_to_system_disk): Scan only in /dev/mapper
	if device is known to be a dm one.

	Also-By: Colin Watson <cjwatson@ubuntu.com>
This commit is contained in:
Vladimir Serbinenko 2011-05-21 07:03:55 +02:00 committed by Vladimir 'phcoder' Serbinenko
parent f35fa3a664
commit f767c929f2
3 changed files with 34 additions and 14 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
2011-05-21 Colin Watson <cjwatson@ubuntu.com>
2011-05-21 Vladimir Serbinenko <phcoder@gmail.com>
Don't stat devices unless we have to.
* grub-core/kern/emu/getroot.c (grub_find_device): Recognize
dir == /dev/mapper.
(grub_guess_root_device): Use already known os_dev if possible.
* grub-core/kern/emu/hostdisk.c
(convert_system_partition_to_system_disk): Scan only in /dev/mapper
if device is known to be a dm one.
2011-05-20 Colin Watson <cjwatson@ubuntu.com>
* util/grub-mkconfig.in: Export GRUB_CMDLINE_LINUX_XEN_REPLACE and

33
grub-core/kern/emu/getroot.c
View file

@ -358,7 +358,7 @@ grub_find_device (const char *dir, dev_t dev)
if (S_ISLNK (st.st_mode)) {
#ifdef __linux__
if (strcmp (dir, "mapper") == 0) {
if (strcmp (dir, "mapper") == 0 || strcmp (dir, "/dev/mapper") == 0) {
/* Follow symbolic links under /dev/mapper/; the canonical name
may be something like /dev/dm-0, but the names under
/dev/mapper/ are more human-readable and so we prefer them if
@ -609,20 +609,27 @@ grub_guess_root_device (const char *dir)
if (os_dev)
{
if (stat (os_dev, &st) >= 0)
dev = st.st_rdev;
else
grub_util_error ("cannot stat `%s'", os_dev);
free (os_dev);
}
else
{
if (stat (dir, &st) >= 0)
dev = st.st_dev;
else
grub_util_error ("cannot stat `%s'", dir);
char *tmp = os_dev;
os_dev = canonicalize_file_name (os_dev);
free (tmp);
}
if (os_dev)
{
if (strncmp (os_dev, "/dev/dm-", sizeof ("/dev/dm-") - 1) != 0)
return os_dev;
if (stat (os_dev, &st) < 0)
grub_util_error ("cannot stat `%s'", os_dev);
free (os_dev);
dev = st.st_rdev;
return grub_find_device ("/dev/mapper", dev);
}
if (stat (dir, &st) < 0)
grub_util_error ("cannot stat `%s'", dir);
dev = st.st_dev;
#ifdef __CYGWIN__
/* Cygwin specific function. */
os_dev = grub_find_device (dir, dev);

3
grub-core/kern/emu/hostdisk.c
View file

@ -1408,7 +1408,8 @@ convert_system_partition_to_system_disk (const char *os_dev, struct stat *st)
if (tree)
dm_tree_free (tree);
free (path);
char *ret = grub_find_device (NULL, (major << 8) | minor);
char *ret = grub_find_device ("/dev/mapper",
(major << 8) | minor);
return ret;
}