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BtrFS support. Written by me (Vladimir) with important bugfixes and

Browse source 
even more important testing by Colin.

	* Makefile.util.def (libgrubmods.a): Add crc.c and gzio.c
	* grub-core/Makefile.core.def (btrfs): Add crc.c.
	* grub-core/fs/btrfs.c: Stub replaced with real implementation.
	* grub-core/io/gzio.c (grub_gzio): New fields mem_input_size,
	mem_input_off and mem_input. All users updated to accept in-RAM input.
	(gzio_seek): New function.
	(test_zlib_header): Likewise.
	(grub_gzio_read): Likewise.
	(grub_zlib_decompress): Likewise.
	* grub-core/kern/emu/getroot.c (grub_find_root_device_from_mountinfo):
	Accept partial and non-virtual mounts.
	(grub_guess_root_device): Do rescanning after device_from_mountinfo to
	avoid receiving /dev/dm-X as device.
	* grub-core/kern/emu/misc.c (grub_make_system_path_relative_to_its_root):
	Handle bind and partial mounts.
	* grub-core/lib/crc.c: New file.
	* include/grub/deflate.h: Likewise.
	* include/grub/emu/misc.h (grub_find_root_device_from_mountinfo): New
	proto.
	* include/grub/lib/crc.h: New file.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-11 23:26:41 +02:00
commit fe6b2cbaa6
11 changed files with 1711 additions and 100 deletions
Download patch file Download diff file Expand all files Collapse all files

58
grub-core/kern/emu/getroot.c
View file

@ -105,14 +105,19 @@ xgetcwd (void)
can't deal with the multiple-device case yet, but in the meantime, we can
at least cope with the single-device case by scanning
/proc/self/mountinfo. */
static char *
find_root_device_from_mountinfo (const char *dir)
char *
grub_find_root_device_from_mountinfo (const char *dir, char **relroot)
{
FILE *fp;
char *buf = NULL;
size_t len = 0;
char *ret = NULL;
if (! *dir)
dir = "/";
if (relroot)
*relroot = NULL;
fp = fopen ("/proc/self/mountinfo", "r");
if (! fp)
return NULL; /* fall through to other methods */
@ -126,16 +131,12 @@ find_root_device_from_mountinfo (const char *dir)
size_t enc_path_len;
const char *sep;
char fstype[PATH_MAX], device[PATH_MAX];
struct stat st;
if (sscanf (buf, "%d %d %u:%u %s %s%n",
&mnt_id, &parent_mnt_id, &major, &minor, enc_root, enc_path,
&count) < 6)
continue;
if (strcmp (enc_root, "/") != 0)
continue; /* only a subtree is mounted */
enc_path_len = strlen (enc_path);
/* Check that enc_path is a prefix of dir. The prefix must either be
the entire string, or end with a slash, or be immediately followed
@ -153,9 +154,6 @@ find_root_device_from_mountinfo (const char *dir)
free (ret);
ret = NULL;
if (major != 0)
continue; /* not a virtual device */
sep = strstr (buf + count, " - ");
if (!sep)
continue;
@ -164,13 +162,9 @@ find_root_device_from_mountinfo (const char *dir)
if (sscanf (sep, "%s %s", fstype, device) != 2)
continue;
if (stat (device, &st) < 0)
continue;
if (!S_ISBLK (st.st_mode))
continue; /* not a block device */
ret = strdup (device);
if (relroot)
*relroot = strdup (enc_root);
}
free (buf);
@ -479,7 +473,7 @@ grub_find_device (const char *path, dev_t dev)
char *
grub_guess_root_device (const char *dir)
{
char *os_dev;
char *os_dev = NULL;
#ifdef __GNU__
file_t file;
mach_port_t *ports;
@ -538,30 +532,42 @@ grub_guess_root_device (const char *dir)
mach_port_deallocate (mach_task_self (), file);
#else /* !__GNU__ */
struct stat st;
dev_t dev;
#ifdef __linux__
os_dev = find_root_device_from_mountinfo (dir);
if (os_dev)
return os_dev;
if (!os_dev)
os_dev = grub_find_root_device_from_mountinfo (dir, NULL);
#endif /* __linux__ */
#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
os_dev = find_root_device_from_libzfs (dir);
if (os_dev)
return os_dev;
if (!os_dev)
os_dev = find_root_device_from_libzfs (dir);
#endif
if (stat (dir, &st) < 0)
grub_util_error ("cannot stat `%s'", 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);
}
#ifdef __CYGWIN__
/* Cygwin specific function. */
os_dev = grub_find_device (dir, st.st_dev);
os_dev = grub_find_device (dir, dev);
#else
/* This might be truly slow, but is there any better way? */
os_dev = grub_find_device ("/dev", st.st_dev);
os_dev = grub_find_device ("/dev", dev);
#endif
#endif /* !__GNU__ */

28
grub-core/kern/emu/misc.c
View file

@ -415,6 +415,18 @@ grub_make_system_path_relative_to_its_root (const char *path)
if (offset == 0)
{
free (buf);
#ifdef __linux__
{
char *bind;
grub_free (grub_find_root_device_from_mountinfo (buf2, &bind));
if (bind && bind[0] && bind[1])
{
buf3 = bind;
goto parsedir;
}
grub_free (bind);
}
#endif
free (buf2);
#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
if (poolfs)
@ -437,6 +449,21 @@ grub_make_system_path_relative_to_its_root (const char *path)
}
free (buf);
buf3 = xstrdup (buf2 + offset);
buf2[offset] = 0;
#ifdef __linux__
{
char *bind;
grub_free (grub_find_root_device_from_mountinfo (buf2, &bind));
if (bind && bind[0] && bind[1])
{
char *temp = buf3;
buf3 = grub_xasprintf ("%s%s%s", bind, buf3[0] == '/' ?"":"/", buf3);
grub_free (temp);
}
grub_free (bind);
}
#endif
free (buf2);
#ifdef __CYGWIN__
@ -452,6 +479,7 @@ grub_make_system_path_relative_to_its_root (const char *path)
}
#endif
parsedir:
/* Remove trailing slashes, return empty string if root directory. */
len = strlen (buf3);
while (len > 0 && buf3[len - 1] == '/')