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swaponoff: add uuid/label support. By Natanael Copa

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function                                             old     new   delta
swap_enable_disable                                  130     150     +20
resolve_mount_spec                                    76      96     +20
mount_main                                          1152    1154      +2
findfs_main                                          125      80     -45
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 42/-45)             Total: -3 bytes

Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Natanael Copa 2009-09-20 04:28:22 +02:00 committed by Denys Vlasenko
parent 2bf6634ef4
commit 9aff29997e
6 changed files with 51 additions and 33 deletions
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7
include/volume_id.h
View File

@ -21,3 +21,10 @@
char *get_devname_from_label(const char *spec);
char *get_devname_from_uuid(const char *spec);
void display_uuid_cache(void);
/* Returns:
* 0: no UUID= or LABEL= prefix found
* 1: UUID= or LABEL= prefix found. In this case,
* *fsname is replaced if device with such UUID or LABEL is found
*/
int resolve_mount_spec(char **fsname);

1
util-linux/Config.in
View File

@ -689,6 +689,7 @@ config FEATURE_MOUNT_LABEL
help
This allows for specifying a device by label or uuid, rather than by
name. This feature utilizes the same functionality as blkid/findfs.
This also enables label or uuid support for swapon.
config FEATURE_MOUNT_NFS
bool "Support mounting NFS file systems"

29
util-linux/findfs.c
View File

@ -12,26 +12,27 @@
#include "volume_id.h"
int findfs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int findfs_main(int argc, char **argv)
int findfs_main(int argc UNUSED_PARAM, char **argv)
{
char *tmp = NULL;
char *dev = *++argv;
if (argc != 2)
if (!dev)
bb_show_usage();
if (!strncmp(argv[1], "LABEL=", 6))
tmp = get_devname_from_label(argv[1] + 6);
else if (!strncmp(argv[1], "UUID=", 5))
tmp = get_devname_from_uuid(argv[1] + 5);
else if (!strncmp(argv[1], "/dev/", 5)) {
/* Just pass a device name right through. This might aid in some scripts
being able to call this unconditionally */
tmp = argv[1];
} else
if (strncmp(dev, "/dev/", 5) == 0) {
/* Just pass any /dev/xxx name right through.
* This might aid in some scripts being able
* to call this unconditionally */
dev = NULL;
} else {
/* Otherwise, handle LABEL=xxx and UUID=xxx,
* fail on anything else */
if (!resolve_mount_spec(argv))
bb_show_usage();
}
if (tmp) {
puts(tmp);
if (*argv != dev) {
puts(*argv);
return 0;
}
return 1;

19
util-linux/mount.c
View File

@ -51,6 +51,8 @@
#if ENABLE_FEATURE_MOUNT_LABEL
# include "volume_id.h"
#else
# define resolve_mount_spec(fsname) ((void)0)
#endif
// Needed for nfs support only
@ -290,23 +292,6 @@ static int verbose_mount(const char *source, const char *target,
#define verbose_mount(...) mount(__VA_ARGS__)
#endif
#if ENABLE_FEATURE_MOUNT_LABEL
static void resolve_mount_spec(char **fsname)
{
char *tmp = NULL;
if (!strncmp(*fsname, "UUID=", 5))
tmp = get_devname_from_uuid(*fsname + 5);
else if (!strncmp(*fsname, "LABEL=", 6))
tmp = get_devname_from_label(*fsname + 6);
if (tmp)
*fsname = tmp;
}
#else
#define resolve_mount_spec(fsname) ((void)0)
#endif
// Append mount options to string
static void append_mount_options(char **oldopts, const char *newopts)
{

7
util-linux/swaponoff.c
View File

@ -11,6 +11,12 @@
#include <mntent.h>
#include <sys/swap.h>
#if ENABLE_FEATURE_MOUNT_LABEL
# include "volume_id.h"
#else
# define resolve_mount_spec(fsname) ((void)0)
#endif
#if ENABLE_FEATURE_SWAPON_PRI
struct globals {
int flags;
@ -26,6 +32,7 @@ static int swap_enable_disable(char *device)
int status;
struct stat st;
resolve_mount_spec(&device);
xstat(device, &st);
#if ENABLE_DESKTOP

17
util-linux/volume_id/get_devname.c
View File

@ -260,3 +260,20 @@ char *get_devname_from_uuid(const char *spec)
}
return NULL;
}
int resolve_mount_spec(char **fsname)
{
char *tmp = *fsname;
if (strncmp(*fsname, "UUID=", 5) == 0)
tmp = get_devname_from_uuid(*fsname + 5);
else if (strncmp(*fsname, "LABEL=", 6) == 0)
tmp = get_devname_from_label(*fsname + 6);
if (tmp == *fsname)
return 0; /* no UUID= or LABEL= prefix found */
if (tmp)
*fsname = tmp;
return 1;
}