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authorChristian Gmeiner <christian.gmeiner@gmail.com>2014-11-12 14:35:04 +0100
committerTom Rini <trini@ti.com>2014-11-23 06:49:01 -0500
commit59e890ef7bf5b80d96802e115255f969491ef645 (patch)
tree570d6ef6e5a64a25e3a71eaf67273f8e0b8aa013 /fs
parent1b51d32c0f0ac7cdcab0ae04d531129a020cc903 (diff)
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fs: make it possible to read the filesystem UUID
Some filesystems have a UUID stored in its superblock. To allow using root=UUID=... for the kernel command line we need a way to read-out the filesystem UUID. changes rfc -> v1: - make the environment variable an option parameter. If not given, the UUID is printed out. If given, it is stored in the env variable. - corrected typos - return error codes changes v1 -> v2: - fix return code of do_fs_uuid(..) - document do_fs_uuid(..) - implement fs_uuid_unsuported(..) be more consistent with the way other optional functionality works changes v2 -> v3: - change ext4fs_uuid(..) to make use of #if .. #else .. #endif construct to get rid of unreachable code Hit any key to stop autoboot: 0 => fsuuid fsuuid - Look up a filesystem UUID Usage: fsuuid <interface> <dev>:<part> - print filesystem UUID fsuuid <interface> <dev>:<part> <varname> - set environment variable to filesystem UUID => fsuuid mmc 0:1 d9f9fc05-45ae-4a36-a616-fccce0e4f887 => fsuuid mmc 0:2 eb3db83c-7b28-499f-95ce-9e0bb21cda81 => fsuuid mmc 0:1 uuid1 => fsuuid mmc 0:2 uuid2 => printenv uuid1 uuid1=d9f9fc05-45ae-4a36-a616-fccce0e4f887 => printenv uuid2 uuid2=eb3db83c-7b28-499f-95ce-9e0bb21cda81 => Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com> Acked-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/ext4fs.c15
-rw-r--r--fs/fs.c43
2 files changed, 58 insertions, 0 deletions
diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c
index cbdc220..87d5128 100644
--- a/fs/ext4/ext4fs.c
+++ b/fs/ext4/ext4fs.c
@@ -231,3 +231,18 @@ int ext4_read_file(const char *filename, void *buf, int offset, int len)
return len_read;
}
+
+int ext4fs_uuid(char *uuid_str)
+{
+ if (ext4fs_root == NULL)
+ return -1;
+
+#ifdef CONFIG_LIB_UUID
+ uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
+ uuid_str, UUID_STR_FORMAT_STD);
+
+ return 0;
+#else
+ return -ENOSYS;
+#endif
+}
diff --git a/fs/fs.c b/fs/fs.c
index dd680f3..e4ad6bc 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -15,6 +15,7 @@
*/
#include <config.h>
+#include <errno.h>
#include <common.h>
#include <part.h>
#include <ext4fs.h>
@@ -67,6 +68,11 @@ static inline void fs_close_unsupported(void)
{
}
+static inline int fs_uuid_unsupported(char *uuid_str)
+{
+ return -1;
+}
+
struct fstype_info {
int fstype;
/*
@@ -86,6 +92,7 @@ struct fstype_info {
int (*read)(const char *filename, void *buf, int offset, int len);
int (*write)(const char *filename, void *buf, int offset, int len);
void (*close)(void);
+ int (*uuid)(char *uuid_str);
};
static struct fstype_info fstypes[] = {
@@ -100,6 +107,7 @@ static struct fstype_info fstypes[] = {
.size = fat_size,
.read = fat_read_file,
.write = fs_write_unsupported,
+ .uuid = fs_uuid_unsupported,
},
#endif
#ifdef CONFIG_FS_EXT4
@@ -113,6 +121,7 @@ static struct fstype_info fstypes[] = {
.size = ext4fs_size,
.read = ext4_read_file,
.write = fs_write_unsupported,
+ .uuid = ext4fs_uuid,
},
#endif
#ifdef CONFIG_SANDBOX
@@ -126,6 +135,7 @@ static struct fstype_info fstypes[] = {
.size = sandbox_fs_size,
.read = fs_read_sandbox,
.write = fs_write_sandbox,
+ .uuid = fs_uuid_unsupported,
},
#endif
{
@@ -138,6 +148,7 @@ static struct fstype_info fstypes[] = {
.size = fs_size_unsupported,
.read = fs_read_unsupported,
.write = fs_write_unsupported,
+ .uuid = fs_uuid_unsupported,
},
};
@@ -206,6 +217,13 @@ static void fs_close(void)
fs_type = FS_TYPE_ANY;
}
+int fs_uuid(char *uuid_str)
+{
+ struct fstype_info *info = fs_get_info(fs_type);
+
+ return info->uuid(uuid_str);
+}
+
int fs_ls(const char *dirname)
{
int ret;
@@ -443,3 +461,28 @@ int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
return 0;
}
+
+int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
+ int fstype)
+{
+ int ret;
+ char uuid[37];
+ memset(uuid, 0, sizeof(uuid));
+
+ if (argc < 3 || argc > 4)
+ return CMD_RET_USAGE;
+
+ if (fs_set_blk_dev(argv[1], argv[2], fstype))
+ return 1;
+
+ ret = fs_uuid(uuid);
+ if (ret)
+ return CMD_RET_FAILURE;
+
+ if (argc == 4)
+ setenv(argv[3], uuid);
+ else
+ printf("%s\n", uuid);
+
+ return CMD_RET_SUCCESS;
+}