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59e890ef7b
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>
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _FS_H
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#define _FS_H
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#include <common.h>
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#define FS_TYPE_ANY 0
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#define FS_TYPE_FAT 1
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#define FS_TYPE_EXT 2
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#define FS_TYPE_SANDBOX 3
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/*
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* Tell the fs layer which block device an partition to use for future
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* commands. This also internally identifies the filesystem that is present
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* within the partition. The identification process may be limited to a
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* specific filesystem type by passing FS_* in the fstype parameter.
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*
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* Returns 0 on success.
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* Returns non-zero if there is an error accessing the disk or partition, or
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* no known filesystem type could be recognized on it.
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*/
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int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
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/*
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* Print the list of files on the partition previously set by fs_set_blk_dev(),
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* in directory "dirname".
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*
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* Returns 0 on success. Returns non-zero on error.
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*/
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int fs_ls(const char *dirname);
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/*
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* Determine whether a file exists
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*
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* Returns 1 if the file exists, 0 if it doesn't exist.
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*/
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int fs_exists(const char *filename);
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/*
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* Determine a file's size
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*
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* Returns the file's size in bytes, or a negative value if it doesn't exist.
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*/
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int fs_size(const char *filename);
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/*
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* Read file "filename" from the partition previously set by fs_set_blk_dev(),
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* to address "addr", starting at byte offset "offset", and reading "len"
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* bytes. "offset" may be 0 to read from the start of the file. "len" may be
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* 0 to read the entire file. Note that not all filesystem types support
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* either/both offset!=0 or len!=0.
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*
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* Returns number of bytes read on success. Returns <= 0 on error.
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*/
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int fs_read(const char *filename, ulong addr, int offset, int len);
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/*
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* Write file "filename" to the partition previously set by fs_set_blk_dev(),
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* from address "addr", starting at byte offset "offset", and writing "len"
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* bytes. "offset" may be 0 to write to the start of the file. Note that not
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* all filesystem types support offset!=0.
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*
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* Returns number of bytes read on success. Returns <= 0 on error.
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*/
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int fs_write(const char *filename, ulong addr, int offset, int len);
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/*
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* Common implementation for various filesystem commands, optionally limited
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* to a specific filesystem type via the fstype parameter.
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*/
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int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
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int fstype);
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int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
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int fstype);
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int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
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int fstype);
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int file_exists(const char *dev_type, const char *dev_part, const char *file,
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int fstype);
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int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
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int fstype);
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/*
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* Determine the UUID of the specified filesystem and print it. Optionally it is
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* possible to store the UUID directly in env.
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*/
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int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
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int fstype);
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#endif /* _FS_H */
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