include/fs.h

   1 /*
   2  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef _FS_H
  17 #define _FS_H
  18
  19 #include <common.h>
  20
  21 #define FS_TYPE_ANY     0
  22 #define FS_TYPE_FAT     1
  23 #define FS_TYPE_EXT     2
  24 #define FS_TYPE_SANDBOX 3
  25
  26 /*
  27  * Tell the fs layer which block device an partition to use for future
  28  * commands. This also internally identifies the filesystem that is present
  29  * within the partition. The identification process may be limited to a
  30  * specific filesystem type by passing FS_* in the fstype parameter.
  31  *
  32  * Returns 0 on success.
  33  * Returns non-zero if there is an error accessing the disk or partition, or
  34  * no known filesystem type could be recognized on it.
  35  */
  36 int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
  37
  38 /*
  39  * Print the list of files on the partition previously set by fs_set_blk_dev(),
  40  * in directory "dirname".
  41  *
  42  * Returns 0 on success. Returns non-zero on error.
  43  */
  44 int fs_ls(const char *dirname);
  45
  46 /*
  47  * Determine whether a file exists
  48  *
  49  * Returns 1 if the file exists, 0 if it doesn't exist.
  50  */
  51 int fs_exists(const char *filename);
  52
  53 /*
  54  * Read file "filename" from the partition previously set by fs_set_blk_dev(),
  55  * to address "addr", starting at byte offset "offset", and reading "len"
  56  * bytes. "offset" may be 0 to read from the start of the file. "len" may be
  57  * 0 to read the entire file. Note that not all filesystem types support
  58  * either/both offset!=0 or len!=0.
  59  *
  60  * Returns number of bytes read on success. Returns <= 0 on error.
  61  */
  62 int fs_read(const char *filename, ulong addr, int offset, int len);
  63
  64 /*
  65  * Write file "filename" to the partition previously set by fs_set_blk_dev(),
  66  * from address "addr", starting at byte offset "offset", and writing "len"
  67  * bytes. "offset" may be 0 to write to the start of the file. Note that not
  68  * all filesystem types support offset!=0.
  69  *
  70  * Returns number of bytes read on success. Returns <= 0 on error.
  71  */
  72 int fs_write(const char *filename, ulong addr, int offset, int len);
  73
  74 /*
  75  * Common implementation for various filesystem commands, optionally limited
  76  * to a specific filesystem type via the fstype parameter.
  77  */
  78 int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  79                 int fstype);
  80 int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  81                 int fstype);
  82 int file_exists(const char *dev_type, const char *dev_part, const char *file,
  83                 int fstype);
  84 int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  85                 int fstype);
  86
  87 #endif /* _FS_H */