aboutsummaryrefslogtreecommitdiff
path: root/include/fs.h
blob: ef540e7c23de31d51452fcf2b96dc19770b1c52a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 */
#ifndef _FS_H
#define _FS_H

#include <rtc.h>

struct cmd_tbl;

#define FS_TYPE_ANY	0
#define FS_TYPE_FAT	1
#define FS_TYPE_EXT	2
#define FS_TYPE_SANDBOX	3
#define FS_TYPE_UBIFS	4
#define FS_TYPE_BTRFS	5
#define FS_TYPE_SQUASHFS 6
#define FS_TYPE_EROFS   7
#define FS_TYPE_SEMIHOSTING 8

struct blk_desc;

/**
 * do_fat_fsload - Run the fatload command
 *
 * @cmdtp: Command information for fatload
 * @flag: Command flags (CMD_FLAG_...)
 * @argc: Number of arguments
 * @argv: List of arguments
 * Return: result (see enum command_ret_t)
 */
int do_fat_fsload(struct cmd_tbl *cmdtp, int flag, int argc,
		  char *const argv[]);

/**
 * do_ext2load - Run the ext2load command
 *
 * @cmdtp: Command information for ext2load
 * @flag: Command flags (CMD_FLAG_...)
 * @argc: Number of arguments
 * @argv: List of arguments
 * Return: result (see enum command_ret_t)
 */
int do_ext2load(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);

/*
 * Tell the fs layer which block device and partition to use for future
 * commands. This also internally identifies the filesystem that is present
 * within the partition. The identification process may be limited to a
 * specific filesystem type by passing FS_* in the fstype parameter.
 *
 * Returns 0 on success.
 * Returns non-zero if there is an error accessing the disk or partition, or
 * no known filesystem type could be recognized on it.
 */
int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);

/**
 * fs_set_type() - Tell fs layer which filesystem type is used
 *
 * This is needed when reading from a non-block device such as sandbox. It does
 * a similar job to fs_set_blk_dev() but just sets the filesystem type instead
 * of detecting it and loading it on the block device
 *
 * @type: Filesystem type to use (FS_TYPE...)
 */
void fs_set_type(int type);

/*
 * fs_set_blk_dev_with_part - Set current block device + partition
 *
 * Similar to fs_set_blk_dev(), but useful for cases where you already
 * know the blk_desc and part number.
 *
 * Returns 0 on success.
 * Returns non-zero if invalid partition or error accessing the disk.
 */
int fs_set_blk_dev_with_part(struct blk_desc *desc, int part);

/**
 * fs_close() - Unset current block device and partition
 *
 * fs_close() closes the connection to a file system opened with either
 * fs_set_blk_dev() or fs_set_dev_with_part().
 *
 * Many file functions implicitly call fs_close(), e.g. fs_closedir(),
 * fs_exist(), fs_ln(), fs_ls(), fs_mkdir(), fs_read(), fs_size(), fs_write(),
 * fs_unlink().
 */
void fs_close(void);

/**
 * fs_get_type() - Get type of current filesystem
 *
 * Return: filesystem type
 *
 * Returns filesystem type representing the current filesystem, or
 * FS_TYPE_ANY for any unrecognised filesystem.
 */
int fs_get_type(void);

/**
 * fs_get_type_name() - Get type of current filesystem
 *
 * Return: Pointer to filesystem name
 *
 * Returns a string describing the current filesystem, or the sentinel
 * "unsupported" for any unrecognised filesystem.
 */
const char *fs_get_type_name(void);

/*
 * Print the list of files on the partition previously set by fs_set_blk_dev(),
 * in directory "dirname".
 *
 * Returns 0 on success. Returns non-zero on error.
 */
int fs_ls(const char *dirname);

/*
 * Determine whether a file exists
 *
 * Returns 1 if the file exists, 0 if it doesn't exist.
 */
int fs_exists(const char *filename);

/*
 * fs_size - Determine a file's size
 *
 * @filename: Name of the file
 * @size: Size of file
 * Return: 0 if ok with valid *size, negative on error
 */
int fs_size(const char *filename, loff_t *size);

/**
 * fs_read() - read file from the partition previously set by fs_set_blk_dev()
 *
 * Note that not all filesystem drivers support either or both of offset != 0
 * and len != 0.
 *
 * @filename:	full path of the file to read from
 * @addr:	address of the buffer to write to
 * @offset:	offset in the file from where to start reading
 * @len:	the number of bytes to read. Use 0 to read entire file.
 * @actread:	returns the actual number of bytes read
 * Return:	0 if OK with valid *actread, -1 on error conditions
 */
int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
	    loff_t *actread);

/**
 * fs_write() - write file to the partition previously set by fs_set_blk_dev()
 *
 * Note that not all filesystem drivers support offset != 0.
 *
 * @filename:	full path of the file to write to
 * @addr:	address of the buffer to read from
 * @offset:	offset in the file from where to start writing
 * @len:	the number of bytes to write
 * @actwrite:	returns the actual number of bytes written
 * Return:	0 if OK with valid *actwrite, -1 on error conditions
 */
int fs_write(const char *filename, ulong addr, loff_t offset, loff_t len,
	     loff_t *actwrite);

/*
 * Directory entry types, matches the subset of DT_x in posix readdir()
 * which apply to u-boot.
 */
#define FS_DT_DIR  4         /* directory */
#define FS_DT_REG  8         /* regular file */
#define FS_DT_LNK  10        /* symbolic link */

#define FS_DIRENT_NAME_LEN 256

/**
 * struct fs_dirent - directory entry
 *
 * A directory entry, returned by fs_readdir(). Returns information
 * about the file/directory at the current directory entry position.
 */
struct fs_dirent {
	/** @type:		one of FS_DT_x (not a mask) */
	unsigned int type;
	/** @size:		file size */
	loff_t size;
	/** @flags:		attribute flags (FS_ATTR_*) */
	u32 attr;
	/** create_time:	time of creation */
	struct rtc_time create_time;
	/** access_time:	time of last access */
	struct rtc_time access_time;
	/** change_time:	time of last modification */
	struct rtc_time change_time;
	/** name:		file name */
	char name[FS_DIRENT_NAME_LEN];
};

/* Note: fs_dir_stream should be treated as opaque to the user of fs layer */
struct fs_dir_stream {
	/* private to fs. layer: */
	struct blk_desc *desc;
	int part;
};

/*
 * fs_opendir - Open a directory
 *
 * @filename: the path to directory to open
 * Return: a pointer to the directory stream or NULL on error and errno
 *    set appropriately
 */
struct fs_dir_stream *fs_opendir(const char *filename);

/*
 * fs_readdir - Read the next directory entry in the directory stream.
 *
 * Works in an analogous way to posix readdir().  The previously returned
 * directory entry is no longer valid after calling fs_readdir() again.
 * After fs_closedir() is called, the returned directory entry is no
 * longer valid.
 *
 * @dirs: the directory stream
 * Return: the next directory entry (only valid until next fs_readdir() or
 *    fs_closedir() call, do not attempt to free()) or NULL if the end of
 *    the directory is reached.
 */
struct fs_dirent *fs_readdir(struct fs_dir_stream *dirs);

/*
 * fs_closedir - close a directory stream
 *
 * @dirs: the directory stream
 */
void fs_closedir(struct fs_dir_stream *dirs);

/*
 * fs_unlink - delete a file or directory
 *
 * If a given name is a directory, it will be deleted only if it's empty
 *
 * @filename: Name of file or directory to delete
 * Return: 0 on success, -1 on error conditions
 */
int fs_unlink(const char *filename);

/*
 * fs_mkdir - Create a directory
 *
 * @filename: Name of directory to create
 * Return: 0 on success, -1 on error conditions
 */
int fs_mkdir(const char *filename);

/*
 * Common implementation for various filesystem commands, optionally limited
 * to a specific filesystem type via the fstype parameter.
 */
int do_size(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	    int fstype);
int do_load(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	    int fstype);
int do_ls(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	  int fstype);
int file_exists(const char *dev_type, const char *dev_part, const char *file,
		int fstype);
int do_save(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	    int fstype);
int do_rm(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	  int fstype);
int do_mkdir(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	     int fstype);
int do_ln(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	  int fstype);

/*
 * Determine the UUID of the specified filesystem and print it. Optionally it is
 * possible to store the UUID directly in env.
 */
int do_fs_uuid(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
	       int fstype);

/*
 * Determine the type of the specified filesystem and print it. Optionally it is
 * possible to store the type directly in env.
 */
int do_fs_type(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);

/**
 * do_fs_types - List supported filesystems.
 *
 * @cmdtp: Command information for fstypes
 * @flag: Command flags (CMD_FLAG_...)
 * @argc: Number of arguments
 * @argv: List of arguments
 * Return: result (see enum command_ret_t)
 */
int do_fs_types(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]);

/**
 * fs_read_alloc() - Allocate space for a file and read it
 *
 * You must call fs_set_blk_dev() or a similar function before calling this,
 * since that sets up the block device to use.
 *
 * The file is terminated with a nul character
 *
 * @fname: Filename to read
 * @size: Size of file to read (must be correct!)
 * @align: Alignment to use for memory allocation (0 for default)
 * @bufp: On success, returns the allocated buffer with the nul-terminated file
 *	in it
 * Return: 0 if OK, -ENOMEM if out of memory, -EIO if read failed
 */
int fs_read_alloc(const char *fname, ulong size, uint align, void **bufp);

/**
 * fs_load_alloc() - Load a file into allocated space
 *
 * The file is terminated with a nul character
 *
 * @ifname: Interface name to read from (e.g. "mmc")
 * @dev_part_str: Device and partition string (e.g. "1:2")
 * @fname: Filename to read
 * @max_size: Maximum allowed size for the file (use 0 for 1GB)
 * @align: Alignment to use for memory allocation (0 for default)
 * @bufp: On success, returns the allocated buffer with the nul-terminated file
 *	in it
 * @sizep: On success, returns the size of the file
 * Return: 0 if OK, -ENOMEM if out of memory, -ENOENT if the file does not
 * exist, -ENOMEDIUM if the device does not exist, -E2BIG if the file is too
 * large (greater than @max_size), -EIO if read failed
 */
int fs_load_alloc(const char *ifname, const char *dev_part_str,
		  const char *fname, ulong max_size, ulong align, void **bufp,
		  ulong *sizep);

#endif /* _FS_H */