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1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * (C) Copyright 2000-2004
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  */
6 
7 #ifndef BLK_H
8 #define BLK_H
9 
10 #include <efi.h>
11 
12 #ifdef CONFIG_SYS_64BIT_LBA
13 typedef uint64_t lbaint_t;
14 #define LBAFlength "ll"
15 #else
16 typedef ulong lbaint_t;
17 #define LBAFlength "l"
18 #endif
19 #define LBAF "%" LBAFlength "x"
20 #define LBAFU "%" LBAFlength "u"
21 
22 /* Interface types: */
23 enum if_type {
24 	IF_TYPE_UNKNOWN = 0,
25 	IF_TYPE_IDE,
26 	IF_TYPE_SCSI,
27 	IF_TYPE_ATAPI,
28 	IF_TYPE_USB,
29 	IF_TYPE_DOC,
30 	IF_TYPE_MMC,
31 	IF_TYPE_SD,
32 	IF_TYPE_SATA,
33 	IF_TYPE_HOST,
34 	IF_TYPE_NVME,
35 	IF_TYPE_EFI,
36 
37 	IF_TYPE_COUNT,			/* Number of interface types */
38 };
39 
40 #define BLK_VEN_SIZE		40
41 #define BLK_PRD_SIZE		20
42 #define BLK_REV_SIZE		8
43 
44 /*
45  * Identifies the partition table type (ie. MBR vs GPT GUID) signature
46  */
47 enum sig_type {
48 	SIG_TYPE_NONE,
49 	SIG_TYPE_MBR,
50 	SIG_TYPE_GUID,
51 
52 	SIG_TYPE_COUNT			/* Number of signature types */
53 };
54 
55 /*
56  * With driver model (CONFIG_BLK) this is uclass platform data, accessible
57  * with dev_get_uclass_platdata(dev)
58  */
59 struct blk_desc {
60 	/*
61 	 * TODO: With driver model we should be able to use the parent
62 	 * device's uclass instead.
63 	 */
64 	enum if_type	if_type;	/* type of the interface */
65 	int		devnum;		/* device number */
66 	unsigned char	part_type;	/* partition type */
67 	unsigned char	target;		/* target SCSI ID */
68 	unsigned char	lun;		/* target LUN */
69 	unsigned char	hwpart;		/* HW partition, e.g. for eMMC */
70 	unsigned char	type;		/* device type */
71 	unsigned char	removable;	/* removable device */
72 #ifdef CONFIG_LBA48
73 	/* device can use 48bit addr (ATA/ATAPI v7) */
74 	unsigned char	lba48;
75 #endif
76 	lbaint_t	lba;		/* number of blocks */
77 	unsigned long	blksz;		/* block size */
78 	int		log2blksz;	/* for convenience: log2(blksz) */
79 	char		vendor[BLK_VEN_SIZE + 1]; /* device vendor string */
80 	char		product[BLK_PRD_SIZE + 1]; /* device product number */
81 	char		revision[BLK_REV_SIZE + 1]; /* firmware revision */
82 	enum sig_type	sig_type;	/* Partition table signature type */
83 	union {
84 		uint32_t mbr_sig;	/* MBR integer signature */
85 		efi_guid_t guid_sig;	/* GPT GUID Signature */
86 	};
87 #if CONFIG_IS_ENABLED(BLK)
88 	/*
89 	 * For now we have a few functions which take struct blk_desc as a
90 	 * parameter. This field allows them to look up the associated
91 	 * device. Once these functions are removed we can drop this field.
92 	 */
93 	struct udevice *bdev;
94 #else
95 	unsigned long	(*block_read)(struct blk_desc *block_dev,
96 				      lbaint_t start,
97 				      lbaint_t blkcnt,
98 				      void *buffer);
99 	unsigned long	(*block_write)(struct blk_desc *block_dev,
100 				       lbaint_t start,
101 				       lbaint_t blkcnt,
102 				       const void *buffer);
103 	unsigned long	(*block_erase)(struct blk_desc *block_dev,
104 				       lbaint_t start,
105 				       lbaint_t blkcnt);
106 	void		*priv;		/* driver private struct pointer */
107 #endif
108 };
109 
110 #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz))
111 #define PAD_TO_BLOCKSIZE(size, blk_desc) \
112 	(PAD_SIZE(size, blk_desc->blksz))
113 
114 #if CONFIG_IS_ENABLED(BLOCK_CACHE)
115 /**
116  * blkcache_read() - attempt to read a set of blocks from cache
117  *
118  * @param iftype - IF_TYPE_x for type of device
119  * @param dev - device index of particular type
120  * @param start - starting block number
121  * @param blkcnt - number of blocks to read
122  * @param blksz - size in bytes of each block
123  * @param buf - buffer to contain cached data
124  *
125  * @return - '1' if block returned from cache, '0' otherwise.
126  */
127 int blkcache_read(int iftype, int dev,
128 		  lbaint_t start, lbaint_t blkcnt,
129 		  unsigned long blksz, void *buffer);
130 
131 /**
132  * blkcache_fill() - make data read from a block device available
133  * to the block cache
134  *
135  * @param iftype - IF_TYPE_x for type of device
136  * @param dev - device index of particular type
137  * @param start - starting block number
138  * @param blkcnt - number of blocks available
139  * @param blksz - size in bytes of each block
140  * @param buf - buffer containing data to cache
141  *
142  */
143 void blkcache_fill(int iftype, int dev,
144 		   lbaint_t start, lbaint_t blkcnt,
145 		   unsigned long blksz, void const *buffer);
146 
147 /**
148  * blkcache_invalidate() - discard the cache for a set of blocks
149  * because of a write or device (re)initialization.
150  *
151  * @param iftype - IF_TYPE_x for type of device
152  * @param dev - device index of particular type
153  */
154 void blkcache_invalidate(int iftype, int dev);
155 
156 /**
157  * blkcache_configure() - configure block cache
158  *
159  * @param blocks - maximum blocks per entry
160  * @param entries - maximum entries in cache
161  */
162 void blkcache_configure(unsigned blocks, unsigned entries);
163 
164 /*
165  * statistics of the block cache
166  */
167 struct block_cache_stats {
168 	unsigned hits;
169 	unsigned misses;
170 	unsigned entries; /* current entry count */
171 	unsigned max_blocks_per_entry;
172 	unsigned max_entries;
173 };
174 
175 /**
176  * get_blkcache_stats() - return statistics and reset
177  *
178  * @param stats - statistics are copied here
179  */
180 void blkcache_stats(struct block_cache_stats *stats);
181 
182 #else
183 
blkcache_read(int iftype,int dev,lbaint_t start,lbaint_t blkcnt,unsigned long blksz,void * buffer)184 static inline int blkcache_read(int iftype, int dev,
185 				lbaint_t start, lbaint_t blkcnt,
186 				unsigned long blksz, void *buffer)
187 {
188 	return 0;
189 }
190 
blkcache_fill(int iftype,int dev,lbaint_t start,lbaint_t blkcnt,unsigned long blksz,void const * buffer)191 static inline void blkcache_fill(int iftype, int dev,
192 				 lbaint_t start, lbaint_t blkcnt,
193 				 unsigned long blksz, void const *buffer) {}
194 
blkcache_invalidate(int iftype,int dev)195 static inline void blkcache_invalidate(int iftype, int dev) {}
196 
197 #endif
198 
199 #if CONFIG_IS_ENABLED(BLK)
200 struct udevice;
201 
202 /* Operations on block devices */
203 struct blk_ops {
204 	/**
205 	 * read() - read from a block device
206 	 *
207 	 * @dev:	Device to read from
208 	 * @start:	Start block number to read (0=first)
209 	 * @blkcnt:	Number of blocks to read
210 	 * @buffer:	Destination buffer for data read
211 	 * @return number of blocks read, or -ve error number (see the
212 	 * IS_ERR_VALUE() macro
213 	 */
214 	unsigned long (*read)(struct udevice *dev, lbaint_t start,
215 			      lbaint_t blkcnt, void *buffer);
216 
217 	/**
218 	 * write() - write to a block device
219 	 *
220 	 * @dev:	Device to write to
221 	 * @start:	Start block number to write (0=first)
222 	 * @blkcnt:	Number of blocks to write
223 	 * @buffer:	Source buffer for data to write
224 	 * @return number of blocks written, or -ve error number (see the
225 	 * IS_ERR_VALUE() macro
226 	 */
227 	unsigned long (*write)(struct udevice *dev, lbaint_t start,
228 			       lbaint_t blkcnt, const void *buffer);
229 
230 	/**
231 	 * erase() - erase a section of a block device
232 	 *
233 	 * @dev:	Device to (partially) erase
234 	 * @start:	Start block number to erase (0=first)
235 	 * @blkcnt:	Number of blocks to erase
236 	 * @return number of blocks erased, or -ve error number (see the
237 	 * IS_ERR_VALUE() macro
238 	 */
239 	unsigned long (*erase)(struct udevice *dev, lbaint_t start,
240 			       lbaint_t blkcnt);
241 
242 	/**
243 	 * select_hwpart() - select a particular hardware partition
244 	 *
245 	 * Some devices (e.g. MMC) can support partitioning at the hardware
246 	 * level. This is quite separate from the normal idea of
247 	 * software-based partitions. MMC hardware partitions must be
248 	 * explicitly selected. Once selected only the region of the device
249 	 * covered by that partition is accessible.
250 	 *
251 	 * The MMC standard provides for two boot partitions (numbered 1 and 2),
252 	 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
253 	 *
254 	 * @desc:	Block device to update
255 	 * @hwpart:	Hardware partition number to select. 0 means the raw
256 	 *		device, 1 is the first partition, 2 is the second, etc.
257 	 * @return 0 if OK, -ve on error
258 	 */
259 	int (*select_hwpart)(struct udevice *dev, int hwpart);
260 };
261 
262 #define blk_get_ops(dev)	((struct blk_ops *)(dev)->driver->ops)
263 
264 /*
265  * These functions should take struct udevice instead of struct blk_desc,
266  * but this is convenient for migration to driver model. Add a 'd' prefix
267  * to the function operations, so that blk_read(), etc. can be reserved for
268  * functions with the correct arguments.
269  */
270 unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start,
271 			lbaint_t blkcnt, void *buffer);
272 unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
273 			 lbaint_t blkcnt, const void *buffer);
274 unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start,
275 			 lbaint_t blkcnt);
276 
277 /**
278  * blk_find_device() - Find a block device
279  *
280  * This function does not activate the device. The device will be returned
281  * whether or not it is activated.
282  *
283  * @if_type:	Interface type (enum if_type_t)
284  * @devnum:	Device number (specific to each interface type)
285  * @devp:	the device, if found
286  * @return 0 if found, -ENODEV if no device found, or other -ve error value
287  */
288 int blk_find_device(int if_type, int devnum, struct udevice **devp);
289 
290 /**
291  * blk_get_device() - Find and probe a block device ready for use
292  *
293  * @if_type:	Interface type (enum if_type_t)
294  * @devnum:	Device number (specific to each interface type)
295  * @devp:	the device, if found
296  * @return 0 if found, -ENODEV if no device found, or other -ve error value
297  */
298 int blk_get_device(int if_type, int devnum, struct udevice **devp);
299 
300 /**
301  * blk_first_device() - Find the first device for a given interface
302  *
303  * The device is probed ready for use
304  *
305  * @devnum:	Device number (specific to each interface type)
306  * @devp:	the device, if found
307  * @return 0 if found, -ENODEV if no device, or other -ve error value
308  */
309 int blk_first_device(int if_type, struct udevice **devp);
310 
311 /**
312  * blk_next_device() - Find the next device for a given interface
313  *
314  * This can be called repeatedly after blk_first_device() to iterate through
315  * all devices of the given interface type.
316  *
317  * The device is probed ready for use
318  *
319  * @devp:	On entry, the previous device returned. On exit, the next
320  *		device, if found
321  * @return 0 if found, -ENODEV if no device, or other -ve error value
322  */
323 int blk_next_device(struct udevice **devp);
324 
325 /**
326  * blk_create_device() - Create a new block device
327  *
328  * @parent:	Parent of the new device
329  * @drv_name:	Driver name to use for the block device
330  * @name:	Name for the device
331  * @if_type:	Interface type (enum if_type_t)
332  * @devnum:	Device number, specific to the interface type, or -1 to
333  *		allocate the next available number
334  * @blksz:	Block size of the device in bytes (typically 512)
335  * @lba:	Total number of blocks of the device
336  * @devp:	the new device (which has not been probed)
337  */
338 int blk_create_device(struct udevice *parent, const char *drv_name,
339 		      const char *name, int if_type, int devnum, int blksz,
340 		      lbaint_t lba, struct udevice **devp);
341 
342 /**
343  * blk_create_devicef() - Create a new named block device
344  *
345  * @parent:	Parent of the new device
346  * @drv_name:	Driver name to use for the block device
347  * @name:	Name for the device (parent name is prepended)
348  * @if_type:	Interface type (enum if_type_t)
349  * @devnum:	Device number, specific to the interface type, or -1 to
350  *		allocate the next available number
351  * @blksz:	Block size of the device in bytes (typically 512)
352  * @lba:	Total number of blocks of the device
353  * @devp:	the new device (which has not been probed)
354  */
355 int blk_create_devicef(struct udevice *parent, const char *drv_name,
356 		       const char *name, int if_type, int devnum, int blksz,
357 		       lbaint_t lba, struct udevice **devp);
358 
359 /**
360  * blk_prepare_device() - Prepare a block device for use
361  *
362  * This reads partition information from the device if supported.
363  *
364  * @dev:	Device to prepare
365  * @return 0 if ok, -ve on error
366  */
367 int blk_prepare_device(struct udevice *dev);
368 
369 /**
370  * blk_unbind_all() - Unbind all device of the given interface type
371  *
372  * The devices are removed and then unbound.
373  *
374  * @if_type:	Interface type to unbind
375  * @return 0 if OK, -ve on error
376  */
377 int blk_unbind_all(int if_type);
378 
379 /**
380  * blk_find_max_devnum() - find the maximum device number for an interface type
381  *
382  * Finds the last allocated device number for an interface type @if_type. The
383  * next number is safe to use for a newly allocated device.
384  *
385  * @if_type:	Interface type to scan
386  * @return maximum device number found, or -ENODEV if none, or other -ve on
387  * error
388  */
389 int blk_find_max_devnum(enum if_type if_type);
390 
391 /**
392  * blk_select_hwpart() - select a hardware partition
393  *
394  * Select a hardware partition if the device supports it (typically MMC does)
395  *
396  * @dev:	Device to update
397  * @hwpart:	Partition number to select
398  * @return 0 if OK, -ve on error
399  */
400 int blk_select_hwpart(struct udevice *dev, int hwpart);
401 
402 /**
403  * blk_get_from_parent() - obtain a block device by looking up its parent
404  *
405  * All devices with
406  */
407 int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
408 
409 #else
410 #include <errno.h>
411 /*
412  * These functions should take struct udevice instead of struct blk_desc,
413  * but this is convenient for migration to driver model. Add a 'd' prefix
414  * to the function operations, so that blk_read(), etc. can be reserved for
415  * functions with the correct arguments.
416  */
blk_dread(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt,void * buffer)417 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start,
418 			      lbaint_t blkcnt, void *buffer)
419 {
420 	ulong blks_read;
421 	if (blkcache_read(block_dev->if_type, block_dev->devnum,
422 			  start, blkcnt, block_dev->blksz, buffer))
423 		return blkcnt;
424 
425 	/*
426 	 * We could check if block_read is NULL and return -ENOSYS. But this
427 	 * bloats the code slightly (cause some board to fail to build), and
428 	 * it would be an error to try an operation that does not exist.
429 	 */
430 	blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer);
431 	if (blks_read == blkcnt)
432 		blkcache_fill(block_dev->if_type, block_dev->devnum,
433 			      start, blkcnt, block_dev->blksz, buffer);
434 
435 	return blks_read;
436 }
437 
blk_dwrite(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt,const void * buffer)438 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
439 			       lbaint_t blkcnt, const void *buffer)
440 {
441 	blkcache_invalidate(block_dev->if_type, block_dev->devnum);
442 	return block_dev->block_write(block_dev, start, blkcnt, buffer);
443 }
444 
blk_derase(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt)445 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
446 			       lbaint_t blkcnt)
447 {
448 	blkcache_invalidate(block_dev->if_type, block_dev->devnum);
449 	return block_dev->block_erase(block_dev, start, blkcnt);
450 }
451 
452 /**
453  * struct blk_driver - Driver for block interface types
454  *
455  * This provides access to the block devices for each interface type. One
456  * driver should be provided using U_BOOT_LEGACY_BLK() for each interface
457  * type that is to be supported.
458  *
459  * @if_typename:	Interface type name
460  * @if_type:		Interface type
461  * @max_devs:		Maximum number of devices supported
462  * @desc:		Pointer to list of devices for this interface type,
463  *			or NULL to use @get_dev() instead
464  */
465 struct blk_driver {
466 	const char *if_typename;
467 	enum if_type if_type;
468 	int max_devs;
469 	struct blk_desc *desc;
470 	/**
471 	 * get_dev() - get a pointer to a block device given its number
472 	 *
473 	 * Each interface allocates its own devices and typically
474 	 * struct blk_desc is contained with the interface's data structure.
475 	 * There is no global numbering for block devices. This method allows
476 	 * the device for an interface type to be obtained when @desc is NULL.
477 	 *
478 	 * @devnum:	Device number (0 for first device on that interface,
479 	 *		1 for second, etc.
480 	 * @descp:	Returns pointer to the block device on success
481 	 * @return 0 if OK, -ve on error
482 	 */
483 	int (*get_dev)(int devnum, struct blk_desc **descp);
484 
485 	/**
486 	 * select_hwpart() - Select a hardware partition
487 	 *
488 	 * Some devices (e.g. MMC) can support partitioning at the hardware
489 	 * level. This is quite separate from the normal idea of
490 	 * software-based partitions. MMC hardware partitions must be
491 	 * explicitly selected. Once selected only the region of the device
492 	 * covered by that partition is accessible.
493 	 *
494 	 * The MMC standard provides for two boot partitions (numbered 1 and 2),
495 	 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
496 	 * Partition 0 is the main user-data partition.
497 	 *
498 	 * @desc:	Block device descriptor
499 	 * @hwpart:	Hardware partition number to select. 0 means the main
500 	 *		user-data partition, 1 is the first partition, 2 is
501 	 *		the second, etc.
502 	 * @return 0 if OK, other value for an error
503 	 */
504 	int (*select_hwpart)(struct blk_desc *desc, int hwpart);
505 };
506 
507 /*
508  * Declare a new U-Boot legacy block driver. New drivers should use driver
509  * model (UCLASS_BLK).
510  */
511 #define U_BOOT_LEGACY_BLK(__name)					\
512 	ll_entry_declare(struct blk_driver, __name, blk_driver)
513 
514 struct blk_driver *blk_driver_lookup_type(int if_type);
515 
516 #endif /* !CONFIG_BLK */
517 
518 /**
519  * blk_get_devnum_by_typename() - Get a block device by type and number
520  *
521  * This looks through the available block devices of the given type, returning
522  * the one with the given @devnum.
523  *
524  * @if_type:	Block device type
525  * @devnum:	Device number
526  * @return point to block device descriptor, or NULL if not found
527  */
528 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum);
529 
530 /**
531  * blk_get_devnum_by_type() - Get a block device by type name, and number
532  *
533  * This looks up the block device type based on @if_typename, then calls
534  * blk_get_devnum_by_type().
535  *
536  * @if_typename:	Block device type name
537  * @devnum:		Device number
538  * @return point to block device descriptor, or NULL if not found
539  */
540 struct blk_desc *blk_get_devnum_by_typename(const char *if_typename,
541 					    int devnum);
542 
543 /**
544  * blk_dselect_hwpart() - select a hardware partition
545  *
546  * This selects a hardware partition (such as is supported by MMC). The block
547  * device size may change as this effectively points the block device to a
548  * partition at the hardware level. See the select_hwpart() method above.
549  *
550  * @desc:	Block device descriptor for the device to select
551  * @hwpart:	Partition number to select
552  * @return 0 if OK, -ve on error
553  */
554 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart);
555 
556 /**
557  * blk_list_part() - list the partitions for block devices of a given type
558  *
559  * This looks up the partition type for each block device of type @if_type,
560  * then displays a list of partitions.
561  *
562  * @if_type:	Block device type
563  * @return 0 if OK, -ENODEV if there is none of that type
564  */
565 int blk_list_part(enum if_type if_type);
566 
567 /**
568  * blk_list_devices() - list the block devices of a given type
569  *
570  * This lists each block device of the type @if_type, showing the capacity
571  * as well as type-specific information.
572  *
573  * @if_type:	Block device type
574  */
575 void blk_list_devices(enum if_type if_type);
576 
577 /**
578  * blk_show_device() - show information about a given block device
579  *
580  * This shows the block device capacity as well as type-specific information.
581  *
582  * @if_type:	Block device type
583  * @devnum:	Device number
584  * @return 0 if OK, -ENODEV for invalid device number
585  */
586 int blk_show_device(enum if_type if_type, int devnum);
587 
588 /**
589  * blk_print_device_num() - show information about a given block device
590  *
591  * This is similar to blk_show_device() but returns an error if the block
592  * device type is unknown.
593  *
594  * @if_type:	Block device type
595  * @devnum:	Device number
596  * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block
597  * device is not connected
598  */
599 int blk_print_device_num(enum if_type if_type, int devnum);
600 
601 /**
602  * blk_print_part_devnum() - print the partition information for a device
603  *
604  * @if_type:	Block device type
605  * @devnum:	Device number
606  * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if
607  * the interface type is not supported, other -ve on other error
608  */
609 int blk_print_part_devnum(enum if_type if_type, int devnum);
610 
611 /**
612  * blk_read_devnum() - read blocks from a device
613  *
614  * @if_type:	Block device type
615  * @devnum:	Device number
616  * @blkcnt:	Number of blocks to read
617  * @buffer:	Address to write data to
618  * @return number of blocks read, or -ve error number on error
619  */
620 ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
621 		      lbaint_t blkcnt, void *buffer);
622 
623 /**
624  * blk_write_devnum() - write blocks to a device
625  *
626  * @if_type:	Block device type
627  * @devnum:	Device number
628  * @blkcnt:	Number of blocks to write
629  * @buffer:	Address to read data from
630  * @return number of blocks written, or -ve error number on error
631  */
632 ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
633 		       lbaint_t blkcnt, const void *buffer);
634 
635 /**
636  * blk_select_hwpart_devnum() - select a hardware partition
637  *
638  * This is similar to blk_dselect_hwpart() but it looks up the interface and
639  * device number.
640  *
641  * @if_type:	Block device type
642  * @devnum:	Device number
643  * @hwpart:	Partition number to select
644  * @return 0 if OK, -ve on error
645  */
646 int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart);
647 
648 /**
649  * blk_get_if_type_name() - Get the name of an interface type
650  *
651  * @if_type: Interface type to check
652  * @return name of interface, or NULL if none
653  */
654 const char *blk_get_if_type_name(enum if_type if_type);
655 
656 /**
657  * blk_common_cmd() - handle common commands with block devices
658  *
659  * @args: Number of arguments to the command (argv[0] is the command itself)
660  * @argv: Command arguments
661  * @if_type: Interface type
662  * @cur_devnump: Current device number for this interface type
663  * @return 0 if OK, CMD_RET_ERROR on error
664  */
665 int blk_common_cmd(int argc, char * const argv[], enum if_type if_type,
666 		   int *cur_devnump);
667 
668 #endif
669