2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 #include "yaffs_trace.h"
17 #include "yaffs_guts.h"
18 #include "yaffs_getblockinfo.h"
19 #include "yaffs_tagscompat.h"
20 #include "yaffs_tagsmarshall.h"
21 #include "yaffs_nand.h"
22 #include "yaffs_yaffs1.h"
23 #include "yaffs_yaffs2.h"
24 #include "yaffs_bitmap.h"
25 #include "yaffs_verify.h"
26 #include "yaffs_nand.h"
27 #include "yaffs_packedtags2.h"
28 #include "yaffs_nameval.h"
29 #include "yaffs_allocator.h"
30 #include "yaffs_attribs.h"
31 #include "yaffs_summary.h"
33 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
34 #define YAFFS_GC_GOOD_ENOUGH 2
35 #define YAFFS_GC_PASSIVE_THRESHOLD 4
37 #include "yaffs_ecc.h"
39 /* Forward declarations */
41 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
42 const u8
*buffer
, int n_bytes
, int use_reserve
);
44 static void yaffs_fix_null_name(struct yaffs_obj
*obj
, YCHAR
*name
,
47 /* Function to calculate chunk and offset */
49 void yaffs_addr_to_chunk(struct yaffs_dev
*dev
, loff_t addr
,
50 int *chunk_out
, u32
*offset_out
)
55 chunk
= (u32
) (addr
>> dev
->chunk_shift
);
57 if (dev
->chunk_div
== 1) {
58 /* easy power of 2 case */
59 offset
= (u32
) (addr
& dev
->chunk_mask
);
61 /* Non power-of-2 case */
65 chunk
/= dev
->chunk_div
;
67 chunk_base
= ((loff_t
) chunk
) * dev
->data_bytes_per_chunk
;
68 offset
= (u32
) (addr
- chunk_base
);
75 /* Function to return the number of shifts for a power of 2 greater than or
76 * equal to the given number
77 * Note we don't try to cater for all possible numbers and this does not have to
78 * be hellishly efficient.
81 static inline u32
calc_shifts_ceiling(u32 x
)
86 shifts
= extra_bits
= 0;
101 /* Function to return the number of shifts to get a 1 in bit 0
104 static inline u32
calc_shifts(u32 x
)
122 * Temporary buffer manipulations.
125 static int yaffs_init_tmp_buffers(struct yaffs_dev
*dev
)
130 memset(dev
->temp_buffer
, 0, sizeof(dev
->temp_buffer
));
132 for (i
= 0; buf
&& i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
133 dev
->temp_buffer
[i
].in_use
= 0;
134 buf
= kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
135 dev
->temp_buffer
[i
].buffer
= buf
;
138 return buf
? YAFFS_OK
: YAFFS_FAIL
;
141 u8
*yaffs_get_temp_buffer(struct yaffs_dev
* dev
)
146 if (dev
->temp_in_use
> dev
->max_temp
)
147 dev
->max_temp
= dev
->temp_in_use
;
149 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
150 if (dev
->temp_buffer
[i
].in_use
== 0) {
151 dev
->temp_buffer
[i
].in_use
= 1;
152 return dev
->temp_buffer
[i
].buffer
;
156 yaffs_trace(YAFFS_TRACE_BUFFERS
, "Out of temp buffers");
158 * If we got here then we have to allocate an unmanaged one
162 dev
->unmanaged_buffer_allocs
++;
163 return kmalloc(dev
->data_bytes_per_chunk
, GFP_NOFS
);
167 void yaffs_release_temp_buffer(struct yaffs_dev
*dev
, u8
*buffer
)
173 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
174 if (dev
->temp_buffer
[i
].buffer
== buffer
) {
175 dev
->temp_buffer
[i
].in_use
= 0;
181 /* assume it is an unmanaged one. */
182 yaffs_trace(YAFFS_TRACE_BUFFERS
,
183 "Releasing unmanaged temp buffer");
185 dev
->unmanaged_buffer_deallocs
++;
191 * Functions for robustisizing TODO
195 static void yaffs_handle_chunk_wr_ok(struct yaffs_dev
*dev
, int nand_chunk
,
197 const struct yaffs_ext_tags
*tags
)
205 static void yaffs_handle_chunk_update(struct yaffs_dev
*dev
, int nand_chunk
,
206 const struct yaffs_ext_tags
*tags
)
213 void yaffs_handle_chunk_error(struct yaffs_dev
*dev
,
214 struct yaffs_block_info
*bi
)
216 if (!bi
->gc_prioritise
) {
217 bi
->gc_prioritise
= 1;
218 dev
->has_pending_prioritised_gc
= 1;
219 bi
->chunk_error_strikes
++;
221 if (bi
->chunk_error_strikes
> 3) {
222 bi
->needs_retiring
= 1; /* Too many stikes, so retire */
223 yaffs_trace(YAFFS_TRACE_ALWAYS
,
224 "yaffs: Block struck out");
230 static void yaffs_handle_chunk_wr_error(struct yaffs_dev
*dev
, int nand_chunk
,
233 int flash_block
= nand_chunk
/ dev
->param
.chunks_per_block
;
234 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
236 yaffs_handle_chunk_error(dev
, bi
);
239 /* Was an actual write failure,
240 * so mark the block for retirement.*/
241 bi
->needs_retiring
= 1;
242 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
243 "**>> Block %d needs retiring", flash_block
);
246 /* Delete the chunk */
247 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
248 yaffs_skip_rest_of_block(dev
);
256 * Simple hash function. Needs to have a reasonable spread
259 static inline int yaffs_hash_fn(int n
)
263 return n
% YAFFS_NOBJECT_BUCKETS
;
267 * Access functions to useful fake objects.
268 * Note that root might have a presence in NAND if permissions are set.
271 struct yaffs_obj
*yaffs_root(struct yaffs_dev
*dev
)
273 return dev
->root_dir
;
276 struct yaffs_obj
*yaffs_lost_n_found(struct yaffs_dev
*dev
)
278 return dev
->lost_n_found
;
282 * Erased NAND checking functions
285 int yaffs_check_ff(u8
*buffer
, int n_bytes
)
287 /* Horrible, slow implementation */
296 static int yaffs_check_chunk_erased(struct yaffs_dev
*dev
, int nand_chunk
)
298 int retval
= YAFFS_OK
;
299 u8
*data
= yaffs_get_temp_buffer(dev
);
300 struct yaffs_ext_tags tags
;
303 result
= yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, data
, &tags
);
305 if (tags
.ecc_result
> YAFFS_ECC_RESULT_NO_ERROR
)
308 if (!yaffs_check_ff(data
, dev
->data_bytes_per_chunk
) ||
310 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
311 "Chunk %d not erased", nand_chunk
);
315 yaffs_release_temp_buffer(dev
, data
);
321 static int yaffs_verify_chunk_written(struct yaffs_dev
*dev
,
324 struct yaffs_ext_tags
*tags
)
326 int retval
= YAFFS_OK
;
327 struct yaffs_ext_tags temp_tags
;
328 u8
*buffer
= yaffs_get_temp_buffer(dev
);
331 result
= yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, buffer
, &temp_tags
);
332 if (memcmp(buffer
, data
, dev
->data_bytes_per_chunk
) ||
333 temp_tags
.obj_id
!= tags
->obj_id
||
334 temp_tags
.chunk_id
!= tags
->chunk_id
||
335 temp_tags
.n_bytes
!= tags
->n_bytes
)
338 yaffs_release_temp_buffer(dev
, buffer
);
344 int yaffs_check_alloc_available(struct yaffs_dev
*dev
, int n_chunks
)
347 int reserved_blocks
= dev
->param
.n_reserved_blocks
;
350 checkpt_blocks
= yaffs_calc_checkpt_blocks_required(dev
);
353 (reserved_blocks
+ checkpt_blocks
) * dev
->param
.chunks_per_block
;
355 return (dev
->n_free_chunks
> (reserved_chunks
+ n_chunks
));
358 static int yaffs_find_alloc_block(struct yaffs_dev
*dev
)
361 struct yaffs_block_info
*bi
;
363 if (dev
->n_erased_blocks
< 1) {
364 /* Hoosterman we've got a problem.
365 * Can't get space to gc
367 yaffs_trace(YAFFS_TRACE_ERROR
,
368 "yaffs tragedy: no more erased blocks");
373 /* Find an empty block. */
375 for (i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
376 dev
->alloc_block_finder
++;
377 if (dev
->alloc_block_finder
< dev
->internal_start_block
378 || dev
->alloc_block_finder
> dev
->internal_end_block
) {
379 dev
->alloc_block_finder
= dev
->internal_start_block
;
382 bi
= yaffs_get_block_info(dev
, dev
->alloc_block_finder
);
384 if (bi
->block_state
== YAFFS_BLOCK_STATE_EMPTY
) {
385 bi
->block_state
= YAFFS_BLOCK_STATE_ALLOCATING
;
387 bi
->seq_number
= dev
->seq_number
;
388 dev
->n_erased_blocks
--;
389 yaffs_trace(YAFFS_TRACE_ALLOCATE
,
390 "Allocated block %d, seq %d, %d left" ,
391 dev
->alloc_block_finder
, dev
->seq_number
,
392 dev
->n_erased_blocks
);
393 return dev
->alloc_block_finder
;
397 yaffs_trace(YAFFS_TRACE_ALWAYS
,
398 "yaffs tragedy: no more erased blocks, but there should have been %d",
399 dev
->n_erased_blocks
);
404 static int yaffs_alloc_chunk(struct yaffs_dev
*dev
, int use_reserver
,
405 struct yaffs_block_info
**block_ptr
)
408 struct yaffs_block_info
*bi
;
410 if (dev
->alloc_block
< 0) {
411 /* Get next block to allocate off */
412 dev
->alloc_block
= yaffs_find_alloc_block(dev
);
416 if (!use_reserver
&& !yaffs_check_alloc_available(dev
, 1)) {
417 /* No space unless we're allowed to use the reserve. */
421 if (dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
422 && dev
->alloc_page
== 0)
423 yaffs_trace(YAFFS_TRACE_ALLOCATE
, "Allocating reserve");
425 /* Next page please.... */
426 if (dev
->alloc_block
>= 0) {
427 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
429 ret_val
= (dev
->alloc_block
* dev
->param
.chunks_per_block
) +
432 yaffs_set_chunk_bit(dev
, dev
->alloc_block
, dev
->alloc_page
);
436 dev
->n_free_chunks
--;
438 /* If the block is full set the state to full */
439 if (dev
->alloc_page
>= dev
->param
.chunks_per_block
) {
440 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
441 dev
->alloc_block
= -1;
450 yaffs_trace(YAFFS_TRACE_ERROR
,
451 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
456 static int yaffs_get_erased_chunks(struct yaffs_dev
*dev
)
460 n
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
462 if (dev
->alloc_block
> 0)
463 n
+= (dev
->param
.chunks_per_block
- dev
->alloc_page
);
470 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
471 * if we don't want to write to it.
473 void yaffs_skip_rest_of_block(struct yaffs_dev
*dev
)
475 struct yaffs_block_info
*bi
;
477 if (dev
->alloc_block
> 0) {
478 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
479 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
) {
480 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
481 dev
->alloc_block
= -1;
486 static int yaffs_write_new_chunk(struct yaffs_dev
*dev
,
488 struct yaffs_ext_tags
*tags
, int use_reserver
)
494 yaffs2_checkpt_invalidate(dev
);
497 struct yaffs_block_info
*bi
= 0;
500 chunk
= yaffs_alloc_chunk(dev
, use_reserver
, &bi
);
506 /* First check this chunk is erased, if it needs
507 * checking. The checking policy (unless forced
508 * always on) is as follows:
510 * Check the first page we try to write in a block.
511 * If the check passes then we don't need to check any
512 * more. If the check fails, we check again...
513 * If the block has been erased, we don't need to check.
515 * However, if the block has been prioritised for gc,
516 * then we think there might be something odd about
517 * this block and stop using it.
519 * Rationale: We should only ever see chunks that have
520 * not been erased if there was a partially written
521 * chunk due to power loss. This checking policy should
522 * catch that case with very few checks and thus save a
523 * lot of checks that are most likely not needed.
526 * If an erase check fails or the write fails we skip the
530 /* let's give it a try */
533 if (dev
->param
.always_check_erased
)
534 bi
->skip_erased_check
= 0;
536 if (!bi
->skip_erased_check
) {
537 erased_ok
= yaffs_check_chunk_erased(dev
, chunk
);
538 if (erased_ok
!= YAFFS_OK
) {
539 yaffs_trace(YAFFS_TRACE_ERROR
,
540 "**>> yaffs chunk %d was not erased",
543 /* If not erased, delete this one,
544 * skip rest of block and
545 * try another chunk */
546 yaffs_chunk_del(dev
, chunk
, 1, __LINE__
);
547 yaffs_skip_rest_of_block(dev
);
552 write_ok
= yaffs_wr_chunk_tags_nand(dev
, chunk
, data
, tags
);
554 if (!bi
->skip_erased_check
)
556 yaffs_verify_chunk_written(dev
, chunk
, data
, tags
);
558 if (write_ok
!= YAFFS_OK
) {
559 /* Clean up aborted write, skip to next block and
560 * try another chunk */
561 yaffs_handle_chunk_wr_error(dev
, chunk
, erased_ok
);
565 bi
->skip_erased_check
= 1;
567 /* Copy the data into the robustification buffer */
568 yaffs_handle_chunk_wr_ok(dev
, chunk
, data
, tags
);
570 } while (write_ok
!= YAFFS_OK
&&
571 (yaffs_wr_attempts
<= 0 || attempts
<= yaffs_wr_attempts
));
577 yaffs_trace(YAFFS_TRACE_ERROR
,
578 "**>> yaffs write required %d attempts",
580 dev
->n_retried_writes
+= (attempts
- 1);
587 * Block retiring for handling a broken block.
590 static void yaffs_retire_block(struct yaffs_dev
*dev
, int flash_block
)
592 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
594 yaffs2_checkpt_invalidate(dev
);
596 yaffs2_clear_oldest_dirty_seq(dev
, bi
);
598 if (yaffs_mark_bad(dev
, flash_block
) != YAFFS_OK
) {
599 if (yaffs_erase_block(dev
, flash_block
) != YAFFS_OK
) {
600 yaffs_trace(YAFFS_TRACE_ALWAYS
,
601 "yaffs: Failed to mark bad and erase block %d",
604 struct yaffs_ext_tags tags
;
606 flash_block
* dev
->param
.chunks_per_block
;
608 u8
*buffer
= yaffs_get_temp_buffer(dev
);
610 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
611 memset(&tags
, 0, sizeof(tags
));
612 tags
.seq_number
= YAFFS_SEQUENCE_BAD_BLOCK
;
613 if (dev
->tagger
.write_chunk_tags_fn(dev
, chunk_id
-
617 yaffs_trace(YAFFS_TRACE_ALWAYS
,
618 "yaffs: Failed to write bad block marker to block %d",
621 yaffs_release_temp_buffer(dev
, buffer
);
625 bi
->block_state
= YAFFS_BLOCK_STATE_DEAD
;
626 bi
->gc_prioritise
= 0;
627 bi
->needs_retiring
= 0;
629 dev
->n_retired_blocks
++;
632 /*---------------- Name handling functions ------------*/
634 static void yaffs_load_name_from_oh(struct yaffs_dev
*dev
, YCHAR
*name
,
635 const YCHAR
*oh_name
, int buff_size
)
637 #ifdef CONFIG_YAFFS_AUTO_UNICODE
638 if (dev
->param
.auto_unicode
) {
640 /* It is an ASCII name, do an ASCII to
641 * unicode conversion */
642 const char *ascii_oh_name
= (const char *)oh_name
;
643 int n
= buff_size
- 1;
644 while (n
> 0 && *ascii_oh_name
) {
645 *name
= *ascii_oh_name
;
651 strncpy(name
, oh_name
+ 1, buff_size
- 1);
658 strncpy(name
, oh_name
, buff_size
- 1);
662 static void yaffs_load_oh_from_name(struct yaffs_dev
*dev
, YCHAR
*oh_name
,
665 #ifdef CONFIG_YAFFS_AUTO_UNICODE
670 if (dev
->param
.auto_unicode
) {
675 /* Figure out if the name will fit in ascii character set */
676 while (is_ascii
&& *w
) {
683 /* It is an ASCII name, so convert unicode to ascii */
684 char *ascii_oh_name
= (char *)oh_name
;
685 int n
= YAFFS_MAX_NAME_LENGTH
- 1;
686 while (n
> 0 && *name
) {
687 *ascii_oh_name
= *name
;
693 /* Unicode name, so save starting at the second YCHAR */
695 strncpy(oh_name
+ 1, name
, YAFFS_MAX_NAME_LENGTH
- 2);
702 strncpy(oh_name
, name
, YAFFS_MAX_NAME_LENGTH
- 1);
706 static u16
yaffs_calc_name_sum(const YCHAR
*name
)
714 while ((*name
) && i
< (YAFFS_MAX_NAME_LENGTH
/ 2)) {
716 /* 0x1f mask is case insensitive */
717 sum
+= ((*name
) & 0x1f) * i
;
725 void yaffs_set_obj_name(struct yaffs_obj
*obj
, const YCHAR
* name
)
727 memset(obj
->short_name
, 0, sizeof(obj
->short_name
));
729 if (name
&& !name
[0]) {
730 yaffs_fix_null_name(obj
, obj
->short_name
,
731 YAFFS_SHORT_NAME_LENGTH
);
732 name
= obj
->short_name
;
734 strnlen(name
, YAFFS_SHORT_NAME_LENGTH
+ 1) <=
735 YAFFS_SHORT_NAME_LENGTH
) {
736 strcpy(obj
->short_name
, name
);
739 obj
->sum
= yaffs_calc_name_sum(name
);
742 void yaffs_set_obj_name_from_oh(struct yaffs_obj
*obj
,
743 const struct yaffs_obj_hdr
*oh
)
745 #ifdef CONFIG_YAFFS_AUTO_UNICODE
746 YCHAR tmp_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
747 memset(tmp_name
, 0, sizeof(tmp_name
));
748 yaffs_load_name_from_oh(obj
->my_dev
, tmp_name
, oh
->name
,
749 YAFFS_MAX_NAME_LENGTH
+ 1);
750 yaffs_set_obj_name(obj
, tmp_name
);
752 yaffs_set_obj_name(obj
, oh
->name
);
756 loff_t
yaffs_max_file_size(struct yaffs_dev
*dev
)
758 if(sizeof(loff_t
) < 8)
759 return YAFFS_MAX_FILE_SIZE_32
;
761 return ((loff_t
) YAFFS_MAX_CHUNK_ID
) * dev
->data_bytes_per_chunk
;
764 /*-------------------- TNODES -------------------
766 * List of spare tnodes
767 * The list is hooked together using the first pointer
771 struct yaffs_tnode
*yaffs_get_tnode(struct yaffs_dev
*dev
)
773 struct yaffs_tnode
*tn
= yaffs_alloc_raw_tnode(dev
);
776 memset(tn
, 0, dev
->tnode_size
);
780 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
785 /* FreeTnode frees up a tnode and puts it back on the free list */
786 static void yaffs_free_tnode(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
)
788 yaffs_free_raw_tnode(dev
, tn
);
790 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
793 static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev
*dev
)
795 yaffs_deinit_raw_tnodes_and_objs(dev
);
800 static void yaffs_load_tnode_0(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
801 unsigned pos
, unsigned val
)
803 u32
*map
= (u32
*) tn
;
809 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
810 val
>>= dev
->chunk_grp_bits
;
812 bit_in_map
= pos
* dev
->tnode_width
;
813 word_in_map
= bit_in_map
/ 32;
814 bit_in_word
= bit_in_map
& (32 - 1);
816 mask
= dev
->tnode_mask
<< bit_in_word
;
818 map
[word_in_map
] &= ~mask
;
819 map
[word_in_map
] |= (mask
& (val
<< bit_in_word
));
821 if (dev
->tnode_width
> (32 - bit_in_word
)) {
822 bit_in_word
= (32 - bit_in_word
);
825 dev
->tnode_mask
>> bit_in_word
;
826 map
[word_in_map
] &= ~mask
;
827 map
[word_in_map
] |= (mask
& (val
>> bit_in_word
));
831 u32
yaffs_get_group_base(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
834 u32
*map
= (u32
*) tn
;
840 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
842 bit_in_map
= pos
* dev
->tnode_width
;
843 word_in_map
= bit_in_map
/ 32;
844 bit_in_word
= bit_in_map
& (32 - 1);
846 val
= map
[word_in_map
] >> bit_in_word
;
848 if (dev
->tnode_width
> (32 - bit_in_word
)) {
849 bit_in_word
= (32 - bit_in_word
);
851 val
|= (map
[word_in_map
] << bit_in_word
);
854 val
&= dev
->tnode_mask
;
855 val
<<= dev
->chunk_grp_bits
;
860 /* ------------------- End of individual tnode manipulation -----------------*/
862 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
863 * The look up tree is represented by the top tnode and the number of top_level
864 * in the tree. 0 means only the level 0 tnode is in the tree.
867 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
868 struct yaffs_tnode
*yaffs_find_tnode_0(struct yaffs_dev
*dev
,
869 struct yaffs_file_var
*file_struct
,
872 struct yaffs_tnode
*tn
= file_struct
->top
;
875 int level
= file_struct
->top_level
;
879 /* Check sane level and chunk Id */
880 if (level
< 0 || level
> YAFFS_TNODES_MAX_LEVEL
)
883 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
886 /* First check we're tall enough (ie enough top_level) */
888 i
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
891 i
>>= YAFFS_TNODES_INTERNAL_BITS
;
895 if (required_depth
> file_struct
->top_level
)
896 return NULL
; /* Not tall enough, so we can't find it */
898 /* Traverse down to level 0 */
899 while (level
> 0 && tn
) {
900 tn
= tn
->internal
[(chunk_id
>>
901 (YAFFS_TNODES_LEVEL0_BITS
+
903 YAFFS_TNODES_INTERNAL_BITS
)) &
904 YAFFS_TNODES_INTERNAL_MASK
];
911 /* add_find_tnode_0 finds the level 0 tnode if it exists,
912 * otherwise first expands the tree.
913 * This happens in two steps:
914 * 1. If the tree isn't tall enough, then make it taller.
915 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
917 * Used when modifying the tree.
919 * If the tn argument is NULL, then a fresh tnode will be added otherwise the
920 * specified tn will be plugged into the ttree.
923 struct yaffs_tnode
*yaffs_add_find_tnode_0(struct yaffs_dev
*dev
,
924 struct yaffs_file_var
*file_struct
,
926 struct yaffs_tnode
*passed_tn
)
931 struct yaffs_tnode
*tn
;
934 /* Check sane level and page Id */
935 if (file_struct
->top_level
< 0 ||
936 file_struct
->top_level
> YAFFS_TNODES_MAX_LEVEL
)
939 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
942 /* First check we're tall enough (ie enough top_level) */
944 x
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
947 x
>>= YAFFS_TNODES_INTERNAL_BITS
;
951 if (required_depth
> file_struct
->top_level
) {
952 /* Not tall enough, gotta make the tree taller */
953 for (i
= file_struct
->top_level
; i
< required_depth
; i
++) {
955 tn
= yaffs_get_tnode(dev
);
958 tn
->internal
[0] = file_struct
->top
;
959 file_struct
->top
= tn
;
960 file_struct
->top_level
++;
962 yaffs_trace(YAFFS_TRACE_ERROR
,
963 "yaffs: no more tnodes");
969 /* Traverse down to level 0, adding anything we need */
971 l
= file_struct
->top_level
;
972 tn
= file_struct
->top
;
975 while (l
> 0 && tn
) {
977 (YAFFS_TNODES_LEVEL0_BITS
+
978 (l
- 1) * YAFFS_TNODES_INTERNAL_BITS
)) &
979 YAFFS_TNODES_INTERNAL_MASK
;
981 if ((l
> 1) && !tn
->internal
[x
]) {
982 /* Add missing non-level-zero tnode */
983 tn
->internal
[x
] = yaffs_get_tnode(dev
);
984 if (!tn
->internal
[x
])
987 /* Looking from level 1 at level 0 */
989 /* If we already have one, release it */
991 yaffs_free_tnode(dev
,
993 tn
->internal
[x
] = passed_tn
;
995 } else if (!tn
->internal
[x
]) {
996 /* Don't have one, none passed in */
997 tn
->internal
[x
] = yaffs_get_tnode(dev
);
998 if (!tn
->internal
[x
])
1003 tn
= tn
->internal
[x
];
1007 /* top is level 0 */
1009 memcpy(tn
, passed_tn
,
1010 (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8);
1011 yaffs_free_tnode(dev
, passed_tn
);
1018 static int yaffs_tags_match(const struct yaffs_ext_tags
*tags
, int obj_id
,
1021 return (tags
->chunk_id
== chunk_obj
&&
1022 tags
->obj_id
== obj_id
&&
1023 !tags
->is_deleted
) ? 1 : 0;
1027 static int yaffs_find_chunk_in_group(struct yaffs_dev
*dev
, int the_chunk
,
1028 struct yaffs_ext_tags
*tags
, int obj_id
,
1033 for (j
= 0; the_chunk
&& j
< dev
->chunk_grp_size
; j
++) {
1034 if (yaffs_check_chunk_bit
1035 (dev
, the_chunk
/ dev
->param
.chunks_per_block
,
1036 the_chunk
% dev
->param
.chunks_per_block
)) {
1038 if (dev
->chunk_grp_size
== 1)
1041 yaffs_rd_chunk_tags_nand(dev
, the_chunk
, NULL
,
1043 if (yaffs_tags_match(tags
,
1044 obj_id
, inode_chunk
)) {
1055 int yaffs_find_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
1056 struct yaffs_ext_tags
*tags
)
1058 /*Get the Tnode, then get the level 0 offset chunk offset */
1059 struct yaffs_tnode
*tn
;
1061 struct yaffs_ext_tags local_tags
;
1063 struct yaffs_dev
*dev
= in
->my_dev
;
1066 /* Passed a NULL, so use our own tags space */
1070 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1075 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1077 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1082 static int yaffs_find_del_file_chunk(struct yaffs_obj
*in
, int inode_chunk
,
1083 struct yaffs_ext_tags
*tags
)
1085 /* Get the Tnode, then get the level 0 offset chunk offset */
1086 struct yaffs_tnode
*tn
;
1088 struct yaffs_ext_tags local_tags
;
1089 struct yaffs_dev
*dev
= in
->my_dev
;
1093 /* Passed a NULL, so use our own tags space */
1097 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1102 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1104 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1107 /* Delete the entry in the filestructure (if found) */
1109 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, 0);
1114 int yaffs_put_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
1115 int nand_chunk
, int in_scan
)
1117 /* NB in_scan is zero unless scanning.
1118 * For forward scanning, in_scan is > 0;
1119 * for backward scanning in_scan is < 0
1121 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1124 struct yaffs_tnode
*tn
;
1125 struct yaffs_dev
*dev
= in
->my_dev
;
1127 struct yaffs_ext_tags existing_tags
;
1128 struct yaffs_ext_tags new_tags
;
1129 unsigned existing_serial
, new_serial
;
1131 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
) {
1132 /* Just ignore an attempt at putting a chunk into a non-file
1134 * If it is not during Scanning then something went wrong!
1137 yaffs_trace(YAFFS_TRACE_ERROR
,
1138 "yaffs tragedy:attempt to put data chunk into a non-file"
1143 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1147 tn
= yaffs_add_find_tnode_0(dev
,
1148 &in
->variant
.file_variant
,
1154 /* Dummy insert, bail now */
1157 existing_cunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1160 /* If we're scanning then we need to test for duplicates
1161 * NB This does not need to be efficient since it should only
1162 * happen when the power fails during a write, then only one
1163 * chunk should ever be affected.
1165 * Correction for YAFFS2: This could happen quite a lot and we
1166 * need to think about efficiency! TODO
1167 * Update: For backward scanning we don't need to re-read tags
1168 * so this is quite cheap.
1171 if (existing_cunk
> 0) {
1172 /* NB Right now existing chunk will not be real
1173 * chunk_id if the chunk group size > 1
1174 * thus we have to do a FindChunkInFile to get the
1177 * We have a duplicate now we need to decide which
1180 * Backwards scanning YAFFS2: The old one is what
1181 * we use, dump the new one.
1182 * YAFFS1: Get both sets of tags and compare serial
1187 /* Only do this for forward scanning */
1188 yaffs_rd_chunk_tags_nand(dev
,
1192 /* Do a proper find */
1194 yaffs_find_chunk_in_file(in
, inode_chunk
,
1198 if (existing_cunk
<= 0) {
1199 /*Hoosterman - how did this happen? */
1201 yaffs_trace(YAFFS_TRACE_ERROR
,
1202 "yaffs tragedy: existing chunk < 0 in scan"
1207 /* NB The deleted flags should be false, otherwise
1208 * the chunks will not be loaded during a scan
1212 new_serial
= new_tags
.serial_number
;
1213 existing_serial
= existing_tags
.serial_number
;
1216 if ((in_scan
> 0) &&
1217 (existing_cunk
<= 0 ||
1218 ((existing_serial
+ 1) & 3) == new_serial
)) {
1219 /* Forward scanning.
1221 * Delete the old one and drop through to
1224 yaffs_chunk_del(dev
, existing_cunk
, 1,
1227 /* Backward scanning or we want to use the
1229 * Delete the new one and return early so that
1230 * the tnode isn't changed
1232 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1239 if (existing_cunk
== 0)
1240 in
->n_data_chunks
++;
1242 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, nand_chunk
);
1247 static void yaffs_soft_del_chunk(struct yaffs_dev
*dev
, int chunk
)
1249 struct yaffs_block_info
*the_block
;
1252 yaffs_trace(YAFFS_TRACE_DELETION
, "soft delete chunk %d", chunk
);
1254 block_no
= chunk
/ dev
->param
.chunks_per_block
;
1255 the_block
= yaffs_get_block_info(dev
, block_no
);
1257 the_block
->soft_del_pages
++;
1258 dev
->n_free_chunks
++;
1259 yaffs2_update_oldest_dirty_seq(dev
, block_no
, the_block
);
1263 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1264 * the chunks in the file.
1265 * All soft deleting does is increment the block's softdelete count and pulls
1266 * the chunk out of the tnode.
1267 * Thus, essentially this is the same as DeleteWorker except that the chunks
1271 static int yaffs_soft_del_worker(struct yaffs_obj
*in
, struct yaffs_tnode
*tn
,
1272 u32 level
, int chunk_offset
)
1277 struct yaffs_dev
*dev
= in
->my_dev
;
1283 for (i
= YAFFS_NTNODES_INTERNAL
- 1;
1286 if (tn
->internal
[i
]) {
1288 yaffs_soft_del_worker(in
,
1292 YAFFS_TNODES_INTERNAL_BITS
)
1295 yaffs_free_tnode(dev
,
1297 tn
->internal
[i
] = NULL
;
1299 /* Can this happen? */
1303 return (all_done
) ? 1 : 0;
1307 for (i
= YAFFS_NTNODES_LEVEL0
- 1; i
>= 0; i
--) {
1308 the_chunk
= yaffs_get_group_base(dev
, tn
, i
);
1310 yaffs_soft_del_chunk(dev
, the_chunk
);
1311 yaffs_load_tnode_0(dev
, tn
, i
, 0);
1317 static void yaffs_remove_obj_from_dir(struct yaffs_obj
*obj
)
1319 struct yaffs_dev
*dev
= obj
->my_dev
;
1320 struct yaffs_obj
*parent
;
1322 yaffs_verify_obj_in_dir(obj
);
1323 parent
= obj
->parent
;
1325 yaffs_verify_dir(parent
);
1327 if (dev
&& dev
->param
.remove_obj_fn
)
1328 dev
->param
.remove_obj_fn(obj
);
1330 list_del_init(&obj
->siblings
);
1333 yaffs_verify_dir(parent
);
1336 void yaffs_add_obj_to_dir(struct yaffs_obj
*directory
, struct yaffs_obj
*obj
)
1339 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1340 "tragedy: Trying to add an object to a null pointer directory"
1345 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1346 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1347 "tragedy: Trying to add an object to a non-directory"
1352 if (obj
->siblings
.prev
== NULL
) {
1353 /* Not initialised */
1357 yaffs_verify_dir(directory
);
1359 yaffs_remove_obj_from_dir(obj
);
1362 list_add(&obj
->siblings
, &directory
->variant
.dir_variant
.children
);
1363 obj
->parent
= directory
;
1365 if (directory
== obj
->my_dev
->unlinked_dir
1366 || directory
== obj
->my_dev
->del_dir
) {
1368 obj
->my_dev
->n_unlinked_files
++;
1369 obj
->rename_allowed
= 0;
1372 yaffs_verify_dir(directory
);
1373 yaffs_verify_obj_in_dir(obj
);
1376 static int yaffs_change_obj_name(struct yaffs_obj
*obj
,
1377 struct yaffs_obj
*new_dir
,
1378 const YCHAR
*new_name
, int force
, int shadows
)
1382 struct yaffs_obj
*existing_target
;
1384 if (new_dir
== NULL
)
1385 new_dir
= obj
->parent
; /* use the old directory */
1387 if (new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1388 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1389 "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1394 unlink_op
= (new_dir
== obj
->my_dev
->unlinked_dir
);
1395 del_op
= (new_dir
== obj
->my_dev
->del_dir
);
1397 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
1399 /* If the object is a file going into the unlinked directory,
1400 * then it is OK to just stuff it in since duplicate names are OK.
1401 * else only proceed if the new name does not exist and we're putting
1402 * it into a directory.
1404 if (!(unlink_op
|| del_op
|| force
||
1405 shadows
> 0 || !existing_target
) ||
1406 new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
1409 yaffs_set_obj_name(obj
, new_name
);
1411 yaffs_add_obj_to_dir(new_dir
, obj
);
1416 /* If it is a deletion then we mark it as a shrink for gc */
1417 if (yaffs_update_oh(obj
, new_name
, 0, del_op
, shadows
, NULL
) >= 0)
1423 /*------------------------ Short Operations Cache ------------------------------
1424 * In many situations where there is no high level buffering a lot of
1425 * reads might be short sequential reads, and a lot of writes may be short
1426 * sequential writes. eg. scanning/writing a jpeg file.
1427 * In these cases, a short read/write cache can provide a huge perfomance
1428 * benefit with dumb-as-a-rock code.
1429 * In Linux, the page cache provides read buffering and the short op cache
1430 * provides write buffering.
1432 * There are a small number (~10) of cache chunks per device so that we don't
1433 * need a very intelligent search.
1436 static int yaffs_obj_cache_dirty(struct yaffs_obj
*obj
)
1438 struct yaffs_dev
*dev
= obj
->my_dev
;
1440 struct yaffs_cache
*cache
;
1441 int n_caches
= obj
->my_dev
->param
.n_caches
;
1443 for (i
= 0; i
< n_caches
; i
++) {
1444 cache
= &dev
->cache
[i
];
1445 if (cache
->object
== obj
&& cache
->dirty
)
1452 static void yaffs_flush_single_cache(struct yaffs_cache
*cache
, int discard
)
1455 if (!cache
|| cache
->locked
)
1458 /* Write it out and free it up if need be.*/
1460 yaffs_wr_data_obj(cache
->object
,
1470 cache
->object
= NULL
;
1473 static void yaffs_flush_file_cache(struct yaffs_obj
*obj
, int discard
)
1475 struct yaffs_dev
*dev
= obj
->my_dev
;
1477 struct yaffs_cache
*cache
;
1478 int n_caches
= obj
->my_dev
->param
.n_caches
;
1484 /* Find the chunks for this object and flush them. */
1485 for (i
= 0; i
< n_caches
; i
++) {
1486 cache
= &dev
->cache
[i
];
1487 if (cache
->object
== obj
)
1488 yaffs_flush_single_cache(cache
, discard
);
1494 void yaffs_flush_whole_cache(struct yaffs_dev
*dev
, int discard
)
1496 struct yaffs_obj
*obj
;
1497 int n_caches
= dev
->param
.n_caches
;
1500 /* Find a dirty object in the cache and flush it...
1501 * until there are no further dirty objects.
1505 for (i
= 0; i
< n_caches
&& !obj
; i
++) {
1506 if (dev
->cache
[i
].object
&& dev
->cache
[i
].dirty
)
1507 obj
= dev
->cache
[i
].object
;
1510 yaffs_flush_file_cache(obj
, discard
);
1515 /* Grab us an unused cache chunk for use.
1516 * First look for an empty one.
1517 * Then look for the least recently used non-dirty one.
1518 * Then look for the least recently used dirty one...., flush and look again.
1520 static struct yaffs_cache
*yaffs_grab_chunk_worker(struct yaffs_dev
*dev
)
1524 if (dev
->param
.n_caches
> 0) {
1525 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1526 if (!dev
->cache
[i
].object
)
1527 return &dev
->cache
[i
];
1534 static struct yaffs_cache
*yaffs_grab_chunk_cache(struct yaffs_dev
*dev
)
1536 struct yaffs_cache
*cache
;
1540 if (dev
->param
.n_caches
< 1)
1543 /* First look for an unused cache */
1545 cache
= yaffs_grab_chunk_worker(dev
);
1551 * Thery were all in use.
1552 * Find the LRU cache and flush it if it is dirty.
1558 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1559 if (dev
->cache
[i
].object
&&
1560 !dev
->cache
[i
].locked
&&
1561 (dev
->cache
[i
].last_use
< usage
|| !cache
)) {
1562 usage
= dev
->cache
[i
].last_use
;
1563 cache
= &dev
->cache
[i
];
1568 yaffs_flush_single_cache(cache
, 1);
1570 yaffs_flush_file_cache(cache
->object
, 1);
1571 cache
= yaffs_grab_chunk_worker(dev
);
1577 /* Find a cached chunk */
1578 static struct yaffs_cache
*yaffs_find_chunk_cache(const struct yaffs_obj
*obj
,
1581 struct yaffs_dev
*dev
= obj
->my_dev
;
1584 if (dev
->param
.n_caches
< 1)
1587 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1588 if (dev
->cache
[i
].object
== obj
&&
1589 dev
->cache
[i
].chunk_id
== chunk_id
) {
1592 return &dev
->cache
[i
];
1598 /* Mark the chunk for the least recently used algorithym */
1599 static void yaffs_use_cache(struct yaffs_dev
*dev
, struct yaffs_cache
*cache
,
1604 if (dev
->param
.n_caches
< 1)
1607 if (dev
->cache_last_use
< 0 ||
1608 dev
->cache_last_use
> 100000000) {
1609 /* Reset the cache usages */
1610 for (i
= 1; i
< dev
->param
.n_caches
; i
++)
1611 dev
->cache
[i
].last_use
= 0;
1613 dev
->cache_last_use
= 0;
1615 dev
->cache_last_use
++;
1616 cache
->last_use
= dev
->cache_last_use
;
1622 /* Invalidate a single cache page.
1623 * Do this when a whole page gets written,
1624 * ie the short cache for this page is no longer valid.
1626 static void yaffs_invalidate_chunk_cache(struct yaffs_obj
*object
, int chunk_id
)
1628 struct yaffs_cache
*cache
;
1630 if (object
->my_dev
->param
.n_caches
> 0) {
1631 cache
= yaffs_find_chunk_cache(object
, chunk_id
);
1634 cache
->object
= NULL
;
1638 /* Invalidate all the cache pages associated with this object
1639 * Do this whenever ther file is deleted or resized.
1641 static void yaffs_invalidate_whole_cache(struct yaffs_obj
*in
)
1644 struct yaffs_dev
*dev
= in
->my_dev
;
1646 if (dev
->param
.n_caches
> 0) {
1647 /* Invalidate it. */
1648 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1649 if (dev
->cache
[i
].object
== in
)
1650 dev
->cache
[i
].object
= NULL
;
1655 static void yaffs_unhash_obj(struct yaffs_obj
*obj
)
1658 struct yaffs_dev
*dev
= obj
->my_dev
;
1660 /* If it is still linked into the bucket list, free from the list */
1661 if (!list_empty(&obj
->hash_link
)) {
1662 list_del_init(&obj
->hash_link
);
1663 bucket
= yaffs_hash_fn(obj
->obj_id
);
1664 dev
->obj_bucket
[bucket
].count
--;
1668 /* FreeObject frees up a Object and puts it back on the free list */
1669 static void yaffs_free_obj(struct yaffs_obj
*obj
)
1671 struct yaffs_dev
*dev
;
1678 yaffs_trace(YAFFS_TRACE_OS
, "FreeObject %p inode %p",
1679 obj
, obj
->my_inode
);
1682 if (!list_empty(&obj
->siblings
))
1685 if (obj
->my_inode
) {
1686 /* We're still hooked up to a cached inode.
1687 * Don't delete now, but mark for later deletion
1689 obj
->defered_free
= 1;
1693 yaffs_unhash_obj(obj
);
1695 yaffs_free_raw_obj(dev
, obj
);
1697 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
1700 void yaffs_handle_defered_free(struct yaffs_obj
*obj
)
1702 if (obj
->defered_free
)
1703 yaffs_free_obj(obj
);
1706 static int yaffs_generic_obj_del(struct yaffs_obj
*in
)
1708 /* Iinvalidate the file's data in the cache, without flushing. */
1709 yaffs_invalidate_whole_cache(in
);
1711 if (in
->my_dev
->param
.is_yaffs2
&& in
->parent
!= in
->my_dev
->del_dir
) {
1712 /* Move to unlinked directory so we have a deletion record */
1713 yaffs_change_obj_name(in
, in
->my_dev
->del_dir
, _Y("deleted"), 0,
1717 yaffs_remove_obj_from_dir(in
);
1718 yaffs_chunk_del(in
->my_dev
, in
->hdr_chunk
, 1, __LINE__
);
1726 static void yaffs_soft_del_file(struct yaffs_obj
*obj
)
1728 if (!obj
->deleted
||
1729 obj
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
||
1733 if (obj
->n_data_chunks
<= 0) {
1734 /* Empty file with no duplicate object headers,
1735 * just delete it immediately */
1736 yaffs_free_tnode(obj
->my_dev
, obj
->variant
.file_variant
.top
);
1737 obj
->variant
.file_variant
.top
= NULL
;
1738 yaffs_trace(YAFFS_TRACE_TRACING
,
1739 "yaffs: Deleting empty file %d",
1741 yaffs_generic_obj_del(obj
);
1743 yaffs_soft_del_worker(obj
,
1744 obj
->variant
.file_variant
.top
,
1746 file_variant
.top_level
, 0);
1751 /* Pruning removes any part of the file structure tree that is beyond the
1752 * bounds of the file (ie that does not point to chunks).
1754 * A file should only get pruned when its size is reduced.
1756 * Before pruning, the chunks must be pulled from the tree and the
1757 * level 0 tnode entries must be zeroed out.
1758 * Could also use this for file deletion, but that's probably better handled
1759 * by a special case.
1761 * This function is recursive. For levels > 0 the function is called again on
1762 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1763 * If there is no data in a subtree then it is pruned.
1766 static struct yaffs_tnode
*yaffs_prune_worker(struct yaffs_dev
*dev
,
1767 struct yaffs_tnode
*tn
, u32 level
,
1779 for (i
= 0; i
< YAFFS_NTNODES_INTERNAL
; i
++) {
1780 if (tn
->internal
[i
]) {
1782 yaffs_prune_worker(dev
,
1785 (i
== 0) ? del0
: 1);
1788 if (tn
->internal
[i
])
1792 int tnode_size_u32
= dev
->tnode_size
/ sizeof(u32
);
1793 u32
*map
= (u32
*) tn
;
1795 for (i
= 0; !has_data
&& i
< tnode_size_u32
; i
++) {
1801 if (has_data
== 0 && del0
) {
1802 /* Free and return NULL */
1803 yaffs_free_tnode(dev
, tn
);
1809 static int yaffs_prune_tree(struct yaffs_dev
*dev
,
1810 struct yaffs_file_var
*file_struct
)
1815 struct yaffs_tnode
*tn
;
1817 if (file_struct
->top_level
< 1)
1821 yaffs_prune_worker(dev
, file_struct
->top
, file_struct
->top_level
, 0);
1823 /* Now we have a tree with all the non-zero branches NULL but
1824 * the height is the same as it was.
1825 * Let's see if we can trim internal tnodes to shorten the tree.
1826 * We can do this if only the 0th element in the tnode is in use
1827 * (ie all the non-zero are NULL)
1830 while (file_struct
->top_level
&& !done
) {
1831 tn
= file_struct
->top
;
1834 for (i
= 1; i
< YAFFS_NTNODES_INTERNAL
; i
++) {
1835 if (tn
->internal
[i
])
1840 file_struct
->top
= tn
->internal
[0];
1841 file_struct
->top_level
--;
1842 yaffs_free_tnode(dev
, tn
);
1851 /*-------------------- End of File Structure functions.-------------------*/
1853 /* alloc_empty_obj gets us a clean Object.*/
1854 static struct yaffs_obj
*yaffs_alloc_empty_obj(struct yaffs_dev
*dev
)
1856 struct yaffs_obj
*obj
= yaffs_alloc_raw_obj(dev
);
1863 /* Now sweeten it up... */
1865 memset(obj
, 0, sizeof(struct yaffs_obj
));
1866 obj
->being_created
= 1;
1870 obj
->variant_type
= YAFFS_OBJECT_TYPE_UNKNOWN
;
1871 INIT_LIST_HEAD(&(obj
->hard_links
));
1872 INIT_LIST_HEAD(&(obj
->hash_link
));
1873 INIT_LIST_HEAD(&obj
->siblings
);
1875 /* Now make the directory sane */
1876 if (dev
->root_dir
) {
1877 obj
->parent
= dev
->root_dir
;
1878 list_add(&(obj
->siblings
),
1879 &dev
->root_dir
->variant
.dir_variant
.children
);
1882 /* Add it to the lost and found directory.
1883 * NB Can't put root or lost-n-found in lost-n-found so
1884 * check if lost-n-found exists first
1886 if (dev
->lost_n_found
)
1887 yaffs_add_obj_to_dir(dev
->lost_n_found
, obj
);
1889 obj
->being_created
= 0;
1891 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
1896 static int yaffs_find_nice_bucket(struct yaffs_dev
*dev
)
1900 int lowest
= 999999;
1902 /* Search for the shortest list or one that
1906 for (i
= 0; i
< 10 && lowest
> 4; i
++) {
1907 dev
->bucket_finder
++;
1908 dev
->bucket_finder
%= YAFFS_NOBJECT_BUCKETS
;
1909 if (dev
->obj_bucket
[dev
->bucket_finder
].count
< lowest
) {
1910 lowest
= dev
->obj_bucket
[dev
->bucket_finder
].count
;
1911 l
= dev
->bucket_finder
;
1918 static int yaffs_new_obj_id(struct yaffs_dev
*dev
)
1920 int bucket
= yaffs_find_nice_bucket(dev
);
1922 struct list_head
*i
;
1923 u32 n
= (u32
) bucket
;
1926 * Now find an object value that has not already been taken
1927 * by scanning the list, incrementing each time by number of buckets.
1931 n
+= YAFFS_NOBJECT_BUCKETS
;
1932 list_for_each(i
, &dev
->obj_bucket
[bucket
].list
) {
1933 /* Check if this value is already taken. */
1934 if (i
&& list_entry(i
, struct yaffs_obj
,
1935 hash_link
)->obj_id
== n
)
1942 static void yaffs_hash_obj(struct yaffs_obj
*in
)
1944 int bucket
= yaffs_hash_fn(in
->obj_id
);
1945 struct yaffs_dev
*dev
= in
->my_dev
;
1947 list_add(&in
->hash_link
, &dev
->obj_bucket
[bucket
].list
);
1948 dev
->obj_bucket
[bucket
].count
++;
1951 struct yaffs_obj
*yaffs_find_by_number(struct yaffs_dev
*dev
, u32 number
)
1953 int bucket
= yaffs_hash_fn(number
);
1954 struct list_head
*i
;
1955 struct yaffs_obj
*in
;
1957 list_for_each(i
, &dev
->obj_bucket
[bucket
].list
) {
1958 /* Look if it is in the list */
1959 in
= list_entry(i
, struct yaffs_obj
, hash_link
);
1960 if (in
->obj_id
== number
) {
1961 /* Don't show if it is defered free */
1962 if (in
->defered_free
)
1971 static struct yaffs_obj
*yaffs_new_obj(struct yaffs_dev
*dev
, int number
,
1972 enum yaffs_obj_type type
)
1974 struct yaffs_obj
*the_obj
= NULL
;
1975 struct yaffs_tnode
*tn
= NULL
;
1978 number
= yaffs_new_obj_id(dev
);
1980 if (type
== YAFFS_OBJECT_TYPE_FILE
) {
1981 tn
= yaffs_get_tnode(dev
);
1986 the_obj
= yaffs_alloc_empty_obj(dev
);
1989 yaffs_free_tnode(dev
, tn
);
1994 the_obj
->rename_allowed
= 1;
1995 the_obj
->unlink_allowed
= 1;
1996 the_obj
->obj_id
= number
;
1997 yaffs_hash_obj(the_obj
);
1998 the_obj
->variant_type
= type
;
1999 yaffs_load_current_time(the_obj
, 1, 1);
2002 case YAFFS_OBJECT_TYPE_FILE
:
2003 the_obj
->variant
.file_variant
.file_size
= 0;
2004 the_obj
->variant
.file_variant
.scanned_size
= 0;
2005 the_obj
->variant
.file_variant
.shrink_size
=
2006 yaffs_max_file_size(dev
);
2007 the_obj
->variant
.file_variant
.top_level
= 0;
2008 the_obj
->variant
.file_variant
.top
= tn
;
2010 case YAFFS_OBJECT_TYPE_DIRECTORY
:
2011 INIT_LIST_HEAD(&the_obj
->variant
.dir_variant
.children
);
2012 INIT_LIST_HEAD(&the_obj
->variant
.dir_variant
.dirty
);
2014 case YAFFS_OBJECT_TYPE_SYMLINK
:
2015 case YAFFS_OBJECT_TYPE_HARDLINK
:
2016 case YAFFS_OBJECT_TYPE_SPECIAL
:
2017 /* No action required */
2019 case YAFFS_OBJECT_TYPE_UNKNOWN
:
2020 /* todo this should not happen */
2026 static struct yaffs_obj
*yaffs_create_fake_dir(struct yaffs_dev
*dev
,
2027 int number
, u32 mode
)
2030 struct yaffs_obj
*obj
=
2031 yaffs_new_obj(dev
, number
, YAFFS_OBJECT_TYPE_DIRECTORY
);
2036 obj
->fake
= 1; /* it is fake so it might not use NAND */
2037 obj
->rename_allowed
= 0;
2038 obj
->unlink_allowed
= 0;
2041 obj
->yst_mode
= mode
;
2043 obj
->hdr_chunk
= 0; /* Not a valid chunk. */
2049 static void yaffs_init_tnodes_and_objs(struct yaffs_dev
*dev
)
2055 yaffs_init_raw_tnodes_and_objs(dev
);
2057 for (i
= 0; i
< YAFFS_NOBJECT_BUCKETS
; i
++) {
2058 INIT_LIST_HEAD(&dev
->obj_bucket
[i
].list
);
2059 dev
->obj_bucket
[i
].count
= 0;
2063 struct yaffs_obj
*yaffs_find_or_create_by_number(struct yaffs_dev
*dev
,
2065 enum yaffs_obj_type type
)
2067 struct yaffs_obj
*the_obj
= NULL
;
2070 the_obj
= yaffs_find_by_number(dev
, number
);
2073 the_obj
= yaffs_new_obj(dev
, number
, type
);
2079 YCHAR
*yaffs_clone_str(const YCHAR
*str
)
2081 YCHAR
*new_str
= NULL
;
2087 len
= strnlen(str
, YAFFS_MAX_ALIAS_LENGTH
);
2088 new_str
= kmalloc((len
+ 1) * sizeof(YCHAR
), GFP_NOFS
);
2090 strncpy(new_str
, str
, len
);
2097 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2098 * link (ie. name) is created or deleted in the directory.
2101 * create dir/a : update dir's mtime/ctime
2102 * rm dir/a: update dir's mtime/ctime
2103 * modify dir/a: don't update dir's mtimme/ctime
2105 * This can be handled immediately or defered. Defering helps reduce the number
2106 * of updates when many files in a directory are changed within a brief period.
2108 * If the directory updating is defered then yaffs_update_dirty_dirs must be
2109 * called periodically.
2112 static void yaffs_update_parent(struct yaffs_obj
*obj
)
2114 struct yaffs_dev
*dev
;
2120 yaffs_load_current_time(obj
, 0, 1);
2121 if (dev
->param
.defered_dir_update
) {
2122 struct list_head
*link
= &obj
->variant
.dir_variant
.dirty
;
2124 if (list_empty(link
)) {
2125 list_add(link
, &dev
->dirty_dirs
);
2126 yaffs_trace(YAFFS_TRACE_BACKGROUND
,
2127 "Added object %d to dirty directories",
2132 yaffs_update_oh(obj
, NULL
, 0, 0, 0, NULL
);
2136 void yaffs_update_dirty_dirs(struct yaffs_dev
*dev
)
2138 struct list_head
*link
;
2139 struct yaffs_obj
*obj
;
2140 struct yaffs_dir_var
*d_s
;
2141 union yaffs_obj_var
*o_v
;
2143 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Update dirty directories");
2145 while (!list_empty(&dev
->dirty_dirs
)) {
2146 link
= dev
->dirty_dirs
.next
;
2147 list_del_init(link
);
2149 d_s
= list_entry(link
, struct yaffs_dir_var
, dirty
);
2150 o_v
= list_entry(d_s
, union yaffs_obj_var
, dir_variant
);
2151 obj
= list_entry(o_v
, struct yaffs_obj
, variant
);
2153 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Update directory %d",
2157 yaffs_update_oh(obj
, NULL
, 0, 0, 0, NULL
);
2162 * Mknod (create) a new object.
2163 * equiv_obj only has meaning for a hard link;
2164 * alias_str only has meaning for a symlink.
2165 * rdev only has meaning for devices (a subset of special objects)
2168 static struct yaffs_obj
*yaffs_create_obj(enum yaffs_obj_type type
,
2169 struct yaffs_obj
*parent
,
2174 struct yaffs_obj
*equiv_obj
,
2175 const YCHAR
*alias_str
, u32 rdev
)
2177 struct yaffs_obj
*in
;
2179 struct yaffs_dev
*dev
= parent
->my_dev
;
2181 /* Check if the entry exists.
2182 * If it does then fail the call since we don't want a dup. */
2183 if (yaffs_find_by_name(parent
, name
))
2186 if (type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
2187 str
= yaffs_clone_str(alias_str
);
2192 in
= yaffs_new_obj(dev
, -1, type
);
2201 in
->variant_type
= type
;
2203 in
->yst_mode
= mode
;
2205 yaffs_attribs_init(in
, gid
, uid
, rdev
);
2207 in
->n_data_chunks
= 0;
2209 yaffs_set_obj_name(in
, name
);
2212 yaffs_add_obj_to_dir(parent
, in
);
2214 in
->my_dev
= parent
->my_dev
;
2217 case YAFFS_OBJECT_TYPE_SYMLINK
:
2218 in
->variant
.symlink_variant
.alias
= str
;
2220 case YAFFS_OBJECT_TYPE_HARDLINK
:
2221 in
->variant
.hardlink_variant
.equiv_obj
= equiv_obj
;
2222 in
->variant
.hardlink_variant
.equiv_id
= equiv_obj
->obj_id
;
2223 list_add(&in
->hard_links
, &equiv_obj
->hard_links
);
2225 case YAFFS_OBJECT_TYPE_FILE
:
2226 case YAFFS_OBJECT_TYPE_DIRECTORY
:
2227 case YAFFS_OBJECT_TYPE_SPECIAL
:
2228 case YAFFS_OBJECT_TYPE_UNKNOWN
:
2233 if (yaffs_update_oh(in
, name
, 0, 0, 0, NULL
) < 0) {
2234 /* Could not create the object header, fail */
2240 yaffs_update_parent(parent
);
2245 struct yaffs_obj
*yaffs_create_file(struct yaffs_obj
*parent
,
2246 const YCHAR
*name
, u32 mode
, u32 uid
,
2249 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE
, parent
, name
, mode
,
2250 uid
, gid
, NULL
, NULL
, 0);
2253 struct yaffs_obj
*yaffs_create_dir(struct yaffs_obj
*parent
, const YCHAR
*name
,
2254 u32 mode
, u32 uid
, u32 gid
)
2256 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY
, parent
, name
,
2257 mode
, uid
, gid
, NULL
, NULL
, 0);
2260 struct yaffs_obj
*yaffs_create_special(struct yaffs_obj
*parent
,
2261 const YCHAR
*name
, u32 mode
, u32 uid
,
2264 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL
, parent
, name
, mode
,
2265 uid
, gid
, NULL
, NULL
, rdev
);
2268 struct yaffs_obj
*yaffs_create_symlink(struct yaffs_obj
*parent
,
2269 const YCHAR
*name
, u32 mode
, u32 uid
,
2270 u32 gid
, const YCHAR
*alias
)
2272 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK
, parent
, name
, mode
,
2273 uid
, gid
, NULL
, alias
, 0);
2276 /* yaffs_link_obj returns the object id of the equivalent object.*/
2277 struct yaffs_obj
*yaffs_link_obj(struct yaffs_obj
*parent
, const YCHAR
* name
,
2278 struct yaffs_obj
*equiv_obj
)
2280 /* Get the real object in case we were fed a hard link obj */
2281 equiv_obj
= yaffs_get_equivalent_obj(equiv_obj
);
2283 if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK
,
2284 parent
, name
, 0, 0, 0,
2285 equiv_obj
, NULL
, 0))
2294 /*---------------------- Block Management and Page Allocation -------------*/
2296 static void yaffs_deinit_blocks(struct yaffs_dev
*dev
)
2298 if (dev
->block_info_alt
&& dev
->block_info
)
2299 vfree(dev
->block_info
);
2301 kfree(dev
->block_info
);
2303 dev
->block_info_alt
= 0;
2305 dev
->block_info
= NULL
;
2307 if (dev
->chunk_bits_alt
&& dev
->chunk_bits
)
2308 vfree(dev
->chunk_bits
);
2310 kfree(dev
->chunk_bits
);
2311 dev
->chunk_bits_alt
= 0;
2312 dev
->chunk_bits
= NULL
;
2315 static int yaffs_init_blocks(struct yaffs_dev
*dev
)
2317 int n_blocks
= dev
->internal_end_block
- dev
->internal_start_block
+ 1;
2319 dev
->block_info
= NULL
;
2320 dev
->chunk_bits
= NULL
;
2321 dev
->alloc_block
= -1; /* force it to get a new one */
2323 /* If the first allocation strategy fails, thry the alternate one */
2325 kmalloc(n_blocks
* sizeof(struct yaffs_block_info
), GFP_NOFS
);
2326 if (!dev
->block_info
) {
2328 vmalloc(n_blocks
* sizeof(struct yaffs_block_info
));
2329 dev
->block_info_alt
= 1;
2331 dev
->block_info_alt
= 0;
2334 if (!dev
->block_info
)
2337 /* Set up dynamic blockinfo stuff. Round up bytes. */
2338 dev
->chunk_bit_stride
= (dev
->param
.chunks_per_block
+ 7) / 8;
2340 kmalloc(dev
->chunk_bit_stride
* n_blocks
, GFP_NOFS
);
2341 if (!dev
->chunk_bits
) {
2343 vmalloc(dev
->chunk_bit_stride
* n_blocks
);
2344 dev
->chunk_bits_alt
= 1;
2346 dev
->chunk_bits_alt
= 0;
2348 if (!dev
->chunk_bits
)
2352 memset(dev
->block_info
, 0, n_blocks
* sizeof(struct yaffs_block_info
));
2353 memset(dev
->chunk_bits
, 0, dev
->chunk_bit_stride
* n_blocks
);
2357 yaffs_deinit_blocks(dev
);
2362 void yaffs_block_became_dirty(struct yaffs_dev
*dev
, int block_no
)
2364 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, block_no
);
2368 /* If the block is still healthy erase it and mark as clean.
2369 * If the block has had a data failure, then retire it.
2372 yaffs_trace(YAFFS_TRACE_GC
| YAFFS_TRACE_ERASE
,
2373 "yaffs_block_became_dirty block %d state %d %s",
2374 block_no
, bi
->block_state
,
2375 (bi
->needs_retiring
) ? "needs retiring" : "");
2377 yaffs2_clear_oldest_dirty_seq(dev
, bi
);
2379 bi
->block_state
= YAFFS_BLOCK_STATE_DIRTY
;
2381 /* If this is the block being garbage collected then stop gc'ing */
2382 if (block_no
== dev
->gc_block
)
2385 /* If this block is currently the best candidate for gc
2386 * then drop as a candidate */
2387 if (block_no
== dev
->gc_dirtiest
) {
2388 dev
->gc_dirtiest
= 0;
2389 dev
->gc_pages_in_use
= 0;
2392 if (!bi
->needs_retiring
) {
2393 yaffs2_checkpt_invalidate(dev
);
2394 erased_ok
= yaffs_erase_block(dev
, block_no
);
2396 dev
->n_erase_failures
++;
2397 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
2398 "**>> Erasure failed %d", block_no
);
2402 /* Verify erasure if needed */
2404 ((yaffs_trace_mask
& YAFFS_TRACE_ERASE
) ||
2405 !yaffs_skip_verification(dev
))) {
2406 for (i
= 0; i
< dev
->param
.chunks_per_block
; i
++) {
2407 if (!yaffs_check_chunk_erased(dev
,
2408 block_no
* dev
->param
.chunks_per_block
+ i
)) {
2409 yaffs_trace(YAFFS_TRACE_ERROR
,
2410 ">>Block %d erasure supposedly OK, but chunk %d not erased",
2417 /* We lost a block of free space */
2418 dev
->n_free_chunks
-= dev
->param
.chunks_per_block
;
2419 yaffs_retire_block(dev
, block_no
);
2420 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
2421 "**>> Block %d retired", block_no
);
2425 /* Clean it up... */
2426 bi
->block_state
= YAFFS_BLOCK_STATE_EMPTY
;
2428 dev
->n_erased_blocks
++;
2429 bi
->pages_in_use
= 0;
2430 bi
->soft_del_pages
= 0;
2431 bi
->has_shrink_hdr
= 0;
2432 bi
->skip_erased_check
= 1; /* Clean, so no need to check */
2433 bi
->gc_prioritise
= 0;
2434 bi
->has_summary
= 0;
2436 yaffs_clear_chunk_bits(dev
, block_no
);
2438 yaffs_trace(YAFFS_TRACE_ERASE
, "Erased block %d", block_no
);
2441 static inline int yaffs_gc_process_chunk(struct yaffs_dev
*dev
,
2442 struct yaffs_block_info
*bi
,
2443 int old_chunk
, u8
*buffer
)
2447 struct yaffs_ext_tags tags
;
2448 struct yaffs_obj
*object
;
2450 int ret_val
= YAFFS_OK
;
2452 memset(&tags
, 0, sizeof(tags
));
2453 yaffs_rd_chunk_tags_nand(dev
, old_chunk
,
2455 object
= yaffs_find_by_number(dev
, tags
.obj_id
);
2457 yaffs_trace(YAFFS_TRACE_GC_DETAIL
,
2458 "Collecting chunk in block %d, %d %d %d ",
2459 dev
->gc_chunk
, tags
.obj_id
,
2460 tags
.chunk_id
, tags
.n_bytes
);
2462 if (object
&& !yaffs_skip_verification(dev
)) {
2463 if (tags
.chunk_id
== 0)
2466 else if (object
->soft_del
)
2467 /* Defeat the test */
2468 matching_chunk
= old_chunk
;
2471 yaffs_find_chunk_in_file
2472 (object
, tags
.chunk_id
,
2475 if (old_chunk
!= matching_chunk
)
2476 yaffs_trace(YAFFS_TRACE_ERROR
,
2477 "gc: page in gc mismatch: %d %d %d %d",
2485 yaffs_trace(YAFFS_TRACE_ERROR
,
2486 "page %d in gc has no object: %d %d %d ",
2488 tags
.obj_id
, tags
.chunk_id
,
2494 object
->soft_del
&& tags
.chunk_id
!= 0) {
2495 /* Data chunk in a soft deleted file,
2497 * It's a soft deleted data chunk,
2498 * No need to copy this, just forget
2499 * about it and fix up the object.
2502 /* Free chunks already includes
2503 * softdeleted chunks, how ever this
2504 * chunk is going to soon be really
2505 * deleted which will increment free
2506 * chunks. We have to decrement free
2507 * chunks so this works out properly.
2509 dev
->n_free_chunks
--;
2510 bi
->soft_del_pages
--;
2512 object
->n_data_chunks
--;
2513 if (object
->n_data_chunks
<= 0) {
2514 /* remeber to clean up obj */
2515 dev
->gc_cleanup_list
[dev
->n_clean_ups
] = tags
.obj_id
;
2519 } else if (object
) {
2520 /* It's either a data chunk in a live
2521 * file or an ObjectHeader, so we're
2523 * NB Need to keep the ObjectHeaders of
2524 * deleted files until the whole file
2525 * has been deleted off
2527 tags
.serial_number
++;
2530 if (tags
.chunk_id
== 0) {
2531 /* It is an object Id,
2532 * We need to nuke the
2533 * shrinkheader flags since its
2535 * Also need to clean up
2538 struct yaffs_obj_hdr
*oh
;
2539 oh
= (struct yaffs_obj_hdr
*) buffer
;
2542 tags
.extra_is_shrink
= 0;
2543 oh
->shadows_obj
= 0;
2544 oh
->inband_shadowed_obj_id
= 0;
2545 tags
.extra_shadows
= 0;
2547 /* Update file size */
2548 if (object
->variant_type
== YAFFS_OBJECT_TYPE_FILE
) {
2549 yaffs_oh_size_load(oh
,
2550 object
->variant
.file_variant
.file_size
);
2551 tags
.extra_file_size
=
2552 object
->variant
.file_variant
.file_size
;
2555 yaffs_verify_oh(object
, oh
, &tags
, 1);
2557 yaffs_write_new_chunk(dev
, (u8
*) oh
, &tags
, 1);
2560 yaffs_write_new_chunk(dev
, buffer
, &tags
, 1);
2563 if (new_chunk
< 0) {
2564 ret_val
= YAFFS_FAIL
;
2567 /* Now fix up the Tnodes etc. */
2569 if (tags
.chunk_id
== 0) {
2571 object
->hdr_chunk
= new_chunk
;
2572 object
->serial
= tags
.serial_number
;
2574 /* It's a data chunk */
2575 yaffs_put_chunk_in_file(object
, tags
.chunk_id
,
2580 if (ret_val
== YAFFS_OK
)
2581 yaffs_chunk_del(dev
, old_chunk
, mark_flash
, __LINE__
);
2585 static int yaffs_gc_block(struct yaffs_dev
*dev
, int block
, int whole_block
)
2588 int ret_val
= YAFFS_OK
;
2590 int is_checkpt_block
;
2592 int chunks_before
= yaffs_get_erased_chunks(dev
);
2594 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, block
);
2596 is_checkpt_block
= (bi
->block_state
== YAFFS_BLOCK_STATE_CHECKPOINT
);
2598 yaffs_trace(YAFFS_TRACE_TRACING
,
2599 "Collecting block %d, in use %d, shrink %d, whole_block %d",
2600 block
, bi
->pages_in_use
, bi
->has_shrink_hdr
,
2603 /*yaffs_verify_free_chunks(dev); */
2605 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
)
2606 bi
->block_state
= YAFFS_BLOCK_STATE_COLLECTING
;
2608 bi
->has_shrink_hdr
= 0; /* clear the flag so that the block can erase */
2610 dev
->gc_disable
= 1;
2612 yaffs_summary_gc(dev
, block
);
2614 if (is_checkpt_block
|| !yaffs_still_some_chunks(dev
, block
)) {
2615 yaffs_trace(YAFFS_TRACE_TRACING
,
2616 "Collecting block %d that has no chunks in use",
2618 yaffs_block_became_dirty(dev
, block
);
2621 u8
*buffer
= yaffs_get_temp_buffer(dev
);
2623 yaffs_verify_blk(dev
, bi
, block
);
2625 max_copies
= (whole_block
) ? dev
->param
.chunks_per_block
: 5;
2626 old_chunk
= block
* dev
->param
.chunks_per_block
+ dev
->gc_chunk
;
2628 for (/* init already done */ ;
2629 ret_val
== YAFFS_OK
&&
2630 dev
->gc_chunk
< dev
->param
.chunks_per_block
&&
2631 (bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) &&
2633 dev
->gc_chunk
++, old_chunk
++) {
2634 if (yaffs_check_chunk_bit(dev
, block
, dev
->gc_chunk
)) {
2635 /* Page is in use and might need to be copied */
2637 ret_val
= yaffs_gc_process_chunk(dev
, bi
,
2641 yaffs_release_temp_buffer(dev
, buffer
);
2644 yaffs_verify_collected_blk(dev
, bi
, block
);
2646 if (bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) {
2648 * The gc did not complete. Set block state back to FULL
2649 * because checkpointing does not restore gc.
2651 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
2653 /* The gc completed. */
2654 /* Do any required cleanups */
2655 for (i
= 0; i
< dev
->n_clean_ups
; i
++) {
2656 /* Time to delete the file too */
2657 struct yaffs_obj
*object
=
2658 yaffs_find_by_number(dev
, dev
->gc_cleanup_list
[i
]);
2660 yaffs_free_tnode(dev
,
2661 object
->variant
.file_variant
.top
);
2662 object
->variant
.file_variant
.top
= NULL
;
2663 yaffs_trace(YAFFS_TRACE_GC
,
2664 "yaffs: About to finally delete object %d",
2666 yaffs_generic_obj_del(object
);
2667 object
->my_dev
->n_deleted_files
--;
2671 chunks_after
= yaffs_get_erased_chunks(dev
);
2672 if (chunks_before
>= chunks_after
)
2673 yaffs_trace(YAFFS_TRACE_GC
,
2674 "gc did not increase free chunks before %d after %d",
2675 chunks_before
, chunks_after
);
2678 dev
->n_clean_ups
= 0;
2681 dev
->gc_disable
= 0;
2687 * find_gc_block() selects the dirtiest block (or close enough)
2688 * for garbage collection.
2691 static unsigned yaffs_find_gc_block(struct yaffs_dev
*dev
,
2692 int aggressive
, int background
)
2696 unsigned selected
= 0;
2697 int prioritised
= 0;
2698 int prioritised_exist
= 0;
2699 struct yaffs_block_info
*bi
;
2702 /* First let's see if we need to grab a prioritised block */
2703 if (dev
->has_pending_prioritised_gc
&& !aggressive
) {
2704 dev
->gc_dirtiest
= 0;
2705 bi
= dev
->block_info
;
2706 for (i
= dev
->internal_start_block
;
2707 i
<= dev
->internal_end_block
&& !selected
; i
++) {
2709 if (bi
->gc_prioritise
) {
2710 prioritised_exist
= 1;
2711 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
&&
2712 yaffs_block_ok_for_gc(dev
, bi
)) {
2721 * If there is a prioritised block and none was selected then
2722 * this happened because there is at least one old dirty block
2723 * gumming up the works. Let's gc the oldest dirty block.
2726 if (prioritised_exist
&&
2727 !selected
&& dev
->oldest_dirty_block
> 0)
2728 selected
= dev
->oldest_dirty_block
;
2730 if (!prioritised_exist
) /* None found, so we can clear this */
2731 dev
->has_pending_prioritised_gc
= 0;
2734 /* If we're doing aggressive GC then we are happy to take a less-dirty
2735 * block, and search harder.
2736 * else (leasurely gc), then we only bother to do this if the
2737 * block has only a few pages in use.
2743 dev
->internal_end_block
- dev
->internal_start_block
+ 1;
2745 threshold
= dev
->param
.chunks_per_block
;
2746 iterations
= n_blocks
;
2751 max_threshold
= dev
->param
.chunks_per_block
/ 2;
2753 max_threshold
= dev
->param
.chunks_per_block
/ 8;
2755 if (max_threshold
< YAFFS_GC_PASSIVE_THRESHOLD
)
2756 max_threshold
= YAFFS_GC_PASSIVE_THRESHOLD
;
2758 threshold
= background
? (dev
->gc_not_done
+ 2) * 2 : 0;
2759 if (threshold
< YAFFS_GC_PASSIVE_THRESHOLD
)
2760 threshold
= YAFFS_GC_PASSIVE_THRESHOLD
;
2761 if (threshold
> max_threshold
)
2762 threshold
= max_threshold
;
2764 iterations
= n_blocks
/ 16 + 1;
2765 if (iterations
> 100)
2771 (dev
->gc_dirtiest
< 1 ||
2772 dev
->gc_pages_in_use
> YAFFS_GC_GOOD_ENOUGH
);
2774 dev
->gc_block_finder
++;
2775 if (dev
->gc_block_finder
< dev
->internal_start_block
||
2776 dev
->gc_block_finder
> dev
->internal_end_block
)
2777 dev
->gc_block_finder
=
2778 dev
->internal_start_block
;
2780 bi
= yaffs_get_block_info(dev
, dev
->gc_block_finder
);
2782 pages_used
= bi
->pages_in_use
- bi
->soft_del_pages
;
2784 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
&&
2785 pages_used
< dev
->param
.chunks_per_block
&&
2786 (dev
->gc_dirtiest
< 1 ||
2787 pages_used
< dev
->gc_pages_in_use
) &&
2788 yaffs_block_ok_for_gc(dev
, bi
)) {
2789 dev
->gc_dirtiest
= dev
->gc_block_finder
;
2790 dev
->gc_pages_in_use
= pages_used
;
2794 if (dev
->gc_dirtiest
> 0 && dev
->gc_pages_in_use
<= threshold
)
2795 selected
= dev
->gc_dirtiest
;
2799 * If nothing has been selected for a while, try the oldest dirty
2800 * because that's gumming up the works.
2803 if (!selected
&& dev
->param
.is_yaffs2
&&
2804 dev
->gc_not_done
>= (background
? 10 : 20)) {
2805 yaffs2_find_oldest_dirty_seq(dev
);
2806 if (dev
->oldest_dirty_block
> 0) {
2807 selected
= dev
->oldest_dirty_block
;
2808 dev
->gc_dirtiest
= selected
;
2809 dev
->oldest_dirty_gc_count
++;
2810 bi
= yaffs_get_block_info(dev
, selected
);
2811 dev
->gc_pages_in_use
=
2812 bi
->pages_in_use
- bi
->soft_del_pages
;
2814 dev
->gc_not_done
= 0;
2819 yaffs_trace(YAFFS_TRACE_GC
,
2820 "GC Selected block %d with %d free, prioritised:%d",
2822 dev
->param
.chunks_per_block
- dev
->gc_pages_in_use
,
2829 dev
->gc_dirtiest
= 0;
2830 dev
->gc_pages_in_use
= 0;
2831 dev
->gc_not_done
= 0;
2832 if (dev
->refresh_skip
> 0)
2833 dev
->refresh_skip
--;
2836 yaffs_trace(YAFFS_TRACE_GC
,
2837 "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2838 dev
->gc_block_finder
, dev
->gc_not_done
, threshold
,
2839 dev
->gc_dirtiest
, dev
->gc_pages_in_use
,
2840 dev
->oldest_dirty_block
, background
? " bg" : "");
2846 /* New garbage collector
2847 * If we're very low on erased blocks then we do aggressive garbage collection
2848 * otherwise we do "leasurely" garbage collection.
2849 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2850 * Passive gc only inspects smaller areas and only accepts more dirty blocks.
2852 * The idea is to help clear out space in a more spread-out manner.
2853 * Dunno if it really does anything useful.
2855 static int yaffs_check_gc(struct yaffs_dev
*dev
, int background
)
2858 int gc_ok
= YAFFS_OK
;
2862 int checkpt_block_adjust
;
2864 if (dev
->param
.gc_control_fn
&&
2865 (dev
->param
.gc_control_fn(dev
) & 1) == 0)
2868 if (dev
->gc_disable
)
2869 /* Bail out so we don't get recursive gc */
2872 /* This loop should pass the first time.
2873 * Only loops here if the collection does not increase space.
2879 checkpt_block_adjust
= yaffs_calc_checkpt_blocks_required(dev
);
2882 dev
->param
.n_reserved_blocks
+ checkpt_block_adjust
+ 1;
2884 dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2886 /* If we need a block soon then do aggressive gc. */
2887 if (dev
->n_erased_blocks
< min_erased
)
2891 && erased_chunks
> (dev
->n_free_chunks
/ 4))
2894 if (dev
->gc_skip
> 20)
2896 if (erased_chunks
< dev
->n_free_chunks
/ 2 ||
2897 dev
->gc_skip
< 1 || background
)
2907 /* If we don't already have a block being gc'd then see if we
2908 * should start another */
2910 if (dev
->gc_block
< 1 && !aggressive
) {
2911 dev
->gc_block
= yaffs2_find_refresh_block(dev
);
2913 dev
->n_clean_ups
= 0;
2915 if (dev
->gc_block
< 1) {
2917 yaffs_find_gc_block(dev
, aggressive
, background
);
2919 dev
->n_clean_ups
= 0;
2922 if (dev
->gc_block
> 0) {
2925 dev
->passive_gc_count
++;
2927 yaffs_trace(YAFFS_TRACE_GC
,
2928 "yaffs: GC n_erased_blocks %d aggressive %d",
2929 dev
->n_erased_blocks
, aggressive
);
2931 gc_ok
= yaffs_gc_block(dev
, dev
->gc_block
, aggressive
);
2934 if (dev
->n_erased_blocks
< (dev
->param
.n_reserved_blocks
) &&
2935 dev
->gc_block
> 0) {
2936 yaffs_trace(YAFFS_TRACE_GC
,
2937 "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2938 dev
->n_erased_blocks
, max_tries
,
2941 } while ((dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
) &&
2942 (dev
->gc_block
> 0) && (max_tries
< 2));
2944 return aggressive
? gc_ok
: YAFFS_OK
;
2949 * Garbage collects. Intended to be called from a background thread.
2950 * Returns non-zero if at least half the free chunks are erased.
2952 int yaffs_bg_gc(struct yaffs_dev
*dev
, unsigned urgency
)
2954 int erased_chunks
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2956 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Background gc %u", urgency
);
2958 yaffs_check_gc(dev
, 1);
2959 return erased_chunks
> dev
->n_free_chunks
/ 2;
2962 /*-------------------- Data file manipulation -----------------*/
2964 static int yaffs_rd_data_obj(struct yaffs_obj
*in
, int inode_chunk
, u8
* buffer
)
2966 int nand_chunk
= yaffs_find_chunk_in_file(in
, inode_chunk
, NULL
);
2968 if (nand_chunk
>= 0)
2969 return yaffs_rd_chunk_tags_nand(in
->my_dev
, nand_chunk
,
2972 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
2973 "Chunk %d not found zero instead",
2975 /* get sane (zero) data if you read a hole */
2976 memset(buffer
, 0, in
->my_dev
->data_bytes_per_chunk
);
2982 void yaffs_chunk_del(struct yaffs_dev
*dev
, int chunk_id
, int mark_flash
,
2987 struct yaffs_ext_tags tags
;
2988 struct yaffs_block_info
*bi
;
2994 block
= chunk_id
/ dev
->param
.chunks_per_block
;
2995 page
= chunk_id
% dev
->param
.chunks_per_block
;
2997 if (!yaffs_check_chunk_bit(dev
, block
, page
))
2998 yaffs_trace(YAFFS_TRACE_VERIFY
,
2999 "Deleting invalid chunk %d", chunk_id
);
3001 bi
= yaffs_get_block_info(dev
, block
);
3003 yaffs2_update_oldest_dirty_seq(dev
, block
, bi
);
3005 yaffs_trace(YAFFS_TRACE_DELETION
,
3006 "line %d delete of chunk %d",
3009 if (!dev
->param
.is_yaffs2
&& mark_flash
&&
3010 bi
->block_state
!= YAFFS_BLOCK_STATE_COLLECTING
) {
3012 memset(&tags
, 0, sizeof(tags
));
3013 tags
.is_deleted
= 1;
3014 yaffs_wr_chunk_tags_nand(dev
, chunk_id
, NULL
, &tags
);
3015 yaffs_handle_chunk_update(dev
, chunk_id
, &tags
);
3017 dev
->n_unmarked_deletions
++;
3020 /* Pull out of the management area.
3021 * If the whole block became dirty, this will kick off an erasure.
3023 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
||
3024 bi
->block_state
== YAFFS_BLOCK_STATE_FULL
||
3025 bi
->block_state
== YAFFS_BLOCK_STATE_NEEDS_SCAN
||
3026 bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) {
3027 dev
->n_free_chunks
++;
3028 yaffs_clear_chunk_bit(dev
, block
, page
);
3031 if (bi
->pages_in_use
== 0 &&
3032 !bi
->has_shrink_hdr
&&
3033 bi
->block_state
!= YAFFS_BLOCK_STATE_ALLOCATING
&&
3034 bi
->block_state
!= YAFFS_BLOCK_STATE_NEEDS_SCAN
) {
3035 yaffs_block_became_dirty(dev
, block
);
3040 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
3041 const u8
*buffer
, int n_bytes
, int use_reserve
)
3043 /* Find old chunk Need to do this to get serial number
3044 * Write new one and patch into tree.
3045 * Invalidate old tags.
3049 struct yaffs_ext_tags prev_tags
;
3051 struct yaffs_ext_tags new_tags
;
3052 struct yaffs_dev
*dev
= in
->my_dev
;
3054 yaffs_check_gc(dev
, 0);
3056 /* Get the previous chunk at this location in the file if it exists.
3057 * If it does not exist then put a zero into the tree. This creates
3058 * the tnode now, rather than later when it is harder to clean up.
3060 prev_chunk_id
= yaffs_find_chunk_in_file(in
, inode_chunk
, &prev_tags
);
3061 if (prev_chunk_id
< 1 &&
3062 !yaffs_put_chunk_in_file(in
, inode_chunk
, 0, 0))
3065 /* Set up new tags */
3066 memset(&new_tags
, 0, sizeof(new_tags
));
3068 new_tags
.chunk_id
= inode_chunk
;
3069 new_tags
.obj_id
= in
->obj_id
;
3070 new_tags
.serial_number
=
3071 (prev_chunk_id
> 0) ? prev_tags
.serial_number
+ 1 : 1;
3072 new_tags
.n_bytes
= n_bytes
;
3074 if (n_bytes
< 1 || n_bytes
> dev
->param
.total_bytes_per_chunk
) {
3075 yaffs_trace(YAFFS_TRACE_ERROR
,
3076 "Writing %d bytes to chunk!!!!!!!!!",
3082 yaffs_write_new_chunk(dev
, buffer
, &new_tags
, use_reserve
);
3084 if (new_chunk_id
> 0) {
3085 yaffs_put_chunk_in_file(in
, inode_chunk
, new_chunk_id
, 0);
3087 if (prev_chunk_id
> 0)
3088 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3090 yaffs_verify_file_sane(in
);
3092 return new_chunk_id
;
3098 static int yaffs_do_xattrib_mod(struct yaffs_obj
*obj
, int set
,
3099 const YCHAR
*name
, const void *value
, int size
,
3102 struct yaffs_xattr_mod xmod
;
3110 xmod
.result
= -ENOSPC
;
3112 result
= yaffs_update_oh(obj
, NULL
, 0, 0, 0, &xmod
);
3120 static int yaffs_apply_xattrib_mod(struct yaffs_obj
*obj
, char *buffer
,
3121 struct yaffs_xattr_mod
*xmod
)
3124 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3125 struct yaffs_dev
*dev
= obj
->my_dev
;
3126 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3127 char *x_buffer
= buffer
+ x_offs
;
3131 nval_set(x_buffer
, x_size
, xmod
->name
, xmod
->data
,
3132 xmod
->size
, xmod
->flags
);
3134 retval
= nval_del(x_buffer
, x_size
, xmod
->name
);
3136 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3137 obj
->xattr_known
= 1;
3138 xmod
->result
= retval
;
3143 static int yaffs_do_xattrib_fetch(struct yaffs_obj
*obj
, const YCHAR
*name
,
3144 void *value
, int size
)
3146 char *buffer
= NULL
;
3148 struct yaffs_ext_tags tags
;
3149 struct yaffs_dev
*dev
= obj
->my_dev
;
3150 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3151 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3155 if (obj
->hdr_chunk
< 1)
3158 /* If we know that the object has no xattribs then don't do all the
3159 * reading and parsing.
3161 if (obj
->xattr_known
&& !obj
->has_xattr
) {
3168 buffer
= (char *)yaffs_get_temp_buffer(dev
);
3173 yaffs_rd_chunk_tags_nand(dev
, obj
->hdr_chunk
, (u8
*) buffer
, &tags
);
3175 if (result
!= YAFFS_OK
)
3178 x_buffer
= buffer
+ x_offs
;
3180 if (!obj
->xattr_known
) {
3181 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3182 obj
->xattr_known
= 1;
3186 retval
= nval_get(x_buffer
, x_size
, name
, value
, size
);
3188 retval
= nval_list(x_buffer
, x_size
, value
, size
);
3190 yaffs_release_temp_buffer(dev
, (u8
*) buffer
);
3194 int yaffs_set_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
,
3195 const void *value
, int size
, int flags
)
3197 return yaffs_do_xattrib_mod(obj
, 1, name
, value
, size
, flags
);
3200 int yaffs_remove_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
)
3202 return yaffs_do_xattrib_mod(obj
, 0, name
, NULL
, 0, 0);
3205 int yaffs_get_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
, void *value
,
3208 return yaffs_do_xattrib_fetch(obj
, name
, value
, size
);
3211 int yaffs_list_xattrib(struct yaffs_obj
*obj
, char *buffer
, int size
)
3213 return yaffs_do_xattrib_fetch(obj
, NULL
, buffer
, size
);
3216 static void yaffs_check_obj_details_loaded(struct yaffs_obj
*in
)
3219 struct yaffs_obj_hdr
*oh
;
3220 struct yaffs_dev
*dev
;
3221 struct yaffs_ext_tags tags
;
3223 int alloc_failed
= 0;
3225 if (!in
|| !in
->lazy_loaded
|| in
->hdr_chunk
< 1)
3229 in
->lazy_loaded
= 0;
3230 buf
= yaffs_get_temp_buffer(dev
);
3232 result
= yaffs_rd_chunk_tags_nand(dev
, in
->hdr_chunk
, buf
, &tags
);
3233 oh
= (struct yaffs_obj_hdr
*)buf
;
3235 in
->yst_mode
= oh
->yst_mode
;
3236 yaffs_load_attribs(in
, oh
);
3237 yaffs_set_obj_name_from_oh(in
, oh
);
3239 if (in
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
3240 in
->variant
.symlink_variant
.alias
=
3241 yaffs_clone_str(oh
->alias
);
3242 if (!in
->variant
.symlink_variant
.alias
)
3243 alloc_failed
= 1; /* Not returned */
3245 yaffs_release_temp_buffer(dev
, buf
);
3248 /* UpdateObjectHeader updates the header on NAND for an object.
3249 * If name is not NULL, then that new name is used.
3251 int yaffs_update_oh(struct yaffs_obj
*in
, const YCHAR
*name
, int force
,
3252 int is_shrink
, int shadows
, struct yaffs_xattr_mod
*xmod
)
3255 struct yaffs_block_info
*bi
;
3256 struct yaffs_dev
*dev
= in
->my_dev
;
3261 struct yaffs_ext_tags new_tags
;
3262 struct yaffs_ext_tags old_tags
;
3263 const YCHAR
*alias
= NULL
;
3265 YCHAR old_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
3266 struct yaffs_obj_hdr
*oh
= NULL
;
3267 loff_t file_size
= 0;
3269 strcpy(old_name
, _Y("silly old name"));
3271 if (in
->fake
&& in
!= dev
->root_dir
&& !force
&& !xmod
)
3274 yaffs_check_gc(dev
, 0);
3275 yaffs_check_obj_details_loaded(in
);
3277 buffer
= yaffs_get_temp_buffer(in
->my_dev
);
3278 oh
= (struct yaffs_obj_hdr
*)buffer
;
3280 prev_chunk_id
= in
->hdr_chunk
;
3282 if (prev_chunk_id
> 0) {
3283 result
= yaffs_rd_chunk_tags_nand(dev
, prev_chunk_id
,
3286 yaffs_verify_oh(in
, oh
, &old_tags
, 0);
3287 memcpy(old_name
, oh
->name
, sizeof(oh
->name
));
3288 memset(buffer
, 0xff, sizeof(struct yaffs_obj_hdr
));
3290 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
3293 oh
->type
= in
->variant_type
;
3294 oh
->yst_mode
= in
->yst_mode
;
3295 oh
->shadows_obj
= oh
->inband_shadowed_obj_id
= shadows
;
3297 yaffs_load_attribs_oh(oh
, in
);
3300 oh
->parent_obj_id
= in
->parent
->obj_id
;
3302 oh
->parent_obj_id
= 0;
3304 if (name
&& *name
) {
3305 memset(oh
->name
, 0, sizeof(oh
->name
));
3306 yaffs_load_oh_from_name(dev
, oh
->name
, name
);
3307 } else if (prev_chunk_id
> 0) {
3308 memcpy(oh
->name
, old_name
, sizeof(oh
->name
));
3310 memset(oh
->name
, 0, sizeof(oh
->name
));
3313 oh
->is_shrink
= is_shrink
;
3315 switch (in
->variant_type
) {
3316 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3317 /* Should not happen */
3319 case YAFFS_OBJECT_TYPE_FILE
:
3320 if (oh
->parent_obj_id
!= YAFFS_OBJECTID_DELETED
&&
3321 oh
->parent_obj_id
!= YAFFS_OBJECTID_UNLINKED
)
3322 file_size
= in
->variant
.file_variant
.file_size
;
3323 yaffs_oh_size_load(oh
, file_size
);
3325 case YAFFS_OBJECT_TYPE_HARDLINK
:
3326 oh
->equiv_id
= in
->variant
.hardlink_variant
.equiv_id
;
3328 case YAFFS_OBJECT_TYPE_SPECIAL
:
3331 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3334 case YAFFS_OBJECT_TYPE_SYMLINK
:
3335 alias
= in
->variant
.symlink_variant
.alias
;
3337 alias
= _Y("no alias");
3338 strncpy(oh
->alias
, alias
, YAFFS_MAX_ALIAS_LENGTH
);
3339 oh
->alias
[YAFFS_MAX_ALIAS_LENGTH
] = 0;
3343 /* process any xattrib modifications */
3345 yaffs_apply_xattrib_mod(in
, (char *)buffer
, xmod
);
3348 memset(&new_tags
, 0, sizeof(new_tags
));
3350 new_tags
.chunk_id
= 0;
3351 new_tags
.obj_id
= in
->obj_id
;
3352 new_tags
.serial_number
= in
->serial
;
3354 /* Add extra info for file header */
3355 new_tags
.extra_available
= 1;
3356 new_tags
.extra_parent_id
= oh
->parent_obj_id
;
3357 new_tags
.extra_file_size
= file_size
;
3358 new_tags
.extra_is_shrink
= oh
->is_shrink
;
3359 new_tags
.extra_equiv_id
= oh
->equiv_id
;
3360 new_tags
.extra_shadows
= (oh
->shadows_obj
> 0) ? 1 : 0;
3361 new_tags
.extra_obj_type
= in
->variant_type
;
3362 yaffs_verify_oh(in
, oh
, &new_tags
, 1);
3364 /* Create new chunk in NAND */
3366 yaffs_write_new_chunk(dev
, buffer
, &new_tags
,
3367 (prev_chunk_id
> 0) ? 1 : 0);
3370 yaffs_release_temp_buffer(dev
, buffer
);
3372 if (new_chunk_id
< 0)
3373 return new_chunk_id
;
3375 in
->hdr_chunk
= new_chunk_id
;
3377 if (prev_chunk_id
> 0)
3378 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3380 if (!yaffs_obj_cache_dirty(in
))
3383 /* If this was a shrink, then mark the block
3384 * that the chunk lives on */
3386 bi
= yaffs_get_block_info(in
->my_dev
,
3388 in
->my_dev
->param
.chunks_per_block
);
3389 bi
->has_shrink_hdr
= 1;
3393 return new_chunk_id
;
3396 /*--------------------- File read/write ------------------------
3397 * Read and write have very similar structures.
3398 * In general the read/write has three parts to it
3399 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3400 * Some complete chunks
3401 * An incomplete chunk to end off with
3403 * Curve-balls: the first chunk might also be the last chunk.
3406 int yaffs_file_rd(struct yaffs_obj
*in
, u8
* buffer
, loff_t offset
, int n_bytes
)
3413 struct yaffs_cache
*cache
;
3414 struct yaffs_dev
*dev
;
3419 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3422 /* OK now check for the curveball where the start and end are in
3425 if ((start
+ n
) < dev
->data_bytes_per_chunk
)
3428 n_copy
= dev
->data_bytes_per_chunk
- start
;
3430 cache
= yaffs_find_chunk_cache(in
, chunk
);
3432 /* If the chunk is already in the cache or it is less than
3433 * a whole chunk or we're using inband tags then use the cache
3434 * (if there is caching) else bypass the cache.
3436 if (cache
|| n_copy
!= dev
->data_bytes_per_chunk
||
3437 dev
->param
.inband_tags
) {
3438 if (dev
->param
.n_caches
> 0) {
3440 /* If we can't find the data in the cache,
3441 * then load it up. */
3445 yaffs_grab_chunk_cache(in
->my_dev
);
3447 cache
->chunk_id
= chunk
;
3450 yaffs_rd_data_obj(in
, chunk
,
3455 yaffs_use_cache(dev
, cache
, 0);
3459 memcpy(buffer
, &cache
->data
[start
], n_copy
);
3463 /* Read into the local buffer then copy.. */
3466 yaffs_get_temp_buffer(dev
);
3467 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3469 memcpy(buffer
, &local_buffer
[start
], n_copy
);
3471 yaffs_release_temp_buffer(dev
, local_buffer
);
3474 /* A full chunk. Read directly into the buffer. */
3475 yaffs_rd_data_obj(in
, chunk
, buffer
);
3485 int yaffs_do_file_wr(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3486 int n_bytes
, int write_through
)
3495 loff_t start_write
= offset
;
3496 int chunk_written
= 0;
3499 struct yaffs_dev
*dev
;
3503 while (n
> 0 && chunk_written
>= 0) {
3504 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3506 if (((loff_t
)chunk
) *
3507 dev
->data_bytes_per_chunk
+ start
!= offset
||
3508 start
>= dev
->data_bytes_per_chunk
) {
3509 yaffs_trace(YAFFS_TRACE_ERROR
,
3510 "AddrToChunk of offset %lld gives chunk %d start %d",
3511 offset
, chunk
, start
);
3513 chunk
++; /* File pos to chunk in file offset */
3515 /* OK now check for the curveball where the start and end are in
3519 if ((start
+ n
) < dev
->data_bytes_per_chunk
) {
3522 /* Now calculate how many bytes to write back....
3523 * If we're overwriting and not writing to then end of
3524 * file then we need to write back as much as was there
3528 chunk_start
= (((loff_t
)(chunk
- 1)) *
3529 dev
->data_bytes_per_chunk
);
3531 if (chunk_start
> in
->variant
.file_variant
.file_size
)
3532 n_bytes_read
= 0; /* Past end of file */
3535 in
->variant
.file_variant
.file_size
-
3538 if (n_bytes_read
> dev
->data_bytes_per_chunk
)
3539 n_bytes_read
= dev
->data_bytes_per_chunk
;
3543 (start
+ n
)) ? n_bytes_read
: (start
+ n
);
3545 if (n_writeback
< 0 ||
3546 n_writeback
> dev
->data_bytes_per_chunk
)
3550 n_copy
= dev
->data_bytes_per_chunk
- start
;
3551 n_writeback
= dev
->data_bytes_per_chunk
;
3554 if (n_copy
!= dev
->data_bytes_per_chunk
||
3555 !dev
->param
.cache_bypass_aligned
||
3556 dev
->param
.inband_tags
) {
3557 /* An incomplete start or end chunk (or maybe both
3558 * start and end chunk), or we're using inband tags,
3559 * or we're forcing writes through the cache,
3560 * so we want to use the cache buffers.
3562 if (dev
->param
.n_caches
> 0) {
3563 struct yaffs_cache
*cache
;
3565 /* If we can't find the data in the cache, then
3567 cache
= yaffs_find_chunk_cache(in
, chunk
);
3570 yaffs_check_alloc_available(dev
, 1)) {
3571 cache
= yaffs_grab_chunk_cache(dev
);
3573 cache
->chunk_id
= chunk
;
3576 yaffs_rd_data_obj(in
, chunk
,
3580 !yaffs_check_alloc_available(dev
,
3582 /* Drop the cache if it was a read cache
3583 * item and no space check has been made
3590 yaffs_use_cache(dev
, cache
, 1);
3593 memcpy(&cache
->data
[start
], buffer
,
3597 cache
->n_bytes
= n_writeback
;
3599 if (write_through
) {
3609 chunk_written
= -1; /* fail write */
3612 /* An incomplete start or end chunk (or maybe
3613 * both start and end chunk). Read into the
3614 * local buffer then copy over and write back.
3617 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3619 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3620 memcpy(&local_buffer
[start
], buffer
, n_copy
);
3623 yaffs_wr_data_obj(in
, chunk
,
3627 yaffs_release_temp_buffer(dev
, local_buffer
);
3630 /* A full chunk. Write directly from the buffer. */
3633 yaffs_wr_data_obj(in
, chunk
, buffer
,
3634 dev
->data_bytes_per_chunk
, 0);
3636 /* Since we've overwritten the cached data,
3637 * we better invalidate it. */
3638 yaffs_invalidate_chunk_cache(in
, chunk
);
3641 if (chunk_written
>= 0) {
3649 /* Update file object */
3651 if ((start_write
+ n_done
) > in
->variant
.file_variant
.file_size
)
3652 in
->variant
.file_variant
.file_size
= (start_write
+ n_done
);
3658 int yaffs_wr_file(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3659 int n_bytes
, int write_through
)
3661 yaffs2_handle_hole(in
, offset
);
3662 return yaffs_do_file_wr(in
, buffer
, offset
, n_bytes
, write_through
);
3665 /* ---------------------- File resizing stuff ------------------ */
3667 static void yaffs_prune_chunks(struct yaffs_obj
*in
, loff_t new_size
)
3670 struct yaffs_dev
*dev
= in
->my_dev
;
3671 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3679 yaffs_addr_to_chunk(dev
, old_size
- 1, &last_del
, &dummy
);
3683 yaffs_addr_to_chunk(dev
, new_size
+ dev
->data_bytes_per_chunk
- 1,
3684 &start_del
, &dummy
);
3688 /* Delete backwards so that we don't end up with holes if
3689 * power is lost part-way through the operation.
3691 for (i
= last_del
; i
>= start_del
; i
--) {
3692 /* NB this could be optimised somewhat,
3693 * eg. could retrieve the tags and write them without
3694 * using yaffs_chunk_del
3697 chunk_id
= yaffs_find_del_file_chunk(in
, i
, NULL
);
3703 (dev
->internal_start_block
* dev
->param
.chunks_per_block
) ||
3705 ((dev
->internal_end_block
+ 1) *
3706 dev
->param
.chunks_per_block
)) {
3707 yaffs_trace(YAFFS_TRACE_ALWAYS
,
3708 "Found daft chunk_id %d for %d",
3711 in
->n_data_chunks
--;
3712 yaffs_chunk_del(dev
, chunk_id
, 1, __LINE__
);
3717 void yaffs_resize_file_down(struct yaffs_obj
*obj
, loff_t new_size
)
3721 struct yaffs_dev
*dev
= obj
->my_dev
;
3723 yaffs_addr_to_chunk(dev
, new_size
, &new_full
, &new_partial
);
3725 yaffs_prune_chunks(obj
, new_size
);
3727 if (new_partial
!= 0) {
3728 int last_chunk
= 1 + new_full
;
3729 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3731 /* Rewrite the last chunk with its new size and zero pad */
3732 yaffs_rd_data_obj(obj
, last_chunk
, local_buffer
);
3733 memset(local_buffer
+ new_partial
, 0,
3734 dev
->data_bytes_per_chunk
- new_partial
);
3736 yaffs_wr_data_obj(obj
, last_chunk
, local_buffer
,
3739 yaffs_release_temp_buffer(dev
, local_buffer
);
3742 obj
->variant
.file_variant
.file_size
= new_size
;
3744 yaffs_prune_tree(dev
, &obj
->variant
.file_variant
);
3747 int yaffs_resize_file(struct yaffs_obj
*in
, loff_t new_size
)
3749 struct yaffs_dev
*dev
= in
->my_dev
;
3750 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3752 yaffs_flush_file_cache(in
, 1);
3753 yaffs_invalidate_whole_cache(in
);
3755 yaffs_check_gc(dev
, 0);
3757 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
)
3760 if (new_size
== old_size
)
3763 if (new_size
> old_size
) {
3764 yaffs2_handle_hole(in
, new_size
);
3765 in
->variant
.file_variant
.file_size
= new_size
;
3767 /* new_size < old_size */
3768 yaffs_resize_file_down(in
, new_size
);
3771 /* Write a new object header to reflect the resize.
3772 * show we've shrunk the file, if need be
3773 * Do this only if the file is not in the deleted directories
3774 * and is not shadowed.
3778 in
->parent
->obj_id
!= YAFFS_OBJECTID_UNLINKED
&&
3779 in
->parent
->obj_id
!= YAFFS_OBJECTID_DELETED
)
3780 yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
);
3785 int yaffs_flush_file(struct yaffs_obj
*in
,
3793 yaffs_flush_file_cache(in
, discard_cache
);
3799 yaffs_load_current_time(in
, 0, 0);
3801 return (yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
) >= 0) ?
3802 YAFFS_OK
: YAFFS_FAIL
;
3806 /* yaffs_del_file deletes the whole file data
3807 * and the inode associated with the file.
3808 * It does not delete the links associated with the file.
3810 static int yaffs_unlink_file_if_needed(struct yaffs_obj
*in
)
3814 struct yaffs_dev
*dev
= in
->my_dev
;
3821 yaffs_change_obj_name(in
, in
->my_dev
->del_dir
,
3822 _Y("deleted"), 0, 0);
3823 yaffs_trace(YAFFS_TRACE_TRACING
,
3824 "yaffs: immediate deletion of file %d",
3827 in
->my_dev
->n_deleted_files
++;
3828 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3829 yaffs_resize_file(in
, 0);
3830 yaffs_soft_del_file(in
);
3833 yaffs_change_obj_name(in
, in
->my_dev
->unlinked_dir
,
3834 _Y("unlinked"), 0, 0);
3839 static int yaffs_del_file(struct yaffs_obj
*in
)
3841 int ret_val
= YAFFS_OK
;
3842 int deleted
; /* Need to cache value on stack if in is freed */
3843 struct yaffs_dev
*dev
= in
->my_dev
;
3845 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3846 yaffs_resize_file(in
, 0);
3848 if (in
->n_data_chunks
> 0) {
3849 /* Use soft deletion if there is data in the file.
3850 * That won't be the case if it has been resized to zero.
3853 ret_val
= yaffs_unlink_file_if_needed(in
);
3855 deleted
= in
->deleted
;
3857 if (ret_val
== YAFFS_OK
&& in
->unlinked
&& !in
->deleted
) {
3860 in
->my_dev
->n_deleted_files
++;
3861 yaffs_soft_del_file(in
);
3863 return deleted
? YAFFS_OK
: YAFFS_FAIL
;
3865 /* The file has no data chunks so we toss it immediately */
3866 yaffs_free_tnode(in
->my_dev
, in
->variant
.file_variant
.top
);
3867 in
->variant
.file_variant
.top
= NULL
;
3868 yaffs_generic_obj_del(in
);
3874 int yaffs_is_non_empty_dir(struct yaffs_obj
*obj
)
3877 obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
) &&
3878 !(list_empty(&obj
->variant
.dir_variant
.children
));
3881 static int yaffs_del_dir(struct yaffs_obj
*obj
)
3883 /* First check that the directory is empty. */
3884 if (yaffs_is_non_empty_dir(obj
))
3887 return yaffs_generic_obj_del(obj
);
3890 static int yaffs_del_symlink(struct yaffs_obj
*in
)
3892 kfree(in
->variant
.symlink_variant
.alias
);
3893 in
->variant
.symlink_variant
.alias
= NULL
;
3895 return yaffs_generic_obj_del(in
);
3898 static int yaffs_del_link(struct yaffs_obj
*in
)
3900 /* remove this hardlink from the list associated with the equivalent
3903 list_del_init(&in
->hard_links
);
3904 return yaffs_generic_obj_del(in
);
3907 int yaffs_del_obj(struct yaffs_obj
*obj
)
3911 switch (obj
->variant_type
) {
3912 case YAFFS_OBJECT_TYPE_FILE
:
3913 ret_val
= yaffs_del_file(obj
);
3915 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3916 if (!list_empty(&obj
->variant
.dir_variant
.dirty
)) {
3917 yaffs_trace(YAFFS_TRACE_BACKGROUND
,
3918 "Remove object %d from dirty directories",
3920 list_del_init(&obj
->variant
.dir_variant
.dirty
);
3922 return yaffs_del_dir(obj
);
3924 case YAFFS_OBJECT_TYPE_SYMLINK
:
3925 ret_val
= yaffs_del_symlink(obj
);
3927 case YAFFS_OBJECT_TYPE_HARDLINK
:
3928 ret_val
= yaffs_del_link(obj
);
3930 case YAFFS_OBJECT_TYPE_SPECIAL
:
3931 ret_val
= yaffs_generic_obj_del(obj
);
3933 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3935 break; /* should not happen. */
3941 static void yaffs_empty_dir_to_dir(struct yaffs_obj
*from_dir
,
3942 struct yaffs_obj
*to_dir
)
3944 struct yaffs_obj
*obj
;
3945 struct list_head
*lh
;
3946 struct list_head
*n
;
3948 list_for_each_safe(lh
, n
, &from_dir
->variant
.dir_variant
.children
) {
3949 obj
= list_entry(lh
, struct yaffs_obj
, siblings
);
3950 yaffs_add_obj_to_dir(to_dir
, obj
);
3954 struct yaffs_obj
*yaffs_retype_obj(struct yaffs_obj
*obj
,
3955 enum yaffs_obj_type type
)
3957 /* Tear down the old variant */
3958 switch (obj
->variant_type
) {
3959 case YAFFS_OBJECT_TYPE_FILE
:
3960 /* Nuke file data */
3961 yaffs_resize_file(obj
, 0);
3962 yaffs_free_tnode(obj
->my_dev
, obj
->variant
.file_variant
.top
);
3963 obj
->variant
.file_variant
.top
= NULL
;
3965 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3966 /* Put the children in lost and found. */
3967 yaffs_empty_dir_to_dir(obj
, obj
->my_dev
->lost_n_found
);
3968 if (!list_empty(&obj
->variant
.dir_variant
.dirty
))
3969 list_del_init(&obj
->variant
.dir_variant
.dirty
);
3971 case YAFFS_OBJECT_TYPE_SYMLINK
:
3972 /* Nuke symplink data */
3973 kfree(obj
->variant
.symlink_variant
.alias
);
3974 obj
->variant
.symlink_variant
.alias
= NULL
;
3976 case YAFFS_OBJECT_TYPE_HARDLINK
:
3977 list_del_init(&obj
->hard_links
);
3983 memset(&obj
->variant
, 0, sizeof(obj
->variant
));
3985 /*Set up new variant if the memset is not enough. */
3987 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3988 INIT_LIST_HEAD(&obj
->variant
.dir_variant
.children
);
3989 INIT_LIST_HEAD(&obj
->variant
.dir_variant
.dirty
);
3991 case YAFFS_OBJECT_TYPE_FILE
:
3992 case YAFFS_OBJECT_TYPE_SYMLINK
:
3993 case YAFFS_OBJECT_TYPE_HARDLINK
:
3998 obj
->variant_type
= type
;
4004 static int yaffs_unlink_worker(struct yaffs_obj
*obj
)
4014 yaffs_update_parent(obj
->parent
);
4016 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
4017 return yaffs_del_link(obj
);
4018 } else if (!list_empty(&obj
->hard_links
)) {
4019 /* Curve ball: We're unlinking an object that has a hardlink.
4021 * This problem arises because we are not strictly following
4022 * The Linux link/inode model.
4024 * We can't really delete the object.
4025 * Instead, we do the following:
4026 * - Select a hardlink.
4027 * - Unhook it from the hard links
4028 * - Move it from its parent directory so that the rename works.
4029 * - Rename the object to the hardlink's name.
4030 * - Delete the hardlink
4033 struct yaffs_obj
*hl
;
4034 struct yaffs_obj
*parent
;
4036 YCHAR name
[YAFFS_MAX_NAME_LENGTH
+ 1];
4038 hl
= list_entry(obj
->hard_links
.next
, struct yaffs_obj
,
4041 yaffs_get_obj_name(hl
, name
, YAFFS_MAX_NAME_LENGTH
+ 1);
4042 parent
= hl
->parent
;
4044 list_del_init(&hl
->hard_links
);
4046 yaffs_add_obj_to_dir(obj
->my_dev
->unlinked_dir
, hl
);
4048 ret_val
= yaffs_change_obj_name(obj
, parent
, name
, 0, 0);
4050 if (ret_val
== YAFFS_OK
)
4051 ret_val
= yaffs_generic_obj_del(hl
);
4055 } else if (del_now
) {
4056 switch (obj
->variant_type
) {
4057 case YAFFS_OBJECT_TYPE_FILE
:
4058 return yaffs_del_file(obj
);
4060 case YAFFS_OBJECT_TYPE_DIRECTORY
:
4061 list_del_init(&obj
->variant
.dir_variant
.dirty
);
4062 return yaffs_del_dir(obj
);
4064 case YAFFS_OBJECT_TYPE_SYMLINK
:
4065 return yaffs_del_symlink(obj
);
4067 case YAFFS_OBJECT_TYPE_SPECIAL
:
4068 return yaffs_generic_obj_del(obj
);
4070 case YAFFS_OBJECT_TYPE_HARDLINK
:
4071 case YAFFS_OBJECT_TYPE_UNKNOWN
:
4075 } else if (yaffs_is_non_empty_dir(obj
)) {
4078 return yaffs_change_obj_name(obj
, obj
->my_dev
->unlinked_dir
,
4079 _Y("unlinked"), 0, 0);
4083 static int yaffs_unlink_obj(struct yaffs_obj
*obj
)
4085 if (obj
&& obj
->unlink_allowed
)
4086 return yaffs_unlink_worker(obj
);
4091 int yaffs_unlinker(struct yaffs_obj
*dir
, const YCHAR
*name
)
4093 struct yaffs_obj
*obj
;
4095 obj
= yaffs_find_by_name(dir
, name
);
4096 return yaffs_unlink_obj(obj
);
4100 * If old_name is NULL then we take old_dir as the object to be renamed.
4102 int yaffs_rename_obj(struct yaffs_obj
*old_dir
, const YCHAR
*old_name
,
4103 struct yaffs_obj
*new_dir
, const YCHAR
*new_name
)
4105 struct yaffs_obj
*obj
= NULL
;
4106 struct yaffs_obj
*existing_target
= NULL
;
4109 struct yaffs_dev
*dev
;
4111 if (!old_dir
|| old_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4115 if (!new_dir
|| new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4120 dev
= old_dir
->my_dev
;
4122 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4123 /* Special case for case insemsitive systems.
4124 * While look-up is case insensitive, the name isn't.
4125 * Therefore we might want to change x.txt to X.txt
4127 if (old_dir
== new_dir
&&
4128 old_name
&& new_name
&&
4129 strcmp(old_name
, new_name
) == 0)
4133 if (strnlen(new_name
, YAFFS_MAX_NAME_LENGTH
+ 1) >
4134 YAFFS_MAX_NAME_LENGTH
)
4139 obj
= yaffs_find_by_name(old_dir
, old_name
);
4142 old_dir
= obj
->parent
;
4145 if (obj
&& obj
->rename_allowed
) {
4146 /* Now handle an existing target, if there is one */
4147 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
4148 if (yaffs_is_non_empty_dir(existing_target
)) {
4149 return YAFFS_FAIL
; /* ENOTEMPTY */
4150 } else if (existing_target
&& existing_target
!= obj
) {
4151 /* Nuke the target first, using shadowing,
4152 * but only if it isn't the same object.
4154 * Note we must disable gc here otherwise it can mess
4158 dev
->gc_disable
= 1;
4159 yaffs_change_obj_name(obj
, new_dir
, new_name
, force
,
4160 existing_target
->obj_id
);
4161 existing_target
->is_shadowed
= 1;
4162 yaffs_unlink_obj(existing_target
);
4163 dev
->gc_disable
= 0;
4166 result
= yaffs_change_obj_name(obj
, new_dir
, new_name
, 1, 0);
4168 yaffs_update_parent(old_dir
);
4169 if (new_dir
!= old_dir
)
4170 yaffs_update_parent(new_dir
);
4177 /*----------------------- Initialisation Scanning ---------------------- */
4179 void yaffs_handle_shadowed_obj(struct yaffs_dev
*dev
, int obj_id
,
4180 int backward_scanning
)
4182 struct yaffs_obj
*obj
;
4184 if (backward_scanning
) {
4185 /* Handle YAFFS2 case (backward scanning)
4186 * If the shadowed object exists then ignore.
4188 obj
= yaffs_find_by_number(dev
, obj_id
);
4193 /* Let's create it (if it does not exist) assuming it is a file so that
4194 * it can do shrinking etc.
4195 * We put it in unlinked dir to be cleaned up after the scanning
4198 yaffs_find_or_create_by_number(dev
, obj_id
, YAFFS_OBJECT_TYPE_FILE
);
4201 obj
->is_shadowed
= 1;
4202 yaffs_add_obj_to_dir(dev
->unlinked_dir
, obj
);
4203 obj
->variant
.file_variant
.shrink_size
= 0;
4204 obj
->valid
= 1; /* So that we don't read any other info. */
4207 void yaffs_link_fixup(struct yaffs_dev
*dev
, struct list_head
*hard_list
)
4209 struct list_head
*lh
;
4210 struct list_head
*save
;
4211 struct yaffs_obj
*hl
;
4212 struct yaffs_obj
*in
;
4214 list_for_each_safe(lh
, save
, hard_list
) {
4215 hl
= list_entry(lh
, struct yaffs_obj
, hard_links
);
4216 in
= yaffs_find_by_number(dev
,
4217 hl
->variant
.hardlink_variant
.equiv_id
);
4220 /* Add the hardlink pointers */
4221 hl
->variant
.hardlink_variant
.equiv_obj
= in
;
4222 list_add(&hl
->hard_links
, &in
->hard_links
);
4224 /* Todo Need to report/handle this better.
4225 * Got a problem... hardlink to a non-existant object
4227 hl
->variant
.hardlink_variant
.equiv_obj
= NULL
;
4228 INIT_LIST_HEAD(&hl
->hard_links
);
4233 static void yaffs_strip_deleted_objs(struct yaffs_dev
*dev
)
4236 * Sort out state of unlinked and deleted objects after scanning.
4238 struct list_head
*i
;
4239 struct list_head
*n
;
4240 struct yaffs_obj
*l
;
4245 /* Soft delete all the unlinked files */
4246 list_for_each_safe(i
, n
,
4247 &dev
->unlinked_dir
->variant
.dir_variant
.children
) {
4248 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4252 list_for_each_safe(i
, n
, &dev
->del_dir
->variant
.dir_variant
.children
) {
4253 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4259 * This code iterates through all the objects making sure that they are rooted.
4260 * Any unrooted objects are re-rooted in lost+found.
4261 * An object needs to be in one of:
4262 * - Directly under deleted, unlinked
4263 * - Directly or indirectly under root.
4266 * This code assumes that we don't ever change the current relationships
4267 * between directories:
4268 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4269 * lost-n-found->parent == root_dir
4271 * This fixes the problem where directories might have inadvertently been
4272 * deleted leaving the object "hanging" without being rooted in the
4276 static int yaffs_has_null_parent(struct yaffs_dev
*dev
, struct yaffs_obj
*obj
)
4278 return (obj
== dev
->del_dir
||
4279 obj
== dev
->unlinked_dir
|| obj
== dev
->root_dir
);
4282 static void yaffs_fix_hanging_objs(struct yaffs_dev
*dev
)
4284 struct yaffs_obj
*obj
;
4285 struct yaffs_obj
*parent
;
4287 struct list_head
*lh
;
4288 struct list_head
*n
;
4295 /* Iterate through the objects in each hash entry,
4296 * looking at each object.
4297 * Make sure it is rooted.
4300 for (i
= 0; i
< YAFFS_NOBJECT_BUCKETS
; i
++) {
4301 list_for_each_safe(lh
, n
, &dev
->obj_bucket
[i
].list
) {
4302 obj
= list_entry(lh
, struct yaffs_obj
, hash_link
);
4303 parent
= obj
->parent
;
4305 if (yaffs_has_null_parent(dev
, obj
)) {
4306 /* These directories are not hanging */
4308 } else if (!parent
||
4309 parent
->variant_type
!=
4310 YAFFS_OBJECT_TYPE_DIRECTORY
) {
4312 } else if (yaffs_has_null_parent(dev
, parent
)) {
4316 * Need to follow the parent chain to
4317 * see if it is hanging.
4322 while (parent
!= dev
->root_dir
&&
4324 parent
->parent
->variant_type
==
4325 YAFFS_OBJECT_TYPE_DIRECTORY
&&
4327 parent
= parent
->parent
;
4330 if (parent
!= dev
->root_dir
)
4334 yaffs_trace(YAFFS_TRACE_SCAN
,
4335 "Hanging object %d moved to lost and found",
4337 yaffs_add_obj_to_dir(dev
->lost_n_found
, obj
);
4344 * Delete directory contents for cleaning up lost and found.
4346 static void yaffs_del_dir_contents(struct yaffs_obj
*dir
)
4348 struct yaffs_obj
*obj
;
4349 struct list_head
*lh
;
4350 struct list_head
*n
;
4352 if (dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
4355 list_for_each_safe(lh
, n
, &dir
->variant
.dir_variant
.children
) {
4356 obj
= list_entry(lh
, struct yaffs_obj
, siblings
);
4357 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
)
4358 yaffs_del_dir_contents(obj
);
4359 yaffs_trace(YAFFS_TRACE_SCAN
,
4360 "Deleting lost_found object %d",
4362 yaffs_unlink_obj(obj
);
4366 static void yaffs_empty_l_n_f(struct yaffs_dev
*dev
)
4368 yaffs_del_dir_contents(dev
->lost_n_found
);
4372 struct yaffs_obj
*yaffs_find_by_name(struct yaffs_obj
*directory
,
4376 struct list_head
*i
;
4377 YCHAR buffer
[YAFFS_MAX_NAME_LENGTH
+ 1];
4378 struct yaffs_obj
*l
;
4384 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4385 "tragedy: yaffs_find_by_name: null pointer directory"
4390 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4391 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4392 "tragedy: yaffs_find_by_name: non-directory"
4397 sum
= yaffs_calc_name_sum(name
);
4399 list_for_each(i
, &directory
->variant
.dir_variant
.children
) {
4400 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4402 if (l
->parent
!= directory
)
4405 yaffs_check_obj_details_loaded(l
);
4407 /* Special case for lost-n-found */
4408 if (l
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4409 if (!strcmp(name
, YAFFS_LOSTNFOUND_NAME
))
4411 } else if (l
->sum
== sum
|| l
->hdr_chunk
<= 0) {
4412 /* LostnFound chunk called Objxxx
4415 yaffs_get_obj_name(l
, buffer
,
4416 YAFFS_MAX_NAME_LENGTH
+ 1);
4417 if (!strncmp(name
, buffer
, YAFFS_MAX_NAME_LENGTH
))
4424 /* GetEquivalentObject dereferences any hard links to get to the
4428 struct yaffs_obj
*yaffs_get_equivalent_obj(struct yaffs_obj
*obj
)
4430 if (obj
&& obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
4431 obj
= obj
->variant
.hardlink_variant
.equiv_obj
;
4432 yaffs_check_obj_details_loaded(obj
);
4438 * A note or two on object names.
4439 * * If the object name is missing, we then make one up in the form objnnn
4441 * * ASCII names are stored in the object header's name field from byte zero
4442 * * Unicode names are historically stored starting from byte zero.
4444 * Then there are automatic Unicode names...
4445 * The purpose of these is to save names in a way that can be read as
4446 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4447 * system to share files.
4449 * These automatic unicode are stored slightly differently...
4450 * - If the name can fit in the ASCII character space then they are saved as
4451 * ascii names as per above.
4452 * - If the name needs Unicode then the name is saved in Unicode
4453 * starting at oh->name[1].
4456 static void yaffs_fix_null_name(struct yaffs_obj
*obj
, YCHAR
*name
,
4459 /* Create an object name if we could not find one. */
4460 if (strnlen(name
, YAFFS_MAX_NAME_LENGTH
) == 0) {
4461 YCHAR local_name
[20];
4462 YCHAR num_string
[20];
4463 YCHAR
*x
= &num_string
[19];
4464 unsigned v
= obj
->obj_id
;
4468 *x
= '0' + (v
% 10);
4471 /* make up a name */
4472 strcpy(local_name
, YAFFS_LOSTNFOUND_PREFIX
);
4473 strcat(local_name
, x
);
4474 strncpy(name
, local_name
, buffer_size
- 1);
4478 int yaffs_get_obj_name(struct yaffs_obj
*obj
, YCHAR
*name
, int buffer_size
)
4480 memset(name
, 0, buffer_size
* sizeof(YCHAR
));
4481 yaffs_check_obj_details_loaded(obj
);
4482 if (obj
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4483 strncpy(name
, YAFFS_LOSTNFOUND_NAME
, buffer_size
- 1);
4484 } else if (obj
->short_name
[0]) {
4485 strcpy(name
, obj
->short_name
);
4486 } else if (obj
->hdr_chunk
> 0) {
4488 u8
*buffer
= yaffs_get_temp_buffer(obj
->my_dev
);
4490 struct yaffs_obj_hdr
*oh
= (struct yaffs_obj_hdr
*)buffer
;
4492 memset(buffer
, 0, obj
->my_dev
->data_bytes_per_chunk
);
4494 if (obj
->hdr_chunk
> 0) {
4495 result
= yaffs_rd_chunk_tags_nand(obj
->my_dev
,
4499 yaffs_load_name_from_oh(obj
->my_dev
, name
, oh
->name
,
4502 yaffs_release_temp_buffer(obj
->my_dev
, buffer
);
4505 yaffs_fix_null_name(obj
, name
, buffer_size
);
4507 return strnlen(name
, YAFFS_MAX_NAME_LENGTH
);
4510 loff_t
yaffs_get_obj_length(struct yaffs_obj
*obj
)
4512 /* Dereference any hard linking */
4513 obj
= yaffs_get_equivalent_obj(obj
);
4515 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_FILE
)
4516 return obj
->variant
.file_variant
.file_size
;
4517 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
4518 if (!obj
->variant
.symlink_variant
.alias
)
4520 return strnlen(obj
->variant
.symlink_variant
.alias
,
4521 YAFFS_MAX_ALIAS_LENGTH
);
4523 /* Only a directory should drop through to here */
4524 return obj
->my_dev
->data_bytes_per_chunk
;
4528 int yaffs_get_obj_link_count(struct yaffs_obj
*obj
)
4531 struct list_head
*i
;
4534 count
++; /* the object itself */
4536 list_for_each(i
, &obj
->hard_links
)
4537 count
++; /* add the hard links; */
4542 int yaffs_get_obj_inode(struct yaffs_obj
*obj
)
4544 obj
= yaffs_get_equivalent_obj(obj
);
4549 unsigned yaffs_get_obj_type(struct yaffs_obj
*obj
)
4551 obj
= yaffs_get_equivalent_obj(obj
);
4553 switch (obj
->variant_type
) {
4554 case YAFFS_OBJECT_TYPE_FILE
:
4557 case YAFFS_OBJECT_TYPE_DIRECTORY
:
4560 case YAFFS_OBJECT_TYPE_SYMLINK
:
4563 case YAFFS_OBJECT_TYPE_HARDLINK
:
4566 case YAFFS_OBJECT_TYPE_SPECIAL
:
4567 if (S_ISFIFO(obj
->yst_mode
))
4569 if (S_ISCHR(obj
->yst_mode
))
4571 if (S_ISBLK(obj
->yst_mode
))
4573 if (S_ISSOCK(obj
->yst_mode
))
4583 YCHAR
*yaffs_get_symlink_alias(struct yaffs_obj
*obj
)
4585 obj
= yaffs_get_equivalent_obj(obj
);
4586 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
)
4587 return yaffs_clone_str(obj
->variant
.symlink_variant
.alias
);
4589 return yaffs_clone_str(_Y(""));
4592 /*--------------------------- Initialisation code -------------------------- */
4594 static int yaffs_check_dev_fns(struct yaffs_dev
*dev
)
4596 struct yaffs_driver
*drv
= &dev
->drv
;
4597 struct yaffs_tags_handler
*tagger
= &dev
->tagger
;
4599 /* Common functions, gotta have */
4600 if (!drv
->drv_read_chunk_fn
||
4601 !drv
->drv_write_chunk_fn
||
4605 if (dev
->param
.is_yaffs2
&&
4606 (!drv
->drv_mark_bad_fn
|| !drv
->drv_check_bad_fn
))
4609 /* Install the default tags marshalling functions if needed. */
4610 yaffs_tags_compat_install(dev
);
4611 yaffs_tags_marshall_install(dev
);
4613 /* Check we now have the marshalling functions required. */
4614 if (!tagger
->write_chunk_tags_fn
||
4615 !tagger
->read_chunk_tags_fn
||
4616 !tagger
->query_block_fn
||
4617 !tagger
->mark_bad_fn
)
4623 static int yaffs_create_initial_dir(struct yaffs_dev
*dev
)
4625 /* Initialise the unlinked, deleted, root and lost+found directories */
4626 dev
->lost_n_found
= dev
->root_dir
= NULL
;
4627 dev
->unlinked_dir
= dev
->del_dir
= NULL
;
4629 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_UNLINKED
, S_IFDIR
);
4631 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_DELETED
, S_IFDIR
);
4633 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_ROOT
,
4634 YAFFS_ROOT_MODE
| S_IFDIR
);
4636 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_LOSTNFOUND
,
4637 YAFFS_LOSTNFOUND_MODE
| S_IFDIR
);
4639 if (dev
->lost_n_found
&& dev
->root_dir
&& dev
->unlinked_dir
4641 yaffs_add_obj_to_dir(dev
->root_dir
, dev
->lost_n_found
);
4648 * Typically only used by yaffs_guts_initialise, but also used by the
4649 * Low level yaffs driver tests.
4652 int yaffs_guts_ll_init(struct yaffs_dev
*dev
)
4656 yaffs_trace(YAFFS_TRACE_TRACING
, "yaffs: yaffs_ll_init()");
4659 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4660 "yaffs: Need a device"
4668 dev
->internal_start_block
= dev
->param
.start_block
;
4669 dev
->internal_end_block
= dev
->param
.end_block
;
4670 dev
->block_offset
= 0;
4671 dev
->chunk_offset
= 0;
4672 dev
->n_free_chunks
= 0;
4676 if (dev
->param
.start_block
== 0) {
4677 dev
->internal_start_block
= dev
->param
.start_block
+ 1;
4678 dev
->internal_end_block
= dev
->param
.end_block
+ 1;
4679 dev
->block_offset
= 1;
4680 dev
->chunk_offset
= dev
->param
.chunks_per_block
;
4683 /* Check geometry parameters. */
4685 if ((!dev
->param
.inband_tags
&& dev
->param
.is_yaffs2
&&
4686 dev
->param
.total_bytes_per_chunk
< 1024) ||
4687 (!dev
->param
.is_yaffs2
&&
4688 dev
->param
.total_bytes_per_chunk
< 512) ||
4689 (dev
->param
.inband_tags
&& !dev
->param
.is_yaffs2
) ||
4690 dev
->param
.chunks_per_block
< 2 ||
4691 dev
->param
.n_reserved_blocks
< 2 ||
4692 dev
->internal_start_block
<= 0 ||
4693 dev
->internal_end_block
<= 0 ||
4694 dev
->internal_end_block
<=
4695 (dev
->internal_start_block
+ dev
->param
.n_reserved_blocks
+ 2)
4697 /* otherwise it is too small */
4698 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4699 "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4700 dev
->param
.total_bytes_per_chunk
,
4701 dev
->param
.is_yaffs2
? "2" : "",
4702 dev
->param
.inband_tags
);
4706 /* Sort out space for inband tags, if required */
4707 if (dev
->param
.inband_tags
)
4708 dev
->data_bytes_per_chunk
=
4709 dev
->param
.total_bytes_per_chunk
-
4710 sizeof(struct yaffs_packed_tags2_tags_only
);
4712 dev
->data_bytes_per_chunk
= dev
->param
.total_bytes_per_chunk
;
4714 /* Got the right mix of functions? */
4715 if (!yaffs_check_dev_fns(dev
)) {
4716 /* Function missing */
4717 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4718 "device function(s) missing or wrong");
4723 if (yaffs_init_nand(dev
) != YAFFS_OK
) {
4724 yaffs_trace(YAFFS_TRACE_ALWAYS
, "InitialiseNAND failed");
4732 int yaffs_guts_format_dev(struct yaffs_dev
*dev
)
4735 enum yaffs_block_state state
;
4738 if(yaffs_guts_ll_init(dev
) != YAFFS_OK
)
4744 for (i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
4745 yaffs_query_init_block_state(dev
, i
, &state
, &dummy
);
4746 if (state
!= YAFFS_BLOCK_STATE_DEAD
)
4747 yaffs_erase_block(dev
, i
);
4754 int yaffs_guts_initialise(struct yaffs_dev
*dev
)
4756 int init_failed
= 0;
4760 if(yaffs_guts_ll_init(dev
) != YAFFS_OK
)
4763 if (dev
->is_mounted
) {
4764 yaffs_trace(YAFFS_TRACE_ALWAYS
, "device already mounted");
4768 dev
->is_mounted
= 1;
4770 /* OK now calculate a few things for the device */
4773 * Calculate all the chunk size manipulation numbers:
4775 x
= dev
->data_bytes_per_chunk
;
4776 /* We always use dev->chunk_shift and dev->chunk_div */
4777 dev
->chunk_shift
= calc_shifts(x
);
4778 x
>>= dev
->chunk_shift
;
4780 /* We only use chunk mask if chunk_div is 1 */
4781 dev
->chunk_mask
= (1 << dev
->chunk_shift
) - 1;
4784 * Calculate chunk_grp_bits.
4785 * We need to find the next power of 2 > than internal_end_block
4788 x
= dev
->param
.chunks_per_block
* (dev
->internal_end_block
+ 1);
4790 bits
= calc_shifts_ceiling(x
);
4792 /* Set up tnode width if wide tnodes are enabled. */
4793 if (!dev
->param
.wide_tnodes_disabled
) {
4794 /* bits must be even so that we end up with 32-bit words */
4798 dev
->tnode_width
= 16;
4800 dev
->tnode_width
= bits
;
4802 dev
->tnode_width
= 16;
4805 dev
->tnode_mask
= (1 << dev
->tnode_width
) - 1;
4807 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4808 * so if the bitwidth of the
4809 * chunk range we're using is greater than 16 we need
4810 * to figure out chunk shift and chunk_grp_size
4813 if (bits
<= dev
->tnode_width
)
4814 dev
->chunk_grp_bits
= 0;
4816 dev
->chunk_grp_bits
= bits
- dev
->tnode_width
;
4818 dev
->tnode_size
= (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8;
4819 if (dev
->tnode_size
< sizeof(struct yaffs_tnode
))
4820 dev
->tnode_size
= sizeof(struct yaffs_tnode
);
4822 dev
->chunk_grp_size
= 1 << dev
->chunk_grp_bits
;
4824 if (dev
->param
.chunks_per_block
< dev
->chunk_grp_size
) {
4825 /* We have a problem because the soft delete won't work if
4826 * the chunk group size > chunks per block.
4827 * This can be remedied by using larger "virtual blocks".
4829 yaffs_trace(YAFFS_TRACE_ALWAYS
, "chunk group too large");
4834 /* Finished verifying the device, continue with initialisation */
4836 /* More device initialisation */
4838 dev
->passive_gc_count
= 0;
4839 dev
->oldest_dirty_gc_count
= 0;
4841 dev
->gc_block_finder
= 0;
4842 dev
->buffered_block
= -1;
4843 dev
->doing_buffered_block_rewrite
= 0;
4844 dev
->n_deleted_files
= 0;
4845 dev
->n_bg_deletions
= 0;
4846 dev
->n_unlinked_files
= 0;
4847 dev
->n_ecc_fixed
= 0;
4848 dev
->n_ecc_unfixed
= 0;
4849 dev
->n_tags_ecc_fixed
= 0;
4850 dev
->n_tags_ecc_unfixed
= 0;
4851 dev
->n_erase_failures
= 0;
4852 dev
->n_erased_blocks
= 0;
4853 dev
->gc_disable
= 0;
4854 dev
->has_pending_prioritised_gc
= 1;
4855 /* Assume the worst for now, will get fixed on first GC */
4856 INIT_LIST_HEAD(&dev
->dirty_dirs
);
4857 dev
->oldest_dirty_seq
= 0;
4858 dev
->oldest_dirty_block
= 0;
4860 /* Initialise temporary buffers and caches. */
4861 if (!yaffs_init_tmp_buffers(dev
))
4865 dev
->gc_cleanup_list
= NULL
;
4867 if (!init_failed
&& dev
->param
.n_caches
> 0) {
4871 dev
->param
.n_caches
* sizeof(struct yaffs_cache
);
4873 if (dev
->param
.n_caches
> YAFFS_MAX_SHORT_OP_CACHES
)
4874 dev
->param
.n_caches
= YAFFS_MAX_SHORT_OP_CACHES
;
4876 dev
->cache
= kmalloc(cache_bytes
, GFP_NOFS
);
4878 buf
= (u8
*) dev
->cache
;
4881 memset(dev
->cache
, 0, cache_bytes
);
4883 for (i
= 0; i
< dev
->param
.n_caches
&& buf
; i
++) {
4884 dev
->cache
[i
].object
= NULL
;
4885 dev
->cache
[i
].last_use
= 0;
4886 dev
->cache
[i
].dirty
= 0;
4887 dev
->cache
[i
].data
= buf
=
4888 kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
4893 dev
->cache_last_use
= 0;
4896 dev
->cache_hits
= 0;
4899 dev
->gc_cleanup_list
=
4900 kmalloc(dev
->param
.chunks_per_block
* sizeof(u32
),
4902 if (!dev
->gc_cleanup_list
)
4906 if (dev
->param
.is_yaffs2
)
4907 dev
->param
.use_header_file_size
= 1;
4909 if (!init_failed
&& !yaffs_init_blocks(dev
))
4912 yaffs_init_tnodes_and_objs(dev
);
4914 if (!init_failed
&& !yaffs_create_initial_dir(dev
))
4917 if (!init_failed
&& dev
->param
.is_yaffs2
&&
4918 !dev
->param
.disable_summary
&&
4919 !yaffs_summary_init(dev
))
4923 /* Now scan the flash. */
4924 if (dev
->param
.is_yaffs2
) {
4925 if (yaffs2_checkpt_restore(dev
)) {
4926 yaffs_check_obj_details_loaded(dev
->root_dir
);
4927 yaffs_trace(YAFFS_TRACE_CHECKPOINT
|
4929 "yaffs: restored from checkpoint"
4933 /* Clean up the mess caused by an aborted
4934 * checkpoint load then scan backwards.
4936 yaffs_deinit_blocks(dev
);
4938 yaffs_deinit_tnodes_and_objs(dev
);
4940 dev
->n_erased_blocks
= 0;
4941 dev
->n_free_chunks
= 0;
4942 dev
->alloc_block
= -1;
4943 dev
->alloc_page
= -1;
4944 dev
->n_deleted_files
= 0;
4945 dev
->n_unlinked_files
= 0;
4946 dev
->n_bg_deletions
= 0;
4948 if (!init_failed
&& !yaffs_init_blocks(dev
))
4951 yaffs_init_tnodes_and_objs(dev
);
4954 && !yaffs_create_initial_dir(dev
))
4957 if (!init_failed
&& !yaffs2_scan_backwards(dev
))
4960 } else if (!yaffs1_scan(dev
)) {
4964 yaffs_strip_deleted_objs(dev
);
4965 yaffs_fix_hanging_objs(dev
);
4966 if (dev
->param
.empty_lost_n_found
)
4967 yaffs_empty_l_n_f(dev
);
4971 /* Clean up the mess */
4972 yaffs_trace(YAFFS_TRACE_TRACING
,
4973 "yaffs: yaffs_guts_initialise() aborted.");
4975 yaffs_deinitialise(dev
);
4979 /* Zero out stats */
4980 dev
->n_page_reads
= 0;
4981 dev
->n_page_writes
= 0;
4982 dev
->n_erasures
= 0;
4983 dev
->n_gc_copies
= 0;
4984 dev
->n_retried_writes
= 0;
4986 dev
->n_retired_blocks
= 0;
4988 yaffs_verify_free_chunks(dev
);
4989 yaffs_verify_blocks(dev
);
4991 /* Clean up any aborted checkpoint data */
4992 if (!dev
->is_checkpointed
&& dev
->blocks_in_checkpt
> 0)
4993 yaffs2_checkpt_invalidate(dev
);
4995 yaffs_trace(YAFFS_TRACE_TRACING
,
4996 "yaffs: yaffs_guts_initialise() done.");
5000 void yaffs_deinitialise(struct yaffs_dev
*dev
)
5002 if (dev
->is_mounted
) {
5005 yaffs_deinit_blocks(dev
);
5006 yaffs_deinit_tnodes_and_objs(dev
);
5007 yaffs_summary_deinit(dev
);
5009 if (dev
->param
.n_caches
> 0 && dev
->cache
) {
5011 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
5012 kfree(dev
->cache
[i
].data
);
5013 dev
->cache
[i
].data
= NULL
;
5020 kfree(dev
->gc_cleanup_list
);
5022 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
5023 kfree(dev
->temp_buffer
[i
].buffer
);
5024 dev
->temp_buffer
[i
].buffer
= NULL
;
5027 kfree(dev
->checkpt_buffer
);
5028 dev
->checkpt_buffer
= NULL
;
5029 kfree(dev
->checkpt_block_list
);
5030 dev
->checkpt_block_list
= NULL
;
5032 dev
->is_mounted
= 0;
5034 yaffs_deinit_nand(dev
);
5038 int yaffs_count_free_chunks(struct yaffs_dev
*dev
)
5042 struct yaffs_block_info
*blk
;
5044 blk
= dev
->block_info
;
5045 for (b
= dev
->internal_start_block
; b
<= dev
->internal_end_block
; b
++) {
5046 switch (blk
->block_state
) {
5047 case YAFFS_BLOCK_STATE_EMPTY
:
5048 case YAFFS_BLOCK_STATE_ALLOCATING
:
5049 case YAFFS_BLOCK_STATE_COLLECTING
:
5050 case YAFFS_BLOCK_STATE_FULL
:
5052 (dev
->param
.chunks_per_block
- blk
->pages_in_use
+
5053 blk
->soft_del_pages
);
5063 int yaffs_get_n_free_chunks(struct yaffs_dev
*dev
)
5065 /* This is what we report to the outside world */
5068 int blocks_for_checkpt
;
5071 n_free
= dev
->n_free_chunks
;
5072 n_free
+= dev
->n_deleted_files
;
5074 /* Now count and subtract the number of dirty chunks in the cache. */
5076 for (n_dirty_caches
= 0, i
= 0; i
< dev
->param
.n_caches
; i
++) {
5077 if (dev
->cache
[i
].dirty
)
5081 n_free
-= n_dirty_caches
;
5084 ((dev
->param
.n_reserved_blocks
+ 1) * dev
->param
.chunks_per_block
);
5086 /* Now figure checkpoint space and report that... */
5087 blocks_for_checkpt
= yaffs_calc_checkpt_blocks_required(dev
);
5089 n_free
-= (blocks_for_checkpt
* dev
->param
.chunks_per_block
);
5100 * Marshalling functions to get loff_t file sizes into and out of
5103 void yaffs_oh_size_load(struct yaffs_obj_hdr
*oh
, loff_t fsize
)
5105 oh
->file_size_low
= (fsize
& 0xFFFFFFFF);
5106 oh
->file_size_high
= ((fsize
>> 32) & 0xFFFFFFFF);
5109 loff_t
yaffs_oh_to_size(struct yaffs_obj_hdr
*oh
)
5113 if (sizeof(loff_t
) >= 8 && ~(oh
->file_size_high
))
5114 retval
= (((loff_t
) oh
->file_size_high
) << 32) |
5115 (((loff_t
) oh
->file_size_low
) & 0xFFFFFFFF);
5117 retval
= (loff_t
) oh
->file_size_low
;
5123 void yaffs_count_blocks_by_state(struct yaffs_dev
*dev
, int bs
[10])
5126 struct yaffs_block_info
*bi
;
5129 for(i
= 0; i
< 10; i
++)
5132 for(i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
5133 bi
= yaffs_get_block_info(dev
, i
);
5134 s
= bi
->block_state
;
5135 if(s
> YAFFS_BLOCK_STATE_DEAD
|| s
< YAFFS_BLOCK_STATE_UNKNOWN
)