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_nand.h"
21 #include "yaffs_yaffs1.h"
22 #include "yaffs_yaffs2.h"
23 #include "yaffs_bitmap.h"
24 #include "yaffs_verify.h"
25 #include "yaffs_nand.h"
26 #include "yaffs_packedtags2.h"
27 #include "yaffs_nameval.h"
28 #include "yaffs_allocator.h"
29 #include "yaffs_attribs.h"
30 #include "yaffs_summary.h"
32 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
33 #define YAFFS_GC_GOOD_ENOUGH 2
34 #define YAFFS_GC_PASSIVE_THRESHOLD 4
36 #include "yaffs_ecc.h"
38 /* Forward declarations */
40 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
41 const u8
*buffer
, int n_bytes
, int use_reserve
);
45 /* Function to calculate chunk and offset */
47 void yaffs_addr_to_chunk(struct yaffs_dev
*dev
, loff_t addr
,
48 int *chunk_out
, u32
*offset_out
)
53 chunk
= (u32
) (addr
>> dev
->chunk_shift
);
55 if (dev
->chunk_div
== 1) {
56 /* easy power of 2 case */
57 offset
= (u32
) (addr
& dev
->chunk_mask
);
59 /* Non power-of-2 case */
63 chunk
/= dev
->chunk_div
;
65 chunk_base
= ((loff_t
) chunk
) * dev
->data_bytes_per_chunk
;
66 offset
= (u32
) (addr
- chunk_base
);
73 /* Function to return the number of shifts for a power of 2 greater than or
74 * equal to the given number
75 * Note we don't try to cater for all possible numbers and this does not have to
76 * be hellishly efficient.
79 static inline u32
calc_shifts_ceiling(u32 x
)
84 shifts
= extra_bits
= 0;
99 /* Function to return the number of shifts to get a 1 in bit 0
102 static inline u32
calc_shifts(u32 x
)
120 * Temporary buffer manipulations.
123 static int yaffs_init_tmp_buffers(struct yaffs_dev
*dev
)
128 memset(dev
->temp_buffer
, 0, sizeof(dev
->temp_buffer
));
130 for (i
= 0; buf
&& i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
131 dev
->temp_buffer
[i
].in_use
= 0;
132 buf
= kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
133 dev
->temp_buffer
[i
].buffer
= buf
;
136 return buf
? YAFFS_OK
: YAFFS_FAIL
;
139 u8
*yaffs_get_temp_buffer(struct yaffs_dev
* dev
)
144 if (dev
->temp_in_use
> dev
->max_temp
)
145 dev
->max_temp
= dev
->temp_in_use
;
147 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
148 if (dev
->temp_buffer
[i
].in_use
== 0) {
149 dev
->temp_buffer
[i
].in_use
= 1;
150 return dev
->temp_buffer
[i
].buffer
;
154 yaffs_trace(YAFFS_TRACE_BUFFERS
, "Out of temp buffers");
156 * If we got here then we have to allocate an unmanaged one
160 dev
->unmanaged_buffer_allocs
++;
161 return kmalloc(dev
->data_bytes_per_chunk
, GFP_NOFS
);
165 void yaffs_release_temp_buffer(struct yaffs_dev
*dev
, u8
*buffer
)
171 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
172 if (dev
->temp_buffer
[i
].buffer
== buffer
) {
173 dev
->temp_buffer
[i
].in_use
= 0;
179 /* assume it is an unmanaged one. */
180 yaffs_trace(YAFFS_TRACE_BUFFERS
,
181 "Releasing unmanaged temp buffer");
183 dev
->unmanaged_buffer_deallocs
++;
189 * Determine if we have a managed buffer.
191 int yaffs_is_managed_tmp_buffer(struct yaffs_dev
*dev
, const u8
*buffer
)
195 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
196 if (dev
->temp_buffer
[i
].buffer
== buffer
)
200 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
201 if (dev
->cache
[i
].data
== buffer
)
205 if (buffer
== dev
->checkpt_buffer
)
208 yaffs_trace(YAFFS_TRACE_ALWAYS
,
209 "yaffs: unmaged buffer detected.");
214 * Functions for robustisizing TODO
218 static void yaffs_handle_chunk_wr_ok(struct yaffs_dev
*dev
, int nand_chunk
,
220 const struct yaffs_ext_tags
*tags
)
224 static void yaffs_handle_chunk_update(struct yaffs_dev
*dev
, int nand_chunk
,
225 const struct yaffs_ext_tags
*tags
)
229 void yaffs_handle_chunk_error(struct yaffs_dev
*dev
,
230 struct yaffs_block_info
*bi
)
232 if (!bi
->gc_prioritise
) {
233 bi
->gc_prioritise
= 1;
234 dev
->has_pending_prioritised_gc
= 1;
235 bi
->chunk_error_strikes
++;
237 if (bi
->chunk_error_strikes
> 3) {
238 bi
->needs_retiring
= 1; /* Too many stikes, so retire */
239 yaffs_trace(YAFFS_TRACE_ALWAYS
,
240 "yaffs: Block struck out");
246 static void yaffs_handle_chunk_wr_error(struct yaffs_dev
*dev
, int nand_chunk
,
249 int flash_block
= nand_chunk
/ dev
->param
.chunks_per_block
;
250 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
252 yaffs_handle_chunk_error(dev
, bi
);
255 /* Was an actual write failure,
256 * so mark the block for retirement.*/
257 bi
->needs_retiring
= 1;
258 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
259 "**>> Block %d needs retiring", flash_block
);
262 /* Delete the chunk */
263 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
264 yaffs_skip_rest_of_block(dev
);
272 * Simple hash function. Needs to have a reasonable spread
275 static inline int yaffs_hash_fn(int n
)
279 return n
% YAFFS_NOBJECT_BUCKETS
;
283 * Access functions to useful fake objects.
284 * Note that root might have a presence in NAND if permissions are set.
287 struct yaffs_obj
*yaffs_root(struct yaffs_dev
*dev
)
289 return dev
->root_dir
;
292 struct yaffs_obj
*yaffs_lost_n_found(struct yaffs_dev
*dev
)
294 return dev
->lost_n_found
;
298 * Erased NAND checking functions
301 int yaffs_check_ff(u8
*buffer
, int n_bytes
)
303 /* Horrible, slow implementation */
312 static int yaffs_check_chunk_erased(struct yaffs_dev
*dev
, int nand_chunk
)
314 int retval
= YAFFS_OK
;
315 u8
*data
= yaffs_get_temp_buffer(dev
);
316 struct yaffs_ext_tags tags
;
318 yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, data
, &tags
);
320 if (tags
.ecc_result
> YAFFS_ECC_RESULT_NO_ERROR
)
323 if (!yaffs_check_ff(data
, dev
->data_bytes_per_chunk
) ||
325 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
326 "Chunk %d not erased", nand_chunk
);
330 yaffs_release_temp_buffer(dev
, data
);
336 static int yaffs_verify_chunk_written(struct yaffs_dev
*dev
,
339 struct yaffs_ext_tags
*tags
)
341 int retval
= YAFFS_OK
;
342 struct yaffs_ext_tags temp_tags
;
343 u8
*buffer
= yaffs_get_temp_buffer(dev
);
345 yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, buffer
, &temp_tags
);
346 if (memcmp(buffer
, data
, dev
->data_bytes_per_chunk
) ||
347 temp_tags
.obj_id
!= tags
->obj_id
||
348 temp_tags
.chunk_id
!= tags
->chunk_id
||
349 temp_tags
.n_bytes
!= tags
->n_bytes
)
352 yaffs_release_temp_buffer(dev
, buffer
);
358 int yaffs_check_alloc_available(struct yaffs_dev
*dev
, int n_chunks
)
361 int reserved_blocks
= dev
->param
.n_reserved_blocks
;
364 checkpt_blocks
= yaffs_calc_checkpt_blocks_required(dev
);
367 (reserved_blocks
+ checkpt_blocks
) * dev
->param
.chunks_per_block
;
369 return (dev
->n_free_chunks
> (reserved_chunks
+ n_chunks
));
372 static int yaffs_find_alloc_block(struct yaffs_dev
*dev
)
375 struct yaffs_block_info
*bi
;
377 if (dev
->n_erased_blocks
< 1) {
378 /* Hoosterman we've got a problem.
379 * Can't get space to gc
381 yaffs_trace(YAFFS_TRACE_ERROR
,
382 "yaffs tragedy: no more erased blocks");
387 /* Find an empty block. */
389 for (i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
390 dev
->alloc_block_finder
++;
391 if (dev
->alloc_block_finder
< dev
->internal_start_block
392 || dev
->alloc_block_finder
> dev
->internal_end_block
) {
393 dev
->alloc_block_finder
= dev
->internal_start_block
;
396 bi
= yaffs_get_block_info(dev
, dev
->alloc_block_finder
);
398 if (bi
->block_state
== YAFFS_BLOCK_STATE_EMPTY
) {
399 bi
->block_state
= YAFFS_BLOCK_STATE_ALLOCATING
;
401 bi
->seq_number
= dev
->seq_number
;
402 dev
->n_erased_blocks
--;
403 yaffs_trace(YAFFS_TRACE_ALLOCATE
,
404 "Allocated block %d, seq %d, %d left" ,
405 dev
->alloc_block_finder
, dev
->seq_number
,
406 dev
->n_erased_blocks
);
407 return dev
->alloc_block_finder
;
411 yaffs_trace(YAFFS_TRACE_ALWAYS
,
412 "yaffs tragedy: no more erased blocks, but there should have been %d",
413 dev
->n_erased_blocks
);
418 static int yaffs_alloc_chunk(struct yaffs_dev
*dev
, int use_reserver
,
419 struct yaffs_block_info
**block_ptr
)
422 struct yaffs_block_info
*bi
;
424 if (dev
->alloc_block
< 0) {
425 /* Get next block to allocate off */
426 dev
->alloc_block
= yaffs_find_alloc_block(dev
);
430 if (!use_reserver
&& !yaffs_check_alloc_available(dev
, 1)) {
431 /* No space unless we're allowed to use the reserve. */
435 if (dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
436 && dev
->alloc_page
== 0)
437 yaffs_trace(YAFFS_TRACE_ALLOCATE
, "Allocating reserve");
439 /* Next page please.... */
440 if (dev
->alloc_block
>= 0) {
441 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
443 ret_val
= (dev
->alloc_block
* dev
->param
.chunks_per_block
) +
446 yaffs_set_chunk_bit(dev
, dev
->alloc_block
, dev
->alloc_page
);
450 dev
->n_free_chunks
--;
452 /* If the block is full set the state to full */
453 if (dev
->alloc_page
>= dev
->param
.chunks_per_block
) {
454 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
455 dev
->alloc_block
= -1;
464 yaffs_trace(YAFFS_TRACE_ERROR
,
465 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
470 static int yaffs_get_erased_chunks(struct yaffs_dev
*dev
)
474 n
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
476 if (dev
->alloc_block
> 0)
477 n
+= (dev
->param
.chunks_per_block
- dev
->alloc_page
);
484 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
485 * if we don't want to write to it.
487 void yaffs_skip_rest_of_block(struct yaffs_dev
*dev
)
489 struct yaffs_block_info
*bi
;
491 if (dev
->alloc_block
> 0) {
492 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
493 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
) {
494 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
495 dev
->alloc_block
= -1;
500 static int yaffs_write_new_chunk(struct yaffs_dev
*dev
,
502 struct yaffs_ext_tags
*tags
, int use_reserver
)
508 yaffs2_checkpt_invalidate(dev
);
511 struct yaffs_block_info
*bi
= 0;
514 chunk
= yaffs_alloc_chunk(dev
, use_reserver
, &bi
);
520 /* First check this chunk is erased, if it needs
521 * checking. The checking policy (unless forced
522 * always on) is as follows:
524 * Check the first page we try to write in a block.
525 * If the check passes then we don't need to check any
526 * more. If the check fails, we check again...
527 * If the block has been erased, we don't need to check.
529 * However, if the block has been prioritised for gc,
530 * then we think there might be something odd about
531 * this block and stop using it.
533 * Rationale: We should only ever see chunks that have
534 * not been erased if there was a partially written
535 * chunk due to power loss. This checking policy should
536 * catch that case with very few checks and thus save a
537 * lot of checks that are most likely not needed.
540 * If an erase check fails or the write fails we skip the
544 /* let's give it a try */
547 if (dev
->param
.always_check_erased
)
548 bi
->skip_erased_check
= 0;
550 if (!bi
->skip_erased_check
) {
551 erased_ok
= yaffs_check_chunk_erased(dev
, chunk
);
552 if (erased_ok
!= YAFFS_OK
) {
553 yaffs_trace(YAFFS_TRACE_ERROR
,
554 "**>> yaffs chunk %d was not erased",
557 /* If not erased, delete this one,
558 * skip rest of block and
559 * try another chunk */
560 yaffs_chunk_del(dev
, chunk
, 1, __LINE__
);
561 yaffs_skip_rest_of_block(dev
);
566 write_ok
= yaffs_wr_chunk_tags_nand(dev
, chunk
, data
, tags
);
568 if (!bi
->skip_erased_check
)
570 yaffs_verify_chunk_written(dev
, chunk
, data
, tags
);
572 if (write_ok
!= YAFFS_OK
) {
573 /* Clean up aborted write, skip to next block and
574 * try another chunk */
575 yaffs_handle_chunk_wr_error(dev
, chunk
, erased_ok
);
579 bi
->skip_erased_check
= 1;
581 /* Copy the data into the robustification buffer */
582 yaffs_handle_chunk_wr_ok(dev
, chunk
, data
, tags
);
584 } while (write_ok
!= YAFFS_OK
&&
585 (yaffs_wr_attempts
<= 0 || attempts
<= yaffs_wr_attempts
));
591 yaffs_trace(YAFFS_TRACE_ERROR
,
592 "**>> yaffs write required %d attempts",
594 dev
->n_retried_writes
+= (attempts
- 1);
601 * Block retiring for handling a broken block.
604 static void yaffs_retire_block(struct yaffs_dev
*dev
, int flash_block
)
606 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
608 yaffs2_checkpt_invalidate(dev
);
610 yaffs2_clear_oldest_dirty_seq(dev
, bi
);
612 if (yaffs_mark_bad(dev
, flash_block
) != YAFFS_OK
) {
613 if (yaffs_erase_block(dev
, flash_block
) != YAFFS_OK
) {
614 yaffs_trace(YAFFS_TRACE_ALWAYS
,
615 "yaffs: Failed to mark bad and erase block %d",
618 struct yaffs_ext_tags tags
;
620 flash_block
* dev
->param
.chunks_per_block
;
622 u8
*buffer
= yaffs_get_temp_buffer(dev
);
624 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
625 memset(&tags
, 0, sizeof(tags
));
626 tags
.seq_number
= YAFFS_SEQUENCE_BAD_BLOCK
;
627 if (dev
->param
.write_chunk_tags_fn(dev
, chunk_id
-
631 yaffs_trace(YAFFS_TRACE_ALWAYS
,
632 "yaffs: Failed to write bad block marker to block %d",
635 yaffs_release_temp_buffer(dev
, buffer
);
639 bi
->block_state
= YAFFS_BLOCK_STATE_DEAD
;
640 bi
->gc_prioritise
= 0;
641 bi
->needs_retiring
= 0;
643 dev
->n_retired_blocks
++;
646 /*---------------- Name handling functions ------------*/
648 static u16
yaffs_calc_name_sum(const YCHAR
*name
)
656 while ((*name
) && i
< (YAFFS_MAX_NAME_LENGTH
/ 2)) {
658 /* 0x1f mask is case insensitive */
659 sum
+= ((*name
) & 0x1f) * i
;
666 void yaffs_set_obj_name(struct yaffs_obj
*obj
, const YCHAR
* name
)
668 memset(obj
->short_name
, 0, sizeof(obj
->short_name
));
670 yaffs_strnlen(name
, YAFFS_SHORT_NAME_LENGTH
+ 1) <=
671 YAFFS_SHORT_NAME_LENGTH
)
672 yaffs_strcpy(obj
->short_name
, name
);
674 obj
->short_name
[0] = _Y('\0');
675 obj
->sum
= yaffs_calc_name_sum(name
);
678 void yaffs_set_obj_name_from_oh(struct yaffs_obj
*obj
,
679 const struct yaffs_obj_hdr
*oh
)
681 #ifdef CONFIG_YAFFS_AUTO_UNICODE
682 YCHAR tmp_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
683 memset(tmp_name
, 0, sizeof(tmp_name
));
684 yaffs_load_name_from_oh(obj
->my_dev
, tmp_name
, oh
->name
,
685 YAFFS_MAX_NAME_LENGTH
+ 1);
686 yaffs_set_obj_name(obj
, tmp_name
);
688 yaffs_set_obj_name(obj
, oh
->name
);
692 loff_t
yaffs_max_file_size(struct yaffs_dev
*dev
)
694 return ((loff_t
) YAFFS_MAX_CHUNK_ID
) * dev
->data_bytes_per_chunk
;
697 /*-------------------- TNODES -------------------
699 * List of spare tnodes
700 * The list is hooked together using the first pointer
704 struct yaffs_tnode
*yaffs_get_tnode(struct yaffs_dev
*dev
)
706 struct yaffs_tnode
*tn
= yaffs_alloc_raw_tnode(dev
);
709 memset(tn
, 0, dev
->tnode_size
);
713 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
718 /* FreeTnode frees up a tnode and puts it back on the free list */
719 static void yaffs_free_tnode(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
)
721 yaffs_free_raw_tnode(dev
, tn
);
723 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
726 static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev
*dev
)
728 yaffs_deinit_raw_tnodes_and_objs(dev
);
733 void yaffs_load_tnode_0(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
734 unsigned pos
, unsigned val
)
736 u32
*map
= (u32
*) tn
;
742 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
743 val
>>= dev
->chunk_grp_bits
;
745 bit_in_map
= pos
* dev
->tnode_width
;
746 word_in_map
= bit_in_map
/ 32;
747 bit_in_word
= bit_in_map
& (32 - 1);
749 mask
= dev
->tnode_mask
<< bit_in_word
;
751 map
[word_in_map
] &= ~mask
;
752 map
[word_in_map
] |= (mask
& (val
<< bit_in_word
));
754 if (dev
->tnode_width
> (32 - bit_in_word
)) {
755 bit_in_word
= (32 - bit_in_word
);
758 dev
->tnode_mask
>> bit_in_word
;
759 map
[word_in_map
] &= ~mask
;
760 map
[word_in_map
] |= (mask
& (val
>> bit_in_word
));
764 u32
yaffs_get_group_base(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
767 u32
*map
= (u32
*) tn
;
773 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
775 bit_in_map
= pos
* dev
->tnode_width
;
776 word_in_map
= bit_in_map
/ 32;
777 bit_in_word
= bit_in_map
& (32 - 1);
779 val
= map
[word_in_map
] >> bit_in_word
;
781 if (dev
->tnode_width
> (32 - bit_in_word
)) {
782 bit_in_word
= (32 - bit_in_word
);
784 val
|= (map
[word_in_map
] << bit_in_word
);
787 val
&= dev
->tnode_mask
;
788 val
<<= dev
->chunk_grp_bits
;
793 /* ------------------- End of individual tnode manipulation -----------------*/
795 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
796 * The look up tree is represented by the top tnode and the number of top_level
797 * in the tree. 0 means only the level 0 tnode is in the tree.
800 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
801 struct yaffs_tnode
*yaffs_find_tnode_0(struct yaffs_dev
*dev
,
802 struct yaffs_file_var
*file_struct
,
805 struct yaffs_tnode
*tn
= file_struct
->top
;
808 int level
= file_struct
->top_level
;
810 /* Check sane level and chunk Id */
811 if (level
< 0 || level
> YAFFS_TNODES_MAX_LEVEL
)
814 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
817 /* First check we're tall enough (ie enough top_level) */
819 i
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
822 i
>>= YAFFS_TNODES_INTERNAL_BITS
;
826 if (required_depth
> file_struct
->top_level
)
827 return NULL
; /* Not tall enough, so we can't find it */
829 /* Traverse down to level 0 */
830 while (level
> 0 && tn
) {
831 tn
= tn
->internal
[(chunk_id
>>
832 (YAFFS_TNODES_LEVEL0_BITS
+
834 YAFFS_TNODES_INTERNAL_BITS
)) &
835 YAFFS_TNODES_INTERNAL_MASK
];
842 /* add_find_tnode_0 finds the level 0 tnode if it exists,
843 * otherwise first expands the tree.
844 * This happens in two steps:
845 * 1. If the tree isn't tall enough, then make it taller.
846 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
848 * Used when modifying the tree.
850 * If the tn argument is NULL, then a fresh tnode will be added otherwise the
851 * specified tn will be plugged into the ttree.
854 struct yaffs_tnode
*yaffs_add_find_tnode_0(struct yaffs_dev
*dev
,
855 struct yaffs_file_var
*file_struct
,
857 struct yaffs_tnode
*passed_tn
)
862 struct yaffs_tnode
*tn
;
865 /* Check sane level and page Id */
866 if (file_struct
->top_level
< 0 ||
867 file_struct
->top_level
> YAFFS_TNODES_MAX_LEVEL
)
870 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
873 /* First check we're tall enough (ie enough top_level) */
875 x
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
878 x
>>= YAFFS_TNODES_INTERNAL_BITS
;
882 if (required_depth
> file_struct
->top_level
) {
883 /* Not tall enough, gotta make the tree taller */
884 for (i
= file_struct
->top_level
; i
< required_depth
; i
++) {
886 tn
= yaffs_get_tnode(dev
);
889 tn
->internal
[0] = file_struct
->top
;
890 file_struct
->top
= tn
;
891 file_struct
->top_level
++;
893 yaffs_trace(YAFFS_TRACE_ERROR
,
894 "yaffs: no more tnodes");
900 /* Traverse down to level 0, adding anything we need */
902 l
= file_struct
->top_level
;
903 tn
= file_struct
->top
;
906 while (l
> 0 && tn
) {
908 (YAFFS_TNODES_LEVEL0_BITS
+
909 (l
- 1) * YAFFS_TNODES_INTERNAL_BITS
)) &
910 YAFFS_TNODES_INTERNAL_MASK
;
912 if ((l
> 1) && !tn
->internal
[x
]) {
913 /* Add missing non-level-zero tnode */
914 tn
->internal
[x
] = yaffs_get_tnode(dev
);
915 if (!tn
->internal
[x
])
918 /* Looking from level 1 at level 0 */
920 /* If we already have one, release it */
922 yaffs_free_tnode(dev
,
924 tn
->internal
[x
] = passed_tn
;
926 } else if (!tn
->internal
[x
]) {
927 /* Don't have one, none passed in */
928 tn
->internal
[x
] = yaffs_get_tnode(dev
);
929 if (!tn
->internal
[x
])
934 tn
= tn
->internal
[x
];
940 memcpy(tn
, passed_tn
,
941 (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8);
942 yaffs_free_tnode(dev
, passed_tn
);
949 static int yaffs_tags_match(const struct yaffs_ext_tags
*tags
, int obj_id
,
952 return (tags
->chunk_id
== chunk_obj
&&
953 tags
->obj_id
== obj_id
&&
954 !tags
->is_deleted
) ? 1 : 0;
958 static int yaffs_find_chunk_in_group(struct yaffs_dev
*dev
, int the_chunk
,
959 struct yaffs_ext_tags
*tags
, int obj_id
,
964 for (j
= 0; the_chunk
&& j
< dev
->chunk_grp_size
; j
++) {
965 if (yaffs_check_chunk_bit
966 (dev
, the_chunk
/ dev
->param
.chunks_per_block
,
967 the_chunk
% dev
->param
.chunks_per_block
)) {
969 if (dev
->chunk_grp_size
== 1)
972 yaffs_rd_chunk_tags_nand(dev
, the_chunk
, NULL
,
974 if (yaffs_tags_match(tags
,
975 obj_id
, inode_chunk
)) {
986 static int yaffs_find_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
987 struct yaffs_ext_tags
*tags
)
989 /*Get the Tnode, then get the level 0 offset chunk offset */
990 struct yaffs_tnode
*tn
;
992 struct yaffs_ext_tags local_tags
;
994 struct yaffs_dev
*dev
= in
->my_dev
;
997 /* Passed a NULL, so use our own tags space */
1001 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1006 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1008 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1013 static int yaffs_find_del_file_chunk(struct yaffs_obj
*in
, int inode_chunk
,
1014 struct yaffs_ext_tags
*tags
)
1016 /* Get the Tnode, then get the level 0 offset chunk offset */
1017 struct yaffs_tnode
*tn
;
1019 struct yaffs_ext_tags local_tags
;
1020 struct yaffs_dev
*dev
= in
->my_dev
;
1024 /* Passed a NULL, so use our own tags space */
1028 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1033 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1035 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1038 /* Delete the entry in the filestructure (if found) */
1040 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, 0);
1045 int yaffs_put_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
1046 int nand_chunk
, int in_scan
)
1048 /* NB in_scan is zero unless scanning.
1049 * For forward scanning, in_scan is > 0;
1050 * for backward scanning in_scan is < 0
1052 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1055 struct yaffs_tnode
*tn
;
1056 struct yaffs_dev
*dev
= in
->my_dev
;
1058 struct yaffs_ext_tags existing_tags
;
1059 struct yaffs_ext_tags new_tags
;
1060 unsigned existing_serial
, new_serial
;
1062 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
) {
1063 /* Just ignore an attempt at putting a chunk into a non-file
1065 * If it is not during Scanning then something went wrong!
1068 yaffs_trace(YAFFS_TRACE_ERROR
,
1069 "yaffs tragedy:attempt to put data chunk into a non-file"
1074 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1078 tn
= yaffs_add_find_tnode_0(dev
,
1079 &in
->variant
.file_variant
,
1085 /* Dummy insert, bail now */
1088 existing_cunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1091 /* If we're scanning then we need to test for duplicates
1092 * NB This does not need to be efficient since it should only
1093 * happen when the power fails during a write, then only one
1094 * chunk should ever be affected.
1096 * Correction for YAFFS2: This could happen quite a lot and we
1097 * need to think about efficiency! TODO
1098 * Update: For backward scanning we don't need to re-read tags
1099 * so this is quite cheap.
1102 if (existing_cunk
> 0) {
1103 /* NB Right now existing chunk will not be real
1104 * chunk_id if the chunk group size > 1
1105 * thus we have to do a FindChunkInFile to get the
1108 * We have a duplicate now we need to decide which
1111 * Backwards scanning YAFFS2: The old one is what
1112 * we use, dump the new one.
1113 * YAFFS1: Get both sets of tags and compare serial
1118 /* Only do this for forward scanning */
1119 yaffs_rd_chunk_tags_nand(dev
,
1123 /* Do a proper find */
1125 yaffs_find_chunk_in_file(in
, inode_chunk
,
1129 if (existing_cunk
<= 0) {
1130 /*Hoosterman - how did this happen? */
1132 yaffs_trace(YAFFS_TRACE_ERROR
,
1133 "yaffs tragedy: existing chunk < 0 in scan"
1138 /* NB The deleted flags should be false, otherwise
1139 * the chunks will not be loaded during a scan
1143 new_serial
= new_tags
.serial_number
;
1144 existing_serial
= existing_tags
.serial_number
;
1147 if ((in_scan
> 0) &&
1148 (existing_cunk
<= 0 ||
1149 ((existing_serial
+ 1) & 3) == new_serial
)) {
1150 /* Forward scanning.
1152 * Delete the old one and drop through to
1155 yaffs_chunk_del(dev
, existing_cunk
, 1,
1158 /* Backward scanning or we want to use the
1160 * Delete the new one and return early so that
1161 * the tnode isn't changed
1163 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1170 if (existing_cunk
== 0)
1171 in
->n_data_chunks
++;
1173 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, nand_chunk
);
1178 static void yaffs_soft_del_chunk(struct yaffs_dev
*dev
, int chunk
)
1180 struct yaffs_block_info
*the_block
;
1183 yaffs_trace(YAFFS_TRACE_DELETION
, "soft delete chunk %d", chunk
);
1185 block_no
= chunk
/ dev
->param
.chunks_per_block
;
1186 the_block
= yaffs_get_block_info(dev
, block_no
);
1188 the_block
->soft_del_pages
++;
1189 dev
->n_free_chunks
++;
1190 yaffs2_update_oldest_dirty_seq(dev
, block_no
, the_block
);
1194 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1195 * the chunks in the file.
1196 * All soft deleting does is increment the block's softdelete count and pulls
1197 * the chunk out of the tnode.
1198 * Thus, essentially this is the same as DeleteWorker except that the chunks
1202 static int yaffs_soft_del_worker(struct yaffs_obj
*in
, struct yaffs_tnode
*tn
,
1203 u32 level
, int chunk_offset
)
1208 struct yaffs_dev
*dev
= in
->my_dev
;
1214 for (i
= YAFFS_NTNODES_INTERNAL
- 1;
1217 if (tn
->internal
[i
]) {
1219 yaffs_soft_del_worker(in
,
1223 YAFFS_TNODES_INTERNAL_BITS
)
1226 yaffs_free_tnode(dev
,
1228 tn
->internal
[i
] = NULL
;
1230 /* Can this happen? */
1234 return (all_done
) ? 1 : 0;
1238 for (i
= YAFFS_NTNODES_LEVEL0
- 1; i
>= 0; i
--) {
1239 the_chunk
= yaffs_get_group_base(dev
, tn
, i
);
1241 yaffs_soft_del_chunk(dev
, the_chunk
);
1242 yaffs_load_tnode_0(dev
, tn
, i
, 0);
1248 static void yaffs_remove_obj_from_dir(struct yaffs_obj
*obj
)
1250 struct yaffs_dev
*dev
= obj
->my_dev
;
1251 struct yaffs_obj
*parent
;
1253 yaffs_verify_obj_in_dir(obj
);
1254 parent
= obj
->parent
;
1256 yaffs_verify_dir(parent
);
1258 if (dev
&& dev
->param
.remove_obj_fn
)
1259 dev
->param
.remove_obj_fn(obj
);
1261 list_del_init(&obj
->siblings
);
1264 yaffs_verify_dir(parent
);
1267 void yaffs_add_obj_to_dir(struct yaffs_obj
*directory
, struct yaffs_obj
*obj
)
1270 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1271 "tragedy: Trying to add an object to a null pointer directory"
1276 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1277 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1278 "tragedy: Trying to add an object to a non-directory"
1283 if (obj
->siblings
.prev
== NULL
) {
1284 /* Not initialised */
1288 yaffs_verify_dir(directory
);
1290 yaffs_remove_obj_from_dir(obj
);
1293 list_add(&obj
->siblings
, &directory
->variant
.dir_variant
.children
);
1294 obj
->parent
= directory
;
1296 if (directory
== obj
->my_dev
->unlinked_dir
1297 || directory
== obj
->my_dev
->del_dir
) {
1299 obj
->my_dev
->n_unlinked_files
++;
1300 obj
->rename_allowed
= 0;
1303 yaffs_verify_dir(directory
);
1304 yaffs_verify_obj_in_dir(obj
);
1307 static int yaffs_change_obj_name(struct yaffs_obj
*obj
,
1308 struct yaffs_obj
*new_dir
,
1309 const YCHAR
*new_name
, int force
, int shadows
)
1313 struct yaffs_obj
*existing_target
;
1315 if (new_dir
== NULL
)
1316 new_dir
= obj
->parent
; /* use the old directory */
1318 if (new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1319 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1320 "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1325 unlink_op
= (new_dir
== obj
->my_dev
->unlinked_dir
);
1326 del_op
= (new_dir
== obj
->my_dev
->del_dir
);
1328 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
1330 /* If the object is a file going into the unlinked directory,
1331 * then it is OK to just stuff it in since duplicate names are OK.
1332 * else only proceed if the new name does not exist and we're putting
1333 * it into a directory.
1335 if (!(unlink_op
|| del_op
|| force
||
1336 shadows
> 0 || !existing_target
) ||
1337 new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
1340 yaffs_set_obj_name(obj
, new_name
);
1342 yaffs_add_obj_to_dir(new_dir
, obj
);
1347 /* If it is a deletion then we mark it as a shrink for gc */
1348 if (yaffs_update_oh(obj
, new_name
, 0, del_op
, shadows
, NULL
) >= 0)
1354 /*------------------------ Short Operations Cache ------------------------------
1355 * In many situations where there is no high level buffering a lot of
1356 * reads might be short sequential reads, and a lot of writes may be short
1357 * sequential writes. eg. scanning/writing a jpeg file.
1358 * In these cases, a short read/write cache can provide a huge perfomance
1359 * benefit with dumb-as-a-rock code.
1360 * In Linux, the page cache provides read buffering and the short op cache
1361 * provides write buffering.
1363 * There are a small number (~10) of cache chunks per device so that we don't
1364 * need a very intelligent search.
1367 static int yaffs_obj_cache_dirty(struct yaffs_obj
*obj
)
1369 struct yaffs_dev
*dev
= obj
->my_dev
;
1371 struct yaffs_cache
*cache
;
1372 int n_caches
= obj
->my_dev
->param
.n_caches
;
1374 for (i
= 0; i
< n_caches
; i
++) {
1375 cache
= &dev
->cache
[i
];
1376 if (cache
->object
== obj
&& cache
->dirty
)
1383 static void yaffs_flush_file_cache(struct yaffs_obj
*obj
)
1385 struct yaffs_dev
*dev
= obj
->my_dev
;
1386 int lowest
= -99; /* Stop compiler whining. */
1388 struct yaffs_cache
*cache
;
1389 int chunk_written
= 0;
1390 int n_caches
= obj
->my_dev
->param
.n_caches
;
1397 /* Find the lowest dirty chunk for this object */
1398 for (i
= 0; i
< n_caches
; i
++) {
1399 if (dev
->cache
[i
].object
== obj
&&
1400 dev
->cache
[i
].dirty
) {
1402 dev
->cache
[i
].chunk_id
< lowest
) {
1403 cache
= &dev
->cache
[i
];
1404 lowest
= cache
->chunk_id
;
1409 if (cache
&& !cache
->locked
) {
1410 /* Write it out and free it up */
1412 yaffs_wr_data_obj(cache
->object
,
1417 cache
->object
= NULL
;
1419 } while (cache
&& chunk_written
> 0);
1422 /* Hoosterman, disk full while writing cache out. */
1423 yaffs_trace(YAFFS_TRACE_ERROR
,
1424 "yaffs tragedy: no space during cache write");
1427 /*yaffs_flush_whole_cache(dev)
1432 void yaffs_flush_whole_cache(struct yaffs_dev
*dev
)
1434 struct yaffs_obj
*obj
;
1435 int n_caches
= dev
->param
.n_caches
;
1438 /* Find a dirty object in the cache and flush it...
1439 * until there are no further dirty objects.
1443 for (i
= 0; i
< n_caches
&& !obj
; i
++) {
1444 if (dev
->cache
[i
].object
&& dev
->cache
[i
].dirty
)
1445 obj
= dev
->cache
[i
].object
;
1448 yaffs_flush_file_cache(obj
);
1453 /* Grab us a cache chunk for use.
1454 * First look for an empty one.
1455 * Then look for the least recently used non-dirty one.
1456 * Then look for the least recently used dirty one...., flush and look again.
1458 static struct yaffs_cache
*yaffs_grab_chunk_worker(struct yaffs_dev
*dev
)
1462 if (dev
->param
.n_caches
> 0) {
1463 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1464 if (!dev
->cache
[i
].object
)
1465 return &dev
->cache
[i
];
1471 static struct yaffs_cache
*yaffs_grab_chunk_cache(struct yaffs_dev
*dev
)
1473 struct yaffs_cache
*cache
;
1474 struct yaffs_obj
*the_obj
;
1478 if (dev
->param
.n_caches
< 1)
1481 /* Try find a non-dirty one... */
1483 cache
= yaffs_grab_chunk_worker(dev
);
1486 /* They were all dirty, find the LRU object and flush
1487 * its cache, then find again.
1488 * NB what's here is not very accurate,
1489 * we actually flush the object with the LRU chunk.
1492 /* With locking we can't assume we can use entry zero,
1493 * Set the_obj to a valid pointer for Coverity. */
1494 the_obj
= dev
->cache
[0].object
;
1498 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1499 if (dev
->cache
[i
].object
&&
1500 !dev
->cache
[i
].locked
&&
1501 (dev
->cache
[i
].last_use
< usage
||
1503 usage
= dev
->cache
[i
].last_use
;
1504 the_obj
= dev
->cache
[i
].object
;
1505 cache
= &dev
->cache
[i
];
1509 if (!cache
|| cache
->dirty
) {
1510 /* Flush and try again */
1511 yaffs_flush_file_cache(the_obj
);
1512 cache
= yaffs_grab_chunk_worker(dev
);
1518 /* Find a cached chunk */
1519 static struct yaffs_cache
*yaffs_find_chunk_cache(const struct yaffs_obj
*obj
,
1522 struct yaffs_dev
*dev
= obj
->my_dev
;
1525 if (dev
->param
.n_caches
< 1)
1528 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1529 if (dev
->cache
[i
].object
== obj
&&
1530 dev
->cache
[i
].chunk_id
== chunk_id
) {
1533 return &dev
->cache
[i
];
1539 /* Mark the chunk for the least recently used algorithym */
1540 static void yaffs_use_cache(struct yaffs_dev
*dev
, struct yaffs_cache
*cache
,
1545 if (dev
->param
.n_caches
< 1)
1548 if (dev
->cache_last_use
< 0 ||
1549 dev
->cache_last_use
> 100000000) {
1550 /* Reset the cache usages */
1551 for (i
= 1; i
< dev
->param
.n_caches
; i
++)
1552 dev
->cache
[i
].last_use
= 0;
1554 dev
->cache_last_use
= 0;
1556 dev
->cache_last_use
++;
1557 cache
->last_use
= dev
->cache_last_use
;
1563 /* Invalidate a single cache page.
1564 * Do this when a whole page gets written,
1565 * ie the short cache for this page is no longer valid.
1567 static void yaffs_invalidate_chunk_cache(struct yaffs_obj
*object
, int chunk_id
)
1569 struct yaffs_cache
*cache
;
1571 if (object
->my_dev
->param
.n_caches
> 0) {
1572 cache
= yaffs_find_chunk_cache(object
, chunk_id
);
1575 cache
->object
= NULL
;
1579 /* Invalidate all the cache pages associated with this object
1580 * Do this whenever ther file is deleted or resized.
1582 static void yaffs_invalidate_whole_cache(struct yaffs_obj
*in
)
1585 struct yaffs_dev
*dev
= in
->my_dev
;
1587 if (dev
->param
.n_caches
> 0) {
1588 /* Invalidate it. */
1589 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1590 if (dev
->cache
[i
].object
== in
)
1591 dev
->cache
[i
].object
= NULL
;
1596 static void yaffs_unhash_obj(struct yaffs_obj
*obj
)
1599 struct yaffs_dev
*dev
= obj
->my_dev
;
1601 /* If it is still linked into the bucket list, free from the list */
1602 if (!list_empty(&obj
->hash_link
)) {
1603 list_del_init(&obj
->hash_link
);
1604 bucket
= yaffs_hash_fn(obj
->obj_id
);
1605 dev
->obj_bucket
[bucket
].count
--;
1609 /* FreeObject frees up a Object and puts it back on the free list */
1610 static void yaffs_free_obj(struct yaffs_obj
*obj
)
1612 struct yaffs_dev
*dev
;
1619 yaffs_trace(YAFFS_TRACE_OS
, "FreeObject %p inode %p",
1620 obj
, obj
->my_inode
);
1623 if (!list_empty(&obj
->siblings
))
1626 if (obj
->my_inode
) {
1627 /* We're still hooked up to a cached inode.
1628 * Don't delete now, but mark for later deletion
1630 obj
->defered_free
= 1;
1634 yaffs_unhash_obj(obj
);
1636 yaffs_free_raw_obj(dev
, obj
);
1638 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
1641 void yaffs_handle_defered_free(struct yaffs_obj
*obj
)
1643 if (obj
->defered_free
)
1644 yaffs_free_obj(obj
);
1647 static int yaffs_generic_obj_del(struct yaffs_obj
*in
)
1649 /* Iinvalidate the file's data in the cache, without flushing. */
1650 yaffs_invalidate_whole_cache(in
);
1652 if (in
->my_dev
->param
.is_yaffs2
&& in
->parent
!= in
->my_dev
->del_dir
) {
1653 /* Move to unlinked directory so we have a deletion record */
1654 yaffs_change_obj_name(in
, in
->my_dev
->del_dir
, _Y("deleted"), 0,
1658 yaffs_remove_obj_from_dir(in
);
1659 yaffs_chunk_del(in
->my_dev
, in
->hdr_chunk
, 1, __LINE__
);
1667 static void yaffs_soft_del_file(struct yaffs_obj
*obj
)
1669 if (!obj
->deleted
||
1670 obj
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
||
1674 if (obj
->n_data_chunks
<= 0) {
1675 /* Empty file with no duplicate object headers,
1676 * just delete it immediately */
1677 yaffs_free_tnode(obj
->my_dev
, obj
->variant
.file_variant
.top
);
1678 obj
->variant
.file_variant
.top
= NULL
;
1679 yaffs_trace(YAFFS_TRACE_TRACING
,
1680 "yaffs: Deleting empty file %d",
1682 yaffs_generic_obj_del(obj
);
1684 yaffs_soft_del_worker(obj
,
1685 obj
->variant
.file_variant
.top
,
1687 file_variant
.top_level
, 0);
1692 /* Pruning removes any part of the file structure tree that is beyond the
1693 * bounds of the file (ie that does not point to chunks).
1695 * A file should only get pruned when its size is reduced.
1697 * Before pruning, the chunks must be pulled from the tree and the
1698 * level 0 tnode entries must be zeroed out.
1699 * Could also use this for file deletion, but that's probably better handled
1700 * by a special case.
1702 * This function is recursive. For levels > 0 the function is called again on
1703 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1704 * If there is no data in a subtree then it is pruned.
1707 static struct yaffs_tnode
*yaffs_prune_worker(struct yaffs_dev
*dev
,
1708 struct yaffs_tnode
*tn
, u32 level
,
1720 for (i
= 0; i
< YAFFS_NTNODES_INTERNAL
; i
++) {
1721 if (tn
->internal
[i
]) {
1723 yaffs_prune_worker(dev
,
1726 (i
== 0) ? del0
: 1);
1729 if (tn
->internal
[i
])
1733 int tnode_size_u32
= dev
->tnode_size
/ sizeof(u32
);
1734 u32
*map
= (u32
*) tn
;
1736 for (i
= 0; !has_data
&& i
< tnode_size_u32
; i
++) {
1742 if (has_data
== 0 && del0
) {
1743 /* Free and return NULL */
1744 yaffs_free_tnode(dev
, tn
);
1750 static int yaffs_prune_tree(struct yaffs_dev
*dev
,
1751 struct yaffs_file_var
*file_struct
)
1756 struct yaffs_tnode
*tn
;
1758 if (file_struct
->top_level
< 1)
1762 yaffs_prune_worker(dev
, file_struct
->top
, file_struct
->top_level
, 0);
1764 /* Now we have a tree with all the non-zero branches NULL but
1765 * the height is the same as it was.
1766 * Let's see if we can trim internal tnodes to shorten the tree.
1767 * We can do this if only the 0th element in the tnode is in use
1768 * (ie all the non-zero are NULL)
1771 while (file_struct
->top_level
&& !done
) {
1772 tn
= file_struct
->top
;
1775 for (i
= 1; i
< YAFFS_NTNODES_INTERNAL
; i
++) {
1776 if (tn
->internal
[i
])
1781 file_struct
->top
= tn
->internal
[0];
1782 file_struct
->top_level
--;
1783 yaffs_free_tnode(dev
, tn
);
1792 /*-------------------- End of File Structure functions.-------------------*/
1794 /* alloc_empty_obj gets us a clean Object.*/
1795 static struct yaffs_obj
*yaffs_alloc_empty_obj(struct yaffs_dev
*dev
)
1797 struct yaffs_obj
*obj
= yaffs_alloc_raw_obj(dev
);
1804 /* Now sweeten it up... */
1806 memset(obj
, 0, sizeof(struct yaffs_obj
));
1807 obj
->being_created
= 1;
1811 obj
->variant_type
= YAFFS_OBJECT_TYPE_UNKNOWN
;
1812 INIT_LIST_HEAD(&(obj
->hard_links
));
1813 INIT_LIST_HEAD(&(obj
->hash_link
));
1814 INIT_LIST_HEAD(&obj
->siblings
);
1816 /* Now make the directory sane */
1817 if (dev
->root_dir
) {
1818 obj
->parent
= dev
->root_dir
;
1819 list_add(&(obj
->siblings
),
1820 &dev
->root_dir
->variant
.dir_variant
.children
);
1823 /* Add it to the lost and found directory.
1824 * NB Can't put root or lost-n-found in lost-n-found so
1825 * check if lost-n-found exists first
1827 if (dev
->lost_n_found
)
1828 yaffs_add_obj_to_dir(dev
->lost_n_found
, obj
);
1830 obj
->being_created
= 0;
1832 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
1837 static int yaffs_find_nice_bucket(struct yaffs_dev
*dev
)
1841 int lowest
= 999999;
1843 /* Search for the shortest list or one that
1847 for (i
= 0; i
< 10 && lowest
> 4; i
++) {
1848 dev
->bucket_finder
++;
1849 dev
->bucket_finder
%= YAFFS_NOBJECT_BUCKETS
;
1850 if (dev
->obj_bucket
[dev
->bucket_finder
].count
< lowest
) {
1851 lowest
= dev
->obj_bucket
[dev
->bucket_finder
].count
;
1852 l
= dev
->bucket_finder
;
1859 static int yaffs_new_obj_id(struct yaffs_dev
*dev
)
1861 int bucket
= yaffs_find_nice_bucket(dev
);
1863 struct list_head
*i
;
1864 u32 n
= (u32
) bucket
;
1866 /* Now find an object value that has not already been taken
1867 * by scanning the list.
1872 n
+= YAFFS_NOBJECT_BUCKETS
;
1873 if (1 || dev
->obj_bucket
[bucket
].count
> 0) {
1874 list_for_each(i
, &dev
->obj_bucket
[bucket
].list
) {
1875 /* If there is already one in the list */
1876 if (i
&& list_entry(i
, struct yaffs_obj
,
1877 hash_link
)->obj_id
== n
) {
1886 static void yaffs_hash_obj(struct yaffs_obj
*in
)
1888 int bucket
= yaffs_hash_fn(in
->obj_id
);
1889 struct yaffs_dev
*dev
= in
->my_dev
;
1891 list_add(&in
->hash_link
, &dev
->obj_bucket
[bucket
].list
);
1892 dev
->obj_bucket
[bucket
].count
++;
1895 struct yaffs_obj
*yaffs_find_by_number(struct yaffs_dev
*dev
, u32 number
)
1897 int bucket
= yaffs_hash_fn(number
);
1898 struct list_head
*i
;
1899 struct yaffs_obj
*in
;
1901 list_for_each(i
, &dev
->obj_bucket
[bucket
].list
) {
1902 /* Look if it is in the list */
1903 in
= list_entry(i
, struct yaffs_obj
, hash_link
);
1904 if (in
->obj_id
== number
) {
1905 /* Don't show if it is defered free */
1906 if (in
->defered_free
)
1915 struct yaffs_obj
*yaffs_new_obj(struct yaffs_dev
*dev
, int number
,
1916 enum yaffs_obj_type type
)
1918 struct yaffs_obj
*the_obj
= NULL
;
1919 struct yaffs_tnode
*tn
= NULL
;
1922 number
= yaffs_new_obj_id(dev
);
1924 if (type
== YAFFS_OBJECT_TYPE_FILE
) {
1925 tn
= yaffs_get_tnode(dev
);
1930 the_obj
= yaffs_alloc_empty_obj(dev
);
1933 yaffs_free_tnode(dev
, tn
);
1938 the_obj
->rename_allowed
= 1;
1939 the_obj
->unlink_allowed
= 1;
1940 the_obj
->obj_id
= number
;
1941 yaffs_hash_obj(the_obj
);
1942 the_obj
->variant_type
= type
;
1943 yaffs_load_current_time(the_obj
, 1, 1);
1946 case YAFFS_OBJECT_TYPE_FILE
:
1947 the_obj
->variant
.file_variant
.file_size
= 0;
1948 the_obj
->variant
.file_variant
.scanned_size
= 0;
1949 the_obj
->variant
.file_variant
.shrink_size
=
1950 yaffs_max_file_size(dev
);
1951 the_obj
->variant
.file_variant
.top_level
= 0;
1952 the_obj
->variant
.file_variant
.top
= tn
;
1954 case YAFFS_OBJECT_TYPE_DIRECTORY
:
1955 INIT_LIST_HEAD(&the_obj
->variant
.dir_variant
.children
);
1956 INIT_LIST_HEAD(&the_obj
->variant
.dir_variant
.dirty
);
1958 case YAFFS_OBJECT_TYPE_SYMLINK
:
1959 case YAFFS_OBJECT_TYPE_HARDLINK
:
1960 case YAFFS_OBJECT_TYPE_SPECIAL
:
1961 /* No action required */
1963 case YAFFS_OBJECT_TYPE_UNKNOWN
:
1964 /* todo this should not happen */
1970 static struct yaffs_obj
*yaffs_create_fake_dir(struct yaffs_dev
*dev
,
1971 int number
, u32 mode
)
1974 struct yaffs_obj
*obj
=
1975 yaffs_new_obj(dev
, number
, YAFFS_OBJECT_TYPE_DIRECTORY
);
1980 obj
->fake
= 1; /* it is fake so it might not use NAND */
1981 obj
->rename_allowed
= 0;
1982 obj
->unlink_allowed
= 0;
1985 obj
->yst_mode
= mode
;
1987 obj
->hdr_chunk
= 0; /* Not a valid chunk. */
1993 static void yaffs_init_tnodes_and_objs(struct yaffs_dev
*dev
)
1999 yaffs_init_raw_tnodes_and_objs(dev
);
2001 for (i
= 0; i
< YAFFS_NOBJECT_BUCKETS
; i
++) {
2002 INIT_LIST_HEAD(&dev
->obj_bucket
[i
].list
);
2003 dev
->obj_bucket
[i
].count
= 0;
2007 struct yaffs_obj
*yaffs_find_or_create_by_number(struct yaffs_dev
*dev
,
2009 enum yaffs_obj_type type
)
2011 struct yaffs_obj
*the_obj
= NULL
;
2014 the_obj
= yaffs_find_by_number(dev
, number
);
2017 the_obj
= yaffs_new_obj(dev
, number
, type
);
2023 YCHAR
*yaffs_clone_str(const YCHAR
*str
)
2025 YCHAR
*new_str
= NULL
;
2031 len
= yaffs_strnlen(str
, YAFFS_MAX_ALIAS_LENGTH
);
2032 new_str
= kmalloc((len
+ 1) * sizeof(YCHAR
), GFP_NOFS
);
2034 yaffs_strncpy(new_str
, str
, len
);
2041 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2042 * link (ie. name) is created or deleted in the directory.
2045 * create dir/a : update dir's mtime/ctime
2046 * rm dir/a: update dir's mtime/ctime
2047 * modify dir/a: don't update dir's mtimme/ctime
2049 * This can be handled immediately or defered. Defering helps reduce the number
2050 * of updates when many files in a directory are changed within a brief period.
2052 * If the directory updating is defered then yaffs_update_dirty_dirs must be
2053 * called periodically.
2056 static void yaffs_update_parent(struct yaffs_obj
*obj
)
2058 struct yaffs_dev
*dev
;
2064 yaffs_load_current_time(obj
, 0, 1);
2065 if (dev
->param
.defered_dir_update
) {
2066 struct list_head
*link
= &obj
->variant
.dir_variant
.dirty
;
2068 if (list_empty(link
)) {
2069 list_add(link
, &dev
->dirty_dirs
);
2070 yaffs_trace(YAFFS_TRACE_BACKGROUND
,
2071 "Added object %d to dirty directories",
2076 yaffs_update_oh(obj
, NULL
, 0, 0, 0, NULL
);
2080 void yaffs_update_dirty_dirs(struct yaffs_dev
*dev
)
2082 struct list_head
*link
;
2083 struct yaffs_obj
*obj
;
2084 struct yaffs_dir_var
*d_s
;
2085 union yaffs_obj_var
*o_v
;
2087 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Update dirty directories");
2089 while (!list_empty(&dev
->dirty_dirs
)) {
2090 link
= dev
->dirty_dirs
.next
;
2091 list_del_init(link
);
2093 d_s
= list_entry(link
, struct yaffs_dir_var
, dirty
);
2094 o_v
= list_entry(d_s
, union yaffs_obj_var
, dir_variant
);
2095 obj
= list_entry(o_v
, struct yaffs_obj
, variant
);
2097 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Update directory %d",
2101 yaffs_update_oh(obj
, NULL
, 0, 0, 0, NULL
);
2106 * Mknod (create) a new object.
2107 * equiv_obj only has meaning for a hard link;
2108 * alias_str only has meaning for a symlink.
2109 * rdev only has meaning for devices (a subset of special objects)
2112 static struct yaffs_obj
*yaffs_create_obj(enum yaffs_obj_type type
,
2113 struct yaffs_obj
*parent
,
2118 struct yaffs_obj
*equiv_obj
,
2119 const YCHAR
*alias_str
, u32 rdev
)
2121 struct yaffs_obj
*in
;
2123 struct yaffs_dev
*dev
= parent
->my_dev
;
2125 /* Check if the entry exists.
2126 * If it does then fail the call since we don't want a dup. */
2127 if (yaffs_find_by_name(parent
, name
))
2130 if (type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
2131 str
= yaffs_clone_str(alias_str
);
2136 in
= yaffs_new_obj(dev
, -1, type
);
2145 in
->variant_type
= type
;
2147 in
->yst_mode
= mode
;
2149 yaffs_attribs_init(in
, gid
, uid
, rdev
);
2151 in
->n_data_chunks
= 0;
2153 yaffs_set_obj_name(in
, name
);
2156 yaffs_add_obj_to_dir(parent
, in
);
2158 in
->my_dev
= parent
->my_dev
;
2161 case YAFFS_OBJECT_TYPE_SYMLINK
:
2162 in
->variant
.symlink_variant
.alias
= str
;
2164 case YAFFS_OBJECT_TYPE_HARDLINK
:
2165 in
->variant
.hardlink_variant
.equiv_obj
= equiv_obj
;
2166 in
->variant
.hardlink_variant
.equiv_id
= equiv_obj
->obj_id
;
2167 list_add(&in
->hard_links
, &equiv_obj
->hard_links
);
2169 case YAFFS_OBJECT_TYPE_FILE
:
2170 case YAFFS_OBJECT_TYPE_DIRECTORY
:
2171 case YAFFS_OBJECT_TYPE_SPECIAL
:
2172 case YAFFS_OBJECT_TYPE_UNKNOWN
:
2177 if (yaffs_update_oh(in
, name
, 0, 0, 0, NULL
) < 0) {
2178 /* Could not create the object header, fail */
2184 yaffs_update_parent(parent
);
2189 struct yaffs_obj
*yaffs_create_file(struct yaffs_obj
*parent
,
2190 const YCHAR
*name
, u32 mode
, u32 uid
,
2193 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE
, parent
, name
, mode
,
2194 uid
, gid
, NULL
, NULL
, 0);
2197 struct yaffs_obj
*yaffs_create_dir(struct yaffs_obj
*parent
, const YCHAR
*name
,
2198 u32 mode
, u32 uid
, u32 gid
)
2200 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY
, parent
, name
,
2201 mode
, uid
, gid
, NULL
, NULL
, 0);
2204 struct yaffs_obj
*yaffs_create_special(struct yaffs_obj
*parent
,
2205 const YCHAR
*name
, u32 mode
, u32 uid
,
2208 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL
, parent
, name
, mode
,
2209 uid
, gid
, NULL
, NULL
, rdev
);
2212 struct yaffs_obj
*yaffs_create_symlink(struct yaffs_obj
*parent
,
2213 const YCHAR
*name
, u32 mode
, u32 uid
,
2214 u32 gid
, const YCHAR
*alias
)
2216 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK
, parent
, name
, mode
,
2217 uid
, gid
, NULL
, alias
, 0);
2220 /* yaffs_link_obj returns the object id of the equivalent object.*/
2221 struct yaffs_obj
*yaffs_link_obj(struct yaffs_obj
*parent
, const YCHAR
* name
,
2222 struct yaffs_obj
*equiv_obj
)
2224 /* Get the real object in case we were fed a hard link obj */
2225 equiv_obj
= yaffs_get_equivalent_obj(equiv_obj
);
2227 if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK
,
2228 parent
, name
, 0, 0, 0,
2229 equiv_obj
, NULL
, 0))
2238 /*---------------------- Block Management and Page Allocation -------------*/
2240 static void yaffs_deinit_blocks(struct yaffs_dev
*dev
)
2242 if (dev
->block_info_alt
&& dev
->block_info
)
2243 vfree(dev
->block_info
);
2245 kfree(dev
->block_info
);
2247 dev
->block_info_alt
= 0;
2249 dev
->block_info
= NULL
;
2251 if (dev
->chunk_bits_alt
&& dev
->chunk_bits
)
2252 vfree(dev
->chunk_bits
);
2254 kfree(dev
->chunk_bits
);
2255 dev
->chunk_bits_alt
= 0;
2256 dev
->chunk_bits
= NULL
;
2259 static int yaffs_init_blocks(struct yaffs_dev
*dev
)
2261 int n_blocks
= dev
->internal_end_block
- dev
->internal_start_block
+ 1;
2263 dev
->block_info
= NULL
;
2264 dev
->chunk_bits
= NULL
;
2265 dev
->alloc_block
= -1; /* force it to get a new one */
2267 /* If the first allocation strategy fails, thry the alternate one */
2269 kmalloc(n_blocks
* sizeof(struct yaffs_block_info
), GFP_NOFS
);
2270 if (!dev
->block_info
) {
2272 vmalloc(n_blocks
* sizeof(struct yaffs_block_info
));
2273 dev
->block_info_alt
= 1;
2275 dev
->block_info_alt
= 0;
2278 if (!dev
->block_info
)
2281 /* Set up dynamic blockinfo stuff. Round up bytes. */
2282 dev
->chunk_bit_stride
= (dev
->param
.chunks_per_block
+ 7) / 8;
2284 kmalloc(dev
->chunk_bit_stride
* n_blocks
, GFP_NOFS
);
2285 if (!dev
->chunk_bits
) {
2287 vmalloc(dev
->chunk_bit_stride
* n_blocks
);
2288 dev
->chunk_bits_alt
= 1;
2290 dev
->chunk_bits_alt
= 0;
2292 if (!dev
->chunk_bits
)
2296 memset(dev
->block_info
, 0, n_blocks
* sizeof(struct yaffs_block_info
));
2297 memset(dev
->chunk_bits
, 0, dev
->chunk_bit_stride
* n_blocks
);
2301 yaffs_deinit_blocks(dev
);
2306 void yaffs_block_became_dirty(struct yaffs_dev
*dev
, int block_no
)
2308 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, block_no
);
2312 /* If the block is still healthy erase it and mark as clean.
2313 * If the block has had a data failure, then retire it.
2316 yaffs_trace(YAFFS_TRACE_GC
| YAFFS_TRACE_ERASE
,
2317 "yaffs_block_became_dirty block %d state %d %s",
2318 block_no
, bi
->block_state
,
2319 (bi
->needs_retiring
) ? "needs retiring" : "");
2321 yaffs2_clear_oldest_dirty_seq(dev
, bi
);
2323 bi
->block_state
= YAFFS_BLOCK_STATE_DIRTY
;
2325 /* If this is the block being garbage collected then stop gc'ing */
2326 if (block_no
== dev
->gc_block
)
2329 /* If this block is currently the best candidate for gc
2330 * then drop as a candidate */
2331 if (block_no
== dev
->gc_dirtiest
) {
2332 dev
->gc_dirtiest
= 0;
2333 dev
->gc_pages_in_use
= 0;
2336 if (!bi
->needs_retiring
) {
2337 yaffs2_checkpt_invalidate(dev
);
2338 erased_ok
= yaffs_erase_block(dev
, block_no
);
2340 dev
->n_erase_failures
++;
2341 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
2342 "**>> Erasure failed %d", block_no
);
2346 /* Verify erasure if needed */
2348 ((yaffs_trace_mask
& YAFFS_TRACE_ERASE
) ||
2349 !yaffs_skip_verification(dev
))) {
2350 for (i
= 0; i
< dev
->param
.chunks_per_block
; i
++) {
2351 if (!yaffs_check_chunk_erased(dev
,
2352 block_no
* dev
->param
.chunks_per_block
+ i
)) {
2353 yaffs_trace(YAFFS_TRACE_ERROR
,
2354 ">>Block %d erasure supposedly OK, but chunk %d not erased",
2361 /* We lost a block of free space */
2362 dev
->n_free_chunks
-= dev
->param
.chunks_per_block
;
2363 yaffs_retire_block(dev
, block_no
);
2364 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
2365 "**>> Block %d retired", block_no
);
2369 /* Clean it up... */
2370 bi
->block_state
= YAFFS_BLOCK_STATE_EMPTY
;
2372 dev
->n_erased_blocks
++;
2373 bi
->pages_in_use
= 0;
2374 bi
->soft_del_pages
= 0;
2375 bi
->has_shrink_hdr
= 0;
2376 bi
->skip_erased_check
= 1; /* Clean, so no need to check */
2377 bi
->gc_prioritise
= 0;
2378 bi
->has_summary
= 0;
2380 yaffs_clear_chunk_bits(dev
, block_no
);
2382 yaffs_trace(YAFFS_TRACE_ERASE
, "Erased block %d", block_no
);
2385 static inline int yaffs_gc_process_chunk(struct yaffs_dev
*dev
,
2386 struct yaffs_block_info
*bi
,
2387 int old_chunk
, u8
*buffer
)
2391 struct yaffs_ext_tags tags
;
2392 struct yaffs_obj
*object
;
2394 int ret_val
= YAFFS_OK
;
2396 memset(&tags
, 0, sizeof(tags
));
2397 yaffs_rd_chunk_tags_nand(dev
, old_chunk
,
2399 object
= yaffs_find_by_number(dev
, tags
.obj_id
);
2401 yaffs_trace(YAFFS_TRACE_GC_DETAIL
,
2402 "Collecting chunk in block %d, %d %d %d ",
2403 dev
->gc_chunk
, tags
.obj_id
,
2404 tags
.chunk_id
, tags
.n_bytes
);
2406 if (object
&& !yaffs_skip_verification(dev
)) {
2407 if (tags
.chunk_id
== 0)
2410 else if (object
->soft_del
)
2411 /* Defeat the test */
2412 matching_chunk
= old_chunk
;
2415 yaffs_find_chunk_in_file
2416 (object
, tags
.chunk_id
,
2419 if (old_chunk
!= matching_chunk
)
2420 yaffs_trace(YAFFS_TRACE_ERROR
,
2421 "gc: page in gc mismatch: %d %d %d %d",
2429 yaffs_trace(YAFFS_TRACE_ERROR
,
2430 "page %d in gc has no object: %d %d %d ",
2432 tags
.obj_id
, tags
.chunk_id
,
2438 object
->soft_del
&& tags
.chunk_id
!= 0) {
2439 /* Data chunk in a soft deleted file,
2441 * It's a soft deleted data chunk,
2442 * No need to copy this, just forget
2443 * about it and fix up the object.
2446 /* Free chunks already includes
2447 * softdeleted chunks, how ever this
2448 * chunk is going to soon be really
2449 * deleted which will increment free
2450 * chunks. We have to decrement free
2451 * chunks so this works out properly.
2453 dev
->n_free_chunks
--;
2454 bi
->soft_del_pages
--;
2456 object
->n_data_chunks
--;
2457 if (object
->n_data_chunks
<= 0) {
2458 /* remeber to clean up obj */
2459 dev
->gc_cleanup_list
[dev
->n_clean_ups
] = tags
.obj_id
;
2463 } else if (object
) {
2464 /* It's either a data chunk in a live
2465 * file or an ObjectHeader, so we're
2467 * NB Need to keep the ObjectHeaders of
2468 * deleted files until the whole file
2469 * has been deleted off
2471 tags
.serial_number
++;
2474 if (tags
.chunk_id
== 0) {
2475 /* It is an object Id,
2476 * We need to nuke the
2477 * shrinkheader flags since its
2479 * Also need to clean up
2482 struct yaffs_obj_hdr
*oh
;
2483 oh
= (struct yaffs_obj_hdr
*) buffer
;
2486 tags
.extra_is_shrink
= 0;
2487 oh
->shadows_obj
= 0;
2488 oh
->inband_shadowed_obj_id
= 0;
2489 tags
.extra_shadows
= 0;
2491 /* Update file size */
2492 if (object
->variant_type
== YAFFS_OBJECT_TYPE_FILE
) {
2493 yaffs_oh_size_load(oh
,
2494 object
->variant
.file_variant
.file_size
);
2495 tags
.extra_file_size
=
2496 object
->variant
.file_variant
.file_size
;
2499 yaffs_verify_oh(object
, oh
, &tags
, 1);
2501 yaffs_write_new_chunk(dev
, (u8
*) oh
, &tags
, 1);
2504 yaffs_write_new_chunk(dev
, buffer
, &tags
, 1);
2507 if (new_chunk
< 0) {
2508 ret_val
= YAFFS_FAIL
;
2511 /* Now fix up the Tnodes etc. */
2513 if (tags
.chunk_id
== 0) {
2515 object
->hdr_chunk
= new_chunk
;
2516 object
->serial
= tags
.serial_number
;
2518 /* It's a data chunk */
2519 yaffs_put_chunk_in_file(object
, tags
.chunk_id
,
2524 if (ret_val
== YAFFS_OK
)
2525 yaffs_chunk_del(dev
, old_chunk
, mark_flash
, __LINE__
);
2529 static int yaffs_gc_block(struct yaffs_dev
*dev
, int block
, int whole_block
)
2532 int ret_val
= YAFFS_OK
;
2534 int is_checkpt_block
;
2536 int chunks_before
= yaffs_get_erased_chunks(dev
);
2538 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, block
);
2540 is_checkpt_block
= (bi
->block_state
== YAFFS_BLOCK_STATE_CHECKPOINT
);
2542 yaffs_trace(YAFFS_TRACE_TRACING
,
2543 "Collecting block %d, in use %d, shrink %d, whole_block %d",
2544 block
, bi
->pages_in_use
, bi
->has_shrink_hdr
,
2547 /*yaffs_verify_free_chunks(dev); */
2549 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
)
2550 bi
->block_state
= YAFFS_BLOCK_STATE_COLLECTING
;
2552 bi
->has_shrink_hdr
= 0; /* clear the flag so that the block can erase */
2554 dev
->gc_disable
= 1;
2556 yaffs_summary_gc(dev
, block
);
2558 if (is_checkpt_block
|| !yaffs_still_some_chunks(dev
, block
)) {
2559 yaffs_trace(YAFFS_TRACE_TRACING
,
2560 "Collecting block %d that has no chunks in use",
2562 yaffs_block_became_dirty(dev
, block
);
2565 u8
*buffer
= yaffs_get_temp_buffer(dev
);
2567 yaffs_verify_blk(dev
, bi
, block
);
2569 max_copies
= (whole_block
) ? dev
->param
.chunks_per_block
: 5;
2570 old_chunk
= block
* dev
->param
.chunks_per_block
+ dev
->gc_chunk
;
2572 for (/* init already done */ ;
2573 ret_val
== YAFFS_OK
&&
2574 dev
->gc_chunk
< dev
->param
.chunks_per_block
&&
2575 (bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) &&
2577 dev
->gc_chunk
++, old_chunk
++) {
2578 if (yaffs_check_chunk_bit(dev
, block
, dev
->gc_chunk
)) {
2579 /* Page is in use and might need to be copied */
2581 ret_val
= yaffs_gc_process_chunk(dev
, bi
,
2585 yaffs_release_temp_buffer(dev
, buffer
);
2588 yaffs_verify_collected_blk(dev
, bi
, block
);
2590 if (bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) {
2592 * The gc did not complete. Set block state back to FULL
2593 * because checkpointing does not restore gc.
2595 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
2597 /* The gc completed. */
2598 /* Do any required cleanups */
2599 for (i
= 0; i
< dev
->n_clean_ups
; i
++) {
2600 /* Time to delete the file too */
2601 struct yaffs_obj
*object
=
2602 yaffs_find_by_number(dev
, dev
->gc_cleanup_list
[i
]);
2604 yaffs_free_tnode(dev
,
2605 object
->variant
.file_variant
.top
);
2606 object
->variant
.file_variant
.top
= NULL
;
2607 yaffs_trace(YAFFS_TRACE_GC
,
2608 "yaffs: About to finally delete object %d",
2610 yaffs_generic_obj_del(object
);
2611 object
->my_dev
->n_deleted_files
--;
2615 chunks_after
= yaffs_get_erased_chunks(dev
);
2616 if (chunks_before
>= chunks_after
)
2617 yaffs_trace(YAFFS_TRACE_GC
,
2618 "gc did not increase free chunks before %d after %d",
2619 chunks_before
, chunks_after
);
2622 dev
->n_clean_ups
= 0;
2625 dev
->gc_disable
= 0;
2631 * find_gc_block() selects the dirtiest block (or close enough)
2632 * for garbage collection.
2635 static unsigned yaffs_find_gc_block(struct yaffs_dev
*dev
,
2636 int aggressive
, int background
)
2640 unsigned selected
= 0;
2641 int prioritised
= 0;
2642 int prioritised_exist
= 0;
2643 struct yaffs_block_info
*bi
;
2646 /* First let's see if we need to grab a prioritised block */
2647 if (dev
->has_pending_prioritised_gc
&& !aggressive
) {
2648 dev
->gc_dirtiest
= 0;
2649 bi
= dev
->block_info
;
2650 for (i
= dev
->internal_start_block
;
2651 i
<= dev
->internal_end_block
&& !selected
; i
++) {
2653 if (bi
->gc_prioritise
) {
2654 prioritised_exist
= 1;
2655 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
&&
2656 yaffs_block_ok_for_gc(dev
, bi
)) {
2665 * If there is a prioritised block and none was selected then
2666 * this happened because there is at least one old dirty block
2667 * gumming up the works. Let's gc the oldest dirty block.
2670 if (prioritised_exist
&&
2671 !selected
&& dev
->oldest_dirty_block
> 0)
2672 selected
= dev
->oldest_dirty_block
;
2674 if (!prioritised_exist
) /* None found, so we can clear this */
2675 dev
->has_pending_prioritised_gc
= 0;
2678 /* If we're doing aggressive GC then we are happy to take a less-dirty
2679 * block, and search harder.
2680 * else (leasurely gc), then we only bother to do this if the
2681 * block has only a few pages in use.
2687 dev
->internal_end_block
- dev
->internal_start_block
+ 1;
2689 threshold
= dev
->param
.chunks_per_block
;
2690 iterations
= n_blocks
;
2695 max_threshold
= dev
->param
.chunks_per_block
/ 2;
2697 max_threshold
= dev
->param
.chunks_per_block
/ 8;
2699 if (max_threshold
< YAFFS_GC_PASSIVE_THRESHOLD
)
2700 max_threshold
= YAFFS_GC_PASSIVE_THRESHOLD
;
2702 threshold
= background
? (dev
->gc_not_done
+ 2) * 2 : 0;
2703 if (threshold
< YAFFS_GC_PASSIVE_THRESHOLD
)
2704 threshold
= YAFFS_GC_PASSIVE_THRESHOLD
;
2705 if (threshold
> max_threshold
)
2706 threshold
= max_threshold
;
2708 iterations
= n_blocks
/ 16 + 1;
2709 if (iterations
> 100)
2715 (dev
->gc_dirtiest
< 1 ||
2716 dev
->gc_pages_in_use
> YAFFS_GC_GOOD_ENOUGH
);
2718 dev
->gc_block_finder
++;
2719 if (dev
->gc_block_finder
< dev
->internal_start_block
||
2720 dev
->gc_block_finder
> dev
->internal_end_block
)
2721 dev
->gc_block_finder
=
2722 dev
->internal_start_block
;
2724 bi
= yaffs_get_block_info(dev
, dev
->gc_block_finder
);
2726 pages_used
= bi
->pages_in_use
- bi
->soft_del_pages
;
2728 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
&&
2729 pages_used
< dev
->param
.chunks_per_block
&&
2730 (dev
->gc_dirtiest
< 1 ||
2731 pages_used
< dev
->gc_pages_in_use
) &&
2732 yaffs_block_ok_for_gc(dev
, bi
)) {
2733 dev
->gc_dirtiest
= dev
->gc_block_finder
;
2734 dev
->gc_pages_in_use
= pages_used
;
2738 if (dev
->gc_dirtiest
> 0 && dev
->gc_pages_in_use
<= threshold
)
2739 selected
= dev
->gc_dirtiest
;
2743 * If nothing has been selected for a while, try the oldest dirty
2744 * because that's gumming up the works.
2747 if (!selected
&& dev
->param
.is_yaffs2
&&
2748 dev
->gc_not_done
>= (background
? 10 : 20)) {
2749 yaffs2_find_oldest_dirty_seq(dev
);
2750 if (dev
->oldest_dirty_block
> 0) {
2751 selected
= dev
->oldest_dirty_block
;
2752 dev
->gc_dirtiest
= selected
;
2753 dev
->oldest_dirty_gc_count
++;
2754 bi
= yaffs_get_block_info(dev
, selected
);
2755 dev
->gc_pages_in_use
=
2756 bi
->pages_in_use
- bi
->soft_del_pages
;
2758 dev
->gc_not_done
= 0;
2763 yaffs_trace(YAFFS_TRACE_GC
,
2764 "GC Selected block %d with %d free, prioritised:%d",
2766 dev
->param
.chunks_per_block
- dev
->gc_pages_in_use
,
2773 dev
->gc_dirtiest
= 0;
2774 dev
->gc_pages_in_use
= 0;
2775 dev
->gc_not_done
= 0;
2776 if (dev
->refresh_skip
> 0)
2777 dev
->refresh_skip
--;
2780 yaffs_trace(YAFFS_TRACE_GC
,
2781 "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2782 dev
->gc_block_finder
, dev
->gc_not_done
, threshold
,
2783 dev
->gc_dirtiest
, dev
->gc_pages_in_use
,
2784 dev
->oldest_dirty_block
, background
? " bg" : "");
2790 /* New garbage collector
2791 * If we're very low on erased blocks then we do aggressive garbage collection
2792 * otherwise we do "leasurely" garbage collection.
2793 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2794 * Passive gc only inspects smaller areas and only accepts more dirty blocks.
2796 * The idea is to help clear out space in a more spread-out manner.
2797 * Dunno if it really does anything useful.
2799 static int yaffs_check_gc(struct yaffs_dev
*dev
, int background
)
2802 int gc_ok
= YAFFS_OK
;
2806 int checkpt_block_adjust
;
2808 if (dev
->param
.gc_control
&& (dev
->param
.gc_control(dev
) & 1) == 0)
2811 if (dev
->gc_disable
)
2812 /* Bail out so we don't get recursive gc */
2815 /* This loop should pass the first time.
2816 * Only loops here if the collection does not increase space.
2822 checkpt_block_adjust
= yaffs_calc_checkpt_blocks_required(dev
);
2825 dev
->param
.n_reserved_blocks
+ checkpt_block_adjust
+ 1;
2827 dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2829 /* If we need a block soon then do aggressive gc. */
2830 if (dev
->n_erased_blocks
< min_erased
)
2834 && erased_chunks
> (dev
->n_free_chunks
/ 4))
2837 if (dev
->gc_skip
> 20)
2839 if (erased_chunks
< dev
->n_free_chunks
/ 2 ||
2840 dev
->gc_skip
< 1 || background
)
2850 /* If we don't already have a block being gc'd then see if we
2851 * should start another */
2853 if (dev
->gc_block
< 1 && !aggressive
) {
2854 dev
->gc_block
= yaffs2_find_refresh_block(dev
);
2856 dev
->n_clean_ups
= 0;
2858 if (dev
->gc_block
< 1) {
2860 yaffs_find_gc_block(dev
, aggressive
, background
);
2862 dev
->n_clean_ups
= 0;
2865 if (dev
->gc_block
> 0) {
2868 dev
->passive_gc_count
++;
2870 yaffs_trace(YAFFS_TRACE_GC
,
2871 "yaffs: GC n_erased_blocks %d aggressive %d",
2872 dev
->n_erased_blocks
, aggressive
);
2874 gc_ok
= yaffs_gc_block(dev
, dev
->gc_block
, aggressive
);
2877 if (dev
->n_erased_blocks
< (dev
->param
.n_reserved_blocks
) &&
2878 dev
->gc_block
> 0) {
2879 yaffs_trace(YAFFS_TRACE_GC
,
2880 "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2881 dev
->n_erased_blocks
, max_tries
,
2884 } while ((dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
) &&
2885 (dev
->gc_block
> 0) && (max_tries
< 2));
2887 return aggressive
? gc_ok
: YAFFS_OK
;
2892 * Garbage collects. Intended to be called from a background thread.
2893 * Returns non-zero if at least half the free chunks are erased.
2895 int yaffs_bg_gc(struct yaffs_dev
*dev
, unsigned urgency
)
2897 int erased_chunks
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2899 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Background gc %u", urgency
);
2901 yaffs_check_gc(dev
, 1);
2902 return erased_chunks
> dev
->n_free_chunks
/ 2;
2905 /*-------------------- Data file manipulation -----------------*/
2907 static int yaffs_rd_data_obj(struct yaffs_obj
*in
, int inode_chunk
, u8
* buffer
)
2909 int nand_chunk
= yaffs_find_chunk_in_file(in
, inode_chunk
, NULL
);
2911 if (nand_chunk
>= 0)
2912 return yaffs_rd_chunk_tags_nand(in
->my_dev
, nand_chunk
,
2915 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
2916 "Chunk %d not found zero instead",
2918 /* get sane (zero) data if you read a hole */
2919 memset(buffer
, 0, in
->my_dev
->data_bytes_per_chunk
);
2925 void yaffs_chunk_del(struct yaffs_dev
*dev
, int chunk_id
, int mark_flash
,
2930 struct yaffs_ext_tags tags
;
2931 struct yaffs_block_info
*bi
;
2937 block
= chunk_id
/ dev
->param
.chunks_per_block
;
2938 page
= chunk_id
% dev
->param
.chunks_per_block
;
2940 if (!yaffs_check_chunk_bit(dev
, block
, page
))
2941 yaffs_trace(YAFFS_TRACE_VERIFY
,
2942 "Deleting invalid chunk %d", chunk_id
);
2944 bi
= yaffs_get_block_info(dev
, block
);
2946 yaffs2_update_oldest_dirty_seq(dev
, block
, bi
);
2948 yaffs_trace(YAFFS_TRACE_DELETION
,
2949 "line %d delete of chunk %d",
2952 if (!dev
->param
.is_yaffs2
&& mark_flash
&&
2953 bi
->block_state
!= YAFFS_BLOCK_STATE_COLLECTING
) {
2955 memset(&tags
, 0, sizeof(tags
));
2956 tags
.is_deleted
= 1;
2957 yaffs_wr_chunk_tags_nand(dev
, chunk_id
, NULL
, &tags
);
2958 yaffs_handle_chunk_update(dev
, chunk_id
, &tags
);
2960 dev
->n_unmarked_deletions
++;
2963 /* Pull out of the management area.
2964 * If the whole block became dirty, this will kick off an erasure.
2966 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
||
2967 bi
->block_state
== YAFFS_BLOCK_STATE_FULL
||
2968 bi
->block_state
== YAFFS_BLOCK_STATE_NEEDS_SCAN
||
2969 bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) {
2970 dev
->n_free_chunks
++;
2971 yaffs_clear_chunk_bit(dev
, block
, page
);
2974 if (bi
->pages_in_use
== 0 &&
2975 !bi
->has_shrink_hdr
&&
2976 bi
->block_state
!= YAFFS_BLOCK_STATE_ALLOCATING
&&
2977 bi
->block_state
!= YAFFS_BLOCK_STATE_NEEDS_SCAN
) {
2978 yaffs_block_became_dirty(dev
, block
);
2983 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
2984 const u8
*buffer
, int n_bytes
, int use_reserve
)
2986 /* Find old chunk Need to do this to get serial number
2987 * Write new one and patch into tree.
2988 * Invalidate old tags.
2992 struct yaffs_ext_tags prev_tags
;
2994 struct yaffs_ext_tags new_tags
;
2995 struct yaffs_dev
*dev
= in
->my_dev
;
2997 yaffs_check_gc(dev
, 0);
2999 /* Get the previous chunk at this location in the file if it exists.
3000 * If it does not exist then put a zero into the tree. This creates
3001 * the tnode now, rather than later when it is harder to clean up.
3003 prev_chunk_id
= yaffs_find_chunk_in_file(in
, inode_chunk
, &prev_tags
);
3004 if (prev_chunk_id
< 1 &&
3005 !yaffs_put_chunk_in_file(in
, inode_chunk
, 0, 0))
3008 /* Set up new tags */
3009 memset(&new_tags
, 0, sizeof(new_tags
));
3011 new_tags
.chunk_id
= inode_chunk
;
3012 new_tags
.obj_id
= in
->obj_id
;
3013 new_tags
.serial_number
=
3014 (prev_chunk_id
> 0) ? prev_tags
.serial_number
+ 1 : 1;
3015 new_tags
.n_bytes
= n_bytes
;
3017 if (n_bytes
< 1 || n_bytes
> dev
->param
.total_bytes_per_chunk
) {
3018 yaffs_trace(YAFFS_TRACE_ERROR
,
3019 "Writing %d bytes to chunk!!!!!!!!!",
3025 yaffs_write_new_chunk(dev
, buffer
, &new_tags
, use_reserve
);
3027 if (new_chunk_id
> 0) {
3028 yaffs_put_chunk_in_file(in
, inode_chunk
, new_chunk_id
, 0);
3030 if (prev_chunk_id
> 0)
3031 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3033 yaffs_verify_file_sane(in
);
3035 return new_chunk_id
;
3041 static int yaffs_do_xattrib_mod(struct yaffs_obj
*obj
, int set
,
3042 const YCHAR
*name
, const void *value
, int size
,
3045 struct yaffs_xattr_mod xmod
;
3053 xmod
.result
= -ENOSPC
;
3055 result
= yaffs_update_oh(obj
, NULL
, 0, 0, 0, &xmod
);
3063 static int yaffs_apply_xattrib_mod(struct yaffs_obj
*obj
, char *buffer
,
3064 struct yaffs_xattr_mod
*xmod
)
3067 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3068 struct yaffs_dev
*dev
= obj
->my_dev
;
3069 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3070 char *x_buffer
= buffer
+ x_offs
;
3074 nval_set(x_buffer
, x_size
, xmod
->name
, xmod
->data
,
3075 xmod
->size
, xmod
->flags
);
3077 retval
= nval_del(x_buffer
, x_size
, xmod
->name
);
3079 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3080 obj
->xattr_known
= 1;
3081 xmod
->result
= retval
;
3086 static int yaffs_do_xattrib_fetch(struct yaffs_obj
*obj
, const YCHAR
*name
,
3087 void *value
, int size
)
3089 char *buffer
= NULL
;
3091 struct yaffs_ext_tags tags
;
3092 struct yaffs_dev
*dev
= obj
->my_dev
;
3093 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3094 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3098 if (obj
->hdr_chunk
< 1)
3101 /* If we know that the object has no xattribs then don't do all the
3102 * reading and parsing.
3104 if (obj
->xattr_known
&& !obj
->has_xattr
) {
3111 buffer
= (char *)yaffs_get_temp_buffer(dev
);
3116 yaffs_rd_chunk_tags_nand(dev
, obj
->hdr_chunk
, (u8
*) buffer
, &tags
);
3118 if (result
!= YAFFS_OK
)
3121 x_buffer
= buffer
+ x_offs
;
3123 if (!obj
->xattr_known
) {
3124 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3125 obj
->xattr_known
= 1;
3129 retval
= nval_get(x_buffer
, x_size
, name
, value
, size
);
3131 retval
= nval_list(x_buffer
, x_size
, value
, size
);
3133 yaffs_release_temp_buffer(dev
, (u8
*) buffer
);
3137 int yaffs_set_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
,
3138 const void *value
, int size
, int flags
)
3140 return yaffs_do_xattrib_mod(obj
, 1, name
, value
, size
, flags
);
3143 int yaffs_remove_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
)
3145 return yaffs_do_xattrib_mod(obj
, 0, name
, NULL
, 0, 0);
3148 int yaffs_get_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
, void *value
,
3151 return yaffs_do_xattrib_fetch(obj
, name
, value
, size
);
3154 int yaffs_list_xattrib(struct yaffs_obj
*obj
, char *buffer
, int size
)
3156 return yaffs_do_xattrib_fetch(obj
, NULL
, buffer
, size
);
3159 static void yaffs_check_obj_details_loaded(struct yaffs_obj
*in
)
3162 struct yaffs_obj_hdr
*oh
;
3163 struct yaffs_dev
*dev
;
3164 struct yaffs_ext_tags tags
;
3166 if (!in
|| !in
->lazy_loaded
|| in
->hdr_chunk
< 1)
3170 in
->lazy_loaded
= 0;
3171 buf
= yaffs_get_temp_buffer(dev
);
3173 yaffs_rd_chunk_tags_nand(dev
, in
->hdr_chunk
, buf
, &tags
);
3174 oh
= (struct yaffs_obj_hdr
*)buf
;
3176 in
->yst_mode
= oh
->yst_mode
;
3177 yaffs_load_attribs(in
, oh
);
3178 yaffs_set_obj_name_from_oh(in
, oh
);
3180 if (in
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
3181 in
->variant
.symlink_variant
.alias
=
3182 yaffs_clone_str(oh
->alias
);
3184 yaffs_release_temp_buffer(dev
, buf
);
3187 static void yaffs_load_name_from_oh(struct yaffs_dev
*dev
, YCHAR
*name
,
3188 const YCHAR
*oh_name
, int buff_size
)
3190 #ifdef CONFIG_YAFFS_AUTO_UNICODE
3191 if (dev
->param
.auto_unicode
) {
3193 /* It is an ASCII name, do an ASCII to
3194 * unicode conversion */
3195 const char *ascii_oh_name
= (const char *)oh_name
;
3196 int n
= buff_size
- 1;
3197 while (n
> 0 && *ascii_oh_name
) {
3198 *name
= *ascii_oh_name
;
3204 yaffs_strncpy(name
, oh_name
+ 1, buff_size
- 1);
3211 yaffs_strncpy(name
, oh_name
, buff_size
- 1);
3214 static void yaffs_load_oh_from_name(struct yaffs_dev
*dev
, YCHAR
*oh_name
,
3217 #ifdef CONFIG_YAFFS_AUTO_UNICODE
3221 if (dev
->param
.auto_unicode
) {
3226 /* Figure out if the name will fit in ascii character set */
3227 while (is_ascii
&& *w
) {
3234 /* It is an ASCII name, so convert unicode to ascii */
3235 char *ascii_oh_name
= (char *)oh_name
;
3236 int n
= YAFFS_MAX_NAME_LENGTH
- 1;
3237 while (n
> 0 && *name
) {
3238 *ascii_oh_name
= *name
;
3244 /* Unicode name, so save starting at the second YCHAR */
3246 yaffs_strncpy(oh_name
+ 1, name
, YAFFS_MAX_NAME_LENGTH
- 2);
3253 yaffs_strncpy(oh_name
, name
, YAFFS_MAX_NAME_LENGTH
- 1);
3256 /* UpdateObjectHeader updates the header on NAND for an object.
3257 * If name is not NULL, then that new name is used.
3259 int yaffs_update_oh(struct yaffs_obj
*in
, const YCHAR
*name
, int force
,
3260 int is_shrink
, int shadows
, struct yaffs_xattr_mod
*xmod
)
3263 struct yaffs_block_info
*bi
;
3264 struct yaffs_dev
*dev
= in
->my_dev
;
3268 struct yaffs_ext_tags new_tags
;
3269 struct yaffs_ext_tags old_tags
;
3270 const YCHAR
*alias
= NULL
;
3272 YCHAR old_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
3273 struct yaffs_obj_hdr
*oh
= NULL
;
3274 loff_t file_size
= 0;
3276 yaffs_strcpy(old_name
, _Y("silly old name"));
3278 if (in
->fake
&& in
!= dev
->root_dir
&& !force
&& !xmod
)
3281 yaffs_check_gc(dev
, 0);
3282 yaffs_check_obj_details_loaded(in
);
3284 buffer
= yaffs_get_temp_buffer(in
->my_dev
);
3285 oh
= (struct yaffs_obj_hdr
*)buffer
;
3287 prev_chunk_id
= in
->hdr_chunk
;
3289 if (prev_chunk_id
> 0) {
3290 yaffs_rd_chunk_tags_nand(dev
, prev_chunk_id
,
3293 yaffs_verify_oh(in
, oh
, &old_tags
, 0);
3294 memcpy(old_name
, oh
->name
, sizeof(oh
->name
));
3295 memset(buffer
, 0xff, sizeof(struct yaffs_obj_hdr
));
3297 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
3300 oh
->type
= in
->variant_type
;
3301 oh
->yst_mode
= in
->yst_mode
;
3302 oh
->shadows_obj
= oh
->inband_shadowed_obj_id
= shadows
;
3304 yaffs_load_attribs_oh(oh
, in
);
3307 oh
->parent_obj_id
= in
->parent
->obj_id
;
3309 oh
->parent_obj_id
= 0;
3311 if (name
&& *name
) {
3312 memset(oh
->name
, 0, sizeof(oh
->name
));
3313 yaffs_load_oh_from_name(dev
, oh
->name
, name
);
3314 } else if (prev_chunk_id
> 0) {
3315 memcpy(oh
->name
, old_name
, sizeof(oh
->name
));
3317 memset(oh
->name
, 0, sizeof(oh
->name
));
3320 oh
->is_shrink
= is_shrink
;
3322 switch (in
->variant_type
) {
3323 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3324 /* Should not happen */
3326 case YAFFS_OBJECT_TYPE_FILE
:
3327 if (oh
->parent_obj_id
!= YAFFS_OBJECTID_DELETED
&&
3328 oh
->parent_obj_id
!= YAFFS_OBJECTID_UNLINKED
)
3329 file_size
= in
->variant
.file_variant
.file_size
;
3330 yaffs_oh_size_load(oh
, file_size
);
3332 case YAFFS_OBJECT_TYPE_HARDLINK
:
3333 oh
->equiv_id
= in
->variant
.hardlink_variant
.equiv_id
;
3335 case YAFFS_OBJECT_TYPE_SPECIAL
:
3338 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3341 case YAFFS_OBJECT_TYPE_SYMLINK
:
3342 alias
= in
->variant
.symlink_variant
.alias
;
3344 alias
= _Y("no alias");
3345 yaffs_strncpy(oh
->alias
, alias
, YAFFS_MAX_ALIAS_LENGTH
);
3346 oh
->alias
[YAFFS_MAX_ALIAS_LENGTH
] = 0;
3350 /* process any xattrib modifications */
3352 yaffs_apply_xattrib_mod(in
, (char *)buffer
, xmod
);
3355 memset(&new_tags
, 0, sizeof(new_tags
));
3357 new_tags
.chunk_id
= 0;
3358 new_tags
.obj_id
= in
->obj_id
;
3359 new_tags
.serial_number
= in
->serial
;
3361 /* Add extra info for file header */
3362 new_tags
.extra_available
= 1;
3363 new_tags
.extra_parent_id
= oh
->parent_obj_id
;
3364 new_tags
.extra_file_size
= file_size
;
3365 new_tags
.extra_is_shrink
= oh
->is_shrink
;
3366 new_tags
.extra_equiv_id
= oh
->equiv_id
;
3367 new_tags
.extra_shadows
= (oh
->shadows_obj
> 0) ? 1 : 0;
3368 new_tags
.extra_obj_type
= in
->variant_type
;
3369 yaffs_verify_oh(in
, oh
, &new_tags
, 1);
3371 /* Create new chunk in NAND */
3373 yaffs_write_new_chunk(dev
, buffer
, &new_tags
,
3374 (prev_chunk_id
> 0) ? 1 : 0);
3377 yaffs_release_temp_buffer(dev
, buffer
);
3379 if (new_chunk_id
< 0)
3380 return new_chunk_id
;
3382 in
->hdr_chunk
= new_chunk_id
;
3384 if (prev_chunk_id
> 0)
3385 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3387 if (!yaffs_obj_cache_dirty(in
))
3390 /* If this was a shrink, then mark the block
3391 * that the chunk lives on */
3393 bi
= yaffs_get_block_info(in
->my_dev
,
3395 in
->my_dev
->param
.chunks_per_block
);
3396 bi
->has_shrink_hdr
= 1;
3400 return new_chunk_id
;
3403 /*--------------------- File read/write ------------------------
3404 * Read and write have very similar structures.
3405 * In general the read/write has three parts to it
3406 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3407 * Some complete chunks
3408 * An incomplete chunk to end off with
3410 * Curve-balls: the first chunk might also be the last chunk.
3413 int yaffs_file_rd(struct yaffs_obj
*in
, u8
* buffer
, loff_t offset
, int n_bytes
)
3420 struct yaffs_cache
*cache
;
3421 struct yaffs_dev
*dev
;
3426 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3429 /* OK now check for the curveball where the start and end are in
3432 if ((start
+ n
) < dev
->data_bytes_per_chunk
)
3435 n_copy
= dev
->data_bytes_per_chunk
- start
;
3437 cache
= yaffs_find_chunk_cache(in
, chunk
);
3439 /* If the chunk is already in the cache or it is less than
3440 * a whole chunk or we're using inband tags then use the cache
3441 * (if there is caching) else bypass the cache.
3443 if (cache
|| n_copy
!= dev
->data_bytes_per_chunk
||
3444 dev
->param
.inband_tags
) {
3445 if (dev
->param
.n_caches
> 0) {
3447 /* If we can't find the data in the cache,
3448 * then load it up. */
3452 yaffs_grab_chunk_cache(in
->my_dev
);
3454 cache
->chunk_id
= chunk
;
3457 yaffs_rd_data_obj(in
, chunk
,
3462 yaffs_use_cache(dev
, cache
, 0);
3466 memcpy(buffer
, &cache
->data
[start
], n_copy
);
3470 /* Read into the local buffer then copy.. */
3473 yaffs_get_temp_buffer(dev
);
3474 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3476 memcpy(buffer
, &local_buffer
[start
], n_copy
);
3478 yaffs_release_temp_buffer(dev
, local_buffer
);
3481 /* A full chunk. Read directly into the buffer. */
3482 yaffs_rd_data_obj(in
, chunk
, buffer
);
3492 int yaffs_do_file_wr(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3493 int n_bytes
, int write_through
)
3502 loff_t start_write
= offset
;
3503 int chunk_written
= 0;
3506 struct yaffs_dev
*dev
;
3510 while (n
> 0 && chunk_written
>= 0) {
3511 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3513 if (((loff_t
)chunk
) *
3514 dev
->data_bytes_per_chunk
+ start
!= offset
||
3515 start
>= dev
->data_bytes_per_chunk
) {
3516 yaffs_trace(YAFFS_TRACE_ERROR
,
3517 "AddrToChunk of offset %lld gives chunk %d start %d",
3518 offset
, chunk
, start
);
3520 chunk
++; /* File pos to chunk in file offset */
3522 /* OK now check for the curveball where the start and end are in
3526 if ((start
+ n
) < dev
->data_bytes_per_chunk
) {
3529 /* Now calculate how many bytes to write back....
3530 * If we're overwriting and not writing to then end of
3531 * file then we need to write back as much as was there
3535 chunk_start
= (((loff_t
)(chunk
- 1)) *
3536 dev
->data_bytes_per_chunk
);
3538 if (chunk_start
> in
->variant
.file_variant
.file_size
)
3539 n_bytes_read
= 0; /* Past end of file */
3542 in
->variant
.file_variant
.file_size
-
3545 if (n_bytes_read
> dev
->data_bytes_per_chunk
)
3546 n_bytes_read
= dev
->data_bytes_per_chunk
;
3550 (start
+ n
)) ? n_bytes_read
: (start
+ n
);
3552 if (n_writeback
< 0 ||
3553 n_writeback
> dev
->data_bytes_per_chunk
)
3557 n_copy
= dev
->data_bytes_per_chunk
- start
;
3558 n_writeback
= dev
->data_bytes_per_chunk
;
3561 if (n_copy
!= dev
->data_bytes_per_chunk
||
3562 dev
->param
.inband_tags
) {
3563 /* An incomplete start or end chunk (or maybe both
3564 * start and end chunk), or we're using inband tags,
3565 * so we want to use the cache buffers.
3567 if (dev
->param
.n_caches
> 0) {
3568 struct yaffs_cache
*cache
;
3570 /* If we can't find the data in the cache, then
3572 cache
= yaffs_find_chunk_cache(in
, chunk
);
3575 yaffs_check_alloc_available(dev
, 1)) {
3576 cache
= yaffs_grab_chunk_cache(dev
);
3578 cache
->chunk_id
= chunk
;
3581 yaffs_rd_data_obj(in
, chunk
,
3585 !yaffs_check_alloc_available(dev
,
3587 /* Drop the cache if it was a read cache
3588 * item and no space check has been made
3595 yaffs_use_cache(dev
, cache
, 1);
3598 memcpy(&cache
->data
[start
], buffer
,
3602 cache
->n_bytes
= n_writeback
;
3604 if (write_through
) {
3614 chunk_written
= -1; /* fail write */
3617 /* An incomplete start or end chunk (or maybe
3618 * both start and end chunk). Read into the
3619 * local buffer then copy over and write back.
3622 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3624 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3625 memcpy(&local_buffer
[start
], buffer
, n_copy
);
3628 yaffs_wr_data_obj(in
, chunk
,
3632 yaffs_release_temp_buffer(dev
, local_buffer
);
3635 /* A full chunk. Write directly from the buffer. */
3638 yaffs_wr_data_obj(in
, chunk
, buffer
,
3639 dev
->data_bytes_per_chunk
, 0);
3641 /* Since we've overwritten the cached data,
3642 * we better invalidate it. */
3643 yaffs_invalidate_chunk_cache(in
, chunk
);
3646 if (chunk_written
>= 0) {
3654 /* Update file object */
3656 if ((start_write
+ n_done
) > in
->variant
.file_variant
.file_size
)
3657 in
->variant
.file_variant
.file_size
= (start_write
+ n_done
);
3663 int yaffs_wr_file(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3664 int n_bytes
, int write_through
)
3666 yaffs2_handle_hole(in
, offset
);
3667 return yaffs_do_file_wr(in
, buffer
, offset
, n_bytes
, write_through
);
3670 /* ---------------------- File resizing stuff ------------------ */
3672 static void yaffs_prune_chunks(struct yaffs_obj
*in
, loff_t new_size
)
3675 struct yaffs_dev
*dev
= in
->my_dev
;
3676 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3684 yaffs_addr_to_chunk(dev
, old_size
- 1, &last_del
, &dummy
);
3688 yaffs_addr_to_chunk(dev
, new_size
+ dev
->data_bytes_per_chunk
- 1,
3689 &start_del
, &dummy
);
3693 /* Delete backwards so that we don't end up with holes if
3694 * power is lost part-way through the operation.
3696 for (i
= last_del
; i
>= start_del
; i
--) {
3697 /* NB this could be optimised somewhat,
3698 * eg. could retrieve the tags and write them without
3699 * using yaffs_chunk_del
3702 chunk_id
= yaffs_find_del_file_chunk(in
, i
, NULL
);
3708 (dev
->internal_start_block
* dev
->param
.chunks_per_block
) ||
3710 ((dev
->internal_end_block
+ 1) *
3711 dev
->param
.chunks_per_block
)) {
3712 yaffs_trace(YAFFS_TRACE_ALWAYS
,
3713 "Found daft chunk_id %d for %d",
3716 in
->n_data_chunks
--;
3717 yaffs_chunk_del(dev
, chunk_id
, 1, __LINE__
);
3722 void yaffs_resize_file_down(struct yaffs_obj
*obj
, loff_t new_size
)
3726 struct yaffs_dev
*dev
= obj
->my_dev
;
3728 yaffs_addr_to_chunk(dev
, new_size
, &new_full
, &new_partial
);
3730 yaffs_prune_chunks(obj
, new_size
);
3732 if (new_partial
!= 0) {
3733 int last_chunk
= 1 + new_full
;
3734 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3736 /* Rewrite the last chunk with its new size and zero pad */
3737 yaffs_rd_data_obj(obj
, last_chunk
, local_buffer
);
3738 memset(local_buffer
+ new_partial
, 0,
3739 dev
->data_bytes_per_chunk
- new_partial
);
3741 yaffs_wr_data_obj(obj
, last_chunk
, local_buffer
,
3744 yaffs_release_temp_buffer(dev
, local_buffer
);
3747 obj
->variant
.file_variant
.file_size
= new_size
;
3749 yaffs_prune_tree(dev
, &obj
->variant
.file_variant
);
3752 int yaffs_resize_file(struct yaffs_obj
*in
, loff_t new_size
)
3754 struct yaffs_dev
*dev
= in
->my_dev
;
3755 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3757 yaffs_flush_file_cache(in
);
3758 yaffs_invalidate_whole_cache(in
);
3760 yaffs_check_gc(dev
, 0);
3762 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
)
3765 if (new_size
== old_size
)
3768 if (new_size
> old_size
) {
3769 yaffs2_handle_hole(in
, new_size
);
3770 in
->variant
.file_variant
.file_size
= new_size
;
3772 /* new_size < old_size */
3773 yaffs_resize_file_down(in
, new_size
);
3776 /* Write a new object header to reflect the resize.
3777 * show we've shrunk the file, if need be
3778 * Do this only if the file is not in the deleted directories
3779 * and is not shadowed.
3783 in
->parent
->obj_id
!= YAFFS_OBJECTID_UNLINKED
&&
3784 in
->parent
->obj_id
!= YAFFS_OBJECTID_DELETED
)
3785 yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
);
3790 int yaffs_flush_file(struct yaffs_obj
*in
, int update_time
, int data_sync
)
3795 yaffs_flush_file_cache(in
);
3801 yaffs_load_current_time(in
, 0, 0);
3803 return (yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
) >= 0) ?
3804 YAFFS_OK
: YAFFS_FAIL
;
3808 /* yaffs_del_file deletes the whole file data
3809 * and the inode associated with the file.
3810 * It does not delete the links associated with the file.
3812 static int yaffs_unlink_file_if_needed(struct yaffs_obj
*in
)
3816 struct yaffs_dev
*dev
= in
->my_dev
;
3823 yaffs_change_obj_name(in
, in
->my_dev
->del_dir
,
3824 _Y("deleted"), 0, 0);
3825 yaffs_trace(YAFFS_TRACE_TRACING
,
3826 "yaffs: immediate deletion of file %d",
3829 in
->my_dev
->n_deleted_files
++;
3830 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3831 yaffs_resize_file(in
, 0);
3832 yaffs_soft_del_file(in
);
3835 yaffs_change_obj_name(in
, in
->my_dev
->unlinked_dir
,
3836 _Y("unlinked"), 0, 0);
3841 int yaffs_del_file(struct yaffs_obj
*in
)
3843 int ret_val
= YAFFS_OK
;
3844 int deleted
; /* Need to cache value on stack if in is freed */
3845 struct yaffs_dev
*dev
= in
->my_dev
;
3847 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3848 yaffs_resize_file(in
, 0);
3850 if (in
->n_data_chunks
> 0) {
3851 /* Use soft deletion if there is data in the file.
3852 * That won't be the case if it has been resized to zero.
3855 ret_val
= yaffs_unlink_file_if_needed(in
);
3857 deleted
= in
->deleted
;
3859 if (ret_val
== YAFFS_OK
&& in
->unlinked
&& !in
->deleted
) {
3862 in
->my_dev
->n_deleted_files
++;
3863 yaffs_soft_del_file(in
);
3865 return deleted
? YAFFS_OK
: YAFFS_FAIL
;
3867 /* The file has no data chunks so we toss it immediately */
3868 yaffs_free_tnode(in
->my_dev
, in
->variant
.file_variant
.top
);
3869 in
->variant
.file_variant
.top
= NULL
;
3870 yaffs_generic_obj_del(in
);
3876 int yaffs_is_non_empty_dir(struct yaffs_obj
*obj
)
3879 obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
) &&
3880 !(list_empty(&obj
->variant
.dir_variant
.children
));
3883 static int yaffs_del_dir(struct yaffs_obj
*obj
)
3885 /* First check that the directory is empty. */
3886 if (yaffs_is_non_empty_dir(obj
))
3889 return yaffs_generic_obj_del(obj
);
3892 static int yaffs_del_symlink(struct yaffs_obj
*in
)
3894 kfree(in
->variant
.symlink_variant
.alias
);
3895 in
->variant
.symlink_variant
.alias
= NULL
;
3897 return yaffs_generic_obj_del(in
);
3900 static int yaffs_del_link(struct yaffs_obj
*in
)
3902 /* remove this hardlink from the list associated with the equivalent
3905 list_del_init(&in
->hard_links
);
3906 return yaffs_generic_obj_del(in
);
3909 int yaffs_del_obj(struct yaffs_obj
*obj
)
3913 switch (obj
->variant_type
) {
3914 case YAFFS_OBJECT_TYPE_FILE
:
3915 ret_val
= yaffs_del_file(obj
);
3917 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3918 if (!list_empty(&obj
->variant
.dir_variant
.dirty
)) {
3919 yaffs_trace(YAFFS_TRACE_BACKGROUND
,
3920 "Remove object %d from dirty directories",
3922 list_del_init(&obj
->variant
.dir_variant
.dirty
);
3924 return yaffs_del_dir(obj
);
3926 case YAFFS_OBJECT_TYPE_SYMLINK
:
3927 ret_val
= yaffs_del_symlink(obj
);
3929 case YAFFS_OBJECT_TYPE_HARDLINK
:
3930 ret_val
= yaffs_del_link(obj
);
3932 case YAFFS_OBJECT_TYPE_SPECIAL
:
3933 ret_val
= yaffs_generic_obj_del(obj
);
3935 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3937 break; /* should not happen. */
3942 static int yaffs_unlink_worker(struct yaffs_obj
*obj
)
3952 yaffs_update_parent(obj
->parent
);
3954 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
3955 return yaffs_del_link(obj
);
3956 } else if (!list_empty(&obj
->hard_links
)) {
3957 /* Curve ball: We're unlinking an object that has a hardlink.
3959 * This problem arises because we are not strictly following
3960 * The Linux link/inode model.
3962 * We can't really delete the object.
3963 * Instead, we do the following:
3964 * - Select a hardlink.
3965 * - Unhook it from the hard links
3966 * - Move it from its parent directory so that the rename works.
3967 * - Rename the object to the hardlink's name.
3968 * - Delete the hardlink
3971 struct yaffs_obj
*hl
;
3972 struct yaffs_obj
*parent
;
3974 YCHAR name
[YAFFS_MAX_NAME_LENGTH
+ 1];
3976 hl
= list_entry(obj
->hard_links
.next
, struct yaffs_obj
,
3979 yaffs_get_obj_name(hl
, name
, YAFFS_MAX_NAME_LENGTH
+ 1);
3980 parent
= hl
->parent
;
3982 list_del_init(&hl
->hard_links
);
3984 yaffs_add_obj_to_dir(obj
->my_dev
->unlinked_dir
, hl
);
3986 ret_val
= yaffs_change_obj_name(obj
, parent
, name
, 0, 0);
3988 if (ret_val
== YAFFS_OK
)
3989 ret_val
= yaffs_generic_obj_del(hl
);
3993 } else if (del_now
) {
3994 switch (obj
->variant_type
) {
3995 case YAFFS_OBJECT_TYPE_FILE
:
3996 return yaffs_del_file(obj
);
3998 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3999 list_del_init(&obj
->variant
.dir_variant
.dirty
);
4000 return yaffs_del_dir(obj
);
4002 case YAFFS_OBJECT_TYPE_SYMLINK
:
4003 return yaffs_del_symlink(obj
);
4005 case YAFFS_OBJECT_TYPE_SPECIAL
:
4006 return yaffs_generic_obj_del(obj
);
4008 case YAFFS_OBJECT_TYPE_HARDLINK
:
4009 case YAFFS_OBJECT_TYPE_UNKNOWN
:
4013 } else if (yaffs_is_non_empty_dir(obj
)) {
4016 return yaffs_change_obj_name(obj
, obj
->my_dev
->unlinked_dir
,
4017 _Y("unlinked"), 0, 0);
4021 static int yaffs_unlink_obj(struct yaffs_obj
*obj
)
4023 if (obj
&& obj
->unlink_allowed
)
4024 return yaffs_unlink_worker(obj
);
4029 int yaffs_unlinker(struct yaffs_obj
*dir
, const YCHAR
*name
)
4031 struct yaffs_obj
*obj
;
4033 obj
= yaffs_find_by_name(dir
, name
);
4034 return yaffs_unlink_obj(obj
);
4038 * If old_name is NULL then we take old_dir as the object to be renamed.
4040 int yaffs_rename_obj(struct yaffs_obj
*old_dir
, const YCHAR
*old_name
,
4041 struct yaffs_obj
*new_dir
, const YCHAR
*new_name
)
4043 struct yaffs_obj
*obj
= NULL
;
4044 struct yaffs_obj
*existing_target
= NULL
;
4047 struct yaffs_dev
*dev
;
4049 if (!old_dir
|| old_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4053 if (!new_dir
|| new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4058 dev
= old_dir
->my_dev
;
4060 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4061 /* Special case for case insemsitive systems.
4062 * While look-up is case insensitive, the name isn't.
4063 * Therefore we might want to change x.txt to X.txt
4065 if (old_dir
== new_dir
&&
4066 old_name
&& new_name
&&
4067 yaffs_strcmp(old_name
, new_name
) == 0)
4071 if (yaffs_strnlen(new_name
, YAFFS_MAX_NAME_LENGTH
+ 1) >
4072 YAFFS_MAX_NAME_LENGTH
)
4077 obj
= yaffs_find_by_name(old_dir
, old_name
);
4080 old_dir
= obj
->parent
;
4083 if (obj
&& obj
->rename_allowed
) {
4084 /* Now handle an existing target, if there is one */
4085 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
4086 if (yaffs_is_non_empty_dir(existing_target
)) {
4087 return YAFFS_FAIL
; /* ENOTEMPTY */
4088 } else if (existing_target
&& existing_target
!= obj
) {
4089 /* Nuke the target first, using shadowing,
4090 * but only if it isn't the same object.
4092 * Note we must disable gc here otherwise it can mess
4096 dev
->gc_disable
= 1;
4097 yaffs_change_obj_name(obj
, new_dir
, new_name
, force
,
4098 existing_target
->obj_id
);
4099 existing_target
->is_shadowed
= 1;
4100 yaffs_unlink_obj(existing_target
);
4101 dev
->gc_disable
= 0;
4104 result
= yaffs_change_obj_name(obj
, new_dir
, new_name
, 1, 0);
4106 yaffs_update_parent(old_dir
);
4107 if (new_dir
!= old_dir
)
4108 yaffs_update_parent(new_dir
);
4115 /*----------------------- Initialisation Scanning ---------------------- */
4117 void yaffs_handle_shadowed_obj(struct yaffs_dev
*dev
, int obj_id
,
4118 int backward_scanning
)
4120 struct yaffs_obj
*obj
;
4122 if (backward_scanning
) {
4123 /* Handle YAFFS2 case (backward scanning)
4124 * If the shadowed object exists then ignore.
4126 obj
= yaffs_find_by_number(dev
, obj_id
);
4131 /* Let's create it (if it does not exist) assuming it is a file so that
4132 * it can do shrinking etc.
4133 * We put it in unlinked dir to be cleaned up after the scanning
4136 yaffs_find_or_create_by_number(dev
, obj_id
, YAFFS_OBJECT_TYPE_FILE
);
4139 obj
->is_shadowed
= 1;
4140 yaffs_add_obj_to_dir(dev
->unlinked_dir
, obj
);
4141 obj
->variant
.file_variant
.shrink_size
= 0;
4142 obj
->valid
= 1; /* So that we don't read any other info. */
4145 void yaffs_link_fixup(struct yaffs_dev
*dev
, struct list_head
*hard_list
)
4147 struct list_head
*lh
;
4148 struct list_head
*save
;
4149 struct yaffs_obj
*hl
;
4150 struct yaffs_obj
*in
;
4152 list_for_each_safe(lh
, save
, hard_list
) {
4153 hl
= list_entry(lh
, struct yaffs_obj
, hard_links
);
4154 in
= yaffs_find_by_number(dev
,
4155 hl
->variant
.hardlink_variant
.equiv_id
);
4158 /* Add the hardlink pointers */
4159 hl
->variant
.hardlink_variant
.equiv_obj
= in
;
4160 list_add(&hl
->hard_links
, &in
->hard_links
);
4162 /* Todo Need to report/handle this better.
4163 * Got a problem... hardlink to a non-existant object
4165 hl
->variant
.hardlink_variant
.equiv_obj
= NULL
;
4166 INIT_LIST_HEAD(&hl
->hard_links
);
4171 static void yaffs_strip_deleted_objs(struct yaffs_dev
*dev
)
4174 * Sort out state of unlinked and deleted objects after scanning.
4176 struct list_head
*i
;
4177 struct list_head
*n
;
4178 struct yaffs_obj
*l
;
4183 /* Soft delete all the unlinked files */
4184 list_for_each_safe(i
, n
,
4185 &dev
->unlinked_dir
->variant
.dir_variant
.children
) {
4186 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4190 list_for_each_safe(i
, n
, &dev
->del_dir
->variant
.dir_variant
.children
) {
4191 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4197 * This code iterates through all the objects making sure that they are rooted.
4198 * Any unrooted objects are re-rooted in lost+found.
4199 * An object needs to be in one of:
4200 * - Directly under deleted, unlinked
4201 * - Directly or indirectly under root.
4204 * This code assumes that we don't ever change the current relationships
4205 * between directories:
4206 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4207 * lost-n-found->parent == root_dir
4209 * This fixes the problem where directories might have inadvertently been
4210 * deleted leaving the object "hanging" without being rooted in the
4214 static int yaffs_has_null_parent(struct yaffs_dev
*dev
, struct yaffs_obj
*obj
)
4216 return (obj
== dev
->del_dir
||
4217 obj
== dev
->unlinked_dir
|| obj
== dev
->root_dir
);
4220 static void yaffs_fix_hanging_objs(struct yaffs_dev
*dev
)
4222 struct yaffs_obj
*obj
;
4223 struct yaffs_obj
*parent
;
4225 struct list_head
*lh
;
4226 struct list_head
*n
;
4233 /* Iterate through the objects in each hash entry,
4234 * looking at each object.
4235 * Make sure it is rooted.
4238 for (i
= 0; i
< YAFFS_NOBJECT_BUCKETS
; i
++) {
4239 list_for_each_safe(lh
, n
, &dev
->obj_bucket
[i
].list
) {
4240 obj
= list_entry(lh
, struct yaffs_obj
, hash_link
);
4241 parent
= obj
->parent
;
4243 if (yaffs_has_null_parent(dev
, obj
)) {
4244 /* These directories are not hanging */
4246 } else if (!parent
||
4247 parent
->variant_type
!=
4248 YAFFS_OBJECT_TYPE_DIRECTORY
) {
4250 } else if (yaffs_has_null_parent(dev
, parent
)) {
4254 * Need to follow the parent chain to
4255 * see if it is hanging.
4260 while (parent
!= dev
->root_dir
&&
4262 parent
->parent
->variant_type
==
4263 YAFFS_OBJECT_TYPE_DIRECTORY
&&
4265 parent
= parent
->parent
;
4268 if (parent
!= dev
->root_dir
)
4272 yaffs_trace(YAFFS_TRACE_SCAN
,
4273 "Hanging object %d moved to lost and found",
4275 yaffs_add_obj_to_dir(dev
->lost_n_found
, obj
);
4282 * Delete directory contents for cleaning up lost and found.
4284 static void yaffs_del_dir_contents(struct yaffs_obj
*dir
)
4286 struct yaffs_obj
*obj
;
4287 struct list_head
*lh
;
4288 struct list_head
*n
;
4290 if (dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
4293 list_for_each_safe(lh
, n
, &dir
->variant
.dir_variant
.children
) {
4294 obj
= list_entry(lh
, struct yaffs_obj
, siblings
);
4295 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
)
4296 yaffs_del_dir_contents(obj
);
4297 yaffs_trace(YAFFS_TRACE_SCAN
,
4298 "Deleting lost_found object %d",
4300 yaffs_unlink_obj(obj
);
4304 static void yaffs_empty_l_n_f(struct yaffs_dev
*dev
)
4306 yaffs_del_dir_contents(dev
->lost_n_found
);
4310 struct yaffs_obj
*yaffs_find_by_name(struct yaffs_obj
*directory
,
4314 struct list_head
*i
;
4315 YCHAR buffer
[YAFFS_MAX_NAME_LENGTH
+ 1];
4316 struct yaffs_obj
*l
;
4322 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4323 "tragedy: yaffs_find_by_name: null pointer directory"
4328 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4329 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4330 "tragedy: yaffs_find_by_name: non-directory"
4335 sum
= yaffs_calc_name_sum(name
);
4337 list_for_each(i
, &directory
->variant
.dir_variant
.children
) {
4338 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4340 if (l
->parent
!= directory
)
4343 yaffs_check_obj_details_loaded(l
);
4345 /* Special case for lost-n-found */
4346 if (l
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4347 if (!yaffs_strcmp(name
, YAFFS_LOSTNFOUND_NAME
))
4349 } else if (l
->sum
== sum
|| l
->hdr_chunk
<= 0) {
4350 /* LostnFound chunk called Objxxx
4353 yaffs_get_obj_name(l
, buffer
,
4354 YAFFS_MAX_NAME_LENGTH
+ 1);
4355 if (!yaffs_strncmp(name
, buffer
, YAFFS_MAX_NAME_LENGTH
))
4362 /* GetEquivalentObject dereferences any hard links to get to the
4366 struct yaffs_obj
*yaffs_get_equivalent_obj(struct yaffs_obj
*obj
)
4368 if (obj
&& obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
4369 obj
= obj
->variant
.hardlink_variant
.equiv_obj
;
4370 yaffs_check_obj_details_loaded(obj
);
4376 * A note or two on object names.
4377 * * If the object name is missing, we then make one up in the form objnnn
4379 * * ASCII names are stored in the object header's name field from byte zero
4380 * * Unicode names are historically stored starting from byte zero.
4382 * Then there are automatic Unicode names...
4383 * The purpose of these is to save names in a way that can be read as
4384 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4385 * system to share files.
4387 * These automatic unicode are stored slightly differently...
4388 * - If the name can fit in the ASCII character space then they are saved as
4389 * ascii names as per above.
4390 * - If the name needs Unicode then the name is saved in Unicode
4391 * starting at oh->name[1].
4394 static void yaffs_fix_null_name(struct yaffs_obj
*obj
, YCHAR
*name
,
4397 /* Create an object name if we could not find one. */
4398 if (yaffs_strnlen(name
, YAFFS_MAX_NAME_LENGTH
) == 0) {
4399 YCHAR local_name
[20];
4400 YCHAR num_string
[20];
4401 YCHAR
*x
= &num_string
[19];
4402 unsigned v
= obj
->obj_id
;
4406 *x
= '0' + (v
% 10);
4409 /* make up a name */
4410 yaffs_strcpy(local_name
, YAFFS_LOSTNFOUND_PREFIX
);
4411 yaffs_strcat(local_name
, x
);
4412 yaffs_strncpy(name
, local_name
, buffer_size
- 1);
4416 int yaffs_get_obj_name(struct yaffs_obj
*obj
, YCHAR
*name
, int buffer_size
)
4418 memset(name
, 0, buffer_size
* sizeof(YCHAR
));
4419 yaffs_check_obj_details_loaded(obj
);
4420 if (obj
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4421 yaffs_strncpy(name
, YAFFS_LOSTNFOUND_NAME
, buffer_size
- 1);
4422 } else if (obj
->short_name
[0]) {
4423 yaffs_strcpy(name
, obj
->short_name
);
4424 } else if (obj
->hdr_chunk
> 0) {
4425 u8
*buffer
= yaffs_get_temp_buffer(obj
->my_dev
);
4427 struct yaffs_obj_hdr
*oh
= (struct yaffs_obj_hdr
*)buffer
;
4429 memset(buffer
, 0, obj
->my_dev
->data_bytes_per_chunk
);
4431 if (obj
->hdr_chunk
> 0) {
4432 yaffs_rd_chunk_tags_nand(obj
->my_dev
,
4436 yaffs_load_name_from_oh(obj
->my_dev
, name
, oh
->name
,
4439 yaffs_release_temp_buffer(obj
->my_dev
, buffer
);
4442 yaffs_fix_null_name(obj
, name
, buffer_size
);
4444 return yaffs_strnlen(name
, YAFFS_MAX_NAME_LENGTH
);
4447 loff_t
yaffs_get_obj_length(struct yaffs_obj
*obj
)
4449 /* Dereference any hard linking */
4450 obj
= yaffs_get_equivalent_obj(obj
);
4452 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_FILE
)
4453 return obj
->variant
.file_variant
.file_size
;
4454 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
4455 if (!obj
->variant
.symlink_variant
.alias
)
4457 return yaffs_strnlen(obj
->variant
.symlink_variant
.alias
,
4458 YAFFS_MAX_ALIAS_LENGTH
);
4460 /* Only a directory should drop through to here */
4461 return obj
->my_dev
->data_bytes_per_chunk
;
4465 int yaffs_get_obj_link_count(struct yaffs_obj
*obj
)
4468 struct list_head
*i
;
4471 count
++; /* the object itself */
4473 list_for_each(i
, &obj
->hard_links
)
4474 count
++; /* add the hard links; */
4479 int yaffs_get_obj_inode(struct yaffs_obj
*obj
)
4481 obj
= yaffs_get_equivalent_obj(obj
);
4486 unsigned yaffs_get_obj_type(struct yaffs_obj
*obj
)
4488 obj
= yaffs_get_equivalent_obj(obj
);
4490 switch (obj
->variant_type
) {
4491 case YAFFS_OBJECT_TYPE_FILE
:
4494 case YAFFS_OBJECT_TYPE_DIRECTORY
:
4497 case YAFFS_OBJECT_TYPE_SYMLINK
:
4500 case YAFFS_OBJECT_TYPE_HARDLINK
:
4503 case YAFFS_OBJECT_TYPE_SPECIAL
:
4504 if (S_ISFIFO(obj
->yst_mode
))
4506 if (S_ISCHR(obj
->yst_mode
))
4508 if (S_ISBLK(obj
->yst_mode
))
4510 if (S_ISSOCK(obj
->yst_mode
))
4520 YCHAR
*yaffs_get_symlink_alias(struct yaffs_obj
*obj
)
4522 obj
= yaffs_get_equivalent_obj(obj
);
4523 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
)
4524 return yaffs_clone_str(obj
->variant
.symlink_variant
.alias
);
4526 return yaffs_clone_str(_Y(""));
4529 /*--------------------------- Initialisation code -------------------------- */
4531 static int yaffs_check_dev_fns(const struct yaffs_dev
*dev
)
4533 /* Common functions, gotta have */
4534 if (!dev
->param
.erase_fn
|| !dev
->param
.initialise_flash_fn
)
4537 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
4538 if (dev
->param
.write_chunk_tags_fn
&&
4539 dev
->param
.read_chunk_tags_fn
&&
4540 !dev
->param
.write_chunk_fn
&&
4541 !dev
->param
.read_chunk_fn
&&
4542 dev
->param
.bad_block_fn
&& dev
->param
.query_block_fn
)
4545 /* Can use the "spare" style interface for yaffs1 */
4546 if (!dev
->param
.is_yaffs2
&&
4547 !dev
->param
.write_chunk_tags_fn
&&
4548 !dev
->param
.read_chunk_tags_fn
&&
4549 dev
->param
.write_chunk_fn
&&
4550 dev
->param
.read_chunk_fn
&&
4551 !dev
->param
.bad_block_fn
&& !dev
->param
.query_block_fn
)
4557 static int yaffs_create_initial_dir(struct yaffs_dev
*dev
)
4559 /* Initialise the unlinked, deleted, root and lost+found directories */
4560 dev
->lost_n_found
= dev
->root_dir
= NULL
;
4561 dev
->unlinked_dir
= dev
->del_dir
= NULL
;
4563 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_UNLINKED
, S_IFDIR
);
4565 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_DELETED
, S_IFDIR
);
4567 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_ROOT
,
4568 YAFFS_ROOT_MODE
| S_IFDIR
);
4570 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_LOSTNFOUND
,
4571 YAFFS_LOSTNFOUND_MODE
| S_IFDIR
);
4573 if (dev
->lost_n_found
&& dev
->root_dir
&& dev
->unlinked_dir
4575 yaffs_add_obj_to_dir(dev
->root_dir
, dev
->lost_n_found
);
4581 int yaffs_guts_initialise(struct yaffs_dev
*dev
)
4583 int init_failed
= 0;
4587 yaffs_trace(YAFFS_TRACE_TRACING
, "yaffs: yaffs_guts_initialise()");
4589 /* Check stuff that must be set */
4592 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4593 "yaffs: Need a device"
4598 if (dev
->is_mounted
) {
4599 yaffs_trace(YAFFS_TRACE_ALWAYS
, "device already mounted");
4603 dev
->internal_start_block
= dev
->param
.start_block
;
4604 dev
->internal_end_block
= dev
->param
.end_block
;
4605 dev
->block_offset
= 0;
4606 dev
->chunk_offset
= 0;
4607 dev
->n_free_chunks
= 0;
4611 if (dev
->param
.start_block
== 0) {
4612 dev
->internal_start_block
= dev
->param
.start_block
+ 1;
4613 dev
->internal_end_block
= dev
->param
.end_block
+ 1;
4614 dev
->block_offset
= 1;
4615 dev
->chunk_offset
= dev
->param
.chunks_per_block
;
4618 /* Check geometry parameters. */
4620 if ((!dev
->param
.inband_tags
&& dev
->param
.is_yaffs2
&&
4621 dev
->param
.total_bytes_per_chunk
< 1024) ||
4622 (!dev
->param
.is_yaffs2
&&
4623 dev
->param
.total_bytes_per_chunk
< 512) ||
4624 (dev
->param
.inband_tags
&& !dev
->param
.is_yaffs2
) ||
4625 dev
->param
.chunks_per_block
< 2 ||
4626 dev
->param
.n_reserved_blocks
< 2 ||
4627 dev
->internal_start_block
<= 0 ||
4628 dev
->internal_end_block
<= 0 ||
4629 dev
->internal_end_block
<=
4630 (dev
->internal_start_block
+ dev
->param
.n_reserved_blocks
+ 2)
4632 /* otherwise it is too small */
4633 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4634 "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4635 dev
->param
.total_bytes_per_chunk
,
4636 dev
->param
.is_yaffs2
? "2" : "",
4637 dev
->param
.inband_tags
);
4641 if (yaffs_init_nand(dev
) != YAFFS_OK
) {
4642 yaffs_trace(YAFFS_TRACE_ALWAYS
, "InitialiseNAND failed");
4646 /* Sort out space for inband tags, if required */
4647 if (dev
->param
.inband_tags
)
4648 dev
->data_bytes_per_chunk
=
4649 dev
->param
.total_bytes_per_chunk
-
4650 sizeof(struct yaffs_packed_tags2_tags_only
);
4652 dev
->data_bytes_per_chunk
= dev
->param
.total_bytes_per_chunk
;
4654 /* Got the right mix of functions? */
4655 if (!yaffs_check_dev_fns(dev
)) {
4656 /* Function missing */
4657 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4658 "device function(s) missing or wrong");
4663 /* Finished with most checks. Further checks happen later on too. */
4665 dev
->is_mounted
= 1;
4667 /* OK now calculate a few things for the device */
4670 * Calculate all the chunk size manipulation numbers:
4672 x
= dev
->data_bytes_per_chunk
;
4673 /* We always use dev->chunk_shift and dev->chunk_div */
4674 dev
->chunk_shift
= calc_shifts(x
);
4675 x
>>= dev
->chunk_shift
;
4677 /* We only use chunk mask if chunk_div is 1 */
4678 dev
->chunk_mask
= (1 << dev
->chunk_shift
) - 1;
4681 * Calculate chunk_grp_bits.
4682 * We need to find the next power of 2 > than internal_end_block
4685 x
= dev
->param
.chunks_per_block
* (dev
->internal_end_block
+ 1);
4687 bits
= calc_shifts_ceiling(x
);
4689 /* Set up tnode width if wide tnodes are enabled. */
4690 if (!dev
->param
.wide_tnodes_disabled
) {
4691 /* bits must be even so that we end up with 32-bit words */
4695 dev
->tnode_width
= 16;
4697 dev
->tnode_width
= bits
;
4699 dev
->tnode_width
= 16;
4702 dev
->tnode_mask
= (1 << dev
->tnode_width
) - 1;
4704 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4705 * so if the bitwidth of the
4706 * chunk range we're using is greater than 16 we need
4707 * to figure out chunk shift and chunk_grp_size
4710 if (bits
<= dev
->tnode_width
)
4711 dev
->chunk_grp_bits
= 0;
4713 dev
->chunk_grp_bits
= bits
- dev
->tnode_width
;
4715 dev
->tnode_size
= (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8;
4716 if (dev
->tnode_size
< sizeof(struct yaffs_tnode
))
4717 dev
->tnode_size
= sizeof(struct yaffs_tnode
);
4719 dev
->chunk_grp_size
= 1 << dev
->chunk_grp_bits
;
4721 if (dev
->param
.chunks_per_block
< dev
->chunk_grp_size
) {
4722 /* We have a problem because the soft delete won't work if
4723 * the chunk group size > chunks per block.
4724 * This can be remedied by using larger "virtual blocks".
4726 yaffs_trace(YAFFS_TRACE_ALWAYS
, "chunk group too large");
4731 /* Finished verifying the device, continue with initialisation */
4733 /* More device initialisation */
4735 dev
->passive_gc_count
= 0;
4736 dev
->oldest_dirty_gc_count
= 0;
4738 dev
->gc_block_finder
= 0;
4739 dev
->buffered_block
= -1;
4740 dev
->doing_buffered_block_rewrite
= 0;
4741 dev
->n_deleted_files
= 0;
4742 dev
->n_bg_deletions
= 0;
4743 dev
->n_unlinked_files
= 0;
4744 dev
->n_ecc_fixed
= 0;
4745 dev
->n_ecc_unfixed
= 0;
4746 dev
->n_tags_ecc_fixed
= 0;
4747 dev
->n_tags_ecc_unfixed
= 0;
4748 dev
->n_erase_failures
= 0;
4749 dev
->n_erased_blocks
= 0;
4750 dev
->gc_disable
= 0;
4751 dev
->has_pending_prioritised_gc
= 1;
4752 /* Assume the worst for now, will get fixed on first GC */
4753 INIT_LIST_HEAD(&dev
->dirty_dirs
);
4754 dev
->oldest_dirty_seq
= 0;
4755 dev
->oldest_dirty_block
= 0;
4757 /* Initialise temporary buffers and caches. */
4758 if (!yaffs_init_tmp_buffers(dev
))
4762 dev
->gc_cleanup_list
= NULL
;
4764 if (!init_failed
&& dev
->param
.n_caches
> 0) {
4768 dev
->param
.n_caches
* sizeof(struct yaffs_cache
);
4770 if (dev
->param
.n_caches
> YAFFS_MAX_SHORT_OP_CACHES
)
4771 dev
->param
.n_caches
= YAFFS_MAX_SHORT_OP_CACHES
;
4773 dev
->cache
= kmalloc(cache_bytes
, GFP_NOFS
);
4775 buf
= (u8
*) dev
->cache
;
4778 memset(dev
->cache
, 0, cache_bytes
);
4780 for (i
= 0; i
< dev
->param
.n_caches
&& buf
; i
++) {
4781 dev
->cache
[i
].object
= NULL
;
4782 dev
->cache
[i
].last_use
= 0;
4783 dev
->cache
[i
].dirty
= 0;
4784 dev
->cache
[i
].data
= buf
=
4785 kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
4790 dev
->cache_last_use
= 0;
4793 dev
->cache_hits
= 0;
4796 dev
->gc_cleanup_list
=
4797 kmalloc(dev
->param
.chunks_per_block
* sizeof(u32
),
4799 if (!dev
->gc_cleanup_list
)
4803 if (dev
->param
.is_yaffs2
)
4804 dev
->param
.use_header_file_size
= 1;
4806 if (!init_failed
&& !yaffs_init_blocks(dev
))
4809 yaffs_init_tnodes_and_objs(dev
);
4811 if (!init_failed
&& !yaffs_create_initial_dir(dev
))
4814 if (!init_failed
&& dev
->param
.is_yaffs2
&&
4815 !dev
->param
.disable_summary
&&
4816 !yaffs_summary_init(dev
))
4820 /* Now scan the flash. */
4821 if (dev
->param
.is_yaffs2
) {
4822 if (yaffs2_checkpt_restore(dev
)) {
4823 yaffs_check_obj_details_loaded(dev
->root_dir
);
4824 yaffs_trace(YAFFS_TRACE_CHECKPOINT
|
4826 "yaffs: restored from checkpoint"
4830 /* Clean up the mess caused by an aborted
4831 * checkpoint load then scan backwards.
4833 yaffs_deinit_blocks(dev
);
4835 yaffs_deinit_tnodes_and_objs(dev
);
4837 dev
->n_erased_blocks
= 0;
4838 dev
->n_free_chunks
= 0;
4839 dev
->alloc_block
= -1;
4840 dev
->alloc_page
= -1;
4841 dev
->n_deleted_files
= 0;
4842 dev
->n_unlinked_files
= 0;
4843 dev
->n_bg_deletions
= 0;
4845 if (!init_failed
&& !yaffs_init_blocks(dev
))
4848 yaffs_init_tnodes_and_objs(dev
);
4851 && !yaffs_create_initial_dir(dev
))
4854 if (!init_failed
&& !yaffs2_scan_backwards(dev
))
4857 } else if (!yaffs1_scan(dev
)) {
4861 yaffs_strip_deleted_objs(dev
);
4862 yaffs_fix_hanging_objs(dev
);
4863 if (dev
->param
.empty_lost_n_found
)
4864 yaffs_empty_l_n_f(dev
);
4868 /* Clean up the mess */
4869 yaffs_trace(YAFFS_TRACE_TRACING
,
4870 "yaffs: yaffs_guts_initialise() aborted.");
4872 yaffs_deinitialise(dev
);
4876 /* Zero out stats */
4877 dev
->n_page_reads
= 0;
4878 dev
->n_page_writes
= 0;
4879 dev
->n_erasures
= 0;
4880 dev
->n_gc_copies
= 0;
4881 dev
->n_retried_writes
= 0;
4883 dev
->n_retired_blocks
= 0;
4885 yaffs_verify_free_chunks(dev
);
4886 yaffs_verify_blocks(dev
);
4888 /* Clean up any aborted checkpoint data */
4889 if (!dev
->is_checkpointed
&& dev
->blocks_in_checkpt
> 0)
4890 yaffs2_checkpt_invalidate(dev
);
4892 yaffs_trace(YAFFS_TRACE_TRACING
,
4893 "yaffs: yaffs_guts_initialise() done.");
4897 void yaffs_deinitialise(struct yaffs_dev
*dev
)
4899 if (dev
->is_mounted
) {
4902 yaffs_deinit_blocks(dev
);
4903 yaffs_deinit_tnodes_and_objs(dev
);
4904 yaffs_summary_deinit(dev
);
4906 if (dev
->param
.n_caches
> 0 && dev
->cache
) {
4908 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
4909 kfree(dev
->cache
[i
].data
);
4910 dev
->cache
[i
].data
= NULL
;
4917 kfree(dev
->gc_cleanup_list
);
4919 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++)
4920 kfree(dev
->temp_buffer
[i
].buffer
);
4922 dev
->is_mounted
= 0;
4924 if (dev
->param
.deinitialise_flash_fn
)
4925 dev
->param
.deinitialise_flash_fn(dev
);
4929 int yaffs_count_free_chunks(struct yaffs_dev
*dev
)
4933 struct yaffs_block_info
*blk
;
4935 blk
= dev
->block_info
;
4936 for (b
= dev
->internal_start_block
; b
<= dev
->internal_end_block
; b
++) {
4937 switch (blk
->block_state
) {
4938 case YAFFS_BLOCK_STATE_EMPTY
:
4939 case YAFFS_BLOCK_STATE_ALLOCATING
:
4940 case YAFFS_BLOCK_STATE_COLLECTING
:
4941 case YAFFS_BLOCK_STATE_FULL
:
4943 (dev
->param
.chunks_per_block
- blk
->pages_in_use
+
4944 blk
->soft_del_pages
);
4954 int yaffs_get_n_free_chunks(struct yaffs_dev
*dev
)
4956 /* This is what we report to the outside world */
4959 int blocks_for_checkpt
;
4962 n_free
= dev
->n_free_chunks
;
4963 n_free
+= dev
->n_deleted_files
;
4965 /* Now count and subtract the number of dirty chunks in the cache. */
4967 for (n_dirty_caches
= 0, i
= 0; i
< dev
->param
.n_caches
; i
++) {
4968 if (dev
->cache
[i
].dirty
)
4972 n_free
-= n_dirty_caches
;
4975 ((dev
->param
.n_reserved_blocks
+ 1) * dev
->param
.chunks_per_block
);
4977 /* Now figure checkpoint space and report that... */
4978 blocks_for_checkpt
= yaffs_calc_checkpt_blocks_required(dev
);
4980 n_free
-= (blocks_for_checkpt
* dev
->param
.chunks_per_block
);
4989 * Marshalling functions to get loff_t file sizes into aand out of
4992 void yaffs_oh_size_load(struct yaffs_obj_hdr
*oh
, loff_t fsize
)
4994 oh
->file_size_low
= (fsize
& 0xFFFFFFFF);
4995 oh
->file_size_high
= ((fsize
>> 32) & 0xFFFFFFFF);
4998 loff_t
yaffs_oh_to_size(struct yaffs_obj_hdr
*oh
)
5002 if (~(oh
->file_size_high
))
5003 retval
= (((loff_t
) oh
->file_size_high
) << 32) |
5004 (((loff_t
) oh
->file_size_low
) & 0xFFFFFFFF);
5006 retval
= (loff_t
) oh
->file_size_low
;