2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 #include "yaffs_trace.h"
17 #include "yaffs_guts.h"
18 #include "yaffs_getblockinfo.h"
19 #include "yaffs_tagscompat.h"
20 #include "yaffs_tagsmarshall.h"
21 #include "yaffs_nand.h"
22 #include "yaffs_yaffs1.h"
23 #include "yaffs_yaffs2.h"
24 #include "yaffs_bitmap.h"
25 #include "yaffs_verify.h"
26 #include "yaffs_nand.h"
27 #include "yaffs_packedtags2.h"
28 #include "yaffs_nameval.h"
29 #include "yaffs_allocator.h"
30 #include "yaffs_attribs.h"
31 #include "yaffs_summary.h"
33 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
34 #define YAFFS_GC_GOOD_ENOUGH 2
35 #define YAFFS_GC_PASSIVE_THRESHOLD 4
37 #include "yaffs_ecc.h"
39 /* Forward declarations */
41 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
42 const u8
*buffer
, int n_bytes
, int use_reserve
);
44 static void yaffs_fix_null_name(struct yaffs_obj
*obj
, YCHAR
*name
,
47 /* Function to calculate chunk and offset */
49 void yaffs_addr_to_chunk(struct yaffs_dev
*dev
, loff_t addr
,
50 int *chunk_out
, u32
*offset_out
)
55 chunk
= (u32
) (addr
>> dev
->chunk_shift
);
57 if (dev
->chunk_div
== 1) {
58 /* easy power of 2 case */
59 offset
= (u32
) (addr
& dev
->chunk_mask
);
61 /* Non power-of-2 case */
65 chunk
/= dev
->chunk_div
;
67 chunk_base
= ((loff_t
) chunk
) * dev
->data_bytes_per_chunk
;
68 offset
= (u32
) (addr
- chunk_base
);
75 /* Function to return the number of shifts for a power of 2 greater than or
76 * equal to the given number
77 * Note we don't try to cater for all possible numbers and this does not have to
78 * be hellishly efficient.
81 static inline u32
calc_shifts_ceiling(u32 x
)
86 shifts
= extra_bits
= 0;
101 /* Function to return the number of shifts to get a 1 in bit 0
104 static inline u32
calc_shifts(u32 x
)
122 * Temporary buffer manipulations.
125 static int yaffs_init_tmp_buffers(struct yaffs_dev
*dev
)
130 memset(dev
->temp_buffer
, 0, sizeof(dev
->temp_buffer
));
132 for (i
= 0; buf
&& i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
133 dev
->temp_buffer
[i
].in_use
= 0;
134 buf
= kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
135 dev
->temp_buffer
[i
].buffer
= buf
;
138 return buf
? YAFFS_OK
: YAFFS_FAIL
;
141 u8
*yaffs_get_temp_buffer(struct yaffs_dev
* dev
)
146 if (dev
->temp_in_use
> dev
->max_temp
)
147 dev
->max_temp
= dev
->temp_in_use
;
149 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
150 if (dev
->temp_buffer
[i
].in_use
== 0) {
151 dev
->temp_buffer
[i
].in_use
= 1;
152 return dev
->temp_buffer
[i
].buffer
;
156 yaffs_trace(YAFFS_TRACE_BUFFERS
, "Out of temp buffers");
158 * If we got here then we have to allocate an unmanaged one
162 dev
->unmanaged_buffer_allocs
++;
163 return kmalloc(dev
->data_bytes_per_chunk
, GFP_NOFS
);
167 void yaffs_release_temp_buffer(struct yaffs_dev
*dev
, u8
*buffer
)
173 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
174 if (dev
->temp_buffer
[i
].buffer
== buffer
) {
175 dev
->temp_buffer
[i
].in_use
= 0;
181 /* assume it is an unmanaged one. */
182 yaffs_trace(YAFFS_TRACE_BUFFERS
,
183 "Releasing unmanaged temp buffer");
185 dev
->unmanaged_buffer_deallocs
++;
191 * Functions for robustisizing TODO
195 static void yaffs_handle_chunk_wr_ok(struct yaffs_dev
*dev
, int nand_chunk
,
197 const struct yaffs_ext_tags
*tags
)
205 static void yaffs_handle_chunk_update(struct yaffs_dev
*dev
, int nand_chunk
,
206 const struct yaffs_ext_tags
*tags
)
213 void yaffs_handle_chunk_error(struct yaffs_dev
*dev
,
214 struct yaffs_block_info
*bi
)
216 if (!bi
->gc_prioritise
) {
217 bi
->gc_prioritise
= 1;
218 dev
->has_pending_prioritised_gc
= 1;
219 bi
->chunk_error_strikes
++;
221 if (bi
->chunk_error_strikes
> 3) {
222 bi
->needs_retiring
= 1; /* Too many stikes, so retire */
223 yaffs_trace(YAFFS_TRACE_ALWAYS
,
224 "yaffs: Block struck out");
230 static void yaffs_handle_chunk_wr_error(struct yaffs_dev
*dev
, int nand_chunk
,
233 int flash_block
= nand_chunk
/ dev
->param
.chunks_per_block
;
234 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
236 yaffs_handle_chunk_error(dev
, bi
);
239 /* Was an actual write failure,
240 * so mark the block for retirement.*/
241 bi
->needs_retiring
= 1;
242 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
243 "**>> Block %d needs retiring", flash_block
);
246 /* Delete the chunk */
247 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
248 yaffs_skip_rest_of_block(dev
);
256 * Simple hash function. Needs to have a reasonable spread
259 static inline int yaffs_hash_fn(int n
)
263 return n
% YAFFS_NOBJECT_BUCKETS
;
267 * Access functions to useful fake objects.
268 * Note that root might have a presence in NAND if permissions are set.
271 struct yaffs_obj
*yaffs_root(struct yaffs_dev
*dev
)
273 return dev
->root_dir
;
276 struct yaffs_obj
*yaffs_lost_n_found(struct yaffs_dev
*dev
)
278 return dev
->lost_n_found
;
282 * Erased NAND checking functions
285 int yaffs_check_ff(u8
*buffer
, int n_bytes
)
287 /* Horrible, slow implementation */
296 static int yaffs_check_chunk_erased(struct yaffs_dev
*dev
, int nand_chunk
)
298 int retval
= YAFFS_OK
;
299 u8
*data
= yaffs_get_temp_buffer(dev
);
300 struct yaffs_ext_tags tags
;
303 result
= yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, data
, &tags
);
305 if (tags
.ecc_result
> YAFFS_ECC_RESULT_NO_ERROR
)
308 if (!yaffs_check_ff(data
, dev
->data_bytes_per_chunk
) ||
310 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
311 "Chunk %d not erased", nand_chunk
);
315 yaffs_release_temp_buffer(dev
, data
);
321 static int yaffs_verify_chunk_written(struct yaffs_dev
*dev
,
324 struct yaffs_ext_tags
*tags
)
326 int retval
= YAFFS_OK
;
327 struct yaffs_ext_tags temp_tags
;
328 u8
*buffer
= yaffs_get_temp_buffer(dev
);
331 result
= yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, buffer
, &temp_tags
);
332 if (memcmp(buffer
, data
, dev
->data_bytes_per_chunk
) ||
333 temp_tags
.obj_id
!= tags
->obj_id
||
334 temp_tags
.chunk_id
!= tags
->chunk_id
||
335 temp_tags
.n_bytes
!= tags
->n_bytes
)
338 yaffs_release_temp_buffer(dev
, buffer
);
344 int yaffs_check_alloc_available(struct yaffs_dev
*dev
, int n_chunks
)
347 int reserved_blocks
= dev
->param
.n_reserved_blocks
;
350 checkpt_blocks
= yaffs_calc_checkpt_blocks_required(dev
);
353 (reserved_blocks
+ checkpt_blocks
) * dev
->param
.chunks_per_block
;
355 return (dev
->n_free_chunks
> (reserved_chunks
+ n_chunks
));
358 static int yaffs_find_alloc_block(struct yaffs_dev
*dev
)
361 struct yaffs_block_info
*bi
;
363 if (dev
->n_erased_blocks
< 1) {
364 /* Hoosterman we've got a problem.
365 * Can't get space to gc
367 yaffs_trace(YAFFS_TRACE_ERROR
,
368 "yaffs tragedy: no more erased blocks");
373 /* Find an empty block. */
375 for (i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
376 dev
->alloc_block_finder
++;
377 if (dev
->alloc_block_finder
< dev
->internal_start_block
378 || dev
->alloc_block_finder
> dev
->internal_end_block
) {
379 dev
->alloc_block_finder
= dev
->internal_start_block
;
382 bi
= yaffs_get_block_info(dev
, dev
->alloc_block_finder
);
384 if (bi
->block_state
== YAFFS_BLOCK_STATE_EMPTY
) {
385 bi
->block_state
= YAFFS_BLOCK_STATE_ALLOCATING
;
387 bi
->seq_number
= dev
->seq_number
;
388 dev
->n_erased_blocks
--;
389 yaffs_trace(YAFFS_TRACE_ALLOCATE
,
390 "Allocated block %d, seq %d, %d left" ,
391 dev
->alloc_block_finder
, dev
->seq_number
,
392 dev
->n_erased_blocks
);
393 return dev
->alloc_block_finder
;
397 yaffs_trace(YAFFS_TRACE_ALWAYS
,
398 "yaffs tragedy: no more erased blocks, but there should have been %d",
399 dev
->n_erased_blocks
);
404 static int yaffs_alloc_chunk(struct yaffs_dev
*dev
, int use_reserver
,
405 struct yaffs_block_info
**block_ptr
)
408 struct yaffs_block_info
*bi
;
410 if (dev
->alloc_block
< 0) {
411 /* Get next block to allocate off */
412 dev
->alloc_block
= yaffs_find_alloc_block(dev
);
416 if (!use_reserver
&& !yaffs_check_alloc_available(dev
, 1)) {
417 /* No space unless we're allowed to use the reserve. */
421 if (dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
422 && dev
->alloc_page
== 0)
423 yaffs_trace(YAFFS_TRACE_ALLOCATE
, "Allocating reserve");
425 /* Next page please.... */
426 if (dev
->alloc_block
>= 0) {
427 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
429 ret_val
= (dev
->alloc_block
* dev
->param
.chunks_per_block
) +
432 yaffs_set_chunk_bit(dev
, dev
->alloc_block
, dev
->alloc_page
);
436 dev
->n_free_chunks
--;
438 /* If the block is full set the state to full */
439 if (dev
->alloc_page
>= dev
->param
.chunks_per_block
) {
440 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
441 dev
->alloc_block
= -1;
450 yaffs_trace(YAFFS_TRACE_ERROR
,
451 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
456 static int yaffs_get_erased_chunks(struct yaffs_dev
*dev
)
460 n
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
462 if (dev
->alloc_block
> 0)
463 n
+= (dev
->param
.chunks_per_block
- dev
->alloc_page
);
470 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
471 * if we don't want to write to it.
473 void yaffs_skip_rest_of_block(struct yaffs_dev
*dev
)
475 struct yaffs_block_info
*bi
;
477 if (dev
->alloc_block
> 0) {
478 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
479 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
) {
480 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
481 dev
->alloc_block
= -1;
486 static int yaffs_write_new_chunk(struct yaffs_dev
*dev
,
488 struct yaffs_ext_tags
*tags
, int use_reserver
)
494 yaffs2_checkpt_invalidate(dev
);
497 struct yaffs_block_info
*bi
= 0;
500 chunk
= yaffs_alloc_chunk(dev
, use_reserver
, &bi
);
506 /* First check this chunk is erased, if it needs
507 * checking. The checking policy (unless forced
508 * always on) is as follows:
510 * Check the first page we try to write in a block.
511 * If the check passes then we don't need to check any
512 * more. If the check fails, we check again...
513 * If the block has been erased, we don't need to check.
515 * However, if the block has been prioritised for gc,
516 * then we think there might be something odd about
517 * this block and stop using it.
519 * Rationale: We should only ever see chunks that have
520 * not been erased if there was a partially written
521 * chunk due to power loss. This checking policy should
522 * catch that case with very few checks and thus save a
523 * lot of checks that are most likely not needed.
526 * If an erase check fails or the write fails we skip the
530 /* let's give it a try */
533 if (dev
->param
.always_check_erased
)
534 bi
->skip_erased_check
= 0;
536 if (!bi
->skip_erased_check
) {
537 erased_ok
= yaffs_check_chunk_erased(dev
, chunk
);
538 if (erased_ok
!= YAFFS_OK
) {
539 yaffs_trace(YAFFS_TRACE_ERROR
,
540 "**>> yaffs chunk %d was not erased",
543 /* If not erased, delete this one,
544 * skip rest of block and
545 * try another chunk */
546 yaffs_chunk_del(dev
, chunk
, 1, __LINE__
);
547 yaffs_skip_rest_of_block(dev
);
552 write_ok
= yaffs_wr_chunk_tags_nand(dev
, chunk
, data
, tags
);
554 if (!bi
->skip_erased_check
)
556 yaffs_verify_chunk_written(dev
, chunk
, data
, tags
);
558 if (write_ok
!= YAFFS_OK
) {
559 /* Clean up aborted write, skip to next block and
560 * try another chunk */
561 yaffs_handle_chunk_wr_error(dev
, chunk
, erased_ok
);
565 bi
->skip_erased_check
= 1;
567 /* Copy the data into the robustification buffer */
568 yaffs_handle_chunk_wr_ok(dev
, chunk
, data
, tags
);
570 } while (write_ok
!= YAFFS_OK
&&
571 (yaffs_wr_attempts
<= 0 || attempts
<= yaffs_wr_attempts
));
577 yaffs_trace(YAFFS_TRACE_ERROR
,
578 "**>> yaffs write required %d attempts",
580 dev
->n_retried_writes
+= (attempts
- 1);
587 * Block retiring for handling a broken block.
590 static void yaffs_retire_block(struct yaffs_dev
*dev
, int flash_block
)
592 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
594 yaffs2_checkpt_invalidate(dev
);
596 yaffs2_clear_oldest_dirty_seq(dev
, bi
);
598 if (yaffs_mark_bad(dev
, flash_block
) != YAFFS_OK
) {
599 if (yaffs_erase_block(dev
, flash_block
) != YAFFS_OK
) {
600 yaffs_trace(YAFFS_TRACE_ALWAYS
,
601 "yaffs: Failed to mark bad and erase block %d",
604 struct yaffs_ext_tags tags
;
606 flash_block
* dev
->param
.chunks_per_block
;
608 u8
*buffer
= yaffs_get_temp_buffer(dev
);
610 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
611 memset(&tags
, 0, sizeof(tags
));
612 tags
.seq_number
= YAFFS_SEQUENCE_BAD_BLOCK
;
613 if (dev
->tagger
.write_chunk_tags_fn(dev
, chunk_id
-
617 yaffs_trace(YAFFS_TRACE_ALWAYS
,
618 "yaffs: Failed to write bad block marker to block %d",
621 yaffs_release_temp_buffer(dev
, buffer
);
625 bi
->block_state
= YAFFS_BLOCK_STATE_DEAD
;
626 bi
->gc_prioritise
= 0;
627 bi
->needs_retiring
= 0;
629 dev
->n_retired_blocks
++;
632 /*---------------- Name handling functions ------------*/
634 static u16
yaffs_calc_name_sum(const YCHAR
*name
)
642 while ((*name
) && i
< (YAFFS_MAX_NAME_LENGTH
/ 2)) {
644 /* 0x1f mask is case insensitive */
645 sum
+= ((*name
) & 0x1f) * i
;
653 void yaffs_set_obj_name(struct yaffs_obj
*obj
, const YCHAR
* name
)
655 memset(obj
->short_name
, 0, sizeof(obj
->short_name
));
657 if (name
&& !name
[0]) {
658 yaffs_fix_null_name(obj
, obj
->short_name
,
659 YAFFS_SHORT_NAME_LENGTH
);
660 name
= obj
->short_name
;
662 strnlen(name
, YAFFS_SHORT_NAME_LENGTH
+ 1) <=
663 YAFFS_SHORT_NAME_LENGTH
) {
664 strcpy(obj
->short_name
, name
);
667 obj
->sum
= yaffs_calc_name_sum(name
);
670 void yaffs_set_obj_name_from_oh(struct yaffs_obj
*obj
,
671 const struct yaffs_obj_hdr
*oh
)
673 #ifdef CONFIG_YAFFS_AUTO_UNICODE
674 YCHAR tmp_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
675 memset(tmp_name
, 0, sizeof(tmp_name
));
676 yaffs_load_name_from_oh(obj
->my_dev
, tmp_name
, oh
->name
,
677 YAFFS_MAX_NAME_LENGTH
+ 1);
678 yaffs_set_obj_name(obj
, tmp_name
);
680 yaffs_set_obj_name(obj
, oh
->name
);
684 loff_t
yaffs_max_file_size(struct yaffs_dev
*dev
)
686 if(sizeof(loff_t
) < 8)
687 return YAFFS_MAX_FILE_SIZE_32
;
689 return ((loff_t
) YAFFS_MAX_CHUNK_ID
) * dev
->data_bytes_per_chunk
;
692 /*-------------------- TNODES -------------------
694 * List of spare tnodes
695 * The list is hooked together using the first pointer
699 struct yaffs_tnode
*yaffs_get_tnode(struct yaffs_dev
*dev
)
701 struct yaffs_tnode
*tn
= yaffs_alloc_raw_tnode(dev
);
704 memset(tn
, 0, dev
->tnode_size
);
708 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
713 /* FreeTnode frees up a tnode and puts it back on the free list */
714 static void yaffs_free_tnode(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
)
716 yaffs_free_raw_tnode(dev
, tn
);
718 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
721 static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev
*dev
)
723 yaffs_deinit_raw_tnodes_and_objs(dev
);
728 static void yaffs_load_tnode_0(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
729 unsigned pos
, unsigned val
)
731 u32
*map
= (u32
*) tn
;
737 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
738 val
>>= dev
->chunk_grp_bits
;
740 bit_in_map
= pos
* dev
->tnode_width
;
741 word_in_map
= bit_in_map
/ 32;
742 bit_in_word
= bit_in_map
& (32 - 1);
744 mask
= dev
->tnode_mask
<< bit_in_word
;
746 map
[word_in_map
] &= ~mask
;
747 map
[word_in_map
] |= (mask
& (val
<< bit_in_word
));
749 if (dev
->tnode_width
> (32 - bit_in_word
)) {
750 bit_in_word
= (32 - bit_in_word
);
753 dev
->tnode_mask
>> bit_in_word
;
754 map
[word_in_map
] &= ~mask
;
755 map
[word_in_map
] |= (mask
& (val
>> bit_in_word
));
759 u32
yaffs_get_group_base(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
762 u32
*map
= (u32
*) tn
;
768 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
770 bit_in_map
= pos
* dev
->tnode_width
;
771 word_in_map
= bit_in_map
/ 32;
772 bit_in_word
= bit_in_map
& (32 - 1);
774 val
= map
[word_in_map
] >> bit_in_word
;
776 if (dev
->tnode_width
> (32 - bit_in_word
)) {
777 bit_in_word
= (32 - bit_in_word
);
779 val
|= (map
[word_in_map
] << bit_in_word
);
782 val
&= dev
->tnode_mask
;
783 val
<<= dev
->chunk_grp_bits
;
788 /* ------------------- End of individual tnode manipulation -----------------*/
790 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
791 * The look up tree is represented by the top tnode and the number of top_level
792 * in the tree. 0 means only the level 0 tnode is in the tree.
795 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
796 struct yaffs_tnode
*yaffs_find_tnode_0(struct yaffs_dev
*dev
,
797 struct yaffs_file_var
*file_struct
,
800 struct yaffs_tnode
*tn
= file_struct
->top
;
803 int level
= file_struct
->top_level
;
807 /* Check sane level and chunk Id */
808 if (level
< 0 || level
> YAFFS_TNODES_MAX_LEVEL
)
811 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
814 /* First check we're tall enough (ie enough top_level) */
816 i
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
819 i
>>= YAFFS_TNODES_INTERNAL_BITS
;
823 if (required_depth
> file_struct
->top_level
)
824 return NULL
; /* Not tall enough, so we can't find it */
826 /* Traverse down to level 0 */
827 while (level
> 0 && tn
) {
828 tn
= tn
->internal
[(chunk_id
>>
829 (YAFFS_TNODES_LEVEL0_BITS
+
831 YAFFS_TNODES_INTERNAL_BITS
)) &
832 YAFFS_TNODES_INTERNAL_MASK
];
839 /* add_find_tnode_0 finds the level 0 tnode if it exists,
840 * otherwise first expands the tree.
841 * This happens in two steps:
842 * 1. If the tree isn't tall enough, then make it taller.
843 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
845 * Used when modifying the tree.
847 * If the tn argument is NULL, then a fresh tnode will be added otherwise the
848 * specified tn will be plugged into the ttree.
851 struct yaffs_tnode
*yaffs_add_find_tnode_0(struct yaffs_dev
*dev
,
852 struct yaffs_file_var
*file_struct
,
854 struct yaffs_tnode
*passed_tn
)
859 struct yaffs_tnode
*tn
;
862 /* Check sane level and page Id */
863 if (file_struct
->top_level
< 0 ||
864 file_struct
->top_level
> YAFFS_TNODES_MAX_LEVEL
)
867 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
870 /* First check we're tall enough (ie enough top_level) */
872 x
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
875 x
>>= YAFFS_TNODES_INTERNAL_BITS
;
879 if (required_depth
> file_struct
->top_level
) {
880 /* Not tall enough, gotta make the tree taller */
881 for (i
= file_struct
->top_level
; i
< required_depth
; i
++) {
883 tn
= yaffs_get_tnode(dev
);
886 tn
->internal
[0] = file_struct
->top
;
887 file_struct
->top
= tn
;
888 file_struct
->top_level
++;
890 yaffs_trace(YAFFS_TRACE_ERROR
,
891 "yaffs: no more tnodes");
897 /* Traverse down to level 0, adding anything we need */
899 l
= file_struct
->top_level
;
900 tn
= file_struct
->top
;
903 while (l
> 0 && tn
) {
905 (YAFFS_TNODES_LEVEL0_BITS
+
906 (l
- 1) * YAFFS_TNODES_INTERNAL_BITS
)) &
907 YAFFS_TNODES_INTERNAL_MASK
;
909 if ((l
> 1) && !tn
->internal
[x
]) {
910 /* Add missing non-level-zero tnode */
911 tn
->internal
[x
] = yaffs_get_tnode(dev
);
912 if (!tn
->internal
[x
])
915 /* Looking from level 1 at level 0 */
917 /* If we already have one, release it */
919 yaffs_free_tnode(dev
,
921 tn
->internal
[x
] = passed_tn
;
923 } else if (!tn
->internal
[x
]) {
924 /* Don't have one, none passed in */
925 tn
->internal
[x
] = yaffs_get_tnode(dev
);
926 if (!tn
->internal
[x
])
931 tn
= tn
->internal
[x
];
937 memcpy(tn
, passed_tn
,
938 (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8);
939 yaffs_free_tnode(dev
, passed_tn
);
946 static int yaffs_tags_match(const struct yaffs_ext_tags
*tags
, int obj_id
,
949 return (tags
->chunk_id
== chunk_obj
&&
950 tags
->obj_id
== obj_id
&&
951 !tags
->is_deleted
) ? 1 : 0;
955 static int yaffs_find_chunk_in_group(struct yaffs_dev
*dev
, int the_chunk
,
956 struct yaffs_ext_tags
*tags
, int obj_id
,
961 for (j
= 0; the_chunk
&& j
< dev
->chunk_grp_size
; j
++) {
962 if (yaffs_check_chunk_bit
963 (dev
, the_chunk
/ dev
->param
.chunks_per_block
,
964 the_chunk
% dev
->param
.chunks_per_block
)) {
966 if (dev
->chunk_grp_size
== 1)
969 yaffs_rd_chunk_tags_nand(dev
, the_chunk
, NULL
,
971 if (yaffs_tags_match(tags
,
972 obj_id
, inode_chunk
)) {
983 int yaffs_find_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
984 struct yaffs_ext_tags
*tags
)
986 /*Get the Tnode, then get the level 0 offset chunk offset */
987 struct yaffs_tnode
*tn
;
989 struct yaffs_ext_tags local_tags
;
991 struct yaffs_dev
*dev
= in
->my_dev
;
994 /* Passed a NULL, so use our own tags space */
998 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1003 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1005 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1010 static int yaffs_find_del_file_chunk(struct yaffs_obj
*in
, int inode_chunk
,
1011 struct yaffs_ext_tags
*tags
)
1013 /* Get the Tnode, then get the level 0 offset chunk offset */
1014 struct yaffs_tnode
*tn
;
1016 struct yaffs_ext_tags local_tags
;
1017 struct yaffs_dev
*dev
= in
->my_dev
;
1021 /* Passed a NULL, so use our own tags space */
1025 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1030 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1032 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1035 /* Delete the entry in the filestructure (if found) */
1037 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, 0);
1042 int yaffs_put_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
1043 int nand_chunk
, int in_scan
)
1045 /* NB in_scan is zero unless scanning.
1046 * For forward scanning, in_scan is > 0;
1047 * for backward scanning in_scan is < 0
1049 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1052 struct yaffs_tnode
*tn
;
1053 struct yaffs_dev
*dev
= in
->my_dev
;
1055 struct yaffs_ext_tags existing_tags
;
1056 struct yaffs_ext_tags new_tags
;
1057 unsigned existing_serial
, new_serial
;
1059 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
) {
1060 /* Just ignore an attempt at putting a chunk into a non-file
1062 * If it is not during Scanning then something went wrong!
1065 yaffs_trace(YAFFS_TRACE_ERROR
,
1066 "yaffs tragedy:attempt to put data chunk into a non-file"
1071 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1075 tn
= yaffs_add_find_tnode_0(dev
,
1076 &in
->variant
.file_variant
,
1082 /* Dummy insert, bail now */
1085 existing_cunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1088 /* If we're scanning then we need to test for duplicates
1089 * NB This does not need to be efficient since it should only
1090 * happen when the power fails during a write, then only one
1091 * chunk should ever be affected.
1093 * Correction for YAFFS2: This could happen quite a lot and we
1094 * need to think about efficiency! TODO
1095 * Update: For backward scanning we don't need to re-read tags
1096 * so this is quite cheap.
1099 if (existing_cunk
> 0) {
1100 /* NB Right now existing chunk will not be real
1101 * chunk_id if the chunk group size > 1
1102 * thus we have to do a FindChunkInFile to get the
1105 * We have a duplicate now we need to decide which
1108 * Backwards scanning YAFFS2: The old one is what
1109 * we use, dump the new one.
1110 * YAFFS1: Get both sets of tags and compare serial
1115 /* Only do this for forward scanning */
1116 yaffs_rd_chunk_tags_nand(dev
,
1120 /* Do a proper find */
1122 yaffs_find_chunk_in_file(in
, inode_chunk
,
1126 if (existing_cunk
<= 0) {
1127 /*Hoosterman - how did this happen? */
1129 yaffs_trace(YAFFS_TRACE_ERROR
,
1130 "yaffs tragedy: existing chunk < 0 in scan"
1135 /* NB The deleted flags should be false, otherwise
1136 * the chunks will not be loaded during a scan
1140 new_serial
= new_tags
.serial_number
;
1141 existing_serial
= existing_tags
.serial_number
;
1144 if ((in_scan
> 0) &&
1145 (existing_cunk
<= 0 ||
1146 ((existing_serial
+ 1) & 3) == new_serial
)) {
1147 /* Forward scanning.
1149 * Delete the old one and drop through to
1152 yaffs_chunk_del(dev
, existing_cunk
, 1,
1155 /* Backward scanning or we want to use the
1157 * Delete the new one and return early so that
1158 * the tnode isn't changed
1160 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1167 if (existing_cunk
== 0)
1168 in
->n_data_chunks
++;
1170 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, nand_chunk
);
1175 static void yaffs_soft_del_chunk(struct yaffs_dev
*dev
, int chunk
)
1177 struct yaffs_block_info
*the_block
;
1180 yaffs_trace(YAFFS_TRACE_DELETION
, "soft delete chunk %d", chunk
);
1182 block_no
= chunk
/ dev
->param
.chunks_per_block
;
1183 the_block
= yaffs_get_block_info(dev
, block_no
);
1185 the_block
->soft_del_pages
++;
1186 dev
->n_free_chunks
++;
1187 yaffs2_update_oldest_dirty_seq(dev
, block_no
, the_block
);
1191 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1192 * the chunks in the file.
1193 * All soft deleting does is increment the block's softdelete count and pulls
1194 * the chunk out of the tnode.
1195 * Thus, essentially this is the same as DeleteWorker except that the chunks
1199 static int yaffs_soft_del_worker(struct yaffs_obj
*in
, struct yaffs_tnode
*tn
,
1200 u32 level
, int chunk_offset
)
1205 struct yaffs_dev
*dev
= in
->my_dev
;
1211 for (i
= YAFFS_NTNODES_INTERNAL
- 1;
1214 if (tn
->internal
[i
]) {
1216 yaffs_soft_del_worker(in
,
1220 YAFFS_TNODES_INTERNAL_BITS
)
1223 yaffs_free_tnode(dev
,
1225 tn
->internal
[i
] = NULL
;
1227 /* Can this happen? */
1231 return (all_done
) ? 1 : 0;
1235 for (i
= YAFFS_NTNODES_LEVEL0
- 1; i
>= 0; i
--) {
1236 the_chunk
= yaffs_get_group_base(dev
, tn
, i
);
1238 yaffs_soft_del_chunk(dev
, the_chunk
);
1239 yaffs_load_tnode_0(dev
, tn
, i
, 0);
1245 static void yaffs_remove_obj_from_dir(struct yaffs_obj
*obj
)
1247 struct yaffs_dev
*dev
= obj
->my_dev
;
1248 struct yaffs_obj
*parent
;
1250 yaffs_verify_obj_in_dir(obj
);
1251 parent
= obj
->parent
;
1253 yaffs_verify_dir(parent
);
1255 if (dev
&& dev
->param
.remove_obj_fn
)
1256 dev
->param
.remove_obj_fn(obj
);
1258 list_del_init(&obj
->siblings
);
1261 yaffs_verify_dir(parent
);
1264 void yaffs_add_obj_to_dir(struct yaffs_obj
*directory
, struct yaffs_obj
*obj
)
1267 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1268 "tragedy: Trying to add an object to a null pointer directory"
1273 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1274 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1275 "tragedy: Trying to add an object to a non-directory"
1280 if (obj
->siblings
.prev
== NULL
) {
1281 /* Not initialised */
1285 yaffs_verify_dir(directory
);
1287 yaffs_remove_obj_from_dir(obj
);
1290 list_add(&obj
->siblings
, &directory
->variant
.dir_variant
.children
);
1291 obj
->parent
= directory
;
1293 if (directory
== obj
->my_dev
->unlinked_dir
1294 || directory
== obj
->my_dev
->del_dir
) {
1296 obj
->my_dev
->n_unlinked_files
++;
1297 obj
->rename_allowed
= 0;
1300 yaffs_verify_dir(directory
);
1301 yaffs_verify_obj_in_dir(obj
);
1304 static int yaffs_change_obj_name(struct yaffs_obj
*obj
,
1305 struct yaffs_obj
*new_dir
,
1306 const YCHAR
*new_name
, int force
, int shadows
)
1310 struct yaffs_obj
*existing_target
;
1312 if (new_dir
== NULL
)
1313 new_dir
= obj
->parent
; /* use the old directory */
1315 if (new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1316 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1317 "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1322 unlink_op
= (new_dir
== obj
->my_dev
->unlinked_dir
);
1323 del_op
= (new_dir
== obj
->my_dev
->del_dir
);
1325 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
1327 /* If the object is a file going into the unlinked directory,
1328 * then it is OK to just stuff it in since duplicate names are OK.
1329 * else only proceed if the new name does not exist and we're putting
1330 * it into a directory.
1332 if (!(unlink_op
|| del_op
|| force
||
1333 shadows
> 0 || !existing_target
) ||
1334 new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
1337 yaffs_set_obj_name(obj
, new_name
);
1339 yaffs_add_obj_to_dir(new_dir
, obj
);
1344 /* If it is a deletion then we mark it as a shrink for gc */
1345 if (yaffs_update_oh(obj
, new_name
, 0, del_op
, shadows
, NULL
) >= 0)
1351 /*------------------------ Short Operations Cache ------------------------------
1352 * In many situations where there is no high level buffering a lot of
1353 * reads might be short sequential reads, and a lot of writes may be short
1354 * sequential writes. eg. scanning/writing a jpeg file.
1355 * In these cases, a short read/write cache can provide a huge perfomance
1356 * benefit with dumb-as-a-rock code.
1357 * In Linux, the page cache provides read buffering and the short op cache
1358 * provides write buffering.
1360 * There are a small number (~10) of cache chunks per device so that we don't
1361 * need a very intelligent search.
1364 static int yaffs_obj_cache_dirty(struct yaffs_obj
*obj
)
1366 struct yaffs_dev
*dev
= obj
->my_dev
;
1368 struct yaffs_cache
*cache
;
1369 int n_caches
= obj
->my_dev
->param
.n_caches
;
1371 for (i
= 0; i
< n_caches
; i
++) {
1372 cache
= &dev
->cache
[i
];
1373 if (cache
->object
== obj
&& cache
->dirty
)
1380 static void yaffs_flush_file_cache(struct yaffs_obj
*obj
)
1382 struct yaffs_dev
*dev
= obj
->my_dev
;
1383 int lowest
= -99; /* Stop compiler whining. */
1385 struct yaffs_cache
*cache
;
1386 int chunk_written
= 0;
1387 int n_caches
= obj
->my_dev
->param
.n_caches
;
1394 /* Find the lowest dirty chunk for this object */
1395 for (i
= 0; i
< n_caches
; i
++) {
1396 if (dev
->cache
[i
].object
== obj
&&
1397 dev
->cache
[i
].dirty
) {
1399 dev
->cache
[i
].chunk_id
< lowest
) {
1400 cache
= &dev
->cache
[i
];
1401 lowest
= cache
->chunk_id
;
1406 if (cache
&& !cache
->locked
) {
1407 /* Write it out and free it up */
1409 yaffs_wr_data_obj(cache
->object
,
1414 cache
->object
= NULL
;
1416 } while (cache
&& chunk_written
> 0);
1419 /* Hoosterman, disk full while writing cache out. */
1420 yaffs_trace(YAFFS_TRACE_ERROR
,
1421 "yaffs tragedy: no space during cache write");
1424 /*yaffs_flush_whole_cache(dev)
1429 void yaffs_flush_whole_cache(struct yaffs_dev
*dev
)
1431 struct yaffs_obj
*obj
;
1432 int n_caches
= dev
->param
.n_caches
;
1435 /* Find a dirty object in the cache and flush it...
1436 * until there are no further dirty objects.
1440 for (i
= 0; i
< n_caches
&& !obj
; i
++) {
1441 if (dev
->cache
[i
].object
&& dev
->cache
[i
].dirty
)
1442 obj
= dev
->cache
[i
].object
;
1445 yaffs_flush_file_cache(obj
);
1450 /* Grab us a cache chunk for use.
1451 * First look for an empty one.
1452 * Then look for the least recently used non-dirty one.
1453 * Then look for the least recently used dirty one...., flush and look again.
1455 static struct yaffs_cache
*yaffs_grab_chunk_worker(struct yaffs_dev
*dev
)
1459 if (dev
->param
.n_caches
> 0) {
1460 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1461 if (!dev
->cache
[i
].object
)
1462 return &dev
->cache
[i
];
1468 static struct yaffs_cache
*yaffs_grab_chunk_cache(struct yaffs_dev
*dev
)
1470 struct yaffs_cache
*cache
;
1471 struct yaffs_obj
*the_obj
;
1476 if (dev
->param
.n_caches
< 1)
1479 /* Try find a non-dirty one... */
1481 cache
= yaffs_grab_chunk_worker(dev
);
1484 /* They were all dirty, find the LRU object and flush
1485 * its cache, then find again.
1486 * NB what's here is not very accurate,
1487 * we actually flush the object with the LRU chunk.
1490 /* With locking we can't assume we can use entry zero,
1491 * Set the_obj to a valid pointer for Coverity. */
1492 the_obj
= dev
->cache
[0].object
;
1497 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1498 if (dev
->cache
[i
].object
&&
1499 !dev
->cache
[i
].locked
&&
1500 (dev
->cache
[i
].last_use
< usage
||
1502 usage
= dev
->cache
[i
].last_use
;
1503 the_obj
= dev
->cache
[i
].object
;
1504 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 static 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
= strnlen(str
, YAFFS_MAX_ALIAS_LENGTH
);
2032 new_str
= kmalloc((len
+ 1) * sizeof(YCHAR
), GFP_NOFS
);
2034 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_fn
&&
2809 (dev
->param
.gc_control_fn(dev
) & 1) == 0)
2812 if (dev
->gc_disable
)
2813 /* Bail out so we don't get recursive gc */
2816 /* This loop should pass the first time.
2817 * Only loops here if the collection does not increase space.
2823 checkpt_block_adjust
= yaffs_calc_checkpt_blocks_required(dev
);
2826 dev
->param
.n_reserved_blocks
+ checkpt_block_adjust
+ 1;
2828 dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2830 /* If we need a block soon then do aggressive gc. */
2831 if (dev
->n_erased_blocks
< min_erased
)
2835 && erased_chunks
> (dev
->n_free_chunks
/ 4))
2838 if (dev
->gc_skip
> 20)
2840 if (erased_chunks
< dev
->n_free_chunks
/ 2 ||
2841 dev
->gc_skip
< 1 || background
)
2851 /* If we don't already have a block being gc'd then see if we
2852 * should start another */
2854 if (dev
->gc_block
< 1 && !aggressive
) {
2855 dev
->gc_block
= yaffs2_find_refresh_block(dev
);
2857 dev
->n_clean_ups
= 0;
2859 if (dev
->gc_block
< 1) {
2861 yaffs_find_gc_block(dev
, aggressive
, background
);
2863 dev
->n_clean_ups
= 0;
2866 if (dev
->gc_block
> 0) {
2869 dev
->passive_gc_count
++;
2871 yaffs_trace(YAFFS_TRACE_GC
,
2872 "yaffs: GC n_erased_blocks %d aggressive %d",
2873 dev
->n_erased_blocks
, aggressive
);
2875 gc_ok
= yaffs_gc_block(dev
, dev
->gc_block
, aggressive
);
2878 if (dev
->n_erased_blocks
< (dev
->param
.n_reserved_blocks
) &&
2879 dev
->gc_block
> 0) {
2880 yaffs_trace(YAFFS_TRACE_GC
,
2881 "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2882 dev
->n_erased_blocks
, max_tries
,
2885 } while ((dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
) &&
2886 (dev
->gc_block
> 0) && (max_tries
< 2));
2888 return aggressive
? gc_ok
: YAFFS_OK
;
2893 * Garbage collects. Intended to be called from a background thread.
2894 * Returns non-zero if at least half the free chunks are erased.
2896 int yaffs_bg_gc(struct yaffs_dev
*dev
, unsigned urgency
)
2898 int erased_chunks
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2900 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Background gc %u", urgency
);
2902 yaffs_check_gc(dev
, 1);
2903 return erased_chunks
> dev
->n_free_chunks
/ 2;
2906 /*-------------------- Data file manipulation -----------------*/
2908 static int yaffs_rd_data_obj(struct yaffs_obj
*in
, int inode_chunk
, u8
* buffer
)
2910 int nand_chunk
= yaffs_find_chunk_in_file(in
, inode_chunk
, NULL
);
2912 if (nand_chunk
>= 0)
2913 return yaffs_rd_chunk_tags_nand(in
->my_dev
, nand_chunk
,
2916 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
2917 "Chunk %d not found zero instead",
2919 /* get sane (zero) data if you read a hole */
2920 memset(buffer
, 0, in
->my_dev
->data_bytes_per_chunk
);
2926 void yaffs_chunk_del(struct yaffs_dev
*dev
, int chunk_id
, int mark_flash
,
2931 struct yaffs_ext_tags tags
;
2932 struct yaffs_block_info
*bi
;
2938 block
= chunk_id
/ dev
->param
.chunks_per_block
;
2939 page
= chunk_id
% dev
->param
.chunks_per_block
;
2941 if (!yaffs_check_chunk_bit(dev
, block
, page
))
2942 yaffs_trace(YAFFS_TRACE_VERIFY
,
2943 "Deleting invalid chunk %d", chunk_id
);
2945 bi
= yaffs_get_block_info(dev
, block
);
2947 yaffs2_update_oldest_dirty_seq(dev
, block
, bi
);
2949 yaffs_trace(YAFFS_TRACE_DELETION
,
2950 "line %d delete of chunk %d",
2953 if (!dev
->param
.is_yaffs2
&& mark_flash
&&
2954 bi
->block_state
!= YAFFS_BLOCK_STATE_COLLECTING
) {
2956 memset(&tags
, 0, sizeof(tags
));
2957 tags
.is_deleted
= 1;
2958 yaffs_wr_chunk_tags_nand(dev
, chunk_id
, NULL
, &tags
);
2959 yaffs_handle_chunk_update(dev
, chunk_id
, &tags
);
2961 dev
->n_unmarked_deletions
++;
2964 /* Pull out of the management area.
2965 * If the whole block became dirty, this will kick off an erasure.
2967 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
||
2968 bi
->block_state
== YAFFS_BLOCK_STATE_FULL
||
2969 bi
->block_state
== YAFFS_BLOCK_STATE_NEEDS_SCAN
||
2970 bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) {
2971 dev
->n_free_chunks
++;
2972 yaffs_clear_chunk_bit(dev
, block
, page
);
2975 if (bi
->pages_in_use
== 0 &&
2976 !bi
->has_shrink_hdr
&&
2977 bi
->block_state
!= YAFFS_BLOCK_STATE_ALLOCATING
&&
2978 bi
->block_state
!= YAFFS_BLOCK_STATE_NEEDS_SCAN
) {
2979 yaffs_block_became_dirty(dev
, block
);
2984 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
2985 const u8
*buffer
, int n_bytes
, int use_reserve
)
2987 /* Find old chunk Need to do this to get serial number
2988 * Write new one and patch into tree.
2989 * Invalidate old tags.
2993 struct yaffs_ext_tags prev_tags
;
2995 struct yaffs_ext_tags new_tags
;
2996 struct yaffs_dev
*dev
= in
->my_dev
;
2998 yaffs_check_gc(dev
, 0);
3000 /* Get the previous chunk at this location in the file if it exists.
3001 * If it does not exist then put a zero into the tree. This creates
3002 * the tnode now, rather than later when it is harder to clean up.
3004 prev_chunk_id
= yaffs_find_chunk_in_file(in
, inode_chunk
, &prev_tags
);
3005 if (prev_chunk_id
< 1 &&
3006 !yaffs_put_chunk_in_file(in
, inode_chunk
, 0, 0))
3009 /* Set up new tags */
3010 memset(&new_tags
, 0, sizeof(new_tags
));
3012 new_tags
.chunk_id
= inode_chunk
;
3013 new_tags
.obj_id
= in
->obj_id
;
3014 new_tags
.serial_number
=
3015 (prev_chunk_id
> 0) ? prev_tags
.serial_number
+ 1 : 1;
3016 new_tags
.n_bytes
= n_bytes
;
3018 if (n_bytes
< 1 || n_bytes
> dev
->param
.total_bytes_per_chunk
) {
3019 yaffs_trace(YAFFS_TRACE_ERROR
,
3020 "Writing %d bytes to chunk!!!!!!!!!",
3026 yaffs_write_new_chunk(dev
, buffer
, &new_tags
, use_reserve
);
3028 if (new_chunk_id
> 0) {
3029 yaffs_put_chunk_in_file(in
, inode_chunk
, new_chunk_id
, 0);
3031 if (prev_chunk_id
> 0)
3032 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3034 yaffs_verify_file_sane(in
);
3036 return new_chunk_id
;
3042 static int yaffs_do_xattrib_mod(struct yaffs_obj
*obj
, int set
,
3043 const YCHAR
*name
, const void *value
, int size
,
3046 struct yaffs_xattr_mod xmod
;
3054 xmod
.result
= -ENOSPC
;
3056 result
= yaffs_update_oh(obj
, NULL
, 0, 0, 0, &xmod
);
3064 static int yaffs_apply_xattrib_mod(struct yaffs_obj
*obj
, char *buffer
,
3065 struct yaffs_xattr_mod
*xmod
)
3068 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3069 struct yaffs_dev
*dev
= obj
->my_dev
;
3070 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3071 char *x_buffer
= buffer
+ x_offs
;
3075 nval_set(x_buffer
, x_size
, xmod
->name
, xmod
->data
,
3076 xmod
->size
, xmod
->flags
);
3078 retval
= nval_del(x_buffer
, x_size
, xmod
->name
);
3080 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3081 obj
->xattr_known
= 1;
3082 xmod
->result
= retval
;
3087 static int yaffs_do_xattrib_fetch(struct yaffs_obj
*obj
, const YCHAR
*name
,
3088 void *value
, int size
)
3090 char *buffer
= NULL
;
3092 struct yaffs_ext_tags tags
;
3093 struct yaffs_dev
*dev
= obj
->my_dev
;
3094 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3095 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3099 if (obj
->hdr_chunk
< 1)
3102 /* If we know that the object has no xattribs then don't do all the
3103 * reading and parsing.
3105 if (obj
->xattr_known
&& !obj
->has_xattr
) {
3112 buffer
= (char *)yaffs_get_temp_buffer(dev
);
3117 yaffs_rd_chunk_tags_nand(dev
, obj
->hdr_chunk
, (u8
*) buffer
, &tags
);
3119 if (result
!= YAFFS_OK
)
3122 x_buffer
= buffer
+ x_offs
;
3124 if (!obj
->xattr_known
) {
3125 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3126 obj
->xattr_known
= 1;
3130 retval
= nval_get(x_buffer
, x_size
, name
, value
, size
);
3132 retval
= nval_list(x_buffer
, x_size
, value
, size
);
3134 yaffs_release_temp_buffer(dev
, (u8
*) buffer
);
3138 int yaffs_set_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
,
3139 const void *value
, int size
, int flags
)
3141 return yaffs_do_xattrib_mod(obj
, 1, name
, value
, size
, flags
);
3144 int yaffs_remove_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
)
3146 return yaffs_do_xattrib_mod(obj
, 0, name
, NULL
, 0, 0);
3149 int yaffs_get_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
, void *value
,
3152 return yaffs_do_xattrib_fetch(obj
, name
, value
, size
);
3155 int yaffs_list_xattrib(struct yaffs_obj
*obj
, char *buffer
, int size
)
3157 return yaffs_do_xattrib_fetch(obj
, NULL
, buffer
, size
);
3160 static void yaffs_check_obj_details_loaded(struct yaffs_obj
*in
)
3163 struct yaffs_obj_hdr
*oh
;
3164 struct yaffs_dev
*dev
;
3165 struct yaffs_ext_tags tags
;
3167 int alloc_failed
= 0;
3169 if (!in
|| !in
->lazy_loaded
|| in
->hdr_chunk
< 1)
3173 in
->lazy_loaded
= 0;
3174 buf
= yaffs_get_temp_buffer(dev
);
3176 result
= yaffs_rd_chunk_tags_nand(dev
, in
->hdr_chunk
, buf
, &tags
);
3177 oh
= (struct yaffs_obj_hdr
*)buf
;
3179 in
->yst_mode
= oh
->yst_mode
;
3180 yaffs_load_attribs(in
, oh
);
3181 yaffs_set_obj_name_from_oh(in
, oh
);
3183 if (in
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
3184 in
->variant
.symlink_variant
.alias
=
3185 yaffs_clone_str(oh
->alias
);
3186 if (!in
->variant
.symlink_variant
.alias
)
3187 alloc_failed
= 1; /* Not returned */
3189 yaffs_release_temp_buffer(dev
, buf
);
3192 static void yaffs_load_name_from_oh(struct yaffs_dev
*dev
, YCHAR
*name
,
3193 const YCHAR
*oh_name
, int buff_size
)
3195 #ifdef CONFIG_YAFFS_AUTO_UNICODE
3196 if (dev
->param
.auto_unicode
) {
3198 /* It is an ASCII name, do an ASCII to
3199 * unicode conversion */
3200 const char *ascii_oh_name
= (const char *)oh_name
;
3201 int n
= buff_size
- 1;
3202 while (n
> 0 && *ascii_oh_name
) {
3203 *name
= *ascii_oh_name
;
3209 strncpy(name
, oh_name
+ 1, buff_size
- 1);
3216 strncpy(name
, oh_name
, buff_size
- 1);
3220 static void yaffs_load_oh_from_name(struct yaffs_dev
*dev
, YCHAR
*oh_name
,
3223 #ifdef CONFIG_YAFFS_AUTO_UNICODE
3228 if (dev
->param
.auto_unicode
) {
3233 /* Figure out if the name will fit in ascii character set */
3234 while (is_ascii
&& *w
) {
3241 /* It is an ASCII name, so convert unicode to ascii */
3242 char *ascii_oh_name
= (char *)oh_name
;
3243 int n
= YAFFS_MAX_NAME_LENGTH
- 1;
3244 while (n
> 0 && *name
) {
3245 *ascii_oh_name
= *name
;
3251 /* Unicode name, so save starting at the second YCHAR */
3253 strncpy(oh_name
+ 1, name
, YAFFS_MAX_NAME_LENGTH
- 2);
3260 strncpy(oh_name
, name
, YAFFS_MAX_NAME_LENGTH
- 1);
3264 /* UpdateObjectHeader updates the header on NAND for an object.
3265 * If name is not NULL, then that new name is used.
3267 int yaffs_update_oh(struct yaffs_obj
*in
, const YCHAR
*name
, int force
,
3268 int is_shrink
, int shadows
, struct yaffs_xattr_mod
*xmod
)
3271 struct yaffs_block_info
*bi
;
3272 struct yaffs_dev
*dev
= in
->my_dev
;
3277 struct yaffs_ext_tags new_tags
;
3278 struct yaffs_ext_tags old_tags
;
3279 const YCHAR
*alias
= NULL
;
3281 YCHAR old_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
3282 struct yaffs_obj_hdr
*oh
= NULL
;
3283 loff_t file_size
= 0;
3285 strcpy(old_name
, _Y("silly old name"));
3287 if (in
->fake
&& in
!= dev
->root_dir
&& !force
&& !xmod
)
3290 yaffs_check_gc(dev
, 0);
3291 yaffs_check_obj_details_loaded(in
);
3293 buffer
= yaffs_get_temp_buffer(in
->my_dev
);
3294 oh
= (struct yaffs_obj_hdr
*)buffer
;
3296 prev_chunk_id
= in
->hdr_chunk
;
3298 if (prev_chunk_id
> 0) {
3299 result
= yaffs_rd_chunk_tags_nand(dev
, prev_chunk_id
,
3302 yaffs_verify_oh(in
, oh
, &old_tags
, 0);
3303 memcpy(old_name
, oh
->name
, sizeof(oh
->name
));
3304 memset(buffer
, 0xff, sizeof(struct yaffs_obj_hdr
));
3306 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
3309 oh
->type
= in
->variant_type
;
3310 oh
->yst_mode
= in
->yst_mode
;
3311 oh
->shadows_obj
= oh
->inband_shadowed_obj_id
= shadows
;
3313 yaffs_load_attribs_oh(oh
, in
);
3316 oh
->parent_obj_id
= in
->parent
->obj_id
;
3318 oh
->parent_obj_id
= 0;
3320 if (name
&& *name
) {
3321 memset(oh
->name
, 0, sizeof(oh
->name
));
3322 yaffs_load_oh_from_name(dev
, oh
->name
, name
);
3323 } else if (prev_chunk_id
> 0) {
3324 memcpy(oh
->name
, old_name
, sizeof(oh
->name
));
3326 memset(oh
->name
, 0, sizeof(oh
->name
));
3329 oh
->is_shrink
= is_shrink
;
3331 switch (in
->variant_type
) {
3332 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3333 /* Should not happen */
3335 case YAFFS_OBJECT_TYPE_FILE
:
3336 if (oh
->parent_obj_id
!= YAFFS_OBJECTID_DELETED
&&
3337 oh
->parent_obj_id
!= YAFFS_OBJECTID_UNLINKED
)
3338 file_size
= in
->variant
.file_variant
.file_size
;
3339 yaffs_oh_size_load(oh
, file_size
);
3341 case YAFFS_OBJECT_TYPE_HARDLINK
:
3342 oh
->equiv_id
= in
->variant
.hardlink_variant
.equiv_id
;
3344 case YAFFS_OBJECT_TYPE_SPECIAL
:
3347 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3350 case YAFFS_OBJECT_TYPE_SYMLINK
:
3351 alias
= in
->variant
.symlink_variant
.alias
;
3353 alias
= _Y("no alias");
3354 strncpy(oh
->alias
, alias
, YAFFS_MAX_ALIAS_LENGTH
);
3355 oh
->alias
[YAFFS_MAX_ALIAS_LENGTH
] = 0;
3359 /* process any xattrib modifications */
3361 yaffs_apply_xattrib_mod(in
, (char *)buffer
, xmod
);
3364 memset(&new_tags
, 0, sizeof(new_tags
));
3366 new_tags
.chunk_id
= 0;
3367 new_tags
.obj_id
= in
->obj_id
;
3368 new_tags
.serial_number
= in
->serial
;
3370 /* Add extra info for file header */
3371 new_tags
.extra_available
= 1;
3372 new_tags
.extra_parent_id
= oh
->parent_obj_id
;
3373 new_tags
.extra_file_size
= file_size
;
3374 new_tags
.extra_is_shrink
= oh
->is_shrink
;
3375 new_tags
.extra_equiv_id
= oh
->equiv_id
;
3376 new_tags
.extra_shadows
= (oh
->shadows_obj
> 0) ? 1 : 0;
3377 new_tags
.extra_obj_type
= in
->variant_type
;
3378 yaffs_verify_oh(in
, oh
, &new_tags
, 1);
3380 /* Create new chunk in NAND */
3382 yaffs_write_new_chunk(dev
, buffer
, &new_tags
,
3383 (prev_chunk_id
> 0) ? 1 : 0);
3386 yaffs_release_temp_buffer(dev
, buffer
);
3388 if (new_chunk_id
< 0)
3389 return new_chunk_id
;
3391 in
->hdr_chunk
= new_chunk_id
;
3393 if (prev_chunk_id
> 0)
3394 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3396 if (!yaffs_obj_cache_dirty(in
))
3399 /* If this was a shrink, then mark the block
3400 * that the chunk lives on */
3402 bi
= yaffs_get_block_info(in
->my_dev
,
3404 in
->my_dev
->param
.chunks_per_block
);
3405 bi
->has_shrink_hdr
= 1;
3409 return new_chunk_id
;
3412 /*--------------------- File read/write ------------------------
3413 * Read and write have very similar structures.
3414 * In general the read/write has three parts to it
3415 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3416 * Some complete chunks
3417 * An incomplete chunk to end off with
3419 * Curve-balls: the first chunk might also be the last chunk.
3422 int yaffs_file_rd(struct yaffs_obj
*in
, u8
* buffer
, loff_t offset
, int n_bytes
)
3429 struct yaffs_cache
*cache
;
3430 struct yaffs_dev
*dev
;
3435 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3438 /* OK now check for the curveball where the start and end are in
3441 if ((start
+ n
) < dev
->data_bytes_per_chunk
)
3444 n_copy
= dev
->data_bytes_per_chunk
- start
;
3446 cache
= yaffs_find_chunk_cache(in
, chunk
);
3448 /* If the chunk is already in the cache or it is less than
3449 * a whole chunk or we're using inband tags then use the cache
3450 * (if there is caching) else bypass the cache.
3452 if (cache
|| n_copy
!= dev
->data_bytes_per_chunk
||
3453 dev
->param
.inband_tags
) {
3454 if (dev
->param
.n_caches
> 0) {
3456 /* If we can't find the data in the cache,
3457 * then load it up. */
3461 yaffs_grab_chunk_cache(in
->my_dev
);
3463 cache
->chunk_id
= chunk
;
3466 yaffs_rd_data_obj(in
, chunk
,
3471 yaffs_use_cache(dev
, cache
, 0);
3475 memcpy(buffer
, &cache
->data
[start
], n_copy
);
3479 /* Read into the local buffer then copy.. */
3482 yaffs_get_temp_buffer(dev
);
3483 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3485 memcpy(buffer
, &local_buffer
[start
], n_copy
);
3487 yaffs_release_temp_buffer(dev
, local_buffer
);
3490 /* A full chunk. Read directly into the buffer. */
3491 yaffs_rd_data_obj(in
, chunk
, buffer
);
3501 int yaffs_do_file_wr(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3502 int n_bytes
, int write_through
)
3511 loff_t start_write
= offset
;
3512 int chunk_written
= 0;
3515 struct yaffs_dev
*dev
;
3519 while (n
> 0 && chunk_written
>= 0) {
3520 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3522 if (((loff_t
)chunk
) *
3523 dev
->data_bytes_per_chunk
+ start
!= offset
||
3524 start
>= dev
->data_bytes_per_chunk
) {
3525 yaffs_trace(YAFFS_TRACE_ERROR
,
3526 "AddrToChunk of offset %lld gives chunk %d start %d",
3527 offset
, chunk
, start
);
3529 chunk
++; /* File pos to chunk in file offset */
3531 /* OK now check for the curveball where the start and end are in
3535 if ((start
+ n
) < dev
->data_bytes_per_chunk
) {
3538 /* Now calculate how many bytes to write back....
3539 * If we're overwriting and not writing to then end of
3540 * file then we need to write back as much as was there
3544 chunk_start
= (((loff_t
)(chunk
- 1)) *
3545 dev
->data_bytes_per_chunk
);
3547 if (chunk_start
> in
->variant
.file_variant
.file_size
)
3548 n_bytes_read
= 0; /* Past end of file */
3551 in
->variant
.file_variant
.file_size
-
3554 if (n_bytes_read
> dev
->data_bytes_per_chunk
)
3555 n_bytes_read
= dev
->data_bytes_per_chunk
;
3559 (start
+ n
)) ? n_bytes_read
: (start
+ n
);
3561 if (n_writeback
< 0 ||
3562 n_writeback
> dev
->data_bytes_per_chunk
)
3566 n_copy
= dev
->data_bytes_per_chunk
- start
;
3567 n_writeback
= dev
->data_bytes_per_chunk
;
3570 if (n_copy
!= dev
->data_bytes_per_chunk
||
3571 !dev
->param
.cache_bypass_aligned
||
3572 dev
->param
.inband_tags
) {
3573 /* An incomplete start or end chunk (or maybe both
3574 * start and end chunk), or we're using inband tags,
3575 * or we're forcing writes through the cache,
3576 * so we want to use the cache buffers.
3578 if (dev
->param
.n_caches
> 0) {
3579 struct yaffs_cache
*cache
;
3581 /* If we can't find the data in the cache, then
3583 cache
= yaffs_find_chunk_cache(in
, chunk
);
3586 yaffs_check_alloc_available(dev
, 1)) {
3587 cache
= yaffs_grab_chunk_cache(dev
);
3589 cache
->chunk_id
= chunk
;
3592 yaffs_rd_data_obj(in
, chunk
,
3596 !yaffs_check_alloc_available(dev
,
3598 /* Drop the cache if it was a read cache
3599 * item and no space check has been made
3606 yaffs_use_cache(dev
, cache
, 1);
3609 memcpy(&cache
->data
[start
], buffer
,
3613 cache
->n_bytes
= n_writeback
;
3615 if (write_through
) {
3625 chunk_written
= -1; /* fail write */
3628 /* An incomplete start or end chunk (or maybe
3629 * both start and end chunk). Read into the
3630 * local buffer then copy over and write back.
3633 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3635 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3636 memcpy(&local_buffer
[start
], buffer
, n_copy
);
3639 yaffs_wr_data_obj(in
, chunk
,
3643 yaffs_release_temp_buffer(dev
, local_buffer
);
3646 /* A full chunk. Write directly from the buffer. */
3649 yaffs_wr_data_obj(in
, chunk
, buffer
,
3650 dev
->data_bytes_per_chunk
, 0);
3652 /* Since we've overwritten the cached data,
3653 * we better invalidate it. */
3654 yaffs_invalidate_chunk_cache(in
, chunk
);
3657 if (chunk_written
>= 0) {
3665 /* Update file object */
3667 if ((start_write
+ n_done
) > in
->variant
.file_variant
.file_size
)
3668 in
->variant
.file_variant
.file_size
= (start_write
+ n_done
);
3674 int yaffs_wr_file(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3675 int n_bytes
, int write_through
)
3677 yaffs2_handle_hole(in
, offset
);
3678 return yaffs_do_file_wr(in
, buffer
, offset
, n_bytes
, write_through
);
3681 /* ---------------------- File resizing stuff ------------------ */
3683 static void yaffs_prune_chunks(struct yaffs_obj
*in
, loff_t new_size
)
3686 struct yaffs_dev
*dev
= in
->my_dev
;
3687 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3695 yaffs_addr_to_chunk(dev
, old_size
- 1, &last_del
, &dummy
);
3699 yaffs_addr_to_chunk(dev
, new_size
+ dev
->data_bytes_per_chunk
- 1,
3700 &start_del
, &dummy
);
3704 /* Delete backwards so that we don't end up with holes if
3705 * power is lost part-way through the operation.
3707 for (i
= last_del
; i
>= start_del
; i
--) {
3708 /* NB this could be optimised somewhat,
3709 * eg. could retrieve the tags and write them without
3710 * using yaffs_chunk_del
3713 chunk_id
= yaffs_find_del_file_chunk(in
, i
, NULL
);
3719 (dev
->internal_start_block
* dev
->param
.chunks_per_block
) ||
3721 ((dev
->internal_end_block
+ 1) *
3722 dev
->param
.chunks_per_block
)) {
3723 yaffs_trace(YAFFS_TRACE_ALWAYS
,
3724 "Found daft chunk_id %d for %d",
3727 in
->n_data_chunks
--;
3728 yaffs_chunk_del(dev
, chunk_id
, 1, __LINE__
);
3733 void yaffs_resize_file_down(struct yaffs_obj
*obj
, loff_t new_size
)
3737 struct yaffs_dev
*dev
= obj
->my_dev
;
3739 yaffs_addr_to_chunk(dev
, new_size
, &new_full
, &new_partial
);
3741 yaffs_prune_chunks(obj
, new_size
);
3743 if (new_partial
!= 0) {
3744 int last_chunk
= 1 + new_full
;
3745 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3747 /* Rewrite the last chunk with its new size and zero pad */
3748 yaffs_rd_data_obj(obj
, last_chunk
, local_buffer
);
3749 memset(local_buffer
+ new_partial
, 0,
3750 dev
->data_bytes_per_chunk
- new_partial
);
3752 yaffs_wr_data_obj(obj
, last_chunk
, local_buffer
,
3755 yaffs_release_temp_buffer(dev
, local_buffer
);
3758 obj
->variant
.file_variant
.file_size
= new_size
;
3760 yaffs_prune_tree(dev
, &obj
->variant
.file_variant
);
3763 int yaffs_resize_file(struct yaffs_obj
*in
, loff_t new_size
)
3765 struct yaffs_dev
*dev
= in
->my_dev
;
3766 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3768 yaffs_flush_file_cache(in
);
3769 yaffs_invalidate_whole_cache(in
);
3771 yaffs_check_gc(dev
, 0);
3773 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
)
3776 if (new_size
== old_size
)
3779 if (new_size
> old_size
) {
3780 yaffs2_handle_hole(in
, new_size
);
3781 in
->variant
.file_variant
.file_size
= new_size
;
3783 /* new_size < old_size */
3784 yaffs_resize_file_down(in
, new_size
);
3787 /* Write a new object header to reflect the resize.
3788 * show we've shrunk the file, if need be
3789 * Do this only if the file is not in the deleted directories
3790 * and is not shadowed.
3794 in
->parent
->obj_id
!= YAFFS_OBJECTID_UNLINKED
&&
3795 in
->parent
->obj_id
!= YAFFS_OBJECTID_DELETED
)
3796 yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
);
3801 int yaffs_flush_file(struct yaffs_obj
*in
, int update_time
, int data_sync
)
3806 yaffs_flush_file_cache(in
);
3812 yaffs_load_current_time(in
, 0, 0);
3814 return (yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
) >= 0) ?
3815 YAFFS_OK
: YAFFS_FAIL
;
3819 /* yaffs_del_file deletes the whole file data
3820 * and the inode associated with the file.
3821 * It does not delete the links associated with the file.
3823 static int yaffs_unlink_file_if_needed(struct yaffs_obj
*in
)
3827 struct yaffs_dev
*dev
= in
->my_dev
;
3834 yaffs_change_obj_name(in
, in
->my_dev
->del_dir
,
3835 _Y("deleted"), 0, 0);
3836 yaffs_trace(YAFFS_TRACE_TRACING
,
3837 "yaffs: immediate deletion of file %d",
3840 in
->my_dev
->n_deleted_files
++;
3841 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3842 yaffs_resize_file(in
, 0);
3843 yaffs_soft_del_file(in
);
3846 yaffs_change_obj_name(in
, in
->my_dev
->unlinked_dir
,
3847 _Y("unlinked"), 0, 0);
3852 static int yaffs_del_file(struct yaffs_obj
*in
)
3854 int ret_val
= YAFFS_OK
;
3855 int deleted
; /* Need to cache value on stack if in is freed */
3856 struct yaffs_dev
*dev
= in
->my_dev
;
3858 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3859 yaffs_resize_file(in
, 0);
3861 if (in
->n_data_chunks
> 0) {
3862 /* Use soft deletion if there is data in the file.
3863 * That won't be the case if it has been resized to zero.
3866 ret_val
= yaffs_unlink_file_if_needed(in
);
3868 deleted
= in
->deleted
;
3870 if (ret_val
== YAFFS_OK
&& in
->unlinked
&& !in
->deleted
) {
3873 in
->my_dev
->n_deleted_files
++;
3874 yaffs_soft_del_file(in
);
3876 return deleted
? YAFFS_OK
: YAFFS_FAIL
;
3878 /* The file has no data chunks so we toss it immediately */
3879 yaffs_free_tnode(in
->my_dev
, in
->variant
.file_variant
.top
);
3880 in
->variant
.file_variant
.top
= NULL
;
3881 yaffs_generic_obj_del(in
);
3887 int yaffs_is_non_empty_dir(struct yaffs_obj
*obj
)
3890 obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
) &&
3891 !(list_empty(&obj
->variant
.dir_variant
.children
));
3894 static int yaffs_del_dir(struct yaffs_obj
*obj
)
3896 /* First check that the directory is empty. */
3897 if (yaffs_is_non_empty_dir(obj
))
3900 return yaffs_generic_obj_del(obj
);
3903 static int yaffs_del_symlink(struct yaffs_obj
*in
)
3905 kfree(in
->variant
.symlink_variant
.alias
);
3906 in
->variant
.symlink_variant
.alias
= NULL
;
3908 return yaffs_generic_obj_del(in
);
3911 static int yaffs_del_link(struct yaffs_obj
*in
)
3913 /* remove this hardlink from the list associated with the equivalent
3916 list_del_init(&in
->hard_links
);
3917 return yaffs_generic_obj_del(in
);
3920 int yaffs_del_obj(struct yaffs_obj
*obj
)
3924 switch (obj
->variant_type
) {
3925 case YAFFS_OBJECT_TYPE_FILE
:
3926 ret_val
= yaffs_del_file(obj
);
3928 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3929 if (!list_empty(&obj
->variant
.dir_variant
.dirty
)) {
3930 yaffs_trace(YAFFS_TRACE_BACKGROUND
,
3931 "Remove object %d from dirty directories",
3933 list_del_init(&obj
->variant
.dir_variant
.dirty
);
3935 return yaffs_del_dir(obj
);
3937 case YAFFS_OBJECT_TYPE_SYMLINK
:
3938 ret_val
= yaffs_del_symlink(obj
);
3940 case YAFFS_OBJECT_TYPE_HARDLINK
:
3941 ret_val
= yaffs_del_link(obj
);
3943 case YAFFS_OBJECT_TYPE_SPECIAL
:
3944 ret_val
= yaffs_generic_obj_del(obj
);
3946 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3948 break; /* should not happen. */
3953 static int yaffs_unlink_worker(struct yaffs_obj
*obj
)
3963 yaffs_update_parent(obj
->parent
);
3965 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
3966 return yaffs_del_link(obj
);
3967 } else if (!list_empty(&obj
->hard_links
)) {
3968 /* Curve ball: We're unlinking an object that has a hardlink.
3970 * This problem arises because we are not strictly following
3971 * The Linux link/inode model.
3973 * We can't really delete the object.
3974 * Instead, we do the following:
3975 * - Select a hardlink.
3976 * - Unhook it from the hard links
3977 * - Move it from its parent directory so that the rename works.
3978 * - Rename the object to the hardlink's name.
3979 * - Delete the hardlink
3982 struct yaffs_obj
*hl
;
3983 struct yaffs_obj
*parent
;
3985 YCHAR name
[YAFFS_MAX_NAME_LENGTH
+ 1];
3987 hl
= list_entry(obj
->hard_links
.next
, struct yaffs_obj
,
3990 yaffs_get_obj_name(hl
, name
, YAFFS_MAX_NAME_LENGTH
+ 1);
3991 parent
= hl
->parent
;
3993 list_del_init(&hl
->hard_links
);
3995 yaffs_add_obj_to_dir(obj
->my_dev
->unlinked_dir
, hl
);
3997 ret_val
= yaffs_change_obj_name(obj
, parent
, name
, 0, 0);
3999 if (ret_val
== YAFFS_OK
)
4000 ret_val
= yaffs_generic_obj_del(hl
);
4004 } else if (del_now
) {
4005 switch (obj
->variant_type
) {
4006 case YAFFS_OBJECT_TYPE_FILE
:
4007 return yaffs_del_file(obj
);
4009 case YAFFS_OBJECT_TYPE_DIRECTORY
:
4010 list_del_init(&obj
->variant
.dir_variant
.dirty
);
4011 return yaffs_del_dir(obj
);
4013 case YAFFS_OBJECT_TYPE_SYMLINK
:
4014 return yaffs_del_symlink(obj
);
4016 case YAFFS_OBJECT_TYPE_SPECIAL
:
4017 return yaffs_generic_obj_del(obj
);
4019 case YAFFS_OBJECT_TYPE_HARDLINK
:
4020 case YAFFS_OBJECT_TYPE_UNKNOWN
:
4024 } else if (yaffs_is_non_empty_dir(obj
)) {
4027 return yaffs_change_obj_name(obj
, obj
->my_dev
->unlinked_dir
,
4028 _Y("unlinked"), 0, 0);
4032 static int yaffs_unlink_obj(struct yaffs_obj
*obj
)
4034 if (obj
&& obj
->unlink_allowed
)
4035 return yaffs_unlink_worker(obj
);
4040 int yaffs_unlinker(struct yaffs_obj
*dir
, const YCHAR
*name
)
4042 struct yaffs_obj
*obj
;
4044 obj
= yaffs_find_by_name(dir
, name
);
4045 return yaffs_unlink_obj(obj
);
4049 * If old_name is NULL then we take old_dir as the object to be renamed.
4051 int yaffs_rename_obj(struct yaffs_obj
*old_dir
, const YCHAR
*old_name
,
4052 struct yaffs_obj
*new_dir
, const YCHAR
*new_name
)
4054 struct yaffs_obj
*obj
= NULL
;
4055 struct yaffs_obj
*existing_target
= NULL
;
4058 struct yaffs_dev
*dev
;
4060 if (!old_dir
|| old_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4064 if (!new_dir
|| new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4069 dev
= old_dir
->my_dev
;
4071 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4072 /* Special case for case insemsitive systems.
4073 * While look-up is case insensitive, the name isn't.
4074 * Therefore we might want to change x.txt to X.txt
4076 if (old_dir
== new_dir
&&
4077 old_name
&& new_name
&&
4078 strcmp(old_name
, new_name
) == 0)
4082 if (strnlen(new_name
, YAFFS_MAX_NAME_LENGTH
+ 1) >
4083 YAFFS_MAX_NAME_LENGTH
)
4088 obj
= yaffs_find_by_name(old_dir
, old_name
);
4091 old_dir
= obj
->parent
;
4094 if (obj
&& obj
->rename_allowed
) {
4095 /* Now handle an existing target, if there is one */
4096 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
4097 if (yaffs_is_non_empty_dir(existing_target
)) {
4098 return YAFFS_FAIL
; /* ENOTEMPTY */
4099 } else if (existing_target
&& existing_target
!= obj
) {
4100 /* Nuke the target first, using shadowing,
4101 * but only if it isn't the same object.
4103 * Note we must disable gc here otherwise it can mess
4107 dev
->gc_disable
= 1;
4108 yaffs_change_obj_name(obj
, new_dir
, new_name
, force
,
4109 existing_target
->obj_id
);
4110 existing_target
->is_shadowed
= 1;
4111 yaffs_unlink_obj(existing_target
);
4112 dev
->gc_disable
= 0;
4115 result
= yaffs_change_obj_name(obj
, new_dir
, new_name
, 1, 0);
4117 yaffs_update_parent(old_dir
);
4118 if (new_dir
!= old_dir
)
4119 yaffs_update_parent(new_dir
);
4126 /*----------------------- Initialisation Scanning ---------------------- */
4128 void yaffs_handle_shadowed_obj(struct yaffs_dev
*dev
, int obj_id
,
4129 int backward_scanning
)
4131 struct yaffs_obj
*obj
;
4133 if (backward_scanning
) {
4134 /* Handle YAFFS2 case (backward scanning)
4135 * If the shadowed object exists then ignore.
4137 obj
= yaffs_find_by_number(dev
, obj_id
);
4142 /* Let's create it (if it does not exist) assuming it is a file so that
4143 * it can do shrinking etc.
4144 * We put it in unlinked dir to be cleaned up after the scanning
4147 yaffs_find_or_create_by_number(dev
, obj_id
, YAFFS_OBJECT_TYPE_FILE
);
4150 obj
->is_shadowed
= 1;
4151 yaffs_add_obj_to_dir(dev
->unlinked_dir
, obj
);
4152 obj
->variant
.file_variant
.shrink_size
= 0;
4153 obj
->valid
= 1; /* So that we don't read any other info. */
4156 void yaffs_link_fixup(struct yaffs_dev
*dev
, struct list_head
*hard_list
)
4158 struct list_head
*lh
;
4159 struct list_head
*save
;
4160 struct yaffs_obj
*hl
;
4161 struct yaffs_obj
*in
;
4163 list_for_each_safe(lh
, save
, hard_list
) {
4164 hl
= list_entry(lh
, struct yaffs_obj
, hard_links
);
4165 in
= yaffs_find_by_number(dev
,
4166 hl
->variant
.hardlink_variant
.equiv_id
);
4169 /* Add the hardlink pointers */
4170 hl
->variant
.hardlink_variant
.equiv_obj
= in
;
4171 list_add(&hl
->hard_links
, &in
->hard_links
);
4173 /* Todo Need to report/handle this better.
4174 * Got a problem... hardlink to a non-existant object
4176 hl
->variant
.hardlink_variant
.equiv_obj
= NULL
;
4177 INIT_LIST_HEAD(&hl
->hard_links
);
4182 static void yaffs_strip_deleted_objs(struct yaffs_dev
*dev
)
4185 * Sort out state of unlinked and deleted objects after scanning.
4187 struct list_head
*i
;
4188 struct list_head
*n
;
4189 struct yaffs_obj
*l
;
4194 /* Soft delete all the unlinked files */
4195 list_for_each_safe(i
, n
,
4196 &dev
->unlinked_dir
->variant
.dir_variant
.children
) {
4197 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4201 list_for_each_safe(i
, n
, &dev
->del_dir
->variant
.dir_variant
.children
) {
4202 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4208 * This code iterates through all the objects making sure that they are rooted.
4209 * Any unrooted objects are re-rooted in lost+found.
4210 * An object needs to be in one of:
4211 * - Directly under deleted, unlinked
4212 * - Directly or indirectly under root.
4215 * This code assumes that we don't ever change the current relationships
4216 * between directories:
4217 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4218 * lost-n-found->parent == root_dir
4220 * This fixes the problem where directories might have inadvertently been
4221 * deleted leaving the object "hanging" without being rooted in the
4225 static int yaffs_has_null_parent(struct yaffs_dev
*dev
, struct yaffs_obj
*obj
)
4227 return (obj
== dev
->del_dir
||
4228 obj
== dev
->unlinked_dir
|| obj
== dev
->root_dir
);
4231 static void yaffs_fix_hanging_objs(struct yaffs_dev
*dev
)
4233 struct yaffs_obj
*obj
;
4234 struct yaffs_obj
*parent
;
4236 struct list_head
*lh
;
4237 struct list_head
*n
;
4244 /* Iterate through the objects in each hash entry,
4245 * looking at each object.
4246 * Make sure it is rooted.
4249 for (i
= 0; i
< YAFFS_NOBJECT_BUCKETS
; i
++) {
4250 list_for_each_safe(lh
, n
, &dev
->obj_bucket
[i
].list
) {
4251 obj
= list_entry(lh
, struct yaffs_obj
, hash_link
);
4252 parent
= obj
->parent
;
4254 if (yaffs_has_null_parent(dev
, obj
)) {
4255 /* These directories are not hanging */
4257 } else if (!parent
||
4258 parent
->variant_type
!=
4259 YAFFS_OBJECT_TYPE_DIRECTORY
) {
4261 } else if (yaffs_has_null_parent(dev
, parent
)) {
4265 * Need to follow the parent chain to
4266 * see if it is hanging.
4271 while (parent
!= dev
->root_dir
&&
4273 parent
->parent
->variant_type
==
4274 YAFFS_OBJECT_TYPE_DIRECTORY
&&
4276 parent
= parent
->parent
;
4279 if (parent
!= dev
->root_dir
)
4283 yaffs_trace(YAFFS_TRACE_SCAN
,
4284 "Hanging object %d moved to lost and found",
4286 yaffs_add_obj_to_dir(dev
->lost_n_found
, obj
);
4293 * Delete directory contents for cleaning up lost and found.
4295 static void yaffs_del_dir_contents(struct yaffs_obj
*dir
)
4297 struct yaffs_obj
*obj
;
4298 struct list_head
*lh
;
4299 struct list_head
*n
;
4301 if (dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
4304 list_for_each_safe(lh
, n
, &dir
->variant
.dir_variant
.children
) {
4305 obj
= list_entry(lh
, struct yaffs_obj
, siblings
);
4306 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
)
4307 yaffs_del_dir_contents(obj
);
4308 yaffs_trace(YAFFS_TRACE_SCAN
,
4309 "Deleting lost_found object %d",
4311 yaffs_unlink_obj(obj
);
4315 static void yaffs_empty_l_n_f(struct yaffs_dev
*dev
)
4317 yaffs_del_dir_contents(dev
->lost_n_found
);
4321 struct yaffs_obj
*yaffs_find_by_name(struct yaffs_obj
*directory
,
4325 struct list_head
*i
;
4326 YCHAR buffer
[YAFFS_MAX_NAME_LENGTH
+ 1];
4327 struct yaffs_obj
*l
;
4333 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4334 "tragedy: yaffs_find_by_name: null pointer directory"
4339 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4340 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4341 "tragedy: yaffs_find_by_name: non-directory"
4346 sum
= yaffs_calc_name_sum(name
);
4348 list_for_each(i
, &directory
->variant
.dir_variant
.children
) {
4349 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4351 if (l
->parent
!= directory
)
4354 yaffs_check_obj_details_loaded(l
);
4356 /* Special case for lost-n-found */
4357 if (l
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4358 if (!strcmp(name
, YAFFS_LOSTNFOUND_NAME
))
4360 } else if (l
->sum
== sum
|| l
->hdr_chunk
<= 0) {
4361 /* LostnFound chunk called Objxxx
4364 yaffs_get_obj_name(l
, buffer
,
4365 YAFFS_MAX_NAME_LENGTH
+ 1);
4366 if (!strncmp(name
, buffer
, YAFFS_MAX_NAME_LENGTH
))
4373 /* GetEquivalentObject dereferences any hard links to get to the
4377 struct yaffs_obj
*yaffs_get_equivalent_obj(struct yaffs_obj
*obj
)
4379 if (obj
&& obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
4380 obj
= obj
->variant
.hardlink_variant
.equiv_obj
;
4381 yaffs_check_obj_details_loaded(obj
);
4387 * A note or two on object names.
4388 * * If the object name is missing, we then make one up in the form objnnn
4390 * * ASCII names are stored in the object header's name field from byte zero
4391 * * Unicode names are historically stored starting from byte zero.
4393 * Then there are automatic Unicode names...
4394 * The purpose of these is to save names in a way that can be read as
4395 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4396 * system to share files.
4398 * These automatic unicode are stored slightly differently...
4399 * - If the name can fit in the ASCII character space then they are saved as
4400 * ascii names as per above.
4401 * - If the name needs Unicode then the name is saved in Unicode
4402 * starting at oh->name[1].
4405 static void yaffs_fix_null_name(struct yaffs_obj
*obj
, YCHAR
*name
,
4408 /* Create an object name if we could not find one. */
4409 if (strnlen(name
, YAFFS_MAX_NAME_LENGTH
) == 0) {
4410 YCHAR local_name
[20];
4411 YCHAR num_string
[20];
4412 YCHAR
*x
= &num_string
[19];
4413 unsigned v
= obj
->obj_id
;
4417 *x
= '0' + (v
% 10);
4420 /* make up a name */
4421 strcpy(local_name
, YAFFS_LOSTNFOUND_PREFIX
);
4422 strcat(local_name
, x
);
4423 strncpy(name
, local_name
, buffer_size
- 1);
4427 int yaffs_get_obj_name(struct yaffs_obj
*obj
, YCHAR
*name
, int buffer_size
)
4429 memset(name
, 0, buffer_size
* sizeof(YCHAR
));
4430 yaffs_check_obj_details_loaded(obj
);
4431 if (obj
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4432 strncpy(name
, YAFFS_LOSTNFOUND_NAME
, buffer_size
- 1);
4433 } else if (obj
->short_name
[0]) {
4434 strcpy(name
, obj
->short_name
);
4435 } else if (obj
->hdr_chunk
> 0) {
4437 u8
*buffer
= yaffs_get_temp_buffer(obj
->my_dev
);
4439 struct yaffs_obj_hdr
*oh
= (struct yaffs_obj_hdr
*)buffer
;
4441 memset(buffer
, 0, obj
->my_dev
->data_bytes_per_chunk
);
4443 if (obj
->hdr_chunk
> 0) {
4444 result
= yaffs_rd_chunk_tags_nand(obj
->my_dev
,
4448 yaffs_load_name_from_oh(obj
->my_dev
, name
, oh
->name
,
4451 yaffs_release_temp_buffer(obj
->my_dev
, buffer
);
4454 yaffs_fix_null_name(obj
, name
, buffer_size
);
4456 return strnlen(name
, YAFFS_MAX_NAME_LENGTH
);
4459 loff_t
yaffs_get_obj_length(struct yaffs_obj
*obj
)
4461 /* Dereference any hard linking */
4462 obj
= yaffs_get_equivalent_obj(obj
);
4464 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_FILE
)
4465 return obj
->variant
.file_variant
.file_size
;
4466 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
4467 if (!obj
->variant
.symlink_variant
.alias
)
4469 return strnlen(obj
->variant
.symlink_variant
.alias
,
4470 YAFFS_MAX_ALIAS_LENGTH
);
4472 /* Only a directory should drop through to here */
4473 return obj
->my_dev
->data_bytes_per_chunk
;
4477 int yaffs_get_obj_link_count(struct yaffs_obj
*obj
)
4480 struct list_head
*i
;
4483 count
++; /* the object itself */
4485 list_for_each(i
, &obj
->hard_links
)
4486 count
++; /* add the hard links; */
4491 int yaffs_get_obj_inode(struct yaffs_obj
*obj
)
4493 obj
= yaffs_get_equivalent_obj(obj
);
4498 unsigned yaffs_get_obj_type(struct yaffs_obj
*obj
)
4500 obj
= yaffs_get_equivalent_obj(obj
);
4502 switch (obj
->variant_type
) {
4503 case YAFFS_OBJECT_TYPE_FILE
:
4506 case YAFFS_OBJECT_TYPE_DIRECTORY
:
4509 case YAFFS_OBJECT_TYPE_SYMLINK
:
4512 case YAFFS_OBJECT_TYPE_HARDLINK
:
4515 case YAFFS_OBJECT_TYPE_SPECIAL
:
4516 if (S_ISFIFO(obj
->yst_mode
))
4518 if (S_ISCHR(obj
->yst_mode
))
4520 if (S_ISBLK(obj
->yst_mode
))
4522 if (S_ISSOCK(obj
->yst_mode
))
4532 YCHAR
*yaffs_get_symlink_alias(struct yaffs_obj
*obj
)
4534 obj
= yaffs_get_equivalent_obj(obj
);
4535 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
)
4536 return yaffs_clone_str(obj
->variant
.symlink_variant
.alias
);
4538 return yaffs_clone_str(_Y(""));
4541 /*--------------------------- Initialisation code -------------------------- */
4543 static int yaffs_check_dev_fns(struct yaffs_dev
*dev
)
4545 struct yaffs_driver
*drv
= &dev
->drv
;
4546 struct yaffs_tags_handler
*tagger
= &dev
->tagger
;
4548 /* Common functions, gotta have */
4549 if (!drv
->drv_read_chunk_fn
||
4550 !drv
->drv_write_chunk_fn
||
4554 if (dev
->param
.is_yaffs2
&&
4555 (!drv
->drv_mark_bad_fn
|| !drv
->drv_check_bad_fn
))
4558 /* Install the default tags marshalling functions if needed. */
4559 yaffs_tags_compat_install(dev
);
4560 yaffs_tags_marshall_install(dev
);
4562 /* Check we now have the marshalling functions required. */
4563 if (!tagger
->write_chunk_tags_fn
||
4564 !tagger
->read_chunk_tags_fn
||
4565 !tagger
->query_block_fn
||
4566 !tagger
->mark_bad_fn
)
4572 static int yaffs_create_initial_dir(struct yaffs_dev
*dev
)
4574 /* Initialise the unlinked, deleted, root and lost+found directories */
4575 dev
->lost_n_found
= dev
->root_dir
= NULL
;
4576 dev
->unlinked_dir
= dev
->del_dir
= NULL
;
4578 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_UNLINKED
, S_IFDIR
);
4580 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_DELETED
, S_IFDIR
);
4582 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_ROOT
,
4583 YAFFS_ROOT_MODE
| S_IFDIR
);
4585 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_LOSTNFOUND
,
4586 YAFFS_LOSTNFOUND_MODE
| S_IFDIR
);
4588 if (dev
->lost_n_found
&& dev
->root_dir
&& dev
->unlinked_dir
4590 yaffs_add_obj_to_dir(dev
->root_dir
, dev
->lost_n_found
);
4597 * Typically only used by yaffs_guts_initialise, but also used by the
4598 * Low level yaffs driver tests.
4601 int yaffs_guts_ll_init(struct yaffs_dev
*dev
)
4605 yaffs_trace(YAFFS_TRACE_TRACING
, "yaffs: yaffs_ll_init()");
4608 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4609 "yaffs: Need a device"
4617 dev
->internal_start_block
= dev
->param
.start_block
;
4618 dev
->internal_end_block
= dev
->param
.end_block
;
4619 dev
->block_offset
= 0;
4620 dev
->chunk_offset
= 0;
4621 dev
->n_free_chunks
= 0;
4625 if (dev
->param
.start_block
== 0) {
4626 dev
->internal_start_block
= dev
->param
.start_block
+ 1;
4627 dev
->internal_end_block
= dev
->param
.end_block
+ 1;
4628 dev
->block_offset
= 1;
4629 dev
->chunk_offset
= dev
->param
.chunks_per_block
;
4632 /* Check geometry parameters. */
4634 if ((!dev
->param
.inband_tags
&& dev
->param
.is_yaffs2
&&
4635 dev
->param
.total_bytes_per_chunk
< 1024) ||
4636 (!dev
->param
.is_yaffs2
&&
4637 dev
->param
.total_bytes_per_chunk
< 512) ||
4638 (dev
->param
.inband_tags
&& !dev
->param
.is_yaffs2
) ||
4639 dev
->param
.chunks_per_block
< 2 ||
4640 dev
->param
.n_reserved_blocks
< 2 ||
4641 dev
->internal_start_block
<= 0 ||
4642 dev
->internal_end_block
<= 0 ||
4643 dev
->internal_end_block
<=
4644 (dev
->internal_start_block
+ dev
->param
.n_reserved_blocks
+ 2)
4646 /* otherwise it is too small */
4647 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4648 "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4649 dev
->param
.total_bytes_per_chunk
,
4650 dev
->param
.is_yaffs2
? "2" : "",
4651 dev
->param
.inband_tags
);
4655 /* Sort out space for inband tags, if required */
4656 if (dev
->param
.inband_tags
)
4657 dev
->data_bytes_per_chunk
=
4658 dev
->param
.total_bytes_per_chunk
-
4659 sizeof(struct yaffs_packed_tags2_tags_only
);
4661 dev
->data_bytes_per_chunk
= dev
->param
.total_bytes_per_chunk
;
4663 /* Got the right mix of functions? */
4664 if (!yaffs_check_dev_fns(dev
)) {
4665 /* Function missing */
4666 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4667 "device function(s) missing or wrong");
4672 if (yaffs_init_nand(dev
) != YAFFS_OK
) {
4673 yaffs_trace(YAFFS_TRACE_ALWAYS
, "InitialiseNAND failed");
4681 int yaffs_format_dev(struct yaffs_dev
*dev
)
4684 enum yaffs_block_state state
;
4687 if(yaffs_guts_ll_init(dev
) != YAFFS_OK
)
4693 for (i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
4694 yaffs_query_init_block_state(dev
, i
, &state
, &dummy
);
4695 if (state
!= YAFFS_BLOCK_STATE_DEAD
)
4696 yaffs_erase_block(dev
, i
);
4703 int yaffs_guts_initialise(struct yaffs_dev
*dev
)
4705 int init_failed
= 0;
4709 if(yaffs_guts_ll_init(dev
) != YAFFS_OK
)
4712 if (dev
->is_mounted
) {
4713 yaffs_trace(YAFFS_TRACE_ALWAYS
, "device already mounted");
4717 dev
->is_mounted
= 1;
4719 /* OK now calculate a few things for the device */
4722 * Calculate all the chunk size manipulation numbers:
4724 x
= dev
->data_bytes_per_chunk
;
4725 /* We always use dev->chunk_shift and dev->chunk_div */
4726 dev
->chunk_shift
= calc_shifts(x
);
4727 x
>>= dev
->chunk_shift
;
4729 /* We only use chunk mask if chunk_div is 1 */
4730 dev
->chunk_mask
= (1 << dev
->chunk_shift
) - 1;
4733 * Calculate chunk_grp_bits.
4734 * We need to find the next power of 2 > than internal_end_block
4737 x
= dev
->param
.chunks_per_block
* (dev
->internal_end_block
+ 1);
4739 bits
= calc_shifts_ceiling(x
);
4741 /* Set up tnode width if wide tnodes are enabled. */
4742 if (!dev
->param
.wide_tnodes_disabled
) {
4743 /* bits must be even so that we end up with 32-bit words */
4747 dev
->tnode_width
= 16;
4749 dev
->tnode_width
= bits
;
4751 dev
->tnode_width
= 16;
4754 dev
->tnode_mask
= (1 << dev
->tnode_width
) - 1;
4756 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4757 * so if the bitwidth of the
4758 * chunk range we're using is greater than 16 we need
4759 * to figure out chunk shift and chunk_grp_size
4762 if (bits
<= dev
->tnode_width
)
4763 dev
->chunk_grp_bits
= 0;
4765 dev
->chunk_grp_bits
= bits
- dev
->tnode_width
;
4767 dev
->tnode_size
= (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8;
4768 if (dev
->tnode_size
< sizeof(struct yaffs_tnode
))
4769 dev
->tnode_size
= sizeof(struct yaffs_tnode
);
4771 dev
->chunk_grp_size
= 1 << dev
->chunk_grp_bits
;
4773 if (dev
->param
.chunks_per_block
< dev
->chunk_grp_size
) {
4774 /* We have a problem because the soft delete won't work if
4775 * the chunk group size > chunks per block.
4776 * This can be remedied by using larger "virtual blocks".
4778 yaffs_trace(YAFFS_TRACE_ALWAYS
, "chunk group too large");
4783 /* Finished verifying the device, continue with initialisation */
4785 /* More device initialisation */
4787 dev
->passive_gc_count
= 0;
4788 dev
->oldest_dirty_gc_count
= 0;
4790 dev
->gc_block_finder
= 0;
4791 dev
->buffered_block
= -1;
4792 dev
->doing_buffered_block_rewrite
= 0;
4793 dev
->n_deleted_files
= 0;
4794 dev
->n_bg_deletions
= 0;
4795 dev
->n_unlinked_files
= 0;
4796 dev
->n_ecc_fixed
= 0;
4797 dev
->n_ecc_unfixed
= 0;
4798 dev
->n_tags_ecc_fixed
= 0;
4799 dev
->n_tags_ecc_unfixed
= 0;
4800 dev
->n_erase_failures
= 0;
4801 dev
->n_erased_blocks
= 0;
4802 dev
->gc_disable
= 0;
4803 dev
->has_pending_prioritised_gc
= 1;
4804 /* Assume the worst for now, will get fixed on first GC */
4805 INIT_LIST_HEAD(&dev
->dirty_dirs
);
4806 dev
->oldest_dirty_seq
= 0;
4807 dev
->oldest_dirty_block
= 0;
4809 /* Initialise temporary buffers and caches. */
4810 if (!yaffs_init_tmp_buffers(dev
))
4814 dev
->gc_cleanup_list
= NULL
;
4816 if (!init_failed
&& dev
->param
.n_caches
> 0) {
4820 dev
->param
.n_caches
* sizeof(struct yaffs_cache
);
4822 if (dev
->param
.n_caches
> YAFFS_MAX_SHORT_OP_CACHES
)
4823 dev
->param
.n_caches
= YAFFS_MAX_SHORT_OP_CACHES
;
4825 dev
->cache
= kmalloc(cache_bytes
, GFP_NOFS
);
4827 buf
= (u8
*) dev
->cache
;
4830 memset(dev
->cache
, 0, cache_bytes
);
4832 for (i
= 0; i
< dev
->param
.n_caches
&& buf
; i
++) {
4833 dev
->cache
[i
].object
= NULL
;
4834 dev
->cache
[i
].last_use
= 0;
4835 dev
->cache
[i
].dirty
= 0;
4836 dev
->cache
[i
].data
= buf
=
4837 kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
4842 dev
->cache_last_use
= 0;
4845 dev
->cache_hits
= 0;
4848 dev
->gc_cleanup_list
=
4849 kmalloc(dev
->param
.chunks_per_block
* sizeof(u32
),
4851 if (!dev
->gc_cleanup_list
)
4855 if (dev
->param
.is_yaffs2
)
4856 dev
->param
.use_header_file_size
= 1;
4858 if (!init_failed
&& !yaffs_init_blocks(dev
))
4861 yaffs_init_tnodes_and_objs(dev
);
4863 if (!init_failed
&& !yaffs_create_initial_dir(dev
))
4866 if (!init_failed
&& dev
->param
.is_yaffs2
&&
4867 !dev
->param
.disable_summary
&&
4868 !yaffs_summary_init(dev
))
4872 /* Now scan the flash. */
4873 if (dev
->param
.is_yaffs2
) {
4874 if (yaffs2_checkpt_restore(dev
)) {
4875 yaffs_check_obj_details_loaded(dev
->root_dir
);
4876 yaffs_trace(YAFFS_TRACE_CHECKPOINT
|
4878 "yaffs: restored from checkpoint"
4882 /* Clean up the mess caused by an aborted
4883 * checkpoint load then scan backwards.
4885 yaffs_deinit_blocks(dev
);
4887 yaffs_deinit_tnodes_and_objs(dev
);
4889 dev
->n_erased_blocks
= 0;
4890 dev
->n_free_chunks
= 0;
4891 dev
->alloc_block
= -1;
4892 dev
->alloc_page
= -1;
4893 dev
->n_deleted_files
= 0;
4894 dev
->n_unlinked_files
= 0;
4895 dev
->n_bg_deletions
= 0;
4897 if (!init_failed
&& !yaffs_init_blocks(dev
))
4900 yaffs_init_tnodes_and_objs(dev
);
4903 && !yaffs_create_initial_dir(dev
))
4906 if (!init_failed
&& !yaffs2_scan_backwards(dev
))
4909 } else if (!yaffs1_scan(dev
)) {
4913 yaffs_strip_deleted_objs(dev
);
4914 yaffs_fix_hanging_objs(dev
);
4915 if (dev
->param
.empty_lost_n_found
)
4916 yaffs_empty_l_n_f(dev
);
4920 /* Clean up the mess */
4921 yaffs_trace(YAFFS_TRACE_TRACING
,
4922 "yaffs: yaffs_guts_initialise() aborted.");
4924 yaffs_deinitialise(dev
);
4928 /* Zero out stats */
4929 dev
->n_page_reads
= 0;
4930 dev
->n_page_writes
= 0;
4931 dev
->n_erasures
= 0;
4932 dev
->n_gc_copies
= 0;
4933 dev
->n_retried_writes
= 0;
4935 dev
->n_retired_blocks
= 0;
4937 yaffs_verify_free_chunks(dev
);
4938 yaffs_verify_blocks(dev
);
4940 /* Clean up any aborted checkpoint data */
4941 if (!dev
->is_checkpointed
&& dev
->blocks_in_checkpt
> 0)
4942 yaffs2_checkpt_invalidate(dev
);
4944 yaffs_trace(YAFFS_TRACE_TRACING
,
4945 "yaffs: yaffs_guts_initialise() done.");
4949 void yaffs_deinitialise(struct yaffs_dev
*dev
)
4951 if (dev
->is_mounted
) {
4954 yaffs_deinit_blocks(dev
);
4955 yaffs_deinit_tnodes_and_objs(dev
);
4956 yaffs_summary_deinit(dev
);
4958 if (dev
->param
.n_caches
> 0 && dev
->cache
) {
4960 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
4961 kfree(dev
->cache
[i
].data
);
4962 dev
->cache
[i
].data
= NULL
;
4969 kfree(dev
->gc_cleanup_list
);
4971 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++)
4972 kfree(dev
->temp_buffer
[i
].buffer
);
4974 dev
->is_mounted
= 0;
4976 yaffs_deinit_nand(dev
);
4980 int yaffs_count_free_chunks(struct yaffs_dev
*dev
)
4984 struct yaffs_block_info
*blk
;
4986 blk
= dev
->block_info
;
4987 for (b
= dev
->internal_start_block
; b
<= dev
->internal_end_block
; b
++) {
4988 switch (blk
->block_state
) {
4989 case YAFFS_BLOCK_STATE_EMPTY
:
4990 case YAFFS_BLOCK_STATE_ALLOCATING
:
4991 case YAFFS_BLOCK_STATE_COLLECTING
:
4992 case YAFFS_BLOCK_STATE_FULL
:
4994 (dev
->param
.chunks_per_block
- blk
->pages_in_use
+
4995 blk
->soft_del_pages
);
5005 int yaffs_get_n_free_chunks(struct yaffs_dev
*dev
)
5007 /* This is what we report to the outside world */
5010 int blocks_for_checkpt
;
5013 n_free
= dev
->n_free_chunks
;
5014 n_free
+= dev
->n_deleted_files
;
5016 /* Now count and subtract the number of dirty chunks in the cache. */
5018 for (n_dirty_caches
= 0, i
= 0; i
< dev
->param
.n_caches
; i
++) {
5019 if (dev
->cache
[i
].dirty
)
5023 n_free
-= n_dirty_caches
;
5026 ((dev
->param
.n_reserved_blocks
+ 1) * dev
->param
.chunks_per_block
);
5028 /* Now figure checkpoint space and report that... */
5029 blocks_for_checkpt
= yaffs_calc_checkpt_blocks_required(dev
);
5031 n_free
-= (blocks_for_checkpt
* dev
->param
.chunks_per_block
);
5042 * Marshalling functions to get loff_t file sizes into and out of
5045 void yaffs_oh_size_load(struct yaffs_obj_hdr
*oh
, loff_t fsize
)
5047 oh
->file_size_low
= (fsize
& 0xFFFFFFFF);
5048 oh
->file_size_high
= ((fsize
>> 32) & 0xFFFFFFFF);
5051 loff_t
yaffs_oh_to_size(struct yaffs_obj_hdr
*oh
)
5055 if (sizeof(loff_t
) >= 8 && ~(oh
->file_size_high
))
5056 retval
= (((loff_t
) oh
->file_size_high
) << 32) |
5057 (((loff_t
) oh
->file_size_low
) & 0xFFFFFFFF);
5059 retval
= (loff_t
) oh
->file_size_low
;
5065 void yaffs_count_blocks_by_state(struct yaffs_dev
*dev
, int bs
[10])
5068 struct yaffs_block_info
*bi
;
5071 for(i
= 0; i
< 10; i
++)
5074 for(i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
5075 bi
= yaffs_get_block_info(dev
, i
);
5076 s
= bi
->block_state
;
5077 if(s
> YAFFS_BLOCK_STATE_DEAD
|| s
< YAFFS_BLOCK_STATE_UNKNOWN
)