2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 #include "yaffs_trace.h"
17 #include "yaffs_guts.h"
18 #include "yaffs_getblockinfo.h"
19 #include "yaffs_tagscompat.h"
20 #include "yaffs_nand.h"
21 #include "yaffs_yaffs1.h"
22 #include "yaffs_yaffs2.h"
23 #include "yaffs_bitmap.h"
24 #include "yaffs_verify.h"
25 #include "yaffs_nand.h"
26 #include "yaffs_packedtags2.h"
27 #include "yaffs_nameval.h"
28 #include "yaffs_allocator.h"
29 #include "yaffs_attribs.h"
30 #include "yaffs_summary.h"
32 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
33 #define YAFFS_GC_GOOD_ENOUGH 2
34 #define YAFFS_GC_PASSIVE_THRESHOLD 4
36 #include "yaffs_ecc.h"
38 /* Forward declarations */
40 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
41 const u8
*buffer
, int n_bytes
, int use_reserve
);
45 /* Function to calculate chunk and offset */
47 void yaffs_addr_to_chunk(struct yaffs_dev
*dev
, loff_t addr
,
48 int *chunk_out
, u32
*offset_out
)
53 chunk
= (u32
) (addr
>> dev
->chunk_shift
);
55 if (dev
->chunk_div
== 1) {
56 /* easy power of 2 case */
57 offset
= (u32
) (addr
& dev
->chunk_mask
);
59 /* Non power-of-2 case */
63 chunk
/= dev
->chunk_div
;
65 chunk_base
= ((loff_t
) chunk
) * dev
->data_bytes_per_chunk
;
66 offset
= (u32
) (addr
- chunk_base
);
73 /* Function to return the number of shifts for a power of 2 greater than or
74 * equal to the given number
75 * Note we don't try to cater for all possible numbers and this does not have to
76 * be hellishly efficient.
79 static inline u32
calc_shifts_ceiling(u32 x
)
84 shifts
= extra_bits
= 0;
99 /* Function to return the number of shifts to get a 1 in bit 0
102 static inline u32
calc_shifts(u32 x
)
120 * Temporary buffer manipulations.
123 static int yaffs_init_tmp_buffers(struct yaffs_dev
*dev
)
128 memset(dev
->temp_buffer
, 0, sizeof(dev
->temp_buffer
));
130 for (i
= 0; buf
&& i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
131 dev
->temp_buffer
[i
].in_use
= 0;
132 buf
= kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
133 dev
->temp_buffer
[i
].buffer
= buf
;
136 return buf
? YAFFS_OK
: YAFFS_FAIL
;
139 u8
*yaffs_get_temp_buffer(struct yaffs_dev
* dev
)
144 if (dev
->temp_in_use
> dev
->max_temp
)
145 dev
->max_temp
= dev
->temp_in_use
;
147 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
148 if (dev
->temp_buffer
[i
].in_use
== 0) {
149 dev
->temp_buffer
[i
].in_use
= 1;
150 return dev
->temp_buffer
[i
].buffer
;
154 yaffs_trace(YAFFS_TRACE_BUFFERS
, "Out of temp buffers");
156 * If we got here then we have to allocate an unmanaged one
160 dev
->unmanaged_buffer_allocs
++;
161 return kmalloc(dev
->data_bytes_per_chunk
, GFP_NOFS
);
165 void yaffs_release_temp_buffer(struct yaffs_dev
*dev
, u8
*buffer
)
171 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
172 if (dev
->temp_buffer
[i
].buffer
== buffer
) {
173 dev
->temp_buffer
[i
].in_use
= 0;
179 /* assume it is an unmanaged one. */
180 yaffs_trace(YAFFS_TRACE_BUFFERS
,
181 "Releasing unmanaged temp buffer");
183 dev
->unmanaged_buffer_deallocs
++;
189 * Determine if we have a managed buffer.
191 int yaffs_is_managed_tmp_buffer(struct yaffs_dev
*dev
, const u8
*buffer
)
195 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++) {
196 if (dev
->temp_buffer
[i
].buffer
== buffer
)
200 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
201 if (dev
->cache
[i
].data
== buffer
)
205 if (buffer
== dev
->checkpt_buffer
)
208 yaffs_trace(YAFFS_TRACE_ALWAYS
,
209 "yaffs: unmaged buffer detected.");
214 * Functions for robustisizing TODO
218 static void yaffs_handle_chunk_wr_ok(struct yaffs_dev
*dev
, int nand_chunk
,
220 const struct yaffs_ext_tags
*tags
)
223 nand_chunk
= nand_chunk
;
228 static void yaffs_handle_chunk_update(struct yaffs_dev
*dev
, int nand_chunk
,
229 const struct yaffs_ext_tags
*tags
)
232 nand_chunk
= nand_chunk
;
236 void yaffs_handle_chunk_error(struct yaffs_dev
*dev
,
237 struct yaffs_block_info
*bi
)
239 if (!bi
->gc_prioritise
) {
240 bi
->gc_prioritise
= 1;
241 dev
->has_pending_prioritised_gc
= 1;
242 bi
->chunk_error_strikes
++;
244 if (bi
->chunk_error_strikes
> 3) {
245 bi
->needs_retiring
= 1; /* Too many stikes, so retire */
246 yaffs_trace(YAFFS_TRACE_ALWAYS
,
247 "yaffs: Block struck out");
253 static void yaffs_handle_chunk_wr_error(struct yaffs_dev
*dev
, int nand_chunk
,
256 int flash_block
= nand_chunk
/ dev
->param
.chunks_per_block
;
257 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
259 yaffs_handle_chunk_error(dev
, bi
);
262 /* Was an actual write failure,
263 * so mark the block for retirement.*/
264 bi
->needs_retiring
= 1;
265 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
266 "**>> Block %d needs retiring", flash_block
);
269 /* Delete the chunk */
270 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
271 yaffs_skip_rest_of_block(dev
);
279 * Simple hash function. Needs to have a reasonable spread
282 static inline int yaffs_hash_fn(int n
)
286 return n
% YAFFS_NOBJECT_BUCKETS
;
290 * Access functions to useful fake objects.
291 * Note that root might have a presence in NAND if permissions are set.
294 struct yaffs_obj
*yaffs_root(struct yaffs_dev
*dev
)
296 return dev
->root_dir
;
299 struct yaffs_obj
*yaffs_lost_n_found(struct yaffs_dev
*dev
)
301 return dev
->lost_n_found
;
305 * Erased NAND checking functions
308 int yaffs_check_ff(u8
*buffer
, int n_bytes
)
310 /* Horrible, slow implementation */
319 static int yaffs_check_chunk_erased(struct yaffs_dev
*dev
, int nand_chunk
)
321 int retval
= YAFFS_OK
;
322 u8
*data
= yaffs_get_temp_buffer(dev
);
323 struct yaffs_ext_tags tags
;
325 yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, data
, &tags
);
327 if (tags
.ecc_result
> YAFFS_ECC_RESULT_NO_ERROR
)
330 if (!yaffs_check_ff(data
, dev
->data_bytes_per_chunk
) ||
332 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
333 "Chunk %d not erased", nand_chunk
);
337 yaffs_release_temp_buffer(dev
, data
);
343 static int yaffs_verify_chunk_written(struct yaffs_dev
*dev
,
346 struct yaffs_ext_tags
*tags
)
348 int retval
= YAFFS_OK
;
349 struct yaffs_ext_tags temp_tags
;
350 u8
*buffer
= yaffs_get_temp_buffer(dev
);
352 yaffs_rd_chunk_tags_nand(dev
, nand_chunk
, buffer
, &temp_tags
);
353 if (memcmp(buffer
, data
, dev
->data_bytes_per_chunk
) ||
354 temp_tags
.obj_id
!= tags
->obj_id
||
355 temp_tags
.chunk_id
!= tags
->chunk_id
||
356 temp_tags
.n_bytes
!= tags
->n_bytes
)
359 yaffs_release_temp_buffer(dev
, buffer
);
365 int yaffs_check_alloc_available(struct yaffs_dev
*dev
, int n_chunks
)
368 int reserved_blocks
= dev
->param
.n_reserved_blocks
;
371 checkpt_blocks
= yaffs_calc_checkpt_blocks_required(dev
);
374 (reserved_blocks
+ checkpt_blocks
) * dev
->param
.chunks_per_block
;
376 return (dev
->n_free_chunks
> (reserved_chunks
+ n_chunks
));
379 static int yaffs_find_alloc_block(struct yaffs_dev
*dev
)
382 struct yaffs_block_info
*bi
;
384 if (dev
->n_erased_blocks
< 1) {
385 /* Hoosterman we've got a problem.
386 * Can't get space to gc
388 yaffs_trace(YAFFS_TRACE_ERROR
,
389 "yaffs tragedy: no more erased blocks");
394 /* Find an empty block. */
396 for (i
= dev
->internal_start_block
; i
<= dev
->internal_end_block
; i
++) {
397 dev
->alloc_block_finder
++;
398 if (dev
->alloc_block_finder
< dev
->internal_start_block
399 || dev
->alloc_block_finder
> dev
->internal_end_block
) {
400 dev
->alloc_block_finder
= dev
->internal_start_block
;
403 bi
= yaffs_get_block_info(dev
, dev
->alloc_block_finder
);
405 if (bi
->block_state
== YAFFS_BLOCK_STATE_EMPTY
) {
406 bi
->block_state
= YAFFS_BLOCK_STATE_ALLOCATING
;
408 bi
->seq_number
= dev
->seq_number
;
409 dev
->n_erased_blocks
--;
410 yaffs_trace(YAFFS_TRACE_ALLOCATE
,
411 "Allocated block %d, seq %d, %d left" ,
412 dev
->alloc_block_finder
, dev
->seq_number
,
413 dev
->n_erased_blocks
);
414 return dev
->alloc_block_finder
;
418 yaffs_trace(YAFFS_TRACE_ALWAYS
,
419 "yaffs tragedy: no more erased blocks, but there should have been %d",
420 dev
->n_erased_blocks
);
425 static int yaffs_alloc_chunk(struct yaffs_dev
*dev
, int use_reserver
,
426 struct yaffs_block_info
**block_ptr
)
429 struct yaffs_block_info
*bi
;
431 if (dev
->alloc_block
< 0) {
432 /* Get next block to allocate off */
433 dev
->alloc_block
= yaffs_find_alloc_block(dev
);
437 if (!use_reserver
&& !yaffs_check_alloc_available(dev
, 1)) {
438 /* No space unless we're allowed to use the reserve. */
442 if (dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
443 && dev
->alloc_page
== 0)
444 yaffs_trace(YAFFS_TRACE_ALLOCATE
, "Allocating reserve");
446 /* Next page please.... */
447 if (dev
->alloc_block
>= 0) {
448 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
450 ret_val
= (dev
->alloc_block
* dev
->param
.chunks_per_block
) +
453 yaffs_set_chunk_bit(dev
, dev
->alloc_block
, dev
->alloc_page
);
457 dev
->n_free_chunks
--;
459 /* If the block is full set the state to full */
460 if (dev
->alloc_page
>= dev
->param
.chunks_per_block
) {
461 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
462 dev
->alloc_block
= -1;
471 yaffs_trace(YAFFS_TRACE_ERROR
,
472 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
477 static int yaffs_get_erased_chunks(struct yaffs_dev
*dev
)
481 n
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
483 if (dev
->alloc_block
> 0)
484 n
+= (dev
->param
.chunks_per_block
- dev
->alloc_page
);
491 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
492 * if we don't want to write to it.
494 void yaffs_skip_rest_of_block(struct yaffs_dev
*dev
)
496 struct yaffs_block_info
*bi
;
498 if (dev
->alloc_block
> 0) {
499 bi
= yaffs_get_block_info(dev
, dev
->alloc_block
);
500 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
) {
501 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
502 dev
->alloc_block
= -1;
507 static int yaffs_write_new_chunk(struct yaffs_dev
*dev
,
509 struct yaffs_ext_tags
*tags
, int use_reserver
)
515 yaffs2_checkpt_invalidate(dev
);
518 struct yaffs_block_info
*bi
= 0;
521 chunk
= yaffs_alloc_chunk(dev
, use_reserver
, &bi
);
527 /* First check this chunk is erased, if it needs
528 * checking. The checking policy (unless forced
529 * always on) is as follows:
531 * Check the first page we try to write in a block.
532 * If the check passes then we don't need to check any
533 * more. If the check fails, we check again...
534 * If the block has been erased, we don't need to check.
536 * However, if the block has been prioritised for gc,
537 * then we think there might be something odd about
538 * this block and stop using it.
540 * Rationale: We should only ever see chunks that have
541 * not been erased if there was a partially written
542 * chunk due to power loss. This checking policy should
543 * catch that case with very few checks and thus save a
544 * lot of checks that are most likely not needed.
547 * If an erase check fails or the write fails we skip the
551 /* let's give it a try */
554 if (dev
->param
.always_check_erased
)
555 bi
->skip_erased_check
= 0;
557 if (!bi
->skip_erased_check
) {
558 erased_ok
= yaffs_check_chunk_erased(dev
, chunk
);
559 if (erased_ok
!= YAFFS_OK
) {
560 yaffs_trace(YAFFS_TRACE_ERROR
,
561 "**>> yaffs chunk %d was not erased",
564 /* If not erased, delete this one,
565 * skip rest of block and
566 * try another chunk */
567 yaffs_chunk_del(dev
, chunk
, 1, __LINE__
);
568 yaffs_skip_rest_of_block(dev
);
573 write_ok
= yaffs_wr_chunk_tags_nand(dev
, chunk
, data
, tags
);
575 if (!bi
->skip_erased_check
)
577 yaffs_verify_chunk_written(dev
, chunk
, data
, tags
);
579 if (write_ok
!= YAFFS_OK
) {
580 /* Clean up aborted write, skip to next block and
581 * try another chunk */
582 yaffs_handle_chunk_wr_error(dev
, chunk
, erased_ok
);
586 bi
->skip_erased_check
= 1;
588 /* Copy the data into the robustification buffer */
589 yaffs_handle_chunk_wr_ok(dev
, chunk
, data
, tags
);
591 } while (write_ok
!= YAFFS_OK
&&
592 (yaffs_wr_attempts
<= 0 || attempts
<= yaffs_wr_attempts
));
598 yaffs_trace(YAFFS_TRACE_ERROR
,
599 "**>> yaffs write required %d attempts",
601 dev
->n_retried_writes
+= (attempts
- 1);
608 * Block retiring for handling a broken block.
611 static void yaffs_retire_block(struct yaffs_dev
*dev
, int flash_block
)
613 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, flash_block
);
615 yaffs2_checkpt_invalidate(dev
);
617 yaffs2_clear_oldest_dirty_seq(dev
, bi
);
619 if (yaffs_mark_bad(dev
, flash_block
) != YAFFS_OK
) {
620 if (yaffs_erase_block(dev
, flash_block
) != YAFFS_OK
) {
621 yaffs_trace(YAFFS_TRACE_ALWAYS
,
622 "yaffs: Failed to mark bad and erase block %d",
625 struct yaffs_ext_tags tags
;
627 flash_block
* dev
->param
.chunks_per_block
;
629 u8
*buffer
= yaffs_get_temp_buffer(dev
);
631 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
632 memset(&tags
, 0, sizeof(tags
));
633 tags
.seq_number
= YAFFS_SEQUENCE_BAD_BLOCK
;
634 if (dev
->param
.write_chunk_tags_fn(dev
, chunk_id
-
638 yaffs_trace(YAFFS_TRACE_ALWAYS
,
639 "yaffs: Failed to write bad block marker to block %d",
642 yaffs_release_temp_buffer(dev
, buffer
);
646 bi
->block_state
= YAFFS_BLOCK_STATE_DEAD
;
647 bi
->gc_prioritise
= 0;
648 bi
->needs_retiring
= 0;
650 dev
->n_retired_blocks
++;
653 /*---------------- Name handling functions ------------*/
655 static u16
yaffs_calc_name_sum(const YCHAR
*name
)
663 while ((*name
) && i
< (YAFFS_MAX_NAME_LENGTH
/ 2)) {
665 /* 0x1f mask is case insensitive */
666 sum
+= ((*name
) & 0x1f) * i
;
673 void yaffs_set_obj_name(struct yaffs_obj
*obj
, const YCHAR
* name
)
675 memset(obj
->short_name
, 0, sizeof(obj
->short_name
));
677 yaffs_strnlen(name
, YAFFS_SHORT_NAME_LENGTH
+ 1) <=
678 YAFFS_SHORT_NAME_LENGTH
)
679 yaffs_strcpy(obj
->short_name
, name
);
681 obj
->short_name
[0] = _Y('\0');
682 obj
->sum
= yaffs_calc_name_sum(name
);
685 void yaffs_set_obj_name_from_oh(struct yaffs_obj
*obj
,
686 const struct yaffs_obj_hdr
*oh
)
688 #ifdef CONFIG_YAFFS_AUTO_UNICODE
689 YCHAR tmp_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
690 memset(tmp_name
, 0, sizeof(tmp_name
));
691 yaffs_load_name_from_oh(obj
->my_dev
, tmp_name
, oh
->name
,
692 YAFFS_MAX_NAME_LENGTH
+ 1);
693 yaffs_set_obj_name(obj
, tmp_name
);
695 yaffs_set_obj_name(obj
, oh
->name
);
699 loff_t
yaffs_max_file_size(struct yaffs_dev
*dev
)
701 return ((loff_t
) YAFFS_MAX_CHUNK_ID
) * dev
->data_bytes_per_chunk
;
704 /*-------------------- TNODES -------------------
706 * List of spare tnodes
707 * The list is hooked together using the first pointer
711 struct yaffs_tnode
*yaffs_get_tnode(struct yaffs_dev
*dev
)
713 struct yaffs_tnode
*tn
= yaffs_alloc_raw_tnode(dev
);
716 memset(tn
, 0, dev
->tnode_size
);
720 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
725 /* FreeTnode frees up a tnode and puts it back on the free list */
726 static void yaffs_free_tnode(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
)
728 yaffs_free_raw_tnode(dev
, tn
);
730 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
733 static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev
*dev
)
735 yaffs_deinit_raw_tnodes_and_objs(dev
);
740 void yaffs_load_tnode_0(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
741 unsigned pos
, unsigned val
)
743 u32
*map
= (u32
*) tn
;
749 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
750 val
>>= dev
->chunk_grp_bits
;
752 bit_in_map
= pos
* dev
->tnode_width
;
753 word_in_map
= bit_in_map
/ 32;
754 bit_in_word
= bit_in_map
& (32 - 1);
756 mask
= dev
->tnode_mask
<< bit_in_word
;
758 map
[word_in_map
] &= ~mask
;
759 map
[word_in_map
] |= (mask
& (val
<< bit_in_word
));
761 if (dev
->tnode_width
> (32 - bit_in_word
)) {
762 bit_in_word
= (32 - bit_in_word
);
765 dev
->tnode_mask
>> bit_in_word
;
766 map
[word_in_map
] &= ~mask
;
767 map
[word_in_map
] |= (mask
& (val
>> bit_in_word
));
771 u32
yaffs_get_group_base(struct yaffs_dev
*dev
, struct yaffs_tnode
*tn
,
774 u32
*map
= (u32
*) tn
;
780 pos
&= YAFFS_TNODES_LEVEL0_MASK
;
782 bit_in_map
= pos
* dev
->tnode_width
;
783 word_in_map
= bit_in_map
/ 32;
784 bit_in_word
= bit_in_map
& (32 - 1);
786 val
= map
[word_in_map
] >> bit_in_word
;
788 if (dev
->tnode_width
> (32 - bit_in_word
)) {
789 bit_in_word
= (32 - bit_in_word
);
791 val
|= (map
[word_in_map
] << bit_in_word
);
794 val
&= dev
->tnode_mask
;
795 val
<<= dev
->chunk_grp_bits
;
800 /* ------------------- End of individual tnode manipulation -----------------*/
802 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
803 * The look up tree is represented by the top tnode and the number of top_level
804 * in the tree. 0 means only the level 0 tnode is in the tree.
807 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
808 struct yaffs_tnode
*yaffs_find_tnode_0(struct yaffs_dev
*dev
,
809 struct yaffs_file_var
*file_struct
,
812 struct yaffs_tnode
*tn
= file_struct
->top
;
815 int level
= file_struct
->top_level
;
819 /* Check sane level and chunk Id */
820 if (level
< 0 || level
> YAFFS_TNODES_MAX_LEVEL
)
823 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
826 /* First check we're tall enough (ie enough top_level) */
828 i
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
831 i
>>= YAFFS_TNODES_INTERNAL_BITS
;
835 if (required_depth
> file_struct
->top_level
)
836 return NULL
; /* Not tall enough, so we can't find it */
838 /* Traverse down to level 0 */
839 while (level
> 0 && tn
) {
840 tn
= tn
->internal
[(chunk_id
>>
841 (YAFFS_TNODES_LEVEL0_BITS
+
843 YAFFS_TNODES_INTERNAL_BITS
)) &
844 YAFFS_TNODES_INTERNAL_MASK
];
851 /* add_find_tnode_0 finds the level 0 tnode if it exists,
852 * otherwise first expands the tree.
853 * This happens in two steps:
854 * 1. If the tree isn't tall enough, then make it taller.
855 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
857 * Used when modifying the tree.
859 * If the tn argument is NULL, then a fresh tnode will be added otherwise the
860 * specified tn will be plugged into the ttree.
863 struct yaffs_tnode
*yaffs_add_find_tnode_0(struct yaffs_dev
*dev
,
864 struct yaffs_file_var
*file_struct
,
866 struct yaffs_tnode
*passed_tn
)
871 struct yaffs_tnode
*tn
;
874 /* Check sane level and page Id */
875 if (file_struct
->top_level
< 0 ||
876 file_struct
->top_level
> YAFFS_TNODES_MAX_LEVEL
)
879 if (chunk_id
> YAFFS_MAX_CHUNK_ID
)
882 /* First check we're tall enough (ie enough top_level) */
884 x
= chunk_id
>> YAFFS_TNODES_LEVEL0_BITS
;
887 x
>>= YAFFS_TNODES_INTERNAL_BITS
;
891 if (required_depth
> file_struct
->top_level
) {
892 /* Not tall enough, gotta make the tree taller */
893 for (i
= file_struct
->top_level
; i
< required_depth
; i
++) {
895 tn
= yaffs_get_tnode(dev
);
898 tn
->internal
[0] = file_struct
->top
;
899 file_struct
->top
= tn
;
900 file_struct
->top_level
++;
902 yaffs_trace(YAFFS_TRACE_ERROR
,
903 "yaffs: no more tnodes");
909 /* Traverse down to level 0, adding anything we need */
911 l
= file_struct
->top_level
;
912 tn
= file_struct
->top
;
915 while (l
> 0 && tn
) {
917 (YAFFS_TNODES_LEVEL0_BITS
+
918 (l
- 1) * YAFFS_TNODES_INTERNAL_BITS
)) &
919 YAFFS_TNODES_INTERNAL_MASK
;
921 if ((l
> 1) && !tn
->internal
[x
]) {
922 /* Add missing non-level-zero tnode */
923 tn
->internal
[x
] = yaffs_get_tnode(dev
);
924 if (!tn
->internal
[x
])
927 /* Looking from level 1 at level 0 */
929 /* If we already have one, release it */
931 yaffs_free_tnode(dev
,
933 tn
->internal
[x
] = passed_tn
;
935 } else if (!tn
->internal
[x
]) {
936 /* Don't have one, none passed in */
937 tn
->internal
[x
] = yaffs_get_tnode(dev
);
938 if (!tn
->internal
[x
])
943 tn
= tn
->internal
[x
];
949 memcpy(tn
, passed_tn
,
950 (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8);
951 yaffs_free_tnode(dev
, passed_tn
);
958 static int yaffs_tags_match(const struct yaffs_ext_tags
*tags
, int obj_id
,
961 return (tags
->chunk_id
== chunk_obj
&&
962 tags
->obj_id
== obj_id
&&
963 !tags
->is_deleted
) ? 1 : 0;
967 static int yaffs_find_chunk_in_group(struct yaffs_dev
*dev
, int the_chunk
,
968 struct yaffs_ext_tags
*tags
, int obj_id
,
973 for (j
= 0; the_chunk
&& j
< dev
->chunk_grp_size
; j
++) {
974 if (yaffs_check_chunk_bit
975 (dev
, the_chunk
/ dev
->param
.chunks_per_block
,
976 the_chunk
% dev
->param
.chunks_per_block
)) {
978 if (dev
->chunk_grp_size
== 1)
981 yaffs_rd_chunk_tags_nand(dev
, the_chunk
, NULL
,
983 if (yaffs_tags_match(tags
,
984 obj_id
, inode_chunk
)) {
995 static int yaffs_find_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
996 struct yaffs_ext_tags
*tags
)
998 /*Get the Tnode, then get the level 0 offset chunk offset */
999 struct yaffs_tnode
*tn
;
1001 struct yaffs_ext_tags local_tags
;
1003 struct yaffs_dev
*dev
= in
->my_dev
;
1006 /* Passed a NULL, so use our own tags space */
1010 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1015 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1017 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1022 static int yaffs_find_del_file_chunk(struct yaffs_obj
*in
, int inode_chunk
,
1023 struct yaffs_ext_tags
*tags
)
1025 /* Get the Tnode, then get the level 0 offset chunk offset */
1026 struct yaffs_tnode
*tn
;
1028 struct yaffs_ext_tags local_tags
;
1029 struct yaffs_dev
*dev
= in
->my_dev
;
1033 /* Passed a NULL, so use our own tags space */
1037 tn
= yaffs_find_tnode_0(dev
, &in
->variant
.file_variant
, inode_chunk
);
1042 the_chunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1044 ret_val
= yaffs_find_chunk_in_group(dev
, the_chunk
, tags
, in
->obj_id
,
1047 /* Delete the entry in the filestructure (if found) */
1049 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, 0);
1054 int yaffs_put_chunk_in_file(struct yaffs_obj
*in
, int inode_chunk
,
1055 int nand_chunk
, int in_scan
)
1057 /* NB in_scan is zero unless scanning.
1058 * For forward scanning, in_scan is > 0;
1059 * for backward scanning in_scan is < 0
1061 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1064 struct yaffs_tnode
*tn
;
1065 struct yaffs_dev
*dev
= in
->my_dev
;
1067 struct yaffs_ext_tags existing_tags
;
1068 struct yaffs_ext_tags new_tags
;
1069 unsigned existing_serial
, new_serial
;
1071 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
) {
1072 /* Just ignore an attempt at putting a chunk into a non-file
1074 * If it is not during Scanning then something went wrong!
1077 yaffs_trace(YAFFS_TRACE_ERROR
,
1078 "yaffs tragedy:attempt to put data chunk into a non-file"
1083 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1087 tn
= yaffs_add_find_tnode_0(dev
,
1088 &in
->variant
.file_variant
,
1094 /* Dummy insert, bail now */
1097 existing_cunk
= yaffs_get_group_base(dev
, tn
, inode_chunk
);
1100 /* If we're scanning then we need to test for duplicates
1101 * NB This does not need to be efficient since it should only
1102 * happen when the power fails during a write, then only one
1103 * chunk should ever be affected.
1105 * Correction for YAFFS2: This could happen quite a lot and we
1106 * need to think about efficiency! TODO
1107 * Update: For backward scanning we don't need to re-read tags
1108 * so this is quite cheap.
1111 if (existing_cunk
> 0) {
1112 /* NB Right now existing chunk will not be real
1113 * chunk_id if the chunk group size > 1
1114 * thus we have to do a FindChunkInFile to get the
1117 * We have a duplicate now we need to decide which
1120 * Backwards scanning YAFFS2: The old one is what
1121 * we use, dump the new one.
1122 * YAFFS1: Get both sets of tags and compare serial
1127 /* Only do this for forward scanning */
1128 yaffs_rd_chunk_tags_nand(dev
,
1132 /* Do a proper find */
1134 yaffs_find_chunk_in_file(in
, inode_chunk
,
1138 if (existing_cunk
<= 0) {
1139 /*Hoosterman - how did this happen? */
1141 yaffs_trace(YAFFS_TRACE_ERROR
,
1142 "yaffs tragedy: existing chunk < 0 in scan"
1147 /* NB The deleted flags should be false, otherwise
1148 * the chunks will not be loaded during a scan
1152 new_serial
= new_tags
.serial_number
;
1153 existing_serial
= existing_tags
.serial_number
;
1156 if ((in_scan
> 0) &&
1157 (existing_cunk
<= 0 ||
1158 ((existing_serial
+ 1) & 3) == new_serial
)) {
1159 /* Forward scanning.
1161 * Delete the old one and drop through to
1164 yaffs_chunk_del(dev
, existing_cunk
, 1,
1167 /* Backward scanning or we want to use the
1169 * Delete the new one and return early so that
1170 * the tnode isn't changed
1172 yaffs_chunk_del(dev
, nand_chunk
, 1, __LINE__
);
1179 if (existing_cunk
== 0)
1180 in
->n_data_chunks
++;
1182 yaffs_load_tnode_0(dev
, tn
, inode_chunk
, nand_chunk
);
1187 static void yaffs_soft_del_chunk(struct yaffs_dev
*dev
, int chunk
)
1189 struct yaffs_block_info
*the_block
;
1192 yaffs_trace(YAFFS_TRACE_DELETION
, "soft delete chunk %d", chunk
);
1194 block_no
= chunk
/ dev
->param
.chunks_per_block
;
1195 the_block
= yaffs_get_block_info(dev
, block_no
);
1197 the_block
->soft_del_pages
++;
1198 dev
->n_free_chunks
++;
1199 yaffs2_update_oldest_dirty_seq(dev
, block_no
, the_block
);
1203 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1204 * the chunks in the file.
1205 * All soft deleting does is increment the block's softdelete count and pulls
1206 * the chunk out of the tnode.
1207 * Thus, essentially this is the same as DeleteWorker except that the chunks
1211 static int yaffs_soft_del_worker(struct yaffs_obj
*in
, struct yaffs_tnode
*tn
,
1212 u32 level
, int chunk_offset
)
1217 struct yaffs_dev
*dev
= in
->my_dev
;
1223 for (i
= YAFFS_NTNODES_INTERNAL
- 1;
1226 if (tn
->internal
[i
]) {
1228 yaffs_soft_del_worker(in
,
1232 YAFFS_TNODES_INTERNAL_BITS
)
1235 yaffs_free_tnode(dev
,
1237 tn
->internal
[i
] = NULL
;
1239 /* Can this happen? */
1243 return (all_done
) ? 1 : 0;
1247 for (i
= YAFFS_NTNODES_LEVEL0
- 1; i
>= 0; i
--) {
1248 the_chunk
= yaffs_get_group_base(dev
, tn
, i
);
1250 yaffs_soft_del_chunk(dev
, the_chunk
);
1251 yaffs_load_tnode_0(dev
, tn
, i
, 0);
1257 static void yaffs_remove_obj_from_dir(struct yaffs_obj
*obj
)
1259 struct yaffs_dev
*dev
= obj
->my_dev
;
1260 struct yaffs_obj
*parent
;
1262 yaffs_verify_obj_in_dir(obj
);
1263 parent
= obj
->parent
;
1265 yaffs_verify_dir(parent
);
1267 if (dev
&& dev
->param
.remove_obj_fn
)
1268 dev
->param
.remove_obj_fn(obj
);
1270 list_del_init(&obj
->siblings
);
1273 yaffs_verify_dir(parent
);
1276 void yaffs_add_obj_to_dir(struct yaffs_obj
*directory
, struct yaffs_obj
*obj
)
1279 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1280 "tragedy: Trying to add an object to a null pointer directory"
1285 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1286 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1287 "tragedy: Trying to add an object to a non-directory"
1292 if (obj
->siblings
.prev
== NULL
) {
1293 /* Not initialised */
1297 yaffs_verify_dir(directory
);
1299 yaffs_remove_obj_from_dir(obj
);
1302 list_add(&obj
->siblings
, &directory
->variant
.dir_variant
.children
);
1303 obj
->parent
= directory
;
1305 if (directory
== obj
->my_dev
->unlinked_dir
1306 || directory
== obj
->my_dev
->del_dir
) {
1308 obj
->my_dev
->n_unlinked_files
++;
1309 obj
->rename_allowed
= 0;
1312 yaffs_verify_dir(directory
);
1313 yaffs_verify_obj_in_dir(obj
);
1316 static int yaffs_change_obj_name(struct yaffs_obj
*obj
,
1317 struct yaffs_obj
*new_dir
,
1318 const YCHAR
*new_name
, int force
, int shadows
)
1322 struct yaffs_obj
*existing_target
;
1324 if (new_dir
== NULL
)
1325 new_dir
= obj
->parent
; /* use the old directory */
1327 if (new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
1328 yaffs_trace(YAFFS_TRACE_ALWAYS
,
1329 "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1334 unlink_op
= (new_dir
== obj
->my_dev
->unlinked_dir
);
1335 del_op
= (new_dir
== obj
->my_dev
->del_dir
);
1337 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
1339 /* If the object is a file going into the unlinked directory,
1340 * then it is OK to just stuff it in since duplicate names are OK.
1341 * else only proceed if the new name does not exist and we're putting
1342 * it into a directory.
1344 if (!(unlink_op
|| del_op
|| force
||
1345 shadows
> 0 || !existing_target
) ||
1346 new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
1349 yaffs_set_obj_name(obj
, new_name
);
1351 yaffs_add_obj_to_dir(new_dir
, obj
);
1356 /* If it is a deletion then we mark it as a shrink for gc */
1357 if (yaffs_update_oh(obj
, new_name
, 0, del_op
, shadows
, NULL
) >= 0)
1363 /*------------------------ Short Operations Cache ------------------------------
1364 * In many situations where there is no high level buffering a lot of
1365 * reads might be short sequential reads, and a lot of writes may be short
1366 * sequential writes. eg. scanning/writing a jpeg file.
1367 * In these cases, a short read/write cache can provide a huge perfomance
1368 * benefit with dumb-as-a-rock code.
1369 * In Linux, the page cache provides read buffering and the short op cache
1370 * provides write buffering.
1372 * There are a small number (~10) of cache chunks per device so that we don't
1373 * need a very intelligent search.
1376 static int yaffs_obj_cache_dirty(struct yaffs_obj
*obj
)
1378 struct yaffs_dev
*dev
= obj
->my_dev
;
1380 struct yaffs_cache
*cache
;
1381 int n_caches
= obj
->my_dev
->param
.n_caches
;
1383 for (i
= 0; i
< n_caches
; i
++) {
1384 cache
= &dev
->cache
[i
];
1385 if (cache
->object
== obj
&& cache
->dirty
)
1392 static void yaffs_flush_file_cache(struct yaffs_obj
*obj
)
1394 struct yaffs_dev
*dev
= obj
->my_dev
;
1395 int lowest
= -99; /* Stop compiler whining. */
1397 struct yaffs_cache
*cache
;
1398 int chunk_written
= 0;
1399 int n_caches
= obj
->my_dev
->param
.n_caches
;
1406 /* Find the lowest dirty chunk for this object */
1407 for (i
= 0; i
< n_caches
; i
++) {
1408 if (dev
->cache
[i
].object
== obj
&&
1409 dev
->cache
[i
].dirty
) {
1411 dev
->cache
[i
].chunk_id
< lowest
) {
1412 cache
= &dev
->cache
[i
];
1413 lowest
= cache
->chunk_id
;
1418 if (cache
&& !cache
->locked
) {
1419 /* Write it out and free it up */
1421 yaffs_wr_data_obj(cache
->object
,
1426 cache
->object
= NULL
;
1428 } while (cache
&& chunk_written
> 0);
1431 /* Hoosterman, disk full while writing cache out. */
1432 yaffs_trace(YAFFS_TRACE_ERROR
,
1433 "yaffs tragedy: no space during cache write");
1436 /*yaffs_flush_whole_cache(dev)
1441 void yaffs_flush_whole_cache(struct yaffs_dev
*dev
)
1443 struct yaffs_obj
*obj
;
1444 int n_caches
= dev
->param
.n_caches
;
1447 /* Find a dirty object in the cache and flush it...
1448 * until there are no further dirty objects.
1452 for (i
= 0; i
< n_caches
&& !obj
; i
++) {
1453 if (dev
->cache
[i
].object
&& dev
->cache
[i
].dirty
)
1454 obj
= dev
->cache
[i
].object
;
1457 yaffs_flush_file_cache(obj
);
1462 /* Grab us a cache chunk for use.
1463 * First look for an empty one.
1464 * Then look for the least recently used non-dirty one.
1465 * Then look for the least recently used dirty one...., flush and look again.
1467 static struct yaffs_cache
*yaffs_grab_chunk_worker(struct yaffs_dev
*dev
)
1471 if (dev
->param
.n_caches
> 0) {
1472 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1473 if (!dev
->cache
[i
].object
)
1474 return &dev
->cache
[i
];
1480 static struct yaffs_cache
*yaffs_grab_chunk_cache(struct yaffs_dev
*dev
)
1482 struct yaffs_cache
*cache
;
1483 struct yaffs_obj
*the_obj
;
1487 if (dev
->param
.n_caches
< 1)
1490 /* Try find a non-dirty one... */
1492 cache
= yaffs_grab_chunk_worker(dev
);
1495 /* They were all dirty, find the LRU object and flush
1496 * its cache, then find again.
1497 * NB what's here is not very accurate,
1498 * we actually flush the object with the LRU chunk.
1501 /* With locking we can't assume we can use entry zero,
1502 * Set the_obj to a valid pointer for Coverity. */
1503 the_obj
= dev
->cache
[0].object
;
1507 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1508 if (dev
->cache
[i
].object
&&
1509 !dev
->cache
[i
].locked
&&
1510 (dev
->cache
[i
].last_use
< usage
||
1512 usage
= dev
->cache
[i
].last_use
;
1513 the_obj
= dev
->cache
[i
].object
;
1514 cache
= &dev
->cache
[i
];
1518 if (!cache
|| cache
->dirty
) {
1519 /* Flush and try again */
1520 yaffs_flush_file_cache(the_obj
);
1521 cache
= yaffs_grab_chunk_worker(dev
);
1527 /* Find a cached chunk */
1528 static struct yaffs_cache
*yaffs_find_chunk_cache(const struct yaffs_obj
*obj
,
1531 struct yaffs_dev
*dev
= obj
->my_dev
;
1534 if (dev
->param
.n_caches
< 1)
1537 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1538 if (dev
->cache
[i
].object
== obj
&&
1539 dev
->cache
[i
].chunk_id
== chunk_id
) {
1542 return &dev
->cache
[i
];
1548 /* Mark the chunk for the least recently used algorithym */
1549 static void yaffs_use_cache(struct yaffs_dev
*dev
, struct yaffs_cache
*cache
,
1554 if (dev
->param
.n_caches
< 1)
1557 if (dev
->cache_last_use
< 0 ||
1558 dev
->cache_last_use
> 100000000) {
1559 /* Reset the cache usages */
1560 for (i
= 1; i
< dev
->param
.n_caches
; i
++)
1561 dev
->cache
[i
].last_use
= 0;
1563 dev
->cache_last_use
= 0;
1565 dev
->cache_last_use
++;
1566 cache
->last_use
= dev
->cache_last_use
;
1572 /* Invalidate a single cache page.
1573 * Do this when a whole page gets written,
1574 * ie the short cache for this page is no longer valid.
1576 static void yaffs_invalidate_chunk_cache(struct yaffs_obj
*object
, int chunk_id
)
1578 struct yaffs_cache
*cache
;
1580 if (object
->my_dev
->param
.n_caches
> 0) {
1581 cache
= yaffs_find_chunk_cache(object
, chunk_id
);
1584 cache
->object
= NULL
;
1588 /* Invalidate all the cache pages associated with this object
1589 * Do this whenever ther file is deleted or resized.
1591 static void yaffs_invalidate_whole_cache(struct yaffs_obj
*in
)
1594 struct yaffs_dev
*dev
= in
->my_dev
;
1596 if (dev
->param
.n_caches
> 0) {
1597 /* Invalidate it. */
1598 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
1599 if (dev
->cache
[i
].object
== in
)
1600 dev
->cache
[i
].object
= NULL
;
1605 static void yaffs_unhash_obj(struct yaffs_obj
*obj
)
1608 struct yaffs_dev
*dev
= obj
->my_dev
;
1610 /* If it is still linked into the bucket list, free from the list */
1611 if (!list_empty(&obj
->hash_link
)) {
1612 list_del_init(&obj
->hash_link
);
1613 bucket
= yaffs_hash_fn(obj
->obj_id
);
1614 dev
->obj_bucket
[bucket
].count
--;
1618 /* FreeObject frees up a Object and puts it back on the free list */
1619 static void yaffs_free_obj(struct yaffs_obj
*obj
)
1621 struct yaffs_dev
*dev
;
1628 yaffs_trace(YAFFS_TRACE_OS
, "FreeObject %p inode %p",
1629 obj
, obj
->my_inode
);
1632 if (!list_empty(&obj
->siblings
))
1635 if (obj
->my_inode
) {
1636 /* We're still hooked up to a cached inode.
1637 * Don't delete now, but mark for later deletion
1639 obj
->defered_free
= 1;
1643 yaffs_unhash_obj(obj
);
1645 yaffs_free_raw_obj(dev
, obj
);
1647 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
1650 void yaffs_handle_defered_free(struct yaffs_obj
*obj
)
1652 if (obj
->defered_free
)
1653 yaffs_free_obj(obj
);
1656 static int yaffs_generic_obj_del(struct yaffs_obj
*in
)
1658 /* Iinvalidate the file's data in the cache, without flushing. */
1659 yaffs_invalidate_whole_cache(in
);
1661 if (in
->my_dev
->param
.is_yaffs2
&& in
->parent
!= in
->my_dev
->del_dir
) {
1662 /* Move to unlinked directory so we have a deletion record */
1663 yaffs_change_obj_name(in
, in
->my_dev
->del_dir
, _Y("deleted"), 0,
1667 yaffs_remove_obj_from_dir(in
);
1668 yaffs_chunk_del(in
->my_dev
, in
->hdr_chunk
, 1, __LINE__
);
1676 static void yaffs_soft_del_file(struct yaffs_obj
*obj
)
1678 if (!obj
->deleted
||
1679 obj
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
||
1683 if (obj
->n_data_chunks
<= 0) {
1684 /* Empty file with no duplicate object headers,
1685 * just delete it immediately */
1686 yaffs_free_tnode(obj
->my_dev
, obj
->variant
.file_variant
.top
);
1687 obj
->variant
.file_variant
.top
= NULL
;
1688 yaffs_trace(YAFFS_TRACE_TRACING
,
1689 "yaffs: Deleting empty file %d",
1691 yaffs_generic_obj_del(obj
);
1693 yaffs_soft_del_worker(obj
,
1694 obj
->variant
.file_variant
.top
,
1696 file_variant
.top_level
, 0);
1701 /* Pruning removes any part of the file structure tree that is beyond the
1702 * bounds of the file (ie that does not point to chunks).
1704 * A file should only get pruned when its size is reduced.
1706 * Before pruning, the chunks must be pulled from the tree and the
1707 * level 0 tnode entries must be zeroed out.
1708 * Could also use this for file deletion, but that's probably better handled
1709 * by a special case.
1711 * This function is recursive. For levels > 0 the function is called again on
1712 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1713 * If there is no data in a subtree then it is pruned.
1716 static struct yaffs_tnode
*yaffs_prune_worker(struct yaffs_dev
*dev
,
1717 struct yaffs_tnode
*tn
, u32 level
,
1729 for (i
= 0; i
< YAFFS_NTNODES_INTERNAL
; i
++) {
1730 if (tn
->internal
[i
]) {
1732 yaffs_prune_worker(dev
,
1735 (i
== 0) ? del0
: 1);
1738 if (tn
->internal
[i
])
1742 int tnode_size_u32
= dev
->tnode_size
/ sizeof(u32
);
1743 u32
*map
= (u32
*) tn
;
1745 for (i
= 0; !has_data
&& i
< tnode_size_u32
; i
++) {
1751 if (has_data
== 0 && del0
) {
1752 /* Free and return NULL */
1753 yaffs_free_tnode(dev
, tn
);
1759 static int yaffs_prune_tree(struct yaffs_dev
*dev
,
1760 struct yaffs_file_var
*file_struct
)
1765 struct yaffs_tnode
*tn
;
1767 if (file_struct
->top_level
< 1)
1771 yaffs_prune_worker(dev
, file_struct
->top
, file_struct
->top_level
, 0);
1773 /* Now we have a tree with all the non-zero branches NULL but
1774 * the height is the same as it was.
1775 * Let's see if we can trim internal tnodes to shorten the tree.
1776 * We can do this if only the 0th element in the tnode is in use
1777 * (ie all the non-zero are NULL)
1780 while (file_struct
->top_level
&& !done
) {
1781 tn
= file_struct
->top
;
1784 for (i
= 1; i
< YAFFS_NTNODES_INTERNAL
; i
++) {
1785 if (tn
->internal
[i
])
1790 file_struct
->top
= tn
->internal
[0];
1791 file_struct
->top_level
--;
1792 yaffs_free_tnode(dev
, tn
);
1801 /*-------------------- End of File Structure functions.-------------------*/
1803 /* alloc_empty_obj gets us a clean Object.*/
1804 static struct yaffs_obj
*yaffs_alloc_empty_obj(struct yaffs_dev
*dev
)
1806 struct yaffs_obj
*obj
= yaffs_alloc_raw_obj(dev
);
1813 /* Now sweeten it up... */
1815 memset(obj
, 0, sizeof(struct yaffs_obj
));
1816 obj
->being_created
= 1;
1820 obj
->variant_type
= YAFFS_OBJECT_TYPE_UNKNOWN
;
1821 INIT_LIST_HEAD(&(obj
->hard_links
));
1822 INIT_LIST_HEAD(&(obj
->hash_link
));
1823 INIT_LIST_HEAD(&obj
->siblings
);
1825 /* Now make the directory sane */
1826 if (dev
->root_dir
) {
1827 obj
->parent
= dev
->root_dir
;
1828 list_add(&(obj
->siblings
),
1829 &dev
->root_dir
->variant
.dir_variant
.children
);
1832 /* Add it to the lost and found directory.
1833 * NB Can't put root or lost-n-found in lost-n-found so
1834 * check if lost-n-found exists first
1836 if (dev
->lost_n_found
)
1837 yaffs_add_obj_to_dir(dev
->lost_n_found
, obj
);
1839 obj
->being_created
= 0;
1841 dev
->checkpoint_blocks_required
= 0; /* force recalculation */
1846 static int yaffs_find_nice_bucket(struct yaffs_dev
*dev
)
1850 int lowest
= 999999;
1852 /* Search for the shortest list or one that
1856 for (i
= 0; i
< 10 && lowest
> 4; i
++) {
1857 dev
->bucket_finder
++;
1858 dev
->bucket_finder
%= YAFFS_NOBJECT_BUCKETS
;
1859 if (dev
->obj_bucket
[dev
->bucket_finder
].count
< lowest
) {
1860 lowest
= dev
->obj_bucket
[dev
->bucket_finder
].count
;
1861 l
= dev
->bucket_finder
;
1868 static int yaffs_new_obj_id(struct yaffs_dev
*dev
)
1870 int bucket
= yaffs_find_nice_bucket(dev
);
1872 struct list_head
*i
;
1873 u32 n
= (u32
) bucket
;
1875 /* Now find an object value that has not already been taken
1876 * by scanning the list.
1881 n
+= YAFFS_NOBJECT_BUCKETS
;
1882 if (1 || dev
->obj_bucket
[bucket
].count
> 0) {
1883 list_for_each(i
, &dev
->obj_bucket
[bucket
].list
) {
1884 /* If there is already one in the list */
1885 if (i
&& list_entry(i
, struct yaffs_obj
,
1886 hash_link
)->obj_id
== n
) {
1895 static void yaffs_hash_obj(struct yaffs_obj
*in
)
1897 int bucket
= yaffs_hash_fn(in
->obj_id
);
1898 struct yaffs_dev
*dev
= in
->my_dev
;
1900 list_add(&in
->hash_link
, &dev
->obj_bucket
[bucket
].list
);
1901 dev
->obj_bucket
[bucket
].count
++;
1904 struct yaffs_obj
*yaffs_find_by_number(struct yaffs_dev
*dev
, u32 number
)
1906 int bucket
= yaffs_hash_fn(number
);
1907 struct list_head
*i
;
1908 struct yaffs_obj
*in
;
1910 list_for_each(i
, &dev
->obj_bucket
[bucket
].list
) {
1911 /* Look if it is in the list */
1912 in
= list_entry(i
, struct yaffs_obj
, hash_link
);
1913 if (in
->obj_id
== number
) {
1914 /* Don't show if it is defered free */
1915 if (in
->defered_free
)
1924 struct yaffs_obj
*yaffs_new_obj(struct yaffs_dev
*dev
, int number
,
1925 enum yaffs_obj_type type
)
1927 struct yaffs_obj
*the_obj
= NULL
;
1928 struct yaffs_tnode
*tn
= NULL
;
1931 number
= yaffs_new_obj_id(dev
);
1933 if (type
== YAFFS_OBJECT_TYPE_FILE
) {
1934 tn
= yaffs_get_tnode(dev
);
1939 the_obj
= yaffs_alloc_empty_obj(dev
);
1942 yaffs_free_tnode(dev
, tn
);
1947 the_obj
->rename_allowed
= 1;
1948 the_obj
->unlink_allowed
= 1;
1949 the_obj
->obj_id
= number
;
1950 yaffs_hash_obj(the_obj
);
1951 the_obj
->variant_type
= type
;
1952 yaffs_load_current_time(the_obj
, 1, 1);
1955 case YAFFS_OBJECT_TYPE_FILE
:
1956 the_obj
->variant
.file_variant
.file_size
= 0;
1957 the_obj
->variant
.file_variant
.scanned_size
= 0;
1958 the_obj
->variant
.file_variant
.shrink_size
=
1959 yaffs_max_file_size(dev
);
1960 the_obj
->variant
.file_variant
.top_level
= 0;
1961 the_obj
->variant
.file_variant
.top
= tn
;
1963 case YAFFS_OBJECT_TYPE_DIRECTORY
:
1964 INIT_LIST_HEAD(&the_obj
->variant
.dir_variant
.children
);
1965 INIT_LIST_HEAD(&the_obj
->variant
.dir_variant
.dirty
);
1967 case YAFFS_OBJECT_TYPE_SYMLINK
:
1968 case YAFFS_OBJECT_TYPE_HARDLINK
:
1969 case YAFFS_OBJECT_TYPE_SPECIAL
:
1970 /* No action required */
1972 case YAFFS_OBJECT_TYPE_UNKNOWN
:
1973 /* todo this should not happen */
1979 static struct yaffs_obj
*yaffs_create_fake_dir(struct yaffs_dev
*dev
,
1980 int number
, u32 mode
)
1983 struct yaffs_obj
*obj
=
1984 yaffs_new_obj(dev
, number
, YAFFS_OBJECT_TYPE_DIRECTORY
);
1989 obj
->fake
= 1; /* it is fake so it might not use NAND */
1990 obj
->rename_allowed
= 0;
1991 obj
->unlink_allowed
= 0;
1994 obj
->yst_mode
= mode
;
1996 obj
->hdr_chunk
= 0; /* Not a valid chunk. */
2002 static void yaffs_init_tnodes_and_objs(struct yaffs_dev
*dev
)
2008 yaffs_init_raw_tnodes_and_objs(dev
);
2010 for (i
= 0; i
< YAFFS_NOBJECT_BUCKETS
; i
++) {
2011 INIT_LIST_HEAD(&dev
->obj_bucket
[i
].list
);
2012 dev
->obj_bucket
[i
].count
= 0;
2016 struct yaffs_obj
*yaffs_find_or_create_by_number(struct yaffs_dev
*dev
,
2018 enum yaffs_obj_type type
)
2020 struct yaffs_obj
*the_obj
= NULL
;
2023 the_obj
= yaffs_find_by_number(dev
, number
);
2026 the_obj
= yaffs_new_obj(dev
, number
, type
);
2032 YCHAR
*yaffs_clone_str(const YCHAR
*str
)
2034 YCHAR
*new_str
= NULL
;
2040 len
= yaffs_strnlen(str
, YAFFS_MAX_ALIAS_LENGTH
);
2041 new_str
= kmalloc((len
+ 1) * sizeof(YCHAR
), GFP_NOFS
);
2043 yaffs_strncpy(new_str
, str
, len
);
2050 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2051 * link (ie. name) is created or deleted in the directory.
2054 * create dir/a : update dir's mtime/ctime
2055 * rm dir/a: update dir's mtime/ctime
2056 * modify dir/a: don't update dir's mtimme/ctime
2058 * This can be handled immediately or defered. Defering helps reduce the number
2059 * of updates when many files in a directory are changed within a brief period.
2061 * If the directory updating is defered then yaffs_update_dirty_dirs must be
2062 * called periodically.
2065 static void yaffs_update_parent(struct yaffs_obj
*obj
)
2067 struct yaffs_dev
*dev
;
2073 yaffs_load_current_time(obj
, 0, 1);
2074 if (dev
->param
.defered_dir_update
) {
2075 struct list_head
*link
= &obj
->variant
.dir_variant
.dirty
;
2077 if (list_empty(link
)) {
2078 list_add(link
, &dev
->dirty_dirs
);
2079 yaffs_trace(YAFFS_TRACE_BACKGROUND
,
2080 "Added object %d to dirty directories",
2085 yaffs_update_oh(obj
, NULL
, 0, 0, 0, NULL
);
2089 void yaffs_update_dirty_dirs(struct yaffs_dev
*dev
)
2091 struct list_head
*link
;
2092 struct yaffs_obj
*obj
;
2093 struct yaffs_dir_var
*d_s
;
2094 union yaffs_obj_var
*o_v
;
2096 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Update dirty directories");
2098 while (!list_empty(&dev
->dirty_dirs
)) {
2099 link
= dev
->dirty_dirs
.next
;
2100 list_del_init(link
);
2102 d_s
= list_entry(link
, struct yaffs_dir_var
, dirty
);
2103 o_v
= list_entry(d_s
, union yaffs_obj_var
, dir_variant
);
2104 obj
= list_entry(o_v
, struct yaffs_obj
, variant
);
2106 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Update directory %d",
2110 yaffs_update_oh(obj
, NULL
, 0, 0, 0, NULL
);
2115 * Mknod (create) a new object.
2116 * equiv_obj only has meaning for a hard link;
2117 * alias_str only has meaning for a symlink.
2118 * rdev only has meaning for devices (a subset of special objects)
2121 static struct yaffs_obj
*yaffs_create_obj(enum yaffs_obj_type type
,
2122 struct yaffs_obj
*parent
,
2127 struct yaffs_obj
*equiv_obj
,
2128 const YCHAR
*alias_str
, u32 rdev
)
2130 struct yaffs_obj
*in
;
2132 struct yaffs_dev
*dev
= parent
->my_dev
;
2134 /* Check if the entry exists.
2135 * If it does then fail the call since we don't want a dup. */
2136 if (yaffs_find_by_name(parent
, name
))
2139 if (type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
2140 str
= yaffs_clone_str(alias_str
);
2145 in
= yaffs_new_obj(dev
, -1, type
);
2154 in
->variant_type
= type
;
2156 in
->yst_mode
= mode
;
2158 yaffs_attribs_init(in
, gid
, uid
, rdev
);
2160 in
->n_data_chunks
= 0;
2162 yaffs_set_obj_name(in
, name
);
2165 yaffs_add_obj_to_dir(parent
, in
);
2167 in
->my_dev
= parent
->my_dev
;
2170 case YAFFS_OBJECT_TYPE_SYMLINK
:
2171 in
->variant
.symlink_variant
.alias
= str
;
2173 case YAFFS_OBJECT_TYPE_HARDLINK
:
2174 in
->variant
.hardlink_variant
.equiv_obj
= equiv_obj
;
2175 in
->variant
.hardlink_variant
.equiv_id
= equiv_obj
->obj_id
;
2176 list_add(&in
->hard_links
, &equiv_obj
->hard_links
);
2178 case YAFFS_OBJECT_TYPE_FILE
:
2179 case YAFFS_OBJECT_TYPE_DIRECTORY
:
2180 case YAFFS_OBJECT_TYPE_SPECIAL
:
2181 case YAFFS_OBJECT_TYPE_UNKNOWN
:
2186 if (yaffs_update_oh(in
, name
, 0, 0, 0, NULL
) < 0) {
2187 /* Could not create the object header, fail */
2193 yaffs_update_parent(parent
);
2198 struct yaffs_obj
*yaffs_create_file(struct yaffs_obj
*parent
,
2199 const YCHAR
*name
, u32 mode
, u32 uid
,
2202 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE
, parent
, name
, mode
,
2203 uid
, gid
, NULL
, NULL
, 0);
2206 struct yaffs_obj
*yaffs_create_dir(struct yaffs_obj
*parent
, const YCHAR
*name
,
2207 u32 mode
, u32 uid
, u32 gid
)
2209 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY
, parent
, name
,
2210 mode
, uid
, gid
, NULL
, NULL
, 0);
2213 struct yaffs_obj
*yaffs_create_special(struct yaffs_obj
*parent
,
2214 const YCHAR
*name
, u32 mode
, u32 uid
,
2217 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL
, parent
, name
, mode
,
2218 uid
, gid
, NULL
, NULL
, rdev
);
2221 struct yaffs_obj
*yaffs_create_symlink(struct yaffs_obj
*parent
,
2222 const YCHAR
*name
, u32 mode
, u32 uid
,
2223 u32 gid
, const YCHAR
*alias
)
2225 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK
, parent
, name
, mode
,
2226 uid
, gid
, NULL
, alias
, 0);
2229 /* yaffs_link_obj returns the object id of the equivalent object.*/
2230 struct yaffs_obj
*yaffs_link_obj(struct yaffs_obj
*parent
, const YCHAR
* name
,
2231 struct yaffs_obj
*equiv_obj
)
2233 /* Get the real object in case we were fed a hard link obj */
2234 equiv_obj
= yaffs_get_equivalent_obj(equiv_obj
);
2236 if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK
,
2237 parent
, name
, 0, 0, 0,
2238 equiv_obj
, NULL
, 0))
2247 /*---------------------- Block Management and Page Allocation -------------*/
2249 static void yaffs_deinit_blocks(struct yaffs_dev
*dev
)
2251 if (dev
->block_info_alt
&& dev
->block_info
)
2252 vfree(dev
->block_info
);
2254 kfree(dev
->block_info
);
2256 dev
->block_info_alt
= 0;
2258 dev
->block_info
= NULL
;
2260 if (dev
->chunk_bits_alt
&& dev
->chunk_bits
)
2261 vfree(dev
->chunk_bits
);
2263 kfree(dev
->chunk_bits
);
2264 dev
->chunk_bits_alt
= 0;
2265 dev
->chunk_bits
= NULL
;
2268 static int yaffs_init_blocks(struct yaffs_dev
*dev
)
2270 int n_blocks
= dev
->internal_end_block
- dev
->internal_start_block
+ 1;
2272 dev
->block_info
= NULL
;
2273 dev
->chunk_bits
= NULL
;
2274 dev
->alloc_block
= -1; /* force it to get a new one */
2276 /* If the first allocation strategy fails, thry the alternate one */
2278 kmalloc(n_blocks
* sizeof(struct yaffs_block_info
), GFP_NOFS
);
2279 if (!dev
->block_info
) {
2281 vmalloc(n_blocks
* sizeof(struct yaffs_block_info
));
2282 dev
->block_info_alt
= 1;
2284 dev
->block_info_alt
= 0;
2287 if (!dev
->block_info
)
2290 /* Set up dynamic blockinfo stuff. Round up bytes. */
2291 dev
->chunk_bit_stride
= (dev
->param
.chunks_per_block
+ 7) / 8;
2293 kmalloc(dev
->chunk_bit_stride
* n_blocks
, GFP_NOFS
);
2294 if (!dev
->chunk_bits
) {
2296 vmalloc(dev
->chunk_bit_stride
* n_blocks
);
2297 dev
->chunk_bits_alt
= 1;
2299 dev
->chunk_bits_alt
= 0;
2301 if (!dev
->chunk_bits
)
2305 memset(dev
->block_info
, 0, n_blocks
* sizeof(struct yaffs_block_info
));
2306 memset(dev
->chunk_bits
, 0, dev
->chunk_bit_stride
* n_blocks
);
2310 yaffs_deinit_blocks(dev
);
2315 void yaffs_block_became_dirty(struct yaffs_dev
*dev
, int block_no
)
2317 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, block_no
);
2321 /* If the block is still healthy erase it and mark as clean.
2322 * If the block has had a data failure, then retire it.
2325 yaffs_trace(YAFFS_TRACE_GC
| YAFFS_TRACE_ERASE
,
2326 "yaffs_block_became_dirty block %d state %d %s",
2327 block_no
, bi
->block_state
,
2328 (bi
->needs_retiring
) ? "needs retiring" : "");
2330 yaffs2_clear_oldest_dirty_seq(dev
, bi
);
2332 bi
->block_state
= YAFFS_BLOCK_STATE_DIRTY
;
2334 /* If this is the block being garbage collected then stop gc'ing */
2335 if (block_no
== dev
->gc_block
)
2338 /* If this block is currently the best candidate for gc
2339 * then drop as a candidate */
2340 if (block_no
== dev
->gc_dirtiest
) {
2341 dev
->gc_dirtiest
= 0;
2342 dev
->gc_pages_in_use
= 0;
2345 if (!bi
->needs_retiring
) {
2346 yaffs2_checkpt_invalidate(dev
);
2347 erased_ok
= yaffs_erase_block(dev
, block_no
);
2349 dev
->n_erase_failures
++;
2350 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
2351 "**>> Erasure failed %d", block_no
);
2355 /* Verify erasure if needed */
2357 ((yaffs_trace_mask
& YAFFS_TRACE_ERASE
) ||
2358 !yaffs_skip_verification(dev
))) {
2359 for (i
= 0; i
< dev
->param
.chunks_per_block
; i
++) {
2360 if (!yaffs_check_chunk_erased(dev
,
2361 block_no
* dev
->param
.chunks_per_block
+ i
)) {
2362 yaffs_trace(YAFFS_TRACE_ERROR
,
2363 ">>Block %d erasure supposedly OK, but chunk %d not erased",
2370 /* We lost a block of free space */
2371 dev
->n_free_chunks
-= dev
->param
.chunks_per_block
;
2372 yaffs_retire_block(dev
, block_no
);
2373 yaffs_trace(YAFFS_TRACE_ERROR
| YAFFS_TRACE_BAD_BLOCKS
,
2374 "**>> Block %d retired", block_no
);
2378 /* Clean it up... */
2379 bi
->block_state
= YAFFS_BLOCK_STATE_EMPTY
;
2381 dev
->n_erased_blocks
++;
2382 bi
->pages_in_use
= 0;
2383 bi
->soft_del_pages
= 0;
2384 bi
->has_shrink_hdr
= 0;
2385 bi
->skip_erased_check
= 1; /* Clean, so no need to check */
2386 bi
->gc_prioritise
= 0;
2387 bi
->has_summary
= 0;
2389 yaffs_clear_chunk_bits(dev
, block_no
);
2391 yaffs_trace(YAFFS_TRACE_ERASE
, "Erased block %d", block_no
);
2394 static inline int yaffs_gc_process_chunk(struct yaffs_dev
*dev
,
2395 struct yaffs_block_info
*bi
,
2396 int old_chunk
, u8
*buffer
)
2400 struct yaffs_ext_tags tags
;
2401 struct yaffs_obj
*object
;
2403 int ret_val
= YAFFS_OK
;
2405 memset(&tags
, 0, sizeof(tags
));
2406 yaffs_rd_chunk_tags_nand(dev
, old_chunk
,
2408 object
= yaffs_find_by_number(dev
, tags
.obj_id
);
2410 yaffs_trace(YAFFS_TRACE_GC_DETAIL
,
2411 "Collecting chunk in block %d, %d %d %d ",
2412 dev
->gc_chunk
, tags
.obj_id
,
2413 tags
.chunk_id
, tags
.n_bytes
);
2415 if (object
&& !yaffs_skip_verification(dev
)) {
2416 if (tags
.chunk_id
== 0)
2419 else if (object
->soft_del
)
2420 /* Defeat the test */
2421 matching_chunk
= old_chunk
;
2424 yaffs_find_chunk_in_file
2425 (object
, tags
.chunk_id
,
2428 if (old_chunk
!= matching_chunk
)
2429 yaffs_trace(YAFFS_TRACE_ERROR
,
2430 "gc: page in gc mismatch: %d %d %d %d",
2438 yaffs_trace(YAFFS_TRACE_ERROR
,
2439 "page %d in gc has no object: %d %d %d ",
2441 tags
.obj_id
, tags
.chunk_id
,
2447 object
->soft_del
&& tags
.chunk_id
!= 0) {
2448 /* Data chunk in a soft deleted file,
2450 * It's a soft deleted data chunk,
2451 * No need to copy this, just forget
2452 * about it and fix up the object.
2455 /* Free chunks already includes
2456 * softdeleted chunks, how ever this
2457 * chunk is going to soon be really
2458 * deleted which will increment free
2459 * chunks. We have to decrement free
2460 * chunks so this works out properly.
2462 dev
->n_free_chunks
--;
2463 bi
->soft_del_pages
--;
2465 object
->n_data_chunks
--;
2466 if (object
->n_data_chunks
<= 0) {
2467 /* remeber to clean up obj */
2468 dev
->gc_cleanup_list
[dev
->n_clean_ups
] = tags
.obj_id
;
2472 } else if (object
) {
2473 /* It's either a data chunk in a live
2474 * file or an ObjectHeader, so we're
2476 * NB Need to keep the ObjectHeaders of
2477 * deleted files until the whole file
2478 * has been deleted off
2480 tags
.serial_number
++;
2483 if (tags
.chunk_id
== 0) {
2484 /* It is an object Id,
2485 * We need to nuke the
2486 * shrinkheader flags since its
2488 * Also need to clean up
2491 struct yaffs_obj_hdr
*oh
;
2492 oh
= (struct yaffs_obj_hdr
*) buffer
;
2495 tags
.extra_is_shrink
= 0;
2496 oh
->shadows_obj
= 0;
2497 oh
->inband_shadowed_obj_id
= 0;
2498 tags
.extra_shadows
= 0;
2500 /* Update file size */
2501 if (object
->variant_type
== YAFFS_OBJECT_TYPE_FILE
) {
2502 yaffs_oh_size_load(oh
,
2503 object
->variant
.file_variant
.file_size
);
2504 tags
.extra_file_size
=
2505 object
->variant
.file_variant
.file_size
;
2508 yaffs_verify_oh(object
, oh
, &tags
, 1);
2510 yaffs_write_new_chunk(dev
, (u8
*) oh
, &tags
, 1);
2513 yaffs_write_new_chunk(dev
, buffer
, &tags
, 1);
2516 if (new_chunk
< 0) {
2517 ret_val
= YAFFS_FAIL
;
2520 /* Now fix up the Tnodes etc. */
2522 if (tags
.chunk_id
== 0) {
2524 object
->hdr_chunk
= new_chunk
;
2525 object
->serial
= tags
.serial_number
;
2527 /* It's a data chunk */
2528 yaffs_put_chunk_in_file(object
, tags
.chunk_id
,
2533 if (ret_val
== YAFFS_OK
)
2534 yaffs_chunk_del(dev
, old_chunk
, mark_flash
, __LINE__
);
2538 static int yaffs_gc_block(struct yaffs_dev
*dev
, int block
, int whole_block
)
2541 int ret_val
= YAFFS_OK
;
2543 int is_checkpt_block
;
2545 int chunks_before
= yaffs_get_erased_chunks(dev
);
2547 struct yaffs_block_info
*bi
= yaffs_get_block_info(dev
, block
);
2549 is_checkpt_block
= (bi
->block_state
== YAFFS_BLOCK_STATE_CHECKPOINT
);
2551 yaffs_trace(YAFFS_TRACE_TRACING
,
2552 "Collecting block %d, in use %d, shrink %d, whole_block %d",
2553 block
, bi
->pages_in_use
, bi
->has_shrink_hdr
,
2556 /*yaffs_verify_free_chunks(dev); */
2558 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
)
2559 bi
->block_state
= YAFFS_BLOCK_STATE_COLLECTING
;
2561 bi
->has_shrink_hdr
= 0; /* clear the flag so that the block can erase */
2563 dev
->gc_disable
= 1;
2565 yaffs_summary_gc(dev
, block
);
2567 if (is_checkpt_block
|| !yaffs_still_some_chunks(dev
, block
)) {
2568 yaffs_trace(YAFFS_TRACE_TRACING
,
2569 "Collecting block %d that has no chunks in use",
2571 yaffs_block_became_dirty(dev
, block
);
2574 u8
*buffer
= yaffs_get_temp_buffer(dev
);
2576 yaffs_verify_blk(dev
, bi
, block
);
2578 max_copies
= (whole_block
) ? dev
->param
.chunks_per_block
: 5;
2579 old_chunk
= block
* dev
->param
.chunks_per_block
+ dev
->gc_chunk
;
2581 for (/* init already done */ ;
2582 ret_val
== YAFFS_OK
&&
2583 dev
->gc_chunk
< dev
->param
.chunks_per_block
&&
2584 (bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) &&
2586 dev
->gc_chunk
++, old_chunk
++) {
2587 if (yaffs_check_chunk_bit(dev
, block
, dev
->gc_chunk
)) {
2588 /* Page is in use and might need to be copied */
2590 ret_val
= yaffs_gc_process_chunk(dev
, bi
,
2594 yaffs_release_temp_buffer(dev
, buffer
);
2597 yaffs_verify_collected_blk(dev
, bi
, block
);
2599 if (bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) {
2601 * The gc did not complete. Set block state back to FULL
2602 * because checkpointing does not restore gc.
2604 bi
->block_state
= YAFFS_BLOCK_STATE_FULL
;
2606 /* The gc completed. */
2607 /* Do any required cleanups */
2608 for (i
= 0; i
< dev
->n_clean_ups
; i
++) {
2609 /* Time to delete the file too */
2610 struct yaffs_obj
*object
=
2611 yaffs_find_by_number(dev
, dev
->gc_cleanup_list
[i
]);
2613 yaffs_free_tnode(dev
,
2614 object
->variant
.file_variant
.top
);
2615 object
->variant
.file_variant
.top
= NULL
;
2616 yaffs_trace(YAFFS_TRACE_GC
,
2617 "yaffs: About to finally delete object %d",
2619 yaffs_generic_obj_del(object
);
2620 object
->my_dev
->n_deleted_files
--;
2624 chunks_after
= yaffs_get_erased_chunks(dev
);
2625 if (chunks_before
>= chunks_after
)
2626 yaffs_trace(YAFFS_TRACE_GC
,
2627 "gc did not increase free chunks before %d after %d",
2628 chunks_before
, chunks_after
);
2631 dev
->n_clean_ups
= 0;
2634 dev
->gc_disable
= 0;
2640 * find_gc_block() selects the dirtiest block (or close enough)
2641 * for garbage collection.
2644 static unsigned yaffs_find_gc_block(struct yaffs_dev
*dev
,
2645 int aggressive
, int background
)
2649 unsigned selected
= 0;
2650 int prioritised
= 0;
2651 int prioritised_exist
= 0;
2652 struct yaffs_block_info
*bi
;
2655 /* First let's see if we need to grab a prioritised block */
2656 if (dev
->has_pending_prioritised_gc
&& !aggressive
) {
2657 dev
->gc_dirtiest
= 0;
2658 bi
= dev
->block_info
;
2659 for (i
= dev
->internal_start_block
;
2660 i
<= dev
->internal_end_block
&& !selected
; i
++) {
2662 if (bi
->gc_prioritise
) {
2663 prioritised_exist
= 1;
2664 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
&&
2665 yaffs_block_ok_for_gc(dev
, bi
)) {
2674 * If there is a prioritised block and none was selected then
2675 * this happened because there is at least one old dirty block
2676 * gumming up the works. Let's gc the oldest dirty block.
2679 if (prioritised_exist
&&
2680 !selected
&& dev
->oldest_dirty_block
> 0)
2681 selected
= dev
->oldest_dirty_block
;
2683 if (!prioritised_exist
) /* None found, so we can clear this */
2684 dev
->has_pending_prioritised_gc
= 0;
2687 /* If we're doing aggressive GC then we are happy to take a less-dirty
2688 * block, and search harder.
2689 * else (leasurely gc), then we only bother to do this if the
2690 * block has only a few pages in use.
2696 dev
->internal_end_block
- dev
->internal_start_block
+ 1;
2698 threshold
= dev
->param
.chunks_per_block
;
2699 iterations
= n_blocks
;
2704 max_threshold
= dev
->param
.chunks_per_block
/ 2;
2706 max_threshold
= dev
->param
.chunks_per_block
/ 8;
2708 if (max_threshold
< YAFFS_GC_PASSIVE_THRESHOLD
)
2709 max_threshold
= YAFFS_GC_PASSIVE_THRESHOLD
;
2711 threshold
= background
? (dev
->gc_not_done
+ 2) * 2 : 0;
2712 if (threshold
< YAFFS_GC_PASSIVE_THRESHOLD
)
2713 threshold
= YAFFS_GC_PASSIVE_THRESHOLD
;
2714 if (threshold
> max_threshold
)
2715 threshold
= max_threshold
;
2717 iterations
= n_blocks
/ 16 + 1;
2718 if (iterations
> 100)
2724 (dev
->gc_dirtiest
< 1 ||
2725 dev
->gc_pages_in_use
> YAFFS_GC_GOOD_ENOUGH
);
2727 dev
->gc_block_finder
++;
2728 if (dev
->gc_block_finder
< dev
->internal_start_block
||
2729 dev
->gc_block_finder
> dev
->internal_end_block
)
2730 dev
->gc_block_finder
=
2731 dev
->internal_start_block
;
2733 bi
= yaffs_get_block_info(dev
, dev
->gc_block_finder
);
2735 pages_used
= bi
->pages_in_use
- bi
->soft_del_pages
;
2737 if (bi
->block_state
== YAFFS_BLOCK_STATE_FULL
&&
2738 pages_used
< dev
->param
.chunks_per_block
&&
2739 (dev
->gc_dirtiest
< 1 ||
2740 pages_used
< dev
->gc_pages_in_use
) &&
2741 yaffs_block_ok_for_gc(dev
, bi
)) {
2742 dev
->gc_dirtiest
= dev
->gc_block_finder
;
2743 dev
->gc_pages_in_use
= pages_used
;
2747 if (dev
->gc_dirtiest
> 0 && dev
->gc_pages_in_use
<= threshold
)
2748 selected
= dev
->gc_dirtiest
;
2752 * If nothing has been selected for a while, try the oldest dirty
2753 * because that's gumming up the works.
2756 if (!selected
&& dev
->param
.is_yaffs2
&&
2757 dev
->gc_not_done
>= (background
? 10 : 20)) {
2758 yaffs2_find_oldest_dirty_seq(dev
);
2759 if (dev
->oldest_dirty_block
> 0) {
2760 selected
= dev
->oldest_dirty_block
;
2761 dev
->gc_dirtiest
= selected
;
2762 dev
->oldest_dirty_gc_count
++;
2763 bi
= yaffs_get_block_info(dev
, selected
);
2764 dev
->gc_pages_in_use
=
2765 bi
->pages_in_use
- bi
->soft_del_pages
;
2767 dev
->gc_not_done
= 0;
2772 yaffs_trace(YAFFS_TRACE_GC
,
2773 "GC Selected block %d with %d free, prioritised:%d",
2775 dev
->param
.chunks_per_block
- dev
->gc_pages_in_use
,
2782 dev
->gc_dirtiest
= 0;
2783 dev
->gc_pages_in_use
= 0;
2784 dev
->gc_not_done
= 0;
2785 if (dev
->refresh_skip
> 0)
2786 dev
->refresh_skip
--;
2789 yaffs_trace(YAFFS_TRACE_GC
,
2790 "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2791 dev
->gc_block_finder
, dev
->gc_not_done
, threshold
,
2792 dev
->gc_dirtiest
, dev
->gc_pages_in_use
,
2793 dev
->oldest_dirty_block
, background
? " bg" : "");
2799 /* New garbage collector
2800 * If we're very low on erased blocks then we do aggressive garbage collection
2801 * otherwise we do "leasurely" garbage collection.
2802 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2803 * Passive gc only inspects smaller areas and only accepts more dirty blocks.
2805 * The idea is to help clear out space in a more spread-out manner.
2806 * Dunno if it really does anything useful.
2808 static int yaffs_check_gc(struct yaffs_dev
*dev
, int background
)
2811 int gc_ok
= YAFFS_OK
;
2815 int checkpt_block_adjust
;
2817 if (dev
->param
.gc_control
&& (dev
->param
.gc_control(dev
) & 1) == 0)
2820 if (dev
->gc_disable
)
2821 /* Bail out so we don't get recursive gc */
2824 /* This loop should pass the first time.
2825 * Only loops here if the collection does not increase space.
2831 checkpt_block_adjust
= yaffs_calc_checkpt_blocks_required(dev
);
2834 dev
->param
.n_reserved_blocks
+ checkpt_block_adjust
+ 1;
2836 dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2838 /* If we need a block soon then do aggressive gc. */
2839 if (dev
->n_erased_blocks
< min_erased
)
2843 && erased_chunks
> (dev
->n_free_chunks
/ 4))
2846 if (dev
->gc_skip
> 20)
2848 if (erased_chunks
< dev
->n_free_chunks
/ 2 ||
2849 dev
->gc_skip
< 1 || background
)
2859 /* If we don't already have a block being gc'd then see if we
2860 * should start another */
2862 if (dev
->gc_block
< 1 && !aggressive
) {
2863 dev
->gc_block
= yaffs2_find_refresh_block(dev
);
2865 dev
->n_clean_ups
= 0;
2867 if (dev
->gc_block
< 1) {
2869 yaffs_find_gc_block(dev
, aggressive
, background
);
2871 dev
->n_clean_ups
= 0;
2874 if (dev
->gc_block
> 0) {
2877 dev
->passive_gc_count
++;
2879 yaffs_trace(YAFFS_TRACE_GC
,
2880 "yaffs: GC n_erased_blocks %d aggressive %d",
2881 dev
->n_erased_blocks
, aggressive
);
2883 gc_ok
= yaffs_gc_block(dev
, dev
->gc_block
, aggressive
);
2886 if (dev
->n_erased_blocks
< (dev
->param
.n_reserved_blocks
) &&
2887 dev
->gc_block
> 0) {
2888 yaffs_trace(YAFFS_TRACE_GC
,
2889 "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2890 dev
->n_erased_blocks
, max_tries
,
2893 } while ((dev
->n_erased_blocks
< dev
->param
.n_reserved_blocks
) &&
2894 (dev
->gc_block
> 0) && (max_tries
< 2));
2896 return aggressive
? gc_ok
: YAFFS_OK
;
2901 * Garbage collects. Intended to be called from a background thread.
2902 * Returns non-zero if at least half the free chunks are erased.
2904 int yaffs_bg_gc(struct yaffs_dev
*dev
, unsigned urgency
)
2906 int erased_chunks
= dev
->n_erased_blocks
* dev
->param
.chunks_per_block
;
2908 yaffs_trace(YAFFS_TRACE_BACKGROUND
, "Background gc %u", urgency
);
2910 yaffs_check_gc(dev
, 1);
2911 return erased_chunks
> dev
->n_free_chunks
/ 2;
2914 /*-------------------- Data file manipulation -----------------*/
2916 static int yaffs_rd_data_obj(struct yaffs_obj
*in
, int inode_chunk
, u8
* buffer
)
2918 int nand_chunk
= yaffs_find_chunk_in_file(in
, inode_chunk
, NULL
);
2920 if (nand_chunk
>= 0)
2921 return yaffs_rd_chunk_tags_nand(in
->my_dev
, nand_chunk
,
2924 yaffs_trace(YAFFS_TRACE_NANDACCESS
,
2925 "Chunk %d not found zero instead",
2927 /* get sane (zero) data if you read a hole */
2928 memset(buffer
, 0, in
->my_dev
->data_bytes_per_chunk
);
2934 void yaffs_chunk_del(struct yaffs_dev
*dev
, int chunk_id
, int mark_flash
,
2939 struct yaffs_ext_tags tags
;
2940 struct yaffs_block_info
*bi
;
2946 block
= chunk_id
/ dev
->param
.chunks_per_block
;
2947 page
= chunk_id
% dev
->param
.chunks_per_block
;
2949 if (!yaffs_check_chunk_bit(dev
, block
, page
))
2950 yaffs_trace(YAFFS_TRACE_VERIFY
,
2951 "Deleting invalid chunk %d", chunk_id
);
2953 bi
= yaffs_get_block_info(dev
, block
);
2955 yaffs2_update_oldest_dirty_seq(dev
, block
, bi
);
2957 yaffs_trace(YAFFS_TRACE_DELETION
,
2958 "line %d delete of chunk %d",
2961 if (!dev
->param
.is_yaffs2
&& mark_flash
&&
2962 bi
->block_state
!= YAFFS_BLOCK_STATE_COLLECTING
) {
2964 memset(&tags
, 0, sizeof(tags
));
2965 tags
.is_deleted
= 1;
2966 yaffs_wr_chunk_tags_nand(dev
, chunk_id
, NULL
, &tags
);
2967 yaffs_handle_chunk_update(dev
, chunk_id
, &tags
);
2969 dev
->n_unmarked_deletions
++;
2972 /* Pull out of the management area.
2973 * If the whole block became dirty, this will kick off an erasure.
2975 if (bi
->block_state
== YAFFS_BLOCK_STATE_ALLOCATING
||
2976 bi
->block_state
== YAFFS_BLOCK_STATE_FULL
||
2977 bi
->block_state
== YAFFS_BLOCK_STATE_NEEDS_SCAN
||
2978 bi
->block_state
== YAFFS_BLOCK_STATE_COLLECTING
) {
2979 dev
->n_free_chunks
++;
2980 yaffs_clear_chunk_bit(dev
, block
, page
);
2983 if (bi
->pages_in_use
== 0 &&
2984 !bi
->has_shrink_hdr
&&
2985 bi
->block_state
!= YAFFS_BLOCK_STATE_ALLOCATING
&&
2986 bi
->block_state
!= YAFFS_BLOCK_STATE_NEEDS_SCAN
) {
2987 yaffs_block_became_dirty(dev
, block
);
2992 static int yaffs_wr_data_obj(struct yaffs_obj
*in
, int inode_chunk
,
2993 const u8
*buffer
, int n_bytes
, int use_reserve
)
2995 /* Find old chunk Need to do this to get serial number
2996 * Write new one and patch into tree.
2997 * Invalidate old tags.
3001 struct yaffs_ext_tags prev_tags
;
3003 struct yaffs_ext_tags new_tags
;
3004 struct yaffs_dev
*dev
= in
->my_dev
;
3006 yaffs_check_gc(dev
, 0);
3008 /* Get the previous chunk at this location in the file if it exists.
3009 * If it does not exist then put a zero into the tree. This creates
3010 * the tnode now, rather than later when it is harder to clean up.
3012 prev_chunk_id
= yaffs_find_chunk_in_file(in
, inode_chunk
, &prev_tags
);
3013 if (prev_chunk_id
< 1 &&
3014 !yaffs_put_chunk_in_file(in
, inode_chunk
, 0, 0))
3017 /* Set up new tags */
3018 memset(&new_tags
, 0, sizeof(new_tags
));
3020 new_tags
.chunk_id
= inode_chunk
;
3021 new_tags
.obj_id
= in
->obj_id
;
3022 new_tags
.serial_number
=
3023 (prev_chunk_id
> 0) ? prev_tags
.serial_number
+ 1 : 1;
3024 new_tags
.n_bytes
= n_bytes
;
3026 if (n_bytes
< 1 || n_bytes
> dev
->param
.total_bytes_per_chunk
) {
3027 yaffs_trace(YAFFS_TRACE_ERROR
,
3028 "Writing %d bytes to chunk!!!!!!!!!",
3034 yaffs_write_new_chunk(dev
, buffer
, &new_tags
, use_reserve
);
3036 if (new_chunk_id
> 0) {
3037 yaffs_put_chunk_in_file(in
, inode_chunk
, new_chunk_id
, 0);
3039 if (prev_chunk_id
> 0)
3040 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3042 yaffs_verify_file_sane(in
);
3044 return new_chunk_id
;
3050 static int yaffs_do_xattrib_mod(struct yaffs_obj
*obj
, int set
,
3051 const YCHAR
*name
, const void *value
, int size
,
3054 struct yaffs_xattr_mod xmod
;
3062 xmod
.result
= -ENOSPC
;
3064 result
= yaffs_update_oh(obj
, NULL
, 0, 0, 0, &xmod
);
3072 static int yaffs_apply_xattrib_mod(struct yaffs_obj
*obj
, char *buffer
,
3073 struct yaffs_xattr_mod
*xmod
)
3076 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3077 struct yaffs_dev
*dev
= obj
->my_dev
;
3078 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3079 char *x_buffer
= buffer
+ x_offs
;
3083 nval_set(x_buffer
, x_size
, xmod
->name
, xmod
->data
,
3084 xmod
->size
, xmod
->flags
);
3086 retval
= nval_del(x_buffer
, x_size
, xmod
->name
);
3088 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3089 obj
->xattr_known
= 1;
3090 xmod
->result
= retval
;
3095 static int yaffs_do_xattrib_fetch(struct yaffs_obj
*obj
, const YCHAR
*name
,
3096 void *value
, int size
)
3098 char *buffer
= NULL
;
3100 struct yaffs_ext_tags tags
;
3101 struct yaffs_dev
*dev
= obj
->my_dev
;
3102 int x_offs
= sizeof(struct yaffs_obj_hdr
);
3103 int x_size
= dev
->data_bytes_per_chunk
- sizeof(struct yaffs_obj_hdr
);
3107 if (obj
->hdr_chunk
< 1)
3110 /* If we know that the object has no xattribs then don't do all the
3111 * reading and parsing.
3113 if (obj
->xattr_known
&& !obj
->has_xattr
) {
3120 buffer
= (char *)yaffs_get_temp_buffer(dev
);
3125 yaffs_rd_chunk_tags_nand(dev
, obj
->hdr_chunk
, (u8
*) buffer
, &tags
);
3127 if (result
!= YAFFS_OK
)
3130 x_buffer
= buffer
+ x_offs
;
3132 if (!obj
->xattr_known
) {
3133 obj
->has_xattr
= nval_hasvalues(x_buffer
, x_size
);
3134 obj
->xattr_known
= 1;
3138 retval
= nval_get(x_buffer
, x_size
, name
, value
, size
);
3140 retval
= nval_list(x_buffer
, x_size
, value
, size
);
3142 yaffs_release_temp_buffer(dev
, (u8
*) buffer
);
3146 int yaffs_set_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
,
3147 const void *value
, int size
, int flags
)
3149 return yaffs_do_xattrib_mod(obj
, 1, name
, value
, size
, flags
);
3152 int yaffs_remove_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
)
3154 return yaffs_do_xattrib_mod(obj
, 0, name
, NULL
, 0, 0);
3157 int yaffs_get_xattrib(struct yaffs_obj
*obj
, const YCHAR
* name
, void *value
,
3160 return yaffs_do_xattrib_fetch(obj
, name
, value
, size
);
3163 int yaffs_list_xattrib(struct yaffs_obj
*obj
, char *buffer
, int size
)
3165 return yaffs_do_xattrib_fetch(obj
, NULL
, buffer
, size
);
3168 static void yaffs_check_obj_details_loaded(struct yaffs_obj
*in
)
3171 struct yaffs_obj_hdr
*oh
;
3172 struct yaffs_dev
*dev
;
3173 struct yaffs_ext_tags tags
;
3175 if (!in
|| !in
->lazy_loaded
|| in
->hdr_chunk
< 1)
3179 in
->lazy_loaded
= 0;
3180 buf
= yaffs_get_temp_buffer(dev
);
3182 yaffs_rd_chunk_tags_nand(dev
, in
->hdr_chunk
, buf
, &tags
);
3183 oh
= (struct yaffs_obj_hdr
*)buf
;
3185 in
->yst_mode
= oh
->yst_mode
;
3186 yaffs_load_attribs(in
, oh
);
3187 yaffs_set_obj_name_from_oh(in
, oh
);
3189 if (in
->variant_type
== YAFFS_OBJECT_TYPE_SYMLINK
) {
3190 in
->variant
.symlink_variant
.alias
=
3191 yaffs_clone_str(oh
->alias
);
3193 yaffs_release_temp_buffer(dev
, buf
);
3196 static void yaffs_load_name_from_oh(struct yaffs_dev
*dev
, YCHAR
*name
,
3197 const YCHAR
*oh_name
, int buff_size
)
3199 #ifdef CONFIG_YAFFS_AUTO_UNICODE
3200 if (dev
->param
.auto_unicode
) {
3202 /* It is an ASCII name, do an ASCII to
3203 * unicode conversion */
3204 const char *ascii_oh_name
= (const char *)oh_name
;
3205 int n
= buff_size
- 1;
3206 while (n
> 0 && *ascii_oh_name
) {
3207 *name
= *ascii_oh_name
;
3213 yaffs_strncpy(name
, oh_name
+ 1, buff_size
- 1);
3220 yaffs_strncpy(name
, oh_name
, buff_size
- 1);
3224 static void yaffs_load_oh_from_name(struct yaffs_dev
*dev
, YCHAR
*oh_name
,
3227 #ifdef CONFIG_YAFFS_AUTO_UNICODE
3232 if (dev
->param
.auto_unicode
) {
3237 /* Figure out if the name will fit in ascii character set */
3238 while (is_ascii
&& *w
) {
3245 /* It is an ASCII name, so convert unicode to ascii */
3246 char *ascii_oh_name
= (char *)oh_name
;
3247 int n
= YAFFS_MAX_NAME_LENGTH
- 1;
3248 while (n
> 0 && *name
) {
3249 *ascii_oh_name
= *name
;
3255 /* Unicode name, so save starting at the second YCHAR */
3257 yaffs_strncpy(oh_name
+ 1, name
, YAFFS_MAX_NAME_LENGTH
- 2);
3264 yaffs_strncpy(oh_name
, name
, YAFFS_MAX_NAME_LENGTH
- 1);
3268 /* UpdateObjectHeader updates the header on NAND for an object.
3269 * If name is not NULL, then that new name is used.
3271 int yaffs_update_oh(struct yaffs_obj
*in
, const YCHAR
*name
, int force
,
3272 int is_shrink
, int shadows
, struct yaffs_xattr_mod
*xmod
)
3275 struct yaffs_block_info
*bi
;
3276 struct yaffs_dev
*dev
= in
->my_dev
;
3280 struct yaffs_ext_tags new_tags
;
3281 struct yaffs_ext_tags old_tags
;
3282 const YCHAR
*alias
= NULL
;
3284 YCHAR old_name
[YAFFS_MAX_NAME_LENGTH
+ 1];
3285 struct yaffs_obj_hdr
*oh
= NULL
;
3286 loff_t file_size
= 0;
3288 yaffs_strcpy(old_name
, _Y("silly old name"));
3290 if (in
->fake
&& in
!= dev
->root_dir
&& !force
&& !xmod
)
3293 yaffs_check_gc(dev
, 0);
3294 yaffs_check_obj_details_loaded(in
);
3296 buffer
= yaffs_get_temp_buffer(in
->my_dev
);
3297 oh
= (struct yaffs_obj_hdr
*)buffer
;
3299 prev_chunk_id
= in
->hdr_chunk
;
3301 if (prev_chunk_id
> 0) {
3302 yaffs_rd_chunk_tags_nand(dev
, prev_chunk_id
,
3305 yaffs_verify_oh(in
, oh
, &old_tags
, 0);
3306 memcpy(old_name
, oh
->name
, sizeof(oh
->name
));
3307 memset(buffer
, 0xff, sizeof(struct yaffs_obj_hdr
));
3309 memset(buffer
, 0xff, dev
->data_bytes_per_chunk
);
3312 oh
->type
= in
->variant_type
;
3313 oh
->yst_mode
= in
->yst_mode
;
3314 oh
->shadows_obj
= oh
->inband_shadowed_obj_id
= shadows
;
3316 yaffs_load_attribs_oh(oh
, in
);
3319 oh
->parent_obj_id
= in
->parent
->obj_id
;
3321 oh
->parent_obj_id
= 0;
3323 if (name
&& *name
) {
3324 memset(oh
->name
, 0, sizeof(oh
->name
));
3325 yaffs_load_oh_from_name(dev
, oh
->name
, name
);
3326 } else if (prev_chunk_id
> 0) {
3327 memcpy(oh
->name
, old_name
, sizeof(oh
->name
));
3329 memset(oh
->name
, 0, sizeof(oh
->name
));
3332 oh
->is_shrink
= is_shrink
;
3334 switch (in
->variant_type
) {
3335 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3336 /* Should not happen */
3338 case YAFFS_OBJECT_TYPE_FILE
:
3339 if (oh
->parent_obj_id
!= YAFFS_OBJECTID_DELETED
&&
3340 oh
->parent_obj_id
!= YAFFS_OBJECTID_UNLINKED
)
3341 file_size
= in
->variant
.file_variant
.file_size
;
3342 yaffs_oh_size_load(oh
, file_size
);
3344 case YAFFS_OBJECT_TYPE_HARDLINK
:
3345 oh
->equiv_id
= in
->variant
.hardlink_variant
.equiv_id
;
3347 case YAFFS_OBJECT_TYPE_SPECIAL
:
3350 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3353 case YAFFS_OBJECT_TYPE_SYMLINK
:
3354 alias
= in
->variant
.symlink_variant
.alias
;
3356 alias
= _Y("no alias");
3357 yaffs_strncpy(oh
->alias
, alias
, YAFFS_MAX_ALIAS_LENGTH
);
3358 oh
->alias
[YAFFS_MAX_ALIAS_LENGTH
] = 0;
3362 /* process any xattrib modifications */
3364 yaffs_apply_xattrib_mod(in
, (char *)buffer
, xmod
);
3367 memset(&new_tags
, 0, sizeof(new_tags
));
3369 new_tags
.chunk_id
= 0;
3370 new_tags
.obj_id
= in
->obj_id
;
3371 new_tags
.serial_number
= in
->serial
;
3373 /* Add extra info for file header */
3374 new_tags
.extra_available
= 1;
3375 new_tags
.extra_parent_id
= oh
->parent_obj_id
;
3376 new_tags
.extra_file_size
= file_size
;
3377 new_tags
.extra_is_shrink
= oh
->is_shrink
;
3378 new_tags
.extra_equiv_id
= oh
->equiv_id
;
3379 new_tags
.extra_shadows
= (oh
->shadows_obj
> 0) ? 1 : 0;
3380 new_tags
.extra_obj_type
= in
->variant_type
;
3381 yaffs_verify_oh(in
, oh
, &new_tags
, 1);
3383 /* Create new chunk in NAND */
3385 yaffs_write_new_chunk(dev
, buffer
, &new_tags
,
3386 (prev_chunk_id
> 0) ? 1 : 0);
3389 yaffs_release_temp_buffer(dev
, buffer
);
3391 if (new_chunk_id
< 0)
3392 return new_chunk_id
;
3394 in
->hdr_chunk
= new_chunk_id
;
3396 if (prev_chunk_id
> 0)
3397 yaffs_chunk_del(dev
, prev_chunk_id
, 1, __LINE__
);
3399 if (!yaffs_obj_cache_dirty(in
))
3402 /* If this was a shrink, then mark the block
3403 * that the chunk lives on */
3405 bi
= yaffs_get_block_info(in
->my_dev
,
3407 in
->my_dev
->param
.chunks_per_block
);
3408 bi
->has_shrink_hdr
= 1;
3412 return new_chunk_id
;
3415 /*--------------------- File read/write ------------------------
3416 * Read and write have very similar structures.
3417 * In general the read/write has three parts to it
3418 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3419 * Some complete chunks
3420 * An incomplete chunk to end off with
3422 * Curve-balls: the first chunk might also be the last chunk.
3425 int yaffs_file_rd(struct yaffs_obj
*in
, u8
* buffer
, loff_t offset
, int n_bytes
)
3432 struct yaffs_cache
*cache
;
3433 struct yaffs_dev
*dev
;
3438 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3441 /* OK now check for the curveball where the start and end are in
3444 if ((start
+ n
) < dev
->data_bytes_per_chunk
)
3447 n_copy
= dev
->data_bytes_per_chunk
- start
;
3449 cache
= yaffs_find_chunk_cache(in
, chunk
);
3451 /* If the chunk is already in the cache or it is less than
3452 * a whole chunk or we're using inband tags then use the cache
3453 * (if there is caching) else bypass the cache.
3455 if (cache
|| n_copy
!= dev
->data_bytes_per_chunk
||
3456 dev
->param
.inband_tags
) {
3457 if (dev
->param
.n_caches
> 0) {
3459 /* If we can't find the data in the cache,
3460 * then load it up. */
3464 yaffs_grab_chunk_cache(in
->my_dev
);
3466 cache
->chunk_id
= chunk
;
3469 yaffs_rd_data_obj(in
, chunk
,
3474 yaffs_use_cache(dev
, cache
, 0);
3478 memcpy(buffer
, &cache
->data
[start
], n_copy
);
3482 /* Read into the local buffer then copy.. */
3485 yaffs_get_temp_buffer(dev
);
3486 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3488 memcpy(buffer
, &local_buffer
[start
], n_copy
);
3490 yaffs_release_temp_buffer(dev
, local_buffer
);
3493 /* A full chunk. Read directly into the buffer. */
3494 yaffs_rd_data_obj(in
, chunk
, buffer
);
3504 int yaffs_do_file_wr(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3505 int n_bytes
, int write_through
)
3514 loff_t start_write
= offset
;
3515 int chunk_written
= 0;
3518 struct yaffs_dev
*dev
;
3522 while (n
> 0 && chunk_written
>= 0) {
3523 yaffs_addr_to_chunk(dev
, offset
, &chunk
, &start
);
3525 if (((loff_t
)chunk
) *
3526 dev
->data_bytes_per_chunk
+ start
!= offset
||
3527 start
>= dev
->data_bytes_per_chunk
) {
3528 yaffs_trace(YAFFS_TRACE_ERROR
,
3529 "AddrToChunk of offset %lld gives chunk %d start %d",
3530 offset
, chunk
, start
);
3532 chunk
++; /* File pos to chunk in file offset */
3534 /* OK now check for the curveball where the start and end are in
3538 if ((start
+ n
) < dev
->data_bytes_per_chunk
) {
3541 /* Now calculate how many bytes to write back....
3542 * If we're overwriting and not writing to then end of
3543 * file then we need to write back as much as was there
3547 chunk_start
= (((loff_t
)(chunk
- 1)) *
3548 dev
->data_bytes_per_chunk
);
3550 if (chunk_start
> in
->variant
.file_variant
.file_size
)
3551 n_bytes_read
= 0; /* Past end of file */
3554 in
->variant
.file_variant
.file_size
-
3557 if (n_bytes_read
> dev
->data_bytes_per_chunk
)
3558 n_bytes_read
= dev
->data_bytes_per_chunk
;
3562 (start
+ n
)) ? n_bytes_read
: (start
+ n
);
3564 if (n_writeback
< 0 ||
3565 n_writeback
> dev
->data_bytes_per_chunk
)
3569 n_copy
= dev
->data_bytes_per_chunk
- start
;
3570 n_writeback
= dev
->data_bytes_per_chunk
;
3573 if (n_copy
!= dev
->data_bytes_per_chunk
||
3574 dev
->param
.inband_tags
) {
3575 /* An incomplete start or end chunk (or maybe both
3576 * start and end chunk), or we're using inband tags,
3577 * so we want to use the cache buffers.
3579 if (dev
->param
.n_caches
> 0) {
3580 struct yaffs_cache
*cache
;
3582 /* If we can't find the data in the cache, then
3584 cache
= yaffs_find_chunk_cache(in
, chunk
);
3587 yaffs_check_alloc_available(dev
, 1)) {
3588 cache
= yaffs_grab_chunk_cache(dev
);
3590 cache
->chunk_id
= chunk
;
3593 yaffs_rd_data_obj(in
, chunk
,
3597 !yaffs_check_alloc_available(dev
,
3599 /* Drop the cache if it was a read cache
3600 * item and no space check has been made
3607 yaffs_use_cache(dev
, cache
, 1);
3610 memcpy(&cache
->data
[start
], buffer
,
3614 cache
->n_bytes
= n_writeback
;
3616 if (write_through
) {
3626 chunk_written
= -1; /* fail write */
3629 /* An incomplete start or end chunk (or maybe
3630 * both start and end chunk). Read into the
3631 * local buffer then copy over and write back.
3634 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3636 yaffs_rd_data_obj(in
, chunk
, local_buffer
);
3637 memcpy(&local_buffer
[start
], buffer
, n_copy
);
3640 yaffs_wr_data_obj(in
, chunk
,
3644 yaffs_release_temp_buffer(dev
, local_buffer
);
3647 /* A full chunk. Write directly from the buffer. */
3650 yaffs_wr_data_obj(in
, chunk
, buffer
,
3651 dev
->data_bytes_per_chunk
, 0);
3653 /* Since we've overwritten the cached data,
3654 * we better invalidate it. */
3655 yaffs_invalidate_chunk_cache(in
, chunk
);
3658 if (chunk_written
>= 0) {
3666 /* Update file object */
3668 if ((start_write
+ n_done
) > in
->variant
.file_variant
.file_size
)
3669 in
->variant
.file_variant
.file_size
= (start_write
+ n_done
);
3675 int yaffs_wr_file(struct yaffs_obj
*in
, const u8
*buffer
, loff_t offset
,
3676 int n_bytes
, int write_through
)
3678 yaffs2_handle_hole(in
, offset
);
3679 return yaffs_do_file_wr(in
, buffer
, offset
, n_bytes
, write_through
);
3682 /* ---------------------- File resizing stuff ------------------ */
3684 static void yaffs_prune_chunks(struct yaffs_obj
*in
, loff_t new_size
)
3687 struct yaffs_dev
*dev
= in
->my_dev
;
3688 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3696 yaffs_addr_to_chunk(dev
, old_size
- 1, &last_del
, &dummy
);
3700 yaffs_addr_to_chunk(dev
, new_size
+ dev
->data_bytes_per_chunk
- 1,
3701 &start_del
, &dummy
);
3705 /* Delete backwards so that we don't end up with holes if
3706 * power is lost part-way through the operation.
3708 for (i
= last_del
; i
>= start_del
; i
--) {
3709 /* NB this could be optimised somewhat,
3710 * eg. could retrieve the tags and write them without
3711 * using yaffs_chunk_del
3714 chunk_id
= yaffs_find_del_file_chunk(in
, i
, NULL
);
3720 (dev
->internal_start_block
* dev
->param
.chunks_per_block
) ||
3722 ((dev
->internal_end_block
+ 1) *
3723 dev
->param
.chunks_per_block
)) {
3724 yaffs_trace(YAFFS_TRACE_ALWAYS
,
3725 "Found daft chunk_id %d for %d",
3728 in
->n_data_chunks
--;
3729 yaffs_chunk_del(dev
, chunk_id
, 1, __LINE__
);
3734 void yaffs_resize_file_down(struct yaffs_obj
*obj
, loff_t new_size
)
3738 struct yaffs_dev
*dev
= obj
->my_dev
;
3740 yaffs_addr_to_chunk(dev
, new_size
, &new_full
, &new_partial
);
3742 yaffs_prune_chunks(obj
, new_size
);
3744 if (new_partial
!= 0) {
3745 int last_chunk
= 1 + new_full
;
3746 u8
*local_buffer
= yaffs_get_temp_buffer(dev
);
3748 /* Rewrite the last chunk with its new size and zero pad */
3749 yaffs_rd_data_obj(obj
, last_chunk
, local_buffer
);
3750 memset(local_buffer
+ new_partial
, 0,
3751 dev
->data_bytes_per_chunk
- new_partial
);
3753 yaffs_wr_data_obj(obj
, last_chunk
, local_buffer
,
3756 yaffs_release_temp_buffer(dev
, local_buffer
);
3759 obj
->variant
.file_variant
.file_size
= new_size
;
3761 yaffs_prune_tree(dev
, &obj
->variant
.file_variant
);
3764 int yaffs_resize_file(struct yaffs_obj
*in
, loff_t new_size
)
3766 struct yaffs_dev
*dev
= in
->my_dev
;
3767 loff_t old_size
= in
->variant
.file_variant
.file_size
;
3769 yaffs_flush_file_cache(in
);
3770 yaffs_invalidate_whole_cache(in
);
3772 yaffs_check_gc(dev
, 0);
3774 if (in
->variant_type
!= YAFFS_OBJECT_TYPE_FILE
)
3777 if (new_size
== old_size
)
3780 if (new_size
> old_size
) {
3781 yaffs2_handle_hole(in
, new_size
);
3782 in
->variant
.file_variant
.file_size
= new_size
;
3784 /* new_size < old_size */
3785 yaffs_resize_file_down(in
, new_size
);
3788 /* Write a new object header to reflect the resize.
3789 * show we've shrunk the file, if need be
3790 * Do this only if the file is not in the deleted directories
3791 * and is not shadowed.
3795 in
->parent
->obj_id
!= YAFFS_OBJECTID_UNLINKED
&&
3796 in
->parent
->obj_id
!= YAFFS_OBJECTID_DELETED
)
3797 yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
);
3802 int yaffs_flush_file(struct yaffs_obj
*in
, int update_time
, int data_sync
)
3807 yaffs_flush_file_cache(in
);
3813 yaffs_load_current_time(in
, 0, 0);
3815 return (yaffs_update_oh(in
, NULL
, 0, 0, 0, NULL
) >= 0) ?
3816 YAFFS_OK
: YAFFS_FAIL
;
3820 /* yaffs_del_file deletes the whole file data
3821 * and the inode associated with the file.
3822 * It does not delete the links associated with the file.
3824 static int yaffs_unlink_file_if_needed(struct yaffs_obj
*in
)
3828 struct yaffs_dev
*dev
= in
->my_dev
;
3835 yaffs_change_obj_name(in
, in
->my_dev
->del_dir
,
3836 _Y("deleted"), 0, 0);
3837 yaffs_trace(YAFFS_TRACE_TRACING
,
3838 "yaffs: immediate deletion of file %d",
3841 in
->my_dev
->n_deleted_files
++;
3842 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3843 yaffs_resize_file(in
, 0);
3844 yaffs_soft_del_file(in
);
3847 yaffs_change_obj_name(in
, in
->my_dev
->unlinked_dir
,
3848 _Y("unlinked"), 0, 0);
3853 int yaffs_del_file(struct yaffs_obj
*in
)
3855 int ret_val
= YAFFS_OK
;
3856 int deleted
; /* Need to cache value on stack if in is freed */
3857 struct yaffs_dev
*dev
= in
->my_dev
;
3859 if (dev
->param
.disable_soft_del
|| dev
->param
.is_yaffs2
)
3860 yaffs_resize_file(in
, 0);
3862 if (in
->n_data_chunks
> 0) {
3863 /* Use soft deletion if there is data in the file.
3864 * That won't be the case if it has been resized to zero.
3867 ret_val
= yaffs_unlink_file_if_needed(in
);
3869 deleted
= in
->deleted
;
3871 if (ret_val
== YAFFS_OK
&& in
->unlinked
&& !in
->deleted
) {
3874 in
->my_dev
->n_deleted_files
++;
3875 yaffs_soft_del_file(in
);
3877 return deleted
? YAFFS_OK
: YAFFS_FAIL
;
3879 /* The file has no data chunks so we toss it immediately */
3880 yaffs_free_tnode(in
->my_dev
, in
->variant
.file_variant
.top
);
3881 in
->variant
.file_variant
.top
= NULL
;
3882 yaffs_generic_obj_del(in
);
3888 int yaffs_is_non_empty_dir(struct yaffs_obj
*obj
)
3891 obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
) &&
3892 !(list_empty(&obj
->variant
.dir_variant
.children
));
3895 static int yaffs_del_dir(struct yaffs_obj
*obj
)
3897 /* First check that the directory is empty. */
3898 if (yaffs_is_non_empty_dir(obj
))
3901 return yaffs_generic_obj_del(obj
);
3904 static int yaffs_del_symlink(struct yaffs_obj
*in
)
3906 kfree(in
->variant
.symlink_variant
.alias
);
3907 in
->variant
.symlink_variant
.alias
= NULL
;
3909 return yaffs_generic_obj_del(in
);
3912 static int yaffs_del_link(struct yaffs_obj
*in
)
3914 /* remove this hardlink from the list associated with the equivalent
3917 list_del_init(&in
->hard_links
);
3918 return yaffs_generic_obj_del(in
);
3921 int yaffs_del_obj(struct yaffs_obj
*obj
)
3925 switch (obj
->variant_type
) {
3926 case YAFFS_OBJECT_TYPE_FILE
:
3927 ret_val
= yaffs_del_file(obj
);
3929 case YAFFS_OBJECT_TYPE_DIRECTORY
:
3930 if (!list_empty(&obj
->variant
.dir_variant
.dirty
)) {
3931 yaffs_trace(YAFFS_TRACE_BACKGROUND
,
3932 "Remove object %d from dirty directories",
3934 list_del_init(&obj
->variant
.dir_variant
.dirty
);
3936 return yaffs_del_dir(obj
);
3938 case YAFFS_OBJECT_TYPE_SYMLINK
:
3939 ret_val
= yaffs_del_symlink(obj
);
3941 case YAFFS_OBJECT_TYPE_HARDLINK
:
3942 ret_val
= yaffs_del_link(obj
);
3944 case YAFFS_OBJECT_TYPE_SPECIAL
:
3945 ret_val
= yaffs_generic_obj_del(obj
);
3947 case YAFFS_OBJECT_TYPE_UNKNOWN
:
3949 break; /* should not happen. */
3954 static int yaffs_unlink_worker(struct yaffs_obj
*obj
)
3964 yaffs_update_parent(obj
->parent
);
3966 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
3967 return yaffs_del_link(obj
);
3968 } else if (!list_empty(&obj
->hard_links
)) {
3969 /* Curve ball: We're unlinking an object that has a hardlink.
3971 * This problem arises because we are not strictly following
3972 * The Linux link/inode model.
3974 * We can't really delete the object.
3975 * Instead, we do the following:
3976 * - Select a hardlink.
3977 * - Unhook it from the hard links
3978 * - Move it from its parent directory so that the rename works.
3979 * - Rename the object to the hardlink's name.
3980 * - Delete the hardlink
3983 struct yaffs_obj
*hl
;
3984 struct yaffs_obj
*parent
;
3986 YCHAR name
[YAFFS_MAX_NAME_LENGTH
+ 1];
3988 hl
= list_entry(obj
->hard_links
.next
, struct yaffs_obj
,
3991 yaffs_get_obj_name(hl
, name
, YAFFS_MAX_NAME_LENGTH
+ 1);
3992 parent
= hl
->parent
;
3994 list_del_init(&hl
->hard_links
);
3996 yaffs_add_obj_to_dir(obj
->my_dev
->unlinked_dir
, hl
);
3998 ret_val
= yaffs_change_obj_name(obj
, parent
, name
, 0, 0);
4000 if (ret_val
== YAFFS_OK
)
4001 ret_val
= yaffs_generic_obj_del(hl
);
4005 } else if (del_now
) {
4006 switch (obj
->variant_type
) {
4007 case YAFFS_OBJECT_TYPE_FILE
:
4008 return yaffs_del_file(obj
);
4010 case YAFFS_OBJECT_TYPE_DIRECTORY
:
4011 list_del_init(&obj
->variant
.dir_variant
.dirty
);
4012 return yaffs_del_dir(obj
);
4014 case YAFFS_OBJECT_TYPE_SYMLINK
:
4015 return yaffs_del_symlink(obj
);
4017 case YAFFS_OBJECT_TYPE_SPECIAL
:
4018 return yaffs_generic_obj_del(obj
);
4020 case YAFFS_OBJECT_TYPE_HARDLINK
:
4021 case YAFFS_OBJECT_TYPE_UNKNOWN
:
4025 } else if (yaffs_is_non_empty_dir(obj
)) {
4028 return yaffs_change_obj_name(obj
, obj
->my_dev
->unlinked_dir
,
4029 _Y("unlinked"), 0, 0);
4033 static int yaffs_unlink_obj(struct yaffs_obj
*obj
)
4035 if (obj
&& obj
->unlink_allowed
)
4036 return yaffs_unlink_worker(obj
);
4041 int yaffs_unlinker(struct yaffs_obj
*dir
, const YCHAR
*name
)
4043 struct yaffs_obj
*obj
;
4045 obj
= yaffs_find_by_name(dir
, name
);
4046 return yaffs_unlink_obj(obj
);
4050 * If old_name is NULL then we take old_dir as the object to be renamed.
4052 int yaffs_rename_obj(struct yaffs_obj
*old_dir
, const YCHAR
*old_name
,
4053 struct yaffs_obj
*new_dir
, const YCHAR
*new_name
)
4055 struct yaffs_obj
*obj
= NULL
;
4056 struct yaffs_obj
*existing_target
= NULL
;
4059 struct yaffs_dev
*dev
;
4061 if (!old_dir
|| old_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4065 if (!new_dir
|| new_dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4070 dev
= old_dir
->my_dev
;
4072 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4073 /* Special case for case insemsitive systems.
4074 * While look-up is case insensitive, the name isn't.
4075 * Therefore we might want to change x.txt to X.txt
4077 if (old_dir
== new_dir
&&
4078 old_name
&& new_name
&&
4079 yaffs_strcmp(old_name
, new_name
) == 0)
4083 if (yaffs_strnlen(new_name
, YAFFS_MAX_NAME_LENGTH
+ 1) >
4084 YAFFS_MAX_NAME_LENGTH
)
4089 obj
= yaffs_find_by_name(old_dir
, old_name
);
4092 old_dir
= obj
->parent
;
4095 if (obj
&& obj
->rename_allowed
) {
4096 /* Now handle an existing target, if there is one */
4097 existing_target
= yaffs_find_by_name(new_dir
, new_name
);
4098 if (yaffs_is_non_empty_dir(existing_target
)) {
4099 return YAFFS_FAIL
; /* ENOTEMPTY */
4100 } else if (existing_target
&& existing_target
!= obj
) {
4101 /* Nuke the target first, using shadowing,
4102 * but only if it isn't the same object.
4104 * Note we must disable gc here otherwise it can mess
4108 dev
->gc_disable
= 1;
4109 yaffs_change_obj_name(obj
, new_dir
, new_name
, force
,
4110 existing_target
->obj_id
);
4111 existing_target
->is_shadowed
= 1;
4112 yaffs_unlink_obj(existing_target
);
4113 dev
->gc_disable
= 0;
4116 result
= yaffs_change_obj_name(obj
, new_dir
, new_name
, 1, 0);
4118 yaffs_update_parent(old_dir
);
4119 if (new_dir
!= old_dir
)
4120 yaffs_update_parent(new_dir
);
4127 /*----------------------- Initialisation Scanning ---------------------- */
4129 void yaffs_handle_shadowed_obj(struct yaffs_dev
*dev
, int obj_id
,
4130 int backward_scanning
)
4132 struct yaffs_obj
*obj
;
4134 if (backward_scanning
) {
4135 /* Handle YAFFS2 case (backward scanning)
4136 * If the shadowed object exists then ignore.
4138 obj
= yaffs_find_by_number(dev
, obj_id
);
4143 /* Let's create it (if it does not exist) assuming it is a file so that
4144 * it can do shrinking etc.
4145 * We put it in unlinked dir to be cleaned up after the scanning
4148 yaffs_find_or_create_by_number(dev
, obj_id
, YAFFS_OBJECT_TYPE_FILE
);
4151 obj
->is_shadowed
= 1;
4152 yaffs_add_obj_to_dir(dev
->unlinked_dir
, obj
);
4153 obj
->variant
.file_variant
.shrink_size
= 0;
4154 obj
->valid
= 1; /* So that we don't read any other info. */
4157 void yaffs_link_fixup(struct yaffs_dev
*dev
, struct list_head
*hard_list
)
4159 struct list_head
*lh
;
4160 struct list_head
*save
;
4161 struct yaffs_obj
*hl
;
4162 struct yaffs_obj
*in
;
4164 list_for_each_safe(lh
, save
, hard_list
) {
4165 hl
= list_entry(lh
, struct yaffs_obj
, hard_links
);
4166 in
= yaffs_find_by_number(dev
,
4167 hl
->variant
.hardlink_variant
.equiv_id
);
4170 /* Add the hardlink pointers */
4171 hl
->variant
.hardlink_variant
.equiv_obj
= in
;
4172 list_add(&hl
->hard_links
, &in
->hard_links
);
4174 /* Todo Need to report/handle this better.
4175 * Got a problem... hardlink to a non-existant object
4177 hl
->variant
.hardlink_variant
.equiv_obj
= NULL
;
4178 INIT_LIST_HEAD(&hl
->hard_links
);
4183 static void yaffs_strip_deleted_objs(struct yaffs_dev
*dev
)
4186 * Sort out state of unlinked and deleted objects after scanning.
4188 struct list_head
*i
;
4189 struct list_head
*n
;
4190 struct yaffs_obj
*l
;
4195 /* Soft delete all the unlinked files */
4196 list_for_each_safe(i
, n
,
4197 &dev
->unlinked_dir
->variant
.dir_variant
.children
) {
4198 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4202 list_for_each_safe(i
, n
, &dev
->del_dir
->variant
.dir_variant
.children
) {
4203 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4209 * This code iterates through all the objects making sure that they are rooted.
4210 * Any unrooted objects are re-rooted in lost+found.
4211 * An object needs to be in one of:
4212 * - Directly under deleted, unlinked
4213 * - Directly or indirectly under root.
4216 * This code assumes that we don't ever change the current relationships
4217 * between directories:
4218 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4219 * lost-n-found->parent == root_dir
4221 * This fixes the problem where directories might have inadvertently been
4222 * deleted leaving the object "hanging" without being rooted in the
4226 static int yaffs_has_null_parent(struct yaffs_dev
*dev
, struct yaffs_obj
*obj
)
4228 return (obj
== dev
->del_dir
||
4229 obj
== dev
->unlinked_dir
|| obj
== dev
->root_dir
);
4232 static void yaffs_fix_hanging_objs(struct yaffs_dev
*dev
)
4234 struct yaffs_obj
*obj
;
4235 struct yaffs_obj
*parent
;
4237 struct list_head
*lh
;
4238 struct list_head
*n
;
4245 /* Iterate through the objects in each hash entry,
4246 * looking at each object.
4247 * Make sure it is rooted.
4250 for (i
= 0; i
< YAFFS_NOBJECT_BUCKETS
; i
++) {
4251 list_for_each_safe(lh
, n
, &dev
->obj_bucket
[i
].list
) {
4252 obj
= list_entry(lh
, struct yaffs_obj
, hash_link
);
4253 parent
= obj
->parent
;
4255 if (yaffs_has_null_parent(dev
, obj
)) {
4256 /* These directories are not hanging */
4258 } else if (!parent
||
4259 parent
->variant_type
!=
4260 YAFFS_OBJECT_TYPE_DIRECTORY
) {
4262 } else if (yaffs_has_null_parent(dev
, parent
)) {
4266 * Need to follow the parent chain to
4267 * see if it is hanging.
4272 while (parent
!= dev
->root_dir
&&
4274 parent
->parent
->variant_type
==
4275 YAFFS_OBJECT_TYPE_DIRECTORY
&&
4277 parent
= parent
->parent
;
4280 if (parent
!= dev
->root_dir
)
4284 yaffs_trace(YAFFS_TRACE_SCAN
,
4285 "Hanging object %d moved to lost and found",
4287 yaffs_add_obj_to_dir(dev
->lost_n_found
, obj
);
4294 * Delete directory contents for cleaning up lost and found.
4296 static void yaffs_del_dir_contents(struct yaffs_obj
*dir
)
4298 struct yaffs_obj
*obj
;
4299 struct list_head
*lh
;
4300 struct list_head
*n
;
4302 if (dir
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
)
4305 list_for_each_safe(lh
, n
, &dir
->variant
.dir_variant
.children
) {
4306 obj
= list_entry(lh
, struct yaffs_obj
, siblings
);
4307 if (obj
->variant_type
== YAFFS_OBJECT_TYPE_DIRECTORY
)
4308 yaffs_del_dir_contents(obj
);
4309 yaffs_trace(YAFFS_TRACE_SCAN
,
4310 "Deleting lost_found object %d",
4312 yaffs_unlink_obj(obj
);
4316 static void yaffs_empty_l_n_f(struct yaffs_dev
*dev
)
4318 yaffs_del_dir_contents(dev
->lost_n_found
);
4322 struct yaffs_obj
*yaffs_find_by_name(struct yaffs_obj
*directory
,
4326 struct list_head
*i
;
4327 YCHAR buffer
[YAFFS_MAX_NAME_LENGTH
+ 1];
4328 struct yaffs_obj
*l
;
4334 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4335 "tragedy: yaffs_find_by_name: null pointer directory"
4340 if (directory
->variant_type
!= YAFFS_OBJECT_TYPE_DIRECTORY
) {
4341 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4342 "tragedy: yaffs_find_by_name: non-directory"
4347 sum
= yaffs_calc_name_sum(name
);
4349 list_for_each(i
, &directory
->variant
.dir_variant
.children
) {
4350 l
= list_entry(i
, struct yaffs_obj
, siblings
);
4352 if (l
->parent
!= directory
)
4355 yaffs_check_obj_details_loaded(l
);
4357 /* Special case for lost-n-found */
4358 if (l
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4359 if (!yaffs_strcmp(name
, YAFFS_LOSTNFOUND_NAME
))
4361 } else if (l
->sum
== sum
|| l
->hdr_chunk
<= 0) {
4362 /* LostnFound chunk called Objxxx
4365 yaffs_get_obj_name(l
, buffer
,
4366 YAFFS_MAX_NAME_LENGTH
+ 1);
4367 if (!yaffs_strncmp(name
, buffer
, YAFFS_MAX_NAME_LENGTH
))
4374 /* GetEquivalentObject dereferences any hard links to get to the
4378 struct yaffs_obj
*yaffs_get_equivalent_obj(struct yaffs_obj
*obj
)
4380 if (obj
&& obj
->variant_type
== YAFFS_OBJECT_TYPE_HARDLINK
) {
4381 obj
= obj
->variant
.hardlink_variant
.equiv_obj
;
4382 yaffs_check_obj_details_loaded(obj
);
4388 * A note or two on object names.
4389 * * If the object name is missing, we then make one up in the form objnnn
4391 * * ASCII names are stored in the object header's name field from byte zero
4392 * * Unicode names are historically stored starting from byte zero.
4394 * Then there are automatic Unicode names...
4395 * The purpose of these is to save names in a way that can be read as
4396 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4397 * system to share files.
4399 * These automatic unicode are stored slightly differently...
4400 * - If the name can fit in the ASCII character space then they are saved as
4401 * ascii names as per above.
4402 * - If the name needs Unicode then the name is saved in Unicode
4403 * starting at oh->name[1].
4406 static void yaffs_fix_null_name(struct yaffs_obj
*obj
, YCHAR
*name
,
4409 /* Create an object name if we could not find one. */
4410 if (yaffs_strnlen(name
, YAFFS_MAX_NAME_LENGTH
) == 0) {
4411 YCHAR local_name
[20];
4412 YCHAR num_string
[20];
4413 YCHAR
*x
= &num_string
[19];
4414 unsigned v
= obj
->obj_id
;
4418 *x
= '0' + (v
% 10);
4421 /* make up a name */
4422 yaffs_strcpy(local_name
, YAFFS_LOSTNFOUND_PREFIX
);
4423 yaffs_strcat(local_name
, x
);
4424 yaffs_strncpy(name
, local_name
, buffer_size
- 1);
4428 int yaffs_get_obj_name(struct yaffs_obj
*obj
, YCHAR
*name
, int buffer_size
)
4430 memset(name
, 0, buffer_size
* sizeof(YCHAR
));
4431 yaffs_check_obj_details_loaded(obj
);
4432 if (obj
->obj_id
== YAFFS_OBJECTID_LOSTNFOUND
) {
4433 yaffs_strncpy(name
, YAFFS_LOSTNFOUND_NAME
, buffer_size
- 1);
4434 } else if (obj
->short_name
[0]) {
4435 yaffs_strcpy(name
, obj
->short_name
);
4436 } 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 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 yaffs_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 yaffs_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(const struct yaffs_dev
*dev
)
4545 /* Common functions, gotta have */
4546 if (!dev
->param
.erase_fn
|| !dev
->param
.initialise_flash_fn
)
4549 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
4550 if (dev
->param
.write_chunk_tags_fn
&&
4551 dev
->param
.read_chunk_tags_fn
&&
4552 !dev
->param
.write_chunk_fn
&&
4553 !dev
->param
.read_chunk_fn
&&
4554 dev
->param
.bad_block_fn
&& dev
->param
.query_block_fn
)
4557 /* Can use the "spare" style interface for yaffs1 */
4558 if (!dev
->param
.is_yaffs2
&&
4559 !dev
->param
.write_chunk_tags_fn
&&
4560 !dev
->param
.read_chunk_tags_fn
&&
4561 dev
->param
.write_chunk_fn
&&
4562 dev
->param
.read_chunk_fn
&&
4563 !dev
->param
.bad_block_fn
&& !dev
->param
.query_block_fn
)
4569 static int yaffs_create_initial_dir(struct yaffs_dev
*dev
)
4571 /* Initialise the unlinked, deleted, root and lost+found directories */
4572 dev
->lost_n_found
= dev
->root_dir
= NULL
;
4573 dev
->unlinked_dir
= dev
->del_dir
= NULL
;
4575 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_UNLINKED
, S_IFDIR
);
4577 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_DELETED
, S_IFDIR
);
4579 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_ROOT
,
4580 YAFFS_ROOT_MODE
| S_IFDIR
);
4582 yaffs_create_fake_dir(dev
, YAFFS_OBJECTID_LOSTNFOUND
,
4583 YAFFS_LOSTNFOUND_MODE
| S_IFDIR
);
4585 if (dev
->lost_n_found
&& dev
->root_dir
&& dev
->unlinked_dir
4587 yaffs_add_obj_to_dir(dev
->root_dir
, dev
->lost_n_found
);
4593 int yaffs_guts_initialise(struct yaffs_dev
*dev
)
4595 int init_failed
= 0;
4599 yaffs_trace(YAFFS_TRACE_TRACING
, "yaffs: yaffs_guts_initialise()");
4601 /* Check stuff that must be set */
4604 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4605 "yaffs: Need a device"
4610 if (dev
->is_mounted
) {
4611 yaffs_trace(YAFFS_TRACE_ALWAYS
, "device already mounted");
4615 dev
->internal_start_block
= dev
->param
.start_block
;
4616 dev
->internal_end_block
= dev
->param
.end_block
;
4617 dev
->block_offset
= 0;
4618 dev
->chunk_offset
= 0;
4619 dev
->n_free_chunks
= 0;
4623 if (dev
->param
.start_block
== 0) {
4624 dev
->internal_start_block
= dev
->param
.start_block
+ 1;
4625 dev
->internal_end_block
= dev
->param
.end_block
+ 1;
4626 dev
->block_offset
= 1;
4627 dev
->chunk_offset
= dev
->param
.chunks_per_block
;
4630 /* Check geometry parameters. */
4632 if ((!dev
->param
.inband_tags
&& dev
->param
.is_yaffs2
&&
4633 dev
->param
.total_bytes_per_chunk
< 1024) ||
4634 (!dev
->param
.is_yaffs2
&&
4635 dev
->param
.total_bytes_per_chunk
< 512) ||
4636 (dev
->param
.inband_tags
&& !dev
->param
.is_yaffs2
) ||
4637 dev
->param
.chunks_per_block
< 2 ||
4638 dev
->param
.n_reserved_blocks
< 2 ||
4639 dev
->internal_start_block
<= 0 ||
4640 dev
->internal_end_block
<= 0 ||
4641 dev
->internal_end_block
<=
4642 (dev
->internal_start_block
+ dev
->param
.n_reserved_blocks
+ 2)
4644 /* otherwise it is too small */
4645 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4646 "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4647 dev
->param
.total_bytes_per_chunk
,
4648 dev
->param
.is_yaffs2
? "2" : "",
4649 dev
->param
.inband_tags
);
4653 if (yaffs_init_nand(dev
) != YAFFS_OK
) {
4654 yaffs_trace(YAFFS_TRACE_ALWAYS
, "InitialiseNAND failed");
4658 /* Sort out space for inband tags, if required */
4659 if (dev
->param
.inband_tags
)
4660 dev
->data_bytes_per_chunk
=
4661 dev
->param
.total_bytes_per_chunk
-
4662 sizeof(struct yaffs_packed_tags2_tags_only
);
4664 dev
->data_bytes_per_chunk
= dev
->param
.total_bytes_per_chunk
;
4666 /* Got the right mix of functions? */
4667 if (!yaffs_check_dev_fns(dev
)) {
4668 /* Function missing */
4669 yaffs_trace(YAFFS_TRACE_ALWAYS
,
4670 "device function(s) missing or wrong");
4675 /* Finished with most checks. Further checks happen later on too. */
4677 dev
->is_mounted
= 1;
4679 /* OK now calculate a few things for the device */
4682 * Calculate all the chunk size manipulation numbers:
4684 x
= dev
->data_bytes_per_chunk
;
4685 /* We always use dev->chunk_shift and dev->chunk_div */
4686 dev
->chunk_shift
= calc_shifts(x
);
4687 x
>>= dev
->chunk_shift
;
4689 /* We only use chunk mask if chunk_div is 1 */
4690 dev
->chunk_mask
= (1 << dev
->chunk_shift
) - 1;
4693 * Calculate chunk_grp_bits.
4694 * We need to find the next power of 2 > than internal_end_block
4697 x
= dev
->param
.chunks_per_block
* (dev
->internal_end_block
+ 1);
4699 bits
= calc_shifts_ceiling(x
);
4701 /* Set up tnode width if wide tnodes are enabled. */
4702 if (!dev
->param
.wide_tnodes_disabled
) {
4703 /* bits must be even so that we end up with 32-bit words */
4707 dev
->tnode_width
= 16;
4709 dev
->tnode_width
= bits
;
4711 dev
->tnode_width
= 16;
4714 dev
->tnode_mask
= (1 << dev
->tnode_width
) - 1;
4716 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4717 * so if the bitwidth of the
4718 * chunk range we're using is greater than 16 we need
4719 * to figure out chunk shift and chunk_grp_size
4722 if (bits
<= dev
->tnode_width
)
4723 dev
->chunk_grp_bits
= 0;
4725 dev
->chunk_grp_bits
= bits
- dev
->tnode_width
;
4727 dev
->tnode_size
= (dev
->tnode_width
* YAFFS_NTNODES_LEVEL0
) / 8;
4728 if (dev
->tnode_size
< sizeof(struct yaffs_tnode
))
4729 dev
->tnode_size
= sizeof(struct yaffs_tnode
);
4731 dev
->chunk_grp_size
= 1 << dev
->chunk_grp_bits
;
4733 if (dev
->param
.chunks_per_block
< dev
->chunk_grp_size
) {
4734 /* We have a problem because the soft delete won't work if
4735 * the chunk group size > chunks per block.
4736 * This can be remedied by using larger "virtual blocks".
4738 yaffs_trace(YAFFS_TRACE_ALWAYS
, "chunk group too large");
4743 /* Finished verifying the device, continue with initialisation */
4745 /* More device initialisation */
4747 dev
->passive_gc_count
= 0;
4748 dev
->oldest_dirty_gc_count
= 0;
4750 dev
->gc_block_finder
= 0;
4751 dev
->buffered_block
= -1;
4752 dev
->doing_buffered_block_rewrite
= 0;
4753 dev
->n_deleted_files
= 0;
4754 dev
->n_bg_deletions
= 0;
4755 dev
->n_unlinked_files
= 0;
4756 dev
->n_ecc_fixed
= 0;
4757 dev
->n_ecc_unfixed
= 0;
4758 dev
->n_tags_ecc_fixed
= 0;
4759 dev
->n_tags_ecc_unfixed
= 0;
4760 dev
->n_erase_failures
= 0;
4761 dev
->n_erased_blocks
= 0;
4762 dev
->gc_disable
= 0;
4763 dev
->has_pending_prioritised_gc
= 1;
4764 /* Assume the worst for now, will get fixed on first GC */
4765 INIT_LIST_HEAD(&dev
->dirty_dirs
);
4766 dev
->oldest_dirty_seq
= 0;
4767 dev
->oldest_dirty_block
= 0;
4769 /* Initialise temporary buffers and caches. */
4770 if (!yaffs_init_tmp_buffers(dev
))
4774 dev
->gc_cleanup_list
= NULL
;
4776 if (!init_failed
&& dev
->param
.n_caches
> 0) {
4780 dev
->param
.n_caches
* sizeof(struct yaffs_cache
);
4782 if (dev
->param
.n_caches
> YAFFS_MAX_SHORT_OP_CACHES
)
4783 dev
->param
.n_caches
= YAFFS_MAX_SHORT_OP_CACHES
;
4785 dev
->cache
= kmalloc(cache_bytes
, GFP_NOFS
);
4787 buf
= (u8
*) dev
->cache
;
4790 memset(dev
->cache
, 0, cache_bytes
);
4792 for (i
= 0; i
< dev
->param
.n_caches
&& buf
; i
++) {
4793 dev
->cache
[i
].object
= NULL
;
4794 dev
->cache
[i
].last_use
= 0;
4795 dev
->cache
[i
].dirty
= 0;
4796 dev
->cache
[i
].data
= buf
=
4797 kmalloc(dev
->param
.total_bytes_per_chunk
, GFP_NOFS
);
4802 dev
->cache_last_use
= 0;
4805 dev
->cache_hits
= 0;
4808 dev
->gc_cleanup_list
=
4809 kmalloc(dev
->param
.chunks_per_block
* sizeof(u32
),
4811 if (!dev
->gc_cleanup_list
)
4815 if (dev
->param
.is_yaffs2
)
4816 dev
->param
.use_header_file_size
= 1;
4818 if (!init_failed
&& !yaffs_init_blocks(dev
))
4821 yaffs_init_tnodes_and_objs(dev
);
4823 if (!init_failed
&& !yaffs_create_initial_dir(dev
))
4826 if (!init_failed
&& dev
->param
.is_yaffs2
&&
4827 !dev
->param
.disable_summary
&&
4828 !yaffs_summary_init(dev
))
4832 /* Now scan the flash. */
4833 if (dev
->param
.is_yaffs2
) {
4834 if (yaffs2_checkpt_restore(dev
)) {
4835 yaffs_check_obj_details_loaded(dev
->root_dir
);
4836 yaffs_trace(YAFFS_TRACE_CHECKPOINT
|
4838 "yaffs: restored from checkpoint"
4842 /* Clean up the mess caused by an aborted
4843 * checkpoint load then scan backwards.
4845 yaffs_deinit_blocks(dev
);
4847 yaffs_deinit_tnodes_and_objs(dev
);
4849 dev
->n_erased_blocks
= 0;
4850 dev
->n_free_chunks
= 0;
4851 dev
->alloc_block
= -1;
4852 dev
->alloc_page
= -1;
4853 dev
->n_deleted_files
= 0;
4854 dev
->n_unlinked_files
= 0;
4855 dev
->n_bg_deletions
= 0;
4857 if (!init_failed
&& !yaffs_init_blocks(dev
))
4860 yaffs_init_tnodes_and_objs(dev
);
4863 && !yaffs_create_initial_dir(dev
))
4866 if (!init_failed
&& !yaffs2_scan_backwards(dev
))
4869 } else if (!yaffs1_scan(dev
)) {
4873 yaffs_strip_deleted_objs(dev
);
4874 yaffs_fix_hanging_objs(dev
);
4875 if (dev
->param
.empty_lost_n_found
)
4876 yaffs_empty_l_n_f(dev
);
4880 /* Clean up the mess */
4881 yaffs_trace(YAFFS_TRACE_TRACING
,
4882 "yaffs: yaffs_guts_initialise() aborted.");
4884 yaffs_deinitialise(dev
);
4888 /* Zero out stats */
4889 dev
->n_page_reads
= 0;
4890 dev
->n_page_writes
= 0;
4891 dev
->n_erasures
= 0;
4892 dev
->n_gc_copies
= 0;
4893 dev
->n_retried_writes
= 0;
4895 dev
->n_retired_blocks
= 0;
4897 yaffs_verify_free_chunks(dev
);
4898 yaffs_verify_blocks(dev
);
4900 /* Clean up any aborted checkpoint data */
4901 if (!dev
->is_checkpointed
&& dev
->blocks_in_checkpt
> 0)
4902 yaffs2_checkpt_invalidate(dev
);
4904 yaffs_trace(YAFFS_TRACE_TRACING
,
4905 "yaffs: yaffs_guts_initialise() done.");
4909 void yaffs_deinitialise(struct yaffs_dev
*dev
)
4911 if (dev
->is_mounted
) {
4914 yaffs_deinit_blocks(dev
);
4915 yaffs_deinit_tnodes_and_objs(dev
);
4916 yaffs_summary_deinit(dev
);
4918 if (dev
->param
.n_caches
> 0 && dev
->cache
) {
4920 for (i
= 0; i
< dev
->param
.n_caches
; i
++) {
4921 kfree(dev
->cache
[i
].data
);
4922 dev
->cache
[i
].data
= NULL
;
4929 kfree(dev
->gc_cleanup_list
);
4931 for (i
= 0; i
< YAFFS_N_TEMP_BUFFERS
; i
++)
4932 kfree(dev
->temp_buffer
[i
].buffer
);
4934 dev
->is_mounted
= 0;
4936 if (dev
->param
.deinitialise_flash_fn
)
4937 dev
->param
.deinitialise_flash_fn(dev
);
4941 int yaffs_count_free_chunks(struct yaffs_dev
*dev
)
4945 struct yaffs_block_info
*blk
;
4947 blk
= dev
->block_info
;
4948 for (b
= dev
->internal_start_block
; b
<= dev
->internal_end_block
; b
++) {
4949 switch (blk
->block_state
) {
4950 case YAFFS_BLOCK_STATE_EMPTY
:
4951 case YAFFS_BLOCK_STATE_ALLOCATING
:
4952 case YAFFS_BLOCK_STATE_COLLECTING
:
4953 case YAFFS_BLOCK_STATE_FULL
:
4955 (dev
->param
.chunks_per_block
- blk
->pages_in_use
+
4956 blk
->soft_del_pages
);
4966 int yaffs_get_n_free_chunks(struct yaffs_dev
*dev
)
4968 /* This is what we report to the outside world */
4971 int blocks_for_checkpt
;
4974 n_free
= dev
->n_free_chunks
;
4975 n_free
+= dev
->n_deleted_files
;
4977 /* Now count and subtract the number of dirty chunks in the cache. */
4979 for (n_dirty_caches
= 0, i
= 0; i
< dev
->param
.n_caches
; i
++) {
4980 if (dev
->cache
[i
].dirty
)
4984 n_free
-= n_dirty_caches
;
4987 ((dev
->param
.n_reserved_blocks
+ 1) * dev
->param
.chunks_per_block
);
4989 /* Now figure checkpoint space and report that... */
4990 blocks_for_checkpt
= yaffs_calc_checkpt_blocks_required(dev
);
4992 n_free
-= (blocks_for_checkpt
* dev
->param
.chunks_per_block
);
5001 * Marshalling functions to get loff_t file sizes into aand out of
5004 void yaffs_oh_size_load(struct yaffs_obj_hdr
*oh
, loff_t fsize
)
5006 oh
->file_size_low
= (fsize
& 0xFFFFFFFF);
5007 oh
->file_size_high
= ((fsize
>> 32) & 0xFFFFFFFF);
5010 loff_t
yaffs_oh_to_size(struct yaffs_obj_hdr
*oh
)
5014 if (~(oh
->file_size_high
))
5015 retval
= (((loff_t
) oh
->file_size_high
) << 32) |
5016 (((loff_t
) oh
->file_size_low
) & 0xFFFFFFFF);
5018 retval
= (loff_t
) oh
->file_size_low
;