diff options
Diffstat (limited to 'target/linux/generic/files/fs/yaffs2/yaffs_guts.c')
| -rw-r--r-- | target/linux/generic/files/fs/yaffs2/yaffs_guts.c | 5544 |
1 files changed, 5544 insertions, 0 deletions
diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_guts.c b/target/linux/generic/files/fs/yaffs2/yaffs_guts.c new file mode 100644 index 0000000..36e11f5 --- /dev/null +++ b/target/linux/generic/files/fs/yaffs2/yaffs_guts.c @@ -0,0 +1,5544 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2010 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include "yportenv.h" +#include "yaffs_trace.h" + +#include "yaffsinterface.h" +#include "yaffs_guts.h" +#include "yaffs_tagsvalidity.h" +#include "yaffs_getblockinfo.h" + +#include "yaffs_tagscompat.h" + +#include "yaffs_nand.h" + +#include "yaffs_yaffs1.h" +#include "yaffs_yaffs2.h" +#include "yaffs_bitmap.h" +#include "yaffs_verify.h" + +#include "yaffs_nand.h" +#include "yaffs_packedtags2.h" + +#include "yaffs_nameval.h" +#include "yaffs_allocator.h" + +/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */ +#define YAFFS_GC_GOOD_ENOUGH 2 +#define YAFFS_GC_PASSIVE_THRESHOLD 4 + +#include "yaffs_ecc.h" + + + +/* Robustification (if it ever comes about...) */ +static void yaffs_retire_block(yaffs_dev_t *dev, int flash_block); +static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk, + int erasedOk); +static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk, + const __u8 *data, + const yaffs_ext_tags *tags); +static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk, + const yaffs_ext_tags *tags); + +/* Other local prototypes */ +static void yaffs_update_parent(yaffs_obj_t *obj); +static int yaffs_unlink_obj(yaffs_obj_t *obj); +static int yaffs_obj_cache_dirty(yaffs_obj_t *obj); + +static int yaffs_write_new_chunk(yaffs_dev_t *dev, + const __u8 *buffer, + yaffs_ext_tags *tags, + int useReserve); + + +static yaffs_obj_t *yaffs_new_obj(yaffs_dev_t *dev, int number, + yaffs_obj_type type); + + +static int yaffs_apply_xattrib_mod(yaffs_obj_t *obj, char *buffer, yaffs_xattr_mod *xmod); + +static void yaffs_remove_obj_from_dir(yaffs_obj_t *obj); +static int yaffs_check_structures(void); +static int yaffs_generic_obj_del(yaffs_obj_t *in); + +static int yaffs_check_chunk_erased(struct yaffs_dev_s *dev, + int nand_chunk); + +static int yaffs_unlink_worker(yaffs_obj_t *obj); + +static int yaffs_tags_match(const yaffs_ext_tags *tags, int obj_id, + int chunkInObject); + +static int yaffs_alloc_chunk(yaffs_dev_t *dev, int useReserve, + yaffs_block_info_t **blockUsedPtr); + +static void yaffs_check_obj_details_loaded(yaffs_obj_t *in); + +static void yaffs_invalidate_whole_cache(yaffs_obj_t *in); +static void yaffs_invalidate_chunk_cache(yaffs_obj_t *object, int chunk_id); + +static int yaffs_find_chunk_in_file(yaffs_obj_t *in, int inode_chunk, + yaffs_ext_tags *tags); + +static int yaffs_verify_chunk_written(yaffs_dev_t *dev, + int nand_chunk, + const __u8 *data, + yaffs_ext_tags *tags); + + +static void yaffs_load_name_from_oh(yaffs_dev_t *dev,YCHAR *name, const YCHAR *ohName, int bufferSize); +static void yaffs_load_oh_from_name(yaffs_dev_t *dev,YCHAR *ohName, const YCHAR *name); + + +/* Function to calculate chunk and offset */ + +static void yaffs_addr_to_chunk(yaffs_dev_t *dev, loff_t addr, int *chunkOut, + __u32 *offsetOut) +{ + int chunk; + __u32 offset; + + chunk = (__u32)(addr >> dev->chunk_shift); + + if (dev->chunk_div == 1) { + /* easy power of 2 case */ + offset = (__u32)(addr & dev->chunk_mask); + } else { + /* Non power-of-2 case */ + + loff_t chunkBase; + + chunk /= dev->chunk_div; + + chunkBase = ((loff_t)chunk) * dev->data_bytes_per_chunk; + offset = (__u32)(addr - chunkBase); + } + + *chunkOut = chunk; + *offsetOut = offset; +} + +/* Function to return the number of shifts for a power of 2 greater than or + * equal to the given number + * Note we don't try to cater for all possible numbers and this does not have to + * be hellishly efficient. + */ + +static __u32 ShiftsGE(__u32 x) +{ + int extraBits; + int nShifts; + + nShifts = extraBits = 0; + + while (x > 1) { + if (x & 1) + extraBits++; + x >>= 1; + nShifts++; + } + + if (extraBits) + nShifts++; + + return nShifts; +} + +/* Function to return the number of shifts to get a 1 in bit 0 + */ + +static __u32 Shifts(__u32 x) +{ + __u32 nShifts; + + nShifts = 0; + + if (!x) + return 0; + + while (!(x&1)) { + x >>= 1; + nShifts++; + } + + return nShifts; +} + + + +/* + * Temporary buffer manipulations. + */ + +static int yaffs_init_tmp_buffers(yaffs_dev_t *dev) +{ + int i; + __u8 *buf = (__u8 *)1; + + memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer)); + + for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) { + dev->temp_buffer[i].line = 0; /* not in use */ + dev->temp_buffer[i].buffer = buf = + YMALLOC_DMA(dev->param.total_bytes_per_chunk); + } + + return buf ? YAFFS_OK : YAFFS_FAIL; +} + +__u8 *yaffs_get_temp_buffer(yaffs_dev_t *dev, int line_no) +{ + int i, j; + + dev->temp_in_use++; + if (dev->temp_in_use > dev->max_temp) + dev->max_temp = dev->temp_in_use; + + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { + if (dev->temp_buffer[i].line == 0) { + dev->temp_buffer[i].line = line_no; + if ((i + 1) > dev->max_temp) { + dev->max_temp = i + 1; + for (j = 0; j <= i; j++) + dev->temp_buffer[j].max_line = + dev->temp_buffer[j].line; + } + + return dev->temp_buffer[i].buffer; + } + } + + T(YAFFS_TRACE_BUFFERS, + (TSTR("Out of temp buffers at line %d, other held by lines:"), + line_no)); + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) + T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->temp_buffer[i].line)); + + T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR))); + + /* + * If we got here then we have to allocate an unmanaged one + * This is not good. + */ + + dev->unmanaged_buffer_allocs++; + return YMALLOC(dev->data_bytes_per_chunk); + +} + +void yaffs_release_temp_buffer(yaffs_dev_t *dev, __u8 *buffer, + int line_no) +{ + int i; + + dev->temp_in_use--; + + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { + if (dev->temp_buffer[i].buffer == buffer) { + dev->temp_buffer[i].line = 0; + return; + } + } + + if (buffer) { + /* assume it is an unmanaged one. */ + T(YAFFS_TRACE_BUFFERS, + (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR), + line_no)); + YFREE(buffer); + dev->unmanaged_buffer_deallocs++; + } + +} + +/* + * Determine if we have a managed buffer. + */ +int yaffs_is_managed_tmp_buffer(yaffs_dev_t *dev, const __u8 *buffer) +{ + int i; + + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { + if (dev->temp_buffer[i].buffer == buffer) + return 1; + } + + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].data == buffer) + return 1; + } + + if (buffer == dev->checkpt_buffer) + return 1; + + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR))); + return 0; +} + +/* + * Verification code + */ + + + + +/* + * Simple hash function. Needs to have a reasonable spread + */ + +static Y_INLINE int yaffs_hash_fn(int n) +{ + n = abs(n); + return n % YAFFS_NOBJECT_BUCKETS; +} + +/* + * Access functions to useful fake objects. + * Note that root might have a presence in NAND if permissions are set. + */ + +yaffs_obj_t *yaffs_root(yaffs_dev_t *dev) +{ + return dev->root_dir; +} + +yaffs_obj_t *yaffs_lost_n_found(yaffs_dev_t *dev) +{ + return dev->lost_n_found; +} + + +/* + * Erased NAND checking functions + */ + +int yaffs_check_ff(__u8 *buffer, int n_bytes) +{ + /* Horrible, slow implementation */ + while (n_bytes--) { + if (*buffer != 0xFF) + return 0; + buffer++; + } + return 1; +} + +static int yaffs_check_chunk_erased(struct yaffs_dev_s *dev, + int nand_chunk) +{ + int retval = YAFFS_OK; + __u8 *data = yaffs_get_temp_buffer(dev, __LINE__); + yaffs_ext_tags tags; + int result; + + result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags); + + if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR) + retval = YAFFS_FAIL; + + if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || tags.chunk_used) { + T(YAFFS_TRACE_NANDACCESS, + (TSTR("Chunk %d not erased" TENDSTR), nand_chunk)); + retval = YAFFS_FAIL; + } + + yaffs_release_temp_buffer(dev, data, __LINE__); + + return retval; + +} + + +static int yaffs_verify_chunk_written(yaffs_dev_t *dev, + int nand_chunk, + const __u8 *data, + yaffs_ext_tags *tags) +{ + int retval = YAFFS_OK; + yaffs_ext_tags tempTags; + __u8 *buffer = yaffs_get_temp_buffer(dev,__LINE__); + int result; + + result = yaffs_rd_chunk_tags_nand(dev,nand_chunk,buffer,&tempTags); + if(memcmp(buffer,data,dev->data_bytes_per_chunk) || + tempTags.obj_id != tags->obj_id || + tempTags.chunk_id != tags->chunk_id || + tempTags.n_bytes != tags->n_bytes) + retval = YAFFS_FAIL; + + yaffs_release_temp_buffer(dev, buffer, __LINE__); + + return retval; +} + +static int yaffs_write_new_chunk(struct yaffs_dev_s *dev, + const __u8 *data, + yaffs_ext_tags *tags, + int useReserve) +{ + int attempts = 0; + int writeOk = 0; + int chunk; + + yaffs2_checkpt_invalidate(dev); + + do { + yaffs_block_info_t *bi = 0; + int erasedOk = 0; + + chunk = yaffs_alloc_chunk(dev, useReserve, &bi); + if (chunk < 0) { + /* no space */ + break; + } + + /* First check this chunk is erased, if it needs + * checking. The checking policy (unless forced + * always on) is as follows: + * + * Check the first page we try to write in a block. + * If the check passes then we don't need to check any + * more. If the check fails, we check again... + * If the block has been erased, we don't need to check. + * + * However, if the block has been prioritised for gc, + * then we think there might be something odd about + * this block and stop using it. + * + * Rationale: We should only ever see chunks that have + * not been erased if there was a partially written + * chunk due to power loss. This checking policy should + * catch that case with very few checks and thus save a + * lot of checks that are most likely not needed. + * + * Mods to the above + * If an erase check fails or the write fails we skip the + * rest of the block. + */ + + /* let's give it a try */ + attempts++; + + if(dev->param.always_check_erased) + bi->skip_erased_check = 0; + + if (!bi->skip_erased_check) { + erasedOk = yaffs_check_chunk_erased(dev, chunk); + if (erasedOk != YAFFS_OK) { + T(YAFFS_TRACE_ERROR, + (TSTR("**>> yaffs chunk %d was not erased" + TENDSTR), chunk)); + + /* If not erased, delete this one, + * skip rest of block and + * try another chunk */ + yaffs_chunk_del(dev,chunk,1,__LINE__); + yaffs_skip_rest_of_block(dev); + continue; + } + } + + writeOk = yaffs_wr_chunk_tags_nand(dev, chunk, + data, tags); + + if(!bi->skip_erased_check) + writeOk = yaffs_verify_chunk_written(dev, chunk, data, tags); + + if (writeOk != YAFFS_OK) { + /* Clean up aborted write, skip to next block and + * try another chunk */ + yaffs_handle_chunk_wr_error(dev, chunk, erasedOk); + continue; + } + + bi->skip_erased_check = 1; + + /* Copy the data into the robustification buffer */ + yaffs_handle_chunk_wr_ok(dev, chunk, data, tags); + + } while (writeOk != YAFFS_OK && + (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts)); + + if (!writeOk) + chunk = -1; + + if (attempts > 1) { + T(YAFFS_TRACE_ERROR, + (TSTR("**>> yaffs write required %d attempts" TENDSTR), + attempts)); + + dev->n_retired_writes += (attempts - 1); + } + + return chunk; +} + + + +/* + * Block retiring for handling a broken block. + */ + +static void yaffs_retire_block(yaffs_dev_t *dev, int flash_block) +{ + yaffs_block_info_t *bi = yaffs_get_block_info(dev, flash_block); + + yaffs2_checkpt_invalidate(dev); + + yaffs2_clear_oldest_dirty_seq(dev,bi); + + if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) { + if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) { + T(YAFFS_TRACE_ALWAYS, (TSTR( + "yaffs: Failed to mark bad and erase block %d" + TENDSTR), flash_block)); + } else { + yaffs_ext_tags tags; + int chunk_id = flash_block * dev->param.chunks_per_block; + + __u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__); + + memset(buffer, 0xff, dev->data_bytes_per_chunk); + yaffs_init_tags(&tags); + tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK; + if (dev->param.write_chunk_tags_fn(dev, chunk_id - + dev->chunk_offset, buffer, &tags) != YAFFS_OK) + T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to " + TCONT("write bad block marker to block %d") + TENDSTR), flash_block)); + + yaffs_release_temp_buffer(dev, buffer, __LINE__); + } + } + + bi->block_state = YAFFS_BLOCK_STATE_DEAD; + bi->gc_prioritise = 0; + bi->needs_retiring = 0; + + dev->n_retired_blocks++; +} + +/* + * Functions for robustisizing TODO + * + */ + +static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk, + const __u8 *data, + const yaffs_ext_tags *tags) +{ + dev=dev; + nand_chunk=nand_chunk; + data=data; + tags=tags; +} + +static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk, + const yaffs_ext_tags *tags) +{ + dev=dev; + nand_chunk=nand_chunk; + tags=tags; +} + +void yaffs_handle_chunk_error(yaffs_dev_t *dev, yaffs_block_info_t *bi) +{ + if (!bi->gc_prioritise) { + bi->gc_prioritise = 1; + dev->has_pending_prioritised_gc = 1; + bi->chunk_error_strikes++; + + if (bi->chunk_error_strikes > 3) { + bi->needs_retiring = 1; /* Too many stikes, so retire this */ + T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR))); + + } + } +} + +static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk, + int erasedOk) +{ + int flash_block = nand_chunk / dev->param.chunks_per_block; + yaffs_block_info_t *bi = yaffs_get_block_info(dev, flash_block); + + yaffs_handle_chunk_error(dev, bi); + + if (erasedOk) { + /* Was an actual write failure, so mark the block for retirement */ + bi->needs_retiring = 1; + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block)); + } + + /* Delete the chunk */ + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + yaffs_skip_rest_of_block(dev); +} + + +/*---------------- Name handling functions ------------*/ + +static __u16 yaffs_calc_name_sum(const YCHAR *name) +{ + __u16 sum = 0; + __u16 i = 1; + + const YUCHAR *bname = (const YUCHAR *) name; + if (bname) { + while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) { + +#ifdef CONFIG_YAFFS_CASE_INSENSITIVE + sum += yaffs_toupper(*bname) * i; +#else + sum += (*bname) * i; +#endif + i++; + bname++; + } + } + return sum; +} + +void yaffs_set_obj_name(yaffs_obj_t *obj, const YCHAR *name) +{ +#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM + memset(obj->short_name, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1)); + if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH) + yaffs_strcpy(obj->short_name, name); + else + obj->short_name[0] = _Y('\0'); +#endif + obj->sum = yaffs_calc_name_sum(name); +} + +void yaffs_set_obj_name_from_oh(yaffs_obj_t *obj, const yaffs_obj_header *oh) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1]; + memset(tmpName,0,sizeof(tmpName)); + yaffs_load_name_from_oh(obj->my_dev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1); + yaffs_set_obj_name(obj,tmpName); +#else + yaffs_set_obj_name(obj,oh->name); +#endif +} + +/*-------------------- TNODES ------------------- + + * List of spare tnodes + * The list is hooked together using the first pointer + * in the tnode. + */ + + +yaffs_tnode_t *yaffs_get_tnode(yaffs_dev_t *dev) +{ + yaffs_tnode_t *tn = yaffs_alloc_raw_tnode(dev); + if (tn){ + memset(tn, 0, dev->tnode_size); + dev->n_tnodes++; + } + + dev->checkpoint_blocks_required = 0; /* force recalculation*/ + + return tn; +} + +/* FreeTnode frees up a tnode and puts it back on the free list */ +static void yaffs_free_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn) +{ + yaffs_free_raw_tnode(dev,tn); + dev->n_tnodes--; + dev->checkpoint_blocks_required = 0; /* force recalculation*/ +} + +static void yaffs_deinit_tnodes_and_objs(yaffs_dev_t *dev) +{ + yaffs_deinit_raw_tnodes_and_objs(dev); + dev->n_obj = 0; + dev->n_tnodes = 0; +} + + +void yaffs_load_tnode_0(yaffs_dev_t *dev, yaffs_tnode_t *tn, unsigned pos, + unsigned val) +{ + __u32 *map = (__u32 *)tn; + __u32 bitInMap; + __u32 bitInWord; + __u32 wordInMap; + __u32 mask; + + pos &= YAFFS_TNODES_LEVEL0_MASK; + val >>= dev->chunk_grp_bits; + + bitInMap = pos * dev->tnode_width; + wordInMap = bitInMap / 32; + bitInWord = bitInMap & (32 - 1); + + mask = dev->tnode_mask << bitInWord; + + map[wordInMap] &= ~mask; + map[wordInMap] |= (mask & (val << bitInWord)); + + if (dev->tnode_width > (32 - bitInWord)) { + bitInWord = (32 - bitInWord); + wordInMap++;; + mask = dev->tnode_mask >> (/*dev->tnode_width -*/ bitInWord); + map[wordInMap] &= ~mask; + map[wordInMap] |= (mask & (val >> bitInWord)); + } +} + +__u32 yaffs_get_group_base(yaffs_dev_t *dev, yaffs_tnode_t *tn, + unsigned pos) +{ + __u32 *map = (__u32 *)tn; + __u32 bitInMap; + __u32 bitInWord; + __u32 wordInMap; + __u32 val; + + pos &= YAFFS_TNODES_LEVEL0_MASK; + + bitInMap = pos * dev->tnode_width; + wordInMap = bitInMap / 32; + bitInWord = bitInMap & (32 - 1); + + val = map[wordInMap] >> bitInWord; + + if (dev->tnode_width > (32 - bitInWord)) { + bitInWord = (32 - bitInWord); + wordInMap++;; + val |= (map[wordInMap] << bitInWord); + } + + val &= dev->tnode_mask; + val <<= dev->chunk_grp_bits; + + return val; +} + +/* ------------------- End of individual tnode manipulation -----------------*/ + +/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------ + * The look up tree is represented by the top tnode and the number of top_level + * in the tree. 0 means only the level 0 tnode is in the tree. + */ + +/* FindLevel0Tnode finds the level 0 tnode, if one exists. */ +yaffs_tnode_t *yaffs_find_tnode_0(yaffs_dev_t *dev, + yaffs_file_s *file_struct, + __u32 chunk_id) +{ + yaffs_tnode_t *tn = file_struct->top; + __u32 i; + int requiredTallness; + int level = file_struct->top_level; + + dev=dev; + + /* Check sane level and chunk Id */ + if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) + return NULL; + + if (chunk_id > YAFFS_MAX_CHUNK_ID) + return NULL; + + /* First check we're tall enough (ie enough top_level) */ + + i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; + requiredTallness = 0; + while (i) { + i >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; + } + + if (requiredTallness > file_struct->top_level) + return NULL; /* Not tall enough, so we can't find it */ + + /* Traverse down to level 0 */ + while (level > 0 && tn) { + tn = tn->internal[(chunk_id >> + (YAFFS_TNODES_LEVEL0_BITS + + (level - 1) * + YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK]; + level--; + } + + return tn; +} + +/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree. + * This happens in two steps: + * 1. If the tree isn't tall enough, then make it taller. + * 2. Scan down the tree towards the level 0 tnode adding tnodes if required. + * + * Used when modifying the tree. + * + * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will + * be plugged into the ttree. + */ + +yaffs_tnode_t *yaffs_add_find_tnode_0(yaffs_dev_t *dev, + yaffs_file_s *file_struct, + __u32 chunk_id, + yaffs_tnode_t *passed_tn) +{ + int requiredTallness; + int i; + int l; + yaffs_tnode_t *tn; + + __u32 x; + + + /* Check sane level and page Id */ + if (file_struct->top_level < 0 || file_struct->top_level > YAFFS_TNODES_MAX_LEVEL) + return NULL; + + if (chunk_id > YAFFS_MAX_CHUNK_ID) + return NULL; + + /* First check we're tall enough (ie enough top_level) */ + + x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; + requiredTallness = 0; + while (x) { + x >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; + } + + + if (requiredTallness > file_struct->top_level) { + /* Not tall enough, gotta make the tree taller */ + for (i = file_struct->top_level; i < requiredTallness; i++) { + + tn = yaffs_get_tnode(dev); + + if (tn) { + tn->internal[0] = file_struct->top; + file_struct->top = tn; + file_struct->top_level++; + } else { + T(YAFFS_TRACE_ERROR, + (TSTR("yaffs: no more tnodes" TENDSTR))); + return NULL; + } + } + } + + /* Traverse down to level 0, adding anything we need */ + + l = file_struct->top_level; + tn = file_struct->top; + + if (l > 0) { + while (l > 0 && tn) { + x = (chunk_id >> + (YAFFS_TNODES_LEVEL0_BITS + + (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK; + + + if ((l > 1) && !tn->internal[x]) { + /* Add missing non-level-zero tnode */ + tn->internal[x] = yaffs_get_tnode(dev); + if(!tn->internal[x]) + return NULL; + } else if (l == 1) { + /* Looking from level 1 at level 0 */ + if (passed_tn) { + /* If we already have one, then release it.*/ + if (tn->internal[x]) + yaffs_free_tnode(dev, tn->internal[x]); + tn->internal[x] = passed_tn; + + } else if (!tn->internal[x]) { + /* Don't have one, none passed in */ + tn->internal[x] = yaffs_get_tnode(dev); + if(!tn->internal[x]) + return NULL; + } + } + + tn = tn->internal[x]; + l--; + } + } else { + /* top is level 0 */ + if (passed_tn) { + memcpy(tn, passed_tn, (dev->tnode_width * YAFFS_NTNODES_LEVEL0)/8); + yaffs_free_tnode(dev, passed_tn); + } + } + + return tn; +} + +static int yaffs_find_chunk_in_group(yaffs_dev_t *dev, int theChunk, + yaffs_ext_tags *tags, int obj_id, + int inode_chunk) +{ + int j; + + for (j = 0; theChunk && j < dev->chunk_grp_size; j++) { + if (yaffs_check_chunk_bit(dev, theChunk / dev->param.chunks_per_block, + theChunk % dev->param.chunks_per_block)) { + + if(dev->chunk_grp_size == 1) + return theChunk; + else { + yaffs_rd_chunk_tags_nand(dev, theChunk, NULL, + tags); + if (yaffs_tags_match(tags, obj_id, inode_chunk)) { + /* found it; */ + return theChunk; + } + } + } + theChunk++; + } + return -1; +} + +#if 0 +/* Experimental code not being used yet. Might speed up file deletion */ +/* DeleteWorker scans backwards through the tnode tree and deletes all the + * chunks and tnodes in the file. + * Returns 1 if the tree was deleted. + * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete. + */ + +static int yaffs_del_worker(yaffs_obj_t *in, yaffs_tnode_t *tn, __u32 level, + int chunk_offset, int *limit) +{ + int i; + int inode_chunk; + int theChunk; + yaffs_ext_tags tags; + int foundChunk; + yaffs_dev_t *dev = in->my_dev; + + int allDone = 1; + + if (tn) { + if (level > 0) { + for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0; + i--) { + if (tn->internal[i]) { + if (limit && (*limit) < 0) { + allDone = 0; + } else { + allDone = + yaffs_del_worker(in, + tn-> + internal + [i], + level - + 1, + (chunk_offset + << + YAFFS_TNODES_INTERNAL_BITS) + + i, + limit); + } + if (allDone) { + yaffs_free_tnode(dev, + tn-> + internal[i]); + tn->internal[i] = NULL; + } + } + } + return (allDone) ? 1 : 0; + } else if (level == 0) { + int hitLimit = 0; + + for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit; + i--) { + theChunk = yaffs_get_group_base(dev, tn, i); + if (theChunk) { + + inode_chunk = (chunk_offset << + YAFFS_TNODES_LEVEL0_BITS) + i; + + foundChunk = + yaffs_find_chunk_in_group(dev, + theChunk, + &tags, + in->obj_id, + inode_chunk); + + if (foundChunk > 0) { + yaffs_chunk_del(dev, + foundChunk, 1, + __LINE__); + in->n_data_chunks--; + if (limit) { + *limit = *limit - 1; + if (*limit <= 0) + hitLimit = 1; + } + + } + + yaffs_load_tnode_0(dev, tn, i, 0); + } + + } + return (i < 0) ? 1 : 0; + + } + + } + + return 1; + +} + +#endif + +static void yaffs_soft_del_chunk(yaffs_dev_t *dev, int chunk) +{ + yaffs_block_info_t *theBlock; + unsigned block_no; + + T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk)); + + block_no = chunk / dev->param.chunks_per_block; + theBlock = yaffs_get_block_info(dev, block_no); + if (theBlock) { + theBlock->soft_del_pages++; + dev->n_free_chunks++; + yaffs2_update_oldest_dirty_seq(dev, block_no, theBlock); + } +} + +/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file. + * All soft deleting does is increment the block's softdelete count and pulls the chunk out + * of the tnode. + * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted. + */ + +static int yaffs_soft_del_worker(yaffs_obj_t *in, yaffs_tnode_t *tn, + __u32 level, int chunk_offset) +{ + int i; + int theChunk; + int allDone = 1; + yaffs_dev_t *dev = in->my_dev; + + if (tn) { + if (level > 0) { + + for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0; + i--) { + if (tn->internal[i]) { + allDone = + yaffs_soft_del_worker(in, + tn-> + internal[i], + level - 1, + (chunk_offset + << + YAFFS_TNODES_INTERNAL_BITS) + + i); + if (allDone) { + yaffs_free_tnode(dev, + tn-> + internal[i]); + tn->internal[i] = NULL; + } else { + /* Hoosterman... how could this happen? */ + } + } + } + return (allDone) ? 1 : 0; + } else if (level == 0) { + + for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) { + theChunk = yaffs_get_group_base(dev, tn, i); + if (theChunk) { + /* Note this does not find the real chunk, only the chunk group. + * We make an assumption that a chunk group is not larger than + * a block. + */ + yaffs_soft_del_chunk(dev, theChunk); + yaffs_load_tnode_0(dev, tn, i, 0); + } + + } + return 1; + + } + + } + + return 1; + +} + +static void yaffs_soft_del_file(yaffs_obj_t *obj) +{ + if (obj->deleted && + obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) { + if (obj->n_data_chunks <= 0) { + /* Empty file with no duplicate object headers, just delete it immediately */ + yaffs_free_tnode(obj->my_dev, + obj->variant.file_variant.top); + obj->variant.file_variant.top = NULL; + T(YAFFS_TRACE_TRACING, + (TSTR("yaffs: Deleting empty file %d" TENDSTR), + obj->obj_id)); + yaffs_generic_obj_del(obj); + } else { + yaffs_soft_del_worker(obj, + obj->variant.file_variant.top, + obj->variant.file_variant. + top_level, 0); + obj->soft_del = 1; + } + } +} + +/* Pruning removes any part of the file structure tree that is beyond the + * bounds of the file (ie that does not point to chunks). + * + * A file should only get pruned when its size is reduced. + * + * Before pruning, the chunks must be pulled from the tree and the + * level 0 tnode entries must be zeroed out. + * Could also use this for file deletion, but that's probably better handled + * by a special case. + * + * This function is recursive. For levels > 0 the function is called again on + * any sub-tree. For level == 0 we just check if the sub-tree has data. + * If there is no data in a subtree then it is pruned. + */ + +static yaffs_tnode_t *yaffs_prune_worker(yaffs_dev_t *dev, yaffs_tnode_t *tn, + __u32 level, int del0) +{ + int i; + int hasData; + + if (tn) { + hasData = 0; + + if(level > 0){ + for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) { + tn->internal[i] = + yaffs_prune_worker(dev, tn->internal[i], + level - 1, + (i == 0) ? del0 : 1); + } + + if (tn->internal[i]) + hasData++; + } + } else { + int tnode_size_u32 = dev->tnode_size/sizeof(__u32); + __u32 *map = (__u32 *)tn; + + for(i = 0; !hasData && i < tnode_size_u32; i++){ + if(map[i]) + hasData++; + } + } + + if (hasData == 0 && del0) { + /* Free and return NULL */ + + yaffs_free_tnode(dev, tn); + tn = NULL; + } + + } + + return tn; + +} + +static int yaffs_prune_tree(yaffs_dev_t *dev, + yaffs_file_s *file_struct) +{ + int i; + int hasData; + int done = 0; + yaffs_tnode_t *tn; + + if (file_struct->top_level > 0) { + file_struct->top = + yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0); + + /* Now we have a tree with all the non-zero branches NULL but the height + * is the same as it was. + * Let's see if we can trim internal tnodes to shorten the tree. + * We can do this if only the 0th element in the tnode is in use + * (ie all the non-zero are NULL) + */ + + while (file_struct->top_level && !done) { + tn = file_struct->top; + + hasData = 0; + for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) + hasData++; + } + + if (!hasData) { + file_struct->top = tn->internal[0]; + file_struct->top_level--; + yaffs_free_tnode(dev, tn); + } else { + done = 1; + } + } + } + + return YAFFS_OK; +} + +/*-------------------- End of File Structure functions.-------------------*/ + + +/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */ +static yaffs_obj_t *yaffs_alloc_empty_obj(yaffs_dev_t *dev) +{ + yaffs_obj_t *obj = yaffs_alloc_raw_obj(dev); + + if (obj) { + dev->n_obj++; + + /* Now sweeten it up... */ + + memset(obj, 0, sizeof(yaffs_obj_t)); + obj->being_created = 1; + + obj->my_dev = dev; + obj->hdr_chunk = 0; + obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN; + YINIT_LIST_HEAD(&(obj->hard_links)); + YINIT_LIST_HEAD(&(obj->hash_link)); + YINIT_LIST_HEAD(&obj->siblings); + + + /* Now make the directory sane */ + if (dev->root_dir) { + obj->parent = dev->root_dir; + ylist_add(&(obj->siblings), &dev->root_dir->variant.dir_variant.children); + } + + /* Add it to the lost and found directory. + * NB Can't put root or lostNFound in lostNFound so + * check if lostNFound exists first + */ + if (dev->lost_n_found) + yaffs_add_obj_to_dir(dev->lost_n_found, obj); + + obj->being_created = 0; + } + + dev->checkpoint_blocks_required = 0; /* force recalculation*/ + + return obj; +} + +static yaffs_obj_t *yaffs_create_fake_dir(yaffs_dev_t *dev, int number, + __u32 mode) +{ + + yaffs_obj_t *obj = + yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); + if (obj) { + obj->fake = 1; /* it is fake so it might have no NAND presence... */ + obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */ + obj->unlink_allowed = 0; /* ... or unlink it */ + obj->deleted = 0; + obj->unlinked = 0; + obj->yst_mode = mode; + obj->my_dev = dev; + obj->hdr_chunk = 0; /* Not a valid chunk. */ + } + + return obj; + +} + +static void yaffs_unhash_obj(yaffs_obj_t *obj) +{ + int bucket; + yaffs_dev_t *dev = obj->my_dev; + + /* If it is still linked into the bucket list, free from the list */ + if (!ylist_empty(&obj->hash_link)) { + ylist_del_init(&obj->hash_link); + bucket = yaffs_hash_fn(obj->obj_id); + dev->obj_bucket[bucket].count--; + } +} + +/* FreeObject frees up a Object and puts it back on the free list */ +static void yaffs_free_obj(yaffs_obj_t *obj) +{ + yaffs_dev_t *dev = obj->my_dev; + + T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->my_inode)); + + if (!obj) + YBUG(); + if (obj->parent) + YBUG(); + if (!ylist_empty(&obj->siblings)) + YBUG(); + + + if (obj->my_inode) { + /* We're still hooked up to a cached inode. + * Don't delete now, but mark for later deletion + */ + obj->defered_free = 1; + return; + } + + yaffs_unhash_obj(obj); + + yaffs_free_raw_obj(dev,obj); + dev->n_obj--; + dev->checkpoint_blocks_required = 0; /* force recalculation*/ +} + + +void yaffs_handle_defered_free(yaffs_obj_t *obj) +{ + if (obj->defered_free) + yaffs_free_obj(obj); +} + +static void yaffs_init_tnodes_and_objs(yaffs_dev_t *dev) +{ + int i; + + dev->n_obj = 0; + dev->n_tnodes = 0; + + yaffs_init_raw_tnodes_and_objs(dev); + + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + YINIT_LIST_HEAD(&dev->obj_bucket[i].list); + dev->obj_bucket[i].count = 0; + } +} + +static int yaffs_find_nice_bucket(yaffs_dev_t *dev) +{ + int i; + int l = 999; + int lowest = 999999; + + + /* Search for the shortest list or one that + * isn't too long. + */ + + for (i = 0; i < 10 && lowest > 4; i++) { + dev->bucket_finder++; + dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS; + if (dev->obj_bucket[dev->bucket_finder].count < lowest) { + lowest = dev->obj_bucket[dev->bucket_finder].count; + l = dev->bucket_finder; + } + + } + + return l; +} + +static int yaffs_new_obj_id(yaffs_dev_t *dev) +{ + int bucket = yaffs_find_nice_bucket(dev); + + /* Now find an object value that has not already been taken + * by scanning the list. + */ + + int found = 0; + struct ylist_head *i; + + __u32 n = (__u32) bucket; + + /* yaffs_check_obj_hash_sane(); */ + + while (!found) { + found = 1; + n += YAFFS_NOBJECT_BUCKETS; + if (1 || dev->obj_bucket[bucket].count > 0) { + ylist_for_each(i, &dev->obj_bucket[bucket].list) { + /* If there is already one in the list */ + if (i && ylist_entry(i, yaffs_obj_t, + hash_link)->obj_id == n) { + found = 0; + } + } + } + } + + return n; +} + +static void yaffs_hash_obj(yaffs_obj_t *in) +{ + int bucket = yaffs_hash_fn(in->obj_id); + yaffs_dev_t *dev = in->my_dev; + + ylist_add(&in->hash_link, &dev->obj_bucket[bucket].list); + dev->obj_bucket[bucket].count++; +} + +yaffs_obj_t *yaffs_find_by_number(yaffs_dev_t *dev, __u32 number) +{ + int bucket = yaffs_hash_fn(number); + struct ylist_head *i; + yaffs_obj_t *in; + + ylist_for_each(i, &dev->obj_bucket[bucket].list) { + /* Look if it is in the list */ + if (i) { + in = ylist_entry(i, yaffs_obj_t, hash_link); + if (in->obj_id == number) { + + /* Don't tell the VFS about this one if it is defered free */ + if (in->defered_free) + return NULL; + + return in; + } + } + } + + return NULL; +} + +yaffs_obj_t *yaffs_new_obj(yaffs_dev_t *dev, int number, + yaffs_obj_type type) +{ + yaffs_obj_t *theObject=NULL; + yaffs_tnode_t *tn = NULL; + + if (number < 0) + number = yaffs_new_obj_id(dev); + + if (type == YAFFS_OBJECT_TYPE_FILE) { + tn = yaffs_get_tnode(dev); + if (!tn) + return NULL; + } + + theObject = yaffs_alloc_empty_obj(dev); + if (!theObject){ + if(tn) + yaffs_free_tnode(dev,tn); + return NULL; + } + + + if (theObject) { + theObject->fake = 0; + theObject->rename_allowed = 1; + theObject->unlink_allowed = 1; + theObject->obj_id = number; + yaffs_hash_obj(theObject); + theObject->variant_type = type; +#ifdef CONFIG_YAFFS_WINCE + yfsd_win_file_time_now(theObject->win_atime); + theObject->win_ctime[0] = theObject->win_mtime[0] = + theObject->win_atime[0]; + theObject->win_ctime[1] = theObject->win_mtime[1] = + theObject->win_atime[1]; + +#else + + theObject->yst_atime = theObject->yst_mtime = + theObject->yst_ctime = Y_CURRENT_TIME; +#endif + switch (type) { + case YAFFS_OBJECT_TYPE_FILE: + theObject->variant.file_variant.file_size = 0; + theObject->variant.file_variant.scanned_size = 0; + theObject->variant.file_variant.shrink_size = 0xFFFFFFFF; /* max __u32 */ + theObject->variant.file_variant.top_level = 0; + theObject->variant.file_variant.top = tn; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + YINIT_LIST_HEAD(&theObject->variant.dir_variant. + children); + YINIT_LIST_HEAD(&theObject->variant.dir_variant. + dirty); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_SPECIAL: + /* No action required */ + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* todo this should not happen */ + break; + } + } + + return theObject; +} + +yaffs_obj_t *yaffs_find_or_create_by_number(yaffs_dev_t *dev, + int number, + yaffs_obj_type type) +{ + yaffs_obj_t *theObject = NULL; + + if (number > 0) + theObject = yaffs_find_by_number(dev, number); + + if (!theObject) + theObject = yaffs_new_obj(dev, number, type); + + return theObject; + +} + + +YCHAR *yaffs_clone_str(const YCHAR *str) +{ + YCHAR *newStr = NULL; + int len; + + if (!str) + str = _Y(""); + + len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH); + newStr = YMALLOC((len + 1) * sizeof(YCHAR)); + if (newStr){ + yaffs_strncpy(newStr, str,len); + newStr[len] = 0; + } + return newStr; + +} + +/* + * Mknod (create) a new object. + * equiv_obj only has meaning for a hard link; + * aliasString only has meaning for a symlink. + * rdev only has meaning for devices (a subset of special objects) + */ + +static yaffs_obj_t *yaffs_create_obj(yaffs_obj_type type, + yaffs_obj_t *parent, + const YCHAR *name, + __u32 mode, + __u32 uid, + __u32 gid, + yaffs_obj_t *equiv_obj, + const YCHAR *aliasString, __u32 rdev) +{ + yaffs_obj_t *in; + YCHAR *str = NULL; + + yaffs_dev_t *dev = parent->my_dev; + + /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/ + if (yaffs_find_by_name(parent, name)) + return NULL; + + if (type == YAFFS_OBJECT_TYPE_SYMLINK) { + str = yaffs_clone_str(aliasString); + if (!str) + return NULL; + } + + in = yaffs_new_obj(dev, -1, type); + + if (!in){ + if(str) + YFREE(str); + return NULL; + } + + + + + + if (in) { + in->hdr_chunk = 0; + in->valid = 1; + in->variant_type = type; + + in->yst_mode = mode; + +#ifdef CONFIG_YAFFS_WINCE + yfsd_win_file_time_now(in->win_atime); + in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0]; + in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1]; + +#else + in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME; + + in->yst_rdev = rdev; + in->yst_uid = uid; + in->yst_gid = gid; +#endif + in->n_data_chunks = 0; + + yaffs_set_obj_name(in, name); + in->dirty = 1; + + yaffs_add_obj_to_dir(parent, in); + + in->my_dev = parent->my_dev; + + switch (type) { + case YAFFS_OBJECT_TYPE_SYMLINK: + in->variant.symlink_variant.alias = str; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardlink_variant.equiv_obj = + equiv_obj; + in->variant.hardlink_variant.equiv_id = + equiv_obj->obj_id; + ylist_add(&in->hard_links, &equiv_obj->hard_links); + break; + case YAFFS_OBJECT_TYPE_FILE: + case YAFFS_OBJECT_TYPE_DIRECTORY: + case YAFFS_OBJECT_TYPE_SPECIAL: + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* do nothing */ + break; + } + + if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) { + /* Could not create the object header, fail the creation */ + yaffs_del_obj(in); + in = NULL; + } + + yaffs_update_parent(parent); + } + + return in; +} + +yaffs_obj_t *yaffs_create_file(yaffs_obj_t *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, + uid, gid, NULL, NULL, 0); +} + +yaffs_obj_t *yaffs_create_dir(yaffs_obj_t *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, + mode, uid, gid, NULL, NULL, 0); +} + +yaffs_obj_t *yaffs_create_special(yaffs_obj_t *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid, __u32 rdev) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, + uid, gid, NULL, NULL, rdev); +} + +yaffs_obj_t *yaffs_create_symlink(yaffs_obj_t *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid, + const YCHAR *alias) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, + uid, gid, NULL, alias, 0); +} + +/* yaffs_link_obj returns the object id of the equivalent object.*/ +yaffs_obj_t *yaffs_link_obj(yaffs_obj_t *parent, const YCHAR *name, + yaffs_obj_t *equiv_obj) +{ + /* Get the real object in case we were fed a hard link as an equivalent object */ + equiv_obj = yaffs_get_equivalent_obj(equiv_obj); + + if (yaffs_create_obj + (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0, + equiv_obj, NULL, 0)) { + return equiv_obj; + } else { + return NULL; + } + +} + +static int yaffs_change_obj_name(yaffs_obj_t *obj, yaffs_obj_t *new_dir, + const YCHAR *new_name, int force, int shadows) +{ + int unlinkOp; + int deleteOp; + + yaffs_obj_t *existingTarget; + + if (new_dir == NULL) + new_dir = obj->parent; /* use the old directory */ + + if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: yaffs_change_obj_name: new_dir is not a directory" + TENDSTR))); + YBUG(); + } + + /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */ + if (obj->my_dev->param.is_yaffs2) + unlinkOp = (new_dir == obj->my_dev->unlinked_dir); + else + unlinkOp = (new_dir == obj->my_dev->unlinked_dir + && obj->variant_type == YAFFS_OBJECT_TYPE_FILE); + + deleteOp = (new_dir == obj->my_dev->del_dir); + + existingTarget = yaffs_find_by_name(new_dir, new_name); + + /* If the object is a file going into the unlinked directory, + * then it is OK to just stuff it in since duplicate names are allowed. + * else only proceed if the new name does not exist and if we're putting + * it into a directory. + */ + if ((unlinkOp || + deleteOp || + force || + (shadows > 0) || + !existingTarget) && + new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_set_obj_name(obj, new_name); + obj->dirty = 1; + + yaffs_add_obj_to_dir(new_dir, obj); + + if (unlinkOp) + obj->unlinked = 1; + + /* If it is a deletion then we mark it as a shrink for gc purposes. */ + if (yaffs_update_oh(obj, new_name, 0, deleteOp, shadows, NULL) >= 0) + return YAFFS_OK; + } + + return YAFFS_FAIL; +} + +int yaffs_rename_obj(yaffs_obj_t *old_dir, const YCHAR *old_name, + yaffs_obj_t *new_dir, const YCHAR *new_name) +{ + yaffs_obj_t *obj = NULL; + yaffs_obj_t *existingTarget = NULL; + int force = 0; + int result; + yaffs_dev_t *dev; + + + if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + YBUG(); + if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + YBUG(); + + dev = old_dir->my_dev; + +#ifdef CONFIG_YAFFS_CASE_INSENSITIVE + /* Special case for case insemsitive systems (eg. WinCE). + * While look-up is case insensitive, the name isn't. + * Therefore we might want to change x.txt to X.txt + */ + if (old_dir == new_dir && yaffs_strcmp(old_name, new_name) == 0) + force = 1; +#endif + + if(yaffs_strnlen(new_name,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH) + /* ENAMETOOLONG */ + return YAFFS_FAIL; + + obj = yaffs_find_by_name(old_dir, old_name); + + if (obj && obj->rename_allowed) { + + /* Now do the handling for an existing target, if there is one */ + + existingTarget = yaffs_find_by_name(new_dir, new_name); + if (existingTarget && + existingTarget->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY && + !ylist_empty(&existingTarget->variant.dir_variant.children)) { + /* There is a target that is a non-empty directory, so we fail */ + return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */ + } else if (existingTarget && existingTarget != obj) { + /* Nuke the target first, using shadowing, + * but only if it isn't the same object. + * + * Note we must disable gc otherwise it can mess up the shadowing. + * + */ + dev->gc_disable=1; + yaffs_change_obj_name(obj, new_dir, new_name, force, + existingTarget->obj_id); + existingTarget->is_shadowed = 1; + yaffs_unlink_obj(existingTarget); + dev->gc_disable=0; + } + + result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0); + + yaffs_update_parent(old_dir); + if(new_dir != old_dir) + yaffs_update_parent(new_dir); + + return result; + } + return YAFFS_FAIL; +} + +/*------------------------- Block Management and Page Allocation ----------------*/ + +static int yaffs_init_blocks(yaffs_dev_t *dev) +{ + int nBlocks = dev->internal_end_block - dev->internal_start_block + 1; + + dev->block_info = NULL; + dev->chunk_bits = NULL; + + dev->alloc_block = -1; /* force it to get a new one */ + + /* If the first allocation strategy fails, thry the alternate one */ + dev->block_info = YMALLOC(nBlocks * sizeof(yaffs_block_info_t)); + if (!dev->block_info) { + dev->block_info = YMALLOC_ALT(nBlocks * sizeof(yaffs_block_info_t)); + dev->block_info_alt = 1; + } else + dev->block_info_alt = 0; + + if (dev->block_info) { + /* Set up dynamic blockinfo stuff. */ + dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; /* round up bytes */ + dev->chunk_bits = YMALLOC(dev->chunk_bit_stride * nBlocks); + if (!dev->chunk_bits) { + dev->chunk_bits = YMALLOC_ALT(dev->chunk_bit_stride * nBlocks); + dev->chunk_bits_alt = 1; + } else + dev->chunk_bits_alt = 0; + } + + if (dev->block_info && dev->chunk_bits) { + memset(dev->block_info, 0, nBlocks * sizeof(yaffs_block_info_t)); + memset(dev->chunk_bits, 0, dev->chunk_bit_stride * nBlocks); + return YAFFS_OK; + } + + return YAFFS_FAIL; +} + +static void yaffs_deinit_blocks(yaffs_dev_t *dev) +{ + if (dev->block_info_alt && dev->block_info) + YFREE_ALT(dev->block_info); + else if (dev->block_info) + YFREE(dev->block_info); + + dev->block_info_alt = 0; + + dev->block_info = NULL; + + if (dev->chunk_bits_alt && dev->chunk_bits) + YFREE_ALT(dev->chunk_bits); + else if (dev->chunk_bits) + YFREE(dev->chunk_bits); + dev->chunk_bits_alt = 0; + dev->chunk_bits = NULL; +} + +void yaffs_block_became_dirty(yaffs_dev_t *dev, int block_no) +{ + yaffs_block_info_t *bi = yaffs_get_block_info(dev, block_no); + + int erasedOk = 0; + + /* If the block is still healthy erase it and mark as clean. + * If the block has had a data failure, then retire it. + */ + + T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, + (TSTR("yaffs_block_became_dirty block %d state %d %s"TENDSTR), + block_no, bi->block_state, (bi->needs_retiring) ? "needs retiring" : "")); + + yaffs2_clear_oldest_dirty_seq(dev,bi); + + bi->block_state = YAFFS_BLOCK_STATE_DIRTY; + + /* If this is the block being garbage collected then stop gc'ing this block */ + if(block_no == dev->gc_block) + dev->gc_block = 0; + + /* If this block is currently the best candidate for gc then drop as a candidate */ + if(block_no == dev->gc_dirtiest){ + dev->gc_dirtiest = 0; + dev->gc_pages_in_use = 0; + } + + if (!bi->needs_retiring) { + yaffs2_checkpt_invalidate(dev); + erasedOk = yaffs_erase_block(dev, block_no); + if (!erasedOk) { + dev->n_erase_failures++; + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Erasure failed %d" TENDSTR), block_no)); + } + } + + if (erasedOk && + ((yaffs_trace_mask & YAFFS_TRACE_ERASE) || !yaffs_skip_verification(dev))) { + int i; + for (i = 0; i < dev->param.chunks_per_block; i++) { + if (!yaffs_check_chunk_erased + (dev, block_no * dev->param.chunks_per_block + i)) { + T(YAFFS_TRACE_ERROR, + (TSTR + (">>Block %d erasure supposedly OK, but chunk %d not erased" + TENDSTR), block_no, i)); + } + } + } + + if (erasedOk) { + /* Clean it up... */ + bi->block_state = YAFFS_BLOCK_STATE_EMPTY; + bi->seq_number = 0; + dev->n_erased_blocks++; + bi->pages_in_use = 0; + bi->soft_del_pages = 0; + bi->has_shrink_hdr = 0; + bi->skip_erased_check = 1; /* This is clean, so no need to check */ + bi->gc_prioritise = 0; + yaffs_clear_chunk_bits(dev, block_no); + + T(YAFFS_TRACE_ERASE, + (TSTR("Erased block %d" TENDSTR), block_no)); + } else { + dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */ + + yaffs_retire_block(dev, block_no); + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Block %d retired" TENDSTR), block_no)); + } +} + +static int yaffs_find_alloc_block(yaffs_dev_t *dev) +{ + int i; + + yaffs_block_info_t *bi; + + if (dev->n_erased_blocks < 1) { + /* Hoosterman we've got a problem. + * Can't get space to gc + */ + T(YAFFS_TRACE_ERROR, + (TSTR("yaffs tragedy: no more erased blocks" TENDSTR))); + + return -1; + } + + /* Find an empty block. */ + + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + dev->alloc_block_finder++; + if (dev->alloc_block_finder < dev->internal_start_block + || dev->alloc_block_finder > dev->internal_end_block) { + dev->alloc_block_finder = dev->internal_start_block; + } + + bi = yaffs_get_block_info(dev, dev->alloc_block_finder); + + if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { + bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING; + dev->seq_number++; + bi->seq_number = dev->seq_number; + dev->n_erased_blocks--; + T(YAFFS_TRACE_ALLOCATE, + (TSTR("Allocated block %d, seq %d, %d left" TENDSTR), + dev->alloc_block_finder, dev->seq_number, + dev->n_erased_blocks)); + return dev->alloc_block_finder; + } + } + + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("yaffs tragedy: no more erased blocks, but there should have been %d" + TENDSTR), dev->n_erased_blocks)); + + return -1; +} + + +/* + * Check if there's space to allocate... + * Thinks.... do we need top make this ths same as yaffs_get_free_chunks()? + */ +int yaffs_check_alloc_available(yaffs_dev_t *dev, int n_chunks) +{ + int reservedChunks; + int reservedBlocks = dev->param.n_reserved_blocks; + int checkpointBlocks; + + checkpointBlocks = yaffs_calc_checkpt_blocks_required(dev); + + reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.chunks_per_block); + + return (dev->n_free_chunks > (reservedChunks + n_chunks)); +} + +static int yaffs_alloc_chunk(yaffs_dev_t *dev, int useReserve, + yaffs_block_info_t **blockUsedPtr) +{ + int retVal; + yaffs_block_info_t *bi; + + if (dev->alloc_block < 0) { + /* Get next block to allocate off */ + dev->alloc_block = yaffs_find_alloc_block(dev); + dev->alloc_page = 0; + } + + if (!useReserve && !yaffs_check_alloc_available(dev, 1)) { + /* Not enough space to allocate unless we're allowed to use the reserve. */ + return -1; + } + + if (dev->n_erased_blocks < dev->param.n_reserved_blocks + && dev->alloc_page == 0) { + T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR))); + } + + /* Next page please.... */ + if (dev->alloc_block >= 0) { + bi = yaffs_get_block_info(dev, dev->alloc_block); + + retVal = (dev->alloc_block * dev->param.chunks_per_block) + + dev->alloc_page; + bi->pages_in_use++; + yaffs_set_chunk_bit(dev, dev->alloc_block, + dev->alloc_page); + + dev->alloc_page++; + + dev->n_free_chunks--; + + /* If the block is full set the state to full */ + if (dev->alloc_page >= dev->param.chunks_per_block) { + bi->block_state = YAFFS_BLOCK_STATE_FULL; + dev->alloc_block = -1; + } + + if (blockUsedPtr) + *blockUsedPtr = bi; + + return retVal; + } + + T(YAFFS_TRACE_ERROR, + (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); + + return -1; +} + +static int yaffs_get_erased_chunks(yaffs_dev_t *dev) +{ + int n; + + n = dev->n_erased_blocks * dev->param.chunks_per_block; + + if (dev->alloc_block > 0) + n += (dev->param.chunks_per_block - dev->alloc_page); + + return n; + +} + +/* + * yaffs_skip_rest_of_block() skips over the rest of the allocation block + * if we don't want to write to it. + */ +void yaffs_skip_rest_of_block(yaffs_dev_t *dev) +{ + if(dev->alloc_block > 0){ + yaffs_block_info_t *bi = yaffs_get_block_info(dev, dev->alloc_block); + if(bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING){ + bi->block_state = YAFFS_BLOCK_STATE_FULL; + dev->alloc_block = -1; + } + } +} + + +static int yaffs_gc_block(yaffs_dev_t *dev, int block, + int wholeBlock) +{ + int oldChunk; + int newChunk; + int mark_flash; + int retVal = YAFFS_OK; + int i; + int isCheckpointBlock; + int matchingChunk; + int maxCopies; + + int chunksBefore = yaffs_get_erased_chunks(dev); + int chunksAfter; + + yaffs_ext_tags tags; + + yaffs_block_info_t *bi = yaffs_get_block_info(dev, block); + + yaffs_obj_t *object; + + isCheckpointBlock = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT); + + + T(YAFFS_TRACE_TRACING, + (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR), + block, + bi->pages_in_use, + bi->has_shrink_hdr, + wholeBlock)); + + /*yaffs_verify_free_chunks(dev); */ + + if(bi->block_state == YAFFS_BLOCK_STATE_FULL) + bi->block_state = YAFFS_BLOCK_STATE_COLLECTING; + + bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */ + + dev->gc_disable = 1; + + if (isCheckpointBlock || + !yaffs_still_some_chunks(dev, block)) { + T(YAFFS_TRACE_TRACING, + (TSTR + ("Collecting block %d that has no chunks in use" TENDSTR), + block)); + yaffs_block_became_dirty(dev, block); + } else { + + __u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__); + + yaffs_verify_blk(dev, bi, block); + + maxCopies = (wholeBlock) ? dev->param.chunks_per_block : 5; + oldChunk = block * dev->param.chunks_per_block + dev->gc_chunk; + + for (/* init already done */; + retVal == YAFFS_OK && + dev->gc_chunk < dev->param.chunks_per_block && + (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) && + maxCopies > 0; + dev->gc_chunk++, oldChunk++) { + if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) { + + /* This page is in use and might need to be copied off */ + + maxCopies--; + + mark_flash = 1; + + yaffs_init_tags(&tags); + + yaffs_rd_chunk_tags_nand(dev, oldChunk, + buffer, &tags); + + object = + yaffs_find_by_number(dev, + tags.obj_id); + + T(YAFFS_TRACE_GC_DETAIL, + (TSTR + ("Collecting chunk in block %d, %d %d %d " TENDSTR), + dev->gc_chunk, tags.obj_id, tags.chunk_id, + tags.n_bytes)); + + if (object && !yaffs_skip_verification(dev)) { + if (tags.chunk_id == 0) + matchingChunk = object->hdr_chunk; + else if (object->soft_del) + matchingChunk = oldChunk; /* Defeat the test */ + else + matchingChunk = yaffs_find_chunk_in_file(object, tags.chunk_id, NULL); + + if (oldChunk != matchingChunk) + T(YAFFS_TRACE_ERROR, + (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR), + oldChunk, matchingChunk, tags.obj_id, tags.chunk_id)); + + } + + if (!object) { + T(YAFFS_TRACE_ERROR, + (TSTR + ("page %d in gc has no object: %d %d %d " + TENDSTR), oldChunk, + tags.obj_id, tags.chunk_id, tags.n_bytes)); + } + + if (object && + object->deleted && + object->soft_del && + tags.chunk_id != 0) { + /* Data chunk in a soft deleted file, throw it away + * It's a soft deleted data chunk, + * No need to copy this, just forget about it and + * fix up the object. + */ + + /* Free chunks already includes softdeleted chunks. + * How ever this chunk is going to soon be really deleted + * which will increment free chunks. + * We have to decrement free chunks so this works out properly. + */ + dev->n_free_chunks--; + bi->soft_del_pages--; + + object->n_data_chunks--; + + if (object->n_data_chunks <= 0) { + /* remeber to clean up the object */ + dev->gc_cleanup_list[dev->n_clean_ups] = + tags.obj_id; + dev->n_clean_ups++; + } + mark_flash = 0; + } else if (0) { + /* Todo object && object->deleted && object->n_data_chunks == 0 */ + /* Deleted object header with no data chunks. + * Can be discarded and the file deleted. + */ + object->hdr_chunk = 0; + yaffs_free_tnode(object->my_dev, + object->variant. + file_variant.top); + object->variant.file_variant.top = NULL; + yaffs_generic_obj_del(object); + + } else if (object) { + /* It's either a data chunk in a live file or + * an ObjectHeader, so we're interested in it. + * NB Need to keep the ObjectHeaders of deleted files + * until the whole file has been deleted off + */ + tags.serial_number++; + + dev->n_gc_copies++; + + if (tags.chunk_id == 0) { + /* It is an object Id, + * We need to nuke the shrinkheader flags first + * Also need to clean up shadowing. + * We no longer want the shrinkHeader flag since its work is done + * and if it is left in place it will mess up scanning. + */ + + yaffs_obj_header *oh; + oh = (yaffs_obj_header *)buffer; + + oh->is_shrink = 0; + tags.extra_is_shrink = 0; + + oh->shadows_obj = 0; + oh->inband_shadowed_obj_id = 0; + tags.extra_shadows = 0; + + /* Update file size */ + if(object->variant_type == YAFFS_OBJECT_TYPE_FILE){ + oh->file_size = object->variant.file_variant.file_size; + tags.extra_length = oh->file_size; + } + + yaffs_verify_oh(object, oh, &tags, 1); + newChunk = + yaffs_write_new_chunk(dev,(__u8 *) oh, &tags, 1); + } else + newChunk = + yaffs_write_new_chunk(dev, buffer, &tags, 1); + + if (newChunk < 0) { + retVal = YAFFS_FAIL; + } else { + + /* Ok, now fix up the Tnodes etc. */ + + if (tags.chunk_id == 0) { + /* It's a header */ + object->hdr_chunk = newChunk; + object->serial = tags.serial_number; + } else { + /* It's a data chunk */ + int ok; + ok = yaffs_put_chunk_in_file + (object, + tags.chunk_id, + newChunk, 0); + } + } + } + + if (retVal == YAFFS_OK) + yaffs_chunk_del(dev, oldChunk, mark_flash, __LINE__); + + } + } + + yaffs_release_temp_buffer(dev, buffer, __LINE__); + + + + } + + yaffs_verify_collected_blk(dev, bi, block); + + + + if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { + /* + * The gc did not complete. Set block state back to FULL + * because checkpointing does not restore gc. + */ + bi->block_state = YAFFS_BLOCK_STATE_FULL; + } else { + /* The gc completed. */ + /* Do any required cleanups */ + for (i = 0; i < dev->n_clean_ups; i++) { + /* Time to delete the file too */ + object = + yaffs_find_by_number(dev, + dev->gc_cleanup_list[i]); + if (object) { + yaffs_free_tnode(dev, + object->variant.file_variant. + top); + object->variant.file_variant.top = NULL; + T(YAFFS_TRACE_GC, + (TSTR + ("yaffs: About to finally delete object %d" + TENDSTR), object->obj_id)); + yaffs_generic_obj_del(object); + object->my_dev->n_deleted_files--; + } + + } + + + chunksAfter = yaffs_get_erased_chunks(dev); + if (chunksBefore >= chunksAfter) { + T(YAFFS_TRACE_GC, + (TSTR + ("gc did not increase free chunks before %d after %d" + TENDSTR), chunksBefore, chunksAfter)); + } + dev->gc_block = 0; + dev->gc_chunk = 0; + dev->n_clean_ups = 0; + } + + dev->gc_disable = 0; + + return retVal; +} + +/* + * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough) + * for garbage collection. + */ + +static unsigned yaffs_find_gc_block(yaffs_dev_t *dev, + int aggressive, + int background) +{ + int i; + int iterations; + unsigned selected = 0; + int prioritised = 0; + int prioritisedExists = 0; + yaffs_block_info_t *bi; + int threshold; + + /* First let's see if we need to grab a prioritised block */ + if (dev->has_pending_prioritised_gc && !aggressive) { + dev->gc_dirtiest = 0; + bi = dev->block_info; + for (i = dev->internal_start_block; + i <= dev->internal_end_block && !selected; + i++) { + + if (bi->gc_prioritise) { + prioritisedExists = 1; + if (bi->block_state == YAFFS_BLOCK_STATE_FULL && + yaffs_block_ok_for_gc(dev, bi)) { + selected = i; + prioritised = 1; + } + } + bi++; + } + + /* + * If there is a prioritised block and none was selected then + * this happened because there is at least one old dirty block gumming + * up the works. Let's gc the oldest dirty block. + */ + + if(prioritisedExists && + !selected && + dev->oldest_dirty_block > 0) + selected = dev->oldest_dirty_block; + + if (!prioritisedExists) /* None found, so we can clear this */ + dev->has_pending_prioritised_gc = 0; + } + + /* If we're doing aggressive GC then we are happy to take a less-dirty block, and + * search harder. + * else (we're doing a leasurely gc), then we only bother to do this if the + * block has only a few pages in use. + */ + + if (!selected){ + int pagesUsed; + int nBlocks = dev->internal_end_block - dev->internal_start_block + 1; + if (aggressive){ + threshold = dev->param.chunks_per_block; + iterations = nBlocks; + } else { + int maxThreshold; + + if(background) + maxThreshold = dev->param.chunks_per_block/2; + else + maxThreshold = dev->param.chunks_per_block/8; + + if(maxThreshold < YAFFS_GC_PASSIVE_THRESHOLD) + maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD; + + threshold = background ? + (dev->gc_not_done + 2) * 2 : 0; + if(threshold <YAFFS_GC_PASSIVE_THRESHOLD) + threshold = YAFFS_GC_PASSIVE_THRESHOLD; + if(threshold > maxThreshold) + threshold = maxThreshold; + + iterations = nBlocks / 16 + 1; + if (iterations > 100) + iterations = 100; + } + + for (i = 0; + i < iterations && + (dev->gc_dirtiest < 1 || + dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); + i++) { + dev->gc_block_finder++; + if (dev->gc_block_finder < dev->internal_start_block || + dev->gc_block_finder > dev->internal_end_block) + dev->gc_block_finder = dev->internal_start_block; + + bi = yaffs_get_block_info(dev, dev->gc_block_finder); + + pagesUsed = bi->pages_in_use - bi->soft_del_pages; + + if (bi->block_state == YAFFS_BLOCK_STATE_FULL && + pagesUsed < dev->param.chunks_per_block && + (dev->gc_dirtiest < 1 || pagesUsed < dev->gc_pages_in_use) && + yaffs_block_ok_for_gc(dev, bi)) { + dev->gc_dirtiest = dev->gc_block_finder; + dev->gc_pages_in_use = pagesUsed; + } + } + + if(dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold) + selected = dev->gc_dirtiest; + } + + /* + * If nothing has been selected for a while, try selecting the oldest dirty + * because that's gumming up the works. + */ + + if(!selected && dev->param.is_yaffs2 && + dev->gc_not_done >= ( background ? 10 : 20)){ + yaffs2_find_oldest_dirty_seq(dev); + if(dev->oldest_dirty_block > 0) { + selected = dev->oldest_dirty_block; + dev->gc_dirtiest = selected; + dev->oldest_dirty_gc_count++; + bi = yaffs_get_block_info(dev, selected); + dev->gc_pages_in_use = bi->pages_in_use - bi->soft_del_pages; + } else + dev->gc_not_done = 0; + } + + if(selected){ + T(YAFFS_TRACE_GC, + (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), + selected, + dev->param.chunks_per_block - dev->gc_pages_in_use, + prioritised)); + + dev->n_gc_blocks++; + if(background) + dev->bg_gcs++; + + dev->gc_dirtiest = 0; + dev->gc_pages_in_use = 0; + dev->gc_not_done = 0; + if(dev->refresh_skip > 0) + dev->refresh_skip--; + } else{ + dev->gc_not_done++; + T(YAFFS_TRACE_GC, + (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR), + dev->gc_block_finder, dev->gc_not_done, + threshold, + dev->gc_dirtiest, dev->gc_pages_in_use, + dev->oldest_dirty_block, + background ? " bg" : "")); + } + + return selected; +} + +/* New garbage collector + * If we're very low on erased blocks then we do aggressive garbage collection + * otherwise we do "leasurely" garbage collection. + * Aggressive gc looks further (whole array) and will accept less dirty blocks. + * Passive gc only inspects smaller areas and will only accept more dirty blocks. + * + * The idea is to help clear out space in a more spread-out manner. + * Dunno if it really does anything useful. + */ +static int yaffs_check_gc(yaffs_dev_t *dev, int background) +{ + int aggressive = 0; + int gcOk = YAFFS_OK; + int maxTries = 0; + int minErased; + int erasedChunks; + int checkpointBlockAdjust; + + if(dev->param.gc_control && + (dev->param.gc_control(dev) & 1) == 0) + return YAFFS_OK; + + if (dev->gc_disable) { + /* Bail out so we don't get recursive gc */ + return YAFFS_OK; + } + + /* This loop should pass the first time. + * We'll only see looping here if the collection does not increase space. + */ + + do { + maxTries++; + + checkpointBlockAdjust = yaffs_calc_checkpt_blocks_required(dev); + + minErased = dev->param.n_reserved_blocks + checkpointBlockAdjust + 1; + erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block; + + /* If we need a block soon then do aggressive gc.*/ + if (dev->n_erased_blocks < minErased) + aggressive = 1; + else { + if(!background && erasedChunks > (dev->n_free_chunks / 4)) + break; + + if(dev->gc_skip > 20) + dev->gc_skip = 20; + if(erasedChunks < dev->n_free_chunks/2 || + dev->gc_skip < 1 || + background) + aggressive = 0; + else { + dev->gc_skip--; + break; + } + } + + dev->gc_skip = 5; + + /* If we don't already have a block being gc'd then see if we should start another */ + + if (dev->gc_block < 1 && !aggressive) { + dev->gc_block = yaffs2_find_refresh_block(dev); + dev->gc_chunk = 0; + dev->n_clean_ups=0; + } + if (dev->gc_block < 1) { + dev->gc_block = yaffs_find_gc_block(dev, aggressive, background); + dev->gc_chunk = 0; + dev->n_clean_ups=0; + } + + if (dev->gc_block > 0) { + dev->all_gcs++; + if (!aggressive) + dev->passive_gc_count++; + + T(YAFFS_TRACE_GC, + (TSTR + ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR), + dev->n_erased_blocks, aggressive)); + + gcOk = yaffs_gc_block(dev, dev->gc_block, aggressive); + } + + if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) && dev->gc_block > 0) { + T(YAFFS_TRACE_GC, + (TSTR + ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d" + TENDSTR), dev->n_erased_blocks, maxTries, dev->gc_block)); + } + } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) && + (dev->gc_block > 0) && + (maxTries < 2)); + + return aggressive ? gcOk : YAFFS_OK; +} + +/* + * yaffs_bg_gc() + * Garbage collects. Intended to be called from a background thread. + * Returns non-zero if at least half the free chunks are erased. + */ +int yaffs_bg_gc(yaffs_dev_t *dev, unsigned urgency) +{ + int erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block; + + T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency)); + + yaffs_check_gc(dev, 1); + return erasedChunks > dev->n_free_chunks/2; +} + +/*------------------------- TAGS --------------------------------*/ + +static int yaffs_tags_match(const yaffs_ext_tags *tags, int obj_id, + int chunkInObject) +{ + return (tags->chunk_id == chunkInObject && + tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0; + +} + + +/*-------------------- Data file manipulation -----------------*/ + +static int yaffs_find_chunk_in_file(yaffs_obj_t *in, int inode_chunk, + yaffs_ext_tags *tags) +{ + /*Get the Tnode, then get the level 0 offset chunk offset */ + yaffs_tnode_t *tn; + int theChunk = -1; + yaffs_ext_tags localTags; + int retVal = -1; + + yaffs_dev_t *dev = in->my_dev; + + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &localTags; + } + + tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); + + if (tn) { + theChunk = yaffs_get_group_base(dev, tn, inode_chunk); + + retVal = + yaffs_find_chunk_in_group(dev, theChunk, tags, in->obj_id, + inode_chunk); + } + return retVal; +} + +static int yaffs_find_del_file_chunk(yaffs_obj_t *in, int inode_chunk, + yaffs_ext_tags *tags) +{ + /* Get the Tnode, then get the level 0 offset chunk offset */ + yaffs_tnode_t *tn; + int theChunk = -1; + yaffs_ext_tags localTags; + + yaffs_dev_t *dev = in->my_dev; + int retVal = -1; + + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &localTags; + } + + tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); + + if (tn) { + + theChunk = yaffs_get_group_base(dev, tn, inode_chunk); + + retVal = + yaffs_find_chunk_in_group(dev, theChunk, tags, in->obj_id, + inode_chunk); + + /* Delete the entry in the filestructure (if found) */ + if (retVal != -1) + yaffs_load_tnode_0(dev, tn, inode_chunk, 0); + } + + return retVal; +} + + +int yaffs_put_chunk_in_file(yaffs_obj_t *in, int inode_chunk, + int nand_chunk, int in_scan) +{ + /* NB in_scan is zero unless scanning. + * For forward scanning, in_scan is > 0; + * for backward scanning in_scan is < 0 + * + * nand_chunk = 0 is a dummy insert to make sure the tnodes are there. + */ + + yaffs_tnode_t *tn; + yaffs_dev_t *dev = in->my_dev; + int existingChunk; + yaffs_ext_tags existingTags; + yaffs_ext_tags newTags; + unsigned existingSerial, newSerial; + + if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) { + /* Just ignore an attempt at putting a chunk into a non-file during scanning + * If it is not during Scanning then something went wrong! + */ + if (!in_scan) { + T(YAFFS_TRACE_ERROR, + (TSTR + ("yaffs tragedy:attempt to put data chunk into a non-file" + TENDSTR))); + YBUG(); + } + + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + return YAFFS_OK; + } + + tn = yaffs_add_find_tnode_0(dev, + &in->variant.file_variant, + inode_chunk, + NULL); + if (!tn) + return YAFFS_FAIL; + + if(!nand_chunk) + /* Dummy insert, bail now */ + return YAFFS_OK; + + existingChunk = yaffs_get_group_base(dev, tn, inode_chunk); + + if (in_scan != 0) { + /* If we're scanning then we need to test for duplicates + * NB This does not need to be efficient since it should only ever + * happen when the power fails during a write, then only one + * chunk should ever be affected. + * + * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO + * Update: For backward scanning we don't need to re-read tags so this is quite cheap. + */ + + if (existingChunk > 0) { + /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1 + * thus we have to do a FindChunkInFile to get the real chunk id. + * + * We have a duplicate now we need to decide which one to use: + * + * Backwards scanning YAFFS2: The old one is what we use, dump the new one. + * Forward scanning YAFFS2: The new one is what we use, dump the old one. + * YAFFS1: Get both sets of tags and compare serial numbers. + */ + + if (in_scan > 0) { + /* Only do this for forward scanning */ + yaffs_rd_chunk_tags_nand(dev, + nand_chunk, + NULL, &newTags); + + /* Do a proper find */ + existingChunk = + yaffs_find_chunk_in_file(in, inode_chunk, + &existingTags); + } + + if (existingChunk <= 0) { + /*Hoosterman - how did this happen? */ + + T(YAFFS_TRACE_ERROR, + (TSTR + ("yaffs tragedy: existing chunk < 0 in scan" + TENDSTR))); + + } + + /* NB The deleted flags should be false, otherwise the chunks will + * not be loaded during a scan + */ + + if (in_scan > 0) { + newSerial = newTags.serial_number; + existingSerial = existingTags.serial_number; + } + + if ((in_scan > 0) && + (existingChunk <= 0 || + ((existingSerial + 1) & 3) == newSerial)) { + /* Forward scanning. + * Use new + * Delete the old one and drop through to update the tnode + */ + yaffs_chunk_del(dev, existingChunk, 1, + __LINE__); + } else { + /* Backward scanning or we want to use the existing one + * Use existing. + * Delete the new one and return early so that the tnode isn't changed + */ + yaffs_chunk_del(dev, nand_chunk, 1, + __LINE__); + return YAFFS_OK; + } + } + + } + + if (existingChunk == 0) + in->n_data_chunks++; + + yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk); + + return YAFFS_OK; +} + +static int yaffs_rd_data_obj(yaffs_obj_t *in, int inode_chunk, + __u8 *buffer) +{ + int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL); + + if (nand_chunk >= 0) + return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk, + buffer, NULL); + else { + T(YAFFS_TRACE_NANDACCESS, + (TSTR("Chunk %d not found zero instead" TENDSTR), + nand_chunk)); + /* get sane (zero) data if you read a hole */ + memset(buffer, 0, in->my_dev->data_bytes_per_chunk); + return 0; + } + +} + +void yaffs_chunk_del(yaffs_dev_t *dev, int chunk_id, int mark_flash, int lyn) +{ + int block; + int page; + yaffs_ext_tags tags; + yaffs_block_info_t *bi; + + if (chunk_id <= 0) + return; + + dev->n_deletions++; + block = chunk_id / dev->param.chunks_per_block; + page = chunk_id % dev->param.chunks_per_block; + + + if (!yaffs_check_chunk_bit(dev, block, page)) + T(YAFFS_TRACE_VERIFY, + (TSTR("Deleting invalid chunk %d"TENDSTR), + chunk_id)); + + bi = yaffs_get_block_info(dev, block); + + yaffs2_update_oldest_dirty_seq(dev, block, bi); + + T(YAFFS_TRACE_DELETION, + (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunk_id)); + + if (!dev->param.is_yaffs2 && mark_flash && + bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) { + + yaffs_init_tags(&tags); + + tags.is_deleted = 1; + + yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags); + yaffs_handle_chunk_update(dev, chunk_id, &tags); + } else { + dev->n_unmarked_deletions++; + } + + /* Pull out of the management area. + * If the whole block became dirty, this will kick off an erasure. + */ + if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING || + bi->block_state == YAFFS_BLOCK_STATE_FULL || + bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCANNING || + bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { + dev->n_free_chunks++; + + yaffs_clear_chunk_bit(dev, block, page); + + bi->pages_in_use--; + + if (bi->pages_in_use == 0 && + !bi->has_shrink_hdr && + bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING && + bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCANNING) { + yaffs_block_became_dirty(dev, block); + } + + } + +} + +static int yaffs_wr_data_obj(yaffs_obj_t *in, int inode_chunk, + const __u8 *buffer, int n_bytes, + int useReserve) +{ + /* Find old chunk Need to do this to get serial number + * Write new one and patch into tree. + * Invalidate old tags. + */ + + int prevChunkId; + yaffs_ext_tags prevTags; + + int newChunkId; + yaffs_ext_tags newTags; + + yaffs_dev_t *dev = in->my_dev; + + yaffs_check_gc(dev,0); + + /* Get the previous chunk at this location in the file if it exists. + * If it does not exist then put a zero into the tree. This creates + * the tnode now, rather than later when it is harder to clean up. + */ + prevChunkId = yaffs_find_chunk_in_file(in, inode_chunk, &prevTags); + if(prevChunkId < 1 && + !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0)) + return 0; + + /* Set up new tags */ + yaffs_init_tags(&newTags); + + newTags.chunk_id = inode_chunk; + newTags.obj_id = in->obj_id; + newTags.serial_number = + (prevChunkId > 0) ? prevTags.serial_number + 1 : 1; + newTags.n_bytes = n_bytes; + + if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) { + T(YAFFS_TRACE_ERROR, + (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), n_bytes)); + YBUG(); + } + + + newChunkId = + yaffs_write_new_chunk(dev, buffer, &newTags, + useReserve); + + if (newChunkId > 0) { + yaffs_put_chunk_in_file(in, inode_chunk, newChunkId, 0); + + if (prevChunkId > 0) + yaffs_chunk_del(dev, prevChunkId, 1, __LINE__); + + yaffs_verify_file_sane(in); + } + return newChunkId; + +} + +/* UpdateObjectHeader updates the header on NAND for an object. + * If name is not NULL, then that new name is used. + */ +int yaffs_update_oh(yaffs_obj_t *in, const YCHAR *name, int force, + int is_shrink, int shadows, yaffs_xattr_mod *xmod) +{ + + yaffs_block_info_t *bi; + + yaffs_dev_t *dev = in->my_dev; + + int prevChunkId; + int retVal = 0; + int result = 0; + + int newChunkId; + yaffs_ext_tags newTags; + yaffs_ext_tags oldTags; + const YCHAR *alias = NULL; + + __u8 *buffer = NULL; + YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1]; + + yaffs_obj_header *oh = NULL; + + yaffs_strcpy(old_name, _Y("silly old name")); + + + if (!in->fake || + in == dev->root_dir || /* The root_dir should also be saved */ + force || xmod) { + + yaffs_check_gc(dev,0); + yaffs_check_obj_details_loaded(in); + + buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__); + oh = (yaffs_obj_header *) buffer; + + prevChunkId = in->hdr_chunk; + + if (prevChunkId > 0) { + result = yaffs_rd_chunk_tags_nand(dev, prevChunkId, + buffer, &oldTags); + + yaffs_verify_oh(in, oh, &oldTags, 0); + + memcpy(old_name, oh->name, sizeof(oh->name)); + memset(buffer, 0xFF, sizeof(yaffs_obj_header)); + } else + memset(buffer, 0xFF, dev->data_bytes_per_chunk); + + oh->type = in->variant_type; + oh->yst_mode = in->yst_mode; + oh->shadows_obj = oh->inband_shadowed_obj_id = shadows; + +#ifdef CONFIG_YAFFS_WINCE + oh->win_atime[0] = in->win_atime[0]; + oh->win_ctime[0] = in->win_ctime[0]; + oh->win_mtime[0] = in->win_mtime[0]; + oh->win_atime[1] = in->win_atime[1]; + oh->win_ctime[1] = in->win_ctime[1]; + oh->win_mtime[1] = in->win_mtime[1]; +#else + oh->yst_uid = in->yst_uid; + oh->yst_gid = in->yst_gid; + oh->yst_atime = in->yst_atime; + oh->yst_mtime = in->yst_mtime; + oh->yst_ctime = in->yst_ctime; + oh->yst_rdev = in->yst_rdev; +#endif + if (in->parent) + oh->parent_obj_id = in->parent->obj_id; + else + oh->parent_obj_id = 0; + + if (name && *name) { + memset(oh->name, 0, sizeof(oh->name)); + yaffs_load_oh_from_name(dev,oh->name,name); + } else if (prevChunkId > 0) + memcpy(oh->name, old_name, sizeof(oh->name)); + else + memset(oh->name, 0, sizeof(oh->name)); + + oh->is_shrink = is_shrink; + + switch (in->variant_type) { + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* Should not happen */ + break; + case YAFFS_OBJECT_TYPE_FILE: + oh->file_size = + (oh->parent_obj_id == YAFFS_OBJECTID_DELETED + || oh->parent_obj_id == + YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant. + file_variant.file_size; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + oh->equiv_id = + in->variant.hardlink_variant.equiv_id; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + alias = in->variant.symlink_variant.alias; + if(!alias) + alias = _Y("no alias"); + yaffs_strncpy(oh->alias, + alias, + YAFFS_MAX_ALIAS_LENGTH); + oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; + break; + } + + /* process any xattrib modifications */ + if(xmod) + yaffs_apply_xattrib_mod(in, (char *)buffer, xmod); + + + /* Tags */ + yaffs_init_tags(&newTags); + in->serial++; + newTags.chunk_id = 0; + newTags.obj_id = in->obj_id; + newTags.serial_number = in->serial; + + /* Add extra info for file header */ + + newTags.extra_available = 1; + newTags.extra_parent_id = oh->parent_obj_id; + newTags.extra_length = oh->file_size; + newTags.extra_is_shrink = oh->is_shrink; + newTags.extra_equiv_id = oh->equiv_id; + newTags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0; + newTags.extra_obj_type = in->variant_type; + + yaffs_verify_oh(in, oh, &newTags, 1); + + /* Create new chunk in NAND */ + newChunkId = + yaffs_write_new_chunk(dev, buffer, &newTags, + (prevChunkId > 0) ? 1 : 0); + + if (newChunkId >= 0) { + + in->hdr_chunk = newChunkId; + + if (prevChunkId > 0) { + yaffs_chunk_del(dev, prevChunkId, 1, + __LINE__); + } + + if (!yaffs_obj_cache_dirty(in)) + in->dirty = 0; + + /* If this was a shrink, then mark the block that the chunk lives on */ + if (is_shrink) { + bi = yaffs_get_block_info(in->my_dev, + newChunkId / in->my_dev->param.chunks_per_block); + bi->has_shrink_hdr = 1; + } + + } + + retVal = newChunkId; + + } + + if (buffer) + yaffs_release_temp_buffer(dev, buffer, __LINE__); + + return retVal; +} + +/*------------------------ Short Operations Cache ---------------------------------------- + * In many situations where there is no high level buffering (eg WinCE) a lot of + * reads might be short sequential reads, and a lot of writes may be short + * sequential writes. eg. scanning/writing a jpeg file. + * In these cases, a short read/write cache can provide a huge perfomance benefit + * with dumb-as-a-rock code. + * In Linux, the page cache provides read buffering aand the short op cache provides write + * buffering. + * + * There are a limited number (~10) of cache chunks per device so that we don't + * need a very intelligent search. + */ + +static int yaffs_obj_cache_dirty(yaffs_obj_t *obj) +{ + yaffs_dev_t *dev = obj->my_dev; + int i; + yaffs_cache_t *cache; + int nCaches = obj->my_dev->param.n_caches; + + for (i = 0; i < nCaches; i++) { + cache = &dev->cache[i]; + if (cache->object == obj && + cache->dirty) + return 1; + } + + return 0; +} + + +static void yaffs_flush_file_cache(yaffs_obj_t *obj) +{ + yaffs_dev_t *dev = obj->my_dev; + int lowest = -99; /* Stop compiler whining. */ + int i; + yaffs_cache_t *cache; + int chunkWritten = 0; + int nCaches = obj->my_dev->param.n_caches; + + if (nCaches > 0) { + do { + cache = NULL; + + /* Find the dirty cache for this object with the lowest chunk id. */ + for (i = 0; i < nCaches; i++) { + if (dev->cache[i].object == obj && + dev->cache[i].dirty) { + if (!cache + || dev->cache[i].chunk_id < + lowest) { + cache = &dev->cache[i]; + lowest = cache->chunk_id; + } + } + } + + if (cache && !cache->locked) { + /* Write it out and free it up */ + + chunkWritten = + yaffs_wr_data_obj(cache->object, + cache->chunk_id, + cache->data, + cache->n_bytes, + 1); + cache->dirty = 0; + cache->object = NULL; + } + + } while (cache && chunkWritten > 0); + + if (cache) { + /* Hoosterman, disk full while writing cache out. */ + T(YAFFS_TRACE_ERROR, + (TSTR("yaffs tragedy: no space during cache write" TENDSTR))); + + } + } + +} + +/*yaffs_flush_whole_cache(dev) + * + * + */ + +void yaffs_flush_whole_cache(yaffs_dev_t *dev) +{ + yaffs_obj_t *obj; + int nCaches = dev->param.n_caches; + int i; + + /* Find a dirty object in the cache and flush it... + * until there are no further dirty objects. + */ + do { + obj = NULL; + for (i = 0; i < nCaches && !obj; i++) { + if (dev->cache[i].object && + dev->cache[i].dirty) + obj = dev->cache[i].object; + + } + if (obj) + yaffs_flush_file_cache(obj); + + } while (obj); + +} + + +/* Grab us a cache chunk for use. + * First look for an empty one. + * Then look for the least recently used non-dirty one. + * Then look for the least recently used dirty one...., flush and look again. + */ +static yaffs_cache_t *yaffs_grab_chunk_worker(yaffs_dev_t *dev) +{ + int i; + + if (dev->param.n_caches > 0) { + for (i = 0; i < dev->param.n_caches; i++) { + if (!dev->cache[i].object) + return &dev->cache[i]; + } + } + + return NULL; +} + +static yaffs_cache_t *yaffs_grab_chunk_cache(yaffs_dev_t *dev) +{ + yaffs_cache_t *cache; + yaffs_obj_t *theObj; + int usage; + int i; + int pushout; + + if (dev->param.n_caches > 0) { + /* Try find a non-dirty one... */ + + cache = yaffs_grab_chunk_worker(dev); + + if (!cache) { + /* They were all dirty, find the last recently used object and flush + * its cache, then find again. + * NB what's here is not very accurate, we actually flush the object + * the last recently used page. + */ + + /* With locking we can't assume we can use entry zero */ + + theObj = NULL; + usage = -1; + cache = NULL; + pushout = -1; + + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object && + !dev->cache[i].locked && + (dev->cache[i].last_use < usage || !cache)) { + usage = dev->cache[i].last_use; + theObj = dev->cache[i].object; + cache = &dev->cache[i]; + pushout = i; + } + } + + if (!cache || cache->dirty) { + /* Flush and try again */ + yaffs_flush_file_cache(theObj); + cache = yaffs_grab_chunk_worker(dev); + } + + } + return cache; + } else + return NULL; + +} + +/* Find a cached chunk */ +static yaffs_cache_t *yaffs_find_chunk_cache(const yaffs_obj_t *obj, + int chunk_id) +{ + yaffs_dev_t *dev = obj->my_dev; + int i; + if (dev->param.n_caches > 0) { + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object == obj && + dev->cache[i].chunk_id == chunk_id) { + dev->cache_hits++; + + return &dev->cache[i]; + } + } + } + return NULL; +} + +/* Mark the chunk for the least recently used algorithym */ +static void yaffs_use_cache(yaffs_dev_t *dev, yaffs_cache_t *cache, + int isAWrite) +{ + + if (dev->param.n_caches > 0) { + if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) { + /* Reset the cache usages */ + int i; + for (i = 1; i < dev->param.n_caches; i++) + dev->cache[i].last_use = 0; + + dev->cache_last_use = 0; + } + + dev->cache_last_use++; + + cache->last_use = dev->cache_last_use; + + if (isAWrite) + cache->dirty = 1; + } +} + +/* Invalidate a single cache page. + * Do this when a whole page gets written, + * ie the short cache for this page is no longer valid. + */ +static void yaffs_invalidate_chunk_cache(yaffs_obj_t *object, int chunk_id) +{ + if (object->my_dev->param.n_caches > 0) { + yaffs_cache_t *cache = yaffs_find_chunk_cache(object, chunk_id); + + if (cache) + cache->object = NULL; + } +} + +/* Invalidate all the cache pages associated with this object + * Do this whenever ther file is deleted or resized. + */ +static void yaffs_invalidate_whole_cache(yaffs_obj_t *in) +{ + int i; + yaffs_dev_t *dev = in->my_dev; + + if (dev->param.n_caches > 0) { + /* Invalidate it. */ + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object == in) + dev->cache[i].object = NULL; + } + } +} + + +/*--------------------- File read/write ------------------------ + * Read and write have very similar structures. + * In general the read/write has three parts to it + * An incomplete chunk to start with (if the read/write is not chunk-aligned) + * Some complete chunks + * An incomplete chunk to end off with + * + * Curve-balls: the first chunk might also be the last chunk. + */ + +int yaffs_file_rd(yaffs_obj_t *in, __u8 *buffer, loff_t offset, + int n_bytes) +{ + + int chunk; + __u32 start; + int nToCopy; + int n = n_bytes; + int nDone = 0; + yaffs_cache_t *cache; + + yaffs_dev_t *dev; + + dev = in->my_dev; + + while (n > 0) { + /* chunk = offset / dev->data_bytes_per_chunk + 1; */ + /* start = offset % dev->data_bytes_per_chunk; */ + yaffs_addr_to_chunk(dev, offset, &chunk, &start); + chunk++; + + /* OK now check for the curveball where the start and end are in + * the same chunk. + */ + if ((start + n) < dev->data_bytes_per_chunk) + nToCopy = n; + else + nToCopy = dev->data_bytes_per_chunk - start; + + cache = yaffs_find_chunk_cache(in, chunk); + + /* If the chunk is already in the cache or it is less than a whole chunk + * or we're using inband tags then use the cache (if there is caching) + * else bypass the cache. + */ + if (cache || nToCopy != dev->data_bytes_per_chunk || dev->param.inband_tags) { + if (dev->param.n_caches > 0) { + + /* If we can't find the data in the cache, then load it up. */ + + if (!cache) { + cache = yaffs_grab_chunk_cache(in->my_dev); + cache->object = in; + cache->chunk_id = chunk; + cache->dirty = 0; + cache->locked = 0; + yaffs_rd_data_obj(in, chunk, + cache-> + data); + cache->n_bytes = 0; + } + + yaffs_use_cache(dev, cache, 0); + + cache->locked = 1; + + + memcpy(buffer, &cache->data[start], nToCopy); + + cache->locked = 0; + } else { + /* Read into the local buffer then copy..*/ + + __u8 *localBuffer = + yaffs_get_temp_buffer(dev, __LINE__); + yaffs_rd_data_obj(in, chunk, + localBuffer); + + memcpy(buffer, &localBuffer[start], nToCopy); + + + yaffs_release_temp_buffer(dev, localBuffer, + __LINE__); + } + + } else { + + /* A full chunk. Read directly into the supplied buffer. */ + yaffs_rd_data_obj(in, chunk, buffer); + + } + + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; + + } + + return nDone; +} + +int yaffs_do_file_wr(yaffs_obj_t *in, const __u8 *buffer, loff_t offset, + int n_bytes, int write_trhrough) +{ + + int chunk; + __u32 start; + int nToCopy; + int n = n_bytes; + int nDone = 0; + int nToWriteBack; + int startOfWrite = offset; + int chunkWritten = 0; + __u32 n_bytesRead; + __u32 chunkStart; + + yaffs_dev_t *dev; + + dev = in->my_dev; + + while (n > 0 && chunkWritten >= 0) { + yaffs_addr_to_chunk(dev, offset, &chunk, &start); + + if (chunk * dev->data_bytes_per_chunk + start != offset || + start >= dev->data_bytes_per_chunk) { + T(YAFFS_TRACE_ERROR, ( + TSTR("AddrToChunk of offset %d gives chunk %d start %d" + TENDSTR), + (int)offset, chunk, start)); + } + chunk++; /* File pos to chunk in file offset */ + + /* OK now check for the curveball where the start and end are in + * the same chunk. + */ + + if ((start + n) < dev->data_bytes_per_chunk) { + nToCopy = n; + + /* Now folks, to calculate how many bytes to write back.... + * If we're overwriting and not writing to then end of file then + * we need to write back as much as was there before. + */ + + chunkStart = ((chunk - 1) * dev->data_bytes_per_chunk); + + if (chunkStart > in->variant.file_variant.file_size) + n_bytesRead = 0; /* Past end of file */ + else + n_bytesRead = in->variant.file_variant.file_size - chunkStart; + + if (n_bytesRead > dev->data_bytes_per_chunk) + n_bytesRead = dev->data_bytes_per_chunk; + + nToWriteBack = + (n_bytesRead > + (start + n)) ? n_bytesRead : (start + n); + + if (nToWriteBack < 0 || nToWriteBack > dev->data_bytes_per_chunk) + YBUG(); + + } else { + nToCopy = dev->data_bytes_per_chunk - start; + nToWriteBack = dev->data_bytes_per_chunk; + } + + if (nToCopy != dev->data_bytes_per_chunk || dev->param.inband_tags) { + /* An incomplete start or end chunk (or maybe both start and end chunk), + * or we're using inband tags, so we want to use the cache buffers. + */ + if (dev->param.n_caches > 0) { + yaffs_cache_t *cache; + /* If we can't find the data in the cache, then load the cache */ + cache = yaffs_find_chunk_cache(in, chunk); + + if (!cache + && yaffs_check_alloc_available(dev, 1)) { + cache = yaffs_grab_chunk_cache(dev); + cache->object = in; + cache->chunk_id = chunk; + cache->dirty = 0; + cache->locked = 0; + yaffs_rd_data_obj(in, chunk, + cache->data); + } else if (cache && + !cache->dirty && + !yaffs_check_alloc_available(dev, 1)) { + /* Drop the cache if it was a read cache item and + * no space check has been made for it. + */ + cache = NULL; + } + + if (cache) { + yaffs_use_cache(dev, cache, 1); + cache->locked = 1; + + + memcpy(&cache->data[start], buffer, + nToCopy); + + + cache->locked = 0; + cache->n_bytes = nToWriteBack; + + if (write_trhrough) { + chunkWritten = + yaffs_wr_data_obj + (cache->object, + cache->chunk_id, + cache->data, cache->n_bytes, + 1); + cache->dirty = 0; + } + + } else { + chunkWritten = -1; /* fail the write */ + } + } else { + /* An incomplete start or end chunk (or maybe both start and end chunk) + * Read into the local buffer then copy, then copy over and write back. + */ + + __u8 *localBuffer = + yaffs_get_temp_buffer(dev, __LINE__); + + yaffs_rd_data_obj(in, chunk, + localBuffer); + + + + memcpy(&localBuffer[start], buffer, nToCopy); + + chunkWritten = + yaffs_wr_data_obj(in, chunk, + localBuffer, + nToWriteBack, + 0); + + yaffs_release_temp_buffer(dev, localBuffer, + __LINE__); + + } + + } else { + /* A full chunk. Write directly from the supplied buffer. */ + + + + chunkWritten = + yaffs_wr_data_obj(in, chunk, buffer, + dev->data_bytes_per_chunk, + 0); + + /* Since we've overwritten the cached data, we better invalidate it. */ + yaffs_invalidate_chunk_cache(in, chunk); + } + + if (chunkWritten >= 0) { + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; + } + + } + + /* Update file object */ + + if ((startOfWrite + nDone) > in->variant.file_variant.file_size) + in->variant.file_variant.file_size = (startOfWrite + nDone); + + in->dirty = 1; + + return nDone; +} + +int yaffs_wr_file(yaffs_obj_t *in, const __u8 *buffer, loff_t offset, + int n_bytes, int write_trhrough) +{ + yaffs2_handle_hole(in,offset); + return yaffs_do_file_wr(in,buffer,offset,n_bytes,write_trhrough); +} + + + +/* ---------------------- File resizing stuff ------------------ */ + +static void yaffs_prune_chunks(yaffs_obj_t *in, int new_size) +{ + + yaffs_dev_t *dev = in->my_dev; + int oldFileSize = in->variant.file_variant.file_size; + + int lastDel = 1 + (oldFileSize - 1) / dev->data_bytes_per_chunk; + + int startDel = 1 + (new_size + dev->data_bytes_per_chunk - 1) / + dev->data_bytes_per_chunk; + int i; + int chunk_id; + + /* Delete backwards so that we don't end up with holes if + * power is lost part-way through the operation. + */ + for (i = lastDel; i >= startDel; i--) { + /* NB this could be optimised somewhat, + * eg. could retrieve the tags and write them without + * using yaffs_chunk_del + */ + + chunk_id = yaffs_find_del_file_chunk(in, i, NULL); + if (chunk_id > 0) { + if (chunk_id < + (dev->internal_start_block * dev->param.chunks_per_block) + || chunk_id >= + ((dev->internal_end_block + + 1) * dev->param.chunks_per_block)) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("Found daft chunk_id %d for %d" TENDSTR), + chunk_id, i)); + } else { + in->n_data_chunks--; + yaffs_chunk_del(dev, chunk_id, 1, __LINE__); + } + } + } + +} + + +void yaffs_resize_file_down( yaffs_obj_t *obj, loff_t new_size) +{ + int newFullChunks; + __u32 new_sizeOfPartialChunk; + yaffs_dev_t *dev = obj->my_dev; + + yaffs_addr_to_chunk(dev, new_size, &newFullChunks, &new_sizeOfPartialChunk); + + yaffs_prune_chunks(obj, new_size); + + if (new_sizeOfPartialChunk != 0) { + int lastChunk = 1 + newFullChunks; + __u8 *localBuffer = yaffs_get_temp_buffer(dev, __LINE__); + + /* Got to read and rewrite the last chunk with its new size and zero pad */ + yaffs_rd_data_obj(obj, lastChunk, localBuffer); + memset(localBuffer + new_sizeOfPartialChunk, 0, + dev->data_bytes_per_chunk - new_sizeOfPartialChunk); + + yaffs_wr_data_obj(obj, lastChunk, localBuffer, + new_sizeOfPartialChunk, 1); + + yaffs_release_temp_buffer(dev, localBuffer, __LINE__); + } + + obj->variant.file_variant.file_size = new_size; + + yaffs_prune_tree(dev, &obj->variant.file_variant); +} + + +int yaffs_resize_file(yaffs_obj_t *in, loff_t new_size) +{ + yaffs_dev_t *dev = in->my_dev; + int oldFileSize = in->variant.file_variant.file_size; + + yaffs_flush_file_cache(in); + yaffs_invalidate_whole_cache(in); + + yaffs_check_gc(dev,0); + + if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) + return YAFFS_FAIL; + + if (new_size == oldFileSize) + return YAFFS_OK; + + if(new_size > oldFileSize){ + yaffs2_handle_hole(in,new_size); + in->variant.file_variant.file_size = new_size; + } else { + /* new_size < oldFileSize */ + yaffs_resize_file_down(in, new_size); + } + + /* Write a new object header to reflect the resize. + * show we've shrunk the file, if need be + * Do this only if the file is not in the deleted directories + * and is not shadowed. + */ + if (in->parent && + !in->is_shadowed && + in->parent->obj_id != YAFFS_OBJECTID_UNLINKED && + in->parent->obj_id != YAFFS_OBJECTID_DELETED) + yaffs_update_oh(in, NULL, 0, 0, 0, NULL); + + + return YAFFS_OK; +} + +loff_t yaffs_get_file_size(yaffs_obj_t *obj) +{ + YCHAR *alias = NULL; + obj = yaffs_get_equivalent_obj(obj); + + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + return obj->variant.file_variant.file_size; + case YAFFS_OBJECT_TYPE_SYMLINK: + alias = obj->variant.symlink_variant.alias; + if(!alias) + return 0; + return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH); + default: + return 0; + } +} + + + +int yaffs_flush_file(yaffs_obj_t *in, int update_time, int data_sync) +{ + int retVal; + if (in->dirty) { + yaffs_flush_file_cache(in); + if(data_sync) /* Only sync data */ + retVal=YAFFS_OK; + else { + if (update_time) { +#ifdef CONFIG_YAFFS_WINCE + yfsd_win_file_time_now(in->win_mtime); +#else + + in->yst_mtime = Y_CURRENT_TIME; + +#endif + } + + retVal = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= + 0) ? YAFFS_OK : YAFFS_FAIL; + } + } else { + retVal = YAFFS_OK; + } + + return retVal; + +} + +static int yaffs_generic_obj_del(yaffs_obj_t *in) +{ + + /* First off, invalidate the file's data in the cache, without flushing. */ + yaffs_invalidate_whole_cache(in); + + if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) { + /* Move to the unlinked directory so we have a record that it was deleted. */ + yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, 0); + + } + + yaffs_remove_obj_from_dir(in); + yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__); + in->hdr_chunk = 0; + + yaffs_free_obj(in); + return YAFFS_OK; + +} + +/* yaffs_del_file deletes the whole file data + * and the inode associated with the file. + * It does not delete the links associated with the file. + */ +static int yaffs_unlink_file_if_needed(yaffs_obj_t *in) +{ + + int retVal; + int immediateDeletion = 0; + yaffs_dev_t *dev = in->my_dev; + + if (!in->my_inode) + immediateDeletion = 1; + + if (immediateDeletion) { + retVal = + yaffs_change_obj_name(in, in->my_dev->del_dir, + _Y("deleted"), 0, 0); + T(YAFFS_TRACE_TRACING, + (TSTR("yaffs: immediate deletion of file %d" TENDSTR), + in->obj_id)); + in->deleted = 1; + in->my_dev->n_deleted_files++; + if (dev->param.disable_soft_del || dev->param.is_yaffs2) + yaffs_resize_file(in, 0); + yaffs_soft_del_file(in); + } else { + retVal = + yaffs_change_obj_name(in, in->my_dev->unlinked_dir, + _Y("unlinked"), 0, 0); + } + + + return retVal; +} + +int yaffs_del_file(yaffs_obj_t *in) +{ + int retVal = YAFFS_OK; + int deleted; /* Need to cache value on stack if in is freed */ + yaffs_dev_t *dev = in->my_dev; + + if (dev->param.disable_soft_del || dev->param.is_yaffs2) + yaffs_resize_file(in, 0); + + if (in->n_data_chunks > 0) { + /* Use soft deletion if there is data in the file. + * That won't be the case if it has been resized to zero. + */ + if (!in->unlinked) + retVal = yaffs_unlink_file_if_needed(in); + + deleted = in->deleted; + + if (retVal == YAFFS_OK && in->unlinked && !in->deleted) { + in->deleted = 1; + deleted = 1; + in->my_dev->n_deleted_files++; + yaffs_soft_del_file(in); + } + return deleted ? YAFFS_OK : YAFFS_FAIL; + } else { + /* The file has no data chunks so we toss it immediately */ + yaffs_free_tnode(in->my_dev, in->variant.file_variant.top); + in->variant.file_variant.top = NULL; + yaffs_generic_obj_del(in); + + return YAFFS_OK; + } +} + +static int yaffs_is_non_empty_dir(yaffs_obj_t *obj) +{ + return (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) && + !(ylist_empty(&obj->variant.dir_variant.children)); +} + +static int yaffs_del_dir(yaffs_obj_t *obj) +{ + /* First check that the directory is empty. */ + if (yaffs_is_non_empty_dir(obj)) + return YAFFS_FAIL; + + return yaffs_generic_obj_del(obj); +} + +static int yaffs_del_symlink(yaffs_obj_t *in) +{ + if(in->variant.symlink_variant.alias) + YFREE(in->variant.symlink_variant.alias); + in->variant.symlink_variant.alias=NULL; + + return yaffs_generic_obj_del(in); +} + +static int yaffs_del_link(yaffs_obj_t *in) +{ + /* remove this hardlink from the list assocaited with the equivalent + * object + */ + ylist_del_init(&in->hard_links); + return yaffs_generic_obj_del(in); +} + +int yaffs_del_obj(yaffs_obj_t *obj) +{ +int retVal = -1; + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + retVal = yaffs_del_file(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + if(!ylist_empty(&obj->variant.dir_variant.dirty)){ + T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->obj_id)); + ylist_del_init(&obj->variant.dir_variant.dirty); + } + return yaffs_del_dir(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + retVal = yaffs_del_symlink(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + retVal = yaffs_del_link(obj); + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + retVal = yaffs_generic_obj_del(obj); + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + retVal = 0; + break; /* should not happen. */ + } + + return retVal; +} + +static int yaffs_unlink_worker(yaffs_obj_t *obj) +{ + + int immediateDeletion = 0; + + if (!obj->my_inode) + immediateDeletion = 1; + + if(obj) + yaffs_update_parent(obj->parent); + + if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { + return yaffs_del_link(obj); + } else if (!ylist_empty(&obj->hard_links)) { + /* Curve ball: We're unlinking an object that has a hardlink. + * + * This problem arises because we are not strictly following + * The Linux link/inode model. + * + * We can't really delete the object. + * Instead, we do the following: + * - Select a hardlink. + * - Unhook it from the hard links + * - Move it from its parent directory (so that the rename can work) + * - Rename the object to the hardlink's name. + * - Delete the hardlink + */ + + yaffs_obj_t *hl; + yaffs_obj_t *parent; + int retVal; + YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; + + hl = ylist_entry(obj->hard_links.next, yaffs_obj_t, hard_links); + + yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1); + parent = hl->parent; + + ylist_del_init(&hl->hard_links); + + yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl); + + retVal = yaffs_change_obj_name(obj,parent, name, 0, 0); + + if (retVal == YAFFS_OK) + retVal = yaffs_generic_obj_del(hl); + + return retVal; + + } else if (immediateDeletion) { + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + return yaffs_del_file(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + ylist_del_init(&obj->variant.dir_variant.dirty); + return yaffs_del_dir(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + return yaffs_del_symlink(obj); + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + return yaffs_generic_obj_del(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + return YAFFS_FAIL; + } + } else if(yaffs_is_non_empty_dir(obj)) + return YAFFS_FAIL; + else + return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir, + _Y("unlinked"), 0, 0); +} + + +static int yaffs_unlink_obj(yaffs_obj_t *obj) +{ + + if (obj && obj->unlink_allowed) + return yaffs_unlink_worker(obj); + + return YAFFS_FAIL; + +} +int yaffs_unlinker(yaffs_obj_t *dir, const YCHAR *name) +{ + yaffs_obj_t *obj; + + obj = yaffs_find_by_name(dir, name); + return yaffs_unlink_obj(obj); +} + +/*----------------------- Initialisation Scanning ---------------------- */ + +void yaffs_handle_shadowed_obj(yaffs_dev_t *dev, int obj_id, + int backward_scanning) +{ + yaffs_obj_t *obj; + + if (!backward_scanning) { + /* Handle YAFFS1 forward scanning case + * For YAFFS1 we always do the deletion + */ + + } else { + /* Handle YAFFS2 case (backward scanning) + * If the shadowed object exists then ignore. + */ + obj = yaffs_find_by_number(dev, obj_id); + if(obj) + return; + } + + /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc. + * We put it in unlinked dir to be cleaned up after the scanning + */ + obj = + yaffs_find_or_create_by_number(dev, obj_id, + YAFFS_OBJECT_TYPE_FILE); + if (!obj) + return; + obj->is_shadowed = 1; + yaffs_add_obj_to_dir(dev->unlinked_dir, obj); + obj->variant.file_variant.shrink_size = 0; + obj->valid = 1; /* So that we don't read any other info for this file */ + +} + + +void yaffs_link_fixup(yaffs_dev_t *dev, yaffs_obj_t *hard_list) +{ + yaffs_obj_t *hl; + yaffs_obj_t *in; + + while (hard_list) { + hl = hard_list; + hard_list = (yaffs_obj_t *) (hard_list->hard_links.next); + + in = yaffs_find_by_number(dev, + hl->variant.hardlink_variant. + equiv_id); + + if (in) { + /* Add the hardlink pointers */ + hl->variant.hardlink_variant.equiv_obj = in; + ylist_add(&hl->hard_links, &in->hard_links); + } else { + /* Todo Need to report/handle this better. + * Got a problem... hardlink to a non-existant object + */ + hl->variant.hardlink_variant.equiv_obj = NULL; + YINIT_LIST_HEAD(&hl->hard_links); + + } + } +} + + +static void yaffs_strip_deleted_objs(yaffs_dev_t *dev) +{ + /* + * Sort out state of unlinked and deleted objects after scanning. + */ + struct ylist_head *i; + struct ylist_head *n; + yaffs_obj_t *l; + + if (dev->read_only) + return; + + /* Soft delete all the unlinked files */ + ylist_for_each_safe(i, n, + &dev->unlinked_dir->variant.dir_variant.children) { + if (i) { + l = ylist_entry(i, yaffs_obj_t, siblings); + yaffs_del_obj(l); + } + } + + ylist_for_each_safe(i, n, + &dev->del_dir->variant.dir_variant.children) { + if (i) { + l = ylist_entry(i, yaffs_obj_t, siblings); + yaffs_del_obj(l); + } + } + +} + +/* + * This code iterates through all the objects making sure that they are rooted. + * Any unrooted objects are re-rooted in lost+found. + * An object needs to be in one of: + * - Directly under deleted, unlinked + * - Directly or indirectly under root. + * + * Note: + * This code assumes that we don't ever change the current relationships between + * directories: + * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL + * lostNfound->parent == root_dir + * + * This fixes the problem where directories might have inadvertently been deleted + * leaving the object "hanging" without being rooted in the directory tree. + */ + +static int yaffs_has_null_parent(yaffs_dev_t *dev, yaffs_obj_t *obj) +{ + return (obj == dev->del_dir || + obj == dev->unlinked_dir|| + obj == dev->root_dir); +} + +static void yaffs_fix_hanging_objs(yaffs_dev_t *dev) +{ + yaffs_obj_t *obj; + yaffs_obj_t *parent; + int i; + struct ylist_head *lh; + struct ylist_head *n; + int depthLimit; + int hanging; + + if (dev->read_only) + return; + + /* Iterate through the objects in each hash entry, + * looking at each object. + * Make sure it is rooted. + */ + + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + ylist_for_each_safe(lh, n, &dev->obj_bucket[i].list) { + if (lh) { + obj = ylist_entry(lh, yaffs_obj_t, hash_link); + parent= obj->parent; + + if(yaffs_has_null_parent(dev,obj)){ + /* These directories are not hanging */ + hanging = 0; + } + else if(!parent || parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + hanging = 1; + else if(yaffs_has_null_parent(dev,parent)) + hanging = 0; + else { + /* + * Need to follow the parent chain to see if it is hanging. + */ + hanging = 0; + depthLimit=100; + + while(parent != dev->root_dir && + parent->parent && + parent->parent->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY && + depthLimit > 0){ + parent = parent->parent; + depthLimit--; + } + if(parent != dev->root_dir) + hanging = 1; + } + if(hanging){ + T(YAFFS_TRACE_SCAN, + (TSTR("Hanging object %d moved to lost and found" TENDSTR), + obj->obj_id)); + yaffs_add_obj_to_dir(dev->lost_n_found,obj); + } + } + } + } +} + + +/* + * Delete directory contents for cleaning up lost and found. + */ +static void yaffs_del_dir_contents(yaffs_obj_t *dir) +{ + yaffs_obj_t *obj; + struct ylist_head *lh; + struct ylist_head *n; + + if(dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + YBUG(); + + ylist_for_each_safe(lh, n, &dir->variant.dir_variant.children) { + if (lh) { + obj = ylist_entry(lh, yaffs_obj_t, siblings); + if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) + yaffs_del_dir_contents(obj); + + T(YAFFS_TRACE_SCAN, + (TSTR("Deleting lost_found object %d" TENDSTR), + obj->obj_id)); + + /* Need to use UnlinkObject since Delete would not handle + * hardlinked objects correctly. + */ + yaffs_unlink_obj(obj); + } + } + +} + +static void yaffs_empty_l_n_f(yaffs_dev_t *dev) +{ + yaffs_del_dir_contents(dev->lost_n_found); +} + +static void yaffs_check_obj_details_loaded(yaffs_obj_t *in) +{ + __u8 *chunkData; + yaffs_obj_header *oh; + yaffs_dev_t *dev; + yaffs_ext_tags tags; + int result; + int alloc_failed = 0; + + if (!in) + return; + + dev = in->my_dev; + +#if 0 + T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR), + in->obj_id, + in->lazy_loaded ? "not yet" : "already")); +#endif + + if (in->lazy_loaded && in->hdr_chunk > 0) { + in->lazy_loaded = 0; + chunkData = yaffs_get_temp_buffer(dev, __LINE__); + + result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunkData, &tags); + oh = (yaffs_obj_header *) chunkData; + + in->yst_mode = oh->yst_mode; +#ifdef CONFIG_YAFFS_WINCE + in->win_atime[0] = oh->win_atime[0]; + in->win_ctime[0] = oh->win_ctime[0]; + in->win_mtime[0] = oh->win_mtime[0]; + in->win_atime[1] = oh->win_atime[1]; + in->win_ctime[1] = oh->win_ctime[1]; + in->win_mtime[1] = oh->win_mtime[1]; +#else + in->yst_uid = oh->yst_uid; + in->yst_gid = oh->yst_gid; + in->yst_atime = oh->yst_atime; + in->yst_mtime = oh->yst_mtime; + in->yst_ctime = oh->yst_ctime; + in->yst_rdev = oh->yst_rdev; + +#endif + yaffs_set_obj_name_from_oh(in, oh); + + if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { + in->variant.symlink_variant.alias = + yaffs_clone_str(oh->alias); + if (!in->variant.symlink_variant.alias) + alloc_failed = 1; /* Not returned to caller */ + } + + yaffs_release_temp_buffer(dev, chunkData, __LINE__); + } +} + +/*------------------------------ Directory Functions ----------------------------- */ + +/* + *yaffs_update_parent() handles fixing a directories mtime and ctime when a new + * link (ie. name) is created or deleted in the directory. + * + * ie. + * create dir/a : update dir's mtime/ctime + * rm dir/a: update dir's mtime/ctime + * modify dir/a: don't update dir's mtimme/ctime + * + * This can be handled immediately or defered. Defering helps reduce the number + * of updates when many files in a directory are changed within a brief period. + * + * If the directory updating is defered then yaffs_update_dirty_dirs must be + * called periodically. + */ + +static void yaffs_update_parent(yaffs_obj_t *obj) +{ + yaffs_dev_t *dev; + if(!obj) + return; +#ifndef CONFIG_YAFFS_WINCE + + dev = obj->my_dev; + obj->dirty = 1; + obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME; + if(dev->param.defered_dir_update){ + struct ylist_head *link = &obj->variant.dir_variant.dirty; + + if(ylist_empty(link)){ + ylist_add(link,&dev->dirty_dirs); + T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->obj_id)); + } + + } else + yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); +#endif +} + +void yaffs_update_dirty_dirs(yaffs_dev_t *dev) +{ + struct ylist_head *link; + yaffs_obj_t *obj; + yaffs_dir_s *dS; + yaffs_obj_variant *oV; + + T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR))); + + while(!ylist_empty(&dev->dirty_dirs)){ + link = dev->dirty_dirs.next; + ylist_del_init(link); + + dS=ylist_entry(link,yaffs_dir_s,dirty); + oV = ylist_entry(dS,yaffs_obj_variant,dir_variant); + obj = ylist_entry(oV,yaffs_obj_t,variant); + + T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->obj_id)); + + if(obj->dirty) + yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); + } +} + +static void yaffs_remove_obj_from_dir(yaffs_obj_t *obj) +{ + yaffs_dev_t *dev = obj->my_dev; + yaffs_obj_t *parent; + + yaffs_verify_obj_in_dir(obj); + parent = obj->parent; + + yaffs_verify_dir(parent); + + if (dev && dev->param.remove_obj_fn) + dev->param.remove_obj_fn(obj); + + + ylist_del_init(&obj->siblings); + obj->parent = NULL; + + yaffs_verify_dir(parent); +} + +void yaffs_add_obj_to_dir(yaffs_obj_t *directory, + yaffs_obj_t *obj) +{ + if (!directory) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: Trying to add an object to a null pointer directory" + TENDSTR))); + YBUG(); + return; + } + if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: Trying to add an object to a non-directory" + TENDSTR))); + YBUG(); + } + + if (obj->siblings.prev == NULL) { + /* Not initialised */ + YBUG(); + } + + + yaffs_verify_dir(directory); + + yaffs_remove_obj_from_dir(obj); + + + /* Now add it */ + ylist_add(&obj->siblings, &directory->variant.dir_variant.children); + obj->parent = directory; + + if (directory == obj->my_dev->unlinked_dir + || directory == obj->my_dev->del_dir) { + obj->unlinked = 1; + obj->my_dev->n_unlinked_files++; + obj->rename_allowed = 0; + } + + yaffs_verify_dir(directory); + yaffs_verify_obj_in_dir(obj); +} + +yaffs_obj_t *yaffs_find_by_name(yaffs_obj_t *directory, + const YCHAR *name) +{ + int sum; + + struct ylist_head *i; + YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1]; + + yaffs_obj_t *l; + + if (!name) + return NULL; + + if (!directory) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: yaffs_find_by_name: null pointer directory" + TENDSTR))); + YBUG(); + return NULL; + } + if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: yaffs_find_by_name: non-directory" TENDSTR))); + YBUG(); + } + + sum = yaffs_calc_name_sum(name); + + ylist_for_each(i, &directory->variant.dir_variant.children) { + if (i) { + l = ylist_entry(i, yaffs_obj_t, siblings); + + if (l->parent != directory) + YBUG(); + + yaffs_check_obj_details_loaded(l); + + /* Special case for lost-n-found */ + if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { + if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) + return l; + } else if (yaffs_sum_cmp(l->sum, sum) || l->hdr_chunk <= 0) { + /* LostnFound chunk called Objxxx + * Do a real check + */ + yaffs_get_obj_name(l, buffer, + YAFFS_MAX_NAME_LENGTH + 1); + if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0) + return l; + } + } + } + + return NULL; +} + + +#if 0 +int yaffs_ApplyToDirectoryChildren(yaffs_obj_t *the_dir, + int (*fn) (yaffs_obj_t *)) +{ + struct ylist_head *i; + yaffs_obj_t *l; + + if (!the_dir) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: yaffs_find_by_name: null pointer directory" + TENDSTR))); + YBUG(); + return YAFFS_FAIL; + } + if (the_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: yaffs_find_by_name: non-directory" TENDSTR))); + YBUG(); + return YAFFS_FAIL; + } + + ylist_for_each(i, &the_dir->variant.dir_variant.children) { + if (i) { + l = ylist_entry(i, yaffs_obj_t, siblings); + if (l && !fn(l)) + return YAFFS_FAIL; + } + } + + return YAFFS_OK; + +} +#endif + +/* GetEquivalentObject dereferences any hard links to get to the + * actual object. + */ + +yaffs_obj_t *yaffs_get_equivalent_obj(yaffs_obj_t *obj) +{ + if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { + /* We want the object id of the equivalent object, not this one */ + obj = obj->variant.hardlink_variant.equiv_obj; + yaffs_check_obj_details_loaded(obj); + } + return obj; +} + +/* + * A note or two on object names. + * * If the object name is missing, we then make one up in the form objnnn + * + * * ASCII names are stored in the object header's name field from byte zero + * * Unicode names are historically stored starting from byte zero. + * + * Then there are automatic Unicode names... + * The purpose of these is to save names in a way that can be read as + * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII + * system to share files. + * + * These automatic unicode are stored slightly differently... + * - If the name can fit in the ASCII character space then they are saved as + * ascii names as per above. + * - If the name needs Unicode then the name is saved in Unicode + * starting at oh->name[1]. + + */ +static void yaffs_fix_null_name(yaffs_obj_t * obj,YCHAR * name, int buffer_size) +{ + /* Create an object name if we could not find one. */ + if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){ + YCHAR locName[20]; + YCHAR numString[20]; + YCHAR *x = &numString[19]; + unsigned v = obj->obj_id; + numString[19] = 0; + while(v>0){ + x--; + *x = '0' + (v % 10); + v /= 10; + } + /* make up a name */ + yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX); + yaffs_strcat(locName,x); + yaffs_strncpy(name, locName, buffer_size - 1); + } +} + +static void yaffs_load_name_from_oh(yaffs_dev_t *dev,YCHAR *name, const YCHAR *ohName, int bufferSize) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + if(dev->param.auto_unicode){ + if(*ohName){ + /* It is an ASCII name, so do an ASCII to unicode conversion */ + const char *asciiOhName = (const char *)ohName; + int n = bufferSize - 1; + while(n > 0 && *asciiOhName){ + *name = *asciiOhName; + name++; + asciiOhName++; + n--; + } + } else + yaffs_strncpy(name,ohName+1, bufferSize -1); + } else +#endif + yaffs_strncpy(name, ohName, bufferSize - 1); +} + + +static void yaffs_load_oh_from_name(yaffs_dev_t *dev, YCHAR *ohName, const YCHAR *name) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + + int isAscii; + YCHAR *w; + + if(dev->param.auto_unicode){ + + isAscii = 1; + w = name; + + /* Figure out if the name will fit in ascii character set */ + while(isAscii && *w){ + if((*w) & 0xff00) + isAscii = 0; + w++; + } + + if(isAscii){ + /* It is an ASCII name, so do a unicode to ascii conversion */ + char *asciiOhName = (char *)ohName; + int n = YAFFS_MAX_NAME_LENGTH - 1; + while(n > 0 && *name){ + *asciiOhName= *name; + name++; + asciiOhName++; + n--; + } + } else{ + /* It is a unicode name, so save starting at the second YCHAR */ + *ohName = 0; + yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2); + } + } + else +#endif + yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1); + +} + +int yaffs_get_obj_name(yaffs_obj_t * obj, YCHAR * name, int buffer_size) +{ + memset(name, 0, buffer_size * sizeof(YCHAR)); + + yaffs_check_obj_details_loaded(obj); + + if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { + yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1); + } +#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM + else if (obj->short_name[0]) { + yaffs_strcpy(name, obj->short_name); + } +#endif + else if(obj->hdr_chunk > 0) { + int result; + __u8 *buffer = yaffs_get_temp_buffer(obj->my_dev, __LINE__); + + yaffs_obj_header *oh = (yaffs_obj_header *) buffer; + + memset(buffer, 0, obj->my_dev->data_bytes_per_chunk); + + if (obj->hdr_chunk > 0) { + result = yaffs_rd_chunk_tags_nand(obj->my_dev, + obj->hdr_chunk, buffer, + NULL); + } + yaffs_load_name_from_oh(obj->my_dev,name,oh->name,buffer_size); + + yaffs_release_temp_buffer(obj->my_dev, buffer, __LINE__); + } + + yaffs_fix_null_name(obj,name,buffer_size); + + return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH); +} + + +int yaffs_get_obj_length(yaffs_obj_t *obj) +{ + /* Dereference any hard linking */ + obj = yaffs_get_equivalent_obj(obj); + + if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) + return obj->variant.file_variant.file_size; + if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){ + if(!obj->variant.symlink_variant.alias) + return 0; + return yaffs_strnlen(obj->variant.symlink_variant.alias,YAFFS_MAX_ALIAS_LENGTH); + } else { + /* Only a directory should drop through to here */ + return obj->my_dev->data_bytes_per_chunk; + } +} + +int yaffs_get_obj_link_count(yaffs_obj_t *obj) +{ + int count = 0; + struct ylist_head *i; + + if (!obj->unlinked) + count++; /* the object itself */ + + ylist_for_each(i, &obj->hard_links) + count++; /* add the hard links; */ + + return count; +} + +int yaffs_get_obj_inode(yaffs_obj_t *obj) +{ + obj = yaffs_get_equivalent_obj(obj); + + return obj->obj_id; +} + +unsigned yaffs_get_obj_type(yaffs_obj_t *obj) +{ + obj = yaffs_get_equivalent_obj(obj); + + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + return DT_REG; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + return DT_DIR; + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + return DT_LNK; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + return DT_REG; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + if (S_ISFIFO(obj->yst_mode)) + return DT_FIFO; + if (S_ISCHR(obj->yst_mode)) + return DT_CHR; + if (S_ISBLK(obj->yst_mode)) + return DT_BLK; + if (S_ISSOCK(obj->yst_mode)) + return DT_SOCK; + default: + return DT_REG; + break; + } +} + +YCHAR *yaffs_get_symlink_alias(yaffs_obj_t *obj) +{ + obj = yaffs_get_equivalent_obj(obj); + if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) + return yaffs_clone_str(obj->variant.symlink_variant.alias); + else + return yaffs_clone_str(_Y("")); +} + +#ifndef CONFIG_YAFFS_WINCE + +int yaffs_set_attribs(yaffs_obj_t *obj, struct iattr *attr) +{ + unsigned int valid = attr->ia_valid; + + if (valid & ATTR_MODE) + obj->yst_mode = attr->ia_mode; + if (valid & ATTR_UID) + obj->yst_uid = attr->ia_uid; + if (valid & ATTR_GID) + obj->yst_gid = attr->ia_gid; + + if (valid & ATTR_ATIME) + obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime); + if (valid & ATTR_CTIME) + obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime); + if (valid & ATTR_MTIME) + obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime); + + if (valid & ATTR_SIZE) + yaffs_resize_file(obj, attr->ia_size); + + yaffs_update_oh(obj, NULL, 1, 0, 0, NULL); + + return YAFFS_OK; + +} +int yaffs_get_attribs(yaffs_obj_t *obj, struct iattr *attr) +{ + unsigned int valid = 0; + + attr->ia_mode = obj->yst_mode; + valid |= ATTR_MODE; + attr->ia_uid = obj->yst_uid; + valid |= ATTR_UID; + attr->ia_gid = obj->yst_gid; + valid |= ATTR_GID; + + Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime; + valid |= ATTR_ATIME; + Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime; + valid |= ATTR_CTIME; + Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime; + valid |= ATTR_MTIME; + + attr->ia_size = yaffs_get_file_size(obj); + valid |= ATTR_SIZE; + + attr->ia_valid = valid; + + return YAFFS_OK; +} + +#endif + + +static int yaffs_do_xattrib_mod(yaffs_obj_t *obj, int set, const YCHAR *name, const void *value, int size, int flags) +{ + yaffs_xattr_mod xmod; + + int result; + + xmod.set = set; + xmod.name = name; + xmod.data = value; + xmod.size = size; + xmod.flags = flags; + xmod.result = -ENOSPC; + + result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod); + + if(result > 0) + return xmod.result; + else + return -ENOSPC; +} + +static int yaffs_apply_xattrib_mod(yaffs_obj_t *obj, char *buffer, yaffs_xattr_mod *xmod) +{ + int retval = 0; + int x_offs = sizeof(yaffs_obj_header); + yaffs_dev_t *dev = obj->my_dev; + int x_size = dev->data_bytes_per_chunk - sizeof(yaffs_obj_header); + + char * x_buffer = buffer + x_offs; + + if(xmod->set) + retval = nval_set(x_buffer, x_size, xmod->name, xmod->data, xmod->size, xmod->flags); + else + retval = nval_del(x_buffer, x_size, xmod->name); + + obj->has_xattr = nval_hasvalues(x_buffer, x_size); + obj->xattr_known = 1; + + xmod->result = retval; + + return retval; +} + +static int yaffs_do_xattrib_fetch(yaffs_obj_t *obj, const YCHAR *name, void *value, int size) +{ + char *buffer = NULL; + int result; + yaffs_ext_tags tags; + yaffs_dev_t *dev = obj->my_dev; + int x_offs = sizeof(yaffs_obj_header); + int x_size = dev->data_bytes_per_chunk - sizeof(yaffs_obj_header); + + char * x_buffer; + + int retval = 0; + + if(obj->hdr_chunk < 1) + return -ENODATA; + + /* If we know that the object has no xattribs then don't do all the + * reading and parsing. + */ + if(obj->xattr_known && !obj->has_xattr){ + if(name) + return -ENODATA; + else + return 0; + } + + buffer = (char *) yaffs_get_temp_buffer(dev, __LINE__); + if(!buffer) + return -ENOMEM; + + result = yaffs_rd_chunk_tags_nand(dev,obj->hdr_chunk, (__u8 *)buffer, &tags); + + if(result != YAFFS_OK) + retval = -ENOENT; + else{ + x_buffer = buffer + x_offs; + + if (!obj->xattr_known){ + obj->has_xattr = nval_hasvalues(x_buffer, x_size); + obj->xattr_known = 1; + } + + if(name) + retval = nval_get(x_buffer, x_size, name, value, size); + else + retval = nval_list(x_buffer, x_size, value,size); + } + yaffs_release_temp_buffer(dev,(__u8 *)buffer,__LINE__); + return retval; +} + +int yaffs_set_xattrib(yaffs_obj_t *obj, const YCHAR *name, const void * value, int size, int flags) +{ + return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags); +} + +int yaffs_remove_xattrib(yaffs_obj_t *obj, const YCHAR *name) +{ + return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0); +} + +int yaffs_get_xattrib(yaffs_obj_t *obj, const YCHAR *name, void *value, int size) +{ + return yaffs_do_xattrib_fetch(obj, name, value, size); +} + +int yaffs_list_xattrib(yaffs_obj_t *obj, char *buffer, int size) +{ + return yaffs_do_xattrib_fetch(obj, NULL, buffer,size); +} + + + +#if 0 +int yaffs_dump_obj(yaffs_obj_t *obj) +{ + YCHAR name[257]; + + yaffs_get_obj_name(obj, name, YAFFS_MAX_NAME_LENGTH + 1); + + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d" + " chunk %d type %d size %d\n" + TENDSTR), obj->obj_id, yaffs_get_obj_inode(obj), name, + obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdr_chunk, + yaffs_get_obj_type(obj), yaffs_get_obj_length(obj))); + + return YAFFS_OK; +} +#endif + +/*---------------------------- Initialisation code -------------------------------------- */ + +static int yaffs_cehck_dev_fns(const yaffs_dev_t *dev) +{ + + /* Common functions, gotta have */ + if (!dev->param.erase_fn || !dev->param.initialise_flash_fn) + return 0; + +#ifdef CONFIG_YAFFS_YAFFS2 + + /* Can use the "with tags" style interface for yaffs1 or yaffs2 */ + if (dev->param.write_chunk_tags_fn && + dev->param.read_chunk_tags_fn && + !dev->param.write_chunk_fn && + !dev->param.read_chunk_fn && + dev->param.bad_block_fn && + dev->param.query_block_fn) + return 1; +#endif + + /* Can use the "spare" style interface for yaffs1 */ + if (!dev->param.is_yaffs2 && + !dev->param.write_chunk_tags_fn && + !dev->param.read_chunk_tags_fn && + dev->param.write_chunk_fn && + dev->param.read_chunk_fn && + !dev->param.bad_block_fn && + !dev->param.query_block_fn) + return 1; + + return 0; /* bad */ +} + + +static int yaffs_create_initial_dir(yaffs_dev_t *dev) +{ + /* Initialise the unlinked, deleted, root and lost and found directories */ + + dev->lost_n_found = dev->root_dir = NULL; + dev->unlinked_dir = dev->del_dir = NULL; + + dev->unlinked_dir = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR); + + dev->del_dir = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR); + + dev->root_dir = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT, + YAFFS_ROOT_MODE | S_IFDIR); + dev->lost_n_found = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND, + YAFFS_LOSTNFOUND_MODE | S_IFDIR); + + if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir && dev->del_dir) { + yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found); + return YAFFS_OK; + } + + return YAFFS_FAIL; +} + +int yaffs_guts_initialise(yaffs_dev_t *dev) +{ + int init_failed = 0; + unsigned x; + int bits; + + T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_guts_initialise()" TENDSTR))); + + /* Check stuff that must be set */ + + if (!dev) { + T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR))); + return YAFFS_FAIL; + } + + dev->internal_start_block = dev->param.start_block; + dev->internal_end_block = dev->param.end_block; + dev->block_offset = 0; + dev->chunk_offset = 0; + dev->n_free_chunks = 0; + + dev->gc_block = 0; + + if (dev->param.start_block == 0) { + dev->internal_start_block = dev->param.start_block + 1; + dev->internal_end_block = dev->param.end_block + 1; + dev->block_offset = 1; + dev->chunk_offset = dev->param.chunks_per_block; + } + + /* Check geometry parameters. */ + + if ((!dev->param.inband_tags && dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 1024) || + (!dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 512) || + (dev->param.inband_tags && !dev->param.is_yaffs2) || + dev->param.chunks_per_block < 2 || + dev->param.n_reserved_blocks < 2 || + dev->internal_start_block <= 0 || + dev->internal_end_block <= 0 || + dev->internal_end_block <= (dev->internal_start_block + dev->param.n_reserved_blocks + 2)) { /* otherwise it is too small */ + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d " + TENDSTR), dev->param.total_bytes_per_chunk, dev->param.is_yaffs2 ? "2" : "", dev->param.inband_tags)); + return YAFFS_FAIL; + } + + if (yaffs_init_nand(dev) != YAFFS_OK) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: InitialiseNAND failed" TENDSTR))); + return YAFFS_FAIL; + } + + /* Sort out space for inband tags, if required */ + if (dev->param.inband_tags) + dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk - sizeof(yaffs_PackedTags2TagsPart); + else + dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk; + + /* Got the right mix of functions? */ + if (!yaffs_cehck_dev_fns(dev)) { + /* Function missing */ + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("yaffs: device function(s) missing or wrong\n" TENDSTR))); + + return YAFFS_FAIL; + } + + /* This is really a compilation check. */ + if (!yaffs_check_structures()) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs_check_structures failed\n" TENDSTR))); + return YAFFS_FAIL; + } + + if (dev->is_mounted) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: device already mounted\n" TENDSTR))); + return YAFFS_FAIL; + } + + /* Finished with most checks. One or two more checks happen later on too. */ + + dev->is_mounted = 1; + + /* OK now calculate a few things for the device */ + + /* + * Calculate all the chunk size manipulation numbers: + */ + x = dev->data_bytes_per_chunk; + /* We always use dev->chunk_shift and dev->chunk_div */ + dev->chunk_shift = Shifts(x); + x >>= dev->chunk_shift; + dev->chunk_div = x; + /* We only use chunk mask if chunk_div is 1 */ + dev->chunk_mask = (1<<dev->chunk_shift) - 1; + + /* + * Calculate chunk_grp_bits. + * We need to find the next power of 2 > than internal_end_block + */ + + x = dev->param.chunks_per_block * (dev->internal_end_block + 1); + + bits = ShiftsGE(x); + + /* Set up tnode width if wide tnodes are enabled. */ + if (!dev->param.wide_tnodes_disabled) { + /* bits must be even so that we end up with 32-bit words */ + if (bits & 1) + bits++; + if (bits < 16) + dev->tnode_width = 16; + else + dev->tnode_width = bits; + } else + dev->tnode_width = 16; + + dev->tnode_mask = (1<<dev->tnode_width)-1; + + /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled), + * so if the bitwidth of the + * chunk range we're using is greater than 16 we need + * to figure out chunk shift and chunk_grp_size + */ + + if (bits <= dev->tnode_width) + dev->chunk_grp_bits = 0; + else + dev->chunk_grp_bits = bits - dev->tnode_width; + + dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0)/8; + if(dev->tnode_size < sizeof(yaffs_tnode_t)) + dev->tnode_size = sizeof(yaffs_tnode_t); + + dev->chunk_grp_size = 1 << dev->chunk_grp_bits; + + if (dev->param.chunks_per_block < dev->chunk_grp_size) { + /* We have a problem because the soft delete won't work if + * the chunk group size > chunks per block. + * This can be remedied by using larger "virtual blocks". + */ + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: chunk group too large\n" TENDSTR))); + + return YAFFS_FAIL; + } + + /* OK, we've finished verifying the device, lets continue with initialisation */ + + /* More device initialisation */ + dev->all_gcs = 0; + dev->passive_gc_count = 0; + dev->oldest_dirty_gc_count = 0; + dev->bg_gcs = 0; + dev->gc_block_finder = 0; + dev->buffered_block = -1; + dev->doing_buffered_block_rewrite = 0; + dev->n_deleted_files = 0; + dev->n_bg_deletions = 0; + dev->n_unlinked_files = 0; + dev->n_ecc_fixed = 0; + dev->n_ecc_unfixed = 0; + dev->n_tags_ecc_fixed = 0; + dev->n_tags_ecc_unfixed = 0; + dev->n_erase_failures = 0; + dev->n_erased_blocks = 0; + dev->gc_disable= 0; + dev->has_pending_prioritised_gc = 1; /* Assume the worst for now, will get fixed on first GC */ + YINIT_LIST_HEAD(&dev->dirty_dirs); + dev->oldest_dirty_seq = 0; + dev->oldest_dirty_block = 0; + + /* Initialise temporary buffers and caches. */ + if (!yaffs_init_tmp_buffers(dev)) + init_failed = 1; + + dev->cache = NULL; + dev->gc_cleanup_list = NULL; + + + if (!init_failed && + dev->param.n_caches > 0) { + int i; + void *buf; + int cacheBytes = dev->param.n_caches * sizeof(yaffs_cache_t); + + if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES) + dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES; + + dev->cache = YMALLOC(cacheBytes); + + buf = (__u8 *) dev->cache; + + if (dev->cache) + memset(dev->cache, 0, cacheBytes); + + for (i = 0; i < dev->param.n_caches && buf; i++) { + dev->cache[i].object = NULL; + dev->cache[i].last_use = 0; + dev->cache[i].dirty = 0; + dev->cache[i].data = buf = YMALLOC_DMA(dev->param.total_bytes_per_chunk); + } + if (!buf) + init_failed = 1; + + dev->cache_last_use = 0; + } + + dev->cache_hits = 0; + + if (!init_failed) { + dev->gc_cleanup_list = YMALLOC(dev->param.chunks_per_block * sizeof(__u32)); + if (!dev->gc_cleanup_list) + init_failed = 1; + } + + if (dev->param.is_yaffs2) + dev->param.use_header_file_size = 1; + + if (!init_failed && !yaffs_init_blocks(dev)) + init_failed = 1; + + yaffs_init_tnodes_and_objs(dev); + + if (!init_failed && !yaffs_create_initial_dir(dev)) + init_failed = 1; + + + if (!init_failed) { + /* Now scan the flash. */ + if (dev->param.is_yaffs2) { + if (yaffs2_checkpt_restore(dev)) { + yaffs_check_obj_details_loaded(dev->root_dir); + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: restored from checkpoint" TENDSTR))); + } else { + + /* Clean up the mess caused by an aborted checkpoint load + * and scan backwards. + */ + yaffs_deinit_blocks(dev); + + yaffs_deinit_tnodes_and_objs(dev); + + dev->n_erased_blocks = 0; + dev->n_free_chunks = 0; + dev->alloc_block = -1; + dev->alloc_page = -1; + dev->n_deleted_files = 0; + dev->n_unlinked_files = 0; + dev->n_bg_deletions = 0; + + if (!init_failed && !yaffs_init_blocks(dev)) + init_failed = 1; + + yaffs_init_tnodes_and_objs(dev); + + if (!init_failed && !yaffs_create_initial_dir(dev)) + init_failed = 1; + + if (!init_failed && !yaffs2_scan_backwards(dev)) + init_failed = 1; + } + } else if (!yaffs1_scan(dev)) + init_failed = 1; + + yaffs_strip_deleted_objs(dev); + yaffs_fix_hanging_objs(dev); + if(dev->param.empty_lost_n_found) + yaffs_empty_l_n_f(dev); + } + + if (init_failed) { + /* Clean up the mess */ + T(YAFFS_TRACE_TRACING, + (TSTR("yaffs: yaffs_guts_initialise() aborted.\n" TENDSTR))); + + yaffs_deinitialise(dev); + return YAFFS_FAIL; + } + + /* Zero out stats */ + dev->n_page_reads = 0; + dev->n_page_writes = 0; + dev->n_erasures = 0; + dev->n_gc_copies = 0; + dev->n_retired_writes = 0; + + dev->n_retired_blocks = 0; + + yaffs_verify_free_chunks(dev); + yaffs_verify_blocks(dev); + + /* Clean up any aborted checkpoint data */ + if(!dev->is_checkpointed && dev->blocks_in_checkpt > 0) + yaffs2_checkpt_invalidate(dev); + + T(YAFFS_TRACE_TRACING, + (TSTR("yaffs: yaffs_guts_initialise() done.\n" TENDSTR))); + return YAFFS_OK; + +} + +void yaffs_deinitialise(yaffs_dev_t *dev) +{ + if (dev->is_mounted) { + int i; + + yaffs_deinit_blocks(dev); + yaffs_deinit_tnodes_and_objs(dev); + if (dev->param.n_caches > 0 && + dev->cache) { + + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].data) + YFREE(dev->cache[i].data); + dev->cache[i].data = NULL; + } + + YFREE(dev->cache); + dev->cache = NULL; + } + + YFREE(dev->gc_cleanup_list); + + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) + YFREE(dev->temp_buffer[i].buffer); + + dev->is_mounted = 0; + + if (dev->param.deinitialise_flash_fn) + dev->param.deinitialise_flash_fn(dev); + } +} + +int yaffs_count_free_chunks(yaffs_dev_t *dev) +{ + int nFree=0; + int b; + + yaffs_block_info_t *blk; + + blk = dev->block_info; + for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) { + switch (blk->block_state) { + case YAFFS_BLOCK_STATE_EMPTY: + case YAFFS_BLOCK_STATE_ALLOCATING: + case YAFFS_BLOCK_STATE_COLLECTING: + case YAFFS_BLOCK_STATE_FULL: + nFree += + (dev->param.chunks_per_block - blk->pages_in_use + + blk->soft_del_pages); + break; + default: + break; + } + blk++; + } + + return nFree; +} + +int yaffs_get_n_free_chunks(yaffs_dev_t *dev) +{ + /* This is what we report to the outside world */ + + int nFree; + int nDirtyCacheChunks; + int blocksForCheckpoint; + int i; + +#if 1 + nFree = dev->n_free_chunks; +#else + nFree = yaffs_count_free_chunks(dev); +#endif + + nFree += dev->n_deleted_files; + + /* Now count the number of dirty chunks in the cache and subtract those */ + + for (nDirtyCacheChunks = 0, i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].dirty) + nDirtyCacheChunks++; + } + + nFree -= nDirtyCacheChunks; + + nFree -= ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block); + + /* Now we figure out how much to reserve for the checkpoint and report that... */ + blocksForCheckpoint = yaffs_calc_checkpt_blocks_required(dev); + + nFree -= (blocksForCheckpoint * dev->param.chunks_per_block); + + if (nFree < 0) + nFree = 0; + + return nFree; + +} + + +/*---------------------------------------- YAFFS test code ----------------------*/ + +#define yaffs_check_struct(structure, syze, name) \ + do { \ + if (sizeof(structure) != syze) { \ + T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\ + name, syze, (int) sizeof(structure))); \ + return YAFFS_FAIL; \ + } \ + } while (0) + +static int yaffs_check_structures(void) +{ +/* yaffs_check_struct(yaffs_tags_t,8,"yaffs_tags_t"); */ +/* yaffs_check_struct(yaffs_tags_union_t,8,"yaffs_tags_union_t"); */ +/* yaffs_check_struct(yaffs_spare,16,"yaffs_spare"); */ +/* yaffs_check_struct(yaffs_tnode_t, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_tnode_t"); */ + +#ifndef CONFIG_YAFFS_WINCE + yaffs_check_struct(yaffs_obj_header, 512, "yaffs_obj_header"); +#endif + return YAFFS_OK; +} |