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spiffs_check.c
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/*
* spiffs_check.c
*
* Contains functionality for checking file system consistency
* and mending problems.
* Three levels of consistency checks are implemented:
*
* Look up consistency
* Checks if indices in lookup pages are coherent with page headers
* Object index consistency
* Checks if there are any orphaned object indices (missing object index headers).
* If an object index is found but not its header, the object index is deleted.
* This is critical for the following page consistency check.
* Page consistency
* Checks for pages that ought to be indexed, ought not to be indexed, are multiple indexed
*
*
* Created on: Jul 7, 2013
* Author: petera
*/
#include "spiffs.h"
#include "spiffs_nucleus.h"
#if !SPIFFS_READ_ONLY
#if SPIFFS_HAL_CALLBACK_EXTRA
#define CHECK_CB(_fs, _type, _rep, _arg1, _arg2) \
do { \
if ((_fs)->check_cb_f) (_fs)->check_cb_f((_fs), (_type), (_rep), (_arg1), (_arg2)); \
} while (0)
#else
#define CHECK_CB(_fs, _type, _rep, _arg1, _arg2) \
do { \
if ((_fs)->check_cb_f) (_fs)->check_cb_f((_type), (_rep), (_arg1), (_arg2)); \
} while (0)
#endif
//---------------------------------------
// Look up consistency
// searches in the object indices and returns the referenced page index given
// the object id and the data span index
// destroys fs->lu_work
static s32_t spiffs_object_get_data_page_index_reference(
spiffs *fs,
spiffs_obj_id obj_id,
spiffs_span_ix data_spix,
spiffs_page_ix *pix,
spiffs_page_ix *objix_pix) {
s32_t res;
// calculate object index span index for given data page span index
spiffs_span_ix objix_spix = SPIFFS_OBJ_IX_ENTRY_SPAN_IX(fs, data_spix);
// find obj index for obj id and span index
res = spiffs_obj_lu_find_id_and_span(fs, obj_id | SPIFFS_OBJ_ID_IX_FLAG, objix_spix, 0, objix_pix);
SPIFFS_CHECK_RES(res);
// load obj index entry
u32_t addr = SPIFFS_PAGE_TO_PADDR(fs, *objix_pix);
if (objix_spix == 0) {
// get referenced page from object index header
addr += sizeof(spiffs_page_object_ix_header) + data_spix * sizeof(spiffs_page_ix);
} else {
// get referenced page from object index
addr += sizeof(spiffs_page_object_ix) + SPIFFS_OBJ_IX_ENTRY(fs, data_spix) * sizeof(spiffs_page_ix);
}
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ, 0, addr, sizeof(spiffs_page_ix), (u8_t *)pix);
return res;
}
// copies page contents to a new page
static s32_t spiffs_rewrite_page(spiffs *fs, spiffs_page_ix cur_pix, spiffs_page_header *p_hdr, spiffs_page_ix *new_pix) {
s32_t res;
res = spiffs_page_allocate_data(fs, p_hdr->obj_id, p_hdr, 0,0,0,0, new_pix);
SPIFFS_CHECK_RES(res);
res = spiffs_phys_cpy(fs, 0,
SPIFFS_PAGE_TO_PADDR(fs, *new_pix) + sizeof(spiffs_page_header),
SPIFFS_PAGE_TO_PADDR(fs, cur_pix) + sizeof(spiffs_page_header),
SPIFFS_DATA_PAGE_SIZE(fs));
SPIFFS_CHECK_RES(res);
return res;
}
// rewrites the object index for given object id and replaces the
// data page index to a new page index
static s32_t spiffs_rewrite_index(spiffs *fs, spiffs_obj_id obj_id, spiffs_span_ix data_spix, spiffs_page_ix new_data_pix, spiffs_page_ix objix_pix) {
s32_t res;
spiffs_block_ix bix;
int entry;
spiffs_page_ix free_pix;
obj_id |= SPIFFS_OBJ_ID_IX_FLAG;
// find free entry
res = spiffs_obj_lu_find_free(fs, fs->free_cursor_block_ix, fs->free_cursor_obj_lu_entry, &bix, &entry);
SPIFFS_CHECK_RES(res);
free_pix = SPIFFS_OBJ_LOOKUP_ENTRY_TO_PIX(fs, bix, entry);
// calculate object index span index for given data page span index
spiffs_span_ix objix_spix = SPIFFS_OBJ_IX_ENTRY_SPAN_IX(fs, data_spix);
if (objix_spix == 0) {
// calc index in index header
entry = data_spix;
} else {
// calc entry in index
entry = SPIFFS_OBJ_IX_ENTRY(fs, data_spix);
}
// load index
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, objix_pix), SPIFFS_CFG_LOG_PAGE_SZ(fs), fs->lu_work);
SPIFFS_CHECK_RES(res);
spiffs_page_header *objix_p_hdr = (spiffs_page_header *)fs->lu_work;
// be ultra safe, double check header against provided data
if (objix_p_hdr->obj_id != obj_id) {
spiffs_page_delete(fs, free_pix);
return SPIFFS_ERR_CHECK_OBJ_ID_MISM;
}
if (objix_p_hdr->span_ix != objix_spix) {
spiffs_page_delete(fs, free_pix);
return SPIFFS_ERR_CHECK_SPIX_MISM;
}
if ((objix_p_hdr->flags & (SPIFFS_PH_FLAG_USED | SPIFFS_PH_FLAG_IXDELE | SPIFFS_PH_FLAG_INDEX |
SPIFFS_PH_FLAG_FINAL | SPIFFS_PH_FLAG_DELET)) !=
(SPIFFS_PH_FLAG_IXDELE | SPIFFS_PH_FLAG_DELET)) {
spiffs_page_delete(fs, free_pix);
return SPIFFS_ERR_CHECK_FLAGS_BAD;
}
// rewrite in mem
if (objix_spix == 0) {
((spiffs_page_ix*)((u8_t *)fs->lu_work + sizeof(spiffs_page_object_ix_header)))[data_spix] = new_data_pix;
} else {
((spiffs_page_ix*)((u8_t *)fs->lu_work + sizeof(spiffs_page_object_ix)))[SPIFFS_OBJ_IX_ENTRY(fs, data_spix)] = new_data_pix;
}
res = _spiffs_wr(fs, SPIFFS_OP_T_OBJ_DA | SPIFFS_OP_C_UPDT,
0, SPIFFS_PAGE_TO_PADDR(fs, free_pix), SPIFFS_CFG_LOG_PAGE_SZ(fs), fs->lu_work);
SPIFFS_CHECK_RES(res);
res = _spiffs_wr(fs, SPIFFS_OP_T_OBJ_LU | SPIFFS_OP_C_UPDT,
0, SPIFFS_BLOCK_TO_PADDR(fs, SPIFFS_BLOCK_FOR_PAGE(fs, free_pix)) + SPIFFS_OBJ_LOOKUP_ENTRY_FOR_PAGE(fs, free_pix) * sizeof(spiffs_page_ix),
sizeof(spiffs_obj_id),
(u8_t *)&obj_id);
SPIFFS_CHECK_RES(res);
res = spiffs_page_delete(fs, objix_pix);
return res;
}
// deletes an object just by marking object index header as deleted
static s32_t spiffs_delete_obj_lazy(spiffs *fs, spiffs_obj_id obj_id) {
spiffs_page_ix objix_hdr_pix;
s32_t res;
res = spiffs_obj_lu_find_id_and_span(fs, obj_id, 0, 0, &objix_hdr_pix);
if (res == SPIFFS_ERR_NOT_FOUND) {
return SPIFFS_OK;
}
SPIFFS_CHECK_RES(res);
u8_t flags = 0xff;
#if SPIFFS_NO_BLIND_WRITES
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, objix_hdr_pix) + offsetof(spiffs_page_header, flags),
sizeof(flags), &flags);
SPIFFS_CHECK_RES(res);
#endif
flags &= ~SPIFFS_PH_FLAG_IXDELE;
res = _spiffs_wr(fs, SPIFFS_OP_T_OBJ_LU | SPIFFS_OP_C_UPDT,
0, SPIFFS_PAGE_TO_PADDR(fs, objix_hdr_pix) + offsetof(spiffs_page_header, flags),
sizeof(flags), &flags);
return res;
}
// validates the given look up entry
static s32_t spiffs_lookup_check_validate(spiffs *fs, spiffs_obj_id lu_obj_id, spiffs_page_header *p_hdr,
spiffs_page_ix cur_pix, spiffs_block_ix cur_block, int cur_entry, int *reload_lu) {
(void)cur_block;
(void)cur_entry;
u8_t delete_page = 0;
s32_t res = SPIFFS_OK;
spiffs_page_ix objix_pix;
spiffs_page_ix ref_pix;
// check validity, take actions
if (((lu_obj_id == SPIFFS_OBJ_ID_DELETED) && (p_hdr->flags & SPIFFS_PH_FLAG_DELET)) ||
((lu_obj_id == SPIFFS_OBJ_ID_FREE) && (p_hdr->flags & SPIFFS_PH_FLAG_USED) == 0)) {
// look up entry deleted / free but used in page header
SPIFFS_CHECK_DBG("LU: pix "_SPIPRIpg" deleted/free in lu but not on page\n", cur_pix);
*reload_lu = 1;
delete_page = 1;
if (p_hdr->flags & SPIFFS_PH_FLAG_INDEX) {
// header says data page
// data page can be removed if not referenced by some object index
res = spiffs_object_get_data_page_index_reference(fs, p_hdr->obj_id, p_hdr->span_ix, &ref_pix, &objix_pix);
if (res == SPIFFS_ERR_NOT_FOUND) {
// no object with this id, so remove page safely
res = SPIFFS_OK;
} else {
SPIFFS_CHECK_RES(res);
if (ref_pix == cur_pix) {
// data page referenced by object index but deleted in lu
// copy page to new place and re-write the object index to new place
spiffs_page_ix new_pix;
res = spiffs_rewrite_page(fs, cur_pix, p_hdr, &new_pix);
SPIFFS_CHECK_DBG("LU: FIXUP: data page not found elsewhere, rewriting "_SPIPRIpg" to new page "_SPIPRIpg"\n", cur_pix, new_pix);
SPIFFS_CHECK_RES(res);
*reload_lu = 1;
SPIFFS_CHECK_DBG("LU: FIXUP: "_SPIPRIpg" rewritten to "_SPIPRIpg", affected objix_pix "_SPIPRIpg"\n", cur_pix, new_pix, objix_pix);
res = spiffs_rewrite_index(fs, p_hdr->obj_id, p_hdr->span_ix, new_pix, objix_pix);
if (res <= _SPIFFS_ERR_CHECK_FIRST && res > _SPIFFS_ERR_CHECK_LAST) {
// index bad also, cannot mend this file
SPIFFS_CHECK_DBG("LU: FIXUP: index bad "_SPIPRIi", cannot mend!\n", res);
res = spiffs_page_delete(fs, new_pix);
SPIFFS_CHECK_RES(res);
res = spiffs_delete_obj_lazy(fs, p_hdr->obj_id);
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_DELETE_BAD_FILE, p_hdr->obj_id, 0);
} else {
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_FIX_INDEX, p_hdr->obj_id, p_hdr->span_ix);
}
SPIFFS_CHECK_RES(res);
}
}
} else {
// header says index page
// index page can be removed if other index with same obj_id and spanix is found
res = spiffs_obj_lu_find_id_and_span(fs, p_hdr->obj_id | SPIFFS_OBJ_ID_IX_FLAG, p_hdr->span_ix, cur_pix, 0);
if (res == SPIFFS_ERR_NOT_FOUND) {
// no such index page found, check for a data page amongst page headers
// lu cannot be trusted
res = spiffs_obj_lu_find_id_and_span_by_phdr(fs, p_hdr->obj_id | SPIFFS_OBJ_ID_IX_FLAG, 0, 0, 0);
if (res == SPIFFS_OK) { // ignore other errors
// got a data page also, assume lu corruption only, rewrite to new page
spiffs_page_ix new_pix;
res = spiffs_rewrite_page(fs, cur_pix, p_hdr, &new_pix);
SPIFFS_CHECK_DBG("LU: FIXUP: ix page with data not found elsewhere, rewriting "_SPIPRIpg" to new page "_SPIPRIpg"\n", cur_pix, new_pix);
SPIFFS_CHECK_RES(res);
*reload_lu = 1;
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_FIX_LOOKUP, p_hdr->obj_id, p_hdr->span_ix);
}
} else {
SPIFFS_CHECK_RES(res);
}
}
}
if (lu_obj_id != SPIFFS_OBJ_ID_FREE && lu_obj_id != SPIFFS_OBJ_ID_DELETED) {
// look up entry used
if ((p_hdr->obj_id | SPIFFS_OBJ_ID_IX_FLAG) != (lu_obj_id | SPIFFS_OBJ_ID_IX_FLAG)) {
SPIFFS_CHECK_DBG("LU: pix "_SPIPRIpg" differ in obj_id lu:"_SPIPRIid" ph:"_SPIPRIid"\n", cur_pix, lu_obj_id, p_hdr->obj_id);
delete_page = 1;
if ((p_hdr->flags & SPIFFS_PH_FLAG_DELET) == 0 ||
(p_hdr->flags & SPIFFS_PH_FLAG_FINAL) ||
(p_hdr->flags & (SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_IXDELE)) == 0) {
// page deleted or not finalized, just remove it
} else {
if (p_hdr->flags & SPIFFS_PH_FLAG_INDEX) {
// if data page, check for reference to this page
res = spiffs_object_get_data_page_index_reference(fs, p_hdr->obj_id, p_hdr->span_ix, &ref_pix, &objix_pix);
if (res == SPIFFS_ERR_NOT_FOUND) {
// no object with this id, so remove page safely
res = SPIFFS_OK;
} else {
SPIFFS_CHECK_RES(res);
// if found, rewrite page with object id, update index, and delete current
if (ref_pix == cur_pix) {
spiffs_page_ix new_pix;
res = spiffs_rewrite_page(fs, cur_pix, p_hdr, &new_pix);
SPIFFS_CHECK_RES(res);
res = spiffs_rewrite_index(fs, p_hdr->obj_id, p_hdr->span_ix, new_pix, objix_pix);
if (res <= _SPIFFS_ERR_CHECK_FIRST && res > _SPIFFS_ERR_CHECK_LAST) {
// index bad also, cannot mend this file
SPIFFS_CHECK_DBG("LU: FIXUP: index bad "_SPIPRIi", cannot mend!\n", res);
res = spiffs_page_delete(fs, new_pix);
SPIFFS_CHECK_RES(res);
res = spiffs_delete_obj_lazy(fs, p_hdr->obj_id);
*reload_lu = 1;
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_DELETE_BAD_FILE, p_hdr->obj_id, 0);
}
SPIFFS_CHECK_RES(res);
}
}
} else {
// else if index, check for other pages with both obj_id's and spanix
spiffs_page_ix objix_pix_lu, objix_pix_ph;
// see if other object index page exists for lookup obj id and span index
res = spiffs_obj_lu_find_id_and_span(fs, lu_obj_id | SPIFFS_OBJ_ID_IX_FLAG, p_hdr->span_ix, 0, &objix_pix_lu);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
objix_pix_lu = 0;
}
SPIFFS_CHECK_RES(res);
// see if other object index exists for page header obj id and span index
res = spiffs_obj_lu_find_id_and_span(fs, p_hdr->obj_id | SPIFFS_OBJ_ID_IX_FLAG, p_hdr->span_ix, 0, &objix_pix_ph);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
objix_pix_ph = 0;
}
SPIFFS_CHECK_RES(res);
// if both obj_id's found, just delete current
if (objix_pix_ph == 0 || objix_pix_lu == 0) {
// otherwise try finding first corresponding data pages
spiffs_page_ix data_pix_lu, data_pix_ph;
// see if other data page exists for look up obj id and span index
res = spiffs_obj_lu_find_id_and_span(fs, lu_obj_id & ~SPIFFS_OBJ_ID_IX_FLAG, 0, 0, &data_pix_lu);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
objix_pix_lu = 0;
}
SPIFFS_CHECK_RES(res);
// see if other data page exists for page header obj id and span index
res = spiffs_obj_lu_find_id_and_span(fs, p_hdr->obj_id & ~SPIFFS_OBJ_ID_IX_FLAG, 0, 0, &data_pix_ph);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
objix_pix_ph = 0;
}
SPIFFS_CHECK_RES(res);
spiffs_page_header new_ph;
new_ph.flags = 0xff & ~(SPIFFS_PH_FLAG_USED | SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_FINAL);
new_ph.span_ix = p_hdr->span_ix;
spiffs_page_ix new_pix;
if ((objix_pix_lu && data_pix_lu && data_pix_ph && objix_pix_ph == 0) ||
(objix_pix_lu == 0 && data_pix_ph && objix_pix_ph == 0)) {
// got a data page for page header obj id
// rewrite as obj_id_ph
new_ph.obj_id = p_hdr->obj_id | SPIFFS_OBJ_ID_IX_FLAG;
res = spiffs_rewrite_page(fs, cur_pix, &new_ph, &new_pix);
SPIFFS_CHECK_DBG("LU: FIXUP: rewrite page "_SPIPRIpg" as "_SPIPRIid" to pix "_SPIPRIpg"\n", cur_pix, new_ph.obj_id, new_pix);
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_FIX_LOOKUP, p_hdr->obj_id, p_hdr->span_ix);
SPIFFS_CHECK_RES(res);
*reload_lu = 1;
} else if ((objix_pix_ph && data_pix_ph && data_pix_lu && objix_pix_lu == 0) ||
(objix_pix_ph == 0 && data_pix_lu && objix_pix_lu == 0)) {
// got a data page for look up obj id
// rewrite as obj_id_lu
new_ph.obj_id = lu_obj_id | SPIFFS_OBJ_ID_IX_FLAG;
SPIFFS_CHECK_DBG("LU: FIXUP: rewrite page "_SPIPRIpg" as "_SPIPRIid"\n", cur_pix, new_ph.obj_id);
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_FIX_LOOKUP, p_hdr->obj_id, p_hdr->span_ix);
res = spiffs_rewrite_page(fs, cur_pix, &new_ph, &new_pix);
SPIFFS_CHECK_RES(res);
*reload_lu = 1;
} else {
// cannot safely do anything
SPIFFS_CHECK_DBG("LU: FIXUP: nothing to do, just delete\n");
}
}
}
}
} else if (((lu_obj_id & SPIFFS_OBJ_ID_IX_FLAG) && (p_hdr->flags & SPIFFS_PH_FLAG_INDEX)) ||
((lu_obj_id & SPIFFS_OBJ_ID_IX_FLAG) == 0 && (p_hdr->flags & SPIFFS_PH_FLAG_INDEX) == 0)) {
SPIFFS_CHECK_DBG("LU: "_SPIPRIpg" lu/page index marking differ\n", cur_pix);
spiffs_page_ix data_pix, objix_pix_d;
// see if other data page exists for given obj id and span index
res = spiffs_obj_lu_find_id_and_span(fs, lu_obj_id & ~SPIFFS_OBJ_ID_IX_FLAG, p_hdr->span_ix, cur_pix, &data_pix);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
data_pix = 0;
}
SPIFFS_CHECK_RES(res);
// see if other object index exists for given obj id and span index
res = spiffs_obj_lu_find_id_and_span(fs, lu_obj_id | SPIFFS_OBJ_ID_IX_FLAG, p_hdr->span_ix, cur_pix, &objix_pix_d);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
objix_pix_d = 0;
}
SPIFFS_CHECK_RES(res);
delete_page = 1;
// if other data page exists and object index exists, just delete page
if (data_pix && objix_pix_d) {
SPIFFS_CHECK_DBG("LU: FIXUP: other index and data page exists, simply remove\n");
} else
// if only data page exists, make this page index
if (data_pix && objix_pix_d == 0) {
SPIFFS_CHECK_DBG("LU: FIXUP: other data page exists, make this index\n");
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_FIX_INDEX, lu_obj_id, p_hdr->span_ix);
spiffs_page_header new_ph;
spiffs_page_ix new_pix;
new_ph.flags = 0xff & ~(SPIFFS_PH_FLAG_USED | SPIFFS_PH_FLAG_FINAL | SPIFFS_PH_FLAG_INDEX);
new_ph.obj_id = lu_obj_id | SPIFFS_OBJ_ID_IX_FLAG;
new_ph.span_ix = p_hdr->span_ix;
res = spiffs_page_allocate_data(fs, new_ph.obj_id, &new_ph, 0, 0, 0, 1, &new_pix);
SPIFFS_CHECK_RES(res);
res = spiffs_phys_cpy(fs, 0, SPIFFS_PAGE_TO_PADDR(fs, new_pix) + sizeof(spiffs_page_header),
SPIFFS_PAGE_TO_PADDR(fs, cur_pix) + sizeof(spiffs_page_header),
SPIFFS_CFG_LOG_PAGE_SZ(fs) - sizeof(spiffs_page_header));
SPIFFS_CHECK_RES(res);
} else
// if only index exists, make data page
if (data_pix == 0 && objix_pix_d) {
SPIFFS_CHECK_DBG("LU: FIXUP: other index page exists, make this data\n");
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_FIX_LOOKUP, lu_obj_id, p_hdr->span_ix);
spiffs_page_header new_ph;
spiffs_page_ix new_pix;
new_ph.flags = 0xff & ~(SPIFFS_PH_FLAG_USED | SPIFFS_PH_FLAG_FINAL);
new_ph.obj_id = lu_obj_id & ~SPIFFS_OBJ_ID_IX_FLAG;
new_ph.span_ix = p_hdr->span_ix;
res = spiffs_page_allocate_data(fs, new_ph.obj_id, &new_ph, 0, 0, 0, 1, &new_pix);
SPIFFS_CHECK_RES(res);
res = spiffs_phys_cpy(fs, 0, SPIFFS_PAGE_TO_PADDR(fs, new_pix) + sizeof(spiffs_page_header),
SPIFFS_PAGE_TO_PADDR(fs, cur_pix) + sizeof(spiffs_page_header),
SPIFFS_CFG_LOG_PAGE_SZ(fs) - sizeof(spiffs_page_header));
SPIFFS_CHECK_RES(res);
} else {
// if nothing exists, we cannot safely make a decision - delete
}
}
else if ((p_hdr->flags & SPIFFS_PH_FLAG_DELET) == 0) {
SPIFFS_CHECK_DBG("LU: pix "_SPIPRIpg" busy in lu but deleted on page\n", cur_pix);
delete_page = 1;
} else if ((p_hdr->flags & SPIFFS_PH_FLAG_FINAL)) {
SPIFFS_CHECK_DBG("LU: pix "_SPIPRIpg" busy but not final\n", cur_pix);
// page can be removed if not referenced by object index
*reload_lu = 1;
res = spiffs_object_get_data_page_index_reference(fs, lu_obj_id, p_hdr->span_ix, &ref_pix, &objix_pix);
if (res == SPIFFS_ERR_NOT_FOUND) {
// no object with this id, so remove page safely
res = SPIFFS_OK;
delete_page = 1;
} else {
SPIFFS_CHECK_RES(res);
if (ref_pix != cur_pix) {
SPIFFS_CHECK_DBG("LU: FIXUP: other finalized page is referred, just delete\n");
delete_page = 1;
} else {
// page referenced by object index but not final
// just finalize
SPIFFS_CHECK_DBG("LU: FIXUP: unfinalized page is referred, finalizing\n");
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_FIX_LOOKUP, p_hdr->obj_id, p_hdr->span_ix);
u8_t flags = 0xff;
#if SPIFFS_NO_BLIND_WRITES
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_DA | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, cur_pix) + offsetof(spiffs_page_header, flags),
sizeof(flags), &flags);
SPIFFS_CHECK_RES(res);
#endif
flags &= ~SPIFFS_PH_FLAG_FINAL;
res = _spiffs_wr(fs, SPIFFS_OP_T_OBJ_DA | SPIFFS_OP_C_UPDT,
0, SPIFFS_PAGE_TO_PADDR(fs, cur_pix) + offsetof(spiffs_page_header, flags),
sizeof(flags), &flags);
}
}
}
}
if (delete_page) {
SPIFFS_CHECK_DBG("LU: FIXUP: deleting page "_SPIPRIpg"\n", cur_pix);
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_DELETE_PAGE, cur_pix, 0);
res = spiffs_page_delete(fs, cur_pix);
SPIFFS_CHECK_RES(res);
}
return res;
}
static s32_t spiffs_lookup_check_v(spiffs *fs, spiffs_obj_id obj_id, spiffs_block_ix cur_block, int cur_entry,
const void *user_const_p, void *user_var_p) {
(void)user_const_p;
(void)user_var_p;
s32_t res = SPIFFS_OK;
spiffs_page_header p_hdr;
spiffs_page_ix cur_pix = SPIFFS_OBJ_LOOKUP_ENTRY_TO_PIX(fs, cur_block, cur_entry);
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_PROGRESS,
(cur_block * 256)/fs->block_count, 0);
// load header
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, cur_pix), sizeof(spiffs_page_header), (u8_t*)&p_hdr);
SPIFFS_CHECK_RES(res);
int reload_lu = 0;
res = spiffs_lookup_check_validate(fs, obj_id, &p_hdr, cur_pix, cur_block, cur_entry, &reload_lu);
SPIFFS_CHECK_RES(res);
if (res == SPIFFS_OK) {
return reload_lu ? SPIFFS_VIS_COUNTINUE_RELOAD : SPIFFS_VIS_COUNTINUE;
}
return res;
}
// Scans all object look up. For each entry, corresponding page header is checked for validity.
// If an object index header page is found, this is also checked
s32_t spiffs_lookup_consistency_check(spiffs *fs, u8_t check_all_objects) {
(void)check_all_objects;
s32_t res = SPIFFS_OK;
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_PROGRESS, 0, 0);
res = spiffs_obj_lu_find_entry_visitor(fs, 0, 0, 0, 0, spiffs_lookup_check_v, 0, 0, 0, 0);
if (res == SPIFFS_VIS_END) {
res = SPIFFS_OK;
}
if (res != SPIFFS_OK) {
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_ERROR, res, 0);
}
CHECK_CB(fs, SPIFFS_CHECK_LOOKUP, SPIFFS_CHECK_PROGRESS, 256, 0);
return res;
}
//---------------------------------------
// Page consistency
// Scans all pages (except lu pages), reserves 4 bits in working memory for each page
// bit 0: 0 == FREE|DELETED, 1 == USED
// bit 1: 0 == UNREFERENCED, 1 == REFERENCED
// bit 2: 0 == NOT_INDEX, 1 == INDEX
// bit 3: unused
// A consistent file system will have only pages being
// * x000 free, unreferenced, not index
// * x011 used, referenced only once, not index
// * x101 used, unreferenced, index
// The working memory might not fit all pages so several scans might be needed
static s32_t spiffs_page_consistency_check_i(spiffs *fs) {
const u32_t bits = 4;
const u32_t pages_per_scan = SPIFFS_CFG_LOG_PAGE_SZ(fs) * 8 / bits;
s32_t res = SPIFFS_OK;
spiffs_page_ix pix_offset = 0;
// for each range of pages fitting into work memory
while (pix_offset < SPIFFS_PAGES_PER_BLOCK(fs) * fs->block_count) {
// set this flag to abort all checks and rescan the page range
u8_t restart = 0;
memset(fs->work, 0, SPIFFS_CFG_LOG_PAGE_SZ(fs));
spiffs_block_ix cur_block = 0;
// build consistency bitmap for id range traversing all blocks
while (!restart && cur_block < fs->block_count) {
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_PROGRESS,
(pix_offset*256)/(SPIFFS_PAGES_PER_BLOCK(fs) * fs->block_count) +
((((cur_block * pages_per_scan * 256)/ (SPIFFS_PAGES_PER_BLOCK(fs) * fs->block_count))) / fs->block_count),
0);
// traverse each page except for lookup pages
spiffs_page_ix cur_pix = SPIFFS_OBJ_LOOKUP_PAGES(fs) + SPIFFS_PAGES_PER_BLOCK(fs) * cur_block;
while (!restart && cur_pix < SPIFFS_PAGES_PER_BLOCK(fs) * (cur_block+1)) {
//if ((cur_pix & 0xff) == 0)
// SPIFFS_CHECK_DBG("PA: processing pix "_SPIPRIpg", block "_SPIPRIbl" of pix "_SPIPRIpg", block "_SPIPRIbl"\n",
// cur_pix, cur_block, SPIFFS_PAGES_PER_BLOCK(fs) * fs->block_count, fs->block_count);
// read header
spiffs_page_header p_hdr;
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, cur_pix), sizeof(spiffs_page_header), (u8_t*)&p_hdr);
SPIFFS_CHECK_RES(res);
u8_t within_range = (cur_pix >= pix_offset && cur_pix < pix_offset + pages_per_scan);
const u32_t pix_byte_ix = (cur_pix - pix_offset) / (8/bits);
const u8_t pix_bit_ix = (cur_pix & ((8/bits)-1)) * bits;
if (within_range &&
(p_hdr.flags & SPIFFS_PH_FLAG_DELET) && (p_hdr.flags & SPIFFS_PH_FLAG_USED) == 0) {
// used
fs->work[pix_byte_ix] |= (1<<(pix_bit_ix + 0));
}
if ((p_hdr.flags & SPIFFS_PH_FLAG_DELET) &&
(p_hdr.flags & SPIFFS_PH_FLAG_IXDELE) &&
(p_hdr.flags & (SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_USED)) == 0) {
// found non-deleted index
if (within_range) {
fs->work[pix_byte_ix] |= (1<<(pix_bit_ix + 2));
}
// load non-deleted index
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, cur_pix), SPIFFS_CFG_LOG_PAGE_SZ(fs), fs->lu_work);
SPIFFS_CHECK_RES(res);
// traverse index for referenced pages
spiffs_page_ix *object_page_index;
spiffs_page_header *objix_p_hdr = (spiffs_page_header *)fs->lu_work;
int entries;
int i;
spiffs_span_ix data_spix_offset;
if (p_hdr.span_ix == 0) {
// object header page index
entries = SPIFFS_OBJ_HDR_IX_LEN(fs);
data_spix_offset = 0;
object_page_index = (spiffs_page_ix *)((u8_t *)fs->lu_work + sizeof(spiffs_page_object_ix_header));
} else {
// object page index
entries = SPIFFS_OBJ_IX_LEN(fs);
data_spix_offset = SPIFFS_OBJ_HDR_IX_LEN(fs) + SPIFFS_OBJ_IX_LEN(fs) * (p_hdr.span_ix - 1);
object_page_index = (spiffs_page_ix *)((u8_t *)fs->lu_work + sizeof(spiffs_page_object_ix));
}
// for all entries in index
for (i = 0; !restart && i < entries; i++) {
spiffs_page_ix rpix = object_page_index[i];
u8_t rpix_within_range = rpix >= pix_offset && rpix < pix_offset + pages_per_scan;
if ((rpix != (spiffs_page_ix)-1 && rpix > SPIFFS_MAX_PAGES(fs))
|| (rpix_within_range && SPIFFS_IS_LOOKUP_PAGE(fs, rpix))) {
// bad reference
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg"x bad pix / LU referenced from page "_SPIPRIpg"\n",
rpix, cur_pix);
// check for data page elsewhere
spiffs_page_ix data_pix;
res = spiffs_obj_lu_find_id_and_span(fs, objix_p_hdr->obj_id & ~SPIFFS_OBJ_ID_IX_FLAG,
data_spix_offset + i, 0, &data_pix);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
data_pix = 0;
}
SPIFFS_CHECK_RES(res);
if (data_pix == 0) {
// if not, allocate free page
spiffs_page_header new_ph;
new_ph.flags = 0xff & ~(SPIFFS_PH_FLAG_USED | SPIFFS_PH_FLAG_FINAL);
new_ph.obj_id = objix_p_hdr->obj_id & ~SPIFFS_OBJ_ID_IX_FLAG;
new_ph.span_ix = data_spix_offset + i;
res = spiffs_page_allocate_data(fs, new_ph.obj_id, &new_ph, 0, 0, 0, 1, &data_pix);
SPIFFS_CHECK_RES(res);
SPIFFS_CHECK_DBG("PA: FIXUP: found no existing data page, created new @ "_SPIPRIpg"\n", data_pix);
}
// remap index
SPIFFS_CHECK_DBG("PA: FIXUP: rewriting index pix "_SPIPRIpg"\n", cur_pix);
res = spiffs_rewrite_index(fs, objix_p_hdr->obj_id | SPIFFS_OBJ_ID_IX_FLAG,
data_spix_offset + i, data_pix, cur_pix);
if (res <= _SPIFFS_ERR_CHECK_FIRST && res > _SPIFFS_ERR_CHECK_LAST) {
// index bad also, cannot mend this file
SPIFFS_CHECK_DBG("PA: FIXUP: index bad "_SPIPRIi", cannot mend - delete object\n", res);
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_DELETE_BAD_FILE, objix_p_hdr->obj_id, 0);
// delete file
res = spiffs_page_delete(fs, cur_pix);
} else {
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_FIX_INDEX, objix_p_hdr->obj_id, objix_p_hdr->span_ix);
}
SPIFFS_CHECK_RES(res);
restart = 1;
} else if (rpix_within_range) {
// valid reference
// read referenced page header
spiffs_page_header rp_hdr;
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, rpix), sizeof(spiffs_page_header), (u8_t*)&rp_hdr);
SPIFFS_CHECK_RES(res);
// cross reference page header check
if (rp_hdr.obj_id != (p_hdr.obj_id & ~SPIFFS_OBJ_ID_IX_FLAG) ||
rp_hdr.span_ix != data_spix_offset + i ||
(rp_hdr.flags & (SPIFFS_PH_FLAG_DELET | SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_USED)) !=
(SPIFFS_PH_FLAG_DELET | SPIFFS_PH_FLAG_INDEX)) {
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg" has inconsistent page header ix id/span:"_SPIPRIid"/"_SPIPRIsp", ref id/span:"_SPIPRIid"/"_SPIPRIsp" flags:"_SPIPRIfl"\n",
rpix, p_hdr.obj_id & ~SPIFFS_OBJ_ID_IX_FLAG, data_spix_offset + i,
rp_hdr.obj_id, rp_hdr.span_ix, rp_hdr.flags);
// try finding correct page
spiffs_page_ix data_pix;
res = spiffs_obj_lu_find_id_and_span(fs, p_hdr.obj_id & ~SPIFFS_OBJ_ID_IX_FLAG,
data_spix_offset + i, rpix, &data_pix);
if (res == SPIFFS_ERR_NOT_FOUND) {
res = SPIFFS_OK;
data_pix = 0;
}
SPIFFS_CHECK_RES(res);
if (data_pix == 0) {
// not found, this index is badly borked
SPIFFS_CHECK_DBG("PA: FIXUP: index bad, delete object id "_SPIPRIid"\n", p_hdr.obj_id);
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_DELETE_BAD_FILE, p_hdr.obj_id, 0);
res = spiffs_delete_obj_lazy(fs, p_hdr.obj_id);
SPIFFS_CHECK_RES(res);
break;
} else {
// found it, so rewrite index
SPIFFS_CHECK_DBG("PA: FIXUP: found correct data pix "_SPIPRIpg", rewrite ix pix "_SPIPRIpg" id "_SPIPRIid"\n",
data_pix, cur_pix, p_hdr.obj_id);
res = spiffs_rewrite_index(fs, p_hdr.obj_id, data_spix_offset + i, data_pix, cur_pix);
if (res <= _SPIFFS_ERR_CHECK_FIRST && res > _SPIFFS_ERR_CHECK_LAST) {
// index bad also, cannot mend this file
SPIFFS_CHECK_DBG("PA: FIXUP: index bad "_SPIPRIi", cannot mend!\n", res);
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_DELETE_BAD_FILE, p_hdr.obj_id, 0);
res = spiffs_delete_obj_lazy(fs, p_hdr.obj_id);
} else {
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_FIX_INDEX, p_hdr.obj_id, p_hdr.span_ix);
}
SPIFFS_CHECK_RES(res);
restart = 1;
}
}
else {
// mark rpix as referenced
const u32_t rpix_byte_ix = (rpix - pix_offset) / (8/bits);
const u8_t rpix_bit_ix = (rpix & ((8/bits)-1)) * bits;
if (fs->work[rpix_byte_ix] & (1<<(rpix_bit_ix + 1))) {
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg" multiple referenced from page "_SPIPRIpg"\n",
rpix, cur_pix);
// Here, we should have fixed all broken references - getting this means there
// must be multiple files with same object id. Only solution is to delete
// the object which is referring to this page
SPIFFS_CHECK_DBG("PA: FIXUP: removing object "_SPIPRIid" and page "_SPIPRIpg"\n",
p_hdr.obj_id, cur_pix);
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_DELETE_BAD_FILE, p_hdr.obj_id, 0);
res = spiffs_delete_obj_lazy(fs, p_hdr.obj_id);
SPIFFS_CHECK_RES(res);
// extra precaution, delete this page also
res = spiffs_page_delete(fs, cur_pix);
SPIFFS_CHECK_RES(res);
restart = 1;
}
fs->work[rpix_byte_ix] |= (1<<(rpix_bit_ix + 1));
}
}
} // for all index entries
} // found index
// next page
cur_pix++;
}
// next block
cur_block++;
}
// check consistency bitmap
if (!restart) {
spiffs_page_ix objix_pix;
spiffs_page_ix rpix;
u32_t byte_ix;
u8_t bit_ix;
for (byte_ix = 0; !restart && byte_ix < SPIFFS_CFG_LOG_PAGE_SZ(fs); byte_ix++) {
for (bit_ix = 0; !restart && bit_ix < 8/bits; bit_ix ++) {
u8_t bitmask = (fs->work[byte_ix] >> (bit_ix * bits)) & 0x7;
spiffs_page_ix cur_pix = pix_offset + byte_ix * (8/bits) + bit_ix;
// 000 ok - free, unreferenced, not index
if (bitmask == 0x1) {
// 001
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg" USED, UNREFERENCED, not index\n", cur_pix);
u8_t rewrite_ix_to_this = 0;
u8_t delete_page = 0;
// check corresponding object index entry
spiffs_page_header p_hdr;
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, cur_pix), sizeof(spiffs_page_header), (u8_t*)&p_hdr);
SPIFFS_CHECK_RES(res);
res = spiffs_object_get_data_page_index_reference(fs, p_hdr.obj_id, p_hdr.span_ix,
&rpix, &objix_pix);
if (res == SPIFFS_OK) {
if (((rpix == (spiffs_page_ix)-1 || rpix > SPIFFS_MAX_PAGES(fs)) || (SPIFFS_IS_LOOKUP_PAGE(fs, rpix)))) {
// pointing to a bad page altogether, rewrite index to this
rewrite_ix_to_this = 1;
SPIFFS_CHECK_DBG("PA: corresponding ref is bad: "_SPIPRIpg", rewrite to this "_SPIPRIpg"\n", rpix, cur_pix);
} else {
// pointing to something else, check what
spiffs_page_header rp_hdr;
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, rpix), sizeof(spiffs_page_header), (u8_t*)&rp_hdr);
SPIFFS_CHECK_RES(res);
if (((p_hdr.obj_id & ~SPIFFS_OBJ_ID_IX_FLAG) == rp_hdr.obj_id) &&
((rp_hdr.flags & (SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_DELET | SPIFFS_PH_FLAG_USED | SPIFFS_PH_FLAG_FINAL)) ==
(SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_DELET))) {
// pointing to something else valid, just delete this page then
SPIFFS_CHECK_DBG("PA: corresponding ref is good but different: "_SPIPRIpg", delete this "_SPIPRIpg"\n", rpix, cur_pix);
delete_page = 1;
} else {
// pointing to something weird, update index to point to this page instead
if (rpix != cur_pix) {
SPIFFS_CHECK_DBG("PA: corresponding ref is weird: "_SPIPRIpg" %s%s%s%s, rewrite this "_SPIPRIpg"\n", rpix,
(rp_hdr.flags & SPIFFS_PH_FLAG_INDEX) ? "" : "INDEX ",
(rp_hdr.flags & SPIFFS_PH_FLAG_DELET) ? "" : "DELETED ",
(rp_hdr.flags & SPIFFS_PH_FLAG_USED) ? "NOTUSED " : "",
(rp_hdr.flags & SPIFFS_PH_FLAG_FINAL) ? "NOTFINAL " : "",
cur_pix);
rewrite_ix_to_this = 1;
} else {
// should not happen, destined for fubar
}
}
}
} else if (res == SPIFFS_ERR_NOT_FOUND) {
SPIFFS_CHECK_DBG("PA: corresponding ref not found, delete "_SPIPRIpg"\n", cur_pix);
delete_page = 1;
res = SPIFFS_OK;
}
if (rewrite_ix_to_this) {
// if pointing to invalid page, redirect index to this page
SPIFFS_CHECK_DBG("PA: FIXUP: rewrite index id "_SPIPRIid" data spix "_SPIPRIsp" to point to this pix: "_SPIPRIpg"\n",
p_hdr.obj_id, p_hdr.span_ix, cur_pix);
res = spiffs_rewrite_index(fs, p_hdr.obj_id, p_hdr.span_ix, cur_pix, objix_pix);
if (res <= _SPIFFS_ERR_CHECK_FIRST && res > _SPIFFS_ERR_CHECK_LAST) {
// index bad also, cannot mend this file
SPIFFS_CHECK_DBG("PA: FIXUP: index bad "_SPIPRIi", cannot mend!\n", res);
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_DELETE_BAD_FILE, p_hdr.obj_id, 0);
res = spiffs_page_delete(fs, cur_pix);
SPIFFS_CHECK_RES(res);
res = spiffs_delete_obj_lazy(fs, p_hdr.obj_id);
} else {
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_FIX_INDEX, p_hdr.obj_id, p_hdr.span_ix);
}
SPIFFS_CHECK_RES(res);
restart = 1;
continue;
} else if (delete_page) {
SPIFFS_CHECK_DBG("PA: FIXUP: deleting page "_SPIPRIpg"\n", cur_pix);
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_DELETE_PAGE, cur_pix, 0);
res = spiffs_page_delete(fs, cur_pix);
}
SPIFFS_CHECK_RES(res);
}
if (bitmask == 0x2) {
// 010
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg" FREE, REFERENCED, not index\n", cur_pix);
// no op, this should be taken care of when checking valid references
}
// 011 ok - busy, referenced, not index
if (bitmask == 0x4) {
// 100
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg" FREE, unreferenced, INDEX\n", cur_pix);
// this should never happen, major fubar
}
// 101 ok - busy, unreferenced, index
if (bitmask == 0x6) {
// 110
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg" FREE, REFERENCED, INDEX\n", cur_pix);
// no op, this should be taken care of when checking valid references
}
if (bitmask == 0x7) {
// 111
SPIFFS_CHECK_DBG("PA: pix "_SPIPRIpg" USED, REFERENCED, INDEX\n", cur_pix);
// no op, this should be taken care of when checking valid references
}
}
}
}
SPIFFS_CHECK_DBG("PA: processed "_SPIPRIpg", restart "_SPIPRIi"\n", pix_offset, restart);
// next page range
if (!restart) {
pix_offset += pages_per_scan;
}
} // while page range not reached end
return res;
}
// Checks consistency amongst all pages and fixes irregularities
s32_t spiffs_page_consistency_check(spiffs *fs) {
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_PROGRESS, 0, 0);
s32_t res = spiffs_page_consistency_check_i(fs);
if (res != SPIFFS_OK) {
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_ERROR, res, 0);
}
CHECK_CB(fs, SPIFFS_CHECK_PAGE, SPIFFS_CHECK_PROGRESS, 256, 0);
return res;
}
//---------------------------------------
// Object index consistency
// searches for given object id in temporary object id index,
// returns the index or -1
static int spiffs_object_index_search(spiffs *fs, spiffs_obj_id obj_id) {
u32_t i;
spiffs_obj_id *obj_table = (spiffs_obj_id *)fs->work;
obj_id &= ~SPIFFS_OBJ_ID_IX_FLAG;
for (i = 0; i < SPIFFS_CFG_LOG_PAGE_SZ(fs) / sizeof(spiffs_obj_id); i++) {
if ((obj_table[i] & ~SPIFFS_OBJ_ID_IX_FLAG) == obj_id) {
return i;
}
}
return -1;
}
static s32_t spiffs_object_index_consistency_check_v(spiffs *fs, spiffs_obj_id obj_id, spiffs_block_ix cur_block,
int cur_entry, const void *user_const_p, void *user_var_p) {
(void)user_const_p;
s32_t res_c = SPIFFS_VIS_COUNTINUE;
s32_t res = SPIFFS_OK;
u32_t *log_ix = (u32_t*)user_var_p;
spiffs_obj_id *obj_table = (spiffs_obj_id *)fs->work;
CHECK_CB(fs, SPIFFS_CHECK_INDEX, SPIFFS_CHECK_PROGRESS,
(cur_block * 256)/fs->block_count, 0);
if (obj_id != SPIFFS_OBJ_ID_FREE && obj_id != SPIFFS_OBJ_ID_DELETED && (obj_id & SPIFFS_OBJ_ID_IX_FLAG)) {
spiffs_page_header p_hdr;
spiffs_page_ix cur_pix = SPIFFS_OBJ_LOOKUP_ENTRY_TO_PIX(fs, cur_block, cur_entry);
// load header
res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_LU2 | SPIFFS_OP_C_READ,
0, SPIFFS_PAGE_TO_PADDR(fs, cur_pix), sizeof(spiffs_page_header), (u8_t*)&p_hdr);
SPIFFS_CHECK_RES(res);
if (p_hdr.span_ix == 0 &&
(p_hdr.flags & (SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_FINAL | SPIFFS_PH_FLAG_DELET | SPIFFS_PH_FLAG_IXDELE)) ==
(SPIFFS_PH_FLAG_DELET)) {
SPIFFS_CHECK_DBG("IX: pix "_SPIPRIpg", obj id:"_SPIPRIid" spix:"_SPIPRIsp" header not fully deleted - deleting\n",
cur_pix, obj_id, p_hdr.span_ix);
CHECK_CB(fs, SPIFFS_CHECK_INDEX, SPIFFS_CHECK_DELETE_PAGE, cur_pix, obj_id);
res = spiffs_page_delete(fs, cur_pix);
SPIFFS_CHECK_RES(res);
return res_c;
}
if ((p_hdr.flags & (SPIFFS_PH_FLAG_INDEX | SPIFFS_PH_FLAG_FINAL | SPIFFS_PH_FLAG_DELET | SPIFFS_PH_FLAG_IXDELE)) ==
(SPIFFS_PH_FLAG_DELET | SPIFFS_PH_FLAG_IXDELE)) {
return res_c;
}
if (p_hdr.span_ix == 0) {
// objix header page, register objid as reachable
int r = spiffs_object_index_search(fs, obj_id);
if (r == -1) {
// not registered, do it
obj_table[*log_ix] = obj_id & ~SPIFFS_OBJ_ID_IX_FLAG;
(*log_ix)++;
if (*log_ix >= SPIFFS_CFG_LOG_PAGE_SZ(fs) / sizeof(spiffs_obj_id)) {
*log_ix = 0;
}
}
} else { // span index
// objix page, see if header can be found
int r = spiffs_object_index_search(fs, obj_id);
u8_t delete = 0;
if (r == -1) {
// not in temporary index, try finding it
spiffs_page_ix objix_hdr_pix;
res = spiffs_obj_lu_find_id_and_span(fs, obj_id | SPIFFS_OBJ_ID_IX_FLAG, 0, 0, &objix_hdr_pix);
res_c = SPIFFS_VIS_COUNTINUE_RELOAD;
if (res == SPIFFS_OK) {
// found, register as reachable
obj_table[*log_ix] = obj_id & ~SPIFFS_OBJ_ID_IX_FLAG;
} else if (res == SPIFFS_ERR_NOT_FOUND) {
// not found, register as unreachable
delete = 1;
obj_table[*log_ix] = obj_id | SPIFFS_OBJ_ID_IX_FLAG;
} else {
SPIFFS_CHECK_RES(res);
}
(*log_ix)++;
if (*log_ix >= SPIFFS_CFG_LOG_PAGE_SZ(fs) / sizeof(spiffs_obj_id)) {
*log_ix = 0;
}
} else {
// in temporary index, check reachable flag
if ((obj_table[r] & SPIFFS_OBJ_ID_IX_FLAG)) {
// registered as unreachable
delete = 1;
}
}
if (delete) {
SPIFFS_CHECK_DBG("IX: FIXUP: pix "_SPIPRIpg", obj id:"_SPIPRIid" spix:"_SPIPRIsp" is orphan index - deleting\n",
cur_pix, obj_id, p_hdr.span_ix);
CHECK_CB(fs, SPIFFS_CHECK_INDEX, SPIFFS_CHECK_DELETE_ORPHANED_INDEX, cur_pix, obj_id);
res = spiffs_page_delete(fs, cur_pix);
SPIFFS_CHECK_RES(res);
}
} // span index
} // valid object index id
return res_c;
}
// Removes orphaned and partially deleted index pages.
// Scans for index pages. When an index page is found, corresponding index header is searched for.
// If no such page exists, the index page cannot be reached as no index header exists and must be
// deleted.
s32_t spiffs_object_index_consistency_check(spiffs *fs) {
s32_t res = SPIFFS_OK;
// impl note:
// fs->work is used for a temporary object index memory, listing found object ids and
// indicating whether they can be reached or not. Acting as a fifo if object ids cannot fit.
// In the temporary object index memory, SPIFFS_OBJ_ID_IX_FLAG bit is used to indicate
// a reachable/unreachable object id.
memset(fs->work, 0, SPIFFS_CFG_LOG_PAGE_SZ(fs));
u32_t obj_id_log_ix = 0;
CHECK_CB(fs, SPIFFS_CHECK_INDEX, SPIFFS_CHECK_PROGRESS, 0, 0);
res = spiffs_obj_lu_find_entry_visitor(fs, 0, 0, 0, 0, spiffs_object_index_consistency_check_v, 0, &obj_id_log_ix,
0, 0);
if (res == SPIFFS_VIS_END) {
res = SPIFFS_OK;
}