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Improve reliability of FS detection. (#1528) 

* Version to make filesystem detection more reliable
* Improve bad fs detection
This commit is contained in:
Philip Gladstone 2016-10-25 16:51:59 -04:00 committed by Marcel Stör
parent 6e38cc4bf9
commit 0ee1ab68b0
2 changed files with 47 additions and 14 deletions
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57
app/spiffs/spiffs_nucleus.c
View File

@ -292,27 +292,60 @@ s32_t spiffs_probe(
SPIFFS_CHECK_RES(res);
}
// check that we have sane number of blocks
if (bix_count[0] < 3) return SPIFFS_ERR_PROBE_TOO_FEW_BLOCKS;
// check that the order is correct, take aborted erases in calculation
// Note that bix_count[0] should be blockcnt, [1] should be blockcnt - 1
// and [2] should be blockcnt - 3
// first block aborted erase
if (magic[0] == (spiffs_obj_id)(-1) && bix_count[1] - bix_count[2] == 1) {
return (bix_count[1]+1) * cfg->log_block_size;
}
int fs_size;
if (magic[0] == (spiffs_obj_id)(-1) && bix_count[1] - bix_count[2] == 2) {
fs_size = bix_count[1]+1;
} else
// second block aborted erase
if (magic[1] == (spiffs_obj_id)(-1) && bix_count[0] - bix_count[2] == 2) {
return bix_count[0] * cfg->log_block_size;
}
if (magic[1] == (spiffs_obj_id)(-1) && bix_count[0] - bix_count[2] == 3) {
fs_size = bix_count[0];
} else
// third block aborted erase
if (magic[2] == (spiffs_obj_id)(-1) && bix_count[0] - bix_count[1] == 1) {
return bix_count[0] * cfg->log_block_size;
}
fs_size = bix_count[0];
} else
// no block has aborted erase
if (bix_count[0] - bix_count[1] == 1 && bix_count[1] - bix_count[2] == 1) {
return bix_count[0] * cfg->log_block_size;
if (bix_count[0] - bix_count[1] == 1 && bix_count[1] - bix_count[2] == 2) {
fs_size = bix_count[0];
} else {
return SPIFFS_ERR_PROBE_NOT_A_FS;
}
// check that we have sane number of blocks
if (fs_size < 3) return SPIFFS_ERR_PROBE_TOO_FEW_BLOCKS;
dummy_fs.block_count = fs_size;
// Now verify that there is at least one good block at the end
for (bix = fs_size - 1; bix >= 3; bix--) {
spiffs_obj_id end_magic;
paddr = SPIFFS_MAGIC_PADDR(&dummy_fs, bix);
#if SPIFFS_HAL_CALLBACK_EXTRA
// not any proper fs to report here, so callback with null
// (cross fingers that no-one gets angry)
res = cfg->hal_read_f((void *)0, paddr, sizeof(spiffs_obj_id), (u8_t *)&end_magic);
#else
res = cfg->hal_read_f(paddr, sizeof(spiffs_obj_id), (u8_t *)&end_magic);
#endif
if (res < 0) {
return SPIFFS_ERR_PROBE_NOT_A_FS;
}
if (end_magic == (spiffs_obj_id)(-1)) {
if (bix < fs_size - 1) {
return SPIFFS_ERR_PROBE_NOT_A_FS;
}
} else if (end_magic != SPIFFS_MAGIC(&dummy_fs, bix)) {
return SPIFFS_ERR_PROBE_NOT_A_FS;
} else {
break;
}
}
return fs_size * cfg->log_block_size;
}
#endif // SPIFFS_USE_MAGIC && SPIFFS_USE_MAGIC_LENGTH && SPIFFS_SINGLETON==0

2
app/spiffs/spiffs_nucleus.h
View File

@ -137,7 +137,7 @@
((spiffs_obj_id)(0x20140529 ^ SPIFFS_CFG_LOG_PAGE_SZ(fs)))
#else // SPIFFS_USE_MAGIC_LENGTH
#define SPIFFS_MAGIC(fs, bix) \
((spiffs_obj_id)(0x20140529 ^ SPIFFS_CFG_LOG_PAGE_SZ(fs) ^ ((fs)->block_count - (bix))))
((spiffs_obj_id)(0x20140529 ^ SPIFFS_CFG_LOG_PAGE_SZ(fs) ^ ((fs)->block_count - ((bix) < 3 ? (1<<(bix)) - 1 : (bix)<<2))))
#endif // SPIFFS_USE_MAGIC_LENGTH
#endif // SPIFFS_USE_MAGIC