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修复无限重格式化真根因：探针名.fschk在FF_USE_LFN=0下恒返FR_INVALID_NAME且误入重格式化集合

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Wanderingss
2026-09-20 13:03:47 +08:00
parent 32283de45b
commit 6084af8fe6
1 changed files with 13 additions and 6 deletions
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Src/freertos.c
+13 -6
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@@ -245,21 +245,26 @@ void StartDefaultTask(void *argument)
} }
} }
if (fr == FR_OK) { if (fr == FR_OK) {
/* 探针：/.fschk（8.3 合规）小写一次，验证 FAT 链真实可用。本移植 /* 探针：/fschk.tmp 小写一次，验证 FAT 链真实可用。本移植
* f_write 簇分配失败返回 FR_OK+短写 → 必须校验写回字节数；短写按 * f_write 簇分配失败返回 FR_OK+短写 → 必须校验写回字节数；短写按
* FR_DENIED 归一化（落入下方结构性集合触发重格式化） */ * FR_DENIED 归一化（落入下方结构性集合触发重格式化）。
* ⚠ 事故教训（2026-09-20 台架实证，"无限重格式化"真根因）：本移植
* FF_USE_LFN=0，ff.c create_short 把 ".fschk" 点后的 FSCHK 当扩展域
* 解析（5 字符 > 3 上限）→ f_open 恒返 FR_INVALID_NAME(6)（纯 RAM
* 判定、不碰盘）→ 曾误入下方结构性错误集合 → 每 boot 假失败 →
* 无限重格式化。探针名必须严格 8.3：名≤8、扩展≤3、不以点开头。 */
#define FS_VOL_PROBE(h) do { \ #define FS_VOL_PROBE(h) do { \
FIL __chk; \ FIL __chk; \
static const uint8_t __chkbuf[8] = { 0 }; \ static const uint8_t __chkbuf[8] = { 0 }; \
UINT __bw = 0u; \ UINT __bw = 0u; \
FRESULT __wr; \ FRESULT __wr; \
(h) = f_open(&__chk, "/.fschk", FA_WRITE | FA_OPEN_ALWAYS); \ (h) = f_open(&__chk, "/fschk.tmp", FA_WRITE | FA_OPEN_ALWAYS); \
if ((h) == FR_OK) { \ if ((h) == FR_OK) { \
__wr = f_write(&__chk, __chkbuf, (UINT)sizeof(__chkbuf), &__bw); \ __wr = f_write(&__chk, __chkbuf, (UINT)sizeof(__chkbuf), &__bw); \
(void)f_close(&__chk); \ (void)f_close(&__chk); \
if (__wr == FR_OK && __bw == (UINT)sizeof(__chkbuf)) { \ if (__wr == FR_OK && __bw == (UINT)sizeof(__chkbuf)) { \
(h) = FR_OK; \ (h) = FR_OK; \
(void)f_unlink("/.fschk"); \ (void)f_unlink("/fschk.tmp"); \
} else { \ } else { \
(h) = (__wr != FR_OK) ? __wr : FR_DENIED; \ (h) = (__wr != FR_OK) ? __wr : FR_DENIED; \
} \ } \
@@ -280,10 +285,12 @@ void StartDefaultTask(void *argument)
nand_ftl_dump_binding(16, "postreset"); nand_ftl_dump_binding(16, "postreset");
} }
if (hfr != FR_OK) { if (hfr != FR_OK) {
if (hfr == FR_DENIED || hfr == FR_INVALID_OBJECT || /* ⚠ FR_INVALID_NAME 绝不可入本集合：它是路径名语法错误（纯 RAM 判定、
* 不碰盘），与卷健康无关（曾误入 → "无限重格式化"事故） */
if (hfr == FR_DENIED || hfr == FR_INVALID_OBJECT ||
hfr == FR_INT_ERR || hfr == FR_DISK_ERR || hfr == FR_INT_ERR || hfr == FR_DISK_ERR ||
hfr == FR_NO_FILE || hfr == FR_NO_PATH || hfr == FR_NO_FILE || hfr == FR_NO_PATH ||
hfr == FR_INVALID_NAME || hfr == FR_NO_FILESYSTEM) { hfr == FR_NO_FILESYSTEM) {
DBG_INFO("[FS] volume FAT invalid (fr=%d), reformatting...", DBG_INFO("[FS] volume FAT invalid (fr=%d), reformatting...",
(int)hfr); (int)hfr);
f_mount(NULL, "", 0); f_mount(NULL, "", 0);