diff options
| -rw-r--r-- | fs/ubifs/debug.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c index 1aaa9f519485..5dc993fdca87 100644 --- a/fs/ubifs/debug.c +++ b/fs/ubifs/debug.c @@ -2646,20 +2646,18 @@ static int power_cut_emulated(struct ubifs_info *c, int lnum, int write) return 1; } -static void cut_data(const void *buf, unsigned int len) +static int corrupt_data(const struct ubifs_info *c, const void *buf, + unsigned int len) { unsigned int from, to, i, ffs = chance(1, 2); unsigned char *p = (void *)buf; from = random32() % (len + 1); - if (chance(1, 2)) - to = random32() % (len - from + 1); - else - to = len; + /* Corruption may only span one max. write unit */ + to = min(len, ALIGN(from, c->max_write_size)); - if (from < to) - ubifs_warn("filled bytes %u-%u with %s", from, to - 1, - ffs ? "0xFFs" : "random data"); + ubifs_warn("filled bytes %u-%u with %s", from, to - 1, + ffs ? "0xFFs" : "random data"); if (ffs) for (i = from; i < to; i++) @@ -2667,6 +2665,8 @@ static void cut_data(const void *buf, unsigned int len) else for (i = from; i < to; i++) p[i] = random32() % 0x100; + + return to; } int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf, @@ -2679,7 +2679,9 @@ int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf, failing = power_cut_emulated(c, lnum, 1); if (failing) - cut_data(buf, len); + len = corrupt_data(c, buf, len); + ubifs_warn("actually write %d bytes to LEB %d:%d (the buffer was corrupted)", + len, lnum, offs); err = ubi_leb_write(c->ubi, lnum, buf, offs, len); if (err) return err; |