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UBIFS: correct data corruption range

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With power-cut emulation, it is possible that sometimes no data at all is
corrupted and that confusing messages are printed due to errors in the
computation of data corruption range.

[1] The start of the range should be [0..len-1], not [0..len].
[2] The end of the range should always be at least 1 greater than the start.

Signed-off-by: Mats Karrman <mats.karrman@tritech.se>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Mats Kärrman 2013-08-21 13:24:49 +00:00 committed by Artem Bityutskiy
parent 7203db97b7
commit 58a4e23703
1 changed files with 3 additions and 3 deletions
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6
fs/ubifs/debug.c
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@ -2563,9 +2563,9 @@ static int corrupt_data(const struct ubifs_info *c, const void *buf,
unsigned int from, to, ffs = chance(1, 2);
unsigned char *p = (void *)buf;
from = prandom_u32() % (len + 1);
/* Corruption may only span one max. write unit */
to = min(len, ALIGN(from, c->max_write_size));
from = prandom_u32() % len;
/* Corruption span max to end of write unit */
to = min(len, ALIGN(from + 1, c->max_write_size));
ubifs_warn("filled bytes %u-%u with %s", from, to - 1,
ffs ? "0xFFs" : "random data");