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badblocks: fix overlapping check for clearing 

Current bad block clear implementation assumes the range to clear
overlaps with at least one bad block already stored. If given range to
clear precedes first bad block in a list, the first entry is incorrectly
updated.

Check not only if stored block end is past clear block end but also if
stored block start is before clear block end.

Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com>
Acked-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tomasz Majchrzak 2016-10-12 12:23:08 +02:00 committed by Jens Axboe
parent 24532f7681
commit 1fa9ce8d0e
1 changed files with 4 additions and 2 deletions
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6
block/badblocks.c
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@ -354,7 +354,8 @@ int badblocks_clear(struct badblocks *bb, sector_t s, int sectors)
* current range. Earlier ranges could also overlap,
* but only this one can overlap the end of the range.
*/
if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
if ((BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) &&
(BB_OFFSET(p[lo]) < target)) {
/* Partial overlap, leave the tail of this range */
int ack = BB_ACK(p[lo]);
sector_t a = BB_OFFSET(p[lo]);
@ -377,7 +378,8 @@ int badblocks_clear(struct badblocks *bb, sector_t s, int sectors)
lo--;
}
while (lo >= 0 &&
BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
(BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) &&
(BB_OFFSET(p[lo]) < target)) {
/* This range does overlap */
if (BB_OFFSET(p[lo]) < s) {
/* Keep the early parts of this range. */