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[PATCH] md: yet another attempt to get bitmap-based resync to do the right thing in all cases...

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Firstly, R1BIO_Degraded was being set in a number of places in the resync
code, but is never used there, so get rid of those settings.

Then: When doing a resync, we want to clear the bit in the bitmap iff the
array will be non-degraded when the sync has completed.  However the current
code would clear the bitmap if the array was non-degraded when the resync
*started*, which obviously isn't right (it is for 'resync' but not for
'recovery' - i.e.  rebuilding a failed drive).

This patch calculated 'still_degraded' and uses the to tell bitmap_start_sync
whether this sync should clear the corresponding bit.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-08-04 12:53:34 -07:00 committed by Linus Torvalds
parent 193f1c9315
commit e3b9703e27
1 changed files with 15 additions and 14 deletions
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29
drivers/md/raid1.c
View file

@ -893,7 +893,6 @@ static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
if (!uptodate) {
md_error(r1_bio->mddev,
conf->mirrors[r1_bio->read_disk].rdev);
set_bit(R1BIO_Degraded, &r1_bio->state);
} else
set_bit(R1BIO_Uptodate, &r1_bio->state);
rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev);
@ -918,10 +917,9 @@ static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error)
mirror = i;
break;
}
if (!uptodate) {
if (!uptodate)
md_error(mddev, conf->mirrors[mirror].rdev);
set_bit(R1BIO_Degraded, &r1_bio->state);
}
update_head_pos(mirror, r1_bio);
if (atomic_dec_and_test(&r1_bio->remaining)) {
@ -1109,6 +1107,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
int i;
int write_targets = 0;
int sync_blocks;
int still_degraded = 0;
if (!conf->r1buf_pool)
{
@ -1137,7 +1136,10 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
return 0;
}
if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, mddev->degraded) &&
/* before building a request, check if we can skip these blocks..
* This call the bitmap_start_sync doesn't actually record anything
*/
if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) &&
!conf->fullsync) {
/* We can skip this block, and probably several more */
*skipped = 1;
@ -1203,24 +1205,23 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
if (i == disk) {
bio->bi_rw = READ;
bio->bi_end_io = end_sync_read;
} else if (conf->mirrors[i].rdev &&
!conf->mirrors[i].rdev->faulty &&
(!conf->mirrors[i].rdev->in_sync ||
sector_nr + RESYNC_SECTORS > mddev->recovery_cp)) {
} else if (conf->mirrors[i].rdev == NULL ||
conf->mirrors[i].rdev->faulty) {
still_degraded = 1;
continue;
} else if (!conf->mirrors[i].rdev->in_sync ||
sector_nr + RESYNC_SECTORS > mddev->recovery_cp) {
bio->bi_rw = WRITE;
bio->bi_end_io = end_sync_write;
write_targets ++;
} else
/* no need to read or write here */
continue;
bio->bi_sector = sector_nr + conf->mirrors[i].rdev->data_offset;
bio->bi_bdev = conf->mirrors[i].rdev->bdev;
bio->bi_private = r1_bio;
}
if (write_targets + 1 < conf->raid_disks)
/* array degraded, can't clear bitmap */
set_bit(R1BIO_Degraded, &r1_bio->state);
if (write_targets == 0) {
/* There is nowhere to write, so all non-sync
* drives must be failed - so we are finished
@ -1243,7 +1244,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
break;
if (sync_blocks == 0) {
if (!bitmap_start_sync(mddev->bitmap, sector_nr,
&sync_blocks, mddev->degraded) &&
&sync_blocks, still_degraded) &&
!conf->fullsync)
break;
if (sync_blocks < (PAGE_SIZE>>9))