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| author | NeilBrown <neilb@suse.de> | 2006-03-27 01:18:14 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-27 08:45:02 -0800 |
| commit | e464eafdb4400c6d6576ba3840d8bd40340f8a96 (patch) | |
| tree | 0c3f4003c883264ee08300c02007f06e4d1ebb91 /drivers/md/raid5.c | |
| parent | 16484bf59634e25d1299761e5ed8bacf22bc6368 (diff) | |
| download | linux-3.10-e464eafdb4400c6d6576ba3840d8bd40340f8a96.tar.gz linux-3.10-e464eafdb4400c6d6576ba3840d8bd40340f8a96.tar.bz2 linux-3.10-e464eafdb4400c6d6576ba3840d8bd40340f8a96.zip | |
[PATCH] md: Support suspending of IO to regions of an md array
This allows user-space to access data safely. This is needed for raid5
reshape as user-space needs to take a backup of the first few stripes before
allowing reshape to commence.
It will also be useful in cluster-aware raid1 configurations so that all
cluster members can leave a section of the array untouched while a
resync/recovery happens.
A 'start' and 'end' of the suspended range are written to 2 sysfs attributes.
Note that only one range can be suspended at a time.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 355dafb98aa..bb16ac231a4 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -1805,6 +1805,15 @@ static int make_request(request_queue_t *q, struct bio * bi) goto retry; } } + /* FIXME what if we get a false positive because these + * are being updated. + */ + if (logical_sector >= mddev->suspend_lo && + logical_sector < mddev->suspend_hi) { + release_stripe(sh); + schedule(); + goto retry; + } if (test_bit(STRIPE_EXPANDING, &sh->state) || !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { @@ -2725,6 +2734,10 @@ static void raid5_quiesce(mddev_t *mddev, int state) raid5_conf_t *conf = mddev_to_conf(mddev); switch(state) { + case 2: /* resume for a suspend */ + wake_up(&conf->wait_for_overlap); + break; + case 1: /* stop all writes */ spin_lock_irq(&conf->device_lock); conf->quiesce = 1; @@ -2738,6 +2751,7 @@ static void raid5_quiesce(mddev_t *mddev, int state) spin_lock_irq(&conf->device_lock); conf->quiesce = 0; wake_up(&conf->wait_for_stripe); + wake_up(&conf->wait_for_overlap); spin_unlock_irq(&conf->device_lock); break; } |