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authorArtur Paszkiewicz <artur.paszkiewicz@intel.com>2017-03-09 10:00:03 +0100
committerShaohua Li <shli@fb.com>2017-03-16 16:55:56 -0700
commitba903a3ea465bd2f2bb9316054b295e79a7a518e (patch)
tree9eae9199e526deaa23791d7477bffcd910dbe463 /drivers/md/raid5-ppl.c
parent6358c239d88c751a9f14152a8d4ad2b69f5be48f (diff)
downloadlinux-ba903a3ea465bd2f2bb9316054b295e79a7a518e.tar.bz2
raid5-ppl: runtime PPL enabling or disabling
Allow writing to 'consistency_policy' attribute when the array is active. Add a new function 'change_consistency_policy' to the md_personality operations structure to handle the change in the personality code. Values "ppl" and "resync" are accepted and turn PPL on and off respectively. When enabling PPL its location and size should first be set using 'ppl_sector' and 'ppl_size' attributes and a valid PPL header should be written at this location on each member device. Enabling or disabling PPL is performed under a suspended array. The raid5_reset_stripe_cache function frees the stripe cache and allocates it again in order to allocate or free the ppl_pages for the stripes in the stripe cache. Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/raid5-ppl.c')
-rw-r--r--drivers/md/raid5-ppl.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/raid5-ppl.c b/drivers/md/raid5-ppl.c
index 4af420f4d8c0..27bad3e2d7ce 100644
--- a/drivers/md/raid5-ppl.c
+++ b/drivers/md/raid5-ppl.c
@@ -1187,6 +1187,10 @@ int ppl_init_log(struct r5conf *conf)
*/
mddev->recovery_cp = MaxSector;
set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
+ } else if (mddev->pers && ppl_conf->mismatch_count > 0) {
+ /* no mismatch allowed when enabling PPL for a running array */
+ ret = -EINVAL;
+ goto err;
}
conf->log_private = ppl_conf;