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md: raid1/raid10: handle allocation errors during array setup. 

Both raid1 and raid10 create a mempool during startup.
If the 'alloc' function for this mempool fails, unplug_slaves
is called.
If that happens when the pool is being initialised, unplug_slaves
will try to use the 'conf' structure that isn't filled in yet, and
badness will happen.

So ensure that unplug_slaves doesn't get called unless we know
that the conf structure if fully initialised.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-10-16 15:55:44 +11:00
parent f5efd45ae5
commit ed9bfdf1a4
2 changed files with 5 additions and 4 deletions
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5
drivers/md/raid1.c
View File

@ -64,7 +64,7 @@ static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data)
/* allocate a r1bio with room for raid_disks entries in the bios array */
r1_bio = kzalloc(size, gfp_flags);
if (!r1_bio)
if (!r1_bio && pi->mddev)
unplug_slaves(pi->mddev);
return r1_bio;
@ -1979,13 +1979,14 @@ static int run(mddev_t *mddev)
conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL);
if (!conf->poolinfo)
goto out_no_mem;
conf->poolinfo->mddev = mddev;
conf->poolinfo->mddev = NULL;
conf->poolinfo->raid_disks = mddev->raid_disks;
conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
r1bio_pool_free,
conf->poolinfo);
if (!conf->r1bio_pool)
goto out_no_mem;
conf->poolinfo->mddev = mddev;
spin_lock_init(&conf->device_lock);
mddev->queue->queue_lock = &conf->device_lock;

4
drivers/md/raid10.c
View File

@ -68,7 +68,7 @@ static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
/* allocate a r10bio with room for raid_disks entries in the bios array */
r10_bio = kzalloc(size, gfp_flags);
if (!r10_bio)
if (!r10_bio && conf->mddev)
unplug_slaves(conf->mddev);
return r10_bio;
@ -2096,7 +2096,6 @@ static int run(mddev_t *mddev)
if (!conf->tmppage)
goto out_free_conf;
conf->mddev = mddev;
conf->raid_disks = mddev->raid_disks;
conf->near_copies = nc;
conf->far_copies = fc;
@ -2133,6 +2132,7 @@ static int run(mddev_t *mddev)
goto out_free_conf;
}
conf->mddev = mddev;
spin_lock_init(&conf->device_lock);
mddev->queue->queue_lock = &conf->device_lock;