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ceph: unregister bdi before kill_anon_super releases device name 

Unregister and destroy the bdi in put_super, after mount is r/o, but before
put_anon_super releases the device name.

For symmetry, bdi_destroy in destroy_client (we bdi_init in create_client).

Only set s_bdi if bdi_register succeeds, since we use it to decide whether
to bdi_unregister.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-05-04 16:14:46 -07:00
parent b0930f8d38
commit 5dfc589a84
1 changed files with 16 additions and 7 deletions
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23
fs/ceph/super.c
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@ -47,10 +47,20 @@ const char *ceph_file_part(const char *s, int len)
*/
static void ceph_put_super(struct super_block *s)
{
struct ceph_client *cl = ceph_client(s);
struct ceph_client *client = ceph_sb_to_client(s);
dout("put_super\n");
ceph_mdsc_close_sessions(&cl->mdsc);
ceph_mdsc_close_sessions(&client->mdsc);
/*
* ensure we release the bdi before put_anon_super releases
* the device name.
*/
if (s->s_bdi == &client->backing_dev_info) {
bdi_unregister(&client->backing_dev_info);
s->s_bdi = NULL;
}
return;
}
@ -636,6 +646,8 @@ static void ceph_destroy_client(struct ceph_client *client)
destroy_workqueue(client->pg_inv_wq);
destroy_workqueue(client->trunc_wq);
bdi_destroy(&client->backing_dev_info);
if (client->msgr)
ceph_messenger_destroy(client->msgr);
mempool_destroy(client->wb_pagevec_pool);
@ -876,14 +888,14 @@ static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
{
int err;
sb->s_bdi = &client->backing_dev_info;
/* set ra_pages based on rsize mount option? */
if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
client->backing_dev_info.ra_pages =
(client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
>> PAGE_SHIFT;
err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
if (!err)
sb->s_bdi = &client->backing_dev_info;
return err;
}
@ -957,9 +969,6 @@ static void ceph_kill_sb(struct super_block *s)
dout("kill_sb %p\n", s);
ceph_mdsc_pre_umount(&client->mdsc);
kill_anon_super(s); /* will call put_super after sb is r/o */
if (s->s_bdi == &client->backing_dev_info)
bdi_unregister(&client->backing_dev_info);
bdi_destroy(&client->backing_dev_info);
ceph_destroy_client(client);
}