Merge tag 'dm-3.19-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull device mapper fixes from Mike Snitzer:
"One stable fix for a dm-cache 3.19-rc6 regression and one stable fix
for dm-thin:
- fix DM cache metadata open/lookup error paths to properly use
ERR_PTR and IS_ERR (fixes: 3.19-rc6 "stable" commit 9b1cc9f251)
- fix DM thin-provisioning to disallow userspace from sending
messages to the thin-pool if the pool is in READ_ONLY or FAIL mode
since no metadata changes are allowed in these modes"
* tag 'dm-3.19-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
dm thin: don't allow messages to be sent to a pool target in READ_ONLY or FAIL mode
dm cache: fix missing ERR_PTR returns and handling
diff --git a/drivers/md/dm-cache-metadata.c b/drivers/md/dm-cache-metadata.c
index 21b1562..c1c0104 100644
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -683,7 +683,7 @@
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd) {
DMERR("could not allocate metadata struct");
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
atomic_set(&cmd->ref_count, 1);
@@ -745,7 +745,7 @@
return cmd;
cmd = metadata_open(bdev, data_block_size, may_format_device, policy_hint_size);
- if (cmd) {
+ if (!IS_ERR(cmd)) {
mutex_lock(&table_lock);
cmd2 = lookup(bdev);
if (cmd2) {
@@ -780,9 +780,10 @@
{
struct dm_cache_metadata *cmd = lookup_or_open(bdev, data_block_size,
may_format_device, policy_hint_size);
- if (cmd && !same_params(cmd, data_block_size)) {
+
+ if (!IS_ERR(cmd) && !same_params(cmd, data_block_size)) {
dm_cache_metadata_close(cmd);
- return NULL;
+ return ERR_PTR(-EINVAL);
}
return cmd;
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 4934789..07705ee 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3385,6 +3385,12 @@
struct pool_c *pt = ti->private;
struct pool *pool = pt->pool;
+ if (get_pool_mode(pool) >= PM_READ_ONLY) {
+ DMERR("%s: unable to service pool target messages in READ_ONLY or FAIL mode",
+ dm_device_name(pool->pool_md));
+ return -EINVAL;
+ }
+
if (!strcasecmp(argv[0], "create_thin"))
r = process_create_thin_mesg(argc, argv, pool);