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authorDan Streetman <ddstreet@ieee.org>2015-09-09 15:35:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-10 13:29:01 -0700
commit3f0e131221eb951c45c93d1cce9db73889be2a5e (patch)
treeaa492f7062a9d73643e424b352598363c41acdf2 /include/linux/zpool.h
parent26d2177e977c912863ac04f6c1a967e793ca3a56 (diff)
zpool: add zpool_has_pool()
This series makes creation of the zpool and compressor dynamic, so that they can be changed at runtime. This makes using/configuring zswap easier, as before this zswap had to be configured at boot time, using boot params. This uses a single list to track both the zpool and compressor together, although Seth had mentioned an alternative which is to track the zpools and compressors using separate lists. In the most common case, only a single zpool and single compressor, using one list is slightly simpler than using two lists, and for the uncommon case of multiple zpools and/or compressors, using one list is slightly less simple (and uses slightly more memory, probably) than using two lists. This patch (of 4): Add zpool_has_pool() function, indicating if the specified type of zpool is available (i.e. zsmalloc or zbud). This allows checking if a pool is available, without actually trying to allocate it, similar to crypto_has_alg(). This is used by a following patch to zswap that enables the dynamic runtime creation of zswap zpools. Signed-off-by: Dan Streetman <ddstreet@ieee.org> Acked-by: Seth Jennings <sjennings@variantweb.net> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/zpool.h')
-rw-r--r--include/linux/zpool.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/zpool.h b/include/linux/zpool.h
index c924a28d9805..42f8ec992452 100644
--- a/include/linux/zpool.h
+++ b/include/linux/zpool.h
@@ -36,6 +36,8 @@ enum zpool_mapmode {
ZPOOL_MM_DEFAULT = ZPOOL_MM_RW
};
+bool zpool_has_pool(char *type);
+
struct zpool *zpool_create_pool(char *type, char *name,
gfp_t gfp, const struct zpool_ops *ops);