Add mempools for the allocation of cifs_io_request and cifs_io_subrequest
structs for netfslib to use so that it can guarantee eventual allocation in
writeback.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Steve French <sfrench@xxxxxxxxx>
cc: Shyam Prasad N <nspmangalore@xxxxxxxxx>
cc: Rohith Surabattula <rohiths.msft@xxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: linux-cifs@xxxxxxxxxxxxxxx
cc: netfs@xxxxxxxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
cc: linux-mm@xxxxxxxxx
---
fs/smb/client/cifsfs.c | 55 +++++++++++++++++++++++++++++++++++++++-
fs/smb/client/cifsglob.h | 2 ++
2 files changed, 56 insertions(+), 1 deletion(-)
diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index 2dd29663dab1..d8c31383752a 100644
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -370,9 +370,13 @@ static struct kmem_cache *cifs_inode_cachep;
static struct kmem_cache *cifs_req_cachep;
static struct kmem_cache *cifs_mid_cachep;
static struct kmem_cache *cifs_sm_req_cachep;
+static struct kmem_cache *cifs_io_request_cachep;
+static struct kmem_cache *cifs_io_subrequest_cachep;
mempool_t *cifs_sm_req_poolp;
mempool_t *cifs_req_poolp;
mempool_t *cifs_mid_poolp;
+mempool_t cifs_io_request_pool;
+mempool_t cifs_io_subrequest_pool;
static struct inode *
cifs_alloc_inode(struct super_block *sb)
@@ -1746,6 +1750,48 @@ static void destroy_mids(void)
kmem_cache_destroy(cifs_mid_cachep);
}
+static int cifs_init_netfs(void)
+{
+ cifs_io_request_cachep =
+ kmem_cache_create("cifs_io_request",
+ sizeof(struct netfs_io_request), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!cifs_io_request_cachep)
+ goto nomem_req;
+
+ if (mempool_init_slab_pool(&cifs_io_request_pool, 100, cifs_io_request_cachep) < 0)
+ goto nomem_reqpool;
+
+ cifs_io_subrequest_cachep =
+ kmem_cache_create("cifs_io_subrequest",
+ sizeof(struct cifs_io_subrequest), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!cifs_io_subrequest_cachep)
+ goto nomem_subreq;
+
+ if (mempool_init_slab_pool(&cifs_io_subrequest_pool, 100, cifs_io_subrequest_cachep) < 0)
+ goto nomem_subreqpool;
+
+ return 0;
+
+nomem_subreqpool:
+ kmem_cache_destroy(cifs_io_subrequest_cachep);
+nomem_subreq:
+ mempool_destroy(&cifs_io_request_pool);
+nomem_reqpool:
+ kmem_cache_destroy(cifs_io_request_cachep);
+nomem_req:
+ return -ENOMEM;
+}
+
+static void cifs_destroy_netfs(void)
+{
+ mempool_destroy(&cifs_io_subrequest_pool);
+ kmem_cache_destroy(cifs_io_subrequest_cachep);
+ mempool_destroy(&cifs_io_request_pool);
+ kmem_cache_destroy(cifs_io_request_cachep);
+}
+
static int __init
init_cifs(void)
{
@@ -1843,10 +1889,14 @@ init_cifs(void)
if (rc)
goto out_destroy_deferredclose_wq;
- rc = init_mids();
+ rc = cifs_init_netfs();
if (rc)
goto out_destroy_inodecache;
+ rc = init_mids();
+ if (rc)
+ goto out_destroy_netfs;
+
rc = cifs_init_request_bufs();
if (rc)
goto out_destroy_mids;
@@ -1901,6 +1951,8 @@ init_cifs(void)
cifs_destroy_request_bufs();
out_destroy_mids:
destroy_mids();
+out_destroy_netfs:
+ cifs_destroy_netfs();
out_destroy_inodecache:
cifs_destroy_inodecache();
out_destroy_deferredclose_wq:
@@ -1937,6 +1989,7 @@ exit_cifs(void)
#endif
cifs_destroy_request_bufs();
destroy_mids();
+ cifs_destroy_netfs();
cifs_destroy_inodecache();
destroy_workqueue(deferredclose_wq);
destroy_workqueue(cifsoplockd_wq);
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 6436d360b9f4..057a7933b175 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -2089,6 +2089,8 @@ extern __u32 cifs_lock_secret;
extern mempool_t *cifs_sm_req_poolp;
extern mempool_t *cifs_req_poolp;
extern mempool_t *cifs_mid_poolp;
+extern mempool_t cifs_io_request_pool;
+extern mempool_t cifs_io_subrequest_pool;
/* Operations for different SMB versions */
#define SMB1_VERSION_STRING "1.0"
