NFS: move pnfs layouts to nfs_server structure
Weston Andros Adamson [Wed, 1 Jun 2011 20:44:44 +0000 (16:44 -0400)]
Layouts should be tracked per nfs_server (aka superblock)
instead of per struct nfs_client, which may have multiple FSIDs associated
with it.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/callback_proc.c
fs/nfs/client.c
fs/nfs/pnfs.c
include/linux/nfs_fs_sb.h

index d4d1954..74780f9 100644 (file)
@@ -111,6 +111,7 @@ int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nf
 static u32 initiate_file_draining(struct nfs_client *clp,
                                  struct cb_layoutrecallargs *args)
 {
+       struct nfs_server *server;
        struct pnfs_layout_hdr *lo;
        struct inode *ino;
        bool found = false;
@@ -118,21 +119,28 @@ static u32 initiate_file_draining(struct nfs_client *clp,
        LIST_HEAD(free_me_list);
 
        spin_lock(&clp->cl_lock);
-       list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
-               if (nfs_compare_fh(&args->cbl_fh,
-                                  &NFS_I(lo->plh_inode)->fh))
-                       continue;
-               ino = igrab(lo->plh_inode);
-               if (!ino)
-                       continue;
-               found = true;
-               /* Without this, layout can be freed as soon
-                * as we release cl_lock.
-                */
-               get_layout_hdr(lo);
-               break;
+       rcu_read_lock();
+       list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
+               list_for_each_entry(lo, &server->layouts, plh_layouts) {
+                       if (nfs_compare_fh(&args->cbl_fh,
+                                          &NFS_I(lo->plh_inode)->fh))
+                               continue;
+                       ino = igrab(lo->plh_inode);
+                       if (!ino)
+                               continue;
+                       found = true;
+                       /* Without this, layout can be freed as soon
+                        * as we release cl_lock.
+                        */
+                       get_layout_hdr(lo);
+                       break;
+               }
+               if (found)
+                       break;
        }
+       rcu_read_unlock();
        spin_unlock(&clp->cl_lock);
+
        if (!found)
                return NFS4ERR_NOMATCHING_LAYOUT;
 
@@ -154,6 +162,7 @@ static u32 initiate_file_draining(struct nfs_client *clp,
 static u32 initiate_bulk_draining(struct nfs_client *clp,
                                  struct cb_layoutrecallargs *args)
 {
+       struct nfs_server *server;
        struct pnfs_layout_hdr *lo;
        struct inode *ino;
        u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
@@ -167,18 +176,24 @@ static u32 initiate_bulk_draining(struct nfs_client *clp,
        };
 
        spin_lock(&clp->cl_lock);
-       list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
+       rcu_read_lock();
+       list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
                if ((args->cbl_recall_type == RETURN_FSID) &&
-                   memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
-                          &args->cbl_fsid, sizeof(struct nfs_fsid)))
-                       continue;
-               if (!igrab(lo->plh_inode))
+                   memcmp(&server->fsid, &args->cbl_fsid,
+                          sizeof(struct nfs_fsid)))
                        continue;
-               get_layout_hdr(lo);
-               BUG_ON(!list_empty(&lo->plh_bulk_recall));
-               list_add(&lo->plh_bulk_recall, &recall_list);
+
+               list_for_each_entry(lo, &server->layouts, plh_layouts) {
+                       if (!igrab(lo->plh_inode))
+                               continue;
+                       get_layout_hdr(lo);
+                       BUG_ON(!list_empty(&lo->plh_bulk_recall));
+                       list_add(&lo->plh_bulk_recall, &recall_list);
+               }
        }
+       rcu_read_unlock();
        spin_unlock(&clp->cl_lock);
+
        list_for_each_entry_safe(lo, tmp,
                                 &recall_list, plh_bulk_recall) {
                ino = lo->plh_inode;
index 006f8ff..5452ada 100644 (file)
@@ -188,9 +188,6 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
        cred = rpc_lookup_machine_cred();
        if (!IS_ERR(cred))
                clp->cl_machine_cred = cred;
-#if defined(CONFIG_NFS_V4_1)
-       INIT_LIST_HEAD(&clp->cl_layouts);
-#endif
        nfs_fscache_get_client_cookie(clp);
 
        return clp;
@@ -1063,6 +1060,7 @@ static struct nfs_server *nfs_alloc_server(void)
        INIT_LIST_HEAD(&server->client_link);
        INIT_LIST_HEAD(&server->master_link);
        INIT_LIST_HEAD(&server->delegations);
+       INIT_LIST_HEAD(&server->layouts);
 
        atomic_set(&server->active, 0);
 
index 29c0ca7..ff82007 100644 (file)
@@ -448,11 +448,17 @@ pnfs_destroy_layout(struct nfs_inode *nfsi)
 void
 pnfs_destroy_all_layouts(struct nfs_client *clp)
 {
+       struct nfs_server *server;
        struct pnfs_layout_hdr *lo;
        LIST_HEAD(tmp_list);
 
        spin_lock(&clp->cl_lock);
-       list_splice_init(&clp->cl_layouts, &tmp_list);
+       rcu_read_lock();
+       list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
+               if (!list_empty(&server->layouts))
+                       list_splice_init(&server->layouts, &tmp_list);
+       }
+       rcu_read_unlock();
        spin_unlock(&clp->cl_lock);
 
        while (!list_empty(&tmp_list)) {
@@ -920,7 +926,8 @@ pnfs_update_layout(struct inode *ino,
        };
        unsigned pg_offset;
        struct nfs_inode *nfsi = NFS_I(ino);
-       struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
+       struct nfs_server *server = NFS_SERVER(ino);
+       struct nfs_client *clp = server->nfs_client;
        struct pnfs_layout_hdr *lo;
        struct pnfs_layout_segment *lseg = NULL;
        bool first = false;
@@ -964,7 +971,7 @@ pnfs_update_layout(struct inode *ino,
                 */
                spin_lock(&clp->cl_lock);
                BUG_ON(!list_empty(&lo->plh_layouts));
-               list_add_tail(&lo->plh_layouts, &clp->cl_layouts);
+               list_add_tail(&lo->plh_layouts, &server->layouts);
                spin_unlock(&clp->cl_lock);
        }
 
index f23b188..4faeac8 100644 (file)
@@ -78,7 +78,6 @@ struct nfs_client {
        /* The flags used for obtaining the clientid during EXCHANGE_ID */
        u32                     cl_exchange_flags;
        struct nfs4_session     *cl_session;    /* sharred session */
-       struct list_head        cl_layouts;
 #endif /* CONFIG_NFS_V4 */
 
 #ifdef CONFIG_NFS_FSCACHE
@@ -152,6 +151,7 @@ struct nfs_server {
        struct rb_root          openowner_id;
        struct rb_root          lockowner_id;
 #endif
+       struct list_head        layouts;
        struct list_head        delegations;
        void (*destroy)(struct nfs_server *);