NFS: Remove redundant open context from nfs_page

The lock context already references and tracks the open context, so
take the opportunity to save some space in struct nfs_page.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index ce6440b..6ec3001 100644 (file)
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -325,7 +325,6 @@ __nfs_create_request(struct nfs_lock_context *l_ctx, struct page *page,
        req->wb_offset  = offset;
        req->wb_pgbase  = pgbase;
        req->wb_bytes   = count;
-       req->wb_context = get_nfs_open_context(ctx);
        kref_init(&req->wb_kref);
        req->wb_nio = 0;
        return req;
@@ -414,8 +413,8 @@ void nfs_unlock_and_release_request(struct nfs_page *req)
 static void nfs_clear_request(struct nfs_page *req)
 {
        struct page *page = req->wb_page;
-       struct nfs_open_context *ctx = req->wb_context;
        struct nfs_lock_context *l_ctx = req->wb_lock_context;
+       struct nfs_open_context *ctx;
 
        if (page != NULL) {
                put_page(page);
@@ -424,16 +423,13 @@ static void nfs_clear_request(struct nfs_page *req)
        if (l_ctx != NULL) {
                if (atomic_dec_and_test(&l_ctx->io_count)) {
                        wake_up_var(&l_ctx->io_count);
+                       ctx = l_ctx->open_context;
                        if (test_bit(NFS_CONTEXT_UNLOCK, &ctx->flags))
                                rpc_wake_up(&NFS_SERVER(d_inode(ctx->dentry))->uoc_rpcwaitq);
                }
                nfs_put_lock_context(l_ctx);
                req->wb_lock_context = NULL;
        }
-       if (ctx != NULL) {
-               put_nfs_open_context(ctx);
-               req->wb_context = NULL;
-       }
 }
 
 /**

diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 1ea13e9..0bbd587 100644 (file)
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -42,7 +42,6 @@ struct nfs_inode;
 struct nfs_page {
        struct list_head        wb_list;        /* Defines state of page: */
        struct page             *wb_page;       /* page to read in/write out */
-       struct nfs_open_context *wb_context;    /* File state context info */
        struct nfs_lock_context *wb_lock_context;       /* lock context info */
        pgoff_t                 wb_index;       /* Offset >> PAGE_SHIFT */
        unsigned int            wb_offset,      /* Offset & ~PAGE_MASK */
@@ -203,7 +202,7 @@ loff_t req_offset(struct nfs_page *req)
 static inline struct nfs_open_context *
 nfs_req_openctx(struct nfs_page *req)
 {
-       return req->wb_context;
+       return req->wb_lock_context->open_context;
 }
 
 #endif /* _LINUX_NFS_PAGE_H */