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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>
This commit is contained in:
Trond Myklebust 2019-04-07 13:59:12 -04:00 committed by Anna Schumaker
parent 9fcd5960e8
commit c79d183ebb
2 changed files with 3 additions and 8 deletions
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8
fs/nfs/pagelist.c
View File

@ -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;
}
}
/**

3
include/linux/nfs_page.h
View File

@ -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 */