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NFS: Convert struct nfs_page to use krefs 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
hifive-unleashed-5.1
Trond Myklebust 2007-06-17 13:26:38 -04:00
parent a50f7951a3
commit c03b402461
3 changed files with 16 additions and 14 deletions
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14
fs/nfs/pagelist.c
View File

@ -85,9 +85,8 @@ nfs_create_request(struct nfs_open_context *ctx, struct inode *inode,
req->wb_offset = offset;
req->wb_pgbase = offset;
req->wb_bytes = count;
atomic_set(&req->wb_count, 1);
req->wb_context = get_nfs_open_context(ctx);
kref_init(&req->wb_kref);
return req;
}
@ -160,11 +159,9 @@ void nfs_clear_request(struct nfs_page *req)
*
* Note: Should never be called with the spinlock held!
*/
void
nfs_release_request(struct nfs_page *req)
static void nfs_free_request(struct kref *kref)
{
if (!atomic_dec_and_test(&req->wb_count))
return;
struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref);
/* Release struct file or cached credential */
nfs_clear_request(req);
@ -172,6 +169,11 @@ nfs_release_request(struct nfs_page *req)
nfs_page_free(req);
}
void nfs_release_request(struct nfs_page *req)
{
kref_put(&req->wb_kref, nfs_free_request);
}
static int nfs_wait_bit_interruptible(void *word)
{
int ret = 0;

6
fs/nfs/write.c
View File

@ -117,7 +117,7 @@ static struct nfs_page *nfs_page_find_request_locked(struct page *page)
if (PagePrivate(page)) {
req = (struct nfs_page *)page_private(page);
if (req != NULL)
atomic_inc(&req->wb_count);
kref_get(&req->wb_kref);
}
return req;
}
@ -398,7 +398,7 @@ static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
if (PageDirty(req->wb_page))
set_bit(PG_NEED_FLUSH, &req->wb_flags);
nfsi->npages++;
atomic_inc(&req->wb_count);
kref_get(&req->wb_kref);
return 0;
}
@ -531,7 +531,7 @@ static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, u
next = req->wb_index + 1;
BUG_ON(!NFS_WBACK_BUSY(req));
atomic_inc(&req->wb_count);
kref_get(&req->wb_kref);
spin_unlock(&nfsi->req_lock);
error = nfs_wait_on_request(req);
nfs_release_request(req);

10
include/linux/nfs_page.h
View File

@ -16,7 +16,7 @@
#include <linux/sunrpc/auth.h>
#include <linux/nfs_xdr.h>
#include <asm/atomic.h>
#include <linux/kref.h>
/*
* Valid flags for the radix tree
@ -42,7 +42,7 @@ struct nfs_page {
unsigned int wb_offset, /* Offset & ~PAGE_CACHE_MASK */
wb_pgbase, /* Start of page data */
wb_bytes; /* Length of request */
atomic_t wb_count; /* reference count */
struct kref wb_kref; /* reference count */
unsigned long wb_flags;
struct nfs_writeverf wb_verf; /* Commit cookie */
};
@ -89,7 +89,7 @@ extern void nfs_clear_page_writeback(struct nfs_page *req);
/*
* Lock the page of an asynchronous request without incrementing the wb_count
* Lock the page of an asynchronous request without getting a new reference
*/
static inline int
nfs_lock_request_dontget(struct nfs_page *req)
@ -98,14 +98,14 @@ nfs_lock_request_dontget(struct nfs_page *req)
}
/*
* Lock the page of an asynchronous request
* Lock the page of an asynchronous request and take a reference
*/
static inline int
nfs_lock_request(struct nfs_page *req)
{
if (test_and_set_bit(PG_BUSY, &req->wb_flags))
return 0;
atomic_inc(&req->wb_count);
kref_get(&req->wb_kref);
return 1;
}