NFS: Cleanup of NFS read code
Same callback hierarchy inversion as for the NFS write calls. This patch is
not strictly speaking needed by the O_DIRECT code, but avoids confusing
differences between the asynchronous read and write code.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index ae3ddd2..2da255f 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -36,8 +36,8 @@
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
static int nfs_pagein_one(struct list_head *, struct inode *);
-static void nfs_readpage_result_partial(struct nfs_read_data *, int);
-static void nfs_readpage_result_full(struct nfs_read_data *, int);
+static const struct rpc_call_ops nfs_read_partial_ops;
+static const struct rpc_call_ops nfs_read_full_ops;
static kmem_cache_t *nfs_rdata_cachep;
mempool_t *nfs_rdata_mempool;
@@ -200,9 +200,11 @@
* Set up the NFS read request struct
*/
static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
+ const struct rpc_call_ops *call_ops,
unsigned int count, unsigned int offset)
{
struct inode *inode;
+ int flags;
data->req = req;
data->inode = inode = req->wb_context->dentry->d_inode;
@@ -220,6 +222,9 @@
data->res.eof = 0;
nfs_fattr_init(&data->fattr);
+ /* Set up the initial task struct. */
+ flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
+ rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data);
NFS_PROTO(inode)->read_setup(data);
data->task.tk_cookie = (unsigned long)inode;
@@ -307,14 +312,15 @@
list_del_init(&data->pages);
data->pagevec[0] = page;
- data->complete = nfs_readpage_result_partial;
if (nbytes > rsize) {
- nfs_read_rpcsetup(req, data, rsize, offset);
+ nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
+ rsize, offset);
offset += rsize;
nbytes -= rsize;
} else {
- nfs_read_rpcsetup(req, data, nbytes, offset);
+ nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
+ nbytes, offset);
nbytes = 0;
}
nfs_execute_read(data);
@@ -360,8 +366,7 @@
}
req = nfs_list_entry(data->pages.next);
- data->complete = nfs_readpage_result_full;
- nfs_read_rpcsetup(req, data, count, 0);
+ nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0);
nfs_execute_read(data);
return 0;
@@ -395,12 +400,15 @@
/*
* Handle a read reply that fills part of a page.
*/
-static void nfs_readpage_result_partial(struct nfs_read_data *data, int status)
+static void nfs_readpage_result_partial(struct rpc_task *task, void *calldata)
{
+ struct nfs_read_data *data = calldata;
struct nfs_page *req = data->req;
struct page *page = req->wb_page;
- if (status >= 0) {
+ if (nfs_readpage_result(task, data) != 0)
+ return;
+ if (task->tk_status >= 0) {
unsigned int request = data->args.count;
unsigned int result = data->res.count;
@@ -419,20 +427,28 @@
}
}
+static const struct rpc_call_ops nfs_read_partial_ops = {
+ .rpc_call_done = nfs_readpage_result_partial,
+ .rpc_release = nfs_readdata_release,
+};
+
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
*/
-static void nfs_readpage_result_full(struct nfs_read_data *data, int status)
+static void nfs_readpage_result_full(struct rpc_task *task, void *calldata)
{
+ struct nfs_read_data *data = calldata;
unsigned int count = data->res.count;
+ if (nfs_readpage_result(task, data) != 0)
+ return;
while (!list_empty(&data->pages)) {
struct nfs_page *req = nfs_list_entry(data->pages.next);
struct page *page = req->wb_page;
nfs_list_remove_request(req);
- if (status >= 0) {
+ if (task->tk_status >= 0) {
if (count < PAGE_CACHE_SIZE) {
if (count < req->wb_bytes)
memclear_highpage_flush(page,
@@ -448,19 +464,27 @@
}
}
+static const struct rpc_call_ops nfs_read_full_ops = {
+ .rpc_call_done = nfs_readpage_result_full,
+ .rpc_release = nfs_readdata_release,
+};
+
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
*/
-void nfs_readpage_result(struct rpc_task *task, void *calldata)
+int nfs_readpage_result(struct rpc_task *task, struct nfs_read_data *data)
{
- struct nfs_read_data *data = calldata;
struct nfs_readargs *argp = &data->args;
struct nfs_readres *resp = &data->res;
- int status = task->tk_status;
+ int status;
dprintk("NFS: %4d nfs_readpage_result, (status %d)\n",
- task->tk_pid, status);
+ task->tk_pid, task->tk_status);
+
+ status = NFS_PROTO(data->inode)->read_done(task, data);
+ if (status != 0)
+ return status;
nfs_add_stats(data->inode, NFSIOS_SERVERREADBYTES, resp->count);
@@ -474,14 +498,14 @@
argp->pgbase += resp->count;
argp->count -= resp->count;
rpc_restart_call(task);
- return;
+ return -EAGAIN;
}
task->tk_status = -EIO;
}
spin_lock(&data->inode->i_lock);
NFS_I(data->inode)->cache_validity |= NFS_INO_INVALID_ATIME;
spin_unlock(&data->inode->i_lock);
- data->complete(data, status);
+ return 0;
}
/*
