[RFC,02/27] pnfs: direct i/o
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Message ID 1303320383-21027-1-git-send-email-bhalevy@panasas.com
State New, archived
Headers show

Commit Message

Benny Halevy April 20, 2011, 5:26 p.m. UTC
From: Andy Adamson <andros@netapp.com>

Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
---
 fs/nfs/direct.c |  160 +++++++++++++++++++++++++++++++-----------------------
 1 files changed, 92 insertions(+), 68 deletions(-)

Patch
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diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 8eea253..55dffb7 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -272,6 +272,38 @@  static const struct rpc_call_ops nfs_read_direct_ops = {
 	.rpc_release = nfs_direct_read_release,
 };
 
+static long nfs_direct_read_execute(struct nfs_read_data *data,
+				    struct rpc_task_setup *task_setup_data,
+				    struct rpc_message *msg)
+{
+	struct inode *inode = data->inode;
+	struct rpc_task *task;
+
+	nfs_fattr_init(&data->fattr);
+	msg->rpc_argp = &data->args;
+	msg->rpc_resp = &data->res;
+
+	task_setup_data->task = &data->task;
+	task_setup_data->callback_data = data;
+	NFS_PROTO(inode)->read_setup(data, msg);
+
+	task = rpc_run_task(task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+
+	rpc_put_task(task);
+
+	dprintk("NFS: %5u initiated direct read call "
+		"(req %s/%lld, %u bytes @ offset %llu)\n",
+		data->task.tk_pid,
+		inode->i_sb->s_id,
+		(long long)NFS_FILEID(inode),
+		data->args.count,
+		(unsigned long long)data->args.offset);
+
+	return 0;
+}
+
 /*
  * For each rsize'd chunk of the user's buffer, dispatch an NFS READ
  * operation.  If nfs_readdata_alloc() or get_user_pages() fails,
@@ -288,7 +320,6 @@  static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq,
 	unsigned long user_addr = (unsigned long)iov->iov_base;
 	size_t count = iov->iov_len;
 	size_t rsize = NFS_SERVER(inode)->rsize;
-	struct rpc_task *task;
 	struct rpc_message msg = {
 		.rpc_cred = ctx->cred,
 	};
@@ -349,26 +380,9 @@  static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq,
 		data->res.fattr = &data->fattr;
 		data->res.eof = 0;
 		data->res.count = bytes;
-		nfs_fattr_init(&data->fattr);
-		msg.rpc_argp = &data->args;
-		msg.rpc_resp = &data->res;
 
-		task_setup_data.task = &data->task;
-		task_setup_data.callback_data = data;
-		NFS_PROTO(inode)->read_setup(data, &msg);
-
-		task = rpc_run_task(&task_setup_data);
-		if (IS_ERR(task))
+		if (nfs_direct_read_execute(data, &task_setup_data, &msg))
 			break;
-		rpc_put_task(task);
-
-		dprintk("NFS: %5u initiated direct read call "
-			"(req %s/%Ld, %zu bytes @ offset %Lu)\n",
-				data->task.tk_pid,
-				inode->i_sb->s_id,
-				(long long)NFS_FILEID(inode),
-				bytes,
-				(unsigned long long)data->args.offset);
 
 		started += bytes;
 		user_addr += bytes;
@@ -461,12 +475,15 @@  static void nfs_direct_free_writedata(struct nfs_direct_req *dreq)
 }
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
+static long nfs_direct_write_execute(struct nfs_write_data *data,
+				     struct rpc_task_setup *task_setup_data,
+				     struct rpc_message *msg);
+
 static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
 {
 	struct inode *inode = dreq->inode;
 	struct list_head *p;
 	struct nfs_write_data *data;
-	struct rpc_task *task;
 	struct rpc_message msg = {
 		.rpc_cred = dreq->ctx->cred,
 	};
@@ -500,25 +517,7 @@  static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
 		 * Reuse data->task; data->args should not have changed
 		 * since the original request was sent.
 		 */
-		task_setup_data.task = &data->task;
-		task_setup_data.callback_data = data;
-		msg.rpc_argp = &data->args;
-		msg.rpc_resp = &data->res;
-		NFS_PROTO(inode)->write_setup(data, &msg);
-
-		/*
-		 * We're called via an RPC callback, so BKL is already held.
-		 */
-		task = rpc_run_task(&task_setup_data);
-		if (!IS_ERR(task))
-			rpc_put_task(task);
-
-		dprintk("NFS: %5u rescheduled direct write call (req %s/%Ld, %u bytes @ offset %Lu)\n",
-				data->task.tk_pid,
-				inode->i_sb->s_id,
-				(long long)NFS_FILEID(inode),
-				data->args.count,
-				(unsigned long long)data->args.offset);
+		nfs_direct_write_execute(data, &task_setup_data, &msg);
 	}
 
 	if (put_dreq(dreq))
@@ -561,10 +560,31 @@  static const struct rpc_call_ops nfs_commit_direct_ops = {
 	.rpc_release = nfs_direct_commit_release,
 };
 
+static long nfs_direct_commit_execute(struct nfs_direct_req *dreq,
+				      struct nfs_write_data *data,
+				      struct rpc_task_setup *task_setup_data,
+				      struct rpc_message *msg)
+{
+	struct rpc_task *task;
+
+	NFS_PROTO(data->inode)->commit_setup(data, msg);
+
+	/* Note: task.tk_ops->rpc_release will free dreq->commit_data */
+	dreq->commit_data = NULL;
+
+	dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
+
+	task = rpc_run_task(task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+
+	rpc_put_task(task);
+	return 0;
+}
+
 static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq)
 {
 	struct nfs_write_data *data = dreq->commit_data;
-	struct rpc_task *task;
 	struct rpc_message msg = {
 		.rpc_argp = &data->args,
 		.rpc_resp = &data->res,
@@ -593,16 +613,7 @@  static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq)
 	data->res.verf = &data->verf;
 	nfs_fattr_init(&data->fattr);
 
-	NFS_PROTO(data->inode)->commit_setup(data, &msg);
-
-	/* Note: task.tk_ops->rpc_release will free dreq->commit_data */
-	dreq->commit_data = NULL;
-
-	dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
-
-	task = rpc_run_task(&task_setup_data);
-	if (!IS_ERR(task))
-		rpc_put_task(task);
+	nfs_direct_commit_execute(dreq, data, &task_setup_data, &msg);
 }
 
 static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode *inode)
@@ -703,6 +714,36 @@  static const struct rpc_call_ops nfs_write_direct_ops = {
 	.rpc_release = nfs_direct_write_release,
 };
 
+static long nfs_direct_write_execute(struct nfs_write_data *data,
+				     struct rpc_task_setup *task_setup_data,
+				     struct rpc_message *msg)
+{
+	struct inode *inode = data->inode;
+	struct rpc_task *task;
+
+	task_setup_data->task = &data->task;
+	task_setup_data->callback_data = data;
+	msg->rpc_argp = &data->args;
+	msg->rpc_resp = &data->res;
+	NFS_PROTO(inode)->write_setup(data, msg);
+
+	task = rpc_run_task(task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+
+	rpc_put_task(task);
+
+	dprintk("NFS: %5u initiated direct write call "
+		"(req %s/%lld, %u bytes @ offset %llu)\n",
+		data->task.tk_pid,
+		inode->i_sb->s_id,
+		(long long)NFS_FILEID(inode),
+		data->args.count,
+		(unsigned long long)data->args.offset);
+
+	return 0;
+}
+
 /*
  * For each wsize'd chunk of the user's buffer, dispatch an NFS WRITE
  * operation.  If nfs_writedata_alloc() or get_user_pages() fails,
@@ -718,7 +759,6 @@  static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq,
 	struct inode *inode = ctx->path.dentry->d_inode;
 	unsigned long user_addr = (unsigned long)iov->iov_base;
 	size_t count = iov->iov_len;
-	struct rpc_task *task;
 	struct rpc_message msg = {
 		.rpc_cred = ctx->cred,
 	};
@@ -785,24 +825,8 @@  static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq,
 		data->res.verf = &data->verf;
 		nfs_fattr_init(&data->fattr);
 
-		task_setup_data.task = &data->task;
-		task_setup_data.callback_data = data;
-		msg.rpc_argp = &data->args;
-		msg.rpc_resp = &data->res;
-		NFS_PROTO(inode)->write_setup(data, &msg);
-
-		task = rpc_run_task(&task_setup_data);
-		if (IS_ERR(task))
+		if (nfs_direct_write_execute(data, &task_setup_data, &msg))
 			break;
-		rpc_put_task(task);
-
-		dprintk("NFS: %5u initiated direct write call "
-			"(req %s/%Ld, %zu bytes @ offset %Lu)\n",
-				data->task.tk_pid,
-				inode->i_sb->s_id,
-				(long long)NFS_FILEID(inode),
-				bytes,
-				(unsigned long long)data->args.offset);
 
 		started += bytes;
 		user_addr += bytes;