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Commit 8e0969f0 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS: Remove nfs_readpage_sync() 



It makes no sense to maintain 2 parallel systems for reading in pages.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent c228fd3a

fs/nfs/nfs3proc.c

+0 −24
Original line number Diff line number Diff line
@@ -253,29 +253,6 @@ static int nfs3_proc_readlink(struct inode *inode, struct page *page, 
	return status;

}



static int nfs3_proc_read(struct nfs_read_data *rdata)

{

	int			flags = rdata->flags;

	struct inode *		inode = rdata->inode;

	struct nfs_fattr *	fattr = rdata->res.fattr;

	struct rpc_message	msg = {

		.rpc_proc	= &nfs3_procedures[NFS3PROC_READ],

		.rpc_argp	= &rdata->args,

		.rpc_resp	= &rdata->res,

		.rpc_cred	= rdata->cred,

	};

	int			status;



	dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,

			(long long) rdata->args.offset);

	nfs_fattr_init(fattr);

	status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);

	if (status >= 0)

		nfs_refresh_inode(inode, fattr);

	dprintk("NFS reply read: %d\n", status);

	return status;

}



/*

 * Create a regular file.

 * For now, we don't implement O_EXCL.
@@ -855,7 +832,6 @@ const struct nfs_rpc_ops nfs_v3_clientops = { 
	.lookup		= nfs3_proc_lookup,

	.access		= nfs3_proc_access,

	.readlink	= nfs3_proc_readlink,

	.read		= nfs3_proc_read,

	.create		= nfs3_proc_create,

	.remove		= nfs3_proc_remove,

	.unlink_setup	= nfs3_proc_unlink_setup,

fs/nfs/nfs4proc.c

+0 −39
Original line number Diff line number Diff line
@@ -1734,44 +1734,6 @@ static int nfs4_proc_readlink(struct inode *inode, struct page *page, 
	return err;

}



static int _nfs4_proc_read(struct nfs_read_data *rdata)

{

	int flags = rdata->flags;

	struct inode *inode = rdata->inode;

	struct nfs_fattr *fattr = rdata->res.fattr;

	struct nfs_server *server = NFS_SERVER(inode);

	struct rpc_message msg = {

		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_READ],

		.rpc_argp	= &rdata->args,

		.rpc_resp	= &rdata->res,

		.rpc_cred	= rdata->cred,

	};

	unsigned long timestamp = jiffies;

	int status;



	dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,

			(long long) rdata->args.offset);



	nfs_fattr_init(fattr);

	status = rpc_call_sync(server->client, &msg, flags);

	if (!status)

		renew_lease(server, timestamp);

	dprintk("NFS reply read: %d\n", status);

	return status;

}



static int nfs4_proc_read(struct nfs_read_data *rdata)

{

	struct nfs4_exception exception = { };

	int err;

	do {

		err = nfs4_handle_exception(NFS_SERVER(rdata->inode),

				_nfs4_proc_read(rdata),

				&exception);

	} while (exception.retry);

	return err;

}



/*

 * Got race?

 * We will need to arrange for the VFS layer to provide an atomic open.
@@ -3643,7 +3605,6 @@ const struct nfs_rpc_ops nfs_v4_clientops = { 
	.lookup		= nfs4_proc_lookup,

	.access		= nfs4_proc_access,

	.readlink	= nfs4_proc_readlink,

	.read		= nfs4_proc_read,

	.create		= nfs4_proc_create,

	.remove		= nfs4_proc_remove,

	.unlink_setup	= nfs4_proc_unlink_setup,

fs/nfs/proc.c

+0 −30
Original line number Diff line number Diff line
@@ -186,35 +186,6 @@ static int nfs_proc_readlink(struct inode *inode, struct page *page, 
	return status;

}



static int nfs_proc_read(struct nfs_read_data *rdata)

{

	int			flags = rdata->flags;

	struct inode *		inode = rdata->inode;

	struct nfs_fattr *	fattr = rdata->res.fattr;

	struct rpc_message	msg = {

		.rpc_proc	= &nfs_procedures[NFSPROC_READ],

		.rpc_argp	= &rdata->args,

		.rpc_resp	= &rdata->res,

		.rpc_cred	= rdata->cred,

	};

	int			status;



	dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,

			(long long) rdata->args.offset);

	nfs_fattr_init(fattr);

	status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);

	if (status >= 0) {

		nfs_refresh_inode(inode, fattr);

		/* Emulate the eof flag, which isn't normally needed in NFSv2

		 * as it is guaranteed to always return the file attributes

		 */

		if (rdata->args.offset + rdata->args.count >= fattr->size)

			rdata->res.eof = 1;

	}

	dprintk("NFS reply read: %d\n", status);

	return status;

}



static int

nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,

		int flags, struct nameidata *nd)
@@ -666,7 +637,6 @@ const struct nfs_rpc_ops nfs_v2_clientops = { 
	.lookup		= nfs_proc_lookup,

	.access		= NULL,		       /* access */

	.readlink	= nfs_proc_readlink,

	.read		= nfs_proc_read,

	.create		= nfs_proc_create,

	.remove		= nfs_proc_remove,

	.unlink_setup	= nfs_proc_unlink_setup,

fs/nfs/read.c

+2 −103
Original line number Diff line number Diff line
@@ -5,14 +5,6 @@ 
 *

 * Partial copy of Linus' read cache modifications to fs/nfs/file.c

 * modified for async RPC by okir@monad.swb.de

 *

 * We do an ugly hack here in order to return proper error codes to the

 * user program when a read request failed: since generic_file_read

 * only checks the return value of inode->i_op->readpage() which is always 0

 * for async RPC, we set the error bit of the page to 1 when an error occurs,

 * and make nfs_readpage transmit requests synchronously when encountering this.

 * This is only a small problem, though, since we now retry all operations

 * within the RPC code when root squashing is suspected.

 */



#include <linux/time.h>
@@ -122,93 +114,6 @@ static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data) 
	}

}



/*

 * Read a page synchronously.

 */

static int nfs_readpage_sync(struct nfs_open_context *ctx, struct inode *inode,

		struct page *page)

{

	unsigned int	rsize = NFS_SERVER(inode)->rsize;

	unsigned int	count = PAGE_CACHE_SIZE;

	int result = -ENOMEM;

	struct nfs_read_data *rdata;



	rdata = nfs_readdata_alloc(count);

	if (!rdata)

		goto out_unlock;



	memset(rdata, 0, sizeof(*rdata));

	rdata->flags = (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);

	rdata->cred = ctx->cred;

	rdata->inode = inode;

	INIT_LIST_HEAD(&rdata->pages);

	rdata->args.fh = NFS_FH(inode);

	rdata->args.context = ctx;

	rdata->args.pages = &page;

	rdata->args.pgbase = 0UL;

	rdata->args.count = rsize;

	rdata->res.fattr = &rdata->fattr;



	dprintk("NFS: nfs_readpage_sync(%p)\n", page);



	/*

	 * This works now because the socket layer never tries to DMA

	 * into this buffer directly.

	 */

	do {

		if (count < rsize)

			rdata->args.count = count;

		rdata->res.count = rdata->args.count;

		rdata->args.offset = page_offset(page) + rdata->args.pgbase;



		dprintk("NFS: nfs_proc_read(%s, (%s/%Ld), %Lu, %u)\n",

			NFS_SERVER(inode)->nfs_client->cl_hostname,

			inode->i_sb->s_id,

			(long long)NFS_FILEID(inode),

			(unsigned long long)rdata->args.pgbase,

			rdata->args.count);



		lock_kernel();

		result = NFS_PROTO(inode)->read(rdata);

		unlock_kernel();



		/*

		 * Even if we had a partial success we can't mark the page

		 * cache valid.

		 */

		if (result < 0) {

			if (result == -EISDIR)

				result = -EINVAL;

			goto io_error;

		}

		count -= result;

		rdata->args.pgbase += result;

		nfs_add_stats(inode, NFSIOS_SERVERREADBYTES, result);



		/* Note: result == 0 should only happen if we're caching

		 * a write that extends the file and punches a hole.

		 */

		if (rdata->res.eof != 0 || result == 0)

			break;

	} while (count);

	spin_lock(&inode->i_lock);

	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;

	spin_unlock(&inode->i_lock);



	if (rdata->res.eof || rdata->res.count == rdata->args.count) {

		SetPageUptodate(page);

		if (rdata->res.eof && count != 0)

			memclear_highpage_flush(page, rdata->args.pgbase, count);

	}

	result = 0;



io_error:

	nfs_readdata_free(rdata);

out_unlock:

	unlock_page(page);

	return result;

}



static int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,

		struct page *page)

{
@@ -621,15 +526,9 @@ int nfs_readpage(struct file *file, struct page *page) 
	} else

		ctx = get_nfs_open_context((struct nfs_open_context *)

				file->private_data);

	if (!IS_SYNC(inode)) {



	error = nfs_readpage_async(ctx, inode, page);

		goto out;

	}



	error = nfs_readpage_sync(ctx, inode, page);

	if (error < 0 && IS_SWAPFILE(inode))

		printk("Aiee.. nfs swap-in of page failed!\n");

out:

	put_nfs_open_context(ctx);

	return error;

include/linux/nfs_xdr.h

+0 −1
Original line number Diff line number Diff line
@@ -784,7 +784,6 @@ struct nfs_rpc_ops { 
	int	(*access)  (struct inode *, struct nfs_access_entry *);

	int	(*readlink)(struct inode *, struct page *, unsigned int,

			    unsigned int);

	int	(*read)    (struct nfs_read_data *);

	int	(*create)  (struct inode *, struct dentry *,

			    struct iattr *, int, struct nameidata *);

	int	(*remove)  (struct inode *, struct qstr *);