NFS: Remove nfs_readpage_sync()

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

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 2 insertions, 196 deletions

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index acd8fe9762d3..7d0371e2bad5 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -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,
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 665859214fa2..5b2446173dd8 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -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,
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 560536ad74a4..1dcf56de9482 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -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,
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index a9c26521a9e2..4affb536ada3 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -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:
+        error = nfs_readpage_async(ctx, inode, page);
+
         put_nfs_open_context(ctx);
         return error;