NFS: Remove nfs_writepage_sync()

Maintaining two parallel ways of doing synchronous writes is rather
pointless. This patch gets rid of the legacy nfs_writepage_sync(), and
replaces it with the faster asynchronous writes.

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

5 files changed, 10 insertions, 256 deletions

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index d6ee60fc3ba6..143a19037ce8 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -378,6 +378,12 @@ static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
 
         nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count);
         result = generic_file_aio_write(iocb, iov, nr_segs, pos);
+        /* Return error values for O_SYNC and IS_SYNC() */
+        if (result >= 0 && (IS_SYNC(inode) || (iocb->ki_filp->f_flags & O_SYNC))) {
+                int err = nfs_fsync(iocb->ki_filp, dentry, 1);
+                if (err < 0)
+                        result = err;
+        }
 out:
         return result;
 
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 7fba06306b82..510ae524f3fd 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -276,51 +276,6 @@ static int nfs3_proc_read(struct nfs_read_data *rdata)
         return status;
 }
 
-static int nfs3_proc_write(struct nfs_write_data *wdata)
-{
-        int                     rpcflags = wdata->flags;
-        struct inode *          inode = wdata->inode;
-        struct nfs_fattr *      fattr = wdata->res.fattr;
-        struct rpc_message      msg = {
-                .rpc_proc       = &nfs3_procedures[NFS3PROC_WRITE],
-                .rpc_argp       = &wdata->args,
-                .rpc_resp       = &wdata->res,
-                .rpc_cred       = wdata->cred,
-        };
-        int                     status;
-
-        dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
-                        (long long) wdata->args.offset);
-        nfs_fattr_init(fattr);
-        status = rpc_call_sync(NFS_CLIENT(inode), &msg, rpcflags);
-        if (status >= 0)
-                nfs_post_op_update_inode(inode, fattr);
-        dprintk("NFS reply write: %d\n", status);
-        return status < 0? status : wdata->res.count;
-}
-
-static int nfs3_proc_commit(struct nfs_write_data *cdata)
-{
-        struct inode *          inode = cdata->inode;
-        struct nfs_fattr *      fattr = cdata->res.fattr;
-        struct rpc_message      msg = {
-                .rpc_proc       = &nfs3_procedures[NFS3PROC_COMMIT],
-                .rpc_argp       = &cdata->args,
-                .rpc_resp       = &cdata->res,
-                .rpc_cred       = cdata->cred,
-        };
-        int                     status;
-
-        dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
-                        (long long) cdata->args.offset);
-        nfs_fattr_init(fattr);
-        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
-        if (status >= 0)
-                nfs_post_op_update_inode(inode, fattr);
-        dprintk("NFS reply commit: %d\n", status);
-        return status;
-}
-
 /*
  * Create a regular file.
  * For now, we don't implement O_EXCL.
@@ -901,8 +856,6 @@ const struct nfs_rpc_ops nfs_v3_clientops = {
         .access         = nfs3_proc_access,
         .readlink       = nfs3_proc_readlink,
         .read           = nfs3_proc_read,
-        .write          = nfs3_proc_write,
-        .commit         = nfs3_proc_commit,
         .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 4b5fc714d786..ee458aeab24a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1775,89 +1775,6 @@ static int nfs4_proc_read(struct nfs_read_data *rdata)
         return err;
 }
 
-static int _nfs4_proc_write(struct nfs_write_data *wdata)
-{
-        int rpcflags = wdata->flags;
-        struct inode *inode = wdata->inode;
-        struct nfs_fattr *fattr = wdata->res.fattr;
-        struct nfs_server *server = NFS_SERVER(inode);
-        struct rpc_message msg = {
-                .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
-                .rpc_argp       = &wdata->args,
-                .rpc_resp       = &wdata->res,
-                .rpc_cred       = wdata->cred,
-        };
-        int status;
-
-        dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
-                        (long long) wdata->args.offset);
-
-        wdata->args.bitmask = server->attr_bitmask;
-        wdata->res.server = server;
-        wdata->timestamp = jiffies;
-        nfs_fattr_init(fattr);
-        status = rpc_call_sync(server->client, &msg, rpcflags);
-        dprintk("NFS reply write: %d\n", status);
-        if (status < 0)
-                return status;
-        renew_lease(server, wdata->timestamp);
-        nfs_post_op_update_inode(inode, fattr);
-        return wdata->res.count;
-}
-
-static int nfs4_proc_write(struct nfs_write_data *wdata)
-{
-        struct nfs4_exception exception = { };
-        int err;
-        do {
-                err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
-                                _nfs4_proc_write(wdata),
-                                &exception);
-        } while (exception.retry);
-        return err;
-}
-
-static int _nfs4_proc_commit(struct nfs_write_data *cdata)
-{
-        struct inode *inode = cdata->inode;
-        struct nfs_fattr *fattr = cdata->res.fattr;
-        struct nfs_server *server = NFS_SERVER(inode);
-        struct rpc_message msg = {
-                .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
-                .rpc_argp       = &cdata->args,
-                .rpc_resp       = &cdata->res,
-                .rpc_cred       = cdata->cred,
-        };
-        int status;
-
-        dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
-                        (long long) cdata->args.offset);
-
-        cdata->args.bitmask = server->attr_bitmask;
-        cdata->res.server = server;
-        cdata->timestamp = jiffies;
-        nfs_fattr_init(fattr);
-        status = rpc_call_sync(server->client, &msg, 0);
-        if (status >= 0)
-                renew_lease(server, cdata->timestamp);
-        dprintk("NFS reply commit: %d\n", status);
-        if (status >= 0)
-                nfs_post_op_update_inode(inode, fattr);
-        return status;
-}
-
-static int nfs4_proc_commit(struct nfs_write_data *cdata)
-{
-        struct nfs4_exception exception = { };
-        int err;
-        do {
-                err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
-                                _nfs4_proc_commit(cdata),
-                                &exception);
-        } while (exception.retry);
-        return err;
-}
-
 /*
  * Got race?
  * We will need to arrange for the VFS layer to provide an atomic open.
@@ -3730,8 +3647,6 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
         .access         = nfs4_proc_access,
         .readlink       = nfs4_proc_readlink,
         .read           = nfs4_proc_read,
-        .write          = nfs4_proc_write,
-        .commit         = nfs4_proc_commit,
         .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 7a9013dd5d0a..10f5e80ca157 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -215,32 +215,6 @@ static int nfs_proc_read(struct nfs_read_data *rdata)
         return status;
 }
 
-static int nfs_proc_write(struct nfs_write_data *wdata)
-{
-        int                     flags = wdata->flags;
-        struct inode *          inode = wdata->inode;
-        struct nfs_fattr *      fattr = wdata->res.fattr;
-        struct rpc_message      msg = {
-                .rpc_proc       = &nfs_procedures[NFSPROC_WRITE],
-                .rpc_argp       = &wdata->args,
-                .rpc_resp       = &wdata->res,
-                .rpc_cred       = wdata->cred,
-        };
-        int                     status;
-
-        dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
-                        (long long) wdata->args.offset);
-        nfs_fattr_init(fattr);
-        status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
-        if (status >= 0) {
-                nfs_post_op_update_inode(inode, fattr);
-                wdata->res.count = wdata->args.count;
-                wdata->verf.committed = NFS_FILE_SYNC;
-        }
-        dprintk("NFS reply write: %d\n", status);
-        return status < 0? status : wdata->res.count;
-}
-
 static int
 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
                 int flags, struct nameidata *nd)
@@ -693,8 +667,6 @@ const struct nfs_rpc_ops nfs_v2_clientops = {
         .access         = NULL,                /* access */
         .readlink       = nfs_proc_readlink,
         .read           = nfs_proc_read,
-        .write          = nfs_proc_write,
-        .commit         = NULL,                /* commit */
         .create         = nfs_proc_create,
         .remove         = nfs_proc_remove,
         .unlink_setup   = nfs_proc_unlink_setup,
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index de9a16a8f7e4..f0720b544b12 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -210,78 +210,6 @@ static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int
         SetPageUptodate(page);
 }
 
-/*
- * Write a page synchronously.
- * Offset is the data offset within the page.
- */
-static int nfs_writepage_sync(struct nfs_open_context *ctx, struct page *page,
-                unsigned int offset, unsigned int count, int how)
-{
-        struct inode *inode = page->mapping->host;
-        unsigned int    wsize = NFS_SERVER(inode)->wsize;
-        int             result, written = 0;
-        struct nfs_write_data *wdata;
-
-        wdata = nfs_writedata_alloc(wsize);
-        if (!wdata)
-                return -ENOMEM;
-
-        wdata->flags = how;
-        wdata->cred = ctx->cred;
-        wdata->inode = inode;
-        wdata->args.fh = NFS_FH(inode);
-        wdata->args.context = ctx;
-        wdata->args.pages = &page;
-        wdata->args.stable = NFS_FILE_SYNC;
-        wdata->args.pgbase = offset;
-        wdata->args.count = wsize;
-        wdata->res.fattr = &wdata->fattr;
-        wdata->res.verf = &wdata->verf;
-
-        dprintk("NFS:      nfs_writepage_sync(%s/%Ld %d@%Ld)\n",
-                inode->i_sb->s_id,
-                (long long)NFS_FILEID(inode),
-                count, (long long)(page_offset(page) + offset));
-
-        set_page_writeback(page);
-        nfs_begin_data_update(inode);
-        do {
-                if (count < wsize)
-                        wdata->args.count = count;
-                wdata->args.offset = page_offset(page) + wdata->args.pgbase;
-
-                result = NFS_PROTO(inode)->write(wdata);
-
-                if (result < 0) {
-                        /* Must mark the page invalid after I/O error */
-                        ClearPageUptodate(page);
-                        goto io_error;
-                }
-                if (result < wdata->args.count)
-                        printk(KERN_WARNING "NFS: short write, count=%u, result=%d\n",
-                                        wdata->args.count, result);
-
-                wdata->args.offset += result;
-                wdata->args.pgbase += result;
-                written += result;
-                count -= result;
-                nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, result);
-        } while (count);
-        /* Update file length */
-        nfs_grow_file(page, offset, written);
-        /* Set the PG_uptodate flag? */
-        nfs_mark_uptodate(page, offset, written);
-
-        if (PageError(page))
-                ClearPageError(page);
-
-io_error:
-        nfs_end_data_update(inode);
-        end_page_writeback(page);
-        nfs_writedata_release(wdata);
-        return written ? written : result;
-}
-
 static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
                 unsigned int offset, unsigned int count)
 {
@@ -342,22 +270,12 @@ int nfs_writepage(struct page *page, struct writeback_control *wbc)
                 err = -EBADF;
                 goto out;
         }
-        lock_kernel();
-        if (!IS_SYNC(inode)) {
-                err = nfs_writepage_setup(ctx, page, 0, offset);
-                if (!wbc->for_writepages)
-                        nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc));
-        } else {
-                err = nfs_writepage_sync(ctx, page, 0, offset, wb_priority(wbc));
-                if (err >= 0) {
-                        if (err != offset)
-                                redirty_page_for_writepage(wbc, page);
-                        err = 0;
-                }
-        }
-        unlock_kernel();
+        err = nfs_writepage_setup(ctx, page, 0, offset);
         put_nfs_open_context(ctx);
+
 out:
+        if (!wbc->for_writepages)
+                nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc));
         unlock_page(page);
         return err; 
 }
@@ -777,16 +695,6 @@ int nfs_updatepage(struct file *file, struct page *page,
                 file->f_dentry->d_name.name, count,
                 (long long)(page_offset(page) +offset));
 
-        if (IS_SYNC(inode)) {
-                status = nfs_writepage_sync(ctx, page, offset, count, 0);
-                if (status > 0) {
-                        if (offset == 0 && status == PAGE_CACHE_SIZE)
-                                SetPageUptodate(page);
-                        return 0;
-                }
-                return status;
-        }
-
         /* If we're not using byte range locks, and we know the page
          * is entirely in cache, it may be more efficient to avoid
          * fragmenting write requests.