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-rw-r--r--fs/nfs/nfs42proc.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
new file mode 100644
index 000000000..3a9e75235
--- /dev/null
+++ b/fs/nfs/nfs42proc.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
+ */
+#include <linux/fs.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/nfs.h>
+#include <linux/nfs3.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_xdr.h>
+#include <linux/nfs_fs.h>
+#include "nfs4_fs.h"
+#include "nfs42.h"
+
+static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
+ fmode_t fmode)
+{
+ struct nfs_open_context *open;
+ struct nfs_lock_context *lock;
+ int ret;
+
+ open = get_nfs_open_context(nfs_file_open_context(file));
+ lock = nfs_get_lock_context(open);
+ if (IS_ERR(lock)) {
+ put_nfs_open_context(open);
+ return PTR_ERR(lock);
+ }
+
+ ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
+
+ nfs_put_lock_context(lock);
+ put_nfs_open_context(open);
+ return ret;
+}
+
+static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
+ loff_t offset, loff_t len)
+{
+ struct inode *inode = file_inode(filep);
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs42_falloc_args args = {
+ .falloc_fh = NFS_FH(inode),
+ .falloc_offset = offset,
+ .falloc_length = len,
+ .falloc_bitmask = server->cache_consistency_bitmask,
+ };
+ struct nfs42_falloc_res res = {
+ .falloc_server = server,
+ };
+ int status;
+
+ msg->rpc_argp = &args;
+ msg->rpc_resp = &res;
+
+ status = nfs42_set_rw_stateid(&args.falloc_stateid, filep, FMODE_WRITE);
+ if (status)
+ return status;
+
+ res.falloc_fattr = nfs_alloc_fattr();
+ if (!res.falloc_fattr)
+ return -ENOMEM;
+
+ status = nfs4_call_sync(server->client, server, msg,
+ &args.seq_args, &res.seq_res, 0);
+ if (status == 0)
+ status = nfs_post_op_update_inode(inode, res.falloc_fattr);
+
+ kfree(res.falloc_fattr);
+ return status;
+}
+
+static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
+ loff_t offset, loff_t len)
+{
+ struct nfs_server *server = NFS_SERVER(file_inode(filep));
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = _nfs42_proc_fallocate(msg, filep, offset, len);
+ if (err == -ENOTSUPP)
+ return -EOPNOTSUPP;
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+
+ return err;
+}
+
+int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
+ };
+ struct inode *inode = file_inode(filep);
+ int err;
+
+ if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
+ return -EOPNOTSUPP;
+
+ mutex_lock(&inode->i_mutex);
+
+ err = nfs42_proc_fallocate(&msg, filep, offset, len);
+ if (err == -EOPNOTSUPP)
+ NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
+
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+
+int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
+ };
+ struct inode *inode = file_inode(filep);
+ int err;
+
+ if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
+ return -EOPNOTSUPP;
+
+ nfs_wb_all(inode);
+ mutex_lock(&inode->i_mutex);
+
+ err = nfs42_proc_fallocate(&msg, filep, offset, len);
+ if (err == 0)
+ truncate_pagecache_range(inode, offset, (offset + len) -1);
+ if (err == -EOPNOTSUPP)
+ NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
+
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+
+loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
+{
+ struct inode *inode = file_inode(filep);
+ struct nfs42_seek_args args = {
+ .sa_fh = NFS_FH(inode),
+ .sa_offset = offset,
+ .sa_what = (whence == SEEK_HOLE) ?
+ NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
+ };
+ struct nfs42_seek_res res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ struct nfs_server *server = NFS_SERVER(inode);
+ int status;
+
+ if (!nfs_server_capable(inode, NFS_CAP_SEEK))
+ return -ENOTSUPP;
+
+ status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
+ if (status)
+ return status;
+
+ nfs_wb_all(inode);
+ status = nfs4_call_sync(server->client, server, &msg,
+ &args.seq_args, &res.seq_res, 0);
+ if (status == -ENOTSUPP)
+ server->caps &= ~NFS_CAP_SEEK;
+ if (status)
+ return status;
+
+ return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
+}