patch-2.3.99-pre4 linux/fs/nfs/nfs3proc.c

• Lines: 478
• Date: Sat Apr 1 08:04:27 2000
• Orig file: v2.3.99-pre3/linux/fs/nfs/nfs3proc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre3/linux/fs/nfs/nfs3proc.c linux/fs/nfs/nfs3proc.c
@@ -0,0 +1,477 @@
+/*
+ *  linux/fs/nfs/nfs3proc.c
+ *
+ *  Client-side NFSv3 procedures stubs.
+ *
+ *  Copyright (C) 1997, Olaf Kirch
+ */
+
+#include <linux/mm.h>
+#include <linux/utsname.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/nfs.h>
+#include <linux/nfs3.h>
+#include <linux/nfs_fs.h>
+
+#include <asm/segment.h>
+
+#define NFSDBG_FACILITY		NFSDBG_PROC
+
+/*
+ * Bare-bones access to getattr: this is for nfs_read_super.
+ */
+static int
+nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
+		   struct nfs_fattr *fattr)
+{
+	int	status;
+
+	dprintk("NFS call  getroot\n");
+	fattr->valid = 0;
+	status = rpc_call(server->client, NFS3PROC_GETATTR, fhandle, fattr, 0);
+	dprintk("NFS reply getroot\n");
+	return status;
+}
+
+/*
+ * One function for each procedure in the NFS protocol.
+ */
+static int
+nfs3_proc_getattr(struct dentry *dentry, struct nfs_fattr *fattr)
+{
+	int	status;
+
+	dprintk("NFS call  getattr\n");
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFS3PROC_GETATTR,
+			  NFS_FH(dentry), fattr, 0);
+	dprintk("NFS reply getattr\n");
+	return status;
+}
+
+static int
+nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
+			struct iattr *sattr)
+{
+	struct nfs3_sattrargs	arg = { NFS_FH(dentry), sattr, 0, 0 };
+	int	status;
+
+	dprintk("NFS call  setattr\n");
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFS3PROC_SETATTR, &arg, fattr, 0);
+	dprintk("NFS reply setattr\n");
+	return status;
+}
+
+static int
+nfs3_proc_lookup(struct dentry *dir, struct qstr *name,
+		 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_diropargs	arg = { NFS_FH(dir), name->name, name->len };
+	struct nfs3_diropres	res = { &dir_attr, fhandle, fattr };
+	int			status;
+
+	dprintk("NFS call  lookup %s\n", name->name);
+	dir_attr.valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_LOOKUP, &arg, &res, 0);
+	if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR))
+		status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_GETATTR,
+			 fhandle, fattr, 0);
+	dprintk("NFS reply lookup: %d\n", status);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	return status;
+}
+
+static int
+nfs3_proc_access(struct dentry *dentry, int mode, int ruid)
+{
+	struct nfs_fattr	fattr;
+	struct nfs3_accessargs	arg = { NFS_FH(dentry), 0 };
+	struct nfs3_accessres	res = { &fattr, 0 };
+	int	status, flags;
+
+	dprintk("NFS call  access\n");
+	fattr.valid = 0;
+
+	if (mode & MAY_READ)
+		arg.access |= NFS3_ACCESS_READ;
+	if (S_ISDIR(dentry->d_inode->i_mode)) {
+		if (mode & MAY_WRITE)
+			arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
+		if (mode & MAY_EXEC)
+			arg.access |= NFS3_ACCESS_LOOKUP;
+	} else {
+		if (mode & MAY_WRITE)
+			arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
+		if (mode & MAY_EXEC)
+			arg.access |= NFS3_ACCESS_EXECUTE;
+	}
+	flags = (ruid) ? RPC_CALL_REALUID : 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFS3PROC_ACCESS, &arg, &res, flags);
+	nfs_refresh_inode(dentry->d_inode, &fattr);
+	dprintk("NFS reply access\n");
+
+	if (status == 0 && (arg.access & res.access) != arg.access)
+		status = -EACCES;
+	return status;
+}
+
+static int
+nfs3_proc_readlink(struct dentry *dentry, void *buffer, unsigned int buflen)
+{
+	struct nfs_fattr	fattr;
+	struct nfs3_readlinkargs args = { NFS_FH(dentry), buffer, buflen };
+	struct nfs3_readlinkres	res = { &fattr, buffer, buflen };
+	int			status;
+
+	dprintk("NFS call  readlink\n");
+	fattr.valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFS3PROC_READLINK,
+			  &args, &res, 0);
+	nfs_refresh_inode(dentry->d_inode, &fattr);
+	dprintk("NFS reply readlink: %d\n", status);
+	return status;
+}
+
+static int
+nfs3_proc_read(struct dentry *dentry, struct nfs_fattr *fattr, int flags,
+	       loff_t offset, unsigned int count, void *buffer, int *eofp)
+{
+	struct nfs_readargs	arg = { NFS_FH(dentry), offset, count, 1,
+					{{buffer, count}, {0,0}, {0,0}, {0,0},
+					 {0,0}, {0,0}, {0,0}, {0,0}} };
+	struct nfs_readres	res = { fattr, count, 0 };
+	struct rpc_message	msg = { NFS3PROC_READ, &arg, &res, NULL };
+	int			status;
+
+	dprintk("NFS call  read %d @ %Ld\n", count, (long long)offset);
+	fattr->valid = 0;
+	status = rpc_call_sync(NFS_CLIENT(dentry->d_inode), &msg, flags);
+	dprintk("NFS reply read: %d\n", status);
+	*eofp = res.eof;
+	return status;
+}
+
+static int
+nfs3_proc_write(struct dentry *dentry, struct nfs_fattr *fattr, int flags,
+		loff_t offset, unsigned int count,
+		void *buffer, struct nfs_writeverf *verf)
+{
+	struct nfs_writeargs	arg = { NFS_FH(dentry), offset, count,
+					NFS_FILE_SYNC, 1,
+					{{buffer, count}, {0,0}, {0,0}, {0,0},
+					 {0,0}, {0,0}, {0,0}, {0,0}} };
+	struct nfs_writeres	res = { fattr, verf, 0 };
+	struct rpc_message	msg = { NFS3PROC_WRITE, &arg, &res, NULL };
+	int			status, rpcflags = 0;
+
+	dprintk("NFS call  write %d @ %Ld\n", count, (long long)offset);
+	fattr->valid = 0;
+	if (flags & NFS_RW_SWAP)
+		rpcflags |= NFS_RPC_SWAPFLAGS;
+	arg.stable = (flags & NFS_RW_SYNC) ? NFS_FILE_SYNC : NFS_UNSTABLE;
+
+	status = rpc_call_sync(NFS_CLIENT(dentry->d_inode), &msg, rpcflags);
+
+	dprintk("NFS reply read: %d\n", status);
+	return status < 0? status : res.count;
+}
+
+/*
+ * Create a regular file.
+ * For now, we don't implement O_EXCL.
+ */
+static int
+nfs3_proc_create(struct dentry *dir, struct qstr *name, struct iattr *sattr,
+		 int flags, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_createargs	arg = { NFS_FH(dir), name->name, name->len,
+					sattr, 0, { 0, 0 } };
+	struct nfs3_diropres	res = { &dir_attr, fhandle, fattr };
+	int			status;
+
+	dprintk("NFS call  create %s\n", name->name);
+	arg.createmode = NFS3_CREATE_UNCHECKED;
+	if (flags & O_EXCL) {
+		arg.createmode  = NFS3_CREATE_EXCLUSIVE;
+		arg.verifier[0] = jiffies;
+		arg.verifier[1] = current->pid;
+	}
+
+again:
+	dir_attr.valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_CREATE, &arg, &res, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+
+	/* If the server doesn't support the exclusive creation semantics,
+	 * try again with simple 'guarded' mode. */
+	if (status == NFSERR_NOTSUPP) {
+		switch (arg.createmode) {
+			case NFS3_CREATE_EXCLUSIVE:
+				arg.createmode = NFS3_CREATE_GUARDED;
+				break;
+
+			case NFS3_CREATE_GUARDED:
+				arg.createmode = NFS3_CREATE_UNCHECKED;
+				break;
+
+			case NFS3_CREATE_UNCHECKED:
+				goto exit;
+		}
+		goto again;
+	}
+
+exit:
+	dprintk("NFS reply create: %d\n", status);
+
+	/* When we created the file with exclusive semantics, make
+	 * sure we set the attributes afterwards. */
+	if (status == 0 && arg.createmode == NFS3_CREATE_EXCLUSIVE) {
+		struct nfs3_sattrargs	arg = { fhandle, sattr, 0, 0 };
+		dprintk("NFS call  setattr (post-create)\n");
+
+		/* Note: we could use a guarded setattr here, but I'm
+		 * not sure this buys us anything (and I'd have
+		 * to revamp the NFSv3 XDR code) */
+		fattr->valid = 0;
+		status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_SETATTR,
+						&arg, fattr, 0);
+		dprintk("NFS reply setattr (post-create): %d\n", status);
+	}
+
+	return status;
+}
+
+static int
+nfs3_proc_remove(struct dentry *dir, struct qstr *name)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_diropargs	arg = { NFS_FH(dir), name->name, name->len };
+	struct rpc_message	msg = { NFS3PROC_REMOVE, &arg, &dir_attr, NULL };
+	int			status;
+
+	dprintk("NFS call  remove %s\n", name->name);
+	dir_attr.valid = 0;
+	status = rpc_call_sync(NFS_CLIENT(dir->d_inode), &msg, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	dprintk("NFS reply remove: %d\n", status);
+	return status;
+}
+
+static int
+nfs3_proc_rename(struct dentry *old_dir, struct qstr *old_name,
+		 struct dentry *new_dir, struct qstr *new_name)
+{
+	struct nfs_fattr	old_dir_attr, new_dir_attr;
+	struct nfs3_renameargs	arg = { NFS_FH(old_dir),
+					old_name->name, old_name->len,
+					NFS_FH(new_dir),
+					new_name->name, new_name->len };
+	struct nfs3_renameres	res = { &old_dir_attr, &new_dir_attr };
+	int			status;
+
+	dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
+	old_dir_attr.valid = 0;
+	new_dir_attr.valid = 0;
+	status = rpc_call(NFS_CLIENT(old_dir->d_inode), NFS3PROC_RENAME, &arg, &res, 0);
+	nfs_refresh_inode(old_dir->d_inode, &old_dir_attr);
+	nfs_refresh_inode(new_dir->d_inode, &new_dir_attr);
+	dprintk("NFS reply rename: %d\n", status);
+	return status;
+}
+
+static int
+nfs3_proc_link(struct dentry *dentry, struct dentry *dir, struct qstr *name)
+{
+	struct nfs_fattr	dir_attr, fattr;
+	struct nfs3_linkargs	arg = { NFS_FH(dentry), NFS_FH(dir),
+					name->name, name->len };
+	struct nfs3_linkres	res = { &dir_attr, &fattr };
+	int			status;
+
+	dprintk("NFS call  link %s\n", name->name);
+	dir_attr.valid = 0;
+	fattr.valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFS3PROC_LINK, &arg, &res, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	nfs_refresh_inode(dentry->d_inode, &fattr);
+	dprintk("NFS reply link: %d\n", status);
+	return status;
+}
+
+static int
+nfs3_proc_symlink(struct dentry *dir, struct qstr *name, struct qstr *path,
+		  struct iattr *sattr, struct nfs_fh *fhandle,
+		  struct nfs_fattr *fattr)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_symlinkargs	arg = { NFS_FH(dir), name->name, name->len,
+					path->name, path->len, sattr };
+	struct nfs3_diropres	res = { &dir_attr, fhandle, fattr };
+	int			status;
+
+	dprintk("NFS call  symlink %s -> %s\n", name->name, path->name);
+	dir_attr.valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_SYMLINK, &arg, &res, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	dprintk("NFS reply symlink: %d\n", status);
+	return status;
+}
+
+static int
+nfs3_proc_mkdir(struct dentry *dir, struct qstr *name, struct iattr *sattr,
+		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_createargs	arg = { NFS_FH(dir), name->name, name->len,
+					sattr, 0, { 0, 0 } };
+	struct nfs3_diropres	res = { &dir_attr, fhandle, fattr };
+	int			status;
+
+	dprintk("NFS call  mkdir %s\n", name->name);
+	dir_attr.valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_MKDIR, &arg, &res, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	dprintk("NFS reply mkdir: %d\n", status);
+	return status;
+}
+
+static int
+nfs3_proc_rmdir(struct dentry *dir, struct qstr *name)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_diropargs	arg = { NFS_FH(dir), name->name, name->len };
+	int			status;
+
+	dprintk("NFS call  rmdir %s\n", name->name);
+	dir_attr.valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_RMDIR, &arg, &dir_attr, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	dprintk("NFS reply rmdir: %d\n", status);
+	return status;
+}
+
+/*
+ * The READDIR implementation is somewhat hackish - we pass the user buffer
+ * to the encode function, which installs it in the receive iovec.
+ * The decode function itself doesn't perform any decoding, it just makes
+ * sure the reply is syntactically correct.
+ *
+ * Also note that this implementation handles both plain readdir and
+ * readdirplus.
+ */
+static int
+nfs3_proc_readdir(struct dentry *dir, u64 cookie, void *entry,
+		  unsigned int size, int plus)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_readdirargs	arg = { NFS_FH(dir), cookie, {0, 0}, 0, 0, 0 };
+	struct nfs3_readdirres	res = { &dir_attr, 0, 0, 0, 0 };
+	struct rpc_message	msg = { NFS3PROC_READDIR, &arg, &res, NULL };
+	u32			*verf = NFS_COOKIEVERF(dir->d_inode);
+	int			status;
+
+	arg.buffer  = entry;
+	arg.bufsiz  = size;
+	arg.verf[0] = verf[0];
+	arg.verf[1] = verf[1];
+	arg.plus    = plus;
+	res.buffer  = entry;
+	res.bufsiz  = size;
+	res.verf    = verf;
+	res.plus    = plus;
+
+	if (plus)
+		msg.rpc_proc = NFS3PROC_READDIRPLUS;
+
+	dprintk("NFS call  readdir%s %d\n",
+			plus? "plus" : "", (unsigned int) cookie);
+
+	dir_attr.valid = 0;
+	status = rpc_call_sync(NFS_CLIENT(dir->d_inode), &msg, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	dprintk("NFS reply readdir: %d\n", status);
+	return status;
+}
+
+static int
+nfs3_proc_mknod(struct dentry *dir, struct qstr *name, struct iattr *sattr,
+		dev_t rdev, struct nfs_fh *fh, struct nfs_fattr *fattr)
+{
+	struct nfs_fattr	dir_attr;
+	struct nfs3_mknodargs	arg = { NFS_FH(dir), name->name, name->len, 0,
+					sattr, rdev };
+	struct nfs3_diropres	res = { &dir_attr, fh, fattr };
+	int			status;
+
+	switch (sattr->ia_mode & S_IFMT) {
+	case S_IFBLK:	arg.type = NF3BLK;  break;
+	case S_IFCHR:	arg.type = NF3CHR;  break;
+	case S_IFIFO:	arg.type = NF3FIFO; break;
+	case S_IFSOCK:	arg.type = NF3SOCK; break;
+	default:	return -EINVAL;
+	}
+
+	dprintk("NFS call  mknod %s %x\n", name->name, rdev);
+	dir_attr.valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFS3PROC_MKNOD, &arg, &res, 0);
+	nfs_refresh_inode(dir->d_inode, &dir_attr);
+	dprintk("NFS reply mknod: %d\n", status);
+	return status;
+}
+
+/*
+ * This is a combo call of fsstat and fsinfo
+ */
+static int
+nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
+		 struct nfs_fsinfo *info)
+{
+	int	status;
+
+	dprintk("NFS call  fsstat\n");
+	memset((char *)info, 0, sizeof(*info));
+	status = rpc_call(server->client, NFS3PROC_FSSTAT, fhandle, info, 0);
+	if (status < 0)
+		goto error;
+	status = rpc_call(server->client, NFS3PROC_FSINFO, fhandle, info, 0);
+
+error:
+	dprintk("NFS reply statfs: %d\n", status);
+	return status;
+}
+
+extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
+
+struct nfs_rpc_ops	nfs_v3_clientops = {
+	3,			/* protocol version */
+	nfs3_proc_get_root,
+	nfs3_proc_getattr,
+	nfs3_proc_setattr,
+	nfs3_proc_lookup,
+	nfs3_proc_access,
+	nfs3_proc_readlink,
+	nfs3_proc_read,
+	nfs3_proc_write,
+	NULL,			/* commit */
+	nfs3_proc_create,
+	nfs3_proc_remove,
+	nfs3_proc_rename,
+	nfs3_proc_link,
+	nfs3_proc_symlink,
+	nfs3_proc_mkdir,
+	nfs3_proc_rmdir,
+	nfs3_proc_readdir,
+	nfs3_proc_mknod,
+	nfs3_proc_statfs,
+	nfs3_decode_dirent,
+};