patch-2.1.32 linux/fs/nfsd/nfs3proc.c

• Lines: 530
• Date: Fri Apr 4 11:06:02 1997
• Orig file: v2.1.31/linux/fs/nfsd/nfs3proc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/fs/nfsd/nfs3proc.c linux/fs/nfsd/nfs3proc.c
@@ -0,0 +1,529 @@
+/*
+ * linux/fs/nfsd/nfs3proc.c
+ *
+ * Process version 3 NFS requests.
+ *
+ * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/linkage.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/locks.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/version.h>
+#include <linux/unistd.h>
+#include <linux/malloc.h>
+
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfsd/cache.h>
+#include <linux/nfsd/xdr3.h>
+
+typedef struct svc_rqst	svc_rqst;
+typedef struct svc_buf	svc_buf;
+
+#define NFSDDBG_FACILITY		NFSDDBG_PROC
+
+#define RETURN(st)	{ resp->status = (st); return (st); }
+
+static void
+svcbuf_reserve(struct svc_buf *buf, u32 **ptr, int *len, int nr)
+{
+	*ptr = buf->buf + nr;
+	*len = buf->buflen - buf->len - nr;
+}
+
+static int
+nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
+{
+	return nfs_ok;
+}
+
+/*
+ * Get a file's attributes
+ */
+static int
+nfsd3_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
+					   struct nfsd3_attrstat *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: GETATTR  %x/%ld\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh));
+
+	resp->fh = argp->fh;
+	nfserr = fh_lookup(rqstp, &resp->fh, 0, MAY_NOP);
+	RETURN(nfserr);
+}
+
+/*
+ * Set a file's attributes
+ */
+static int
+nfsd3_proc_setattr(struct svc_rqst *rqstp, struct nfsd3_sattrargs *argp,
+					   struct nfsd3_attrstat  *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: SETATTR  %x/%ld\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh));
+
+	resp->fh = argp->fh;
+	nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs);
+	RETURN(nfserr);
+}
+
+/*
+ * Look up a path name component
+ */
+static int
+nfsd3_proc_lookup(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
+					  struct nfsd3_lookupres *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: LOOKUP   %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	resp->dirfh = argp->fh;
+	nfserr = nfsd_lookup(rqstp, &resp->dirfh,
+				    argp->name,
+				    argp->len,
+				    &resp->fh);
+	RETURN(nfserr);
+}
+
+/*
+ * Check file access
+ */
+static int
+nfsd3_proc_access(struct svc_rqst *rqstp, struct nfsd_fhandle   *argp,
+					  struct nfsd3_accessres *resp)
+{
+	/* to be done */
+	resp->fh = argp->fh;
+	return nfserr_notsupp;
+}
+
+/*
+ * Read a symlink.
+ */
+static int
+nfsd3_proc_readlink(struct svc_rqst *rqstp, struct nfsd_fhandle     *argp,
+					   struct nfsd3_readlinkres *resp)
+{
+	u32		*path;
+	int		dummy, nfserr;
+
+	dprintk("nfsd: READLINK %x/%ld\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh));
+
+	/* Reserve room for status, post_op_attr, and path length */
+	svcbuf_reserve(&rqstp->rq_resbuf, &path, &dummy, 1 + 22 + 1);
+
+	/* Read the symlink. */
+	resp->len = NFS3_MAXPATHLEN;
+	nfserr = nfsd_readlink(rqstp, &argp->fh, (char *) path, &resp->len);
+	RETURN(nfserr);
+}
+
+/*
+ * Read a portion of a file.
+ */
+static int
+nfsd3_proc_read(struct svc_rqst *rqstp, struct nfsd3_readargs *argp,
+				        struct nfsd3_readres  *resp)
+{
+	u32 *	buffer;
+	int	nfserr, avail;
+
+	dprintk("nfsd: READ %x/%ld %lu bytes at %lu\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				(unsigned long) argp->count,
+				(unsigned long) argp->offset);
+
+	/* Obtain buffer pointer for payload.
+	 * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
+	 * + 1 (xdr opaque byte count) = 26
+	 */
+	svcbuf_reserve(&rqstp->rq_resbuf, &buffer, &avail, 26);
+
+	if ((avail << 2) < argp->count) {
+		printk(KERN_NOTICE
+			"oversized read request from %08lx:%d (%d bytes)\n",
+				ntohl(rqstp->rq_addr.sin_addr.s_addr),
+				ntohs(rqstp->rq_addr.sin_port),
+				argp->count);
+		argp->count = avail;
+	}
+
+	resp->count = argp->count;
+	resp->fh    = argp->fh;
+	nfserr = nfsd_read(rqstp, &resp->fh,
+				  argp->offset,
+				  (char *) buffer,
+				  &resp->count);
+
+	RETURN(nfserr);
+}
+
+/*
+ * Write data to a file
+ */
+static int
+nfsd3_proc_write(struct svc_rqst *rqstp, struct nfsd3_writeargs *argp,
+					 struct nfsd3_writeres  *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: WRITE    %x/%ld %d bytes at %ld\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->len,
+				(unsigned long) argp->offset);
+
+	resp->fh = argp->fh;
+	nfserr = nfsd_write(rqstp, &resp->fh,
+				   argp->offset,
+				   argp->data,
+				   argp->len,
+				   argp->stable);
+	resp->committed = argp->stable;
+	RETURN(nfserr);
+}
+
+/*
+ * With NFSv3, CREATE processing is a lot easier than with NFSv2.
+ * At least in theory; we'll see how it fares in practice when the
+ * first reports about SunOS compatibility problems start to pour in...
+ */
+static int
+nfsd3_proc_create(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
+					  struct nfsd3_createres  *resp)
+{
+	svc_fh		*dirfhp, *newfhp = NULL;
+	struct iattr	*attr;
+	int		mode;
+	u32		nfserr;
+
+	dprintk("nfsd: CREATE   %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	dirfhp = fh_copy(&resp->dirfh, &argp->fh);
+	newfhp = fh_init(&resp->fh);
+	attr   = &argp->attrs;
+
+	/* Get the directory inode */
+	nfserr = fh_lookup(rqstp, dirfhp, S_IFDIR, MAY_CREATE);
+	if (nfserr)
+		RETURN(nfserr);
+
+	/* Unfudge the mode bits */
+	attr->ia_mode &= ~S_IFMT;
+	if (!(attr->ia_valid & ATTR_MODE)) { 
+		attr->ia_valid |= ATTR_MODE;
+		attr->ia_mode = S_IFREG;
+	}
+	mode = attr->ia_mode & ~S_IFMT;
+
+	/* Now create the file and set attributes */
+	nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
+				attr, S_IFREG, 0, newfhp,
+				argp->createmode);
+
+	RETURN(nfserr);
+}
+
+static int
+nfsd3_proc_remove(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
+					  struct nfsd3_attrstat  *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: REMOVE   %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	fh_copy(&resp->fh, &argp->fh);
+
+	/* Unlink. -S_IFDIR means file must not be a directory */
+	nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
+					argp->name, argp->len);
+	RETURN(nfserr);
+}
+
+static int
+nfsd3_proc_rename(struct svc_rqst *rqstp, struct nfsd3_renameargs *argp,
+				  	 void		        *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: RENAME   %x/%ld %s -> %x/%ld %s\n",
+				SVCFH_DEV(&argp->ffh),
+				SVCFH_INO(&argp->ffh),
+				argp->fname,
+				SVCFH_DEV(&argp->tfh),
+				SVCFH_INO(&argp->tfh),
+				argp->tname);
+
+	nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
+				    &argp->tfh, argp->tname, argp->tlen);
+	fh_put(&argp->ffh);
+	fh_put(&argp->tfh);
+	RETURN(nfserr);
+}
+
+static int
+nfsd3_proc_link(struct svc_rqst *rqstp, struct nfsd3_linkargs *argp,
+				void			    *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: LINK     %x/%ld -> %x/%ld %s\n",
+				SVCFH_DEV(&argp->ffh),
+				SVCFH_INO(&argp->ffh),
+				SVCFH_DEV(&argp->tfh),
+				SVCFH_INO(&argp->tfh),
+				argp->tname);
+
+	nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
+				  &argp->ffh);
+	fh_put(&argp->ffh);
+	fh_put(&argp->tfh);
+	RETURN(nfserr);
+}
+
+static int
+nfsd3_proc_symlink(struct svc_rqst *rqstp, struct nfsd3_symlinkargs *argp,
+				          void			  *resp)
+{
+	struct svc_fh	newfh;
+	int		nfserr;
+
+	dprintk("nfsd: SYMLINK  %x/%ld %s -> %s\n",
+				SVCFH_DEV(&argp->ffh),
+				SVCFH_INO(&argp->ffh),
+				argp->fname, argp->tname);
+
+	memset(&newfh, 0, sizeof(newfh));
+
+	/*
+	 * Create the link, look up new file and set attrs.
+	 */
+	nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
+						 argp->tname, argp->tlen,
+						 &newfh);
+	if (nfserr)
+		nfserr = nfsd_setattr(rqstp, &newfh, &argp->attrs);
+
+	fh_put(&argp->ffh);
+	fh_put(&newfh);
+	RETURN(nfserr);
+}
+
+/*
+ * Make directory. This operation is not idempotent.
+ */
+static int
+nfsd3_proc_mkdir(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
+					struct nfsd3_diropres   *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: MKDIR    %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
+				    &argp->attrs, S_IFDIR, 0, &resp->fh);
+	fh_put(&argp->fh);
+	RETURN(nfserr);
+}
+
+/*
+ * Remove a directory
+ */
+static int
+nfsd3_proc_rmdir(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
+				 	void		      *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: RMDIR    %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
+	fh_put(&argp->fh);
+	RETURN(nfserr);
+}
+
+/*
+ * Read a portion of a directory.
+ */
+static int
+nfsd3_proc_readdir(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp,
+					  struct nfsd3_readdirres  *resp)
+{
+	u32 *	buffer;
+	int	nfserr, count;
+
+	dprintk("nfsd: READDIR  %x/%ld %d bytes at %d\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->count, argp->cookie);
+
+	/* Reserve buffer space for status */
+	svcbuf_reserve(&rqstp->rq_resbuf, &buffer, &count, 1);
+
+	/* Make sure we've room for the NULL ptr & eof flag, and shrink to
+	 * client read size */
+	if ((count -= 8) > argp->count)
+		count = argp->count;
+
+	/* Read directory and encode entries on the fly */
+	nfserr = nfsd_readdir(rqstp, &argp->fh, (loff_t) argp->cookie, 
+					nfssvc_encode_entry,
+					buffer, &count);
+	resp->count = count;
+
+	fh_put(&argp->fh);
+	RETURN(nfserr);
+}
+
+/*
+ * Get file system info
+ */
+static int
+nfsd3_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
+					  struct nfsd3_statfsres *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: STATFS   %x/%ld\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh));
+
+	nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats);
+	fh_put(&argp->fh);
+	RETURN(nfserr);
+}
+
+/*
+ * NFSv2 Server procedures.
+ * Only the results of non-idempotent operations are cached.
+ */
+#define nfsd3_proc_none		NULL
+#define nfssvc_encode_void	NULL
+#define nfssvc_decode_void	NULL
+#define nfssvc_release_void	NULL
+struct nfsd3_void { int dummy; };
+
+#define PROC(name, argt, rest, relt, cache)	\
+ { (svc_procfunc) nfsd3_proc_##name,	\
+   (kxdrproc_t) nfssvc_decode_##argt,	\
+   (kxdrproc_t) nfssvc_encode_##rest,	\
+   (kxdrproc_t) nfssvc_release_##relt,	\
+   sizeof(struct nfsd3_##argt),		\
+   sizeof(struct nfsd3_##rest),		\
+   0,					\
+   cache				\
+ }
+struct svc_procedure		nfsd3_procedures2[18] = {
+  PROC(null,	 void,		void,		void,	 RC_NOCACHE),
+  PROC(getattr,	 fhandle,	attrstat,	fhandle, RC_NOCACHE),
+  PROC(setattr,  sattrargs,	attrstat,	fhandle, RC_REPLBUFF),
+  PROC(none,	 void,		void,		void,	 RC_NOCACHE),
+  PROC(lookup,	 diropargs,	diropres,	fhandle, RC_NOCACHE),
+  PROC(readlink, fhandle,	readlinkres,	void,	 RC_NOCACHE),
+  PROC(read,	 readargs,	readres,	fhandle, RC_NOCACHE),
+  PROC(none,	 void,		void,		void,	 RC_NOCACHE),
+  PROC(write,	 writeargs,	attrstat,	fhandle, RC_REPLBUFF),
+  PROC(create,	 createargs,	diropres,	fhandle, RC_REPLBUFF),
+  PROC(remove,	 diropargs,	void,		void,	 RC_REPLSTAT),
+  PROC(rename,	 renameargs,	void,		void,	 RC_REPLSTAT),
+  PROC(link,	 linkargs,	void,		void,	 RC_REPLSTAT),
+  PROC(symlink,	 symlinkargs,	void,		void,	 RC_REPLSTAT),
+  PROC(mkdir,	 createargs,	diropres,	fhandle, RC_REPLBUFF),
+  PROC(rmdir,	 diropargs,	void,		void,	 RC_REPLSTAT),
+  PROC(readdir,	 readdirargs,	readdirres,	void,	 RC_REPLSTAT),
+  PROC(statfs,	 fhandle,	statfsres,	void,	 RC_NOCACHE),
+};
+
+
+/*
+ * Map errnos to NFS errnos.
+ */
+int
+nfserrno (int errno)
+{
+	static struct {
+		int	nfserr;
+		int	syserr;
+	} nfs_errtbl[] = {
+		{ NFS_OK, 0 },
+		{ NFSERR_PERM, EPERM },
+		{ NFSERR_NOENT, ENOENT },
+		{ NFSERR_IO, EIO },
+		{ NFSERR_NXIO, ENXIO },
+		{ NFSERR_ACCES, EACCES },
+		{ NFSERR_EXIST, EEXIST },
+		{ NFSERR_NODEV, ENODEV },
+		{ NFSERR_NOTDIR, ENOTDIR },
+		{ NFSERR_ISDIR, EISDIR },
+		{ NFSERR_INVAL, EINVAL },
+		{ NFSERR_FBIG, EFBIG },
+		{ NFSERR_NOSPC, ENOSPC },
+		{ NFSERR_ROFS, EROFS },
+		{ NFSERR_NAMETOOLONG, ENAMETOOLONG },
+		{ NFSERR_NOTEMPTY, ENOTEMPTY },
+#ifdef EDQUOT
+		{ NFSERR_DQUOT, EDQUOT },
+#endif
+		{ NFSERR_STALE, ESTALE },
+		{ NFSERR_WFLUSH, EIO },
+		{ -1, EIO }
+	};
+	int	i;
+
+	for (i = 0; nfs_errtbl[i].nfserr != -1; i++) {
+		if (nfs_errtbl[i].syserr == errno)
+			return htonl (nfs_errtbl[i].nfserr);
+	}
+	printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
+	return nfserr_io;
+}
+
+#if 0
+static void
+nfsd3_dump(char *tag, u32 *buf, int len)
+{
+	int	i;
+
+	printk(KERN_NOTICE
+		"nfsd: %s (%d words)\n", tag, len);
+
+	for (i = 0; i < len && i < 32; i += 8)
+		printk(KERN_NOTICE
+			" %08lx %08lx %08lx %08lx"
+			" %08lx %08lx %08lx %08lx\n",
+			buf[i],   buf[i+1], buf[i+2], buf[i+3],
+			buf[i+4], buf[i+5], buf[i+6], buf[i+7]);
+}
+#endif