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

• Lines: 582
• Date: Fri Apr 4 11:06:02 1997
• Orig file: v2.1.31/linux/fs/nfsd/nfsproc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/fs/nfsd/nfsproc.c linux/fs/nfsd/nfsproc.c
@@ -0,0 +1,581 @@
+/*
+ * nfsproc2.c	Process version 2 NFS requests.
+ *
+ * Copyright (C) 1995 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/xdr.h>
+
+typedef struct svc_rqst	svc_rqst;
+typedef struct svc_buf	svc_buf;
+
+#define NFSDDBG_FACILITY		NFSDDBG_PROC
+
+#define sleep(msec)		\
+	{	printk(KERN_NOTICE "nfsd: sleeping %d msecs\n", msec); \
+		current->state = TASK_INTERRUPTIBLE;	\
+		current->timeout = jiffies + msec / 10;	\
+		schedule();	\
+	}
+#define RETURN(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
+nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
+{
+	RETURN(nfs_ok);
+}
+
+/*
+ * Get a file's attributes
+ */
+static int
+nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
+					  struct nfsd_attrstat *resp)
+{
+	dprintk("nfsd: GETATTR  %x/%ld\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh));
+
+	fh_copy(&resp->fh, &argp->fh);
+	RETURN(fh_lookup(rqstp, &resp->fh, 0, MAY_NOP));
+}
+
+/*
+ * Set a file's attributes
+ */
+static int
+nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
+					  struct nfsd_attrstat  *resp)
+{
+	dprintk("nfsd: SETATTR  %x/%ld\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh));
+
+	fh_copy(&resp->fh, &argp->fh);
+	RETURN(nfsd_setattr(rqstp, &resp->fh, &argp->attrs));
+}
+
+/*
+ * Look up a path name component
+ */
+static int
+nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
+					 struct nfsd_diropres  *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: LOOKUP   %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	nfserr = nfsd_lookup(rqstp, &argp->fh,
+				    argp->name,
+				    argp->len,
+				    &resp->fh);
+
+	fh_put(&argp->fh);
+	RETURN(nfserr);
+}
+
+/*
+ * Read a symlink.
+ */
+static int
+nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_fhandle     *argp,
+					   struct nfsd_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 and path length */
+	svcbuf_reserve(&rqstp->rq_resbuf, &path, &dummy, 2);
+
+	/* Read the symlink. */
+	resp->len = NFS_MAXPATHLEN;
+	nfserr = nfsd_readlink(rqstp, &argp->fh, (char *) path, &resp->len);
+
+	fh_put(&argp->fh);
+	RETURN(nfserr);
+}
+
+/*
+ * Read a portion of a file.
+ */
+static int
+nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
+				       struct nfsd_readres  *resp)
+{
+	u32 *	buffer;
+	int	nfserr, avail;
+
+	dprintk("nfsd: READ %x/%ld %d bytes at %d\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->count, argp->offset);
+
+	/* Obtain buffer pointer for payload. 19 is 1 word for
+	 * status, 17 words for fattr, and 1 word for the byte count.
+	 */
+	svcbuf_reserve(&rqstp->rq_resbuf, &buffer, &avail, 19);
+
+	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;
+	nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
+				  argp->offset,
+				  (char *) buffer,
+				  &resp->count);
+
+	RETURN(nfserr);
+}
+
+/*
+ * Write data to a file
+ */
+static int
+nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
+					struct nfsd_attrstat  *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: WRITE    %x/%ld %d bytes at %d\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->len, argp->offset);
+
+	nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
+				   argp->offset,
+				   argp->data,
+				   argp->len,
+				   0);
+	RETURN(nfserr);
+}
+
+/*
+ * CREATE processing is complicated. The keyword here is `overloaded.'
+ * There's a small race condition here between the check for existence
+ * and the actual create() call, but one could even consider this a
+ * feature because this only happens if someone else creates the file
+ * at the same time.
+ */
+static int
+nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
+					 struct nfsd_diropres   *resp)
+{
+	struct inode	*dirp, *inode = NULL;
+	struct iattr	*attr;
+	svc_fh		*dirfhp, *newfhp = NULL;
+	int		nfserr, type, mode;
+	int		rdonly = 0, exists;
+	dev_t		rdev = NODEV;
+
+	dprintk("nfsd: CREATE   %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	dirfhp = &argp->fh;
+	newfhp = &resp->fh;
+	attr = &argp->attrs;
+
+	/* Get the directory inode */
+	nfserr = fh_lookup(rqstp, dirfhp, S_IFDIR, MAY_EXEC);
+	if (nfserr)
+		RETURN(nfserr);
+	dirp = dirfhp->fh_inode;
+
+	/* Check for MAY_WRITE separately. */
+	nfserr = nfsd_permission(dirfhp->fh_export, dirp, MAY_WRITE);
+	if (nfserr == nfserr_rofs) {
+		rdonly = 1;	/* Non-fatal error for echo > /dev/null */
+	} else if (nfserr) {
+		fh_put(dirfhp);
+		RETURN(nfserr);
+	}
+
+	/* First, check if the file already exists.  */
+	exists = !nfsd_lookup(rqstp, dirfhp, argp->name, argp->len, newfhp);
+	inode = newfhp->fh_inode;
+
+	/* Unfudge the mode bits */
+	if (attr->ia_valid & ATTR_MODE) { 
+		type = attr->ia_mode & S_IFMT;
+		mode = attr->ia_mode & ~S_IFMT;
+		if (!type)	/* HP weirdness */
+			type = S_IFREG;
+	} else if (exists) {
+		type = inode->i_mode & S_IFMT;
+		mode = inode->i_mode & ~S_IFMT;
+	} else {
+		type = S_IFREG;
+		mode = 0;	/* ??? */
+	}
+
+	/* This is for "echo > /dev/null" a la SunOS. Argh. */
+	if (rdonly && (!exists || type == S_IFREG)) {
+		nfserr = nfserr_rofs;
+		goto done;
+	}
+
+	attr->ia_valid |= ATTR_MODE;
+	attr->ia_mode = type | mode;
+
+	/* Special treatment for non-regular files according to the
+	 * gospel of sun micro
+	 */
+	nfserr = 0;
+	if (type != S_IFREG) {
+		int	is_borc = 0;
+		u32	size = attr->ia_size;
+
+		rdev = (dev_t) size;
+		if (type != S_IFBLK && type != S_IFCHR) {
+			rdev = 0;
+		} else if (type == S_IFCHR && size == ~(u32) 0) {
+			/* If you think you've seen the worst, grok this. */
+			attr->ia_mode = S_IFIFO | mode;
+			type = S_IFIFO;
+		} else if (size != rdev) {
+			/* dev got truncated because of 16bit Linux dev_t */
+			nfserr = nfserr_io;	/* or nfserr_inval? */
+			goto done;
+		} else {
+			/* Okay, char or block special */
+			is_borc = 1;
+		}
+
+		/* Make sure the type and device matches */
+		if (exists && (type != (inode->i_mode & S_IFMT)
+		 || (is_borc && inode->i_rdev != rdev))) {
+			nfserr = nfserr_exist;
+			goto done;
+		}
+	}
+	
+	if (!exists) {
+		/* File doesn't exist. Create it and set attrs */
+		nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
+					attr, type, rdev, newfhp);
+	} else if (type == S_IFREG) {
+		/* File already exists. We ignore all attributes except
+		 * size, so that creat() behaves exactly like
+		 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
+		 */
+		if ((attr->ia_valid &= ~(ATTR_SIZE)) != 0)
+			nfserr = nfsd_setattr(rqstp, newfhp, attr);
+	}
+
+done:
+	fh_put(dirfhp);
+	RETURN(nfserr);
+}
+
+static int
+nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
+					 void		       *resp)
+{
+	int	nfserr;
+
+	dprintk("nfsd: REMOVE   %x/%ld %s\n",
+				SVCFH_DEV(&argp->fh),
+				SVCFH_INO(&argp->fh),
+				argp->name);
+
+	/* Unlink. -SIFDIR means file must not be a directory */
+	nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
+	fh_put(&argp->fh);
+	RETURN(nfserr);
+}
+
+static int
+nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_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
+nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_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
+nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_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);
+
+	/*
+	 * 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
+nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
+					struct nfsd_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
+nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_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
+nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
+					  struct nfsd_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
+nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
+					  struct nfsd_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 nfsd_proc_none		NULL
+#define nfssvc_release_none	NULL
+struct nfsd_void { int dummy; };
+
+#define PROC(name, argt, rest, relt, cache)	\
+ { (svc_procfunc) nfsd_proc_##name,	\
+   (kxdrproc_t) nfssvc_decode_##argt,	\
+   (kxdrproc_t) nfssvc_encode_##rest,	\
+   (kxdrproc_t) nfssvc_release_##relt,	\
+   sizeof(struct nfsd_##argt),		\
+   sizeof(struct nfsd_##rest),		\
+   0,					\
+   cache				\
+ }
+struct svc_procedure		nfsd_procedures2[18] = {
+  PROC(null,	 void,		void,		none,	 RC_NOCACHE),
+  PROC(getattr,	 fhandle,	attrstat,	fhandle, RC_NOCACHE),
+  PROC(setattr,  sattrargs,	attrstat,	fhandle, RC_REPLBUFF),
+  PROC(none,	 void,		void,		none,	 RC_NOCACHE),
+  PROC(lookup,	 diropargs,	diropres,	fhandle, RC_NOCACHE),
+  PROC(readlink, fhandle,	readlinkres,	none,	 RC_NOCACHE),
+  PROC(read,	 readargs,	readres,	fhandle, RC_NOCACHE),
+  PROC(none,	 void,		void,		none,	 RC_NOCACHE),
+  PROC(write,	 writeargs,	attrstat,	fhandle, RC_REPLBUFF),
+  PROC(create,	 createargs,	diropres,	fhandle, RC_REPLBUFF),
+  PROC(remove,	 diropargs,	void,		none,	 RC_REPLSTAT),
+  PROC(rename,	 renameargs,	void,		none,	 RC_REPLSTAT),
+  PROC(link,	 linkargs,	void,		none,	 RC_REPLSTAT),
+  PROC(symlink,	 symlinkargs,	void,		none,	 RC_REPLSTAT),
+  PROC(mkdir,	 createargs,	diropres,	fhandle, RC_REPLBUFF),
+  PROC(rmdir,	 diropargs,	void,		none,	 RC_REPLSTAT),
+  PROC(readdir,	 readdirargs,	readdirres,	none,	 RC_REPLSTAT),
+  PROC(statfs,	 fhandle,	statfsres,	none,	 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
+nfsd_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