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

• Lines: 125
• Date: Fri Apr 4 11:06:02 1997
• Orig file: v2.1.31/linux/fs/nfsd/nfsfh.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/fs/nfsd/nfsfh.c linux/fs/nfsd/nfsfh.c
@@ -0,0 +1,124 @@
+/*
+ * linux/fs/nfsd/nfsfh.c
+ *
+ * NFS server filehandle treatment.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+
+#define NFSDDBG_FACILITY		NFSDDBG_FH
+
+/*
+ * Get the inode version number
+ */
+static inline int
+nfsd_iversion(struct inode *inode)
+{
+	if (inode->i_sb->s_magic == EXT2_SUPER_MAGIC)
+		return inode->u.ext2_i.i_version;
+	return 0;
+}
+
+/*
+ * Get the inode given a file handle.
+ */
+u32
+fh_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
+{
+	struct svc_export *exp;
+	struct inode	*inode;
+	struct knfs_fh	*fh = &fhp->fh_handle;
+
+	/* Already checked */
+	if (fhp->fh_inode)
+		return 0;
+
+	dprintk("nfsd: fh_lookup(exp %x/%ld fh %x/%ld)\n",
+			fh->fh_xdev, fh->fh_xino, fh->fh_dev, fh->fh_ino);
+
+	/* Make sure that clients don't cheat */
+	if (fh->fh_dev != fh->fh_xdev) {
+		printk(KERN_NOTICE "nfsd: fh with bad dev fields "
+				"(%x != %x) from %08lx:%d\n",
+				fh->fh_dev, fh->fh_xdev,
+				ntohl(rqstp->rq_addr.sin_addr.s_addr),
+				ntohs(rqstp->rq_addr.sin_port));
+		return nfserr_perm;
+	}
+
+	/* Look up the export entry */
+	exp = exp_get(rqstp->rq_client, fh->fh_xdev, fh->fh_xino);
+	if (!exp) {
+		/* nfsdstats.fhstale++; */
+		return nfserr_stale; /* export entry revoked */
+	}
+
+	/* Check if the request originated from a secure port. */
+	if (!rqstp->rq_secure && EX_SECURE(exp)) {
+		printk(KERN_WARNING
+			"nfsd: request from insecure port (%08lx:%d)!\n",
+				ntohl(rqstp->rq_addr.sin_addr.s_addr),
+				ntohs(rqstp->rq_addr.sin_port));
+		return nfserr_perm;
+	}
+
+	/* Set user creds if we haven't done so already */
+	nfsd_setuser(rqstp, exp);
+
+	/* Get the inode */
+	if (!(inode = nfsd_iget(fh->fh_dev, fh->fh_ino))
+	 || !inode->i_nlink || fh->fh_version != nfsd_iversion(inode)) {
+		if (inode)
+			iput(inode);
+		/* nfsdstats.fhstale++; */
+		return nfserr_stale;	/* unlinked in the meanwhile */
+	}
+
+	/* This is basically what wait_on_inode does */
+	while (inode->i_lock)
+		sleep_on(&inode->i_wait);
+	fhp->fh_inode  = inode;
+	fhp->fh_export = exp;
+
+	/* Type check. The correct error return for type mismatches
+	 * does not seem to be generally agreed upon. SunOS seems to
+	 * use EISDIR if file isn't S_IFREG; a comment in the NFSv3
+	 * spec says this is incorrect (implementation notes for the
+	 * write call).
+	 */
+	if (type > 0 && (inode->i_mode & S_IFMT) != type)
+		return (type == S_IFDIR)? nfserr_notdir : nfserr_isdir;
+	if (type < 0 && (inode->i_mode & S_IFMT) == -type)
+		return (type == -S_IFDIR)? nfserr_notdir : nfserr_isdir;
+
+	/* Finally, check access permissions */
+	return nfsd_permission(fhp->fh_export, inode, access);
+}
+
+/*
+ * Compose file handle for NFS reply.
+ */
+void
+fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct inode *inode)
+{
+	dprintk("nfsd: fh_compose(exp %x/%ld fh %x/%ld)\n",
+			exp->ex_dev, exp->ex_ino, inode->i_dev, inode->i_ino);
+
+	fh_init(fhp);			/* initialize empty fh */
+	fhp->fh_inode = inode;
+	fhp->fh_export = exp;
+	fhp->fh_handle.fh_dev = inode->i_dev;
+	fhp->fh_handle.fh_ino = inode->i_ino;
+	fhp->fh_handle.fh_xdev = exp->ex_dev;
+	fhp->fh_handle.fh_xino = exp->ex_ino;
+	fhp->fh_handle.fh_version = nfsd_iversion(inode);
+}