patch-2.1.32 linux/fs/nfs/file.c

• Lines: 263
• Date: Fri Apr 4 11:05:59 1997
• Orig file: v2.1.31/linux/fs/nfs/file.c
• Orig date: Sun Jan 26 02:07:44 1997

diff -u --recursive --new-file v2.1.31/linux/fs/nfs/file.c linux/fs/nfs/file.c
@@ -21,30 +21,40 @@
 #include <linux/errno.h>
 #include <linux/fcntl.h>
 #include <linux/stat.h>
-#include <linux/mm.h>
 #include <linux/nfs_fs.h>
+#include <linux/mm.h>
 #include <linux/malloc.h>
 #include <linux/pagemap.h>
+#include <linux/lockd/bind.h>
 
-#include <asm/uaccess.h>
+#include <asm/segment.h>
 #include <asm/system.h>
 
-static int nfs_file_mmap(struct inode *, struct file *, struct vm_area_struct *);
+#define NFSDBG_FACILITY		NFSDBG_FILE
+
+static int  nfs_file_mmap(struct inode *, struct file *,
+					struct vm_area_struct *);
 static long nfs_file_read(struct inode *, struct file *, char *, unsigned long);
-static long nfs_file_write(struct inode *, struct file *, const char *, unsigned long);
-static int nfs_fsync(struct inode *, struct file *);
+static long nfs_file_write(struct inode *, struct file *,
+					const char *, unsigned long);
+static int  nfs_file_close(struct inode *, struct file *);
+static int  nfs_fsync(struct inode *, struct file *);
 
 static struct file_operations nfs_file_operations = {
 	NULL,			/* lseek - default */
 	nfs_file_read,		/* read */
 	nfs_file_write,		/* write */
 	NULL,			/* readdir - bad */
-	NULL,			/* poll - default */
+	NULL,			/* select - default */
 	NULL,			/* ioctl - default */
 	nfs_file_mmap,		/* mmap */
 	NULL,			/* no special open is needed */
-	NULL,			/* release */
+	nfs_file_close,		/* release */
 	nfs_fsync,		/* fsync */
+	NULL,			/* fasync */
+	NULL,			/* check_media_change */
+	NULL,			/* revalidate */
+	nfs_lock,		/* lock */
 };
 
 struct inode_operations nfs_file_inode_operations = {
@@ -61,97 +71,156 @@
 	NULL,			/* readlink */
 	NULL,			/* follow_link */
 	nfs_readpage,		/* readpage */
-	NULL,			/* writepage */
+	nfs_writepage,		/* writepage */
 	NULL,			/* bmap */
-	NULL			/* truncate */
+	NULL,			/* truncate */
+	NULL,			/* permission */
+	NULL,			/* smap */
+	nfs_updatepage,		/* updatepage */
+	nfs_revalidate,		/* revalidate */
 };
 
-static inline void revalidate_inode(struct nfs_server * server, struct inode * inode)
+/* Hack for future NFS swap support */
+#ifndef IS_SWAPFILE
+# define IS_SWAPFILE(inode)	(0)
+#endif
+
+
+static int
+nfs_file_close(struct inode *inode, struct file *file)
 {
-	struct nfs_fattr fattr;
+	int	status;
 
-	if (jiffies - NFS_READTIME(inode) < NFS_ATTRTIMEO(inode))
-		return;
+	dfprintk(VFS, "nfs: close(%x/%ld)\n", inode->i_dev, inode->i_ino);
 
-	NFS_READTIME(inode) = jiffies;
-	if (nfs_proc_getattr(server, NFS_FH(inode), &fattr) == 0) {
-		nfs_refresh_inode(inode, &fattr);
-		if (fattr.mtime.seconds == NFS_OLDMTIME(inode)) {
-			if ((NFS_ATTRTIMEO(inode) <<= 1) > server->acregmax)
-				NFS_ATTRTIMEO(inode) = server->acregmax;
-			return;
-		}
-		NFS_OLDMTIME(inode) = fattr.mtime.seconds;
-	}
-	invalidate_inode_pages(inode);
+	if ((status = nfs_flush_dirty_pages(inode, 0, 0)) < 0)
+		return status;
+	return nfs_write_error(inode);
 }
 
-
-static long nfs_file_read(struct inode * inode, struct file * file,
-	char * buf, unsigned long count)
+static long
+nfs_file_read(struct inode * inode, struct file * file,
+				char * buf, unsigned long count)
 {
-	revalidate_inode(NFS_SERVER(inode), inode);
+	int	status;
+
+	dfprintk(VFS, "nfs: read(%x/%ld, %lu@%lu)\n",
+			inode->i_dev, inode->i_ino, count,
+			(unsigned long) file->f_pos);
+
+	if ((status = nfs_revalidate_inode(NFS_SERVER(inode), inode)) < 0)
+		return status;
 	return generic_file_read(inode, file, buf, count);
 }
 
-static int nfs_file_mmap(struct inode * inode, struct file * file, struct vm_area_struct * vma)
+static int
+nfs_file_mmap(struct inode * inode, struct file * file,
+				struct vm_area_struct * vma)
 {
-	revalidate_inode(NFS_SERVER(inode), inode);
+	int	status;
+
+	dfprintk(VFS, "nfs: mmap(%x/%ld)\n", inode->i_dev, inode->i_ino);
+
+	if ((status = nfs_revalidate_inode(NFS_SERVER(inode), inode)) < 0)
+		return status;
 	return generic_file_mmap(inode, file, vma);
 }
 
 static int nfs_fsync(struct inode *inode, struct file *file)
 {
-	return 0;
+	dfprintk(VFS, "nfs: fsync(%x/%ld)\n", inode->i_dev, inode->i_ino);
+
+	return nfs_flush_dirty_pages(inode, 0, 0);
 }
 
-static long nfs_file_write(struct inode *inode, struct file *file,
-	const char *buf, unsigned long count)
+/* 
+ * Write to a file (through the page cache).
+ */
+static long
+nfs_file_write(struct inode *inode, struct file *file,
+			const char *buf, unsigned long count)
 {
-	int result, written, wsize;
-	struct nfs_fattr fattr;
-	unsigned long pos;
+	int	result;
+
+	dfprintk(VFS, "nfs: write(%x/%ld (%d), %lu@%lu)\n",
+			inode->i_dev, inode->i_ino, inode->i_count,
+			count, (unsigned long) file->f_pos);
 
 	if (!inode) {
 		printk("nfs_file_write: inode = NULL\n");
 		return -EINVAL;
 	}
+	if (IS_SWAPFILE(inode)) {
+		printk("NFS: attempt to write to active swap file!\n");
+		return -EBUSY;
+	}
+	if ((result = nfs_revalidate_inode(NFS_SERVER(inode), inode)) < 0)
+		return result;
 	if (!S_ISREG(inode->i_mode)) {
 		printk("nfs_file_write: write to non-file, mode %07o\n",
 			inode->i_mode);
 		return -EINVAL;
 	}
-	if (count == 0)
+	if (count <= 0)
 		return 0;
 
-	pos = file->f_pos;
-	if (file->f_flags & O_APPEND)
-		pos = inode->i_size;
-	wsize = NFS_SERVER(inode)->wsize;
-	result = 0;
-	written = 0;
-	while (written < count) {
-		int hunk = count - written;
-		if (hunk >= wsize)
-			hunk = wsize;
-		result = nfs_proc_write(inode,
-			pos, hunk, buf, &fattr);
-		if (result < 0)
-			break;
-		pos += hunk;
-		buf += hunk;
-		written += hunk;
-		if (hunk < wsize)
-			break;
-	}
-	if (!written)
+	/* Return error from previous async call */
+	if ((result = nfs_write_error(inode)) < 0)
 		return result;
-	file->f_pos = pos;
-	if (pos > inode->i_size)
-		inode->i_size = pos;
-	/* Avoid possible Solaris 2.5 nfsd bug */
-	if (inode->i_ino == fattr.fileid)
-		nfs_refresh_inode(inode, &fattr);
-	return written;
+
+	return generic_file_write(inode, file, buf, count);
 }
 
+/*
+ * Lock a (portion of) a file
+ */
+int
+nfs_lock(struct inode *inode, struct file *filp, int cmd, struct file_lock *fl)
+{
+	int	status;
+
+	dprintk("NFS: nfs_lock(f=%4x/%ld, t=%x, fl=%x, r=%ld:%ld)\n",
+			filp->f_inode->i_dev, filp->f_inode->i_ino,
+			fl->fl_type, fl->fl_flags,
+			fl->fl_start, fl->fl_end);
+
+	if (!(inode = filp->f_inode))
+		return -EINVAL;
+
+	/* No mandatory locks over NFS */
+	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+		return -ENOLCK;
+
+	/* Fake OK code if mounted without NLM support */
+	if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)
+		return 0;
+
+	/*
+	 * No BSD flocks over NFS allowed.
+	 * Note: we could try to fake a POSIX lock request here by
+	 * using ((u32) filp | 0x80000000) or some such as the pid.
+	 * Not sure whether that would be unique, though, or whether
+	 * that would break in other places.
+	 */
+	if (!fl->fl_owner || (fl->fl_flags & (FL_POSIX|FL_BROKEN)) != FL_POSIX)
+		return -ENOLCK;
+
+	/* If unlocking a file region, flush dirty pages (unless we've
+	 * been killed by a signal, that is). */
+	if (cmd == F_SETLK && fl->fl_type == F_UNLCK
+	 && !(current->signal & ~current->blocked)) {
+		status = nfs_flush_dirty_pages(inode,
+			fl->fl_start, fl->fl_end == NLM_OFFSET_MAX? 0 :
+			fl->fl_end - fl->fl_start + 1);
+		if (status < 0)
+			return status;
+	}
+
+	if ((status = nlmclnt_proc(inode, cmd, fl)) < 0)
+		return status;
+
+	/* Here, we could turn off write-back of pages in the
+	 * locked file region */
+
+	return 0;
+}