patch-2.4.27 linux-2.4.27/fs/xfs/linux-2.4/xfs_file.c

• Lines: 446
• Date: 2004-08-07 16:26:06.077405249 -0700
• Orig file: linux-2.4.26/fs/xfs/linux-2.4/xfs_file.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.26/fs/xfs/linux-2.4/xfs_file.c linux-2.4.27/fs/xfs/linux-2.4/xfs_file.c
@@ -0,0 +1,445 @@
+/*
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_sb.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_trans.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_error.h"
+#include "xfs_rw.h"
+#include <linux/iobuf.h>
+
+#include <linux/dcache.h>
+#include <linux/smp_lock.h>
+#include <linux/mman.h> /* for PROT_WRITE */
+
+static struct vm_operations_struct linvfs_file_vm_ops;
+
+STATIC inline ssize_t
+__linvfs_read(
+	struct file	*file,
+	char		*buf,
+	int		ioflags,
+	size_t		size,
+	loff_t		*offset)
+{
+	struct inode	*inode = file->f_dentry->d_inode;
+	vnode_t		*vp = LINVFS_GET_VP(inode);
+	ssize_t		rval;
+
+	if (unlikely(file->f_flags & O_DIRECT)) {
+		ioflags |= IO_ISDIRECT;
+		down_read(&inode->i_alloc_sem);
+		VOP_READ(vp, file, buf, size, offset, ioflags, NULL, rval);
+		up_read(&inode->i_alloc_sem);
+	} else {
+		VOP_READ(vp, file, buf, size, offset, ioflags, NULL, rval);
+	}
+
+	return rval;
+}
+
+STATIC ssize_t
+linvfs_read(
+	struct file	*file,
+	char		*buf,
+	size_t		size,
+	loff_t		*offset)
+{
+	return __linvfs_read(file, buf, 0, size, offset);
+}
+
+STATIC ssize_t
+linvfs_read_invis(
+	struct file	*file,
+	char		*buf,
+	size_t		size,
+	loff_t		*offset)
+{
+	return __linvfs_read(file, buf, IO_INVIS, size, offset);
+}
+
+
+STATIC inline ssize_t
+__linvfs_write(
+	struct file	*file,
+	const char	*buf,
+	int		ioflags,
+	size_t		count,
+	loff_t		*ppos)
+{
+	struct inode	*inode = file->f_dentry->d_inode;
+	vnode_t		*vp = LINVFS_GET_VP(inode);
+	loff_t		pos;
+	ssize_t		rval;	/* Use negative errors in this f'n */
+
+	if ((ssize_t) count < 0)
+		return -EINVAL;
+
+	if (!access_ok(VERIFY_READ, buf, count))
+		return -EFAULT;
+
+	pos = *ppos;
+	if (pos < 0)
+		return -EINVAL;
+
+	rval = file->f_error;
+	if (rval) {
+		file->f_error = 0;
+		return rval;
+	}
+
+	/* We allow multiple direct writers in, there is no
+	 * potential call to vmtruncate in that path.
+	 */
+	if (unlikely(file->f_flags & O_DIRECT)) {
+		ioflags |= IO_ISDIRECT;
+		down_read(&inode->i_alloc_sem);
+		VOP_WRITE(vp, file, buf, count, &pos, ioflags, NULL, rval);
+		*ppos = pos;
+		up_read(&inode->i_alloc_sem);
+	} else {
+		down(&inode->i_sem);
+		VOP_WRITE(vp, file, buf, count, &pos, ioflags, NULL, rval);
+		*ppos = pos;
+		up(&inode->i_sem);
+	}
+
+	return rval;
+}
+
+STATIC inline ssize_t
+linvfs_write(
+	struct file	*file,
+	const char	*buf,
+	size_t		count,
+	loff_t		*ppos)
+{
+	return __linvfs_write(file, buf, 0, count, ppos);
+}
+
+STATIC inline ssize_t
+linvfs_write_invis(
+	struct file	*file,
+	const char	*buf,
+	size_t		count,
+	loff_t		*ppos)
+{
+	return __linvfs_write(file, buf, IO_INVIS, count, ppos);
+}
+
+STATIC int
+linvfs_open(
+	struct inode	*inode,
+	struct file	*filp)
+{
+	vnode_t		*vp = LINVFS_GET_VP(inode);
+	int		error;
+
+	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
+		return -EFBIG;
+
+	ASSERT(vp);
+	VOP_OPEN(vp, NULL, error);
+	return -error;
+}
+
+
+STATIC int
+linvfs_release(
+	struct inode	*inode,
+	struct file	*filp)
+{
+	vnode_t		*vp = LINVFS_GET_VP(inode);
+	int		error = 0;
+
+	if (vp)
+		VOP_RELEASE(vp, error);
+	return -error;
+}
+
+
+STATIC int
+linvfs_fsync(
+	struct file	*filp,
+	struct dentry	*dentry,
+	int		datasync)
+{
+	struct inode	*inode = dentry->d_inode;
+	vnode_t		*vp = LINVFS_GET_VP(inode);
+	int		error;
+	int		flags = FSYNC_WAIT;
+
+	error = fsync_inode_data_buffers(inode);
+	if (error)
+		return error;
+
+	if (datasync)
+		flags |= FSYNC_DATA;
+
+	ASSERT(vp);
+	VOP_FSYNC(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1, error);
+	return -error;
+}
+
+/*
+ * linvfs_readdir maps to VOP_READDIR().
+ * We need to build a uio, cred, ...
+ */
+
+#define nextdp(dp)      ((struct xfs_dirent *)((char *)(dp) + (dp)->d_reclen))
+
+STATIC int
+linvfs_readdir(
+	struct file	*filp,
+	void		*dirent,
+	filldir_t	filldir)
+{
+	int		error = 0;
+	vnode_t		*vp;
+	uio_t		uio;
+	iovec_t		iov;
+	int		eof = 0;
+	caddr_t		read_buf;
+	int		namelen, size = 0;
+	size_t		rlen = PAGE_CACHE_SIZE;
+	xfs_off_t	start_offset, curr_offset;
+	xfs_dirent_t	*dbp = NULL;
+
+	vp = LINVFS_GET_VP(filp->f_dentry->d_inode);
+	ASSERT(vp);
+
+	/* Try fairly hard to get memory */
+	do {
+		if ((read_buf = (caddr_t)kmalloc(rlen, GFP_KERNEL)))
+			break;
+		rlen >>= 1;
+	} while (rlen >= 1024);
+
+	if (read_buf == NULL)
+		return -ENOMEM;
+
+	uio.uio_iov = &iov;
+	uio.uio_segflg = UIO_SYSSPACE;
+	curr_offset = filp->f_pos;
+	if (filp->f_pos != 0x7fffffff)
+		uio.uio_offset = filp->f_pos;
+	else
+		uio.uio_offset = 0xffffffff;
+
+	while (!eof) {
+		uio.uio_resid = iov.iov_len = rlen;
+		iov.iov_base = read_buf;
+		uio.uio_iovcnt = 1;
+
+		start_offset = uio.uio_offset;
+
+		VOP_READDIR(vp, &uio, NULL, &eof, error);
+		if ((uio.uio_offset == start_offset) || error) {
+			size = 0;
+			break;
+		}
+
+		size = rlen - uio.uio_resid;
+		dbp = (xfs_dirent_t *)read_buf;
+		while (size > 0) {
+			namelen = strlen(dbp->d_name);
+
+			if (filldir(dirent, dbp->d_name, namelen,
+					(loff_t) curr_offset & 0x7fffffff,
+					(ino_t) dbp->d_ino,
+					DT_UNKNOWN)) {
+				goto done;
+			}
+			size -= dbp->d_reclen;
+			curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
+			dbp = nextdp(dbp);
+		}
+	}
+done:
+	if (!error) {
+		if (size == 0)
+			filp->f_pos = uio.uio_offset & 0x7fffffff;
+		else if (dbp)
+			filp->f_pos = curr_offset;
+	}
+
+	kfree(read_buf);
+	return -error;
+}
+
+STATIC int
+linvfs_file_mmap(
+	struct file	*filp,
+	struct vm_area_struct *vma)
+{
+	struct inode	*ip = filp->f_dentry->d_inode;
+	vnode_t		*vp = LINVFS_GET_VP(ip);
+	vattr_t		va = { .va_mask = XFS_AT_UPDATIME };
+	int		error;
+
+	if ((vp->v_type == VREG) && (vp->v_vfsp->vfs_flag & VFS_DMI)) {
+		xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);
+
+		error = -XFS_SEND_MMAP(mp, vma, 0);
+		if (error)
+			return error;
+	}
+
+	vma->vm_ops = &linvfs_file_vm_ops;
+
+	VOP_SETATTR(vp, &va, XFS_AT_UPDATIME, NULL, error);
+	return 0;
+}
+
+
+STATIC int
+linvfs_ioctl(
+	struct inode	*inode,
+	struct file	*filp,
+	unsigned int	cmd,
+	unsigned long	arg)
+{
+	int		error;
+	vnode_t		*vp = LINVFS_GET_VP(inode);
+
+	unlock_kernel();
+	VOP_IOCTL(vp, inode, filp, 0, cmd, arg, error);
+	VMODIFY(vp);
+	lock_kernel();
+
+	/* NOTE:  some of the ioctl's return positive #'s as a
+	 *	  byte count indicating success, such as
+	 *	  readlink_by_handle.  So we don't "sign flip"
+	 *	  like most other routines.  This means true
+	 *	  errors need to be returned as a negative value.
+	 */
+	return error;
+}
+
+STATIC int
+linvfs_ioctl_invis(
+	struct inode	*inode,
+	struct file	*filp,
+	unsigned int	cmd,
+	unsigned long	arg)
+{
+	int		error;
+	vnode_t		*vp = LINVFS_GET_VP(inode);
+
+	unlock_kernel();
+	VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, arg, error);
+	VMODIFY(vp);
+	lock_kernel();
+
+	/* NOTE:  some of the ioctl's return positive #'s as a
+	 *	  byte count indicating success, such as
+	 *	  readlink_by_handle.  So we don't "sign flip"
+	 *	  like most other routines.  This means true
+	 *	  errors need to be returned as a negative value.
+	 */
+	return error;
+}
+
+#ifdef HAVE_VMOP_MPROTECT
+STATIC int
+linvfs_mprotect(
+	struct vm_area_struct *vma,
+	unsigned int	newflags)
+{
+	vnode_t		*vp = LINVFS_GET_VP(vma->vm_file->f_dentry->d_inode);
+	int		error = 0;
+
+	if ((vp->v_type == VREG) && (vp->v_vfsp->vfs_flag & VFS_DMI)) {
+		if ((vma->vm_flags & VM_MAYSHARE) &&
+		    (newflags & PROT_WRITE) && !(vma->vm_flags & PROT_WRITE)) {
+			xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);
+
+			error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
+		    }
+	}
+	return error;
+}
+#endif /* HAVE_VMOP_MPROTECT */
+
+
+struct file_operations linvfs_file_operations = {
+	.llseek		= generic_file_llseek,
+	.read		= linvfs_read,
+	.write		= linvfs_write,
+	.ioctl		= linvfs_ioctl,
+	.mmap		= linvfs_file_mmap,
+	.open		= linvfs_open,
+	.release	= linvfs_release,
+	.fsync		= linvfs_fsync,
+};
+
+struct file_operations linvfs_invis_file_operations = {
+	.llseek		= generic_file_llseek,
+	.read		= linvfs_read_invis,
+	.write		= linvfs_write_invis,
+	.ioctl		= linvfs_ioctl_invis,
+	.mmap		= linvfs_file_mmap,
+	.open		= linvfs_open,
+	.release	= linvfs_release,
+	.fsync		= linvfs_fsync,
+};
+
+
+struct file_operations linvfs_dir_operations = {
+	.read		= generic_read_dir,
+	.readdir	= linvfs_readdir,
+	.ioctl		= linvfs_ioctl,
+	.fsync		= linvfs_fsync,
+};
+
+static struct vm_operations_struct linvfs_file_vm_ops = {
+	.nopage		= filemap_nopage,
+#ifdef HAVE_VMOP_MPROTECT
+	.mprotect	= linvfs_mprotect,
+#endif
+};