1 files changed, 270 insertions, 0 deletions
diff --git a/fs/udf/file.c b/fs/udf/file.c
new file mode 100644
index 000000000000..2faa4172b9f7
--- /dev/null
+++ b/fs/udf/file.c
@@ -0,0 +1,270 @@
+/*
+ * file.c
+ *
+ * PURPOSE
+ *  File handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * CONTACTS
+ *  E-mail regarding any portion of the Linux UDF file system should be
+ *  directed to the development team mailing list (run by majordomo):
+ *    linux_udf@hpesjro.fc.hp.com
+ *
+ * COPYRIGHT
+ *  This file is distributed under the terms of the GNU General Public
+ *  License (GPL). Copies of the GPL can be obtained from:
+ *    ftp://prep.ai.mit.edu/pub/gnu/GPL
+ *  Each contributing author retains all rights to their own work.
+ *
+ *  (C) 1998-1999 Dave Boynton
+ *  (C) 1998-2004 Ben Fennema
+ *  (C) 1999-2000 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ *  10/02/98 dgb  Attempt to integrate into udf.o
+ *  10/07/98      Switched to using generic_readpage, etc., like isofs
+ *                And it works!
+ *  12/06/98 blf  Added udf_file_read. uses generic_file_read for all cases but
+ *                ICBTAG_FLAG_AD_IN_ICB.
+ *  04/06/99      64 bit file handling on 32 bit systems taken from ext2 file.c
+ *  05/12/99      Preliminary file write support
+ */
+
+#include "udfdecl.h"
+#include <linux/fs.h>
+#include <linux/udf_fs.h>
+#include <asm/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/string.h> /* memset */
+#include <linux/errno.h>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+
+#include "udf_i.h"
+#include "udf_sb.h"
+
+static int udf_adinicb_readpage(struct file *file, struct page * page)
+{
+	struct inode *inode = page->mapping->host;
+	char *kaddr;
+
+	if (!PageLocked(page))
+		PAGE_BUG(page);
+
+	kaddr = kmap(page);
+	memset(kaddr, 0, PAGE_CACHE_SIZE);
+	memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
+	flush_dcache_page(page);
+	SetPageUptodate(page);
+	kunmap(page);
+	unlock_page(page);
+	return 0;
+}
+
+static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc)
+{
+	struct inode *inode = page->mapping->host;
+	char *kaddr;
+
+	if (!PageLocked(page))
+		PAGE_BUG(page);
+
+	kaddr = kmap(page);
+	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
+	mark_inode_dirty(inode);
+	SetPageUptodate(page);
+	kunmap(page);
+	unlock_page(page);
+	return 0;
+}
+
+static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
+{
+	kmap(page);
+	return 0;
+}
+
+static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
+{
+	struct inode *inode = page->mapping->host;
+	char *kaddr = page_address(page);
+
+	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
+		kaddr + offset, to - offset);
+	mark_inode_dirty(inode);
+	SetPageUptodate(page);
+	kunmap(page);
+	/* only one page here */
+	if (to > inode->i_size)
+		inode->i_size = to;
+	return 0;
+}
+
+struct address_space_operations udf_adinicb_aops = {
+	.readpage		= udf_adinicb_readpage,
+	.writepage		= udf_adinicb_writepage,
+	.sync_page		= block_sync_page,
+	.prepare_write		= udf_adinicb_prepare_write,
+	.commit_write		= udf_adinicb_commit_write,
+};
+
+static ssize_t udf_file_write(struct file * file, const char __user * buf,
+	size_t count, loff_t *ppos)
+{
+	ssize_t retval;
+	struct inode *inode = file->f_dentry->d_inode;
+	int err, pos;
+
+	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
+	{
+		if (file->f_flags & O_APPEND)
+			pos = inode->i_size;
+		else
+			pos = *ppos;
+
+		if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
+			pos + count))
+		{
+			udf_expand_file_adinicb(inode, pos + count, &err);
+			if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
+			{
+				udf_debug("udf_expand_adinicb: err=%d\n", err);
+				return err;
+			}
+		}
+		else
+		{
+			if (pos + count > inode->i_size)
+				UDF_I_LENALLOC(inode) = pos + count;
+			else
+				UDF_I_LENALLOC(inode) = inode->i_size;
+		}
+	}
+
+	retval = generic_file_write(file, buf, count, ppos);
+
+	if (retval > 0)
+		mark_inode_dirty(inode);
+	return retval;
+}
+
+/*
+ * udf_ioctl
+ *
+ * PURPOSE
+ *	Issue an ioctl.
+ *
+ * DESCRIPTION
+ *	Optional - sys_ioctl() will return -ENOTTY if this routine is not
+ *	available, and the ioctl cannot be handled without filesystem help.
+ *
+ *	sys_ioctl() handles these ioctls that apply only to regular files:
+ *		FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
+ *	These ioctls are also handled by sys_ioctl():
+ *		FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
+ *	All other ioctls are passed to the filesystem.
+ *
+ *	Refer to sys_ioctl() in fs/ioctl.c
+ *	sys_ioctl() -> .
+ *
+ * PRE-CONDITIONS
+ *	inode			Pointer to inode that ioctl was issued on.
+ *	filp			Pointer to file that ioctl was issued on.
+ *	cmd			The ioctl command.
+ *	arg			The ioctl argument [can be interpreted as a
+ *				user-space pointer if desired].
+ *
+ * POST-CONDITIONS
+ *	<return>		Success (>=0) or an error code (<=0) that
+ *				sys_ioctl() will return.
+ *
+ * HISTORY
+ *	July 1, 1997 - Andrew E. Mileski
+ *	Written, tested, and released.
+ */
+int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+	unsigned long arg)
+{
+	int result = -EINVAL;
+
+	if ( permission(inode, MAY_READ, NULL) != 0 )
+	{
+		udf_debug("no permission to access inode %lu\n",
+						inode->i_ino);
+		return -EPERM;
+	}
+
+	if ( !arg )
+	{
+		udf_debug("invalid argument to udf_ioctl\n");
+		return -EINVAL;
+	}
+
+	switch (cmd)
+	{
+		case UDF_GETVOLIDENT:
+			return copy_to_user((char __user *)arg,
+				UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
+		case UDF_RELOCATE_BLOCKS:
+		{
+			long old, new;
+
+			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+			if (get_user(old, (long __user *)arg)) return -EFAULT;
+			if ((result = udf_relocate_blocks(inode->i_sb,
+					old, &new)) == 0)
+				result = put_user(new, (long __user *)arg);
+
+			return result;
+		}
+		case UDF_GETEASIZE:
+			result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
+			break;
+
+		case UDF_GETEABLOCK:
+			result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
+				UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
+			break;
+	}
+
+	return result;
+}
+
+/*
+ * udf_release_file
+ *
+ * PURPOSE
+ *  Called when all references to the file are closed
+ *
+ * DESCRIPTION
+ *  Discard prealloced blocks
+ *
+ * HISTORY
+ *
+ */
+static int udf_release_file(struct inode * inode, struct file * filp)
+{
+	if (filp->f_mode & FMODE_WRITE)
+	{
+		lock_kernel();
+		udf_discard_prealloc(inode);
+		unlock_kernel();
+	}
+	return 0;
+}
+
+struct file_operations udf_file_operations = {
+	.read			= generic_file_read,
+	.ioctl			= udf_ioctl,
+	.open			= generic_file_open,
+	.mmap			= generic_file_mmap,
+	.write			= udf_file_write,
+	.release		= udf_release_file,
+	.fsync			= udf_fsync_file,
+	.sendfile		= generic_file_sendfile,
+};
+
+struct inode_operations udf_file_inode_operations = {
+	.truncate		= udf_truncate,
+};