266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
/*
|
|
* file.c
|
|
*
|
|
* PURPOSE
|
|
* File handling routines for the OSTA-UDF(tm) filesystem.
|
|
*
|
|
* 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/capability.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/aio.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;
|
|
struct udf_inode_info *iinfo = UDF_I(inode);
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
kaddr = kmap(page);
|
|
memset(kaddr, 0, PAGE_CACHE_SIZE);
|
|
memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, 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;
|
|
struct udf_inode_info *iinfo = UDF_I(inode);
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
kaddr = kmap(page);
|
|
memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
|
|
mark_inode_dirty(inode);
|
|
SetPageUptodate(page);
|
|
kunmap(page);
|
|
unlock_page(page);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int udf_adinicb_write_end(struct file *file,
|
|
struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
char *kaddr;
|
|
struct udf_inode_info *iinfo = UDF_I(inode);
|
|
|
|
kaddr = kmap_atomic(page, KM_USER0);
|
|
memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
|
|
kaddr + offset, copied);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
|
|
return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
|
|
}
|
|
|
|
const struct address_space_operations udf_adinicb_aops = {
|
|
.readpage = udf_adinicb_readpage,
|
|
.writepage = udf_adinicb_writepage,
|
|
.sync_page = block_sync_page,
|
|
.write_begin = simple_write_begin,
|
|
.write_end = udf_adinicb_write_end,
|
|
};
|
|
|
|
static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t ppos)
|
|
{
|
|
ssize_t retval;
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
int err, pos;
|
|
size_t count = iocb->ki_left;
|
|
struct udf_inode_info *iinfo = UDF_I(inode);
|
|
|
|
if (iinfo->i_alloc_type == 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 (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
|
|
udf_debug("udf_expand_adinicb: err=%d\n", err);
|
|
return err;
|
|
}
|
|
} else {
|
|
if (pos + count > inode->i_size)
|
|
iinfo->i_lenAlloc = pos + count;
|
|
else
|
|
iinfo->i_lenAlloc = inode->i_size;
|
|
}
|
|
}
|
|
|
|
retval = generic_file_aio_write(iocb, iov, nr_segs, 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)
|
|
{
|
|
long old_block, new_block;
|
|
int result = -EINVAL;
|
|
|
|
if (file_permission(filp, MAY_READ) != 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:
|
|
if (copy_to_user((char __user *)arg,
|
|
UDF_SB(inode->i_sb)->s_volume_ident, 32))
|
|
return -EFAULT;
|
|
else
|
|
return 0;
|
|
case UDF_RELOCATE_BLOCKS:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
if (get_user(old_block, (long __user *)arg))
|
|
return -EFAULT;
|
|
result = udf_relocate_blocks(inode->i_sb,
|
|
old_block, &new_block);
|
|
if (result == 0)
|
|
result = put_user(new_block, (long __user *)arg);
|
|
return result;
|
|
case UDF_GETEASIZE:
|
|
result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
|
|
break;
|
|
case UDF_GETEABLOCK:
|
|
result = copy_to_user((char __user *)arg,
|
|
UDF_I(inode)->i_ext.i_data,
|
|
UDF_I(inode)->i_lenEAttr) ? -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;
|
|
}
|
|
|
|
const struct file_operations udf_file_operations = {
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.ioctl = udf_ioctl,
|
|
.open = generic_file_open,
|
|
.mmap = generic_file_mmap,
|
|
.write = do_sync_write,
|
|
.aio_write = udf_file_aio_write,
|
|
.release = udf_release_file,
|
|
.fsync = udf_fsync_file,
|
|
.splice_read = generic_file_splice_read,
|
|
};
|
|
|
|
const struct inode_operations udf_file_inode_operations = {
|
|
.truncate = udf_truncate,
|
|
};
|