282 lines
6.9 KiB
C
282 lines
6.9 KiB
C
/*
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* file.c
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*
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* PURPOSE
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* File handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1998-1999 Dave Boynton
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* (C) 1998-2004 Ben Fennema
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* (C) 1999-2000 Stelias Computing Inc
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*
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* HISTORY
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*
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* 10/02/98 dgb Attempt to integrate into udf.o
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* 10/07/98 Switched to using generic_readpage, etc., like isofs
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* And it works!
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* 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
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* ICBTAG_FLAG_AD_IN_ICB.
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* 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
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* 05/12/99 Preliminary file write support
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*/
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#include "udfdecl.h"
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#include <linux/fs.h>
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#include <asm/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/string.h> /* memset */
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/pagemap.h>
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#include <linux/buffer_head.h>
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#include <linux/aio.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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static void __udf_adinicb_readpage(struct page *page)
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{
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struct inode *inode = page->mapping->host;
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char *kaddr;
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struct udf_inode_info *iinfo = UDF_I(inode);
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kaddr = kmap(page);
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memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
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memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size);
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flush_dcache_page(page);
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SetPageUptodate(page);
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kunmap(page);
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}
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static int udf_adinicb_readpage(struct file *file, struct page *page)
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{
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BUG_ON(!PageLocked(page));
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__udf_adinicb_readpage(page);
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unlock_page(page);
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return 0;
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}
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static int udf_adinicb_writepage(struct page *page,
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struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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char *kaddr;
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struct udf_inode_info *iinfo = UDF_I(inode);
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BUG_ON(!PageLocked(page));
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kaddr = kmap(page);
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memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
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mark_inode_dirty(inode);
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SetPageUptodate(page);
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kunmap(page);
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unlock_page(page);
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return 0;
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}
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static int udf_adinicb_write_begin(struct file *file,
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struct address_space *mapping, loff_t pos,
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unsigned len, unsigned flags, struct page **pagep,
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void **fsdata)
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{
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struct page *page;
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if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE))
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return -EIO;
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page = grab_cache_page_write_begin(mapping, 0, flags);
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if (!page)
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return -ENOMEM;
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*pagep = page;
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if (!PageUptodate(page) && len != PAGE_CACHE_SIZE)
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__udf_adinicb_readpage(page);
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return 0;
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}
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static int udf_adinicb_write_end(struct file *file,
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struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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struct inode *inode = mapping->host;
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unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
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char *kaddr;
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struct udf_inode_info *iinfo = UDF_I(inode);
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kaddr = kmap_atomic(page);
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memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
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kaddr + offset, copied);
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kunmap_atomic(kaddr);
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return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
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}
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static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
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const struct iovec *iov,
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loff_t offset, unsigned long nr_segs)
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{
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/* Fallback to buffered I/O. */
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return 0;
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}
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const struct address_space_operations udf_adinicb_aops = {
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.readpage = udf_adinicb_readpage,
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.writepage = udf_adinicb_writepage,
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.write_begin = udf_adinicb_write_begin,
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.write_end = udf_adinicb_write_end,
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.direct_IO = udf_adinicb_direct_IO,
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};
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static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t ppos)
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{
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ssize_t retval;
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_path.dentry->d_inode;
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int err, pos;
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size_t count = iocb->ki_left;
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struct udf_inode_info *iinfo = UDF_I(inode);
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down_write(&iinfo->i_data_sem);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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if (file->f_flags & O_APPEND)
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pos = inode->i_size;
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else
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pos = ppos;
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if (inode->i_sb->s_blocksize <
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(udf_file_entry_alloc_offset(inode) +
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pos + count)) {
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err = udf_expand_file_adinicb(inode);
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if (err) {
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udf_debug("udf_expand_adinicb: err=%d\n", err);
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return err;
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}
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} else {
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if (pos + count > inode->i_size)
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iinfo->i_lenAlloc = pos + count;
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else
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iinfo->i_lenAlloc = inode->i_size;
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up_write(&iinfo->i_data_sem);
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}
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} else
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up_write(&iinfo->i_data_sem);
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retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
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if (retval > 0)
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mark_inode_dirty(inode);
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return retval;
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}
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long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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long old_block, new_block;
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int result = -EINVAL;
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if (inode_permission(inode, MAY_READ) != 0) {
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udf_debug("no permission to access inode %lu\n", inode->i_ino);
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result = -EPERM;
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goto out;
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}
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if (!arg) {
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udf_debug("invalid argument to udf_ioctl\n");
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result = -EINVAL;
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goto out;
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}
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switch (cmd) {
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case UDF_GETVOLIDENT:
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if (copy_to_user((char __user *)arg,
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UDF_SB(inode->i_sb)->s_volume_ident, 32))
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result = -EFAULT;
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else
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result = 0;
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goto out;
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case UDF_RELOCATE_BLOCKS:
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if (!capable(CAP_SYS_ADMIN)) {
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result = -EACCES;
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goto out;
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}
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if (get_user(old_block, (long __user *)arg)) {
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result = -EFAULT;
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goto out;
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}
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result = udf_relocate_blocks(inode->i_sb,
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old_block, &new_block);
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if (result == 0)
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result = put_user(new_block, (long __user *)arg);
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goto out;
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case UDF_GETEASIZE:
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result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
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goto out;
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case UDF_GETEABLOCK:
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result = copy_to_user((char __user *)arg,
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UDF_I(inode)->i_ext.i_data,
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UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
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goto out;
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}
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out:
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return result;
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}
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static int udf_release_file(struct inode *inode, struct file *filp)
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{
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if (filp->f_mode & FMODE_WRITE) {
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down_write(&UDF_I(inode)->i_data_sem);
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udf_discard_prealloc(inode);
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udf_truncate_tail_extent(inode);
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up_write(&UDF_I(inode)->i_data_sem);
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}
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return 0;
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}
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const struct file_operations udf_file_operations = {
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.read = do_sync_read,
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.aio_read = generic_file_aio_read,
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.unlocked_ioctl = udf_ioctl,
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.open = generic_file_open,
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.mmap = generic_file_mmap,
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.write = do_sync_write,
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.aio_write = udf_file_aio_write,
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.release = udf_release_file,
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.fsync = generic_file_fsync,
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.splice_read = generic_file_splice_read,
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.llseek = generic_file_llseek,
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};
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static int udf_setattr(struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = dentry->d_inode;
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int error;
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error = inode_change_ok(inode, attr);
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if (error)
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return error;
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if ((attr->ia_valid & ATTR_SIZE) &&
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attr->ia_size != i_size_read(inode)) {
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error = udf_setsize(inode, attr->ia_size);
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if (error)
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return error;
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}
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setattr_copy(inode, attr);
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mark_inode_dirty(inode);
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return 0;
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}
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const struct inode_operations udf_file_inode_operations = {
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.setattr = udf_setattr,
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};
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