2005-04-16 22:20:36 +00:00
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/*
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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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2014-06-18 17:38:24 +00:00
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#include <linux/uaccess.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/kernel.h>
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2007-07-21 11:37:18 +00:00
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#include <linux/string.h> /* memset */
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2006-01-11 20:17:46 +00:00
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#include <linux/capability.h>
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2005-04-16 22:20:36 +00:00
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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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2015-02-22 16:58:50 +00:00
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#include <linux/uio.h>
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2005-04-16 22:20:36 +00:00
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#include "udf_i.h"
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#include "udf_sb.h"
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2012-09-05 13:48:23 +00:00
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static void __udf_adinicb_readpage(struct page *page)
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2005-04-16 22:20:36 +00:00
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{
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struct inode *inode = page->mapping->host;
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char *kaddr;
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2008-02-08 12:20:44 +00:00
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struct udf_inode_info *iinfo = UDF_I(inode);
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2005-04-16 22:20:36 +00:00
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kaddr = kmap(page);
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2008-02-08 12:20:44 +00:00
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memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
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2012-09-05 13:48:23 +00:00
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memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size);
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2005-04-16 22:20:36 +00:00
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flush_dcache_page(page);
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SetPageUptodate(page);
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kunmap(page);
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2012-09-05 13:48:23 +00:00
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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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2005-04-16 22:20:36 +00:00
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unlock_page(page);
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2007-07-21 11:37:18 +00:00
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2005-04-16 22:20:36 +00:00
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return 0;
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}
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2008-02-08 12:20:36 +00:00
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static int udf_adinicb_writepage(struct page *page,
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struct writeback_control *wbc)
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2005-04-16 22:20:36 +00:00
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{
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struct inode *inode = page->mapping->host;
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char *kaddr;
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2008-02-08 12:20:44 +00:00
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struct udf_inode_info *iinfo = UDF_I(inode);
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2005-04-16 22:20:36 +00:00
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2005-05-01 15:59:01 +00:00
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BUG_ON(!PageLocked(page));
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2005-04-16 22:20:36 +00:00
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kaddr = kmap(page);
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2008-02-08 12:20:44 +00:00
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memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
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2005-04-16 22:20:36 +00:00
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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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2007-07-21 11:37:18 +00:00
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2005-04-16 22:20:36 +00:00
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return 0;
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}
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2012-09-05 13:48:23 +00:00
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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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2015-03-16 11:33:53 +00:00
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static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
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2014-03-05 02:27:34 +00:00
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loff_t offset)
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2012-09-05 16:44:31 +00:00
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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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2006-06-28 11:26:44 +00:00
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const struct address_space_operations udf_adinicb_aops = {
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2007-07-21 11:37:18 +00:00
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.readpage = udf_adinicb_readpage,
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.writepage = udf_adinicb_writepage,
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2012-09-05 13:48:23 +00:00
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.write_begin = udf_adinicb_write_begin,
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2014-07-15 01:38:51 +00:00
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.write_end = simple_write_end,
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2012-09-05 16:44:31 +00:00
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.direct_IO = udf_adinicb_direct_IO,
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2005-04-16 22:20:36 +00:00
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};
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2014-04-03 07:31:17 +00:00
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static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
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2005-04-16 22:20:36 +00:00
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{
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ssize_t retval;
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2006-10-01 06:28:48 +00:00
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struct file *file = iocb->ki_filp;
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2013-01-23 22:07:38 +00:00
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struct inode *inode = file_inode(file);
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2008-02-08 12:20:44 +00:00
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struct udf_inode_info *iinfo = UDF_I(inode);
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2015-04-07 19:26:36 +00:00
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int err;
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2005-04-16 22:20:36 +00:00
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2014-02-18 11:00:21 +00:00
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mutex_lock(&inode->i_mutex);
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2015-04-07 19:26:36 +00:00
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2015-04-09 16:55:47 +00:00
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retval = generic_write_checks(iocb, from);
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if (retval <= 0)
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2015-04-07 19:26:36 +00:00
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goto out;
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2010-11-16 13:33:48 +00:00
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down_write(&iinfo->i_data_sem);
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2008-02-08 12:20:44 +00:00
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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2015-04-07 19:26:36 +00:00
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loff_t end = iocb->ki_pos + iov_iter_count(from);
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2005-04-16 22:20:36 +00:00
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2008-02-08 12:20:36 +00:00
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if (inode->i_sb->s_blocksize <
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2015-04-07 19:26:36 +00:00
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(udf_file_entry_alloc_offset(inode) + end)) {
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2010-10-21 22:30:26 +00:00
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err = udf_expand_file_adinicb(inode);
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if (err) {
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2014-02-18 11:00:21 +00:00
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mutex_unlock(&inode->i_mutex);
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2005-04-16 22:20:36 +00:00
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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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2007-07-19 08:47:43 +00:00
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} else {
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2015-04-07 19:26:36 +00:00
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iinfo->i_lenAlloc = max(end, inode->i_size);
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2011-12-10 01:30:48 +00:00
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up_write(&iinfo->i_data_sem);
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2005-04-16 22:20:36 +00:00
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}
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2011-12-10 01:30:48 +00:00
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} else
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up_write(&iinfo->i_data_sem);
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2005-04-16 22:20:36 +00:00
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2014-04-03 07:31:17 +00:00
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retval = __generic_file_write_iter(iocb, from);
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2015-04-07 15:28:12 +00:00
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out:
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2014-02-18 11:00:21 +00:00
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mutex_unlock(&inode->i_mutex);
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if (retval > 0) {
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ssize_t err;
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2005-04-16 22:20:36 +00:00
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mark_inode_dirty(inode);
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2014-02-18 11:00:21 +00:00
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err = generic_write_sync(file, iocb->ki_pos - retval, retval);
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if (err < 0)
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retval = err;
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}
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2007-07-21 11:37:18 +00:00
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2005-04-16 22:20:36 +00:00
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return retval;
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}
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2010-05-05 13:15:39 +00:00
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long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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2005-04-16 22:20:36 +00:00
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{
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2013-01-23 22:07:38 +00:00
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struct inode *inode = file_inode(filp);
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2007-07-21 11:37:18 +00:00
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long old_block, new_block;
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2005-04-16 22:20:36 +00:00
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int result = -EINVAL;
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2011-06-19 15:49:08 +00:00
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if (inode_permission(inode, MAY_READ) != 0) {
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2010-05-05 13:15:39 +00:00
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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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2005-04-16 22:20:36 +00:00
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}
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2007-07-19 08:47:43 +00:00
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if (!arg) {
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2005-04-16 22:20:36 +00:00
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udf_debug("invalid argument to udf_ioctl\n");
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2010-05-05 13:15:39 +00:00
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result = -EINVAL;
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goto out;
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2005-04-16 22:20:36 +00:00
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}
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2007-07-19 08:47:43 +00:00
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switch (cmd) {
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case UDF_GETVOLIDENT:
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2008-02-08 12:20:36 +00:00
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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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2010-05-05 13:15:39 +00:00
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result = -EFAULT;
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2008-02-08 12:20:36 +00:00
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else
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2010-05-05 13:15:39 +00:00
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result = 0;
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goto out;
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2007-07-19 08:47:43 +00:00
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case UDF_RELOCATE_BLOCKS:
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2010-05-05 13:15:39 +00:00
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if (!capable(CAP_SYS_ADMIN)) {
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2013-02-20 02:13:55 +00:00
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result = -EPERM;
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2010-05-05 13:15:39 +00:00
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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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2008-02-08 12:20:36 +00:00
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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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2007-07-21 11:37:18 +00:00
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result = put_user(new_block, (long __user *)arg);
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2010-05-05 13:15:39 +00:00
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goto out;
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2007-07-19 08:47:43 +00:00
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case UDF_GETEASIZE:
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2008-02-08 12:20:42 +00:00
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result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
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2010-05-05 13:15:39 +00:00
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goto out;
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2007-07-19 08:47:43 +00:00
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case UDF_GETEABLOCK:
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2008-02-08 12:20:42 +00:00
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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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2010-05-05 13:15:39 +00:00
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goto out;
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2005-04-16 22:20:36 +00:00
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}
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2010-05-05 13:15:39 +00:00
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out:
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2005-04-16 22:20:36 +00:00
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return result;
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}
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2007-07-19 08:47:43 +00:00
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static int udf_release_file(struct inode *inode, struct file *filp)
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2005-04-16 22:20:36 +00:00
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{
|
2014-09-09 11:03:03 +00:00
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if (filp->f_mode & FMODE_WRITE &&
|
2015-01-28 07:38:20 +00:00
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atomic_read(&inode->i_writecount) == 1) {
|
2014-09-09 11:03:03 +00:00
|
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/*
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* Grab i_mutex to avoid races with writes changing i_size
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* while we are running.
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*/
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mutex_lock(&inode->i_mutex);
|
2010-11-16 17:40:47 +00:00
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down_write(&UDF_I(inode)->i_data_sem);
|
2005-04-16 22:20:36 +00:00
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udf_discard_prealloc(inode);
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2009-12-03 12:39:28 +00:00
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udf_truncate_tail_extent(inode);
|
2010-11-16 17:40:47 +00:00
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up_write(&UDF_I(inode)->i_data_sem);
|
2014-09-09 11:03:03 +00:00
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mutex_unlock(&inode->i_mutex);
|
2005-04-16 22:20:36 +00:00
|
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}
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return 0;
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}
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|
|
2006-03-28 09:56:42 +00:00
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|
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const struct file_operations udf_file_operations = {
|
2014-04-02 18:33:16 +00:00
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.read_iter = generic_file_read_iter,
|
2010-05-05 13:15:39 +00:00
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.unlocked_ioctl = udf_ioctl,
|
2010-05-19 14:28:56 +00:00
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.open = generic_file_open,
|
2007-07-21 11:37:18 +00:00
|
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.mmap = generic_file_mmap,
|
2014-04-03 07:31:17 +00:00
|
|
|
.write_iter = udf_file_write_iter,
|
2007-07-21 11:37:18 +00:00
|
|
|
.release = udf_release_file,
|
2010-05-26 15:53:41 +00:00
|
|
|
.fsync = generic_file_fsync,
|
2007-07-21 11:37:18 +00:00
|
|
|
.splice_read = generic_file_splice_read,
|
2008-09-08 17:44:17 +00:00
|
|
|
.llseek = generic_file_llseek,
|
2005-04-16 22:20:36 +00:00
|
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};
|
|
|
|
|
2010-06-04 09:29:59 +00:00
|
|
|
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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|
|
|
|
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|
error = inode_change_ok(inode, attr);
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|
|
if (error)
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|
|
return error;
|
2010-06-04 09:30:02 +00:00
|
|
|
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
|
|
attr->ia_size != i_size_read(inode)) {
|
2010-10-21 22:30:26 +00:00
|
|
|
error = udf_setsize(inode, attr->ia_size);
|
2010-06-04 09:30:02 +00:00
|
|
|
if (error)
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|
|
return error;
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|
|
|
}
|
|
|
|
|
|
|
|
setattr_copy(inode, attr);
|
|
|
|
mark_inode_dirty(inode);
|
|
|
|
return 0;
|
2010-06-04 09:29:59 +00:00
|
|
|
}
|
|
|
|
|
2007-02-12 08:55:40 +00:00
|
|
|
const struct inode_operations udf_file_inode_operations = {
|
2010-06-04 09:29:59 +00:00
|
|
|
.setattr = udf_setattr,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|