blob: 77b5953eaac87f708ed0ff6889eff5775dd3b465 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * file.c
3 *
4 * PURPOSE
5 * File handling routines for the OSTA-UDF(tm) filesystem.
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998-1999 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
16 *
17 * HISTORY
18 *
19 * 10/02/98 dgb Attempt to integrate into udf.o
20 * 10/07/98 Switched to using generic_readpage, etc., like isofs
21 * And it works!
22 * 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
23 * ICBTAG_FLAG_AD_IN_ICB.
24 * 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
25 * 05/12/99 Preliminary file write support
26 */
27
28#include "udfdecl.h"
29#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/uaccess.h>
31#include <linux/kernel.h>
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070032#include <linux/string.h> /* memset */
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080033#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/pagemap.h>
36#include <linux/buffer_head.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040037#include <linux/aio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include "udf_i.h"
40#include "udf_sb.h"
41
Jan Kara9c2fc0d2012-09-05 15:48:23 +020042static void __udf_adinicb_readpage(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
44 struct inode *inode = page->mapping->host;
45 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080046 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 kaddr = kmap(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080049 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
Jan Kara9c2fc0d2012-09-05 15:48:23 +020050 memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 flush_dcache_page(page);
52 SetPageUptodate(page);
53 kunmap(page);
Jan Kara9c2fc0d2012-09-05 15:48:23 +020054}
55
56static int udf_adinicb_readpage(struct file *file, struct page *page)
57{
58 BUG_ON(!PageLocked(page));
59 __udf_adinicb_readpage(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 return 0;
63}
64
Marcin Slusarz4b111112008-02-08 04:20:36 -080065static int udf_adinicb_writepage(struct page *page,
66 struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 struct inode *inode = page->mapping->host;
69 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080070 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Matt Mackallcd7619d2005-05-01 08:59:01 -070072 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74 kaddr = kmap(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080075 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 mark_inode_dirty(inode);
77 SetPageUptodate(page);
78 kunmap(page);
79 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return 0;
82}
83
Jan Kara9c2fc0d2012-09-05 15:48:23 +020084static int udf_adinicb_write_begin(struct file *file,
85 struct address_space *mapping, loff_t pos,
86 unsigned len, unsigned flags, struct page **pagep,
87 void **fsdata)
88{
89 struct page *page;
90
91 if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE))
92 return -EIO;
93 page = grab_cache_page_write_begin(mapping, 0, flags);
94 if (!page)
95 return -ENOMEM;
96 *pagep = page;
97
98 if (!PageUptodate(page) && len != PAGE_CACHE_SIZE)
99 __udf_adinicb_readpage(page);
100 return 0;
101}
102
Nick Pigginbe021ee2007-10-16 01:25:20 -0700103static int udf_adinicb_write_end(struct file *file,
104 struct address_space *mapping,
105 loff_t pos, unsigned len, unsigned copied,
106 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Nick Pigginbe021ee2007-10-16 01:25:20 -0700108 struct inode *inode = mapping->host;
109 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
110 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800111 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Cong Wang7c0fb222011-11-25 23:14:36 +0800113 kaddr = kmap_atomic(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800114 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
Nick Pigginbe021ee2007-10-16 01:25:20 -0700115 kaddr + offset, copied);
Cong Wang7c0fb222011-11-25 23:14:36 +0800116 kunmap_atomic(kaddr);
Nick Pigginbe021ee2007-10-16 01:25:20 -0700117
118 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
Ian Abbott5eec54f2012-09-05 17:44:31 +0100121static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
122 const struct iovec *iov,
123 loff_t offset, unsigned long nr_segs)
124{
125 /* Fallback to buffered I/O. */
126 return 0;
127}
128
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700129const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700130 .readpage = udf_adinicb_readpage,
131 .writepage = udf_adinicb_writepage,
Jan Kara9c2fc0d2012-09-05 15:48:23 +0200132 .write_begin = udf_adinicb_write_begin,
133 .write_end = udf_adinicb_write_end,
Ian Abbott5eec54f2012-09-05 17:44:31 +0100134 .direct_IO = udf_adinicb_direct_IO,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135};
136
Badari Pulavarty543ade12006-09-30 23:28:48 -0700137static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700138 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
140 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700141 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800142 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700144 size_t count = iocb->ki_left;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800145 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Jan Kara8754a3f2010-11-16 14:33:48 +0100147 down_write(&iinfo->i_data_sem);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800148 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 if (file->f_flags & O_APPEND)
150 pos = inode->i_size;
151 else
Badari Pulavarty543ade12006-09-30 23:28:48 -0700152 pos = ppos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Marcin Slusarz4b111112008-02-08 04:20:36 -0800154 if (inode->i_sb->s_blocksize <
155 (udf_file_entry_alloc_offset(inode) +
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700156 pos + count)) {
Jan Kara7e49b6f2010-10-22 00:30:26 +0200157 err = udf_expand_file_adinicb(inode);
158 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 udf_debug("udf_expand_adinicb: err=%d\n", err);
160 return err;
161 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700162 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 if (pos + count > inode->i_size)
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800164 iinfo->i_lenAlloc = pos + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 else
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800166 iinfo->i_lenAlloc = inode->i_size;
Jan Karad2eb8c32011-12-10 02:30:48 +0100167 up_write(&iinfo->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
Jan Karad2eb8c32011-12-10 02:30:48 +0100169 } else
170 up_write(&iinfo->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Badari Pulavarty543ade12006-09-30 23:28:48 -0700172 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (retval > 0)
174 mark_inode_dirty(inode);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 return retval;
177}
178
John Kacur2f07a882010-05-05 15:15:39 +0200179long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
John Kacur2f07a882010-05-05 15:15:39 +0200181 struct inode *inode = filp->f_dentry->d_inode;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700182 long old_block, new_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 int result = -EINVAL;
184
Al Viro6f286102011-06-19 11:49:08 -0400185 if (inode_permission(inode, MAY_READ) != 0) {
John Kacur2f07a882010-05-05 15:15:39 +0200186 udf_debug("no permission to access inode %lu\n", inode->i_ino);
187 result = -EPERM;
188 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
190
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700191 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 udf_debug("invalid argument to udf_ioctl\n");
John Kacur2f07a882010-05-05 15:15:39 +0200193 result = -EINVAL;
194 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
196
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700197 switch (cmd) {
198 case UDF_GETVOLIDENT:
Marcin Slusarz4b111112008-02-08 04:20:36 -0800199 if (copy_to_user((char __user *)arg,
200 UDF_SB(inode->i_sb)->s_volume_ident, 32))
John Kacur2f07a882010-05-05 15:15:39 +0200201 result = -EFAULT;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800202 else
John Kacur2f07a882010-05-05 15:15:39 +0200203 result = 0;
204 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700205 case UDF_RELOCATE_BLOCKS:
John Kacur2f07a882010-05-05 15:15:39 +0200206 if (!capable(CAP_SYS_ADMIN)) {
207 result = -EACCES;
208 goto out;
209 }
210 if (get_user(old_block, (long __user *)arg)) {
211 result = -EFAULT;
212 goto out;
213 }
Marcin Slusarz4b111112008-02-08 04:20:36 -0800214 result = udf_relocate_blocks(inode->i_sb,
215 old_block, &new_block);
216 if (result == 0)
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700217 result = put_user(new_block, (long __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200218 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700219 case UDF_GETEASIZE:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800220 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200221 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700222 case UDF_GETEABLOCK:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800223 result = copy_to_user((char __user *)arg,
224 UDF_I(inode)->i_ext.i_data,
225 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
John Kacur2f07a882010-05-05 15:15:39 +0200226 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 }
228
John Kacur2f07a882010-05-05 15:15:39 +0200229out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return result;
231}
232
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700233static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700235 if (filp->f_mode & FMODE_WRITE) {
Alessio Igor Bogani4d0fb622010-11-16 18:40:47 +0100236 down_write(&UDF_I(inode)->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 udf_discard_prealloc(inode);
Jan Kara2c948b32009-12-03 13:39:28 +0100238 udf_truncate_tail_extent(inode);
Alessio Igor Bogani4d0fb622010-11-16 18:40:47 +0100239 up_write(&UDF_I(inode)->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
241 return 0;
242}
243
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800244const struct file_operations udf_file_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700245 .read = do_sync_read,
246 .aio_read = generic_file_aio_read,
John Kacur2f07a882010-05-05 15:15:39 +0200247 .unlocked_ioctl = udf_ioctl,
Jan Kara36350462010-05-19 16:28:56 +0200248 .open = generic_file_open,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700249 .mmap = generic_file_mmap,
250 .write = do_sync_write,
251 .aio_write = udf_file_aio_write,
252 .release = udf_release_file,
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200253 .fsync = generic_file_fsync,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700254 .splice_read = generic_file_splice_read,
Christoph Hellwig5c894682008-09-08 19:44:17 +0200255 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256};
257
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200258static int udf_setattr(struct dentry *dentry, struct iattr *attr)
259{
260 struct inode *inode = dentry->d_inode;
261 int error;
262
263 error = inode_change_ok(inode, attr);
264 if (error)
265 return error;
Christoph Hellwig10257742010-06-04 11:30:02 +0200266
267 if ((attr->ia_valid & ATTR_SIZE) &&
268 attr->ia_size != i_size_read(inode)) {
Jan Kara7e49b6f2010-10-22 00:30:26 +0200269 error = udf_setsize(inode, attr->ia_size);
Christoph Hellwig10257742010-06-04 11:30:02 +0200270 if (error)
271 return error;
272 }
273
274 setattr_copy(inode, attr);
275 mark_inode_dirty(inode);
276 return 0;
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200277}
278
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800279const struct inode_operations udf_file_inode_operations = {
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200280 .setattr = udf_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281};