blob: bb15771b92ae32ae02390179492647a1d87c9dc2 [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>
Fabian Fredericke9736062014-06-18 19:38:24 +020030#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#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
Ian Abbott5eec54f2012-09-05 17:44:31 +0100103static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
Al Virod8d3d942014-03-04 21:27:34 -0500104 struct iov_iter *iter,
105 loff_t offset)
Ian Abbott5eec54f2012-09-05 17:44:31 +0100106{
107 /* Fallback to buffered I/O. */
108 return 0;
109}
110
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700111const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700112 .readpage = udf_adinicb_readpage,
113 .writepage = udf_adinicb_writepage,
Jan Kara9c2fc0d2012-09-05 15:48:23 +0200114 .write_begin = udf_adinicb_write_begin,
Chao Yu3f1be4f2014-07-15 09:38:51 +0800115 .write_end = simple_write_end,
Ian Abbott5eec54f2012-09-05 17:44:31 +0100116 .direct_IO = udf_adinicb_direct_IO,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117};
118
Al Virod4637bc2014-04-03 03:31:17 -0400119static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
121 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700122 struct file *file = iocb->ki_filp;
Al Viro496ad9a2013-01-23 17:07:38 -0500123 struct inode *inode = file_inode(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 int err, pos;
Kent Overstreet73a70752013-05-09 15:03:42 -0700125 size_t count = iocb->ki_nbytes;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800126 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Jan Kara09ebb172014-02-18 12:00:21 +0100128 mutex_lock(&inode->i_mutex);
Jan Kara8754a3f2010-11-16 14:33:48 +0100129 down_write(&iinfo->i_data_sem);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800130 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (file->f_flags & O_APPEND)
132 pos = inode->i_size;
133 else
Al Virod4637bc2014-04-03 03:31:17 -0400134 pos = iocb->ki_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Marcin Slusarz4b111112008-02-08 04:20:36 -0800136 if (inode->i_sb->s_blocksize <
137 (udf_file_entry_alloc_offset(inode) +
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700138 pos + count)) {
Jan Kara7e49b6f2010-10-22 00:30:26 +0200139 err = udf_expand_file_adinicb(inode);
140 if (err) {
Jan Kara09ebb172014-02-18 12:00:21 +0100141 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 udf_debug("udf_expand_adinicb: err=%d\n", err);
143 return err;
144 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700145 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (pos + count > inode->i_size)
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800147 iinfo->i_lenAlloc = pos + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 else
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800149 iinfo->i_lenAlloc = inode->i_size;
Jan Karad2eb8c32011-12-10 02:30:48 +0100150 up_write(&iinfo->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
Jan Karad2eb8c32011-12-10 02:30:48 +0100152 } else
153 up_write(&iinfo->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Al Virod4637bc2014-04-03 03:31:17 -0400155 retval = __generic_file_write_iter(iocb, from);
Jan Kara09ebb172014-02-18 12:00:21 +0100156 mutex_unlock(&inode->i_mutex);
157
158 if (retval > 0) {
159 ssize_t err;
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 mark_inode_dirty(inode);
Jan Kara09ebb172014-02-18 12:00:21 +0100162 err = generic_write_sync(file, iocb->ki_pos - retval, retval);
163 if (err < 0)
164 retval = err;
165 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return retval;
168}
169
John Kacur2f07a882010-05-05 15:15:39 +0200170long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
Al Viro496ad9a2013-01-23 17:07:38 -0500172 struct inode *inode = file_inode(filp);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700173 long old_block, new_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 int result = -EINVAL;
175
Al Viro6f286102011-06-19 11:49:08 -0400176 if (inode_permission(inode, MAY_READ) != 0) {
John Kacur2f07a882010-05-05 15:15:39 +0200177 udf_debug("no permission to access inode %lu\n", inode->i_ino);
178 result = -EPERM;
179 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700182 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 udf_debug("invalid argument to udf_ioctl\n");
John Kacur2f07a882010-05-05 15:15:39 +0200184 result = -EINVAL;
185 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700188 switch (cmd) {
189 case UDF_GETVOLIDENT:
Marcin Slusarz4b111112008-02-08 04:20:36 -0800190 if (copy_to_user((char __user *)arg,
191 UDF_SB(inode->i_sb)->s_volume_ident, 32))
John Kacur2f07a882010-05-05 15:15:39 +0200192 result = -EFAULT;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800193 else
John Kacur2f07a882010-05-05 15:15:39 +0200194 result = 0;
195 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700196 case UDF_RELOCATE_BLOCKS:
John Kacur2f07a882010-05-05 15:15:39 +0200197 if (!capable(CAP_SYS_ADMIN)) {
Zhao Hongjiang41735812013-02-20 13:13:55 +1100198 result = -EPERM;
John Kacur2f07a882010-05-05 15:15:39 +0200199 goto out;
200 }
201 if (get_user(old_block, (long __user *)arg)) {
202 result = -EFAULT;
203 goto out;
204 }
Marcin Slusarz4b111112008-02-08 04:20:36 -0800205 result = udf_relocate_blocks(inode->i_sb,
206 old_block, &new_block);
207 if (result == 0)
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700208 result = put_user(new_block, (long __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200209 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700210 case UDF_GETEASIZE:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800211 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200212 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700213 case UDF_GETEABLOCK:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800214 result = copy_to_user((char __user *)arg,
215 UDF_I(inode)->i_ext.i_data,
216 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
John Kacur2f07a882010-05-05 15:15:39 +0200217 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 }
219
John Kacur2f07a882010-05-05 15:15:39 +0200220out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return result;
222}
223
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700224static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Jan Kara6fb1ca92014-09-09 13:03:03 +0200226 if (filp->f_mode & FMODE_WRITE &&
227 atomic_read(&inode->i_writecount) > 1) {
228 /*
229 * Grab i_mutex to avoid races with writes changing i_size
230 * while we are running.
231 */
232 mutex_lock(&inode->i_mutex);
Alessio Igor Bogani4d0fb622010-11-16 18:40:47 +0100233 down_write(&UDF_I(inode)->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 udf_discard_prealloc(inode);
Jan Kara2c948b32009-12-03 13:39:28 +0100235 udf_truncate_tail_extent(inode);
Alessio Igor Bogani4d0fb622010-11-16 18:40:47 +0100236 up_write(&UDF_I(inode)->i_data_sem);
Jan Kara6fb1ca92014-09-09 13:03:03 +0200237 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239 return 0;
240}
241
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800242const struct file_operations udf_file_operations = {
Al Viroaad4f8b2014-04-02 14:33:16 -0400243 .read = new_sync_read,
244 .read_iter = generic_file_read_iter,
John Kacur2f07a882010-05-05 15:15:39 +0200245 .unlocked_ioctl = udf_ioctl,
Jan Kara36350462010-05-19 16:28:56 +0200246 .open = generic_file_open,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700247 .mmap = generic_file_mmap,
Al Virod4637bc2014-04-03 03:31:17 -0400248 .write = new_sync_write,
249 .write_iter = udf_file_write_iter,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700250 .release = udf_release_file,
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200251 .fsync = generic_file_fsync,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700252 .splice_read = generic_file_splice_read,
Christoph Hellwig5c894682008-09-08 19:44:17 +0200253 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254};
255
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200256static int udf_setattr(struct dentry *dentry, struct iattr *attr)
257{
258 struct inode *inode = dentry->d_inode;
259 int error;
260
261 error = inode_change_ok(inode, attr);
262 if (error)
263 return error;
Christoph Hellwig10257742010-06-04 11:30:02 +0200264
265 if ((attr->ia_valid & ATTR_SIZE) &&
266 attr->ia_size != i_size_read(inode)) {
Jan Kara7e49b6f2010-10-22 00:30:26 +0200267 error = udf_setsize(inode, attr->ia_size);
Christoph Hellwig10257742010-06-04 11:30:02 +0200268 if (error)
269 return error;
270 }
271
272 setattr_copy(inode, attr);
273 mark_inode_dirty(inode);
274 return 0;
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200275}
276
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800277const struct inode_operations udf_file_inode_operations = {
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200278 .setattr = udf_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279};