blob: 4b6a46ccbf46771d7b363974c2416b8f63a7b946 [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>
35#include <linux/smp_lock.h>
36#include <linux/pagemap.h>
Christoph Hellwig759bfee2010-03-03 09:05:02 -050037#include <linux/quotaops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/buffer_head.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040039#include <linux/aio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include "udf_i.h"
42#include "udf_sb.h"
43
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070044static int udf_adinicb_readpage(struct file *file, struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
46 struct inode *inode = page->mapping->host;
47 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080048 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Matt Mackallcd7619d2005-05-01 08:59:01 -070050 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52 kaddr = kmap(page);
53 memset(kaddr, 0, PAGE_CACHE_SIZE);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080054 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 flush_dcache_page(page);
56 SetPageUptodate(page);
57 kunmap(page);
58 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return 0;
61}
62
Marcin Slusarz4b111112008-02-08 04:20:36 -080063static int udf_adinicb_writepage(struct page *page,
64 struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
66 struct inode *inode = page->mapping->host;
67 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080068 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Matt Mackallcd7619d2005-05-01 08:59:01 -070070 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72 kaddr = kmap(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080073 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 mark_inode_dirty(inode);
75 SetPageUptodate(page);
76 kunmap(page);
77 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070078
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 return 0;
80}
81
Nick Pigginbe021ee2007-10-16 01:25:20 -070082static int udf_adinicb_write_end(struct file *file,
83 struct address_space *mapping,
84 loff_t pos, unsigned len, unsigned copied,
85 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Nick Pigginbe021ee2007-10-16 01:25:20 -070087 struct inode *inode = mapping->host;
88 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
89 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080090 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Nick Pigginbe021ee2007-10-16 01:25:20 -070092 kaddr = kmap_atomic(page, KM_USER0);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080093 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
Nick Pigginbe021ee2007-10-16 01:25:20 -070094 kaddr + offset, copied);
95 kunmap_atomic(kaddr, KM_USER0);
96
97 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700100const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700101 .readpage = udf_adinicb_readpage,
102 .writepage = udf_adinicb_writepage,
103 .sync_page = block_sync_page,
Nick Pigginbe021ee2007-10-16 01:25:20 -0700104 .write_begin = simple_write_begin,
105 .write_end = udf_adinicb_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106};
107
Badari Pulavarty543ade12006-09-30 23:28:48 -0700108static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700109 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700112 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800113 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700115 size_t count = iocb->ki_left;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800116 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800118 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (file->f_flags & O_APPEND)
120 pos = inode->i_size;
121 else
Badari Pulavarty543ade12006-09-30 23:28:48 -0700122 pos = ppos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Marcin Slusarz4b111112008-02-08 04:20:36 -0800124 if (inode->i_sb->s_blocksize <
125 (udf_file_entry_alloc_offset(inode) +
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700126 pos + count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 udf_expand_file_adinicb(inode, pos + count, &err);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800128 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 udf_debug("udf_expand_adinicb: err=%d\n", err);
130 return err;
131 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700132 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if (pos + count > inode->i_size)
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800134 iinfo->i_lenAlloc = pos + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 else
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800136 iinfo->i_lenAlloc = inode->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
138 }
139
Badari Pulavarty543ade12006-09-30 23:28:48 -0700140 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (retval > 0)
142 mark_inode_dirty(inode);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 return retval;
145}
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700148 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700150 long old_block, new_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 int result = -EINVAL;
152
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700153 if (file_permission(filp, MAY_READ) != 0) {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700154 udf_debug("no permission to access inode %lu\n",
155 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return -EPERM;
157 }
158
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700159 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 udf_debug("invalid argument to udf_ioctl\n");
161 return -EINVAL;
162 }
163
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700164 switch (cmd) {
165 case UDF_GETVOLIDENT:
Marcin Slusarz4b111112008-02-08 04:20:36 -0800166 if (copy_to_user((char __user *)arg,
167 UDF_SB(inode->i_sb)->s_volume_ident, 32))
168 return -EFAULT;
169 else
170 return 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700171 case UDF_RELOCATE_BLOCKS:
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700172 if (!capable(CAP_SYS_ADMIN))
173 return -EACCES;
174 if (get_user(old_block, (long __user *)arg))
175 return -EFAULT;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800176 result = udf_relocate_blocks(inode->i_sb,
177 old_block, &new_block);
178 if (result == 0)
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700179 result = put_user(new_block, (long __user *)arg);
180 return result;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700181 case UDF_GETEASIZE:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800182 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700183 break;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700184 case UDF_GETEABLOCK:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800185 result = copy_to_user((char __user *)arg,
186 UDF_I(inode)->i_ext.i_data,
187 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700188 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
190
191 return result;
192}
193
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700194static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700196 if (filp->f_mode & FMODE_WRITE) {
Jan Karacbc8cc32009-08-07 00:27:27 +0200197 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 lock_kernel();
199 udf_discard_prealloc(inode);
Jan Kara2c948b32009-12-03 13:39:28 +0100200 udf_truncate_tail_extent(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 unlock_kernel();
Jan Karacbc8cc32009-08-07 00:27:27 +0200202 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
204 return 0;
205}
206
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800207const struct file_operations udf_file_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700208 .read = do_sync_read,
209 .aio_read = generic_file_aio_read,
210 .ioctl = udf_ioctl,
Christoph Hellwig907f4552010-03-03 09:05:06 -0500211 .open = dquot_file_open,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700212 .mmap = generic_file_mmap,
213 .write = do_sync_write,
214 .aio_write = udf_file_aio_write,
215 .release = udf_release_file,
Al Viro90de0662009-06-07 15:40:27 -0400216 .fsync = simple_fsync,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700217 .splice_read = generic_file_splice_read,
Christoph Hellwig5c894682008-09-08 19:44:17 +0200218 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219};
220
Dmitry Monakhovc15d0fc2010-03-29 11:05:21 +0400221int udf_setattr(struct dentry *dentry, struct iattr *iattr)
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500222{
223 struct inode *inode = dentry->d_inode;
224 int error;
225
226 error = inode_change_ok(inode, iattr);
227 if (error)
228 return error;
229
Christoph Hellwig907f4552010-03-03 09:05:06 -0500230 if (iattr->ia_valid & ATTR_SIZE)
Christoph Hellwig871a2932010-03-03 09:05:07 -0500231 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500232
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500233 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
234 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
Christoph Hellwigb43fa822010-03-03 09:05:03 -0500235 error = dquot_transfer(inode, iattr);
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500236 if (error)
237 return error;
238 }
239
240 return inode_setattr(inode, iattr);
241}
242
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800243const struct inode_operations udf_file_inode_operations = {
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500244 .truncate = udf_truncate,
245 .setattr = udf_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246};