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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>
37#include <linux/buffer_head.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040038#include <linux/aio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#include "udf_i.h"
41#include "udf_sb.h"
42
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070043static int udf_adinicb_readpage(struct file *file, struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
45 struct inode *inode = page->mapping->host;
46 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080047 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Matt Mackallcd7619d2005-05-01 08:59:01 -070049 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51 kaddr = kmap(page);
52 memset(kaddr, 0, PAGE_CACHE_SIZE);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080053 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 flush_dcache_page(page);
55 SetPageUptodate(page);
56 kunmap(page);
57 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 return 0;
60}
61
Marcin Slusarz4b111112008-02-08 04:20:36 -080062static int udf_adinicb_writepage(struct page *page,
63 struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 struct inode *inode = page->mapping->host;
66 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080067 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Matt Mackallcd7619d2005-05-01 08:59:01 -070069 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71 kaddr = kmap(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080072 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 mark_inode_dirty(inode);
74 SetPageUptodate(page);
75 kunmap(page);
76 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 return 0;
79}
80
Nick Pigginbe021ee2007-10-16 01:25:20 -070081static int udf_adinicb_write_end(struct file *file,
82 struct address_space *mapping,
83 loff_t pos, unsigned len, unsigned copied,
84 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Nick Pigginbe021ee2007-10-16 01:25:20 -070086 struct inode *inode = mapping->host;
87 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
88 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080089 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Nick Pigginbe021ee2007-10-16 01:25:20 -070091 kaddr = kmap_atomic(page, KM_USER0);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080092 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
Nick Pigginbe021ee2007-10-16 01:25:20 -070093 kaddr + offset, copied);
94 kunmap_atomic(kaddr, KM_USER0);
95
96 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070099const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700100 .readpage = udf_adinicb_readpage,
101 .writepage = udf_adinicb_writepage,
102 .sync_page = block_sync_page,
Nick Pigginbe021ee2007-10-16 01:25:20 -0700103 .write_begin = simple_write_begin,
104 .write_end = udf_adinicb_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105};
106
Badari Pulavarty543ade12006-09-30 23:28:48 -0700107static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700108 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
110 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700111 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800112 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700114 size_t count = iocb->ki_left;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800115 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800117 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 if (file->f_flags & O_APPEND)
119 pos = inode->i_size;
120 else
Badari Pulavarty543ade12006-09-30 23:28:48 -0700121 pos = ppos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Marcin Slusarz4b111112008-02-08 04:20:36 -0800123 if (inode->i_sb->s_blocksize <
124 (udf_file_entry_alloc_offset(inode) +
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700125 pos + count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 udf_expand_file_adinicb(inode, pos + count, &err);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800127 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 udf_debug("udf_expand_adinicb: err=%d\n", err);
129 return err;
130 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700131 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 if (pos + count > inode->i_size)
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800133 iinfo->i_lenAlloc = pos + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 else
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800135 iinfo->i_lenAlloc = inode->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 }
137 }
138
Badari Pulavarty543ade12006-09-30 23:28:48 -0700139 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 if (retval > 0)
141 mark_inode_dirty(inode);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 return retval;
144}
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700147 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700149 long old_block, new_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 int result = -EINVAL;
151
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700152 if (file_permission(filp, MAY_READ) != 0) {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700153 udf_debug("no permission to access inode %lu\n",
154 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return -EPERM;
156 }
157
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700158 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 udf_debug("invalid argument to udf_ioctl\n");
160 return -EINVAL;
161 }
162
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700163 switch (cmd) {
164 case UDF_GETVOLIDENT:
Marcin Slusarz4b111112008-02-08 04:20:36 -0800165 if (copy_to_user((char __user *)arg,
166 UDF_SB(inode->i_sb)->s_volume_ident, 32))
167 return -EFAULT;
168 else
169 return 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700170 case UDF_RELOCATE_BLOCKS:
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700171 if (!capable(CAP_SYS_ADMIN))
172 return -EACCES;
173 if (get_user(old_block, (long __user *)arg))
174 return -EFAULT;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800175 result = udf_relocate_blocks(inode->i_sb,
176 old_block, &new_block);
177 if (result == 0)
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700178 result = put_user(new_block, (long __user *)arg);
179 return result;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700180 case UDF_GETEASIZE:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800181 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700182 break;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700183 case UDF_GETEABLOCK:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800184 result = copy_to_user((char __user *)arg,
185 UDF_I(inode)->i_ext.i_data,
186 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700187 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189
190 return result;
191}
192
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700193static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700195 if (filp->f_mode & FMODE_WRITE) {
Jan Karacbc8cc32009-08-07 00:27:27 +0200196 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 lock_kernel();
198 udf_discard_prealloc(inode);
199 unlock_kernel();
Jan Karacbc8cc32009-08-07 00:27:27 +0200200 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 }
202 return 0;
203}
204
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800205const struct file_operations udf_file_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700206 .read = do_sync_read,
207 .aio_read = generic_file_aio_read,
208 .ioctl = udf_ioctl,
209 .open = generic_file_open,
210 .mmap = generic_file_mmap,
211 .write = do_sync_write,
212 .aio_write = udf_file_aio_write,
213 .release = udf_release_file,
Al Viro90de0662009-06-07 15:40:27 -0400214 .fsync = simple_fsync,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700215 .splice_read = generic_file_splice_read,
Christoph Hellwig5c894682008-09-08 19:44:17 +0200216 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217};
218
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800219const struct inode_operations udf_file_inode_operations = {
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700220 .truncate = udf_truncate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221};