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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>
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
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070042static int udf_adinicb_readpage(struct file *file, 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
Matt Mackallcd7619d2005-05-01 08:59:01 -070048 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50 kaddr = kmap(page);
51 memset(kaddr, 0, PAGE_CACHE_SIZE);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080052 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 flush_dcache_page(page);
54 SetPageUptodate(page);
55 kunmap(page);
56 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 return 0;
59}
60
Marcin Slusarz4b111112008-02-08 04:20:36 -080061static int udf_adinicb_writepage(struct page *page,
62 struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
64 struct inode *inode = page->mapping->host;
65 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080066 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Matt Mackallcd7619d2005-05-01 08:59:01 -070068 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 kaddr = kmap(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080071 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 mark_inode_dirty(inode);
73 SetPageUptodate(page);
74 kunmap(page);
75 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 return 0;
78}
79
Nick Pigginbe021ee2007-10-16 01:25:20 -070080static int udf_adinicb_write_end(struct file *file,
81 struct address_space *mapping,
82 loff_t pos, unsigned len, unsigned copied,
83 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
Nick Pigginbe021ee2007-10-16 01:25:20 -070085 struct inode *inode = mapping->host;
86 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
87 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080088 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Cong Wang7c0fb222011-11-25 23:14:36 +080090 kaddr = kmap_atomic(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080091 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
Nick Pigginbe021ee2007-10-16 01:25:20 -070092 kaddr + offset, copied);
Cong Wang7c0fb222011-11-25 23:14:36 +080093 kunmap_atomic(kaddr);
Nick Pigginbe021ee2007-10-16 01:25:20 -070094
95 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070098const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070099 .readpage = udf_adinicb_readpage,
100 .writepage = udf_adinicb_writepage,
Nick Pigginbe021ee2007-10-16 01:25:20 -0700101 .write_begin = simple_write_begin,
102 .write_end = udf_adinicb_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103};
104
Badari Pulavarty543ade12006-09-30 23:28:48 -0700105static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700106 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
108 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700109 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800110 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700112 size_t count = iocb->ki_left;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800113 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Jan Kara8754a3f2010-11-16 14:33:48 +0100115 down_write(&iinfo->i_data_sem);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800116 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (file->f_flags & O_APPEND)
118 pos = inode->i_size;
119 else
Badari Pulavarty543ade12006-09-30 23:28:48 -0700120 pos = ppos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Marcin Slusarz4b111112008-02-08 04:20:36 -0800122 if (inode->i_sb->s_blocksize <
123 (udf_file_entry_alloc_offset(inode) +
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700124 pos + count)) {
Jan Kara7e49b6f2010-10-22 00:30:26 +0200125 err = udf_expand_file_adinicb(inode);
126 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 udf_debug("udf_expand_adinicb: err=%d\n", err);
128 return err;
129 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700130 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (pos + count > inode->i_size)
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800132 iinfo->i_lenAlloc = pos + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 else
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800134 iinfo->i_lenAlloc = inode->i_size;
Jan Karad2eb8c32011-12-10 02:30:48 +0100135 up_write(&iinfo->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 }
Jan Karad2eb8c32011-12-10 02:30:48 +0100137 } else
138 up_write(&iinfo->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
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
John Kacur2f07a882010-05-05 15:15:39 +0200147long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
John Kacur2f07a882010-05-05 15:15:39 +0200149 struct inode *inode = filp->f_dentry->d_inode;
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
Al Viro6f286102011-06-19 11:49:08 -0400153 if (inode_permission(inode, MAY_READ) != 0) {
John Kacur2f07a882010-05-05 15:15:39 +0200154 udf_debug("no permission to access inode %lu\n", inode->i_ino);
155 result = -EPERM;
156 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
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");
John Kacur2f07a882010-05-05 15:15:39 +0200161 result = -EINVAL;
162 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 }
164
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700165 switch (cmd) {
166 case UDF_GETVOLIDENT:
Marcin Slusarz4b111112008-02-08 04:20:36 -0800167 if (copy_to_user((char __user *)arg,
168 UDF_SB(inode->i_sb)->s_volume_ident, 32))
John Kacur2f07a882010-05-05 15:15:39 +0200169 result = -EFAULT;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800170 else
John Kacur2f07a882010-05-05 15:15:39 +0200171 result = 0;
172 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700173 case UDF_RELOCATE_BLOCKS:
John Kacur2f07a882010-05-05 15:15:39 +0200174 if (!capable(CAP_SYS_ADMIN)) {
175 result = -EACCES;
176 goto out;
177 }
178 if (get_user(old_block, (long __user *)arg)) {
179 result = -EFAULT;
180 goto out;
181 }
Marcin Slusarz4b111112008-02-08 04:20:36 -0800182 result = udf_relocate_blocks(inode->i_sb,
183 old_block, &new_block);
184 if (result == 0)
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700185 result = put_user(new_block, (long __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200186 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700187 case UDF_GETEASIZE:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800188 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200189 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700190 case UDF_GETEABLOCK:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800191 result = copy_to_user((char __user *)arg,
192 UDF_I(inode)->i_ext.i_data,
193 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
John Kacur2f07a882010-05-05 15:15:39 +0200194 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
196
John Kacur2f07a882010-05-05 15:15:39 +0200197out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return result;
199}
200
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700201static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700203 if (filp->f_mode & FMODE_WRITE) {
Alessio Igor Bogani4d0fb622010-11-16 18:40:47 +0100204 down_write(&UDF_I(inode)->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 udf_discard_prealloc(inode);
Jan Kara2c948b32009-12-03 13:39:28 +0100206 udf_truncate_tail_extent(inode);
Alessio Igor Bogani4d0fb622010-11-16 18:40:47 +0100207 up_write(&UDF_I(inode)->i_data_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 }
209 return 0;
210}
211
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800212const struct file_operations udf_file_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700213 .read = do_sync_read,
214 .aio_read = generic_file_aio_read,
John Kacur2f07a882010-05-05 15:15:39 +0200215 .unlocked_ioctl = udf_ioctl,
Jan Kara36350462010-05-19 16:28:56 +0200216 .open = generic_file_open,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700217 .mmap = generic_file_mmap,
218 .write = do_sync_write,
219 .aio_write = udf_file_aio_write,
220 .release = udf_release_file,
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200221 .fsync = generic_file_fsync,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700222 .splice_read = generic_file_splice_read,
Christoph Hellwig5c894682008-09-08 19:44:17 +0200223 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224};
225
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200226static int udf_setattr(struct dentry *dentry, struct iattr *attr)
227{
228 struct inode *inode = dentry->d_inode;
229 int error;
230
231 error = inode_change_ok(inode, attr);
232 if (error)
233 return error;
Christoph Hellwig10257742010-06-04 11:30:02 +0200234
235 if ((attr->ia_valid & ATTR_SIZE) &&
236 attr->ia_size != i_size_read(inode)) {
Jan Kara7e49b6f2010-10-22 00:30:26 +0200237 error = udf_setsize(inode, attr->ia_size);
Christoph Hellwig10257742010-06-04 11:30:02 +0200238 if (error)
239 return error;
240 }
241
242 setattr_copy(inode, attr);
243 mark_inode_dirty(inode);
244 return 0;
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200245}
246
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800247const struct inode_operations udf_file_inode_operations = {
Christoph Hellwigd39aae92010-06-04 11:29:59 +0200248 .setattr = udf_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249};