blob: 5d7a4ea27753b4afb8ebc012aa7542b0aa0f3981 [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>
30#include <linux/udf_fs.h>
31#include <asm/uaccess.h>
32#include <linux/kernel.h>
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070033#include <linux/string.h> /* memset */
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080034#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/errno.h>
36#include <linux/smp_lock.h>
37#include <linux/pagemap.h>
38#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;
48
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);
53 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
54 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
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070062static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
64 struct inode *inode = page->mapping->host;
65 char *kaddr;
66
Matt Mackallcd7619d2005-05-01 08:59:01 -070067 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69 kaddr = kmap(page);
70 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
71 mark_inode_dirty(inode);
72 SetPageUptodate(page);
73 kunmap(page);
74 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 return 0;
77}
78
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070079static int udf_adinicb_prepare_write(struct file *file, struct page *page,
80 unsigned offset, unsigned to)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
82 kmap(page);
83 return 0;
84}
85
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070086static int udf_adinicb_commit_write(struct file *file, struct page *page,
87 unsigned offset, unsigned to)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
89 struct inode *inode = page->mapping->host;
90 char *kaddr = page_address(page);
91
92 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070093 kaddr + offset, to - offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 mark_inode_dirty(inode);
95 SetPageUptodate(page);
96 kunmap(page);
97 /* only one page here */
98 if (to > inode->i_size)
99 inode->i_size = to;
100 return 0;
101}
102
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700103const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700104 .readpage = udf_adinicb_readpage,
105 .writepage = udf_adinicb_writepage,
106 .sync_page = block_sync_page,
107 .prepare_write = udf_adinicb_prepare_write,
108 .commit_write = udf_adinicb_commit_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109};
110
Badari Pulavarty543ade12006-09-30 23:28:48 -0700111static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700112 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
114 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700115 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800116 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700118 size_t count = iocb->ki_left;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700120 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (file->f_flags & O_APPEND)
122 pos = inode->i_size;
123 else
Badari Pulavarty543ade12006-09-30 23:28:48 -0700124 pos = ppos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700126 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
127 pos + count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 udf_expand_file_adinicb(inode, pos + count, &err);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700129 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 udf_debug("udf_expand_adinicb: err=%d\n", err);
131 return err;
132 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700133 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 if (pos + count > inode->i_size)
135 UDF_I_LENALLOC(inode) = pos + count;
136 else
137 UDF_I_LENALLOC(inode) = inode->i_size;
138 }
139 }
140
Badari Pulavarty543ade12006-09-30 23:28:48 -0700141 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 if (retval > 0)
143 mark_inode_dirty(inode);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 return retval;
146}
147
148/*
149 * udf_ioctl
150 *
151 * PURPOSE
152 * Issue an ioctl.
153 *
154 * DESCRIPTION
155 * Optional - sys_ioctl() will return -ENOTTY if this routine is not
156 * available, and the ioctl cannot be handled without filesystem help.
157 *
158 * sys_ioctl() handles these ioctls that apply only to regular files:
159 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
160 * These ioctls are also handled by sys_ioctl():
161 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
162 * All other ioctls are passed to the filesystem.
163 *
164 * Refer to sys_ioctl() in fs/ioctl.c
165 * sys_ioctl() -> .
166 *
167 * PRE-CONDITIONS
168 * inode Pointer to inode that ioctl was issued on.
169 * filp Pointer to file that ioctl was issued on.
170 * cmd The ioctl command.
171 * arg The ioctl argument [can be interpreted as a
172 * user-space pointer if desired].
173 *
174 * POST-CONDITIONS
175 * <return> Success (>=0) or an error code (<=0) that
176 * sys_ioctl() will return.
177 *
178 * HISTORY
179 * July 1, 1997 - Andrew E. Mileski
180 * Written, tested, and released.
181 */
182int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700183 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700185 long old_block, new_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 int result = -EINVAL;
187
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700188 if (file_permission(filp, MAY_READ) != 0) {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700189 udf_debug("no permission to access inode %lu\n",
190 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 return -EPERM;
192 }
193
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700194 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 udf_debug("invalid argument to udf_ioctl\n");
196 return -EINVAL;
197 }
198
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700199 switch (cmd) {
200 case UDF_GETVOLIDENT:
201 return copy_to_user((char __user *)arg,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700202 UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700203 case UDF_RELOCATE_BLOCKS:
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700204 if (!capable(CAP_SYS_ADMIN))
205 return -EACCES;
206 if (get_user(old_block, (long __user *)arg))
207 return -EFAULT;
208 if ((result = udf_relocate_blocks(inode->i_sb,
209 old_block, &new_block)) == 0)
210 result = put_user(new_block, (long __user *)arg);
211 return result;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700212 case UDF_GETEASIZE:
213 result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
214 break;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700215 case UDF_GETEABLOCK:
216 result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
217 UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
218 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 }
220
221 return result;
222}
223
224/*
225 * udf_release_file
226 *
227 * PURPOSE
228 * Called when all references to the file are closed
229 *
230 * DESCRIPTION
231 * Discard prealloced blocks
232 *
233 * HISTORY
234 *
235 */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700236static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700238 if (filp->f_mode & FMODE_WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 lock_kernel();
240 udf_discard_prealloc(inode);
241 unlock_kernel();
242 }
243 return 0;
244}
245
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800246const struct file_operations udf_file_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700247 .read = do_sync_read,
248 .aio_read = generic_file_aio_read,
249 .ioctl = udf_ioctl,
250 .open = generic_file_open,
251 .mmap = generic_file_mmap,
252 .write = do_sync_write,
253 .aio_write = udf_file_aio_write,
254 .release = udf_release_file,
255 .fsync = udf_fsync_file,
256 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257};
258
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800259const struct inode_operations udf_file_inode_operations = {
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700260 .truncate = udf_truncate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261};