blob: 7c7a1b39d56c9071cd28370f92b1945e659aa702 [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
Nick Pigginbe021ee2007-10-16 01:25:20 -070079static int udf_adinicb_write_end(struct file *file,
80 struct address_space *mapping,
81 loff_t pos, unsigned len, unsigned copied,
82 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
Nick Pigginbe021ee2007-10-16 01:25:20 -070084 struct inode *inode = mapping->host;
85 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
86 char *kaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Nick Pigginbe021ee2007-10-16 01:25:20 -070088 kaddr = kmap_atomic(page, KM_USER0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
Nick Pigginbe021ee2007-10-16 01:25:20 -070090 kaddr + offset, copied);
91 kunmap_atomic(kaddr, KM_USER0);
92
93 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070096const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070097 .readpage = udf_adinicb_readpage,
98 .writepage = udf_adinicb_writepage,
99 .sync_page = block_sync_page,
Nick Pigginbe021ee2007-10-16 01:25:20 -0700100 .write_begin = simple_write_begin,
101 .write_end = udf_adinicb_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102};
103
Badari Pulavarty543ade12006-09-30 23:28:48 -0700104static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700105 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
107 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700108 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800109 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700111 size_t count = iocb->ki_left;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700113 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if (file->f_flags & O_APPEND)
115 pos = inode->i_size;
116 else
Badari Pulavarty543ade12006-09-30 23:28:48 -0700117 pos = ppos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700119 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
120 pos + count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 udf_expand_file_adinicb(inode, pos + count, &err);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700122 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 udf_debug("udf_expand_adinicb: err=%d\n", err);
124 return err;
125 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700126 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 if (pos + count > inode->i_size)
128 UDF_I_LENALLOC(inode) = pos + count;
129 else
130 UDF_I_LENALLOC(inode) = inode->i_size;
131 }
132 }
133
Badari Pulavarty543ade12006-09-30 23:28:48 -0700134 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (retval > 0)
136 mark_inode_dirty(inode);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 return retval;
139}
140
141/*
142 * udf_ioctl
143 *
144 * PURPOSE
145 * Issue an ioctl.
146 *
147 * DESCRIPTION
148 * Optional - sys_ioctl() will return -ENOTTY if this routine is not
149 * available, and the ioctl cannot be handled without filesystem help.
150 *
151 * sys_ioctl() handles these ioctls that apply only to regular files:
152 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
153 * These ioctls are also handled by sys_ioctl():
154 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
155 * All other ioctls are passed to the filesystem.
156 *
157 * Refer to sys_ioctl() in fs/ioctl.c
158 * sys_ioctl() -> .
159 *
160 * PRE-CONDITIONS
161 * inode Pointer to inode that ioctl was issued on.
162 * filp Pointer to file that ioctl was issued on.
163 * cmd The ioctl command.
164 * arg The ioctl argument [can be interpreted as a
165 * user-space pointer if desired].
166 *
167 * POST-CONDITIONS
168 * <return> Success (>=0) or an error code (<=0) that
169 * sys_ioctl() will return.
170 *
171 * HISTORY
172 * July 1, 1997 - Andrew E. Mileski
173 * Written, tested, and released.
174 */
175int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700176 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700178 long old_block, new_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 int result = -EINVAL;
180
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700181 if (file_permission(filp, MAY_READ) != 0) {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700182 udf_debug("no permission to access inode %lu\n",
183 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return -EPERM;
185 }
186
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700187 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 udf_debug("invalid argument to udf_ioctl\n");
189 return -EINVAL;
190 }
191
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700192 switch (cmd) {
193 case UDF_GETVOLIDENT:
194 return copy_to_user((char __user *)arg,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700195 UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700196 case UDF_RELOCATE_BLOCKS:
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700197 if (!capable(CAP_SYS_ADMIN))
198 return -EACCES;
199 if (get_user(old_block, (long __user *)arg))
200 return -EFAULT;
201 if ((result = udf_relocate_blocks(inode->i_sb,
202 old_block, &new_block)) == 0)
203 result = put_user(new_block, (long __user *)arg);
204 return result;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700205 case UDF_GETEASIZE:
206 result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
207 break;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700208 case UDF_GETEABLOCK:
209 result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
210 UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
211 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213
214 return result;
215}
216
217/*
218 * udf_release_file
219 *
220 * PURPOSE
221 * Called when all references to the file are closed
222 *
223 * DESCRIPTION
224 * Discard prealloced blocks
225 *
226 * HISTORY
227 *
228 */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700229static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700231 if (filp->f_mode & FMODE_WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 lock_kernel();
233 udf_discard_prealloc(inode);
234 unlock_kernel();
235 }
236 return 0;
237}
238
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800239const struct file_operations udf_file_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700240 .read = do_sync_read,
241 .aio_read = generic_file_aio_read,
242 .ioctl = udf_ioctl,
243 .open = generic_file_open,
244 .mmap = generic_file_mmap,
245 .write = do_sync_write,
246 .aio_write = udf_file_aio_write,
247 .release = udf_release_file,
248 .fsync = udf_fsync_file,
249 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250};
251
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800252const struct inode_operations udf_file_inode_operations = {
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700253 .truncate = udf_truncate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254};