blob: 83092fb025e2a7e282f44029383a55adfe0e39c0 [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>
John Kacur2f07a882010-05-05 15:15:39 +020040#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#include "udf_i.h"
43#include "udf_sb.h"
44
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070045static int udf_adinicb_readpage(struct file *file, struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
47 struct inode *inode = page->mapping->host;
48 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080049 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Matt Mackallcd7619d2005-05-01 08:59:01 -070051 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53 kaddr = kmap(page);
54 memset(kaddr, 0, PAGE_CACHE_SIZE);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080055 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 flush_dcache_page(page);
57 SetPageUptodate(page);
58 kunmap(page);
59 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070060
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 return 0;
62}
63
Marcin Slusarz4b111112008-02-08 04:20:36 -080064static int udf_adinicb_writepage(struct page *page,
65 struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
67 struct inode *inode = page->mapping->host;
68 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080069 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Matt Mackallcd7619d2005-05-01 08:59:01 -070071 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73 kaddr = kmap(page);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080074 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 mark_inode_dirty(inode);
76 SetPageUptodate(page);
77 kunmap(page);
78 unlock_page(page);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070079
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 return 0;
81}
82
Nick Pigginbe021ee2007-10-16 01:25:20 -070083static int udf_adinicb_write_end(struct file *file,
84 struct address_space *mapping,
85 loff_t pos, unsigned len, unsigned copied,
86 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Nick Pigginbe021ee2007-10-16 01:25:20 -070088 struct inode *inode = mapping->host;
89 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
90 char *kaddr;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080091 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Nick Pigginbe021ee2007-10-16 01:25:20 -070093 kaddr = kmap_atomic(page, KM_USER0);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080094 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
Nick Pigginbe021ee2007-10-16 01:25:20 -070095 kaddr + offset, copied);
96 kunmap_atomic(kaddr, KM_USER0);
97
98 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700101const struct address_space_operations udf_adinicb_aops = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700102 .readpage = udf_adinicb_readpage,
103 .writepage = udf_adinicb_writepage,
104 .sync_page = block_sync_page,
Nick Pigginbe021ee2007-10-16 01:25:20 -0700105 .write_begin = simple_write_begin,
106 .write_end = udf_adinicb_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
Badari Pulavarty543ade12006-09-30 23:28:48 -0700109static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700110 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700113 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800114 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700116 size_t count = iocb->ki_left;
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800117 struct udf_inode_info *iinfo = UDF_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800119 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 if (file->f_flags & O_APPEND)
121 pos = inode->i_size;
122 else
Badari Pulavarty543ade12006-09-30 23:28:48 -0700123 pos = ppos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Marcin Slusarz4b111112008-02-08 04:20:36 -0800125 if (inode->i_sb->s_blocksize <
126 (udf_file_entry_alloc_offset(inode) +
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700127 pos + count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 udf_expand_file_adinicb(inode, pos + count, &err);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800129 if (iinfo->i_alloc_type == 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)
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800135 iinfo->i_lenAlloc = pos + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 else
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800137 iinfo->i_lenAlloc = inode->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 }
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
John Kacur2f07a882010-05-05 15:15:39 +0200148long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
John Kacur2f07a882010-05-05 15:15:39 +0200150 struct inode *inode = filp->f_dentry->d_inode;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700151 long old_block, new_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 int result = -EINVAL;
153
John Kacur2f07a882010-05-05 15:15:39 +0200154 lock_kernel();
155
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700156 if (file_permission(filp, MAY_READ) != 0) {
John Kacur2f07a882010-05-05 15:15:39 +0200157 udf_debug("no permission to access inode %lu\n", inode->i_ino);
158 result = -EPERM;
159 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 }
161
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700162 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 udf_debug("invalid argument to udf_ioctl\n");
John Kacur2f07a882010-05-05 15:15:39 +0200164 result = -EINVAL;
165 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 }
167
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700168 switch (cmd) {
169 case UDF_GETVOLIDENT:
Marcin Slusarz4b111112008-02-08 04:20:36 -0800170 if (copy_to_user((char __user *)arg,
171 UDF_SB(inode->i_sb)->s_volume_ident, 32))
John Kacur2f07a882010-05-05 15:15:39 +0200172 result = -EFAULT;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800173 else
John Kacur2f07a882010-05-05 15:15:39 +0200174 result = 0;
175 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700176 case UDF_RELOCATE_BLOCKS:
John Kacur2f07a882010-05-05 15:15:39 +0200177 if (!capable(CAP_SYS_ADMIN)) {
178 result = -EACCES;
179 goto out;
180 }
181 if (get_user(old_block, (long __user *)arg)) {
182 result = -EFAULT;
183 goto out;
184 }
Marcin Slusarz4b111112008-02-08 04:20:36 -0800185 result = udf_relocate_blocks(inode->i_sb,
186 old_block, &new_block);
187 if (result == 0)
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700188 result = put_user(new_block, (long __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200189 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700190 case UDF_GETEASIZE:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800191 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
John Kacur2f07a882010-05-05 15:15:39 +0200192 goto out;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700193 case UDF_GETEABLOCK:
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800194 result = copy_to_user((char __user *)arg,
195 UDF_I(inode)->i_ext.i_data,
196 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
John Kacur2f07a882010-05-05 15:15:39 +0200197 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
199
John Kacur2f07a882010-05-05 15:15:39 +0200200out:
201 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return result;
203}
204
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700205static int udf_release_file(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700207 if (filp->f_mode & FMODE_WRITE) {
Jan Karacbc8cc32009-08-07 00:27:27 +0200208 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 lock_kernel();
210 udf_discard_prealloc(inode);
Jan Kara2c948b32009-12-03 13:39:28 +0100211 udf_truncate_tail_extent(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 unlock_kernel();
Jan Karacbc8cc32009-08-07 00:27:27 +0200213 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 }
215 return 0;
216}
217
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800218const struct file_operations udf_file_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700219 .read = do_sync_read,
220 .aio_read = generic_file_aio_read,
John Kacur2f07a882010-05-05 15:15:39 +0200221 .unlocked_ioctl = udf_ioctl,
Christoph Hellwig907f4552010-03-03 09:05:06 -0500222 .open = dquot_file_open,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700223 .mmap = generic_file_mmap,
224 .write = do_sync_write,
225 .aio_write = udf_file_aio_write,
226 .release = udf_release_file,
Al Viro90de0662009-06-07 15:40:27 -0400227 .fsync = simple_fsync,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700228 .splice_read = generic_file_splice_read,
Christoph Hellwig5c894682008-09-08 19:44:17 +0200229 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230};
231
Dmitry Monakhovc15d0fc2010-03-29 11:05:21 +0400232int udf_setattr(struct dentry *dentry, struct iattr *iattr)
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500233{
234 struct inode *inode = dentry->d_inode;
235 int error;
236
237 error = inode_change_ok(inode, iattr);
238 if (error)
239 return error;
240
Christoph Hellwig907f4552010-03-03 09:05:06 -0500241 if (iattr->ia_valid & ATTR_SIZE)
Christoph Hellwig871a2932010-03-03 09:05:07 -0500242 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500243
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500244 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
245 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
Christoph Hellwigb43fa822010-03-03 09:05:03 -0500246 error = dquot_transfer(inode, iattr);
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500247 if (error)
248 return error;
249 }
250
251 return inode_setattr(inode, iattr);
252}
253
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800254const struct inode_operations udf_file_inode_operations = {
Christoph Hellwig759bfee2010-03-03 09:05:02 -0500255 .truncate = udf_truncate,
256 .setattr = udf_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257};