blob: a59e5f33daf6f7ed5225d8f85c349acbf29f05ab [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>
33#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>
39
40#include "udf_i.h"
41#include "udf_sb.h"
42
43static int udf_adinicb_readpage(struct file *file, struct page * page)
44{
45 struct inode *inode = page->mapping->host;
46 char *kaddr;
47
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);
52 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
53 flush_dcache_page(page);
54 SetPageUptodate(page);
55 kunmap(page);
56 unlock_page(page);
57 return 0;
58}
59
60static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc)
61{
62 struct inode *inode = page->mapping->host;
63 char *kaddr;
64
Matt Mackallcd7619d2005-05-01 08:59:01 -070065 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67 kaddr = kmap(page);
68 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
69 mark_inode_dirty(inode);
70 SetPageUptodate(page);
71 kunmap(page);
72 unlock_page(page);
73 return 0;
74}
75
76static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
77{
78 kmap(page);
79 return 0;
80}
81
82static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
83{
84 struct inode *inode = page->mapping->host;
85 char *kaddr = page_address(page);
86
87 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
88 kaddr + offset, to - offset);
89 mark_inode_dirty(inode);
90 SetPageUptodate(page);
91 kunmap(page);
92 /* only one page here */
93 if (to > inode->i_size)
94 inode->i_size = to;
95 return 0;
96}
97
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070098const struct address_space_operations udf_adinicb_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 .readpage = udf_adinicb_readpage,
100 .writepage = udf_adinicb_writepage,
101 .sync_page = block_sync_page,
102 .prepare_write = udf_adinicb_prepare_write,
103 .commit_write = udf_adinicb_commit_write,
104};
105
106static ssize_t udf_file_write(struct file * file, const char __user * buf,
107 size_t count, loff_t *ppos)
108{
109 ssize_t retval;
110 struct inode *inode = file->f_dentry->d_inode;
111 int err, pos;
112
113 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
114 {
115 if (file->f_flags & O_APPEND)
116 pos = inode->i_size;
117 else
118 pos = *ppos;
119
120 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
121 pos + count))
122 {
123 udf_expand_file_adinicb(inode, pos + count, &err);
124 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
125 {
126 udf_debug("udf_expand_adinicb: err=%d\n", err);
127 return err;
128 }
129 }
130 else
131 {
132 if (pos + count > inode->i_size)
133 UDF_I_LENALLOC(inode) = pos + count;
134 else
135 UDF_I_LENALLOC(inode) = inode->i_size;
136 }
137 }
138
139 retval = generic_file_write(file, buf, count, ppos);
140
141 if (retval > 0)
142 mark_inode_dirty(inode);
143 return retval;
144}
145
146/*
147 * udf_ioctl
148 *
149 * PURPOSE
150 * Issue an ioctl.
151 *
152 * DESCRIPTION
153 * Optional - sys_ioctl() will return -ENOTTY if this routine is not
154 * available, and the ioctl cannot be handled without filesystem help.
155 *
156 * sys_ioctl() handles these ioctls that apply only to regular files:
157 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
158 * These ioctls are also handled by sys_ioctl():
159 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
160 * All other ioctls are passed to the filesystem.
161 *
162 * Refer to sys_ioctl() in fs/ioctl.c
163 * sys_ioctl() -> .
164 *
165 * PRE-CONDITIONS
166 * inode Pointer to inode that ioctl was issued on.
167 * filp Pointer to file that ioctl was issued on.
168 * cmd The ioctl command.
169 * arg The ioctl argument [can be interpreted as a
170 * user-space pointer if desired].
171 *
172 * POST-CONDITIONS
173 * <return> Success (>=0) or an error code (<=0) that
174 * sys_ioctl() will return.
175 *
176 * HISTORY
177 * July 1, 1997 - Andrew E. Mileski
178 * Written, tested, and released.
179 */
180int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
181 unsigned long arg)
182{
183 int result = -EINVAL;
184
Christoph Hellwig8c744fb2005-11-08 21:35:04 -0800185 if ( file_permission(filp, MAY_READ) != 0 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 {
187 udf_debug("no permission to access inode %lu\n",
188 inode->i_ino);
189 return -EPERM;
190 }
191
192 if ( !arg )
193 {
194 udf_debug("invalid argument to udf_ioctl\n");
195 return -EINVAL;
196 }
197
198 switch (cmd)
199 {
200 case UDF_GETVOLIDENT:
201 return copy_to_user((char __user *)arg,
202 UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
203 case UDF_RELOCATE_BLOCKS:
204 {
205 long old, new;
206
207 if (!capable(CAP_SYS_ADMIN)) return -EACCES;
208 if (get_user(old, (long __user *)arg)) return -EFAULT;
209 if ((result = udf_relocate_blocks(inode->i_sb,
210 old, &new)) == 0)
211 result = put_user(new, (long __user *)arg);
212
213 return result;
214 }
215 case UDF_GETEASIZE:
216 result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
217 break;
218
219 case UDF_GETEABLOCK:
220 result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
221 UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
222 break;
223 }
224
225 return result;
226}
227
228/*
229 * udf_release_file
230 *
231 * PURPOSE
232 * Called when all references to the file are closed
233 *
234 * DESCRIPTION
235 * Discard prealloced blocks
236 *
237 * HISTORY
238 *
239 */
240static int udf_release_file(struct inode * inode, struct file * filp)
241{
242 if (filp->f_mode & FMODE_WRITE)
243 {
244 lock_kernel();
245 udf_discard_prealloc(inode);
246 unlock_kernel();
247 }
248 return 0;
249}
250
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800251const struct file_operations udf_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 .read = generic_file_read,
253 .ioctl = udf_ioctl,
254 .open = generic_file_open,
255 .mmap = generic_file_mmap,
256 .write = udf_file_write,
257 .release = udf_release_file,
258 .fsync = udf_fsync_file,
259 .sendfile = generic_file_sendfile,
260};
261
262struct inode_operations udf_file_inode_operations = {
263 .truncate = udf_truncate,
264};