blob: d81f2db7b0e3cc47fe445e1ce8486493250619d9 [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
Badari Pulavarty543ade12006-09-30 23:28:48 -0700106static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
107 unsigned long nr_segs, loff_t ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
109 ssize_t retval;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700110 struct file *file = iocb->ki_filp;
Josef Sipek5096e932006-12-08 02:37:44 -0800111 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 int err, pos;
Badari Pulavarty543ade12006-09-30 23:28:48 -0700113 size_t count = iocb->ki_left;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
116 {
117 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
122 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
123 pos + count))
124 {
125 udf_expand_file_adinicb(inode, pos + count, &err);
126 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
127 {
128 udf_debug("udf_expand_adinicb: err=%d\n", err);
129 return err;
130 }
131 }
132 else
133 {
134 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
143 if (retval > 0)
144 mark_inode_dirty(inode);
145 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,
183 unsigned long arg)
184{
185 int result = -EINVAL;
186
Christoph Hellwig8c744fb2005-11-08 21:35:04 -0800187 if ( file_permission(filp, MAY_READ) != 0 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 {
189 udf_debug("no permission to access inode %lu\n",
190 inode->i_ino);
191 return -EPERM;
192 }
193
194 if ( !arg )
195 {
196 udf_debug("invalid argument to udf_ioctl\n");
197 return -EINVAL;
198 }
199
200 switch (cmd)
201 {
202 case UDF_GETVOLIDENT:
203 return copy_to_user((char __user *)arg,
204 UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
205 case UDF_RELOCATE_BLOCKS:
206 {
207 long old, new;
208
209 if (!capable(CAP_SYS_ADMIN)) return -EACCES;
210 if (get_user(old, (long __user *)arg)) return -EFAULT;
211 if ((result = udf_relocate_blocks(inode->i_sb,
212 old, &new)) == 0)
213 result = put_user(new, (long __user *)arg);
214
215 return result;
216 }
217 case UDF_GETEASIZE:
218 result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
219 break;
220
221 case UDF_GETEABLOCK:
222 result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
223 UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
224 break;
225 }
226
227 return result;
228}
229
230/*
231 * udf_release_file
232 *
233 * PURPOSE
234 * Called when all references to the file are closed
235 *
236 * DESCRIPTION
237 * Discard prealloced blocks
238 *
239 * HISTORY
240 *
241 */
242static int udf_release_file(struct inode * inode, struct file * filp)
243{
244 if (filp->f_mode & FMODE_WRITE)
245 {
246 lock_kernel();
247 udf_discard_prealloc(inode);
248 unlock_kernel();
249 }
250 return 0;
251}
252
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800253const struct file_operations udf_file_operations = {
Badari Pulavarty543ade12006-09-30 23:28:48 -0700254 .read = do_sync_read,
255 .aio_read = generic_file_aio_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 .ioctl = udf_ioctl,
257 .open = generic_file_open,
258 .mmap = generic_file_mmap,
Badari Pulavarty543ade12006-09-30 23:28:48 -0700259 .write = do_sync_write,
260 .aio_write = udf_file_aio_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 .release = udf_release_file,
262 .fsync = udf_fsync_file,
263 .sendfile = generic_file_sendfile,
264};
265
266struct inode_operations udf_file_inode_operations = {
267 .truncate = udf_truncate,
268};