blob: 8a388289040dbb66de764c8ccc92fdade27253eb [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 */
34#include <linux/errno.h>
35#include <linux/smp_lock.h>
36#include <linux/pagemap.h>
37#include <linux/buffer_head.h>
38
39#include "udf_i.h"
40#include "udf_sb.h"
41
42static int udf_adinicb_readpage(struct file *file, struct page * page)
43{
44 struct inode *inode = page->mapping->host;
45 char *kaddr;
46
Matt Mackallcd7619d2005-05-01 08:59:01 -070047 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49 kaddr = kmap(page);
50 memset(kaddr, 0, PAGE_CACHE_SIZE);
51 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
52 flush_dcache_page(page);
53 SetPageUptodate(page);
54 kunmap(page);
55 unlock_page(page);
56 return 0;
57}
58
59static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc)
60{
61 struct inode *inode = page->mapping->host;
62 char *kaddr;
63
Matt Mackallcd7619d2005-05-01 08:59:01 -070064 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66 kaddr = kmap(page);
67 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
68 mark_inode_dirty(inode);
69 SetPageUptodate(page);
70 kunmap(page);
71 unlock_page(page);
72 return 0;
73}
74
75static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
76{
77 kmap(page);
78 return 0;
79}
80
81static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
82{
83 struct inode *inode = page->mapping->host;
84 char *kaddr = page_address(page);
85
86 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
87 kaddr + offset, to - offset);
88 mark_inode_dirty(inode);
89 SetPageUptodate(page);
90 kunmap(page);
91 /* only one page here */
92 if (to > inode->i_size)
93 inode->i_size = to;
94 return 0;
95}
96
97struct address_space_operations udf_adinicb_aops = {
98 .readpage = udf_adinicb_readpage,
99 .writepage = udf_adinicb_writepage,
100 .sync_page = block_sync_page,
101 .prepare_write = udf_adinicb_prepare_write,
102 .commit_write = udf_adinicb_commit_write,
103};
104
105static ssize_t udf_file_write(struct file * file, const char __user * buf,
106 size_t count, loff_t *ppos)
107{
108 ssize_t retval;
109 struct inode *inode = file->f_dentry->d_inode;
110 int err, pos;
111
112 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
113 {
114 if (file->f_flags & O_APPEND)
115 pos = inode->i_size;
116 else
117 pos = *ppos;
118
119 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
120 pos + count))
121 {
122 udf_expand_file_adinicb(inode, pos + count, &err);
123 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
124 {
125 udf_debug("udf_expand_adinicb: err=%d\n", err);
126 return err;
127 }
128 }
129 else
130 {
131 if (pos + count > inode->i_size)
132 UDF_I_LENALLOC(inode) = pos + count;
133 else
134 UDF_I_LENALLOC(inode) = inode->i_size;
135 }
136 }
137
138 retval = generic_file_write(file, buf, count, ppos);
139
140 if (retval > 0)
141 mark_inode_dirty(inode);
142 return retval;
143}
144
145/*
146 * udf_ioctl
147 *
148 * PURPOSE
149 * Issue an ioctl.
150 *
151 * DESCRIPTION
152 * Optional - sys_ioctl() will return -ENOTTY if this routine is not
153 * available, and the ioctl cannot be handled without filesystem help.
154 *
155 * sys_ioctl() handles these ioctls that apply only to regular files:
156 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
157 * These ioctls are also handled by sys_ioctl():
158 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
159 * All other ioctls are passed to the filesystem.
160 *
161 * Refer to sys_ioctl() in fs/ioctl.c
162 * sys_ioctl() -> .
163 *
164 * PRE-CONDITIONS
165 * inode Pointer to inode that ioctl was issued on.
166 * filp Pointer to file that ioctl was issued on.
167 * cmd The ioctl command.
168 * arg The ioctl argument [can be interpreted as a
169 * user-space pointer if desired].
170 *
171 * POST-CONDITIONS
172 * <return> Success (>=0) or an error code (<=0) that
173 * sys_ioctl() will return.
174 *
175 * HISTORY
176 * July 1, 1997 - Andrew E. Mileski
177 * Written, tested, and released.
178 */
179int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
180 unsigned long arg)
181{
182 int result = -EINVAL;
183
Christoph Hellwig8c744fb2005-11-08 21:35:04 -0800184 if ( file_permission(filp, MAY_READ) != 0 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 {
186 udf_debug("no permission to access inode %lu\n",
187 inode->i_ino);
188 return -EPERM;
189 }
190
191 if ( !arg )
192 {
193 udf_debug("invalid argument to udf_ioctl\n");
194 return -EINVAL;
195 }
196
197 switch (cmd)
198 {
199 case UDF_GETVOLIDENT:
200 return copy_to_user((char __user *)arg,
201 UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
202 case UDF_RELOCATE_BLOCKS:
203 {
204 long old, new;
205
206 if (!capable(CAP_SYS_ADMIN)) return -EACCES;
207 if (get_user(old, (long __user *)arg)) return -EFAULT;
208 if ((result = udf_relocate_blocks(inode->i_sb,
209 old, &new)) == 0)
210 result = put_user(new, (long __user *)arg);
211
212 return result;
213 }
214 case UDF_GETEASIZE:
215 result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
216 break;
217
218 case UDF_GETEABLOCK:
219 result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
220 UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
221 break;
222 }
223
224 return result;
225}
226
227/*
228 * udf_release_file
229 *
230 * PURPOSE
231 * Called when all references to the file are closed
232 *
233 * DESCRIPTION
234 * Discard prealloced blocks
235 *
236 * HISTORY
237 *
238 */
239static int udf_release_file(struct inode * inode, struct file * filp)
240{
241 if (filp->f_mode & FMODE_WRITE)
242 {
243 lock_kernel();
244 udf_discard_prealloc(inode);
245 unlock_kernel();
246 }
247 return 0;
248}
249
250struct file_operations udf_file_operations = {
251 .read = generic_file_read,
252 .ioctl = udf_ioctl,
253 .open = generic_file_open,
254 .mmap = generic_file_mmap,
255 .write = udf_file_write,
256 .release = udf_release_file,
257 .fsync = udf_fsync_file,
258 .sendfile = generic_file_sendfile,
259};
260
261struct inode_operations udf_file_inode_operations = {
262 .truncate = udf_truncate,
263};