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1/*
2 * file.c
3 *
4 * PURPOSE
5 * File handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * 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/uaccess.h>
31#include <linux/kernel.h>
32#include <linux/string.h> /* memset */
33#include <linux/capability.h>
34#include <linux/errno.h>
35#include <linux/pagemap.h>
36#include <linux/uio.h>
37
38#include "udf_i.h"
39#include "udf_sb.h"
40
41static void __udf_adinicb_readpage(struct page *page)
42{
43 struct inode *inode = page->mapping->host;
44 char *kaddr;
45 struct udf_inode_info *iinfo = UDF_I(inode);
46
47 kaddr = kmap(page);
48 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
49 memset(kaddr + inode->i_size, 0, PAGE_SIZE - inode->i_size);
50 flush_dcache_page(page);
51 SetPageUptodate(page);
52 kunmap(page);
53}
54
55static int udf_adinicb_readpage(struct file *file, struct page *page)
56{
57 BUG_ON(!PageLocked(page));
58 __udf_adinicb_readpage(page);
59 unlock_page(page);
60
61 return 0;
62}
63
64static int udf_adinicb_writepage(struct page *page,
65 struct writeback_control *wbc)
66{
67 struct inode *inode = page->mapping->host;
68 char *kaddr;
69 struct udf_inode_info *iinfo = UDF_I(inode);
70
71 BUG_ON(!PageLocked(page));
72
73 kaddr = kmap(page);
74 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
75 mark_inode_dirty(inode);
76 SetPageUptodate(page);
77 kunmap(page);
78 unlock_page(page);
79
80 return 0;
81}
82
83static int udf_adinicb_write_begin(struct file *file,
84 struct address_space *mapping, loff_t pos,
85 unsigned len, unsigned flags, struct page **pagep,
86 void **fsdata)
87{
88 struct page *page;
89
90 if (WARN_ON_ONCE(pos >= PAGE_SIZE))
91 return -EIO;
92 page = grab_cache_page_write_begin(mapping, 0, flags);
93 if (!page)
94 return -ENOMEM;
95 *pagep = page;
96
97 if (!PageUptodate(page))
98 __udf_adinicb_readpage(page);
99 return 0;
100}
101
102static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
103{
104 /* Fallback to buffered I/O. */
105 return 0;
106}
107
108static int udf_adinicb_write_end(struct file *file, struct address_space *mapping,
109 loff_t pos, unsigned len, unsigned copied,
110 struct page *page, void *fsdata)
111{
112 struct inode *inode = page->mapping->host;
113 loff_t last_pos = pos + copied;
114 if (last_pos > inode->i_size)
115 i_size_write(inode, last_pos);
116 set_page_dirty(page);
117 unlock_page(page);
118 put_page(page);
119 return copied;
120}
121
122const struct address_space_operations udf_adinicb_aops = {
123 .readpage = udf_adinicb_readpage,
124 .writepage = udf_adinicb_writepage,
125 .write_begin = udf_adinicb_write_begin,
126 .write_end = udf_adinicb_write_end,
127 .direct_IO = udf_adinicb_direct_IO,
128};
129
130static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
131{
132 ssize_t retval;
133 struct file *file = iocb->ki_filp;
134 struct inode *inode = file_inode(file);
135 struct udf_inode_info *iinfo = UDF_I(inode);
136 int err;
137
138 inode_lock(inode);
139
140 retval = generic_write_checks(iocb, from);
141 if (retval <= 0)
142 goto out;
143
144 down_write(&iinfo->i_data_sem);
145 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
146 loff_t end = iocb->ki_pos + iov_iter_count(from);
147
148 if (inode->i_sb->s_blocksize <
149 (udf_file_entry_alloc_offset(inode) + end)) {
150 err = udf_expand_file_adinicb(inode);
151 if (err) {
152 inode_unlock(inode);
153 udf_debug("udf_expand_adinicb: err=%d\n", err);
154 return err;
155 }
156 } else {
157 iinfo->i_lenAlloc = max(end, inode->i_size);
158 up_write(&iinfo->i_data_sem);
159 }
160 } else
161 up_write(&iinfo->i_data_sem);
162
163 retval = __generic_file_write_iter(iocb, from);
164out:
165 inode_unlock(inode);
166
167 if (retval > 0) {
168 mark_inode_dirty(inode);
169 retval = generic_write_sync(iocb, retval);
170 }
171
172 return retval;
173}
174
175long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
176{
177 struct inode *inode = file_inode(filp);
178 long old_block, new_block;
179 int result = -EINVAL;
180
181 if (inode_permission(inode, MAY_READ) != 0) {
182 udf_debug("no permission to access inode %lu\n", inode->i_ino);
183 result = -EPERM;
184 goto out;
185 }
186
187 if (!arg) {
188 udf_debug("invalid argument to udf_ioctl\n");
189 result = -EINVAL;
190 goto out;
191 }
192
193 switch (cmd) {
194 case UDF_GETVOLIDENT:
195 if (copy_to_user((char __user *)arg,
196 UDF_SB(inode->i_sb)->s_volume_ident, 32))
197 result = -EFAULT;
198 else
199 result = 0;
200 goto out;
201 case UDF_RELOCATE_BLOCKS:
202 if (!capable(CAP_SYS_ADMIN)) {
203 result = -EPERM;
204 goto out;
205 }
206 if (get_user(old_block, (long __user *)arg)) {
207 result = -EFAULT;
208 goto out;
209 }
210 result = udf_relocate_blocks(inode->i_sb,
211 old_block, &new_block);
212 if (result == 0)
213 result = put_user(new_block, (long __user *)arg);
214 goto out;
215 case UDF_GETEASIZE:
216 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
217 goto out;
218 case UDF_GETEABLOCK:
219 result = copy_to_user((char __user *)arg,
220 UDF_I(inode)->i_ext.i_data,
221 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
222 goto out;
223 }
224
225out:
226 return result;
227}
228
229static int udf_release_file(struct inode *inode, struct file *filp)
230{
231 if (filp->f_mode & FMODE_WRITE &&
232 atomic_read(&inode->i_writecount) == 1) {
233 /*
234 * Grab i_mutex to avoid races with writes changing i_size
235 * while we are running.
236 */
237 inode_lock(inode);
238 down_write(&UDF_I(inode)->i_data_sem);
239 udf_discard_prealloc(inode);
240 udf_truncate_tail_extent(inode);
241 up_write(&UDF_I(inode)->i_data_sem);
242 inode_unlock(inode);
243 }
244 return 0;
245}
246
247const struct file_operations udf_file_operations = {
248 .read_iter = generic_file_read_iter,
249 .unlocked_ioctl = udf_ioctl,
250 .open = generic_file_open,
251 .mmap = generic_file_mmap,
252 .write_iter = udf_file_write_iter,
253 .release = udf_release_file,
254 .fsync = generic_file_fsync,
255 .splice_read = generic_file_splice_read,
256 .llseek = generic_file_llseek,
257};
258
259static int udf_setattr(struct dentry *dentry, struct iattr *attr)
260{
261 struct inode *inode = d_inode(dentry);
262 int error;
263
264 error = setattr_prepare(dentry, attr);
265 if (error)
266 return error;
267
268 if ((attr->ia_valid & ATTR_SIZE) &&
269 attr->ia_size != i_size_read(inode)) {
270 error = udf_setsize(inode, attr->ia_size);
271 if (error)
272 return error;
273 }
274
275 setattr_copy(inode, attr);
276 mark_inode_dirty(inode);
277 return 0;
278}
279
280const struct inode_operations udf_file_inode_operations = {
281 .setattr = udf_setattr,
282};
1/*
2 * file.c
3 *
4 * PURPOSE
5 * File handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * 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 <asm/uaccess.h>
31#include <linux/kernel.h>
32#include <linux/string.h> /* memset */
33#include <linux/capability.h>
34#include <linux/errno.h>
35#include <linux/pagemap.h>
36#include <linux/buffer_head.h>
37#include <linux/aio.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 struct udf_inode_info *iinfo = UDF_I(inode);
47
48 BUG_ON(!PageLocked(page));
49
50 kaddr = kmap(page);
51 memset(kaddr, 0, PAGE_CACHE_SIZE);
52 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
53 flush_dcache_page(page);
54 SetPageUptodate(page);
55 kunmap(page);
56 unlock_page(page);
57
58 return 0;
59}
60
61static int udf_adinicb_writepage(struct page *page,
62 struct writeback_control *wbc)
63{
64 struct inode *inode = page->mapping->host;
65 char *kaddr;
66 struct udf_inode_info *iinfo = UDF_I(inode);
67
68 BUG_ON(!PageLocked(page));
69
70 kaddr = kmap(page);
71 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
72 mark_inode_dirty(inode);
73 SetPageUptodate(page);
74 kunmap(page);
75 unlock_page(page);
76
77 return 0;
78}
79
80static int udf_adinicb_write_end(struct file *file,
81 struct address_space *mapping,
82 loff_t pos, unsigned len, unsigned copied,
83 struct page *page, void *fsdata)
84{
85 struct inode *inode = mapping->host;
86 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
87 char *kaddr;
88 struct udf_inode_info *iinfo = UDF_I(inode);
89
90 kaddr = kmap_atomic(page, KM_USER0);
91 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
92 kaddr + offset, copied);
93 kunmap_atomic(kaddr, KM_USER0);
94
95 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
96}
97
98const struct address_space_operations udf_adinicb_aops = {
99 .readpage = udf_adinicb_readpage,
100 .writepage = udf_adinicb_writepage,
101 .write_begin = simple_write_begin,
102 .write_end = udf_adinicb_write_end,
103};
104
105static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
106 unsigned long nr_segs, loff_t ppos)
107{
108 ssize_t retval;
109 struct file *file = iocb->ki_filp;
110 struct inode *inode = file->f_path.dentry->d_inode;
111 int err, pos;
112 size_t count = iocb->ki_left;
113 struct udf_inode_info *iinfo = UDF_I(inode);
114
115 down_write(&iinfo->i_data_sem);
116 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
117 if (file->f_flags & O_APPEND)
118 pos = inode->i_size;
119 else
120 pos = ppos;
121
122 if (inode->i_sb->s_blocksize <
123 (udf_file_entry_alloc_offset(inode) +
124 pos + count)) {
125 err = udf_expand_file_adinicb(inode);
126 if (err) {
127 udf_debug("udf_expand_adinicb: err=%d\n", err);
128 up_write(&iinfo->i_data_sem);
129 return err;
130 }
131 } else {
132 if (pos + count > inode->i_size)
133 iinfo->i_lenAlloc = pos + count;
134 else
135 iinfo->i_lenAlloc = inode->i_size;
136 }
137 }
138 up_write(&iinfo->i_data_sem);
139
140 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
141 if (retval > 0)
142 mark_inode_dirty(inode);
143
144 return retval;
145}
146
147long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
148{
149 struct inode *inode = filp->f_dentry->d_inode;
150 long old_block, new_block;
151 int result = -EINVAL;
152
153 if (inode_permission(inode, MAY_READ) != 0) {
154 udf_debug("no permission to access inode %lu\n", inode->i_ino);
155 result = -EPERM;
156 goto out;
157 }
158
159 if (!arg) {
160 udf_debug("invalid argument to udf_ioctl\n");
161 result = -EINVAL;
162 goto out;
163 }
164
165 switch (cmd) {
166 case UDF_GETVOLIDENT:
167 if (copy_to_user((char __user *)arg,
168 UDF_SB(inode->i_sb)->s_volume_ident, 32))
169 result = -EFAULT;
170 else
171 result = 0;
172 goto out;
173 case UDF_RELOCATE_BLOCKS:
174 if (!capable(CAP_SYS_ADMIN)) {
175 result = -EACCES;
176 goto out;
177 }
178 if (get_user(old_block, (long __user *)arg)) {
179 result = -EFAULT;
180 goto out;
181 }
182 result = udf_relocate_blocks(inode->i_sb,
183 old_block, &new_block);
184 if (result == 0)
185 result = put_user(new_block, (long __user *)arg);
186 goto out;
187 case UDF_GETEASIZE:
188 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
189 goto out;
190 case UDF_GETEABLOCK:
191 result = copy_to_user((char __user *)arg,
192 UDF_I(inode)->i_ext.i_data,
193 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
194 goto out;
195 }
196
197out:
198 return result;
199}
200
201static int udf_release_file(struct inode *inode, struct file *filp)
202{
203 if (filp->f_mode & FMODE_WRITE) {
204 mutex_lock(&inode->i_mutex);
205 down_write(&UDF_I(inode)->i_data_sem);
206 udf_discard_prealloc(inode);
207 udf_truncate_tail_extent(inode);
208 up_write(&UDF_I(inode)->i_data_sem);
209 mutex_unlock(&inode->i_mutex);
210 }
211 return 0;
212}
213
214const struct file_operations udf_file_operations = {
215 .read = do_sync_read,
216 .aio_read = generic_file_aio_read,
217 .unlocked_ioctl = udf_ioctl,
218 .open = generic_file_open,
219 .mmap = generic_file_mmap,
220 .write = do_sync_write,
221 .aio_write = udf_file_aio_write,
222 .release = udf_release_file,
223 .fsync = generic_file_fsync,
224 .splice_read = generic_file_splice_read,
225 .llseek = generic_file_llseek,
226};
227
228static int udf_setattr(struct dentry *dentry, struct iattr *attr)
229{
230 struct inode *inode = dentry->d_inode;
231 int error;
232
233 error = inode_change_ok(inode, attr);
234 if (error)
235 return error;
236
237 if ((attr->ia_valid & ATTR_SIZE) &&
238 attr->ia_size != i_size_read(inode)) {
239 error = udf_setsize(inode, attr->ia_size);
240 if (error)
241 return error;
242 }
243
244 setattr_copy(inode, attr);
245 mark_inode_dirty(inode);
246 return 0;
247}
248
249const struct inode_operations udf_file_inode_operations = {
250 .setattr = udf_setattr,
251};