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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 <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 void __udf_adinicb_readpage(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 kaddr = kmap(page);
49 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
50 memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size);
51 flush_dcache_page(page);
52 SetPageUptodate(page);
53 kunmap(page);
54}
55
56static int udf_adinicb_readpage(struct file *file, struct page *page)
57{
58 BUG_ON(!PageLocked(page));
59 __udf_adinicb_readpage(page);
60 unlock_page(page);
61
62 return 0;
63}
64
65static int udf_adinicb_writepage(struct page *page,
66 struct writeback_control *wbc)
67{
68 struct inode *inode = page->mapping->host;
69 char *kaddr;
70 struct udf_inode_info *iinfo = UDF_I(inode);
71
72 BUG_ON(!PageLocked(page));
73
74 kaddr = kmap(page);
75 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
76 mark_inode_dirty(inode);
77 SetPageUptodate(page);
78 kunmap(page);
79 unlock_page(page);
80
81 return 0;
82}
83
84static int udf_adinicb_write_begin(struct file *file,
85 struct address_space *mapping, loff_t pos,
86 unsigned len, unsigned flags, struct page **pagep,
87 void **fsdata)
88{
89 struct page *page;
90
91 if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE))
92 return -EIO;
93 page = grab_cache_page_write_begin(mapping, 0, flags);
94 if (!page)
95 return -ENOMEM;
96 *pagep = page;
97
98 if (!PageUptodate(page) && len != PAGE_CACHE_SIZE)
99 __udf_adinicb_readpage(page);
100 return 0;
101}
102
103static int udf_adinicb_write_end(struct file *file,
104 struct address_space *mapping,
105 loff_t pos, unsigned len, unsigned copied,
106 struct page *page, void *fsdata)
107{
108 struct inode *inode = mapping->host;
109 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
110 char *kaddr;
111 struct udf_inode_info *iinfo = UDF_I(inode);
112
113 kaddr = kmap_atomic(page);
114 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
115 kaddr + offset, copied);
116 kunmap_atomic(kaddr);
117
118 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
119}
120
121static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
122 const struct iovec *iov,
123 loff_t offset, unsigned long nr_segs)
124{
125 /* Fallback to buffered I/O. */
126 return 0;
127}
128
129const struct address_space_operations udf_adinicb_aops = {
130 .readpage = udf_adinicb_readpage,
131 .writepage = udf_adinicb_writepage,
132 .write_begin = udf_adinicb_write_begin,
133 .write_end = udf_adinicb_write_end,
134 .direct_IO = udf_adinicb_direct_IO,
135};
136
137static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
138 unsigned long nr_segs, loff_t ppos)
139{
140 ssize_t retval;
141 struct file *file = iocb->ki_filp;
142 struct inode *inode = file_inode(file);
143 int err, pos;
144 size_t count = iocb->ki_nbytes;
145 struct udf_inode_info *iinfo = UDF_I(inode);
146
147 mutex_lock(&inode->i_mutex);
148 down_write(&iinfo->i_data_sem);
149 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
150 if (file->f_flags & O_APPEND)
151 pos = inode->i_size;
152 else
153 pos = ppos;
154
155 if (inode->i_sb->s_blocksize <
156 (udf_file_entry_alloc_offset(inode) +
157 pos + count)) {
158 err = udf_expand_file_adinicb(inode);
159 if (err) {
160 mutex_unlock(&inode->i_mutex);
161 udf_debug("udf_expand_adinicb: err=%d\n", err);
162 return err;
163 }
164 } else {
165 if (pos + count > inode->i_size)
166 iinfo->i_lenAlloc = pos + count;
167 else
168 iinfo->i_lenAlloc = inode->i_size;
169 up_write(&iinfo->i_data_sem);
170 }
171 } else
172 up_write(&iinfo->i_data_sem);
173
174 retval = __generic_file_aio_write(iocb, iov, nr_segs);
175 mutex_unlock(&inode->i_mutex);
176
177 if (retval > 0) {
178 ssize_t err;
179
180 mark_inode_dirty(inode);
181 err = generic_write_sync(file, iocb->ki_pos - retval, retval);
182 if (err < 0)
183 retval = err;
184 }
185
186 return retval;
187}
188
189long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
190{
191 struct inode *inode = file_inode(filp);
192 long old_block, new_block;
193 int result = -EINVAL;
194
195 if (inode_permission(inode, MAY_READ) != 0) {
196 udf_debug("no permission to access inode %lu\n", inode->i_ino);
197 result = -EPERM;
198 goto out;
199 }
200
201 if (!arg) {
202 udf_debug("invalid argument to udf_ioctl\n");
203 result = -EINVAL;
204 goto out;
205 }
206
207 switch (cmd) {
208 case UDF_GETVOLIDENT:
209 if (copy_to_user((char __user *)arg,
210 UDF_SB(inode->i_sb)->s_volume_ident, 32))
211 result = -EFAULT;
212 else
213 result = 0;
214 goto out;
215 case UDF_RELOCATE_BLOCKS:
216 if (!capable(CAP_SYS_ADMIN)) {
217 result = -EPERM;
218 goto out;
219 }
220 if (get_user(old_block, (long __user *)arg)) {
221 result = -EFAULT;
222 goto out;
223 }
224 result = udf_relocate_blocks(inode->i_sb,
225 old_block, &new_block);
226 if (result == 0)
227 result = put_user(new_block, (long __user *)arg);
228 goto out;
229 case UDF_GETEASIZE:
230 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
231 goto out;
232 case UDF_GETEABLOCK:
233 result = copy_to_user((char __user *)arg,
234 UDF_I(inode)->i_ext.i_data,
235 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
236 goto out;
237 }
238
239out:
240 return result;
241}
242
243static int udf_release_file(struct inode *inode, struct file *filp)
244{
245 if (filp->f_mode & FMODE_WRITE) {
246 down_write(&UDF_I(inode)->i_data_sem);
247 udf_discard_prealloc(inode);
248 udf_truncate_tail_extent(inode);
249 up_write(&UDF_I(inode)->i_data_sem);
250 }
251 return 0;
252}
253
254const struct file_operations udf_file_operations = {
255 .read = do_sync_read,
256 .aio_read = generic_file_aio_read,
257 .unlocked_ioctl = udf_ioctl,
258 .open = generic_file_open,
259 .mmap = generic_file_mmap,
260 .write = do_sync_write,
261 .aio_write = udf_file_aio_write,
262 .release = udf_release_file,
263 .fsync = generic_file_fsync,
264 .splice_read = generic_file_splice_read,
265 .llseek = generic_file_llseek,
266};
267
268static int udf_setattr(struct dentry *dentry, struct iattr *attr)
269{
270 struct inode *inode = dentry->d_inode;
271 int error;
272
273 error = inode_change_ok(inode, attr);
274 if (error)
275 return error;
276
277 if ((attr->ia_valid & ATTR_SIZE) &&
278 attr->ia_size != i_size_read(inode)) {
279 error = udf_setsize(inode, attr->ia_size);
280 if (error)
281 return error;
282 }
283
284 setattr_copy(inode, attr);
285 mark_inode_dirty(inode);
286 return 0;
287}
288
289const struct inode_operations udf_file_inode_operations = {
290 .setattr = udf_setattr,
291};
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 loff_t isize = i_size_read(inode);
47
48 /*
49 * We have to be careful here as truncate can change i_size under us.
50 * So just sample it once and use the same value everywhere.
51 */
52 kaddr = kmap_atomic(page);
53 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, isize);
54 memset(kaddr + isize, 0, PAGE_SIZE - isize);
55 flush_dcache_page(page);
56 SetPageUptodate(page);
57 kunmap_atomic(kaddr);
58}
59
60static int udf_adinicb_readpage(struct file *file, struct page *page)
61{
62 BUG_ON(!PageLocked(page));
63 __udf_adinicb_readpage(page);
64 unlock_page(page);
65
66 return 0;
67}
68
69static int udf_adinicb_writepage(struct page *page,
70 struct writeback_control *wbc)
71{
72 struct inode *inode = page->mapping->host;
73 char *kaddr;
74 struct udf_inode_info *iinfo = UDF_I(inode);
75
76 BUG_ON(!PageLocked(page));
77
78 kaddr = kmap_atomic(page);
79 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
80 i_size_read(inode));
81 SetPageUptodate(page);
82 kunmap_atomic(kaddr);
83 mark_inode_dirty(inode);
84 unlock_page(page);
85
86 return 0;
87}
88
89static int udf_adinicb_write_begin(struct file *file,
90 struct address_space *mapping, loff_t pos,
91 unsigned len, unsigned flags, struct page **pagep,
92 void **fsdata)
93{
94 struct page *page;
95
96 if (WARN_ON_ONCE(pos >= PAGE_SIZE))
97 return -EIO;
98 page = grab_cache_page_write_begin(mapping, 0, flags);
99 if (!page)
100 return -ENOMEM;
101 *pagep = page;
102
103 if (!PageUptodate(page))
104 __udf_adinicb_readpage(page);
105 return 0;
106}
107
108static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
109{
110 /* Fallback to buffered I/O. */
111 return 0;
112}
113
114static int udf_adinicb_write_end(struct file *file, struct address_space *mapping,
115 loff_t pos, unsigned len, unsigned copied,
116 struct page *page, void *fsdata)
117{
118 struct inode *inode = page->mapping->host;
119 loff_t last_pos = pos + copied;
120 if (last_pos > inode->i_size)
121 i_size_write(inode, last_pos);
122 set_page_dirty(page);
123 unlock_page(page);
124 put_page(page);
125 return copied;
126}
127
128const struct address_space_operations udf_adinicb_aops = {
129 .readpage = udf_adinicb_readpage,
130 .writepage = udf_adinicb_writepage,
131 .write_begin = udf_adinicb_write_begin,
132 .write_end = udf_adinicb_write_end,
133 .direct_IO = udf_adinicb_direct_IO,
134};
135
136static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
137{
138 ssize_t retval;
139 struct file *file = iocb->ki_filp;
140 struct inode *inode = file_inode(file);
141 struct udf_inode_info *iinfo = UDF_I(inode);
142 int err;
143
144 inode_lock(inode);
145
146 retval = generic_write_checks(iocb, from);
147 if (retval <= 0)
148 goto out;
149
150 down_write(&iinfo->i_data_sem);
151 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
152 loff_t end = iocb->ki_pos + iov_iter_count(from);
153
154 if (inode->i_sb->s_blocksize <
155 (udf_file_entry_alloc_offset(inode) + end)) {
156 err = udf_expand_file_adinicb(inode);
157 if (err) {
158 inode_unlock(inode);
159 udf_debug("udf_expand_adinicb: err=%d\n", err);
160 return err;
161 }
162 } else {
163 iinfo->i_lenAlloc = max(end, inode->i_size);
164 up_write(&iinfo->i_data_sem);
165 }
166 } else
167 up_write(&iinfo->i_data_sem);
168
169 retval = __generic_file_write_iter(iocb, from);
170out:
171 inode_unlock(inode);
172
173 if (retval > 0) {
174 mark_inode_dirty(inode);
175 retval = generic_write_sync(iocb, retval);
176 }
177
178 return retval;
179}
180
181long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
182{
183 struct inode *inode = file_inode(filp);
184 long old_block, new_block;
185 int result;
186
187 if (inode_permission(inode, MAY_READ) != 0) {
188 udf_debug("no permission to access inode %lu\n", inode->i_ino);
189 return -EPERM;
190 }
191
192 if (!arg && ((cmd == UDF_GETVOLIDENT) || (cmd == UDF_GETEASIZE) ||
193 (cmd == UDF_RELOCATE_BLOCKS) || (cmd == UDF_GETEABLOCK))) {
194 udf_debug("invalid argument to udf_ioctl\n");
195 return -EINVAL;
196 }
197
198 switch (cmd) {
199 case UDF_GETVOLIDENT:
200 if (copy_to_user((char __user *)arg,
201 UDF_SB(inode->i_sb)->s_volume_ident, 32))
202 return -EFAULT;
203 return 0;
204 case UDF_RELOCATE_BLOCKS:
205 if (!capable(CAP_SYS_ADMIN))
206 return -EPERM;
207 if (get_user(old_block, (long __user *)arg))
208 return -EFAULT;
209 result = udf_relocate_blocks(inode->i_sb,
210 old_block, &new_block);
211 if (result == 0)
212 result = put_user(new_block, (long __user *)arg);
213 return result;
214 case UDF_GETEASIZE:
215 return put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
216 case UDF_GETEABLOCK:
217 return copy_to_user((char __user *)arg,
218 UDF_I(inode)->i_ext.i_data,
219 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
220 default:
221 return -ENOIOCTLCMD;
222 }
223
224 return 0;
225}
226
227static int udf_release_file(struct inode *inode, struct file *filp)
228{
229 if (filp->f_mode & FMODE_WRITE &&
230 atomic_read(&inode->i_writecount) == 1) {
231 /*
232 * Grab i_mutex to avoid races with writes changing i_size
233 * while we are running.
234 */
235 inode_lock(inode);
236 down_write(&UDF_I(inode)->i_data_sem);
237 udf_discard_prealloc(inode);
238 udf_truncate_tail_extent(inode);
239 up_write(&UDF_I(inode)->i_data_sem);
240 inode_unlock(inode);
241 }
242 return 0;
243}
244
245const struct file_operations udf_file_operations = {
246 .read_iter = generic_file_read_iter,
247 .unlocked_ioctl = udf_ioctl,
248 .open = generic_file_open,
249 .mmap = generic_file_mmap,
250 .write_iter = udf_file_write_iter,
251 .release = udf_release_file,
252 .fsync = generic_file_fsync,
253 .splice_read = generic_file_splice_read,
254 .llseek = generic_file_llseek,
255};
256
257static int udf_setattr(struct dentry *dentry, struct iattr *attr)
258{
259 struct inode *inode = d_inode(dentry);
260 struct super_block *sb = inode->i_sb;
261 int error;
262
263 error = setattr_prepare(dentry, attr);
264 if (error)
265 return error;
266
267 if ((attr->ia_valid & ATTR_UID) &&
268 UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET) &&
269 !uid_eq(attr->ia_uid, UDF_SB(sb)->s_uid))
270 return -EPERM;
271 if ((attr->ia_valid & ATTR_GID) &&
272 UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET) &&
273 !gid_eq(attr->ia_gid, UDF_SB(sb)->s_gid))
274 return -EPERM;
275
276 if ((attr->ia_valid & ATTR_SIZE) &&
277 attr->ia_size != i_size_read(inode)) {
278 error = udf_setsize(inode, attr->ia_size);
279 if (error)
280 return error;
281 }
282
283 setattr_copy(inode, attr);
284 mark_inode_dirty(inode);
285 return 0;
286}
287
288const struct inode_operations udf_file_inode_operations = {
289 .setattr = udf_setattr,
290};