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28#include "udfdecl.h"
29#include <linux/fs.h>
30#include <linux/uaccess.h>
31#include <linux/kernel.h>
32#include <linux/string.h>
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) && len != PAGE_SIZE)
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 loff_t offset)
104{
105
106 return 0;
107}
108
109const struct address_space_operations udf_adinicb_aops = {
110 .readpage = udf_adinicb_readpage,
111 .writepage = udf_adinicb_writepage,
112 .write_begin = udf_adinicb_write_begin,
113 .write_end = simple_write_end,
114 .direct_IO = udf_adinicb_direct_IO,
115};
116
117static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
118{
119 ssize_t retval;
120 struct file *file = iocb->ki_filp;
121 struct inode *inode = file_inode(file);
122 struct udf_inode_info *iinfo = UDF_I(inode);
123 int err;
124
125 inode_lock(inode);
126
127 retval = generic_write_checks(iocb, from);
128 if (retval <= 0)
129 goto out;
130
131 down_write(&iinfo->i_data_sem);
132 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
133 loff_t end = iocb->ki_pos + iov_iter_count(from);
134
135 if (inode->i_sb->s_blocksize <
136 (udf_file_entry_alloc_offset(inode) + end)) {
137 err = udf_expand_file_adinicb(inode);
138 if (err) {
139 inode_unlock(inode);
140 udf_debug("udf_expand_adinicb: err=%d\n", err);
141 return err;
142 }
143 } else {
144 iinfo->i_lenAlloc = max(end, inode->i_size);
145 up_write(&iinfo->i_data_sem);
146 }
147 } else
148 up_write(&iinfo->i_data_sem);
149
150 retval = __generic_file_write_iter(iocb, from);
151out:
152 inode_unlock(inode);
153
154 if (retval > 0) {
155 mark_inode_dirty(inode);
156 err = generic_write_sync(file, iocb->ki_pos - retval, retval);
157 if (err < 0)
158 retval = err;
159 }
160
161 return retval;
162}
163
164long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
165{
166 struct inode *inode = file_inode(filp);
167 long old_block, new_block;
168 int result = -EINVAL;
169
170 if (inode_permission(inode, MAY_READ) != 0) {
171 udf_debug("no permission to access inode %lu\n", inode->i_ino);
172 result = -EPERM;
173 goto out;
174 }
175
176 if (!arg) {
177 udf_debug("invalid argument to udf_ioctl\n");
178 result = -EINVAL;
179 goto out;
180 }
181
182 switch (cmd) {
183 case UDF_GETVOLIDENT:
184 if (copy_to_user((char __user *)arg,
185 UDF_SB(inode->i_sb)->s_volume_ident, 32))
186 result = -EFAULT;
187 else
188 result = 0;
189 goto out;
190 case UDF_RELOCATE_BLOCKS:
191 if (!capable(CAP_SYS_ADMIN)) {
192 result = -EPERM;
193 goto out;
194 }
195 if (get_user(old_block, (long __user *)arg)) {
196 result = -EFAULT;
197 goto out;
198 }
199 result = udf_relocate_blocks(inode->i_sb,
200 old_block, &new_block);
201 if (result == 0)
202 result = put_user(new_block, (long __user *)arg);
203 goto out;
204 case UDF_GETEASIZE:
205 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
206 goto out;
207 case UDF_GETEABLOCK:
208 result = copy_to_user((char __user *)arg,
209 UDF_I(inode)->i_ext.i_data,
210 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
211 goto out;
212 }
213
214out:
215 return result;
216}
217
218static int udf_release_file(struct inode *inode, struct file *filp)
219{
220 if (filp->f_mode & FMODE_WRITE &&
221 atomic_read(&inode->i_writecount) == 1) {
222
223
224
225
226 inode_lock(inode);
227 down_write(&UDF_I(inode)->i_data_sem);
228 udf_discard_prealloc(inode);
229 udf_truncate_tail_extent(inode);
230 up_write(&UDF_I(inode)->i_data_sem);
231 inode_unlock(inode);
232 }
233 return 0;
234}
235
236const struct file_operations udf_file_operations = {
237 .read_iter = generic_file_read_iter,
238 .unlocked_ioctl = udf_ioctl,
239 .open = generic_file_open,
240 .mmap = generic_file_mmap,
241 .write_iter = udf_file_write_iter,
242 .release = udf_release_file,
243 .fsync = generic_file_fsync,
244 .splice_read = generic_file_splice_read,
245 .llseek = generic_file_llseek,
246};
247
248static int udf_setattr(struct dentry *dentry, struct iattr *attr)
249{
250 struct inode *inode = d_inode(dentry);
251 int error;
252
253 error = inode_change_ok(inode, attr);
254 if (error)
255 return error;
256
257 if ((attr->ia_valid & ATTR_SIZE) &&
258 attr->ia_size != i_size_read(inode)) {
259 error = udf_setsize(inode, attr->ia_size);
260 if (error)
261 return error;
262 }
263
264 setattr_copy(inode, attr);
265 mark_inode_dirty(inode);
266 return 0;
267}
268
269const struct inode_operations udf_file_inode_operations = {
270 .setattr = udf_setattr,
271};
272
