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28#include "udfdecl.h"
29#include <linux/fs.h>
30#include <asm/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/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
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};
292
