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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 down_write(&iinfo->i_data_sem);
148 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
149 if (file->f_flags & O_APPEND)
150 pos = inode->i_size;
151 else
152 pos = ppos;
153
154 if (inode->i_sb->s_blocksize <
155 (udf_file_entry_alloc_offset(inode) +
156 pos + count)) {
157 err = udf_expand_file_adinicb(inode);
158 if (err) {
159 udf_debug("udf_expand_adinicb: err=%d\n", err);
160 return err;
161 }
162 } else {
163 if (pos + count > inode->i_size)
164 iinfo->i_lenAlloc = pos + count;
165 else
166 iinfo->i_lenAlloc = inode->i_size;
167 up_write(&iinfo->i_data_sem);
168 }
169 } else
170 up_write(&iinfo->i_data_sem);
171
172 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
173 if (retval > 0)
174 mark_inode_dirty(inode);
175
176 return retval;
177}
178
179long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
180{
181 struct inode *inode = file_inode(filp);
182 long old_block, new_block;
183 int result = -EINVAL;
184
185 if (inode_permission(inode, MAY_READ) != 0) {
186 udf_debug("no permission to access inode %lu\n", inode->i_ino);
187 result = -EPERM;
188 goto out;
189 }
190
191 if (!arg) {
192 udf_debug("invalid argument to udf_ioctl\n");
193 result = -EINVAL;
194 goto out;
195 }
196
197 switch (cmd) {
198 case UDF_GETVOLIDENT:
199 if (copy_to_user((char __user *)arg,
200 UDF_SB(inode->i_sb)->s_volume_ident, 32))
201 result = -EFAULT;
202 else
203 result = 0;
204 goto out;
205 case UDF_RELOCATE_BLOCKS:
206 if (!capable(CAP_SYS_ADMIN)) {
207 result = -EPERM;
208 goto out;
209 }
210 if (get_user(old_block, (long __user *)arg)) {
211 result = -EFAULT;
212 goto out;
213 }
214 result = udf_relocate_blocks(inode->i_sb,
215 old_block, &new_block);
216 if (result == 0)
217 result = put_user(new_block, (long __user *)arg);
218 goto out;
219 case UDF_GETEASIZE:
220 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
221 goto out;
222 case UDF_GETEABLOCK:
223 result = copy_to_user((char __user *)arg,
224 UDF_I(inode)->i_ext.i_data,
225 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
226 goto out;
227 }
228
229out:
230 return result;
231}
232
233static int udf_release_file(struct inode *inode, struct file *filp)
234{
235 if (filp->f_mode & FMODE_WRITE) {
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 }
241 return 0;
242}
243
244const struct file_operations udf_file_operations = {
245 .read = do_sync_read,
246 .aio_read = generic_file_aio_read,
247 .unlocked_ioctl = udf_ioctl,
248 .open = generic_file_open,
249 .mmap = generic_file_mmap,
250 .write = do_sync_write,
251 .aio_write = udf_file_aio_write,
252 .release = udf_release_file,
253 .fsync = generic_file_fsync,
254 .splice_read = generic_file_splice_read,
255 .llseek = generic_file_llseek,
256};
257
258static int udf_setattr(struct dentry *dentry, struct iattr *attr)
259{
260 struct inode *inode = dentry->d_inode;
261 int error;
262
263 error = inode_change_ok(inode, attr);
264 if (error)
265 return error;
266
267 if ((attr->ia_valid & ATTR_SIZE) &&
268 attr->ia_size != i_size_read(inode)) {
269 error = udf_setsize(inode, attr->ia_size);
270 if (error)
271 return error;
272 }
273
274 setattr_copy(inode, attr);
275 mark_inode_dirty(inode);
276 return 0;
277}
278
279const struct inode_operations udf_file_inode_operations = {
280 .setattr = udf_setattr,
281};
282
