1
2
3
4
5
6
7#include <linux/buffer_head.h>
8#include <linux/writeback.h>
9#include "adfs.h"
10
11
12
13
14
15static int
16adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
17 int create)
18{
19 if (!create) {
20 if (block >= inode->i_blocks)
21 goto abort_toobig;
22
23 block = __adfs_block_map(inode->i_sb, ADFS_I(inode)->indaddr,
24 block);
25 if (block)
26 map_bh(bh, inode->i_sb, block);
27 return 0;
28 }
29
30 return -EIO;
31
32abort_toobig:
33 return 0;
34}
35
36static int adfs_writepage(struct page *page, struct writeback_control *wbc)
37{
38 return block_write_full_page(page, adfs_get_block, wbc);
39}
40
41static int adfs_readpage(struct file *file, struct page *page)
42{
43 return block_read_full_page(page, adfs_get_block);
44}
45
46static void adfs_write_failed(struct address_space *mapping, loff_t to)
47{
48 struct inode *inode = mapping->host;
49
50 if (to > inode->i_size)
51 truncate_pagecache(inode, inode->i_size);
52}
53
54static int adfs_write_begin(struct file *file, struct address_space *mapping,
55 loff_t pos, unsigned len, unsigned flags,
56 struct page **pagep, void **fsdata)
57{
58 int ret;
59
60 *pagep = NULL;
61 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
62 adfs_get_block,
63 &ADFS_I(mapping->host)->mmu_private);
64 if (unlikely(ret))
65 adfs_write_failed(mapping, pos + len);
66
67 return ret;
68}
69
70static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
71{
72 return generic_block_bmap(mapping, block, adfs_get_block);
73}
74
75static const struct address_space_operations adfs_aops = {
76 .set_page_dirty = __set_page_dirty_buffers,
77 .readpage = adfs_readpage,
78 .writepage = adfs_writepage,
79 .write_begin = adfs_write_begin,
80 .write_end = generic_write_end,
81 .bmap = _adfs_bmap
82};
83
84
85
86
87static umode_t
88adfs_atts2mode(struct super_block *sb, struct inode *inode)
89{
90 unsigned int attr = ADFS_I(inode)->attr;
91 umode_t mode, rmask;
92 struct adfs_sb_info *asb = ADFS_SB(sb);
93
94 if (attr & ADFS_NDA_DIRECTORY) {
95 mode = S_IRUGO & asb->s_owner_mask;
96 return S_IFDIR | S_IXUGO | mode;
97 }
98
99 switch (adfs_filetype(ADFS_I(inode)->loadaddr)) {
100 case 0xfc0:
101 return S_IFLNK|S_IRWXUGO;
102
103 case 0xfe6:
104 rmask = S_IRUGO | S_IXUGO;
105 break;
106
107 default:
108 rmask = S_IRUGO;
109 }
110
111 mode = S_IFREG;
112
113 if (attr & ADFS_NDA_OWNER_READ)
114 mode |= rmask & asb->s_owner_mask;
115
116 if (attr & ADFS_NDA_OWNER_WRITE)
117 mode |= S_IWUGO & asb->s_owner_mask;
118
119 if (attr & ADFS_NDA_PUBLIC_READ)
120 mode |= rmask & asb->s_other_mask;
121
122 if (attr & ADFS_NDA_PUBLIC_WRITE)
123 mode |= S_IWUGO & asb->s_other_mask;
124 return mode;
125}
126
127
128
129
130
131static int adfs_mode2atts(struct super_block *sb, struct inode *inode,
132 umode_t ia_mode)
133{
134 struct adfs_sb_info *asb = ADFS_SB(sb);
135 umode_t mode;
136 int attr;
137
138
139 if (S_ISLNK(inode->i_mode))
140 return ADFS_I(inode)->attr;
141
142
143 if (S_ISDIR(inode->i_mode))
144 return ADFS_NDA_DIRECTORY;
145
146 attr = 0;
147 mode = ia_mode & asb->s_owner_mask;
148 if (mode & S_IRUGO)
149 attr |= ADFS_NDA_OWNER_READ;
150 if (mode & S_IWUGO)
151 attr |= ADFS_NDA_OWNER_WRITE;
152
153 mode = ia_mode & asb->s_other_mask;
154 mode &= ~asb->s_owner_mask;
155 if (mode & S_IRUGO)
156 attr |= ADFS_NDA_PUBLIC_READ;
157 if (mode & S_IWUGO)
158 attr |= ADFS_NDA_PUBLIC_WRITE;
159
160 return attr;
161}
162
163static const s64 nsec_unix_epoch_diff_risc_os_epoch = 2208988800000000000LL;
164
165
166
167
168
169
170static void
171adfs_adfs2unix_time(struct timespec64 *tv, struct inode *inode)
172{
173 unsigned int high, low;
174
175
176
177 s64 nsec;
178
179 if (!adfs_inode_is_stamped(inode))
180 goto cur_time;
181
182 high = ADFS_I(inode)->loadaddr & 0xFF;
183 low = ADFS_I(inode)->execaddr;
184
185
186
187
188 nsec = (((s64) high << 32) | (s64) low) * 10000000;
189
190
191 if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
192 goto too_early;
193
194
195 nsec -= nsec_unix_epoch_diff_risc_os_epoch;
196
197 *tv = ns_to_timespec64(nsec);
198 return;
199
200 cur_time:
201 *tv = current_time(inode);
202 return;
203
204 too_early:
205 tv->tv_sec = tv->tv_nsec = 0;
206 return;
207}
208
209
210static void adfs_unix2adfs_time(struct inode *inode,
211 const struct timespec64 *ts)
212{
213 s64 cs, nsec = timespec64_to_ns(ts);
214
215
216 nsec += nsec_unix_epoch_diff_risc_os_epoch;
217
218
219 cs = div_s64(nsec, 10000000);
220
221 cs = clamp_t(s64, cs, 0, 0xffffffffff);
222
223 ADFS_I(inode)->loadaddr &= ~0xff;
224 ADFS_I(inode)->loadaddr |= (cs >> 32) & 0xff;
225 ADFS_I(inode)->execaddr = cs;
226}
227
228
229
230
231
232
233
234
235
236
237
238
239
240struct inode *
241adfs_iget(struct super_block *sb, struct object_info *obj)
242{
243 struct inode *inode;
244
245 inode = new_inode(sb);
246 if (!inode)
247 goto out;
248
249 inode->i_uid = ADFS_SB(sb)->s_uid;
250 inode->i_gid = ADFS_SB(sb)->s_gid;
251 inode->i_ino = obj->indaddr;
252 inode->i_size = obj->size;
253 set_nlink(inode, 2);
254 inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
255 sb->s_blocksize_bits;
256
257
258
259
260
261
262
263 ADFS_I(inode)->parent_id = obj->parent_id;
264 ADFS_I(inode)->indaddr = obj->indaddr;
265 ADFS_I(inode)->loadaddr = obj->loadaddr;
266 ADFS_I(inode)->execaddr = obj->execaddr;
267 ADFS_I(inode)->attr = obj->attr;
268
269 inode->i_mode = adfs_atts2mode(sb, inode);
270 adfs_adfs2unix_time(&inode->i_mtime, inode);
271 inode->i_atime = inode->i_mtime;
272 inode->i_ctime = inode->i_mtime;
273
274 if (S_ISDIR(inode->i_mode)) {
275 inode->i_op = &adfs_dir_inode_operations;
276 inode->i_fop = &adfs_dir_operations;
277 } else if (S_ISREG(inode->i_mode)) {
278 inode->i_op = &adfs_file_inode_operations;
279 inode->i_fop = &adfs_file_operations;
280 inode->i_mapping->a_ops = &adfs_aops;
281 ADFS_I(inode)->mmu_private = inode->i_size;
282 }
283
284 inode_fake_hash(inode);
285
286out:
287 return inode;
288}
289
290
291
292
293
294
295int
296adfs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry,
297 struct iattr *attr)
298{
299 struct inode *inode = d_inode(dentry);
300 struct super_block *sb = inode->i_sb;
301 unsigned int ia_valid = attr->ia_valid;
302 int error;
303
304 error = setattr_prepare(&init_user_ns, dentry, attr);
305
306
307
308
309
310 if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) ||
311 (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, ADFS_SB(sb)->s_gid)))
312 error = -EPERM;
313
314 if (error)
315 goto out;
316
317
318 if (ia_valid & ATTR_SIZE)
319 truncate_setsize(inode, attr->ia_size);
320
321 if (ia_valid & ATTR_MTIME && adfs_inode_is_stamped(inode)) {
322 adfs_unix2adfs_time(inode, &attr->ia_mtime);
323 adfs_adfs2unix_time(&inode->i_mtime, inode);
324 }
325
326
327
328
329
330 if (ia_valid & ATTR_ATIME)
331 inode->i_atime = attr->ia_atime;
332 if (ia_valid & ATTR_CTIME)
333 inode->i_ctime = attr->ia_ctime;
334 if (ia_valid & ATTR_MODE) {
335 ADFS_I(inode)->attr = adfs_mode2atts(sb, inode, attr->ia_mode);
336 inode->i_mode = adfs_atts2mode(sb, inode);
337 }
338
339
340
341
342
343 if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))
344 mark_inode_dirty(inode);
345out:
346 return error;
347}
348
349
350
351
352
353
354int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
355{
356 struct super_block *sb = inode->i_sb;
357 struct object_info obj;
358 int ret;
359
360 obj.indaddr = ADFS_I(inode)->indaddr;
361 obj.name_len = 0;
362 obj.parent_id = ADFS_I(inode)->parent_id;
363 obj.loadaddr = ADFS_I(inode)->loadaddr;
364 obj.execaddr = ADFS_I(inode)->execaddr;
365 obj.attr = ADFS_I(inode)->attr;
366 obj.size = inode->i_size;
367
368 ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
369 return ret;
370}
371