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defconfig: exynos9610: Re-add dropped Wi-Fi AP options lost
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / affs / inode.c
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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/affs/inode.c
4 *
5 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 *
7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 *
9 * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.
10 *
11 * (C) 1991 Linus Torvalds - minix filesystem
12 */
13#include <linux/sched.h>
14#include <linux/cred.h>
15#include <linux/gfp.h>
16#include "affs.h"
17
18struct inode *affs_iget(struct super_block *sb, unsigned long ino)
19{
20 struct affs_sb_info *sbi = AFFS_SB(sb);
21 struct buffer_head *bh;
22 struct affs_tail *tail;
23 struct inode *inode;
24 u32 block;
25 u32 size;
26 u32 prot;
27 u16 id;
28
29 inode = iget_locked(sb, ino);
30 if (!inode)
31 return ERR_PTR(-ENOMEM);
32 if (!(inode->i_state & I_NEW))
33 return inode;
34
35 pr_debug("affs_iget(%lu)\n", inode->i_ino);
36
37 block = inode->i_ino;
38 bh = affs_bread(sb, block);
39 if (!bh) {
40 affs_warning(sb, "read_inode", "Cannot read block %d", block);
41 goto bad_inode;
42 }
43 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
44 affs_warning(sb,"read_inode",
45 "Checksum or type (ptype=%d) error on inode %d",
46 AFFS_HEAD(bh)->ptype, block);
47 goto bad_inode;
48 }
49
50 tail = AFFS_TAIL(sb, bh);
51 prot = be32_to_cpu(tail->protect);
52
53 inode->i_size = 0;
54 set_nlink(inode, 1);
55 inode->i_mode = 0;
56 AFFS_I(inode)->i_extcnt = 1;
57 AFFS_I(inode)->i_ext_last = ~1;
58 AFFS_I(inode)->i_protect = prot;
59 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
60 AFFS_I(inode)->i_blkcnt = 0;
61 AFFS_I(inode)->i_lc = NULL;
62 AFFS_I(inode)->i_lc_size = 0;
63 AFFS_I(inode)->i_lc_shift = 0;
64 AFFS_I(inode)->i_lc_mask = 0;
65 AFFS_I(inode)->i_ac = NULL;
66 AFFS_I(inode)->i_ext_bh = NULL;
67 AFFS_I(inode)->mmu_private = 0;
68 AFFS_I(inode)->i_lastalloc = 0;
69 AFFS_I(inode)->i_pa_cnt = 0;
70
71 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
72 inode->i_mode = sbi->s_mode;
73 else
74 inode->i_mode = affs_prot_to_mode(prot);
75
76 id = be16_to_cpu(tail->uid);
77 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))
78 inode->i_uid = sbi->s_uid;
79 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
80 i_uid_write(inode, 0);
81 else
82 i_uid_write(inode, id);
83
84 id = be16_to_cpu(tail->gid);
85 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))
86 inode->i_gid = sbi->s_gid;
87 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
88 i_gid_write(inode, 0);
89 else
90 i_gid_write(inode, id);
91
92 switch (be32_to_cpu(tail->stype)) {
93 case ST_ROOT:
94 inode->i_uid = sbi->s_uid;
95 inode->i_gid = sbi->s_gid;
96 /* fall through */
97 case ST_USERDIR:
98 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
99 affs_test_opt(sbi->s_flags, SF_SETMODE)) {
100 if (inode->i_mode & S_IRUSR)
101 inode->i_mode |= S_IXUSR;
102 if (inode->i_mode & S_IRGRP)
103 inode->i_mode |= S_IXGRP;
104 if (inode->i_mode & S_IROTH)
105 inode->i_mode |= S_IXOTH;
106 inode->i_mode |= S_IFDIR;
107 } else
108 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
109 /* Maybe it should be controlled by mount parameter? */
110 //inode->i_mode |= S_ISVTX;
111 inode->i_op = &affs_dir_inode_operations;
112 inode->i_fop = &affs_dir_operations;
113 break;
114 case ST_LINKDIR:
115#if 0
116 affs_warning(sb, "read_inode", "inode is LINKDIR");
117 goto bad_inode;
118#else
119 inode->i_mode |= S_IFDIR;
120 /* ... and leave ->i_op and ->i_fop pointing to empty */
121 break;
122#endif
123 case ST_LINKFILE:
124 affs_warning(sb, "read_inode", "inode is LINKFILE");
125 goto bad_inode;
126 case ST_FILE:
127 size = be32_to_cpu(tail->size);
128 inode->i_mode |= S_IFREG;
129 AFFS_I(inode)->mmu_private = inode->i_size = size;
130 if (inode->i_size) {
131 AFFS_I(inode)->i_blkcnt = (size - 1) /
132 sbi->s_data_blksize + 1;
133 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
134 sbi->s_hashsize + 1;
135 }
136 if (tail->link_chain)
137 set_nlink(inode, 2);
138 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?
139 &affs_aops_ofs : &affs_aops;
140 inode->i_op = &affs_file_inode_operations;
141 inode->i_fop = &affs_file_operations;
142 break;
143 case ST_SOFTLINK:
144 inode->i_size = strlen((char *)AFFS_HEAD(bh)->table);
145 inode->i_mode |= S_IFLNK;
146 inode_nohighmem(inode);
147 inode->i_op = &affs_symlink_inode_operations;
148 inode->i_data.a_ops = &affs_symlink_aops;
149 break;
150 }
151
152 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
153 = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
154 be32_to_cpu(tail->change.mins) * 60 +
155 be32_to_cpu(tail->change.ticks) / 50 +
156 ((8 * 365 + 2) * 24 * 60 * 60)) +
157 sys_tz.tz_minuteswest * 60;
158 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
159 affs_brelse(bh);
160 unlock_new_inode(inode);
161 return inode;
162
163bad_inode:
164 affs_brelse(bh);
165 iget_failed(inode);
166 return ERR_PTR(-EIO);
167}
168
169int
170affs_write_inode(struct inode *inode, struct writeback_control *wbc)
171{
172 struct super_block *sb = inode->i_sb;
173 struct buffer_head *bh;
174 struct affs_tail *tail;
175 uid_t uid;
176 gid_t gid;
177
178 pr_debug("write_inode(%lu)\n", inode->i_ino);
179
180 if (!inode->i_nlink)
181 // possibly free block
182 return 0;
183 bh = affs_bread(sb, inode->i_ino);
184 if (!bh) {
185 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
186 return -EIO;
187 }
188 tail = AFFS_TAIL(sb, bh);
189 if (tail->stype == cpu_to_be32(ST_ROOT)) {
190 affs_secs_to_datestamp(inode->i_mtime.tv_sec,
191 &AFFS_ROOT_TAIL(sb, bh)->root_change);
192 } else {
193 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
194 tail->size = cpu_to_be32(inode->i_size);
195 affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change);
196 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
197 uid = i_uid_read(inode);
198 gid = i_gid_read(inode);
199 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
200 if (uid == 0 || uid == 0xFFFF)
201 uid = uid ^ ~0;
202 if (gid == 0 || gid == 0xFFFF)
203 gid = gid ^ ~0;
204 }
205 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
206 tail->uid = cpu_to_be16(uid);
207 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))
208 tail->gid = cpu_to_be16(gid);
209 }
210 }
211 affs_fix_checksum(sb, bh);
212 mark_buffer_dirty_inode(bh, inode);
213 affs_brelse(bh);
214 affs_free_prealloc(inode);
215 return 0;
216}
217
218int
219affs_notify_change(struct dentry *dentry, struct iattr *attr)
220{
221 struct inode *inode = d_inode(dentry);
222 int error;
223
224 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
225
226 error = setattr_prepare(dentry, attr);
227 if (error)
228 goto out;
229
230 if (((attr->ia_valid & ATTR_UID) &&
231 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
232 ((attr->ia_valid & ATTR_GID) &&
233 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
234 ((attr->ia_valid & ATTR_MODE) &&
235 (AFFS_SB(inode->i_sb)->s_flags &
236 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
237 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
238 error = -EPERM;
239 goto out;
240 }
241
242 if ((attr->ia_valid & ATTR_SIZE) &&
243 attr->ia_size != i_size_read(inode)) {
244 error = inode_newsize_ok(inode, attr->ia_size);
245 if (error)
246 return error;
247
248 truncate_setsize(inode, attr->ia_size);
249 affs_truncate(inode);
250 }
251
252 setattr_copy(inode, attr);
253 mark_inode_dirty(inode);
254
255 if (attr->ia_valid & ATTR_MODE)
256 affs_mode_to_prot(inode);
257out:
258 return error;
259}
260
261void
262affs_evict_inode(struct inode *inode)
263{
264 unsigned long cache_page;
265 pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
266 inode->i_ino, inode->i_nlink);
267 truncate_inode_pages_final(&inode->i_data);
268
269 if (!inode->i_nlink) {
270 inode->i_size = 0;
271 affs_truncate(inode);
272 }
273
274 invalidate_inode_buffers(inode);
275 clear_inode(inode);
276 affs_free_prealloc(inode);
277 cache_page = (unsigned long)AFFS_I(inode)->i_lc;
278 if (cache_page) {
279 pr_debug("freeing ext cache\n");
280 AFFS_I(inode)->i_lc = NULL;
281 AFFS_I(inode)->i_ac = NULL;
282 free_page(cache_page);
283 }
284 affs_brelse(AFFS_I(inode)->i_ext_bh);
285 AFFS_I(inode)->i_ext_last = ~1;
286 AFFS_I(inode)->i_ext_bh = NULL;
287
288 if (!inode->i_nlink)
289 affs_free_block(inode->i_sb, inode->i_ino);
290}
291
292struct inode *
293affs_new_inode(struct inode *dir)
294{
295 struct super_block *sb = dir->i_sb;
296 struct inode *inode;
297 u32 block;
298 struct buffer_head *bh;
299
300 if (!(inode = new_inode(sb)))
301 goto err_inode;
302
303 if (!(block = affs_alloc_block(dir, dir->i_ino)))
304 goto err_block;
305
306 bh = affs_getzeroblk(sb, block);
307 if (!bh)
308 goto err_bh;
309 mark_buffer_dirty_inode(bh, inode);
310 affs_brelse(bh);
311
312 inode->i_uid = current_fsuid();
313 inode->i_gid = current_fsgid();
314 inode->i_ino = block;
315 set_nlink(inode, 1);
316 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
317 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
318 AFFS_I(inode)->i_blkcnt = 0;
319 AFFS_I(inode)->i_lc = NULL;
320 AFFS_I(inode)->i_lc_size = 0;
321 AFFS_I(inode)->i_lc_shift = 0;
322 AFFS_I(inode)->i_lc_mask = 0;
323 AFFS_I(inode)->i_ac = NULL;
324 AFFS_I(inode)->i_ext_bh = NULL;
325 AFFS_I(inode)->mmu_private = 0;
326 AFFS_I(inode)->i_protect = 0;
327 AFFS_I(inode)->i_lastalloc = 0;
328 AFFS_I(inode)->i_pa_cnt = 0;
329 AFFS_I(inode)->i_extcnt = 1;
330 AFFS_I(inode)->i_ext_last = ~1;
331
332 insert_inode_hash(inode);
333
334 return inode;
335
336err_bh:
337 affs_free_block(sb, block);
338err_block:
339 iput(inode);
340err_inode:
341 return NULL;
342}
343
344/*
345 * Add an entry to a directory. Create the header block
346 * and insert it into the hash table.
347 */
348
349int
350affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
351{
352 struct super_block *sb = dir->i_sb;
353 struct buffer_head *inode_bh = NULL;
354 struct buffer_head *bh;
355 u32 block = 0;
356 int retval;
357
358 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
359 dir->i_ino, inode->i_ino, dentry, type);
360
361 retval = -EIO;
362 bh = affs_bread(sb, inode->i_ino);
363 if (!bh)
364 goto done;
365
366 affs_lock_link(inode);
367 switch (type) {
368 case ST_LINKFILE:
369 case ST_LINKDIR:
370 retval = -ENOSPC;
371 block = affs_alloc_block(dir, dir->i_ino);
372 if (!block)
373 goto err;
374 retval = -EIO;
375 inode_bh = bh;
376 bh = affs_getzeroblk(sb, block);
377 if (!bh)
378 goto err;
379 break;
380 default:
381 break;
382 }
383
384 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
385 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
386 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
387 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
388 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
389
390 if (inode_bh) {
391 __be32 chain;
392 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
393 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
394 AFFS_TAIL(sb, bh)->link_chain = chain;
395 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
396 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
397 mark_buffer_dirty_inode(inode_bh, inode);
398 set_nlink(inode, 2);
399 ihold(inode);
400 }
401 affs_fix_checksum(sb, bh);
402 mark_buffer_dirty_inode(bh, inode);
403 dentry->d_fsdata = (void *)(long)bh->b_blocknr;
404
405 affs_lock_dir(dir);
406 retval = affs_insert_hash(dir, bh);
407 mark_buffer_dirty_inode(bh, inode);
408 affs_unlock_dir(dir);
409 affs_unlock_link(inode);
410
411 d_instantiate(dentry, inode);
412done:
413 affs_brelse(inode_bh);
414 affs_brelse(bh);
415 return retval;
416err:
417 if (block)
418 affs_free_block(sb, block);
419 affs_unlock_link(inode);
420 goto done;
421}