GNU Linux-libre 5.19-rc6-gnu
[releases.git] / fs / affs / inode.c
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
18 struct 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                 fallthrough;
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) * 86400LL +
154                          be32_to_cpu(tail->change.mins) * 60 +
155                          be32_to_cpu(tail->change.ticks) / 50 +
156                          AFFS_EPOCH_DELTA) +
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
163 bad_inode:
164         affs_brelse(bh);
165         iget_failed(inode);
166         return ERR_PTR(-EIO);
167 }
168
169 int
170 affs_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
218 int
219 affs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry,
220                    struct iattr *attr)
221 {
222         struct inode *inode = d_inode(dentry);
223         int error;
224
225         pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
226
227         error = setattr_prepare(&init_user_ns, dentry, attr);
228         if (error)
229                 goto out;
230
231         if (((attr->ia_valid & ATTR_UID) &&
232               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
233             ((attr->ia_valid & ATTR_GID) &&
234               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
235             ((attr->ia_valid & ATTR_MODE) &&
236              (AFFS_SB(inode->i_sb)->s_flags &
237               (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
238                 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
239                         error = -EPERM;
240                 goto out;
241         }
242
243         if ((attr->ia_valid & ATTR_SIZE) &&
244             attr->ia_size != i_size_read(inode)) {
245                 error = inode_newsize_ok(inode, attr->ia_size);
246                 if (error)
247                         return error;
248
249                 truncate_setsize(inode, attr->ia_size);
250                 affs_truncate(inode);
251         }
252
253         setattr_copy(&init_user_ns, inode, attr);
254         mark_inode_dirty(inode);
255
256         if (attr->ia_valid & ATTR_MODE)
257                 affs_mode_to_prot(inode);
258 out:
259         return error;
260 }
261
262 void
263 affs_evict_inode(struct inode *inode)
264 {
265         unsigned long cache_page;
266         pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
267                  inode->i_ino, inode->i_nlink);
268         truncate_inode_pages_final(&inode->i_data);
269
270         if (!inode->i_nlink) {
271                 inode->i_size = 0;
272                 affs_truncate(inode);
273         }
274
275         invalidate_inode_buffers(inode);
276         clear_inode(inode);
277         affs_free_prealloc(inode);
278         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
279         if (cache_page) {
280                 pr_debug("freeing ext cache\n");
281                 AFFS_I(inode)->i_lc = NULL;
282                 AFFS_I(inode)->i_ac = NULL;
283                 free_page(cache_page);
284         }
285         affs_brelse(AFFS_I(inode)->i_ext_bh);
286         AFFS_I(inode)->i_ext_last = ~1;
287         AFFS_I(inode)->i_ext_bh = NULL;
288
289         if (!inode->i_nlink)
290                 affs_free_block(inode->i_sb, inode->i_ino);
291 }
292
293 struct inode *
294 affs_new_inode(struct inode *dir)
295 {
296         struct super_block      *sb = dir->i_sb;
297         struct inode            *inode;
298         u32                      block;
299         struct buffer_head      *bh;
300
301         if (!(inode = new_inode(sb)))
302                 goto err_inode;
303
304         if (!(block = affs_alloc_block(dir, dir->i_ino)))
305                 goto err_block;
306
307         bh = affs_getzeroblk(sb, block);
308         if (!bh)
309                 goto err_bh;
310         mark_buffer_dirty_inode(bh, inode);
311         affs_brelse(bh);
312
313         inode->i_uid     = current_fsuid();
314         inode->i_gid     = current_fsgid();
315         inode->i_ino     = block;
316         set_nlink(inode, 1);
317         inode->i_mtime   = inode->i_atime = inode->i_ctime = current_time(inode);
318         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
319         AFFS_I(inode)->i_blkcnt = 0;
320         AFFS_I(inode)->i_lc = NULL;
321         AFFS_I(inode)->i_lc_size = 0;
322         AFFS_I(inode)->i_lc_shift = 0;
323         AFFS_I(inode)->i_lc_mask = 0;
324         AFFS_I(inode)->i_ac = NULL;
325         AFFS_I(inode)->i_ext_bh = NULL;
326         AFFS_I(inode)->mmu_private = 0;
327         AFFS_I(inode)->i_protect = 0;
328         AFFS_I(inode)->i_lastalloc = 0;
329         AFFS_I(inode)->i_pa_cnt = 0;
330         AFFS_I(inode)->i_extcnt = 1;
331         AFFS_I(inode)->i_ext_last = ~1;
332
333         insert_inode_hash(inode);
334
335         return inode;
336
337 err_bh:
338         affs_free_block(sb, block);
339 err_block:
340         iput(inode);
341 err_inode:
342         return NULL;
343 }
344
345 /*
346  * Add an entry to a directory. Create the header block
347  * and insert it into the hash table.
348  */
349
350 int
351 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
352 {
353         struct super_block *sb = dir->i_sb;
354         struct buffer_head *inode_bh = NULL;
355         struct buffer_head *bh;
356         u32 block = 0;
357         int retval;
358
359         pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
360                  dir->i_ino, inode->i_ino, dentry, type);
361
362         retval = -EIO;
363         bh = affs_bread(sb, inode->i_ino);
364         if (!bh)
365                 goto done;
366
367         affs_lock_link(inode);
368         switch (type) {
369         case ST_LINKFILE:
370         case ST_LINKDIR:
371                 retval = -ENOSPC;
372                 block = affs_alloc_block(dir, dir->i_ino);
373                 if (!block)
374                         goto err;
375                 retval = -EIO;
376                 inode_bh = bh;
377                 bh = affs_getzeroblk(sb, block);
378                 if (!bh)
379                         goto err;
380                 break;
381         default:
382                 break;
383         }
384
385         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
386         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
387         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
388         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
389         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
390
391         if (inode_bh) {
392                 __be32 chain;
393                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
394                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
395                 AFFS_TAIL(sb, bh)->link_chain = chain;
396                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
397                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
398                 mark_buffer_dirty_inode(inode_bh, inode);
399                 set_nlink(inode, 2);
400                 ihold(inode);
401         }
402         affs_fix_checksum(sb, bh);
403         mark_buffer_dirty_inode(bh, inode);
404         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
405
406         affs_lock_dir(dir);
407         retval = affs_insert_hash(dir, bh);
408         mark_buffer_dirty_inode(bh, inode);
409         affs_unlock_dir(dir);
410         affs_unlock_link(inode);
411
412         d_instantiate(dentry, inode);
413 done:
414         affs_brelse(inode_bh);
415         affs_brelse(bh);
416         return retval;
417 err:
418         if (block)
419                 affs_free_block(sb, block);
420         affs_unlock_link(inode);
421         goto done;
422 }