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Linux/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 
 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                 /* 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 
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 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);
257 out:
258         return error;
259 }
260 
261 void
262 affs_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 
292 struct inode *
293 affs_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 
336 err_bh:
337         affs_free_block(sb, block);
338 err_block:
339         iput(inode);
340 err_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 
349 int
350 affs_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);
412 done:
413         affs_brelse(inode_bh);
414         affs_brelse(bh);
415         return retval;
416 err:
417         if (block)
418                 affs_free_block(sb, block);
419         affs_unlock_link(inode);
420         goto done;
421 }
422 

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