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TOMOYO Linux Cross Reference
Linux/fs/hfsplus/dir.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/fs/hfsplus/dir.c
  4  *
  5  * Copyright (C) 2001
  6  * Brad Boyer (flar@allandria.com)
  7  * (C) 2003 Ardis Technologies <roman@ardistech.com>
  8  *
  9  * Handling of directories
 10  */
 11 
 12 #include <linux/errno.h>
 13 #include <linux/fs.h>
 14 #include <linux/slab.h>
 15 #include <linux/random.h>
 16 #include <linux/nls.h>
 17 
 18 #include "hfsplus_fs.h"
 19 #include "hfsplus_raw.h"
 20 #include "xattr.h"
 21 #include "acl.h"
 22 
 23 static inline void hfsplus_instantiate(struct dentry *dentry,
 24                                        struct inode *inode, u32 cnid)
 25 {
 26         dentry->d_fsdata = (void *)(unsigned long)cnid;
 27         d_instantiate(dentry, inode);
 28 }
 29 
 30 /* Find the entry inside dir named dentry->d_name */
 31 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
 32                                      unsigned int flags)
 33 {
 34         struct inode *inode = NULL;
 35         struct hfs_find_data fd;
 36         struct super_block *sb;
 37         hfsplus_cat_entry entry;
 38         int err;
 39         u32 cnid, linkid = 0;
 40         u16 type;
 41 
 42         sb = dir->i_sb;
 43 
 44         dentry->d_fsdata = NULL;
 45         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 46         if (err)
 47                 return ERR_PTR(err);
 48         err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
 49                         &dentry->d_name);
 50         if (unlikely(err < 0))
 51                 goto fail;
 52 again:
 53         err = hfs_brec_read(&fd, &entry, sizeof(entry));
 54         if (err) {
 55                 if (err == -ENOENT) {
 56                         hfs_find_exit(&fd);
 57                         /* No such entry */
 58                         inode = NULL;
 59                         goto out;
 60                 }
 61                 goto fail;
 62         }
 63         type = be16_to_cpu(entry.type);
 64         if (type == HFSPLUS_FOLDER) {
 65                 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
 66                         err = -EIO;
 67                         goto fail;
 68                 }
 69                 cnid = be32_to_cpu(entry.folder.id);
 70                 dentry->d_fsdata = (void *)(unsigned long)cnid;
 71         } else if (type == HFSPLUS_FILE) {
 72                 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
 73                         err = -EIO;
 74                         goto fail;
 75                 }
 76                 cnid = be32_to_cpu(entry.file.id);
 77                 if (entry.file.user_info.fdType ==
 78                                 cpu_to_be32(HFSP_HARDLINK_TYPE) &&
 79                                 entry.file.user_info.fdCreator ==
 80                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
 81                                 (entry.file.create_date ==
 82                                         HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
 83                                                 create_date ||
 84                                 entry.file.create_date ==
 85                                         HFSPLUS_I(d_inode(sb->s_root))->
 86                                                 create_date) &&
 87                                 HFSPLUS_SB(sb)->hidden_dir) {
 88                         struct qstr str;
 89                         char name[32];
 90 
 91                         if (dentry->d_fsdata) {
 92                                 /*
 93                                  * We found a link pointing to another link,
 94                                  * so ignore it and treat it as regular file.
 95                                  */
 96                                 cnid = (unsigned long)dentry->d_fsdata;
 97                                 linkid = 0;
 98                         } else {
 99                                 dentry->d_fsdata = (void *)(unsigned long)cnid;
100                                 linkid =
101                                         be32_to_cpu(entry.file.permissions.dev);
102                                 str.len = sprintf(name, "iNode%d", linkid);
103                                 str.name = name;
104                                 err = hfsplus_cat_build_key(sb, fd.search_key,
105                                         HFSPLUS_SB(sb)->hidden_dir->i_ino,
106                                         &str);
107                                 if (unlikely(err < 0))
108                                         goto fail;
109                                 goto again;
110                         }
111                 } else if (!dentry->d_fsdata)
112                         dentry->d_fsdata = (void *)(unsigned long)cnid;
113         } else {
114                 pr_err("invalid catalog entry type in lookup\n");
115                 err = -EIO;
116                 goto fail;
117         }
118         hfs_find_exit(&fd);
119         inode = hfsplus_iget(dir->i_sb, cnid);
120         if (IS_ERR(inode))
121                 return ERR_CAST(inode);
122         if (S_ISREG(inode->i_mode))
123                 HFSPLUS_I(inode)->linkid = linkid;
124 out:
125         d_add(dentry, inode);
126         return NULL;
127 fail:
128         hfs_find_exit(&fd);
129         return ERR_PTR(err);
130 }
131 
132 static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
133 {
134         struct inode *inode = file_inode(file);
135         struct super_block *sb = inode->i_sb;
136         int len, err;
137         char *strbuf;
138         hfsplus_cat_entry entry;
139         struct hfs_find_data fd;
140         struct hfsplus_readdir_data *rd;
141         u16 type;
142 
143         if (file->f_pos >= inode->i_size)
144                 return 0;
145 
146         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
147         if (err)
148                 return err;
149         strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
150         if (!strbuf) {
151                 err = -ENOMEM;
152                 goto out;
153         }
154         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
155         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
156         if (err)
157                 goto out;
158 
159         if (ctx->pos == 0) {
160                 /* This is completely artificial... */
161                 if (!dir_emit_dot(file, ctx))
162                         goto out;
163                 ctx->pos = 1;
164         }
165         if (ctx->pos == 1) {
166                 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
167                         err = -EIO;
168                         goto out;
169                 }
170 
171                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
172                         fd.entrylength);
173                 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
174                         pr_err("bad catalog folder thread\n");
175                         err = -EIO;
176                         goto out;
177                 }
178                 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
179                         pr_err("truncated catalog thread\n");
180                         err = -EIO;
181                         goto out;
182                 }
183                 if (!dir_emit(ctx, "..", 2,
184                             be32_to_cpu(entry.thread.parentID), DT_DIR))
185                         goto out;
186                 ctx->pos = 2;
187         }
188         if (ctx->pos >= inode->i_size)
189                 goto out;
190         err = hfs_brec_goto(&fd, ctx->pos - 1);
191         if (err)
192                 goto out;
193         for (;;) {
194                 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
195                         pr_err("walked past end of dir\n");
196                         err = -EIO;
197                         goto out;
198                 }
199 
200                 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
201                         err = -EIO;
202                         goto out;
203                 }
204 
205                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
206                         fd.entrylength);
207                 type = be16_to_cpu(entry.type);
208                 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
209                 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
210                 if (err)
211                         goto out;
212                 if (type == HFSPLUS_FOLDER) {
213                         if (fd.entrylength <
214                                         sizeof(struct hfsplus_cat_folder)) {
215                                 pr_err("small dir entry\n");
216                                 err = -EIO;
217                                 goto out;
218                         }
219                         if (HFSPLUS_SB(sb)->hidden_dir &&
220                             HFSPLUS_SB(sb)->hidden_dir->i_ino ==
221                                         be32_to_cpu(entry.folder.id))
222                                 goto next;
223                         if (!dir_emit(ctx, strbuf, len,
224                                     be32_to_cpu(entry.folder.id), DT_DIR))
225                                 break;
226                 } else if (type == HFSPLUS_FILE) {
227                         u16 mode;
228                         unsigned type = DT_UNKNOWN;
229 
230                         if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
231                                 pr_err("small file entry\n");
232                                 err = -EIO;
233                                 goto out;
234                         }
235 
236                         mode = be16_to_cpu(entry.file.permissions.mode);
237                         if (S_ISREG(mode))
238                                 type = DT_REG;
239                         else if (S_ISLNK(mode))
240                                 type = DT_LNK;
241                         else if (S_ISFIFO(mode))
242                                 type = DT_FIFO;
243                         else if (S_ISCHR(mode))
244                                 type = DT_CHR;
245                         else if (S_ISBLK(mode))
246                                 type = DT_BLK;
247                         else if (S_ISSOCK(mode))
248                                 type = DT_SOCK;
249 
250                         if (!dir_emit(ctx, strbuf, len,
251                                       be32_to_cpu(entry.file.id), type))
252                                 break;
253                 } else {
254                         pr_err("bad catalog entry type\n");
255                         err = -EIO;
256                         goto out;
257                 }
258 next:
259                 ctx->pos++;
260                 if (ctx->pos >= inode->i_size)
261                         goto out;
262                 err = hfs_brec_goto(&fd, 1);
263                 if (err)
264                         goto out;
265         }
266         rd = file->private_data;
267         if (!rd) {
268                 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
269                 if (!rd) {
270                         err = -ENOMEM;
271                         goto out;
272                 }
273                 file->private_data = rd;
274                 rd->file = file;
275                 spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
276                 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
277                 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
278         }
279         /*
280          * Can be done after the list insertion; exclusion with
281          * hfsplus_delete_cat() is provided by directory lock.
282          */
283         memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
284 out:
285         kfree(strbuf);
286         hfs_find_exit(&fd);
287         return err;
288 }
289 
290 static int hfsplus_dir_release(struct inode *inode, struct file *file)
291 {
292         struct hfsplus_readdir_data *rd = file->private_data;
293         if (rd) {
294                 spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
295                 list_del(&rd->list);
296                 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
297                 kfree(rd);
298         }
299         return 0;
300 }
301 
302 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
303                         struct dentry *dst_dentry)
304 {
305         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
306         struct inode *inode = d_inode(src_dentry);
307         struct inode *src_dir = d_inode(src_dentry->d_parent);
308         struct qstr str;
309         char name[32];
310         u32 cnid, id;
311         int res;
312 
313         if (HFSPLUS_IS_RSRC(inode))
314                 return -EPERM;
315         if (!S_ISREG(inode->i_mode))
316                 return -EPERM;
317 
318         mutex_lock(&sbi->vh_mutex);
319         if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
320                 for (;;) {
321                         get_random_bytes(&id, sizeof(cnid));
322                         id &= 0x3fffffff;
323                         str.name = name;
324                         str.len = sprintf(name, "iNode%d", id);
325                         res = hfsplus_rename_cat(inode->i_ino,
326                                                  src_dir, &src_dentry->d_name,
327                                                  sbi->hidden_dir, &str);
328                         if (!res)
329                                 break;
330                         if (res != -EEXIST)
331                                 goto out;
332                 }
333                 HFSPLUS_I(inode)->linkid = id;
334                 cnid = sbi->next_cnid++;
335                 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
336                 res = hfsplus_create_cat(cnid, src_dir,
337                         &src_dentry->d_name, inode);
338                 if (res)
339                         /* panic? */
340                         goto out;
341                 sbi->file_count++;
342         }
343         cnid = sbi->next_cnid++;
344         res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
345         if (res)
346                 goto out;
347 
348         inc_nlink(inode);
349         hfsplus_instantiate(dst_dentry, inode, cnid);
350         ihold(inode);
351         inode->i_ctime = current_time(inode);
352         mark_inode_dirty(inode);
353         sbi->file_count++;
354         hfsplus_mark_mdb_dirty(dst_dir->i_sb);
355 out:
356         mutex_unlock(&sbi->vh_mutex);
357         return res;
358 }
359 
360 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
361 {
362         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
363         struct inode *inode = d_inode(dentry);
364         struct qstr str;
365         char name[32];
366         u32 cnid;
367         int res;
368 
369         if (HFSPLUS_IS_RSRC(inode))
370                 return -EPERM;
371 
372         mutex_lock(&sbi->vh_mutex);
373         cnid = (u32)(unsigned long)dentry->d_fsdata;
374         if (inode->i_ino == cnid &&
375             atomic_read(&HFSPLUS_I(inode)->opencnt)) {
376                 str.name = name;
377                 str.len = sprintf(name, "temp%lu", inode->i_ino);
378                 res = hfsplus_rename_cat(inode->i_ino,
379                                          dir, &dentry->d_name,
380                                          sbi->hidden_dir, &str);
381                 if (!res) {
382                         inode->i_flags |= S_DEAD;
383                         drop_nlink(inode);
384                 }
385                 goto out;
386         }
387         res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
388         if (res)
389                 goto out;
390 
391         if (inode->i_nlink > 0)
392                 drop_nlink(inode);
393         if (inode->i_ino == cnid)
394                 clear_nlink(inode);
395         if (!inode->i_nlink) {
396                 if (inode->i_ino != cnid) {
397                         sbi->file_count--;
398                         if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
399                                 res = hfsplus_delete_cat(inode->i_ino,
400                                                          sbi->hidden_dir,
401                                                          NULL);
402                                 if (!res)
403                                         hfsplus_delete_inode(inode);
404                         } else
405                                 inode->i_flags |= S_DEAD;
406                 } else
407                         hfsplus_delete_inode(inode);
408         } else
409                 sbi->file_count--;
410         inode->i_ctime = current_time(inode);
411         mark_inode_dirty(inode);
412 out:
413         mutex_unlock(&sbi->vh_mutex);
414         return res;
415 }
416 
417 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
418 {
419         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
420         struct inode *inode = d_inode(dentry);
421         int res;
422 
423         if (inode->i_size != 2)
424                 return -ENOTEMPTY;
425 
426         mutex_lock(&sbi->vh_mutex);
427         res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
428         if (res)
429                 goto out;
430         clear_nlink(inode);
431         inode->i_ctime = current_time(inode);
432         hfsplus_delete_inode(inode);
433         mark_inode_dirty(inode);
434 out:
435         mutex_unlock(&sbi->vh_mutex);
436         return res;
437 }
438 
439 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
440                            const char *symname)
441 {
442         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
443         struct inode *inode;
444         int res = -ENOMEM;
445 
446         mutex_lock(&sbi->vh_mutex);
447         inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO);
448         if (!inode)
449                 goto out;
450 
451         res = page_symlink(inode, symname, strlen(symname) + 1);
452         if (res)
453                 goto out_err;
454 
455         res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
456         if (res)
457                 goto out_err;
458 
459         res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
460         if (res == -EOPNOTSUPP)
461                 res = 0; /* Operation is not supported. */
462         else if (res) {
463                 /* Try to delete anyway without error analysis. */
464                 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
465                 goto out_err;
466         }
467 
468         hfsplus_instantiate(dentry, inode, inode->i_ino);
469         mark_inode_dirty(inode);
470         goto out;
471 
472 out_err:
473         clear_nlink(inode);
474         hfsplus_delete_inode(inode);
475         iput(inode);
476 out:
477         mutex_unlock(&sbi->vh_mutex);
478         return res;
479 }
480 
481 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
482                          umode_t mode, dev_t rdev)
483 {
484         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
485         struct inode *inode;
486         int res = -ENOMEM;
487 
488         mutex_lock(&sbi->vh_mutex);
489         inode = hfsplus_new_inode(dir->i_sb, dir, mode);
490         if (!inode)
491                 goto out;
492 
493         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
494                 init_special_inode(inode, mode, rdev);
495 
496         res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
497         if (res)
498                 goto failed_mknod;
499 
500         res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
501         if (res == -EOPNOTSUPP)
502                 res = 0; /* Operation is not supported. */
503         else if (res) {
504                 /* Try to delete anyway without error analysis. */
505                 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
506                 goto failed_mknod;
507         }
508 
509         hfsplus_instantiate(dentry, inode, inode->i_ino);
510         mark_inode_dirty(inode);
511         goto out;
512 
513 failed_mknod:
514         clear_nlink(inode);
515         hfsplus_delete_inode(inode);
516         iput(inode);
517 out:
518         mutex_unlock(&sbi->vh_mutex);
519         return res;
520 }
521 
522 static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
523                           bool excl)
524 {
525         return hfsplus_mknod(dir, dentry, mode, 0);
526 }
527 
528 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
529 {
530         return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
531 }
532 
533 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
534                           struct inode *new_dir, struct dentry *new_dentry,
535                           unsigned int flags)
536 {
537         int res;
538 
539         if (flags & ~RENAME_NOREPLACE)
540                 return -EINVAL;
541 
542         /* Unlink destination if it already exists */
543         if (d_really_is_positive(new_dentry)) {
544                 if (d_is_dir(new_dentry))
545                         res = hfsplus_rmdir(new_dir, new_dentry);
546                 else
547                         res = hfsplus_unlink(new_dir, new_dentry);
548                 if (res)
549                         return res;
550         }
551 
552         res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
553                                  old_dir, &old_dentry->d_name,
554                                  new_dir, &new_dentry->d_name);
555         if (!res)
556                 new_dentry->d_fsdata = old_dentry->d_fsdata;
557         return res;
558 }
559 
560 const struct inode_operations hfsplus_dir_inode_operations = {
561         .lookup                 = hfsplus_lookup,
562         .create                 = hfsplus_create,
563         .link                   = hfsplus_link,
564         .unlink                 = hfsplus_unlink,
565         .mkdir                  = hfsplus_mkdir,
566         .rmdir                  = hfsplus_rmdir,
567         .symlink                = hfsplus_symlink,
568         .mknod                  = hfsplus_mknod,
569         .rename                 = hfsplus_rename,
570         .listxattr              = hfsplus_listxattr,
571 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
572         .get_acl                = hfsplus_get_posix_acl,
573         .set_acl                = hfsplus_set_posix_acl,
574 #endif
575 };
576 
577 const struct file_operations hfsplus_dir_operations = {
578         .fsync          = hfsplus_file_fsync,
579         .read           = generic_read_dir,
580         .iterate_shared = hfsplus_readdir,
581         .unlocked_ioctl = hfsplus_ioctl,
582         .llseek         = generic_file_llseek,
583         .release        = hfsplus_dir_release,
584 };
585 

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