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

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

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