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TOMOYO Linux Cross Reference
Linux/fs/hfs/catalog.c

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  1 /*
  2  *  linux/fs/hfs/catalog.c
  3  *
  4  * Copyright (C) 1995-1997  Paul H. Hargrove
  5  * (C) 2003 Ardis Technologies <roman@ardistech.com>
  6  * This file may be distributed under the terms of the GNU General Public License.
  7  *
  8  * This file contains the functions related to the catalog B-tree.
  9  *
 10  * Cache code shamelessly stolen from
 11  *     linux/fs/inode.c Copyright (C) 1991, 1992  Linus Torvalds
 12  *     re-shamelessly stolen Copyright (C) 1997 Linus Torvalds
 13  */
 14 
 15 #include "hfs_fs.h"
 16 #include "btree.h"
 17 
 18 /*
 19  * hfs_cat_build_key()
 20  *
 21  * Given the ID of the parent and the name build a search key.
 22  */
 23 void hfs_cat_build_key(struct super_block *sb, btree_key *key, u32 parent, const struct qstr *name)
 24 {
 25         key->cat.reserved = 0;
 26         key->cat.ParID = cpu_to_be32(parent);
 27         if (name) {
 28                 hfs_asc2mac(sb, &key->cat.CName, name);
 29                 key->key_len = 6 + key->cat.CName.len;
 30         } else {
 31                 memset(&key->cat.CName, 0, sizeof(struct hfs_name));
 32                 key->key_len = 6;
 33         }
 34 }
 35 
 36 static int hfs_cat_build_record(hfs_cat_rec *rec, u32 cnid, struct inode *inode)
 37 {
 38         __be32 mtime = hfs_mtime();
 39 
 40         memset(rec, 0, sizeof(*rec));
 41         if (S_ISDIR(inode->i_mode)) {
 42                 rec->type = HFS_CDR_DIR;
 43                 rec->dir.DirID = cpu_to_be32(cnid);
 44                 rec->dir.CrDat = mtime;
 45                 rec->dir.MdDat = mtime;
 46                 rec->dir.BkDat = 0;
 47                 rec->dir.UsrInfo.frView = cpu_to_be16(0xff);
 48                 return sizeof(struct hfs_cat_dir);
 49         } else {
 50                 /* init some fields for the file record */
 51                 rec->type = HFS_CDR_FIL;
 52                 rec->file.Flags = HFS_FIL_USED | HFS_FIL_THD;
 53                 if (!(inode->i_mode & S_IWUSR))
 54                         rec->file.Flags |= HFS_FIL_LOCK;
 55                 rec->file.FlNum = cpu_to_be32(cnid);
 56                 rec->file.CrDat = mtime;
 57                 rec->file.MdDat = mtime;
 58                 rec->file.BkDat = 0;
 59                 rec->file.UsrWds.fdType = HFS_SB(inode->i_sb)->s_type;
 60                 rec->file.UsrWds.fdCreator = HFS_SB(inode->i_sb)->s_creator;
 61                 return sizeof(struct hfs_cat_file);
 62         }
 63 }
 64 
 65 static int hfs_cat_build_thread(struct super_block *sb,
 66                                 hfs_cat_rec *rec, int type,
 67                                 u32 parentid, const struct qstr *name)
 68 {
 69         rec->type = type;
 70         memset(rec->thread.reserved, 0, sizeof(rec->thread.reserved));
 71         rec->thread.ParID = cpu_to_be32(parentid);
 72         hfs_asc2mac(sb, &rec->thread.CName, name);
 73         return sizeof(struct hfs_cat_thread);
 74 }
 75 
 76 /*
 77  * create_entry()
 78  *
 79  * Add a new file or directory to the catalog B-tree and
 80  * return a (struct hfs_cat_entry) for it in '*result'.
 81  */
 82 int hfs_cat_create(u32 cnid, struct inode *dir, const struct qstr *str, struct inode *inode)
 83 {
 84         struct hfs_find_data fd;
 85         struct super_block *sb;
 86         union hfs_cat_rec entry;
 87         int entry_size;
 88         int err;
 89 
 90         hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
 91                 str->name, cnid, inode->i_nlink);
 92         if (dir->i_size >= HFS_MAX_VALENCE)
 93                 return -ENOSPC;
 94 
 95         sb = dir->i_sb;
 96         err = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
 97         if (err)
 98                 return err;
 99 
100         hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
101         entry_size = hfs_cat_build_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
102                         HFS_CDR_THD : HFS_CDR_FTH,
103                         dir->i_ino, str);
104         err = hfs_brec_find(&fd);
105         if (err != -ENOENT) {
106                 if (!err)
107                         err = -EEXIST;
108                 goto err2;
109         }
110         err = hfs_brec_insert(&fd, &entry, entry_size);
111         if (err)
112                 goto err2;
113 
114         hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
115         entry_size = hfs_cat_build_record(&entry, cnid, inode);
116         err = hfs_brec_find(&fd);
117         if (err != -ENOENT) {
118                 /* panic? */
119                 if (!err)
120                         err = -EEXIST;
121                 goto err1;
122         }
123         err = hfs_brec_insert(&fd, &entry, entry_size);
124         if (err)
125                 goto err1;
126 
127         dir->i_size++;
128         dir->i_mtime = dir->i_ctime = current_time(dir);
129         mark_inode_dirty(dir);
130         hfs_find_exit(&fd);
131         return 0;
132 
133 err1:
134         hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
135         if (!hfs_brec_find(&fd))
136                 hfs_brec_remove(&fd);
137 err2:
138         hfs_find_exit(&fd);
139         return err;
140 }
141 
142 /*
143  * hfs_cat_compare()
144  *
145  * Description:
146  *   This is the comparison function used for the catalog B-tree.  In
147  *   comparing catalog B-tree entries, the parent id is the most
148  *   significant field (compared as unsigned ints).  The name field is
149  *   the least significant (compared in "Macintosh lexical order",
150  *   see hfs_strcmp() in string.c)
151  * Input Variable(s):
152  *   struct hfs_cat_key *key1: pointer to the first key to compare
153  *   struct hfs_cat_key *key2: pointer to the second key to compare
154  * Output Variable(s):
155  *   NONE
156  * Returns:
157  *   int: negative if key1<key2, positive if key1>key2, and 0 if key1==key2
158  * Preconditions:
159  *   key1 and key2 point to "valid" (struct hfs_cat_key)s.
160  * Postconditions:
161  *   This function has no side-effects
162  */
163 int hfs_cat_keycmp(const btree_key *key1, const btree_key *key2)
164 {
165         __be32 k1p, k2p;
166 
167         k1p = key1->cat.ParID;
168         k2p = key2->cat.ParID;
169 
170         if (k1p != k2p)
171                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
172 
173         return hfs_strcmp(key1->cat.CName.name, key1->cat.CName.len,
174                           key2->cat.CName.name, key2->cat.CName.len);
175 }
176 
177 /* Try to get a catalog entry for given catalog id */
178 // move to read_super???
179 int hfs_cat_find_brec(struct super_block *sb, u32 cnid,
180                       struct hfs_find_data *fd)
181 {
182         hfs_cat_rec rec;
183         int res, len, type;
184 
185         hfs_cat_build_key(sb, fd->search_key, cnid, NULL);
186         res = hfs_brec_read(fd, &rec, sizeof(rec));
187         if (res)
188                 return res;
189 
190         type = rec.type;
191         if (type != HFS_CDR_THD && type != HFS_CDR_FTH) {
192                 pr_err("found bad thread record in catalog\n");
193                 return -EIO;
194         }
195 
196         fd->search_key->cat.ParID = rec.thread.ParID;
197         len = fd->search_key->cat.CName.len = rec.thread.CName.len;
198         if (len > HFS_NAMELEN) {
199                 pr_err("bad catalog namelength\n");
200                 return -EIO;
201         }
202         memcpy(fd->search_key->cat.CName.name, rec.thread.CName.name, len);
203         return hfs_brec_find(fd);
204 }
205 
206 
207 /*
208  * hfs_cat_delete()
209  *
210  * Delete the indicated file or directory.
211  * The associated thread is also removed unless ('with_thread'==0).
212  */
213 int hfs_cat_delete(u32 cnid, struct inode *dir, const struct qstr *str)
214 {
215         struct super_block *sb;
216         struct hfs_find_data fd;
217         struct hfs_readdir_data *rd;
218         int res, type;
219 
220         hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
221         sb = dir->i_sb;
222         res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
223         if (res)
224                 return res;
225 
226         hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
227         res = hfs_brec_find(&fd);
228         if (res)
229                 goto out;
230 
231         type = hfs_bnode_read_u8(fd.bnode, fd.entryoffset);
232         if (type == HFS_CDR_FIL) {
233                 struct hfs_cat_file file;
234                 hfs_bnode_read(fd.bnode, &file, fd.entryoffset, sizeof(file));
235                 if (be32_to_cpu(file.FlNum) == cnid) {
236 #if 0
237                         hfs_free_fork(sb, &file, HFS_FK_DATA);
238 #endif
239                         hfs_free_fork(sb, &file, HFS_FK_RSRC);
240                 }
241         }
242 
243         /* we only need to take spinlock for exclusion with ->release() */
244         spin_lock(&HFS_I(dir)->open_dir_lock);
245         list_for_each_entry(rd, &HFS_I(dir)->open_dir_list, list) {
246                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
247                         rd->file->f_pos--;
248         }
249         spin_unlock(&HFS_I(dir)->open_dir_lock);
250 
251         res = hfs_brec_remove(&fd);
252         if (res)
253                 goto out;
254 
255         hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
256         res = hfs_brec_find(&fd);
257         if (!res) {
258                 res = hfs_brec_remove(&fd);
259                 if (res)
260                         goto out;
261         }
262 
263         dir->i_size--;
264         dir->i_mtime = dir->i_ctime = current_time(dir);
265         mark_inode_dirty(dir);
266         res = 0;
267 out:
268         hfs_find_exit(&fd);
269 
270         return res;
271 }
272 
273 /*
274  * hfs_cat_move()
275  *
276  * Rename a file or directory, possibly to a new directory.
277  * If the destination exists it is removed and a
278  * (struct hfs_cat_entry) for it is returned in '*result'.
279  */
280 int hfs_cat_move(u32 cnid, struct inode *src_dir, const struct qstr *src_name,
281                  struct inode *dst_dir, const struct qstr *dst_name)
282 {
283         struct super_block *sb;
284         struct hfs_find_data src_fd, dst_fd;
285         union hfs_cat_rec entry;
286         int entry_size, type;
287         int err;
288 
289         hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
290                 cnid, src_dir->i_ino, src_name->name,
291                 dst_dir->i_ino, dst_name->name);
292         sb = src_dir->i_sb;
293         err = hfs_find_init(HFS_SB(sb)->cat_tree, &src_fd);
294         if (err)
295                 return err;
296         dst_fd = src_fd;
297 
298         /* find the old dir entry and read the data */
299         hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
300         err = hfs_brec_find(&src_fd);
301         if (err)
302                 goto out;
303         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
304                 err = -EIO;
305                 goto out;
306         }
307 
308         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
309                             src_fd.entrylength);
310 
311         /* create new dir entry with the data from the old entry */
312         hfs_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
313         err = hfs_brec_find(&dst_fd);
314         if (err != -ENOENT) {
315                 if (!err)
316                         err = -EEXIST;
317                 goto out;
318         }
319 
320         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
321         if (err)
322                 goto out;
323         dst_dir->i_size++;
324         dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
325         mark_inode_dirty(dst_dir);
326 
327         /* finally remove the old entry */
328         hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
329         err = hfs_brec_find(&src_fd);
330         if (err)
331                 goto out;
332         err = hfs_brec_remove(&src_fd);
333         if (err)
334                 goto out;
335         src_dir->i_size--;
336         src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
337         mark_inode_dirty(src_dir);
338 
339         type = entry.type;
340         if (type == HFS_CDR_FIL && !(entry.file.Flags & HFS_FIL_THD))
341                 goto out;
342 
343         /* remove old thread entry */
344         hfs_cat_build_key(sb, src_fd.search_key, cnid, NULL);
345         err = hfs_brec_find(&src_fd);
346         if (err)
347                 goto out;
348         err = hfs_brec_remove(&src_fd);
349         if (err)
350                 goto out;
351 
352         /* create new thread entry */
353         hfs_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
354         entry_size = hfs_cat_build_thread(sb, &entry, type == HFS_CDR_FIL ? HFS_CDR_FTH : HFS_CDR_THD,
355                                         dst_dir->i_ino, dst_name);
356         err = hfs_brec_find(&dst_fd);
357         if (err != -ENOENT) {
358                 if (!err)
359                         err = -EEXIST;
360                 goto out;
361         }
362         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
363 out:
364         hfs_bnode_put(dst_fd.bnode);
365         hfs_find_exit(&src_fd);
366         return err;
367 }
368 

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