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9#include "hfsplus_fs.h"
10#include "hfsplus_raw.h"
11
12static struct kmem_cache *hfsplus_attr_tree_cachep;
13
14int __init hfsplus_create_attr_tree_cache(void)
15{
16 if (hfsplus_attr_tree_cachep)
17 return -EEXIST;
18
19 hfsplus_attr_tree_cachep =
20 kmem_cache_create("hfsplus_attr_cache",
21 sizeof(hfsplus_attr_entry), 0,
22 SLAB_HWCACHE_ALIGN, NULL);
23 if (!hfsplus_attr_tree_cachep)
24 return -ENOMEM;
25
26 return 0;
27}
28
29void hfsplus_destroy_attr_tree_cache(void)
30{
31 kmem_cache_destroy(hfsplus_attr_tree_cachep);
32}
33
34int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *k1,
35 const hfsplus_btree_key *k2)
36{
37 __be32 k1_cnid, k2_cnid;
38
39 k1_cnid = k1->attr.cnid;
40 k2_cnid = k2->attr.cnid;
41 if (k1_cnid != k2_cnid)
42 return be32_to_cpu(k1_cnid) < be32_to_cpu(k2_cnid) ? -1 : 1;
43
44 return hfsplus_strcmp(
45 (const struct hfsplus_unistr *)&k1->attr.key_name,
46 (const struct hfsplus_unistr *)&k2->attr.key_name);
47}
48
49int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key,
50 u32 cnid, const char *name)
51{
52 int len;
53
54 memset(key, 0, sizeof(struct hfsplus_attr_key));
55 key->attr.cnid = cpu_to_be32(cnid);
56 if (name) {
57 int res = hfsplus_asc2uni(sb,
58 (struct hfsplus_unistr *)&key->attr.key_name,
59 HFSPLUS_ATTR_MAX_STRLEN, name, strlen(name));
60 if (res)
61 return res;
62 len = be16_to_cpu(key->attr.key_name.length);
63 } else {
64 key->attr.key_name.length = 0;
65 len = 0;
66 }
67
68
69
70
71
72
73
74
75 key->key_len =
76 cpu_to_be16(offsetof(struct hfsplus_attr_key, key_name) +
77 2 * len);
78
79 return 0;
80}
81
82hfsplus_attr_entry *hfsplus_alloc_attr_entry(void)
83{
84 return kmem_cache_alloc(hfsplus_attr_tree_cachep, GFP_KERNEL);
85}
86
87void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry)
88{
89 if (entry)
90 kmem_cache_free(hfsplus_attr_tree_cachep, entry);
91}
92
93#define HFSPLUS_INVALID_ATTR_RECORD -1
94
95static int hfsplus_attr_build_record(hfsplus_attr_entry *entry, int record_type,
96 u32 cnid, const void *value, size_t size)
97{
98 if (record_type == HFSPLUS_ATTR_FORK_DATA) {
99
100
101
102
103 memset(entry, 0, sizeof(*entry));
104 return sizeof(struct hfsplus_attr_fork_data);
105 } else if (record_type == HFSPLUS_ATTR_EXTENTS) {
106
107
108
109
110 memset(entry, 0, sizeof(*entry));
111 return sizeof(struct hfsplus_attr_extents);
112 } else if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
113 u16 len;
114
115 memset(entry, 0, sizeof(struct hfsplus_attr_inline_data));
116 entry->inline_data.record_type = cpu_to_be32(record_type);
117 if (size <= HFSPLUS_MAX_INLINE_DATA_SIZE)
118 len = size;
119 else
120 return HFSPLUS_INVALID_ATTR_RECORD;
121 entry->inline_data.length = cpu_to_be16(len);
122 memcpy(entry->inline_data.raw_bytes, value, len);
123
124
125
126
127 len = round_up(len, 2);
128 return offsetof(struct hfsplus_attr_inline_data, raw_bytes) +
129 len;
130 } else
131 memset(entry, 0, sizeof(*entry));
132
133 return HFSPLUS_INVALID_ATTR_RECORD;
134}
135
136int hfsplus_find_attr(struct super_block *sb, u32 cnid,
137 const char *name, struct hfs_find_data *fd)
138{
139 int err = 0;
140
141 hfs_dbg(ATTR_MOD, "find_attr: %s,%d\n", name ? name : NULL, cnid);
142
143 if (!HFSPLUS_SB(sb)->attr_tree) {
144 pr_err("attributes file doesn't exist\n");
145 return -EINVAL;
146 }
147
148 if (name) {
149 err = hfsplus_attr_build_key(sb, fd->search_key, cnid, name);
150 if (err)
151 goto failed_find_attr;
152 err = hfs_brec_find(fd, hfs_find_rec_by_key);
153 if (err)
154 goto failed_find_attr;
155 } else {
156 err = hfsplus_attr_build_key(sb, fd->search_key, cnid, NULL);
157 if (err)
158 goto failed_find_attr;
159 err = hfs_brec_find(fd, hfs_find_1st_rec_by_cnid);
160 if (err)
161 goto failed_find_attr;
162 }
163
164failed_find_attr:
165 return err;
166}
167
168int hfsplus_attr_exists(struct inode *inode, const char *name)
169{
170 int err = 0;
171 struct super_block *sb = inode->i_sb;
172 struct hfs_find_data fd;
173
174 if (!HFSPLUS_SB(sb)->attr_tree)
175 return 0;
176
177 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
178 if (err)
179 return 0;
180
181 err = hfsplus_find_attr(sb, inode->i_ino, name, &fd);
182 if (err)
183 goto attr_not_found;
184
185 hfs_find_exit(&fd);
186 return 1;
187
188attr_not_found:
189 hfs_find_exit(&fd);
190 return 0;
191}
192
193int hfsplus_create_attr(struct inode *inode,
194 const char *name,
195 const void *value, size_t size)
196{
197 struct super_block *sb = inode->i_sb;
198 struct hfs_find_data fd;
199 hfsplus_attr_entry *entry_ptr;
200 int entry_size;
201 int err;
202
203 hfs_dbg(ATTR_MOD, "create_attr: %s,%ld\n",
204 name ? name : NULL, inode->i_ino);
205
206 if (!HFSPLUS_SB(sb)->attr_tree) {
207 pr_err("attributes file doesn't exist\n");
208 return -EINVAL;
209 }
210
211 entry_ptr = hfsplus_alloc_attr_entry();
212 if (!entry_ptr)
213 return -ENOMEM;
214
215 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
216 if (err)
217 goto failed_init_create_attr;
218
219 if (name) {
220 err = hfsplus_attr_build_key(sb, fd.search_key,
221 inode->i_ino, name);
222 if (err)
223 goto failed_create_attr;
224 } else {
225 err = -EINVAL;
226 goto failed_create_attr;
227 }
228
229
230 entry_size = hfsplus_attr_build_record(entry_ptr,
231 HFSPLUS_ATTR_INLINE_DATA,
232 inode->i_ino,
233 value, size);
234 if (entry_size == HFSPLUS_INVALID_ATTR_RECORD) {
235 err = -EINVAL;
236 goto failed_create_attr;
237 }
238
239 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
240 if (err != -ENOENT) {
241 if (!err)
242 err = -EEXIST;
243 goto failed_create_attr;
244 }
245
246 err = hfs_brec_insert(&fd, entry_ptr, entry_size);
247 if (err)
248 goto failed_create_attr;
249
250 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY);
251
252failed_create_attr:
253 hfs_find_exit(&fd);
254
255failed_init_create_attr:
256 hfsplus_destroy_attr_entry(entry_ptr);
257 return err;
258}
259
260static int __hfsplus_delete_attr(struct inode *inode, u32 cnid,
261 struct hfs_find_data *fd)
262{
263 int err = 0;
264 __be32 found_cnid, record_type;
265
266 hfs_bnode_read(fd->bnode, &found_cnid,
267 fd->keyoffset +
268 offsetof(struct hfsplus_attr_key, cnid),
269 sizeof(__be32));
270 if (cnid != be32_to_cpu(found_cnid))
271 return -ENOENT;
272
273 hfs_bnode_read(fd->bnode, &record_type,
274 fd->entryoffset, sizeof(record_type));
275
276 switch (be32_to_cpu(record_type)) {
277 case HFSPLUS_ATTR_INLINE_DATA:
278
279 break;
280 case HFSPLUS_ATTR_FORK_DATA:
281 case HFSPLUS_ATTR_EXTENTS:
282 pr_err("only inline data xattr are supported\n");
283 return -EOPNOTSUPP;
284 default:
285 pr_err("invalid extended attribute record\n");
286 return -ENOENT;
287 }
288
289 err = hfs_brec_remove(fd);
290 if (err)
291 return err;
292
293 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY);
294 return err;
295}
296
297int hfsplus_delete_attr(struct inode *inode, const char *name)
298{
299 int err = 0;
300 struct super_block *sb = inode->i_sb;
301 struct hfs_find_data fd;
302
303 hfs_dbg(ATTR_MOD, "delete_attr: %s,%ld\n",
304 name ? name : NULL, inode->i_ino);
305
306 if (!HFSPLUS_SB(sb)->attr_tree) {
307 pr_err("attributes file doesn't exist\n");
308 return -EINVAL;
309 }
310
311 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
312 if (err)
313 return err;
314
315 if (name) {
316 err = hfsplus_attr_build_key(sb, fd.search_key,
317 inode->i_ino, name);
318 if (err)
319 goto out;
320 } else {
321 pr_err("invalid extended attribute name\n");
322 err = -EINVAL;
323 goto out;
324 }
325
326 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
327 if (err)
328 goto out;
329
330 err = __hfsplus_delete_attr(inode, inode->i_ino, &fd);
331 if (err)
332 goto out;
333
334out:
335 hfs_find_exit(&fd);
336 return err;
337}
338
339int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid)
340{
341 int err = 0;
342 struct hfs_find_data fd;
343
344 hfs_dbg(ATTR_MOD, "delete_all_attrs: %d\n", cnid);
345
346 if (!HFSPLUS_SB(dir->i_sb)->attr_tree) {
347 pr_err("attributes file doesn't exist\n");
348 return -EINVAL;
349 }
350
351 err = hfs_find_init(HFSPLUS_SB(dir->i_sb)->attr_tree, &fd);
352 if (err)
353 return err;
354
355 for (;;) {
356 err = hfsplus_find_attr(dir->i_sb, cnid, NULL, &fd);
357 if (err) {
358 if (err != -ENOENT)
359 pr_err("xattr search failed\n");
360 goto end_delete_all;
361 }
362
363 err = __hfsplus_delete_attr(dir, cnid, &fd);
364 if (err)
365 goto end_delete_all;
366 }
367
368end_delete_all:
369 hfs_find_exit(&fd);
370 return err;
371}
372
