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10#include "hfsplus_fs.h"
11#include "hfsplus_raw.h"
12
13static struct kmem_cache *hfsplus_attr_tree_cachep;
14
15int __init hfsplus_create_attr_tree_cache(void)
16{
17 if (hfsplus_attr_tree_cachep)
18 return -EEXIST;
19
20 hfsplus_attr_tree_cachep =
21 kmem_cache_create("hfsplus_attr_cache",
22 sizeof(hfsplus_attr_entry), 0,
23 SLAB_HWCACHE_ALIGN, NULL);
24 if (!hfsplus_attr_tree_cachep)
25 return -ENOMEM;
26
27 return 0;
28}
29
30void hfsplus_destroy_attr_tree_cache(void)
31{
32 kmem_cache_destroy(hfsplus_attr_tree_cachep);
33}
34
35int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *k1,
36 const hfsplus_btree_key *k2)
37{
38 __be32 k1_cnid, k2_cnid;
39
40 k1_cnid = k1->attr.cnid;
41 k2_cnid = k2->attr.cnid;
42 if (k1_cnid != k2_cnid)
43 return be32_to_cpu(k1_cnid) < be32_to_cpu(k2_cnid) ? -1 : 1;
44
45 return hfsplus_strcmp(
46 (const struct hfsplus_unistr *)&k1->attr.key_name,
47 (const struct hfsplus_unistr *)&k2->attr.key_name);
48}
49
50int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key,
51 u32 cnid, const char *name)
52{
53 int len;
54
55 memset(key, 0, sizeof(struct hfsplus_attr_key));
56 key->attr.cnid = cpu_to_be32(cnid);
57 if (name) {
58 int res = hfsplus_asc2uni(sb,
59 (struct hfsplus_unistr *)&key->attr.key_name,
60 HFSPLUS_ATTR_MAX_STRLEN, name, strlen(name));
61 if (res)
62 return res;
63 len = be16_to_cpu(key->attr.key_name.length);
64 } else {
65 key->attr.key_name.length = 0;
66 len = 0;
67 }
68
69
70
71
72
73
74
75
76 key->key_len =
77 cpu_to_be16(offsetof(struct hfsplus_attr_key, key_name) +
78 2 * len);
79
80 return 0;
81}
82
83hfsplus_attr_entry *hfsplus_alloc_attr_entry(void)
84{
85 return kmem_cache_alloc(hfsplus_attr_tree_cachep, GFP_KERNEL);
86}
87
88void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry)
89{
90 if (entry)
91 kmem_cache_free(hfsplus_attr_tree_cachep, entry);
92}
93
94#define HFSPLUS_INVALID_ATTR_RECORD -1
95
96static int hfsplus_attr_build_record(hfsplus_attr_entry *entry, int record_type,
97 u32 cnid, const void *value, size_t size)
98{
99 if (record_type == HFSPLUS_ATTR_FORK_DATA) {
100
101
102
103
104 memset(entry, 0, sizeof(*entry));
105 return sizeof(struct hfsplus_attr_fork_data);
106 } else if (record_type == HFSPLUS_ATTR_EXTENTS) {
107
108
109
110
111 memset(entry, 0, sizeof(*entry));
112 return sizeof(struct hfsplus_attr_extents);
113 } else if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
114 u16 len;
115
116 memset(entry, 0, sizeof(struct hfsplus_attr_inline_data));
117 entry->inline_data.record_type = cpu_to_be32(record_type);
118 if (size <= HFSPLUS_MAX_INLINE_DATA_SIZE)
119 len = size;
120 else
121 return HFSPLUS_INVALID_ATTR_RECORD;
122 entry->inline_data.length = cpu_to_be16(len);
123 memcpy(entry->inline_data.raw_bytes, value, len);
124
125
126
127
128 len = round_up(len, 2);
129 return offsetof(struct hfsplus_attr_inline_data, raw_bytes) +
130 len;
131 } else
132 memset(entry, 0, sizeof(*entry));
133
134 return HFSPLUS_INVALID_ATTR_RECORD;
135}
136
137int hfsplus_find_attr(struct super_block *sb, u32 cnid,
138 const char *name, struct hfs_find_data *fd)
139{
140 int err = 0;
141
142 hfs_dbg(ATTR_MOD, "find_attr: %s,%d\n", name ? name : NULL, cnid);
143
144 if (!HFSPLUS_SB(sb)->attr_tree) {
145 pr_err("attributes file doesn't exist\n");
146 return -EINVAL;
147 }
148
149 if (name) {
150 err = hfsplus_attr_build_key(sb, fd->search_key, cnid, name);
151 if (err)
152 goto failed_find_attr;
153 err = hfs_brec_find(fd, hfs_find_rec_by_key);
154 if (err)
155 goto failed_find_attr;
156 } else {
157 err = hfsplus_attr_build_key(sb, fd->search_key, cnid, NULL);
158 if (err)
159 goto failed_find_attr;
160 err = hfs_brec_find(fd, hfs_find_1st_rec_by_cnid);
161 if (err)
162 goto failed_find_attr;
163 }
164
165failed_find_attr:
166 return err;
167}
168
169int hfsplus_attr_exists(struct inode *inode, const char *name)
170{
171 int err = 0;
172 struct super_block *sb = inode->i_sb;
173 struct hfs_find_data fd;
174
175 if (!HFSPLUS_SB(sb)->attr_tree)
176 return 0;
177
178 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
179 if (err)
180 return 0;
181
182 err = hfsplus_find_attr(sb, inode->i_ino, name, &fd);
183 if (err)
184 goto attr_not_found;
185
186 hfs_find_exit(&fd);
187 return 1;
188
189attr_not_found:
190 hfs_find_exit(&fd);
191 return 0;
192}
193
194int hfsplus_create_attr(struct inode *inode,
195 const char *name,
196 const void *value, size_t size)
197{
198 struct super_block *sb = inode->i_sb;
199 struct hfs_find_data fd;
200 hfsplus_attr_entry *entry_ptr;
201 int entry_size;
202 int err;
203
204 hfs_dbg(ATTR_MOD, "create_attr: %s,%ld\n",
205 name ? name : NULL, inode->i_ino);
206
207 if (!HFSPLUS_SB(sb)->attr_tree) {
208 pr_err("attributes file doesn't exist\n");
209 return -EINVAL;
210 }
211
212 entry_ptr = hfsplus_alloc_attr_entry();
213 if (!entry_ptr)
214 return -ENOMEM;
215
216 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
217 if (err)
218 goto failed_init_create_attr;
219
220 if (name) {
221 err = hfsplus_attr_build_key(sb, fd.search_key,
222 inode->i_ino, name);
223 if (err)
224 goto failed_create_attr;
225 } else {
226 err = -EINVAL;
227 goto failed_create_attr;
228 }
229
230
231 entry_size = hfsplus_attr_build_record(entry_ptr,
232 HFSPLUS_ATTR_INLINE_DATA,
233 inode->i_ino,
234 value, size);
235 if (entry_size == HFSPLUS_INVALID_ATTR_RECORD) {
236 err = -EINVAL;
237 goto failed_create_attr;
238 }
239
240 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
241 if (err != -ENOENT) {
242 if (!err)
243 err = -EEXIST;
244 goto failed_create_attr;
245 }
246
247 err = hfs_brec_insert(&fd, entry_ptr, entry_size);
248 if (err)
249 goto failed_create_attr;
250
251 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY);
252
253failed_create_attr:
254 hfs_find_exit(&fd);
255
256failed_init_create_attr:
257 hfsplus_destroy_attr_entry(entry_ptr);
258 return err;
259}
260
261static int __hfsplus_delete_attr(struct inode *inode, u32 cnid,
262 struct hfs_find_data *fd)
263{
264 int err = 0;
265 __be32 found_cnid, record_type;
266
267 hfs_bnode_read(fd->bnode, &found_cnid,
268 fd->keyoffset +
269 offsetof(struct hfsplus_attr_key, cnid),
270 sizeof(__be32));
271 if (cnid != be32_to_cpu(found_cnid))
272 return -ENOENT;
273
274 hfs_bnode_read(fd->bnode, &record_type,
275 fd->entryoffset, sizeof(record_type));
276
277 switch (be32_to_cpu(record_type)) {
278 case HFSPLUS_ATTR_INLINE_DATA:
279
280 break;
281 case HFSPLUS_ATTR_FORK_DATA:
282 case HFSPLUS_ATTR_EXTENTS:
283 pr_err("only inline data xattr are supported\n");
284 return -EOPNOTSUPP;
285 default:
286 pr_err("invalid extended attribute record\n");
287 return -ENOENT;
288 }
289
290 err = hfs_brec_remove(fd);
291 if (err)
292 return err;
293
294 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY);
295 return err;
296}
297
298int hfsplus_delete_attr(struct inode *inode, const char *name)
299{
300 int err = 0;
301 struct super_block *sb = inode->i_sb;
302 struct hfs_find_data fd;
303
304 hfs_dbg(ATTR_MOD, "delete_attr: %s,%ld\n",
305 name ? name : NULL, inode->i_ino);
306
307 if (!HFSPLUS_SB(sb)->attr_tree) {
308 pr_err("attributes file doesn't exist\n");
309 return -EINVAL;
310 }
311
312 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
313 if (err)
314 return err;
315
316 if (name) {
317 err = hfsplus_attr_build_key(sb, fd.search_key,
318 inode->i_ino, name);
319 if (err)
320 goto out;
321 } else {
322 pr_err("invalid extended attribute name\n");
323 err = -EINVAL;
324 goto out;
325 }
326
327 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
328 if (err)
329 goto out;
330
331 err = __hfsplus_delete_attr(inode, inode->i_ino, &fd);
332 if (err)
333 goto out;
334
335out:
336 hfs_find_exit(&fd);
337 return err;
338}
339
340int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid)
341{
342 int err = 0;
343 struct hfs_find_data fd;
344
345 hfs_dbg(ATTR_MOD, "delete_all_attrs: %d\n", cnid);
346
347 if (!HFSPLUS_SB(dir->i_sb)->attr_tree) {
348 pr_err("attributes file doesn't exist\n");
349 return -EINVAL;
350 }
351
352 err = hfs_find_init(HFSPLUS_SB(dir->i_sb)->attr_tree, &fd);
353 if (err)
354 return err;
355
356 for (;;) {
357 err = hfsplus_find_attr(dir->i_sb, cnid, NULL, &fd);
358 if (err) {
359 if (err != -ENOENT)
360 pr_err("xattr search failed\n");
361 goto end_delete_all;
362 }
363
364 err = __hfsplus_delete_attr(dir, cnid, &fd);
365 if (err)
366 goto end_delete_all;
367 }
368
369end_delete_all:
370 hfs_find_exit(&fd);
371 return err;
372}
373
