2 * linux/fs/hfsplus/attributes.c
4 * Vyacheslav Dubeyko <slava@dubeyko.com>
6 * Handling of records in attributes tree
9 #include "hfsplus_fs.h"
10 #include "hfsplus_raw.h"
12 static struct kmem_cache *hfsplus_attr_tree_cachep;
14 int __init hfsplus_create_attr_tree_cache(void)
16 if (hfsplus_attr_tree_cachep)
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)
29 void hfsplus_destroy_attr_tree_cache(void)
31 kmem_cache_destroy(hfsplus_attr_tree_cachep);
34 int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *k1,
35 const hfsplus_btree_key *k2)
37 __be32 k1_cnid, k2_cnid;
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;
44 return hfsplus_strcmp(
45 (const struct hfsplus_unistr *)&k1->attr.key_name,
46 (const struct hfsplus_unistr *)&k2->attr.key_name);
49 int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key,
50 u32 cnid, const char *name)
54 memset(key, 0, sizeof(struct hfsplus_attr_key));
55 key->attr.cnid = cpu_to_be32(cnid);
57 int res = hfsplus_asc2uni(sb,
58 (struct hfsplus_unistr *)&key->attr.key_name,
59 HFSPLUS_ATTR_MAX_STRLEN, name, strlen(name));
62 len = be16_to_cpu(key->attr.key_name.length);
64 key->attr.key_name.length = 0;
68 /* The length of the key, as stored in key_len field, does not include
69 * the size of the key_len field itself.
70 * So, offsetof(hfsplus_attr_key, key_name) is a trick because
71 * it takes into consideration key_len field (__be16) of
72 * hfsplus_attr_key structure instead of length field (__be16) of
73 * hfsplus_attr_unistr structure.
76 cpu_to_be16(offsetof(struct hfsplus_attr_key, key_name) +
82 hfsplus_attr_entry *hfsplus_alloc_attr_entry(void)
84 return kmem_cache_alloc(hfsplus_attr_tree_cachep, GFP_KERNEL);
87 void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry)
90 kmem_cache_free(hfsplus_attr_tree_cachep, entry);
93 #define HFSPLUS_INVALID_ATTR_RECORD -1
95 static int hfsplus_attr_build_record(hfsplus_attr_entry *entry, int record_type,
96 u32 cnid, const void *value, size_t size)
98 if (record_type == HFSPLUS_ATTR_FORK_DATA) {
100 * Mac OS X supports only inline data attributes.
103 memset(entry, 0, sizeof(*entry));
104 return sizeof(struct hfsplus_attr_fork_data);
105 } else if (record_type == HFSPLUS_ATTR_EXTENTS) {
107 * Mac OS X supports only inline data attributes.
110 memset(entry, 0, sizeof(*entry));
111 return sizeof(struct hfsplus_attr_extents);
112 } else if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
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)
120 return HFSPLUS_INVALID_ATTR_RECORD;
121 entry->inline_data.length = cpu_to_be16(len);
122 memcpy(entry->inline_data.raw_bytes, value, len);
124 * Align len on two-byte boundary.
125 * It needs to add pad byte if we have odd len.
127 len = round_up(len, 2);
128 return offsetof(struct hfsplus_attr_inline_data, raw_bytes) +
130 } else /* invalid input */
131 memset(entry, 0, sizeof(*entry));
133 return HFSPLUS_INVALID_ATTR_RECORD;
136 int hfsplus_find_attr(struct super_block *sb, u32 cnid,
137 const char *name, struct hfs_find_data *fd)
141 hfs_dbg(ATTR_MOD, "find_attr: %s,%d\n", name ? name : NULL, cnid);
143 if (!HFSPLUS_SB(sb)->attr_tree) {
144 pr_err("attributes file doesn't exist\n");
149 err = hfsplus_attr_build_key(sb, fd->search_key, cnid, name);
151 goto failed_find_attr;
152 err = hfs_brec_find(fd, hfs_find_rec_by_key);
154 goto failed_find_attr;
156 err = hfsplus_attr_build_key(sb, fd->search_key, cnid, NULL);
158 goto failed_find_attr;
159 err = hfs_brec_find(fd, hfs_find_1st_rec_by_cnid);
161 goto failed_find_attr;
168 int hfsplus_attr_exists(struct inode *inode, const char *name)
171 struct super_block *sb = inode->i_sb;
172 struct hfs_find_data fd;
174 if (!HFSPLUS_SB(sb)->attr_tree)
177 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
181 err = hfsplus_find_attr(sb, inode->i_ino, name, &fd);
193 int hfsplus_create_attr(struct inode *inode,
195 const void *value, size_t size)
197 struct super_block *sb = inode->i_sb;
198 struct hfs_find_data fd;
199 hfsplus_attr_entry *entry_ptr;
203 hfs_dbg(ATTR_MOD, "create_attr: %s,%ld\n",
204 name ? name : NULL, inode->i_ino);
206 if (!HFSPLUS_SB(sb)->attr_tree) {
207 pr_err("attributes file doesn't exist\n");
211 entry_ptr = hfsplus_alloc_attr_entry();
215 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
217 goto failed_init_create_attr;
219 /* Fail early and avoid ENOSPC during the btree operation */
220 err = hfs_bmap_reserve(fd.tree, fd.tree->depth + 1);
222 goto failed_create_attr;
225 err = hfsplus_attr_build_key(sb, fd.search_key,
228 goto failed_create_attr;
231 goto failed_create_attr;
234 /* Mac OS X supports only inline data attributes. */
235 entry_size = hfsplus_attr_build_record(entry_ptr,
236 HFSPLUS_ATTR_INLINE_DATA,
239 if (entry_size == HFSPLUS_INVALID_ATTR_RECORD) {
241 goto failed_create_attr;
244 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
245 if (err != -ENOENT) {
248 goto failed_create_attr;
251 err = hfs_brec_insert(&fd, entry_ptr, entry_size);
253 goto failed_create_attr;
255 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY);
260 failed_init_create_attr:
261 hfsplus_destroy_attr_entry(entry_ptr);
265 static int __hfsplus_delete_attr(struct inode *inode, u32 cnid,
266 struct hfs_find_data *fd)
269 __be32 found_cnid, record_type;
271 hfs_bnode_read(fd->bnode, &found_cnid,
273 offsetof(struct hfsplus_attr_key, cnid),
275 if (cnid != be32_to_cpu(found_cnid))
278 hfs_bnode_read(fd->bnode, &record_type,
279 fd->entryoffset, sizeof(record_type));
281 switch (be32_to_cpu(record_type)) {
282 case HFSPLUS_ATTR_INLINE_DATA:
283 /* All is OK. Do nothing. */
285 case HFSPLUS_ATTR_FORK_DATA:
286 case HFSPLUS_ATTR_EXTENTS:
287 pr_err("only inline data xattr are supported\n");
290 pr_err("invalid extended attribute record\n");
294 /* Avoid btree corruption */
295 hfs_bnode_read(fd->bnode, fd->search_key,
296 fd->keyoffset, fd->keylength);
298 err = hfs_brec_remove(fd);
302 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY);
306 int hfsplus_delete_attr(struct inode *inode, const char *name)
309 struct super_block *sb = inode->i_sb;
310 struct hfs_find_data fd;
312 hfs_dbg(ATTR_MOD, "delete_attr: %s,%ld\n",
313 name ? name : NULL, inode->i_ino);
315 if (!HFSPLUS_SB(sb)->attr_tree) {
316 pr_err("attributes file doesn't exist\n");
320 err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd);
324 /* Fail early and avoid ENOSPC during the btree operation */
325 err = hfs_bmap_reserve(fd.tree, fd.tree->depth);
330 err = hfsplus_attr_build_key(sb, fd.search_key,
335 pr_err("invalid extended attribute name\n");
340 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
344 err = __hfsplus_delete_attr(inode, inode->i_ino, &fd);
353 int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid)
356 struct hfs_find_data fd;
358 hfs_dbg(ATTR_MOD, "delete_all_attrs: %d\n", cnid);
360 if (!HFSPLUS_SB(dir->i_sb)->attr_tree) {
361 pr_err("attributes file doesn't exist\n");
365 err = hfs_find_init(HFSPLUS_SB(dir->i_sb)->attr_tree, &fd);
370 err = hfsplus_find_attr(dir->i_sb, cnid, NULL, &fd);
373 pr_err("xattr search failed\n");
377 err = __hfsplus_delete_attr(dir, cnid, &fd);