1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/posix_acl.h>
10 static const char * const acl_types[] = {
11 [ACL_USER_OBJ] = "user_obj",
13 [ACL_GROUP_OBJ] = "group_obj",
14 [ACL_GROUP] = "group",
16 [ACL_OTHER] = "other",
20 void bch2_acl_to_text(struct printbuf *out, const void *value, size_t size)
22 const void *p, *end = value + size;
25 size < sizeof(bch_acl_header) ||
26 ((bch_acl_header *)value)->a_version != cpu_to_le32(BCH_ACL_VERSION))
29 p = value + sizeof(bch_acl_header);
31 const bch_acl_entry *in = p;
32 unsigned tag = le16_to_cpu(in->e_tag);
34 prt_str(out, acl_types[tag]);
41 p += sizeof(bch_acl_entry_short);
44 prt_printf(out, " uid %u", le32_to_cpu(in->e_id));
45 p += sizeof(bch_acl_entry);
48 prt_printf(out, " gid %u", le32_to_cpu(in->e_id));
49 p += sizeof(bch_acl_entry);
53 prt_printf(out, " %o", le16_to_cpu(in->e_perm));
60 #ifdef CONFIG_BCACHEFS_POSIX_ACL
65 #include <linux/posix_acl_xattr.h>
66 #include <linux/sched.h>
67 #include <linux/slab.h>
69 static inline size_t bch2_acl_size(unsigned nr_short, unsigned nr_long)
71 return sizeof(bch_acl_header) +
72 sizeof(bch_acl_entry_short) * nr_short +
73 sizeof(bch_acl_entry) * nr_long;
76 static inline int acl_to_xattr_type(int type)
80 return KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS;
81 case ACL_TYPE_DEFAULT:
82 return KEY_TYPE_XATTR_INDEX_POSIX_ACL_DEFAULT;
89 * Convert from filesystem to in-memory representation.
91 static struct posix_acl *bch2_acl_from_disk(struct btree_trans *trans,
92 const void *value, size_t size)
94 const void *p, *end = value + size;
95 struct posix_acl *acl;
96 struct posix_acl_entry *out;
102 if (size < sizeof(bch_acl_header))
104 if (((bch_acl_header *)value)->a_version !=
105 cpu_to_le32(BCH_ACL_VERSION))
108 p = value + sizeof(bch_acl_header);
110 const bch_acl_entry *entry = p;
112 if (p + sizeof(bch_acl_entry_short) > end)
115 switch (le16_to_cpu(entry->e_tag)) {
120 p += sizeof(bch_acl_entry_short);
124 p += sizeof(bch_acl_entry);
139 acl = allocate_dropping_locks(trans, ret,
140 posix_acl_alloc(count, _gfp));
142 return ERR_PTR(-ENOMEM);
148 out = acl->a_entries;
150 p = value + sizeof(bch_acl_header);
152 const bch_acl_entry *in = p;
154 out->e_tag = le16_to_cpu(in->e_tag);
155 out->e_perm = le16_to_cpu(in->e_perm);
157 switch (out->e_tag) {
162 p += sizeof(bch_acl_entry_short);
165 out->e_uid = make_kuid(&init_user_ns,
166 le32_to_cpu(in->e_id));
167 p += sizeof(bch_acl_entry);
170 out->e_gid = make_kgid(&init_user_ns,
171 le32_to_cpu(in->e_id));
172 p += sizeof(bch_acl_entry);
179 BUG_ON(out != acl->a_entries + acl->a_count);
183 pr_err("invalid acl entry");
184 return ERR_PTR(-EINVAL);
187 #define acl_for_each_entry(acl, acl_e) \
188 for (acl_e = acl->a_entries; \
189 acl_e < acl->a_entries + acl->a_count; \
193 * Convert from in-memory to filesystem representation.
195 static struct bkey_i_xattr *
196 bch2_acl_to_xattr(struct btree_trans *trans,
197 const struct posix_acl *acl,
200 struct bkey_i_xattr *xattr;
201 bch_acl_header *acl_header;
202 const struct posix_acl_entry *acl_e;
204 unsigned nr_short = 0, nr_long = 0, acl_len, u64s;
206 acl_for_each_entry(acl, acl_e) {
207 switch (acl_e->e_tag) {
219 return ERR_PTR(-EINVAL);
223 acl_len = bch2_acl_size(nr_short, nr_long);
224 u64s = BKEY_U64s + xattr_val_u64s(0, acl_len);
227 return ERR_PTR(-E2BIG);
229 xattr = bch2_trans_kmalloc(trans, u64s * sizeof(u64));
233 bkey_xattr_init(&xattr->k_i);
234 xattr->k.u64s = u64s;
235 xattr->v.x_type = acl_to_xattr_type(type);
236 xattr->v.x_name_len = 0;
237 xattr->v.x_val_len = cpu_to_le16(acl_len);
239 acl_header = xattr_val(&xattr->v);
240 acl_header->a_version = cpu_to_le32(BCH_ACL_VERSION);
242 outptr = (void *) acl_header + sizeof(*acl_header);
244 acl_for_each_entry(acl, acl_e) {
245 bch_acl_entry *entry = outptr;
247 entry->e_tag = cpu_to_le16(acl_e->e_tag);
248 entry->e_perm = cpu_to_le16(acl_e->e_perm);
249 switch (acl_e->e_tag) {
251 entry->e_id = cpu_to_le32(
252 from_kuid(&init_user_ns, acl_e->e_uid));
253 outptr += sizeof(bch_acl_entry);
256 entry->e_id = cpu_to_le32(
257 from_kgid(&init_user_ns, acl_e->e_gid));
258 outptr += sizeof(bch_acl_entry);
265 outptr += sizeof(bch_acl_entry_short);
270 BUG_ON(outptr != xattr_val(&xattr->v) + acl_len);
275 struct posix_acl *bch2_get_acl(struct mnt_idmap *idmap,
276 struct dentry *dentry, int type)
278 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
279 struct bch_fs *c = inode->v.i_sb->s_fs_info;
280 struct bch_hash_info hash = bch2_hash_info_init(c, &inode->ei_inode);
281 struct xattr_search_key search = X_SEARCH(acl_to_xattr_type(type), "", 0);
282 struct btree_trans *trans = bch2_trans_get(c);
283 struct btree_iter iter = { NULL };
284 struct bkey_s_c_xattr xattr;
285 struct posix_acl *acl = NULL;
289 bch2_trans_begin(trans);
291 ret = bch2_hash_lookup(trans, &iter, bch2_xattr_hash_desc,
292 &hash, inode_inum(inode), &search, 0);
294 if (!bch2_err_matches(ret, ENOENT))
299 k = bch2_btree_iter_peek_slot(&iter);
306 xattr = bkey_s_c_to_xattr(k);
307 acl = bch2_acl_from_disk(trans, xattr_val(xattr.v),
308 le16_to_cpu(xattr.v->x_val_len));
311 set_cached_acl(&inode->v, type, acl);
313 if (bch2_err_matches(PTR_ERR_OR_ZERO(acl), BCH_ERR_transaction_restart))
316 bch2_trans_iter_exit(trans, &iter);
317 bch2_trans_put(trans);
321 int bch2_set_acl_trans(struct btree_trans *trans, subvol_inum inum,
322 struct bch_inode_unpacked *inode_u,
323 struct posix_acl *acl, int type)
325 struct bch_hash_info hash_info = bch2_hash_info_init(trans->c, inode_u);
328 if (type == ACL_TYPE_DEFAULT &&
329 !S_ISDIR(inode_u->bi_mode))
330 return acl ? -EACCES : 0;
333 struct bkey_i_xattr *xattr =
334 bch2_acl_to_xattr(trans, acl, type);
336 return PTR_ERR(xattr);
338 ret = bch2_hash_set(trans, bch2_xattr_hash_desc, &hash_info,
339 inum, &xattr->k_i, 0);
341 struct xattr_search_key search =
342 X_SEARCH(acl_to_xattr_type(type), "", 0);
344 ret = bch2_hash_delete(trans, bch2_xattr_hash_desc, &hash_info,
348 return bch2_err_matches(ret, ENOENT) ? 0 : ret;
351 int bch2_set_acl(struct mnt_idmap *idmap,
352 struct dentry *dentry,
353 struct posix_acl *_acl, int type)
355 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
356 struct bch_fs *c = inode->v.i_sb->s_fs_info;
357 struct btree_trans *trans = bch2_trans_get(c);
358 struct btree_iter inode_iter = { NULL };
359 struct bch_inode_unpacked inode_u;
360 struct posix_acl *acl;
364 mutex_lock(&inode->ei_update_lock);
366 bch2_trans_begin(trans);
369 ret = bch2_subvol_is_ro_trans(trans, inode->ei_subvol) ?:
370 bch2_inode_peek(trans, &inode_iter, &inode_u, inode_inum(inode),
375 mode = inode_u.bi_mode;
377 if (type == ACL_TYPE_ACCESS) {
378 ret = posix_acl_update_mode(idmap, &inode->v, &mode, &acl);
383 ret = bch2_set_acl_trans(trans, inode_inum(inode), &inode_u, acl, type);
387 inode_u.bi_ctime = bch2_current_time(c);
388 inode_u.bi_mode = mode;
390 ret = bch2_inode_write(trans, &inode_iter, &inode_u) ?:
391 bch2_trans_commit(trans, NULL, NULL, 0);
393 bch2_trans_iter_exit(trans, &inode_iter);
395 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
400 bch2_inode_update_after_write(trans, inode, &inode_u,
401 ATTR_CTIME|ATTR_MODE);
403 set_cached_acl(&inode->v, type, acl);
405 mutex_unlock(&inode->ei_update_lock);
406 bch2_trans_put(trans);
411 int bch2_acl_chmod(struct btree_trans *trans, subvol_inum inum,
412 struct bch_inode_unpacked *inode,
414 struct posix_acl **new_acl)
416 struct bch_hash_info hash_info = bch2_hash_info_init(trans->c, inode);
417 struct xattr_search_key search = X_SEARCH(KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS, "", 0);
418 struct btree_iter iter;
419 struct bkey_s_c_xattr xattr;
420 struct bkey_i_xattr *new;
421 struct posix_acl *acl = NULL;
425 ret = bch2_hash_lookup(trans, &iter, bch2_xattr_hash_desc,
426 &hash_info, inum, &search, BTREE_ITER_INTENT);
428 return bch2_err_matches(ret, ENOENT) ? 0 : ret;
430 k = bch2_btree_iter_peek_slot(&iter);
434 xattr = bkey_s_c_to_xattr(k);
436 acl = bch2_acl_from_disk(trans, xattr_val(xattr.v),
437 le16_to_cpu(xattr.v->x_val_len));
438 ret = PTR_ERR_OR_ZERO(acl);
439 if (IS_ERR_OR_NULL(acl))
442 ret = allocate_dropping_locks_errcode(trans,
443 __posix_acl_chmod(&acl, _gfp, mode));
447 new = bch2_acl_to_xattr(trans, acl, ACL_TYPE_ACCESS);
454 ret = bch2_trans_update(trans, &iter, &new->k_i, 0);
458 bch2_trans_iter_exit(trans, &iter);
459 if (!IS_ERR_OR_NULL(acl))
464 #endif /* CONFIG_BCACHEFS_POSIX_ACL */