4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
7 * Portions of this code from linux/fs/ext2/acl.c
9 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
15 #include <linux/f2fs_fs.h>
20 #define get_inode_mode(i) ((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
21 (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
23 static inline size_t f2fs_acl_size(int count)
26 return sizeof(struct f2fs_acl_header) +
27 count * sizeof(struct f2fs_acl_entry_short);
29 return sizeof(struct f2fs_acl_header) +
30 4 * sizeof(struct f2fs_acl_entry_short) +
31 (count - 4) * sizeof(struct f2fs_acl_entry);
35 static inline int f2fs_acl_count(size_t size)
38 size -= sizeof(struct f2fs_acl_header);
39 s = size - 4 * sizeof(struct f2fs_acl_entry_short);
41 if (size % sizeof(struct f2fs_acl_entry_short))
43 return size / sizeof(struct f2fs_acl_entry_short);
45 if (s % sizeof(struct f2fs_acl_entry))
47 return s / sizeof(struct f2fs_acl_entry) + 4;
51 static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
54 struct posix_acl *acl;
55 struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
56 struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
57 const char *end = value + size;
59 if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
60 return ERR_PTR(-EINVAL);
62 count = f2fs_acl_count(size);
64 return ERR_PTR(-EINVAL);
68 acl = posix_acl_alloc(count, GFP_KERNEL);
70 return ERR_PTR(-ENOMEM);
72 for (i = 0; i < count; i++) {
74 if ((char *)entry > end)
77 acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
78 acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
80 switch (acl->a_entries[i].e_tag) {
85 entry = (struct f2fs_acl_entry *)((char *)entry +
86 sizeof(struct f2fs_acl_entry_short));
90 acl->a_entries[i].e_uid =
91 make_kuid(&init_user_ns,
92 le32_to_cpu(entry->e_id));
93 entry = (struct f2fs_acl_entry *)((char *)entry +
94 sizeof(struct f2fs_acl_entry));
97 acl->a_entries[i].e_gid =
98 make_kgid(&init_user_ns,
99 le32_to_cpu(entry->e_id));
100 entry = (struct f2fs_acl_entry *)((char *)entry +
101 sizeof(struct f2fs_acl_entry));
107 if ((char *)entry != end)
111 posix_acl_release(acl);
112 return ERR_PTR(-EINVAL);
115 static void *f2fs_acl_to_disk(const struct posix_acl *acl, size_t *size)
117 struct f2fs_acl_header *f2fs_acl;
118 struct f2fs_acl_entry *entry;
121 f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count *
122 sizeof(struct f2fs_acl_entry), GFP_KERNEL);
124 return ERR_PTR(-ENOMEM);
126 f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
127 entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
129 for (i = 0; i < acl->a_count; i++) {
131 entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
132 entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
134 switch (acl->a_entries[i].e_tag) {
136 entry->e_id = cpu_to_le32(
137 from_kuid(&init_user_ns,
138 acl->a_entries[i].e_uid));
139 entry = (struct f2fs_acl_entry *)((char *)entry +
140 sizeof(struct f2fs_acl_entry));
143 entry->e_id = cpu_to_le32(
144 from_kgid(&init_user_ns,
145 acl->a_entries[i].e_gid));
146 entry = (struct f2fs_acl_entry *)((char *)entry +
147 sizeof(struct f2fs_acl_entry));
153 entry = (struct f2fs_acl_entry *)((char *)entry +
154 sizeof(struct f2fs_acl_entry_short));
160 *size = f2fs_acl_size(acl->a_count);
161 return (void *)f2fs_acl;
165 return ERR_PTR(-EINVAL);
168 struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
170 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
171 int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
173 struct posix_acl *acl;
176 if (!test_opt(sbi, POSIX_ACL))
179 acl = get_cached_acl(inode, type);
180 if (acl != ACL_NOT_CACHED)
183 if (type == ACL_TYPE_ACCESS)
184 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
186 retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
188 value = kmalloc(retval, GFP_KERNEL);
190 return ERR_PTR(-ENOMEM);
191 retval = f2fs_getxattr(inode, name_index, "", value, retval);
195 if (retval == -ENODATA)
198 acl = ERR_PTR(retval);
200 acl = f2fs_acl_from_disk(value, retval);
204 set_cached_acl(inode, type, acl);
209 static int f2fs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
211 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
212 struct f2fs_inode_info *fi = F2FS_I(inode);
218 if (!test_opt(sbi, POSIX_ACL))
220 if (S_ISLNK(inode->i_mode))
224 case ACL_TYPE_ACCESS:
225 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
227 error = posix_acl_equiv_mode(acl, &inode->i_mode);
230 set_acl_inode(fi, inode->i_mode);
236 case ACL_TYPE_DEFAULT:
237 name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
238 if (!S_ISDIR(inode->i_mode))
239 return acl ? -EACCES : 0;
247 value = f2fs_acl_to_disk(acl, &size);
249 cond_clear_inode_flag(fi, FI_ACL_MODE);
250 return (int)PTR_ERR(value);
254 error = f2fs_setxattr(inode, name_index, "", value, size);
258 set_cached_acl(inode, type, acl);
260 cond_clear_inode_flag(fi, FI_ACL_MODE);
264 int f2fs_init_acl(struct inode *inode, struct inode *dir)
266 struct posix_acl *acl = NULL;
267 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
270 if (!S_ISLNK(inode->i_mode)) {
271 if (test_opt(sbi, POSIX_ACL)) {
272 acl = f2fs_get_acl(dir, ACL_TYPE_DEFAULT);
277 inode->i_mode &= ~current_umask();
280 if (test_opt(sbi, POSIX_ACL) && acl) {
282 if (S_ISDIR(inode->i_mode)) {
283 error = f2fs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
287 error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
291 error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
294 posix_acl_release(acl);
298 int f2fs_acl_chmod(struct inode *inode)
300 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
301 struct posix_acl *acl;
303 mode_t mode = get_inode_mode(inode);
305 if (!test_opt(sbi, POSIX_ACL))
310 acl = f2fs_get_acl(inode, ACL_TYPE_ACCESS);
311 if (IS_ERR(acl) || !acl)
314 error = posix_acl_chmod(&acl, GFP_KERNEL, mode);
317 error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
318 posix_acl_release(acl);
322 static size_t f2fs_xattr_list_acl(struct dentry *dentry, char *list,
323 size_t list_size, const char *name, size_t name_len, int type)
325 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
326 const char *xname = POSIX_ACL_XATTR_DEFAULT;
329 if (!test_opt(sbi, POSIX_ACL))
332 if (type == ACL_TYPE_ACCESS)
333 xname = POSIX_ACL_XATTR_ACCESS;
335 size = strlen(xname) + 1;
336 if (list && size <= list_size)
337 memcpy(list, xname, size);
341 static int f2fs_xattr_get_acl(struct dentry *dentry, const char *name,
342 void *buffer, size_t size, int type)
344 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
345 struct posix_acl *acl;
348 if (strcmp(name, "") != 0)
350 if (!test_opt(sbi, POSIX_ACL))
353 acl = f2fs_get_acl(dentry->d_inode, type);
358 error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
359 posix_acl_release(acl);
364 static int f2fs_xattr_set_acl(struct dentry *dentry, const char *name,
365 const void *value, size_t size, int flags, int type)
367 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
368 struct inode *inode = dentry->d_inode;
369 struct posix_acl *acl = NULL;
372 if (strcmp(name, "") != 0)
374 if (!test_opt(sbi, POSIX_ACL))
376 if (!inode_owner_or_capable(inode))
380 acl = posix_acl_from_xattr(&init_user_ns, value, size);
384 error = posix_acl_valid(acl);
386 goto release_and_out;
392 error = f2fs_set_acl(inode, type, acl);
395 posix_acl_release(acl);
399 const struct xattr_handler f2fs_xattr_acl_default_handler = {
400 .prefix = POSIX_ACL_XATTR_DEFAULT,
401 .flags = ACL_TYPE_DEFAULT,
402 .list = f2fs_xattr_list_acl,
403 .get = f2fs_xattr_get_acl,
404 .set = f2fs_xattr_set_acl,
407 const struct xattr_handler f2fs_xattr_acl_access_handler = {
408 .prefix = POSIX_ACL_XATTR_ACCESS,
409 .flags = ACL_TYPE_ACCESS,
410 .list = f2fs_xattr_list_acl,
411 .get = f2fs_xattr_get_acl,
412 .set = f2fs_xattr_set_acl,