fs/reiserfs/acl.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #include <linux/init.h>
0003 #include <linux/posix_acl.h>
0004
0005 #define REISERFS_ACL_VERSION    0x0001
0006
0007 typedef struct {
0008     __le16 e_tag;
0009     __le16 e_perm;
0010     __le32 e_id;
0011 } reiserfs_acl_entry;
0012
0013 typedef struct {
0014     __le16 e_tag;
0015     __le16 e_perm;
0016 } reiserfs_acl_entry_short;
0017
0018 typedef struct {
0019     __le32 a_version;
0020 } reiserfs_acl_header;
0021
0022 static inline size_t reiserfs_acl_size(int count)
0023 {
0024     if (count <= 4) {
0025         return sizeof(reiserfs_acl_header) +
0026             count * sizeof(reiserfs_acl_entry_short);
0027     } else {
0028         return sizeof(reiserfs_acl_header) +
0029             4 * sizeof(reiserfs_acl_entry_short) +
0030             (count - 4) * sizeof(reiserfs_acl_entry);
0031     }
0032 }
0033
0034 static inline int reiserfs_acl_count(size_t size)
0035 {
0036     ssize_t s;
0037     size -= sizeof(reiserfs_acl_header);
0038     s = size - 4 * sizeof(reiserfs_acl_entry_short);
0039     if (s < 0) {
0040         if (size % sizeof(reiserfs_acl_entry_short))
0041             return -1;
0042         return size / sizeof(reiserfs_acl_entry_short);
0043     } else {
0044         if (s % sizeof(reiserfs_acl_entry))
0045             return -1;
0046         return s / sizeof(reiserfs_acl_entry) + 4;
0047     }
0048 }
0049
0050 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
0051 struct posix_acl *reiserfs_get_acl(struct inode *inode, int type, bool rcu);
0052 int reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
0053              struct posix_acl *acl, int type);
0054 int reiserfs_acl_chmod(struct inode *inode);
0055 int reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0056                  struct inode *dir, struct dentry *dentry,
0057                  struct inode *inode);
0058 int reiserfs_cache_default_acl(struct inode *dir);
0059
0060 #else
0061
0062 #define reiserfs_cache_default_acl(inode) 0
0063 #define reiserfs_get_acl NULL
0064 #define reiserfs_set_acl NULL
0065
0066 static inline int reiserfs_acl_chmod(struct inode *inode)
0067 {
0068     return 0;
0069 }
0070
0071 static inline int
0072 reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0073                  const struct inode *dir, struct dentry *dentry,
0074                  struct inode *inode)
0075 {
0076     return 0;
0077 }
0078 #endif