1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun File: fs/ext2/acl.h 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #include <linux/posix_acl_xattr.h> 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #define EXT2_ACL_VERSION 0x0001 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun typedef struct { 13*4882a593Smuzhiyun __le16 e_tag; 14*4882a593Smuzhiyun __le16 e_perm; 15*4882a593Smuzhiyun __le32 e_id; 16*4882a593Smuzhiyun } ext2_acl_entry; 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun typedef struct { 19*4882a593Smuzhiyun __le16 e_tag; 20*4882a593Smuzhiyun __le16 e_perm; 21*4882a593Smuzhiyun } ext2_acl_entry_short; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun typedef struct { 24*4882a593Smuzhiyun __le32 a_version; 25*4882a593Smuzhiyun } ext2_acl_header; 26*4882a593Smuzhiyun ext2_acl_size(int count)27*4882a593Smuzhiyunstatic inline size_t ext2_acl_size(int count) 28*4882a593Smuzhiyun { 29*4882a593Smuzhiyun if (count <= 4) { 30*4882a593Smuzhiyun return sizeof(ext2_acl_header) + 31*4882a593Smuzhiyun count * sizeof(ext2_acl_entry_short); 32*4882a593Smuzhiyun } else { 33*4882a593Smuzhiyun return sizeof(ext2_acl_header) + 34*4882a593Smuzhiyun 4 * sizeof(ext2_acl_entry_short) + 35*4882a593Smuzhiyun (count - 4) * sizeof(ext2_acl_entry); 36*4882a593Smuzhiyun } 37*4882a593Smuzhiyun } 38*4882a593Smuzhiyun ext2_acl_count(size_t size)39*4882a593Smuzhiyunstatic inline int ext2_acl_count(size_t size) 40*4882a593Smuzhiyun { 41*4882a593Smuzhiyun ssize_t s; 42*4882a593Smuzhiyun size -= sizeof(ext2_acl_header); 43*4882a593Smuzhiyun s = size - 4 * sizeof(ext2_acl_entry_short); 44*4882a593Smuzhiyun if (s < 0) { 45*4882a593Smuzhiyun if (size % sizeof(ext2_acl_entry_short)) 46*4882a593Smuzhiyun return -1; 47*4882a593Smuzhiyun return size / sizeof(ext2_acl_entry_short); 48*4882a593Smuzhiyun } else { 49*4882a593Smuzhiyun if (s % sizeof(ext2_acl_entry)) 50*4882a593Smuzhiyun return -1; 51*4882a593Smuzhiyun return s / sizeof(ext2_acl_entry) + 4; 52*4882a593Smuzhiyun } 53*4882a593Smuzhiyun } 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun #ifdef CONFIG_EXT2_FS_POSIX_ACL 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun /* acl.c */ 58*4882a593Smuzhiyun extern struct posix_acl *ext2_get_acl(struct inode *inode, int type); 59*4882a593Smuzhiyun extern int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type); 60*4882a593Smuzhiyun extern int ext2_init_acl (struct inode *, struct inode *); 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun #else 63*4882a593Smuzhiyun #include <linux/sched.h> 64*4882a593Smuzhiyun #define ext2_get_acl NULL 65*4882a593Smuzhiyun #define ext2_set_acl NULL 66*4882a593Smuzhiyun ext2_init_acl(struct inode * inode,struct inode * dir)67*4882a593Smuzhiyunstatic inline int ext2_init_acl (struct inode *inode, struct inode *dir) 68*4882a593Smuzhiyun { 69*4882a593Smuzhiyun return 0; 70*4882a593Smuzhiyun } 71*4882a593Smuzhiyun #endif 72*4882a593Smuzhiyun 73