acl.h

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/*
  File: fs/ext2/acl.h

  (C) 2001 Andreas Gruenbacher, <[email protected]>
*/

#include <linux/posix_acl_xattr.h>

#define EXT2_ACL_VERSION    0x0001

typedef struct {
    __le16      e_tag;
    __le16      e_perm;
    __le32      e_id;
} ext2_acl_entry;

typedef struct {
    __le16      e_tag;
    __le16      e_perm;
} ext2_acl_entry_short;

typedef struct {
    __le32      a_version;
} ext2_acl_header;

static inline size_t ext2_acl_size(int count)
{
    if (count <= 4) {
        return sizeof(ext2_acl_header) +
               count * sizeof(ext2_acl_entry_short);
    } else {
        return sizeof(ext2_acl_header) +
               4 * sizeof(ext2_acl_entry_short) +
               (count - 4) * sizeof(ext2_acl_entry);
    }
}

static inline int ext2_acl_count(size_t size)
{
    ssize_t s;
    size -= sizeof(ext2_acl_header);
    s = size - 4 * sizeof(ext2_acl_entry_short);
    if (s < 0) {
        if (size % sizeof(ext2_acl_entry_short))
            return -1;
        return size / sizeof(ext2_acl_entry_short);
    } else {
        if (s % sizeof(ext2_acl_entry))
            return -1;
        return s / sizeof(ext2_acl_entry) + 4;
    }
}

#ifdef CONFIG_EXT2_FS_POSIX_ACL

/* acl.c */
extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
extern int ext2_acl_chmod (struct inode *);
extern int ext2_init_acl (struct inode *, struct inode *);

#else
#include <linux/sched.h>
#define ext2_get_acl    NULL
#define ext2_set_acl    NULL

static inline int
ext2_acl_chmod (struct inode *inode)
{
    return 0;
}

static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
{
    return 0;
}
#endif