acl.h

Go to the documentation of this file.

/*
  File: fs/ext4/acl.h

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

#include <linux/posix_acl_xattr.h>

#define EXT4_ACL_VERSION    0x0001

typedef struct {
    __le16      e_tag;
    __le16      e_perm;
    __le32      e_id;
} ext4_acl_entry;

typedef struct {
    __le16      e_tag;
    __le16      e_perm;
} ext4_acl_entry_short;

typedef struct {
    __le32      a_version;
} ext4_acl_header;

static inline size_t ext4_acl_size(int count)
{
    if (count <= 4) {
        return sizeof(ext4_acl_header) +
               count * sizeof(ext4_acl_entry_short);
    } else {
        return sizeof(ext4_acl_header) +
               4 * sizeof(ext4_acl_entry_short) +
               (count - 4) * sizeof(ext4_acl_entry);
    }
}

static inline int ext4_acl_count(size_t size)
{
    ssize_t s;
    size -= sizeof(ext4_acl_header);
    s = size - 4 * sizeof(ext4_acl_entry_short);
    if (s < 0) {
        if (size % sizeof(ext4_acl_entry_short))
            return -1;
        return size / sizeof(ext4_acl_entry_short);
    } else {
        if (s % sizeof(ext4_acl_entry))
            return -1;
        return s / sizeof(ext4_acl_entry) + 4;
    }
}

#ifdef CONFIG_EXT4_FS_POSIX_ACL

/* acl.c */
struct posix_acl *ext4_get_acl(struct inode *inode, int type);
extern int ext4_acl_chmod(struct inode *);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);

#else  /* CONFIG_EXT4_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext4_get_acl NULL

static inline int
ext4_acl_chmod(struct inode *inode)
{
    return 0;
}

static inline int
ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
    return 0;
}
#endif  /* CONFIG_EXT4_FS_POSIX_ACL */