82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
/*
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File: fs/ext4/acl.h
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(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#include <linux/posix_acl_xattr.h>
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#define EXT4_ACL_VERSION 0x0001
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typedef struct {
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__le16 e_tag;
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__le16 e_perm;
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__le32 e_id;
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} ext4_acl_entry;
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typedef struct {
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__le16 e_tag;
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__le16 e_perm;
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} ext4_acl_entry_short;
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typedef struct {
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__le32 a_version;
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} ext4_acl_header;
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static inline size_t ext4_acl_size(int count)
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{
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if (count <= 4) {
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return sizeof(ext4_acl_header) +
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count * sizeof(ext4_acl_entry_short);
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} else {
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return sizeof(ext4_acl_header) +
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4 * sizeof(ext4_acl_entry_short) +
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(count - 4) * sizeof(ext4_acl_entry);
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}
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}
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static inline int ext4_acl_count(size_t size)
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{
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ssize_t s;
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size -= sizeof(ext4_acl_header);
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s = size - 4 * sizeof(ext4_acl_entry_short);
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if (s < 0) {
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if (size % sizeof(ext4_acl_entry_short))
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return -1;
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return size / sizeof(ext4_acl_entry_short);
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} else {
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if (s % sizeof(ext4_acl_entry))
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return -1;
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return s / sizeof(ext4_acl_entry) + 4;
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}
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}
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#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
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/* Value for inode->u.ext4_i.i_acl and inode->u.ext4_i.i_default_acl
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if the ACL has not been cached */
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#define EXT4_ACL_NOT_CACHED ((void *)-1)
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/* acl.c */
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extern int ext4_permission (struct inode *, int, struct nameidata *);
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extern int ext4_acl_chmod (struct inode *);
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extern int ext4_init_acl (handle_t *, struct inode *, struct inode *);
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#else /* CONFIG_EXT4DEV_FS_POSIX_ACL */
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#include <linux/sched.h>
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#define ext4_permission NULL
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static inline int
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ext4_acl_chmod(struct inode *inode)
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{
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return 0;
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}
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static inline int
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ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
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{
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return 0;
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}
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#endif /* CONFIG_EXT4DEV_FS_POSIX_ACL */
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