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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [ext4/] [acl.h] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/*
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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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