| 1 | /* |
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| 2 | File: linux/posix_acl_xattr.h |
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| 3 | |
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| 4 | Extended attribute system call representation of Access Control Lists. |
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| 5 | |
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| 6 | Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org> |
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| 7 | Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com> |
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| 8 | */ |
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| 9 | #ifndef _POSIX_ACL_XATTR_H |
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| 10 | #define _POSIX_ACL_XATTR_H |
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| 11 | |
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| 12 | #include <asm/types.h> |
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| 13 | |
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| 14 | #include <linux/posix_acl.h> |
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| 15 | |
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| 16 | /* Extended attribute names */ |
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| 17 | #define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access" |
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| 18 | #define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default" |
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| 19 | |
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| 20 | /* Supported ACL a_version fields */ |
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| 21 | #define POSIX_ACL_XATTR_VERSION 0x0002 |
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| 22 | |
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| 23 | |
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| 24 | /* An undefined entry e_id value */ |
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| 25 | #define ACL_UNDEFINED_ID (-1) |
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| 26 | |
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| 27 | typedef struct { |
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| 28 | __u16 e_tag; |
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| 29 | __u16 e_perm; |
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| 30 | __u32 e_id; |
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| 31 | } posix_acl_xattr_entry; |
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| 32 | |
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| 33 | typedef struct { |
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| 34 | __u32 a_version; |
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| 35 | posix_acl_xattr_entry a_entries[0]; |
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| 36 | } posix_acl_xattr_header; |
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| 37 | |
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| 38 | |
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| 39 | static inline size_t |
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| 40 | posix_acl_xattr_size(int count) |
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| 41 | { |
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| 42 | return (sizeof(posix_acl_xattr_header) + |
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| 43 | (count * sizeof(posix_acl_xattr_entry))); |
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| 44 | } |
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| 45 | |
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| 46 | static inline int |
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| 47 | posix_acl_xattr_count(size_t size) |
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| 48 | { |
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| 49 | if (size < sizeof(posix_acl_xattr_header)) |
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| 50 | return -1; |
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| 51 | size -= sizeof(posix_acl_xattr_header); |
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| 52 | if (size % sizeof(posix_acl_xattr_entry)) |
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| 53 | return -1; |
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| 54 | return size / sizeof(posix_acl_xattr_entry); |
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| 55 | } |
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| 56 | |
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| 57 | #endif /* _POSIX_ACL_XATTR_H */ |
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