1d5ccd1c42
Don't implement per-filesystem 'extX_permission()' functions that have to be called for every path component operation, and instead just expose the actual ACL checking so that the VFS layer can now do it for us. Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
/*
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File: fs/ext2/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 EXT2_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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} ext2_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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} ext2_acl_entry_short;
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typedef struct {
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__le32 a_version;
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} ext2_acl_header;
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static inline size_t ext2_acl_size(int count)
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{
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if (count <= 4) {
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return sizeof(ext2_acl_header) +
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count * sizeof(ext2_acl_entry_short);
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} else {
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return sizeof(ext2_acl_header) +
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4 * sizeof(ext2_acl_entry_short) +
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(count - 4) * sizeof(ext2_acl_entry);
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}
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}
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static inline int ext2_acl_count(size_t size)
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{
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ssize_t s;
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size -= sizeof(ext2_acl_header);
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s = size - 4 * sizeof(ext2_acl_entry_short);
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if (s < 0) {
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if (size % sizeof(ext2_acl_entry_short))
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return -1;
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return size / sizeof(ext2_acl_entry_short);
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} else {
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if (s % sizeof(ext2_acl_entry))
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return -1;
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return s / sizeof(ext2_acl_entry) + 4;
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}
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}
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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/* acl.c */
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extern int ext2_check_acl (struct inode *, int);
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extern int ext2_acl_chmod (struct inode *);
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extern int ext2_init_acl (struct inode *, struct inode *);
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#else
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#include <linux/sched.h>
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#define ext2_check_acl NULL
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#define ext2_get_acl NULL
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#define ext2_set_acl NULL
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static inline int
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ext2_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 ext2_init_acl (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
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