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hfsplus: add necessary declarations for POSIX ACLs support 

This patchset implements POSIX ACLs support in hfsplus driver.

Mac OS X beginning with version 10.4 ("Tiger") support NFSv4 ACLs, which
are part of the NFSv4 standard.  HFS+ stores ACLs in the form of
specially named extended attributes (com.apple.system.Security).

But this patchset doesn't use "com.apple.system.Security" extended
attributes.  It implements support of POSIX ACLs in the form of extended
attributes with names "system.posix_acl_access" and
"system.posix_acl_default".  These xattrs are treated only under Linux.
POSIX ACLs doesn't mean something under Mac OS X.  Thereby, this patch
set provides opportunity to use POSIX ACLs under Linux on HFS+
filesystem.

This patch:

Add CONFIG_HFSPLUS_FS_POSIX_ACL kernel configuration option, DBG_ACL_MOD
debugging flag and acl.h file with declaration of essential functions
for support POSIX ACLs in hfsplus driver.

Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Hin-Tak Leung <htl10@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vyacheslav Dubeyko 2013-09-11 14:24:28 -07:00 committed by Linus Torvalds
parent 7c1d69ee11
commit 2c92057e45
3 changed files with 49 additions and 0 deletions
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18
fs/hfsplus/Kconfig
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@ -11,3 +11,21 @@ config HFSPLUS_FS
MacOS 8. It includes all Mac specific filesystem data such as
data forks and creator codes, but it also has several UNIX
style features such as file ownership and permissions.
config HFSPLUS_FS_POSIX_ACL
bool "HFS+ POSIX Access Control Lists"
depends on HFSPLUS_FS
select FS_POSIX_ACL
help
POSIX Access Control Lists (ACLs) support permissions for users and
groups beyond the owner/group/world scheme.
To learn more about Access Control Lists, visit the POSIX ACLs for
Linux website <http://acl.bestbits.at/>.
It needs to understand that POSIX ACLs are treated only under
Linux. POSIX ACLs doesn't mean something under Mac OS X.
Mac OS X beginning with version 10.4 ("Tiger") support NFSv4 ACLs,
which are part of the NFSv4 standard.
If you don't know what Access Control Lists are, say N

30
fs/hfsplus/acl.h Normal file
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@ -0,0 +1,30 @@
/*
* linux/fs/hfsplus/acl.h
*
* Vyacheslav Dubeyko <slava@dubeyko.com>
*
* Handler for Posix Access Control Lists (ACLs) support.
*/
#include <linux/posix_acl_xattr.h>
#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
/* posix_acl.c */
struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type);
extern int hfsplus_posix_acl_chmod(struct inode *);
extern int hfsplus_init_posix_acl(struct inode *, struct inode *);
#else /* CONFIG_HFSPLUS_FS_POSIX_ACL */
#define hfsplus_get_posix_acl NULL
static inline int hfsplus_posix_acl_chmod(struct inode *inode)
{
return 0;
}
static inline int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
{
return 0;
}
#endif /* CONFIG_HFSPLUS_FS_POSIX_ACL */

1
fs/hfsplus/hfsplus_fs.h
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@ -30,6 +30,7 @@
#define DBG_EXTENT 0x00000020
#define DBG_BITMAP 0x00000040
#define DBG_ATTR_MOD 0x00000080
#define DBG_ACL_MOD 0x00000100
#if 0
#define DBG_MASK (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD)