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>

diff --git a/fs/hfsplus/Kconfig b/fs/hfsplus/Kconfig
index a63371815aaba6a0dfda4399b3b5cf8f789b15c2..24bc20fd42f7b93081d8c22954a5a38ec44d3037 100644 (file)
--- a/fs/hfsplus/Kconfig
+++ b/fs/hfsplus/Kconfig
@@ -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

diff --git a/fs/hfsplus/acl.h b/fs/hfsplus/acl.h
new file mode 100644 (file)
index 0000000..07c0d49
--- /dev/null
+++ b/fs/hfsplus/acl.h
@@ -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 */

diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index ede79317cfb8cf5fa521dd187465a8cd63787979..2b9cd01696e2081a7a003ff3e52d261eb51db51c 100644 (file)
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -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)