[PATCH] squashfs-tools: Add posix acl support

[Geliang Tang <geliangtang@gmail.com>]

Add posix acl (Access Control Lists) support for mksquashfs and
unsquashfs tools.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
---
 squashfs-tools/read_xattrs.c      |  2 ++
 squashfs-tools/squashfs_fs.h      | 12 +++++++-----
 squashfs-tools/unsquashfs_xattr.c |  4 +++-
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/squashfs-tools/read_xattrs.c b/squashfs-tools/read_xattrs.c
index 42106f5..8ef8291 100644
--- a/squashfs-tools/read_xattrs.c
+++ b/squashfs-tools/read_xattrs.c
@@ -64,6 +64,8 @@ static long long xattr_table_start;
  */
 struct prefix prefix_table[] = {
 	{ "user.", SQUASHFS_XATTR_USER },
+	{ "system.", SQUASHFS_XATTR_POSIX_ACL_ACCESS },
+	{ "system.", SQUASHFS_XATTR_POSIX_ACL_DEFAULT },
 	{ "trusted.", SQUASHFS_XATTR_TRUSTED },
 	{ "security.", SQUASHFS_XATTR_SECURITY },
 	{ "", -1 }
diff --git a/squashfs-tools/squashfs_fs.h b/squashfs-tools/squashfs_fs.h
index afca918..040035c 100644
--- a/squashfs-tools/squashfs_fs.h
+++ b/squashfs-tools/squashfs_fs.h
@@ -122,11 +122,13 @@
 #define SQUASHFS_LSOCKET_TYPE		14
 
 /* Xattr types */
-#define SQUASHFS_XATTR_USER		0
-#define SQUASHFS_XATTR_TRUSTED		1
-#define SQUASHFS_XATTR_SECURITY		2
-#define SQUASHFS_XATTR_VALUE_OOL	256
-#define SQUASHFS_XATTR_PREFIX_MASK	0xff
+#define SQUASHFS_XATTR_USER			0
+#define SQUASHFS_XATTR_POSIX_ACL_ACCESS		1
+#define SQUASHFS_XATTR_POSIX_ACL_DEFAULT	2
+#define SQUASHFS_XATTR_TRUSTED			3
+#define SQUASHFS_XATTR_SECURITY			4
+#define SQUASHFS_XATTR_VALUE_OOL		256
+#define SQUASHFS_XATTR_PREFIX_MASK		0xff
 
 /* Flag whether block is compressed or uncompressed, bit is set if block is
  * uncompressed */
diff --git a/squashfs-tools/unsquashfs_xattr.c b/squashfs-tools/unsquashfs_xattr.c
index 59f4aae..34aae84 100644
--- a/squashfs-tools/unsquashfs_xattr.c
+++ b/squashfs-tools/unsquashfs_xattr.c
@@ -57,7 +57,9 @@ void write_xattr(char *pathname, unsigned int xattr)
 		if(user_xattrs && prefix != SQUASHFS_XATTR_USER)
 			continue;
 
-		if(root_process || prefix == SQUASHFS_XATTR_USER) {
+		if(root_process || prefix == SQUASHFS_XATTR_USER
+				|| prefix == SQUASHFS_XATTR_POSIX_ACL_ACCESS
+				|| prefix == SQUASHFS_XATTR_POSIX_ACL_DEFAULT) {
 			int res = lsetxattr(pathname, xattr_list[i].full_name,
 				xattr_list[i].value, xattr_list[i].vsize, 0);
 
-- 
2.14.1