X-Git-Url: http://nv-tegra.nvidia.com/gitweb/?p=linux-2.6.git;a=blobdiff_plain;f=fs%2Fposix_acl.c;h=4e16e80019825864fd84239b883e0df1064b09c0;hp=6c8dcf7613fd89bf903a95b311af8a1eee2bf8ce;hb=3a5fba19b080b365d67866db38e32e6a4a2089e8;hpb=dd0fc66fb33cd610bc1a5db8a5e232d34879b4d7

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 6c8dcf7..4e16e80 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -14,7 +14,7 @@
 
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
 #include <linux/fs.h>
 #include <linux/sched.h>
 #include <linux/posix_acl.h>
@@ -22,14 +22,21 @@
 
 #include <linux/errno.h>
 
+EXPORT_SYMBOL(posix_acl_init);
 EXPORT_SYMBOL(posix_acl_alloc);
-EXPORT_SYMBOL(posix_acl_clone);
 EXPORT_SYMBOL(posix_acl_valid);
 EXPORT_SYMBOL(posix_acl_equiv_mode);
 EXPORT_SYMBOL(posix_acl_from_mode);
-EXPORT_SYMBOL(posix_acl_create_masq);
-EXPORT_SYMBOL(posix_acl_chmod_masq);
-EXPORT_SYMBOL(posix_acl_permission);
+
+/*
+ * Init a fresh posix_acl
+ */
+void
+posix_acl_init(struct posix_acl *acl, int count)
+{
+	atomic_set(&acl->a_refcount, 1);
+	acl->a_count = count;
+}
 
 /*
  * Allocate a new ACL with the specified number of entries.
@@ -40,17 +47,15 @@ posix_acl_alloc(int count, gfp_t flags)
 	const size_t size = sizeof(struct posix_acl) +
 	                    count * sizeof(struct posix_acl_entry);
 	struct posix_acl *acl = kmalloc(size, flags);
-	if (acl) {
-		atomic_set(&acl->a_refcount, 1);
-		acl->a_count = count;
-	}
+	if (acl)
+		posix_acl_init(acl, count);
 	return acl;
 }
 
 /*
  * Clone an ACL.
  */
-struct posix_acl *
+static struct posix_acl *
 posix_acl_clone(const struct posix_acl *acl, gfp_t flags)
 {
 	struct posix_acl *clone = NULL;
@@ -58,11 +63,9 @@ posix_acl_clone(const struct posix_acl *acl, gfp_t flags)
 	if (acl) {
 		int size = sizeof(struct posix_acl) + acl->a_count *
 		           sizeof(struct posix_acl_entry);
-		clone = kmalloc(size, flags);
-		if (clone) {
-			memcpy(clone, acl, size);
+		clone = kmemdup(acl, size, flags);
+		if (clone)
 			atomic_set(&clone->a_refcount, 1);
-		}
 	}
 	return clone;
 }
@@ -146,10 +149,10 @@ posix_acl_valid(const struct posix_acl *acl)
  * file mode permission bits, or else 1. Returns -E... on error.
  */
 int
-posix_acl_equiv_mode(const struct posix_acl *acl, mode_t *mode_p)
+posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p)
 {
 	const struct posix_acl_entry *pa, *pe;
-	mode_t mode = 0;
+	umode_t mode = 0;
 	int not_equiv = 0;
 
 	FOREACH_ACL_ENTRY(pa, acl, pe) {
@@ -185,7 +188,7 @@ posix_acl_equiv_mode(const struct posix_acl *acl, mode_t *mode_p)
  * Create an ACL representing the file mode permission bits of an inode.
  */
 struct posix_acl *
-posix_acl_from_mode(mode_t mode, gfp_t flags)
+posix_acl_from_mode(umode_t mode, gfp_t flags)
 {
 	struct posix_acl *acl = posix_acl_alloc(3, flags);
 	if (!acl)
@@ -219,11 +222,11 @@ posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want)
                 switch(pa->e_tag) {
                         case ACL_USER_OBJ:
 				/* (May have been checked already) */
-                                if (inode->i_uid == current->fsuid)
+				if (inode->i_uid == current_fsuid())
                                         goto check_perm;
                                 break;
                         case ACL_USER:
-                                if (pa->e_id == current->fsuid)
+				if (pa->e_id == current_fsuid())
                                         goto mask;
 				break;
                         case ACL_GROUP_OBJ:
@@ -276,12 +279,11 @@ check_perm:
  * system calls. All permissions that are not granted by the acl are removed.
  * The permissions in the acl are changed to reflect the mode_p parameter.
  */
-int
-posix_acl_create_masq(struct posix_acl *acl, mode_t *mode_p)
+static int posix_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
 {
 	struct posix_acl_entry *pa, *pe;
 	struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
-	mode_t mode = *mode_p;
+	umode_t mode = *mode_p;
 	int not_equiv = 0;
 
 	/* assert(atomic_read(acl->a_refcount) == 1); */
@@ -334,8 +336,7 @@ posix_acl_create_masq(struct posix_acl *acl, mode_t *mode_p)
 /*
  * Modify the ACL for the chmod syscall.
  */
-int
-posix_acl_chmod_masq(struct posix_acl *acl, mode_t mode)
+static int posix_acl_chmod_masq(struct posix_acl *acl, mode_t mode)
 {
 	struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
 	struct posix_acl_entry *pa, *pe;
@@ -379,3 +380,39 @@ posix_acl_chmod_masq(struct posix_acl *acl, mode_t mode)
 
 	return 0;
 }
+
+int
+posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p)
+{
+	struct posix_acl *clone = posix_acl_clone(*acl, gfp);
+	int err = -ENOMEM;
+	if (clone) {
+		err = posix_acl_create_masq(clone, mode_p);
+		if (err < 0) {
+			posix_acl_release(clone);
+			clone = NULL;
+		}
+	}
+	posix_acl_release(*acl);
+	*acl = clone;
+	return err;
+}
+EXPORT_SYMBOL(posix_acl_create);
+
+int
+posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, mode_t mode)
+{
+	struct posix_acl *clone = posix_acl_clone(*acl, gfp);
+	int err = -ENOMEM;
+	if (clone) {
+		err = posix_acl_chmod_masq(clone, mode);
+		if (err) {
+			posix_acl_release(clone);
+			clone = NULL;
+		}
+	}
+	posix_acl_release(*acl);
+	*acl = clone;
+	return err;
+}
+EXPORT_SYMBOL(posix_acl_chmod);