1 files changed, 197 insertions, 0 deletions
diff --git a/fs/generic_acl.c b/fs/generic_acl.c
new file mode 100644
index 000000000000..9ccb78947171
--- /dev/null
+++ b/fs/generic_acl.c
@@ -0,0 +1,197 @@
+/*
+ * fs/generic_acl.c
+ *
+ * (C) 2005 Andreas Gruenbacher <agruen@suse.de>
+ *
+ * This file is released under the GPL.
+ */
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/generic_acl.h>
+/**
+ * generic_acl_list  -  Generic xattr_handler->list() operation
+ * @ops:        Filesystem specific getacl and setacl callbacks
+ */
+size_t
+generic_acl_list(struct inode *inode, struct generic_acl_operations *ops,
+                 int type, char *list, size_t list_size)
+{
+        struct posix_acl *acl;
+        const char *name;
+        size_t size;
+        acl = ops->getacl(inode, type);
+        if (!acl)
+                return 0;
+        posix_acl_release(acl);
+        switch(type) {
+                case ACL_TYPE_ACCESS:
+                        name = POSIX_ACL_XATTR_ACCESS;
+                        break;
+                case ACL_TYPE_DEFAULT:
+                        name = POSIX_ACL_XATTR_DEFAULT;
+                        break;
+                default:
+                        return 0;
+        }
+        size = strlen(name) + 1;
+        if (list && size <= list_size)
+                memcpy(list, name, size);
+        return size;
+}
+/**
+ * generic_acl_get  -  Generic xattr_handler->get() operation
+ * @ops:        Filesystem specific getacl and setacl callbacks
+ */
+int
+generic_acl_get(struct inode *inode, struct generic_acl_operations *ops,
+                int type, void *buffer, size_t size)
+{
+        struct posix_acl *acl;
+        int error;
+        acl = ops->getacl(inode, type);
+        if (!acl)
+                return -ENODATA;
+        error = posix_acl_to_xattr(acl, buffer, size);
+        posix_acl_release(acl);
+        return error;
+}
+/**
+ * generic_acl_set  -  Generic xattr_handler->set() operation
+ * @ops:        Filesystem specific getacl and setacl callbacks
+ */
+int
+generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
+                int type, const void *value, size_t size)
+{
+        struct posix_acl *acl = NULL;
+        int error;
+        if (S_ISLNK(inode->i_mode))
+                return -EOPNOTSUPP;
+        if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
+                return -EPERM;
+        if (value) {
+                acl = posix_acl_from_xattr(value, size);
+                if (IS_ERR(acl))
+                        return PTR_ERR(acl);
+        }
+        if (acl) {
+                mode_t mode;
+                error = posix_acl_valid(acl);
+                if (error)
+                        goto failed;
+                switch(type) {
+                        case ACL_TYPE_ACCESS:
+                                mode = inode->i_mode;
+                                error = posix_acl_equiv_mode(acl, &mode);
+                                if (error < 0)
+                                        goto failed;
+                                inode->i_mode = mode;
+                                if (error == 0) {
+                                        posix_acl_release(acl);
+                                        acl = NULL;
+                                }
+                                break;
+                        case ACL_TYPE_DEFAULT:
+                                if (!S_ISDIR(inode->i_mode)) {
+                                        error = -EINVAL;
+                                        goto failed;
+                                }
+                                break;
+                }
+        }
+        ops->setacl(inode, type, acl);
+        error = 0;
+failed:
+        posix_acl_release(acl);
+        return error;
+}
+/**
+ * generic_acl_init  -  Take care of acl inheritance at @inode create time
+ * @ops:        Filesystem specific getacl and setacl callbacks
+ *
+ * Files created inside a directory with a default ACL inherit the
+ * directory's default ACL.
+ */
+int
+generic_acl_init(struct inode *inode, struct inode *dir,
+                 struct generic_acl_operations *ops)
+{
+        struct posix_acl *acl = NULL;
+        mode_t mode = inode->i_mode;
+        int error;
+        inode->i_mode = mode & ~current->fs->umask;
+        if (!S_ISLNK(inode->i_mode))
+                acl = ops->getacl(dir, ACL_TYPE_DEFAULT);
+        if (acl) {
+                struct posix_acl *clone;
+                if (S_ISDIR(inode->i_mode)) {
+                        clone = posix_acl_clone(acl, GFP_KERNEL);
+                        error = -ENOMEM;
+                        if (!clone)
+                                goto cleanup;
+                        ops->setacl(inode, ACL_TYPE_DEFAULT, clone);
+                        posix_acl_release(clone);
+                }
+                clone = posix_acl_clone(acl, GFP_KERNEL);
+                error = -ENOMEM;
+                if (!clone)
+                        goto cleanup;
+                error = posix_acl_create_masq(clone, &mode);
+                if (error >= 0) {
+                        inode->i_mode = mode;
+                        if (error > 0)
+                                ops->setacl(inode, ACL_TYPE_ACCESS, clone);
+                }
+                posix_acl_release(clone);
+        }
+        error = 0;
+cleanup:
+        posix_acl_release(acl);
+        return error;
+}
+/**
+ * generic_acl_chmod  -  change the access acl of @inode upon chmod()
+ * @ops:        FIlesystem specific getacl and setacl callbacks
+ *
+ * A chmod also changes the permissions of the owner, group/mask, and
+ * other ACL entries.
+ */
+int
+generic_acl_chmod(struct inode *inode, struct generic_acl_operations *ops)
+{
+        struct posix_acl *acl, *clone;
+        int error = 0;
+        if (S_ISLNK(inode->i_mode))
+                return -EOPNOTSUPP;
+        acl = ops->getacl(inode, ACL_TYPE_ACCESS);
+        if (acl) {
+                clone = posix_acl_clone(acl, GFP_KERNEL);
+                posix_acl_release(acl);
+                if (!clone)
+                        return -ENOMEM;
+                error = posix_acl_chmod_masq(clone, inode->i_mode);
+                if (!error)
+                        ops->setacl(inode, ACL_TYPE_ACCESS, clone);
+                posix_acl_release(clone);
+        }
+        return error;
+}

diff --git a/fs/generic_acl.c b/fs/generic_acl.c new file mode 100644 index 000000000000..9ccb78947171 --- /dev/null +++ b/fs/generic_acl.c
@@ -0,0 +1,197 @@
	1	/*
	2	* fs/generic_acl.c
	3	*
	4	* (C) 2005 Andreas Gruenbacher <agruen@suse.de>
	5	*
	6	* This file is released under the GPL.
	7	*/
	8
	9	#include <linux/sched.h>
	10	#include <linux/fs.h>
	11	#include <linux/generic_acl.h>
	12
	13	/**
	14	* generic_acl_list - Generic xattr_handler->list() operation
	15	* @ops: Filesystem specific getacl and setacl callbacks
	16	*/
	17	size_t
	18	generic_acl_list(struct inode inode, struct generic_acl_operations ops,
	19	int type, char *list, size_t list_size)
	20	{
	21	struct posix_acl *acl;
	22	const char *name;
	23	size_t size;
	24
	25	acl = ops->getacl(inode, type);
	26	if (!acl)
	27	return 0;
	28	posix_acl_release(acl);
	29
	30	switch(type) {
	31	case ACL_TYPE_ACCESS:
	32	name = POSIX_ACL_XATTR_ACCESS;
	33	break;
	34
	35	case ACL_TYPE_DEFAULT:
	36	name = POSIX_ACL_XATTR_DEFAULT;
	37	break;
	38
	39	default:
	40	return 0;
	41	}
	42	size = strlen(name) + 1;
	43	if (list && size <= list_size)
	44	memcpy(list, name, size);
	45	return size;
	46	}
	47
	48	/**
	49	* generic_acl_get - Generic xattr_handler->get() operation
	50	* @ops: Filesystem specific getacl and setacl callbacks
	51	*/
	52	int
	53	generic_acl_get(struct inode inode, struct generic_acl_operations ops,
	54	int type, void *buffer, size_t size)
	55	{
	56	struct posix_acl *acl;
	57	int error;
	58
	59	acl = ops->getacl(inode, type);
	60	if (!acl)
	61	return -ENODATA;
	62	error = posix_acl_to_xattr(acl, buffer, size);
	63	posix_acl_release(acl);
	64
	65	return error;
	66	}
	67
	68	/**
	69	* generic_acl_set - Generic xattr_handler->set() operation
	70	* @ops: Filesystem specific getacl and setacl callbacks
	71	*/
	72	int
	73	generic_acl_set(struct inode inode, struct generic_acl_operations ops,
	74	int type, const void *value, size_t size)
	75	{
	76	struct posix_acl *acl = NULL;
	77	int error;
	78
	79	if (S_ISLNK(inode->i_mode))
	80	return -EOPNOTSUPP;
	81	if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
	82	return -EPERM;
	83	if (value) {
	84	acl = posix_acl_from_xattr(value, size);
	85	if (IS_ERR(acl))
	86	return PTR_ERR(acl);
	87	}
	88	if (acl) {
	89	mode_t mode;
	90
	91	error = posix_acl_valid(acl);
	92	if (error)
	93	goto failed;
	94	switch(type) {
	95	case ACL_TYPE_ACCESS:
	96	mode = inode->i_mode;
	97	error = posix_acl_equiv_mode(acl, &mode);
	98	if (error < 0)
	99	goto failed;
	100	inode->i_mode = mode;
	101	if (error == 0) {
	102	posix_acl_release(acl);
	103	acl = NULL;
	104	}
	105	break;
	106
	107	case ACL_TYPE_DEFAULT:
	108	if (!S_ISDIR(inode->i_mode)) {
	109	error = -EINVAL;
	110	goto failed;
	111	}
	112	break;
	113	}
	114	}
	115	ops->setacl(inode, type, acl);
	116	error = 0;
	117	failed:
	118	posix_acl_release(acl);
	119	return error;
	120	}
	121
	122	/**
	123	* generic_acl_init - Take care of acl inheritance at @inode create time
	124	* @ops: Filesystem specific getacl and setacl callbacks
	125	*
	126	* Files created inside a directory with a default ACL inherit the
	127	* directory's default ACL.
	128	*/
	129	int
	130	generic_acl_init(struct inode inode, struct inode dir,
	131	struct generic_acl_operations *ops)
	132	{
	133	struct posix_acl *acl = NULL;
	134	mode_t mode = inode->i_mode;
	135	int error;
	136
	137	inode->i_mode = mode & ~current->fs->umask;
	138	if (!S_ISLNK(inode->i_mode))
	139	acl = ops->getacl(dir, ACL_TYPE_DEFAULT);
	140	if (acl) {
	141	struct posix_acl *clone;
	142
	143	if (S_ISDIR(inode->i_mode)) {
	144	clone = posix_acl_clone(acl, GFP_KERNEL);
	145	error = -ENOMEM;
	146	if (!clone)
	147	goto cleanup;
	148	ops->setacl(inode, ACL_TYPE_DEFAULT, clone);
	149	posix_acl_release(clone);
	150	}
	151	clone = posix_acl_clone(acl, GFP_KERNEL);
	152	error = -ENOMEM;
	153	if (!clone)
	154	goto cleanup;
	155	error = posix_acl_create_masq(clone, &mode);
	156	if (error >= 0) {
	157	inode->i_mode = mode;
	158	if (error > 0)
	159	ops->setacl(inode, ACL_TYPE_ACCESS, clone);
	160	}
	161	posix_acl_release(clone);
	162	}
	163	error = 0;
	164
	165	cleanup:
	166	posix_acl_release(acl);
	167	return error;
	168	}
	169
	170	/**
	171	* generic_acl_chmod - change the access acl of @inode upon chmod()
	172	* @ops: FIlesystem specific getacl and setacl callbacks
	173	*
	174	* A chmod also changes the permissions of the owner, group/mask, and
	175	* other ACL entries.
	176	*/
	177	int
	178	generic_acl_chmod(struct inode inode, struct generic_acl_operations ops)
	179	{
	180	struct posix_acl acl, clone;
	181	int error = 0;
	182
	183	if (S_ISLNK(inode->i_mode))
	184	return -EOPNOTSUPP;
	185	acl = ops->getacl(inode, ACL_TYPE_ACCESS);
	186	if (acl) {
	187	clone = posix_acl_clone(acl, GFP_KERNEL);
	188	posix_acl_release(acl);
	189	if (!clone)
	190	return -ENOMEM;
	191	error = posix_acl_chmod_masq(clone, inode->i_mode);
	192	if (!error)
	193	ops->setacl(inode, ACL_TYPE_ACCESS, clone);
	194	posix_acl_release(clone);
	195	}
	196	return error;
	197	}