From: Andreas Gruenbacher <agruenba@redhat.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
"Theodore Ts'o" <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
"J. Bruce Fields" <bfields@fieldses.org>,
Jeff Layton <jlayton@poochiereds.net>,
Trond Myklebust <trond.myklebust@primarydata.com>,
Anna Schumaker <anna.schumaker@netapp.com>,
Dave Chinner <david@fromorbit.com>,
linux-ext4@vger.kernel.org, xfs@oss.sgi.com,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
linux-api@vger.kernel.org
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Subject: [PATCH v14 19/22] richacl: Add richacl xattr handler
Date: Thu, 5 Nov 2015 12:39:37 +0100 [thread overview]
Message-ID: <1446723580-3747-20-git-send-email-agruenba@redhat.com> (raw)
In-Reply-To: <1446723580-3747-1-git-send-email-agruenba@redhat.com>
Add richacl xattr handler implementing the xattr operations based on the
get_richacl and set_richacl inode operations.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/richacl_xattr.c | 78 +++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl_xattr.h | 2 ++
2 files changed, 80 insertions(+)
diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
index 38473b6..767c1f7 100644
--- a/fs/richacl_xattr.c
+++ b/fs/richacl_xattr.c
@@ -18,7 +18,9 @@
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/xattr.h>
#include <linux/richacl_xattr.h>
+#include <uapi/linux/xattr.h>
MODULE_LICENSE("GPL");
@@ -161,6 +163,82 @@ richacl_to_xattr(struct user_namespace *user_ns,
}
EXPORT_SYMBOL_GPL(richacl_to_xattr);
+static size_t
+richacl_xattr_list(struct dentry *dentry, char *list, size_t list_len,
+ const char *name, size_t name_len, int handler_flags)
+{
+ const size_t size = sizeof(XATTR_NAME_RICHACL);
+
+ if (!IS_RICHACL(d_backing_inode(dentry)))
+ return 0;
+ if (list && size <= list_len)
+ memcpy(list, XATTR_NAME_RICHACL, size);
+ return size;
+}
+
+static int
+richacl_xattr_get(struct dentry *dentry, const char *name, void *buffer,
+ size_t buffer_size, int handler_flags)
+{
+ struct inode *inode = d_backing_inode(dentry);
+ struct richacl *acl;
+ int error;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ if (!IS_RICHACL(inode))
+ return EOPNOTSUPP;
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ acl = get_richacl(inode);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+ error = richacl_to_xattr(&init_user_ns, acl, buffer, buffer_size);
+ richacl_put(acl);
+ return error;
+}
+
+static int
+richacl_xattr_set(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags, int handler_flags)
+{
+ struct inode *inode = d_backing_inode(dentry);
+ struct richacl *acl = NULL;
+ int ret;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ if (!IS_RICHACL(inode))
+ return -EOPNOTSUPP;
+ if (!inode->i_op->set_richacl)
+ return -EOPNOTSUPP;
+
+ if (!uid_eq(current_fsuid(), inode->i_uid) &&
+ inode_permission(inode, MAY_CHMOD) &&
+ !capable(CAP_FOWNER))
+ return -EPERM;
+
+ if (value) {
+ acl = richacl_from_xattr(&init_user_ns, value, size);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ }
+
+ ret = inode->i_op->set_richacl(inode, acl);
+ richacl_put(acl);
+ return ret;
+}
+
+struct xattr_handler richacl_xattr_handler = {
+ .prefix = XATTR_NAME_RICHACL,
+ .list = richacl_xattr_list,
+ .get = richacl_xattr_get,
+ .set = richacl_xattr_set,
+};
+EXPORT_SYMBOL(richacl_xattr_handler);
+
/*
* Fix up the uids and gids in richacl extended attributes in place.
*/
diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
index 7fc5ca8..45ec27a 100644
--- a/include/linux/richacl_xattr.h
+++ b/include/linux/richacl_xattr.h
@@ -39,4 +39,6 @@ static inline void richacl_fix_xattr_to_user(void *value, size_t size)
}
#endif
+extern struct xattr_handler richacl_xattr_handler;
+
#endif /* __RICHACL_XATTR_H */
--
2.5.0
next prev parent reply other threads:[~2015-11-05 11:42 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-05 11:39 [PATCH v14 00/22] Richacls (Core and Ext4) Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 01/22] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher
2015-11-06 20:40 ` Andreas Dilger
2015-11-05 11:39 ` [PATCH v14 02/22] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher
2015-11-06 20:58 ` Andreas Dilger
2015-11-07 17:44 ` Andreas Gruenbacher
2015-11-08 8:18 ` Andreas Dilger
2015-11-05 11:39 ` [PATCH v14 03/22] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD " Andreas Gruenbacher
2015-11-06 21:26 ` Andreas Dilger
2015-11-07 20:47 ` Andreas Gruenbacher
2015-11-06 21:26 ` Andreas Dilger
2015-11-05 11:39 ` [PATCH v14 04/22] vfs: Make the inode passed to inode_change_ok non-const Andreas Gruenbacher
2015-11-06 21:04 ` Andreas Dilger
2015-11-05 11:39 ` [PATCH v14 05/22] vfs: Add permission flags for setting file attributes Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 06/22] richacl: In-memory representation and helper functions Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 07/22] richacl: Permission mapping functions Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 08/22] richacl: Compute maximum file masks from an acl Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 09/22] richacl: Permission check algorithm Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 10/22] posix_acl: Unexport acl_by_type and make it static Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 11/22] vfs: Cache base_acl objects in inodes Andreas Gruenbacher
2015-11-08 8:06 ` Andreas Dilger
2015-11-05 11:39 ` [PATCH v14 12/22] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 13/22] vfs: Cache richacl in struct inode Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 14/22] richacl: Update the file masks in chmod() Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 15/22] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 16/22] richacl: Create-time inheritance Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 17/22] richacl: Automatic Inheritance Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 18/22] richacl: xattr mapping functions Andreas Gruenbacher
2015-11-05 11:39 ` Andreas Gruenbacher [this message]
2015-11-05 11:39 ` [PATCH v14 20/22] vfs: Add richacl permission checking Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 21/22] ext4: Add richacl support Andreas Gruenbacher
2015-11-05 11:39 ` [PATCH v14 22/22] ext4: Add richacl feature flag Andreas Gruenbacher
2015-11-08 8:12 ` Andreas Dilger
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