[patch 17/40] reiserfs: use generic xattr handlers

[jeffm@suse.com]

[-- Attachment #1: reiserfs-use-generic-xattr-handlers.diff --]
[-- Type: text/plain, Size: 31530 bytes --]

 Christoph Hellwig had asked me quite some time ago to port the reiserfs
 xattrs to the generic xattr interface.

 This patch replaces the reiserfs-specific xattr handling code with the
 generic struct xattr_handler.

 However, since reiserfs doesn't split the prefix and name when accessing
 xattrs, it can't leverage generic_{set,get,list,remove}xattr without
 needlessly reconstructing the name on the back end.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>

---
 fs/reiserfs/super.c            |    7 
 fs/reiserfs/xattr.c            |  399 +++++++++++++++--------------------------
 fs/reiserfs/xattr_acl.c        |   72 ++-----
 fs/reiserfs/xattr_security.c   |   26 --
 fs/reiserfs/xattr_trusted.c    |   45 +---
 fs/reiserfs/xattr_user.c       |   30 ---
 include/linux/reiserfs_acl.h   |   16 -
 include/linux/reiserfs_fs_sb.h |    3 
 include/linux/reiserfs_xattr.h |   29 --
 9 files changed, 206 insertions(+), 421 deletions(-)

--- a/fs/reiserfs/super.c	2007-06-11 14:49:36.000000000 -0400
+++ b/fs/reiserfs/super.c	2007-06-11 14:50:04.000000000 -0400
@@ -2132,9 +2132,6 @@ static int __init init_reiserfs_fs(void)
 		return ret;
 	}
 
-	if ((ret = reiserfs_xattr_register_handlers()))
-		goto failed_reiserfs_xattr_register_handlers;
-
 	reiserfs_proc_info_global_init();
 	reiserfs_proc_register_global("version",
 				      reiserfs_global_version_in_proc);
@@ -2145,9 +2142,6 @@ static int __init init_reiserfs_fs(void)
 		return 0;
 	}
 
-	reiserfs_xattr_unregister_handlers();
-
-      failed_reiserfs_xattr_register_handlers:
 	reiserfs_proc_unregister_global("version");
 	reiserfs_proc_info_global_done();
 	destroy_inodecache();
@@ -2157,7 +2151,6 @@ static int __init init_reiserfs_fs(void)
 
 static void __exit exit_reiserfs_fs(void)
 {
-	reiserfs_xattr_unregister_handlers();
 	reiserfs_proc_unregister_global("version");
 	reiserfs_proc_info_global_done();
 	unregister_filesystem(&reiserfs_fs_type);
--- a/fs/reiserfs/xattr.c	2007-06-11 14:49:37.000000000 -0400
+++ b/fs/reiserfs/xattr.c	2007-06-11 14:50:06.000000000 -0400
@@ -53,8 +53,49 @@
 #define PRIVROOT_NAME ".reiserfs_priv"
 #define XAROOT_NAME   "xattrs"
 
-static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
-								*prefix);
+struct xattr_handler *reiserfs_xattr_handlers[] = {
+	&reiserfs_xattr_user_handler,
+	&reiserfs_xattr_trusted_handler,
+#ifdef CONFIG_REISERFS_FS_SECURITY
+	&reiserfs_xattr_security_handler,
+#endif
+#ifdef CONFIG_REISERFS_FS_POSIX_ACL
+	&reiserfs_posix_acl_access_handler,
+	&reiserfs_posix_acl_default_handler,
+#endif
+	NULL
+};
+
+/*
+ * In order to implement different sets of xattr operations for each xattr
+ * prefix with the generic xattr API, a filesystem should create a
+ * null-terminated array of struct xattr_handler (one for each prefix) and
+ * hang a pointer to it off of the s_xattr field of the superblock.
+ *
+ * The generic_fooxattr() functions will use this list to dispatch xattr
+ * operations to the correct xattr_handler.
+ */
+#define for_each_xattr_handler(handlers, handler)		\
+		for ((handler) = *(handlers)++;			\
+			(handler) != NULL;			\
+			(handler) = *(handlers)++)
+
+/* This is the implementation for the xattr plugin infrastructure */
+static inline struct xattr_handler *find_xattr_handler_prefix(struct xattr_handler **handlers,
+                                                       const char *name)
+{
+	struct xattr_handler *xah;
+
+	if (!handlers)
+		return NULL;
+
+	for_each_xattr_handler(handlers, xah) {
+		if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
+			break;
+	}
+
+	return xah;
+}
 
 #define xattr_may_create(flags)	(!flags || flags & XATTR_CREATE)
 
@@ -113,7 +154,7 @@ static struct dentry *open_xa_dir(const 
 
 }
 
-static struct file *open_xattr_file(const struct inode *inode,
+static struct file *open_xattr_file(struct inode *inode,
                                     const char *name, int flags)
 {
 	struct dentry *xadir, *xafile;
@@ -381,8 +422,27 @@ reiserfs_xattr_set(struct inode *inode, 
 	if (get_inode_sd_version(inode) == STAT_DATA_V1)
 		return -EOPNOTSUPP;
 
-	if (!buffer)
-		return reiserfs_xattr_del(inode, name);
+	/* Clearing it out - delete it. */
+	if (!buffer) {
+		struct inode *dir;
+
+		fp = open_xattr_file(inode, name, XATTR_REPLACE);
+		if (IS_ERR(fp)) {
+			err = PTR_ERR(fp);
+			if (err == -ENODATA)
+				err = 0;
+			return err;
+		}
+
+		dir = fp->f_path.dentry->d_parent->d_inode;
+		err = vfs_unlink(dir, fp->f_dentry);
+		fput(fp);
+		if (!err) {
+			inode->i_ctime = CURRENT_TIME_SEC;
+			mark_inode_dirty(inode);
+		}
+		return err;
+	}
 
 	fp = open_xattr_file(inode, name, flags);
 	if (IS_ERR(fp)) {
@@ -449,6 +509,12 @@ reiserfs_xattr_set(struct inode *inode, 
 			break;
 	}
 
+      out_filp:
+	mutex_unlock(&xinode->i_mutex);
+	fput(fp);
+
+      out:
+
 	/* We can't mark the inode dirty if it's not hashed. This is the case
 	 * when we're inheriting the default ACL. If we dirty it, the inode
 	 * gets marked dirty, but won't (ever) make it onto the dirty list until
@@ -458,11 +524,6 @@ reiserfs_xattr_set(struct inode *inode, 
 		mark_inode_dirty(inode);
 	}
 
-      out_filp:
-	mutex_unlock(&xinode->i_mutex);
-	fput(fp);
-
-      out:
 	return err;
 }
 
@@ -470,7 +531,7 @@ reiserfs_xattr_set(struct inode *inode, 
  * inode->i_mutex: down
  */
 int
-reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer,
+reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
 		   size_t buffer_size)
 {
 	ssize_t err = 0;
@@ -573,13 +634,17 @@ reiserfs_xattr_get(const struct inode *i
 	return err;
 }
 
+/* The following are side effects of other operations that aren't explicitly
+ * modifying extended attributes. This includes operations such as permissions
+ * or ownership changes, object deletions, etc. */
+
 static int
-__reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen)
+reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen,
+			      loff_t offset, u64 ino, unsigned int d_type)
 {
+	struct dentry *xadir = (struct dentry *)buf;
 	struct dentry *dentry;
-	struct inode *dir = xadir->d_inode;
 	int err = 0;
-	struct reiserfs_xattr_handler *xah;
 
 	dentry = lookup_one_len(name, xadir, namelen);
 	if (IS_ERR(dentry)) {
@@ -594,27 +659,6 @@ __reiserfs_xattr_del(struct dentry *xadi
 	if (S_ISDIR(dentry->d_inode->i_mode))
 		goto out_file;
 
-	if (!is_reiserfs_priv_object(dentry->d_inode)) {
-		reiserfs_error(dir->i_sb, "jdm-20003",
-		               "OID %08x [%.*s/%.*s] doesn't have "
-		               "priv flag set [parent is %sset].",
-		               le32_to_cpu(INODE_PKEY(dentry->d_inode)->
-		                           k_objectid), xadir->d_name.len,
-		               xadir->d_name.name, namelen, name,
-		               is_reiserfs_priv_object(xadir-> d_inode) ? "" :
-		               "not ");
-		dput(dentry);
-		return -EIO;
-	}
-
-	/* Deletion pre-operation */
-	xah = find_xattr_handler_prefix(name);
-	if (xah && xah->del) {
-		err = xah->del(inode, name);
-		if (err)
-			goto out;
-	}
-
 	err = vfs_unlink(xadir->d_inode, dentry);
 
       out_file:
@@ -624,45 +668,6 @@ __reiserfs_xattr_del(struct dentry *xadi
 	return err;
 }
 
-int reiserfs_xattr_del(struct inode *inode, const char *name)
-{
-	struct dentry *dir;
-	int err;
-
-	dir = open_xa_dir(inode, XATTR_REPLACE);
-	if (IS_ERR(dir)) {
-		err = PTR_ERR(dir);
-		goto out;
-	}
-
-	mutex_lock(&dir->i_mutex);
-	err = __reiserfs_xattr_del(dir, name, strlen(name));
-	mutex_unlock(&dir->i_mutex);
-	dput(dir);
-
-	if (!err) {
-		inode->i_ctime = CURRENT_TIME_SEC;
-		mark_inode_dirty(inode);
-	}
-
-      out:
-	return err;
-}
-
-/* The following are side effects of other operations that aren't explicitly
- * modifying extended attributes. This includes operations such as permissions
- * or ownership changes, object deletions, etc. */
-
-static int
-reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen,
-			      loff_t offset, u64 ino, unsigned int d_type)
-{
-	struct dentry *xadir = (struct dentry *)buf;
-
-	return __reiserfs_xattr_del(xadir, name, namelen);
-
-}
-
 /* This is called w/ inode->i_mutex downed */
 int reiserfs_delete_xattrs(struct inode *inode)
 {
@@ -817,15 +822,15 @@ ssize_t
 reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
 		  size_t size)
 {
-	struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
-	int err;
+	struct inode *inode = dentry->d_inode;
+	struct xattr_handler *handler;
 
-	if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
-	    get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
+	handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name);
+
+	if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1)
 		return -EOPNOTSUPP;
 
-	err = xah->get(dentry->d_inode, name, buffer, size);
-	return err;
+	return handler->get(inode, name, buffer, size);
 }
 
 /*
@@ -837,15 +842,15 @@ int
 reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 		  size_t size, int flags)
 {
-	struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
-	int err;
+	struct inode *inode = dentry->d_inode;
+	struct xattr_handler *handler;
 
-	if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
-	    get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
+	handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name);
+
+	if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1)
 		return -EOPNOTSUPP;
 
-	err = xah->set(dentry->d_inode, name, value, size, flags);
-	return err;
+	return handler->set(inode, name, value, size, flags);
 }
 
 /*
@@ -855,73 +860,66 @@ reiserfs_setxattr(struct dentry *dentry,
  */
 int reiserfs_removexattr(struct dentry *dentry, const char *name)
 {
-	int err;
-	struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
+	struct inode *inode = dentry->d_inode;
+	struct xattr_handler *handler;
+	handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name);
 
-	if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
-	    get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
+	if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1)
 		return -EOPNOTSUPP;
 
-	err = reiserfs_xattr_del(dentry->d_inode, name);
-
-	dentry->d_inode->i_ctime = CURRENT_TIME_SEC;
-	mark_inode_dirty(dentry->d_inode);
-
-      out:
-	return err;
+	return handler->set(inode, name, NULL, 0, XATTR_REPLACE);
 }
 
-/* This is what filldir will use:
- * r_pos will always contain the amount of space required for the entire
- * list. If r_pos becomes larger than r_size, we need more space and we
- * return an error indicating this. If r_pos is less than r_size, then we've
- * filled the buffer successfully and we return success */
-struct reiserfs_listxattr_buf {
-	int r_pos;
-	int r_size;
-	char *r_buf;
-	struct inode *r_inode;
+struct listxattr_buf {
+	size_t size;
+	size_t pos;
+	char *buf;
+	struct inode *inode;
 };
 
-static int
-reiserfs_listxattr_filler(void *buf, const char *name, int namelen,
-			  loff_t offset, u64 ino, unsigned int d_type)
+static int listxattr_filler(void *buf, const char *name, int namelen,
+                            loff_t offset, u64 ino, unsigned int d_type)
 {
-	struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf;
-	int len = 0;
-	if (name[0] != '.'
-	    || (namelen != 1 && (name[1] != '.' || namelen != 2))) {
-		struct reiserfs_xattr_handler *xah =
-		    find_xattr_handler_prefix(name);
-		if (!xah)
-			return 0;	/* Unsupported xattr name, skip it */
-
-		/* We call ->list() twice because the operation isn't required to just
-		 * return the name back - we want to make sure we have enough space */
-		len += xah->list(b->r_inode, name, namelen, NULL);
-
-		if (len) {
-			if (b->r_pos + len + 1 <= b->r_size) {
-				char *p = b->r_buf + b->r_pos;
-				p += xah->list(b->r_inode, name, namelen, p);
-				*p++ = '\0';
-			}
-			b->r_pos += len + 1;
+	struct listxattr_buf *b = (struct listxattr_buf *)buf;
+	size_t size;
+	if (name[0] != '.' ||
+	    (namelen != 1 && (name[1] != '.' || namelen != 2))) {
+		struct xattr_handler *handler;
+		handler = find_xattr_handler_prefix(b->inode->i_sb->s_xattr,
+		                                    name);
+		if (!handler)	/* Unsupported xattr name */
+			return 0;
+		if (b->buf) {
+			size = handler->list(b->inode, b->buf + b->pos,
+			                 b->size, name, namelen);
+			if (size > b->size)
+				return -ERANGE;
+		} else {
+			size = handler->list(b->inode, NULL, 0, name, namelen);
 		}
-	}
 
+		b->pos += size;
+	}
 	return 0;
 }
 
 /*
  * Inode operation listxattr()
+ *
+ * We totally ignore the generic listxattr here because it would be stupid
+ * not to. Since the xattrs are organized in a directory, we can just
+ * readdir to find them.
  */
 ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
 {
 	struct file *fp;
 	struct dentry *dir;
 	int err = 0;
-	struct reiserfs_listxattr_buf buf;
+	struct listxattr_buf buf = {
+		.inode = dentry->d_inode,
+		.buf = buffer,
+		.size = buffer ? size : 0,
+	};
 
 	if (!dentry->d_inode)
 		return -EINVAL;
@@ -934,30 +932,22 @@ ssize_t reiserfs_listxattr(struct dentry
 	if (IS_ERR(dir)) {
 		err = PTR_ERR(dir);
 		if (err == -ENODATA)
-			err = 0;	/* Not an error if there aren't any xattrs */
+			err = 0;  /* Not an error if there aren't any xattrs */
 		goto out;
 	}
 
-	fp = dentry_open(dir, NULL, O_RDWR);
+	fp = dentry_open(dir, NULL, O_RDWR|O_NOATIME|O_DIRECTORY);
 	if (IS_ERR(fp)) {
 		err = PTR_ERR(fp);
 		/* dentry_open dputs the dentry if it fails */
 		goto out;
 	}
 
-	buf.r_buf = buffer;
-	buf.r_size = buffer ? size : 0;
-	buf.r_pos = 0;
-	buf.r_inode = dentry->d_inode;
-
-	err = xattr_readdir(fp, reiserfs_listxattr_filler, &buf);
+	err = xattr_readdir(fp, listxattr_filler, &buf);
 	if (err)
 		goto out_dir;
 
-	if (buf.r_pos > buf.r_size && buffer != NULL)
-		err = -ERANGE;
-	else
-		err = buf.r_pos;
+	err = buf.pos;
 
       out_dir:
 	fput(fp);
@@ -966,95 +956,6 @@ ssize_t reiserfs_listxattr(struct dentry
 	return err;
 }
 
-/* This is the implementation for the xattr plugin infrastructure */
-static struct list_head xattr_handlers = LIST_HEAD_INIT(xattr_handlers);
-static DEFINE_RWLOCK(handler_lock);
-
-static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
-								*prefix)
-{
-	struct reiserfs_xattr_handler *xah = NULL;
-	struct list_head *p;
-
-	read_lock(&handler_lock);
-	list_for_each(p, &xattr_handlers) {
-		xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
-		if (strncmp(xah->prefix, prefix, strlen(xah->prefix)) == 0)
-			break;
-		xah = NULL;
-	}
-
-	read_unlock(&handler_lock);
-	return xah;
-}
-
-static void __unregister_handlers(void)
-{
-	struct reiserfs_xattr_handler *xah;
-	struct list_head *p, *tmp;
-
-	list_for_each_safe(p, tmp, &xattr_handlers) {
-		xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
-		if (xah->exit)
-			xah->exit();
-
-		list_del_init(p);
-	}
-	INIT_LIST_HEAD(&xattr_handlers);
-}
-
-int __init reiserfs_xattr_register_handlers(void)
-{
-	int err = 0;
-	struct reiserfs_xattr_handler *xah;
-	struct list_head *p;
-
-	write_lock(&handler_lock);
-
-	/* If we're already initialized, nothing to do */
-	if (!list_empty(&xattr_handlers)) {
-		write_unlock(&handler_lock);
-		return 0;
-	}
-
-	/* Add the handlers */
-	list_add_tail(&user_handler.handlers, &xattr_handlers);
-	list_add_tail(&trusted_handler.handlers, &xattr_handlers);
-#ifdef CONFIG_REISERFS_FS_SECURITY
-	list_add_tail(&security_handler.handlers, &xattr_handlers);
-#endif
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-	list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers);
-	list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers);
-#endif
-
-	/* Run initializers, if available */
-	list_for_each(p, &xattr_handlers) {
-		xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
-		if (xah->init) {
-			err = xah->init();
-			if (err) {
-				list_del_init(p);
-				break;
-			}
-		}
-	}
-
-	/* Clean up other handlers, if any failed */
-	if (err)
-		__unregister_handlers();
-
-	write_unlock(&handler_lock);
-	return err;
-}
-
-void reiserfs_xattr_unregister_handlers(void)
-{
-	write_lock(&handler_lock);
-	__unregister_handlers();
-	write_unlock(&handler_lock);
-}
-
 /* This will catch lookups from the fs root to .reiserfs_priv */
 static int
 xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name)
@@ -1083,24 +984,21 @@ int reiserfs_xattr_init(struct super_blo
 
 	/* We need generation numbers to ensure that the oid mapping is correct
 	 * v3.5 filesystems don't have them. */
-	if (!old_format_only(s)) {
-		set_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
-	} else if (reiserfs_xattrs_optional(s)) {
-		/* Old format filesystem, but optional xattrs have been enabled
-		 * at mount time. Error out. */
-		reiserfs_warning(s, "jdm-20005",
-		                 "xattrs/ACLs not supported on pre v3.6 "
-				 "format filesystem. Failing mount.");
-		err = -EOPNOTSUPP;
-		goto error;
-	} else {
-		/* Old format filesystem, but no optional xattrs have been enabled. This
-		 * means we silently disable xattrs on the filesystem. */
-		clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
+	if (old_format_only(s)) {
+		if (reiserfs_xattrs_optional(s)) {
+			/* Old format filesystem, but optional xattrs have
+			 * been enabled. Error out. */
+			reiserfs_warning(s, "jdm-2005",
+			                 "xattrs/ACLs not supported "
+			                 "on pre-v3.6 format filesystems. "
+			                 "Failing mount.");
+			err = -EOPNOTSUPP;
+		}
+		return err;
 	}
 
 	/* If we don't have the privroot located yet - go find it */
-	if (reiserfs_xattrs(s) && !REISERFS_SB(s)->priv_root) {
+	if (!REISERFS_SB(s)->priv_root) {
 		struct dentry *dentry;
 		dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
 					strlen(PRIVROOT_NAME));
@@ -1141,14 +1039,17 @@ int reiserfs_xattr_init(struct super_blo
 					 "find/create .reiserfs_priv. "
 					 "Failing mount.");
 			err = -EOPNOTSUPP;
+			goto error;
 		}
 	}
 
+	if (!err)
+		s->s_xattr = reiserfs_xattr_handlers;
+
       error:
 	/* This is only nonzero if there was an error initializing the xattr
 	 * directory or if there is a condition where we don't support them. */
 	if (err) {
-		clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
 		clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
 		clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
 	}
--- a/fs/reiserfs/xattr_acl.c	2007-06-11 14:49:36.000000000 -0400
+++ b/fs/reiserfs/xattr_acl.c	2007-06-11 14:50:06.000000000 -0400
@@ -271,7 +271,7 @@ reiserfs_set_acl(struct inode *inode, in
 	char *name;
 	void *value = NULL;
 	struct posix_acl **p_acl;
-	size_t size;
+	size_t size = 0;
 	int error;
 	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
 
@@ -289,6 +289,9 @@ reiserfs_set_acl(struct inode *inode, in
 				return error;
 			else {
 				inode->i_mode = mode;
+				/* We don't dirty the inode, since
+				 * reiserfs_xattr_set_handle will do it
+				 * for us. */
 				if (error == 0)
 					acl = NULL;
 			}
@@ -308,19 +311,10 @@ reiserfs_set_acl(struct inode *inode, in
 		value = posix_acl_to_disk(acl, &size);
 		if (IS_ERR(value))
 			return (int)PTR_ERR(value);
-		error = reiserfs_xattr_set(inode, name, value, size, 0);
-	} else {
-		error = reiserfs_xattr_del(inode, name);
-		if (error == -ENODATA) {
-			/* This may seem odd here, but it means that the ACL was set
-			 * with a value representable with mode bits. If there was
-			 * an ACL before, reiserfs_xattr_del already dirtied the inode.
-			 */
-			mark_inode_dirty(inode);
-			error = 0;
-		}
 	}
 
+	error = reiserfs_xattr_set(inode, name, value, size, 0);
+
 	kfree(value);
 
 	if (!error)
@@ -474,33 +468,22 @@ posix_acl_access_set(struct inode *inode
 	return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
 }
 
-static int posix_acl_access_del(struct inode *inode, const char *name)
-{
-	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
-	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
-		return -EINVAL;
-	iset_acl(inode, &reiserfs_i->i_acl_access, ERR_PTR(-ENODATA));
-	return 0;
-}
-
-static int
-posix_acl_access_list(struct inode *inode, const char *name, int namelen,
-		      char *out)
+static size_t posix_acl_access_list(struct inode *inode, char *list,
+                                    size_t list_size, const char *name,
+                                    size_t name_len)
 {
-	int len = namelen;
+	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
 	if (!reiserfs_posixacl(inode->i_sb))
 		return 0;
-	if (out)
-		memcpy(out, name, len);
-
-	return len;
+	if (list && size <= list_size)
+	 	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
+	return size;
 }
 
-struct reiserfs_xattr_handler posix_acl_access_handler = {
+struct xattr_handler reiserfs_posix_acl_access_handler = {
 	.prefix = POSIX_ACL_XATTR_ACCESS,
 	.get = posix_acl_access_get,
 	.set = posix_acl_access_set,
-	.del = posix_acl_access_del,
 	.list = posix_acl_access_list,
 };
 
@@ -522,32 +505,21 @@ posix_acl_default_set(struct inode *inod
 	return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
 }
 
-static int posix_acl_default_del(struct inode *inode, const char *name)
+static size_t posix_acl_default_list(struct inode *inode, char *list,
+                                     size_t list_size, const char *name,
+                                     size_t name_len)
 {
-	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
-	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
-		return -EINVAL;
-	iset_acl(inode, &reiserfs_i->i_acl_default, ERR_PTR(-ENODATA));
-	return 0;
-}
-
-static int
-posix_acl_default_list(struct inode *inode, const char *name, int namelen,
-		       char *out)
-{
-	int len = namelen;
+	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
 	if (!reiserfs_posixacl(inode->i_sb))
 		return 0;
-	if (out)
-		memcpy(out, name, len);
-
-	return len;
+	if (list && size <= list_size)
+	 	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
+	return size;
 }
 
-struct reiserfs_xattr_handler posix_acl_default_handler = {
+struct xattr_handler reiserfs_posix_acl_default_handler = {
 	.prefix = POSIX_ACL_XATTR_DEFAULT,
 	.get = posix_acl_default_get,
 	.set = posix_acl_default_set,
-	.del = posix_acl_default_del,
 	.list = posix_acl_default_list,
 };
--- a/fs/reiserfs/xattr_security.c	2007-06-11 14:49:05.000000000 -0400
+++ b/fs/reiserfs/xattr_security.c	2007-06-11 14:50:05.000000000 -0400
@@ -33,35 +33,25 @@ security_set(struct inode *inode, const 
 	return reiserfs_xattr_set(inode, name, buffer, size, flags);
 }
 
-static int security_del(struct inode *inode, const char *name)
+static size_t security_list(struct inode *inode, char *list, size_t list_len,
+			    const char *name, size_t namelen)
 {
-	if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
-		return -EINVAL;
-
-	if (is_reiserfs_priv_object(inode))
-		return -EPERM;
-
-	return 0;
-}
-
-static int
-security_list(struct inode *inode, const char *name, int namelen, char *out)
-{
-	int len = namelen;
+	const size_t len = namelen + 1;
 
 	if (is_reiserfs_priv_object(inode))
 		return 0;
 
-	if (out)
-		memcpy(out, name, len);
+	if (list && len <= list_len) {
+		memcpy(list, name, namelen);
+		list[namelen] = '\0';
+	}
 
 	return len;
 }
 
-struct reiserfs_xattr_handler security_handler = {
+struct xattr_handler reiserfs_xattr_security_handler = {
 	.prefix = XATTR_SECURITY_PREFIX,
 	.get = security_get,
 	.set = security_set,
-	.del = security_del,
 	.list = security_list,
 };
--- a/fs/reiserfs/xattr_trusted.c	2007-06-11 14:49:05.000000000 -0400
+++ b/fs/reiserfs/xattr_trusted.c	2007-06-11 14:49:37.000000000 -0400
@@ -15,10 +15,7 @@ trusted_get(struct inode *inode, const c
 	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
 		return -EINVAL;
 
-	if (!reiserfs_xattrs(inode->i_sb))
-		return -EOPNOTSUPP;
-
-	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
+	if (!capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode))
 		return -EPERM;
 
 	return reiserfs_xattr_get(inode, name, buffer, size);
@@ -31,50 +28,30 @@ trusted_set(struct inode *inode, const c
 	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
 		return -EINVAL;
 
-	if (!reiserfs_xattrs(inode->i_sb))
-		return -EOPNOTSUPP;
-
-	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
+	if (!capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode))
 		return -EPERM;
 
 	return reiserfs_xattr_set(inode, name, buffer, size, flags);
 }
 
-static int trusted_del(struct inode *inode, const char *name)
+static size_t trusted_list(struct inode *inode, char *list, size_t list_size,
+                           const char *name, size_t name_len)
 {
-	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
-		return -EINVAL;
+	const size_t len = name_len + 1;
 
-	if (!reiserfs_xattrs(inode->i_sb))
-		return -EOPNOTSUPP;
-
-	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
-		return -EPERM;
-
-	return 0;
-}
-
-static int
-trusted_list(struct inode *inode, const char *name, int namelen, char *out)
-{
-	int len = namelen;
-
-	if (!reiserfs_xattrs(inode->i_sb))
+	if (!capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode))
 		return 0;
 
-	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
-		return 0;
-
-	if (out)
-		memcpy(out, name, len);
-
+	if (list && len <= list_size) {
+		memcpy(list, name, name_len);
+		list[name_len] = '\0';
+	}
 	return len;
 }
 
-struct reiserfs_xattr_handler trusted_handler = {
+struct xattr_handler reiserfs_xattr_trusted_handler = {
 	.prefix = XATTR_TRUSTED_PREFIX,
 	.get = trusted_get,
 	.set = trusted_set,
-	.del = trusted_del,
 	.list = trusted_list,
 };
--- a/fs/reiserfs/xattr_user.c	2007-06-11 14:49:05.000000000 -0400
+++ b/fs/reiserfs/xattr_user.c	2007-06-11 14:49:37.000000000 -0400
@@ -6,10 +6,6 @@
 #include <linux/reiserfs_xattr.h>
 #include <asm/uaccess.h>
 
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-# include <linux/reiserfs_acl.h>
-#endif
-
 #define XATTR_USER_PREFIX "user."
 
 static int
@@ -36,33 +32,23 @@ user_set(struct inode *inode, const char
 	return reiserfs_xattr_set(inode, name, buffer, size, flags);
 }
 
-static int user_del(struct inode *inode, const char *name)
+static size_t user_list(struct inode *inode, char *list, size_t list_size,
+                        const char *name, size_t name_len)
 {
-	if (strlen(name) < sizeof(XATTR_USER_PREFIX))
-		return -EINVAL;
+	const size_t len = name_len + 1;
 
 	if (!reiserfs_xattrs_user(inode->i_sb))
-		return -EOPNOTSUPP;
-	return 0;
-}
-
-static int
-user_list(struct inode *inode, const char *name, int namelen, char *out)
-{
-	int len = namelen;
-	if (!reiserfs_xattrs_user(inode->i_sb))
 		return 0;
-
-	if (out)
-		memcpy(out, name, len);
-
+	if (list && len <= list_size) {
+		memcpy(list, name, name_len);
+		list[name_len] = '\0';
+	}
 	return len;
 }
 
-struct reiserfs_xattr_handler user_handler = {
+struct xattr_handler reiserfs_xattr_user_handler = {
 	.prefix = XATTR_USER_PREFIX,
 	.get = user_get,
 	.set = user_set,
-	.del = user_del,
 	.list = user_list,
 };
--- a/include/linux/reiserfs_acl.h	2007-06-11 14:49:05.000000000 -0400
+++ b/include/linux/reiserfs_acl.h	2007-06-11 14:50:06.000000000 -0400
@@ -52,10 +52,8 @@ int reiserfs_acl_chmod(struct inode *ino
 int reiserfs_inherit_default_acl(struct inode *dir, struct dentry *dentry,
 				 struct inode *inode);
 int reiserfs_cache_default_acl(struct inode *dir);
-extern int reiserfs_xattr_posix_acl_init(void) __init;
-extern int reiserfs_xattr_posix_acl_exit(void);
-extern struct reiserfs_xattr_handler posix_acl_default_handler;
-extern struct reiserfs_xattr_handler posix_acl_access_handler;
+extern struct xattr_handler reiserfs_posix_acl_default_handler;
+extern struct xattr_handler reiserfs_posix_acl_access_handler;
 
 static inline void reiserfs_init_acl_access(struct inode *inode)
 {
@@ -75,16 +73,6 @@ static inline struct posix_acl *reiserfs
 	return NULL;
 }
 
-static inline int reiserfs_xattr_posix_acl_init(void)
-{
-	return 0;
-}
-
-static inline int reiserfs_xattr_posix_acl_exit(void)
-{
-	return 0;
-}
-
 static inline int reiserfs_acl_chmod(struct inode *inode)
 {
 	return 0;
--- a/include/linux/reiserfs_fs_sb.h	2007-06-11 14:49:36.000000000 -0400
+++ b/include/linux/reiserfs_fs_sb.h	2007-06-11 14:50:04.000000000 -0400
@@ -452,7 +452,6 @@ enum reiserfs_mount_options {
 	REISERFS_NO_UNHASHED_RELOCATION,
 	REISERFS_HASHED_RELOCATION,
 	REISERFS_ATTRS,
-	REISERFS_XATTRS,
 	REISERFS_XATTRS_USER,
 	REISERFS_POSIXACL,
 	REISERFS_BARRIER_NONE,
@@ -490,7 +489,7 @@ enum reiserfs_mount_options {
 #define reiserfs_data_log(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_LOG))
 #define reiserfs_data_ordered(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_ORDERED))
 #define reiserfs_data_writeback(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_WRITEBACK))
-#define reiserfs_xattrs(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS))
+#define reiserfs_xattrs(s) ((s)->s_xattr != NULL)
 #define reiserfs_xattrs_user(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS_USER))
 #define reiserfs_posixacl(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_POSIXACL))
 #define reiserfs_xattrs_optional(s) (reiserfs_xattrs_user(s) || reiserfs_posixacl(s))
--- a/include/linux/reiserfs_xattr.h	2007-06-11 14:49:36.000000000 -0400
+++ b/include/linux/reiserfs_xattr.h	2007-06-11 14:50:06.000000000 -0400
@@ -29,20 +29,6 @@ struct iattr;
 struct super_block;
 struct nameidata;
 
-struct reiserfs_xattr_handler {
-	char *prefix;
-	int (*init) (void);
-	void (*exit) (void);
-	int (*get) (struct inode * inode, const char *name, void *buffer,
-		    size_t size);
-	int (*set) (struct inode * inode, const char *name, const void *buffer,
-		    size_t size, int flags);
-	int (*del) (struct inode * inode, const char *name);
-	int (*list) (struct inode * inode, const char *name, int namelen,
-		     char *out);
-	struct list_head handlers;
-};
-
 #ifdef CONFIG_REISERFS_FS_XATTR
 #define is_reiserfs_priv_object(inode) IS_PRIVATE(inode)
 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
@@ -57,16 +43,12 @@ int reiserfs_chown_xattrs(struct inode *
 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
 int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd);
 
-int reiserfs_xattr_del(struct inode *, const char *);
-int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
+int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
 
-extern struct reiserfs_xattr_handler user_handler;
-extern struct reiserfs_xattr_handler trusted_handler;
-extern struct reiserfs_xattr_handler security_handler;
-
-int reiserfs_xattr_register_handlers(void) __init;
-void reiserfs_xattr_unregister_handlers(void);
+extern struct xattr_handler reiserfs_xattr_user_handler;
+extern struct xattr_handler reiserfs_xattr_trusted_handler;
+extern struct xattr_handler reiserfs_xattr_security_handler;
 
 
 static inline void reiserfs_mark_inode_private(struct inode *inode)
@@ -85,9 +67,6 @@ static inline void reiserfs_mark_inode_p
 
 #define reiserfs_permission NULL
 
-#define reiserfs_xattr_register_handlers() 0
-#define reiserfs_xattr_unregister_handlers()
-
 static inline int reiserfs_delete_xattrs(struct inode *inode)
 {
 	return 0;

-- 
Jeff Mahoney
SUSE Labs