hfsplus: rework functionality of getting, setting and deleting of extended attributes

Rework functionality of getting, setting and deleting of extended attributes.
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/hfsplus/xattr.c

+/*
+ * linux/fs/hfsplus/xattr.c
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Logic of processing extended attributes
+ */
+
+#include "hfsplus_fs.h"
+#include "xattr.h"
+
+const struct xattr_handler *hfsplus_xattr_handlers[] = {
+	&hfsplus_xattr_osx_handler,
+	&hfsplus_xattr_user_handler,
+	&hfsplus_xattr_trusted_handler,
+	&hfsplus_xattr_security_handler,
+	NULL
+};
+
+static int strcmp_xattr_finder_info(const char *name)
+{
+	if (name) {
+		return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
+				sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
+	}
+	return -1;
+}
+
+static int strcmp_xattr_acl(const char *name)
+{
+	if (name) {
+		return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
+				sizeof(HFSPLUS_XATTR_ACL_NAME));
+	}
+	return -1;
+}
+
+static inline int is_known_namespace(const char *name)
+{
+	if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
+	    strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
+	    strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
+	    strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
+		return false;
+
+	return true;
+}
+
+static int can_set_xattr(struct inode *inode, const char *name,
+				const void *value, size_t value_len)
+{
+	if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+		return -EOPNOTSUPP; /* TODO: implement ACL support */
+
+	if (!strncmp(name, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN)) {
+		/*
+		 * This makes sure that we aren't trying to set an
+		 * attribute in a different namespace by prefixing it
+		 * with "osx."
+		 */
+		if (is_known_namespace(name + XATTR_MAC_OSX_PREFIX_LEN))
+			return -EOPNOTSUPP;
+
+		return 0;
+	}
+
+	/*
+	 * Don't allow setting an attribute in an unknown namespace.
+	 */
+	if (strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) &&
+	    strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
+	    strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+int __hfsplus_setxattr(struct inode *inode, const char *name,
+			const void *value, size_t size, int flags)
+{
+	int err = 0;
+	struct hfs_find_data cat_fd;
+	hfsplus_cat_entry entry;
+	u16 cat_entry_flags, cat_entry_type;
+	u16 folder_finderinfo_len = sizeof(struct DInfo) +
+					sizeof(struct DXInfo);
+	u16 file_finderinfo_len = sizeof(struct FInfo) +
+					sizeof(struct FXInfo);
+
+	if ((!S_ISREG(inode->i_mode) &&
+			!S_ISDIR(inode->i_mode)) ||
+				HFSPLUS_IS_RSRC(inode))
+		return -EOPNOTSUPP;
+
+	err = can_set_xattr(inode, name, value, size);
+	if (err)
+		return err;
+
+	if (strncmp(name, XATTR_MAC_OSX_PREFIX,
+				XATTR_MAC_OSX_PREFIX_LEN) == 0)
+		name += XATTR_MAC_OSX_PREFIX_LEN;
+
+	if (value == NULL) {
+		value = "";
+		size = 0;
+	}
+
+	err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
+	if (err) {
+		printk(KERN_ERR "hfs: can't init xattr find struct\n");
+		return err;
+	}
+
+	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
+	if (err) {
+		printk(KERN_ERR "hfs: catalog searching failed\n");
+		goto end_setxattr;
+	}
+
+	if (!strcmp_xattr_finder_info(name)) {
+		if (flags & XATTR_CREATE) {
+			printk(KERN_ERR "hfs: xattr exists yet\n");
+			err = -EOPNOTSUPP;
+			goto end_setxattr;
+		}
+		hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
+					sizeof(hfsplus_cat_entry));
+		if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
+			if (size == folder_finderinfo_len) {
+				memcpy(&entry.folder.user_info, value,
+						folder_finderinfo_len);
+				hfs_bnode_write(cat_fd.bnode, &entry,
+					cat_fd.entryoffset,
+					sizeof(struct hfsplus_cat_folder));
+				hfsplus_mark_inode_dirty(inode,
+						HFSPLUS_I_CAT_DIRTY);
+			} else {
+				err = -ERANGE;
+				goto end_setxattr;
+			}
+		} else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
+			if (size == file_finderinfo_len) {
+				memcpy(&entry.file.user_info, value,
+						file_finderinfo_len);
+				hfs_bnode_write(cat_fd.bnode, &entry,
+					cat_fd.entryoffset,
+					sizeof(struct hfsplus_cat_file));
+				hfsplus_mark_inode_dirty(inode,
+						HFSPLUS_I_CAT_DIRTY);
+			} else {
+				err = -ERANGE;
+				goto end_setxattr;
+			}
+		} else {
+			err = -EOPNOTSUPP;
+			goto end_setxattr;
+		}
+		goto end_setxattr;
+	}
+
+	if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
+		err = -EOPNOTSUPP;
+		goto end_setxattr;
+	}
+
+	if (hfsplus_attr_exists(inode, name)) {
+		if (flags & XATTR_CREATE) {
+			printk(KERN_ERR "hfs: xattr exists yet\n");
+			err = -EOPNOTSUPP;
+			goto end_setxattr;
+		}
+		err = hfsplus_delete_attr(inode, name);
+		if (err)
+			goto end_setxattr;
+		err = hfsplus_create_attr(inode, name, value, size);
+		if (err)
+			goto end_setxattr;
+	} else {
+		if (flags & XATTR_REPLACE) {
+			printk(KERN_ERR "hfs: cannot replace xattr\n");
+			err = -EOPNOTSUPP;
+			goto end_setxattr;
+		}
+		err = hfsplus_create_attr(inode, name, value, size);
+		if (err)
+			goto end_setxattr;
+	}
+
+	cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
+	if (cat_entry_type == HFSPLUS_FOLDER) {
+		cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
+				    cat_fd.entryoffset +
+				    offsetof(struct hfsplus_cat_folder, flags));
+		cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
+		if (!strcmp_xattr_acl(name))
+			cat_entry_flags |= HFSPLUS_ACL_EXISTS;
+		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
+				offsetof(struct hfsplus_cat_folder, flags),
+				cat_entry_flags);
+		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
+	} else if (cat_entry_type == HFSPLUS_FILE) {
+		cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
+				    cat_fd.entryoffset +
+				    offsetof(struct hfsplus_cat_file, flags));
+		cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
+		if (!strcmp_xattr_acl(name))
+			cat_entry_flags |= HFSPLUS_ACL_EXISTS;
+		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
+				    offsetof(struct hfsplus_cat_file, flags),
+				    cat_entry_flags);
+		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
+	} else {
+		printk(KERN_ERR "hfs: invalid catalog entry type\n");
+		err = -EIO;
+		goto end_setxattr;
+	}
+
+end_setxattr:
+	hfs_find_exit(&cat_fd);
+	return err;
+}
+
+static inline int is_osx_xattr(const char *xattr_name)
+{
+	return !is_known_namespace(xattr_name);
+}
+
+static int name_len(const char *xattr_name, int xattr_name_len)
+{
+	int len = xattr_name_len + 1;
+
+	if (is_osx_xattr(xattr_name))
+		len += XATTR_MAC_OSX_PREFIX_LEN;
+
+	return len;
+}
+
+static int copy_name(char *buffer, const char *xattr_name, int name_len)
+{
+	int len = name_len;
+	int offset = 0;
+
+	if (is_osx_xattr(xattr_name)) {
+		strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN);
+		offset += XATTR_MAC_OSX_PREFIX_LEN;
+		len += XATTR_MAC_OSX_PREFIX_LEN;
+	}
+
+	strncpy(buffer + offset, xattr_name, name_len);
+	memset(buffer + offset + name_len, 0, 1);
+	len += 1;
+
+	return len;
+}
+
+static ssize_t hfsplus_getxattr_finder_info(struct dentry *dentry,
+						void *value, size_t size)
+{
+	ssize_t res = 0;
+	struct inode *inode = dentry->d_inode;
+	struct hfs_find_data fd;
+	u16 entry_type;
+	u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
+	u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
+	u16 record_len = max(folder_rec_len, file_rec_len);
+	u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
+	u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
+
+	if (size >= record_len) {
+		res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
+		if (res) {
+			printk(KERN_ERR "hfs: can't init xattr find struct\n");
+			return res;
+		}
+		res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+		if (res)
+			goto end_getxattr_finder_info;
+		entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
+
+		if (entry_type == HFSPLUS_FOLDER) {
+			hfs_bnode_read(fd.bnode, folder_finder_info,
+				fd.entryoffset +
+				offsetof(struct hfsplus_cat_folder, user_info),
+				folder_rec_len);
+			memcpy(value, folder_finder_info, folder_rec_len);
+			res = folder_rec_len;
+		} else if (entry_type == HFSPLUS_FILE) {
+			hfs_bnode_read(fd.bnode, file_finder_info,
+				fd.entryoffset +
+				offsetof(struct hfsplus_cat_file, user_info),
+				file_rec_len);
+			memcpy(value, file_finder_info, file_rec_len);
+			res = file_rec_len;
+		} else {
+			res = -EOPNOTSUPP;
+			goto end_getxattr_finder_info;
+		}
+	} else
+		res = size ? -ERANGE : record_len;
+
+end_getxattr_finder_info:
+	if (size >= record_len)
+		hfs_find_exit(&fd);
+	return res;
+}
+
+ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
+			 void *value, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	struct hfs_find_data fd;
+	hfsplus_attr_entry *entry;
+	__be32 xattr_record_type;
+	u32 record_type;
+	u16 record_length = 0;
+	ssize_t res = 0;
+
+	if ((!S_ISREG(inode->i_mode) &&
+			!S_ISDIR(inode->i_mode)) ||
+				HFSPLUS_IS_RSRC(inode))
+		return -EOPNOTSUPP;
+
+	if (strncmp(name, XATTR_MAC_OSX_PREFIX,
+				XATTR_MAC_OSX_PREFIX_LEN) == 0) {
+		/* skip "osx." prefix */
+		name += XATTR_MAC_OSX_PREFIX_LEN;
+		/*
+		 * Don't allow retrieving properly prefixed attributes
+		 * by prepending them with "osx."
+		 */
+		if (is_known_namespace(name))
+			return -EOPNOTSUPP;
+	}
+
+	if (!strcmp_xattr_finder_info(name))
+		return hfsplus_getxattr_finder_info(dentry, value, size);
+
+	if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
+		return -EOPNOTSUPP;
+
+	entry = hfsplus_alloc_attr_entry();
+	if (!entry) {
+		printk(KERN_ERR "hfs: can't allocate xattr entry\n");
+		return -ENOMEM;
+	}
+
+	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
+	if (res) {
+		printk(KERN_ERR "hfs: can't init xattr find struct\n");
+		goto failed_getxattr_init;
+	}
+
+	res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
+	if (res) {
+		if (res == -ENOENT)
+			res = -ENODATA;
+		else
+			printk(KERN_ERR "hfs: xattr searching failed\n");
+		goto out;
+	}
+
+	hfs_bnode_read(fd.bnode, &xattr_record_type,
+			fd.entryoffset, sizeof(xattr_record_type));
+	record_type = be32_to_cpu(xattr_record_type);
+	if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
+		record_length = hfs_bnode_read_u16(fd.bnode,
+				fd.entryoffset +
+				offsetof(struct hfsplus_attr_inline_data,
+				length));
+		if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
+			printk(KERN_ERR "hfs: invalid xattr record size\n");
+			res = -EIO;
+			goto out;
+		}
+	} else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
+			record_type == HFSPLUS_ATTR_EXTENTS) {
+		printk(KERN_ERR "hfs: only inline data xattr are supported\n");
+		res = -EOPNOTSUPP;
+		goto out;
+	} else {
+		printk(KERN_ERR "hfs: invalid xattr record\n");
+		res = -EIO;
+		goto out;
+	}
+
+	if (size) {
+		hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
+				offsetof(struct hfsplus_attr_inline_data,
+					raw_bytes) + record_length);
+	}
+
+	if (size >= record_length) {
+		memcpy(value, entry->inline_data.raw_bytes, record_length);
+		res = record_length;
+	} else
+		res = size ? -ERANGE : record_length;
+
+out:
+	hfs_find_exit(&fd);
+
+failed_getxattr_init:
+	hfsplus_destroy_attr_entry(entry);
+	return res;
+}
+
+static inline int can_list(const char *xattr_name)
+{
+	if (!xattr_name)
+		return 0;
+
+	return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
+			XATTR_TRUSTED_PREFIX_LEN) ||
+				capable(CAP_SYS_ADMIN);
+}
+
+static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
+						char *buffer, size_t size)
+{
+	ssize_t res = 0;
+	struct inode *inode = dentry->d_inode;
+	struct hfs_find_data fd;
+	u16 entry_type;
+	u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
+	u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
+	unsigned long len, found_bit;
+	int xattr_name_len, symbols_count;
+
+	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
+	if (res) {
+		printk(KERN_ERR "hfs: can't init xattr find struct\n");
+		return res;
+	}
+
+	res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+	if (res)
+		goto end_listxattr_finder_info;
+
+	entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
+	if (entry_type == HFSPLUS_FOLDER) {
+		len = sizeof(struct DInfo) + sizeof(struct DXInfo);
+		hfs_bnode_read(fd.bnode, folder_finder_info,
+				fd.entryoffset +
+				offsetof(struct hfsplus_cat_folder, user_info),
+				len);
+		found_bit = find_first_bit((void *)folder_finder_info, len*8);
+	} else if (entry_type == HFSPLUS_FILE) {
+		len = sizeof(struct FInfo) + sizeof(struct FXInfo);
+		hfs_bnode_read(fd.bnode, file_finder_info,
+				fd.entryoffset +
+				offsetof(struct hfsplus_cat_file, user_info),
+				len);
+		found_bit = find_first_bit((void *)file_finder_info, len*8);
+	} else {
+		res = -EOPNOTSUPP;
+		goto end_listxattr_finder_info;
+	}
+
+	if (found_bit >= (len*8))
+		res = 0;
+	else {
+		symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
+		xattr_name_len =
+			name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
+		if (!buffer || !size) {
+			if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
+				res = xattr_name_len;
+		} else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
+			if (size < xattr_name_len)
+				res = -ERANGE;
+			else {
+				res = copy_name(buffer,
+						HFSPLUS_XATTR_FINDER_INFO_NAME,
+						symbols_count);
+			}
+		}
+	}
+
+end_listxattr_finder_info:
+	hfs_find_exit(&fd);
+
+	return res;
+}
+
+ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+	ssize_t err;
+	ssize_t res = 0;
+	struct inode *inode = dentry->d_inode;
+	struct hfs_find_data fd;
+	u16 key_len = 0;
+	struct hfsplus_attr_key attr_key;
+	char strbuf[HFSPLUS_ATTR_MAX_STRLEN +
+			XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
+	int xattr_name_len;
+
+	if ((!S_ISREG(inode->i_mode) &&
+			!S_ISDIR(inode->i_mode)) ||
+				HFSPLUS_IS_RSRC(inode))
+		return -EOPNOTSUPP;
+
+	res = hfsplus_listxattr_finder_info(dentry, buffer, size);
+	if (res < 0)
+		return res;
+	else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
+		return (res == 0) ? -EOPNOTSUPP : res;
+
+	err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
+	if (err) {
+		printk(KERN_ERR "hfs: can't init xattr find struct\n");
+		return err;
+	}
+
+	err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
+	if (err) {
+		if (err == -ENOENT) {
+			if (res == 0)
+				res = -ENODATA;
+			goto end_listxattr;
+		} else {
+			res = err;
+			goto end_listxattr;
+		}
+	}
+
+	for (;;) {
+		key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
+		if (key_len == 0 || key_len > fd.tree->max_key_len) {
+			printk(KERN_ERR "hfs: invalid xattr key length: %d\n",
+							key_len);
+			res = -EIO;
+			goto end_listxattr;
+		}
+
+		hfs_bnode_read(fd.bnode, &attr_key,
+				fd.keyoffset, key_len + sizeof(key_len));
+
+		if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
+			goto end_listxattr;
+
+		xattr_name_len = HFSPLUS_ATTR_MAX_STRLEN;
+		if (hfsplus_uni2asc(inode->i_sb,
+			(const struct hfsplus_unistr *)&fd.key->attr.key_name,
+					strbuf, &xattr_name_len)) {
+			printk(KERN_ERR "hfs: unicode conversion failed\n");
+			res = -EIO;
+			goto end_listxattr;
+		}
+
+		if (!buffer || !size) {
+			if (can_list(strbuf))
+				res += name_len(strbuf, xattr_name_len);
+		} else if (can_list(strbuf)) {
+			if (size < (res + name_len(strbuf, xattr_name_len))) {
+				res = -ERANGE;
+				goto end_listxattr;
+			} else
+				res += copy_name(buffer + res,
+						strbuf, xattr_name_len);
+		}
+
+		if (hfs_brec_goto(&fd, 1))
+			goto end_listxattr;
+	}
+
+end_listxattr:
+	hfs_find_exit(&fd);
+	return res;
+}
+
+int hfsplus_removexattr(struct dentry *dentry, const char *name)
+{
+	int err = 0;
+	struct inode *inode = dentry->d_inode;
+	struct hfs_find_data cat_fd;
+	u16 flags;
+	u16 cat_entry_type;
+	int is_xattr_acl_deleted = 0;
+	int is_all_xattrs_deleted = 0;
+
+	if ((!S_ISREG(inode->i_mode) &&
+			!S_ISDIR(inode->i_mode)) ||
+				HFSPLUS_IS_RSRC(inode))
+		return -EOPNOTSUPP;
+
+	if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
+		return -EOPNOTSUPP;
+
+	err = can_set_xattr(inode, name, NULL, 0);
+	if (err)
+		return err;
+
+	if (strncmp(name, XATTR_MAC_OSX_PREFIX,
+				XATTR_MAC_OSX_PREFIX_LEN) == 0)
+		name += XATTR_MAC_OSX_PREFIX_LEN;
+
+	if (!strcmp_xattr_finder_info(name))
+		return -EOPNOTSUPP;
+
+	err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
+	if (err) {
+		printk(KERN_ERR "hfs: can't init xattr find struct\n");
+		return err;
+	}
+
+	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
+	if (err) {
+		printk(KERN_ERR "hfs: catalog searching failed\n");
+		goto end_removexattr;
+	}
+
+	err = hfsplus_delete_attr(inode, name);
+	if (err)
+		goto end_removexattr;
+
+	is_xattr_acl_deleted = !strcmp_xattr_acl(name);
+	is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);
+
+	if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
+		goto end_removexattr;
+
+	cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
+
+	if (cat_entry_type == HFSPLUS_FOLDER) {
+		flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
+				offsetof(struct hfsplus_cat_folder, flags));
+		if (is_xattr_acl_deleted)
+			flags &= ~HFSPLUS_ACL_EXISTS;
+		if (is_all_xattrs_deleted)
+			flags &= ~HFSPLUS_XATTR_EXISTS;
+		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
+				offsetof(struct hfsplus_cat_folder, flags),
+				flags);
+		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
+	} else if (cat_entry_type == HFSPLUS_FILE) {
+		flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
+				offsetof(struct hfsplus_cat_file, flags));
+		if (is_xattr_acl_deleted)
+			flags &= ~HFSPLUS_ACL_EXISTS;
+		if (is_all_xattrs_deleted)
+			flags &= ~HFSPLUS_XATTR_EXISTS;
+		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
+				offsetof(struct hfsplus_cat_file, flags),
+				flags);
+		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
+	} else {
+		printk(KERN_ERR "hfs: invalid catalog entry type\n");
+		err = -EIO;
+		goto end_removexattr;
+	}
+
+end_removexattr:
+	hfs_find_exit(&cat_fd);
+	return err;
+}
+
+static int hfsplus_osx_getxattr(struct dentry *dentry, const char *name,
+					void *buffer, size_t size, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
+				XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
+	strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);
+
+	return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+}
+
+static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name,
+		const void *buffer, size_t size, int flags, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
+				XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
+	strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);
+
+	return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+}
+
+static size_t hfsplus_osx_listxattr(struct dentry *dentry, char *list,
+		size_t list_size, const char *name, size_t name_len, int type)
+{
+	/*
+	 * This method is not used.
+	 * It is used hfsplus_listxattr() instead of generic_listxattr().
+	 */
+	return -EOPNOTSUPP;
+}
+
+const struct xattr_handler hfsplus_xattr_osx_handler = {
+	.prefix	= XATTR_MAC_OSX_PREFIX,
+	.list	= hfsplus_osx_listxattr,
+	.get	= hfsplus_osx_getxattr,
+	.set	= hfsplus_osx_setxattr,
+};

fs/hfsplus/xattr.h

+/*
+ * linux/fs/hfsplus/xattr.h
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Logic of processing extended attributes
+ */
+
+#ifndef _LINUX_HFSPLUS_XATTR_H
+#define _LINUX_HFSPLUS_XATTR_H
+
+#include <linux/xattr.h>
+
+extern const struct xattr_handler hfsplus_xattr_osx_handler;
+extern const struct xattr_handler hfsplus_xattr_user_handler;
+extern const struct xattr_handler hfsplus_xattr_trusted_handler;
+/*extern const struct xattr_handler hfsplus_xattr_acl_access_handler;*/
+/*extern const struct xattr_handler hfsplus_xattr_acl_default_handler;*/
+extern const struct xattr_handler hfsplus_xattr_security_handler;
+
+extern const struct xattr_handler *hfsplus_xattr_handlers[];
+
+int __hfsplus_setxattr(struct inode *inode, const char *name,
+			const void *value, size_t size, int flags);
+
+static inline int hfsplus_setxattr(struct dentry *dentry, const char *name,
+			const void *value, size_t size, int flags)
+{
+	return __hfsplus_setxattr(dentry->d_inode, name, value, size, flags);
+}
+
+ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
+			void *value, size_t size);
+
+ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size);
+
+int hfsplus_removexattr(struct dentry *dentry, const char *name);
+
+int hfsplus_init_security(struct inode *inode, struct inode *dir,
+				const struct qstr *qstr);
+
+static inline int hfsplus_init_acl(struct inode *inode, struct inode *dir)
+{
+	/*TODO: implement*/
+	return 0;
+}
+
+static inline int hfsplus_init_inode_security(struct inode *inode,
+						struct inode *dir,
+						const struct qstr *qstr)
+{
+	int err;
+
+	err = hfsplus_init_acl(inode, dir);
+	if (!err)
+		err = hfsplus_init_security(inode, dir, qstr);
+	return err;
+}
+
+#endif

fs/hfsplus/xattr_security.c

+/*
+ * linux/fs/hfsplus/xattr_trusted.c
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Handler for storing security labels as extended attributes.
+ */
+
+#include <linux/security.h>
+#include "hfsplus_fs.h"
+#include "xattr.h"
+
+static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
+					void *buffer, size_t size, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_SECURITY_PREFIX);
+	strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
+
+	return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+}
+
+static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
+		const void *buffer, size_t size, int flags, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_SECURITY_PREFIX);
+	strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
+
+	return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+}
+
+static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
+		size_t list_size, const char *name, size_t name_len, int type)
+{
+	/*
+	 * This method is not used.
+	 * It is used hfsplus_listxattr() instead of generic_listxattr().
+	 */
+	return -EOPNOTSUPP;
+}
+
+static int hfsplus_initxattrs(struct inode *inode,
+				const struct xattr *xattr_array,
+				void *fs_info)
+{
+	const struct xattr *xattr;
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+	size_t xattr_name_len;
+	int err = 0;
+
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		xattr_name_len = strlen(xattr->name);
+
+		if (xattr_name_len == 0)
+			continue;
+
+		if (xattr_name_len + XATTR_SECURITY_PREFIX_LEN >
+				HFSPLUS_ATTR_MAX_STRLEN)
+			return -EOPNOTSUPP;
+
+		strcpy(xattr_name, XATTR_SECURITY_PREFIX);
+		strcpy(xattr_name +
+			XATTR_SECURITY_PREFIX_LEN, xattr->name);
+		memset(xattr_name +
+			XATTR_SECURITY_PREFIX_LEN + xattr_name_len, 0, 1);
+
+		err = __hfsplus_setxattr(inode, xattr_name,
+					xattr->value, xattr->value_len, 0);
+		if (err)
+			break;
+	}
+	return err;
+}
+
+int hfsplus_init_security(struct inode *inode, struct inode *dir,
+				const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					&hfsplus_initxattrs, NULL);
+}
+
+const struct xattr_handler hfsplus_xattr_security_handler = {
+	.prefix	= XATTR_SECURITY_PREFIX,
+	.list	= hfsplus_security_listxattr,
+	.get	= hfsplus_security_getxattr,
+	.set	= hfsplus_security_setxattr,
+};

fs/hfsplus/xattr_trusted.c

+/*
+ * linux/fs/hfsplus/xattr_trusted.c
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Handler for trusted extended attributes.
+ */
+
+#include "hfsplus_fs.h"
+#include "xattr.h"
+
+static int hfsplus_trusted_getxattr(struct dentry *dentry, const char *name,
+					void *buffer, size_t size, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len + XATTR_TRUSTED_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_TRUSTED_PREFIX);
+	strcpy(xattr_name + XATTR_TRUSTED_PREFIX_LEN, name);
+
+	return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+}
+
+static int hfsplus_trusted_setxattr(struct dentry *dentry, const char *name,
+		const void *buffer, size_t size, int flags, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len + XATTR_TRUSTED_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_TRUSTED_PREFIX);
+	strcpy(xattr_name + XATTR_TRUSTED_PREFIX_LEN, name);
+
+	return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+}
+
+static size_t hfsplus_trusted_listxattr(struct dentry *dentry, char *list,
+		size_t list_size, const char *name, size_t name_len, int type)
+{
+	/*
+	 * This method is not used.
+	 * It is used hfsplus_listxattr() instead of generic_listxattr().
+	 */
+	return -EOPNOTSUPP;
+}
+
+const struct xattr_handler hfsplus_xattr_trusted_handler = {
+	.prefix	= XATTR_TRUSTED_PREFIX,
+	.list	= hfsplus_trusted_listxattr,
+	.get	= hfsplus_trusted_getxattr,
+	.set	= hfsplus_trusted_setxattr,
+};

fs/hfsplus/xattr_user.c

+/*
+ * linux/fs/hfsplus/xattr_user.c
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Handler for user extended attributes.
+ */
+
+#include "hfsplus_fs.h"
+#include "xattr.h"
+
+static int hfsplus_user_getxattr(struct dentry *dentry, const char *name,
+					void *buffer, size_t size, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len + XATTR_USER_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_USER_PREFIX);
+	strcpy(xattr_name + XATTR_USER_PREFIX_LEN, name);
+
+	return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+}
+
+static int hfsplus_user_setxattr(struct dentry *dentry, const char *name,
+		const void *buffer, size_t size, int flags, int type)
+{
+	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+	size_t len = strlen(name);
+
+	if (!strcmp(name, ""))
+		return -EINVAL;
+
+	if (len + XATTR_USER_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+		return -EOPNOTSUPP;
+
+	strcpy(xattr_name, XATTR_USER_PREFIX);
+	strcpy(xattr_name + XATTR_USER_PREFIX_LEN, name);
+
+	return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+}
+
+static size_t hfsplus_user_listxattr(struct dentry *dentry, char *list,
+		size_t list_size, const char *name, size_t name_len, int type)
+{
+	/*
+	 * This method is not used.
+	 * It is used hfsplus_listxattr() instead of generic_listxattr().
+	 */
+	return -EOPNOTSUPP;
+}
+
+const struct xattr_handler hfsplus_xattr_user_handler = {
+	.prefix	= XATTR_USER_PREFIX,
+	.list	= hfsplus_user_listxattr,
+	.get	= hfsplus_user_getxattr,
+	.set	= hfsplus_user_setxattr,
+};