[deliverable/linux.git] / fs / f2fs / xattr.c

/*
 * fs/f2fs/xattr.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * Portions of this code from linux/fs/ext2/xattr.c
 *
 * Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@suse.de>
 *
 * Fix by Harrison Xing <harrison@mountainviewdata.com>.
 * Extended attributes for symlinks and special files added per
 *  suggestion of Luka Renko <luka.renko@hermes.si>.
 * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>,
 *  Red Hat Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/rwsem.h>
#include <linux/f2fs_fs.h>
#include <linux/security.h>
#include <linux/posix_acl_xattr.h>
#include "f2fs.h"
#include "xattr.h"

static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
		struct dentry *unused, struct inode *inode,
		const char *name, void *buffer, size_t size)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	switch (handler->flags) {
	case F2FS_XATTR_INDEX_USER:
		if (!test_opt(sbi, XATTR_USER))
			return -EOPNOTSUPP;
		break;
	case F2FS_XATTR_INDEX_TRUSTED:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		break;
	case F2FS_XATTR_INDEX_SECURITY:
		break;
	default:
		return -EINVAL;
	}
	return f2fs_getxattr(inode, handler->flags, name,
			     buffer, size, NULL);
}

static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
		struct dentry *unused, struct inode *inode,
		const char *name, const void *value,
		size_t size, int flags)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	switch (handler->flags) {
	case F2FS_XATTR_INDEX_USER:
		if (!test_opt(sbi, XATTR_USER))
			return -EOPNOTSUPP;
		break;
	case F2FS_XATTR_INDEX_TRUSTED:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		break;
	case F2FS_XATTR_INDEX_SECURITY:
		break;
	default:
		return -EINVAL;
	}
	return f2fs_setxattr(inode, handler->flags, name,
					value, size, NULL, flags);
}

static bool f2fs_xattr_user_list(struct dentry *dentry)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);

	return test_opt(sbi, XATTR_USER);
}

static bool f2fs_xattr_trusted_list(struct dentry *dentry)
{
	return capable(CAP_SYS_ADMIN);
}

static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
		struct dentry *unused, struct inode *inode,
		const char *name, void *buffer, size_t size)
{
	if (buffer)
		*((char *)buffer) = F2FS_I(inode)->i_advise;
	return sizeof(char);
}

static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
		struct dentry *unused, struct inode *inode,
		const char *name, const void *value,
		size_t size, int flags)
{
	if (!inode_owner_or_capable(inode))
		return -EPERM;
	if (value == NULL)
		return -EINVAL;

	F2FS_I(inode)->i_advise |= *(char *)value;
	f2fs_mark_inode_dirty_sync(inode);
	return 0;
}

#ifdef CONFIG_F2FS_FS_SECURITY
static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
		void *page)
{
	const struct xattr *xattr;
	int err = 0;

	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
		err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
				xattr->name, xattr->value,
				xattr->value_len, (struct page *)page, 0);
		if (err < 0)
			break;
	}
	return err;
}

int f2fs_init_security(struct inode *inode, struct inode *dir,
				const struct qstr *qstr, struct page *ipage)
{
	return security_inode_init_security(inode, dir, qstr,
				&f2fs_initxattrs, ipage);
}
#endif

const struct xattr_handler f2fs_xattr_user_handler = {
	.prefix	= XATTR_USER_PREFIX,
	.flags	= F2FS_XATTR_INDEX_USER,
	.list	= f2fs_xattr_user_list,
	.get	= f2fs_xattr_generic_get,
	.set	= f2fs_xattr_generic_set,
};

const struct xattr_handler f2fs_xattr_trusted_handler = {
	.prefix	= XATTR_TRUSTED_PREFIX,
	.flags	= F2FS_XATTR_INDEX_TRUSTED,
	.list	= f2fs_xattr_trusted_list,
	.get	= f2fs_xattr_generic_get,
	.set	= f2fs_xattr_generic_set,
};

const struct xattr_handler f2fs_xattr_advise_handler = {
	.name	= F2FS_SYSTEM_ADVISE_NAME,
	.flags	= F2FS_XATTR_INDEX_ADVISE,
	.get    = f2fs_xattr_advise_get,
	.set    = f2fs_xattr_advise_set,
};

const struct xattr_handler f2fs_xattr_security_handler = {
	.prefix	= XATTR_SECURITY_PREFIX,
	.flags	= F2FS_XATTR_INDEX_SECURITY,
	.get	= f2fs_xattr_generic_get,
	.set	= f2fs_xattr_generic_set,
};

static const struct xattr_handler *f2fs_xattr_handler_map[] = {
	[F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
#ifdef CONFIG_F2FS_FS_POSIX_ACL
	[F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
	[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
#endif
	[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
#ifdef CONFIG_F2FS_FS_SECURITY
	[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
#endif
	[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
};

const struct xattr_handler *f2fs_xattr_handlers[] = {
	&f2fs_xattr_user_handler,
#ifdef CONFIG_F2FS_FS_POSIX_ACL
	&posix_acl_access_xattr_handler,
	&posix_acl_default_xattr_handler,
#endif
	&f2fs_xattr_trusted_handler,
#ifdef CONFIG_F2FS_FS_SECURITY
	&f2fs_xattr_security_handler,
#endif
	&f2fs_xattr_advise_handler,
	NULL,
};

static inline const struct xattr_handler *f2fs_xattr_handler(int index)
{
	const struct xattr_handler *handler = NULL;

	if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
		handler = f2fs_xattr_handler_map[index];
	return handler;
}

static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int index,
					size_t len, const char *name)
{
	struct f2fs_xattr_entry *entry;

	list_for_each_xattr(entry, base_addr) {
		if (entry->e_name_index != index)
			continue;
		if (entry->e_name_len != len)
			continue;
		if (!memcmp(entry->e_name, name, len))
			break;
	}
	return entry;
}

static void *read_all_xattrs(struct inode *inode, struct page *ipage)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct f2fs_xattr_header *header;
	size_t size = PAGE_SIZE, inline_size = 0;
	void *txattr_addr;

	inline_size = inline_xattr_size(inode);

	txattr_addr = kzalloc(inline_size + size, GFP_F2FS_ZERO);
	if (!txattr_addr)
		return NULL;

	/* read from inline xattr */
	if (inline_size) {
		struct page *page = NULL;
		void *inline_addr;

		if (ipage) {
			inline_addr = inline_xattr_addr(ipage);
		} else {
			page = get_node_page(sbi, inode->i_ino);
			if (IS_ERR(page))
				goto fail;
			inline_addr = inline_xattr_addr(page);
		}
		memcpy(txattr_addr, inline_addr, inline_size);
		f2fs_put_page(page, 1);
	}

	/* read from xattr node block */
	if (F2FS_I(inode)->i_xattr_nid) {
		struct page *xpage;
		void *xattr_addr;

		/* The inode already has an extended attribute block. */
		xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
		if (IS_ERR(xpage))
			goto fail;

		xattr_addr = page_address(xpage);
		memcpy(txattr_addr + inline_size, xattr_addr, PAGE_SIZE);
		f2fs_put_page(xpage, 1);
	}

	header = XATTR_HDR(txattr_addr);

	/* never been allocated xattrs */
	if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
		header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
		header->h_refcount = cpu_to_le32(1);
	}
	return txattr_addr;
fail:
	kzfree(txattr_addr);
	return NULL;
}

static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
				void *txattr_addr, struct page *ipage)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	size_t inline_size = 0;
	void *xattr_addr;
	struct page *xpage;
	nid_t new_nid = 0;
	int err;

	inline_size = inline_xattr_size(inode);

	if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
		if (!alloc_nid(sbi, &new_nid))
			return -ENOSPC;

	/* write to inline xattr */
	if (inline_size) {
		struct page *page = NULL;
		void *inline_addr;

		if (ipage) {
			inline_addr = inline_xattr_addr(ipage);
			f2fs_wait_on_page_writeback(ipage, NODE, true);
			set_page_dirty(ipage);
		} else {
			page = get_node_page(sbi, inode->i_ino);
			if (IS_ERR(page)) {
				alloc_nid_failed(sbi, new_nid);
				return PTR_ERR(page);
			}
			inline_addr = inline_xattr_addr(page);
			f2fs_wait_on_page_writeback(page, NODE, true);
		}
		memcpy(inline_addr, txattr_addr, inline_size);
		f2fs_put_page(page, 1);

		/* no need to use xattr node block */
		if (hsize <= inline_size) {
			err = truncate_xattr_node(inode, ipage);
			alloc_nid_failed(sbi, new_nid);
			return err;
		}
	}

	/* write to xattr node block */
	if (F2FS_I(inode)->i_xattr_nid) {
		xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
		if (IS_ERR(xpage)) {
			alloc_nid_failed(sbi, new_nid);
			return PTR_ERR(xpage);
		}
		f2fs_bug_on(sbi, new_nid);
		f2fs_wait_on_page_writeback(xpage, NODE, true);
	} else {
		struct dnode_of_data dn;
		set_new_dnode(&dn, inode, NULL, NULL, new_nid);
		xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
		if (IS_ERR(xpage)) {
			alloc_nid_failed(sbi, new_nid);
			return PTR_ERR(xpage);
		}
		alloc_nid_done(sbi, new_nid);
	}

	xattr_addr = page_address(xpage);
	memcpy(xattr_addr, txattr_addr + inline_size, PAGE_SIZE -
						sizeof(struct node_footer));
	set_page_dirty(xpage);
	f2fs_put_page(xpage, 1);

	/* need to checkpoint during fsync */
	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
	return 0;
}

int f2fs_getxattr(struct inode *inode, int index, const char *name,
		void *buffer, size_t buffer_size, struct page *ipage)
{
	struct f2fs_xattr_entry *entry;
	void *base_addr;
	int error = 0;
	size_t size, len;

	if (name == NULL)
		return -EINVAL;

	len = strlen(name);
	if (len > F2FS_NAME_LEN)
		return -ERANGE;

	base_addr = read_all_xattrs(inode, ipage);
	if (!base_addr)
		return -ENOMEM;

	entry = __find_xattr(base_addr, index, len, name);
	if (IS_XATTR_LAST_ENTRY(entry)) {
		error = -ENODATA;
		goto cleanup;
	}

	size = le16_to_cpu(entry->e_value_size);

	if (buffer && size > buffer_size) {
		error = -ERANGE;
		goto cleanup;
	}

	if (buffer) {
		char *pval = entry->e_name + entry->e_name_len;
		memcpy(buffer, pval, size);
	}
	error = size;

cleanup:
	kzfree(base_addr);
	return error;
}

ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
	struct inode *inode = d_inode(dentry);
	struct f2fs_xattr_entry *entry;
	void *base_addr;
	int error = 0;
	size_t rest = buffer_size;

	base_addr = read_all_xattrs(inode, NULL);
	if (!base_addr)
		return -ENOMEM;

	list_for_each_xattr(entry, base_addr) {
		const struct xattr_handler *handler =
			f2fs_xattr_handler(entry->e_name_index);
		const char *prefix;
		size_t prefix_len;
		size_t size;

		if (!handler || (handler->list && !handler->list(dentry)))
			continue;

		prefix = handler->prefix ?: handler->name;
		prefix_len = strlen(prefix);
		size = prefix_len + entry->e_name_len + 1;
		if (buffer) {
			if (size > rest) {
				error = -ERANGE;
				goto cleanup;
			}
			memcpy(buffer, prefix, prefix_len);
			buffer += prefix_len;
			memcpy(buffer, entry->e_name, entry->e_name_len);
			buffer += entry->e_name_len;
			*buffer++ = 0;
		}
		rest -= size;
	}
	error = buffer_size - rest;
cleanup:
	kzfree(base_addr);
	return error;
}

static int __f2fs_setxattr(struct inode *inode, int index,
			const char *name, const void *value, size_t size,
			struct page *ipage, int flags)
{
	struct f2fs_xattr_entry *here, *last;
	void *base_addr;
	int found, newsize;
	size_t len;
	__u32 new_hsize;
	int error = 0;

	if (name == NULL)
		return -EINVAL;

	if (value == NULL)
		size = 0;

	len = strlen(name);

	if (len > F2FS_NAME_LEN)
		return -ERANGE;

	if (size > MAX_VALUE_LEN(inode))
		return -E2BIG;

	base_addr = read_all_xattrs(inode, ipage);
	if (!base_addr)
		return -ENOMEM;

	/* find entry with wanted name. */
	here = __find_xattr(base_addr, index, len, name);

	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;

	if ((flags & XATTR_REPLACE) && !found) {
		error = -ENODATA;
		goto exit;
	} else if ((flags & XATTR_CREATE) && found) {
		error = -EEXIST;
		goto exit;
	}

	last = here;
	while (!IS_XATTR_LAST_ENTRY(last))
		last = XATTR_NEXT_ENTRY(last);

	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);

	/* 1. Check space */
	if (value) {
		int free;
		/*
		 * If value is NULL, it is remove operation.
		 * In case of update operation, we calculate free.
		 */
		free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
		if (found)
			free = free + ENTRY_SIZE(here);

		if (unlikely(free < newsize)) {
			error = -E2BIG;
			goto exit;
		}
	}

	/* 2. Remove old entry */
	if (found) {
		/*
		 * If entry is found, remove old entry.
		 * If not found, remove operation is not needed.
		 */
		struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
		int oldsize = ENTRY_SIZE(here);

		memmove(here, next, (char *)last - (char *)next);
		last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
		memset(last, 0, oldsize);
	}

	new_hsize = (char *)last - (char *)base_addr;

	/* 3. Write new entry */
	if (value) {
		char *pval;
		/*
		 * Before we come here, old entry is removed.
		 * We just write new entry.
		 */
		last->e_name_index = index;
		last->e_name_len = len;
		memcpy(last->e_name, name, len);
		pval = last->e_name + len;
		memcpy(pval, value, size);
		last->e_value_size = cpu_to_le16(size);
		new_hsize += newsize;
	}

	error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
	if (error)
		goto exit;

	if (is_inode_flag_set(inode, FI_ACL_MODE)) {
		inode->i_mode = F2FS_I(inode)->i_acl_mode;
		inode->i_ctime = CURRENT_TIME;
		clear_inode_flag(inode, FI_ACL_MODE);
	}
	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
			!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
		f2fs_set_encrypted_inode(inode);
	f2fs_mark_inode_dirty_sync(inode);
	if (!error && S_ISDIR(inode->i_mode))
		set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
exit:
	kzfree(base_addr);
	return error;
}

int f2fs_setxattr(struct inode *inode, int index, const char *name,
				const void *value, size_t size,
				struct page *ipage, int flags)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	int err;

	/* this case is only from init_inode_metadata */
	if (ipage)
		return __f2fs_setxattr(inode, index, name, value,
						size, ipage, flags);
	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);
	/* protect xattr_ver */
	down_write(&F2FS_I(inode)->i_sem);
	err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
	up_write(&F2FS_I(inode)->i_sem);
	f2fs_unlock_op(sbi);

	f2fs_update_time(sbi, REQ_TIME);
	return err;
}
Commit	Line	Data
0a8165d7	1	/*
af48b85b JK	2	* fs/f2fs/xattr.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* Portions of this code from linux/fs/ext2/xattr.c
	8	*
	9	* Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@suse.de>
	10	*
	11	* Fix by Harrison Xing <harrison@mountainviewdata.com>.
	12	* Extended attributes for symlinks and special files added per
	13	* suggestion of Luka Renko <luka.renko@hermes.si>.
	14	* xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>,
	15	* Red Hat Inc.
	16	*
	17	* This program is free software; you can redistribute it and/or modify
	18	* it under the terms of the GNU General Public License version 2 as
	19	* published by the Free Software Foundation.
	20	*/
	21	#include <linux/rwsem.h>
	22	#include <linux/f2fs_fs.h>
8ae8f162	23	#include <linux/security.h>
a6dda0e6	24	#include <linux/posix_acl_xattr.h>
af48b85b JK	25	#include "f2fs.h"
	26	#include "xattr.h"
	27
d9a82a04	28	static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
b296821a AV	29	struct dentry unused, struct inode inode,
b296821a AV	30	const char name, void buffer, size_t size)
af48b85b	31	{
b296821a	32	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
af48b85b	33
d9a82a04	34	switch (handler->flags) {
af48b85b JK	35	case F2FS_XATTR_INDEX_USER:
	36	if (!test_opt(sbi, XATTR_USER))
	37	return -EOPNOTSUPP;
	38	break;
	39	case F2FS_XATTR_INDEX_TRUSTED:
	40	if (!capable(CAP_SYS_ADMIN))
	41	return -EPERM;
	42	break;
8ae8f162 JK	43	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162 JK	44	break;
af48b85b JK	45	default:
	46	return -EINVAL;
	47	}
b296821a	48	return f2fs_getxattr(inode, handler->flags, name,
d9a82a04	49	buffer, size, NULL);
af48b85b JK	50	}
af48b85b JK	51
d9a82a04	52	static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
59301226 AV	53	struct dentry unused, struct inode inode,
59301226 AV	54	const char name, const void value,
d9a82a04	55	size_t size, int flags)
af48b85b	56	{
59301226	57	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
af48b85b	58
d9a82a04	59	switch (handler->flags) {
af48b85b JK	60	case F2FS_XATTR_INDEX_USER:
	61	if (!test_opt(sbi, XATTR_USER))
	62	return -EOPNOTSUPP;
	63	break;
	64	case F2FS_XATTR_INDEX_TRUSTED:
	65	if (!capable(CAP_SYS_ADMIN))
	66	return -EPERM;
	67	break;
8ae8f162 JK	68	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162 JK	69	break;
af48b85b JK	70	default:
	71	return -EINVAL;
	72	}
59301226	73	return f2fs_setxattr(inode, handler->flags, name,
c02745ef	74	value, size, NULL, flags);
af48b85b JK	75	}
af48b85b JK	76
764a5c6b	77	static bool f2fs_xattr_user_list(struct dentry *dentry)
573ea5fc	78	{
764a5c6b AG	79	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	80
	81	return test_opt(sbi, XATTR_USER);
	82	}
573ea5fc	83
764a5c6b AG	84	static bool f2fs_xattr_trusted_list(struct dentry *dentry)
	85	{
	86	return capable(CAP_SYS_ADMIN);
573ea5fc JK	87	}
573ea5fc JK	88
d9a82a04	89	static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
b296821a AV	90	struct dentry unused, struct inode inode,
b296821a AV	91	const char name, void buffer, size_t size)
573ea5fc	92	{
84e97c27 CY	93	if (buffer)
84e97c27 CY	94	((char )buffer) = F2FS_I(inode)->i_advise;
573ea5fc JK	95	return sizeof(char);
	96	}
	97
d9a82a04	98	static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
59301226 AV	99	struct dentry unused, struct inode inode,
59301226 AV	100	const char name, const void value,
d9a82a04	101	size_t size, int flags)
573ea5fc	102	{
573ea5fc JK	103	if (!inode_owner_or_capable(inode))
	104	return -EPERM;
	105	if (value == NULL)
	106	return -EINVAL;
	107
	108	F2FS_I(inode)->i_advise \|= (char )value;
b56ab837	109	f2fs_mark_inode_dirty_sync(inode);
573ea5fc JK	110	return 0;
	111	}
	112
8ae8f162 JK	113	#ifdef CONFIG_F2FS_FS_SECURITY
	114	static int f2fs_initxattrs(struct inode inode, const struct xattr xattr_array,
	115	void *page)
	116	{
	117	const struct xattr *xattr;
	118	int err = 0;
	119
	120	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
d631abda	121	err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
8ae8f162	122	xattr->name, xattr->value,
c02745ef	123	xattr->value_len, (struct page *)page, 0);
8ae8f162 JK	124	if (err < 0)
	125	break;
	126	}
	127	return err;
	128	}
	129
	130	int f2fs_init_security(struct inode inode, struct inode dir,
	131	const struct qstr qstr, struct page ipage)
	132	{
	133	return security_inode_init_security(inode, dir, qstr,
	134	&f2fs_initxattrs, ipage);
	135	}
	136	#endif
	137
af48b85b JK	138	const struct xattr_handler f2fs_xattr_user_handler = {
	139	.prefix = XATTR_USER_PREFIX,
	140	.flags = F2FS_XATTR_INDEX_USER,
764a5c6b	141	.list = f2fs_xattr_user_list,
af48b85b JK	142	.get = f2fs_xattr_generic_get,
	143	.set = f2fs_xattr_generic_set,
	144	};
	145
	146	const struct xattr_handler f2fs_xattr_trusted_handler = {
	147	.prefix = XATTR_TRUSTED_PREFIX,
	148	.flags = F2FS_XATTR_INDEX_TRUSTED,
764a5c6b	149	.list = f2fs_xattr_trusted_list,
af48b85b JK	150	.get = f2fs_xattr_generic_get,
	151	.set = f2fs_xattr_generic_set,
	152	};
	153
573ea5fc	154	const struct xattr_handler f2fs_xattr_advise_handler = {
98e9cb57	155	.name = F2FS_SYSTEM_ADVISE_NAME,
573ea5fc	156	.flags = F2FS_XATTR_INDEX_ADVISE,
573ea5fc JK	157	.get = f2fs_xattr_advise_get,
	158	.set = f2fs_xattr_advise_set,
	159	};
	160
8ae8f162 JK	161	const struct xattr_handler f2fs_xattr_security_handler = {
	162	.prefix = XATTR_SECURITY_PREFIX,
	163	.flags = F2FS_XATTR_INDEX_SECURITY,
8ae8f162 JK	164	.get = f2fs_xattr_generic_get,
	165	.set = f2fs_xattr_generic_set,
	166	};
	167
af48b85b JK	168	static const struct xattr_handler *f2fs_xattr_handler_map[] = {
	169	[F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
	170	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	171	[F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
a6dda0e6 CH	172	[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
af48b85b JK	173	#endif
af48b85b JK	174	[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
8ae8f162 JK	175	#ifdef CONFIG_F2FS_FS_SECURITY
	176	[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
	177	#endif
af48b85b JK	178	[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
	179	};
	180
	181	const struct xattr_handler *f2fs_xattr_handlers[] = {
	182	&f2fs_xattr_user_handler,
	183	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	184	&posix_acl_access_xattr_handler,
a6dda0e6 CH	185	&posix_acl_default_xattr_handler,
af48b85b JK	186	#endif
af48b85b JK	187	&f2fs_xattr_trusted_handler,
8ae8f162 JK	188	#ifdef CONFIG_F2FS_FS_SECURITY
	189	&f2fs_xattr_security_handler,
	190	#endif
af48b85b JK	191	&f2fs_xattr_advise_handler,
	192	NULL,
	193	};
	194
e1123268	195	static inline const struct xattr_handler *f2fs_xattr_handler(int index)
af48b85b JK	196	{
	197	const struct xattr_handler *handler = NULL;
	198
e1123268 JK	199	if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
e1123268 JK	200	handler = f2fs_xattr_handler_map[index];
af48b85b JK	201	return handler;
	202	}
	203
e1123268 JK	204	static struct f2fs_xattr_entry __find_xattr(void base_addr, int index,
e1123268 JK	205	size_t len, const char *name)
dd9cfe23 JK	206	{
	207	struct f2fs_xattr_entry *entry;
	208
	209	list_for_each_xattr(entry, base_addr) {
e1123268	210	if (entry->e_name_index != index)
dd9cfe23	211	continue;
e1123268	212	if (entry->e_name_len != len)
dd9cfe23	213	continue;
e1123268	214	if (!memcmp(entry->e_name, name, len))
dd9cfe23 JK	215	break;
	216	}
	217	return entry;
	218	}
	219
65985d93 JK	220	static void read_all_xattrs(struct inode inode, struct page *ipage)
65985d93 JK	221	{
4081363f	222	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
65985d93 JK	223	struct f2fs_xattr_header *header;
	224	size_t size = PAGE_SIZE, inline_size = 0;
	225	void *txattr_addr;
	226
	227	inline_size = inline_xattr_size(inode);
	228
808a1d74	229	txattr_addr = kzalloc(inline_size + size, GFP_F2FS_ZERO);
65985d93 JK	230	if (!txattr_addr)
	231	return NULL;
	232
	233	/* read from inline xattr */
	234	if (inline_size) {
	235	struct page *page = NULL;
	236	void *inline_addr;
	237
	238	if (ipage) {
	239	inline_addr = inline_xattr_addr(ipage);
	240	} else {
	241	page = get_node_page(sbi, inode->i_ino);
	242	if (IS_ERR(page))
	243	goto fail;
	244	inline_addr = inline_xattr_addr(page);
	245	}
	246	memcpy(txattr_addr, inline_addr, inline_size);
	247	f2fs_put_page(page, 1);
	248	}
	249
	250	/* read from xattr node block */
	251	if (F2FS_I(inode)->i_xattr_nid) {
	252	struct page *xpage;
	253	void *xattr_addr;
	254
	255	/* The inode already has an extended attribute block. */
	256	xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
	257	if (IS_ERR(xpage))
	258	goto fail;
	259
	260	xattr_addr = page_address(xpage);
	261	memcpy(txattr_addr + inline_size, xattr_addr, PAGE_SIZE);
	262	f2fs_put_page(xpage, 1);
	263	}
	264
	265	header = XATTR_HDR(txattr_addr);
	266
	267	/* never been allocated xattrs */
	268	if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
	269	header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
	270	header->h_refcount = cpu_to_le32(1);
	271	}
	272	return txattr_addr;
	273	fail:
	274	kzfree(txattr_addr);
	275	return NULL;
	276	}
	277
	278	static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
	279	void txattr_addr, struct page ipage)
	280	{
4081363f	281	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
65985d93 JK	282	size_t inline_size = 0;
	283	void *xattr_addr;
	284	struct page *xpage;
	285	nid_t new_nid = 0;
	286	int err;
	287
	288	inline_size = inline_xattr_size(inode);
	289
	290	if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
	291	if (!alloc_nid(sbi, &new_nid))
	292	return -ENOSPC;
	293
	294	/* write to inline xattr */
	295	if (inline_size) {
	296	struct page *page = NULL;
	297	void *inline_addr;
	298
	299	if (ipage) {
	300	inline_addr = inline_xattr_addr(ipage);
fec1d657	301	f2fs_wait_on_page_writeback(ipage, NODE, true);
ee6d182f	302	set_page_dirty(ipage);
65985d93 JK	303	} else {
	304	page = get_node_page(sbi, inode->i_ino);
	305	if (IS_ERR(page)) {
	306	alloc_nid_failed(sbi, new_nid);
	307	return PTR_ERR(page);
	308	}
	309	inline_addr = inline_xattr_addr(page);
fec1d657	310	f2fs_wait_on_page_writeback(page, NODE, true);
65985d93 JK	311	}
	312	memcpy(inline_addr, txattr_addr, inline_size);
	313	f2fs_put_page(page, 1);
	314
	315	/* no need to use xattr node block */
	316	if (hsize <= inline_size) {
	317	err = truncate_xattr_node(inode, ipage);
	318	alloc_nid_failed(sbi, new_nid);
	319	return err;
	320	}
	321	}
	322
	323	/* write to xattr node block */
	324	if (F2FS_I(inode)->i_xattr_nid) {
	325	xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
	326	if (IS_ERR(xpage)) {
	327	alloc_nid_failed(sbi, new_nid);
	328	return PTR_ERR(xpage);
	329	}
9850cf4a	330	f2fs_bug_on(sbi, new_nid);
fec1d657	331	f2fs_wait_on_page_writeback(xpage, NODE, true);
65985d93 JK	332	} else {
	333	struct dnode_of_data dn;
	334	set_new_dnode(&dn, inode, NULL, NULL, new_nid);
	335	xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
	336	if (IS_ERR(xpage)) {
	337	alloc_nid_failed(sbi, new_nid);
	338	return PTR_ERR(xpage);
	339	}
	340	alloc_nid_done(sbi, new_nid);
	341	}
	342
	343	xattr_addr = page_address(xpage);
	344	memcpy(xattr_addr, txattr_addr + inline_size, PAGE_SIZE -
	345	sizeof(struct node_footer));
	346	set_page_dirty(xpage);
	347	f2fs_put_page(xpage, 1);
	348
	349	/* need to checkpoint during fsync */
	350	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
	351	return 0;
	352	}
	353
e1123268	354	int f2fs_getxattr(struct inode inode, int index, const char name,
bce8d112	355	void buffer, size_t buffer_size, struct page ipage)
af48b85b	356	{
af48b85b	357	struct f2fs_xattr_entry *entry;
65985d93	358	void *base_addr;
dd9cfe23	359	int error = 0;
e1123268	360	size_t size, len;
af48b85b JK	361
	362	if (name == NULL)
	363	return -EINVAL;
e1123268 JK	364
	365	len = strlen(name);
	366	if (len > F2FS_NAME_LEN)
6e452d69	367	return -ERANGE;
af48b85b	368
bce8d112	369	base_addr = read_all_xattrs(inode, ipage);
65985d93 JK	370	if (!base_addr)
65985d93 JK	371	return -ENOMEM;
af48b85b	372
e1123268	373	entry = __find_xattr(base_addr, index, len, name);
dd9cfe23	374	if (IS_XATTR_LAST_ENTRY(entry)) {
af48b85b JK	375	error = -ENODATA;
	376	goto cleanup;
	377	}
	378
e1123268	379	size = le16_to_cpu(entry->e_value_size);
af48b85b	380
e1123268	381	if (buffer && size > buffer_size) {
af48b85b JK	382	error = -ERANGE;
	383	goto cleanup;
	384	}
	385
	386	if (buffer) {
	387	char *pval = entry->e_name + entry->e_name_len;
e1123268	388	memcpy(buffer, pval, size);
af48b85b	389	}
e1123268	390	error = size;
af48b85b JK	391
af48b85b JK	392	cleanup:
65985d93	393	kzfree(base_addr);
af48b85b JK	394	return error;
	395	}
	396
	397	ssize_t f2fs_listxattr(struct dentry dentry, char buffer, size_t buffer_size)
	398	{
2b0143b5	399	struct inode *inode = d_inode(dentry);
af48b85b	400	struct f2fs_xattr_entry *entry;
af48b85b JK	401	void *base_addr;
	402	int error = 0;
	403	size_t rest = buffer_size;
	404
65985d93 JK	405	base_addr = read_all_xattrs(inode, NULL);
	406	if (!base_addr)
	407	return -ENOMEM;
af48b85b JK	408
	409	list_for_each_xattr(entry, base_addr) {
	410	const struct xattr_handler *handler =
	411	f2fs_xattr_handler(entry->e_name_index);
764a5c6b AG	412	const char *prefix;
764a5c6b AG	413	size_t prefix_len;
af48b85b JK	414	size_t size;
af48b85b JK	415
764a5c6b	416	if (!handler \|\| (handler->list && !handler->list(dentry)))
af48b85b JK	417	continue;
af48b85b JK	418
764a5c6b AG	419	prefix = handler->prefix ?: handler->name;
	420	prefix_len = strlen(prefix);
	421	size = prefix_len + entry->e_name_len + 1;
	422	if (buffer) {
	423	if (size > rest) {
	424	error = -ERANGE;
	425	goto cleanup;
	426	}
	427	memcpy(buffer, prefix, prefix_len);
	428	buffer += prefix_len;
	429	memcpy(buffer, entry->e_name, entry->e_name_len);
	430	buffer += entry->e_name_len;
	431	*buffer++ = 0;
af48b85b	432	}
af48b85b JK	433	rest -= size;
	434	}
	435	error = buffer_size - rest;
	436	cleanup:
65985d93	437	kzfree(base_addr);
af48b85b JK	438	return error;
	439	}
	440
e1123268 JK	441	static int __f2fs_setxattr(struct inode *inode, int index,
e1123268 JK	442	const char name, const void value, size_t size,
c02745ef	443	struct page *ipage, int flags)
af48b85b	444	{
af48b85b	445	struct f2fs_xattr_entry here, last;
af48b85b	446	void *base_addr;
65985d93	447	int found, newsize;
e1123268	448	size_t len;
65985d93	449	__u32 new_hsize;
a0995af6	450	int error = 0;
af48b85b JK	451
	452	if (name == NULL)
	453	return -EINVAL;
af48b85b JK	454
af48b85b JK	455	if (value == NULL)
e1123268	456	size = 0;
af48b85b	457
e1123268	458	len = strlen(name);
7c909772	459
037fe70c	460	if (len > F2FS_NAME_LEN)
af48b85b JK	461	return -ERANGE;
af48b85b JK	462
037fe70c CY	463	if (size > MAX_VALUE_LEN(inode))
	464	return -E2BIG;
	465
65985d93 JK	466	base_addr = read_all_xattrs(inode, ipage);
65985d93 JK	467	if (!base_addr)
a0995af6	468	return -ENOMEM;
af48b85b JK	469
af48b85b JK	470	/* find entry with wanted name. */
e1123268	471	here = __find_xattr(base_addr, index, len, name);
af48b85b	472
dd9cfe23	473	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
af48b85b	474
916decbf JK	475	if ((flags & XATTR_REPLACE) && !found) {
	476	error = -ENODATA;
	477	goto exit;
	478	} else if ((flags & XATTR_CREATE) && found) {
	479	error = -EEXIST;
	480	goto exit;
	481	}
	482
	483	last = here;
af48b85b JK	484	while (!IS_XATTR_LAST_ENTRY(last))
	485	last = XATTR_NEXT_ENTRY(last);
	486
e1123268	487	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
af48b85b JK	488
	489	/* 1. Check space */
	490	if (value) {
65985d93 JK	491	int free;
	492	/*
	493	* If value is NULL, it is remove operation.
e1c42045	494	* In case of update operation, we calculate free.
af48b85b	495	*/
65985d93	496	free = MIN_OFFSET(inode) - ((char )last - (char )base_addr);
af48b85b	497	if (found)
cc3de6a3	498	free = free + ENTRY_SIZE(here);
af48b85b	499
6bacf52f	500	if (unlikely(free < newsize)) {
58457f1c	501	error = -E2BIG;
65985d93	502	goto exit;
af48b85b JK	503	}
	504	}
	505
	506	/* 2. Remove old entry */
	507	if (found) {
65985d93 JK	508	/*
65985d93 JK	509	* If entry is found, remove old entry.
af48b85b JK	510	* If not found, remove operation is not needed.
	511	*/
	512	struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
	513	int oldsize = ENTRY_SIZE(here);
	514
	515	memmove(here, next, (char )last - (char )next);
	516	last = (struct f2fs_xattr_entry )((char )last - oldsize);
	517	memset(last, 0, oldsize);
	518	}
	519
65985d93 JK	520	new_hsize = (char )last - (char )base_addr;
65985d93 JK	521
af48b85b JK	522	/* 3. Write new entry */
af48b85b JK	523	if (value) {
65985d93 JK	524	char *pval;
	525	/*
	526	* Before we come here, old entry is removed.
	527	* We just write new entry.
	528	*/
e1123268 JK	529	last->e_name_index = index;
	530	last->e_name_len = len;
	531	memcpy(last->e_name, name, len);
	532	pval = last->e_name + len;
	533	memcpy(pval, value, size);
	534	last->e_value_size = cpu_to_le16(size);
65985d93	535	new_hsize += newsize;
af48b85b JK	536	}
af48b85b JK	537
65985d93 JK	538	error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
	539	if (error)
	540	goto exit;
af48b85b	541
91942321 JK	542	if (is_inode_flag_set(inode, FI_ACL_MODE)) {
91942321 JK	543	inode->i_mode = F2FS_I(inode)->i_acl_mode;
af48b85b	544	inode->i_ctime = CURRENT_TIME;
91942321	545	clear_inode_flag(inode, FI_ACL_MODE);
af48b85b	546	}
f424f664 JK	547	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
	548	!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
	549	f2fs_set_encrypted_inode(inode);
b56ab837	550	f2fs_mark_inode_dirty_sync(inode);
bbf156f7 JK	551	if (!error && S_ISDIR(inode->i_mode))
bbf156f7 JK	552	set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
7c909772	553	exit:
65985d93	554	kzfree(base_addr);
af48b85b JK	555	return error;
af48b85b JK	556	}
52ab9560	557
e1123268 JK	558	int f2fs_setxattr(struct inode inode, int index, const char name,
e1123268 JK	559	const void *value, size_t size,
c02745ef	560	struct page *ipage, int flags)
52ab9560	561	{
4081363f	562	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
52ab9560 RK	563	int err;
52ab9560 RK	564
d631abda JK	565	/* this case is only from init_inode_metadata */
	566	if (ipage)
	567	return __f2fs_setxattr(inode, index, name, value,
	568	size, ipage, flags);
2c4db1a6	569	f2fs_balance_fs(sbi, true);
52ab9560	570
e479556b	571	f2fs_lock_op(sbi);
d928bfbf JK	572	/* protect xattr_ver */
d928bfbf JK	573	down_write(&F2FS_I(inode)->i_sem);
c02745ef	574	err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
d928bfbf	575	up_write(&F2FS_I(inode)->i_sem);
e479556b	576	f2fs_unlock_op(sbi);
52ab9560	577
d0239e1b	578	f2fs_update_time(sbi, REQ_TIME);
52ab9560 RK	579	return err;
52ab9560 RK	580	}