[linux-2.6-block.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 *dentry, const char *name, void *buffer,
		size_t size)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_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(d_inode(dentry), handler->flags, name,
			     buffer, size, NULL);
}

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

	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 *dentry, const char *name, const void *value,
		size_t size, int flags)
{
	struct inode *inode = d_inode(dentry);

	if (!inode_owner_or_capable(inode))
		return -EPERM;
	if (value == NULL)
		return -EINVAL;

	F2FS_I(inode)->i_advise |= *(char *)value;
	mark_inode_dirty(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);
		} 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_inode_info *fi = F2FS_I(inode);
	struct f2fs_xattr_entry *here, *last;
	void *base_addr;
	int found, newsize;
	size_t len;
	__u32 new_hsize;
	int error = -ENOMEM;

	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)
		goto exit;

	/* 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 = -ENOSPC;
			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.
		 */
		memset(last, 0, newsize);
		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(fi, FI_ACL_MODE)) {
		inode->i_mode = fi->i_acl_mode;
		inode->i_ctime = CURRENT_TIME;
		clear_inode_flag(fi, FI_ACL_MODE);
	}
	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
			!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
		f2fs_set_encrypted_inode(inode);

	if (ipage)
		update_inode(inode, ipage);
	else
		update_inode_page(inode);
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 AG	28	static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
	29	struct dentry dentry, const char name, void *buffer,
	30	size_t size)
af48b85b JK	31	{
	32	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	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	}
d9a82a04 AG	48	return f2fs_getxattr(d_inode(dentry), handler->flags, name,
d9a82a04 AG	49	buffer, size, NULL);
af48b85b JK	50	}
af48b85b JK	51
d9a82a04 AG	52	static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
	53	struct dentry dentry, const char name, const void *value,
	54	size_t size, int flags)
af48b85b JK	55	{
	56	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	57
d9a82a04	58	switch (handler->flags) {
af48b85b JK	59	case F2FS_XATTR_INDEX_USER:
	60	if (!test_opt(sbi, XATTR_USER))
	61	return -EOPNOTSUPP;
	62	break;
	63	case F2FS_XATTR_INDEX_TRUSTED:
	64	if (!capable(CAP_SYS_ADMIN))
	65	return -EPERM;
	66	break;
8ae8f162 JK	67	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162 JK	68	break;
af48b85b JK	69	default:
	70	return -EINVAL;
	71	}
d9a82a04	72	return f2fs_setxattr(d_inode(dentry), handler->flags, name,
c02745ef	73	value, size, NULL, flags);
af48b85b JK	74	}
af48b85b JK	75
764a5c6b	76	static bool f2fs_xattr_user_list(struct dentry *dentry)
573ea5fc	77	{
764a5c6b AG	78	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	79
	80	return test_opt(sbi, XATTR_USER);
	81	}
573ea5fc	82
764a5c6b AG	83	static bool f2fs_xattr_trusted_list(struct dentry *dentry)
	84	{
	85	return capable(CAP_SYS_ADMIN);
573ea5fc JK	86	}
573ea5fc JK	87
d9a82a04 AG	88	static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
	89	struct dentry dentry, const char name, void *buffer,
	90	size_t size)
573ea5fc	91	{
2b0143b5	92	struct inode *inode = d_inode(dentry);
573ea5fc	93
84e97c27 CY	94	if (buffer)
84e97c27 CY	95	((char )buffer) = F2FS_I(inode)->i_advise;
573ea5fc JK	96	return sizeof(char);
	97	}
	98
d9a82a04 AG	99	static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
	100	struct dentry dentry, const char name, const void *value,
	101	size_t size, int flags)
573ea5fc	102	{
2b0143b5	103	struct inode *inode = d_inode(dentry);
573ea5fc	104
573ea5fc JK	105	if (!inode_owner_or_capable(inode))
	106	return -EPERM;
	107	if (value == NULL)
	108	return -EINVAL;
	109
	110	F2FS_I(inode)->i_advise \|= (char )value;
30c62fdb	111	mark_inode_dirty(inode);
573ea5fc JK	112	return 0;
	113	}
	114
8ae8f162 JK	115	#ifdef CONFIG_F2FS_FS_SECURITY
	116	static int f2fs_initxattrs(struct inode inode, const struct xattr xattr_array,
	117	void *page)
	118	{
	119	const struct xattr *xattr;
	120	int err = 0;
	121
	122	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
d631abda	123	err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
8ae8f162	124	xattr->name, xattr->value,
c02745ef	125	xattr->value_len, (struct page *)page, 0);
8ae8f162 JK	126	if (err < 0)
	127	break;
	128	}
	129	return err;
	130	}
	131
	132	int f2fs_init_security(struct inode inode, struct inode dir,
	133	const struct qstr qstr, struct page ipage)
	134	{
	135	return security_inode_init_security(inode, dir, qstr,
	136	&f2fs_initxattrs, ipage);
	137	}
	138	#endif
	139
af48b85b JK	140	const struct xattr_handler f2fs_xattr_user_handler = {
	141	.prefix = XATTR_USER_PREFIX,
	142	.flags = F2FS_XATTR_INDEX_USER,
764a5c6b	143	.list = f2fs_xattr_user_list,
af48b85b JK	144	.get = f2fs_xattr_generic_get,
	145	.set = f2fs_xattr_generic_set,
	146	};
	147
	148	const struct xattr_handler f2fs_xattr_trusted_handler = {
	149	.prefix = XATTR_TRUSTED_PREFIX,
	150	.flags = F2FS_XATTR_INDEX_TRUSTED,
764a5c6b	151	.list = f2fs_xattr_trusted_list,
af48b85b JK	152	.get = f2fs_xattr_generic_get,
	153	.set = f2fs_xattr_generic_set,
	154	};
	155
573ea5fc	156	const struct xattr_handler f2fs_xattr_advise_handler = {
98e9cb57	157	.name = F2FS_SYSTEM_ADVISE_NAME,
573ea5fc	158	.flags = F2FS_XATTR_INDEX_ADVISE,
573ea5fc JK	159	.get = f2fs_xattr_advise_get,
	160	.set = f2fs_xattr_advise_set,
	161	};
	162
8ae8f162 JK	163	const struct xattr_handler f2fs_xattr_security_handler = {
	164	.prefix = XATTR_SECURITY_PREFIX,
	165	.flags = F2FS_XATTR_INDEX_SECURITY,
8ae8f162 JK	166	.get = f2fs_xattr_generic_get,
	167	.set = f2fs_xattr_generic_set,
	168	};
	169
af48b85b JK	170	static const struct xattr_handler *f2fs_xattr_handler_map[] = {
	171	[F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
	172	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	173	[F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
a6dda0e6 CH	174	[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
af48b85b JK	175	#endif
af48b85b JK	176	[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
8ae8f162 JK	177	#ifdef CONFIG_F2FS_FS_SECURITY
	178	[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
	179	#endif
af48b85b JK	180	[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
	181	};
	182
	183	const struct xattr_handler *f2fs_xattr_handlers[] = {
	184	&f2fs_xattr_user_handler,
	185	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	186	&posix_acl_access_xattr_handler,
a6dda0e6 CH	187	&posix_acl_default_xattr_handler,
af48b85b JK	188	#endif
af48b85b JK	189	&f2fs_xattr_trusted_handler,
8ae8f162 JK	190	#ifdef CONFIG_F2FS_FS_SECURITY
	191	&f2fs_xattr_security_handler,
	192	#endif
af48b85b JK	193	&f2fs_xattr_advise_handler,
	194	NULL,
	195	};
	196
e1123268	197	static inline const struct xattr_handler *f2fs_xattr_handler(int index)
af48b85b JK	198	{
	199	const struct xattr_handler *handler = NULL;
	200
e1123268 JK	201	if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
e1123268 JK	202	handler = f2fs_xattr_handler_map[index];
af48b85b JK	203	return handler;
	204	}
	205
e1123268 JK	206	static struct f2fs_xattr_entry __find_xattr(void base_addr, int index,
e1123268 JK	207	size_t len, const char *name)
dd9cfe23 JK	208	{
	209	struct f2fs_xattr_entry *entry;
	210
	211	list_for_each_xattr(entry, base_addr) {
e1123268	212	if (entry->e_name_index != index)
dd9cfe23	213	continue;
e1123268	214	if (entry->e_name_len != len)
dd9cfe23	215	continue;
e1123268	216	if (!memcmp(entry->e_name, name, len))
dd9cfe23 JK	217	break;
	218	}
	219	return entry;
	220	}
	221
65985d93 JK	222	static void read_all_xattrs(struct inode inode, struct page *ipage)
65985d93 JK	223	{
4081363f	224	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
65985d93 JK	225	struct f2fs_xattr_header *header;
	226	size_t size = PAGE_SIZE, inline_size = 0;
	227	void *txattr_addr;
	228
	229	inline_size = inline_xattr_size(inode);
	230
808a1d74	231	txattr_addr = kzalloc(inline_size + size, GFP_F2FS_ZERO);
65985d93 JK	232	if (!txattr_addr)
	233	return NULL;
	234
	235	/* read from inline xattr */
	236	if (inline_size) {
	237	struct page *page = NULL;
	238	void *inline_addr;
	239
	240	if (ipage) {
	241	inline_addr = inline_xattr_addr(ipage);
	242	} else {
	243	page = get_node_page(sbi, inode->i_ino);
	244	if (IS_ERR(page))
	245	goto fail;
	246	inline_addr = inline_xattr_addr(page);
	247	}
	248	memcpy(txattr_addr, inline_addr, inline_size);
	249	f2fs_put_page(page, 1);
	250	}
	251
	252	/* read from xattr node block */
	253	if (F2FS_I(inode)->i_xattr_nid) {
	254	struct page *xpage;
	255	void *xattr_addr;
	256
	257	/* The inode already has an extended attribute block. */
	258	xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
	259	if (IS_ERR(xpage))
	260	goto fail;
	261
	262	xattr_addr = page_address(xpage);
	263	memcpy(txattr_addr + inline_size, xattr_addr, PAGE_SIZE);
	264	f2fs_put_page(xpage, 1);
	265	}
	266
	267	header = XATTR_HDR(txattr_addr);
	268
	269	/* never been allocated xattrs */
	270	if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
	271	header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
	272	header->h_refcount = cpu_to_le32(1);
	273	}
	274	return txattr_addr;
	275	fail:
	276	kzfree(txattr_addr);
	277	return NULL;
	278	}
	279
	280	static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
	281	void txattr_addr, struct page ipage)
	282	{
4081363f	283	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
65985d93 JK	284	size_t inline_size = 0;
	285	void *xattr_addr;
	286	struct page *xpage;
	287	nid_t new_nid = 0;
	288	int err;
	289
	290	inline_size = inline_xattr_size(inode);
	291
	292	if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
	293	if (!alloc_nid(sbi, &new_nid))
	294	return -ENOSPC;
	295
	296	/* write to inline xattr */
	297	if (inline_size) {
	298	struct page *page = NULL;
	299	void *inline_addr;
	300
	301	if (ipage) {
	302	inline_addr = inline_xattr_addr(ipage);
fec1d657	303	f2fs_wait_on_page_writeback(ipage, NODE, true);
65985d93 JK	304	} else {
	305	page = get_node_page(sbi, inode->i_ino);
	306	if (IS_ERR(page)) {
	307	alloc_nid_failed(sbi, new_nid);
	308	return PTR_ERR(page);
	309	}
	310	inline_addr = inline_xattr_addr(page);
fec1d657	311	f2fs_wait_on_page_writeback(page, NODE, true);
65985d93 JK	312	}
	313	memcpy(inline_addr, txattr_addr, inline_size);
	314	f2fs_put_page(page, 1);
	315
	316	/* no need to use xattr node block */
	317	if (hsize <= inline_size) {
	318	err = truncate_xattr_node(inode, ipage);
	319	alloc_nid_failed(sbi, new_nid);
	320	return err;
	321	}
	322	}
	323
	324	/* write to xattr node block */
	325	if (F2FS_I(inode)->i_xattr_nid) {
	326	xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
	327	if (IS_ERR(xpage)) {
	328	alloc_nid_failed(sbi, new_nid);
	329	return PTR_ERR(xpage);
	330	}
9850cf4a	331	f2fs_bug_on(sbi, new_nid);
fec1d657	332	f2fs_wait_on_page_writeback(xpage, NODE, true);
65985d93 JK	333	} else {
	334	struct dnode_of_data dn;
	335	set_new_dnode(&dn, inode, NULL, NULL, new_nid);
	336	xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
	337	if (IS_ERR(xpage)) {
	338	alloc_nid_failed(sbi, new_nid);
	339	return PTR_ERR(xpage);
	340	}
	341	alloc_nid_done(sbi, new_nid);
	342	}
	343
	344	xattr_addr = page_address(xpage);
	345	memcpy(xattr_addr, txattr_addr + inline_size, PAGE_SIZE -
	346	sizeof(struct node_footer));
	347	set_page_dirty(xpage);
	348	f2fs_put_page(xpage, 1);
	349
	350	/* need to checkpoint during fsync */
	351	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
	352	return 0;
	353	}
	354
e1123268	355	int f2fs_getxattr(struct inode inode, int index, const char name,
bce8d112	356	void buffer, size_t buffer_size, struct page ipage)
af48b85b	357	{
af48b85b	358	struct f2fs_xattr_entry *entry;
65985d93	359	void *base_addr;
dd9cfe23	360	int error = 0;
e1123268	361	size_t size, len;
af48b85b JK	362
	363	if (name == NULL)
	364	return -EINVAL;
e1123268 JK	365
	366	len = strlen(name);
	367	if (len > F2FS_NAME_LEN)
6e452d69	368	return -ERANGE;
af48b85b	369
bce8d112	370	base_addr = read_all_xattrs(inode, ipage);
65985d93 JK	371	if (!base_addr)
65985d93 JK	372	return -ENOMEM;
af48b85b	373
e1123268	374	entry = __find_xattr(base_addr, index, len, name);
dd9cfe23	375	if (IS_XATTR_LAST_ENTRY(entry)) {
af48b85b JK	376	error = -ENODATA;
	377	goto cleanup;
	378	}
	379
e1123268	380	size = le16_to_cpu(entry->e_value_size);
af48b85b	381
e1123268	382	if (buffer && size > buffer_size) {
af48b85b JK	383	error = -ERANGE;
	384	goto cleanup;
	385	}
	386
	387	if (buffer) {
	388	char *pval = entry->e_name + entry->e_name_len;
e1123268	389	memcpy(buffer, pval, size);
af48b85b	390	}
e1123268	391	error = size;
af48b85b JK	392
af48b85b JK	393	cleanup:
65985d93	394	kzfree(base_addr);
af48b85b JK	395	return error;
	396	}
	397
	398	ssize_t f2fs_listxattr(struct dentry dentry, char buffer, size_t buffer_size)
	399	{
2b0143b5	400	struct inode *inode = d_inode(dentry);
af48b85b	401	struct f2fs_xattr_entry *entry;
af48b85b JK	402	void *base_addr;
	403	int error = 0;
	404	size_t rest = buffer_size;
	405
65985d93 JK	406	base_addr = read_all_xattrs(inode, NULL);
	407	if (!base_addr)
	408	return -ENOMEM;
af48b85b JK	409
	410	list_for_each_xattr(entry, base_addr) {
	411	const struct xattr_handler *handler =
	412	f2fs_xattr_handler(entry->e_name_index);
764a5c6b AG	413	const char *prefix;
764a5c6b AG	414	size_t prefix_len;
af48b85b JK	415	size_t size;
af48b85b JK	416
764a5c6b	417	if (!handler \|\| (handler->list && !handler->list(dentry)))
af48b85b JK	418	continue;
af48b85b JK	419
764a5c6b AG	420	prefix = handler->prefix ?: handler->name;
	421	prefix_len = strlen(prefix);
	422	size = prefix_len + entry->e_name_len + 1;
	423	if (buffer) {
	424	if (size > rest) {
	425	error = -ERANGE;
	426	goto cleanup;
	427	}
	428	memcpy(buffer, prefix, prefix_len);
	429	buffer += prefix_len;
	430	memcpy(buffer, entry->e_name, entry->e_name_len);
	431	buffer += entry->e_name_len;
	432	*buffer++ = 0;
af48b85b	433	}
af48b85b JK	434	rest -= size;
	435	}
	436	error = buffer_size - rest;
	437	cleanup:
65985d93	438	kzfree(base_addr);
af48b85b JK	439	return error;
	440	}
	441
e1123268 JK	442	static int __f2fs_setxattr(struct inode *inode, int index,
e1123268 JK	443	const char name, const void value, size_t size,
c02745ef	444	struct page *ipage, int flags)
af48b85b	445	{
af48b85b	446	struct f2fs_inode_info *fi = F2FS_I(inode);
af48b85b	447	struct f2fs_xattr_entry here, last;
af48b85b	448	void *base_addr;
65985d93	449	int found, newsize;
e1123268	450	size_t len;
65985d93 JK	451	__u32 new_hsize;
65985d93 JK	452	int error = -ENOMEM;
af48b85b JK	453
	454	if (name == NULL)
	455	return -EINVAL;
af48b85b JK	456
af48b85b JK	457	if (value == NULL)
e1123268	458	size = 0;
af48b85b	459
e1123268	460	len = strlen(name);
7c909772	461
037fe70c	462	if (len > F2FS_NAME_LEN)
af48b85b JK	463	return -ERANGE;
af48b85b JK	464
037fe70c CY	465	if (size > MAX_VALUE_LEN(inode))
	466	return -E2BIG;
	467
65985d93 JK	468	base_addr = read_all_xattrs(inode, ipage);
	469	if (!base_addr)
	470	goto exit;
af48b85b JK	471
af48b85b JK	472	/* find entry with wanted name. */
e1123268	473	here = __find_xattr(base_addr, index, len, name);
af48b85b	474
dd9cfe23	475	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
af48b85b	476
916decbf JK	477	if ((flags & XATTR_REPLACE) && !found) {
	478	error = -ENODATA;
	479	goto exit;
	480	} else if ((flags & XATTR_CREATE) && found) {
	481	error = -EEXIST;
	482	goto exit;
	483	}
	484
	485	last = here;
af48b85b JK	486	while (!IS_XATTR_LAST_ENTRY(last))
	487	last = XATTR_NEXT_ENTRY(last);
	488
e1123268	489	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
af48b85b JK	490
	491	/* 1. Check space */
	492	if (value) {
65985d93 JK	493	int free;
	494	/*
	495	* If value is NULL, it is remove operation.
e1c42045	496	* In case of update operation, we calculate free.
af48b85b	497	*/
65985d93	498	free = MIN_OFFSET(inode) - ((char )last - (char )base_addr);
af48b85b	499	if (found)
cc3de6a3	500	free = free + ENTRY_SIZE(here);
af48b85b	501
6bacf52f	502	if (unlikely(free < newsize)) {
af48b85b	503	error = -ENOSPC;
65985d93	504	goto exit;
af48b85b JK	505	}
	506	}
	507
	508	/* 2. Remove old entry */
	509	if (found) {
65985d93 JK	510	/*
65985d93 JK	511	* If entry is found, remove old entry.
af48b85b JK	512	* If not found, remove operation is not needed.
	513	*/
	514	struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
	515	int oldsize = ENTRY_SIZE(here);
	516
	517	memmove(here, next, (char )last - (char )next);
	518	last = (struct f2fs_xattr_entry )((char )last - oldsize);
	519	memset(last, 0, oldsize);
	520	}
	521
65985d93 JK	522	new_hsize = (char )last - (char )base_addr;
65985d93 JK	523
af48b85b JK	524	/* 3. Write new entry */
af48b85b JK	525	if (value) {
65985d93 JK	526	char *pval;
	527	/*
	528	* Before we come here, old entry is removed.
	529	* We just write new entry.
	530	*/
af48b85b	531	memset(last, 0, newsize);
e1123268 JK	532	last->e_name_index = index;
	533	last->e_name_len = len;
	534	memcpy(last->e_name, name, len);
	535	pval = last->e_name + len;
	536	memcpy(pval, value, size);
	537	last->e_value_size = cpu_to_le16(size);
65985d93	538	new_hsize += newsize;
af48b85b JK	539	}
af48b85b JK	540
65985d93 JK	541	error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
	542	if (error)
	543	goto exit;
af48b85b JK	544
	545	if (is_inode_flag_set(fi, FI_ACL_MODE)) {
	546	inode->i_mode = fi->i_acl_mode;
	547	inode->i_ctime = CURRENT_TIME;
	548	clear_inode_flag(fi, FI_ACL_MODE);
	549	}
f424f664 JK	550	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
	551	!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
	552	f2fs_set_encrypted_inode(inode);
e518ff81	553
8ae8f162 JK	554	if (ipage)
	555	update_inode(inode, ipage);
	556	else
	557	update_inode_page(inode);
7c909772	558	exit:
65985d93	559	kzfree(base_addr);
af48b85b JK	560	return error;
af48b85b JK	561	}
52ab9560	562
e1123268 JK	563	int f2fs_setxattr(struct inode inode, int index, const char name,
e1123268 JK	564	const void *value, size_t size,
c02745ef	565	struct page *ipage, int flags)
52ab9560	566	{
4081363f	567	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
52ab9560 RK	568	int err;
52ab9560 RK	569
d631abda JK	570	/* this case is only from init_inode_metadata */
	571	if (ipage)
	572	return __f2fs_setxattr(inode, index, name, value,
	573	size, ipage, flags);
2c4db1a6	574	f2fs_balance_fs(sbi, true);
52ab9560	575
e479556b	576	f2fs_lock_op(sbi);
d928bfbf JK	577	/* protect xattr_ver */
d928bfbf JK	578	down_write(&F2FS_I(inode)->i_sem);
c02745ef	579	err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
d928bfbf	580	up_write(&F2FS_I(inode)->i_sem);
e479556b	581	f2fs_unlock_op(sbi);
52ab9560	582
d0239e1b	583	f2fs_update_time(sbi, REQ_TIME);
52ab9560 RK	584	return err;
52ab9560 RK	585	}