[mirror_ubuntu-artful-kernel.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 size_t f2fs_xattr_generic_list(const struct xattr_handler *handler,
		struct dentry *dentry, char *list, size_t list_size,
		const char *name, size_t len)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	int total_len, prefix_len;

	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;
	}

	prefix_len = strlen(handler->prefix);
	total_len = prefix_len + len + 1;
	if (list && total_len <= list_size) {
		memcpy(list, handler->prefix, prefix_len);
		memcpy(list + prefix_len, name, len);
		list[prefix_len + len] = '\0';
	}
	return total_len;
}

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;
	}
	if (strcmp(name, "") == 0)
		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;
	}
	if (strcmp(name, "") == 0)
		return -EINVAL;

	return f2fs_setxattr(d_inode(dentry), handler->flags, name,
					value, size, NULL, flags);
}

static size_t f2fs_xattr_advise_list(const struct xattr_handler *handler,
		struct dentry *dentry, char *list, size_t list_size,
		const char *name, size_t len)
{
	const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
	size_t size;

	size = strlen(xname) + 1;
	if (list && size <= list_size)
		memcpy(list, xname, size);
	return size;
}

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 (strcmp(name, "") != 0)
		return -EINVAL;

	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 (strcmp(name, "") != 0)
		return -EINVAL;
	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_generic_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_generic_list,
	.get	= f2fs_xattr_generic_get,
	.set	= f2fs_xattr_generic_set,
};

const struct xattr_handler f2fs_xattr_advise_handler = {
	.prefix = F2FS_SYSTEM_ADVISE_PREFIX,
	.flags	= F2FS_XATTR_INDEX_ADVISE,
	.list   = f2fs_xattr_advise_list,
	.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,
	.list	= f2fs_xattr_generic_list,
	.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);
		} 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);
		}
		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);
	} 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);
		size_t size;

		if (!handler)
			continue;

		size = handler->list(handler, dentry, buffer, rest,
				     entry->e_name, entry->e_name_len);
		if (buffer && size > rest) {
			error = -ERANGE;
			goto cleanup;
		}

		if (buffer)
			buffer += size;
		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);

	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);

	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 size_t f2fs_xattr_generic_list(const struct xattr_handler *handler,
	29	struct dentry dentry, char list, size_t list_size,
	30	const char *name, size_t len)
af48b85b JK	31	{
af48b85b JK	32	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
29608d20	33	int total_len, prefix_len;
af48b85b	34
d9a82a04	35	switch (handler->flags) {
af48b85b JK	36	case F2FS_XATTR_INDEX_USER:
	37	if (!test_opt(sbi, XATTR_USER))
	38	return -EOPNOTSUPP;
af48b85b JK	39	break;
	40	case F2FS_XATTR_INDEX_TRUSTED:
	41	if (!capable(CAP_SYS_ADMIN))
	42	return -EPERM;
af48b85b	43	break;
8ae8f162	44	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162	45	break;
af48b85b JK	46	default:
	47	return -EINVAL;
	48	}
	49
29608d20	50	prefix_len = strlen(handler->prefix);
e1123268	51	total_len = prefix_len + len + 1;
af48b85b	52	if (list && total_len <= list_size) {
29608d20	53	memcpy(list, handler->prefix, prefix_len);
e1123268 JK	54	memcpy(list + prefix_len, name, len);
e1123268 JK	55	list[prefix_len + len] = '\0';
af48b85b JK	56	}
	57	return total_len;
	58	}
	59
d9a82a04 AG	60	static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
	61	struct dentry dentry, const char name, void *buffer,
	62	size_t size)
af48b85b JK	63	{
	64	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	65
d9a82a04	66	switch (handler->flags) {
af48b85b JK	67	case F2FS_XATTR_INDEX_USER:
	68	if (!test_opt(sbi, XATTR_USER))
	69	return -EOPNOTSUPP;
	70	break;
	71	case F2FS_XATTR_INDEX_TRUSTED:
	72	if (!capable(CAP_SYS_ADMIN))
	73	return -EPERM;
	74	break;
8ae8f162 JK	75	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162 JK	76	break;
af48b85b JK	77	default:
	78	return -EINVAL;
	79	}
	80	if (strcmp(name, "") == 0)
	81	return -EINVAL;
d9a82a04 AG	82	return f2fs_getxattr(d_inode(dentry), handler->flags, name,
d9a82a04 AG	83	buffer, size, NULL);
af48b85b JK	84	}
af48b85b JK	85
d9a82a04 AG	86	static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
	87	struct dentry dentry, const char name, const void *value,
	88	size_t size, int flags)
af48b85b JK	89	{
	90	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	91
d9a82a04	92	switch (handler->flags) {
af48b85b JK	93	case F2FS_XATTR_INDEX_USER:
	94	if (!test_opt(sbi, XATTR_USER))
	95	return -EOPNOTSUPP;
	96	break;
	97	case F2FS_XATTR_INDEX_TRUSTED:
	98	if (!capable(CAP_SYS_ADMIN))
	99	return -EPERM;
	100	break;
8ae8f162 JK	101	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162 JK	102	break;
af48b85b JK	103	default:
	104	return -EINVAL;
	105	}
	106	if (strcmp(name, "") == 0)
	107	return -EINVAL;
	108
d9a82a04	109	return f2fs_setxattr(d_inode(dentry), handler->flags, name,
c02745ef	110	value, size, NULL, flags);
af48b85b JK	111	}
af48b85b JK	112
d9a82a04 AG	113	static size_t f2fs_xattr_advise_list(const struct xattr_handler *handler,
	114	struct dentry dentry, char list, size_t list_size,
	115	const char *name, size_t len)
573ea5fc JK	116	{
	117	const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
	118	size_t size;
	119
573ea5fc JK	120	size = strlen(xname) + 1;
	121	if (list && size <= list_size)
	122	memcpy(list, xname, size);
	123	return size;
	124	}
	125
d9a82a04 AG	126	static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
	127	struct dentry dentry, const char name, void *buffer,
	128	size_t size)
573ea5fc	129	{
2b0143b5	130	struct inode *inode = d_inode(dentry);
573ea5fc JK	131
	132	if (strcmp(name, "") != 0)
	133	return -EINVAL;
	134
84e97c27 CY	135	if (buffer)
84e97c27 CY	136	((char )buffer) = F2FS_I(inode)->i_advise;
573ea5fc JK	137	return sizeof(char);
	138	}
	139
d9a82a04 AG	140	static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
	141	struct dentry dentry, const char name, const void *value,
	142	size_t size, int flags)
573ea5fc	143	{
2b0143b5	144	struct inode *inode = d_inode(dentry);
573ea5fc JK	145
	146	if (strcmp(name, "") != 0)
	147	return -EINVAL;
	148	if (!inode_owner_or_capable(inode))
	149	return -EPERM;
	150	if (value == NULL)
	151	return -EINVAL;
	152
	153	F2FS_I(inode)->i_advise \|= (char )value;
30c62fdb	154	mark_inode_dirty(inode);
573ea5fc JK	155	return 0;
	156	}
	157
8ae8f162 JK	158	#ifdef CONFIG_F2FS_FS_SECURITY
	159	static int f2fs_initxattrs(struct inode inode, const struct xattr xattr_array,
	160	void *page)
	161	{
	162	const struct xattr *xattr;
	163	int err = 0;
	164
	165	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
d631abda	166	err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
8ae8f162	167	xattr->name, xattr->value,
c02745ef	168	xattr->value_len, (struct page *)page, 0);
8ae8f162 JK	169	if (err < 0)
	170	break;
	171	}
	172	return err;
	173	}
	174
	175	int f2fs_init_security(struct inode inode, struct inode dir,
	176	const struct qstr qstr, struct page ipage)
	177	{
	178	return security_inode_init_security(inode, dir, qstr,
	179	&f2fs_initxattrs, ipage);
	180	}
	181	#endif
	182
af48b85b JK	183	const struct xattr_handler f2fs_xattr_user_handler = {
	184	.prefix = XATTR_USER_PREFIX,
	185	.flags = F2FS_XATTR_INDEX_USER,
	186	.list = f2fs_xattr_generic_list,
	187	.get = f2fs_xattr_generic_get,
	188	.set = f2fs_xattr_generic_set,
	189	};
	190
	191	const struct xattr_handler f2fs_xattr_trusted_handler = {
	192	.prefix = XATTR_TRUSTED_PREFIX,
	193	.flags = F2FS_XATTR_INDEX_TRUSTED,
	194	.list = f2fs_xattr_generic_list,
	195	.get = f2fs_xattr_generic_get,
	196	.set = f2fs_xattr_generic_set,
	197	};
	198
573ea5fc JK	199	const struct xattr_handler f2fs_xattr_advise_handler = {
	200	.prefix = F2FS_SYSTEM_ADVISE_PREFIX,
	201	.flags = F2FS_XATTR_INDEX_ADVISE,
	202	.list = f2fs_xattr_advise_list,
	203	.get = f2fs_xattr_advise_get,
	204	.set = f2fs_xattr_advise_set,
	205	};
	206
8ae8f162 JK	207	const struct xattr_handler f2fs_xattr_security_handler = {
	208	.prefix = XATTR_SECURITY_PREFIX,
	209	.flags = F2FS_XATTR_INDEX_SECURITY,
	210	.list = f2fs_xattr_generic_list,
	211	.get = f2fs_xattr_generic_get,
	212	.set = f2fs_xattr_generic_set,
	213	};
	214
af48b85b JK	215	static const struct xattr_handler *f2fs_xattr_handler_map[] = {
	216	[F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
	217	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	218	[F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
a6dda0e6 CH	219	[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
af48b85b JK	220	#endif
af48b85b JK	221	[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
8ae8f162 JK	222	#ifdef CONFIG_F2FS_FS_SECURITY
	223	[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
	224	#endif
af48b85b JK	225	[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
	226	};
	227
	228	const struct xattr_handler *f2fs_xattr_handlers[] = {
	229	&f2fs_xattr_user_handler,
	230	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	231	&posix_acl_access_xattr_handler,
a6dda0e6 CH	232	&posix_acl_default_xattr_handler,
af48b85b JK	233	#endif
af48b85b JK	234	&f2fs_xattr_trusted_handler,
8ae8f162 JK	235	#ifdef CONFIG_F2FS_FS_SECURITY
	236	&f2fs_xattr_security_handler,
	237	#endif
af48b85b JK	238	&f2fs_xattr_advise_handler,
	239	NULL,
	240	};
	241
e1123268	242	static inline const struct xattr_handler *f2fs_xattr_handler(int index)
af48b85b JK	243	{
	244	const struct xattr_handler *handler = NULL;
	245
e1123268 JK	246	if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
e1123268 JK	247	handler = f2fs_xattr_handler_map[index];
af48b85b JK	248	return handler;
	249	}
	250
e1123268 JK	251	static struct f2fs_xattr_entry __find_xattr(void base_addr, int index,
e1123268 JK	252	size_t len, const char *name)
dd9cfe23 JK	253	{
	254	struct f2fs_xattr_entry *entry;
	255
	256	list_for_each_xattr(entry, base_addr) {
e1123268	257	if (entry->e_name_index != index)
dd9cfe23	258	continue;
e1123268	259	if (entry->e_name_len != len)
dd9cfe23	260	continue;
e1123268	261	if (!memcmp(entry->e_name, name, len))
dd9cfe23 JK	262	break;
	263	}
	264	return entry;
	265	}
	266
65985d93 JK	267	static void read_all_xattrs(struct inode inode, struct page *ipage)
65985d93 JK	268	{
4081363f	269	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
65985d93 JK	270	struct f2fs_xattr_header *header;
	271	size_t size = PAGE_SIZE, inline_size = 0;
	272	void *txattr_addr;
	273
	274	inline_size = inline_xattr_size(inode);
	275
808a1d74	276	txattr_addr = kzalloc(inline_size + size, GFP_F2FS_ZERO);
65985d93 JK	277	if (!txattr_addr)
	278	return NULL;
	279
	280	/* read from inline xattr */
	281	if (inline_size) {
	282	struct page *page = NULL;
	283	void *inline_addr;
	284
	285	if (ipage) {
	286	inline_addr = inline_xattr_addr(ipage);
	287	} else {
	288	page = get_node_page(sbi, inode->i_ino);
	289	if (IS_ERR(page))
	290	goto fail;
	291	inline_addr = inline_xattr_addr(page);
	292	}
	293	memcpy(txattr_addr, inline_addr, inline_size);
	294	f2fs_put_page(page, 1);
	295	}
	296
	297	/* read from xattr node block */
	298	if (F2FS_I(inode)->i_xattr_nid) {
	299	struct page *xpage;
	300	void *xattr_addr;
	301
	302	/* The inode already has an extended attribute block. */
	303	xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
	304	if (IS_ERR(xpage))
	305	goto fail;
	306
	307	xattr_addr = page_address(xpage);
	308	memcpy(txattr_addr + inline_size, xattr_addr, PAGE_SIZE);
	309	f2fs_put_page(xpage, 1);
	310	}
	311
	312	header = XATTR_HDR(txattr_addr);
	313
	314	/* never been allocated xattrs */
	315	if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
	316	header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
	317	header->h_refcount = cpu_to_le32(1);
	318	}
	319	return txattr_addr;
	320	fail:
	321	kzfree(txattr_addr);
	322	return NULL;
	323	}
	324
	325	static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
	326	void txattr_addr, struct page ipage)
	327	{
4081363f	328	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
65985d93 JK	329	size_t inline_size = 0;
	330	void *xattr_addr;
	331	struct page *xpage;
	332	nid_t new_nid = 0;
	333	int err;
	334
	335	inline_size = inline_xattr_size(inode);
	336
	337	if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
	338	if (!alloc_nid(sbi, &new_nid))
	339	return -ENOSPC;
	340
	341	/* write to inline xattr */
	342	if (inline_size) {
	343	struct page *page = NULL;
	344	void *inline_addr;
	345
	346	if (ipage) {
	347	inline_addr = inline_xattr_addr(ipage);
54b591df	348	f2fs_wait_on_page_writeback(ipage, NODE);
65985d93 JK	349	} else {
	350	page = get_node_page(sbi, inode->i_ino);
	351	if (IS_ERR(page)) {
	352	alloc_nid_failed(sbi, new_nid);
	353	return PTR_ERR(page);
	354	}
	355	inline_addr = inline_xattr_addr(page);
54b591df	356	f2fs_wait_on_page_writeback(page, NODE);
65985d93 JK	357	}
	358	memcpy(inline_addr, txattr_addr, inline_size);
	359	f2fs_put_page(page, 1);
	360
	361	/* no need to use xattr node block */
	362	if (hsize <= inline_size) {
	363	err = truncate_xattr_node(inode, ipage);
	364	alloc_nid_failed(sbi, new_nid);
	365	return err;
	366	}
	367	}
	368
	369	/* write to xattr node block */
	370	if (F2FS_I(inode)->i_xattr_nid) {
	371	xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
	372	if (IS_ERR(xpage)) {
	373	alloc_nid_failed(sbi, new_nid);
	374	return PTR_ERR(xpage);
	375	}
9850cf4a	376	f2fs_bug_on(sbi, new_nid);
54b591df	377	f2fs_wait_on_page_writeback(xpage, NODE);
65985d93 JK	378	} else {
	379	struct dnode_of_data dn;
	380	set_new_dnode(&dn, inode, NULL, NULL, new_nid);
	381	xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
	382	if (IS_ERR(xpage)) {
	383	alloc_nid_failed(sbi, new_nid);
	384	return PTR_ERR(xpage);
	385	}
	386	alloc_nid_done(sbi, new_nid);
	387	}
	388
	389	xattr_addr = page_address(xpage);
	390	memcpy(xattr_addr, txattr_addr + inline_size, PAGE_SIZE -
	391	sizeof(struct node_footer));
	392	set_page_dirty(xpage);
	393	f2fs_put_page(xpage, 1);
	394
	395	/* need to checkpoint during fsync */
	396	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
	397	return 0;
	398	}
	399
e1123268	400	int f2fs_getxattr(struct inode inode, int index, const char name,
bce8d112	401	void buffer, size_t buffer_size, struct page ipage)
af48b85b	402	{
af48b85b	403	struct f2fs_xattr_entry *entry;
65985d93	404	void *base_addr;
dd9cfe23	405	int error = 0;
e1123268	406	size_t size, len;
af48b85b JK	407
	408	if (name == NULL)
	409	return -EINVAL;
e1123268 JK	410
	411	len = strlen(name);
	412	if (len > F2FS_NAME_LEN)
6e452d69	413	return -ERANGE;
af48b85b	414
bce8d112	415	base_addr = read_all_xattrs(inode, ipage);
65985d93 JK	416	if (!base_addr)
65985d93 JK	417	return -ENOMEM;
af48b85b	418
e1123268	419	entry = __find_xattr(base_addr, index, len, name);
dd9cfe23	420	if (IS_XATTR_LAST_ENTRY(entry)) {
af48b85b JK	421	error = -ENODATA;
	422	goto cleanup;
	423	}
	424
e1123268	425	size = le16_to_cpu(entry->e_value_size);
af48b85b	426
e1123268	427	if (buffer && size > buffer_size) {
af48b85b JK	428	error = -ERANGE;
	429	goto cleanup;
	430	}
	431
	432	if (buffer) {
	433	char *pval = entry->e_name + entry->e_name_len;
e1123268	434	memcpy(buffer, pval, size);
af48b85b	435	}
e1123268	436	error = size;
af48b85b JK	437
af48b85b JK	438	cleanup:
65985d93	439	kzfree(base_addr);
af48b85b JK	440	return error;
	441	}
	442
	443	ssize_t f2fs_listxattr(struct dentry dentry, char buffer, size_t buffer_size)
	444	{
2b0143b5	445	struct inode *inode = d_inode(dentry);
af48b85b	446	struct f2fs_xattr_entry *entry;
af48b85b JK	447	void *base_addr;
	448	int error = 0;
	449	size_t rest = buffer_size;
	450
65985d93 JK	451	base_addr = read_all_xattrs(inode, NULL);
	452	if (!base_addr)
	453	return -ENOMEM;
af48b85b JK	454
	455	list_for_each_xattr(entry, base_addr) {
	456	const struct xattr_handler *handler =
	457	f2fs_xattr_handler(entry->e_name_index);
	458	size_t size;
	459
	460	if (!handler)
	461	continue;
	462
d9a82a04 AG	463	size = handler->list(handler, dentry, buffer, rest,
d9a82a04 AG	464	entry->e_name, entry->e_name_len);
af48b85b JK	465	if (buffer && size > rest) {
	466	error = -ERANGE;
	467	goto cleanup;
	468	}
	469
	470	if (buffer)
	471	buffer += size;
	472	rest -= size;
	473	}
	474	error = buffer_size - rest;
	475	cleanup:
65985d93	476	kzfree(base_addr);
af48b85b JK	477	return error;
	478	}
	479
e1123268 JK	480	static int __f2fs_setxattr(struct inode *inode, int index,
e1123268 JK	481	const char name, const void value, size_t size,
c02745ef	482	struct page *ipage, int flags)
af48b85b	483	{
af48b85b	484	struct f2fs_inode_info *fi = F2FS_I(inode);
af48b85b	485	struct f2fs_xattr_entry here, last;
af48b85b	486	void *base_addr;
65985d93	487	int found, newsize;
e1123268	488	size_t len;
65985d93 JK	489	__u32 new_hsize;
65985d93 JK	490	int error = -ENOMEM;
af48b85b JK	491
	492	if (name == NULL)
	493	return -EINVAL;
af48b85b JK	494
af48b85b JK	495	if (value == NULL)
e1123268	496	size = 0;
af48b85b	497
e1123268	498	len = strlen(name);
7c909772	499
037fe70c	500	if (len > F2FS_NAME_LEN)
af48b85b JK	501	return -ERANGE;
af48b85b JK	502
037fe70c CY	503	if (size > MAX_VALUE_LEN(inode))
	504	return -E2BIG;
	505
65985d93 JK	506	base_addr = read_all_xattrs(inode, ipage);
	507	if (!base_addr)
	508	goto exit;
af48b85b JK	509
af48b85b JK	510	/* find entry with wanted name. */
e1123268	511	here = __find_xattr(base_addr, index, len, name);
af48b85b	512
dd9cfe23	513	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
af48b85b	514
916decbf JK	515	if ((flags & XATTR_REPLACE) && !found) {
	516	error = -ENODATA;
	517	goto exit;
	518	} else if ((flags & XATTR_CREATE) && found) {
	519	error = -EEXIST;
	520	goto exit;
	521	}
	522
	523	last = here;
af48b85b JK	524	while (!IS_XATTR_LAST_ENTRY(last))
	525	last = XATTR_NEXT_ENTRY(last);
	526
e1123268	527	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
af48b85b JK	528
	529	/* 1. Check space */
	530	if (value) {
65985d93 JK	531	int free;
	532	/*
	533	* If value is NULL, it is remove operation.
e1c42045	534	* In case of update operation, we calculate free.
af48b85b	535	*/
65985d93	536	free = MIN_OFFSET(inode) - ((char )last - (char )base_addr);
af48b85b	537	if (found)
cc3de6a3	538	free = free + ENTRY_SIZE(here);
af48b85b	539
6bacf52f	540	if (unlikely(free < newsize)) {
af48b85b	541	error = -ENOSPC;
65985d93	542	goto exit;
af48b85b JK	543	}
	544	}
	545
	546	/* 2. Remove old entry */
	547	if (found) {
65985d93 JK	548	/*
65985d93 JK	549	* If entry is found, remove old entry.
af48b85b JK	550	* If not found, remove operation is not needed.
	551	*/
	552	struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
	553	int oldsize = ENTRY_SIZE(here);
	554
	555	memmove(here, next, (char )last - (char )next);
	556	last = (struct f2fs_xattr_entry )((char )last - oldsize);
	557	memset(last, 0, oldsize);
	558	}
	559
65985d93 JK	560	new_hsize = (char )last - (char )base_addr;
65985d93 JK	561
af48b85b JK	562	/* 3. Write new entry */
af48b85b JK	563	if (value) {
65985d93 JK	564	char *pval;
	565	/*
	566	* Before we come here, old entry is removed.
	567	* We just write new entry.
	568	*/
af48b85b	569	memset(last, 0, newsize);
e1123268 JK	570	last->e_name_index = index;
	571	last->e_name_len = len;
	572	memcpy(last->e_name, name, len);
	573	pval = last->e_name + len;
	574	memcpy(pval, value, size);
	575	last->e_value_size = cpu_to_le16(size);
65985d93	576	new_hsize += newsize;
af48b85b JK	577	}
af48b85b JK	578
65985d93 JK	579	error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
	580	if (error)
	581	goto exit;
af48b85b JK	582
	583	if (is_inode_flag_set(fi, FI_ACL_MODE)) {
	584	inode->i_mode = fi->i_acl_mode;
	585	inode->i_ctime = CURRENT_TIME;
	586	clear_inode_flag(fi, FI_ACL_MODE);
	587	}
f424f664 JK	588	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
	589	!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
	590	f2fs_set_encrypted_inode(inode);
e518ff81	591
8ae8f162 JK	592	if (ipage)
	593	update_inode(inode, ipage);
	594	else
	595	update_inode_page(inode);
7c909772	596	exit:
65985d93	597	kzfree(base_addr);
af48b85b JK	598	return error;
af48b85b JK	599	}
52ab9560	600
e1123268 JK	601	int f2fs_setxattr(struct inode inode, int index, const char name,
e1123268 JK	602	const void *value, size_t size,
c02745ef	603	struct page *ipage, int flags)
52ab9560	604	{
4081363f	605	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
52ab9560 RK	606	int err;
52ab9560 RK	607
d631abda JK	608	/* this case is only from init_inode_metadata */
	609	if (ipage)
	610	return __f2fs_setxattr(inode, index, name, value,
	611	size, ipage, flags);
52ab9560 RK	612	f2fs_balance_fs(sbi);
52ab9560 RK	613
e479556b	614	f2fs_lock_op(sbi);
d928bfbf JK	615	/* protect xattr_ver */
d928bfbf JK	616	down_write(&F2FS_I(inode)->i_sem);
c02745ef	617	err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
d928bfbf	618	up_write(&F2FS_I(inode)->i_sem);
e479556b	619	f2fs_unlock_op(sbi);
52ab9560 RK	620
	621	return err;
	622	}