[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(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	int total_len, prefix_len = 0;
	const char *prefix = NULL;

	switch (type) {
	case F2FS_XATTR_INDEX_USER:
		if (!test_opt(sbi, XATTR_USER))
			return -EOPNOTSUPP;
		prefix = XATTR_USER_PREFIX;
		prefix_len = XATTR_USER_PREFIX_LEN;
		break;
	case F2FS_XATTR_INDEX_TRUSTED:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		prefix = XATTR_TRUSTED_PREFIX;
		prefix_len = XATTR_TRUSTED_PREFIX_LEN;
		break;
	case F2FS_XATTR_INDEX_SECURITY:
		prefix = XATTR_SECURITY_PREFIX;
		prefix_len = XATTR_SECURITY_PREFIX_LEN;
		break;
	default:
		return -EINVAL;
	}

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

static int f2fs_xattr_generic_get(struct dentry *dentry, const char *name,
		void *buffer, size_t size, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);

	switch (type) {
	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(dentry->d_inode, type, name, buffer, size);
}

static int f2fs_xattr_generic_set(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);

	switch (type) {
	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(dentry->d_inode, type, name, value, size, NULL);
}

static size_t f2fs_xattr_advise_list(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
	size_t size;

	if (type != F2FS_XATTR_INDEX_ADVISE)
		return 0;

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

static int f2fs_xattr_advise_get(struct dentry *dentry, const char *name,
		void *buffer, size_t size, int type)
{
	struct inode *inode = dentry->d_inode;

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

	*((char *)buffer) = F2FS_I(inode)->i_advise;
	return sizeof(char);
}

static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct inode *inode = dentry->d_inode;

	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;
	return 0;
}

#ifdef CONFIG_F2FS_FS_SECURITY
static int __f2fs_setxattr(struct inode *inode, int name_index,
			const char *name, const void *value, size_t value_len,
			struct page *ipage);
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);
		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 name_index)
{
	const struct xattr_handler *handler = NULL;

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

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

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

static void *read_all_xattrs(struct inode *inode, struct page *ipage)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	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_SB(inode->i_sb);
	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);
		} 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);
		}
		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(new_nid);
	} 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 name_index, const char *name,
		void *buffer, size_t buffer_size)
{
	struct f2fs_xattr_entry *entry;
	void *base_addr;
	int error = 0;
	size_t value_len, name_len;

	if (name == NULL)
		return -EINVAL;
	name_len = strlen(name);
	if (name_len > F2FS_NAME_LEN)
		return -ERANGE;

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

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

	value_len = le16_to_cpu(entry->e_value_size);

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

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

cleanup:
	kzfree(base_addr);
	return error;
}

ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
	struct inode *inode = dentry->d_inode;
	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(dentry, buffer, rest, entry->e_name,
				entry->e_name_len, handler->flags);
		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 name_index,
			const char *name, const void *value, size_t value_len,
			struct page *ipage)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	struct f2fs_xattr_entry *here, *last;
	void *base_addr;
	int found, newsize;
	size_t name_len;
	__u32 new_hsize;
	int error = -ENOMEM;

	if (name == NULL)
		return -EINVAL;

	if (value == NULL)
		value_len = 0;

	name_len = strlen(name);

	if (name_len > F2FS_NAME_LEN || value_len > MAX_VALUE_LEN(inode))
		return -ERANGE;

	base_addr = read_all_xattrs(inode, ipage);
	if (!base_addr)
		goto exit;

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

	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
	last = here;

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

	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) +
			name_len + value_len);

	/* 1. Check space */
	if (value) {
		int free;
		/*
		 * If value is NULL, it is remove operation.
		 * In case of update operation, we caculate 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 = name_index;
		last->e_name_len = name_len;
		memcpy(last->e_name, name, name_len);
		pval = last->e_name + name_len;
		memcpy(pval, value, value_len);
		last->e_value_size = cpu_to_le16(value_len);
		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 (ipage)
		update_inode(inode, ipage);
	else
		update_inode_page(inode);
exit:
	kzfree(base_addr);
	return error;
}

int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
			const void *value, size_t value_len, struct page *ipage)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	int err;

	f2fs_balance_fs(sbi);

	f2fs_lock_op(sbi);
	/* protect xattr_ver */
	down_write(&F2FS_I(inode)->i_sem);
	err = __f2fs_setxattr(inode, name_index, name, value, value_len, ipage);
	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
	28	static size_t f2fs_xattr_generic_list(struct dentry dentry, char list,
	29	size_t list_size, const char *name, size_t name_len, int type)
	30	{
	31	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	32	int total_len, prefix_len = 0;
	33	const char *prefix = NULL;
	34
	35	switch (type) {
	36	case F2FS_XATTR_INDEX_USER:
	37	if (!test_opt(sbi, XATTR_USER))
	38	return -EOPNOTSUPP;
	39	prefix = XATTR_USER_PREFIX;
	40	prefix_len = XATTR_USER_PREFIX_LEN;
	41	break;
	42	case F2FS_XATTR_INDEX_TRUSTED:
	43	if (!capable(CAP_SYS_ADMIN))
	44	return -EPERM;
	45	prefix = XATTR_TRUSTED_PREFIX;
	46	prefix_len = XATTR_TRUSTED_PREFIX_LEN;
	47	break;
8ae8f162 JK	48	case F2FS_XATTR_INDEX_SECURITY:
	49	prefix = XATTR_SECURITY_PREFIX;
	50	prefix_len = XATTR_SECURITY_PREFIX_LEN;
	51	break;
af48b85b JK	52	default:
	53	return -EINVAL;
	54	}
	55
	56	total_len = prefix_len + name_len + 1;
	57	if (list && total_len <= list_size) {
	58	memcpy(list, prefix, prefix_len);
8ae8f162	59	memcpy(list + prefix_len, name, name_len);
af48b85b JK	60	list[prefix_len + name_len] = '\0';
	61	}
	62	return total_len;
	63	}
	64
	65	static int f2fs_xattr_generic_get(struct dentry dentry, const char name,
	66	void *buffer, size_t size, int type)
	67	{
	68	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	69
	70	switch (type) {
	71	case F2FS_XATTR_INDEX_USER:
	72	if (!test_opt(sbi, XATTR_USER))
	73	return -EOPNOTSUPP;
	74	break;
	75	case F2FS_XATTR_INDEX_TRUSTED:
	76	if (!capable(CAP_SYS_ADMIN))
	77	return -EPERM;
	78	break;
8ae8f162 JK	79	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162 JK	80	break;
af48b85b JK	81	default:
	82	return -EINVAL;
	83	}
	84	if (strcmp(name, "") == 0)
	85	return -EINVAL;
8ae8f162	86	return f2fs_getxattr(dentry->d_inode, type, name, buffer, size);
af48b85b JK	87	}
	88
	89	static int f2fs_xattr_generic_set(struct dentry dentry, const char name,
	90	const void *value, size_t size, int flags, int type)
	91	{
	92	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	93
	94	switch (type) {
	95	case F2FS_XATTR_INDEX_USER:
	96	if (!test_opt(sbi, XATTR_USER))
	97	return -EOPNOTSUPP;
	98	break;
	99	case F2FS_XATTR_INDEX_TRUSTED:
	100	if (!capable(CAP_SYS_ADMIN))
	101	return -EPERM;
	102	break;
8ae8f162 JK	103	case F2FS_XATTR_INDEX_SECURITY:
8ae8f162 JK	104	break;
af48b85b JK	105	default:
	106	return -EINVAL;
	107	}
	108	if (strcmp(name, "") == 0)
	109	return -EINVAL;
	110
8ae8f162	111	return f2fs_setxattr(dentry->d_inode, type, name, value, size, NULL);
af48b85b JK	112	}
af48b85b JK	113
573ea5fc JK	114	static size_t f2fs_xattr_advise_list(struct dentry dentry, char list,
	115	size_t list_size, const char *name, size_t name_len, int type)
	116	{
	117	const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
	118	size_t size;
	119
	120	if (type != F2FS_XATTR_INDEX_ADVISE)
	121	return 0;
	122
	123	size = strlen(xname) + 1;
	124	if (list && size <= list_size)
	125	memcpy(list, xname, size);
	126	return size;
	127	}
	128
	129	static int f2fs_xattr_advise_get(struct dentry dentry, const char name,
	130	void *buffer, size_t size, int type)
	131	{
	132	struct inode *inode = dentry->d_inode;
	133
	134	if (strcmp(name, "") != 0)
	135	return -EINVAL;
	136
	137	((char )buffer) = F2FS_I(inode)->i_advise;
	138	return sizeof(char);
	139	}
	140
	141	static int f2fs_xattr_advise_set(struct dentry dentry, const char name,
	142	const void *value, size_t size, int flags, int type)
	143	{
	144	struct inode *inode = dentry->d_inode;
	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;
	154	return 0;
	155	}
	156
8ae8f162	157	#ifdef CONFIG_F2FS_FS_SECURITY
52ab9560 RK	158	static int __f2fs_setxattr(struct inode *inode, int name_index,
	159	const char name, const void value, size_t value_len,
	160	struct page *ipage);
8ae8f162 JK	161	static int f2fs_initxattrs(struct inode inode, const struct xattr xattr_array,
	162	void *page)
	163	{
	164	const struct xattr *xattr;
	165	int err = 0;
	166
	167	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
52ab9560	168	err = __f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
8ae8f162 JK	169	xattr->name, xattr->value,
	170	xattr->value_len, (struct page *)page);
	171	if (err < 0)
	172	break;
	173	}
	174	return err;
	175	}
	176
	177	int f2fs_init_security(struct inode inode, struct inode dir,
	178	const struct qstr qstr, struct page ipage)
	179	{
	180	return security_inode_init_security(inode, dir, qstr,
	181	&f2fs_initxattrs, ipage);
	182	}
	183	#endif
	184
af48b85b JK	185	const struct xattr_handler f2fs_xattr_user_handler = {
	186	.prefix = XATTR_USER_PREFIX,
	187	.flags = F2FS_XATTR_INDEX_USER,
	188	.list = f2fs_xattr_generic_list,
	189	.get = f2fs_xattr_generic_get,
	190	.set = f2fs_xattr_generic_set,
	191	};
	192
	193	const struct xattr_handler f2fs_xattr_trusted_handler = {
	194	.prefix = XATTR_TRUSTED_PREFIX,
	195	.flags = F2FS_XATTR_INDEX_TRUSTED,
	196	.list = f2fs_xattr_generic_list,
	197	.get = f2fs_xattr_generic_get,
	198	.set = f2fs_xattr_generic_set,
	199	};
	200
573ea5fc JK	201	const struct xattr_handler f2fs_xattr_advise_handler = {
	202	.prefix = F2FS_SYSTEM_ADVISE_PREFIX,
	203	.flags = F2FS_XATTR_INDEX_ADVISE,
	204	.list = f2fs_xattr_advise_list,
	205	.get = f2fs_xattr_advise_get,
	206	.set = f2fs_xattr_advise_set,
	207	};
	208
8ae8f162 JK	209	const struct xattr_handler f2fs_xattr_security_handler = {
	210	.prefix = XATTR_SECURITY_PREFIX,
	211	.flags = F2FS_XATTR_INDEX_SECURITY,
	212	.list = f2fs_xattr_generic_list,
	213	.get = f2fs_xattr_generic_get,
	214	.set = f2fs_xattr_generic_set,
	215	};
	216
af48b85b JK	217	static const struct xattr_handler *f2fs_xattr_handler_map[] = {
	218	[F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
	219	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	220	[F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
a6dda0e6 CH	221	[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
af48b85b JK	222	#endif
af48b85b JK	223	[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
8ae8f162 JK	224	#ifdef CONFIG_F2FS_FS_SECURITY
	225	[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
	226	#endif
af48b85b JK	227	[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
	228	};
	229
	230	const struct xattr_handler *f2fs_xattr_handlers[] = {
	231	&f2fs_xattr_user_handler,
	232	#ifdef CONFIG_F2FS_FS_POSIX_ACL
a6dda0e6 CH	233	&posix_acl_access_xattr_handler,
a6dda0e6 CH	234	&posix_acl_default_xattr_handler,
af48b85b JK	235	#endif
af48b85b JK	236	&f2fs_xattr_trusted_handler,
8ae8f162 JK	237	#ifdef CONFIG_F2FS_FS_SECURITY
	238	&f2fs_xattr_security_handler,
	239	#endif
af48b85b JK	240	&f2fs_xattr_advise_handler,
	241	NULL,
	242	};
	243
	244	static inline const struct xattr_handler *f2fs_xattr_handler(int name_index)
	245	{
	246	const struct xattr_handler *handler = NULL;
	247
	248	if (name_index > 0 && name_index < ARRAY_SIZE(f2fs_xattr_handler_map))
	249	handler = f2fs_xattr_handler_map[name_index];
	250	return handler;
	251	}
	252
dd9cfe23 JK	253	static struct f2fs_xattr_entry __find_xattr(void base_addr, int name_index,
	254	size_t name_len, const char *name)
	255	{
	256	struct f2fs_xattr_entry *entry;
	257
	258	list_for_each_xattr(entry, base_addr) {
	259	if (entry->e_name_index != name_index)
	260	continue;
	261	if (entry->e_name_len != name_len)
	262	continue;
	263	if (!memcmp(entry->e_name, name, name_len))
	264	break;
	265	}
	266	return entry;
	267	}
	268
65985d93 JK	269	static void read_all_xattrs(struct inode inode, struct page *ipage)
	270	{
	271	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	272	struct f2fs_xattr_header *header;
	273	size_t size = PAGE_SIZE, inline_size = 0;
	274	void *txattr_addr;
	275
	276	inline_size = inline_xattr_size(inode);
	277
808a1d74	278	txattr_addr = kzalloc(inline_size + size, GFP_F2FS_ZERO);
65985d93 JK	279	if (!txattr_addr)
	280	return NULL;
	281
	282	/* read from inline xattr */
	283	if (inline_size) {
	284	struct page *page = NULL;
	285	void *inline_addr;
	286
	287	if (ipage) {
	288	inline_addr = inline_xattr_addr(ipage);
	289	} else {
	290	page = get_node_page(sbi, inode->i_ino);
	291	if (IS_ERR(page))
	292	goto fail;
	293	inline_addr = inline_xattr_addr(page);
	294	}
	295	memcpy(txattr_addr, inline_addr, inline_size);
	296	f2fs_put_page(page, 1);
	297	}
	298
	299	/* read from xattr node block */
	300	if (F2FS_I(inode)->i_xattr_nid) {
	301	struct page *xpage;
	302	void *xattr_addr;
	303
	304	/* The inode already has an extended attribute block. */
	305	xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
	306	if (IS_ERR(xpage))
	307	goto fail;
	308
	309	xattr_addr = page_address(xpage);
	310	memcpy(txattr_addr + inline_size, xattr_addr, PAGE_SIZE);
	311	f2fs_put_page(xpage, 1);
	312	}
	313
	314	header = XATTR_HDR(txattr_addr);
	315
	316	/* never been allocated xattrs */
	317	if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
	318	header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
	319	header->h_refcount = cpu_to_le32(1);
	320	}
	321	return txattr_addr;
	322	fail:
	323	kzfree(txattr_addr);
	324	return NULL;
	325	}
	326
	327	static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
	328	void txattr_addr, struct page ipage)
	329	{
	330	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	331	size_t inline_size = 0;
	332	void *xattr_addr;
	333	struct page *xpage;
	334	nid_t new_nid = 0;
	335	int err;
	336
	337	inline_size = inline_xattr_size(inode);
	338
	339	if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
	340	if (!alloc_nid(sbi, &new_nid))
	341	return -ENOSPC;
	342
343	/* write to inline xattr */
344	if (inline_size) {
345	struct page *page = NULL;
346	void *inline_addr;
347
348	if (ipage) {
349	inline_addr = inline_xattr_addr(ipage);
350	} else {
351	page = get_node_page(sbi, inode->i_ino);
352	if (IS_ERR(page)) {
353	alloc_nid_failed(sbi, new_nid);
354	return PTR_ERR(page);
355	}
356	inline_addr = inline_xattr_addr(page);
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	}
5d56b671	376	f2fs_bug_on(new_nid);
65985d93 JK	377	} else {
	378	struct dnode_of_data dn;
	379	set_new_dnode(&dn, inode, NULL, NULL, new_nid);
	380	xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
	381	if (IS_ERR(xpage)) {
	382	alloc_nid_failed(sbi, new_nid);
	383	return PTR_ERR(xpage);
	384	}
	385	alloc_nid_done(sbi, new_nid);
	386	}
	387
	388	xattr_addr = page_address(xpage);
	389	memcpy(xattr_addr, txattr_addr + inline_size, PAGE_SIZE -
	390	sizeof(struct node_footer));
	391	set_page_dirty(xpage);
	392	f2fs_put_page(xpage, 1);
	393
	394	/* need to checkpoint during fsync */
	395	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
	396	return 0;
	397	}
	398
af48b85b JK	399	int f2fs_getxattr(struct inode inode, int name_index, const char name,
	400	void *buffer, size_t buffer_size)
	401	{
af48b85b	402	struct f2fs_xattr_entry *entry;
65985d93	403	void *base_addr;
dd9cfe23	404	int error = 0;
9836b8b9	405	size_t value_len, name_len;
af48b85b JK	406
	407	if (name == NULL)
	408	return -EINVAL;
	409	name_len = strlen(name);
6e452d69 CY	410	if (name_len > F2FS_NAME_LEN)
6e452d69 CY	411	return -ERANGE;
af48b85b	412
65985d93 JK	413	base_addr = read_all_xattrs(inode, NULL);
	414	if (!base_addr)
	415	return -ENOMEM;
af48b85b	416
65985d93	417	entry = __find_xattr(base_addr, name_index, name_len, name);
dd9cfe23	418	if (IS_XATTR_LAST_ENTRY(entry)) {
af48b85b JK	419	error = -ENODATA;
	420	goto cleanup;
	421	}
	422
	423	value_len = le16_to_cpu(entry->e_value_size);
	424
	425	if (buffer && value_len > buffer_size) {
	426	error = -ERANGE;
	427	goto cleanup;
	428	}
	429
	430	if (buffer) {
	431	char *pval = entry->e_name + entry->e_name_len;
	432	memcpy(buffer, pval, value_len);
	433	}
	434	error = value_len;
	435
	436	cleanup:
65985d93	437	kzfree(base_addr);
af48b85b JK	438	return error;
	439	}
	440
	441	ssize_t f2fs_listxattr(struct dentry dentry, char buffer, size_t buffer_size)
	442	{
	443	struct inode *inode = dentry->d_inode;
af48b85b	444	struct f2fs_xattr_entry *entry;
af48b85b JK	445	void *base_addr;
	446	int error = 0;
	447	size_t rest = buffer_size;
	448
65985d93 JK	449	base_addr = read_all_xattrs(inode, NULL);
	450	if (!base_addr)
	451	return -ENOMEM;
af48b85b JK	452
	453	list_for_each_xattr(entry, base_addr) {
	454	const struct xattr_handler *handler =
	455	f2fs_xattr_handler(entry->e_name_index);
	456	size_t size;
	457
	458	if (!handler)
	459	continue;
	460
	461	size = handler->list(dentry, buffer, rest, entry->e_name,
	462	entry->e_name_len, handler->flags);
	463	if (buffer && size > rest) {
	464	error = -ERANGE;
	465	goto cleanup;
	466	}
	467
	468	if (buffer)
	469	buffer += size;
	470	rest -= size;
	471	}
	472	error = buffer_size - rest;
	473	cleanup:
65985d93	474	kzfree(base_addr);
af48b85b JK	475	return error;
	476	}
	477
52ab9560 RK	478	static int __f2fs_setxattr(struct inode *inode, int name_index,
	479	const char name, const void value, size_t value_len,
	480	struct page *ipage)
af48b85b	481	{
af48b85b	482	struct f2fs_inode_info *fi = F2FS_I(inode);
af48b85b	483	struct f2fs_xattr_entry here, last;
af48b85b	484	void *base_addr;
65985d93	485	int found, newsize;
9836b8b9	486	size_t name_len;
65985d93 JK	487	__u32 new_hsize;
65985d93 JK	488	int error = -ENOMEM;
af48b85b JK	489
	490	if (name == NULL)
	491	return -EINVAL;
af48b85b JK	492
	493	if (value == NULL)
	494	value_len = 0;
	495
7c909772 NJ	496	name_len = strlen(name);
7c909772 NJ	497
65985d93	498	if (name_len > F2FS_NAME_LEN \|\| value_len > MAX_VALUE_LEN(inode))
af48b85b JK	499	return -ERANGE;
af48b85b JK	500
65985d93 JK	501	base_addr = read_all_xattrs(inode, ipage);
	502	if (!base_addr)
	503	goto exit;
af48b85b JK	504
af48b85b JK	505	/* find entry with wanted name. */
dd9cfe23	506	here = __find_xattr(base_addr, name_index, name_len, name);
af48b85b	507
dd9cfe23	508	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
af48b85b JK	509	last = here;
	510
	511	while (!IS_XATTR_LAST_ENTRY(last))
	512	last = XATTR_NEXT_ENTRY(last);
	513
	514	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) +
	515	name_len + value_len);
	516
	517	/* 1. Check space */
	518	if (value) {
65985d93 JK	519	int free;
	520	/*
	521	* If value is NULL, it is remove operation.
af48b85b JK	522	* In case of update operation, we caculate free.
af48b85b JK	523	*/
65985d93	524	free = MIN_OFFSET(inode) - ((char )last - (char )base_addr);
af48b85b	525	if (found)
cc3de6a3	526	free = free + ENTRY_SIZE(here);
af48b85b	527
6bacf52f	528	if (unlikely(free < newsize)) {
af48b85b	529	error = -ENOSPC;
65985d93	530	goto exit;
af48b85b JK	531	}
	532	}
	533
	534	/* 2. Remove old entry */
	535	if (found) {
65985d93 JK	536	/*
65985d93 JK	537	* If entry is found, remove old entry.
af48b85b JK	538	* If not found, remove operation is not needed.
	539	*/
	540	struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
	541	int oldsize = ENTRY_SIZE(here);
	542
	543	memmove(here, next, (char )last - (char )next);
	544	last = (struct f2fs_xattr_entry )((char )last - oldsize);
	545	memset(last, 0, oldsize);
	546	}
	547
65985d93 JK	548	new_hsize = (char )last - (char )base_addr;
65985d93 JK	549
af48b85b JK	550	/* 3. Write new entry */
af48b85b JK	551	if (value) {
65985d93 JK	552	char *pval;
	553	/*
	554	* Before we come here, old entry is removed.
	555	* We just write new entry.
	556	*/
af48b85b JK	557	memset(last, 0, newsize);
	558	last->e_name_index = name_index;
	559	last->e_name_len = name_len;
	560	memcpy(last->e_name, name, name_len);
	561	pval = last->e_name + name_len;
	562	memcpy(pval, value, value_len);
	563	last->e_value_size = cpu_to_le16(value_len);
65985d93	564	new_hsize += newsize;
af48b85b JK	565	}
af48b85b JK	566
65985d93 JK	567	error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
	568	if (error)
	569	goto exit;
af48b85b JK	570
	571	if (is_inode_flag_set(fi, FI_ACL_MODE)) {
	572	inode->i_mode = fi->i_acl_mode;
	573	inode->i_ctime = CURRENT_TIME;
	574	clear_inode_flag(fi, FI_ACL_MODE);
	575	}
e518ff81	576
8ae8f162 JK	577	if (ipage)
	578	update_inode(inode, ipage);
	579	else
	580	update_inode_page(inode);
7c909772	581	exit:
65985d93	582	kzfree(base_addr);
af48b85b JK	583	return error;
af48b85b JK	584	}
52ab9560 RK	585
	586	int f2fs_setxattr(struct inode inode, int name_index, const char name,
	587	const void value, size_t value_len, struct page ipage)
	588	{
	589	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
52ab9560 RK	590	int err;
	591
	592	f2fs_balance_fs(sbi);
	593
e479556b	594	f2fs_lock_op(sbi);
d928bfbf JK	595	/* protect xattr_ver */
d928bfbf JK	596	down_write(&F2FS_I(inode)->i_sem);
52ab9560	597	err = __f2fs_setxattr(inode, name_index, name, value, value_len, ipage);
d928bfbf	598	up_write(&F2FS_I(inode)->i_sem);
e479556b	599	f2fs_unlock_op(sbi);
52ab9560 RK	600
	601	return err;
	602	}