[thirdparty/kernel/stable.git] / fs / btrfs / props.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
 */

#include <linux/hashtable.h>
#include "props.h"
#include "btrfs_inode.h"
#include "transaction.h"
#include "ctree.h"
#include "xattr.h"
#include "compression.h"

#define BTRFS_PROP_HANDLERS_HT_BITS 8
static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS);

struct prop_handler {
	struct hlist_node node;
	const char *xattr_name;
	int (*validate)(const char *value, size_t len);
	int (*apply)(struct inode *inode, const char *value, size_t len);
	const char *(*extract)(struct inode *inode);
	int inheritable;
};

static int prop_compression_validate(const char *value, size_t len);
static int prop_compression_apply(struct inode *inode,
				  const char *value,
				  size_t len);
static const char *prop_compression_extract(struct inode *inode);

static struct prop_handler prop_handlers[] = {
	{
		.xattr_name = XATTR_BTRFS_PREFIX "compression",
		.validate = prop_compression_validate,
		.apply = prop_compression_apply,
		.extract = prop_compression_extract,
		.inheritable = 1
	},
};

void __init btrfs_props_init(void)
{
	int i;

	hash_init(prop_handlers_ht);

	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
		struct prop_handler *p = &prop_handlers[i];
		u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));

		hash_add(prop_handlers_ht, &p->node, h);
	}
}

static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash)
{
	struct hlist_head *h;

	h = &prop_handlers_ht[hash_min(hash, BTRFS_PROP_HANDLERS_HT_BITS)];
	if (hlist_empty(h))
		return NULL;

	return h;
}

static const struct prop_handler *
find_prop_handler(const char *name,
		  const struct hlist_head *handlers)
{
	struct prop_handler *h;

	if (!handlers) {
		u64 hash = btrfs_name_hash(name, strlen(name));

		handlers = find_prop_handlers_by_hash(hash);
		if (!handlers)
			return NULL;
	}

	hlist_for_each_entry(h, handlers, node)
		if (!strcmp(h->xattr_name, name))
			return h;

	return NULL;
}

static int __btrfs_set_prop(struct btrfs_trans_handle *trans,
			    struct inode *inode,
			    const char *name,
			    const char *value,
			    size_t value_len,
			    int flags)
{
	const struct prop_handler *handler;
	int ret;

	if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
		return -EINVAL;

	handler = find_prop_handler(name, NULL);
	if (!handler)
		return -EINVAL;

	if (value_len == 0) {
		ret = btrfs_setxattr(trans, inode, handler->xattr_name,
				       NULL, 0, flags);
		if (ret)
			return ret;

		ret = handler->apply(inode, NULL, 0);
		ASSERT(ret == 0);

		return ret;
	}

	ret = handler->validate(value, value_len);
	if (ret)
		return ret;
	ret = btrfs_setxattr(trans, inode, handler->xattr_name,
			       value, value_len, flags);
	if (ret)
		return ret;
	ret = handler->apply(inode, value, value_len);
	if (ret) {
		btrfs_setxattr(trans, inode, handler->xattr_name,
				 NULL, 0, flags);
		return ret;
	}

	set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);

	return 0;
}

int btrfs_set_prop(struct inode *inode,
		   const char *name,
		   const char *value,
		   size_t value_len,
		   int flags)
{
	return __btrfs_set_prop(NULL, inode, name, value, value_len, flags);
}

static int iterate_object_props(struct btrfs_root *root,
				struct btrfs_path *path,
				u64 objectid,
				void (*iterator)(void *,
						 const struct prop_handler *,
						 const char *,
						 size_t),
				void *ctx)
{
	int ret;
	char *name_buf = NULL;
	char *value_buf = NULL;
	int name_buf_len = 0;
	int value_buf_len = 0;

	while (1) {
		struct btrfs_key key;
		struct btrfs_dir_item *di;
		struct extent_buffer *leaf;
		u32 total_len, cur, this_len;
		int slot;
		const struct hlist_head *handlers;

		slot = path->slots[0];
		leaf = path->nodes[0];

		if (slot >= btrfs_header_nritems(leaf)) {
			ret = btrfs_next_leaf(root, path);
			if (ret < 0)
				goto out;
			else if (ret > 0)
				break;
			continue;
		}

		btrfs_item_key_to_cpu(leaf, &key, slot);
		if (key.objectid != objectid)
			break;
		if (key.type != BTRFS_XATTR_ITEM_KEY)
			break;

		handlers = find_prop_handlers_by_hash(key.offset);
		if (!handlers)
			goto next_slot;

		di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
		cur = 0;
		total_len = btrfs_item_size_nr(leaf, slot);

		while (cur < total_len) {
			u32 name_len = btrfs_dir_name_len(leaf, di);
			u32 data_len = btrfs_dir_data_len(leaf, di);
			unsigned long name_ptr, data_ptr;
			const struct prop_handler *handler;

			this_len = sizeof(*di) + name_len + data_len;
			name_ptr = (unsigned long)(di + 1);
			data_ptr = name_ptr + name_len;

			if (name_len <= XATTR_BTRFS_PREFIX_LEN ||
			    memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX,
						 name_ptr,
						 XATTR_BTRFS_PREFIX_LEN))
				goto next_dir_item;

			if (name_len >= name_buf_len) {
				kfree(name_buf);
				name_buf_len = name_len + 1;
				name_buf = kmalloc(name_buf_len, GFP_NOFS);
				if (!name_buf) {
					ret = -ENOMEM;
					goto out;
				}
			}
			read_extent_buffer(leaf, name_buf, name_ptr, name_len);
			name_buf[name_len] = '\0';

			handler = find_prop_handler(name_buf, handlers);
			if (!handler)
				goto next_dir_item;

			if (data_len > value_buf_len) {
				kfree(value_buf);
				value_buf_len = data_len;
				value_buf = kmalloc(data_len, GFP_NOFS);
				if (!value_buf) {
					ret = -ENOMEM;
					goto out;
				}
			}
			read_extent_buffer(leaf, value_buf, data_ptr, data_len);

			iterator(ctx, handler, value_buf, data_len);
next_dir_item:
			cur += this_len;
			di = (struct btrfs_dir_item *)((char *) di + this_len);
		}

next_slot:
		path->slots[0]++;
	}

	ret = 0;
out:
	btrfs_release_path(path);
	kfree(name_buf);
	kfree(value_buf);

	return ret;
}

static void inode_prop_iterator(void *ctx,
				const struct prop_handler *handler,
				const char *value,
				size_t len)
{
	struct inode *inode = ctx;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret;

	ret = handler->apply(inode, value, len);
	if (unlikely(ret))
		btrfs_warn(root->fs_info,
			   "error applying prop %s to ino %llu (root %llu): %d",
			   handler->xattr_name, btrfs_ino(BTRFS_I(inode)),
			   root->root_key.objectid, ret);
	else
		set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
}

int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	u64 ino = btrfs_ino(BTRFS_I(inode));
	int ret;

	ret = iterate_object_props(root, path, ino, inode_prop_iterator, inode);

	return ret;
}

static int inherit_props(struct btrfs_trans_handle *trans,
			 struct inode *inode,
			 struct inode *parent)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_fs_info *fs_info = root->fs_info;
	int ret;
	int i;

	if (!test_bit(BTRFS_INODE_HAS_PROPS,
		      &BTRFS_I(parent)->runtime_flags))
		return 0;

	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
		const struct prop_handler *h = &prop_handlers[i];
		const char *value;
		u64 num_bytes;

		if (!h->inheritable)
			continue;

		value = h->extract(parent);
		if (!value)
			continue;

		num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
		ret = btrfs_block_rsv_add(root, trans->block_rsv,
					  num_bytes, BTRFS_RESERVE_NO_FLUSH);
		if (ret)
			goto out;
		ret = __btrfs_set_prop(trans, inode, h->xattr_name,
				       value, strlen(value), 0);
		btrfs_block_rsv_release(fs_info, trans->block_rsv, num_bytes);
		if (ret)
			goto out;
	}
	ret = 0;
out:
	return ret;
}

int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
			      struct inode *inode,
			      struct inode *dir)
{
	if (!dir)
		return 0;

	return inherit_props(trans, inode, dir);
}

int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root,
			       struct btrfs_root *parent_root)
{
	struct super_block *sb = root->fs_info->sb;
	struct btrfs_key key;
	struct inode *parent_inode, *child_inode;
	int ret;

	key.objectid = BTRFS_FIRST_FREE_OBJECTID;
	key.type = BTRFS_INODE_ITEM_KEY;
	key.offset = 0;

	parent_inode = btrfs_iget(sb, &key, parent_root, NULL);
	if (IS_ERR(parent_inode))
		return PTR_ERR(parent_inode);

	child_inode = btrfs_iget(sb, &key, root, NULL);
	if (IS_ERR(child_inode)) {
		iput(parent_inode);
		return PTR_ERR(child_inode);
	}

	ret = inherit_props(trans, child_inode, parent_inode);
	iput(child_inode);
	iput(parent_inode);

	return ret;
}

static int prop_compression_validate(const char *value, size_t len)
{
	if (!strncmp("lzo", value, 3))
		return 0;
	else if (!strncmp("zlib", value, 4))
		return 0;
	else if (!strncmp("zstd", value, 4))
		return 0;

	return -EINVAL;
}

static int prop_compression_apply(struct inode *inode,
				  const char *value,
				  size_t len)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	int type;

	if (len == 0) {
		BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
		BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
		BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;

		return 0;
	}

	if (!strncmp("lzo", value, 3)) {
		type = BTRFS_COMPRESS_LZO;
		btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
	} else if (!strncmp("zlib", value, 4)) {
		type = BTRFS_COMPRESS_ZLIB;
	} else if (!strncmp("zstd", value, 4)) {
		type = BTRFS_COMPRESS_ZSTD;
		btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
	} else {
		return -EINVAL;
	}

	BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
	BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
	BTRFS_I(inode)->prop_compress = type;

	return 0;
}

static const char *prop_compression_extract(struct inode *inode)
{
	switch (BTRFS_I(inode)->prop_compress) {
	case BTRFS_COMPRESS_ZLIB:
	case BTRFS_COMPRESS_LZO:
	case BTRFS_COMPRESS_ZSTD:
		return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress);
	default:
		break;
	}

	return NULL;
}
Commit	Line	Data
c1d7c514	1	// SPDX-License-Identifier: GPL-2.0
63541927 FDBM	2	/*
63541927 FDBM	3	* Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
63541927 FDBM	4	*/
	5
	6	#include <linux/hashtable.h>
	7	#include "props.h"
	8	#include "btrfs_inode.h"
63541927	9	#include "transaction.h"
9678c543	10	#include "ctree.h"
63541927	11	#include "xattr.h"
ebb8765b	12	#include "compression.h"
63541927 FDBM	13
	14	#define BTRFS_PROP_HANDLERS_HT_BITS 8
	15	static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS);
	16
	17	struct prop_handler {
	18	struct hlist_node node;
	19	const char *xattr_name;
	20	int (validate)(const char value, size_t len);
	21	int (apply)(struct inode inode, const char *value, size_t len);
	22	const char (extract)(struct inode *inode);
	23	int inheritable;
	24	};
	25
	26	static int prop_compression_validate(const char *value, size_t len);
	27	static int prop_compression_apply(struct inode *inode,
	28	const char *value,
	29	size_t len);
	30	static const char prop_compression_extract(struct inode inode);
	31
	32	static struct prop_handler prop_handlers[] = {
	33	{
	34	.xattr_name = XATTR_BTRFS_PREFIX "compression",
	35	.validate = prop_compression_validate,
	36	.apply = prop_compression_apply,
	37	.extract = prop_compression_extract,
	38	.inheritable = 1
	39	},
63541927 FDBM	40	};
	41
	42	void __init btrfs_props_init(void)
	43	{
619ed392	44	int i;
63541927 FDBM	45
	46	hash_init(prop_handlers_ht);
	47
619ed392 BL	48	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
619ed392 BL	49	struct prop_handler *p = &prop_handlers[i];
63541927 FDBM	50	u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));
	51
	52	hash_add(prop_handlers_ht, &p->node, h);
	53	}
	54	}
	55
	56	static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash)
	57	{
	58	struct hlist_head *h;
	59
	60	h = &prop_handlers_ht[hash_min(hash, BTRFS_PROP_HANDLERS_HT_BITS)];
	61	if (hlist_empty(h))
	62	return NULL;
	63
	64	return h;
	65	}
	66
	67	static const struct prop_handler *
	68	find_prop_handler(const char *name,
	69	const struct hlist_head *handlers)
	70	{
	71	struct prop_handler *h;
	72
	73	if (!handlers) {
	74	u64 hash = btrfs_name_hash(name, strlen(name));
	75
	76	handlers = find_prop_handlers_by_hash(hash);
	77	if (!handlers)
	78	return NULL;
	79	}
	80
	81	hlist_for_each_entry(h, handlers, node)
	82	if (!strcmp(h->xattr_name, name))
	83	return h;
	84
	85	return NULL;
	86	}
	87
	88	static int __btrfs_set_prop(struct btrfs_trans_handle *trans,
	89	struct inode *inode,
	90	const char *name,
	91	const char *value,
	92	size_t value_len,
	93	int flags)
	94	{
	95	const struct prop_handler *handler;
	96	int ret;
	97
	98	if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
	99	return -EINVAL;
	100
	101	handler = find_prop_handler(name, NULL);
	102	if (!handler)
	103	return -EINVAL;
	104
	105	if (value_len == 0) {
7852781d	106	ret = btrfs_setxattr(trans, inode, handler->xattr_name,
63541927 FDBM	107	NULL, 0, flags);
	108	if (ret)
	109	return ret;
	110
	111	ret = handler->apply(inode, NULL, 0);
	112	ASSERT(ret == 0);
	113
	114	return ret;
	115	}
	116
	117	ret = handler->validate(value, value_len);
	118	if (ret)
	119	return ret;
7852781d	120	ret = btrfs_setxattr(trans, inode, handler->xattr_name,
63541927 FDBM	121	value, value_len, flags);
	122	if (ret)
	123	return ret;
	124	ret = handler->apply(inode, value, value_len);
	125	if (ret) {
7852781d	126	btrfs_setxattr(trans, inode, handler->xattr_name,
63541927 FDBM	127	NULL, 0, flags);
	128	return ret;
	129	}
	130
	131	set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
	132
	133	return 0;
	134	}
	135
	136	int btrfs_set_prop(struct inode *inode,
	137	const char *name,
	138	const char *value,
	139	size_t value_len,
	140	int flags)
	141	{
	142	return __btrfs_set_prop(NULL, inode, name, value, value_len, flags);
	143	}
	144
	145	static int iterate_object_props(struct btrfs_root *root,
	146	struct btrfs_path *path,
	147	u64 objectid,
	148	void (iterator)(void ,
	149	const struct prop_handler *,
	150	const char *,
	151	size_t),
	152	void *ctx)
	153	{
	154	int ret;
	155	char *name_buf = NULL;
	156	char *value_buf = NULL;
	157	int name_buf_len = 0;
	158	int value_buf_len = 0;
	159
	160	while (1) {
	161	struct btrfs_key key;
	162	struct btrfs_dir_item *di;
	163	struct extent_buffer *leaf;
	164	u32 total_len, cur, this_len;
	165	int slot;
	166	const struct hlist_head *handlers;
	167
	168	slot = path->slots[0];
	169	leaf = path->nodes[0];
	170
	171	if (slot >= btrfs_header_nritems(leaf)) {
	172	ret = btrfs_next_leaf(root, path);
	173	if (ret < 0)
	174	goto out;
	175	else if (ret > 0)
	176	break;
	177	continue;
	178	}
	179
	180	btrfs_item_key_to_cpu(leaf, &key, slot);
	181	if (key.objectid != objectid)
	182	break;
	183	if (key.type != BTRFS_XATTR_ITEM_KEY)
	184	break;
	185
	186	handlers = find_prop_handlers_by_hash(key.offset);
	187	if (!handlers)
	188	goto next_slot;
	189
	190	di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
191	cur = 0;
192	total_len = btrfs_item_size_nr(leaf, slot);
193
194	while (cur < total_len) {
195	u32 name_len = btrfs_dir_name_len(leaf, di);
196	u32 data_len = btrfs_dir_data_len(leaf, di);
197	unsigned long name_ptr, data_ptr;
198	const struct prop_handler *handler;
199
200	this_len = sizeof(*di) + name_len + data_len;
201	name_ptr = (unsigned long)(di + 1);
202	data_ptr = name_ptr + name_len;
203
204	if (name_len <= XATTR_BTRFS_PREFIX_LEN \|\|
205	memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX,
206	name_ptr,
207	XATTR_BTRFS_PREFIX_LEN))
208	goto next_dir_item;
209
210	if (name_len >= name_buf_len) {
211	kfree(name_buf);
212	name_buf_len = name_len + 1;
213	name_buf = kmalloc(name_buf_len, GFP_NOFS);
214	if (!name_buf) {
215	ret = -ENOMEM;
216	goto out;
217	}
218	}
219	read_extent_buffer(leaf, name_buf, name_ptr, name_len);
220	name_buf[name_len] = '\0';
221
222	handler = find_prop_handler(name_buf, handlers);
223	if (!handler)
224	goto next_dir_item;
225
226	if (data_len > value_buf_len) {
227	kfree(value_buf);
228	value_buf_len = data_len;
229	value_buf = kmalloc(data_len, GFP_NOFS);
230	if (!value_buf) {
231	ret = -ENOMEM;
232	goto out;
233	}
234	}
235	read_extent_buffer(leaf, value_buf, data_ptr, data_len);
236
237	iterator(ctx, handler, value_buf, data_len);
238	next_dir_item:
239	cur += this_len;
240	di = (struct btrfs_dir_item )((char ) di + this_len);
241	}
242
243	next_slot:
244	path->slots[0]++;
245	}
246
247	ret = 0;
248	out:
249	btrfs_release_path(path);
250	kfree(name_buf);
251	kfree(value_buf);
252
253	return ret;
254	}
255
256	static void inode_prop_iterator(void *ctx,
257	const struct prop_handler *handler,
258	const char *value,
259	size_t len)
260	{
261	struct inode *inode = ctx;
262	struct btrfs_root *root = BTRFS_I(inode)->root;
263	int ret;
264
265	ret = handler->apply(inode, value, len);
266	if (unlikely(ret))
267	btrfs_warn(root->fs_info,
268	"error applying prop %s to ino %llu (root %llu): %d",
4a0cc7ca	269	handler->xattr_name, btrfs_ino(BTRFS_I(inode)),
63541927 FDBM	270	root->root_key.objectid, ret);
	271	else
	272	set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
	273	}
	274
	275	int btrfs_load_inode_props(struct inode inode, struct btrfs_path path)
	276	{
	277	struct btrfs_root *root = BTRFS_I(inode)->root;
4a0cc7ca	278	u64 ino = btrfs_ino(BTRFS_I(inode));
63541927 FDBM	279	int ret;
	280
	281	ret = iterate_object_props(root, path, ino, inode_prop_iterator, inode);
	282
	283	return ret;
	284	}
	285
	286	static int inherit_props(struct btrfs_trans_handle *trans,
	287	struct inode *inode,
	288	struct inode *parent)
	289	{
63541927	290	struct btrfs_root *root = BTRFS_I(inode)->root;
2ff7e61e	291	struct btrfs_fs_info *fs_info = root->fs_info;
63541927	292	int ret;
619ed392	293	int i;
63541927 FDBM	294
	295	if (!test_bit(BTRFS_INODE_HAS_PROPS,
	296	&BTRFS_I(parent)->runtime_flags))
	297	return 0;
	298
619ed392 BL	299	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
619ed392 BL	300	const struct prop_handler *h = &prop_handlers[i];
63541927 FDBM	301	const char *value;
	302	u64 num_bytes;
	303
	304	if (!h->inheritable)
	305	continue;
	306
	307	value = h->extract(parent);
	308	if (!value)
	309	continue;
	310
2ff7e61e	311	num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
63541927 FDBM	312	ret = btrfs_block_rsv_add(root, trans->block_rsv,
	313	num_bytes, BTRFS_RESERVE_NO_FLUSH);
	314	if (ret)
	315	goto out;
	316	ret = __btrfs_set_prop(trans, inode, h->xattr_name,
	317	value, strlen(value), 0);
2ff7e61e	318	btrfs_block_rsv_release(fs_info, trans->block_rsv, num_bytes);
63541927 FDBM	319	if (ret)
	320	goto out;
	321	}
	322	ret = 0;
	323	out:
	324	return ret;
	325	}
	326
	327	int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
	328	struct inode *inode,
	329	struct inode *dir)
	330	{
	331	if (!dir)
	332	return 0;
	333
	334	return inherit_props(trans, inode, dir);
	335	}
	336
	337	int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
	338	struct btrfs_root *root,
	339	struct btrfs_root *parent_root)
	340	{
bd6c57dd	341	struct super_block *sb = root->fs_info->sb;
63541927 FDBM	342	struct btrfs_key key;
	343	struct inode parent_inode, child_inode;
	344	int ret;
	345
	346	key.objectid = BTRFS_FIRST_FREE_OBJECTID;
	347	key.type = BTRFS_INODE_ITEM_KEY;
	348	key.offset = 0;
	349
bd6c57dd	350	parent_inode = btrfs_iget(sb, &key, parent_root, NULL);
63541927 FDBM	351	if (IS_ERR(parent_inode))
	352	return PTR_ERR(parent_inode);
	353
bd6c57dd	354	child_inode = btrfs_iget(sb, &key, root, NULL);
63541927 FDBM	355	if (IS_ERR(child_inode)) {
	356	iput(parent_inode);
	357	return PTR_ERR(child_inode);
	358	}
	359
	360	ret = inherit_props(trans, child_inode, parent_inode);
	361	iput(child_inode);
	362	iput(parent_inode);
	363
	364	return ret;
	365	}
	366
	367	static int prop_compression_validate(const char *value, size_t len)
	368	{
272e5326	369	if (!strncmp("lzo", value, 3))
63541927	370	return 0;
272e5326	371	else if (!strncmp("zlib", value, 4))
63541927	372	return 0;
272e5326	373	else if (!strncmp("zstd", value, 4))
5c1aab1d	374	return 0;
63541927 FDBM	375
	376	return -EINVAL;
	377	}
	378
	379	static int prop_compression_apply(struct inode *inode,
	380	const char *value,
	381	size_t len)
	382	{
1a63c198	383	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
63541927 FDBM	384	int type;
	385
	386	if (len == 0) {
	387	BTRFS_I(inode)->flags \|= BTRFS_INODE_NOCOMPRESS;
	388	BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
b52aa8c9	389	BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;
63541927 FDBM	390
	391	return 0;
	392	}
	393
1a63c198	394	if (!strncmp("lzo", value, 3)) {
63541927	395	type = BTRFS_COMPRESS_LZO;
1a63c198 MT	396	btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1a63c198 MT	397	} else if (!strncmp("zlib", value, 4)) {
63541927	398	type = BTRFS_COMPRESS_ZLIB;
50398fde	399	} else if (!strncmp("zstd", value, 4)) {
5c1aab1d	400	type = BTRFS_COMPRESS_ZSTD;
1a63c198 MT	401	btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1a63c198 MT	402	} else {
63541927	403	return -EINVAL;
1a63c198	404	}
63541927 FDBM	405
	406	BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
	407	BTRFS_I(inode)->flags \|= BTRFS_INODE_COMPRESS;
b52aa8c9	408	BTRFS_I(inode)->prop_compress = type;
63541927 FDBM	409
	410	return 0;
	411	}
	412
	413	static const char prop_compression_extract(struct inode inode)
	414	{
b52aa8c9	415	switch (BTRFS_I(inode)->prop_compress) {
63541927	416	case BTRFS_COMPRESS_ZLIB:
63541927	417	case BTRFS_COMPRESS_LZO:
5c1aab1d	418	case BTRFS_COMPRESS_ZSTD:
802a5c69 DS	419	return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress);
	420	default:
	421	break;
63541927 FDBM	422	}
	423
	424	return NULL;
	425	}
e8c9f186 DS	426
e8c9f186 DS	427