[linux-block.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;
}

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;
}

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
7715da84 AJ	88	int btrfs_set_prop(struct btrfs_trans_handle trans, struct inode inode,
	89	const char name, const char value, size_t value_len,
	90	int flags)
63541927 FDBM	91	{
	92	const struct prop_handler *handler;
	93	int ret;
	94
	95	if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
	96	return -EINVAL;
	97
	98	handler = find_prop_handler(name, NULL);
	99	if (!handler)
	100	return -EINVAL;
	101
	102	if (value_len == 0) {
7852781d	103	ret = btrfs_setxattr(trans, inode, handler->xattr_name,
63541927 FDBM	104	NULL, 0, flags);
	105	if (ret)
	106	return ret;
	107
	108	ret = handler->apply(inode, NULL, 0);
	109	ASSERT(ret == 0);
	110
	111	return ret;
	112	}
	113
	114	ret = handler->validate(value, value_len);
	115	if (ret)
	116	return ret;
7852781d	117	ret = btrfs_setxattr(trans, inode, handler->xattr_name,
63541927 FDBM	118	value, value_len, flags);
	119	if (ret)
	120	return ret;
	121	ret = handler->apply(inode, value, value_len);
	122	if (ret) {
7852781d	123	btrfs_setxattr(trans, inode, handler->xattr_name,
63541927 FDBM	124	NULL, 0, flags);
	125	return ret;
	126	}
	127
	128	set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
	129
	130	return 0;
	131	}
	132
63541927 FDBM	133	static int iterate_object_props(struct btrfs_root *root,
	134	struct btrfs_path *path,
	135	u64 objectid,
	136	void (iterator)(void ,
	137	const struct prop_handler *,
	138	const char *,
	139	size_t),
	140	void *ctx)
	141	{
	142	int ret;
	143	char *name_buf = NULL;
	144	char *value_buf = NULL;
	145	int name_buf_len = 0;
	146	int value_buf_len = 0;
	147
	148	while (1) {
	149	struct btrfs_key key;
	150	struct btrfs_dir_item *di;
	151	struct extent_buffer *leaf;
	152	u32 total_len, cur, this_len;
	153	int slot;
	154	const struct hlist_head *handlers;
	155
	156	slot = path->slots[0];
	157	leaf = path->nodes[0];
	158
	159	if (slot >= btrfs_header_nritems(leaf)) {
	160	ret = btrfs_next_leaf(root, path);
	161	if (ret < 0)
	162	goto out;
	163	else if (ret > 0)
	164	break;
	165	continue;
	166	}
	167
	168	btrfs_item_key_to_cpu(leaf, &key, slot);
	169	if (key.objectid != objectid)
	170	break;
	171	if (key.type != BTRFS_XATTR_ITEM_KEY)
	172	break;
	173
	174	handlers = find_prop_handlers_by_hash(key.offset);
	175	if (!handlers)
	176	goto next_slot;
	177
	178	di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
	179	cur = 0;
	180	total_len = btrfs_item_size_nr(leaf, slot);
	181
	182	while (cur < total_len) {
	183	u32 name_len = btrfs_dir_name_len(leaf, di);
	184	u32 data_len = btrfs_dir_data_len(leaf, di);
	185	unsigned long name_ptr, data_ptr;
	186	const struct prop_handler *handler;
	187
	188	this_len = sizeof(*di) + name_len + data_len;
	189	name_ptr = (unsigned long)(di + 1);
	190	data_ptr = name_ptr + name_len;
	191
	192	if (name_len <= XATTR_BTRFS_PREFIX_LEN \|\|
	193	memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX,
	194	name_ptr,
	195	XATTR_BTRFS_PREFIX_LEN))
	196	goto next_dir_item;
197
198	if (name_len >= name_buf_len) {
199	kfree(name_buf);
200	name_buf_len = name_len + 1;
201	name_buf = kmalloc(name_buf_len, GFP_NOFS);
202	if (!name_buf) {
203	ret = -ENOMEM;
204	goto out;
205	}
206	}
207	read_extent_buffer(leaf, name_buf, name_ptr, name_len);
208	name_buf[name_len] = '\0';
209
210	handler = find_prop_handler(name_buf, handlers);
211	if (!handler)
212	goto next_dir_item;
213
214	if (data_len > value_buf_len) {
215	kfree(value_buf);
216	value_buf_len = data_len;
217	value_buf = kmalloc(data_len, GFP_NOFS);
218	if (!value_buf) {
219	ret = -ENOMEM;
220	goto out;
221	}
222	}
223	read_extent_buffer(leaf, value_buf, data_ptr, data_len);
224
225	iterator(ctx, handler, value_buf, data_len);
226	next_dir_item:
227	cur += this_len;
228	di = (struct btrfs_dir_item )((char ) di + this_len);
229	}
230
231	next_slot:
232	path->slots[0]++;
233	}
234
235	ret = 0;
236	out:
237	btrfs_release_path(path);
238	kfree(name_buf);
239	kfree(value_buf);
240
241	return ret;
242	}
243
244	static void inode_prop_iterator(void *ctx,
245	const struct prop_handler *handler,
246	const char *value,
247	size_t len)
248	{
249	struct inode *inode = ctx;
250	struct btrfs_root *root = BTRFS_I(inode)->root;
251	int ret;
252
253	ret = handler->apply(inode, value, len);
254	if (unlikely(ret))
255	btrfs_warn(root->fs_info,
256	"error applying prop %s to ino %llu (root %llu): %d",
4a0cc7ca	257	handler->xattr_name, btrfs_ino(BTRFS_I(inode)),
63541927 FDBM	258	root->root_key.objectid, ret);
	259	else
	260	set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
	261	}
	262
	263	int btrfs_load_inode_props(struct inode inode, struct btrfs_path path)
	264	{
	265	struct btrfs_root *root = BTRFS_I(inode)->root;
4a0cc7ca	266	u64 ino = btrfs_ino(BTRFS_I(inode));
63541927 FDBM	267	int ret;
	268
	269	ret = iterate_object_props(root, path, ino, inode_prop_iterator, inode);
	270
	271	return ret;
	272	}
	273
	274	static int inherit_props(struct btrfs_trans_handle *trans,
	275	struct inode *inode,
	276	struct inode *parent)
	277	{
63541927	278	struct btrfs_root *root = BTRFS_I(inode)->root;
2ff7e61e	279	struct btrfs_fs_info *fs_info = root->fs_info;
63541927	280	int ret;
619ed392	281	int i;
63541927 FDBM	282
	283	if (!test_bit(BTRFS_INODE_HAS_PROPS,
	284	&BTRFS_I(parent)->runtime_flags))
	285	return 0;
	286
619ed392 BL	287	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
619ed392 BL	288	const struct prop_handler *h = &prop_handlers[i];
63541927 FDBM	289	const char *value;
	290	u64 num_bytes;
	291
	292	if (!h->inheritable)
	293	continue;
	294
	295	value = h->extract(parent);
	296	if (!value)
	297	continue;
	298
2ff7e61e	299	num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
63541927 FDBM	300	ret = btrfs_block_rsv_add(root, trans->block_rsv,
	301	num_bytes, BTRFS_RESERVE_NO_FLUSH);
	302	if (ret)
	303	goto out;
7715da84 AJ	304	ret = btrfs_set_prop(trans, inode, h->xattr_name, value,
7715da84 AJ	305	strlen(value), 0);
2ff7e61e	306	btrfs_block_rsv_release(fs_info, trans->block_rsv, num_bytes);
63541927 FDBM	307	if (ret)
	308	goto out;
	309	}
	310	ret = 0;
	311	out:
	312	return ret;
	313	}
	314
	315	int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
	316	struct inode *inode,
	317	struct inode *dir)
	318	{
	319	if (!dir)
	320	return 0;
	321
	322	return inherit_props(trans, inode, dir);
	323	}
	324
	325	int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
	326	struct btrfs_root *root,
	327	struct btrfs_root *parent_root)
	328	{
bd6c57dd	329	struct super_block *sb = root->fs_info->sb;
63541927 FDBM	330	struct btrfs_key key;
	331	struct inode parent_inode, child_inode;
	332	int ret;
	333
	334	key.objectid = BTRFS_FIRST_FREE_OBJECTID;
	335	key.type = BTRFS_INODE_ITEM_KEY;
	336	key.offset = 0;
	337
bd6c57dd	338	parent_inode = btrfs_iget(sb, &key, parent_root, NULL);
63541927 FDBM	339	if (IS_ERR(parent_inode))
	340	return PTR_ERR(parent_inode);
	341
bd6c57dd	342	child_inode = btrfs_iget(sb, &key, root, NULL);
63541927 FDBM	343	if (IS_ERR(child_inode)) {
	344	iput(parent_inode);
	345	return PTR_ERR(child_inode);
	346	}
	347
	348	ret = inherit_props(trans, child_inode, parent_inode);
	349	iput(child_inode);
	350	iput(parent_inode);
	351
	352	return ret;
	353	}
	354
	355	static int prop_compression_validate(const char *value, size_t len)
	356	{
272e5326	357	if (!strncmp("lzo", value, 3))
63541927	358	return 0;
272e5326	359	else if (!strncmp("zlib", value, 4))
63541927	360	return 0;
272e5326	361	else if (!strncmp("zstd", value, 4))
5c1aab1d	362	return 0;
63541927 FDBM	363
	364	return -EINVAL;
	365	}
	366
	367	static int prop_compression_apply(struct inode *inode,
	368	const char *value,
	369	size_t len)
	370	{
1a63c198	371	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
63541927 FDBM	372	int type;
	373
	374	if (len == 0) {
	375	BTRFS_I(inode)->flags \|= BTRFS_INODE_NOCOMPRESS;
	376	BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
b52aa8c9	377	BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;
63541927 FDBM	378
	379	return 0;
	380	}
	381
1a63c198	382	if (!strncmp("lzo", value, 3)) {
63541927	383	type = BTRFS_COMPRESS_LZO;
1a63c198 MT	384	btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1a63c198 MT	385	} else if (!strncmp("zlib", value, 4)) {
63541927	386	type = BTRFS_COMPRESS_ZLIB;
50398fde	387	} else if (!strncmp("zstd", value, 4)) {
5c1aab1d	388	type = BTRFS_COMPRESS_ZSTD;
1a63c198 MT	389	btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1a63c198 MT	390	} else {
63541927	391	return -EINVAL;
1a63c198	392	}
63541927 FDBM	393
	394	BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
	395	BTRFS_I(inode)->flags \|= BTRFS_INODE_COMPRESS;
b52aa8c9	396	BTRFS_I(inode)->prop_compress = type;
63541927 FDBM	397
	398	return 0;
	399	}
	400
	401	static const char prop_compression_extract(struct inode inode)
	402	{
b52aa8c9	403	switch (BTRFS_I(inode)->prop_compress) {
63541927	404	case BTRFS_COMPRESS_ZLIB:
63541927	405	case BTRFS_COMPRESS_LZO:
5c1aab1d	406	case BTRFS_COMPRESS_ZSTD:
802a5c69 DS	407	return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress);
	408	default:
	409	break;
63541927 FDBM	410	}
	411
	412	return NULL;
	413	}
e8c9f186 DS	414
e8c9f186 DS	415