Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/hashtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include "props.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "btrfs_inode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "transaction.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "ctree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "compression.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #define BTRFS_PROP_HANDLERS_HT_BITS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) struct prop_handler {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	struct hlist_node node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	const char *xattr_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	int (*validate)(const char *value, size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	int (*apply)(struct inode *inode, const char *value, size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	const char *(*extract)(struct inode *inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	int inheritable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct hlist_head *h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	h = &prop_handlers_ht[hash_min(hash, BTRFS_PROP_HANDLERS_HT_BITS)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	if (hlist_empty(h))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	return h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static const struct prop_handler *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) find_prop_handler(const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		  const struct hlist_head *handlers)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct prop_handler *h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	if (!handlers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		u64 hash = btrfs_name_hash(name, strlen(name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		handlers = find_prop_handlers_by_hash(hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		if (!handlers)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	hlist_for_each_entry(h, handlers, node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		if (!strcmp(h->xattr_name, name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			return h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) int btrfs_validate_prop(const char *name, const char *value, size_t value_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	const struct prop_handler *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	handler = find_prop_handler(name, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (!handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	if (value_len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	return handler->validate(value, value_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		   const char *name, const char *value, size_t value_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		   int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	const struct prop_handler *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	handler = find_prop_handler(name, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (!handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (value_len == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		ret = btrfs_setxattr(trans, inode, handler->xattr_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 				     NULL, 0, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		ret = handler->apply(inode, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		ASSERT(ret == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	ret = btrfs_setxattr(trans, inode, handler->xattr_name, value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			     value_len, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	ret = handler->apply(inode, value, value_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		btrfs_setxattr(trans, inode, handler->xattr_name, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			       0, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int iterate_object_props(struct btrfs_root *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 				struct btrfs_path *path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 				u64 objectid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 				void (*iterator)(void *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 						 const struct prop_handler *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 						 const char *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 						 size_t),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 				void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	char *name_buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	char *value_buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	int name_buf_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	int value_buf_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		struct btrfs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		struct btrfs_dir_item *di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		u32 total_len, cur, this_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		const struct hlist_head *handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		if (slot >= btrfs_header_nritems(leaf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			ret = btrfs_next_leaf(root, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			else if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		btrfs_item_key_to_cpu(leaf, &key, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		if (key.objectid != objectid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		if (key.type != BTRFS_XATTR_ITEM_KEY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		handlers = find_prop_handlers_by_hash(key.offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		if (!handlers)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			goto next_slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		cur = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		total_len = btrfs_item_size_nr(leaf, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		while (cur < total_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			u32 name_len = btrfs_dir_name_len(leaf, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			u32 data_len = btrfs_dir_data_len(leaf, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			unsigned long name_ptr, data_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			const struct prop_handler *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			this_len = sizeof(*di) + name_len + data_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			name_ptr = (unsigned long)(di + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			data_ptr = name_ptr + name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			if (name_len <= XATTR_BTRFS_PREFIX_LEN ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			    memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 						 name_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 						 XATTR_BTRFS_PREFIX_LEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 				goto next_dir_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			if (name_len >= name_buf_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 				kfree(name_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 				name_buf_len = name_len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 				name_buf = kmalloc(name_buf_len, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 				if (!name_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 					ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 					goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			read_extent_buffer(leaf, name_buf, name_ptr, name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			name_buf[name_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			handler = find_prop_handler(name_buf, handlers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			if (!handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 				goto next_dir_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			if (data_len > value_buf_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 				kfree(value_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 				value_buf_len = data_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 				value_buf = kmalloc(data_len, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 				if (!value_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 					ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 					goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			read_extent_buffer(leaf, value_buf, data_ptr, data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			iterator(ctx, handler, value_buf, data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) next_dir_item:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			cur += this_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			di = (struct btrfs_dir_item *)((char *) di + this_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) next_slot:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		path->slots[0]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	kfree(name_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	kfree(value_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static void inode_prop_iterator(void *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 				const struct prop_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 				const char *value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 				size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	struct inode *inode = ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	ret = handler->apply(inode, value, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		btrfs_warn(root->fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			   "error applying prop %s to ino %llu (root %llu): %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			   handler->xattr_name, btrfs_ino(BTRFS_I(inode)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			   root->root_key.objectid, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	u64 ino = btrfs_ino(BTRFS_I(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	ret = iterate_object_props(root, path, ino, inode_prop_iterator, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static int prop_compression_validate(const char *value, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (!value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (btrfs_compress_is_valid_type(value, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static int prop_compression_apply(struct inode *inode, const char *value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 				  size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (len == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (!strncmp("lzo", value, 3)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		type = BTRFS_COMPRESS_LZO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	} else if (!strncmp("zlib", value, 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		type = BTRFS_COMPRESS_ZLIB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	} else if (!strncmp("zstd", value, 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		type = BTRFS_COMPRESS_ZSTD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	BTRFS_I(inode)->prop_compress = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static const char *prop_compression_extract(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	switch (BTRFS_I(inode)->prop_compress) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	case BTRFS_COMPRESS_ZLIB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	case BTRFS_COMPRESS_LZO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	case BTRFS_COMPRESS_ZSTD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static struct prop_handler prop_handlers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		.xattr_name = XATTR_BTRFS_PREFIX "compression",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		.validate = prop_compression_validate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		.apply = prop_compression_apply,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		.extract = prop_compression_extract,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		.inheritable = 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static int inherit_props(struct btrfs_trans_handle *trans,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 			 struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			 struct inode *parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	struct btrfs_fs_info *fs_info = root->fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	bool need_reserve = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	if (!test_bit(BTRFS_INODE_HAS_PROPS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		      &BTRFS_I(parent)->runtime_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		const struct prop_handler *h = &prop_handlers[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		const char *value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		u64 num_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		if (!h->inheritable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		value = h->extract(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		if (!value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		 * This is not strictly necessary as the property should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		 * valid, but in case it isn't, don't propagate it futher.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		ret = h->validate(value, strlen(value));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		 * Currently callers should be reserving 1 item for properties,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		 * since we only have 1 property that we currently support.  If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		 * we add more in the future we need to try and reserve more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		 * space for them.  But we should also revisit how we do space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		 * reservations if we do add more properties in the future.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		if (need_reserve) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 			num_bytes = btrfs_calc_insert_metadata_size(fs_info, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			ret = btrfs_block_rsv_add(root, trans->block_rsv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 					num_bytes, BTRFS_RESERVE_NO_FLUSH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		ret = btrfs_setxattr(trans, inode, h->xattr_name, value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 				     strlen(value), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 			ret = h->apply(inode, value, strlen(value));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 				btrfs_setxattr(trans, inode, h->xattr_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 					       NULL, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 				set_bit(BTRFS_INODE_HAS_PROPS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 					&BTRFS_I(inode)->runtime_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		if (need_reserve) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 			btrfs_block_rsv_release(fs_info, trans->block_rsv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 					num_bytes, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		need_reserve = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 			      struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 			      struct inode *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	if (!dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	return inherit_props(trans, inode, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 			       struct btrfs_root *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 			       struct btrfs_root *parent_root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	struct super_block *sb = root->fs_info->sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	struct inode *parent_inode, *child_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	parent_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, parent_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	if (IS_ERR(parent_inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		return PTR_ERR(parent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	child_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	if (IS_ERR(child_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		iput(parent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		return PTR_ERR(child_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	ret = inherit_props(trans, child_inode, parent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	iput(child_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	iput(parent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) void __init btrfs_props_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		struct prop_handler *p = &prop_handlers[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		hash_add(prop_handlers_ht, &p->node, h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)