u-boot/fs/btrfs/chunk-map.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

177 lines
4 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* BTRFS filesystem implementation for U-Boot
*
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
#include "btrfs.h"
#include <malloc.h>
struct chunk_map_item {
struct rb_node node;
u64 logical;
u64 length;
u64 physical;
};
static int add_chunk_mapping(struct btrfs_key *key, struct btrfs_chunk *chunk)
{
struct btrfs_stripe *stripe;
u64 block_profile = chunk->type & BTRFS_BLOCK_GROUP_PROFILE_MASK;
struct rb_node **new = &(btrfs_info.chunks_root.rb_node), *prnt = NULL;
struct chunk_map_item *map_item;
if (block_profile && block_profile != BTRFS_BLOCK_GROUP_DUP) {
printf("%s: unsupported chunk profile %llu\n", __func__,
block_profile);
return -1;
} else if (!chunk->length) {
printf("%s: zero length chunk\n", __func__);
return -1;
}
stripe = &chunk->stripe;
btrfs_stripe_to_cpu(stripe);
while (*new) {
struct chunk_map_item *this;
this = rb_entry(*new, struct chunk_map_item, node);
prnt = *new;
if (key->offset < this->logical) {
new = &((*new)->rb_left);
} else if (key->offset > this->logical) {
new = &((*new)->rb_right);
} else {
debug("%s: Logical address %llu already in map!\n",
__func__, key->offset);
return 0;
}
}
map_item = malloc(sizeof(struct chunk_map_item));
if (!map_item)
return -1;
map_item->logical = key->offset;
map_item->length = chunk->length;
map_item->physical = le64_to_cpu(chunk->stripe.offset);
rb_link_node(&map_item->node, prnt, new);
rb_insert_color(&map_item->node, &btrfs_info.chunks_root);
debug("%s: Mapping %llu to %llu\n", __func__, map_item->logical,
map_item->physical);
return 0;
}
u64 btrfs_map_logical_to_physical(u64 logical)
{
struct rb_node *node = btrfs_info.chunks_root.rb_node;
while (node) {
struct chunk_map_item *item;
item = rb_entry(node, struct chunk_map_item, node);
if (item->logical > logical)
node = node->rb_left;
else if (logical > item->logical + item->length)
node = node->rb_right;
else
return item->physical + logical - item->logical;
}
printf("%s: Cannot map logical address %llu to physical\n", __func__,
logical);
return -1ULL;
}
void btrfs_chunk_map_exit(void)
{
struct rb_node *now, *next;
struct chunk_map_item *item;
for (now = rb_first_postorder(&btrfs_info.chunks_root); now; now = next)
{
item = rb_entry(now, struct chunk_map_item, node);
next = rb_next_postorder(now);
free(item);
}
}
int btrfs_chunk_map_init(void)
{
u8 sys_chunk_array_copy[sizeof(btrfs_info.sb.sys_chunk_array)];
u8 * const start = sys_chunk_array_copy;
u8 * const end = start + btrfs_info.sb.sys_chunk_array_size;
u8 *cur;
struct btrfs_key *key;
struct btrfs_chunk *chunk;
btrfs_info.chunks_root = RB_ROOT;
memcpy(sys_chunk_array_copy, btrfs_info.sb.sys_chunk_array,
sizeof(sys_chunk_array_copy));
for (cur = start; cur < end;) {
key = (struct btrfs_key *) cur;
cur += sizeof(struct btrfs_key);
chunk = (struct btrfs_chunk *) cur;
btrfs_key_to_cpu(key);
btrfs_chunk_to_cpu(chunk);
if (key->type != BTRFS_CHUNK_ITEM_KEY) {
printf("%s: invalid key type %u\n", __func__,
key->type);
return -1;
}
if (add_chunk_mapping(key, chunk))
return -1;
cur += sizeof(struct btrfs_chunk);
cur += sizeof(struct btrfs_stripe) * (chunk->num_stripes - 1);
}
return 0;
}
int btrfs_read_chunk_tree(void)
{
struct btrfs_path path;
struct btrfs_key key, *found_key;
struct btrfs_chunk *chunk;
int res = 0;
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.type = BTRFS_CHUNK_ITEM_KEY;
key.offset = 0;
if (btrfs_search_tree(&btrfs_info.chunk_root, &key, &path))
return -1;
do {
found_key = btrfs_path_leaf_key(&path);
if (btrfs_comp_keys_type(&key, found_key))
break;
chunk = btrfs_path_item_ptr(&path, struct btrfs_chunk);
btrfs_chunk_to_cpu(chunk);
if (add_chunk_mapping(found_key, chunk)) {
res = -1;
break;
}
} while (!(res = btrfs_next_slot(&path)));
btrfs_free_path(&path);
if (res < 0)
return -1;
return 0;
}