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btrfs-progs: extent-tree: Introduce functions to free in-memory block group cache 

Introduce two functions, free_space_info and free_block_group_cache.

The former will free the space of a empty block group.
The latter will free the in memory block group cache along with its
space in space_info and device space.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2015-07-07 16:15:26 +08:00 committed by David Sterba
parent 1da859012b
commit 00827cad8e
1 changed files with 101 additions and 0 deletions
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101
extent-tree.c
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@ -1801,6 +1801,31 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
}
static int free_space_info(struct btrfs_fs_info *fs_info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info)
{
struct btrfs_space_info *found;
/* only support free block group which is empty */
if (bytes_used)
return -ENOTEMPTY;
found = __find_space_info(fs_info, flags);
if (!found)
return -ENOENT;
if (found->total_bytes < total_bytes) {
fprintf(stderr,
"WARNING: bad space info to free %llu only have %llu\n",
total_bytes, found->total_bytes);
return -EINVAL;
}
found->total_bytes -= total_bytes;
if (space_info)
*space_info = found;
return 0;
}
static int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info)
@ -3642,6 +3667,82 @@ out:
return ret;
}
static u64 get_dev_extent_len(struct map_lookup *map)
{
int div;
switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
case 0: /* Single */
case BTRFS_BLOCK_GROUP_DUP:
case BTRFS_BLOCK_GROUP_RAID1:
div = 1;
break;
case BTRFS_BLOCK_GROUP_RAID5:
div = (map->num_stripes - 1);
break;
case BTRFS_BLOCK_GROUP_RAID6:
div = (map->num_stripes - 2);
break;
case BTRFS_BLOCK_GROUP_RAID10:
div = (map->num_stripes / map->sub_stripes);
break;
default:
/* normally, read chunk security hook should handled it */
BUG_ON(1);
}
return map->ce.size / div;
}
/* free block group/chunk related caches */
static int free_block_group_cache(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 bytenr, u64 len)
{
struct btrfs_block_group_cache *cache;
struct cache_extent *ce;
struct map_lookup *map;
int ret;
int i;
u64 flags;
/* Free block group cache first */
cache = btrfs_lookup_block_group(fs_info, bytenr);
if (!cache)
return -ENOENT;
flags = cache->flags;
if (cache->free_space_ctl) {
btrfs_remove_free_space_cache(cache);
kfree(cache->free_space_ctl);
}
clear_extent_bits(&fs_info->block_group_cache, bytenr, bytenr + len,
(unsigned int)-1, GFP_NOFS);
ret = free_space_info(fs_info, flags, len, 0, NULL);
if (ret < 0)
goto out;
kfree(cache);
/* Then free mapping info and dev usage info */
ce = search_cache_extent(&fs_info->mapping_tree.cache_tree, bytenr);
if (!ce || ce->start != bytenr) {
ret = -ENOENT;
goto out;
}
map = container_of(ce, struct map_lookup, ce);
for (i = 0; i < map->num_stripes; i++) {
struct btrfs_device *device;
device = map->stripes[i].dev;
device->bytes_used -= get_dev_extent_len(map);
ret = btrfs_update_device(trans, device);
if (ret < 0)
goto out;
}
remove_cache_extent(&fs_info->mapping_tree.cache_tree, ce);
free(map);
out:
return ret;
}
/*
* Fixup block accounting. The initial block accounting created by
* make_block_groups isn't accuracy in this case.