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Btrfs: Introduce global metadata reservation

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Reserve metadata space for extent tree, checksum tree and root tree

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng
2010-05-16 10:49:58 -04:00
committed by Chris Mason
parent 0ca1f7ceb1
commit 8929ecfa50
8 changed files with 242 additions and 77 deletions
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149
fs/btrfs/extent-tree.c
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@@ -2895,10 +2895,9 @@ int btrfs_check_data_free_space(struct inode *inode, u64 bytes)
again:
/* make sure we have enough space to handle the data first */
spin_lock(&data_sinfo->lock);
used = data_sinfo->bytes_used + data_sinfo->bytes_delalloc +
data_sinfo->bytes_reserved + data_sinfo->bytes_pinned +
data_sinfo->bytes_readonly + data_sinfo->bytes_may_use +
data_sinfo->bytes_super;
used = data_sinfo->bytes_used + data_sinfo->bytes_reserved +
data_sinfo->bytes_pinned + data_sinfo->bytes_readonly +
data_sinfo->bytes_may_use;
if (used + bytes > data_sinfo->total_bytes) {
struct btrfs_trans_handle *trans;
@@ -2922,7 +2921,7 @@ alloc:
bytes + 2 * 1024 * 1024,
alloc_target, 0);
btrfs_end_transaction(trans, root);
if (ret)
if (ret < 0)
return ret;
if (!data_sinfo) {
@@ -2945,11 +2944,10 @@ alloc:
goto again;
}
printk(KERN_ERR "no space left, need %llu, %llu delalloc bytes"
", %llu bytes_used, %llu bytes_reserved, "
"%llu bytes_pinned, %llu bytes_readonly, %llu may use "
"%llu total\n", (unsigned long long)bytes,
(unsigned long long)data_sinfo->bytes_delalloc,
printk(KERN_ERR "no space left, need %llu, %llu bytes_used, "
"%llu bytes_reserved, " "%llu bytes_pinned, "
"%llu bytes_readonly, %llu may use %llu total\n",
(unsigned long long)bytes,
(unsigned long long)data_sinfo->bytes_used,
(unsigned long long)data_sinfo->bytes_reserved,
(unsigned long long)data_sinfo->bytes_pinned,
@@ -3464,6 +3462,91 @@ void btrfs_block_rsv_release(struct btrfs_root *root,
block_rsv_release_bytes(block_rsv, global_rsv, num_bytes);
}
/*
* helper to calculate size of global block reservation.
* the desired value is sum of space used by extent tree,
* checksum tree and root tree
*/
static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info)
{
struct btrfs_space_info *sinfo;
u64 num_bytes;
u64 meta_used;
u64 data_used;
int csum_size = btrfs_super_csum_size(&fs_info->super_copy);
#if 0
/*
* per tree used space accounting can be inaccuracy, so we
* can't rely on it.
*/
spin_lock(&fs_info->extent_root->accounting_lock);
num_bytes = btrfs_root_used(&fs_info->extent_root->root_item);
spin_unlock(&fs_info->extent_root->accounting_lock);
spin_lock(&fs_info->csum_root->accounting_lock);
num_bytes += btrfs_root_used(&fs_info->csum_root->root_item);
spin_unlock(&fs_info->csum_root->accounting_lock);
spin_lock(&fs_info->tree_root->accounting_lock);
num_bytes += btrfs_root_used(&fs_info->tree_root->root_item);
spin_unlock(&fs_info->tree_root->accounting_lock);
#endif
sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA);
spin_lock(&sinfo->lock);
data_used = sinfo->bytes_used;
spin_unlock(&sinfo->lock);
sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
spin_lock(&sinfo->lock);
meta_used = sinfo->bytes_used;
spin_unlock(&sinfo->lock);
num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) *
csum_size * 2;
num_bytes += div64_u64(data_used + meta_used, 50);
if (num_bytes * 3 > meta_used)
num_bytes = div64_u64(meta_used, 3);
return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10);
}
static void update_global_block_rsv(struct btrfs_fs_info *fs_info)
{
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
struct btrfs_space_info *sinfo = block_rsv->space_info;
u64 num_bytes;
num_bytes = calc_global_metadata_size(fs_info);
spin_lock(&block_rsv->lock);
spin_lock(&sinfo->lock);
block_rsv->size = num_bytes;
num_bytes = sinfo->bytes_used + sinfo->bytes_pinned +
sinfo->bytes_reserved + sinfo->bytes_readonly;
if (sinfo->total_bytes > num_bytes) {
num_bytes = sinfo->total_bytes - num_bytes;
block_rsv->reserved += num_bytes;
sinfo->bytes_reserved += num_bytes;
}
if (block_rsv->reserved >= block_rsv->size) {
num_bytes = block_rsv->reserved - block_rsv->size;
sinfo->bytes_reserved -= num_bytes;
block_rsv->reserved = block_rsv->size;
block_rsv->full = 1;
}
#if 0
printk(KERN_INFO"global block rsv size %llu reserved %llu\n",
block_rsv->size, block_rsv->reserved);
#endif
spin_unlock(&sinfo->lock);
spin_unlock(&block_rsv->lock);
}
static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
{
struct btrfs_space_info *space_info;
@@ -3473,11 +3556,36 @@ static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
fs_info->chunk_block_rsv.priority = 10;
space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
fs_info->global_block_rsv.space_info = space_info;
fs_info->global_block_rsv.priority = 10;
fs_info->global_block_rsv.refill_used = 1;
fs_info->delalloc_block_rsv.space_info = space_info;
fs_info->trans_block_rsv.space_info = space_info;
fs_info->empty_block_rsv.space_info = space_info;
fs_info->empty_block_rsv.priority = 10;
fs_info->extent_root->block_rsv = &fs_info->global_block_rsv;
fs_info->csum_root->block_rsv = &fs_info->global_block_rsv;
fs_info->dev_root->block_rsv = &fs_info->global_block_rsv;
fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;
fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;
btrfs_add_durable_block_rsv(fs_info, &fs_info->global_block_rsv);
btrfs_add_durable_block_rsv(fs_info, &fs_info->delalloc_block_rsv);
update_global_block_rsv(fs_info);
}
static void release_global_block_rsv(struct btrfs_fs_info *fs_info)
{
block_rsv_release_bytes(&fs_info->global_block_rsv, NULL, (u64)-1);
WARN_ON(fs_info->delalloc_block_rsv.size > 0);
WARN_ON(fs_info->delalloc_block_rsv.reserved > 0);
WARN_ON(fs_info->trans_block_rsv.size > 0);
WARN_ON(fs_info->trans_block_rsv.reserved > 0);
WARN_ON(fs_info->chunk_block_rsv.size > 0);
WARN_ON(fs_info->chunk_block_rsv.reserved > 0);
}
static u64 calc_trans_metadata_size(struct btrfs_root *root, int num_items)
@@ -3826,6 +3934,8 @@ int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
fs_info->pinned_extents = &fs_info->freed_extents[0];
up_write(&fs_info->extent_commit_sem);
update_global_block_rsv(fs_info);
return 0;
}
@@ -4818,19 +4928,16 @@ static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
printk(KERN_INFO "space_info has %llu free, is %sfull\n",
(unsigned long long)(info->total_bytes - info->bytes_used -
info->bytes_pinned - info->bytes_reserved -
info->bytes_super),
info->bytes_readonly),
(info->full) ? "" : "not ");
printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu,"
" may_use=%llu, used=%llu, root=%llu, super=%llu, reserved=%llu"
"\n",
printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, "
"reserved=%llu, may_use=%llu, readonly=%llu\n",
(unsigned long long)info->total_bytes,
(unsigned long long)info->bytes_pinned,
(unsigned long long)info->bytes_delalloc,
(unsigned long long)info->bytes_may_use,
(unsigned long long)info->bytes_used,
(unsigned long long)info->bytes_root,
(unsigned long long)info->bytes_super,
(unsigned long long)info->bytes_reserved);
(unsigned long long)info->bytes_pinned,
(unsigned long long)info->bytes_reserved,
(unsigned long long)info->bytes_may_use,
(unsigned long long)info->bytes_readonly);
spin_unlock(&info->lock);
if (!dump_block_groups)
@@ -7727,6 +7834,8 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
*/
synchronize_rcu();
release_global_block_rsv(info);
while(!list_empty(&info->space_info)) {
space_info = list_entry(info->space_info.next,
struct btrfs_space_info,