Btrfs: seperate out btrfs_block_rsv_check out into 2 different functions
Currently btrfs_block_rsv_check does 2 things, it will either refill a block
reserve like in the truncate or refill case, or it will check to see if there is
enough space in the global reserve and possibly refill it. However because of
overcommit we could be well overcommitting ourselves just to try and refill the
global reserve, when really we should just be committing the transaction. So
breack this out into btrfs_block_rsv_refill and btrfs_block_rsv_check. Refill
will try to reserve more metadata if it can and btrfs_block_rsv_check will not,
it will only tell you if the factor of the total space is still reserved.
Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ea60897..2276209 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2252,8 +2252,10 @@
struct btrfs_block_rsv *block_rsv,
u64 num_bytes);
int btrfs_block_rsv_check(struct btrfs_root *root,
+ struct btrfs_block_rsv *block_rsv, int min_factor);
+int btrfs_block_rsv_refill(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv,
- u64 min_reserved, int min_factor, int flush);
+ u64 min_reserved);
int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
struct btrfs_block_rsv *dst_rsv,
u64 num_bytes);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index eb4fe56..a5f1421 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3422,7 +3422,6 @@
* @block_rsv - the block_rsv we're allocating for
* @orig_bytes - the number of bytes we want
* @flush - wether or not we can flush to make our reservation
- * @check - wether this is just to check if we have enough space or not
*
* This will reserve orgi_bytes number of bytes from the space info associated
* with the block_rsv. If there is not enough space it will make an attempt to
@@ -3433,7 +3432,7 @@
*/
static int reserve_metadata_bytes(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv,
- u64 orig_bytes, int flush, int check)
+ u64 orig_bytes, int flush)
{
struct btrfs_space_info *space_info = block_rsv->space_info;
struct btrfs_trans_handle *trans;
@@ -3507,7 +3506,7 @@
(orig_bytes * (retries + 1));
}
- if (ret && !check) {
+ if (ret) {
u64 profile = btrfs_get_alloc_profile(root, 0);
u64 avail;
@@ -3742,7 +3741,7 @@
if (num_bytes == 0)
return 0;
- ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 1, 0);
+ ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 1);
if (!ret) {
block_rsv_add_bytes(block_rsv, num_bytes, 1);
return 0;
@@ -3752,8 +3751,7 @@
}
int btrfs_block_rsv_check(struct btrfs_root *root,
- struct btrfs_block_rsv *block_rsv,
- u64 min_reserved, int min_factor, int flush)
+ struct btrfs_block_rsv *block_rsv, int min_factor)
{
u64 num_bytes = 0;
int ret = -ENOSPC;
@@ -3762,11 +3760,26 @@
return 0;
spin_lock(&block_rsv->lock);
- if (min_factor > 0)
- num_bytes = div_factor(block_rsv->size, min_factor);
- if (min_reserved > num_bytes)
- num_bytes = min_reserved;
+ num_bytes = div_factor(block_rsv->size, min_factor);
+ if (block_rsv->reserved >= num_bytes)
+ ret = 0;
+ spin_unlock(&block_rsv->lock);
+ return ret;
+}
+
+int btrfs_block_rsv_refill(struct btrfs_root *root,
+ struct btrfs_block_rsv *block_rsv,
+ u64 min_reserved)
+{
+ u64 num_bytes = 0;
+ int ret = -ENOSPC;
+
+ if (!block_rsv)
+ return 0;
+
+ spin_lock(&block_rsv->lock);
+ num_bytes = min_reserved;
if (block_rsv->reserved >= num_bytes)
ret = 0;
else
@@ -3776,7 +3789,7 @@
if (!ret)
return 0;
- ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush, !flush);
+ ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 1);
if (!ret) {
block_rsv_add_bytes(block_rsv, num_bytes, 0);
return 0;
@@ -4073,7 +4086,7 @@
to_reserve += calc_csum_metadata_size(inode, num_bytes, 1);
spin_unlock(&BTRFS_I(inode)->lock);
- ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush, 0);
+ ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush);
if (ret) {
u64 to_free = 0;
unsigned dropped;
@@ -5728,7 +5741,7 @@
block_rsv = get_block_rsv(trans, root);
if (block_rsv->size == 0) {
- ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0, 0);
+ ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0);
/*
* If we couldn't reserve metadata bytes try and use some from
* the global reserve.
@@ -5749,7 +5762,7 @@
return block_rsv;
if (ret) {
WARN_ON(1);
- ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0, 0);
+ ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0);
if (!ret) {
return block_rsv;
} else if (ret && block_rsv != global_rsv) {
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 5d40c1e..2fecfc3 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -203,7 +203,7 @@
rsv = trans->block_rsv;
trans->block_rsv = root->orphan_block_rsv;
- ret = btrfs_block_rsv_check(root, root->orphan_block_rsv, 0, 5, 0);
+ ret = btrfs_block_rsv_check(root, root->orphan_block_rsv, 5);
if (ret)
return ret;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b6b70bd..f12747c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3604,7 +3604,7 @@
* doing the truncate.
*/
while (1) {
- ret = btrfs_block_rsv_check(root, rsv, min_size, 0, 1);
+ ret = btrfs_block_rsv_refill(root, rsv, min_size);
/*
* Try and steal from the global reserve since we will
@@ -6613,7 +6613,7 @@
btrfs_add_ordered_operation(trans, root, inode);
while (1) {
- ret = btrfs_block_rsv_check(root, rsv, min_size, 0, 1);
+ ret = btrfs_block_rsv_refill(root, rsv, min_size);
if (ret) {
/*
* This can only happen with the original transaction we
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 7fa090f..10af6a0 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2041,8 +2041,7 @@
BUG_ON(IS_ERR(trans));
trans->block_rsv = rc->block_rsv;
- ret = btrfs_block_rsv_check(root, rc->block_rsv, min_reserved,
- 0, 0);
+ ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved);
if (ret) {
BUG_ON(ret != -EAGAIN);
ret = btrfs_commit_transaction(trans, root);
@@ -3774,8 +3773,7 @@
}
}
- ret = btrfs_block_rsv_check(rc->extent_root, rc->block_rsv, 0,
- 5, 0);
+ ret = btrfs_block_rsv_check(rc->extent_root, rc->block_rsv, 5);
if (ret < 0) {
if (ret != -EAGAIN) {
err = ret;
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index d064fa0..29bef63 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -418,8 +418,8 @@
struct btrfs_root *root)
{
int ret;
- ret = btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 0,
- 5, 0);
+
+ ret = btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5);
return ret ? 1 : 0;
}