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Btrfs: stop passing a trans handle all around the reservation code

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The only thing that we need to have a trans handle for is in
reserve_metadata_bytes and thats to know how much flushing we can do.  So
instead of passing it around, just check current->journal_info for a
trans_handle so we know if we can commit a transaction to try and free up space
or not.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik
2011-08-30 12:34:28 -04:00
parent d02c9955de
commit 4a92b1b8d2
6 changed files with 39 additions and 43 deletions
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45
fs/btrfs/extent-tree.c
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@@ -3404,29 +3404,34 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans,
return reclaimed >= to_reclaim;
}
/*
* Retries tells us how many times we've called reserve_metadata_bytes. The
* idea is if this is the first call (retries == 0) then we will add to our
* reserved count if we can't make the allocation in order to hold our place
* while we go and try and free up space. That way for retries > 1 we don't try
* and add space, we just check to see if the amount of unused space is >= the
* total space, meaning that our reservation is valid.
/**
* reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
* @root - the root we're allocating for
* @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
*
* However if we don't intend to retry this reservation, pass -1 as retries so
* that it short circuits this logic.
* 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
* flush out space to make room. It will do this by flushing delalloc if
* possible or committing the transaction. If flush is 0 then no attempts to
* regain reservations will be made and this will fail if there is not enough
* space already.
*/
static int reserve_metadata_bytes(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
static int reserve_metadata_bytes(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv,
u64 orig_bytes, int flush)
{
struct btrfs_space_info *space_info = block_rsv->space_info;
struct btrfs_trans_handle *trans;
u64 unused;
u64 num_bytes = orig_bytes;
int retries = 0;
int ret = 0;
bool committed = false;
bool flushing = false;
trans = (struct btrfs_trans_handle *)current->journal_info;
again:
ret = 0;
spin_lock(&space_info->lock);
@@ -3689,8 +3694,7 @@ void btrfs_free_block_rsv(struct btrfs_root *root,
kfree(rsv);
}
int btrfs_block_rsv_add(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
int btrfs_block_rsv_add(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv,
u64 num_bytes)
{
@@ -3699,7 +3703,7 @@ int btrfs_block_rsv_add(struct btrfs_trans_handle *trans,
if (num_bytes == 0)
return 0;
ret = reserve_metadata_bytes(trans, root, block_rsv, num_bytes, 1);
ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 1);
if (!ret) {
block_rsv_add_bytes(block_rsv, num_bytes, 1);
return 0;
@@ -3708,8 +3712,7 @@ int btrfs_block_rsv_add(struct btrfs_trans_handle *trans,
return ret;
}
int btrfs_block_rsv_check(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
int btrfs_block_rsv_check(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv,
u64 min_reserved, int min_factor, int flush)
{
@@ -3734,7 +3737,7 @@ int btrfs_block_rsv_check(struct btrfs_trans_handle *trans,
if (!ret)
return 0;
ret = reserve_metadata_bytes(trans, root, block_rsv, num_bytes, flush);
ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
if (!ret) {
block_rsv_add_bytes(block_rsv, num_bytes, 0);
return 0;
@@ -4034,7 +4037,7 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
to_reserve += calc_csum_metadata_size(inode, num_bytes, 1);
spin_unlock(&BTRFS_I(inode)->lock);
ret = reserve_metadata_bytes(NULL, root, block_rsv, to_reserve, flush);
ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush);
if (ret) {
u64 to_free = 0;
unsigned dropped;
@@ -5689,8 +5692,7 @@ use_block_rsv(struct btrfs_trans_handle *trans,
block_rsv = get_block_rsv(trans, root);
if (block_rsv->size == 0) {
ret = reserve_metadata_bytes(trans, root, block_rsv,
blocksize, 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.
@@ -5711,8 +5713,7 @@ use_block_rsv(struct btrfs_trans_handle *trans,
return block_rsv;
if (ret) {
WARN_ON(1);
ret = reserve_metadata_bytes(trans, root, block_rsv, blocksize,
0);
ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0);
if (!ret) {
return block_rsv;
} else if (ret && block_rsv != global_rsv) {