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Btrfs: try committing transaction before returning ENOSPC 

This fixes a problem where we could return -ENOSPC when we may actually have
plenty of space, the space is just pinned.  Instead of returning -ENOSPC
immediately, commit the transaction first and then try and do the allocation
again.

This patch also does chunk allocation for metadata if we pass the 80%
threshold for metadata space.  This will help with stack usage since the chunk
allocation will happen early on, instead of when the allocation is happening.

Signed-off-by: Josef Bacik <jbacik@redhat.com>
This commit is contained in:
Josef Bacik 2009-02-20 10:59:53 -05:00 committed by Chris Mason
parent 6a63209fc0
commit 4e06bdd6cb
1 changed files with 47 additions and 10 deletions
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57
fs/btrfs/extent-tree.c
View File

@ -2017,26 +2017,49 @@ int btrfs_check_metadata_free_space(struct btrfs_root *root)
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_space_info *meta_sinfo;
u64 alloc_target, thresh;
int committed = 0, ret;
/* get the space info for where the metadata will live */
alloc_target = btrfs_get_alloc_profile(root, 0);
meta_sinfo = __find_space_info(info, alloc_target);
/*
* if the metadata area isn't maxed out then there is no sense in
* checking how much is used, since we can always allocate a new chunk
*/
if (!meta_sinfo->full)
return 0;
again:
spin_lock(&meta_sinfo->lock);
thresh = meta_sinfo->total_bytes * 95;
if (!meta_sinfo->full)
thresh = meta_sinfo->total_bytes * 80;
else
thresh = meta_sinfo->total_bytes * 95;
do_div(thresh, 100);
if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) {
struct btrfs_trans_handle *trans;
if (!meta_sinfo->full) {
meta_sinfo->force_alloc = 1;
spin_unlock(&meta_sinfo->lock);
trans = btrfs_start_transaction(root, 1);
if (!trans)
return -ENOMEM;
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
2 * 1024 * 1024, alloc_target, 0);
btrfs_end_transaction(trans, root);
goto again;
}
spin_unlock(&meta_sinfo->lock);
if (!committed) {
committed = 1;
trans = btrfs_join_transaction(root, 1);
if (!trans)
return -ENOMEM;
ret = btrfs_commit_transaction(trans, root);
if (ret)
return ret;
goto again;
}
return -ENOSPC;
}
spin_unlock(&meta_sinfo->lock);
@ -2052,7 +2075,7 @@ int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
u64 bytes)
{
struct btrfs_space_info *data_sinfo;
int ret = 0;
int ret = 0, committed = 0;
/* make sure bytes are sectorsize aligned */
bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
@ -2065,13 +2088,14 @@ again:
data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved -
data_sinfo->bytes_pinned - data_sinfo->bytes_readonly -
data_sinfo->bytes_may_use < bytes) {
struct btrfs_trans_handle *trans;
/*
* if we don't have enough free bytes in this space then we need
* to alloc a new chunk.
*/
if (!data_sinfo->full) {
u64 alloc_target;
struct btrfs_trans_handle *trans;
data_sinfo->force_alloc = 1;
spin_unlock(&data_sinfo->lock);
@ -2090,6 +2114,19 @@ again:
goto again;
}
spin_unlock(&data_sinfo->lock);
/* commit the current transaction and try again */
if (!committed) {
committed = 1;
trans = btrfs_join_transaction(root, 1);
if (!trans)
return -ENOMEM;
ret = btrfs_commit_transaction(trans, root);
if (ret)
return ret;
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"