Josef Bacik
2009-Feb-19 18:13 UTC
[PATCH] 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>
---
fs/btrfs/extent-tree.c | 57 +++++++++++++++++++++++++++++++++++++++--------
1 files changed, 47 insertions(+), 10 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 22cedbd..d4bdb2a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2270,26 +2270,49 @@ 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);
@@ -2305,7 +2328,7 @@ 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);
@@ -2318,13 +2341,14 @@ 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);
@@ -2343,6 +2367,19 @@ 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"
--
1.5.4.3
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