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authorJosef Bacik <jbacik@redhat.com>2009-02-20 10:59:53 -0500
committerChris Mason <chris.mason@oracle.com>2009-02-20 10:59:53 -0500
commit4e06bdd6cbd5105376e7caf4e683ed131e777389 (patch)
tree20a7b891f7f8f518eb2cd81234e0c9ab5902c6c3 /fs
parent6a63209fc02d5483371f07e4913ee8abad608051 (diff)
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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>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent-tree.c57
1 files changed, 47 insertions, 10 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e11875e..6b5966a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -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"