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-rw-r--r--fs/btrfs/ctree.h3
-rw-r--r--fs/btrfs/disk-io.c1
-rw-r--r--fs/btrfs/extent-tree.c28
-rw-r--r--fs/btrfs/super.c12
4 files changed, 42 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ad96495dedc5..213535f45da2 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -881,6 +881,9 @@ struct btrfs_fs_info {
u64 metadata_alloc_profile;
u64 system_alloc_profile;
+ unsigned data_chunk_allocations;
+ unsigned metadata_ratio;
+
void *bdev_holder;
};
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a6b83744b05d..44c94d808e2b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1604,6 +1604,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->btree_inode = new_inode(sb);
fs_info->btree_inode->i_ino = 1;
fs_info->btree_inode->i_nlink = 1;
+ fs_info->metadata_ratio = 8;
fs_info->thread_pool_size = min_t(unsigned long,
num_online_cpus() + 2, 8);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 178df4c67de4..2895a8373232 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1918,15 +1918,29 @@ void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
spin_unlock(&info->lock);
}
+static void force_metadata_allocation(struct btrfs_fs_info *info)
+{
+ struct list_head *head = &info->space_info;
+ struct btrfs_space_info *found;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(found, head, list) {
+ if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
+ found->force_alloc = 1;
+ }
+ rcu_read_unlock();
+}
+
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
u64 flags, int force)
{
struct btrfs_space_info *space_info;
+ struct btrfs_fs_info *fs_info = extent_root->fs_info;
u64 thresh;
int ret = 0;
- mutex_lock(&extent_root->fs_info->chunk_mutex);
+ mutex_lock(&fs_info->chunk_mutex);
flags = btrfs_reduce_alloc_profile(extent_root, flags);
@@ -1958,6 +1972,18 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
}
spin_unlock(&space_info->lock);
+ /*
+ * if we're doing a data chunk, go ahead and make sure that
+ * we keep a reasonable number of metadata chunks allocated in the
+ * FS as well.
+ */
+ if (flags & BTRFS_BLOCK_GROUP_DATA) {
+ fs_info->data_chunk_allocations++;
+ if (!(fs_info->data_chunk_allocations %
+ fs_info->metadata_ratio))
+ force_metadata_allocation(fs_info);
+ }
+
ret = btrfs_alloc_chunk(trans, extent_root, flags);
if (ret)
space_info->full = 1;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 9744af9d71e9..30c9a8ca2a54 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -68,7 +68,7 @@ enum {
Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_notreelog,
- Opt_flushoncommit, Opt_err,
+ Opt_ratio, Opt_flushoncommit, Opt_err,
};
static match_table_t tokens = {
@@ -87,6 +87,7 @@ static match_table_t tokens = {
{Opt_noacl, "noacl"},
{Opt_notreelog, "notreelog"},
{Opt_flushoncommit, "flushoncommit"},
+ {Opt_ratio, "metadata_ratio=%d"},
{Opt_err, NULL},
};
@@ -234,6 +235,15 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
printk(KERN_INFO "btrfs: turning on flush-on-commit\n");
btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
break;
+ case Opt_ratio:
+ intarg = 0;
+ match_int(&args[0], &intarg);
+ if (intarg) {
+ info->metadata_ratio = intarg;
+ printk(KERN_INFO "btrfs: metadata ratio %d\n",
+ info->metadata_ratio);
+ }
+ break;
default:
break;
}