Attachment 655735 Details for Bug 950178

[patch] btrfs kernel patch

0001-Btrfs-use-global-reserve-when-deleting-unused-block-.patch (text/plain), 1.73 KB, created by Filipe Manana on 2015-11-12 17:58:58 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Filipe Manana

Created: 2015-11-12 17:58:58 UTC

Size: 1.73 KB

patch

obsolete

>From 55257cf0153d0ae74a8f5e0e276b3b2322fbef7d Mon Sep 17 00:00:00 2001
>From: Filipe Manana <fdmanana@suse.com>
>Date: Thu, 12 Nov 2015 17:49:45 +0000
>Subject: [PATCH] Btrfs: use global reserve when deleting unused block group
> after ENOSPC
>
>It's possible to reach a state where the cleaner kthread isn't able to
>start a transaction to delete an unused block group due to lack of enough
>metadata space. If this happens try to use space from the global block
>group reserve just like we do for unlink operations.
>
>Signed-off-by: Filipe Manana <fdmanana@suse.com>
>---
> fs/btrfs/extent-tree.c | 21 ++++++++++++++++++++-
> 1 file changed, 20 insertions(+), 1 deletion(-)
>
>diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
>index acf3ed1..dfc9a3e 100644
>--- a/fs/btrfs/extent-tree.c
>+++ b/fs/btrfs/extent-tree.c
>@@ -10324,7 +10324,26 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
> 		 */
> 		/* 1 for btrfs_orphan_reserve_metadata() */
> 		trans = btrfs_start_transaction(root, 1);
>-		if (IS_ERR(trans)) {
>+		if (IS_ERR(trans) && PTR_ERR(trans) == -ENOSPC) {
>+			u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1);
>+
>+			trans = btrfs_start_transaction(root, 0);
>+			if (IS_ERR(trans)) {
>+				btrfs_dec_block_group_ro(root, block_group);
>+				ret = PTR_ERR(trans);
>+				goto next;
>+			}
>+			ret = btrfs_cond_migrate_bytes(fs_info,
>+						       &fs_info->trans_block_rsv,
>+						       num_bytes, 1);
>+			if (ret) {
>+				btrfs_dec_block_group_ro(root, block_group);
>+				ret = PTR_ERR(trans);
>+				goto end_trans;
>+			}
>+			trans->block_rsv = &root->fs_info->trans_block_rsv;
>+			trans->bytes_reserved = num_bytes;
>+		} else if (IS_ERR(trans)) {
> 			btrfs_dec_block_group_ro(root, block_group);
> 			ret = PTR_ERR(trans);
> 			goto next;
>-- 
>2.1.3
>

Actions: View | Diff

Attachments on bug 950178: 655735