nings on several nodes in our ceph cluster.
>
> Before the warning there is an additional block rsv -28 message, but
> there is plenty of free space on the disk.
>
>
> [201653.774412] btrfs: block rsv returned -28
> [201653.774415] [ cut here ]--------
> [201
d -28
[201653.774415] [ cut here ]
[201653.779846] WARNING: at fs/btrfs/extent-tree.c:5980
btrfs_alloc_free_block+0x347/0x360 [btrfs]()
The complte trace is here:
http://pastebin.com/0SFeZReg
The extent-tree.c:5980 is in use_block_rsv():
5974 if (ret) {
