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btrfs: use btrfs_try_granting_tickets in update_global_rsv 

We have some annoying xfstests tests that will create a very small fs,
fill it up, delete it, and repeat to make sure everything works right.
This trips btrfs up sometimes because we may commit a transaction to
free space, but most of the free metadata space was being reserved by
the global reserve.  So we commit and update the global reserve, but the
space is simply added to bytes_may_use directly, instead of trying to
add it to existing tickets.  This results in ENOSPC when we really did
have space.  Fix this by calling btrfs_try_granting_tickets once we add
back our excess space to wake any pending tickets.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2019-08-22 15:19:02 -04:00 committed by David Sterba
parent d792b0f197
commit 426551f686
1 changed files with 1 additions and 0 deletions
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1
fs/btrfs/block-rsv.c
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@ -305,6 +305,7 @@ void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info)
btrfs_space_info_update_bytes_may_use(fs_info, sinfo,
-num_bytes);
block_rsv->reserved = block_rsv->size;
btrfs_try_granting_tickets(fs_info, sinfo);
}
if (block_rsv->reserved == block_rsv->size)