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From: David Sterba <dsterba@suse.cz>
To: Anand Jain <anand.jain@oracle.com>
Cc: David Sterba <dsterba@suse.com>, linux-btrfs@vger.kernel.org
Subject: Re: [PATCH 3/6] btrfs: introduce try-lock semantics for exclusive op start
Date: Fri, 28 May 2021 14:30:41 +0200	[thread overview]
Message-ID: <20210528123041.GA14136@suse.cz> (raw)
In-Reply-To: <dc12e388-70b9-1349-1e20-85a7fc60d350@oracle.com>

On Thu, May 27, 2021 at 03:43:46PM +0800, Anand Jain wrote:
> On 21/05/2021 20:06, David Sterba wrote:
>   Nit:
>   This function implements a conditional lock. But the function name
>   misleads to some operation similar to spin_trylock() or
>   mutex_trylock(). How about btrfs_exclop_start_cond_lock() instead?

The semantics is same as spin_trylock so it's named like it. Try lock is
a conditional lock so I would not want to cause confusion by using
another naming scheme.

https://elixir.bootlin.com/linux/latest/source/include/linux/spinlock_api_smp.h#L86

static inline int __raw_spin_trylock(raw_spinlock_t *lock)
{
	preempt_disable();
	if (do_raw_spin_trylock(lock)) {
		spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
		return 1;
	}
	preempt_enable();
	return 0;
}

bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
                                enum btrfs_exclusive_operation type)
{
       spin_lock(&fs_info->super_lock);
       if (fs_info->exclusive_operation == type)
               return true;

       spin_unlock(&fs_info->super_lock);
       return false;
}

The code flow is the same.

  reply	other threads:[~2021-05-28 12:33 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-21 12:06 [PATCH 0/6] Support resize and device delete cancel ops David Sterba
2021-05-21 12:06 ` [PATCH 1/6] btrfs: protect exclusive_operation by super_lock David Sterba
2021-05-21 13:37   ` Josef Bacik
2021-05-21 12:06 ` [PATCH 2/6] btrfs: add cancelable chunk relocation support David Sterba
2021-05-21 13:21   ` Josef Bacik
2021-05-26 22:56     ` David Sterba
2021-06-16 13:54   ` Filipe Manana
2021-06-16 13:55     ` Filipe Manana
2021-06-16 15:53       ` David Sterba
2021-06-16 15:58       ` [PATCH v2] btrfs: add cancellable " David Sterba
2021-06-17  9:18         ` Filipe Manana
2021-05-21 12:06 ` [PATCH 3/6] btrfs: introduce try-lock semantics for exclusive op start David Sterba
2021-05-21 13:38   ` Josef Bacik
2021-05-27  7:43   ` Anand Jain
2021-05-28 12:30     ` David Sterba [this message]
2021-05-29 13:48       ` Anand Jain
2021-05-31 18:23         ` David Sterba
2021-05-21 12:06 ` [PATCH 4/6] btrfs: add wrapper for conditional start of exclusive operation David Sterba
2021-05-21 13:29   ` Josef Bacik
2021-05-21 16:45     ` David Sterba
2021-05-26 22:24       ` David Sterba
2021-05-21 12:06 ` [PATCH 5/6] btrfs: add cancelation to resize David Sterba
2021-05-21 13:38   ` Josef Bacik
2021-05-21 12:06 ` [PATCH 6/6] btrfs: add device delete cancel David Sterba
2021-05-21 13:38   ` Josef Bacik
2021-05-21 12:06 ` [PATCH 1/2] btrfs-progs: device remove: add support for cancel David Sterba
2021-05-21 12:06 ` [PATCH 2/2] btrfs-progs: fi resize: " David Sterba
2021-12-14 14:49 ` [PATCH 0/6] Support resize and device delete cancel ops Anand Jain
2021-12-15 15:13   ` David Sterba

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