* [PATCH] btrfs: remove trivial nowait check
@ 2020-02-01 3:51 qiwuchen55
2020-02-06 17:17 ` David Sterba
0 siblings, 1 reply; 2+ messages in thread
From: qiwuchen55 @ 2020-02-01 3:51 UTC (permalink / raw)
To: clm, josef, dsterba, trivial; +Cc: linux-btrfs, chenqiwu
From: chenqiwu <chenqiwu@xiaomi.com>
Remove trivial nowait check for btrfs_file_write_iter(),
since buffered writes will return -EINVAL if IOCB_NOWAIT
passed in the follow-up function generic_write_checks().
Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
---
fs/btrfs/file.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index a16da27..320af95 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1896,10 +1896,6 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
loff_t oldsize;
int clean_page = 0;
- if (!(iocb->ki_flags & IOCB_DIRECT) &&
- (iocb->ki_flags & IOCB_NOWAIT))
- return -EOPNOTSUPP;
-
if (iocb->ki_flags & IOCB_NOWAIT) {
if (!inode_trylock(inode))
return -EAGAIN;
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] btrfs: remove trivial nowait check
2020-02-01 3:51 [PATCH] btrfs: remove trivial nowait check qiwuchen55
@ 2020-02-06 17:17 ` David Sterba
0 siblings, 0 replies; 2+ messages in thread
From: David Sterba @ 2020-02-06 17:17 UTC (permalink / raw)
To: qiwuchen55; +Cc: clm, josef, dsterba, trivial, linux-btrfs, chenqiwu
On Sat, Feb 01, 2020 at 11:51:33AM +0800, qiwuchen55@gmail.com wrote:
> From: chenqiwu <chenqiwu@xiaomi.com>
>
> Remove trivial nowait check for btrfs_file_write_iter(),
> since buffered writes will return -EINVAL if IOCB_NOWAIT
> passed in the follow-up function generic_write_checks().
>
> Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
> ---
> fs/btrfs/file.c | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
> index a16da27..320af95 100644
> --- a/fs/btrfs/file.c
> +++ b/fs/btrfs/file.c
> @@ -1896,10 +1896,6 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
> loff_t oldsize;
> int clean_page = 0;
>
> - if (!(iocb->ki_flags & IOCB_DIRECT) &&
> - (iocb->ki_flags & IOCB_NOWAIT))
> - return -EOPNOTSUPP;
This returns a different error code for the condition than
generic_write_checks, and is checked without the inode lock. I'm not
sure if we should remove it, it's a fast-fail path for buffered+nowait,
that probably does not happen that often.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-02-01 3:51 [PATCH] btrfs: remove trivial nowait check qiwuchen55
2020-02-06 17:17 ` David Sterba
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