* [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page
@ 2019-01-28 12:31 zhengbin
2019-01-28 12:31 ` zhengbin
2019-01-28 20:18 ` Matthew Wilcox
0 siblings, 2 replies; 6+ messages in thread
From: zhengbin @ 2019-01-28 12:31 UTC (permalink / raw)
To: akpm, willy, darrick.wong, amir73il, david, hannes, jrdr.linux,
hughd, linux-mm
Cc: houtao1, yi.zhang, zhengbin13
The 'end_byte' parameter of filemap_range_has_page is required to be
inclusive, so follow the rule.
Signed-off-by: zhengbin <zhengbin13@huawei.com>
---
mm/filemap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 9f5e323..a236bf3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3081,7 +3081,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
if (iocb->ki_flags & IOCB_NOWAIT) {
/* If there are pages to writeback, return */
if (filemap_range_has_page(inode->i_mapping, pos,
- pos + write_len))
+ pos + write_len - 1))
return -EAGAIN;
} else {
written = filemap_write_and_wait_range(mapping, pos,
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page
2019-01-28 12:31 [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page zhengbin
@ 2019-01-28 12:31 ` zhengbin
2019-01-28 20:18 ` Matthew Wilcox
1 sibling, 0 replies; 6+ messages in thread
From: zhengbin @ 2019-01-28 12:31 UTC (permalink / raw)
To: akpm, willy, darrick.wong, amir73il, david, hannes, jrdr.linux,
hughd, linux-mm
Cc: houtao1, yi.zhang, zhengbin13
The 'end_byte' parameter of filemap_range_has_page is required to be
inclusive, so follow the rule.
Signed-off-by: zhengbin <zhengbin13@huawei.com>
---
mm/filemap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 9f5e323..a236bf3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3081,7 +3081,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
if (iocb->ki_flags & IOCB_NOWAIT) {
/* If there are pages to writeback, return */
if (filemap_range_has_page(inode->i_mapping, pos,
- pos + write_len))
+ pos + write_len - 1))
return -EAGAIN;
} else {
written = filemap_write_and_wait_range(mapping, pos,
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page
2019-01-28 12:31 [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page zhengbin
2019-01-28 12:31 ` zhengbin
@ 2019-01-28 20:18 ` Matthew Wilcox
2019-02-01 7:43 ` Christoph Hellwig
1 sibling, 1 reply; 6+ messages in thread
From: Matthew Wilcox @ 2019-01-28 20:18 UTC (permalink / raw)
To: zhengbin
Cc: Goldwyn Rodrigues, Christoph Hellwig, Jan Kara, Jens Axboe, akpm,
darrick.wong, amir73il, david, hannes, jrdr.linux, hughd,
linux-mm, houtao1, yi.zhang
On Mon, Jan 28, 2019 at 08:31:19PM +0800, zhengbin wrote:
> The 'end_byte' parameter of filemap_range_has_page is required to be
> inclusive, so follow the rule.
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Fixes: 6be96d3ad34a ("fs: return if direct I/O will trigger writeback")
Adding the people in the sign-off chain to the Cc.
> Signed-off-by: zhengbin <zhengbin13@huawei.com>
> ---
> mm/filemap.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 9f5e323..a236bf3 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -3081,7 +3081,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
> if (iocb->ki_flags & IOCB_NOWAIT) {
> /* If there are pages to writeback, return */
> if (filemap_range_has_page(inode->i_mapping, pos,
> - pos + write_len))
> + pos + write_len - 1))
> return -EAGAIN;
> } else {
> written = filemap_write_and_wait_range(mapping, pos,
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page
2019-01-28 20:18 ` Matthew Wilcox
@ 2019-02-01 7:43 ` Christoph Hellwig
2019-02-01 15:14 ` Jens Axboe
2019-02-01 19:32 ` Matthew Wilcox
0 siblings, 2 replies; 6+ messages in thread
From: Christoph Hellwig @ 2019-02-01 7:43 UTC (permalink / raw)
To: Matthew Wilcox
Cc: zhengbin, Goldwyn Rodrigues, Christoph Hellwig, Jan Kara,
Jens Axboe, akpm, darrick.wong, amir73il, david, hannes,
jrdr.linux, hughd, linux-mm, houtao1, yi.zhang
On Mon, Jan 28, 2019 at 12:18:05PM -0800, Matthew Wilcox wrote:
> On Mon, Jan 28, 2019 at 08:31:19PM +0800, zhengbin wrote:
> > The 'end_byte' parameter of filemap_range_has_page is required to be
> > inclusive, so follow the rule.
>
> Reviewed-by: Matthew Wilcox <willy@infradead.org>
> Fixes: 6be96d3ad34a ("fs: return if direct I/O will trigger writeback")
>
> Adding the people in the sign-off chain to the Cc.
This looks correct to me:
Acked-by: Christoph Hellwig <hch@lst.de>
I wish we'd kill these stupid range calling conventions, though -
offset + len is a lot more intuitive, and we already use it very
widely all over the kernel.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page
2019-02-01 7:43 ` Christoph Hellwig
@ 2019-02-01 15:14 ` Jens Axboe
2019-02-01 19:32 ` Matthew Wilcox
1 sibling, 0 replies; 6+ messages in thread
From: Jens Axboe @ 2019-02-01 15:14 UTC (permalink / raw)
To: Christoph Hellwig, Matthew Wilcox
Cc: zhengbin, Goldwyn Rodrigues, Jan Kara, akpm, darrick.wong,
amir73il, david, hannes, jrdr.linux, hughd, linux-mm, houtao1,
yi.zhang
On 2/1/19 12:43 AM, Christoph Hellwig wrote:
> On Mon, Jan 28, 2019 at 12:18:05PM -0800, Matthew Wilcox wrote:
>> On Mon, Jan 28, 2019 at 08:31:19PM +0800, zhengbin wrote:
>>> The 'end_byte' parameter of filemap_range_has_page is required to be
>>> inclusive, so follow the rule.
>>
>> Reviewed-by: Matthew Wilcox <willy@infradead.org>
>> Fixes: 6be96d3ad34a ("fs: return if direct I/O will trigger writeback")
>>
>> Adding the people in the sign-off chain to the Cc.
>
> This looks correct to me:
>
> Acked-by: Christoph Hellwig <hch@lst.de>
Ditto
> I wish we'd kill these stupid range calling conventions, though -
> offset + len is a lot more intuitive, and we already use it very
> widely all over the kernel.
Wholeheartedly agree on that, it's a horrible interface that goes
counter to the whole "easy to use, hard to misuse" mantra.
--
Jens Axboe
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page
2019-02-01 7:43 ` Christoph Hellwig
2019-02-01 15:14 ` Jens Axboe
@ 2019-02-01 19:32 ` Matthew Wilcox
1 sibling, 0 replies; 6+ messages in thread
From: Matthew Wilcox @ 2019-02-01 19:32 UTC (permalink / raw)
To: Christoph Hellwig
Cc: zhengbin, Goldwyn Rodrigues, Jan Kara, Jens Axboe, akpm,
darrick.wong, amir73il, david, hannes, jrdr.linux, hughd,
linux-mm, houtao1, yi.zhang
On Fri, Feb 01, 2019 at 08:43:59AM +0100, Christoph Hellwig wrote:
> On Mon, Jan 28, 2019 at 12:18:05PM -0800, Matthew Wilcox wrote:
> > On Mon, Jan 28, 2019 at 08:31:19PM +0800, zhengbin wrote:
> > > The 'end_byte' parameter of filemap_range_has_page is required to be
> > > inclusive, so follow the rule.
> >
> > Reviewed-by: Matthew Wilcox <willy@infradead.org>
> > Fixes: 6be96d3ad34a ("fs: return if direct I/O will trigger writeback")
> >
> > Adding the people in the sign-off chain to the Cc.
>
> This looks correct to me:
>
> Acked-by: Christoph Hellwig <hch@lst.de>
>
> I wish we'd kill these stupid range calling conventions, though -
> offset + len is a lot more intuitive, and we already use it very
> widely all over the kernel.
It has its own problems though; you have to check that offset + len -
1 doesn't wrap past zero. Really, it's the transition from (offset,
len) to (min, max) that needs to be avoided as much as possible within
a subsystem.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2019-02-01 19:32 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2019-01-28 12:31 [PATCH] mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page zhengbin
2019-01-28 12:31 ` zhengbin
2019-01-28 20:18 ` Matthew Wilcox
2019-02-01 7:43 ` Christoph Hellwig
2019-02-01 15:14 ` Jens Axboe
2019-02-01 19:32 ` Matthew Wilcox
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