linux-kernel - RE: [PATCH v2] manpage: update FALLOC_FL_INSERT

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Date:	Thu, 07 May 2015 17:29:10 +0900
From:	Namjae Jeon <namjae.jeon@...sung.com>
To:	"'Michael Kerrisk (man-pages)'" <mtk.manpages@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-man@...r.kernel.org, 'Linux API' <linux-api@...r.kernel.org>,
	'Dave Chinner' <david@...morbit.com>,
	'Theodore Ts'o' <tytso@....edu>
Subject: RE: [PATCH v2] manpage: update FALLOC_FL_INSERT_RANGE flag in fallocate

> Hello Namjae Jeon,
Hi Michael,
> 
> Thanks for the revised patch. I have a question below:
> 
> On 05/07/2015 07:15 AM, Namjae Jeon wrote:
> > Update FALLOC_FL_INSERT_RANGE flag in fallocate.
> >
> > Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> > Signed-off-by: Ashish Sangwan <a.sangwan@...sung.com>
> > ---
> >  man2/fallocate.2 | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
> >  1 file changed, 84 insertions(+), 5 deletions(-)
> >
> > diff --git a/man2/fallocate.2 b/man2/fallocate.2
> > index 0cc1a00..0d31027 100644
> > --- a/man2/fallocate.2
> > +++ b/man2/fallocate.2
> > @@ -228,6 +228,59 @@ ext4, for extent-based files (since Linux 3.15)
> >  .IP *
> >  SMB3 (since Linux 3.17)
> >  .\" commit 30175628bf7f521e9ee31ac98fa6d6fe7441a556
> > +.SS Increasing file space
> > +flag (available since Linux 4.1)
> > +.\" commit dd46c787788d5bf5b974729d43e4c405814a4c7d
> > +Specifying the
> > +.BR FALLOC_FL_INSERT_RANGE
> > +flag in
> > +.I mode
> > +will increase the file space by inserting a hole within the file size without
> > +overwriting any existing data.
> > +The hole will start at
> > +.I offset
> > +and continue for
> > +.I len
> > +bytes.
> > +For inserting hole inside file, the contents of the file starting at
> > +.I offset
> > +will be shifted towards right by
> > +.I len
> > +bytes.
> > +Inserting a hole inside the file will increase the file size by
> > +.I len
> > +bytes.
> > +
> > +This mode has the same limitation as
> > +.BR FALLOC_FL_COLLAPSE_RANGE
> > +regarding the
> > +granularity of the operation.
> > +If the granularity requirements are not met,
> > +.BR fallocate ()
> > +will fail with the error
> > +.BR EINVAL.
> > +If the
> > +.I offset
> > +overlaps with end of file OR if it is greater than end of file, an error is
> 
> 
> Could that last line not be simplified to
> 
>    if the offset is greater than or equal to the end of file
> 
> ?
Yes, Looks good :)

Thanks!!
> 
> Thanks,
> 
> Michael
> 
> 
> --
> Michael Kerrisk
> Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
> Linux/UNIX System Programming Training: http://man7.org/training/

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