linux-kernel - RE: [PATCH v3] manpage: update FALLOC_FL_INSERT

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Date:	Fri, 08 May 2015 18:42:23 +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 v3] manpage: update FALLOC_FL_INSERT_RANGE flag in fallocate

> Hi Namjae,
Hi Michael,

> 
> > Update FALLOC_FL_INSERT_RANGE flag in fallocate.
> 
> Sorry -- I should have said that I already applied your V2
> patch and made the fix we discussed (and that you add below).
> I just hadn't pushed to Git yet. Done now.
Okay :)
Thanks very much!!
> 
> Cheers,
> 
> Michael
> 
> On 05/08/2015 07:28 AM, Namjae Jeon wrote:
> > 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
> > +is greater than or equal to the end of file, an error is
> > +returned.
> > +For such type of operations, i.e. inserting a hole at the end of file,
> > +.BR ftruncate(2)
> > +should be used.
> > +In case
> > +.IR offset + len
> > +exceeds the maximum file size, errno will be set to
> > +.B EFBIG.
> > +
> > +No other flags may be specified in
> > +.IR mode
> > +in conjunction with
> > +.BR FALLOC_FL_INSERT_RANGE .
> > +
> > +As of Linux 4.1,
> > +.B FALLOC_FL_INSERT_RANGE
> > +is supported by
> > +XFS.
> > +.\" commit a904b1ca5751faf5ece8600e18cd3b674afcca1b
> >  .SH RETURN VALUE
> >  On success,
> >  .BR fallocate ()
> > @@ -245,6 +298,12 @@ is not a valid file descriptor, or is not opened for writing.
> >  .IR offset + len
> >  exceeds the maximum file size.
> >  .TP
> > +.B EFBIG
> > +.I mode
> > +is
> > +.BR FALLOC_FL_INSERT_RANGE ,
> > +the current file size+len exceeds the maximum file size.
> > +.TP
> >  .B EINTR
> >  A signal was caught during execution.
> >  .TP
> > @@ -273,7 +332,17 @@ reaches or passes the end of the file.
> >  .B EINVAL
> >  .I mode
> >  is
> > -.BR FALLOC_FL_COLLAPSE_RANGE ,
> > +.BR FALLOC_FL_INSERT_RANGE
> > +and the range specified by
> > +.I offset
> > +reaches or passes the end of the file.
> > +.TP
> > +.B EINVAL
> > +.I mode
> > +is
> > +.BR FALLOC_FL_COLLAPSE_RANGE
> > +or
> > +.BR FALLOC_FL_INSERT_RANGE ,
> >  but either
> >  .I offset
> >  or
> > @@ -282,18 +351,24 @@ is not a multiple of the filesystem block size.
> >  .TP
> >  .B EINVAL
> >  .I mode
> > -contains both
> > +contains either of
> >  .B FALLOC_FL_COLLAPSE_RANGE
> > +or
> > +.B FALLOC_FL_INSERT_RANGE
> >  and other flags;
> >  no other flags are permitted with
> > -.BR FALLOC_FL_COLLAPSE_RANGE .
> > +.BR FALLOC_FL_COLLAPSE_RANGE
> > +or
> > +.BR FALLOC_FL_INSERT_RANGE .
> >  .TP
> >  .B EINVAL
> >  .I mode
> >  is
> >  .BR FALLOC_FL_COLLAPSE_RANGE
> >  or
> > -.BR FALLOC_FL_ZERO_RANGE ,
> > +.BR FALLOC_FL_ZERO_RANGE
> > +or
> > +.BR FALLOC_FL_INSERT_RANGE ,
> >  but the file referred to by
> >  .I fd
> >  is not a regular file.
> > @@ -345,6 +420,8 @@ specifies
> >  .BR FALLOC_FL_PUNCH_HOLE
> >  or
> >  .BR FALLOC_FL_COLLAPSE_RANGE
> > +or
> > +.BR FALLOC_FL_INSERT_RANGE
> >  and
> >  the file referred to by
> >  .I fd
> > @@ -363,7 +440,9 @@ refers to a pipe or FIFO.
> >  .B ETXTBSY
> >  .I mode
> >  specifies
> > -.BR FALLOC_FL_COLLAPSE_RANGE ,
> > +.BR FALLOC_FL_COLLAPSE_RANGE
> > +or
> > +.BR FALLOC_FL_INSERT_RANGE ,
> >  but the file referred to by
> >  .IR fd
> >  is currently being executed.
> >
> 
> 
> --
> 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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