> 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@xxxxxxxxxxx> > > Signed-off-by: Ashish Sangwan <a.sangwan@xxxxxxxxxxx> > > --- > > 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/ -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
