On Thu, Dec 15, 2016 at 12:38:34PM -0600, Eric Sandeen wrote: > On 12/15/16 12:11 PM, Darrick J. Wong wrote: > > The reflink command can reflink the entirety of two files if the > > offsets and lengths are not specified... but we forgot to permit > > that case. > > Could you do me a favor and also make that clear in the help output? > The manpage says: > > reflink [ -C ] [ -q ] src_file [src_offset dst_offset length] > > > but the short help doesn't indicate that it's optional: > > reflink infile src_off dst_off len -- reflinks a number of bytes at a specified offset Hah, ok, yes, that's unclear and I'll fix it in a 4/3 patch. --D > > and neither it nor the long help mentions the -C & -q switches: > > xfs_io> help reflink > reflink infile src_off dst_off len -- reflinks a number of bytes at a specified offset > > Links a range of bytes (in block size increments) from a file into a range > of bytes in the open file. The two extent ranges need not contain identical > data. > > Example: > 'reflink some_file 0 4096 32768' - links 32768 bytes from some_file at > offset 0 to into the open file at > position 4096 > 'reflink some_file' - links all bytes from some_file into the open file > at position 0 > > Reflink a range of blocks from a given input file to the open file. Both > files share the same range of physical disk blocks; a write to the shared > range of either file should result in the write landing in a new block and > that range of the file being remapped (i.e. copy-on-write). Both files > must reside on the same filesystem. > > V2 or patch 4/3 is fine :) > > Thanks, > -Eric > > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > --- > > io/reflink.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/io/reflink.c b/io/reflink.c > > index a09e82d..d26cbdd 100644 > > --- a/io/reflink.c > > +++ b/io/reflink.c > > @@ -302,7 +302,7 @@ reflink_init(void) > > reflink_cmd.name = "reflink"; > > reflink_cmd.altname = "rl"; > > reflink_cmd.cfunc = reflink_f; > > - reflink_cmd.argmin = 4; > > + reflink_cmd.argmin = 1; > > reflink_cmd.argmax = -1; > > reflink_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK; > > reflink_cmd.args = > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
