From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
This allows to make pwritev2() calls with RWF_NOWAIT,
which would fail in case the call blocks.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
---
io/pwrite.c | 12 ++++++++++--
man/man8/xfs_io.8 | 10 ++++++++++
2 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/io/pwrite.c b/io/pwrite.c
index 2cdf0954..c218f686 100644
--- a/io/pwrite.c
+++ b/io/pwrite.c
@@ -53,6 +53,9 @@ pwrite_help(void)
#ifdef HAVE_PWRITEV
" -V N -- use vectored IO with N iovecs of blocksize each (pwritev)\n"
#endif
+#ifdef HAVE_PWRITEV2
+" -N -- Perform the pwritev2() with RWF_NOWAIT\n"
+#endif
"\n"));
}
@@ -279,7 +282,7 @@ pwrite_f(
init_cvtnum(&fsblocksize, &fssectsize);
bsize = fsblocksize;
- while ((c = getopt(argc, argv, "b:BCdf:Fi:qRs:S:uV:wWZ:")) != EOF) {
+ while ((c = getopt(argc, argv, "b:BCdf:Fi:NqRs:S:uV:wWZ:")) != EOF) {
switch (c) {
case 'b':
tmp = cvtnum(fsblocksize, fssectsize, optarg);
@@ -308,6 +311,11 @@ pwrite_f(
case 'i':
infile = optarg;
break;
+#ifdef HAVE_PWRITEV2
+ case 'N':
+ pwritev2_flags |= RWF_NOWAIT;
+ break;
+#endif
case 's':
skip = cvtnum(fsblocksize, fssectsize, optarg);
if (skip < 0) {
@@ -426,7 +434,7 @@ pwrite_init(void)
pwrite_cmd.argmax = -1;
pwrite_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
pwrite_cmd.args =
-_("[-i infile [-d] [-s skip]] [-b bs] [-S seed] [-wW] [-FBR [-Z N]] [-V N] off len");
+_("[-i infile [-d] [-s skip]] [-b bs] [-S seed] [-wW] [-FBR [-Z N]] [-N] [-V N] off len");
pwrite_cmd.oneline =
_("writes a number of bytes at a specified offset");
pwrite_cmd.help = pwrite_help;
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 0fd9b951..5c0565ec 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -282,6 +282,16 @@ Use the vectored IO write syscall
with a number of blocksize length iovecs. The number of iovecs is set by the
.I vectors
parameter.
+.TP
+.B \-N
+Perform the
+.BR pwritev2 (2)
+call with
+.I RWF_NOWAIT.
+This option is available if
+.BR xfs_io
+was built on a kernel which supports
+.I pwritev2 (2)
.RE
.PD
.TP
--
2.14.2
--
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