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>
---
io/pwrite.c | 8 +++++++-
man/man8/xfs_io.8 | 6 ++++++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/io/pwrite.c b/io/pwrite.c
index 82eaf827..8289c3ee 100644
--- a/io/pwrite.c
+++ b/io/pwrite.c
@@ -52,6 +52,9 @@ pwrite_help(void)
" (heh, zorry, the -s/-S arguments were already in use in pwrite)\n"
#ifdef HAVE_PWRITEV
" -V N -- use vectored IO with N iovecs of blocksize each (pwritev)\n"
+#ifdef HAVE_PWRITEV2
+" -N -- Perform the pwritev2() with RWF_NOWAIT\n"
+#endif
#endif
"\n"));
}
@@ -273,7 +276,7 @@ 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);
@@ -302,6 +305,9 @@ pwrite_f(
case 'i':
infile = optarg;
break;
+ case 'N':
+ pwritev2_flags |= RWF_NOWAIT;
+ break;
case 's':
skip = cvtnum(fsblocksize, fssectsize, optarg);
if (skip < 0) {
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 2c56f092..f410ce9a 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -248,6 +248,12 @@ 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.
.RE
.PD
.TP
--
2.14.1
--
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