From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
Partial writes are performed when there is an error midway
while performing the I/O. Perform the write exactly once and
return the number of bytes written.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
io/io.h | 1 +
io/pwrite.c | 25 ++++++++++++++++++++++++-
man/man8/xfs_io.8 | 3 +++
3 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/io/io.h b/io/io.h
index 2bc7ac4a..5875e85a 100644
--- a/io/io.h
+++ b/io/io.h
@@ -24,6 +24,7 @@
#define IO_RANDOM ( 0)
#define IO_FORWARD ( 1)
#define IO_BACKWARD (-1)
+#define IO_PARTIAL (2)
/*
* File descriptor options
diff --git a/io/pwrite.c b/io/pwrite.c
index 8289c3ee..40f537b3 100644
--- a/io/pwrite.c
+++ b/io/pwrite.c
@@ -47,6 +47,7 @@ pwrite_help(void)
" -W -- call fsync(2) at the end (included in timing results)\n"
" -B -- write backwards through the range from offset (backwards N bytes)\n"
" -F -- write forwards through the range of bytes from offset (default)\n"
+" -P -- return Partial writes, perform one call and return bytes written\n"
" -R -- write at random offsets in the specified range of bytes\n"
" -Z N -- zeed the random number generator (used when writing randomly)\n"
" (heh, zorry, the -s/-S arguments were already in use in pwrite)\n"
@@ -255,6 +256,22 @@ write_buffer(
return ops;
}
+static int
+write_partial(
+ off64_t offset,
+ long long count,
+ long long *total,
+ int pwritev2_flags)
+{
+ size_t bytes;
+ bytes = do_pwrite(file->fd, offset, count, count, pwritev2_flags);
+ if (bytes < 0)
+ return -1;
+ *total = bytes;
+ return 1;
+}
+
+
static int
pwrite_f(
int argc,
@@ -276,7 +293,7 @@ pwrite_f(
init_cvtnum(&fsblocksize, &fssectsize);
bsize = fsblocksize;
- while ((c = getopt(argc, argv, "b:BCdf:Fi:NqRs:S:uV:wWZ:")) != EOF) {
+ while ((c = getopt(argc, argv, "b:BCdf:Fi:NqRs:PS:uV:wWZ:")) != EOF) {
switch (c) {
case 'b':
tmp = cvtnum(fsblocksize, fssectsize, optarg);
@@ -298,6 +315,9 @@ pwrite_f(
case 'R':
direction = IO_RANDOM;
break;
+ case 'P':
+ direction = IO_PARTIAL;
+ break;
case 'd':
dflag = 1;
break;
@@ -389,6 +409,9 @@ pwrite_f(
case IO_BACKWARD:
c = write_backward(offset, &count, &total, pwritev2_flags);
break;
+ case IO_PARTIAL:
+ c = write_partial(offset, count, &total, pwritev2_flags);
+ break;
default:
total = 0;
ASSERT(0);
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index f410ce9a..b21a8145 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -229,6 +229,9 @@ write the buffers in a reserve sequential direction.
.B \-R
write the buffers in the give range in a random order.
.TP
+.B \-P
+return Partial writes, perform one call and return the bytes written.
+.TP
.B \-Z seed
specify the random number seed used for random write
.TP
--
2.14.1
--
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
