From: Stephen Bates <sbates@xxxxxxxxxxxx>
It is useful to be able to initialize the buffer contents using an
input file (e.g. when testing certain pathological patterns for
compression). Add support to the buffer_pattern input argument for
reading data from a file via enclosing the filename in ``''``.
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Reviewed-By: Muli Ben-Yehuda <muli@xxxxxxxxxxxxxxxxx>
Signed-off-by: Stephen Bates <sbates@xxxxxxxxxxxx>
---
HOWTO | 19 +++++++++++------
lib/pattern.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 78 insertions(+), 6 deletions(-)
diff --git a/HOWTO b/HOWTO
index ea9466a..7959ad1 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1401,11 +1401,18 @@ Buffers and memory
.. option:: buffer_pattern=str
- If set, fio will fill the I/O buffers with this pattern. If not set, the
- contents of I/O buffers is defined by the other options related to buffer
- contents. The setting can be any pattern of bytes, and can be prefixed with
- 0x for hex values. It may also be a string, where the string must then be
- wrapped with ``""``, e.g.::
+ If set, fio will fill the I/O buffers with this pattern or with the contents
+ of a file. If not set, the contents of I/O buffers are defined by the other
+ options related to buffer contents. The setting can be any pattern of bytes,
+ and can be prefixed with 0x for hex values. It may also be a string, where
+ the string must then be wrapped with ``""``. Or it may also be a filename,
+ where the filename must be wrapped with ``''`` in which case the file is
+ opened and read. Note that not all the file contents will be read if that
+ would cause the buffers to overflow. So, for example::
+
+ buffer_pattern='filename'
+
+ or::
buffer_pattern="abcd"
@@ -1419,7 +1426,7 @@ Buffers and memory
Also you can combine everything together in any order::
- buffer_pattern=0xdeadface"abcd"-12
+ buffer_pattern=0xdeadface"abcd"-12'filename'
.. option:: dedupe_percentage=int
diff --git a/lib/pattern.c b/lib/pattern.c
index 0aeb935..420d74a 100644
--- a/lib/pattern.c
+++ b/lib/pattern.c
@@ -4,6 +4,10 @@
#include <limits.h>
#include <errno.h>
#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
#include "strntol.h"
#include "pattern.h"
@@ -11,6 +15,64 @@
#include "../oslib/strcasestr.h"
/**
+ * parse_file() - parses binary file to fill buffer
+ * @beg - string input, extract filename from this
+ * @out - output buffer where parsed number should be put
+ * @out_len - length of the output buffer
+ * @filled - pointer where number of bytes successfully
+ * parsed will be put
+ *
+ * Returns the end pointer where parsing has been stopped.
+ * In case of parsing error or lack of bytes in output buffer
+ * NULL will be returned.
+ */
+static const char *parse_file(const char *beg, char *out,
+ unsigned int out_len,
+ unsigned int *filled)
+{
+ const char *end;
+ char *file;
+ int fd;
+ ssize_t count;
+
+ if (!out_len)
+ goto err_out;
+
+ assert(*beg == '\'');
+ beg++;
+ end = strchr(beg, '\'');
+ if (!end)
+ goto err_out;
+
+ file = strndup(beg, end - beg);
+ if (file == NULL)
+ goto err_out;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0)
+ goto err_free_out;
+
+ count = read(fd, out, out_len);
+ if (count == -1)
+ goto err_free_close_out;
+
+ *filled = count;
+ close(fd);
+ free(file);
+
+ /* Catch up quote */
+ return end + 1;
+
+err_free_close_out:
+ close(fd);
+err_free_out:
+ free(file);
+err_out:
+ return NULL;
+
+}
+
+/**
* parse_string() - parses string in double quotes, like "abc"
* @beg - string input
* @out - output buffer where parsed number should be put
@@ -271,6 +333,9 @@ int parse_and_fill_pattern(const char *in, unsigned int in_len,
parsed_fmt = 0;
switch (*beg) {
+ case '\'':
+ end = parse_file(beg, out, out_len, &filled);
+ break;
case '"':
end = parse_string(beg, out, out_len, &filled);
break;
--
2.7.4
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