libgfapi : anonymous fd support

Anonymous fd's are floating fd assigned to a glusterfs client
without a explicit file open. Here either it will create a new
anonymous fd or existing anonymous fd in the client stack for
requested file.The anonymous fd's are mainly used for IO's.
This patch introduces two api's glfs_h_anonymous_read and
glfs_h_anonymous_write which performs read and write respectively

Change-Id: Id646f2220e8387b2f8bb244c848dc1db6761444f
BUG: 1204651
Signed-off-by: Jiffin Tony Thottan <jthottan@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/9971
Tested-by: Gluster Build System <jenkins@build.gluster.com>

3 files changed, 128 insertions, 1 deletions

diff --git a/tests/basic/gfapi/Makefile.am b/tests/basic/gfapi/Makefile.am
index 39fc04b0f39..cdb0e543803 100644
--- a/tests/basic/gfapi/Makefile.am
+++ b/tests/basic/gfapi/Makefile.am
@@ -4,7 +4,7 @@
 CFLAGS   = -Wall -g $(shell pkg-config --cflags glusterfs-api)
 LDFLAGS  = $(shell pkg-config --libs glusterfs-api)
 
-BINARIES = upcall-cache-invalidate libgfapi-fini-hang
+BINARIES = upcall-cache-invalidate libgfapi-fini-hang anonymous_fd
 
 %: %.c
 
diff --git a/tests/basic/gfapi/anonymous_fd.sh b/tests/basic/gfapi/anonymous_fd.sh
new file mode 100755
index 00000000000..2184f8efc8e
--- /dev/null
+++ b/tests/basic/gfapi/anonymous_fd.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+
+cleanup;
+
+TEST glusterd
+
+TEST $CLI volume create $V0 $H0:$B0/brick1;
+EXPECT 'Created' volinfo_field $V0 'Status';
+
+TEST $CLI volume start $V0;
+EXPECT 'Started' volinfo_field $V0 'Status';
+
+logdir=`gluster --print-logdir`
+
+TEST build_tester $(dirname $0)/anonymous_fd_read_write.c -lgfapi -o $(dirname $0)/anonymous_fd
+TEST ./$(dirname $0)/anonymous_fd $V0  $logdir/anonymous_fd.log
+
+cleanup_tester $(dirname $0)/anonymous_fd
+
+TEST $CLI volume stop $V0
+TEST $CLI volume delete $V0
+
+cleanup;
diff --git a/tests/basic/gfapi/anonymous_fd_read_write.c b/tests/basic/gfapi/anonymous_fd_read_write.c
new file mode 100644
index 00000000000..281184e8223
--- /dev/null
+++ b/tests/basic/gfapi/anonymous_fd_read_write.c
@@ -0,0 +1,101 @@
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <limits.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <glusterfs/api/glfs.h>
+#include <glusterfs/api/glfs-handles.h>
+
+#define LOG_ERR(func, ret) do { \
+        if (ret != 0) {            \
+                fprintf (stderr, "%s : returned error %d (%s)\n", \
+                         func, ret, strerror (errno)); \
+                goto out; \
+        } else { \
+                fprintf (stderr, "%s : returned %d\n", func, ret); \
+        } \
+        } while (0)
+
+int
+main (int argc, char *argv[])
+{
+        int                     ret            = 0;
+        glfs_t                  *fs            = NULL;
+        struct glfs_object      *root = NULL, *file_obj = NULL;
+        struct stat             sb             = {0, };
+        char                    readbuf[32], writebuf[32];
+        char                    *filename      = "file.txt";
+        char                    *logfile       = NULL;
+        char                    *volname       = NULL;
+
+        if (argc != 3) {
+                fprintf (stderr, "Invalid argument\n");
+                exit(1);
+        }
+
+        volname = argv[1];
+        logfile = argv[2];
+
+        fs = glfs_new (volname);
+        if (!fs) {
+                fprintf (stderr, "glfs_new: returned NULL\n");
+                ret = -1;
+        }
+
+        ret = glfs_set_volfile_server (fs, "tcp", "localhost", 24007);
+        LOG_ERR("glfs_set_volfile_server", ret);
+
+        ret = glfs_set_logging (fs, logfile, 7);
+        LOG_ERR("glfs_set_logging", ret);
+
+        ret = glfs_init (fs);
+        LOG_ERR("glfs_init", ret);
+
+        root = glfs_h_lookupat (fs, NULL, "/", &sb);
+        if (root == NULL) {
+                fprintf (stderr, "glfs_h_lookupat: error on lookup of / ,%s\n",
+                         strerror (errno));
+                goto out;
+        }
+
+        file_obj = glfs_h_creat (fs, root, filename, O_CREAT, 0644, &sb);
+        if (file_obj == NULL) {
+                fprintf (stderr, "glfs_h_creat: error on create of %s: from (%p),%s\n",
+                         filename, root, strerror (errno));
+                goto out;
+        }
+
+        /* test read/write based on anonymous fd */
+        memcpy (writebuf, "abcdefghijklmnopqrstuvwxyz012345", 32);
+
+        ret = glfs_h_anonymous_write (fs, file_obj, writebuf, 32, 0);
+        if (ret < 0)
+                LOG_ERR ("glfs_h_anonymous_write", ret);
+
+        ret = glfs_h_anonymous_read (fs, file_obj, readbuf, 32, 0);
+        if (ret < 0)
+                LOG_ERR ("glfs_h_anonymous_read", ret);
+
+        if (memcmp (readbuf, writebuf, 32)) {
+                fprintf (stderr, "Failed to read what I wrote: %s %s\n", readbuf,
+                         writebuf);
+                ret = -1;
+                goto out;
+        }
+
+        ret = 0;
+out:
+        if (file_obj)
+                glfs_h_close (file_obj);
+
+        if (fs) {
+                ret = glfs_fini(fs);
+                fprintf (stderr, "glfs_fini(fs) returned %d \n", ret);
+        }
+        if (ret)
+                exit(1);
+        exit(0);
+}