libglusterfs/syncop: add more functions

do proper 'ref's and implement 'write()' and 'ftruncate()'

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 3081 (synchronous operations should be enhanced)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=3081

2 files changed, 59 insertions, 7 deletions

diff --git a/libglusterfs/src/syncop.c b/libglusterfs/src/syncop.c
index ce6613845fa..93ce671766b 100644
--- a/libglusterfs/src/syncop.c
+++ b/libglusterfs/src/syncop.c
@@ -298,8 +298,9 @@ syncop_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret == 0) {
                 args->iatt1  = *iatt;
-                args->xattr  = dict_ref (xattr);
                 args->iatt2  = *parent;
+                if (xattr)
+                        args->xattr  = dict_ref (xattr);
         }
 
         __wake (args);
@@ -673,8 +674,9 @@ syncop_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         args->op_errno = op_errno;
 
         if (args->op_ret >= 0) {
-                args->iobref = iobref;
-                args->vector = vector;
+                if (iobref)
+                        args->iobref = iobref_ref (iobref);
+                args->vector = iov_dup (vector, count);
                 args->count  = count;
         }
 
@@ -686,7 +688,7 @@ syncop_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
 int
 syncop_readv (xlator_t *subvol, fd_t *fd, size_t size, off_t off,
-              struct iovec *vector, int *count, struct iobref *iobref)
+              struct iovec **vector, int *count, struct iobref **iobref)
 {
         struct syncargs args = {0, };
 
@@ -694,14 +696,14 @@ syncop_readv (xlator_t *subvol, fd_t *fd, size_t size, off_t off,
                 fd, size, off);
 
         if (vector)
-                vector = iov_dup (args.vector, args.count);
+                *vector = args.vector;
 
         if (count)
                 *count = args.count;
 
         /* Do we need a 'ref' here? */
         if (iobref)
-                iobref = args.iobref;
+                *iobref = args.iobref;
 
         errno = args.op_errno;
         return args.op_ret;
@@ -738,6 +740,22 @@ syncop_writev (xlator_t *subvol, fd_t *fd, struct iovec *vector,
         return args.op_ret;
 }
 
+int syncop_write (xlator_t *subvol, fd_t *fd, const char *buf, int size,
+                  off_t offset, struct iobref *iobref)
+{
+        struct syncargs args = {0,};
+        struct iovec    vec  = {0,};
+
+        vec.iov_len = size;
+        vec.iov_base = (void *)buf;
+
+        SYNCOP (subvol, (&args), syncop_writev_cbk, subvol->fops->writev,
+                fd, &vec, 1, offset, iobref);
+
+        errno = args.op_errno;
+        return args.op_ret;
+}
+
 
 int
 syncop_close (fd_t *fd)
@@ -809,3 +827,32 @@ syncop_unlink (xlator_t *subvol, loc_t *loc)
         errno = args.op_errno;
         return args.op_ret;
 }
+
+int
+syncop_ftruncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                      int op_ret, int op_errno, struct iatt *prebuf,
+                      struct iatt *postbuf)
+{
+        struct syncargs *args = NULL;
+
+        args = cookie;
+
+        args->op_ret   = op_ret;
+        args->op_errno = op_errno;
+
+        __wake (args);
+
+        return 0;
+}
+
+int
+syncop_ftruncate (xlator_t *subvol, fd_t *fd, off_t offset)
+{
+        struct syncargs args = {0, };
+
+        SYNCOP (subvol, (&args), syncop_ftruncate_cbk, subvol->fops->ftruncate,
+                fd, offset);
+
+        errno = args.op_errno;
+        return args.op_ret;
+}
diff --git a/libglusterfs/src/syncop.h b/libglusterfs/src/syncop.h
index 34844899c2d..fb8fd9e11da 100644
--- a/libglusterfs/src/syncop.h
+++ b/libglusterfs/src/syncop.h
@@ -188,11 +188,16 @@ int syncop_create (xlator_t *subvol, loc_t *loc, int32_t flags, mode_t mode,
 int syncop_open (xlator_t *subvol, loc_t *loc, int32_t flags, fd_t *fd);
 int syncop_close (fd_t *fd);
 
+int syncop_write (xlator_t *subvol, fd_t *fd, const char *buf, int size,
+                  off_t offset, struct iobref *iobref);
 int syncop_writev (xlator_t *subvol, fd_t *fd, struct iovec *vector,
                    int32_t count, off_t offset, struct iobref *iobref);
 int syncop_readv (xlator_t *subvol, fd_t *fd, size_t size, off_t off,
                   /* out */
-                  struct iovec *vector, int *count, struct iobref *iobref);
+                  struct iovec **vector, int *count, struct iobref **iobref);
+
+int syncop_ftruncate (xlator_t *subvol, fd_t *fd, off_t offset);
+
 int syncop_unlink (xlator_t *subvol, loc_t *loc);