core: add an extra flag to readv()/writev() API

needed to implement a proper handling of open flag alterations
using fcntl() on fd.

Change-Id: Ic280d5db6f1dc0418d5c439abb8db1d3ac21ced0
Signed-off-by: Amar Tumballi <amar@gluster.com>
BUG: 782265
Reviewed-on: http://review.gluster.com/2723
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

7 files changed, 53 insertions, 37 deletions

diff --git a/libglusterfs/src/call-stub.c b/libglusterfs/src/call-stub.c
index 24ca3825b..cdae9df25 100644
--- a/libglusterfs/src/call-stub.c
+++ b/libglusterfs/src/call-stub.c
@@ -888,7 +888,7 @@ fop_readv_stub (call_frame_t *frame,
                 fop_readv_t fn,
                 fd_t *fd,
                 size_t size,
-                off_t off)
+                off_t off, uint32_t flags)
 {
         call_stub_t *stub = NULL;
 
@@ -900,8 +900,10 @@ fop_readv_stub (call_frame_t *frame,
         stub->args.readv.fn = fn;
         if (fd)
                 stub->args.readv.fd = fd_ref (fd);
-        stub->args.readv.size = size;
-        stub->args.readv.off = off;
+        stub->args.readv.size  = size;
+        stub->args.readv.off   = off;
+        stub->args.readv.flags = flags;
+
 out:
         return stub;
 }
@@ -945,7 +947,7 @@ fop_writev_stub (call_frame_t *frame,
                  fd_t *fd,
                  struct iovec *vector,
                  int32_t count,
-                 off_t off,
+                 off_t off, uint32_t flags,
                  struct iobref *iobref)
 {
         call_stub_t *stub = NULL;
@@ -960,9 +962,11 @@ fop_writev_stub (call_frame_t *frame,
         if (fd)
                 stub->args.writev.fd = fd_ref (fd);
         stub->args.writev.vector = iov_dup (vector, count);
-        stub->args.writev.count = count;
-        stub->args.writev.off = off;
+        stub->args.writev.count  = count;
+        stub->args.writev.off    = off;
+        stub->args.writev.flags  = flags;
         stub->args.writev.iobref = iobref_ref (iobref);
+
 out:
         return stub;
 }
@@ -2258,7 +2262,8 @@ call_resume_wind (call_stub_t *stub)
                                      stub->frame->this,
                                      stub->args.readv.fd,
                                      stub->args.readv.size,
-                                     stub->args.readv.off);
+                                     stub->args.readv.off,
+                                     stub->args.readv.flags);
                 break;
         }
 
@@ -2270,6 +2275,7 @@ call_resume_wind (call_stub_t *stub)
                                       stub->args.writev.vector,
                                       stub->args.writev.count,
                                       stub->args.writev.off,
+                                      stub->args.writev.flags,
                                       stub->args.writev.iobref);
                 break;
         }
diff --git a/libglusterfs/src/call-stub.h b/libglusterfs/src/call-stub.h
index 5e6c0a1d3..081f6d200 100644
--- a/libglusterfs/src/call-stub.h
+++ b/libglusterfs/src/call-stub.h
@@ -268,6 +268,7 @@ typedef struct {
 			fd_t *fd;
 			size_t size;
 			off_t off;
+                        uint32_t flags;
 		} readv;
 		struct {
 			fop_readv_cbk_t fn;
@@ -286,6 +287,7 @@ typedef struct {
 			struct iovec *vector;
 			int32_t count;
 			off_t off;
+                        uint32_t flags;
 			struct iobref *iobref;
 		} writev;
 		struct {
@@ -823,7 +825,7 @@ fop_readv_stub (call_frame_t *frame,
 		fop_readv_t fn,
 		fd_t *fd,
 		size_t size,
-		off_t off);
+		off_t off, uint32_t flags);
 
 call_stub_t *
 fop_readv_cbk_stub (call_frame_t *frame,
@@ -841,7 +843,7 @@ fop_writev_stub (call_frame_t *frame,
 		 fd_t *fd,
 		 struct iovec *vector,
 		 int32_t count,
-		 off_t off,
+		 off_t off, uint32_t flags,
                  struct iobref *iobref);
 
 call_stub_t *
diff --git a/libglusterfs/src/defaults.c b/libglusterfs/src/defaults.c
index be2c9c55f..f3a8d2832 100644
--- a/libglusterfs/src/defaults.c
+++ b/libglusterfs/src/defaults.c
@@ -517,20 +517,20 @@ default_flush_resume (call_frame_t *frame, xlator_t *this, fd_t *fd)
 int32_t
 default_writev_resume (call_frame_t *frame, xlator_t *this, fd_t *fd,
                        struct iovec *vector, int32_t count, off_t off,
-                       struct iobref *iobref)
+                       uint32_t flags, struct iobref *iobref)
 {
         STACK_WIND (frame, default_writev_cbk, FIRST_CHILD(this),
                     FIRST_CHILD(this)->fops->writev, fd, vector, count, off,
-                    iobref);
+                    flags, iobref);
         return 0;
 }
 
 int32_t
 default_readv_resume (call_frame_t *frame, xlator_t *this, fd_t *fd,
-                      size_t size, off_t offset)
+                      size_t size, off_t offset, uint32_t flags)
 {
         STACK_WIND (frame, default_readv_cbk, FIRST_CHILD(this),
-                    FIRST_CHILD(this)->fops->readv, fd, size, offset);
+                    FIRST_CHILD(this)->fops->readv, fd, size, offset, flags);
         return 0;
 }
 
@@ -898,21 +898,21 @@ default_flush (call_frame_t *frame, xlator_t *this, fd_t *fd)
 
 int32_t
 default_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
-                struct iovec *vector, int32_t count, off_t off,
+                struct iovec *vector, int32_t count, off_t off, uint32_t flags,
                 struct iobref *iobref)
 {
         STACK_WIND (frame, default_writev_cbk, FIRST_CHILD(this),
                     FIRST_CHILD(this)->fops->writev, fd, vector, count, off,
-                    iobref);
+                    flags, iobref);
         return 0;
 }
 
 int32_t
 default_readv (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
-               off_t offset)
+               off_t offset, uint32_t flags)
 {
         STACK_WIND (frame, default_readv_cbk, FIRST_CHILD(this),
-                    FIRST_CHILD(this)->fops->readv, fd, size, offset);
+                    FIRST_CHILD(this)->fops->readv, fd, size, offset, flags);
         return 0;
 }
 
diff --git a/libglusterfs/src/defaults.h b/libglusterfs/src/defaults.h
index deba1557d..f30bd8332 100644
--- a/libglusterfs/src/defaults.h
+++ b/libglusterfs/src/defaults.h
@@ -117,7 +117,8 @@ int32_t default_readv (call_frame_t *frame,
                        xlator_t *this,
                        fd_t *fd,
                        size_t size,
-                       off_t offset);
+                       off_t offset,
+                       uint32_t flags);
 
 int32_t default_writev (call_frame_t *frame,
                         xlator_t *this,
@@ -125,6 +126,7 @@ int32_t default_writev (call_frame_t *frame,
                         struct iovec *vector,
                         int32_t count,
                         off_t offset,
+                        uint32_t flags,
                         struct iobref *iobref);
 
 int32_t default_flush (call_frame_t *frame,
@@ -333,18 +335,18 @@ int32_t default_open_resume (call_frame_t *frame,
                       int32_t wbflags);
 
 int32_t default_readv_resume (call_frame_t *frame,
-                       xlator_t *this,
-                       fd_t *fd,
-                       size_t size,
-                       off_t offset);
+                              xlator_t *this,
+                              fd_t *fd,
+                              size_t size,
+                              off_t offset, uint32_t flags);
 
 int32_t default_writev_resume (call_frame_t *frame,
-                        xlator_t *this,
-                        fd_t *fd,
-                        struct iovec *vector,
-                        int32_t count,
-                        off_t offset,
-                        struct iobref *iobref);
+                               xlator_t *this,
+                               fd_t *fd,
+                               struct iovec *vector,
+                               int32_t count,
+                               off_t offset, uint32_t flags,
+                               struct iobref *iobref);
 
 int32_t default_flush_resume (call_frame_t *frame,
                        xlator_t *this,
diff --git a/libglusterfs/src/syncop.c b/libglusterfs/src/syncop.c
index 86b4822c5..7b6f78248 100644
--- a/libglusterfs/src/syncop.c
+++ b/libglusterfs/src/syncop.c
@@ -791,12 +791,13 @@ 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)
+              uint32_t flags, struct iovec **vector, int *count,
+              struct iobref **iobref)
 {
         struct syncargs args = {0, };
 
         SYNCOP (subvol, (&args), syncop_readv_cbk, subvol->fops->readv,
-                fd, size, off);
+                fd, size, off, flags);
 
         if (vector)
                 *vector = args.vector;
@@ -836,19 +837,20 @@ syncop_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
 int
 syncop_writev (xlator_t *subvol, fd_t *fd, struct iovec *vector,
-               int32_t count, off_t offset, struct iobref *iobref)
+               int32_t count, off_t offset, struct iobref *iobref,
+               uint32_t flags)
 {
         struct syncargs args = {0, };
 
         SYNCOP (subvol, (&args), syncop_writev_cbk, subvol->fops->writev,
-                fd, vector, count, offset, iobref);
+                fd, vector, count, offset, flags, iobref);
 
         errno = args.op_errno;
         return args.op_ret;
 }
 
 int syncop_write (xlator_t *subvol, fd_t *fd, const char *buf, int size,
-                  off_t offset, struct iobref *iobref)
+                  off_t offset, struct iobref *iobref, uint32_t flags)
 {
         struct syncargs args = {0,};
         struct iovec    vec  = {0,};
@@ -857,7 +859,7 @@ int syncop_write (xlator_t *subvol, fd_t *fd, const char *buf, int size,
         vec.iov_base = (void *)buf;
 
         SYNCOP (subvol, (&args), syncop_writev_cbk, subvol->fops->writev,
-                fd, &vec, 1, offset, iobref);
+                fd, &vec, 1, offset, flags, iobref);
 
         errno = args.op_errno;
         return args.op_ret;
diff --git a/libglusterfs/src/syncop.h b/libglusterfs/src/syncop.h
index 7f696f177..627fb6197 100644
--- a/libglusterfs/src/syncop.h
+++ b/libglusterfs/src/syncop.h
@@ -195,10 +195,12 @@ 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);
+                  off_t offset, struct iobref *iobref, uint32_t flags);
 int syncop_writev (xlator_t *subvol, fd_t *fd, struct iovec *vector,
-                   int32_t count, off_t offset, struct iobref *iobref);
+                   int32_t count, off_t offset, struct iobref *iobref,
+                   uint32_t flags);
 int syncop_readv (xlator_t *subvol, fd_t *fd, size_t size, off_t off,
+                  uint32_t flags,
                   /* out */
                   struct iovec **vector, int *count, struct iobref **iobref);
 
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index cca2505ab..c8eff3353 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -510,7 +510,8 @@ typedef int32_t (*fop_readv_t) (call_frame_t *frame,
                                 xlator_t *this,
                                 fd_t *fd,
                                 size_t size,
-                                off_t offset);
+                                off_t offset,
+                                uint32_t flags);
 
 typedef int32_t (*fop_writev_t) (call_frame_t *frame,
                                  xlator_t *this,
@@ -518,6 +519,7 @@ typedef int32_t (*fop_writev_t) (call_frame_t *frame,
                                  struct iovec *vector,
                                  int32_t count,
                                  off_t offset,
+                                 uint32_t flags,
                                  struct iobref *iobref);
 
 typedef int32_t (*fop_flush_t) (call_frame_t *frame,