core: Separate readdirp and readdir fops

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 292 (Separate readdirp functionality from readdir fop)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=292

9 files changed, 199 insertions, 1 deletions

diff --git a/libglusterfs/src/call-stub.c b/libglusterfs/src/call-stub.c
index bc7d556c22f..a56ed95f02d 100644
--- a/libglusterfs/src/call-stub.c
+++ b/libglusterfs/src/call-stub.c
@@ -2052,6 +2052,48 @@ out:
 }
 
 call_stub_t *
+fop_readdirp_cbk_stub (call_frame_t *frame,
+		       fop_readdirp_cbk_t fn,
+		       int32_t op_ret,
+		       int32_t op_errno,
+		       gf_dirent_t *entries)
+{
+	call_stub_t *stub = NULL;
+	gf_dirent_t *stub_entry = NULL, *entry = NULL;
+
+	GF_VALIDATE_OR_GOTO ("call-stub", frame, out);
+
+	stub = stub_new (frame, 0, GF_FOP_READDIRP);
+	GF_VALIDATE_OR_GOTO ("call-stub", stub, out);
+
+	stub->args.readdirp_cbk.fn = fn;
+	stub->args.readdirp_cbk.op_ret = op_ret;
+	stub->args.readdirp_cbk.op_errno = op_errno;
+	INIT_LIST_HEAD (&stub->args.readdirp_cbk.entries.list);
+
+        /* This check must come after the init of head above
+         * so we're sure the list is empty for list_empty.
+         */
+        if (!entries)
+                goto out;
+
+	if (op_ret > 0) {
+		list_for_each_entry (entry, &entries->list, list) {
+			stub_entry = gf_dirent_for_name (entry->d_name);
+			ERR_ABORT (stub_entry);
+			stub_entry->d_off = entry->d_off;
+			stub_entry->d_ino = entry->d_ino;
+
+			list_add_tail (&stub_entry->list,
+				       &stub->args.readdirp_cbk.entries.list);
+		}
+	}
+out:
+	return stub;
+}
+
+
+call_stub_t *
 fop_readdir_cbk_stub (call_frame_t *frame,
 		      fop_readdir_cbk_t fn,
 		      int32_t op_ret,
@@ -2109,6 +2151,25 @@ fop_readdir_stub (call_frame_t *frame,
 
   return stub;
 }
+
+call_stub_t *
+fop_readdirp_stub (call_frame_t *frame,
+		   fop_readdirp_t fn,
+		   fd_t *fd,
+		   size_t size,
+		   off_t off)
+{
+  call_stub_t *stub = NULL;
+
+  stub = stub_new (frame, 1, GF_FOP_READDIRP);
+  stub->args.readdirp.fn = fn;
+  stub->args.readdirp.fd = fd_ref (fd);
+  stub->args.readdirp.size = size;
+  stub->args.readdirp.off = off;
+
+  return stub;
+}
+
 call_stub_t *
 fop_checksum_stub (call_frame_t *frame,
 		   fop_checksum_t fn,
@@ -2936,6 +2997,17 @@ call_resume_wind (call_stub_t *stub)
 				       stub->args.readdir.off);
 		break;
 	}
+
+        case GF_FOP_READDIRP:
+	{
+		stub->args.readdirp.fn (stub->frame,
+				        stub->frame->this,
+				        stub->args.readdirp.fd,
+				        stub->args.readdirp.size,
+				        stub->args.readdirp.off);
+		break;
+	}
+
 	case GF_FOP_XATTROP:
 	{
 		stub->args.xattrop.fn (stub->frame,
@@ -3834,6 +3906,27 @@ call_resume_unwind (call_stub_t *stub)
 		break;
 	}
 
+        case GF_FOP_READDIRP:
+	{
+		if (!stub->args.readdirp_cbk.fn)
+			STACK_UNWIND (stub->frame,
+				      stub->args.readdirp_cbk.op_ret,
+				      stub->args.readdirp_cbk.op_errno,
+				      &stub->args.readdirp_cbk.entries);
+		else
+			stub->args.readdirp_cbk.fn (stub->frame,
+						    stub->frame->cookie,
+						    stub->frame->this,
+						    stub->args.readdirp_cbk.op_ret,
+						    stub->args.readdirp_cbk.op_errno,
+						    &stub->args.readdirp_cbk.entries);
+
+		if (stub->args.readdirp_cbk.op_ret > 0)
+			gf_dirent_free (&stub->args.readdirp_cbk.entries);
+
+		break;
+	}
+
 	case GF_FOP_XATTROP:
 	{
 		if (!stub->args.xattrop_cbk.fn)
@@ -4268,6 +4361,14 @@ call_stub_destroy_wind (call_stub_t *stub)
 			fd_unref (stub->args.readdir.fd);
 		break;
 	}
+
+        case GF_FOP_READDIRP:
+	{
+		if (stub->args.readdirp.fd)
+			fd_unref (stub->args.readdirp.fd);
+		break;
+	}
+
 	case GF_FOP_XATTROP:
 	{
 		loc_wipe (&stub->args.xattrop.loc);
@@ -4538,6 +4639,14 @@ call_stub_destroy_unwind (call_stub_t *stub)
 	}
 	break;
 
+        case GF_FOP_READDIRP:
+	{
+		if (stub->args.readdirp_cbk.op_ret > 0) {
+			gf_dirent_free (&stub->args.readdirp_cbk.entries);
+		}
+	}
+	break;
+
 	case GF_FOP_XATTROP:
 	{
 		if (stub->args.xattrop_cbk.xattr)
diff --git a/libglusterfs/src/call-stub.h b/libglusterfs/src/call-stub.h
index 88e26c24f72..ae414026fe4 100644
--- a/libglusterfs/src/call-stub.h
+++ b/libglusterfs/src/call-stub.h
@@ -581,6 +581,19 @@ typedef struct {
 			gf_dirent_t entries;
 		} readdir_cbk;
 
+                /* readdirp */
+		struct {
+			fop_readdirp_t fn;
+			fd_t *fd;
+			size_t size;
+			off_t off;
+		} readdirp;
+		struct {
+			fop_readdirp_cbk_t fn;
+			int32_t op_ret, op_errno;
+			gf_dirent_t entries;
+		} readdirp_cbk;
+
 		/* checksum */
 		struct {
 			fop_checksum_t fn;
@@ -1230,6 +1243,20 @@ fop_readdir_stub (call_frame_t *frame,
 		  off_t off);
 
 call_stub_t *
+fop_readdirp_stub (call_frame_t *frame,
+		   fop_readdir_t fn,
+		   fd_t *fd,
+		   size_t size,
+		   off_t off);
+
+call_stub_t *
+fop_readdirp_cbk_stub (call_frame_t *frame,
+		       fop_readdir_cbk_t fn,
+		       int32_t op_ret,
+		       int32_t op_errno,
+		       gf_dirent_t *entries);
+
+call_stub_t *
 fop_readdir_cbk_stub (call_frame_t *frame,
 		      fop_readdir_cbk_t fn,
 		      int32_t op_ret,
diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 49ea724b2e2..59ac5386e4a 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -219,6 +219,7 @@ gf_global_variable_init()
         gf_fop_list[GF_FOP_RCHECKSUM]   = "RCHECKSUM";
         gf_fop_list[GF_FOP_SETATTR]     = "SETATTR";
         gf_fop_list[GF_FOP_FSETATTR]    = "FSETATTR";
+	gf_fop_list[GF_FOP_READDIRP]    = "READDIRP";
 
 	gf_mop_list[GF_MOP_SETVOLUME]   = "SETVOLUME"; /* 0 */
 	gf_mop_list[GF_MOP_GETVOLUME]   = "GETVOLUME"; /* 1 */
diff --git a/libglusterfs/src/defaults.c b/libglusterfs/src/defaults.c
index a2163010331..89c010cd39e 100644
--- a/libglusterfs/src/defaults.c
+++ b/libglusterfs/src/defaults.c
@@ -1493,6 +1493,18 @@ default_readdir_cbk (call_frame_t *frame,
 
 
 int32_t
+default_readdirp_cbk (call_frame_t *frame,
+		      void *cookie,
+		      xlator_t *this,
+		      int32_t op_ret,
+		      int32_t op_errno,
+		      gf_dirent_t *entries)
+{
+	STACK_UNWIND (frame, op_ret, op_errno, entries);
+	return 0;
+}
+
+int32_t
 default_readdir (call_frame_t *frame,
 		 xlator_t *this,
 		 fd_t *fd,
@@ -1509,6 +1521,21 @@ default_readdir (call_frame_t *frame,
 
 
 int32_t
+default_readdirp (call_frame_t *frame,
+		  xlator_t *this,
+		  fd_t *fd,
+		  size_t size,
+		  off_t off)
+{
+	STACK_WIND (frame,
+		    default_readdirp_cbk,
+		    FIRST_CHILD(this),
+		    FIRST_CHILD(this)->fops->readdir,
+		    fd, size, off);
+	return 0;
+}
+
+int32_t
 default_lock_notify_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 			 int32_t op_ret, int32_t op_errno)
 {
diff --git a/libglusterfs/src/defaults.h b/libglusterfs/src/defaults.h
index 2c167d97ed4..6ef9cf571dd 100644
--- a/libglusterfs/src/defaults.h
+++ b/libglusterfs/src/defaults.h
@@ -260,7 +260,12 @@ int32_t default_readdir (call_frame_t *frame,
 			  xlator_t *this,
 			  fd_t *fd,
 			  size_t size, off_t off);
-		 
+
+int32_t default_readdirp (call_frame_t *frame,
+			  xlator_t *this,
+			  fd_t *fd,
+			  size_t size, off_t off);
+
 int32_t default_setdents (call_frame_t *frame,
 			  xlator_t *this,
 			  fd_t *fd,
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index d1d30a492f1..bea33f81ac7 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -126,6 +126,7 @@ typedef enum {
         GF_FOP_RCHECKSUM,
         GF_FOP_SETATTR,
         GF_FOP_FSETATTR,
+        GF_FOP_READDIRP,
         GF_FOP_MAXVALUE,
 } glusterfs_fop_t;
 
diff --git a/libglusterfs/src/protocol.h b/libglusterfs/src/protocol.h
index 59ebaf2bc08..f163d0ed4de 100644
--- a/libglusterfs/src/protocol.h
+++ b/libglusterfs/src/protocol.h
@@ -639,6 +639,18 @@ typedef struct {
 } __attribute__((packed)) gf_fop_readdir_rsp_t;
 
 
+typedef struct {
+	uint64_t ino;
+	int64_t  fd;
+	uint64_t offset;
+	uint32_t size;
+} __attribute__((packed)) gf_fop_readdirp_req_t;
+typedef struct {
+	uint32_t size;
+	char     buf[0];
+} __attribute__((packed)) gf_fop_readdirp_rsp_t;
+
+
 typedef struct  {
 	uint64_t ino;
 	uint32_t mask;
diff --git a/libglusterfs/src/xlator.c b/libglusterfs/src/xlator.c
index 90c9d5cdcb6..879ddd76d70 100644
--- a/libglusterfs/src/xlator.c
+++ b/libglusterfs/src/xlator.c
@@ -82,6 +82,7 @@ fill_defaults (xlator_t *xl)
 	SET_DEFAULT_FOP (removexattr);
 	SET_DEFAULT_FOP (opendir);
 	SET_DEFAULT_FOP (readdir);
+	SET_DEFAULT_FOP (readdirp);
 	SET_DEFAULT_FOP (fsyncdir);
 	SET_DEFAULT_FOP (access);
 	SET_DEFAULT_FOP (ftruncate);
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index a00d4975d92..f71d5dea9bd 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -475,6 +475,13 @@ typedef int32_t (*fop_readdir_cbk_t) (call_frame_t *frame,
 				      int32_t op_errno,
 				      gf_dirent_t *entries);
 
+typedef int32_t (*fop_readdirp_cbk_t) (call_frame_t *frame,
+				       void *cookie,
+				       xlator_t *this,
+				       int32_t op_ret,
+				       int32_t op_errno,
+				       gf_dirent_t *entries);
+
 typedef int32_t (*fop_xattrop_cbk_t) (call_frame_t *frame,
 				      void *cookie,
 				      xlator_t *this,
@@ -750,6 +757,12 @@ typedef int32_t (*fop_readdir_t) (call_frame_t *frame,
 				  size_t size,
 				  off_t offset);
 
+typedef int32_t (*fop_readdirp_t) (call_frame_t *frame,
+			           xlator_t *this,
+				   fd_t *fd,
+				   size_t size,
+				   off_t offset);
+
 typedef int32_t (*fop_xattrop_t) (call_frame_t *frame,
 				  xlator_t *this,
 				  loc_t *loc,
@@ -811,6 +824,7 @@ struct xlator_fops {
 	fop_fsync_t          fsync;
 	fop_opendir_t        opendir;
 	fop_readdir_t        readdir;
+	fop_readdirp_t       readdirp;
 	fop_fsyncdir_t       fsyncdir;
 	fop_statfs_t         statfs;
 	fop_setxattr_t       setxattr;
@@ -862,6 +876,7 @@ struct xlator_fops {
 	fop_fsync_cbk_t          fsync_cbk;
 	fop_opendir_cbk_t        opendir_cbk;
 	fop_readdir_cbk_t        readdir_cbk;
+	fop_readdirp_cbk_t       readdirp_cbk;
 	fop_fsyncdir_cbk_t       fsyncdir_cbk;
 	fop_statfs_cbk_t         statfs_cbk;
 	fop_setxattr_cbk_t       setxattr_cbk;