cluster/afr: Preserve generation number along with inode in lookup and creation fops.

This fixes fuse_create_cbk conflict warnings and random errors while
running dbench (typically open handle failure with ENOENT).

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

BUG: 315 (generation number support)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=315

3 files changed, 26 insertions, 3 deletions

diff --git a/xlators/cluster/afr/src/afr-dir-write.c b/xlators/cluster/afr/src/afr-dir-write.c
index 55fc1a006..5387ceb3d 100644
--- a/xlators/cluster/afr/src/afr-dir-write.c
+++ b/xlators/cluster/afr/src/afr-dir-write.c
@@ -101,6 +101,7 @@ afr_create_unwind (call_frame_t *frame, xlator_t *this)
                 }
 
                 unwind_buf->st_ino = local->cont.create.ino;
+                unwind_buf->st_dev = local->cont.create.gen;
 
                 local->cont.create.preparent.st_ino  = local->cont.create.parent_ino;
                 local->cont.create.postparent.st_ino = local->cont.create.parent_ino;
@@ -178,6 +179,7 @@ afr_create_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                         afr_itransform (buf->st_ino,
                                                         priv->child_count,
                                                         child_index);
+                                local->cont.create.gen = buf->st_dev;
 
                                 if (priv->read_child >= 0) {
                                         afr_set_read_child (this, inode, 
@@ -193,6 +195,7 @@ afr_create_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                         afr_itransform (buf->st_ino,
                                                         priv->child_count,
                                                         local->first_up_child);
+                                local->cont.create.gen = buf->st_dev;
                         }
                         
                         if (child_index == local->read_child_index) {
@@ -383,6 +386,7 @@ afr_mknod_unwind (call_frame_t *frame, xlator_t *this)
                 }
 
                 unwind_buf->st_ino = local->cont.mknod.ino;
+                unwind_buf->st_dev = local->cont.mknod.gen;
 
                 local->cont.mknod.preparent.st_ino  = local->cont.mknod.parent_ino;
                 local->cont.mknod.postparent.st_ino = local->cont.mknod.parent_ino;
@@ -429,6 +433,7 @@ afr_mknod_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 					afr_itransform (buf->st_ino,
 							priv->child_count,
 							child_index);
+                                local->cont.mknod.gen   = buf->st_dev;
 
                                 if (priv->read_child >= 0) {
                                         afr_set_read_child (this, inode,
@@ -444,6 +449,7 @@ afr_mknod_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                         afr_itransform (buf->st_ino,
                                                         priv->child_count,
                                                         local->first_up_child);
+                                local->cont.mknod.gen = buf->st_dev;
                         }
 
                         if (child_index == local->read_child_index) {
@@ -630,6 +636,7 @@ afr_mkdir_unwind (call_frame_t *frame, xlator_t *this)
                 }
 
                 unwind_buf->st_ino = local->cont.mkdir.ino;
+                unwind_buf->st_dev = local->cont.mkdir.gen;
 
                 local->cont.mkdir.preparent.st_ino  = local->cont.mkdir.parent_ino;
                 local->cont.mkdir.postparent.st_ino = local->cont.mkdir.parent_ino;
@@ -677,6 +684,7 @@ afr_mkdir_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                         afr_itransform (buf->st_ino,
                                                         priv->child_count,
                                                         child_index);
+                                local->cont.mkdir.gen = buf->st_dev;
 
                                 if (priv->read_child >= 0) {
                                         afr_set_read_child (this, inode,
@@ -692,6 +700,7 @@ afr_mkdir_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                         afr_itransform (buf->st_ino,
                                                         priv->child_count,
                                                         local->first_up_child);
+                                local->cont.mkdir.gen = buf->st_dev;
                         }
                         
                         if (child_index == local->read_child_index) {
@@ -1116,6 +1125,7 @@ afr_symlink_unwind (call_frame_t *frame, xlator_t *this)
                 }
 
                 unwind_buf->st_ino = local->cont.symlink.ino;
+                unwind_buf->st_dev = local->cont.symlink.gen;
 
                 local->cont.symlink.preparent.st_ino  = local->cont.symlink.parent_ino;
                 local->cont.symlink.postparent.st_ino = local->cont.symlink.parent_ino;
@@ -1161,7 +1171,8 @@ afr_symlink_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 				local->cont.symlink.ino = 
 					afr_itransform (buf->st_ino, priv->child_count,
 							child_index);
-                                
+                                local->cont.symlink.gen = buf->st_dev;
+
                                 if (priv->read_child >= 0) {
                                         afr_set_read_child (this, inode,
                                                             priv->read_child);
@@ -1176,6 +1187,7 @@ afr_symlink_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                         afr_itransform (buf->st_ino,
                                                         priv->child_count,
                                                         local->first_up_child);
+                                local->cont.symlink.gen = buf->st_dev;
                         }
 
                         if (child_index == local->read_child_index) {
diff --git a/xlators/cluster/afr/src/afr.c b/xlators/cluster/afr/src/afr.c
index b82f412bf..98eaeb6dd 100644
--- a/xlators/cluster/afr/src/afr.c
+++ b/xlators/cluster/afr/src/afr.c
@@ -567,14 +567,18 @@ afr_lookup_done (call_frame_t *frame, xlator_t *this, struct stat *lookup_buf)
 
         if (local->cont.lookup.ino) {
                 local->cont.lookup.buf.st_ino = local->cont.lookup.ino;
+                local->cont.lookup.buf.st_dev = local->cont.lookup.gen;
         }
 
         if (local->op_ret == 0) {
                 /* KLUDGE: assuming DHT will not itransform in 
                    revalidate */
-                if (local->cont.lookup.inode->ino)
+                if (local->cont.lookup.inode->ino) {
                         local->cont.lookup.buf.st_ino = 
                                 local->cont.lookup.inode->ino;
+                        local->cont.lookup.buf.st_dev =
+                                local->cont.lookup.inode->generation;
+                }
         }
 
         if (local->success_count && local->enoent_count) {
@@ -694,6 +698,7 @@ afr_fresh_lookup_cbk (call_frame_t *frame, void *cookie,
                                 afr_itransform (buf->st_ino,
                                                 priv->child_count,
                                                 first_up_child);
+                        local->cont.lookup.gen = buf->st_dev;
                 }
 
 		if (local->success_count == 0) {
@@ -709,7 +714,6 @@ afr_fresh_lookup_cbk (call_frame_t *frame, void *cookie,
                         lookup_buf->st_ino = afr_itransform (buf->st_ino,
                                                              priv->child_count,
                                                              child_index);
-
                         if (priv->read_child >= 0) {
                                 afr_set_read_child (this,
                                                     local->cont.lookup.inode,
@@ -811,6 +815,7 @@ afr_revalidate_lookup_cbk (call_frame_t *frame, void *cookie,
                                 afr_itransform (buf->st_ino,
                                                 priv->child_count,
                                                 first_up_child);
+                        local->cont.lookup.gen = buf->st_dev;
                 }
 
 		/* in case of revalidate, we need to send stat of the
diff --git a/xlators/cluster/afr/src/afr.h b/xlators/cluster/afr/src/afr.h
index 6a1c53cee..09f76351a 100644
--- a/xlators/cluster/afr/src/afr.h
+++ b/xlators/cluster/afr/src/afr.h
@@ -254,6 +254,7 @@ typedef struct _afr_local {
                         struct stat read_child_buf;
                         struct stat postparent;
                         ino_t ino;
+                        uint64_t gen;
                         ino_t parent_ino;
 			dict_t *xattr;
                         gf_boolean_t is_revalidate;
@@ -404,6 +405,7 @@ typedef struct _afr_local {
 		
 		struct {
 			ino_t ino;
+                        uint64_t gen;
                         ino_t parent_ino;
 			fd_t *fd;
 			int32_t flags;
@@ -417,6 +419,7 @@ typedef struct _afr_local {
 
 		struct {
 			ino_t ino;
+                        uint64_t gen;
                         ino_t parent_ino;
 			dev_t dev;
 			mode_t mode;
@@ -429,6 +432,7 @@ typedef struct _afr_local {
 
 		struct {
 			ino_t ino;
+                        uint64_t gen;
                         ino_t parent_ino;
 			int32_t mode;
 			inode_t *inode;
@@ -468,6 +472,7 @@ typedef struct _afr_local {
 
 		struct {
 			ino_t ino;
+                        uint64_t gen;
                         ino_t parent_ino;
 			inode_t *inode;
 			struct stat buf;
@@ -478,6 +483,7 @@ typedef struct _afr_local {
 
 		struct {
 			ino_t ino;
+                        uint64_t gen;
                         ino_t parent_ino;
 			inode_t *inode;
 			struct stat buf;