features/shard: Ensure shards are owned by the same owner/group as the original file

        Backport of: http://review.gluster.org/#/c/11874/

Change-Id: I8c905917430c32eb2e6573968722920d3b27fb55
BUG: 1253151
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: http://review.gluster.org/11927
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

2 files changed, 45 insertions, 31 deletions

diff --git a/xlators/features/shard/src/shard.c b/xlators/features/shard/src/shard.c
index 52b95472ba7..ba1579f1170 100644
--- a/xlators/features/shard/src/shard.c
+++ b/xlators/features/shard/src/shard.c
@@ -2551,8 +2551,11 @@ shard_common_mknod_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
 done:
         call_count = shard_call_count_return (frame);
-        if (call_count == 0)
+        if (call_count == 0) {
+                frame->root->uid = local->uid;
+                frame->root->gid = local->gid;
                 local->post_mknod_handler (frame, this);
+        }
 
         return 0;
 }
@@ -2581,9 +2584,14 @@ shard_common_resume_mknod (call_frame_t *frame, xlator_t *this,
         fd = local->fd;
         shard_idx_iter = local->first_block;
         last_block = local->last_block;
-        call_count = local->call_count;
+        call_count = local->call_count = local->create_count;
         local->post_mknod_handler = post_mknod_handler;
 
+        local->uid = frame->root->uid;
+        local->gid = frame->root->gid;
+        frame->root->uid = local->prebuf.ia_uid;
+        frame->root->gid = local->prebuf.ia_gid;
+
         ret = shard_inode_ctx_get_all (fd->inode, this, &ctx_tmp);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "Failed to get inode ctx for"
@@ -2697,11 +2705,13 @@ shard_post_resolve_readv_handler (call_frame_t *frame, xlator_t *this)
                 }
         }
 
-        if (local->call_count)
+        if (local->call_count) {
+                local->create_count = local->call_count;
                 shard_common_resume_mknod (frame, this,
                                            shard_post_mknod_readv_handler);
-        else
+        } else {
                 shard_readv_do (frame, this);
+        }
 
         return 0;
 }
@@ -3033,7 +3043,7 @@ next:
 }
 
 int
-shard_post_lookup_writev_handler (call_frame_t *frame, xlator_t *this)
+shard_post_lookup_shards_writev_handler (call_frame_t *frame, xlator_t *this)
 {
         shard_local_t *local = NULL;
 
@@ -3045,21 +3055,13 @@ shard_post_lookup_writev_handler (call_frame_t *frame, xlator_t *this)
                 return 0;
         }
 
-        local->postbuf = local->prebuf;
-
-        /* At this point, calculate the size of the hole if it is going to be
-         * created as part of this write.
-         */
-        if (local->offset > local->prebuf.ia_size)
-                local->hole_size = local->offset - local->prebuf.ia_size;
-
         shard_writev_do (frame, this);
 
         return 0;
 }
 
 int
-shard_post_lookup_shards_writev_handler (call_frame_t *frame, xlator_t *this)
+shard_post_mknod_writev_handler (call_frame_t *frame, xlator_t *this)
 {
         shard_local_t *local = NULL;
 
@@ -3071,13 +3073,19 @@ shard_post_lookup_shards_writev_handler (call_frame_t *frame, xlator_t *this)
                 return 0;
         }
 
-        shard_lookup_base_file (frame, this, &local->loc,
-                                shard_post_lookup_writev_handler);
+        if (!local->eexist_count) {
+                shard_writev_do (frame, this);
+        } else {
+                local->call_count = local->eexist_count;
+                shard_common_lookup_shards (frame, this, local->loc.inode,
+                                       shard_post_lookup_shards_writev_handler);
+        }
+
         return 0;
 }
 
 int
-shard_post_mknod_writev_handler (call_frame_t *frame, xlator_t *this)
+shard_post_lookup_writev_handler (call_frame_t *frame, xlator_t *this)
 {
         shard_local_t *local = NULL;
 
@@ -3089,14 +3097,19 @@ shard_post_mknod_writev_handler (call_frame_t *frame, xlator_t *this)
                 return 0;
         }
 
-        if (!local->eexist_count) {
-                shard_lookup_base_file (frame, this, &local->loc,
-                                        shard_post_lookup_writev_handler);
-        } else {
-                local->call_count = local->eexist_count;
-                shard_common_lookup_shards (frame, this, local->loc.inode,
-                                       shard_post_lookup_shards_writev_handler);
-        }
+        local->postbuf = local->prebuf;
+
+        /* At this point, calculate the size of the hole if it is going to be
+         * created as part of this write.
+         */
+        if (local->offset > local->prebuf.ia_size)
+                local->hole_size = local->offset - local->prebuf.ia_size;
+
+        if (local->create_count)
+                shard_common_resume_mknod (frame, this,
+                                           shard_post_mknod_writev_handler);
+        else
+                shard_writev_do (frame, this);
 
         return 0;
 }
@@ -3114,12 +3127,10 @@ shard_post_resolve_writev_handler (call_frame_t *frame, xlator_t *this)
                 return 0;
         }
 
-        if (local->call_count)
-                shard_common_resume_mknod (frame, this,
-                                           shard_post_mknod_writev_handler);
-        else
-                shard_lookup_base_file (frame, this, &local->loc,
-                                        shard_post_lookup_writev_handler);
+        local->create_count = local->call_count;
+
+        shard_lookup_base_file (frame, this, &local->loc,
+                                shard_post_lookup_writev_handler);
         return 0;
 }
 
diff --git a/xlators/features/shard/src/shard.h b/xlators/features/shard/src/shard.h
index 9307cee071d..e6144a29e68 100644
--- a/xlators/features/shard/src/shard.h
+++ b/xlators/features/shard/src/shard.h
@@ -149,9 +149,12 @@ typedef struct shard_local {
         int num_blocks;
         int call_count;
         int eexist_count;
+        int create_count;
         int xflag;
         int count;
         uint32_t flags;
+        uint32_t uid;
+        uint32_t gid;
         uint64_t block_size;
         uint64_t dst_block_size;
         off_t offset;