Btrfs: update send_progress at correct places

Updating send_progress in process_recorded_refs was not correct.
It got updated too early in the cur_inode_new_gen case.

Reported-by: Alex Lyakas <alex.bolshoy.btrfs@gmail.com>
Reported-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Alexander Block <ablock84@googlemail.com>

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 02e901a..f618224 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -2886,12 +2886,6 @@ verbose_printk("btrfs: process_recorded_refs %llu\n", sctx->cur_ino);
                }
        }
 
-       /*
-        * Current inode is now at it's new position, so we must increase
-        * send_progress
-        */
-       sctx->send_progress = sctx->cur_ino + 1;
-
        ret = 0;
 
 out:
@@ -3896,6 +3890,15 @@ static int process_recorded_refs_if_needed(struct send_ctx *sctx, int at_end)
                goto out;
 
        ret = process_recorded_refs(sctx);
+       if (ret < 0)
+               goto out;
+
+       /*
+        * We have processed the refs and thus need to advance send_progress.
+        * Now, calls to get_cur_xxx will take the updated refs of the current
+        * inode into account.
+        */
+       sctx->send_progress = sctx->cur_ino + 1;
 
 out:
        return ret;
@@ -3993,6 +3996,12 @@ static int changed_inode(struct send_ctx *sctx,
 
        sctx->cur_ino = key->objectid;
        sctx->cur_inode_new_gen = 0;
+
+       /*
+        * Set send_progress to current inode. This will tell all get_cur_xxx
+        * functions that the current inode's refs are not updated yet. Later,
+        * when process_recorded_refs is finished, it is set to cur_ino + 1.
+        */
        sctx->send_progress = sctx->cur_ino;
 
        if (result == BTRFS_COMPARE_TREE_NEW ||
@@ -4066,6 +4075,11 @@ static int changed_inode(struct send_ctx *sctx,
                        ret = process_all_refs(sctx, BTRFS_COMPARE_TREE_NEW);
                        if (ret < 0)
                                goto out;
+                       /*
+                        * Advance send_progress now as we did not get into
+                        * process_recorded_refs_if_needed in the new_gen case.
+                        */
+                       sctx->send_progress = sctx->cur_ino + 1;
                        ret = process_all_extents(sctx);
                        if (ret < 0)
                                goto out;