From 6d85ed05e16e7ff747025c8374f23d7d81c98540 Mon Sep 17 00:00:00 2001 From: Alexander Block Date: Wed, 1 Aug 2012 14:48:59 +0200 Subject: [PATCH] Btrfs: don't treat top/root directory inode as deleted/reused We can't do the deleted/reused logic for top/root inodes as it would create a stream that tries to delete and recreate the root dir. Reported-by: Alex Lyakas Signed-off-by: Alexander Block --- fs/btrfs/send.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index a4011a9..d17d75e 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -2627,6 +2627,12 @@ static int can_rmdir(struct send_ctx *sctx, u64 dir, u64 send_progress) struct btrfs_key loc; struct btrfs_dir_item *di; + /* + * Don't try to rmdir the top/root subvolume dir. + */ + if (dir == BTRFS_FIRST_FREE_OBJECTID) + return 0; + path = alloc_path_for_send(); if (!path) return -ENOMEM; @@ -2687,6 +2693,12 @@ static int process_recorded_refs(struct send_ctx *sctx) verbose_printk("btrfs: process_recorded_refs %llu\n", sctx->cur_ino); + /* + * This should never happen as the root dir always has the same ref + * which is always '..' + */ + BUG_ON(sctx->cur_ino <= BTRFS_FIRST_FREE_OBJECTID); + valid_path = fs_path_alloc(sctx); if (!valid_path) { ret = -ENOMEM; @@ -4094,7 +4106,14 @@ static int changed_inode(struct send_ctx *sctx, right_gen = btrfs_inode_generation(sctx->right_path->nodes[0], right_ii); - if (left_gen != right_gen) + + /* + * The cur_ino = root dir case is special here. We can't treat + * the inode as deleted+reused because it would generate a + * stream that tries to delete/mkdir the root dir. + */ + if (left_gen != right_gen && + sctx->cur_ino != BTRFS_FIRST_FREE_OBJECTID) sctx->cur_inode_new_gen = 1; } -- 2.7.4