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Btrfs: fix send dealing with file renames and directory moves
This fixes a case that the commit titled: Btrfs: fix infinite path build loops in incremental send didn't cover. If the parent-child relationship between 2 directories is inverted, both get renamed, and the former parent has a file that got renamed too (but remains a child of that directory), the incremental send operation would use the file's old path after sending an unlink operation for that old path, causing receive to fail on future operations like changing owner, permissions or utimes of the corresponding inode. This is not a regression from the commit mentioned before, as without that commit we would fall into the issues that commit fixed, so it's just one case that wasn't covered before. Simple steps to reproduce this issue are: $ mkfs.btrfs -f /dev/sdb3 $ mount /dev/sdb3 /mnt/btrfs $ mkdir -p /mnt/btrfs/a/b/c/d $ touch /mnt/btrfs/a/b/c/d/file $ mkdir -p /mnt/btrfs/a/b/x $ btrfs subvol snapshot -r /mnt/btrfs /mnt/btrfs/snap1 $ mv /mnt/btrfs/a/b/x /mnt/btrfs/a/b/c/x2 $ mv /mnt/btrfs/a/b/c/d /mnt/btrfs/a/b/c/x2/d2 $ mv /mnt/btrfs/a/b/c/x2/d2/file /mnt/btrfs/a/b/c/x2/d2/file2 $ btrfs subvol snapshot -r /mnt/btrfs /mnt/btrfs/snap2 $ btrfs send -p /mnt/btrfs/snap1 /mnt/btrfs/snap2 > /tmp/incremental.send A patch to update the test btrfs/030 from xfstests, so that it covers this case, will be submitted soon. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
parent
98cfee2143
commit
03cb4fb9d8
1 changed files with 1 additions and 9 deletions
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@ -2131,8 +2131,6 @@ static int get_cur_path(struct send_ctx *sctx, u64 ino, u64 gen,
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u64 parent_inode = 0;
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u64 parent_gen = 0;
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int stop = 0;
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u64 start_ino = ino;
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u64 start_gen = gen;
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int skip_name_cache = 0;
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name = fs_path_alloc();
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@ -2144,7 +2142,6 @@ static int get_cur_path(struct send_ctx *sctx, u64 ino, u64 gen,
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if (is_waiting_for_move(sctx, ino))
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skip_name_cache = 1;
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again:
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dest->reversed = 1;
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fs_path_reset(dest);
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@ -2159,13 +2156,8 @@ static int get_cur_path(struct send_ctx *sctx, u64 ino, u64 gen,
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stop = 1;
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if (!skip_name_cache &&
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is_waiting_for_move(sctx, parent_inode)) {
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ino = start_ino;
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gen = start_gen;
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stop = 0;
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is_waiting_for_move(sctx, parent_inode))
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skip_name_cache = 1;
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goto again;
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}
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ret = fs_path_add_path(dest, name);
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if (ret < 0)
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