On 25.01.2018 20:02, Liu Bo wrote:
> The highest objectid, which is assigned to new inode, is decided at
> the time of initializing fs roots. However, in cases where log replay
> gets processed, the btree which fs root owns might be changed, so we
> have to search it again for the highest objectid, otherwise creating
> new inode would end up with -EEXIST.
>
> cc: <sta...@vger.kernel.org> v4.4-rc6+
> Fixes: f32e48e92596 ("Btrfs: Initialize btrfs_root->highest_objectid when
> loading tree root and subvolume roots")
> Signed-off-by: Liu Bo <bo.li....@oracle.com>
> ---
> fs/btrfs/tree-log.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
> index a7e6235..646cdbf 100644
> --- a/fs/btrfs/tree-log.c
> +++ b/fs/btrfs/tree-log.c
> @@ -28,6 +28,7 @@
> #include "hash.h"
> #include "compression.h"
> #include "qgroup.h"
> +#include "inode-map.h"
>
> /* magic values for the inode_only field in btrfs_log_inode:
> *
> @@ -5715,6 +5716,24 @@ int btrfs_recover_log_trees(struct btrfs_root
> *log_root_tree)
> path);
> }
>
> + if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) {
> + struct btrfs_root *root = wc.replay_dest;
> +
> + btrfs_release_path(path);
> +
> + /*
> + * We have just replayed everything, and the highest
> + * objectid of fs roots probably has changed in case
> + * some inode_item's got replayed.
> + */
> + /*
nit: No need to start a new multiline comment
> + * root->objectid_mutex is not acquired as log replay
> + * could only happen during mount.
> + */
> + ret = btrfs_find_highest_objectid(root,
> + &root->highest_objectid);
> + }
> +
> key.offset = found_key.offset - 1;
> wc.replay_dest->log_root = NULL;
> free_extent_buffer(log->node);
>
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