On 06/06/2018 04:26 PM, Qu Wenruo wrote:
> It looks like that around 2014, btrfs kernel has a regression that would
> cause offset-by-one ram_bytes for inline extent.
>
> Add the ability to repair it in original mode.
>
> Reported-by: Steve Leung <sjle...@shaw.ca>
> Signed-off-by: Qu Wenruo <w...@suse.com>
Reviewed-by: Su Yue <suy.f...@cn.fujitsu.com>
> ---
> changelog:
> v2:
> Add extra output for print_inode_error().
> Reword the repair output message.
> Clear the error bitmap if repaired.
> ---
> check/main.c | 47 +++++++++++++++++++++++++++++++++++++++++--
> check/mode-original.h | 1 +
> 2 files changed, 46 insertions(+), 2 deletions(-)
>
> diff --git a/check/main.c b/check/main.c
> index 52ef181add61..c739c094cef3 100644
> --- a/check/main.c
> +++ b/check/main.c
> @@ -578,6 +578,8 @@ static void print_inode_error(struct btrfs_root *root,
> struct inode_record *rec)
> fprintf(stderr, ", orphan file extent");
> if (errors & I_ERR_ODD_INODE_FLAGS)
> fprintf(stderr, ", odd inode flags");
> + if (errors & I_ERR_INLINE_RAM_BYTES_WRONG)
> + fprintf(stderr, ", invalid inline ram bytes");
> fprintf(stderr, "\n");
> /* Print the orphan extents if needed */
> if (errors & I_ERR_FILE_EXTENT_ORPHAN)
> @@ -1483,6 +1485,9 @@ static int process_file_extent(struct btrfs_root *root,
> } else {
> if (num_bytes > max_inline_size)
> rec->errors |= I_ERR_FILE_EXTENT_TOO_LARGE;
> + if (btrfs_file_extent_inline_item_len(eb, item) !=
> + num_bytes)
> + rec->errors |= I_ERR_INLINE_RAM_BYTES_WRONG;
> }
> rec->found_size += num_bytes;
> num_bytes = (num_bytes + mask) & ~mask;
> @@ -2534,6 +2539,41 @@ out:
> return ret;
> }
>
> +static int repair_inline_ram_bytes(struct btrfs_trans_handle *trans,
> + struct btrfs_root *root,
> + struct btrfs_path *path,
> + struct inode_record *rec)
> +{
> + struct btrfs_key key;
> + struct btrfs_file_extent_item *fi;
> + struct btrfs_item *i;
> + u64 on_disk_item_len;
> + int ret;
> +
> + key.objectid = rec->ino;
> + key.offset = 0;
> + key.type = BTRFS_EXTENT_DATA_KEY;
> +
> + ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
> + if (ret > 0)
> + ret = -ENOENT;
> + if (ret < 0)
> + goto out;
> +
> + i = btrfs_item_nr(path->slots[0]);
> + on_disk_item_len = btrfs_file_extent_inline_item_len(path->nodes[0], i);
> + fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
> + struct btrfs_file_extent_item);
> + btrfs_set_file_extent_ram_bytes(path->nodes[0], fi, on_disk_item_len);
> + btrfs_mark_buffer_dirty(path->nodes[0]);
> + printf("Repaired inline ram_bytes for root %llu ino %llu\n",
> + root->objectid, rec->ino);
> + rec->errors &= ~I_ERR_INLINE_RAM_BYTES_WRONG;
> +out:
> + btrfs_release_path(path);
> + return ret;
> +}
> +
> static int try_repair_inode(struct btrfs_root *root, struct inode_record
> *rec)
> {
> struct btrfs_trans_handle *trans;
> @@ -2545,8 +2585,9 @@ static int try_repair_inode(struct btrfs_root *root,
> struct inode_record *rec)
> I_ERR_LINK_COUNT_WRONG |
> I_ERR_NO_INODE_ITEM |
> I_ERR_FILE_EXTENT_ORPHAN |
> - I_ERR_FILE_EXTENT_DISCOUNT|
> - I_ERR_FILE_NBYTES_WRONG)))
> + I_ERR_FILE_EXTENT_DISCOUNT |
> + I_ERR_FILE_NBYTES_WRONG |
> + I_ERR_INLINE_RAM_BYTES_WRONG)))
> return rec->errors;
>
> /*
> @@ -2575,6 +2616,8 @@ static int try_repair_inode(struct btrfs_root *root,
> struct inode_record *rec)
> ret = repair_inode_nlinks(trans, root, &path, rec);
> if (!ret && rec->errors & I_ERR_FILE_NBYTES_WRONG)
> ret = repair_inode_nbytes(trans, root, &path, rec);
> + if (!ret && rec->errors & I_ERR_INLINE_RAM_BYTES_WRONG)
> + ret = repair_inline_ram_bytes(trans, root, &path, rec);
> btrfs_commit_transaction(trans, root);
> btrfs_release_path(&path);
> return ret;
> diff --git a/check/mode-original.h b/check/mode-original.h
> index 13cfa5b9e1b3..ec2842e0b3be 100644
> --- a/check/mode-original.h
> +++ b/check/mode-original.h
> @@ -187,6 +187,7 @@ struct file_extent_hole {
> #define I_ERR_FILE_EXTENT_ORPHAN (1 << 14)
> #define I_ERR_FILE_EXTENT_TOO_LARGE (1 << 15)
> #define I_ERR_ODD_INODE_FLAGS (1 << 16)
> +#define I_ERR_INLINE_RAM_BYTES_WRONG (1 << 17)
>
> struct inode_record {
> struct list_head backrefs;
>
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