Re: [PATCH 04/10] libxfs: retain ifork_ops when flushing inode

[Bill O'Donnell <billodo@redhat.com>]

On Mon, Apr 22, 2019 at 08:45:15AM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> Retain the ifork ops used to validate the inode so that we can use the
> same one to iflush it.  xfs_repair phase 6 can use multiple transactions
> to fix various inode problems, which means that the inode might not be
> fully fixed when each transaction commits.
> 
> This can be a particular problem if there's a shortform directory with
> both invalid directory entries and incorrect i8count.  Phase 3 will set
> the parent inode to "0" to signal to phase 6 that it needs to reset the
> parent and i8count, but phase 6 starts a transaction to junk the bad
> entries which fail to commit because the parent is invalid:
> 
> fixing i8count in inode 69022994673
> Invalid inode number 0x0
> xfs_dir_ino_validate: XFS_ERROR_REPORT
> Metadata corruption detected at 0x464eb0, inode 0x10121750f1 data fork
> xfs_repair: warning - iflush_int failed (-117)
> 
> And thus the inode fixes never get written out.
> 
> Reported-by: Arkadiusz Miskiewicz <arekm@maven.pl>
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

Reviewed-by: Bill O'Donnell <billodo@redhat.com>

> ---
>  include/xfs_inode.h |    1 +
>  libxfs/rdwr.c       |    1 +
>  libxfs/util.c       |    2 +-
>  3 files changed, 3 insertions(+), 1 deletion(-)
> 
> 
> diff --git a/include/xfs_inode.h b/include/xfs_inode.h
> index 79ec3a2d..e1e8b430 100644
> --- a/include/xfs_inode.h
> +++ b/include/xfs_inode.h
> @@ -51,6 +51,7 @@ typedef struct xfs_inode {
>  
>  	xfs_fsize_t		i_size;		/* in-memory size */
>  	const struct xfs_dir_ops *d_ops;	/* directory ops vector */
> +	struct xfs_ifork_ops	*i_fork_ops;	/* fork verifiers */
>  	struct inode		i_vnode;
>  } xfs_inode_t;
>  
> diff --git a/libxfs/rdwr.c b/libxfs/rdwr.c
> index a00360e7..69d5abb2 100644
> --- a/libxfs/rdwr.c
> +++ b/libxfs/rdwr.c
> @@ -1391,6 +1391,7 @@ libxfs_iget(
>  		return error;
>  	}
>  
> +	ip->i_fork_ops = ifork_ops;
>  	if (!libxfs_inode_verify_forks(ip, ifork_ops)) {
>  		libxfs_irele(ip);
>  		return -EFSCORRUPTED;
> diff --git a/libxfs/util.c b/libxfs/util.c
> index 4ac151e6..2e3b9d51 100644
> --- a/libxfs/util.c
> +++ b/libxfs/util.c
> @@ -422,7 +422,7 @@ libxfs_iflush_int(xfs_inode_t *ip, xfs_buf_t *bp)
>  		VFS_I(ip)->i_version++;
>  
>  	/* Check the inline fork data before we write out. */
> -	if (!libxfs_inode_verify_forks(ip, &xfs_default_ifork_ops))
> +	if (!libxfs_inode_verify_forks(ip, ip->i_fork_ops))
>  		return -EFSCORRUPTED;
>  
>  	/*
>