On Thu, Apr 30, 2020 at 03:50:02PM -0700, Allison Collins wrote:
> This function is similar to xfs_attr_rmtval_remove, but adapted to
> return EAGAIN for new transactions. We will use this later when we
> introduce delayed attributes. This function will eventually replace
> xfs_attr_rmtval_remove
Like Brian suggested, this changelog could probably just say that we're
hoisting the loop body into a separate function so that delayed attrs
can manage the transaction rolling.
> Signed-off-by: Allison Collins <allison.henderson@xxxxxxxxxx>
> Reviewed-by: Chandan Rajendra <chandanrlinux@xxxxxxxxx>
> ---
> fs/xfs/libxfs/xfs_attr_remote.c | 46 ++++++++++++++++++++++++++++++++---------
> fs/xfs/libxfs/xfs_attr_remote.h | 1 +
> 2 files changed, 37 insertions(+), 10 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
> index 4d51969..02d1a44 100644
> --- a/fs/xfs/libxfs/xfs_attr_remote.c
> +++ b/fs/xfs/libxfs/xfs_attr_remote.c
> @@ -681,7 +681,7 @@ xfs_attr_rmtval_remove(
> xfs_dablk_t lblkno;
> int blkcnt;
> int error = 0;
> - int done = 0;
> + int retval = 0;
>
> trace_xfs_attr_rmtval_remove(args);
>
> @@ -693,14 +693,10 @@ xfs_attr_rmtval_remove(
> */
> lblkno = args->rmtblkno;
> blkcnt = args->rmtblkcnt;
> - while (!done) {
> - error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
> - XFS_BMAPI_ATTRFORK, 1, &done);
> - if (error)
> - return error;
> - error = xfs_defer_finish(&args->trans);
> - if (error)
> - return error;
> + do {
> + retval = __xfs_attr_rmtval_remove(args);
> + if (retval && retval != EAGAIN)
> + return retval;
>
> /*
> * Close out trans and start the next one in the chain.
> @@ -708,6 +704,36 @@ xfs_attr_rmtval_remove(
> error = xfs_trans_roll_inode(&args->trans, args->dp);
> if (error)
> return error;
> - }
> + } while (retval == -EAGAIN);
> +
> return 0;
> }
> +
> +/*
> + * Remove the value associated with an attribute by deleting the out-of-line
> + * buffer that it is stored on. Returns EAGAIN for the caller to refresh the
> + * transaction and recall the function
recall the function...?
Oh. "re-call" the function.
> + */
> +int
> +__xfs_attr_rmtval_remove(
xfs_attr_rmtval_remove_extent() ?
--D
> + struct xfs_da_args *args)
> +{
> + int error, done;
> +
> + /*
> + * Unmap value blocks for this attr.
> + */
> + error = xfs_bunmapi(args->trans, args->dp, args->rmtblkno,
> + args->rmtblkcnt, XFS_BMAPI_ATTRFORK, 1, &done);
> + if (error)
> + return error;
> +
> + error = xfs_defer_finish(&args->trans);
> + if (error)
> + return error;
> +
> + if (!done)
> + return -EAGAIN;
> +
> + return error;
> +}
> diff --git a/fs/xfs/libxfs/xfs_attr_remote.h b/fs/xfs/libxfs/xfs_attr_remote.h
> index eff5f95..ee3337b 100644
> --- a/fs/xfs/libxfs/xfs_attr_remote.h
> +++ b/fs/xfs/libxfs/xfs_attr_remote.h
> @@ -14,4 +14,5 @@ int xfs_attr_rmtval_remove(struct xfs_da_args *args);
> int xfs_attr_rmtval_stale(struct xfs_inode *ip, struct xfs_bmbt_irec *map,
> xfs_buf_flags_t incore_flags);
> int xfs_attr_rmtval_invalidate(struct xfs_da_args *args);
> +int __xfs_attr_rmtval_remove(struct xfs_da_args *args);
> #endif /* __XFS_ATTR_REMOTE_H__ */
> --
> 2.7.4
>
