Re: [PATCH v22 12/16] xfs: Remove unused xfs_attr_*_args

Darrick J. Wong
2021-07-28T19:31:27Z

On Mon, Jul 26, 2021 at 11:20:49PM -0700, Allison Henderson wrote:
> Remove xfs_attr_set_args, xfs_attr_remove_args, and xfs_attr_trans_roll.
> These high level loops are now driven by the delayed operations code,
> and can be removed.
>
> Additionally collapse in the leaf_bp parameter of xfs_attr_set_iter
> since we only have one caller that passes dac->leaf_bp
>
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>

More random ideas for cleanups, sorry...

> ---
> fs/xfs/libxfs/xfs_attr.c | 96 +++--------------------------------------
> fs/xfs/libxfs/xfs_attr.h | 10 ++---
> fs/xfs/libxfs/xfs_attr_remote.c | 1 -
> fs/xfs/xfs_attr_item.c | 6 +--
> 4 files changed, 10 insertions(+), 103 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> index c447c21..ec03a7b 100644
> --- a/fs/xfs/libxfs/xfs_attr.c
> +++ b/fs/xfs/libxfs/xfs_attr.c
> @@ -244,67 +244,13 @@ xfs_attr_is_shortform(
> ip->i_afp->if_nextents == 0);
> }
>
> -/*
> - * Checks to see if a delayed attribute transaction should be rolled. If so,
> - * transaction is finished or rolled as needed.
> - */
> -STATIC int
> -xfs_attr_trans_roll(
> - struct xfs_delattr_context *dac)
> -{
> - struct xfs_da_args *args = dac->da_args;
> - int error;
> -
> - if (dac->flags & XFS_DAC_DEFER_FINISH) {
> - /*
> - * The caller wants us to finish all the deferred ops so that we
> - * avoid pinning the log tail with a large number of deferred
> - * ops.
> - */
> - dac->flags &= ~XFS_DAC_DEFER_FINISH;
> - error = xfs_defer_finish(&args->trans);
> - } else
> - error = xfs_trans_roll_inode(&args->trans, args->dp);
> -
> - return error;
> -}
> -
> -/*
> - * Set the attribute specified in @args.
> - */
> -int
> -xfs_attr_set_args(
> - struct xfs_da_args *args)
> -{
> - struct xfs_buf *leaf_bp = NULL;
> - int error = 0;
> - struct xfs_delattr_context dac = {
> - .da_args = args,
> - };
> -
> - do {
> - error = xfs_attr_set_iter(&dac, &leaf_bp);
> - if (error != -EAGAIN)
> - break;
> -
> - error = xfs_attr_trans_roll(&dac);
> - if (error) {
> - if (leaf_bp)
> - xfs_trans_brelse(args->trans, leaf_bp);
> - return error;
> - }
> - } while (true);
> -
> - return error;
> -}
> -
> STATIC int
> xfs_attr_sf_addname(
> - struct xfs_delattr_context *dac,
> - struct xfs_buf **leaf_bp)
> + struct xfs_delattr_context *dac)
> {
> struct xfs_da_args *args = dac->da_args;
> struct xfs_inode *dp = args->dp;
> + struct xfs_buf **leaf_bp = &dac->leaf_bp;

Can you remove this local variable from this function completely?

> int error = 0;
>
> /*
> @@ -337,7 +283,6 @@ xfs_attr_sf_addname(
> * add.
> */
> trace_xfs_attr_sf_addname_return(XFS_DAS_UNINIT, args->dp);
> - dac->flags |= XFS_DAC_DEFER_FINISH;
> return -EAGAIN;
> }
>
> @@ -350,10 +295,10 @@ xfs_attr_sf_addname(
> */
> int
> xfs_attr_set_iter(
> - struct xfs_delattr_context *dac,
> - struct xfs_buf **leaf_bp)
> + struct xfs_delattr_context *dac)
> {
> struct xfs_da_args *args = dac->da_args;
> + struct xfs_buf **leaf_bp = &dac->leaf_bp;

And here too? It's easier to figure out what the code is doing if I
don't have to reparse through a double pointer.

> struct xfs_inode *dp = args->dp;
> struct xfs_buf *bp = NULL;
> int forkoff, error = 0;
> @@ -370,7 +315,7 @@ xfs_attr_set_iter(
> * release the hold once we return with a clean transaction.
> */
> if (xfs_attr_is_shortform(dp))
> - return xfs_attr_sf_addname(dac, leaf_bp);
> + return xfs_attr_sf_addname(dac);
> if (*leaf_bp != NULL) {
> xfs_trans_bhold_release(args->trans, *leaf_bp);
> *leaf_bp = NULL;

if (dac->leaf_bp != NULL) {
xfs_trans_bhold_release(args->trans, dac->leaf_bp);
dac->leaf_bp = NULL;
}

etc.

--D

> @@ -396,7 +341,6 @@ xfs_attr_set_iter(
> * be a node, so we'll fall down into the node
> * handling code below
> */
> - dac->flags |= XFS_DAC_DEFER_FINISH;
> trace_xfs_attr_set_iter_return(
> dac->dela_state, args->dp);
> return -EAGAIN;
> @@ -685,32 +629,6 @@ xfs_has_attr(
> }
>
> /*
> - * Remove the attribute specified in @args.
> - */
> -int
> -xfs_attr_remove_args(
> - struct xfs_da_args *args)
> -{
> - int error;
> - struct xfs_delattr_context dac = {
> - .da_args = args,
> - };
> -
> - do {
> - error = xfs_attr_remove_iter(&dac);
> - if (error != -EAGAIN)
> - break;
> -
> - error = xfs_attr_trans_roll(&dac);
> - if (error)
> - return error;
> -
> - } while (true);
> -
> - return error;
> -}
> -
> -/*
> * Note: If args->value is NULL the attribute will be removed, just like the
> * Linux ->setattr API.
> */
> @@ -1272,7 +1190,6 @@ xfs_attr_node_addname(
> * this. dela_state is still unset by this function at
> * this point.
> */
> - dac->flags |= XFS_DAC_DEFER_FINISH;
> trace_xfs_attr_node_addname_return(
> dac->dela_state, args->dp);
> return -EAGAIN;
> @@ -1287,7 +1204,6 @@ xfs_attr_node_addname(
> error = xfs_da3_split(state);
> if (error)
> goto out;
> - dac->flags |= XFS_DAC_DEFER_FINISH;
> } else {
> /*
> * Addition succeeded, update Btree hashvals.
> @@ -1538,7 +1454,6 @@ xfs_attr_remove_iter(
> if (error)
> goto out;
> dac->dela_state = XFS_DAS_RM_NAME;
> - dac->flags |= XFS_DAC_DEFER_FINISH;
> return -EAGAIN;
> }
>
> @@ -1565,7 +1480,6 @@ xfs_attr_remove_iter(
> if (error)
> goto out;
>
> - dac->flags |= XFS_DAC_DEFER_FINISH;
> dac->dela_state = XFS_DAS_RM_SHRINK;
> trace_xfs_attr_remove_iter_return(
> dac->dela_state, args->dp);
> diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
> index 72b0ea5..c0c92bd3 100644
> --- a/fs/xfs/libxfs/xfs_attr.h
> +++ b/fs/xfs/libxfs/xfs_attr.h
> @@ -457,9 +457,8 @@ enum xfs_delattr_state {
> /*
> * Defines for xfs_delattr_context.flags
> */
> -#define XFS_DAC_DEFER_FINISH 0x01 /* finish the transaction */
> -#define XFS_DAC_LEAF_ADDNAME_INIT 0x02 /* xfs_attr_leaf_addname init*/
> -#define XFS_DAC_DELAYED_OP_INIT 0x04 /* delayed operations init*/
> +#define XFS_DAC_LEAF_ADDNAME_INIT 0x01 /* xfs_attr_leaf_addname init*/
> +#define XFS_DAC_DELAYED_OP_INIT 0x02 /* delayed operations init*/
>
> /*
> * Context used for keeping track of delayed attribute operations
> @@ -517,11 +516,8 @@ bool xfs_attr_is_leaf(struct xfs_inode *ip);
> int xfs_attr_get_ilocked(struct xfs_da_args *args);
> int xfs_attr_get(struct xfs_da_args *args);
> int xfs_attr_set(struct xfs_da_args *args);
> -int xfs_attr_set_args(struct xfs_da_args *args);
> -int xfs_attr_set_iter(struct xfs_delattr_context *dac,
> - struct xfs_buf **leaf_bp);
> +int xfs_attr_set_iter(struct xfs_delattr_context *dac);
> int xfs_has_attr(struct xfs_da_args *args);
> -int xfs_attr_remove_args(struct xfs_da_args *args);
> int xfs_attr_remove_iter(struct xfs_delattr_context *dac);
> bool xfs_attr_namecheck(const void *name, size_t length);
> void xfs_delattr_context_init(struct xfs_delattr_context *dac,
> diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
> index 1669043..e29c2b9 100644
> --- a/fs/xfs/libxfs/xfs_attr_remote.c
> +++ b/fs/xfs/libxfs/xfs_attr_remote.c
> @@ -695,7 +695,6 @@ xfs_attr_rmtval_remove(
> * the parent
> */
> if (!done) {
> - dac->flags |= XFS_DAC_DEFER_FINISH;
> trace_xfs_attr_rmtval_remove_return(dac->dela_state, args->dp);
> return -EAGAIN;
> }
> diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
> index 44c44d9..12a0151 100644
> --- a/fs/xfs/xfs_attr_item.c
> +++ b/fs/xfs/xfs_attr_item.c
> @@ -285,7 +285,6 @@ STATIC int
> xfs_trans_attr_finish_update(
> struct xfs_delattr_context *dac,
> struct xfs_attrd_log_item *attrdp,
> - struct xfs_buf **leaf_bp,
> uint32_t op_flags)
> {
> struct xfs_da_args *args = dac->da_args;
> @@ -300,7 +299,7 @@ xfs_trans_attr_finish_update(
> switch (op) {
> case XFS_ATTR_OP_FLAGS_SET:
> args->op_flags |= XFS_DA_OP_ADDNAME;
> - error = xfs_attr_set_iter(dac, leaf_bp);
> + error = xfs_attr_set_iter(dac);
> break;
> case XFS_ATTR_OP_FLAGS_REMOVE:
> ASSERT(XFS_IFORK_Q(args->dp));
> @@ -424,7 +423,7 @@ xfs_attr_finish_item(
> */
> dac->da_args->trans = tp;
>
> - error = xfs_trans_attr_finish_update(dac, done_item, &dac->leaf_bp,
> + error = xfs_trans_attr_finish_update(dac, done_item,
> attr->xattri_op_flags);
> if (error != -EAGAIN)
> kmem_free(attr);
> @@ -640,7 +639,6 @@ xfs_attri_item_recover(
> xfs_trans_ijoin(tp, ip, 0);
>
> ret = xfs_trans_attr_finish_update(&attr->xattri_dac, done_item,
> - &attr->xattri_dac.leaf_bp,
> attrp->alfi_op_flags);
> if (ret == -EAGAIN) {
> /* There's more work to do, so add it to this transaction */
> --
> 2.7.4
>