[PATCH 4/8] staging: erofs: cleanup z_erofs_vle_work_{lookup, register}

From: Chao Yu
Date: Sun Aug 12 2018 - 10:02:47 EST

From: Gao Xiang <gaoxiang25@xxxxxxxxxx>

This patch introduces 'struct z_erofs_vle_work_finder' to clean up
arguments of z_erofs_vle_work_lookup and z_erofs_vle_work_register.

Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx>
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
drivers/staging/erofs/unzip_vle.c | 89 ++++++++++++++++---------------
1 file changed, 47 insertions(+), 42 deletions(-)

diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
index b2e05e2b4116..5032b3b05de1 100644
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -271,36 +271,42 @@ static inline bool try_to_claim_workgroup(
return true; /* lucky, I am the followee :) */
}

+struct z_erofs_vle_work_finder {
+ struct super_block *sb;
+ pgoff_t idx;
+ unsigned pageofs;
+
+ struct z_erofs_vle_workgroup **grp_ret;
+ enum z_erofs_vle_work_role *role;
+ z_erofs_vle_owned_workgrp_t *owned_head;
+ bool *hosted;
+};
+
static struct z_erofs_vle_work *
-z_erofs_vle_work_lookup(struct super_block *sb,
- pgoff_t idx, unsigned pageofs,
- struct z_erofs_vle_workgroup **grp_ret,
- enum z_erofs_vle_work_role *role,
- z_erofs_vle_owned_workgrp_t *owned_head,
- bool *hosted)
+z_erofs_vle_work_lookup(const struct z_erofs_vle_work_finder *f)
{
bool tag, primary;
struct erofs_workgroup *egrp;
struct z_erofs_vle_workgroup *grp;
struct z_erofs_vle_work *work;

- egrp = erofs_find_workgroup(sb, idx, &tag);
+ egrp = erofs_find_workgroup(f->sb, f->idx, &tag);
if (egrp == NULL) {
- *grp_ret = NULL;
+ *f->grp_ret = NULL;
return NULL;
}

- *grp_ret = grp = container_of(egrp,
- struct z_erofs_vle_workgroup, obj);
+ grp = container_of(egrp, struct z_erofs_vle_workgroup, obj);
+ *f->grp_ret = grp;

#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
- work = z_erofs_vle_grab_work(grp, pageofs);
+ work = z_erofs_vle_grab_work(grp, f->pageofs);
primary = true;
#else
BUG();
#endif

- DBG_BUGON(work->pageofs != pageofs);
+ DBG_BUGON(work->pageofs != f->pageofs);

/*
* lock must be taken first to avoid grp->next == NIL between
@@ -340,29 +346,24 @@ z_erofs_vle_work_lookup(struct super_block *sb,
*/
mutex_lock(&work->lock);

- *hosted = false;
+ *f->hosted = false;
if (!primary)
- *role = Z_EROFS_VLE_WORK_SECONDARY;
+ *f->role = Z_EROFS_VLE_WORK_SECONDARY;
/* claim the workgroup if possible */
- else if (try_to_claim_workgroup(grp, owned_head, hosted))
- *role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
+ else if (try_to_claim_workgroup(grp, f->owned_head, f->hosted))
+ *f->role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
else
- *role = Z_EROFS_VLE_WORK_PRIMARY;
+ *f->role = Z_EROFS_VLE_WORK_PRIMARY;

return work;
}

static struct z_erofs_vle_work *
-z_erofs_vle_work_register(struct super_block *sb,
- struct z_erofs_vle_workgroup **grp_ret,
- struct erofs_map_blocks *map,
- pgoff_t index, unsigned pageofs,
- enum z_erofs_vle_work_role *role,
- z_erofs_vle_owned_workgrp_t *owned_head,
- bool *hosted)
+z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f,
+ struct erofs_map_blocks *map)
{
- bool newgrp = false;
- struct z_erofs_vle_workgroup *grp = *grp_ret;
+ bool gnew = false;
+ struct z_erofs_vle_workgroup *grp = *f->grp_ret;
struct z_erofs_vle_work *work;

#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
@@ -376,7 +377,7 @@ z_erofs_vle_work_register(struct super_block *sb,
if (unlikely(grp == NULL))
return ERR_PTR(-ENOMEM);

- grp->obj.index = index;
+ grp->obj.index = f->idx;
grp->llen = map->m_llen;

z_erofs_vle_set_workgrp_fmt(grp,
@@ -386,13 +387,13 @@ z_erofs_vle_work_register(struct super_block *sb,
atomic_set(&grp->obj.refcount, 1);

/* new workgrps have been claimed as type 1 */
- WRITE_ONCE(grp->next, *owned_head);
+ WRITE_ONCE(grp->next, *f->owned_head);
/* primary and followed work for all new workgrps */
- *role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
+ *f->role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
/* it should be submitted by ourselves */
- *hosted = true;
+ *f->hosted = true;

- newgrp = true;
+ gnew = true;
#ifdef CONFIG_EROFS_FS_ZIP_MULTIREF
skip:
/* currently unimplemented */
@@ -400,12 +401,12 @@ z_erofs_vle_work_register(struct super_block *sb,
#else
work = z_erofs_vle_grab_primary_work(grp);
#endif
- work->pageofs = pageofs;
+ work->pageofs = f->pageofs;

mutex_init(&work->lock);

- if (newgrp) {
- int err = erofs_register_workgroup(sb, &grp->obj, 0);
+ if (gnew) {
+ int err = erofs_register_workgroup(f->sb, &grp->obj, 0);

if (err) {
kmem_cache_free(z_erofs_workgroup_cachep, grp);
@@ -413,7 +414,7 @@ z_erofs_vle_work_register(struct super_block *sb,
}
}

- *owned_head = *grp_ret = grp;
+ *f->owned_head = *f->grp_ret = grp;

mutex_lock(&work->lock);
return work;
@@ -440,9 +441,16 @@ static int z_erofs_vle_work_iter_begin(struct z_erofs_vle_work_builder *builder,
z_erofs_vle_owned_workgrp_t *owned_head)
{
const unsigned clusterpages = erofs_clusterpages(EROFS_SB(sb));
- const erofs_blk_t index = erofs_blknr(map->m_pa);
- const unsigned pageofs = map->m_la & ~PAGE_MASK;
struct z_erofs_vle_workgroup *grp;
+ const struct z_erofs_vle_work_finder finder = {
+ .sb = sb,
+ .idx = erofs_blknr(map->m_pa),
+ .pageofs = map->m_la & ~PAGE_MASK,
+ .grp_ret = &grp,
+ .role = &builder->role,
+ .owned_head = owned_head,
+ .hosted = &builder->hosted
+ };
struct z_erofs_vle_work *work;

DBG_BUGON(builder->work != NULL);
@@ -454,16 +462,13 @@ static int z_erofs_vle_work_iter_begin(struct z_erofs_vle_work_builder *builder,
DBG_BUGON(erofs_blkoff(map->m_pa));

repeat:
- work = z_erofs_vle_work_lookup(sb, index,
- pageofs, &grp, &builder->role, owned_head, &builder->hosted);
+ work = z_erofs_vle_work_lookup(&finder);
if (work != NULL) {
__update_workgrp_llen(grp, map->m_llen);
goto got_it;
}

- work = z_erofs_vle_work_register(sb, &grp, map, index, pageofs,
- &builder->role, owned_head, &builder->hosted);
-
+ work = z_erofs_vle_work_register(&finder, map);
if (unlikely(work == ERR_PTR(-EAGAIN)))
goto repeat;

--
2.18.0