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staging: erofs: redefine where `owned_workgrp_t' points 

By design, workgroups are queued in the form of linked lists.

Previously, it points to the next `z_erofs_vle_workgroup',
which isn't flexible enough to simplify `z_erofs_vle_submit_all'.

Let's fix it by pointing to the next `owned_workgrp_t' and use
container_of to get its coresponding `z_erofs_vle_workgroup'.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2018-12-08 00:19:17 +08:00 committed by Greg Kroah-Hartman
parent 92e6efd566
commit 6afd227ca1
2 changed files with 9 additions and 7 deletions
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12
drivers/staging/erofs/unzip_vle.c
View File

@ -333,7 +333,7 @@ retry:
*owned_head) != Z_EROFS_VLE_WORKGRP_NIL)
goto retry;
*owned_head = grp;
*owned_head = &grp->next;
*hosted = true;
} else if (grp->next == Z_EROFS_VLE_WORKGRP_TAIL) {
/*
@ -488,7 +488,8 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f,
}
}
*f->owned_head = *f->grp_ret = grp;
*f->owned_head = &grp->next;
*f->grp_ret = grp;
return work;
}
@ -1084,7 +1085,7 @@ static void z_erofs_vle_unzip_all(struct super_block *sb,
/* no possible that 'owned' equals NULL */
DBG_BUGON(owned == Z_EROFS_VLE_WORKGRP_NIL);
grp = owned;
grp = container_of(owned, struct z_erofs_vle_workgroup, next);
owned = READ_ONCE(grp->next);
z_erofs_vle_unzip(sb, grp, page_pool);
@ -1325,7 +1326,8 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_NIL);
grp = owned_head;
grp = container_of(owned_head,
struct z_erofs_vle_workgroup, next);
/* close the main owned chain at first */
owned_head = cmpxchg(&grp->next, Z_EROFS_VLE_WORKGRP_TAIL,
@ -1382,7 +1384,7 @@ skippage:
WRITE_ONCE(lstgrp_io->next, iogrp_next);
if (!lstgrp_noio)
ios[0]->head = grp;
ios[0]->head = &grp->next;
else
WRITE_ONCE(lstgrp_noio->next, grp);

4
drivers/staging/erofs/unzip_vle.h
View File

@ -67,13 +67,13 @@ struct z_erofs_vle_work {
#define Z_EROFS_VLE_WORKGRP_FMT_LZ4 1
#define Z_EROFS_VLE_WORKGRP_FMT_MASK 1
typedef struct z_erofs_vle_workgroup *z_erofs_vle_owned_workgrp_t;
typedef void *z_erofs_vle_owned_workgrp_t;
struct z_erofs_vle_workgroup {
struct erofs_workgroup obj;
struct z_erofs_vle_work work;
/* next owned workgroup */
/* point to next owned_workgrp_t */
z_erofs_vle_owned_workgrp_t next;
/* compressed pages (including multi-usage pages) */