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staging: erofs: tidy up utils.c 

Keep in line with erofs-outofstaging patchset:
 - Update comments in erofs_try_to_release_workgroup;
 - code style cleanup.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190731155752.210602-21-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2019-07-31 23:57:50 +08:00 committed by Greg Kroah-Hartman
parent 4279f3f988
commit 2bb90cc275
1 changed files with 13 additions and 14 deletions
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27
drivers/staging/erofs/utils.c
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@ -114,8 +114,7 @@ int erofs_register_workgroup(struct super_block *sb,
*/
__erofs_workgroup_get(grp);
err = radix_tree_insert(&sbi->workstn_tree,
grp->index, grp);
err = radix_tree_insert(&sbi->workstn_tree, grp->index, grp);
if (unlikely(err))
/*
* it's safe to decrease since the workgroup isn't visible
@ -156,18 +155,18 @@ static bool erofs_try_to_release_workgroup(struct erofs_sb_info *sbi,
bool cleanup)
{
/*
* for managed cache enabled, the refcount of workgroups
* themselves could be < 0 (freezed). So there is no guarantee
* that all refcount > 0 if managed cache is enabled.
* If managed cache is on, refcount of workgroups
* themselves could be < 0 (freezed). In other words,
* there is no guarantee that all refcounts > 0.
*/
if (!erofs_workgroup_try_to_freeze(grp, 1))
return false;
/*
* note that all cached pages should be unlinked
* before delete it from the radix tree.
* Otherwise some cached pages of an orphan old workgroup
* could be still linked after the new one is available.
* Note that all cached pages should be unattached
* before deleted from the radix tree. Otherwise some
* cached pages could be still attached to the orphan
* old workgroup when the new one is available in the tree.
*/
if (erofs_try_to_free_all_cached_pages(sbi, grp)) {
erofs_workgroup_unfreeze(grp, 1);
@ -175,7 +174,7 @@ static bool erofs_try_to_release_workgroup(struct erofs_sb_info *sbi,
}
/*
* it is impossible to fail after the workgroup is freezed,
* It's impossible to fail after the workgroup is freezed,
* however in order to avoid some race conditions, add a
* DBG_BUGON to observe this in advance.
*/
@ -183,8 +182,8 @@ static bool erofs_try_to_release_workgroup(struct erofs_sb_info *sbi,
grp->index)) != grp);
/*
* if managed cache is enable, the last refcount
* should indicate the related workstation.
* If managed cache is on, last refcount should indicate
* the related workstation.
*/
erofs_workgroup_unfreeze_final(grp);
return true;
@ -273,9 +272,9 @@ static unsigned long erofs_shrink_scan(struct shrinker *shrink,
unsigned long freed = 0;
spin_lock(&erofs_sb_list_lock);
do
do {
run_no = ++shrinker_run_no;
while (run_no == 0);
} while (run_no == 0);
/* Iterate over all mounted superblocks and try to shrink them */
p = erofs_sb_list.next;