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staging: erofs: introduce superblock registration 

In order to introducing shrinker solution for erofs,
let's manage all mounted erofs instances at first.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2018-07-26 20:22:03 +08:00 committed by Greg Kroah-Hartman
parent 0d40d6e399
commit 2497ee4129
3 changed files with 27 additions and 0 deletions
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6
drivers/staging/erofs/internal.h
View File

@ -64,6 +64,9 @@ struct erofs_fault_info {
typedef u64 erofs_nid_t;
struct erofs_sb_info {
/* list for all registered superblocks, mainly for shrinker */
struct list_head list;
u32 blocks;
u32 meta_blkaddr;
#ifdef CONFIG_EROFS_FS_XATTR
@ -410,6 +413,9 @@ static inline void erofs_vunmap(const void *mem, unsigned int count)
/* utils.c */
extern struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp);
extern void erofs_register_super(struct super_block *sb);
extern void erofs_unregister_super(struct super_block *sb);
#ifndef lru_to_page
#define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
#endif

4
drivers/staging/erofs/super.c
View File

@ -326,6 +326,8 @@ static int erofs_read_super(struct super_block *sb,
snprintf(sbi->dev_name, PATH_MAX, "%s", dev_name);
sbi->dev_name[PATH_MAX - 1] = '\0';
erofs_register_super(sb);
/*
* We already have a positive dentry, which was instantiated
* by d_make_root. Just need to d_rehash it.
@ -373,6 +375,8 @@ static void erofs_put_super(struct super_block *sb)
infoln("unmounted for %s", sbi->dev_name);
__putname(sbi->dev_name);
erofs_unregister_super(sb);
kfree(sbi);
sb->s_fs_info = NULL;
}

17
drivers/staging/erofs/utils.c
View File

@ -29,3 +29,20 @@ struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp)
return page;
}
static DEFINE_MUTEX(erofs_sb_list_lock);
static LIST_HEAD(erofs_sb_list);
void erofs_register_super(struct super_block *sb)
{
mutex_lock(&erofs_sb_list_lock);
list_add(&EROFS_SB(sb)->list, &erofs_sb_list);
mutex_unlock(&erofs_sb_list_lock);
}
void erofs_unregister_super(struct super_block *sb)
{
mutex_lock(&erofs_sb_list_lock);
list_del(&EROFS_SB(sb)->list);
mutex_unlock(&erofs_sb_list_lock);
}