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Commit 2497ee41 authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman
Browse files

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: default avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0d40d6e3

drivers/staging/erofs/internal.h

+6 −0
Original line number Diff line number Diff line
@@ -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

drivers/staging/erofs/super.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

}

drivers/staging/erofs/utils.c

+17 −0
Original line number Diff line number Diff line
@@ -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);

}