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| author |   Gao Xiang <gaoxiang25@huawei.com> | 2018-07-26 20:22:03 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-27 17:24:09 +0200 |
| commit | 2497ee41295c769dc74cb8bac7e03842bc51d331 (patch) | |
| tree | 680ddbe6352f42c885f4b82560737049de9be88a /drivers/staging/erofs | |
| parent | staging: erofs: add a generic z_erofs VLE decompressor (diff) | |
| download | linux-dev-2497ee41295c769dc74cb8bac7e03842bc51d331.tar.xz linux-dev-2497ee41295c769dc74cb8bac7e03842bc51d331.zip | |
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>
Diffstat (limited to 'drivers/staging/erofs')
| -rw-r--r-- | drivers/staging/erofs/internal.h | 6 | ||||
| -rw-r--r-- | drivers/staging/erofs/super.c | 4 | ||||
| -rw-r--r-- | drivers/staging/erofs/utils.c | 17 |
3 files changed, 27 insertions, 0 deletions
diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h index e61d417bbeb3..18e7b9c2aaa0 100644 --- a/drivers/staging/erofs/internal.h +++ b/drivers/staging/erofs/internal.h @@ -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 diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c index 054375d6ecce..f455d7135599 100644 --- a/drivers/staging/erofs/super.c +++ b/drivers/staging/erofs/super.c @@ -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; } diff --git a/drivers/staging/erofs/utils.c b/drivers/staging/erofs/utils.c index 3dec4f80ed99..6748def67e74 100644 --- a/drivers/staging/erofs/utils.c +++ b/drivers/staging/erofs/utils.c @@ -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); +} + |