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erofs: add sysfs node to drop internal caches

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Add a sysfs node to drop compression-related caches, currently used to
drop in-memory pclusters and cached compressed folios.

Signed-off-by: Chunhai Guo <guochunhai@vivo.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20241113041148.749129-1-guochunhai@vivo.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Chunhai Guo 2024-11-12 21:11:48 -07:00 committed by Gao Xiang
parent f5ad9f9a60
commit db80b98305
4 changed files with 30 additions and 1 deletions
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11
Documentation/ABI/testing/sysfs-fs-erofs
View File

@ -16,3 +16,14 @@ Description: Control strategy of sync decompression:
readahead on atomic contexts only.
- 1 (force on): enable for readpage and readahead.
- 2 (force off): disable for all situations.
What: /sys/fs/erofs/<disk>/drop_caches
Date: November 2024
Contact: "Guo Chunhai" <guochunhai@vivo.com>
Description: Writing to this will drop compression-related caches,
currently used to drop in-memory pclusters and cached
compressed folios:
- 1 : invalidate cached compressed folios
- 2 : drop in-memory pclusters
- 3 : drop in-memory pclusters and cached compressed folios

2
fs/erofs/internal.h
View File

@ -450,6 +450,8 @@ static inline void erofs_pagepool_add(struct page **pagepool, struct page *page)
void erofs_release_pages(struct page **pagepool);
#ifdef CONFIG_EROFS_FS_ZIP
#define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
extern atomic_long_t erofs_global_shrink_cnt;
void erofs_shrinker_register(struct super_block *sb);
void erofs_shrinker_unregister(struct super_block *sb);

17
fs/erofs/sysfs.c
View File

@ -10,6 +10,7 @@
enum {
attr_feature,
attr_drop_caches,
attr_pointer_ui,
attr_pointer_bool,
};
@ -57,11 +58,13 @@ static struct erofs_attr erofs_attr_##_name = { \
#ifdef CONFIG_EROFS_FS_ZIP
EROFS_ATTR_RW_UI(sync_decompress, erofs_mount_opts);
EROFS_ATTR_FUNC(drop_caches, 0200);
#endif
static struct attribute *erofs_attrs[] = {
#ifdef CONFIG_EROFS_FS_ZIP
ATTR_LIST(sync_decompress),
ATTR_LIST(drop_caches),
#endif
NULL,
};
@ -163,6 +166,20 @@ static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr,
return -EINVAL;
*(bool *)ptr = !!t;
return len;
#ifdef CONFIG_EROFS_FS_ZIP
case attr_drop_caches:
ret = kstrtoul(skip_spaces(buf), 0, &t);
if (ret)
return ret;
if (t < 1 || t > 3)
return -EINVAL;
if (t & 2)
z_erofs_shrink_scan(sbi, ~0UL);
if (t & 1)
invalidate_mapping_pages(MNGD_MAPPING(sbi), 0, -1);
return len;
#endif
}
return 0;
}

1
fs/erofs/zdata.c
View File

@ -119,7 +119,6 @@ static inline unsigned int z_erofs_pclusterpages(struct z_erofs_pcluster *pcl)
return PAGE_ALIGN(pcl->pclustersize) >> PAGE_SHIFT;
}
#define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
static bool erofs_folio_is_managed(struct erofs_sb_info *sbi, struct folio *fo)
{
return fo->mapping == MNGD_MAPPING(sbi);