Add sysfs node to control cached decompression strategy, and all the
cache will be cleaned up when the strategy is set to
EROFS_ZIP_CACHE_DISABLED.
Signed-off-by: Chunhai Guo <guochun...@vivo.com>
---
Documentation/ABI/testing/sysfs-fs-erofs | 14 ++++++++++++++
fs/erofs/sysfs.c | 8 ++++++++
2 files changed, 22 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-fs-erofs
b/Documentation/ABI/testing/sysfs-fs-erofs
index 284224d1b56f..194087bcbaea 100644
--- a/Documentation/ABI/testing/sysfs-fs-erofs
+++ b/Documentation/ABI/testing/sysfs-fs-erofs
@@ -16,3 +16,17 @@ 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>/cache_strategy
+Date: November 2024
+Contact: "Guo Chunhai" <guochun...@vivo.com>
+Description: Control strategy of cached decompression strategy
+
+ - 0 (disabled): In-place I/O decompression only.
+ - 1 (readahead): Cache the last incomplete compressed physical
+ cluster for further reading. It still does in-place I/O
+ decompression for the rest compressed physical clusters.
+ - 2 (default, readaround): Cache the both ends of incomplete
+ compressed physical clusters for further reading. It
+ still does in-place I/O decompression for the rest
+ compressed physical clusters.
diff --git a/fs/erofs/sysfs.c b/fs/erofs/sysfs.c
index 63cffd0fd261..2ee59eef3aa7 100644
--- a/fs/erofs/sysfs.c
+++ b/fs/erofs/sysfs.c
@@ -57,11 +57,13 @@ static struct erofs_attr erofs_attr_##_name = {
\
#ifdef CONFIG_EROFS_FS_ZIP
EROFS_ATTR_RW_UI(sync_decompress, erofs_mount_opts);
+EROFS_ATTR_RW_UI(cache_strategy, erofs_mount_opts);
#endif
static struct attribute *erofs_attrs[] = {
#ifdef CONFIG_EROFS_FS_ZIP
ATTR_LIST(sync_decompress),
+ ATTR_LIST(cache_strategy),
#endif
NULL,
};
@@ -150,6 +152,12 @@ static ssize_t erofs_attr_store(struct kobject *kobj,
struct attribute *attr,
if (!strcmp(a->attr.name, "sync_decompress") &&
(t > EROFS_SYNC_DECOMPRESS_FORCE_OFF))
return -EINVAL;
+ else if (!strcmp(a->attr.name, "cache_strategy")) {
+ if (t > EROFS_ZIP_CACHE_READAROUND)
+ return -EINVAL;
+ else if (t == EROFS_ZIP_CACHE_DISABLED)
+ z_erofs_shrink_scan(sbi, ~0UL);
+ }
#endif
*(unsigned int *)ptr = t;
return len;
--
2.25.1
