Erofs over fscache depands on the config CONFIG_EROFS_FS_ONDEMAND in erofs. There is no way to check whether this feature is supported or not in userspace. We introduce sysfs file `erofs_ondemand` for user checking current features. Here is the example:
[Before] $ cat /sys/fs/erofs/features/erofs_ondemand cat: /sys/fs/erofs/features/erofs_ondemand: No such file or directory [After] $ cat /sys/fs/erofs/features/erofs_ondemand supported Signed-off-by: Hongbo Li <[email protected]> --- fs/erofs/sysfs.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/erofs/sysfs.c b/fs/erofs/sysfs.c index 435e515c0792..1b3d77583f76 100644 --- a/fs/erofs/sysfs.c +++ b/fs/erofs/sysfs.c @@ -78,6 +78,9 @@ EROFS_ATTR_FEATURE(sb_chksum); EROFS_ATTR_FEATURE(ztailpacking); EROFS_ATTR_FEATURE(fragments); EROFS_ATTR_FEATURE(dedupe); +#if IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) +EROFS_ATTR_FEATURE(erofs_ondemand); +#endif static struct attribute *erofs_feat_attrs[] = { ATTR_LIST(zero_padding), @@ -90,6 +93,9 @@ static struct attribute *erofs_feat_attrs[] = { ATTR_LIST(ztailpacking), ATTR_LIST(fragments), ATTR_LIST(dedupe), +#if IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) + ATTR_LIST(erofs_ondemand), +#endif NULL, }; ATTRIBUTE_GROUPS(erofs_feat); -- 2.34.1
