erofs: add on-disk compressed tail-packing inline support
Introduces erofs compressed tail-packing inline support.
This approach adds a new field called `h_idata_size' in the
per-file compression header to indicate the encoded size of
each tail-packing pcluster.
At runtime, it will find the start logical offset of the tail
pcluster when initializing per-inode zmap and record such
extent (headlcn, idataoff) information to the in-memory inode.
Therefore, follow-on requests can directly recognize if one
pcluster is a tail-packing inline pcluster or not.
Link: https://lore.kernel.org/r/20211228054604.114518-6-hsiangkao@linux.alibaba.com
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
diff --git a/fs/erofs/sysfs.c b/fs/erofs/sysfs.c
index 6666934..dac252b 100644
--- a/fs/erofs/sysfs.c
+++ b/fs/erofs/sysfs.c
@@ -75,6 +75,7 @@ EROFS_ATTR_FEATURE(chunked_file);
EROFS_ATTR_FEATURE(device_table);
EROFS_ATTR_FEATURE(compr_head2);
EROFS_ATTR_FEATURE(sb_chksum);
+EROFS_ATTR_FEATURE(ztailpacking);
static struct attribute *erofs_feat_attrs[] = {
ATTR_LIST(zero_padding),
@@ -84,6 +85,7 @@ static struct attribute *erofs_feat_attrs[] = {
ATTR_LIST(device_table),
ATTR_LIST(compr_head2),
ATTR_LIST(sb_chksum),
+ ATTR_LIST(ztailpacking),
NULL,
};
ATTRIBUTE_GROUPS(erofs_feat);