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erofs: fix up inplace decompression success rate 

Partial decompression should be checked after updating length.
It's a new regression when introducing multi-reference pclusters.

Fixes: 2bfab9c0ed ("erofs: record the longest decompressed size in this round")
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20221014064915.8103-1-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang 2022-10-14 14:49:15 +08:00
parent 63bbb85658
commit e7933278b4
1 changed files with 4 additions and 5 deletions
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9
fs/erofs/zdata.c
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@ -813,15 +813,14 @@ retry:
++spiltted;
if (fe->pcl->pageofs_out != (map->m_la & ~PAGE_MASK))
fe->pcl->multibases = true;
if ((map->m_flags & EROFS_MAP_FULL_MAPPED) &&
!(map->m_flags & EROFS_MAP_PARTIAL_REF) &&
fe->pcl->length == map->m_llen)
fe->pcl->partial = false;
if (fe->pcl->length < offset + end - map->m_la) {
fe->pcl->length = offset + end - map->m_la;
fe->pcl->pageofs_out = map->m_la & ~PAGE_MASK;
}
if ((map->m_flags & EROFS_MAP_FULL_MAPPED) &&
!(map->m_flags & EROFS_MAP_PARTIAL_REF) &&
fe->pcl->length == map->m_llen)
fe->pcl->partial = false;
next_part:
/* shorten the remaining extent to update progress */
map->m_llen = offset + cur - map->m_la;