回复: [WIP] [PATCH 04/12] erofs-utils: fuse: adjust larger extent handling

[Huang Jianan]

Hi, Gao Xiang,
Sorry for the format of the previous email.

>so more easy to understand.
>
>[ let's fold in to the original patch. ]
>Cc: Huang Jianan <huangjianan at oppo.com>
>Signed-off-by: Gao Xiang <hsiangkao at aol.com>
>---
> fuse/read.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
>diff --git a/fuse/read.c b/fuse/read.c
>index 0d0e3b0fa468..dd44adaa1c40 100644
>--- a/fuse/read.c
>+++ b/fuse/read.c
>@@ -112,12 +112,17 @@ size_t erofs_read_data_compression(struct erofs_vnode *vnode, char *buffer,
> Z_EROFS_COMPRESSION_LZ4 :
> Z_EROFS_COMPRESSION_SHIFTED;
>
>-      if (end >= map.m_la + map.m_llen) {
>-      count = map.m_llen;
>-      partial = !(map.m_flags & EROFS_MAP_FULL_MAPPED);
>-      } else {
>+      /*
>+      * trim to the needed size if the returned extent is quite
>+      * larger than requested, and set up partial flag as well.
>+      */
>+      if (end < map.m_la + map.m_llen) {
> count = end - map.m_la;
> partial = true;
>+      } else {
>+      ASSERT(end == map.m_la + map_m_llen);

I think you mean map.m_llen intesad of map_m_llen.
Besides, I don't understand why add ASSERT here.
I think this condition will be true if offset+size is exactly the end of a compressed block?

>+      count = map.m_llen;
>+      partial = !(map.m_flags & EROFS_MAP_FULL_MAPPED);
> }
>
> if ((off_t)map.m_la < offset) {
>--
>2.24.0
>

Thanks,
Jianan
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