[PATCH v2 1/4] erofs: remove unused device mapping in meta routine

From: Jingbo Xu
Date: Thu Feb 09 2023 - 00:18:53 EST


Currently metadata is always on bootstrap, and thus device mapping is
not needed so far. Remove the redundant device mapping in the meta
routine.

Signed-off-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Reviewed-by: Jia Zhu <zhujia.zj@xxxxxxxxxxxxx>
---
fs/erofs/fscache.c | 17 ++++-------------
1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 014e20962376..03de4dc99302 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -164,18 +164,8 @@ static int erofs_fscache_read_folios_async(struct fscache_cookie *cookie,
static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
{
int ret;
- struct super_block *sb = folio_mapping(folio)->host->i_sb;
+ struct erofs_fscache *ctx = folio_mapping(folio)->host->i_private;
struct erofs_fscache_request *req;
- struct erofs_map_dev mdev = {
- .m_deviceid = 0,
- .m_pa = folio_pos(folio),
- };
-
- ret = erofs_map_dev(sb, &mdev);
- if (ret) {
- folio_unlock(folio);
- return ret;
- }

req = erofs_fscache_req_alloc(folio_mapping(folio),
folio_pos(folio), folio_size(folio));
@@ -184,8 +174,8 @@ static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
return PTR_ERR(req);
}

- ret = erofs_fscache_read_folios_async(mdev.m_fscache->cookie,
- req, mdev.m_pa, folio_size(folio));
+ ret = erofs_fscache_read_folios_async(ctx->cookie, req,
+ folio_pos(folio), folio_size(folio));
if (ret)
req->error = ret;

@@ -469,6 +459,7 @@ struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
inode->i_size = OFFSET_MAX;
inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
+ inode->i_private = ctx;

ctx->inode = inode;
}
--
2.19.1.6.gb485710b