| Message ID | 20240828072901.1017792-1-zhaoyang.huang@unisoc.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [RFC,1/1] fs: nfs: replace folio_set_private by folio_attach_private | expand |
loop more On Wed, Aug 28, 2024 at 3:29 PM zhaoyang.huang <zhaoyang.huang@unisoc.com> wrote: > > From: Zhaoyang Huang <zhaoyang.huang@unisoc.com> > > This patch is inspired by a code review of fs codes which aims at > folio's extra refcnt that could introduce unwanted behavious when > judging refcnt, such as[1]. The change relys on the policy as the > LRU page with private data should take one corresponding refcnt. > > [1] > long mapping_evict_folio(struct address_space *mapping, struct folio *folio) > { > ... > //current code will misjudge here if there is one pte on the folio which > is be deemed as the one as folio's private > if (folio_ref_count(folio) > > folio_nr_pages(folio) + folio_has_private(folio) + 1) > return 0; > if (!filemap_release_folio(folio, 0)) > return 0; > > return remove_mapping(mapping, folio); > } > > Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com> > --- > fs/nfs/write.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/fs/nfs/write.c b/fs/nfs/write.c > index d074d0ceb4f0..80c6ded5f74c 100644 > --- a/fs/nfs/write.c > +++ b/fs/nfs/write.c > @@ -772,8 +772,7 @@ static void nfs_inode_add_request(struct nfs_page *req) > nfs_lock_request(req); > spin_lock(&mapping->i_private_lock); > set_bit(PG_MAPPED, &req->wb_flags); > - folio_set_private(folio); > - folio->private = req; > + folio_attach_private(folio, req); > spin_unlock(&mapping->i_private_lock); > atomic_long_inc(&nfsi->nrequests); > /* this a head request for a page group - mark it as having an > @@ -797,8 +796,7 @@ static void nfs_inode_remove_request(struct nfs_page *req) > > spin_lock(&mapping->i_private_lock); > if (likely(folio)) { > - folio->private = NULL; > - folio_clear_private(folio); > + folio_detach_private(folio); > clear_bit(PG_MAPPED, &req->wb_head->wb_flags); > } > spin_unlock(&mapping->i_private_lock); > -- > 2.25.1 >
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index d074d0ceb4f0..80c6ded5f74c 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -772,8 +772,7 @@ static void nfs_inode_add_request(struct nfs_page *req) nfs_lock_request(req); spin_lock(&mapping->i_private_lock); set_bit(PG_MAPPED, &req->wb_flags); - folio_set_private(folio); - folio->private = req; + folio_attach_private(folio, req); spin_unlock(&mapping->i_private_lock); atomic_long_inc(&nfsi->nrequests); /* this a head request for a page group - mark it as having an @@ -797,8 +796,7 @@ static void nfs_inode_remove_request(struct nfs_page *req) spin_lock(&mapping->i_private_lock); if (likely(folio)) { - folio->private = NULL; - folio_clear_private(folio); + folio_detach_private(folio); clear_bit(PG_MAPPED, &req->wb_head->wb_flags); } spin_unlock(&mapping->i_private_lock);