[PATCH 04/17] NFS: Fix nfs_coalesce_size() to work with folios
From: trondmy@kernel.org
Date: 2023-01-07 17:42:14
Subsystem:
filesystems (vfs and infrastructure), nfs, sunrpc, and lockd clients, the rest · Maintainers:
Alexander Viro, Christian Brauner, Trond Myklebust, Anna Schumaker, Linus Torvalds
From: Trond Myklebust <redacted> Use the helper folio_size() where appropriate. Signed-off-by: Trond Myklebust <redacted> --- fs/nfs/pagelist.c | 28 +++++++++++++++++++--------- include/linux/nfs_page.h | 15 +++++++++++++++ 2 files changed, 34 insertions(+), 9 deletions(-)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 33b8d636dd78..30722cbcf5f4 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c@@ -1084,6 +1084,24 @@ static bool nfs_match_lock_context(const struct nfs_lock_context *l1, return l1->lockowner == l2->lockowner; } +static bool nfs_page_is_contiguous(const struct nfs_page *prev, + const struct nfs_page *req) +{ + size_t prev_end = prev->wb_pgbase + prev->wb_bytes; + + if (req_offset(req) != req_offset(prev) + prev->wb_bytes) + return false; + if (req->wb_pgbase == 0) + return prev_end == nfs_page_max_length(prev); + if (req->wb_pgbase == prev_end) { + struct folio *folio = nfs_page_to_folio(req); + if (folio) + return folio == nfs_page_to_folio(prev); + return req->wb_page == prev->wb_page; + } + return false; +} + /** * nfs_coalesce_size - test two requests for compatibility * @prev: pointer to nfs_page
@@ -1112,16 +1130,8 @@ static unsigned int nfs_coalesce_size(struct nfs_page *prev, !nfs_match_lock_context(req->wb_lock_context, prev->wb_lock_context)) return 0; - if (req_offset(req) != req_offset(prev) + prev->wb_bytes) + if (!nfs_page_is_contiguous(prev, req)) return 0; - if (req->wb_page == prev->wb_page) { - if (req->wb_pgbase != prev->wb_pgbase + prev->wb_bytes) - return 0; - } else { - if (req->wb_pgbase != 0 || - prev->wb_pgbase + prev->wb_bytes != PAGE_SIZE) - return 0; - } } return pgio->pg_ops->pg_test(pgio, prev, req); }
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index d2ddc9a594c5..192071a6e5f6 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h@@ -189,6 +189,21 @@ static inline struct page *nfs_page_to_page(const struct nfs_page *req, return folio_page(folio, pgbase >> PAGE_SHIFT); } +/** + * nfs_page_max_length - Retrieve the maximum possible length for a request + * @req: pointer to a struct nfs_page + * + * Returns the maximum possible length of a request + */ +static inline size_t nfs_page_max_length(const struct nfs_page *req) +{ + struct folio *folio = nfs_page_to_folio(req); + + if (folio == NULL) + return PAGE_SIZE; + return folio_size(folio); +} + /* * Lock the page of an asynchronous request */
--
2.39.0