This adds support in struct fuse_args_pages and fuse_copy_pages() for
using folios instead of pages for transferring data. Both folios and
pages must be supported right now in struct fuse_args_pages and
fuse_copy_pages() until all request types have been converted to use
folios. Once all have been converted, then
struct fuse_args_pages and fuse_copy_pages() will only support folios.
Right now in fuse, all folios are one page (large folios are not yet
supported). As such, copying folio->page is sufficient for copying
the entire folio in fuse_copy_pages().
No functional changes.
Signed-off-by: Joanne Koong <joannelkoong@xxxxxxxxx>
---
fs/fuse/dev.c | 36 ++++++++++++++++++++++++++++--------
fs/fuse/fuse_i.h | 22 +++++++++++++++++++---
2 files changed, 47 insertions(+), 11 deletions(-)
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 7e4c5be45aec..cd9c5e0eefca 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1028,17 +1028,37 @@ static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
struct fuse_req *req = cs->req;
struct fuse_args_pages *ap = container_of(req->args, typeof(*ap), args);
+ if (ap->uses_folios) {
+ for (i = 0; i < ap->num_folios && (nbytes || zeroing); i++) {
+ int err;
+ unsigned int offset = ap->folio_descs[i].offset;
+ unsigned int count = min(nbytes, ap->folio_descs[i].length);
+ struct page *orig, *pagep;
- for (i = 0; i < ap->num_pages && (nbytes || zeroing); i++) {
- int err;
- unsigned int offset = ap->descs[i].offset;
- unsigned int count = min(nbytes, ap->descs[i].length);
+ orig = pagep = &ap->folios[i]->page;
- err = fuse_copy_page(cs, &ap->pages[i], offset, count, zeroing);
- if (err)
- return err;
+ err = fuse_copy_page(cs, &pagep, offset, count, zeroing);
+ if (err)
+ return err;
+
+ nbytes -= count;
+
+ /* Check if the folio was replaced in the page cache */
+ if (pagep != orig)
+ ap->folios[i] = page_folio(pagep);
+ }
+ } else {
+ for (i = 0; i < ap->num_pages && (nbytes || zeroing); i++) {
+ int err;
+ unsigned int offset = ap->descs[i].offset;
+ unsigned int count = min(nbytes, ap->descs[i].length);
+
+ err = fuse_copy_page(cs, &ap->pages[i], offset, count, zeroing);
+ if (err)
+ return err;
- nbytes -= count;
+ nbytes -= count;
+ }
}
return 0;
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 7ff00bae4a84..dcc0ab4bea78 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -291,6 +291,12 @@ struct fuse_page_desc {
unsigned int offset;
};
+/** FUSE folio descriptor */
+struct fuse_folio_desc {
+ unsigned int length;
+ unsigned int offset;
+};
+
struct fuse_args {
uint64_t nodeid;
uint32_t opcode;
@@ -316,9 +322,19 @@ struct fuse_args {
struct fuse_args_pages {
struct fuse_args args;
- struct page **pages;
- struct fuse_page_desc *descs;
- unsigned int num_pages;
+ union {
+ struct {
+ struct page **pages;
+ struct fuse_page_desc *descs;
+ unsigned int num_pages;
+ };
+ struct {
+ struct folio **folios;
+ struct fuse_folio_desc *folio_descs;
+ unsigned int num_folios;
+ };
+ };
+ bool uses_folios;
};
struct fuse_release_args {
--
2.43.5
