diff options
| author | Pranjal Shrivastava <praan@google.com> | 2026-08-14 14:32:51 +0000 |
|---|---|---|
| committer | Anna Schumaker <anna.schumaker@hammerspace.com> | 2026-10-05 09:46:39 -0400 |
| commit | d91ae903f4764da43f570b8228de7ab2f79591e1 (patch) | |
| tree | ceeab5ef803d0b9b9d46199002aa4c3e4c2dfb02 /include/linux | |
| parent | a90ee4305c4a5df72c11b31dacfdc76e00fcf78a (diff) | |
nfs: make nfs_page pin-aware
Modernizing the NFS Direct I/O path to use iov_iter_extract_pages()
introduces page pinning (GUP) instead of standard page referencing.
To handle this correctly, nfs_page must track whether it holds a
pin or a standard reference.
Introduce a new flag, PG_PINNED, to struct nfs_page. Update the creation
path (nfs_page_create_from_page and nfs_page_create_from_folio) to
accept a pinned bool and set the flag accordingly. If the page is pinned,
we skip the existing reference increment (get_page/folio_get) as the pin
itself acts as a reference.
Update nfs_clear_request() & nfs_direct_release_pages() to use
unpin_user_page() or unpin_user_folio() instead of only refcount
decrement (put_page) when PG_PINNED flag is set. Finally, ensure
subrequests inherit the pinning status from their parent request.
Signed-off-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <anna.schumaker@hammerspace.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/nfs_page.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h index 4b9a35dbc062..fd7aafe7cb54 100644 --- a/include/linux/nfs_page.h +++ b/include/linux/nfs_page.h @@ -38,6 +38,7 @@ enum { PG_REMOVE, /* page group sync bit in write path */ PG_CONTENDED1, /* Is someone waiting for a lock? */ PG_CONTENDED2, /* Is someone waiting for a lock? */ + PG_PINNED, /* page is pinned by GUP */ }; struct nfs_inode; @@ -125,11 +126,13 @@ struct nfs_pageio_descriptor { extern struct nfs_page *nfs_page_create_from_page(struct nfs_open_context *ctx, struct page *page, + bool pinned, unsigned int pgbase, loff_t offset, unsigned int count); extern struct nfs_page *nfs_page_create_from_folio(struct nfs_open_context *ctx, struct folio *folio, + bool pinned, unsigned int offset, unsigned int count); extern void nfs_release_request(struct nfs_page *); |