linux-kernel - [PATCH 08/13] afs: Note the amount transferred in fetch-data delivery

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Date:   Mon, 13 Jul 2020 17:38:32 +0100
From:   David Howells <dhowells@...hat.com>
To:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>
Cc:     Jeff Layton <jlayton@...hat.com>,
        Dave Wysochanski <dwysocha@...hat.com>, dhowells@...hat.com,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 08/13] afs: Note the amount transferred in fetch-data delivery

Note the amount of data transferred in the fscache request op structure in
the delivery/decode routines for the various FetchData operations.

Also, we need to exclude the excess from this value and then we need to use
this in directory read rather than actual_len.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/dir.c       |    9 ++++-----
 fs/afs/fsclient.c  |    5 +++++
 fs/afs/yfsclient.c |    5 +++++
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 9d47df15c790..03ef09330d10 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -209,9 +209,8 @@ static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req)
 	pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n",
 		dvnode->fid.vid, dvnode->fid.vnode,
 		req->file_size, req->cache.len, req->actual_len);
-	pr_warn("DIR %llx %x %zx %zx\n",
-		req->cache.pos, req->cache.nr_pages,
-		req->iter->iov_offset,  iov_iter_count(req->iter));
+	pr_warn("DIR %llx %x %llx\n",
+		req->cache.pos, req->cache.nr_pages, req->cache.transferred);
 
 	xas_for_each(&xas, page, last) {
 		if (xas_retry(&xas, page))
@@ -321,7 +320,7 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
 
 	nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
 
-	req->actual_len = i_size; /* May change */
+	req->cache.transferred = i_size; /* May change */
 	req->cache.len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
 	req->data_version = dvnode->status.data_version; /* May change */
 	iov_iter_mapping(&req->def_iter, READ, dvnode->vfs_inode.i_mapping,
@@ -546,7 +545,7 @@ static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
 
 	/* walk through the blocks in sequence */
 	ret = 0;
-	while (ctx->pos < req->actual_len) {
+	while (ctx->pos < req->cache.transferred) {
 		blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
 
 		/* Fetch the appropriate page from the directory and re-add it
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index d6a8066e666d..e729a19f28c5 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -393,6 +393,11 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
 		break;
 	}
 
+	/* Pass the call's ref on the read request descriptor to the completion
+	 * handler.
+	 */
+	req->cache.transferred = min(req->actual_len, req->cache.len);
+	set_bit(FSCACHE_IO_DATA_FROM_SERVER, &req->cache.flags);
 	if (req->cache.io_done)
 		req->cache.io_done(&req->cache);
 
diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c
index 30621f4fffc0..4ead0c1f9014 100644
--- a/fs/afs/yfsclient.c
+++ b/fs/afs/yfsclient.c
@@ -450,6 +450,11 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call)
 		break;
 	}
 
+	/* Pass the call's ref on the read request descriptor to the completion
+	 * handler.
+	 */
+	req->cache.transferred = min(req->actual_len, req->cache.len);
+	set_bit(FSCACHE_IO_DATA_FROM_SERVER, &req->cache.flags);
 	if (req->cache.io_done)
 		req->cache.io_done(&req->cache);