linux-kernel - [PATCH 19/19] afs: Maintain netfs_i_context::remote_i

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Date:   Wed, 02 Mar 2022 14:09:06 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.com
Cc:     linux-afs@...ts.infradead.org, dhowells@...hat.com,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jeff Layton <jlayton@...hat.com>,
        David Wysochanski <dwysocha@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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 19/19] afs: Maintain netfs_i_context::remote_i_size

Make afs use netfslib's tracking for the server's idea of what the current
inode size is independently of inode->i_size.  We really want to use this
value when calculating the new vnode size when initiating a StoreData RPC
op rather than the size stat() presents to the user (ie. inode->i_size) as
the latter is affected by as-yet uncommitted writes.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-cachefs@...hat.com
cc: linux-afs@...ts.infradead.org
---

 fs/afs/inode.c |    1 +
 fs/afs/write.c |    7 +++----
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 5b5e40197655..2fe402483ad5 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -246,6 +246,7 @@ static void afs_apply_status(struct afs_operation *op,
 		 * idea of what the size should be that's not the same as
 		 * what's on the server.
 		 */
+		vnode->netfs_ctx.remote_i_size = status->size;
 		if (change_size) {
 			afs_set_i_size(vnode, status->size);
 			inode->i_ctime = t;
diff --git a/fs/afs/write.c b/fs/afs/write.c
index e4b47f67a408..85c9056ba9fb 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -353,9 +353,10 @@ static const struct afs_operation_ops afs_store_data_operation = {
 static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t pos,
 			  bool laundering)
 {
+	struct netfs_i_context *ictx = &vnode->netfs_ctx;
 	struct afs_operation *op;
 	struct afs_wb_key *wbk = NULL;
-	loff_t size = iov_iter_count(iter), i_size;
+	loff_t size = iov_iter_count(iter);
 	int ret = -ENOKEY;
 
 	_enter("%s{%llx:%llu.%u},%llx,%llx",
@@ -377,15 +378,13 @@ static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t
 		return -ENOMEM;
 	}
 
-	i_size = i_size_read(&vnode->vfs_inode);
-
 	afs_op_set_vnode(op, 0, vnode);
 	op->file[0].dv_delta = 1;
 	op->file[0].modification = true;
 	op->store.write_iter = iter;
 	op->store.pos = pos;
 	op->store.size = size;
-	op->store.i_size = max(pos + size, i_size);
+	op->store.i_size = max(pos + size, ictx->remote_i_size);
 	op->store.laundering = laundering;
 	op->mtime = vnode->vfs_inode.i_mtime;
 	op->flags |= AFS_OPERATION_UNINTR;