linux-kernel - [PATCH v3 19/20] netfs: Keep track of the actual remote file size

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Date:   Thu, 10 Mar 2022 16:20:18 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.com
Cc:     Jeff Layton <jlayton@...nel.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 v3 19/20] netfs: Keep track of the actual remote file size

Provide a place in which to keep track of the actual remote file size in
the netfs context.  This is needed because inode->i_size will be updated as
we buffer writes in the pagecache, but the server file size won't get
updated until we flush them back.

Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
cc: linux-cachefs@...hat.com
Link: https://lore.kernel.org/r/164623013727.3564931.17659955636985232717.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678219305.1200972.6459431995188365134.stgit@warthog.procyon.org.uk/ # v2
---

 include/linux/netfs.h |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 8458b30172a5..c7bf1eaf51d5 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -126,6 +126,7 @@ struct netfs_i_context {
 #if IS_ENABLED(CONFIG_FSCACHE)
 	struct fscache_cookie	*cache;
 #endif
+	loff_t			remote_i_size;	/* Size of the remote file */
 };
 
 /*
@@ -324,6 +325,21 @@ static inline void netfs_i_context_init(struct inode *inode,
 
 	memset(ctx, 0, sizeof(*ctx));
 	ctx->ops = ops;
+	ctx->remote_i_size = i_size_read(inode);
+}
+
+/**
+ * netfs_resize_file - Note that a file got resized
+ * @inode: The inode being resized
+ * @new_i_size: The new file size
+ *
+ * Inform the netfs lib that a file got resized so that it can adjust its state.
+ */
+static inline void netfs_resize_file(struct inode *inode, loff_t new_i_size)
+{
+	struct netfs_i_context *ctx = netfs_i_context(inode);
+
+	ctx->remote_i_size = new_i_size;
 }
 
 /**