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@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com

Link: https://lore.kernel.org/r/164623013727.3564931.17659955636985232717.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/164678219305.1200972.6459431995188365134.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/164692921865.2099075.5310757978508056134.stgit@warthog.procyon.org.uk/

diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 8458b30172a56c80515d5d97a64c041d322acdf5..c7bf1eaf51d5aaa71c60a52006de277b94177a1f 100644 (file)
--- 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;
 }
 
 /**