linux-kernel - [PATCH v6 04/30] fs: Document file_ra

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Date:   Thu, 08 Apr 2021 15:04:46 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        dhowells@...hat.com,
        Trond Myklebust <trond.myklebust@...merspace.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>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        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-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v6 04/30] fs: Document file_ra_state

From: Matthew Wilcox (Oracle) <willy@...radead.org>

Turn the comments into kernel-doc and improve the wording slightly.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Signed-off-by: David Howells <dhowells@...hat.com>
Link: https://lore.kernel.org/r/20210407201857.3582797-3-willy@infradead.org/
---

 include/linux/fs.h |   24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index ec8f3ddf4a6a..33831a8bda52 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -891,18 +891,22 @@ struct fown_struct {
 	int signum;		/* posix.1b rt signal to be delivered on IO */
 };
 
-/*
- * Track a single file's readahead state
+/**
+ * struct file_ra_state - Track a file's readahead state.
+ * @start: Where the most recent readahead started.
+ * @size: Number of pages read in the most recent readahead.
+ * @async_size: Start next readahead when this many pages are left.
+ * @ra_pages: Maximum size of a readahead request.
+ * @mmap_miss: How many mmap accesses missed in the page cache.
+ * @prev_pos: The last byte in the most recent read request.
  */
 struct file_ra_state {
-	pgoff_t start;			/* where readahead started */
-	unsigned int size;		/* # of readahead pages */
-	unsigned int async_size;	/* do asynchronous readahead when
-					   there are only # of pages ahead */
-
-	unsigned int ra_pages;		/* Maximum readahead window */
-	unsigned int mmap_miss;		/* Cache miss stat for mmap accesses */
-	loff_t prev_pos;		/* Cache last read() position */
+	pgoff_t start;
+	unsigned int size;
+	unsigned int async_size;
+	unsigned int ra_pages;
+	unsigned int mmap_miss;
+	loff_t prev_pos;
 };
 
 /*