linux-kernel - [PATCH v2 8/8] fs/9p: fix dups even in uncached mode

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Message-Id: <20240108-ericvh-fix-cache-dups-v2-8-a73f8822838c@kernel.org>
Date: Mon, 08 Jan 2024 15:18:24 +0000
From: Eric Van Hensbergen <ericvh@...nel.org>
To: Latchesar Ionkov <lucho@...kov.net>, 
 Dominique Martinet <asmadeus@...ewreck.org>, 
 Christian Schoenebeck <linux_oss@...debyte.com>
Cc: v9fs@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Eric Van Hensbergen <ericvh@...nel.org>
Subject: [PATCH v2 8/8] fs/9p: fix dups even in uncached mode

In uncached mode we were still seeing duplicate getattr requests
because of aggressive dropping of inodes.  Inode "freshness" is
guarded by other mechanisms when caches are disabled so this
is unnecessary and increases overhead of almost every operation.

Signed-off-by: Eric Van Hensbergen <ericvh@...nel.org>
---
 fs/9p/vfs_super.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 6d9a98c57185..a898dbf97710 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -244,21 +244,6 @@ static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	return res;
 }
 
-static int v9fs_drop_inode(struct inode *inode)
-{
-	struct v9fs_session_info *v9ses;
-
-	v9ses = v9fs_inode2v9ses(inode);
-	if (v9ses->cache & (CACHE_META|CACHE_LOOSE))
-		return generic_drop_inode(inode);
-	/*
-	 * in case of non cached mode always drop the
-	 * inode because we want the inode attribute
-	 * to always match that on the server.
-	 */
-	return 1;
-}
-
 static int v9fs_write_inode(struct inode *inode,
 			    struct writeback_control *wbc)
 {
@@ -303,7 +288,6 @@ static const struct super_operations v9fs_super_ops_dotl = {
 	.alloc_inode = v9fs_alloc_inode,
 	.free_inode = v9fs_free_inode,
 	.statfs = v9fs_statfs,
-	.drop_inode = v9fs_drop_inode,
 	.evict_inode = v9fs_evict_inode,
 	.show_options = v9fs_show_options,
 	.umount_begin = v9fs_umount_begin,

-- 
2.41.0