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From 0f1d456fad4ba6a696eff8976b9fe8a0f251e1b5 Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Mon, 27 Jan 2020 19:01:47 +0100
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Subject: [PATCH 076/116] virtiofsd: passthrough_ll: control readdirplus
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20200127190227.40942-73-dgilbert@redhat.com>
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Patchwork-id: 93524
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O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 072/112] virtiofsd: passthrough_ll: control readdirplus
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Bugzilla: 1694164
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
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From: Miklos Szeredi <mszeredi@redhat.com>
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Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 59aef494be2d8d91055ff3f3a8eb13d9f32873d8)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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tools/virtiofsd/helper.c | 4 ++++
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tools/virtiofsd/passthrough_ll.c | 7 ++++++-
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2 files changed, 10 insertions(+), 1 deletion(-)
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diff --git a/tools/virtiofsd/helper.c b/tools/virtiofsd/helper.c
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index 6d50a46..14f5d70 100644
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--- a/tools/virtiofsd/helper.c
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+++ b/tools/virtiofsd/helper.c
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@@ -153,6 +153,10 @@ void fuse_cmdline_help(void)
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" allowed (default: 10)\n"
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" -o norace disable racy fallback\n"
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" default: false\n"
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+ " -o readdirplus|no_readdirplus\n"
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+ " enable/disable readirplus\n"
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+ " default: readdirplus except with "
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+ "cache=never\n"
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);
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}
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diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
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index 6480c51..8b1784f 100644
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--- a/tools/virtiofsd/passthrough_ll.c
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+++ b/tools/virtiofsd/passthrough_ll.c
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@@ -117,6 +117,8 @@ struct lo_data {
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double timeout;
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int cache;
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int timeout_set;
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+ int readdirplus_set;
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+ int readdirplus_clear;
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struct lo_inode root; /* protected by lo->mutex */
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struct lo_map ino_map; /* protected by lo->mutex */
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struct lo_map dirp_map; /* protected by lo->mutex */
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@@ -140,6 +142,8 @@ static const struct fuse_opt lo_opts[] = {
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{ "cache=auto", offsetof(struct lo_data, cache), CACHE_NORMAL },
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{ "cache=always", offsetof(struct lo_data, cache), CACHE_ALWAYS },
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{ "norace", offsetof(struct lo_data, norace), 1 },
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+ { "readdirplus", offsetof(struct lo_data, readdirplus_set), 1 },
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+ { "no_readdirplus", offsetof(struct lo_data, readdirplus_clear), 1 },
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FUSE_OPT_END
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};
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static bool use_syslog = false;
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@@ -478,7 +482,8 @@ static void lo_init(void *userdata, struct fuse_conn_info *conn)
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fuse_log(FUSE_LOG_DEBUG, "lo_init: activating flock locks\n");
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conn->want |= FUSE_CAP_FLOCK_LOCKS;
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}
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- if (lo->cache == CACHE_NEVER) {
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+ if ((lo->cache == CACHE_NEVER && !lo->readdirplus_set) ||
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+ lo->readdirplus_clear) {
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fuse_log(FUSE_LOG_DEBUG, "lo_init: disabling readdirplus\n");
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conn->want &= ~FUSE_CAP_READDIRPLUS;
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}
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--
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1.8.3.1
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