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From: Paulo Alcantara <pc@cjr.nz>
To: linux-cifs@vger.kernel.org, smfrench@gmail.com
Cc: Paulo Alcantara <pc@cjr.nz>
Subject: [PATCH 6/7] cifs: set a minimum of 2 minutes for refreshing dfs cache
Date: Fri,  4 Jun 2021 19:25:32 -0300	[thread overview]
Message-ID: <20210604222533.4760-7-pc@cjr.nz> (raw)
In-Reply-To: <20210604222533.4760-1-pc@cjr.nz>

We don't want to refresh the dfs cache in very short intervals, so
setting a minimum interval of 2 minutes is OK.

If it needs to be refreshed immediately, one could have the cache
cleared with

	$ echo 0 > /proc/fs/cifs/dfscache

and then remounting the dfs share.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
---
 fs/cifs/dfs_cache.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index f7c4874ddc17..b4df779e4248 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -24,6 +24,7 @@
 
 #define CACHE_HTABLE_SIZE 32
 #define CACHE_MAX_ENTRIES 64
+#define CACHE_MIN_TTL 120 /* 2 minutes */
 
 #define IS_INTERLINK_SET(v) ((v) & (DFSREF_REFERRAL_SERVER | \
 				    DFSREF_STORAGE_SERVER))
@@ -503,7 +504,7 @@ static int copy_ref_data(const struct dfs_info3_param *refs, int numrefs,
 {
 	int i;
 
-	ce->ttl = refs[0].ttl;
+	ce->ttl = max_t(int, refs[0].ttl, CACHE_MIN_TTL);
 	ce->etime = get_expire_time(ce->ttl);
 	ce->srvtype = refs[0].server_type;
 	ce->hdr_flags = refs[0].flags;
-- 
2.31.1


  parent reply	other threads:[~2021-06-04 22:26 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 22:25 [PATCH 0/7] dfs fixes Paulo Alcantara
2021-06-04 22:25 ` [PATCH 1/7] cifs: do not send tree disconnect to ipc shares Paulo Alcantara
2021-06-04 22:25 ` [PATCH 2/7] cifs: get rid of @noreq param in __dfs_cache_find() Paulo Alcantara
2021-06-04 22:25 ` [PATCH 3/7] cifs: keep referral server sessions alive Paulo Alcantara
2021-06-04 22:25 ` [PATCH 4/7] cifs: handle different charsets in dfs cache Paulo Alcantara
2021-06-04 22:25 ` [PATCH 5/7] cifs: fix path comparison and hash calc Paulo Alcantara
2021-06-05 21:04   ` Steve French
2021-06-04 22:25 ` Paulo Alcantara [this message]
2021-06-04 22:25 ` [PATCH 7/7] cifs: do not share tcp servers with dfs mounts Paulo Alcantara
2021-06-05 21:05 ` [PATCH 0/7] dfs fixes Steve French

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