From 54be1f6c1c37498bba557049df646cc239fa37e3 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Wed, 14 Nov 2018 16:01:21 -0200 Subject: cifs: Add DFS cache routines * Add new dfs_cache.[ch] files * Add new /proc/fs/cifs/dfscache file - dump current cache when read - clear current cache when writing "0" to it * Add delayed_work to periodically refresh cache entries The new interface will be used for caching DFS referrals, as well as supporting client target failover. The DFS cache is a hashtable that maps UNC paths to cache entries. A cache entry contains: - the UNC path it is mapped on - how much the the UNC path the entry consumes - flags - a Time-To-Live after which the entry expires - a list of possible targets (linked lists of UNC paths) - a "hint target" pointing the last known working target or the first target if none were tried. This hint lets cifs.ko remember and try working targets first. * Looking for an entry in the cache is done with dfs_cache_find() - if no valid entries are found, a DFS query is made, stored in the cache and returned - the full target list can be copied and returned to avoid race conditions and looped on with the help with the dfs_cache_tgt_iterator * Updating the target hint to the next target is done with dfs_cache_update_tgthint() These functions have a dfs_cache_noreq_XXX() version that doesn't fetches referrals if no entries are found. These versions don't require the tcp/ses/tcon/cifs_sb parameters as a result. Expired entries cannot be used and since they have a pretty short TTL [1] in order for them to be useful for failover the DFS cache adds a delayed work called periodically to keep them fresh. Since we might not have available connections to issue the referral request when refreshing we need to store volume_info structs with credentials and other needed info to be able to connect to the right server. 1: Windows defaults: 5mn for domain-based referrals, 30mn for regular links Signed-off-by: Paulo Alcantara Signed-off-by: Aurelien Aptel Signed-off-by: Steve French --- fs/cifs/connect.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/cifs/connect.c') diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index d0de4fb8ee43..5feb3bf97d70 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2295,7 +2295,7 @@ static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol) return 1; } -static struct TCP_Server_Info * +struct TCP_Server_Info * cifs_find_tcp_session(struct smb_vol *vol) { struct TCP_Server_Info *server; -- cgit v1.2.3-55-g7522