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authorPaulo Alcantara <palcantara@suse.de>2018-11-14 21:01:21 +0300
committerSteve French <stfrench@microsoft.com>2018-12-28 19:05:58 +0300
commit54be1f6c1c37498bba557049df646cc239fa37e3 (patch)
tree71a4c9b969eb2a2ac3f5d650840f7dadb7ea8c8f /fs/cifs/Makefile
parente7b602f43719fc6173ae86d2de8f6f07c6858ddd (diff)
downloadlinux-54be1f6c1c37498bba557049df646cc239fa37e3.tar.xz
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 <palcantara@suse.de> Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/Makefile')
-rw-r--r--fs/cifs/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
index 85817991ee68..51af69a1a328 100644
--- a/fs/cifs/Makefile
+++ b/fs/cifs/Makefile
@@ -17,7 +17,7 @@ cifs-$(CONFIG_CIFS_ACL) += cifsacl.o
cifs-$(CONFIG_CIFS_UPCALL) += cifs_spnego.o
-cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o
+cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o dfs_cache.o
cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o