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| author | Paulo Alcantara <palcantara@suse.de> | 2018-11-14 21:01:21 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-12-28 19:05:58 +0300 |
| commit | 54be1f6c1c37498bba557049df646cc239fa37e3 (patch) | |
| tree | 71a4c9b969eb2a2ac3f5d650840f7dadb7ea8c8f /fs/cifs/Makefile | |
| parent | e7b602f43719fc6173ae86d2de8f6f07c6858ddd (diff) | |
| download | linux-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/Makefile | 2 |
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 |