This patchset is a first stab at adding persistent, local caching facility for CIFS using the FS-Cache interface. The index hierarchy which is mainly used to locate a file object or discard a certain subset of the files cached, currently has three levels: - Server - Share - File The server index object is keyed by hostname of the server. The superblock index object is keyed by the sharename and the inode object is keyed by the UniqueId. The cache coherency is ensured by checking the 'LastWriteTime' and size of file. To use this, apply this patchset in order, mount the share with rsize=4096 and try copying a huge file (say few hundred MBs) from mount point to local filesystem. During the first time, the cache will be initialized. When you copy the second time, it should read from the local cache. To reduce the impact of page cache and see the local caching in action readily, try doing a sync and drop the caches by doing: sync; echo 3 > /proc/sys/vm/drop_caches Known issues ------------- - the cache coherency check may not be reliable always as some CIFS servers are known not to update mtime until the filehandle is closed. - not all the Servers under all circumstances provide a unique 'UniqueId'. Todo's ------- - improvements to avoid potential key collisions - address the above known issues This set is lightly tested and all the bugs seen during my testing have been fixed. However, this can be considered as an RFC for now. Any Comments or Suggestions are welcome. Suresh Jayaraman (10) cifs: add kernel config option for CIFS Client caching support cifs: guard cifsglob.h against multiple inclusion cifs: register CIFS for caching cifs: define server-level cache index objects and register them with FS-Cache cifs: define superblock-level cache index objects and register them cifs: define inode-level cache object and register them cifs: FS-Cache page management cifs: store pages into local cache cifs: read pages from FS-Cache cifs: add mount option to enable local caching Kconfig | 9 ++ Makefile | 2 cache.c | 251 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ cifs_fs_sb.h | 1 cifsfs.c | 15 +++ cifsglob.h | 14 +++ connect.c | 16 +++ file.c | 51 +++++++++++ fscache.c | 244 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ fscache.h | 135 +++++++++++++++++++++++++++++++ inode.c | 4 11 files changed, 742 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
