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diff --git a/Documentation/filesystems/cifs/TODO b/Documentation/filesystems/cifs/TODO deleted file mode 100644 index edbbccda1942..000000000000 --- a/Documentation/filesystems/cifs/TODO +++ /dev/null @@ -1,125 +0,0 @@ -Version 2.14 December 21, 2018 - -A Partial List of Missing Features -================================== - -Contributions are welcome. There are plenty of opportunities -for visible, important contributions to this module. Here -is a partial list of the known problems and missing features: - -a) SMB3 (and SMB3.1.1) missing optional features: - - multichannel (started), integration with RDMA - - directory leases (improved metadata caching), started (root dir only) - - T10 copy offload ie "ODX" (copy chunk, and "Duplicate Extents" ioctl - currently the only two server side copy mechanisms supported) - -b) improved sparse file support (fiemap and SEEK_HOLE are implemented -but additional features would be supportable by the protocol). - -c) Directory entry caching relies on a 1 second timer, rather than -using Directory Leases, currently only the root file handle is cached longer - -d) quota support (needs minor kernel change since quota calls -to make it to network filesystems or deviceless filesystems) - -e) Additional use cases can be optimized to use "compounding" -(e.g. open/query/close and open/setinfo/close) to reduce the number -of roundtrips to the server and improve performance. Various cases -(stat, statfs, create, unlink, mkdir) already have been improved by -using compounding but more can be done. In addition we could significantly -reduce redundant opens by using deferred close (with handle caching leases) -and better using reference counters on file handles. - -f) Finish inotify support so kde and gnome file list windows -will autorefresh (partially complete by Asser). Needs minor kernel -vfs change to support removing D_NOTIFY on a file. - -g) Add GUI tool to configure /proc/fs/cifs settings and for display of -the CIFS statistics (started) - -h) implement support for security and trusted categories of xattrs -(requires minor protocol extension) to enable better support for SELINUX - -i) Add support for tree connect contexts (see MS-SMB2) a new SMB3.1.1 protocol - feature (may be especially useful for virtualization). - -j) Create UID mapping facility so server UIDs can be mapped on a per -mount or a per server basis to client UIDs or nobody if no mapping -exists. Also better integration with winbind for resolving SID owners - -k) Add tools to take advantage of more smb3 specific ioctls and features -(passthrough ioctl/fsctl is now implemented in cifs.ko to allow sending -various SMB3 fsctls and query info and set info calls directly from user space) -Add tools to make setting various non-POSIX metadata attributes easier -from tools (e.g. extending what was done in smb-info tool). - -l) encrypted file support - -m) improved stats gathering tools (perhaps integration with nfsometer?) -to extend and make easier to use what is currently in /proc/fs/cifs/Stats - -n) Add support for claims based ACLs ("DAC") - -o) mount helper GUI (to simplify the various configuration options on mount) - -p) Add support for witness protocol (perhaps ioctl to cifs.ko from user space - tool listening on witness protocol RPC) to allow for notification of share - move, server failover, and server adapter changes. And also improve other - failover scenarios, e.g. when client knows multiple DFS entries point to - different servers, and the server we are connected to has gone down. - -q) Allow mount.cifs to be more verbose in reporting errors with dialect -or unsupported feature errors. - -r) updating cifs documentation, and user guide. - -s) Addressing bugs found by running a broader set of xfstests in standard -file system xfstest suite. - -t) split cifs and smb3 support into separate modules so legacy (and less -secure) CIFS dialect can be disabled in environments that don't need it -and simplify the code. - -v) POSIX Extensions for SMB3.1.1 (started, create and mkdir support added -so far). - -w) Add support for additional strong encryption types, and additional spnego -authentication mechanisms (see MS-SMB2) - -x) Finish support for SMB3.1.1 compression - -KNOWN BUGS -==================================== -See http://bugzilla.samba.org - search on product "CifsVFS" for -current bug list. Also check http://bugzilla.kernel.org (Product = File System, Component = CIFS) - -1) existing symbolic links (Windows reparse points) are recognized but -can not be created remotely. They are implemented for Samba and those that -support the CIFS Unix extensions, although earlier versions of Samba -overly restrict the pathnames. -2) follow_link and readdir code does not follow dfs junctions -but recognizes them - -Misc testing to do -================== -1) check out max path names and max path name components against various server -types. Try nested symlinks (8 deep). Return max path name in stat -f information - -2) Improve xfstest's cifs/smb3 enablement and adapt xfstests where needed to test -cifs/smb3 better - -3) Additional performance testing and optimization using iozone and similar - -there are some easy changes that can be done to parallelize sequential writes, -and when signing is disabled to request larger read sizes (larger than -negotiated size) and send larger write sizes to modern servers. - -4) More exhaustively test against less common servers - -5) Continue to extend the smb3 "buildbot" which does automated xfstesting -against Windows, Samba and Azure currently - to add additional tests and -to allow the buildbot to execute the tests faster. The URL for the -buildbot is: http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com - -6) Address various coverity warnings (most are not bugs per-se, but -the more warnings are addressed, the easier it is to spot real -problems that static analyzers will point out in the future). |