path: root/fs/cifs/CHANGES

Version 1.61
------------
Fix append problem to Samba servers (files opened with O_APPEND could
have duplicated data). Fix oops in cifs_lookup. Workaround problem
mounting to OS/400 Netserve. Fix oops in cifs_get_tcp_session.
Disable use of server inode numbers when server only
partially supports them (e.g. for one server querying inode numbers on
FindFirst fails but QPathInfo queries works).

Version 1.60
-------------
Fix memory leak in reconnect.  Fix oops in DFS mount error path.
Set s_maxbytes to smaller (the max that vfs can handle) so that
sendfile will now work over cifs mounts again.  Add noforcegid
and noforceuid mount parameters. Fix small mem leak when using
ntlmv2. Fix 2nd mount to same server but with different port to
be allowed (rather than reusing the 1st port) - only when the
user explicitly overrides the port on the 2nd mount.

Version 1.59
------------
Client uses server inode numbers (which are persistent) rather than
client generated ones by default (mount option "serverino" turned
on by default if server supports it).  Add forceuid and forcegid
mount options (so that when negotiating unix extensions specifying
which uid mounted does not immediately force the server's reported
uids to be overridden).  Add support for scope mount parm. Improve
hard link detection to use same inode for both.  Do not set
read-only dos attribute on directories (for chmod) since Windows
explorer special cases this attribute bit for directories for
a different purpose.

Version 1.58
------------
Guard against buffer overruns in various UCS-2 to UTF-8 string conversions
when the UTF-8 string is composed of unusually long (more than 4 byte) converted
characters. Add support for mounting root of a share which redirects immediately
to DFS target. Convert string conversion functions from Unicode to more
accurately mark string length before allocating memory (which may help the
rare cases where a UTF-8 string is much larger than the UCS2 string that
we converted from).  Fix endianness of the vcnum field used during
session setup to distinguish multiple mounts to same server from different
userids. Raw NTLMSSP fixed (it requires /proc/fs/cifs/experimental
flag to be set to 2, and mount must enable krb5 to turn on extended security).
Performance of file create to Samba improved (posix create on lookup
removes 1 of 2 network requests sent on file create)
 
Version 1.57
------------
Improve support for multiple security contexts to the same server. We
used to use the same "vcnumber" for all connections which could cause
the server to treat subsequent connections, especially those that
are authenticated as guest, as reconnections, invalidating the earlier
user's smb session.  This fix allows cifs to mount multiple times to the
same server with different userids without risking invalidating earlier
established security contexts.  fsync now sends SMB Flush operation
to better ensure that we wait for server to write all of the data to
server disk (not just write it over the network).  Add new mount
parameter to allow user to disable sending the (slow) SMB flush on
fsync if desired (fsync still flushes all cached write data to the server).
Posix file open support added (turned off after one attempt if server
fails to support it properly, as with Samba server versions prior to 3.3.2)
Fix "redzone overwritten" bug in cifs_put_tcon (CIFSTcon may allocate too
little memory for the "nativeFileSystem" field returned by the server
during mount).  Endian convert inode numbers if necessary (makes it easier
to compare inode numbers on network files from big endian systems). 

Version 1.56
------------
Add "forcemandatorylock" mount option to allow user to use mandatory
rather than posix (advisory) byte range locks, even though server would
support posix byte range locks.  Fix query of root inode when prefixpath
specified and user does not have access to query information about the
top of the share.  Fix problem in 2.6.28 resolving DFS paths to
Samba servers (worked to Windows).  Fix rmdir so that pending search
(readdir) requests do not get invalid results which include the now
removed directory.  Fix oops in cifs_dfs_ref.c when prefixpath is not reachable
when using DFS.  Add better file create support to servers which support
the CIFS POSIX protocol extensions (this adds support for new flags
on create, and improves semantics for write of locked ranges).

Version 1.55
------------
Various fixes to make delete of open files behavior more predictable
(when delete of an open file fails we mark the file as "delete-on-close"
in a way that more servers accept, but only if we can first rename the
file to a temporary name).  Add experimental support for more safely
handling fcntl(F_SETLEASE).  Convert cifs to using blocking tcp
sends, and also let tcp autotune the socket send and receive buffers.
This reduces the number of EAGAIN errors returned by TCP/IP in
high stress workloads (and the number of retries on socket writes
when sending large SMBWriteX requests).  Fix case in which a portion of
data can in some cases not get written to the file on the server before the
file is closed.  Fix DFS parsing to properly handle path consumed field,
and to handle certain codepage conversions better.  Fix mount and
umount race that can cause oops in mount or umount or reconnect.

Version 1.54
------------
Fix premature write failure on congested networks (we would give up
on EAGAIN from the socket too quickly on large writes).
Cifs_mkdir and cifs_create now respect the setgid bit on parent dir.
Fix endian problems in acl (mode from/to cifs acl) on bigendian
architectures.  Fix problems with preserving timestamps on copying open
files (e.g. "cp -a") to Windows servers.  For mkdir and create honor setgid bit
on parent directory when server supports Unix Extensions but not POSIX
create. Update cifs.upcall version to handle new Kerberos sec flags
(this requires update of cifs.upcall program from Samba).  Fix memory leak
on dns_upcall (resolving DFS referralls).  Fix plain text password
authentication (requires setting SecurityFlags to 0x30030 to enable
lanman and plain text though).  Fix writes to be at correct offset when
file is open with O_APPEND and file is on a directio (forcediretio) mount.
Fix bug in rewinding readdir directory searches.  Add nodfs mount option.

Version 1.53
------------
DFS support added (Microsoft Distributed File System client support needed
for referrals which enable a hierarchical name space among servers).
Disable temporary caching of mode bits to servers which do not support
storing of mode (e.g. Windows servers, when client mounts without cifsacl
mount option) and add new "dynperm" mount option to enable temporary caching
of mode (enable old behavior).  Fix hang on mount caused when server crashes
tcp session during negotiate protocol.

Version 1.52
------------
Fix oops on second mount to server when null auth is used.
Enable experimental Kerberos support.  Return writebehind errors on flush
and sync so that events like out of disk space get reported properly on
cached files. Fix setxattr failure to certain Samba versions. Fix mount
of second share to disconnected server session (autoreconnect on this).
Add ability to modify cifs acls for handling chmod (when mounted with
cifsacl flag). Fix prefixpath path separator so we can handle mounts
with prefixpaths longer than one directory (one path component) when
mounted to Windows servers.  Fix slow file open when cifsacl
enabled. Fix memory leak in FindNext when the SMB call returns -EBADF.


Version 1.51
------------
Fix memory leak in statfs when mounted to very old servers (e.g.
Windows 9x).  Add new feature "POSIX open" which allows servers
which support the current POSIX Extensions to provide better semantics
(e.g. delete for open files opened with posix open).  Take into
account umask on posix mkdir not just older style mkdir.  Add
ability to mount to IPC$ share (which allows CIFS named pipes to be
opened, read and written as if they were files).  When 1st tree
connect fails (e.g. due to signing negotiation failure) fix
leak that causes cifsd not to stop and rmmod to fail to cleanup
cifs_request_buffers pool. Fix problem with POSIX Open/Mkdir on
bigendian architectures. Fix possible memory corruption when
EAGAIN returned on kern_recvmsg. Return better error if server
requires packet signing but client has disabled it. When mounted
with cifsacl mount option - mode bits are approximated based
on the contents of the ACL of the file or directory. When cifs
mount helper is missing convert make sure that UNC name 
has backslash (not forward slash) between ip address of server
and the share name.

Version 1.50
------------
Fix NTLMv2 signing. NFS server mounted over cifs works (if cifs mount is
done with "serverino" mount option).  Add support for POSIX Unlink
(helps with certain sharing violation cases when server such as
Samba supports newer POSIX CIFS Protocol Extensions). Add "nounix"
mount option to allow disabling the CIFS Unix Extensions for just
that mount. Fix hang on spinlock in find_writable_file (race when
reopening file after session crash).  Byte range unlock request to
windows server could unlock more bytes (on server copy of file)
than intended if start of unlock request is well before start of
a previous byte range lock that we issued.

Version 1.49
------------
IPv6 support.  Enable ipv6 addresses to be passed on mount (put the ipv6
address after the "ip=" mount option, at least until mount.cifs is fixed to
handle DNS host to ipv6 name translation).  Accept override of uid or gid
on mount even when Unix Extensions are negotiated (it used to be ignored
when Unix Extensions were ignored).  This allows users to override the
default uid and gid for files when they are certain that the uids or
gids on the server do not match those of the client.  Make "sec=none"
mount override username (so that null user connection is attempted)
to match what documentation said. Support for very large reads, over 127K,
available to some newer servers (such as Samba 3.0.26 and later but
note that it also requires setting CIFSMaxBufSize at module install
time to a larger value which may hurt performance in some cases).
Make sign option force signing (or fail if server does not support it).

Version 1.48
------------
Fix mtime bouncing around from local idea of last write times to remote time.
Fix hang (in i_size_read) when simultaneous size update of same remote file
on smp system corrupts sequence number. Do not reread unnecessarily partial page
(which we are about to overwrite anyway) when writing out file opened rw.
When DOS attribute of file on non-Unix server's file changes on the server side
from read-only back to read-write, reflect this change in default file mode
(we had been leaving a file's mode read-only until the inode were reloaded).
Allow setting of attribute back to ATTR_NORMAL (removing readonly dos attribute
when archive dos attribute not set and we are changing mode back to writeable
on server which does not support the Unix Extensions).  Remove read only dos
attribute on chmod when adding any write permission (ie on any of
user/group/other (not all of user/group/other ie  0222) when
mounted to windows.  Add support for POSIX MkDir (slight performance
enhancement and eliminates the network race between the mkdir and set 
path info of the mode).


Version 1.47
------------
Fix oops in list_del during mount caused by unaligned string.
Fix file corruption which could occur on some large file
copies caused by writepages page i/o completion bug.
Seek to SEEK_END forces check for update of file size for non-cached
files. Allow file size to be updated on remote extend of locally open,
non-cached file.  Fix reconnect to newer Samba servers (or other servers
which support the CIFS Unix/POSIX extensions) so that we again tell the
server the Unix/POSIX cifs capabilities which we support (SetFSInfo).
Add experimental support for new POSIX Open/Mkdir (which returns
stat information on the open, and allows setting the mode).

Version 1.46
------------
Support deep tree mounts.  Better support OS/2, Win9x (DOS) time stamps.
Allow null user to be specified on mount ("username="). Do not return
EINVAL on readdir when filldir fails due to overwritten blocksize
(fixes FC problem).  Return error in rename 2nd attempt retry (ie report
if rename by handle also fails, after rename by path fails, we were
not reporting whether the retry worked or not). Fix NTLMv2 to
work to Windows servers (mount with option "sec=ntlmv2").

Version 1.45
------------
Do not time out lockw calls when using posix extensions. Do not
time out requests if server still responding reasonably fast
on requests on other threads.  Improve POSIX locking emulation,
(lock cancel now works, and unlock of merged range works even
to Windows servers now).  Fix oops on mount to lanman servers
(win9x, os/2 etc.) when null password.  Do not send listxattr
(SMB to query all EAs) if nouser_xattr specified.  Fix SE Linux
problem (instantiate inodes/dentries in right order for readdir).

Version 1.44
------------
Rewritten sessionsetup support, including support for legacy SMB
session setup needed for OS/2 and older servers such as Windows 95 and 98.
Fix oops on ls to OS/2 servers.  Add support for level 1 FindFirst
so we can do search (ls etc.) to OS/2.  Do not send NTCreateX
or recent levels of FindFirst unless server says it supports NT SMBs
(instead use legacy equivalents from LANMAN dialect). Fix to allow
NTLMv2 authentication support (now can use stronger password hashing
on mount if corresponding /proc/fs/cifs/SecurityFlags is set (0x4004).
Allow override of global cifs security flags on mount via "sec=" option(s).

Version 1.43
------------
POSIX locking to servers which support CIFS POSIX Extensions
(disabled by default controlled by proc/fs/cifs/Experimental).
Handle conversion of long share names (especially Asian languages)
to Unicode during mount. Fix memory leak in sess struct on reconnect.
Fix rare oops after acpi suspend.  Fix O_TRUNC opens to overwrite on
cifs open which helps rare case when setpathinfo fails or server does
not support it. 

Version 1.42
------------
Fix slow oplock break when mounted to different servers at the same time and
the tids match and we try to find matching fid on wrong server. Fix read
looping when signing required by server (2.6.16 kernel only). Fix readdir
vs. rename race which could cause each to hang. Return . and .. even
if server does not.  Allow searches to skip first three entries and
begin at any location. Fix oops in find_writeable_file.

Version 1.41
------------
Fix NTLMv2 security (can be enabled in /proc/fs/cifs) so customers can
configure stronger authentication.  Fix sfu symlinks so they can
be followed (not just recognized).  Fix wraparound of bcc on
read responses when buffer size over 64K and also fix wrap of
max smb buffer size when CIFSMaxBufSize over 64K.  Fix oops in
cifs_user_read and cifs_readpages (when EAGAIN on send of smb
on socket is returned over and over).  Add POSIX (advisory) byte range
locking support (requires server with newest CIFS UNIX Extensions
to the protocol implemented). Slow down negprot slightly in port 139
RFC1001 case to give session_init time on buggy servers.

Version 1.40
------------
Use fsuid (fsgid) more consistently instead of uid (gid). Improve performance
of readpages by eliminating one extra memcpy. Allow update of file size
from remote server even if file is open for write as long as mount is
directio.  Recognize share mode security and send NTLM encrypted password
on tree connect if share mode negotiated.

Version 1.39
------------
Defer close of a file handle slightly if pending writes depend on that handle
(this reduces the EBADF bad file handle errors that can be logged under heavy
stress on writes). Modify cifs Kconfig options to expose CONFIG_CIFS_STATS2 
Fix SFU style symlinks and mknod needed for servers which do not support the
CIFS Unix Extensions.  Fix setfacl/getfacl on bigendian. Timeout negative
dentries so files that the client sees as deleted but that later get created
on the server will be recognized.  Add client side permission check on setattr.
Timeout stuck requests better (where server has never responded or sent corrupt
responses)

Version 1.38
------------
Fix tcp socket retransmission timeouts (e.g. on ENOSPACE from the socket)
to be smaller at first (but increasing) so large write performance performance
over GigE is better.  Do not hang thread on illegal byte range lock response
from Windows (Windows can send an RFC1001 size which does not match smb size) by
allowing an SMBs TCP length to be up to a few bytes longer than it should be.
wsize and rsize can now be larger than negotiated buffer size if server
supports large readx/writex, even when directio mount flag not specified.
Write size will in many cases now be 16K instead of 4K which greatly helps
file copy performance on lightly loaded networks.  Fix oops in dnotify
when experimental config flag enabled. Make cifsFYI more granular.

Version 1.37
------------
Fix readdir caching when unlink removes file in current search buffer,
and this is followed by a rewind search to just before the deleted entry.
Do not attempt to set ctime unless atime and/or mtime change requested
(most servers throw it away anyway). Fix length check of received smbs
to be more accurate. Fix big endian problem with mapchars mount option,
and with a field returned by statfs.

Version 1.36
------------
Add support for mounting to older pre-CIFS servers such as Windows9x and ME.
For these older servers, add option for passing netbios name of server in
on mount (servernetbiosname).  Add suspend support for power management, to
avoid cifsd thread preventing software suspend from working.
Add mount option for disabling the default behavior of sending byte range lock
requests to the server (necessary for certain applications which break with
mandatory lock behavior such as Evolution), and also mount option for
requesting case insensitive matching for path based requests (requesting
case sensitive is the default).

Version 1.35
------------
Add writepage performance improvements.  Fix path name conversions
for long filenames on mounts which were done with "mapchars" mount option
specified.  Ensure multiplex ids do not collide.  Fix case in which 
rmmod can oops if done soon after last unmount.  Fix truncated
search (readdir) output when resume filename was a long filename.
Fix filename conversion when mapchars mount option was specified and
filename was a long filename.

Version 1.34
------------
Fix error mapping of the TOO_MANY_LINKS (hardlinks) case.
Do not oops if root user kills cifs oplock kernel thread or
kills the cifsd thread (NB: killing the cifs kernel threads is not
recommended, unmount and rmmod cifs will kill them when they are
no longer needed).  Fix readdir to ASCII servers (ie older servers
which do not support Unicode) and also require asterisk.
Fix out of memory case in which data could be written one page
off in the page cache.

Version 1.33
------------
Fix caching problem, in which readdir of directory containing a file
which was cached could cause the file's time stamp to be updated
without invalidating the readahead data (so we could get stale
file data on the client for that file even as the server copy changed).
Cleanup response processing so cifsd can not loop when abnormally
terminated.


Version 1.32
------------
Fix oops in ls when Transact2 FindFirst (or FindNext) returns more than one
transact response for an SMB request and search entry split across two frames.
Add support for lsattr (getting ext2/ext3/reiserfs attr flags from the server)
as new protocol extensions. Do not send Get/Set calls for POSIX ACLs
unless server explicitly claims to support them in CIFS Unix extensions
POSIX ACL capability bit. Fix packet signing when multiuser mounting with
different users from the same client to the same server. Fix oops in
cifs_close. Add mount option for remapping reserved characters in
filenames (also allow recognizing files with created by SFU which have any
of these seven reserved characters, except backslash, to be recognized).
Fix invalid transact2 message (we were sometimes trying to interpret
oplock breaks as SMB responses). Add ioctl for checking that the
current uid matches the uid of the mounter (needed by umount.cifs).
Reduce the number of large buffer allocations in cifs response processing
(significantly reduces memory pressure under heavy stress with multiple
processes accessing the same server at the same time).

Version 1.31
------------
Fix updates of DOS attributes and time fields so that files on NT4 servers
do not get marked delete on close. Display sizes of cifs