Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6

Igor Mammedov (DFS support)

Jeff Layton (many, many fixes, as well as great work on the cifs Kerberos code)

Scott Lovenberg

Pavel Shilovsky (for great work adding SMB2 support, and various SMB3 features)

Test case and Bug Report contributors

-------------------------------------

Version 1.53 May 20, 2008

Version 2.03 August 1, 2014

A Partial List of Missing Features

==================================

for visible, important contributions to this module.  Here

is a partial list of the known problems and missing features:

a) Support for SecurityDescriptors(Windows/CIFS ACLs) for chmod/chgrp/chown

so that these operations can be supported to Windows servers

a) SMB3 (and SMB3.02) missing optional features:

   - RDMA

   - multichannel (started)

   - directory leases (improved metadata caching)

   - T10 copy offload (copy chunk is only mechanism supported)

   - encrypted shares

b) Mapping POSIX ACLs (and eventually NFSv4 ACLs) to CIFS

SecurityDescriptors

b) improved sparse file support

c) Better pam/winbind integration (e.g. to handle uid mapping

better)

d) Cleanup now unneeded SessSetup code in

fs/cifs/connect.c and add back in NTLMSSP code if any servers

need it

e) fix NTLMv2 signing when two mounts with different users to same

server.

f) Directory entry caching relies on a 1 second timer, rather than 

c) Directory entry caching relies on a 1 second timer, rather than

using FindNotify or equivalent.  - (started)

g) quota support (needs minor kernel change since quota calls

d) quota support (needs minor kernel change since quota calls

to make it to network filesystems or deviceless filesystems)

h) investigate sync behavior (including syncpage) and check  

for proper behavior of intr/nointr

i) improve support for very old servers (OS/2 and Win9x for example)

e) improve support for very old servers (OS/2 and Win9x for example)

Including support for changing the time remotely (utimes command).

j) hook lower into the sockets api (as NFS/SunRPC does) to avoid the

f) hook lower into the sockets api (as NFS/SunRPC does) to avoid the

extra copy in/out of the socket buffers in some cases.

k) Better optimize open (and pathbased setfilesize) to reduce the

g) Better optimize open (and pathbased setfilesize) to reduce the

oplock breaks coming from windows srv.  Piggyback identical file

opens on top of each other by incrementing reference count rather

than resending (helps reduce server resource utilization and avoid

spurious oplock breaks).

l) Improve performance of readpages by sending more than one read

at a time when 8 pages or more are requested. In conjuntion

add support for async_cifs_readpages.

m) Add support for storing symlink info to Windows servers 

h) Add support for storing symlink info to Windows servers

in the Extended Attribute format their SFU clients would recognize.

n) Finish fcntl D_NOTIFY support so kde and gnome file list windows

i) 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.   

o) Add GUI tool to configure /proc/fs/cifs settings and for display of

j) Add GUI tool to configure /proc/fs/cifs settings and for display of

the CIFS statistics (started)

p) implement support for security and trusted categories of xattrs

k) implement support for security and trusted categories of xattrs

(requires minor protocol extension) to enable better support for SELINUX

q) Implement O_DIRECT flag on open (already supported on mount)

l) Implement O_DIRECT flag on open (already supported on mount)

r) Create UID mapping facility so server UIDs can be mapped on a per

m) 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.  This is helpful when Unix extensions are negotiated to

allow better permission checking when UIDs differ on the server

standard for asking the server for the corresponding name of a

particular uid.

s) Add support for CIFS Unix and also the newer POSIX extensions to the

server side for Samba 4.

n) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too)

o) mount check for unmatched uids

t) In support for OS/2 (LANMAN 1.2 and LANMAN2.1 based SMB servers) 

need to add ability to set time to server (utimes command)

p) Add support for new vfs entry point for fallocate

u) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too)

q) Add tools to take advantage of cifs/smb3 specific ioctls and features

such as "CopyChunk" (fast server side file copy)

v) mount check for unmatched uids

r) encrypted file support

w) Add support for new vfs entry point for fallocate

s) improved stats gathering, tools (perhaps integration with nfsometer?)

x) Fix Samba 3 server to handle Linux kernel aio so dbench with lots of 

processes can proceed better in parallel (on the server)

t) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed

file attribute via chflags)

y) Fix Samba 3 to handle reads/writes over 127K (and remove the cifs mount

restriction of wsize max being 127K) 

u) mount helper GUI (to simplify the various configuration options on mount)

KNOWN BUGS (updated April 24, 2007)

KNOWN BUGS

====================================

See http://bugzilla.samba.org - search on product "CifsVFS" for

current bug list.

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

overly restrict the pathnames.

2) follow_link and readdir code does not follow dfs junctions

but recognizes them

3) create of new files to FAT partitions on Windows servers can

succeed but still return access denied (appears to be Windows 

server not cifs client problem) and has not been reproduced recently.

NTFS partitions do not have this problem.

4) Unix/POSIX capabilities are reset after reconnection, and affect

a few fields in the tree connection but we do do not know which

superblocks to apply these changes to.  We should probably walk

the list of superblocks to set these.  Also need to check the

flags on the second mount to the same share, and see if we

can do the same trick that NFS does to remount duplicate shares.

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) Modify file portion of ltp so it can run against a mounted network

share and run it against cifs vfs in automated fashion.

2) Improve xfstest's cifs enablement and adapt xfstests where needed to test

cifs 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.  More testing

against Windows 9x, Windows ME servers.

4) More exhaustively test against less common servers

						   tcon->nativeFileSystem);

				}

				seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"

					"\n\tPathComponentMax: %d Status: 0x%d",

					"\n\tPathComponentMax: %d Status: %d",

					le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),

					le32_to_cpu(tcon->fsAttrInfo.Attributes),

					le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),

extern const struct export_operations cifs_export_ops;

#endif /* CONFIG_CIFS_NFSD_EXPORT */

#define CIFS_VERSION   "2.03"

#define CIFS_VERSION   "2.04"

#endif				/* _CIFSFS_H */

			const struct cifs_fid *, u32 *);

	int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,

			int);

	/* writepages retry size */

	unsigned int (*wp_retry_size)(struct inode *);

	/* get mtu credits */

	int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,

				unsigned int *, unsigned int *);

};

struct smb_version_values {

	server->ops->add_credits(server, add, optype);

}

static inline void

add_credits_and_wake_if(struct TCP_Server_Info *server, const unsigned int add,

			const int optype)

{

	if (add) {

		server->ops->add_credits(server, add, optype);

		wake_up(&server->request_q);

	}

}

static inline void

set_credits(struct TCP_Server_Info *server, const int val)

{

	struct address_space		*mapping;

	__u64				offset;

	unsigned int			bytes;

	unsigned int			got_bytes;

	pid_t				pid;

	int				result;

	struct work_struct		work;

	struct kvec			iov;

	unsigned int			pagesz;

	unsigned int			tailsz;

	unsigned int			credits;

	unsigned int			nr_pages;

	struct page			*pages[];

};

	int				result;

	unsigned int			pagesz;

	unsigned int			tailsz;

	unsigned int			credits;

	unsigned int			nr_pages;

	struct page			*pages[];

};

#define   CIFS_OBREAK_OP   0x0100    /* oplock break request */

#define   CIFS_NEG_OP      0x0200    /* negotiate request */

#define   CIFS_OP_MASK     0x0380    /* mask request type */

#define   CIFS_HAS_CREDITS 0x0400    /* already has credits */

/* Security Flags: indicate type of session setup needed */

#define   CIFSSEC_MAY_SIGN	0x00001