Merge tag 'afs-next-20171113' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull AFS updates from David Howells:
 "kAFS filesystem driver overhaul.

  The major points of the overhaul are:

   (1) Preliminary groundwork is laid for supporting network-namespacing
       of kAFS. The remainder of the namespacing work requires some way
       to pass namespace information to submounts triggered by an
       automount. This requires something like the mount overhaul that's
       in progress.

   (2) sockaddr_rxrpc is used in preference to in_addr for holding
       addresses internally and add support for talking to the YFS VL
       server. With this, kAFS can do everything over IPv6 as well as
       IPv4 if it's talking to servers that support it.

   (3) Callback handling is overhauled to be generally passive rather
       than active. 'Callbacks' are promises by the server to tell us
       about data and metadata changes. Callbacks are now checked when
       we next touch an inode rather than actively going and looking for
       it where possible.

   (4) File access permit caching is overhauled to store the caching
       information per-inode rather than per-directory, shared over
       subordinate files. Whilst older AFS servers only allow ACLs on
       directories (shared to the files in that directory), newer AFS
       servers break that restriction.

       To improve memory usage and to make it easier to do mass-key
       removal, permit combinations are cached and shared.

   (5) Cell database management is overhauled to allow lighter locks to
       be used and to make cell records autonomous state machines that
       look after getting their own DNS records and cleaning themselves
       up, in particular preventing races in acquiring and relinquishing
       the fscache token for the cell.

   (6) Volume caching is overhauled. The afs_vlocation record is got rid
       of to simplify things and the superblock is now keyed on the cell
       and the numeric volume ID only. The volume record is tied to a
       superblock and normal superblock management is used to mediate
       the lifetime of the volume fscache token.

   (7) File server record caching is overhauled to make server records
       independent of cells and volumes. A server can be in multiple
       cells (in such a case, the administrator must make sure that the
       VL services for all cells correctly reflect the volumes shared
       between those cells).

       Server records are now indexed using the UUID of the server
       rather than the address since a server can have multiple
       addresses.

   (8) File server rotation is overhauled to handle VMOVED, VBUSY (and
       similar), VOFFLINE and VNOVOL indications and to handle rotation
       both of servers and addresses of those servers. The rotation will
       also wait and retry if the server says it is busy.

   (9) Data writeback is overhauled. Each inode no longer stores a list
       of modified sections tagged with the key that authorised it in
       favour of noting the modified region of a page in page->private
       and storing a list of keys that made modifications in the inode.

       This simplifies things and allows other keys to be used to
       actually write to the server if a key that made a modification
       becomes useless.

  (10) Writable mmap() is implemented. This allows a kernel to be build
       entirely on AFS.

  Note that Pre AFS-3.4 servers are no longer supported, though this can
  be added back if necessary (AFS-3.4 was released in 1998)"

* tag 'afs-next-20171113' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: (35 commits)
  afs: Protect call->state changes against signals
  afs: Trace page dirty/clean
  afs: Implement shared-writeable mmap
  afs: Get rid of the afs_writeback record
  afs: Introduce a file-private data record
  afs: Use a dynamic port if 7001 is in use
  afs: Fix directory read/modify race
  afs: Trace the sending of pages
  afs: Trace the initiation and completion of client calls
  afs: Fix documentation on # vs % prefix in mount source specification
  afs: Fix total-length calculation for multiple-page send
  afs: Only progress call state at end of Tx phase from rxrpc callback
  afs: Make use of the YFS service upgrade to fully support IPv6
  afs: Overhaul volume and server record caching and fileserver rotation
  afs: Move server rotation code into its own file
  afs: Add an address list concept
  afs: Overhaul cell database management
  afs: Overhaul permit caching
  afs: Overhaul the callback handling
  afs: Rename struct afs_call server member to cm_server
  ...

1 files changed, 69 insertions, 4 deletions

diff --git a/fs/afs/afs_vl.h b/fs/afs/afs_vl.h
index 800f607ffaf5..e3c4688f573b 100644
--- a/fs/afs/afs_vl.h
+++ b/fs/afs/afs_vl.h
@@ -16,11 +16,17 @@
 
 #define AFS_VL_PORT		7003	/* volume location service port */
 #define VL_SERVICE		52	/* RxRPC service ID for the Volume Location service */
+#define YFS_VL_SERVICE		2503	/* Service ID for AuriStor upgraded VL service */
 
 enum AFSVL_Operations {
-	VLGETENTRYBYID		= 503,	/* AFS Get Cache Entry By ID operation ID */
-	VLGETENTRYBYNAME	= 504,	/* AFS Get Cache Entry By Name operation ID */
-	VLPROBE			= 514,	/* AFS Probe Volume Location Service operation ID */
+	VLGETENTRYBYID		= 503,	/* AFS Get VLDB entry by ID */
+	VLGETENTRYBYNAME	= 504,	/* AFS Get VLDB entry by name */
+	VLPROBE			= 514,	/* AFS probe VL service */
+	VLGETENTRYBYIDU		= 526,	/* AFS Get VLDB entry by ID (UUID-variant) */
+	VLGETENTRYBYNAMEU	= 527,	/* AFS Get VLDB entry by name (UUID-variant) */
+	VLGETADDRSU		= 533,	/* AFS Get addrs for fileserver */
+	YVLGETENDPOINTS		= 64002, /* YFS Get endpoints for file/volume server */
+	VLGETCAPABILITIES	= 65537, /* AFS Get server capabilities */
 };
 
 enum AFSVL_Errors {
@@ -54,6 +60,19 @@ enum AFSVL_Errors {
 	AFSVL_NOMEM 		= 363547,	/* malloc/realloc failed to alloc enough memory */
 };
 
+enum {
+	YFS_SERVER_INDEX	= 0,
+	YFS_SERVER_UUID		= 1,
+	YFS_SERVER_ENDPOINT	= 2,
+};
+
+enum {
+	YFS_ENDPOINT_IPV4	= 0,
+	YFS_ENDPOINT_IPV6	= 1,
+};
+
+#define YFS_MAXENDPOINTS	16
+
 /*
  * maps to "struct vldbentry" in vvl-spec.pdf
  */
@@ -74,11 +93,57 @@ struct afs_vldbentry {
 		struct in_addr	addr;		/* server address */
 		unsigned	partition;	/* partition ID on this server */
 		unsigned	flags;		/* server specific flags */
-#define AFS_VLSF_NEWREPSITE	0x0001	/* unused */
+#define AFS_VLSF_NEWREPSITE	0x0001	/* Ignore all 'non-new' servers */
 #define AFS_VLSF_ROVOL		0x0002	/* this server holds a R/O instance of the volume */
 #define AFS_VLSF_RWVOL		0x0004	/* this server holds a R/W instance of the volume */
 #define AFS_VLSF_BACKVOL	0x0008	/* this server holds a backup instance of the volume */
+#define AFS_VLSF_UUID		0x0010	/* This server is referred to by its UUID */
+#define AFS_VLSF_DONTUSE	0x0020	/* This server ref should be ignored */
 	} servers[8];
 };
 
+#define AFS_VLDB_MAXNAMELEN 65
+
+
+struct afs_ListAddrByAttributes__xdr {
+	__be32			Mask;
+#define AFS_VLADDR_IPADDR	0x1	/* Match by ->ipaddr */
+#define AFS_VLADDR_INDEX	0x2	/* Match by ->index */
+#define AFS_VLADDR_UUID		0x4	/* Match by ->uuid */
+	__be32			ipaddr;
+	__be32			index;
+	__be32			spare;
+	struct afs_uuid__xdr	uuid;
+};
+
+struct afs_uvldbentry__xdr {
+	__be32			name[AFS_VLDB_MAXNAMELEN];
+	__be32			nServers;
+	struct afs_uuid__xdr	serverNumber[AFS_NMAXNSERVERS];
+	__be32			serverUnique[AFS_NMAXNSERVERS];
+	__be32			serverPartition[AFS_NMAXNSERVERS];
+	__be32			serverFlags[AFS_NMAXNSERVERS];
+	__be32			volumeId[AFS_MAXTYPES];
+	__be32			cloneId;
+	__be32			flags;
+	__be32			spares1;
+	__be32			spares2;
+	__be32			spares3;
+	__be32			spares4;
+	__be32			spares5;
+	__be32			spares6;
+	__be32			spares7;
+	__be32			spares8;
+	__be32			spares9;
+};
+
+struct afs_address_list {
+	refcount_t		usage;
+	unsigned int		version;
+	unsigned int		nr_addrs;
+	struct sockaddr_rxrpc	addrs[];
+};
+
+extern void afs_put_address_list(struct afs_address_list *alist);
+
 #endif /* AFS_VL_H */