5 files changed, 278 insertions, 1 deletions

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 2cde5d954750..be020771c6b4 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -79,15 +79,21 @@ config NFS_V4_1
         depends on NFS_FS && NFS_V4 && EXPERIMENTAL
         select SUNRPC_BACKCHANNEL
         select PNFS_FILE_LAYOUT
+        select PNFS_BLOCK
+        select MD
+        select BLK_DEV_DM
         help
           This option enables support for minor version 1 of the NFSv4 protocol
-          (RFC 5661) in the kernel's NFS client.
+          (RFC 5661 and RFC 5663) in the kernel's NFS client.
 
           If unsure, say N.
 
 config PNFS_FILE_LAYOUT
         tristate
 
+config PNFS_BLOCK
+        tristate
+
 config PNFS_OBJLAYOUT
         tristate "Provide support for the pNFS Objects Layout Driver for NFSv4.1 pNFS (EXPERIMENTAL)"
         depends on NFS_FS && NFS_V4_1 && SCSI_OSD_ULD
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 6a34f7dd0e6f..b58613d0abb3 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -23,3 +23,4 @@ obj-$(CONFIG_PNFS_FILE_LAYOUT) += nfs_layout_nfsv41_files.o
 nfs_layout_nfsv41_files-y := nfs4filelayout.o nfs4filelayoutdev.o
 
 obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayout/
+obj-$(CONFIG_PNFS_BLOCK) += blocklayout/
diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile
new file mode 100644
index 000000000000..6bf49cd5da06
--- /dev/null
+++ b/fs/nfs/blocklayout/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the pNFS block layout driver kernel module
+#
+obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
+blocklayoutdriver-objs := blocklayout.o
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
new file mode 100644
index 000000000000..44562cbbe394
--- /dev/null
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -0,0 +1,174 @@
+/*
+ *  linux/fs/nfs/blocklayout/blocklayout.c
+ *
+ *  Module for the NFSv4.1 pNFS block layout driver.
+ *
+ *  Copyright (c) 2006 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson <andros@citi.umich.edu>
+ *  Fred Isaman <iisaman@umich.edu>
+ *
+ * permission is granted to use, copy, create derivative works and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the university of michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization.  if
+ * the above copyright notice or any other identification of the
+ * university of michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * this software is provided as is, without representation from the
+ * university of michigan as to its fitness for any purpose, and without
+ * warranty by the university of michigan of any kind, either express
+ * or implied, including without limitation the implied warranties of
+ * merchantability and fitness for a particular purpose.  the regents
+ * of the university of michigan shall not be liable for any damages,
+ * including special, indirect, incidental, or consequential damages,
+ * with respect to any claim arising out or in connection with the use
+ * of the software, even if it has been or is hereafter advised of the
+ * possibility of such damages.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include "blocklayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
+MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
+
+static enum pnfs_try_status
+bl_read_pagelist(struct nfs_read_data *rdata)
+{
+        return PNFS_NOT_ATTEMPTED;
+}
+
+static enum pnfs_try_status
+bl_write_pagelist(struct nfs_write_data *wdata,
+                  int sync)
+{
+        return PNFS_NOT_ATTEMPTED;
+}
+
+/* STUB */
+static void
+release_extents(struct pnfs_block_layout *bl,
+                struct pnfs_layout_range *range)
+{
+        return;
+}
+
+/* STUB */
+static void
+release_inval_marks(struct pnfs_inval_markings *marks)
+{
+        return;
+}
+
+static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
+{
+        struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
+
+        dprintk("%s enter\n", __func__);
+        release_extents(bl, NULL);
+        release_inval_marks(&bl->bl_inval);
+        kfree(bl);
+}
+
+static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
+                                                   gfp_t gfp_flags)
+{
+        struct pnfs_block_layout *bl;
+
+        dprintk("%s enter\n", __func__);
+        bl = kzalloc(sizeof(*bl), gfp_flags);
+        if (!bl)
+                return NULL;
+        spin_lock_init(&bl->bl_ext_lock);
+        INIT_LIST_HEAD(&bl->bl_extents[0]);
+        INIT_LIST_HEAD(&bl->bl_extents[1]);
+        INIT_LIST_HEAD(&bl->bl_commit);
+        INIT_LIST_HEAD(&bl->bl_committing);
+        bl->bl_count = 0;
+        bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT;
+        BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize);
+        return &bl->bl_layout;
+}
+
+static void
+bl_free_lseg(struct pnfs_layout_segment *lseg)
+{
+}
+
+static struct pnfs_layout_segment *
+bl_alloc_lseg(struct pnfs_layout_hdr *lo,
+              struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
+{
+        return NULL;
+}
+
+static void
+bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
+                       const struct nfs4_layoutcommit_args *arg)
+{
+}
+
+static void
+bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
+{
+}
+
+static int
+bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
+{
+        dprintk("%s enter\n", __func__);
+        return 0;
+}
+
+static int
+bl_clear_layoutdriver(struct nfs_server *server)
+{
+        dprintk("%s enter\n", __func__);
+        return 0;
+}
+
+static struct pnfs_layoutdriver_type blocklayout_type = {
+        .id                             = LAYOUT_BLOCK_VOLUME,
+        .name                           = "LAYOUT_BLOCK_VOLUME",
+        .read_pagelist                  = bl_read_pagelist,
+        .write_pagelist                 = bl_write_pagelist,
+        .alloc_layout_hdr               = bl_alloc_layout_hdr,
+        .free_layout_hdr                = bl_free_layout_hdr,
+        .alloc_lseg                     = bl_alloc_lseg,
+        .free_lseg                      = bl_free_lseg,
+        .encode_layoutcommit            = bl_encode_layoutcommit,
+        .cleanup_layoutcommit           = bl_cleanup_layoutcommit,
+        .set_layoutdriver               = bl_set_layoutdriver,
+        .clear_layoutdriver             = bl_clear_layoutdriver,
+};
+
+static int __init nfs4blocklayout_init(void)
+{
+        int ret;
+
+        dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
+
+        ret = pnfs_register_layoutdriver(&blocklayout_type);
+        return ret;
+}
+
+static void __exit nfs4blocklayout_exit(void)
+{
+        dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
+               __func__);
+
+        pnfs_unregister_layoutdriver(&blocklayout_type);
+}
+
+MODULE_ALIAS("nfs-layouttype4-3");
+
+module_init(nfs4blocklayout_init);
+module_exit(nfs4blocklayout_exit);
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
new file mode 100644
index 000000000000..8bfa4668ff31
--- /dev/null
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -0,0 +1,91 @@
+/*
+ *  linux/fs/nfs/blocklayout/blocklayout.h
+ *
+ *  Module for the NFSv4.1 pNFS block layout driver.
+ *
+ *  Copyright (c) 2006 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson <andros@citi.umich.edu>
+ *  Fred Isaman <iisaman@umich.edu>
+ *
+ * permission is granted to use, copy, create derivative works and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the university of michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization.  if
+ * the above copyright notice or any other identification of the
+ * university of michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * this software is provided as is, without representation from the
+ * university of michigan as to its fitness for any purpose, and without
+ * warranty by the university of michigan of any kind, either express
+ * or implied, including without limitation the implied warranties of
+ * merchantability and fitness for a particular purpose.  the regents
+ * of the university of michigan shall not be liable for any damages,
+ * including special, indirect, incidental, or consequential damages,
+ * with respect to any claim arising out or in connection with the use
+ * of the software, even if it has been or is hereafter advised of the
+ * possibility of such damages.
+ */
+#ifndef FS_NFS_NFS4BLOCKLAYOUT_H
+#define FS_NFS_NFS4BLOCKLAYOUT_H
+
+#include <linux/device-mapper.h>
+#include <linux/nfs_fs.h>
+#include "../pnfs.h"
+
+enum exstate4 {
+        PNFS_BLOCK_READWRITE_DATA       = 0,
+        PNFS_BLOCK_READ_DATA            = 1,
+        PNFS_BLOCK_INVALID_DATA         = 2, /* mapped, but data is invalid */
+        PNFS_BLOCK_NONE_DATA            = 3  /* unmapped, it's a hole */
+};
+
+struct pnfs_inval_markings {
+        /* STUB */
+};
+
+/* sector_t fields are all in 512-byte sectors */
+struct pnfs_block_extent {
+        struct kref     be_refcnt;
+        struct list_head be_node;       /* link into lseg list */
+        struct nfs4_deviceid be_devid;  /* FIXME: could use device cache instead */
+        struct block_device *be_mdev;
+        sector_t        be_f_offset;    /* the starting offset in the file */
+        sector_t        be_length;      /* the size of the extent */
+        sector_t        be_v_offset;    /* the starting offset in the volume */
+        enum exstate4   be_state;       /* the state of this extent */
+        struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */
+};
+
+static inline void
+BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize)
+{
+        /* STUB */
+}
+
+enum extentclass4 {
+        RW_EXTENT       = 0, /* READWRTE and INVAL */
+        RO_EXTENT       = 1, /* READ and NONE */
+        EXTENT_LISTS    = 2,
+};
+
+struct pnfs_block_layout {
+        struct pnfs_layout_hdr bl_layout;
+        struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */
+        spinlock_t              bl_ext_lock;   /* Protects list manipulation */
+        struct list_head        bl_extents[EXTENT_LISTS]; /* R and RW extents */
+        struct list_head        bl_commit;      /* Needs layout commit */
+        struct list_head        bl_committing;  /* Layout committing */
+        unsigned int            bl_count;       /* entries in bl_commit */
+        sector_t                bl_blocksize;  /* Server blocksize in sectors */
+};
+
+static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
+{
+        return container_of(lo, struct pnfs_block_layout, bl_layout);
+}
+
+#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */