pnfsblock: add blocklayout Kconfig option, Makefile, and stubs
Define a configuration variable to enable/disable compilation of the
block driver code.
Add the minimal structure for a pnfs block layout driver, and empty
list-heads that will hold the extent data
[pnfsblock: make NFS_V4_1 select PNFS_BLOCK]
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[pnfs-block: fix CONFIG_PNFS_BLOCK dependencies]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[pnfsblock: SQUASHME: adjust to API change]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfs: move pnfs_layout_type inline in nfs_inode]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[blocklayout: encode_layoutcommit implementation]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[pnfsblock: layout alloc and free]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfs: move pnfs_layout_type inline in nfs_inode]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[pnfsblock: define module alias]
Signed-off-by: Peng Tao <peng_tao@emc.com>
[rm inode and pnfs_layout_hdr args from cleanup_layoutcommit()]
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
new file mode 100644
index 0000000..44562cb
--- /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);