2011-07-31 08:52:39 +08:00
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/*
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* linux/fs/nfs/blocklayout/blocklayout.c
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*
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* Module for the NFSv4.1 pNFS block layout driver.
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*
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* Copyright (c) 2006 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@citi.umich.edu>
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* Fred Isaman <iisaman@umich.edu>
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*
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* permission is granted to use, copy, create derivative works and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the university of michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. if
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* the above copyright notice or any other identification of the
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* university of michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* this software is provided as is, without representation from the
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* university of michigan as to its fitness for any purpose, and without
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* warranty by the university of michigan of any kind, either express
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* or implied, including without limitation the implied warranties of
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* merchantability and fitness for a particular purpose. the regents
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* of the university of michigan shall not be liable for any damages,
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* including special, indirect, incidental, or consequential damages,
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* with respect to any claim arising out or in connection with the use
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* of the software, even if it has been or is hereafter advised of the
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* possibility of such damages.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include "blocklayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
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MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
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static enum pnfs_try_status
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bl_read_pagelist(struct nfs_read_data *rdata)
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{
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return PNFS_NOT_ATTEMPTED;
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}
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static enum pnfs_try_status
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bl_write_pagelist(struct nfs_write_data *wdata,
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int sync)
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{
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return PNFS_NOT_ATTEMPTED;
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}
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2011-07-31 08:52:41 +08:00
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/* FIXME - range ignored */
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2011-07-31 08:52:39 +08:00
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static void
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2011-07-31 08:52:41 +08:00
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release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range)
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2011-07-31 08:52:39 +08:00
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{
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2011-07-31 08:52:41 +08:00
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int i;
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struct pnfs_block_extent *be;
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spin_lock(&bl->bl_ext_lock);
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for (i = 0; i < EXTENT_LISTS; i++) {
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while (!list_empty(&bl->bl_extents[i])) {
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be = list_first_entry(&bl->bl_extents[i],
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struct pnfs_block_extent,
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be_node);
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list_del(&be->be_node);
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bl_put_extent(be);
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}
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}
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spin_unlock(&bl->bl_ext_lock);
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2011-07-31 08:52:39 +08:00
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}
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/* STUB */
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static void
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release_inval_marks(struct pnfs_inval_markings *marks)
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{
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return;
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}
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static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
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{
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struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
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dprintk("%s enter\n", __func__);
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release_extents(bl, NULL);
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release_inval_marks(&bl->bl_inval);
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kfree(bl);
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}
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static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
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gfp_t gfp_flags)
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{
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struct pnfs_block_layout *bl;
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dprintk("%s enter\n", __func__);
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bl = kzalloc(sizeof(*bl), gfp_flags);
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if (!bl)
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return NULL;
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spin_lock_init(&bl->bl_ext_lock);
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INIT_LIST_HEAD(&bl->bl_extents[0]);
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INIT_LIST_HEAD(&bl->bl_extents[1]);
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INIT_LIST_HEAD(&bl->bl_commit);
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INIT_LIST_HEAD(&bl->bl_committing);
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bl->bl_count = 0;
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bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT;
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BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize);
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return &bl->bl_layout;
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}
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static void
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bl_free_lseg(struct pnfs_layout_segment *lseg)
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{
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}
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static struct pnfs_layout_segment *
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bl_alloc_lseg(struct pnfs_layout_hdr *lo,
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struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
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{
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return NULL;
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}
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static void
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bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
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const struct nfs4_layoutcommit_args *arg)
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{
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}
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static void
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bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
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{
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}
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static int
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bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
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{
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dprintk("%s enter\n", __func__);
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return 0;
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}
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static int
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bl_clear_layoutdriver(struct nfs_server *server)
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{
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dprintk("%s enter\n", __func__);
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return 0;
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}
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2011-07-31 08:52:40 +08:00
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static const struct nfs_pageio_ops bl_pg_read_ops = {
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.pg_init = pnfs_generic_pg_init_read,
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.pg_test = pnfs_generic_pg_test,
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.pg_doio = pnfs_generic_pg_readpages,
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};
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static const struct nfs_pageio_ops bl_pg_write_ops = {
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.pg_init = pnfs_generic_pg_init_write,
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.pg_test = pnfs_generic_pg_test,
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.pg_doio = pnfs_generic_pg_writepages,
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};
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2011-07-31 08:52:39 +08:00
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static struct pnfs_layoutdriver_type blocklayout_type = {
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.id = LAYOUT_BLOCK_VOLUME,
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.name = "LAYOUT_BLOCK_VOLUME",
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.read_pagelist = bl_read_pagelist,
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.write_pagelist = bl_write_pagelist,
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.alloc_layout_hdr = bl_alloc_layout_hdr,
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.free_layout_hdr = bl_free_layout_hdr,
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.alloc_lseg = bl_alloc_lseg,
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.free_lseg = bl_free_lseg,
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.encode_layoutcommit = bl_encode_layoutcommit,
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.cleanup_layoutcommit = bl_cleanup_layoutcommit,
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.set_layoutdriver = bl_set_layoutdriver,
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.clear_layoutdriver = bl_clear_layoutdriver,
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2011-07-31 08:52:40 +08:00
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.pg_read_ops = &bl_pg_read_ops,
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.pg_write_ops = &bl_pg_write_ops,
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2011-07-31 08:52:39 +08:00
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};
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static int __init nfs4blocklayout_init(void)
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{
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int ret;
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dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
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ret = pnfs_register_layoutdriver(&blocklayout_type);
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return ret;
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}
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static void __exit nfs4blocklayout_exit(void)
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{
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dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
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__func__);
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pnfs_unregister_layoutdriver(&blocklayout_type);
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}
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MODULE_ALIAS("nfs-layouttype4-3");
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module_init(nfs4blocklayout_init);
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module_exit(nfs4blocklayout_exit);
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