diff options
Diffstat (limited to 'fs/nfs/blocklayout/blocklayout.c')
| -rw-r--r-- | fs/nfs/blocklayout/blocklayout.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c new file mode 100644 index 00000000000..44562cbbe39 --- /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); |