linux/fs/nfs/blocklayout/blocklayout.c
Fred Isaman a60d2ebd93 pnfsblock: lseg alloc and free
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfsblock: fix bug getting pnfs_layout_type in translate_devid().]
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Zhang Jingwang <Jingwang.Zhang@emc.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-07-31 12:18:16 -04:00

262 lines
6.7 KiB
C

/*
* 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 <linux/mount.h>
#include <linux/namei.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");
struct dentry *bl_device_pipe;
wait_queue_head_t bl_wq;
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;
}
/* FIXME - range ignored */
static void
release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range)
{
int i;
struct pnfs_block_extent *be;
spin_lock(&bl->bl_ext_lock);
for (i = 0; i < EXTENT_LISTS; i++) {
while (!list_empty(&bl->bl_extents[i])) {
be = list_first_entry(&bl->bl_extents[i],
struct pnfs_block_extent,
be_node);
list_del(&be->be_node);
bl_put_extent(be);
}
}
spin_unlock(&bl->bl_ext_lock);
}
/* 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)
{
dprintk("%s enter\n", __func__);
kfree(lseg);
}
/* We pretty much ignore lseg, and store all data layout wide, so we
* can correctly merge.
*/
static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
struct nfs4_layoutget_res *lgr,
gfp_t gfp_flags)
{
struct pnfs_layout_segment *lseg;
int status;
dprintk("%s enter\n", __func__);
lseg = kzalloc(sizeof(*lseg), gfp_flags);
if (!lseg)
return ERR_PTR(-ENOMEM);
status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags);
if (status) {
/* We don't want to call the full-blown bl_free_lseg,
* since on error extents were not touched.
*/
kfree(lseg);
return ERR_PTR(status);
}
return lseg;
}
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 const struct nfs_pageio_ops bl_pg_read_ops = {
.pg_init = pnfs_generic_pg_init_read,
.pg_test = pnfs_generic_pg_test,
.pg_doio = pnfs_generic_pg_readpages,
};
static const struct nfs_pageio_ops bl_pg_write_ops = {
.pg_init = pnfs_generic_pg_init_write,
.pg_test = pnfs_generic_pg_test,
.pg_doio = pnfs_generic_pg_writepages,
};
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,
.pg_read_ops = &bl_pg_read_ops,
.pg_write_ops = &bl_pg_write_ops,
};
static const struct rpc_pipe_ops bl_upcall_ops = {
.upcall = bl_pipe_upcall,
.downcall = bl_pipe_downcall,
.destroy_msg = bl_pipe_destroy_msg,
};
static int __init nfs4blocklayout_init(void)
{
struct vfsmount *mnt;
struct path path;
int ret;
dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
ret = pnfs_register_layoutdriver(&blocklayout_type);
if (ret)
goto out;
init_waitqueue_head(&bl_wq);
mnt = rpc_get_mount();
if (IS_ERR(mnt)) {
ret = PTR_ERR(mnt);
goto out_remove;
}
ret = vfs_path_lookup(mnt->mnt_root,
mnt,
NFS_PIPE_DIRNAME, 0, &path);
if (ret)
goto out_remove;
bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL,
&bl_upcall_ops, 0);
if (IS_ERR(bl_device_pipe)) {
ret = PTR_ERR(bl_device_pipe);
goto out_remove;
}
out:
return ret;
out_remove:
pnfs_unregister_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);
rpc_unlink(bl_device_pipe);
}
MODULE_ALIAS("nfs-layouttype4-3");
module_init(nfs4blocklayout_init);
module_exit(nfs4blocklayout_exit);