Commit 9e692969 authored by Fred Isaman's avatar Fred Isaman Committed by Trond Myklebust

pnfsblock: basic extent code

Adds structures and basic create/delete code for extents.
Signed-off-by: default avatarFred Isaman <iisaman@citi.umich.edu>
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
Signed-off-by: default avatarZhang Jingwang <Jingwang.Zhang@emc.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@tonian.com>
Signed-off-by: default avatarJim Rees <rees@umich.edu>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent e9643fe8
...@@ -2,4 +2,4 @@ ...@@ -2,4 +2,4 @@
# Makefile for the pNFS block layout driver kernel module # Makefile for the pNFS block layout driver kernel module
# #
obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
blocklayoutdriver-objs := blocklayout.o blocklayoutdriver-objs := blocklayout.o extents.o
...@@ -53,12 +53,24 @@ bl_write_pagelist(struct nfs_write_data *wdata, ...@@ -53,12 +53,24 @@ bl_write_pagelist(struct nfs_write_data *wdata,
return PNFS_NOT_ATTEMPTED; return PNFS_NOT_ATTEMPTED;
} }
/* STUB */ /* FIXME - range ignored */
static void static void
release_extents(struct pnfs_block_layout *bl, release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range)
struct pnfs_layout_range *range)
{ {
return; 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 */ /* STUB */
......
...@@ -88,4 +88,5 @@ static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo) ...@@ -88,4 +88,5 @@ static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
return container_of(lo, struct pnfs_block_layout, bl_layout); return container_of(lo, struct pnfs_block_layout, bl_layout);
} }
void bl_put_extent(struct pnfs_block_extent *be);
#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
/*
* 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.
*/
#include "blocklayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
static void print_bl_extent(struct pnfs_block_extent *be)
{
dprintk("PRINT EXTENT extent %p\n", be);
if (be) {
dprintk(" be_f_offset %llu\n", (u64)be->be_f_offset);
dprintk(" be_length %llu\n", (u64)be->be_length);
dprintk(" be_v_offset %llu\n", (u64)be->be_v_offset);
dprintk(" be_state %d\n", be->be_state);
}
}
static void
destroy_extent(struct kref *kref)
{
struct pnfs_block_extent *be;
be = container_of(kref, struct pnfs_block_extent, be_refcnt);
dprintk("%s be=%p\n", __func__, be);
kfree(be);
}
void
bl_put_extent(struct pnfs_block_extent *be)
{
if (be) {
dprintk("%s enter %p (%i)\n", __func__, be,
atomic_read(&be->be_refcnt.refcount));
kref_put(&be->be_refcnt, destroy_extent);
}
}
struct pnfs_block_extent *bl_alloc_extent(void)
{
struct pnfs_block_extent *be;
be = kmalloc(sizeof(struct pnfs_block_extent), GFP_NOFS);
if (!be)
return NULL;
INIT_LIST_HEAD(&be->be_node);
kref_init(&be->be_refcnt);
be->be_inval = NULL;
return be;
}
static void print_elist(struct list_head *list)
{
struct pnfs_block_extent *be;
dprintk("****************\n");
dprintk("Extent list looks like:\n");
list_for_each_entry(be, list, be_node) {
print_bl_extent(be);
}
dprintk("****************\n");
}
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