mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Trond Myklebust](/assets/img/avatar_default.png)
Use of synchronize_rcu() when unmounting and potentially freeing a lot of deviceids is problematic. There really is no reason why we can't just use kfree_rcu() here. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
299 lines
8.3 KiB
C
299 lines
8.3 KiB
C
/*
|
|
* Device operations for the pnfs nfs4 file layout driver.
|
|
*
|
|
* Copyright (c) 2002
|
|
* The Regents of the University of Michigan
|
|
* All Rights Reserved
|
|
*
|
|
* Dean Hildebrand <dhildebz@umich.edu>
|
|
* Garth Goodson <Garth.Goodson@netapp.com>
|
|
*
|
|
* 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 or warranty
|
|
* of any kind either express or implied, including without limitation
|
|
* the implied warranties of merchantability, fitness for a particular
|
|
* purpose, or noninfringement. 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 of 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/nfs_fs.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "../internal.h"
|
|
#include "../nfs4session.h"
|
|
#include "filelayout.h"
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
|
|
|
|
static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
|
|
static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
|
|
|
|
void
|
|
nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
|
|
{
|
|
struct nfs4_pnfs_ds *ds;
|
|
int i;
|
|
|
|
nfs4_print_deviceid(&dsaddr->id_node.deviceid);
|
|
|
|
for (i = 0; i < dsaddr->ds_num; i++) {
|
|
ds = dsaddr->ds_list[i];
|
|
if (ds != NULL)
|
|
nfs4_pnfs_ds_put(ds);
|
|
}
|
|
kfree(dsaddr->stripe_indices);
|
|
kfree_rcu(dsaddr, id_node.rcu);
|
|
}
|
|
|
|
/* Decode opaque device data and return the result */
|
|
struct nfs4_file_layout_dsaddr *
|
|
nfs4_fl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
|
|
gfp_t gfp_flags)
|
|
{
|
|
int i;
|
|
u32 cnt, num;
|
|
u8 *indexp;
|
|
__be32 *p;
|
|
u8 *stripe_indices;
|
|
u8 max_stripe_index;
|
|
struct nfs4_file_layout_dsaddr *dsaddr = NULL;
|
|
struct xdr_stream stream;
|
|
struct xdr_buf buf;
|
|
struct page *scratch;
|
|
struct list_head dsaddrs;
|
|
struct nfs4_pnfs_ds_addr *da;
|
|
|
|
/* set up xdr stream */
|
|
scratch = alloc_page(gfp_flags);
|
|
if (!scratch)
|
|
goto out_err;
|
|
|
|
xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
|
|
xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
|
|
|
|
/* Get the stripe count (number of stripe index) */
|
|
p = xdr_inline_decode(&stream, 4);
|
|
if (unlikely(!p))
|
|
goto out_err_free_scratch;
|
|
|
|
cnt = be32_to_cpup(p);
|
|
dprintk("%s stripe count %d\n", __func__, cnt);
|
|
if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
|
|
printk(KERN_WARNING "NFS: %s: stripe count %d greater than "
|
|
"supported maximum %d\n", __func__,
|
|
cnt, NFS4_PNFS_MAX_STRIPE_CNT);
|
|
goto out_err_free_scratch;
|
|
}
|
|
|
|
/* read stripe indices */
|
|
stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags);
|
|
if (!stripe_indices)
|
|
goto out_err_free_scratch;
|
|
|
|
p = xdr_inline_decode(&stream, cnt << 2);
|
|
if (unlikely(!p))
|
|
goto out_err_free_stripe_indices;
|
|
|
|
indexp = &stripe_indices[0];
|
|
max_stripe_index = 0;
|
|
for (i = 0; i < cnt; i++) {
|
|
*indexp = be32_to_cpup(p++);
|
|
max_stripe_index = max(max_stripe_index, *indexp);
|
|
indexp++;
|
|
}
|
|
|
|
/* Check the multipath list count */
|
|
p = xdr_inline_decode(&stream, 4);
|
|
if (unlikely(!p))
|
|
goto out_err_free_stripe_indices;
|
|
|
|
num = be32_to_cpup(p);
|
|
dprintk("%s ds_num %u\n", __func__, num);
|
|
if (num > NFS4_PNFS_MAX_MULTI_CNT) {
|
|
printk(KERN_WARNING "NFS: %s: multipath count %d greater than "
|
|
"supported maximum %d\n", __func__,
|
|
num, NFS4_PNFS_MAX_MULTI_CNT);
|
|
goto out_err_free_stripe_indices;
|
|
}
|
|
|
|
/* validate stripe indices are all < num */
|
|
if (max_stripe_index >= num) {
|
|
printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n",
|
|
__func__, max_stripe_index, num);
|
|
goto out_err_free_stripe_indices;
|
|
}
|
|
|
|
dsaddr = kzalloc(sizeof(*dsaddr) +
|
|
(sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
|
|
gfp_flags);
|
|
if (!dsaddr)
|
|
goto out_err_free_stripe_indices;
|
|
|
|
dsaddr->stripe_count = cnt;
|
|
dsaddr->stripe_indices = stripe_indices;
|
|
stripe_indices = NULL;
|
|
dsaddr->ds_num = num;
|
|
nfs4_init_deviceid_node(&dsaddr->id_node, server, &pdev->dev_id);
|
|
|
|
INIT_LIST_HEAD(&dsaddrs);
|
|
|
|
for (i = 0; i < dsaddr->ds_num; i++) {
|
|
int j;
|
|
u32 mp_count;
|
|
|
|
p = xdr_inline_decode(&stream, 4);
|
|
if (unlikely(!p))
|
|
goto out_err_free_deviceid;
|
|
|
|
mp_count = be32_to_cpup(p); /* multipath count */
|
|
for (j = 0; j < mp_count; j++) {
|
|
da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
|
|
&stream, gfp_flags);
|
|
if (da)
|
|
list_add_tail(&da->da_node, &dsaddrs);
|
|
}
|
|
if (list_empty(&dsaddrs)) {
|
|
dprintk("%s: no suitable DS addresses found\n",
|
|
__func__);
|
|
goto out_err_free_deviceid;
|
|
}
|
|
|
|
dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
|
|
if (!dsaddr->ds_list[i])
|
|
goto out_err_drain_dsaddrs;
|
|
|
|
/* If DS was already in cache, free ds addrs */
|
|
while (!list_empty(&dsaddrs)) {
|
|
da = list_first_entry(&dsaddrs,
|
|
struct nfs4_pnfs_ds_addr,
|
|
da_node);
|
|
list_del_init(&da->da_node);
|
|
kfree(da->da_remotestr);
|
|
kfree(da);
|
|
}
|
|
}
|
|
|
|
__free_page(scratch);
|
|
return dsaddr;
|
|
|
|
out_err_drain_dsaddrs:
|
|
while (!list_empty(&dsaddrs)) {
|
|
da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
|
|
da_node);
|
|
list_del_init(&da->da_node);
|
|
kfree(da->da_remotestr);
|
|
kfree(da);
|
|
}
|
|
out_err_free_deviceid:
|
|
nfs4_fl_free_deviceid(dsaddr);
|
|
/* stripe_indicies was part of dsaddr */
|
|
goto out_err_free_scratch;
|
|
out_err_free_stripe_indices:
|
|
kfree(stripe_indices);
|
|
out_err_free_scratch:
|
|
__free_page(scratch);
|
|
out_err:
|
|
dprintk("%s ERROR: returning NULL\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
|
|
{
|
|
nfs4_put_deviceid_node(&dsaddr->id_node);
|
|
}
|
|
|
|
/*
|
|
* Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
|
|
* Then: ((res + fsi) % dsaddr->stripe_count)
|
|
*/
|
|
u32
|
|
nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
|
|
{
|
|
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
|
|
u64 tmp;
|
|
|
|
tmp = offset - flseg->pattern_offset;
|
|
do_div(tmp, flseg->stripe_unit);
|
|
tmp += flseg->first_stripe_index;
|
|
return do_div(tmp, flseg->dsaddr->stripe_count);
|
|
}
|
|
|
|
u32
|
|
nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
|
|
{
|
|
return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
|
|
}
|
|
|
|
struct nfs_fh *
|
|
nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
|
|
{
|
|
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
|
|
u32 i;
|
|
|
|
if (flseg->stripe_type == STRIPE_SPARSE) {
|
|
if (flseg->num_fh == 1)
|
|
i = 0;
|
|
else if (flseg->num_fh == 0)
|
|
/* Use the MDS OPEN fh set in nfs_read_rpcsetup */
|
|
return NULL;
|
|
else
|
|
i = nfs4_fl_calc_ds_index(lseg, j);
|
|
} else
|
|
i = j;
|
|
return flseg->fh_array[i];
|
|
}
|
|
|
|
/* Upon return, either ds is connected, or ds is NULL */
|
|
struct nfs4_pnfs_ds *
|
|
nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
|
|
{
|
|
struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr;
|
|
struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx];
|
|
struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
|
|
struct nfs4_pnfs_ds *ret = ds;
|
|
struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
|
|
|
|
if (ds == NULL) {
|
|
printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
|
|
__func__, ds_idx);
|
|
pnfs_generic_mark_devid_invalid(devid);
|
|
goto out;
|
|
}
|
|
smp_rmb();
|
|
if (ds->ds_clp)
|
|
goto out_test_devid;
|
|
|
|
nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
|
|
dataserver_retrans, 4,
|
|
s->nfs_client->cl_minorversion,
|
|
s->nfs_client->cl_rpcclient->cl_auth->au_flavor);
|
|
|
|
out_test_devid:
|
|
if (filelayout_test_devid_unavailable(devid))
|
|
ret = NULL;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
module_param(dataserver_retrans, uint, 0644);
|
|
MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
|
|
"retries a request before it attempts further "
|
|
" recovery action.");
|
|
module_param(dataserver_timeo, uint, 0644);
|
|
MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
|
|
"NFSv4.1 client waits for a response from a "
|
|
" data server before it retries an NFS request.");
|