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linux-sg2042/fs/nfs/objlayout/objlayout.c

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/*
* pNFS Objects layout driver high level definitions
*
* Copyright (C) 2007 Panasas Inc. [year of first publication]
* All rights reserved.
*
* Benny Halevy <bhalevy@panasas.com>
* Boaz Harrosh <ooo@electrozaur.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* See the file COPYING included with this distribution for more details.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Panasas company nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kmod.h>
#include <linux/moduleparam.h>
#include <linux/ratelimit.h>
#include <scsi/osd_initiator.h>
#include "objlayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
/*
* Create a objlayout layout structure for the given inode and return it.
*/
struct pnfs_layout_hdr *
objlayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
{
struct objlayout *objlay;
objlay = kzalloc(sizeof(struct objlayout), gfp_flags);
if (!objlay)
return NULL;
spin_lock_init(&objlay->lock);
INIT_LIST_HEAD(&objlay->err_list);
dprintk("%s: Return %p\n", __func__, objlay);
return &objlay->pnfs_layout;
}
/*
* Free an objlayout layout structure
*/
void
objlayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct objlayout *objlay = OBJLAYOUT(lo);
dprintk("%s: objlay %p\n", __func__, objlay);
WARN_ON(!list_empty(&objlay->err_list));
kfree(objlay);
}
/*
* Unmarshall layout and store it in pnfslay.
*/
struct pnfs_layout_segment *
objlayout_alloc_lseg(struct pnfs_layout_hdr *pnfslay,
struct nfs4_layoutget_res *lgr,
gfp_t gfp_flags)
{
int status = -ENOMEM;
struct xdr_stream stream;
struct xdr_buf buf = {
.pages = lgr->layoutp->pages,
.page_len = lgr->layoutp->len,
.buflen = lgr->layoutp->len,
.len = lgr->layoutp->len,
};
struct page *scratch;
struct pnfs_layout_segment *lseg;
dprintk("%s: Begin pnfslay %p\n", __func__, pnfslay);
scratch = alloc_page(gfp_flags);
if (!scratch)
goto err_nofree;
xdr_init_decode(&stream, &buf, NULL);
xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
status = objio_alloc_lseg(&lseg, pnfslay, &lgr->range, &stream, gfp_flags);
if (unlikely(status)) {
dprintk("%s: objio_alloc_lseg Return err %d\n", __func__,
status);
goto err;
}
__free_page(scratch);
dprintk("%s: Return %p\n", __func__, lseg);
return lseg;
err:
__free_page(scratch);
err_nofree:
dprintk("%s: Err Return=>%d\n", __func__, status);
return ERR_PTR(status);
}
/*
* Free a layout segement
*/
void
objlayout_free_lseg(struct pnfs_layout_segment *lseg)
{
dprintk("%s: freeing layout segment %p\n", __func__, lseg);
if (unlikely(!lseg))
return;
objio_free_lseg(lseg);
}
/*
* I/O Operations
*/
static inline u64
end_offset(u64 start, u64 len)
{
u64 end;
end = start + len;
return end >= start ? end : NFS4_MAX_UINT64;
}
static void _fix_verify_io_params(struct pnfs_layout_segment *lseg,
struct page ***p_pages, unsigned *p_pgbase,
u64 offset, unsigned long count)
{
u64 lseg_end_offset;
BUG_ON(offset < lseg->pls_range.offset);
lseg_end_offset = end_offset(lseg->pls_range.offset,
lseg->pls_range.length);
BUG_ON(offset >= lseg_end_offset);
WARN_ON(offset + count > lseg_end_offset);
if (*p_pgbase > PAGE_SIZE) {
dprintk("%s: pgbase(0x%x) > PAGE_SIZE\n", __func__, *p_pgbase);
*p_pages += *p_pgbase >> PAGE_SHIFT;
*p_pgbase &= ~PAGE_MASK;
}
}
/*
* I/O done common code
*/
static void
objlayout_iodone(struct objlayout_io_res *oir)
{
if (likely(oir->status >= 0)) {
objio_free_result(oir);
} else {
struct objlayout *objlay = oir->objlay;
spin_lock(&objlay->lock);
objlay->delta_space_valid = OBJ_DSU_INVALID;
list_add(&objlay->err_list, &oir->err_list);
spin_unlock(&objlay->lock);
}
}
/*
* objlayout_io_set_result - Set an osd_error code on a specific osd comp.
*
* The @index component IO failed (error returned from target). Register
* the error for later reporting at layout-return.
*/
void
objlayout_io_set_result(struct objlayout_io_res *oir, unsigned index,
struct pnfs_osd_objid *pooid, int osd_error,
u64 offset, u64 length, bool is_write)
{
struct pnfs_osd_ioerr *ioerr = &oir->ioerrs[index];
BUG_ON(index >= oir->num_comps);
if (osd_error) {
ioerr->oer_component = *pooid;
ioerr->oer_comp_offset = offset;
ioerr->oer_comp_length = length;
ioerr->oer_iswrite = is_write;
ioerr->oer_errno = osd_error;
dprintk("%s: err[%d]: errno=%d is_write=%d dev(%llx:%llx) "
"par=0x%llx obj=0x%llx offset=0x%llx length=0x%llx\n",
__func__, index, ioerr->oer_errno,
ioerr->oer_iswrite,
_DEVID_LO(&ioerr->oer_component.oid_device_id),
_DEVID_HI(&ioerr->oer_component.oid_device_id),
ioerr->oer_component.oid_partition_id,
ioerr->oer_component.oid_object_id,
ioerr->oer_comp_offset,
ioerr->oer_comp_length);
} else {
/* User need not call if no error is reported */
ioerr->oer_errno = 0;
}
}
/* Function scheduled on rpc workqueue to call ->nfs_readlist_complete().
* This is because the osd completion is called with ints-off from
* the block layer
*/
static void _rpc_read_complete(struct work_struct *work)
{
struct rpc_task *task;
struct nfs_pgio_header *hdr;
dprintk("%s enter\n", __func__);
task = container_of(work, struct rpc_task, u.tk_work);
hdr = container_of(task, struct nfs_pgio_header, task);
pnfs_ld_read_done(hdr);
}
void
objlayout_read_done(struct objlayout_io_res *oir, ssize_t status, bool sync)
{
struct nfs_pgio_header *hdr = oir->rpcdata;
oir->status = hdr->task.tk_status = status;
if (status >= 0)
hdr->res.count = status;
else
hdr->pnfs_error = status;
objlayout_iodone(oir);
/* must not use oir after this point */
dprintk("%s: Return status=%zd eof=%d sync=%d\n", __func__,
status, hdr->res.eof, sync);
if (sync)
pnfs_ld_read_done(hdr);
else {
INIT_WORK(&hdr->task.u.tk_work, _rpc_read_complete);
schedule_work(&hdr->task.u.tk_work);
}
}
/*
* Perform sync or async reads.
*/
enum pnfs_try_status
objlayout_read_pagelist(struct nfs_pgio_header *hdr)
{
struct inode *inode = hdr->inode;
loff_t offset = hdr->args.offset;
size_t count = hdr->args.count;
int err;
loff_t eof;
eof = i_size_read(inode);
if (unlikely(offset + count > eof)) {
if (offset >= eof) {
err = 0;
hdr->res.count = 0;
hdr->res.eof = 1;
/*FIXME: do we need to call pnfs_ld_read_done() */
goto out;
}
count = eof - offset;
}
hdr->res.eof = (offset + count) >= eof;
_fix_verify_io_params(hdr->lseg, &hdr->args.pages,
&hdr->args.pgbase,
hdr->args.offset, hdr->args.count);
dprintk("%s: inode(%lx) offset 0x%llx count 0x%Zx eof=%d\n",
__func__, inode->i_ino, offset, count, hdr->res.eof);
err = objio_read_pagelist(hdr);
out:
if (unlikely(err)) {
hdr->pnfs_error = err;
dprintk("%s: Returned Error %d\n", __func__, err);
return PNFS_NOT_ATTEMPTED;
}
return PNFS_ATTEMPTED;
}
/* Function scheduled on rpc workqueue to call ->nfs_writelist_complete().
* This is because the osd completion is called with ints-off from
* the block layer
*/
static void _rpc_write_complete(struct work_struct *work)
{
struct rpc_task *task;
struct nfs_pgio_header *hdr;
dprintk("%s enter\n", __func__);
task = container_of(work, struct rpc_task, u.tk_work);
hdr = container_of(task, struct nfs_pgio_header, task);
pnfs_ld_write_done(hdr);
}
void
objlayout_write_done(struct objlayout_io_res *oir, ssize_t status, bool sync)
{
struct nfs_pgio_header *hdr = oir->rpcdata;
oir->status = hdr->task.tk_status = status;
if (status >= 0) {
hdr->res.count = status;
hdr->verf.committed = oir->committed;
} else {
hdr->pnfs_error = status;
}
objlayout_iodone(oir);
/* must not use oir after this point */
dprintk("%s: Return status %zd committed %d sync=%d\n", __func__,
status, hdr->verf.committed, sync);
if (sync)
pnfs_ld_write_done(hdr);
else {
INIT_WORK(&hdr->task.u.tk_work, _rpc_write_complete);
schedule_work(&hdr->task.u.tk_work);
}
}
/*
* Perform sync or async writes.
*/
enum pnfs_try_status
objlayout_write_pagelist(struct nfs_pgio_header *hdr, int how)
{
int err;
_fix_verify_io_params(hdr->lseg, &hdr->args.pages,
&hdr->args.pgbase,
hdr->args.offset, hdr->args.count);
err = objio_write_pagelist(hdr, how);
if (unlikely(err)) {
hdr->pnfs_error = err;
dprintk("%s: Returned Error %d\n", __func__, err);
return PNFS_NOT_ATTEMPTED;
}
return PNFS_ATTEMPTED;
}
void
objlayout_encode_layoutcommit(struct pnfs_layout_hdr *pnfslay,
struct xdr_stream *xdr,
const struct nfs4_layoutcommit_args *args)
{
struct objlayout *objlay = OBJLAYOUT(pnfslay);
struct pnfs_osd_layoutupdate lou;
__be32 *start;
dprintk("%s: Begin\n", __func__);
spin_lock(&objlay->lock);
lou.dsu_valid = (objlay->delta_space_valid == OBJ_DSU_VALID);
lou.dsu_delta = objlay->delta_space_used;
objlay->delta_space_used = 0;
objlay->delta_space_valid = OBJ_DSU_INIT;
lou.olu_ioerr_flag = !list_empty(&objlay->err_list);
spin_unlock(&objlay->lock);
start = xdr_reserve_space(xdr, 4);
BUG_ON(pnfs_osd_xdr_encode_layoutupdate(xdr, &lou));
*start = cpu_to_be32((xdr->p - start - 1) * 4);
dprintk("%s: Return delta_space_used %lld err %d\n", __func__,
lou.dsu_delta, lou.olu_ioerr_flag);
}
static int
err_prio(u32 oer_errno)
{
switch (oer_errno) {
case 0:
return 0;
case PNFS_OSD_ERR_RESOURCE:
return OSD_ERR_PRI_RESOURCE;
case PNFS_OSD_ERR_BAD_CRED:
return OSD_ERR_PRI_BAD_CRED;
case PNFS_OSD_ERR_NO_ACCESS:
return OSD_ERR_PRI_NO_ACCESS;
case PNFS_OSD_ERR_UNREACHABLE:
return OSD_ERR_PRI_UNREACHABLE;
case PNFS_OSD_ERR_NOT_FOUND:
return OSD_ERR_PRI_NOT_FOUND;
case PNFS_OSD_ERR_NO_SPACE:
return OSD_ERR_PRI_NO_SPACE;
default:
WARN_ON(1);
/* fallthrough */
case PNFS_OSD_ERR_EIO:
return OSD_ERR_PRI_EIO;
}
}
static void
merge_ioerr(struct pnfs_osd_ioerr *dest_err,
const struct pnfs_osd_ioerr *src_err)
{
u64 dest_end, src_end;
if (!dest_err->oer_errno) {
*dest_err = *src_err;
/* accumulated device must be blank */
memset(&dest_err->oer_component.oid_device_id, 0,
sizeof(dest_err->oer_component.oid_device_id));
return;
}
if (dest_err->oer_component.oid_partition_id !=
src_err->oer_component.oid_partition_id)
dest_err->oer_component.oid_partition_id = 0;
if (dest_err->oer_component.oid_object_id !=
src_err->oer_component.oid_object_id)
dest_err->oer_component.oid_object_id = 0;
if (dest_err->oer_comp_offset > src_err->oer_comp_offset)
dest_err->oer_comp_offset = src_err->oer_comp_offset;
dest_end = end_offset(dest_err->oer_comp_offset,
dest_err->oer_comp_length);
src_end = end_offset(src_err->oer_comp_offset,
src_err->oer_comp_length);
if (dest_end < src_end)
dest_end = src_end;
dest_err->oer_comp_length = dest_end - dest_err->oer_comp_offset;
if ((src_err->oer_iswrite == dest_err->oer_iswrite) &&
(err_prio(src_err->oer_errno) > err_prio(dest_err->oer_errno))) {
dest_err->oer_errno = src_err->oer_errno;
} else if (src_err->oer_iswrite) {
dest_err->oer_iswrite = true;
dest_err->oer_errno = src_err->oer_errno;
}
}
static void
encode_accumulated_error(struct objlayout *objlay, __be32 *p)
{
struct objlayout_io_res *oir, *tmp;
struct pnfs_osd_ioerr accumulated_err = {.oer_errno = 0};
list_for_each_entry_safe(oir, tmp, &objlay->err_list, err_list) {
unsigned i;
for (i = 0; i < oir->num_comps; i++) {
struct pnfs_osd_ioerr *ioerr = &oir->ioerrs[i];
if (!ioerr->oer_errno)
continue;
printk(KERN_ERR "NFS: %s: err[%d]: errno=%d "
"is_write=%d dev(%llx:%llx) par=0x%llx "
"obj=0x%llx offset=0x%llx length=0x%llx\n",
__func__, i, ioerr->oer_errno,
ioerr->oer_iswrite,
_DEVID_LO(&ioerr->oer_component.oid_device_id),
_DEVID_HI(&ioerr->oer_component.oid_device_id),
ioerr->oer_component.oid_partition_id,
ioerr->oer_component.oid_object_id,
ioerr->oer_comp_offset,
ioerr->oer_comp_length);
merge_ioerr(&accumulated_err, ioerr);
}
list_del(&oir->err_list);
objio_free_result(oir);
}
pnfs_osd_xdr_encode_ioerr(p, &accumulated_err);
}
void
objlayout_encode_layoutreturn(struct pnfs_layout_hdr *pnfslay,
struct xdr_stream *xdr,
const struct nfs4_layoutreturn_args *args)
{
struct objlayout *objlay = OBJLAYOUT(pnfslay);
struct objlayout_io_res *oir, *tmp;
__be32 *start;
dprintk("%s: Begin\n", __func__);
start = xdr_reserve_space(xdr, 4);
BUG_ON(!start);
spin_lock(&objlay->lock);
list_for_each_entry_safe(oir, tmp, &objlay->err_list, err_list) {
__be32 *last_xdr = NULL, *p;
unsigned i;
int res = 0;
for (i = 0; i < oir->num_comps; i++) {
struct pnfs_osd_ioerr *ioerr = &oir->ioerrs[i];
if (!ioerr->oer_errno)
continue;
dprintk("%s: err[%d]: errno=%d is_write=%d "
"dev(%llx:%llx) par=0x%llx obj=0x%llx "
"offset=0x%llx length=0x%llx\n",
__func__, i, ioerr->oer_errno,
ioerr->oer_iswrite,
_DEVID_LO(&ioerr->oer_component.oid_device_id),
_DEVID_HI(&ioerr->oer_component.oid_device_id),
ioerr->oer_component.oid_partition_id,
ioerr->oer_component.oid_object_id,
ioerr->oer_comp_offset,
ioerr->oer_comp_length);
p = pnfs_osd_xdr_ioerr_reserve_space(xdr);
if (unlikely(!p)) {
res = -E2BIG;
break; /* accumulated_error */
}
last_xdr = p;
pnfs_osd_xdr_encode_ioerr(p, &oir->ioerrs[i]);
}
/* TODO: use xdr_write_pages */
if (unlikely(res)) {
/* no space for even one error descriptor */
BUG_ON(!last_xdr);
/* we've encountered a situation with lots and lots of
* errors and no space to encode them all. Use the last
* available slot to report the union of all the
* remaining errors.
*/
encode_accumulated_error(objlay, last_xdr);
goto loop_done;
}
list_del(&oir->err_list);
objio_free_result(oir);
}
loop_done:
spin_unlock(&objlay->lock);
*start = cpu_to_be32((xdr->p - start - 1) * 4);
dprintk("%s: Return\n", __func__);
}
enum {
OBJLAYOUT_MAX_URI_LEN = 256, OBJLAYOUT_MAX_OSDNAME_LEN = 64,
OBJLAYOUT_MAX_SYSID_HEX_LEN = OSD_SYSTEMID_LEN * 2 + 1,
OSD_LOGIN_UPCALL_PATHLEN = 256
};
static char osd_login_prog[OSD_LOGIN_UPCALL_PATHLEN] = "/sbin/osd_login";
module_param_string(osd_login_prog, osd_login_prog, sizeof(osd_login_prog),
0600);
MODULE_PARM_DESC(osd_login_prog, "Path to the osd_login upcall program");
struct __auto_login {
char uri[OBJLAYOUT_MAX_URI_LEN];
char osdname[OBJLAYOUT_MAX_OSDNAME_LEN];
char systemid_hex[OBJLAYOUT_MAX_SYSID_HEX_LEN];
};
static int __objlayout_upcall(struct __auto_login *login)
{
static char *envp[] = { "HOME=/",
"TERM=linux",
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
NULL
};
char *argv[8];
int ret;
if (unlikely(!osd_login_prog[0])) {
dprintk("%s: osd_login_prog is disabled\n", __func__);
return -EACCES;
}
dprintk("%s uri: %s\n", __func__, login->uri);
dprintk("%s osdname %s\n", __func__, login->osdname);
dprintk("%s systemid_hex %s\n", __func__, login->systemid_hex);
argv[0] = (char *)osd_login_prog;
argv[1] = "-u";
argv[2] = login->uri;
argv[3] = "-o";
argv[4] = login->osdname;
argv[5] = "-s";
argv[6] = login->systemid_hex;
argv[7] = NULL;
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
/*
* Disable the upcall mechanism if we're getting an ENOENT or
* EACCES error. The admin can re-enable it on the fly by using
* sysfs to set the objlayoutdriver.osd_login_prog module parameter once
* the problem has been fixed.
*/
if (ret == -ENOENT || ret == -EACCES) {
printk(KERN_ERR "PNFS-OBJ: %s was not found please set "
"objlayoutdriver.osd_login_prog kernel parameter!\n",
osd_login_prog);
osd_login_prog[0] = '\0';
}
dprintk("%s %s return value: %d\n", __func__, osd_login_prog, ret);
return ret;
}
/* Assume dest is all zeros */
static void __copy_nfsS_and_zero_terminate(struct nfs4_string s,
char *dest, int max_len,
const char *var_name)
{
if (!s.len)
return;
if (s.len >= max_len) {
pr_warn_ratelimited(
"objlayout_autologin: %s: s.len(%d) >= max_len(%d)",
var_name, s.len, max_len);
s.len = max_len - 1; /* space for null terminator */
}
memcpy(dest, s.data, s.len);
}
/* Assume sysid is all zeros */
static void _sysid_2_hex(struct nfs4_string s,
char sysid[OBJLAYOUT_MAX_SYSID_HEX_LEN])
{
int i;
char *cur;
if (!s.len)
return;
if (s.len != OSD_SYSTEMID_LEN) {
pr_warn_ratelimited(
"objlayout_autologin: systemid_len(%d) != OSD_SYSTEMID_LEN",
s.len);
if (s.len > OSD_SYSTEMID_LEN)
s.len = OSD_SYSTEMID_LEN;
}
cur = sysid;
for (i = 0; i < s.len; i++)
cur = hex_byte_pack(cur, s.data[i]);
}
int objlayout_autologin(struct pnfs_osd_deviceaddr *deviceaddr)
{
int rc;
struct __auto_login login;
if (!deviceaddr->oda_targetaddr.ota_netaddr.r_addr.len)
return -ENODEV;
memset(&login, 0, sizeof(login));
__copy_nfsS_and_zero_terminate(
deviceaddr->oda_targetaddr.ota_netaddr.r_addr,
login.uri, sizeof(login.uri), "URI");
__copy_nfsS_and_zero_terminate(
deviceaddr->oda_osdname,
login.osdname, sizeof(login.osdname), "OSDNAME");
_sysid_2_hex(deviceaddr->oda_systemid, login.systemid_hex);
rc = __objlayout_upcall(&login);
if (rc > 0) /* script returns positive values */
rc = -ENODEV;
return rc;
}
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