mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
955 lines
25 KiB
C
955 lines
25 KiB
C
![]() |
/* vlocation.c: volume location management
|
||
|
*
|
||
|
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
|
||
|
* Written by David Howells (dhowells@redhat.com)
|
||
|
*
|
||
|
* This program is free software; you can redistribute it and/or
|
||
|
* modify it under the terms of the GNU General Public License
|
||
|
* as published by the Free Software Foundation; either version
|
||
|
* 2 of the License, or (at your option) any later version.
|
||
|
*/
|
||
|
|
||
|
#include <linux/kernel.h>
|
||
|
#include <linux/module.h>
|
||
|
#include <linux/init.h>
|
||
|
#include <linux/slab.h>
|
||
|
#include <linux/fs.h>
|
||
|
#include <linux/pagemap.h>
|
||
|
#include "volume.h"
|
||
|
#include "cell.h"
|
||
|
#include "cmservice.h"
|
||
|
#include "fsclient.h"
|
||
|
#include "vlclient.h"
|
||
|
#include "kafstimod.h"
|
||
|
#include <rxrpc/connection.h>
|
||
|
#include "internal.h"
|
||
|
|
||
|
#define AFS_VLDB_TIMEOUT HZ*1000
|
||
|
|
||
|
static void afs_vlocation_update_timer(struct afs_timer *timer);
|
||
|
static void afs_vlocation_update_attend(struct afs_async_op *op);
|
||
|
static void afs_vlocation_update_discard(struct afs_async_op *op);
|
||
|
static void __afs_put_vlocation(struct afs_vlocation *vlocation);
|
||
|
|
||
|
static void __afs_vlocation_timeout(struct afs_timer *timer)
|
||
|
{
|
||
|
struct afs_vlocation *vlocation =
|
||
|
list_entry(timer, struct afs_vlocation, timeout);
|
||
|
|
||
|
_debug("VL TIMEOUT [%s{u=%d}]",
|
||
|
vlocation->vldb.name, atomic_read(&vlocation->usage));
|
||
|
|
||
|
afs_vlocation_do_timeout(vlocation);
|
||
|
}
|
||
|
|
||
|
static const struct afs_timer_ops afs_vlocation_timer_ops = {
|
||
|
.timed_out = __afs_vlocation_timeout,
|
||
|
};
|
||
|
|
||
|
static const struct afs_timer_ops afs_vlocation_update_timer_ops = {
|
||
|
.timed_out = afs_vlocation_update_timer,
|
||
|
};
|
||
|
|
||
|
static const struct afs_async_op_ops afs_vlocation_update_op_ops = {
|
||
|
.attend = afs_vlocation_update_attend,
|
||
|
.discard = afs_vlocation_update_discard,
|
||
|
};
|
||
|
|
||
|
static LIST_HEAD(afs_vlocation_update_pendq); /* queue of VLs awaiting update */
|
||
|
static struct afs_vlocation *afs_vlocation_update; /* VL currently being updated */
|
||
|
static DEFINE_SPINLOCK(afs_vlocation_update_lock); /* lock guarding update queue */
|
||
|
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
static cachefs_match_val_t afs_vlocation_cache_match(void *target,
|
||
|
const void *entry);
|
||
|
static void afs_vlocation_cache_update(void *source, void *entry);
|
||
|
|
||
|
struct cachefs_index_def afs_vlocation_cache_index_def = {
|
||
|
.name = "vldb",
|
||
|
.data_size = sizeof(struct afs_cache_vlocation),
|
||
|
.keys[0] = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
|
||
|
.match = afs_vlocation_cache_match,
|
||
|
.update = afs_vlocation_cache_update,
|
||
|
};
|
||
|
#endif
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* iterate through the VL servers in a cell until one of them admits knowing
|
||
|
* about the volume in question
|
||
|
* - caller must have cell->vl_sem write-locked
|
||
|
*/
|
||
|
static int afs_vlocation_access_vl_by_name(struct afs_vlocation *vlocation,
|
||
|
const char *name,
|
||
|
unsigned namesz,
|
||
|
struct afs_cache_vlocation *vldb)
|
||
|
{
|
||
|
struct afs_server *server = NULL;
|
||
|
struct afs_cell *cell = vlocation->cell;
|
||
|
int count, ret;
|
||
|
|
||
|
_enter("%s,%*.*s,%u", cell->name, namesz, namesz, name, namesz);
|
||
|
|
||
|
ret = -ENOMEDIUM;
|
||
|
for (count = cell->vl_naddrs; count > 0; count--) {
|
||
|
_debug("CellServ[%hu]: %08x",
|
||
|
cell->vl_curr_svix,
|
||
|
cell->vl_addrs[cell->vl_curr_svix].s_addr);
|
||
|
|
||
|
/* try and create a server */
|
||
|
ret = afs_server_lookup(cell,
|
||
|
&cell->vl_addrs[cell->vl_curr_svix],
|
||
|
&server);
|
||
|
switch (ret) {
|
||
|
case 0:
|
||
|
break;
|
||
|
case -ENOMEM:
|
||
|
case -ENONET:
|
||
|
goto out;
|
||
|
default:
|
||
|
goto rotate;
|
||
|
}
|
||
|
|
||
|
/* attempt to access the VL server */
|
||
|
ret = afs_rxvl_get_entry_by_name(server, name, namesz, vldb);
|
||
|
switch (ret) {
|
||
|
case 0:
|
||
|
afs_put_server(server);
|
||
|
goto out;
|
||
|
case -ENOMEM:
|
||
|
case -ENONET:
|
||
|
case -ENETUNREACH:
|
||
|
case -EHOSTUNREACH:
|
||
|
case -ECONNREFUSED:
|
||
|
down_write(&server->sem);
|
||
|
if (server->vlserver) {
|
||
|
rxrpc_put_connection(server->vlserver);
|
||
|
server->vlserver = NULL;
|
||
|
}
|
||
|
up_write(&server->sem);
|
||
|
afs_put_server(server);
|
||
|
if (ret == -ENOMEM || ret == -ENONET)
|
||
|
goto out;
|
||
|
goto rotate;
|
||
|
case -ENOMEDIUM:
|
||
|
afs_put_server(server);
|
||
|
goto out;
|
||
|
default:
|
||
|
afs_put_server(server);
|
||
|
ret = -ENOMEDIUM;
|
||
|
goto rotate;
|
||
|
}
|
||
|
|
||
|
/* rotate the server records upon lookup failure */
|
||
|
rotate:
|
||
|
cell->vl_curr_svix++;
|
||
|
cell->vl_curr_svix %= cell->vl_naddrs;
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
_leave(" = %d", ret);
|
||
|
return ret;
|
||
|
|
||
|
} /* end afs_vlocation_access_vl_by_name() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* iterate through the VL servers in a cell until one of them admits knowing
|
||
|
* about the volume in question
|
||
|
* - caller must have cell->vl_sem write-locked
|
||
|
*/
|
||
|
static int afs_vlocation_access_vl_by_id(struct afs_vlocation *vlocation,
|
||
|
afs_volid_t volid,
|
||
|
afs_voltype_t voltype,
|
||
|
struct afs_cache_vlocation *vldb)
|
||
|
{
|
||
|
struct afs_server *server = NULL;
|
||
|
struct afs_cell *cell = vlocation->cell;
|
||
|
int count, ret;
|
||
|
|
||
|
_enter("%s,%x,%d,", cell->name, volid, voltype);
|
||
|
|
||
|
ret = -ENOMEDIUM;
|
||
|
for (count = cell->vl_naddrs; count > 0; count--) {
|
||
|
_debug("CellServ[%hu]: %08x",
|
||
|
cell->vl_curr_svix,
|
||
|
cell->vl_addrs[cell->vl_curr_svix].s_addr);
|
||
|
|
||
|
/* try and create a server */
|
||
|
ret = afs_server_lookup(cell,
|
||
|
&cell->vl_addrs[cell->vl_curr_svix],
|
||
|
&server);
|
||
|
switch (ret) {
|
||
|
case 0:
|
||
|
break;
|
||
|
case -ENOMEM:
|
||
|
case -ENONET:
|
||
|
goto out;
|
||
|
default:
|
||
|
goto rotate;
|
||
|
}
|
||
|
|
||
|
/* attempt to access the VL server */
|
||
|
ret = afs_rxvl_get_entry_by_id(server, volid, voltype, vldb);
|
||
|
switch (ret) {
|
||
|
case 0:
|
||
|
afs_put_server(server);
|
||
|
goto out;
|
||
|
case -ENOMEM:
|
||
|
case -ENONET:
|
||
|
case -ENETUNREACH:
|
||
|
case -EHOSTUNREACH:
|
||
|
case -ECONNREFUSED:
|
||
|
down_write(&server->sem);
|
||
|
if (server->vlserver) {
|
||
|
rxrpc_put_connection(server->vlserver);
|
||
|
server->vlserver = NULL;
|
||
|
}
|
||
|
up_write(&server->sem);
|
||
|
afs_put_server(server);
|
||
|
if (ret == -ENOMEM || ret == -ENONET)
|
||
|
goto out;
|
||
|
goto rotate;
|
||
|
case -ENOMEDIUM:
|
||
|
afs_put_server(server);
|
||
|
goto out;
|
||
|
default:
|
||
|
afs_put_server(server);
|
||
|
ret = -ENOMEDIUM;
|
||
|
goto rotate;
|
||
|
}
|
||
|
|
||
|
/* rotate the server records upon lookup failure */
|
||
|
rotate:
|
||
|
cell->vl_curr_svix++;
|
||
|
cell->vl_curr_svix %= cell->vl_naddrs;
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
_leave(" = %d", ret);
|
||
|
return ret;
|
||
|
|
||
|
} /* end afs_vlocation_access_vl_by_id() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* lookup volume location
|
||
|
* - caller must have cell->vol_sem write-locked
|
||
|
* - iterate through the VL servers in a cell until one of them admits knowing
|
||
|
* about the volume in question
|
||
|
* - lookup in the local cache if not able to find on the VL server
|
||
|
* - insert/update in the local cache if did get a VL response
|
||
|
*/
|
||
|
int afs_vlocation_lookup(struct afs_cell *cell,
|
||
|
const char *name,
|
||
|
unsigned namesz,
|
||
|
struct afs_vlocation **_vlocation)
|
||
|
{
|
||
|
struct afs_cache_vlocation vldb;
|
||
|
struct afs_vlocation *vlocation;
|
||
|
afs_voltype_t voltype;
|
||
|
afs_volid_t vid;
|
||
|
int active = 0, ret;
|
||
|
|
||
|
_enter("{%s},%*.*s,%u,", cell->name, namesz, namesz, name, namesz);
|
||
|
|
||
|
if (namesz > sizeof(vlocation->vldb.name)) {
|
||
|
_leave(" = -ENAMETOOLONG");
|
||
|
return -ENAMETOOLONG;
|
||
|
}
|
||
|
|
||
|
/* search the cell's active list first */
|
||
|
list_for_each_entry(vlocation, &cell->vl_list, link) {
|
||
|
if (namesz < sizeof(vlocation->vldb.name) &&
|
||
|
vlocation->vldb.name[namesz] != '\0')
|
||
|
continue;
|
||
|
|
||
|
if (memcmp(vlocation->vldb.name, name, namesz) == 0)
|
||
|
goto found_in_memory;
|
||
|
}
|
||
|
|
||
|
/* search the cell's graveyard list second */
|
||
|
spin_lock(&cell->vl_gylock);
|
||
|
list_for_each_entry(vlocation, &cell->vl_graveyard, link) {
|
||
|
if (namesz < sizeof(vlocation->vldb.name) &&
|
||
|
vlocation->vldb.name[namesz] != '\0')
|
||
|
continue;
|
||
|
|
||
|
if (memcmp(vlocation->vldb.name, name, namesz) == 0)
|
||
|
goto found_in_graveyard;
|
||
|
}
|
||
|
spin_unlock(&cell->vl_gylock);
|
||
|
|
||
|
/* not in the cell's in-memory lists - create a new record */
|
||
|
vlocation = kmalloc(sizeof(struct afs_vlocation), GFP_KERNEL);
|
||
|
if (!vlocation)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
memset(vlocation, 0, sizeof(struct afs_vlocation));
|
||
|
atomic_set(&vlocation->usage, 1);
|
||
|
INIT_LIST_HEAD(&vlocation->link);
|
||
|
rwlock_init(&vlocation->lock);
|
||
|
memcpy(vlocation->vldb.name, name, namesz);
|
||
|
|
||
|
afs_timer_init(&vlocation->timeout, &afs_vlocation_timer_ops);
|
||
|
afs_timer_init(&vlocation->upd_timer, &afs_vlocation_update_timer_ops);
|
||
|
afs_async_op_init(&vlocation->upd_op, &afs_vlocation_update_op_ops);
|
||
|
|
||
|
afs_get_cell(cell);
|
||
|
vlocation->cell = cell;
|
||
|
|
||
|
list_add_tail(&vlocation->link, &cell->vl_list);
|
||
|
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
/* we want to store it in the cache, plus it might already be
|
||
|
* encached */
|
||
|
cachefs_acquire_cookie(cell->cache,
|
||
|
&afs_volume_cache_index_def,
|
||
|
vlocation,
|
||
|
&vlocation->cache);
|
||
|
|
||
|
if (vlocation->valid)
|
||
|
goto found_in_cache;
|
||
|
#endif
|
||
|
|
||
|
/* try to look up an unknown volume in the cell VL databases by name */
|
||
|
ret = afs_vlocation_access_vl_by_name(vlocation, name, namesz, &vldb);
|
||
|
if (ret < 0) {
|
||
|
printk("kAFS: failed to locate '%*.*s' in cell '%s'\n",
|
||
|
namesz, namesz, name, cell->name);
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
goto found_on_vlserver;
|
||
|
|
||
|
found_in_graveyard:
|
||
|
/* found in the graveyard - resurrect */
|
||
|
_debug("found in graveyard");
|
||
|
atomic_inc(&vlocation->usage);
|
||
|
list_del(&vlocation->link);
|
||
|
list_add_tail(&vlocation->link, &cell->vl_list);
|
||
|
spin_unlock(&cell->vl_gylock);
|
||
|
|
||
|
afs_kafstimod_del_timer(&vlocation->timeout);
|
||
|
goto active;
|
||
|
|
||
|
found_in_memory:
|
||
|
/* found in memory - check to see if it's active */
|
||
|
_debug("found in memory");
|
||
|
atomic_inc(&vlocation->usage);
|
||
|
|
||
|
active:
|
||
|
active = 1;
|
||
|
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
found_in_cache:
|
||
|
#endif
|
||
|
/* try to look up a cached volume in the cell VL databases by ID */
|
||
|
_debug("found in cache");
|
||
|
|
||
|
_debug("Locally Cached: %s %02x { %08x(%x) %08x(%x) %08x(%x) }",
|
||
|
vlocation->vldb.name,
|
||
|
vlocation->vldb.vidmask,
|
||
|
ntohl(vlocation->vldb.servers[0].s_addr),
|
||
|
vlocation->vldb.srvtmask[0],
|
||
|
ntohl(vlocation->vldb.servers[1].s_addr),
|
||
|
vlocation->vldb.srvtmask[1],
|
||
|
ntohl(vlocation->vldb.servers[2].s_addr),
|
||
|
vlocation->vldb.srvtmask[2]
|
||
|
);
|
||
|
|
||
|
_debug("Vids: %08x %08x %08x",
|
||
|
vlocation->vldb.vid[0],
|
||
|
vlocation->vldb.vid[1],
|
||
|
vlocation->vldb.vid[2]);
|
||
|
|
||
|
if (vlocation->vldb.vidmask & AFS_VOL_VTM_RW) {
|
||
|
vid = vlocation->vldb.vid[0];
|
||
|
voltype = AFSVL_RWVOL;
|
||
|
}
|
||
|
else if (vlocation->vldb.vidmask & AFS_VOL_VTM_RO) {
|
||
|
vid = vlocation->vldb.vid[1];
|
||
|
voltype = AFSVL_ROVOL;
|
||
|
}
|
||
|
else if (vlocation->vldb.vidmask & AFS_VOL_VTM_BAK) {
|
||
|
vid = vlocation->vldb.vid[2];
|
||
|
voltype = AFSVL_BACKVOL;
|
||
|
}
|
||
|
else {
|
||
|
BUG();
|
||
|
vid = 0;
|
||
|
voltype = 0;
|
||
|
}
|
||
|
|
||
|
ret = afs_vlocation_access_vl_by_id(vlocation, vid, voltype, &vldb);
|
||
|
switch (ret) {
|
||
|
/* net error */
|
||
|
default:
|
||
|
printk("kAFS: failed to volume '%*.*s' (%x) up in '%s': %d\n",
|
||
|
namesz, namesz, name, vid, cell->name, ret);
|
||
|
goto error;
|
||
|
|
||
|
/* pulled from local cache into memory */
|
||
|
case 0:
|
||
|
goto found_on_vlserver;
|
||
|
|
||
|
/* uh oh... looks like the volume got deleted */
|
||
|
case -ENOMEDIUM:
|
||
|
printk("kAFS: volume '%*.*s' (%x) does not exist '%s'\n",
|
||
|
namesz, namesz, name, vid, cell->name);
|
||
|
|
||
|
/* TODO: make existing record unavailable */
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
found_on_vlserver:
|
||
|
_debug("Done VL Lookup: %*.*s %02x { %08x(%x) %08x(%x) %08x(%x) }",
|
||
|
namesz, namesz, name,
|
||
|
vldb.vidmask,
|
||
|
ntohl(vldb.servers[0].s_addr), vldb.srvtmask[0],
|
||
|
ntohl(vldb.servers[1].s_addr), vldb.srvtmask[1],
|
||
|
ntohl(vldb.servers[2].s_addr), vldb.srvtmask[2]
|
||
|
);
|
||
|
|
||
|
_debug("Vids: %08x %08x %08x", vldb.vid[0], vldb.vid[1], vldb.vid[2]);
|
||
|
|
||
|
if ((namesz < sizeof(vlocation->vldb.name) &&
|
||
|
vlocation->vldb.name[namesz] != '\0') ||
|
||
|
memcmp(vldb.name, name, namesz) != 0)
|
||
|
printk("kAFS: name of volume '%*.*s' changed to '%s' on server\n",
|
||
|
namesz, namesz, name, vldb.name);
|
||
|
|
||
|
memcpy(&vlocation->vldb, &vldb, sizeof(vlocation->vldb));
|
||
|
|
||
|
afs_kafstimod_add_timer(&vlocation->upd_timer, 10 * HZ);
|
||
|
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
/* update volume entry in local cache */
|
||
|
cachefs_update_cookie(vlocation->cache);
|
||
|
#endif
|
||
|
|
||
|
*_vlocation = vlocation;
|
||
|
_leave(" = 0 (%p)",vlocation);
|
||
|
return 0;
|
||
|
|
||
|
error:
|
||
|
if (vlocation) {
|
||
|
if (active) {
|
||
|
__afs_put_vlocation(vlocation);
|
||
|
}
|
||
|
else {
|
||
|
list_del(&vlocation->link);
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
cachefs_relinquish_cookie(vlocation->cache, 0);
|
||
|
#endif
|
||
|
afs_put_cell(vlocation->cell);
|
||
|
kfree(vlocation);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
_leave(" = %d", ret);
|
||
|
return ret;
|
||
|
} /* end afs_vlocation_lookup() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* finish using a volume location record
|
||
|
* - caller must have cell->vol_sem write-locked
|
||
|
*/
|
||
|
static void __afs_put_vlocation(struct afs_vlocation *vlocation)
|
||
|
{
|
||
|
struct afs_cell *cell;
|
||
|
|
||
|
if (!vlocation)
|
||
|
return;
|
||
|
|
||
|
_enter("%s", vlocation->vldb.name);
|
||
|
|
||
|
cell = vlocation->cell;
|
||
|
|
||
|
/* sanity check */
|
||
|
BUG_ON(atomic_read(&vlocation->usage) <= 0);
|
||
|
|
||
|
spin_lock(&cell->vl_gylock);
|
||
|
if (likely(!atomic_dec_and_test(&vlocation->usage))) {
|
||
|
spin_unlock(&cell->vl_gylock);
|
||
|
_leave("");
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/* move to graveyard queue */
|
||
|
list_del(&vlocation->link);
|
||
|
list_add_tail(&vlocation->link,&cell->vl_graveyard);
|
||
|
|
||
|
/* remove from pending timeout queue (refcounted if actually being
|
||
|
* updated) */
|
||
|
list_del_init(&vlocation->upd_op.link);
|
||
|
|
||
|
/* time out in 10 secs */
|
||
|
afs_kafstimod_del_timer(&vlocation->upd_timer);
|
||
|
afs_kafstimod_add_timer(&vlocation->timeout, 10 * HZ);
|
||
|
|
||
|
spin_unlock(&cell->vl_gylock);
|
||
|
|
||
|
_leave(" [killed]");
|
||
|
} /* end __afs_put_vlocation() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* finish using a volume location record
|
||
|
*/
|
||
|
void afs_put_vlocation(struct afs_vlocation *vlocation)
|
||
|
{
|
||
|
if (vlocation) {
|
||
|
struct afs_cell *cell = vlocation->cell;
|
||
|
|
||
|
down_write(&cell->vl_sem);
|
||
|
__afs_put_vlocation(vlocation);
|
||
|
up_write(&cell->vl_sem);
|
||
|
}
|
||
|
} /* end afs_put_vlocation() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* timeout vlocation record
|
||
|
* - removes from the cell's graveyard if the usage count is zero
|
||
|
*/
|
||
|
void afs_vlocation_do_timeout(struct afs_vlocation *vlocation)
|
||
|
{
|
||
|
struct afs_cell *cell;
|
||
|
|
||
|
_enter("%s", vlocation->vldb.name);
|
||
|
|
||
|
cell = vlocation->cell;
|
||
|
|
||
|
BUG_ON(atomic_read(&vlocation->usage) < 0);
|
||
|
|
||
|
/* remove from graveyard if still dead */
|
||
|
spin_lock(&cell->vl_gylock);
|
||
|
if (atomic_read(&vlocation->usage) == 0)
|
||
|
list_del_init(&vlocation->link);
|
||
|
else
|
||
|
vlocation = NULL;
|
||
|
spin_unlock(&cell->vl_gylock);
|
||
|
|
||
|
if (!vlocation) {
|
||
|
_leave("");
|
||
|
return; /* resurrected */
|
||
|
}
|
||
|
|
||
|
/* we can now destroy it properly */
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
cachefs_relinquish_cookie(vlocation->cache, 0);
|
||
|
#endif
|
||
|
afs_put_cell(cell);
|
||
|
|
||
|
kfree(vlocation);
|
||
|
|
||
|
_leave(" [destroyed]");
|
||
|
} /* end afs_vlocation_do_timeout() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* send an update operation to the currently selected server
|
||
|
*/
|
||
|
static int afs_vlocation_update_begin(struct afs_vlocation *vlocation)
|
||
|
{
|
||
|
afs_voltype_t voltype;
|
||
|
afs_volid_t vid;
|
||
|
int ret;
|
||
|
|
||
|
_enter("%s{ufs=%u ucs=%u}",
|
||
|
vlocation->vldb.name,
|
||
|
vlocation->upd_first_svix,
|
||
|
vlocation->upd_curr_svix);
|
||
|
|
||
|
/* try to look up a cached volume in the cell VL databases by ID */
|
||
|
if (vlocation->vldb.vidmask & AFS_VOL_VTM_RW) {
|
||
|
vid = vlocation->vldb.vid[0];
|
||
|
voltype = AFSVL_RWVOL;
|
||
|
}
|
||
|
else if (vlocation->vldb.vidmask & AFS_VOL_VTM_RO) {
|
||
|
vid = vlocation->vldb.vid[1];
|
||
|
voltype = AFSVL_ROVOL;
|
||
|
}
|
||
|
else if (vlocation->vldb.vidmask & AFS_VOL_VTM_BAK) {
|
||
|
vid = vlocation->vldb.vid[2];
|
||
|
voltype = AFSVL_BACKVOL;
|
||
|
}
|
||
|
else {
|
||
|
BUG();
|
||
|
vid = 0;
|
||
|
voltype = 0;
|
||
|
}
|
||
|
|
||
|
/* contact the chosen server */
|
||
|
ret = afs_server_lookup(
|
||
|
vlocation->cell,
|
||
|
&vlocation->cell->vl_addrs[vlocation->upd_curr_svix],
|
||
|
&vlocation->upd_op.server);
|
||
|
|
||
|
switch (ret) {
|
||
|
case 0:
|
||
|
break;
|
||
|
case -ENOMEM:
|
||
|
case -ENONET:
|
||
|
default:
|
||
|
_leave(" = %d", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* initiate the update operation */
|
||
|
ret = afs_rxvl_get_entry_by_id_async(&vlocation->upd_op, vid, voltype);
|
||
|
if (ret < 0) {
|
||
|
_leave(" = %d", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
_leave(" = %d", ret);
|
||
|
return ret;
|
||
|
} /* end afs_vlocation_update_begin() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* abandon updating a VL record
|
||
|
* - does not restart the update timer
|
||
|
*/
|
||
|
static void afs_vlocation_update_abandon(struct afs_vlocation *vlocation,
|
||
|
afs_vlocation_upd_t state,
|
||
|
int ret)
|
||
|
{
|
||
|
_enter("%s,%u", vlocation->vldb.name, state);
|
||
|
|
||
|
if (ret < 0)
|
||
|
printk("kAFS: Abandoning VL update '%s': %d\n",
|
||
|
vlocation->vldb.name, ret);
|
||
|
|
||
|
/* discard the server record */
|
||
|
afs_put_server(vlocation->upd_op.server);
|
||
|
vlocation->upd_op.server = NULL;
|
||
|
|
||
|
spin_lock(&afs_vlocation_update_lock);
|
||
|
afs_vlocation_update = NULL;
|
||
|
vlocation->upd_state = state;
|
||
|
|
||
|
/* TODO: start updating next VL record on pending list */
|
||
|
|
||
|
spin_unlock(&afs_vlocation_update_lock);
|
||
|
|
||
|
_leave("");
|
||
|
} /* end afs_vlocation_update_abandon() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* handle periodic update timeouts and busy retry timeouts
|
||
|
* - called from kafstimod
|
||
|
*/
|
||
|
static void afs_vlocation_update_timer(struct afs_timer *timer)
|
||
|
{
|
||
|
struct afs_vlocation *vlocation =
|
||
|
list_entry(timer, struct afs_vlocation, upd_timer);
|
||
|
int ret;
|
||
|
|
||
|
_enter("%s", vlocation->vldb.name);
|
||
|
|
||
|
/* only update if not in the graveyard (defend against putting too) */
|
||
|
spin_lock(&vlocation->cell->vl_gylock);
|
||
|
|
||
|
if (!atomic_read(&vlocation->usage))
|
||
|
goto out_unlock1;
|
||
|
|
||
|
spin_lock(&afs_vlocation_update_lock);
|
||
|
|
||
|
/* if we were woken up due to EBUSY sleep then restart immediately if
|
||
|
* possible or else jump to front of pending queue */
|
||
|
if (vlocation->upd_state == AFS_VLUPD_BUSYSLEEP) {
|
||
|
if (afs_vlocation_update) {
|
||
|
list_add(&vlocation->upd_op.link,
|
||
|
&afs_vlocation_update_pendq);
|
||
|
}
|
||
|
else {
|
||
|
afs_get_vlocation(vlocation);
|
||
|
afs_vlocation_update = vlocation;
|
||
|
vlocation->upd_state = AFS_VLUPD_INPROGRESS;
|
||
|
}
|
||
|
goto out_unlock2;
|
||
|
}
|
||
|
|
||
|
/* put on pending queue if there's already another update in progress */
|
||
|
if (afs_vlocation_update) {
|
||
|
vlocation->upd_state = AFS_VLUPD_PENDING;
|
||
|
list_add_tail(&vlocation->upd_op.link,
|
||
|
&afs_vlocation_update_pendq);
|
||
|
goto out_unlock2;
|
||
|
}
|
||
|
|
||
|
/* hold a ref on it while actually updating */
|
||
|
afs_get_vlocation(vlocation);
|
||
|
afs_vlocation_update = vlocation;
|
||
|
vlocation->upd_state = AFS_VLUPD_INPROGRESS;
|
||
|
|
||
|
spin_unlock(&afs_vlocation_update_lock);
|
||
|
spin_unlock(&vlocation->cell->vl_gylock);
|
||
|
|
||
|
/* okay... we can start the update */
|
||
|
_debug("BEGIN VL UPDATE [%s]", vlocation->vldb.name);
|
||
|
vlocation->upd_first_svix = vlocation->cell->vl_curr_svix;
|
||
|
vlocation->upd_curr_svix = vlocation->upd_first_svix;
|
||
|
vlocation->upd_rej_cnt = 0;
|
||
|
vlocation->upd_busy_cnt = 0;
|
||
|
|
||
|
ret = afs_vlocation_update_begin(vlocation);
|
||
|
if (ret < 0) {
|
||
|
afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, ret);
|
||
|
afs_kafstimod_add_timer(&vlocation->upd_timer,
|
||
|
AFS_VLDB_TIMEOUT);
|
||
|
afs_put_vlocation(vlocation);
|
||
|
}
|
||
|
|
||
|
_leave("");
|
||
|
return;
|
||
|
|
||
|
out_unlock2:
|
||
|
spin_unlock(&afs_vlocation_update_lock);
|
||
|
out_unlock1:
|
||
|
spin_unlock(&vlocation->cell->vl_gylock);
|
||
|
_leave("");
|
||
|
return;
|
||
|
|
||
|
} /* end afs_vlocation_update_timer() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* attend to an update operation upon which an event happened
|
||
|
* - called in kafsasyncd context
|
||
|
*/
|
||
|
static void afs_vlocation_update_attend(struct afs_async_op *op)
|
||
|
{
|
||
|
struct afs_cache_vlocation vldb;
|
||
|
struct afs_vlocation *vlocation =
|
||
|
list_entry(op, struct afs_vlocation, upd_op);
|
||
|
unsigned tmp;
|
||
|
int ret;
|
||
|
|
||
|
_enter("%s", vlocation->vldb.name);
|
||
|
|
||
|
ret = afs_rxvl_get_entry_by_id_async2(op, &vldb);
|
||
|
switch (ret) {
|
||
|
case -EAGAIN:
|
||
|
_leave(" [unfinished]");
|
||
|
return;
|
||
|
|
||
|
case 0:
|
||
|
_debug("END VL UPDATE: %d\n", ret);
|
||
|
vlocation->valid = 1;
|
||
|
|
||
|
_debug("Done VL Lookup: %02x { %08x(%x) %08x(%x) %08x(%x) }",
|
||
|
vldb.vidmask,
|
||
|
ntohl(vldb.servers[0].s_addr), vldb.srvtmask[0],
|
||
|
ntohl(vldb.servers[1].s_addr), vldb.srvtmask[1],
|
||
|
ntohl(vldb.servers[2].s_addr), vldb.srvtmask[2]
|
||
|
);
|
||
|
|
||
|
_debug("Vids: %08x %08x %08x",
|
||
|
vldb.vid[0], vldb.vid[1], vldb.vid[2]);
|
||
|
|
||
|
afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, 0);
|
||
|
|
||
|
down_write(&vlocation->cell->vl_sem);
|
||
|
|
||
|
/* actually update the cache */
|
||
|
if (strncmp(vldb.name, vlocation->vldb.name,
|
||
|
sizeof(vlocation->vldb.name)) != 0)
|
||
|
printk("kAFS: name of volume '%s'"
|
||
|
" changed to '%s' on server\n",
|
||
|
vlocation->vldb.name, vldb.name);
|
||
|
|
||
|
memcpy(&vlocation->vldb, &vldb, sizeof(vlocation->vldb));
|
||
|
|
||
|
#if 0
|
||
|
/* TODO update volume entry in local cache */
|
||
|
#endif
|
||
|
|
||
|
up_write(&vlocation->cell->vl_sem);
|
||
|
|
||
|
if (ret < 0)
|
||
|
printk("kAFS: failed to update local cache: %d\n", ret);
|
||
|
|
||
|
afs_kafstimod_add_timer(&vlocation->upd_timer,
|
||
|
AFS_VLDB_TIMEOUT);
|
||
|
afs_put_vlocation(vlocation);
|
||
|
_leave(" [found]");
|
||
|
return;
|
||
|
|
||
|
case -ENOMEDIUM:
|
||
|
vlocation->upd_rej_cnt++;
|
||
|
goto try_next;
|
||
|
|
||
|
/* the server is locked - retry in a very short while */
|
||
|
case -EBUSY:
|
||
|
vlocation->upd_busy_cnt++;
|
||
|
if (vlocation->upd_busy_cnt > 3)
|
||
|
goto try_next; /* too many retries */
|
||
|
|
||
|
afs_vlocation_update_abandon(vlocation,
|
||
|
AFS_VLUPD_BUSYSLEEP, 0);
|
||
|
afs_kafstimod_add_timer(&vlocation->upd_timer, HZ / 2);
|
||
|
afs_put_vlocation(vlocation);
|
||
|
_leave(" [busy]");
|
||
|
return;
|
||
|
|
||
|
case -ENETUNREACH:
|
||
|
case -EHOSTUNREACH:
|
||
|
case -ECONNREFUSED:
|
||
|
case -EREMOTEIO:
|
||
|
/* record bad vlserver info in the cell too
|
||
|
* - TODO: use down_write_trylock() if available
|
||
|
*/
|
||
|
if (vlocation->upd_curr_svix == vlocation->cell->vl_curr_svix)
|
||
|
vlocation->cell->vl_curr_svix =
|
||
|
vlocation->cell->vl_curr_svix %
|
||
|
vlocation->cell->vl_naddrs;
|
||
|
|
||
|
case -EBADRQC:
|
||
|
case -EINVAL:
|
||
|
case -EACCES:
|
||
|
case -EBADMSG:
|
||
|
goto try_next;
|
||
|
|
||
|
default:
|
||
|
goto abandon;
|
||
|
}
|
||
|
|
||
|
/* try contacting the next server */
|
||
|
try_next:
|
||
|
vlocation->upd_busy_cnt = 0;
|
||
|
|
||
|
/* discard the server record */
|
||
|
afs_put_server(vlocation->upd_op.server);
|
||
|
vlocation->upd_op.server = NULL;
|
||
|
|
||
|
tmp = vlocation->cell->vl_naddrs;
|
||
|
if (tmp == 0)
|
||
|
goto abandon;
|
||
|
|
||
|
vlocation->upd_curr_svix++;
|
||
|
if (vlocation->upd_curr_svix >= tmp)
|
||
|
vlocation->upd_curr_svix = 0;
|
||
|
if (vlocation->upd_first_svix >= tmp)
|
||
|
vlocation->upd_first_svix = tmp - 1;
|
||
|
|
||
|
/* move to the next server */
|
||
|
if (vlocation->upd_curr_svix != vlocation->upd_first_svix) {
|
||
|
afs_vlocation_update_begin(vlocation);
|
||
|
_leave(" [next]");
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/* run out of servers to try - was the volume rejected? */
|
||
|
if (vlocation->upd_rej_cnt > 0) {
|
||
|
printk("kAFS: Active volume no longer valid '%s'\n",
|
||
|
vlocation->vldb.name);
|
||
|
vlocation->valid = 0;
|
||
|
afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, 0);
|
||
|
afs_kafstimod_add_timer(&vlocation->upd_timer,
|
||
|
AFS_VLDB_TIMEOUT);
|
||
|
afs_put_vlocation(vlocation);
|
||
|
_leave(" [invalidated]");
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/* abandon the update */
|
||
|
abandon:
|
||
|
afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, ret);
|
||
|
afs_kafstimod_add_timer(&vlocation->upd_timer, HZ * 10);
|
||
|
afs_put_vlocation(vlocation);
|
||
|
_leave(" [abandoned]");
|
||
|
|
||
|
} /* end afs_vlocation_update_attend() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* deal with an update operation being discarded
|
||
|
* - called in kafsasyncd context when it's dying due to rmmod
|
||
|
* - the call has already been aborted and put()'d
|
||
|
*/
|
||
|
static void afs_vlocation_update_discard(struct afs_async_op *op)
|
||
|
{
|
||
|
struct afs_vlocation *vlocation =
|
||
|
list_entry(op, struct afs_vlocation, upd_op);
|
||
|
|
||
|
_enter("%s", vlocation->vldb.name);
|
||
|
|
||
|
afs_put_server(op->server);
|
||
|
op->server = NULL;
|
||
|
|
||
|
afs_put_vlocation(vlocation);
|
||
|
|
||
|
_leave("");
|
||
|
} /* end afs_vlocation_update_discard() */
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* match a VLDB record stored in the cache
|
||
|
* - may also load target from entry
|
||
|
*/
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
static cachefs_match_val_t afs_vlocation_cache_match(void *target,
|
||
|
const void *entry)
|
||
|
{
|
||
|
const struct afs_cache_vlocation *vldb = entry;
|
||
|
struct afs_vlocation *vlocation = target;
|
||
|
|
||
|
_enter("{%s},{%s}", vlocation->vldb.name, vldb->name);
|
||
|
|
||
|
if (strncmp(vlocation->vldb.name, vldb->name, sizeof(vldb->name)) == 0
|
||
|
) {
|
||
|
if (!vlocation->valid ||
|
||
|
vlocation->vldb.rtime == vldb->rtime
|
||
|
) {
|
||
|
vlocation->vldb = *vldb;
|
||
|
vlocation->valid = 1;
|
||
|
_leave(" = SUCCESS [c->m]");
|
||
|
return CACHEFS_MATCH_SUCCESS;
|
||
|
}
|
||
|
/* need to update cache if cached info differs */
|
||
|
else if (memcmp(&vlocation->vldb, vldb, sizeof(*vldb)) != 0) {
|
||
|
/* delete if VIDs for this name differ */
|
||
|
if (memcmp(&vlocation->vldb.vid,
|
||
|
&vldb->vid,
|
||
|
sizeof(vldb->vid)) != 0) {
|
||
|
_leave(" = DELETE");
|
||
|
return CACHEFS_MATCH_SUCCESS_DELETE;
|
||
|
}
|
||
|
|
||
|
_leave(" = UPDATE");
|
||
|
return CACHEFS_MATCH_SUCCESS_UPDATE;
|
||
|
}
|
||
|
else {
|
||
|
_leave(" = SUCCESS");
|
||
|
return CACHEFS_MATCH_SUCCESS;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
_leave(" = FAILED");
|
||
|
return CACHEFS_MATCH_FAILED;
|
||
|
} /* end afs_vlocation_cache_match() */
|
||
|
#endif
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/*
|
||
|
* update a VLDB record stored in the cache
|
||
|
*/
|
||
|
#ifdef AFS_CACHING_SUPPORT
|
||
|
static void afs_vlocation_cache_update(void *source, void *entry)
|
||
|
{
|
||
|
struct afs_cache_vlocation *vldb = entry;
|
||
|
struct afs_vlocation *vlocation = source;
|
||
|
|
||
|
_enter("");
|
||
|
|
||
|
*vldb = vlocation->vldb;
|
||
|
|
||
|
} /* end afs_vlocation_cache_update() */
|
||
|
#endif
|