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-rw-r--r--fs/afs/volume.c141
1 files changed, 49 insertions, 92 deletions
diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index c82e1bb..45491cf 100644
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -1,6 +1,6 @@
/* AFS volume management
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -15,33 +15,9 @@
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include "volume.h"
-#include "vnode.h"
-#include "cell.h"
-#include "cache.h"
-#include "cmservice.h"
-#include "fsclient.h"
-#include "vlclient.h"
#include "internal.h"
-#ifdef __KDEBUG
static const char *afs_voltypes[] = { "R/W", "R/O", "BAK" };
-#endif
-
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_volume_cache_match(void *target,
- const void *entry);
-static void afs_volume_cache_update(void *source, void *entry);
-
-struct cachefs_index_def afs_volume_cache_index_def = {
- .name = "volume",
- .data_size = sizeof(struct afs_cache_vhash),
- .keys[0] = { CACHEFS_INDEX_KEYS_BIN, 1 },
- .keys[1] = { CACHEFS_INDEX_KEYS_BIN, 1 },
- .match = afs_volume_cache_match,
- .update = afs_volume_cache_update,
-};
-#endif
/*
* lookup a volume by name
@@ -65,11 +41,12 @@ struct cachefs_index_def afs_volume_cache_index_def = {
* - Rule 3: If parent volume is R/W, then only mount R/W volume unless
* explicitly told otherwise
*/
-int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
- struct afs_volume **_volume)
+struct afs_volume *afs_volume_lookup(const char *name, struct afs_cell *cell,
+ int rwpath)
{
struct afs_vlocation *vlocation = NULL;
struct afs_volume *volume = NULL;
+ struct afs_server *server = NULL;
afs_voltype_t type;
const char *cellname, *volname, *suffix;
char srvtmask;
@@ -79,7 +56,7 @@ int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
if (!name || (name[0] != '%' && name[0] != '#') || !name[1]) {
printk("kAFS: unparsable volume name\n");
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}
/* determine the type of volume we're looking for */
@@ -128,8 +105,9 @@ int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
/* lookup the cell record */
if (cellname || !cell) {
- ret = afs_cell_lookup(cellname, cellnamesz, &cell);
- if (ret<0) {
+ cell = afs_cell_lookup(cellname, cellnamesz);
+ if (IS_ERR(cell)) {
+ ret = PTR_ERR(cell);
printk("kAFS: unable to lookup cell '%s'\n",
cellname ?: "");
goto error;
@@ -139,9 +117,12 @@ int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
}
/* lookup the volume location record */
- ret = afs_vlocation_lookup(cell, volname, volnamesz, &vlocation);
- if (ret < 0)
+ vlocation = afs_vlocation_lookup(cell, volname, volnamesz);
+ if (IS_ERR(vlocation)) {
+ ret = PTR_ERR(vlocation);
+ vlocation = NULL;
goto error;
+ }
/* make the final decision on the type we want */
ret = -ENOMEDIUM;
@@ -192,13 +173,14 @@ int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
/* look up all the applicable server records */
for (loop = 0; loop < 8; loop++) {
if (vlocation->vldb.srvtmask[loop] & (1 << volume->type)) {
- ret = afs_server_lookup(
- volume->cell,
- &vlocation->vldb.servers[loop],
- &volume->servers[volume->nservers]);
- if (ret < 0)
+ server = afs_lookup_server(
+ volume->cell, &vlocation->vldb.servers[loop]);
+ if (IS_ERR(server)) {
+ ret = PTR_ERR(server);
goto error_discard;
+ }
+ volume->servers[volume->nservers] = server;
volume->nservers++;
}
}
@@ -219,8 +201,11 @@ int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
success:
_debug("kAFS selected %s volume %08x",
afs_voltypes[volume->type], volume->vid);
- *_volume = volume;
- ret = 0;
+ up_write(&cell->vl_sem);
+ afs_put_vlocation(vlocation);
+ afs_put_cell(cell);
+ _leave(" = %p", volume);
+ return volume;
/* clean up */
error_up:
@@ -228,9 +213,8 @@ error_up:
error:
afs_put_vlocation(vlocation);
afs_put_cell(cell);
-
- _leave(" = %d (%p)", ret, volume);
- return ret;
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
error_discard:
up_write(&cell->vl_sem);
@@ -255,10 +239,9 @@ void afs_put_volume(struct afs_volume *volume)
_enter("%p", volume);
- vlocation = volume->vlocation;
+ ASSERTCMP(atomic_read(&volume->usage), >, 0);
- /* sanity check */
- BUG_ON(atomic_read(&volume->usage) <= 0);
+ vlocation = volume->vlocation;
/* to prevent a race, the decrement and the dequeue must be effectively
* atomic */
@@ -292,14 +275,21 @@ void afs_put_volume(struct afs_volume *volume)
* pick a server to use to try accessing this volume
* - returns with an elevated usage count on the server chosen
*/
-int afs_volume_pick_fileserver(struct afs_volume *volume,
- struct afs_server **_server)
+struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *vnode)
{
+ struct afs_volume *volume = vnode->volume;
struct afs_server *server;
int ret, state, loop;
_enter("%s", volume->vlocation->vldb.name);
+ /* stick with the server we're already using if we can */
+ if (vnode->server && vnode->server->fs_state == 0) {
+ afs_get_server(vnode->server);
+ _leave(" = %p [current]", vnode->server);
+ return vnode->server;
+ }
+
down_read(&volume->server_sem);
/* handle the no-server case */
@@ -307,7 +297,7 @@ int afs_volume_pick_fileserver(struct afs_volume *volume,
ret = volume->rjservers ? -ENOMEDIUM : -ESTALE;
up_read(&volume->server_sem);
_leave(" = %d [no servers]", ret);
- return ret;
+ return ERR_PTR(ret);
}
/* basically, just search the list for the first live server and use
@@ -317,15 +307,16 @@ int afs_volume_pick_fileserver(struct afs_volume *volume,
server = volume->servers[loop];
state = server->fs_state;
+ _debug("consider %d [%d]", loop, state);
+
switch (state) {
/* found an apparently healthy server */
case 0:
afs_get_server(server);
up_read(&volume->server_sem);
- *_server = server;
- _leave(" = 0 (picked %08x)",
- ntohl(server->addr.s_addr));
- return 0;
+ _leave(" = %p (picked %08x)",
+ server, ntohl(server->addr.s_addr));
+ return server;
case -ENETUNREACH:
if (ret == 0)
@@ -361,7 +352,7 @@ int afs_volume_pick_fileserver(struct afs_volume *volume,
*/
up_read(&volume->server_sem);
_leave(" = %d", ret);
- return ret;
+ return ERR_PTR(ret);
}
/*
@@ -370,10 +361,11 @@ int afs_volume_pick_fileserver(struct afs_volume *volume,
* - records result of using a particular server to access a volume
* - return 0 to try again, 1 if okay or to issue error
*/
-int afs_volume_release_fileserver(struct afs_volume *volume,
+int afs_volume_release_fileserver(struct afs_vnode *vnode,
struct afs_server *server,
int result)
{
+ struct afs_volume *volume = vnode->volume;
unsigned loop;
_enter("%s,%08x,%d",
@@ -384,6 +376,7 @@ int afs_volume_release_fileserver(struct afs_volume *volume,
/* success */
case 0:
server->fs_act_jif = jiffies;
+ server->fs_state = 0;
break;
/* the fileserver denied all knowledge of the volume */
@@ -391,7 +384,7 @@ int afs_volume_release_fileserver(struct afs_volume *volume,
server->fs_act_jif = jiffies;
down_write(&volume->server_sem);
- /* first, find where the server is in the active list (if it
+ /* firstly, find where the server is in the active list (if it
* is) */
for (loop = 0; loop < volume->nservers; loop++)
if (volume->servers[loop] == server)
@@ -429,6 +422,7 @@ int afs_volume_release_fileserver(struct afs_volume *volume,
case -ENETUNREACH:
case -EHOSTUNREACH:
case -ECONNREFUSED:
+ case -ETIME:
case -ETIMEDOUT:
case -EREMOTEIO:
/* mark the server as dead
@@ -464,40 +458,3 @@ try_next_server:
_leave(" [try next server]");
return 0;
}
-
-/*
- * match a volume hash record stored in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_volume_cache_match(void *target,
- const void *entry)
-{
- const struct afs_cache_vhash *vhash = entry;
- struct afs_volume *volume = target;
-
- _enter("{%u},{%u}", volume->type, vhash->vtype);
-
- if (volume->type == vhash->vtype) {
- _leave(" = SUCCESS");
- return CACHEFS_MATCH_SUCCESS;
- }
-
- _leave(" = FAILED");
- return CACHEFS_MATCH_FAILED;
-}
-#endif
-
-/*
- * update a volume hash record stored in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static void afs_volume_cache_update(void *source, void *entry)
-{
- struct afs_cache_vhash *vhash = entry;
- struct afs_volume *volume = source;
-
- _enter("");
-
- vhash->vtype = volume->type;
-}
-#endif
generated by cgit v1.1 at 2024-12-24 13:32:08 +0000