linux-hardened/fs/afs/vnode.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

1025 lines
24 KiB
C

/* AFS vnode management
*
* 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
* 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/fs.h>
#include <linux/sched.h>
#include "internal.h"
#if 0
static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent,
int depth, char lr)
{
struct afs_vnode *vnode;
bool bad = false;
if (!node)
return false;
if (node->rb_left)
bad = dump_tree_aux(node->rb_left, node, depth + 2, '/');
vnode = rb_entry(node, struct afs_vnode, cb_promise);
_debug("%c %*.*s%c%p {%d}",
rb_is_red(node) ? 'R' : 'B',
depth, depth, "", lr,
vnode, vnode->cb_expires_at);
if (rb_parent(node) != parent) {
printk("BAD: %p != %p\n", rb_parent(node), parent);
bad = true;
}
if (node->rb_right)
bad |= dump_tree_aux(node->rb_right, node, depth + 2, '\\');
return bad;
}
static noinline void dump_tree(const char *name, struct afs_server *server)
{
_enter("%s", name);
if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-'))
BUG();
}
#endif
/*
* insert a vnode into the backing server's vnode tree
*/
static void afs_install_vnode(struct afs_vnode *vnode,
struct afs_server *server)
{
struct afs_server *old_server = vnode->server;
struct afs_vnode *xvnode;
struct rb_node *parent, **p;
_enter("%p,%p", vnode, server);
if (old_server) {
spin_lock(&old_server->fs_lock);
rb_erase(&vnode->server_rb, &old_server->fs_vnodes);
spin_unlock(&old_server->fs_lock);
}
afs_get_server(server);
vnode->server = server;
afs_put_server(old_server);
/* insert into the server's vnode tree in FID order */
spin_lock(&server->fs_lock);
parent = NULL;
p = &server->fs_vnodes.rb_node;
while (*p) {
parent = *p;
xvnode = rb_entry(parent, struct afs_vnode, server_rb);
if (vnode->fid.vid < xvnode->fid.vid)
p = &(*p)->rb_left;
else if (vnode->fid.vid > xvnode->fid.vid)
p = &(*p)->rb_right;
else if (vnode->fid.vnode < xvnode->fid.vnode)
p = &(*p)->rb_left;
else if (vnode->fid.vnode > xvnode->fid.vnode)
p = &(*p)->rb_right;
else if (vnode->fid.unique < xvnode->fid.unique)
p = &(*p)->rb_left;
else if (vnode->fid.unique > xvnode->fid.unique)
p = &(*p)->rb_right;
else
BUG(); /* can't happen unless afs_iget() malfunctions */
}
rb_link_node(&vnode->server_rb, parent, p);
rb_insert_color(&vnode->server_rb, &server->fs_vnodes);
spin_unlock(&server->fs_lock);
_leave("");
}
/*
* insert a vnode into the promising server's update/expiration tree
* - caller must hold vnode->lock
*/
static void afs_vnode_note_promise(struct afs_vnode *vnode,
struct afs_server *server)
{
struct afs_server *old_server;
struct afs_vnode *xvnode;
struct rb_node *parent, **p;
_enter("%p,%p", vnode, server);
ASSERT(server != NULL);
old_server = vnode->server;
if (vnode->cb_promised) {
if (server == old_server &&
vnode->cb_expires == vnode->cb_expires_at) {
_leave(" [no change]");
return;
}
spin_lock(&old_server->cb_lock);
if (vnode->cb_promised) {
_debug("delete");
rb_erase(&vnode->cb_promise, &old_server->cb_promises);
vnode->cb_promised = false;
}
spin_unlock(&old_server->cb_lock);
}
if (vnode->server != server)
afs_install_vnode(vnode, server);
vnode->cb_expires_at = vnode->cb_expires;
_debug("PROMISE on %p {%lu}",
vnode, (unsigned long) vnode->cb_expires_at);
/* abuse an RB-tree to hold the expiration order (we may have multiple
* items with the same expiration time) */
spin_lock(&server->cb_lock);
parent = NULL;
p = &server->cb_promises.rb_node;
while (*p) {
parent = *p;
xvnode = rb_entry(parent, struct afs_vnode, cb_promise);
if (vnode->cb_expires_at < xvnode->cb_expires_at)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&vnode->cb_promise, parent, p);
rb_insert_color(&vnode->cb_promise, &server->cb_promises);
vnode->cb_promised = true;
spin_unlock(&server->cb_lock);
_leave("");
}
/*
* handle remote file deletion by discarding the callback promise
*/
static void afs_vnode_deleted_remotely(struct afs_vnode *vnode)
{
struct afs_server *server;
_enter("{%p}", vnode->server);
set_bit(AFS_VNODE_DELETED, &vnode->flags);
server = vnode->server;
if (server) {
if (vnode->cb_promised) {
spin_lock(&server->cb_lock);
if (vnode->cb_promised) {
rb_erase(&vnode->cb_promise,
&server->cb_promises);
vnode->cb_promised = false;
}
spin_unlock(&server->cb_lock);
}
spin_lock(&server->fs_lock);
rb_erase(&vnode->server_rb, &server->fs_vnodes);
spin_unlock(&server->fs_lock);
vnode->server = NULL;
afs_put_server(server);
} else {
ASSERT(!vnode->cb_promised);
}
_leave("");
}
/*
* finish off updating the recorded status of a file after a successful
* operation completion
* - starts callback expiry timer
* - adds to server's callback list
*/
void afs_vnode_finalise_status_update(struct afs_vnode *vnode,
struct afs_server *server)
{
struct afs_server *oldserver = NULL;
_enter("%p,%p", vnode, server);
spin_lock(&vnode->lock);
clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
afs_vnode_note_promise(vnode, server);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
wake_up_all(&vnode->update_waitq);
afs_put_server(oldserver);
_leave("");
}
/*
* finish off updating the recorded status of a file after an operation failed
*/
static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret)
{
_enter("{%x:%u},%d", vnode->fid.vid, vnode->fid.vnode, ret);
spin_lock(&vnode->lock);
clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
if (ret == -ENOENT) {
/* the file was deleted on the server */
_debug("got NOENT from server - marking file deleted");
afs_vnode_deleted_remotely(vnode);
}
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
wake_up_all(&vnode->update_waitq);
_leave("");
}
/*
* fetch file status from the volume
* - don't issue a fetch if:
* - the changed bit is not set and there's a valid callback
* - there are any outstanding ops that will fetch the status
* - TODO implement local caching
*/
int afs_vnode_fetch_status(struct afs_vnode *vnode,
struct afs_vnode *auth_vnode, struct key *key)
{
struct afs_server *server;
unsigned long acl_order;
int ret;
DECLARE_WAITQUEUE(myself, current);
_enter("%s,{%x:%u.%u}",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
vnode->cb_promised) {
_leave(" [unchanged]");
return 0;
}
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
_leave(" [deleted]");
return -ENOENT;
}
acl_order = 0;
if (auth_vnode)
acl_order = auth_vnode->acl_order;
spin_lock(&vnode->lock);
if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
vnode->cb_promised) {
spin_unlock(&vnode->lock);
_leave(" [unchanged]");
return 0;
}
ASSERTCMP(vnode->update_cnt, >=, 0);
if (vnode->update_cnt > 0) {
/* someone else started a fetch */
_debug("wait on fetch %d", vnode->update_cnt);
set_current_state(TASK_UNINTERRUPTIBLE);
ASSERT(myself.func != NULL);
add_wait_queue(&vnode->update_waitq, &myself);
/* wait for the status to be updated */
for (;;) {
if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
break;
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
break;
/* check to see if it got updated and invalidated all
* before we saw it */
if (vnode->update_cnt == 0) {
remove_wait_queue(&vnode->update_waitq,
&myself);
set_current_state(TASK_RUNNING);
goto get_anyway;
}
spin_unlock(&vnode->lock);
schedule();
set_current_state(TASK_UNINTERRUPTIBLE);
spin_lock(&vnode->lock);
}
remove_wait_queue(&vnode->update_waitq, &myself);
spin_unlock(&vnode->lock);
set_current_state(TASK_RUNNING);
return test_bit(AFS_VNODE_DELETED, &vnode->flags) ?
-ENOENT : 0;
}
get_anyway:
/* okay... we're going to have to initiate the op */
vnode->update_cnt++;
spin_unlock(&vnode->lock);
/* merge AFS status fetches and clear outstanding callback on this
* vnode */
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %p{%08x}",
server, ntohl(server->addr.s_addr));
ret = afs_fs_fetch_file_status(server, key, vnode, NULL,
&afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
_debug("adjust");
if (auth_vnode)
afs_cache_permit(vnode, key, acl_order);
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
_debug("failed [%d]", ret);
afs_vnode_status_update_failed(vnode, ret);
}
ASSERTCMP(vnode->update_cnt, >=, 0);
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* fetch file data from the volume
* - TODO implement caching
*/
int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key,
off_t offset, size_t length, struct page *page)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x,,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key));
/* this op will fetch the status */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
/* merge in AFS status fetches and clear outstanding callback on this
* vnode */
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_fetch_data(server, key, vnode, offset, length,
page, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
}
_leave(" = %d", ret);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
return PTR_ERR(server);
}
/*
* make a file or a directory
*/
int afs_vnode_create(struct afs_vnode *vnode, struct key *key,
const char *name, umode_t mode, struct afs_fid *newfid,
struct afs_file_status *newstatus,
struct afs_callback *newcb, struct afs_server **_server)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x,%s,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name);
/* this op will fetch the status on the directory we're creating in */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_create(server, key, vnode, name, mode, newfid,
newstatus, newcb, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
*_server = server;
} else {
afs_vnode_status_update_failed(vnode, ret);
*_server = NULL;
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* remove a file or directory
*/
int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name,
bool isdir)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x,%s",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name);
/* this op will fetch the status on the directory we're removing from */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_remove(server, key, vnode, name, isdir,
&afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* create a hard link
*/
int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode,
struct key *key, const char *name)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s",
dvnode->volume->vlocation->vldb.name,
dvnode->fid.vid,
dvnode->fid.vnode,
dvnode->fid.unique,
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name);
/* this op will fetch the status on the directory we're removing from */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
spin_lock(&dvnode->lock);
dvnode->update_cnt++;
spin_unlock(&dvnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(dvnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_link(server, key, dvnode, vnode, name,
&afs_sync_call);
} while (!afs_volume_release_fileserver(dvnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_vnode_finalise_status_update(dvnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
afs_vnode_status_update_failed(dvnode, ret);
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
spin_lock(&dvnode->lock);
dvnode->update_cnt--;
ASSERTCMP(dvnode->update_cnt, >=, 0);
spin_unlock(&dvnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* create a symbolic link
*/
int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key,
const char *name, const char *content,
struct afs_fid *newfid,
struct afs_file_status *newstatus,
struct afs_server **_server)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x,%s,%s,,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name, content);
/* this op will fetch the status on the directory we're creating in */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_symlink(server, key, vnode, name, content,
newfid, newstatus, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
*_server = server;
} else {
afs_vnode_status_update_failed(vnode, ret);
*_server = NULL;
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* rename a file
*/
int afs_vnode_rename(struct afs_vnode *orig_dvnode,
struct afs_vnode *new_dvnode,
struct key *key,
const char *orig_name,
const char *new_name)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s",
orig_dvnode->volume->vlocation->vldb.name,
orig_dvnode->fid.vid,
orig_dvnode->fid.vnode,
orig_dvnode->fid.unique,
new_dvnode->volume->vlocation->vldb.name,
new_dvnode->fid.vid,
new_dvnode->fid.vnode,
new_dvnode->fid.unique,
key_serial(key),
orig_name,
new_name);
/* this op will fetch the status on both the directories we're dealing
* with */
spin_lock(&orig_dvnode->lock);
orig_dvnode->update_cnt++;
spin_unlock(&orig_dvnode->lock);
if (new_dvnode != orig_dvnode) {
spin_lock(&new_dvnode->lock);
new_dvnode->update_cnt++;
spin_unlock(&new_dvnode->lock);
}
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(orig_dvnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_rename(server, key, orig_dvnode, orig_name,
new_dvnode, new_name, &afs_sync_call);
} while (!afs_volume_release_fileserver(orig_dvnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(orig_dvnode, server);
if (new_dvnode != orig_dvnode)
afs_vnode_finalise_status_update(new_dvnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(orig_dvnode, ret);
if (new_dvnode != orig_dvnode)
afs_vnode_status_update_failed(new_dvnode, ret);
}
_leave(" = %d [cnt %d]", ret, orig_dvnode->update_cnt);
return ret;
no_server:
spin_lock(&orig_dvnode->lock);
orig_dvnode->update_cnt--;
ASSERTCMP(orig_dvnode->update_cnt, >=, 0);
spin_unlock(&orig_dvnode->lock);
if (new_dvnode != orig_dvnode) {
spin_lock(&new_dvnode->lock);
new_dvnode->update_cnt--;
ASSERTCMP(new_dvnode->update_cnt, >=, 0);
spin_unlock(&new_dvnode->lock);
}
_leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt);
return PTR_ERR(server);
}
/*
* write to a file
*/
int afs_vnode_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last,
unsigned offset, unsigned to)
{
struct afs_server *server;
struct afs_vnode *vnode = wb->vnode;
int ret;
_enter("%s{%x:%u.%u},%x,%lx,%lx,%x,%x",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(wb->key),
first, last, offset, to);
/* this op will fetch the status */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_store_data(server, wb, first, last, offset, to,
&afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
}
_leave(" = %d", ret);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
return PTR_ERR(server);
}
/*
* set the attributes on a file
*/
int afs_vnode_setattr(struct afs_vnode *vnode, struct key *key,
struct iattr *attr)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key));
/* this op will fetch the status */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_setattr(server, key, vnode, attr, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
}
_leave(" = %d", ret);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
return PTR_ERR(server);
}
/*
* get the status of a volume
*/
int afs_vnode_get_volume_status(struct afs_vnode *vnode, struct key *key,
struct afs_volume_status *vs)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key));
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_get_volume_status(server, key, vnode, vs, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0)
afs_put_server(server);
_leave(" = %d", ret);
return ret;
no_server:
return PTR_ERR(server);
}
/*
* get a lock on a file
*/
int afs_vnode_set_lock(struct afs_vnode *vnode, struct key *key,
afs_lock_type_t type)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x,%u",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key), type);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_set_lock(server, key, vnode, type, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0)
afs_put_server(server);
_leave(" = %d", ret);
return ret;
no_server:
return PTR_ERR(server);
}
/*
* extend a lock on a file
*/
int afs_vnode_extend_lock(struct afs_vnode *vnode, struct key *key)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key));
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_extend_lock(server, key, vnode, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0)
afs_put_server(server);
_leave(" = %d", ret);
return ret;
no_server:
return PTR_ERR(server);
}
/*
* release a lock on a file
*/
int afs_vnode_release_lock(struct afs_vnode *vnode, struct key *key)
{
struct afs_server *server;
int ret;
_enter("%s{%x:%u.%u},%x",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key));
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_release_lock(server, key, vnode, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0)
afs_put_server(server);
_leave(" = %d", ret);
return ret;
no_server:
return PTR_ERR(server);
}