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OpenCloudOS-Kernel
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Merge git://git.linux-nfs.org/pub/linux/nfs-2.6 

* git://git.linux-nfs.org/pub/linux/nfs-2.6:
  SUNRPC: Replace flush_workqueue() with cancel_work_sync() and friends
  NFS: Replace flush_scheduled_work with cancel_work_sync() and friends
  SUNRPC: Don't call gss_delete_sec_context() from an rcu context
  NFSv4: Don't call put_rpccred() from an rcu callback
  NFS: Fix NFSv4 open stateid regressions
  NFSv4: Fix a locking regression in nfs4_set_mode_locked()
  NFS: Fix put_nfs_open_context
  SUNRPC: Fix a race in rpciod_down()
This commit is contained in:
Linus Torvalds 2007-08-09 08:38:14 -07:00
parent 6a0ed91e36 4011cd9788
commit 8b80fc02b8
11 changed files with 67 additions and 84 deletions
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21
fs/nfs/delegation.c
View File

@ -20,10 +20,8 @@
#include "delegation.h"
#include "internal.h"
static void nfs_free_delegation(struct nfs_delegation *delegation)
static void nfs_do_free_delegation(struct nfs_delegation *delegation)
{
if (delegation->cred)
put_rpccred(delegation->cred);
kfree(delegation);
}
@ -31,7 +29,18 @@ static void nfs_free_delegation_callback(struct rcu_head *head)
{
struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu);
nfs_free_delegation(delegation);
nfs_do_free_delegation(delegation);
}
static void nfs_free_delegation(struct nfs_delegation *delegation)
{
struct rpc_cred *cred;
cred = rcu_dereference(delegation->cred);
rcu_assign_pointer(delegation->cred, NULL);
call_rcu(&delegation->rcu, nfs_free_delegation_callback);
if (cred)
put_rpccred(cred);
}
static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state)
@ -166,7 +175,7 @@ static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *
int res = 0;
res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid);
call_rcu(&delegation->rcu, nfs_free_delegation_callback);
nfs_free_delegation(delegation);
return res;
}
@ -448,7 +457,7 @@ restart:
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation != NULL)
call_rcu(&delegation->rcu, nfs_free_delegation_callback);
nfs_free_delegation(delegation);
goto restart;
}
rcu_read_unlock();

24
fs/nfs/inode.c
View File

@ -468,7 +468,7 @@ static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, str
ctx->lockowner = current->files;
ctx->error = 0;
ctx->dir_cookie = 0;
kref_init(&ctx->kref);
atomic_set(&ctx->count, 1);
}
return ctx;
}
@ -476,21 +476,18 @@ static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, str
struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
{
if (ctx != NULL)
kref_get(&ctx->kref);
atomic_inc(&ctx->count);
return ctx;
}
static void nfs_free_open_context(struct kref *kref)
void put_nfs_open_context(struct nfs_open_context *ctx)
{
struct nfs_open_context *ctx = container_of(kref,
struct nfs_open_context, kref);
struct inode *inode = ctx->path.dentry->d_inode;
if (!list_empty(&ctx->list)) {
struct inode *inode = ctx->path.dentry->d_inode;
spin_lock(&inode->i_lock);
list_del(&ctx->list);
spin_unlock(&inode->i_lock);
}
if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock))
return;
list_del(&ctx->list);
spin_unlock(&inode->i_lock);
if (ctx->state != NULL)
nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
if (ctx->cred != NULL)
@ -500,11 +497,6 @@ static void nfs_free_open_context(struct kref *kref)
kfree(ctx);
}
void put_nfs_open_context(struct nfs_open_context *ctx)
{
kref_put(&ctx->kref, nfs_free_open_context);
}
/*
* Ensure that mmap has a recent RPC credential for use when writing out
* shared pages

6
fs/nfs/namespace.c
View File

@ -175,10 +175,8 @@ static void nfs_expire_automounts(struct work_struct *work)
void nfs_release_automount_timer(void)
{
if (list_empty(&nfs_automount_list)) {
cancel_delayed_work(&nfs_automount_task);
flush_scheduled_work();
}
if (list_empty(&nfs_automount_list))
cancel_delayed_work_sync(&nfs_automount_task);
}
/*

16
fs/nfs/nfs4proc.c
View File

@ -332,11 +332,9 @@ static int can_open_cached(struct nfs4_state *state, int mode)
switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
case FMODE_READ:
ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
break;
case FMODE_WRITE:
ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
break;
case FMODE_READ|FMODE_WRITE:
ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
@ -1260,7 +1258,7 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
switch (task->tk_status) {
case 0:
nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
nfs_set_open_stateid(state, &calldata->res.stateid, 0);
renew_lease(server, calldata->timestamp);
break;
case -NFS4ERR_STALE_STATEID:
@ -1286,23 +1284,19 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
.rpc_cred = state->owner->so_cred,
};
int clear_rd, clear_wr, clear_rdwr;
int mode;
if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
return;
mode = FMODE_READ|FMODE_WRITE;
clear_rd = clear_wr = clear_rdwr = 0;
spin_lock(&state->owner->so_lock);
/* Calculate the change in open mode */
if (state->n_rdwr == 0) {
if (state->n_rdonly == 0) {
mode &= ~FMODE_READ;
clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
}
if (state->n_wronly == 0) {
mode &= ~FMODE_WRITE;
clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
}
@ -1314,9 +1308,13 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
return;
}
nfs_fattr_init(calldata->res.fattr);
if (mode != 0)
if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
calldata->arg.open_flags = mode;
calldata->arg.open_flags = FMODE_READ;
} else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
calldata->arg.open_flags = FMODE_WRITE;
}
calldata->timestamp = jiffies;
rpc_call_setup(task, &msg, 0);
}

5
fs/nfs/nfs4renewd.c
View File

@ -127,16 +127,15 @@ nfs4_schedule_state_renewal(struct nfs_client *clp)
void
nfs4_renewd_prepare_shutdown(struct nfs_server *server)
{
flush_scheduled_work();
cancel_delayed_work(&server->nfs_client->cl_renewd);
}
void
nfs4_kill_renewd(struct nfs_client *clp)
{
down_read(&clp->cl_sem);
cancel_delayed_work(&clp->cl_renewd);
cancel_delayed_work_sync(&clp->cl_renewd);
up_read(&clp->cl_sem);
flush_scheduled_work();
}
/*

5
fs/nfs/nfs4state.c
View File

@ -341,8 +341,6 @@ nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode)
else
list_move_tail(&state->open_states, &state->owner->so_states);
}
if (mode == 0)
list_del_init(&state->inode_states);
state->state = mode;
}
@ -415,8 +413,7 @@ void nfs4_put_open_state(struct nfs4_state *state)
if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
return;
spin_lock(&inode->i_lock);
if (!list_empty(&state->inode_states))
list_del(&state->inode_states);
list_del(&state->inode_states);
list_del(&state->open_states);
spin_unlock(&inode->i_lock);
spin_unlock(&owner->so_lock);

2
include/linux/nfs_fs.h
View File

@ -71,7 +71,7 @@ struct nfs_access_entry {
struct nfs4_state;
struct nfs_open_context {
struct kref kref;
atomic_t count;
struct path path;
struct rpc_cred *cred;
struct nfs4_state *state;

9
net/sunrpc/auth_gss/auth_gss.c
View File

@ -736,9 +736,6 @@ gss_do_free_ctx(struct gss_cl_ctx *ctx)
{
dprintk("RPC: gss_free_ctx\n");
if (ctx->gc_gss_ctx)
gss_delete_sec_context(&ctx->gc_gss_ctx);
kfree(ctx->gc_wire_ctx.data);
kfree(ctx);
}
@ -753,7 +750,13 @@ gss_free_ctx_callback(struct rcu_head *head)
static void
gss_free_ctx(struct gss_cl_ctx *ctx)
{
struct gss_ctx *gc_gss_ctx;
gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx);
rcu_assign_pointer(ctx->gc_gss_ctx, NULL);
call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
if (gc_gss_ctx)
gss_delete_sec_context(&gc_gss_ctx);
}
static void

3
net/sunrpc/cache.c
View File

@ -371,8 +371,7 @@ int cache_unregister(struct cache_detail *cd)
}
if (list_empty(&cache_list)) {
/* module must be being unloaded so its safe to kill the worker */
cancel_delayed_work(&cache_cleaner);
flush_scheduled_work();
cancel_delayed_work_sync(&cache_cleaner);
}
return 0;
}

3
net/sunrpc/rpc_pipe.c
View File

@ -132,8 +132,7 @@ rpc_close_pipes(struct inode *inode)
rpci->nwriters = 0;
if (ops->release_pipe)
ops->release_pipe(inode);
cancel_delayed_work(&rpci->queue_timeout);
flush_workqueue(rpciod_workqueue);
cancel_delayed_work_sync(&rpci->queue_timeout);
}
rpc_inode_setowner(inode, NULL);
mutex_unlock(&inode->i_mutex);

57
net/sunrpc/sched.c
View File

@ -50,8 +50,6 @@ static RPC_WAITQ(delay_queue, "delayq");
/*
* rpciod-related stuff
*/
static DEFINE_MUTEX(rpciod_mutex);
static atomic_t rpciod_users = ATOMIC_INIT(0);
struct workqueue_struct *rpciod_workqueue;
/*
@ -961,60 +959,49 @@ void rpc_killall_tasks(struct rpc_clnt *clnt)
spin_unlock(&clnt->cl_lock);
}
int rpciod_up(void)
{
return try_module_get(THIS_MODULE) ? 0 : -EINVAL;
}
void rpciod_down(void)
{
module_put(THIS_MODULE);
}
/*
* Start up the rpciod process if it's not already running.
* Start up the rpciod workqueue.
*/
int
rpciod_up(void)
static int rpciod_start(void)
{
struct workqueue_struct *wq;
int error = 0;
if (atomic_inc_not_zero(&rpciod_users))
return 0;
mutex_lock(&rpciod_mutex);
/* Guard against races with rpciod_down() */
if (rpciod_workqueue != NULL)
goto out_ok;
/*
* Create the rpciod thread and wait for it to start.
*/
dprintk("RPC: creating workqueue rpciod\n");
error = -ENOMEM;
wq = create_workqueue("rpciod");
if (wq == NULL)
goto out;
rpciod_workqueue = wq;
error = 0;
out_ok:
atomic_inc(&rpciod_users);
out:
mutex_unlock(&rpciod_mutex);
return error;
return rpciod_workqueue != NULL;
}
void
rpciod_down(void)
static void rpciod_stop(void)
{
if (!atomic_dec_and_test(&rpciod_users))
return;
struct workqueue_struct *wq = NULL;
mutex_lock(&rpciod_mutex);
if (rpciod_workqueue == NULL)
return;
dprintk("RPC: destroying workqueue rpciod\n");
if (atomic_read(&rpciod_users) == 0 && rpciod_workqueue != NULL) {
destroy_workqueue(rpciod_workqueue);
rpciod_workqueue = NULL;
}
mutex_unlock(&rpciod_mutex);
wq = rpciod_workqueue;
rpciod_workqueue = NULL;
destroy_workqueue(wq);
}
void
rpc_destroy_mempool(void)
{
rpciod_stop();
if (rpc_buffer_mempool)
mempool_destroy(rpc_buffer_mempool);
if (rpc_task_mempool)
@ -1048,6 +1035,8 @@ rpc_init_mempool(void)
rpc_buffer_slabp);
if (!rpc_buffer_mempool)
goto err_nomem;
if (!rpciod_start())
goto err_nomem;
return 0;
err_nomem:
rpc_destroy_mempool();