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author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-26 12:33:05 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-26 12:33:05 -0700 |
commit | 89ff77837a67994e4a4a20bb648687fbcc3083f2 (patch) | |
tree | bba9c5c698f38a77bfe35bc26d8bd18c2e557df0 /net | |
parent | 932ff06b2a3b4dd3da4dff35c51fa3398e30b635 (diff) | |
parent | 83c168bf8017212a9d502536f9dcd0b54d24e330 (diff) | |
download | linux-3.10-89ff77837a67994e4a4a20bb648687fbcc3083f2.tar.gz linux-3.10-89ff77837a67994e4a4a20bb648687fbcc3083f2.tar.bz2 linux-3.10-89ff77837a67994e4a4a20bb648687fbcc3083f2.zip |
Merge tag 'nfs-for-3.10-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes from Trond Myklebust:
- Stable fix to prevent an rpc_task wakeup race
- Fix a NFSv4.1 session drain deadlock
- Fix a NFSv4/v4.1 mount regression when not running rpc.gssd
- Ensure auth_gss pipe detection works in namespaces
- Fix SETCLIENTID fallback if rpcsec_gss is not available
* tag 'nfs-for-3.10-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFS: Fix SETCLIENTID fallback if GSS is not available
SUNRPC: Prevent an rpc_task wakeup race
NFSv4.1 Fix a pNFS session draining deadlock
SUNRPC: Convert auth_gss pipe detection to work in namespaces
SUNRPC: Faster detection if gssd is actually running
SUNRPC: Fix a bug in gss_create_upcall
Diffstat (limited to 'net')
-rw-r--r-- | net/sunrpc/auth_gss/auth_gss.c | 62 | ||||
-rw-r--r-- | net/sunrpc/netns.h | 4 | ||||
-rw-r--r-- | net/sunrpc/rpc_pipe.c | 5 | ||||
-rw-r--r-- | net/sunrpc/sched.c | 8 |
4 files changed, 57 insertions, 22 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 7da6b457f66..fc2f78d6a9b 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -52,6 +52,8 @@ #include <linux/sunrpc/gss_api.h> #include <asm/uaccess.h> +#include "../netns.h" + static const struct rpc_authops authgss_ops; static const struct rpc_credops gss_credops; @@ -85,8 +87,6 @@ struct gss_auth { }; /* pipe_version >= 0 if and only if someone has a pipe open. */ -static int pipe_version = -1; -static atomic_t pipe_users = ATOMIC_INIT(0); static DEFINE_SPINLOCK(pipe_version_lock); static struct rpc_wait_queue pipe_version_rpc_waitqueue; static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); @@ -266,24 +266,27 @@ struct gss_upcall_msg { char databuf[UPCALL_BUF_LEN]; }; -static int get_pipe_version(void) +static int get_pipe_version(struct net *net) { + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); int ret; spin_lock(&pipe_version_lock); - if (pipe_version >= 0) { - atomic_inc(&pipe_users); - ret = pipe_version; + if (sn->pipe_version >= 0) { + atomic_inc(&sn->pipe_users); + ret = sn->pipe_version; } else ret = -EAGAIN; spin_unlock(&pipe_version_lock); return ret; } -static void put_pipe_version(void) +static void put_pipe_version(struct net *net) { - if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { - pipe_version = -1; + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + + if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { + sn->pipe_version = -1; spin_unlock(&pipe_version_lock); } } @@ -291,9 +294,10 @@ static void put_pipe_version(void) static void gss_release_msg(struct gss_upcall_msg *gss_msg) { + struct net *net = rpc_net_ns(gss_msg->auth->client); if (!atomic_dec_and_test(&gss_msg->count)) return; - put_pipe_version(); + put_pipe_version(net); BUG_ON(!list_empty(&gss_msg->list)); if (gss_msg->ctx != NULL) gss_put_ctx(gss_msg->ctx); @@ -439,7 +443,10 @@ static void gss_encode_msg(struct gss_upcall_msg *gss_msg, struct rpc_clnt *clnt, const char *service_name) { - if (pipe_version == 0) + struct net *net = rpc_net_ns(clnt); + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + + if (sn->pipe_version == 0) gss_encode_v0_msg(gss_msg); else /* pipe_version == 1 */ gss_encode_v1_msg(gss_msg, clnt, service_name); @@ -455,7 +462,7 @@ gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt, gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); if (gss_msg == NULL) return ERR_PTR(-ENOMEM); - vers = get_pipe_version(); + vers = get_pipe_version(rpc_net_ns(clnt)); if (vers < 0) { kfree(gss_msg); return ERR_PTR(vers); @@ -559,24 +566,34 @@ out: static inline int gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) { + struct net *net = rpc_net_ns(gss_auth->client); + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); struct rpc_pipe *pipe; struct rpc_cred *cred = &gss_cred->gc_base; struct gss_upcall_msg *gss_msg; + unsigned long timeout; DEFINE_WAIT(wait); - int err = 0; + int err; dprintk("RPC: %s for uid %u\n", __func__, from_kuid(&init_user_ns, cred->cr_uid)); retry: + err = 0; + /* Default timeout is 15s unless we know that gssd is not running */ + timeout = 15 * HZ; + if (!sn->gssd_running) + timeout = HZ >> 2; gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); if (PTR_ERR(gss_msg) == -EAGAIN) { err = wait_event_interruptible_timeout(pipe_version_waitqueue, - pipe_version >= 0, 15*HZ); - if (pipe_version < 0) { + sn->pipe_version >= 0, timeout); + if (sn->pipe_version < 0) { + if (err == 0) + sn->gssd_running = 0; warn_gssd(); err = -EACCES; } - if (err) + if (err < 0) goto out; goto retry; } @@ -707,20 +724,22 @@ out: static int gss_pipe_open(struct inode *inode, int new_version) { + struct net *net = inode->i_sb->s_fs_info; + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); int ret = 0; spin_lock(&pipe_version_lock); - if (pipe_version < 0) { + if (sn->pipe_version < 0) { /* First open of any gss pipe determines the version: */ - pipe_version = new_version; + sn->pipe_version = new_version; rpc_wake_up(&pipe_version_rpc_waitqueue); wake_up(&pipe_version_waitqueue); - } else if (pipe_version != new_version) { + } else if (sn->pipe_version != new_version) { /* Trying to open a pipe of a different version */ ret = -EBUSY; goto out; } - atomic_inc(&pipe_users); + atomic_inc(&sn->pipe_users); out: spin_unlock(&pipe_version_lock); return ret; @@ -740,6 +759,7 @@ static int gss_pipe_open_v1(struct inode *inode) static void gss_pipe_release(struct inode *inode) { + struct net *net = inode->i_sb->s_fs_info; struct rpc_pipe *pipe = RPC_I(inode)->pipe; struct gss_upcall_msg *gss_msg; @@ -758,7 +778,7 @@ restart: } spin_unlock(&pipe->lock); - put_pipe_version(); + put_pipe_version(net); } static void diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h index 7111a4c9113..74d948f5d5a 100644 --- a/net/sunrpc/netns.h +++ b/net/sunrpc/netns.h @@ -28,7 +28,11 @@ struct sunrpc_net { wait_queue_head_t gssp_wq; struct rpc_clnt *gssp_clnt; int use_gss_proxy; + int pipe_version; + atomic_t pipe_users; struct proc_dir_entry *use_gssp_proc; + + unsigned int gssd_running; }; extern int sunrpc_net_id; diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index a9129f8d707..e7ce4b3eb0b 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -216,11 +216,14 @@ rpc_destroy_inode(struct inode *inode) static int rpc_pipe_open(struct inode *inode, struct file *filp) { + struct net *net = inode->i_sb->s_fs_info; + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); struct rpc_pipe *pipe; int first_open; int res = -ENXIO; mutex_lock(&inode->i_mutex); + sn->gssd_running = 1; pipe = RPC_I(inode)->pipe; if (pipe == NULL) goto out; @@ -1069,6 +1072,8 @@ void rpc_pipefs_init_net(struct net *net) struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); mutex_init(&sn->pipefs_sb_lock); + sn->gssd_running = 1; + sn->pipe_version = -1; } /* diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index f8529fc8e54..5356b120dbf 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -324,11 +324,17 @@ EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task); * Note: If the task is ASYNC, and is being made runnable after sitting on an * rpc_wait_queue, this must be called with the queue spinlock held to protect * the wait queue operation. + * Note the ordering of rpc_test_and_set_running() and rpc_clear_queued(), + * which is needed to ensure that __rpc_execute() doesn't loop (due to the + * lockless RPC_IS_QUEUED() test) before we've had a chance to test + * the RPC_TASK_RUNNING flag. */ static void rpc_make_runnable(struct rpc_task *task) { + bool need_wakeup = !rpc_test_and_set_running(task); + rpc_clear_queued(task); - if (rpc_test_and_set_running(task)) + if (!need_wakeup) return; if (RPC_IS_ASYNC(task)) { INIT_WORK(&task->u.tk_work, rpc_async_schedule); |