diff options
Diffstat (limited to 'fs/lockd')
| -rw-r--r-- | fs/lockd/Makefile | 10 | ||||
| -rw-r--r-- | fs/lockd/clntlock.c | 245 | ||||
| -rw-r--r-- | fs/lockd/clntproc.c | 820 | ||||
| -rw-r--r-- | fs/lockd/host.c | 346 | ||||
| -rw-r--r-- | fs/lockd/mon.c | 246 | ||||
| -rw-r--r-- | fs/lockd/svc.c | 519 | ||||
| -rw-r--r-- | fs/lockd/svc4proc.c | 580 | ||||
| -rw-r--r-- | fs/lockd/svclock.c | 686 | ||||
| -rw-r--r-- | fs/lockd/svcproc.c | 606 | ||||
| -rw-r--r-- | fs/lockd/svcshare.c | 111 | ||||
| -rw-r--r-- | fs/lockd/svcsubs.c | 309 | ||||
| -rw-r--r-- | fs/lockd/xdr.c | 635 | ||||
| -rw-r--r-- | fs/lockd/xdr4.c | 580 |
13 files changed, 5693 insertions, 0 deletions
diff --git a/fs/lockd/Makefile b/fs/lockd/Makefile new file mode 100644 index 0000000..7725a0a --- /dev/null +++ b/fs/lockd/Makefile @@ -0,0 +1,10 @@ +# +# Makefile for the linux lock manager stuff +# + +obj-$(CONFIG_LOCKD) += lockd.o + +lockd-objs-y := clntlock.o clntproc.o host.o svc.o svclock.o svcshare.o \ + svcproc.o svcsubs.o mon.o xdr.o +lockd-objs-$(CONFIG_LOCKD_V4) += xdr4.o svc4proc.o +lockd-objs := $(lockd-objs-y) diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c new file mode 100644 index 0000000..ef7103b --- /dev/null +++ b/fs/lockd/clntlock.c @@ -0,0 +1,245 @@ +/* + * linux/fs/lockd/clntlock.c + * + * Lock handling for the client side NLM implementation + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/time.h> +#include <linux/nfs_fs.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/lockd/lockd.h> +#include <linux/smp_lock.h> + +#define NLMDBG_FACILITY NLMDBG_CLIENT + +/* + * Local function prototypes + */ +static int reclaimer(void *ptr); + +/* + * The following functions handle blocking and granting from the + * client perspective. + */ + +/* + * This is the representation of a blocked client lock. + */ +struct nlm_wait { + struct nlm_wait * b_next; /* linked list */ + wait_queue_head_t b_wait; /* where to wait on */ + struct nlm_host * b_host; + struct file_lock * b_lock; /* local file lock */ + unsigned short b_reclaim; /* got to reclaim lock */ + u32 b_status; /* grant callback status */ +}; + +static struct nlm_wait * nlm_blocked; + +/* + * Block on a lock + */ +int +nlmclnt_block(struct nlm_host *host, struct file_lock *fl, u32 *statp) +{ + struct nlm_wait block, **head; + int err; + u32 pstate; + + block.b_host = host; + block.b_lock = fl; + init_waitqueue_head(&block.b_wait); + block.b_status = NLM_LCK_BLOCKED; + block.b_next = nlm_blocked; + nlm_blocked = █ + + /* Remember pseudo nsm state */ + pstate = host->h_state; + + /* Go to sleep waiting for GRANT callback. Some servers seem + * to lose callbacks, however, so we're going to poll from + * time to time just to make sure. + * + * For now, the retry frequency is pretty high; normally + * a 1 minute timeout would do. See the comment before + * nlmclnt_lock for an explanation. + */ + sleep_on_timeout(&block.b_wait, 30*HZ); + + for (head = &nlm_blocked; *head; head = &(*head)->b_next) { + if (*head == &block) { + *head = block.b_next; + break; + } + } + + if (!signalled()) { + *statp = block.b_status; + return 0; + } + + /* Okay, we were interrupted. Cancel the pending request + * unless the server has rebooted. + */ + if (pstate == host->h_state && (err = nlmclnt_cancel(host, fl)) < 0) + printk(KERN_NOTICE + "lockd: CANCEL call failed (errno %d)\n", -err); + + return -ERESTARTSYS; +} + +/* + * The server lockd has called us back to tell us the lock was granted + */ +u32 +nlmclnt_grant(struct nlm_lock *lock) +{ + struct nlm_wait *block; + + /* + * Look up blocked request based on arguments. + * Warning: must not use cookie to match it! + */ + for (block = nlm_blocked; block; block = block->b_next) { + if (nlm_compare_locks(block->b_lock, &lock->fl)) + break; + } + + /* Ooops, no blocked request found. */ + if (block == NULL) + return nlm_lck_denied; + + /* Alright, we found the lock. Set the return status and + * wake up the caller. + */ + block->b_status = NLM_LCK_GRANTED; + wake_up(&block->b_wait); + + return nlm_granted; +} + +/* + * The following procedures deal with the recovery of locks after a + * server crash. + */ + +/* + * Mark the locks for reclaiming. + * FIXME: In 2.5 we don't want to iterate through any global file_lock_list. + * Maintain NLM lock reclaiming lists in the nlm_host instead. + */ +static +void nlmclnt_mark_reclaim(struct nlm_host *host) +{ + struct file_lock *fl; + struct inode *inode; + struct list_head *tmp; + + list_for_each(tmp, &file_lock_list) { + fl = list_entry(tmp, struct file_lock, fl_link); + + inode = fl->fl_file->f_dentry->d_inode; + if (inode->i_sb->s_magic != NFS_SUPER_MAGIC) + continue; + if (fl->fl_u.nfs_fl.owner->host != host) + continue; + if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_GRANTED)) + continue; + fl->fl_u.nfs_fl.flags |= NFS_LCK_RECLAIM; + } +} + +/* + * Someone has sent us an SM_NOTIFY. Ensure we bind to the new port number, + * that we mark locks for reclaiming, and that we bump the pseudo NSM state. + */ +static inline +void nlmclnt_prepare_reclaim(struct nlm_host *host, u32 newstate) +{ + host->h_monitored = 0; + host->h_nsmstate = newstate; + host->h_state++; + host->h_nextrebind = 0; + nlm_rebind_host(host); + nlmclnt_mark_reclaim(host); + dprintk("NLM: reclaiming locks for host %s", host->h_name); +} + +/* + * Reclaim all locks on server host. We do this by spawning a separate + * reclaimer thread. + */ +void +nlmclnt_recovery(struct nlm_host *host, u32 newstate) +{ + if (host->h_reclaiming++) { + if (host->h_nsmstate == newstate) + return; + nlmclnt_prepare_reclaim(host, newstate); + } else { + nlmclnt_prepare_reclaim(host, newstate); + nlm_get_host(host); + __module_get(THIS_MODULE); + if (kernel_thread(reclaimer, host, CLONE_KERNEL) < 0) + module_put(THIS_MODULE); + } +} + +static int +reclaimer(void *ptr) +{ + struct nlm_host *host = (struct nlm_host *) ptr; + struct nlm_wait *block; + struct list_head *tmp; + struct file_lock *fl; + struct inode *inode; + + daemonize("%s-reclaim", host->h_name); + allow_signal(SIGKILL); + + /* This one ensures that our parent doesn't terminate while the + * reclaim is in progress */ + lock_kernel(); + lockd_up(); + + /* First, reclaim all locks that have been marked. */ +restart: + list_for_each(tmp, &file_lock_list) { + fl = list_entry(tmp, struct file_lock, fl_link); + + inode = fl->fl_file->f_dentry->d_inode; + if (inode->i_sb->s_magic != NFS_SUPER_MAGIC) + continue; + if (fl->fl_u.nfs_fl.owner->host != host) + continue; + if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_RECLAIM)) + continue; + + fl->fl_u.nfs_fl.flags &= ~NFS_LCK_RECLAIM; + nlmclnt_reclaim(host, fl); + if (signalled()) + break; + goto restart; + } + + host->h_reclaiming = 0; + + /* Now, wake up all processes that sleep on a blocked lock */ + for (block = nlm_blocked; block; block = block->b_next) { + if (block->b_host == host) { + block->b_status = NLM_LCK_DENIED_GRACE_PERIOD; + wake_up(&block->b_wait); + } + } + + /* Release host handle after use */ + nlm_release_host(host); + lockd_down(); + unlock_kernel(); + module_put_and_exit(0); +} diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c new file mode 100644 index 0000000..a440761 --- /dev/null +++ b/fs/lockd/clntproc.c @@ -0,0 +1,820 @@ +/* + * linux/fs/lockd/clntproc.c + * + * RPC procedures for the client side NLM implementation + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/nfs_fs.h> +#include <linux/utsname.h> +#include <linux/smp_lock.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/sm_inter.h> + +#define NLMDBG_FACILITY NLMDBG_CLIENT +#define NLMCLNT_GRACE_WAIT (5*HZ) + +static int nlmclnt_test(struct nlm_rqst *, struct file_lock *); +static int nlmclnt_lock(struct nlm_rqst *, struct file_lock *); +static int nlmclnt_unlock(struct nlm_rqst *, struct file_lock *); +static void nlmclnt_unlock_callback(struct rpc_task *); +static void nlmclnt_cancel_callback(struct rpc_task *); +static int nlm_stat_to_errno(u32 stat); +static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host); + +/* + * Cookie counter for NLM requests + */ +static u32 nlm_cookie = 0x1234; + +static inline void nlmclnt_next_cookie(struct nlm_cookie *c) +{ + memcpy(c->data, &nlm_cookie, 4); + memset(c->data+4, 0, 4); + c->len=4; + nlm_cookie++; +} + +static struct nlm_lockowner *nlm_get_lockowner(struct nlm_lockowner *lockowner) +{ + atomic_inc(&lockowner->count); + return lockowner; +} + +static void nlm_put_lockowner(struct nlm_lockowner *lockowner) +{ + if (!atomic_dec_and_lock(&lockowner->count, &lockowner->host->h_lock)) + return; + list_del(&lockowner->list); + spin_unlock(&lockowner->host->h_lock); + nlm_release_host(lockowner->host); + kfree(lockowner); +} + +static inline int nlm_pidbusy(struct nlm_host *host, uint32_t pid) +{ + struct nlm_lockowner *lockowner; + list_for_each_entry(lockowner, &host->h_lockowners, list) { + if (lockowner->pid == pid) + return -EBUSY; + } + return 0; +} + +static inline uint32_t __nlm_alloc_pid(struct nlm_host *host) +{ + uint32_t res; + do { + res = host->h_pidcount++; + } while (nlm_pidbusy(host, res) < 0); + return res; +} + +static struct nlm_lockowner *__nlm_find_lockowner(struct nlm_host *host, fl_owner_t owner) +{ + struct nlm_lockowner *lockowner; + list_for_each_entry(lockowner, &host->h_lockowners, list) { + if (lockowner->owner != owner) + continue; + return nlm_get_lockowner(lockowner); + } + return NULL; +} + +static struct nlm_lockowner *nlm_find_lockowner(struct nlm_host *host, fl_owner_t owner) +{ + struct nlm_lockowner *res, *new = NULL; + + spin_lock(&host->h_lock); + res = __nlm_find_lockowner(host, owner); + if (res == NULL) { + spin_unlock(&host->h_lock); + new = (struct nlm_lockowner *)kmalloc(sizeof(*new), GFP_KERNEL); + spin_lock(&host->h_lock); + res = __nlm_find_lockowner(host, owner); + if (res == NULL && new != NULL) { + res = new; + atomic_set(&new->count, 1); + new->owner = owner; + new->pid = __nlm_alloc_pid(host); + new->host = nlm_get_host(host); + list_add(&new->list, &host->h_lockowners); + new = NULL; + } + } + spin_unlock(&host->h_lock); + if (new != NULL) + kfree(new); + return res; +} + +/* + * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls + */ +static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl) +{ + struct nlm_args *argp = &req->a_args; + struct nlm_lock *lock = &argp->lock; + + nlmclnt_next_cookie(&argp->cookie); + argp->state = nsm_local_state; + memcpy(&lock->fh, NFS_FH(fl->fl_file->f_dentry->d_inode), sizeof(struct nfs_fh)); + lock->caller = system_utsname.nodename; + lock->oh.data = req->a_owner; + lock->oh.len = sprintf(req->a_owner, "%d@%s", + current->pid, system_utsname.nodename); + locks_copy_lock(&lock->fl, fl); +} + +static void nlmclnt_release_lockargs(struct nlm_rqst *req) +{ + struct file_lock *fl = &req->a_args.lock.fl; + + if (fl->fl_ops && fl->fl_ops->fl_release_private) + fl->fl_ops->fl_release_private(fl); +} + +/* + * Initialize arguments for GRANTED call. The nlm_rqst structure + * has been cleared already. + */ +int +nlmclnt_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock) +{ + locks_copy_lock(&call->a_args.lock.fl, &lock->fl); + memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh)); + call->a_args.lock.caller = system_utsname.nodename; + call->a_args.lock.oh.len = lock->oh.len; + + /* set default data area */ + call->a_args.lock.oh.data = call->a_owner; + + if (lock->oh.len > NLMCLNT_OHSIZE) { + void *data = kmalloc(lock->oh.len, GFP_KERNEL); + if (!data) { + nlmclnt_freegrantargs(call); + return 0; + } + call->a_args.lock.oh.data = (u8 *) data; + } + + memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len); + return 1; +} + +void +nlmclnt_freegrantargs(struct nlm_rqst *call) +{ + struct file_lock *fl = &call->a_args.lock.fl; + /* + * Check whether we allocated memory for the owner. + */ + if (call->a_args.lock.oh.data != (u8 *) call->a_owner) { + kfree(call->a_args.lock.oh.data); + } + if (fl->fl_ops && fl->fl_ops->fl_release_private) + fl->fl_ops->fl_release_private(fl); +} + +/* + * This is the main entry point for the NLM client. + */ +int +nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl) +{ + struct nfs_server *nfssrv = NFS_SERVER(inode); + struct nlm_host *host; + struct nlm_rqst reqst, *call = &reqst; + sigset_t oldset; + unsigned long flags; + int status, proto, vers; + + vers = (NFS_PROTO(inode)->version == 3) ? 4 : 1; + if (NFS_PROTO(inode)->version > 3) { + printk(KERN_NOTICE "NFSv4 file locking not implemented!\n"); + return -ENOLCK; + } + + /* Retrieve transport protocol from NFS client */ + proto = NFS_CLIENT(inode)->cl_xprt->prot; + + if (!(host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers))) + return -ENOLCK; + + /* Create RPC client handle if not there, and copy soft + * and intr flags from NFS client. */ + if (host->h_rpcclnt == NULL) { + struct rpc_clnt *clnt; + + /* Bind an rpc client to this host handle (does not + * perform a portmapper lookup) */ + if (!(clnt = nlm_bind_host(host))) { + status = -ENOLCK; + goto done; + } + clnt->cl_softrtry = nfssrv->client->cl_softrtry; + clnt->cl_intr = nfssrv->client->cl_intr; + clnt->cl_chatty = nfssrv->client->cl_chatty; + } + + /* Keep the old signal mask */ + spin_lock_irqsave(¤t->sighand->siglock, flags); + oldset = current->blocked; + + /* If we're cleaning up locks because the process is exiting, + * perform the RPC call asynchronously. */ + if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) + && fl->fl_type == F_UNLCK + && (current->flags & PF_EXITING)) { + sigfillset(¤t->blocked); /* Mask all signals */ + recalc_sigpending(); + spin_unlock_irqrestore(¤t->sighand->siglock, flags); + + call = nlmclnt_alloc_call(); + if (!call) { + status = -ENOMEM; + goto out_restore; + } + call->a_flags = RPC_TASK_ASYNC; + } else { + spin_unlock_irqrestore(¤t->sighand->siglock, flags); + memset(call, 0, sizeof(*call)); + locks_init_lock(&call->a_args.lock.fl); + locks_init_lock(&call->a_res.lock.fl); + } + call->a_host = host; + + nlmclnt_locks_init_private(fl, host); + + /* Set up the argument struct */ + nlmclnt_setlockargs(call, fl); + + if (IS_SETLK(cmd) || IS_SETLKW(cmd)) { + if (fl->fl_type != F_UNLCK) { + call->a_args.block = IS_SETLKW(cmd) ? 1 : 0; + status = nlmclnt_lock(call, fl); + } else + status = nlmclnt_unlock(call, fl); + } else if (IS_GETLK(cmd)) + status = nlmclnt_test(call, fl); + else + status = -EINVAL; + + out_restore: + spin_lock_irqsave(¤t->sighand->siglock, flags); + current->blocked = oldset; + recalc_sigpending(); + spin_unlock_irqrestore(¤t->sighand->siglock, flags); + +done: + dprintk("lockd: clnt proc returns %d\n", status); + nlm_release_host(host); + return status; +} +EXPORT_SYMBOL(nlmclnt_proc); + +/* + * Allocate an NLM RPC call struct + */ +struct nlm_rqst * +nlmclnt_alloc_call(void) +{ + struct nlm_rqst *call; + + while (!signalled()) { + call = (struct nlm_rqst *) kmalloc(sizeof(struct nlm_rqst), GFP_KERNEL); + if (call) { + memset(call, 0, sizeof(*call)); + locks_init_lock(&call->a_args.lock.fl); + locks_init_lock(&call->a_res.lock.fl); + return call; + } + printk("nlmclnt_alloc_call: failed, waiting for memory\n"); + current->state = TASK_INTERRUPTIBLE; + schedule_timeout(5*HZ); + } + return NULL; +} + +static int nlm_wait_on_grace(wait_queue_head_t *queue) +{ + DEFINE_WAIT(wait); + int status = -EINTR; + + prepare_to_wait(queue, &wait, TASK_INTERRUPTIBLE); + if (!signalled ()) { + schedule_timeout(NLMCLNT_GRACE_WAIT); + try_to_freeze(PF_FREEZE); + if (!signalled ()) + status = 0; + } + finish_wait(queue, &wait); + return status; +} + +/* + * Generic NLM call + */ +static int +nlmclnt_call(struct nlm_rqst *req, u32 proc) +{ + struct nlm_host *host = req->a_host; + struct rpc_clnt *clnt; + struct nlm_args *argp = &req->a_args; + struct nlm_res *resp = &req->a_res; + struct rpc_message msg = { + .rpc_argp = argp, + .rpc_resp = resp, + }; + int status; + + dprintk("lockd: call procedure %d on %s\n", + (int)proc, host->h_name); + + do { + if (host->h_reclaiming && !argp->reclaim) + goto in_grace_period; + + /* If we have no RPC client yet, create one. */ + if ((clnt = nlm_bind_host(host)) == NULL) + return -ENOLCK; + msg.rpc_proc = &clnt->cl_procinfo[proc]; + + /* Perform the RPC call. If an error occurs, try again */ + if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) { + dprintk("lockd: rpc_call returned error %d\n", -status); + switch (status) { + case -EPROTONOSUPPORT: + status = -EINVAL; + break; + case -ECONNREFUSED: + case -ETIMEDOUT: + case -ENOTCONN: + nlm_rebind_host(host); + status = -EAGAIN; + break; + case -ERESTARTSYS: + return signalled () ? -EINTR : status; + default: + break; + } + break; + } else + if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD) { + dprintk("lockd: server in grace period\n"); + if (argp->reclaim) { + printk(KERN_WARNING + "lockd: spurious grace period reject?!\n"); + return -ENOLCK; + } + } else { + if (!argp->reclaim) { + /* We appear to be out of the grace period */ + wake_up_all(&host->h_gracewait); + } + dprintk("lockd: server returns status %d\n", resp->status); + return 0; /* Okay, call complete */ + } + +in_grace_period: + /* + * The server has rebooted and appears to be in the grace + * period during which locks are only allowed to be + * reclaimed. + * We can only back off and try again later. + */ + status = nlm_wait_on_grace(&host->h_gracewait); + } while (status == 0); + + return status; +} + +/* + * Generic NLM call, async version. + */ +int +nlmsvc_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback) +{ + struct nlm_host *host = req->a_host; + struct rpc_clnt *clnt; + struct rpc_message msg = { + .rpc_argp = &req->a_args, + .rpc_resp = &req->a_res, + }; + int status; + + dprintk("lockd: call procedure %d on %s (async)\n", + (int)proc, host->h_name); + + /* If we have no RPC client yet, create one. */ + if ((clnt = nlm_bind_host(host)) == NULL) + return -ENOLCK; + msg.rpc_proc = &clnt->cl_procinfo[proc]; + + /* bootstrap and kick off the async RPC call */ + status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req); + + return status; +} + +static int +nlmclnt_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback) +{ + struct nlm_host *host = req->a_host; + struct rpc_clnt *clnt; + struct nlm_args *argp = &req->a_args; + struct nlm_res *resp = &req->a_res; + struct rpc_message msg = { + .rpc_argp = argp, + .rpc_resp = resp, + }; + int status; + + dprintk("lockd: call procedure %d on %s (async)\n", + (int)proc, host->h_name); + + /* If we have no RPC client yet, create one. */ + if ((clnt = nlm_bind_host(host)) == NULL) + return -ENOLCK; + msg.rpc_proc = &clnt->cl_procinfo[proc]; + + /* Increment host refcount */ + nlm_get_host(host); + /* bootstrap and kick off the async RPC call */ + status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req); + if (status < 0) + nlm_release_host(host); + return status; +} + +/* + * TEST for the presence of a conflicting lock + */ +static int +nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl) +{ + int status; + + status = nlmclnt_call(req, NLMPROC_TEST); + nlmclnt_release_lockargs(req); + if (status < 0) + return status; + + status = req->a_res.status; + if (status == NLM_LCK_GRANTED) { + fl->fl_type = F_UNLCK; + } if (status == NLM_LCK_DENIED) { + /* + * Report the conflicting lock back to the application. + */ + locks_copy_lock(fl, &req->a_res.lock.fl); + fl->fl_pid = 0; + } else { + return nlm_stat_to_errno(req->a_res.status); + } + + return 0; +} + +static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl) +{ + memcpy(&new->fl_u.nfs_fl, &fl->fl_u.nfs_fl, sizeof(new->fl_u.nfs_fl)); + nlm_get_lockowner(new->fl_u.nfs_fl.owner); +} + +static void nlmclnt_locks_release_private(struct file_lock *fl) +{ + nlm_put_lockowner(fl->fl_u.nfs_fl.owner); + fl->fl_ops = NULL; +} + +static struct file_lock_operations nlmclnt_lock_ops = { + .fl_copy_lock = nlmclnt_locks_copy_lock, + .fl_release_private = nlmclnt_locks_release_private, +}; + +static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host) +{ + BUG_ON(fl->fl_ops != NULL); + fl->fl_u.nfs_fl.state = 0; + fl->fl_u.nfs_fl.flags = 0; + fl->fl_u.nfs_fl.owner = nlm_find_lockowner(host, fl->fl_owner); + fl->fl_ops = &nlmclnt_lock_ops; +} + +static void do_vfs_lock(struct file_lock *fl) +{ + int res = 0; + switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { + case FL_POSIX: + res = posix_lock_file_wait(fl->fl_file, fl); + break; + case FL_FLOCK: + res = flock_lock_file_wait(fl->fl_file, fl); + break; + default: + BUG(); + } + if (res < 0) + printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", + __FUNCTION__); +} + +/* + * LOCK: Try to create a lock + * + * Programmer Harassment Alert + * + * When given a blocking lock request in a sync RPC call, the HPUX lockd + * will faithfully return LCK_BLOCKED but never cares to notify us when + * the lock could be granted. This way, our local process could hang + * around forever waiting for the callback. + * + * Solution A: Implement busy-waiting + * Solution B: Use the async version of the call (NLM_LOCK_{MSG,RES}) + * + * For now I am implementing solution A, because I hate the idea of + * re-implementing lockd for a third time in two months. The async + * calls shouldn't be too hard to do, however. + * + * This is one of the lovely things about standards in the NFS area: + * they're so soft and squishy you can't really blame HP for doing this. + */ +static int +nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl) +{ + struct nlm_host *host = req->a_host; + struct nlm_res *resp = &req->a_res; + int status; + + if (!host->h_monitored && nsm_monitor(host) < 0) { + printk(KERN_NOTICE "lockd: failed to monitor %s\n", + host->h_name); + status = -ENOLCK; + goto out; + } + + do { + if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0) { + if (resp->status != NLM_LCK_BLOCKED) + break; + status = nlmclnt_block(host, fl, &resp->status); + } + if (status < 0) + goto out; + } while (resp->status == NLM_LCK_BLOCKED && req->a_args.block); + + if (resp->status == NLM_LCK_GRANTED) { + fl->fl_u.nfs_fl.state = host->h_state; + fl->fl_u.nfs_fl.flags |= NFS_LCK_GRANTED; + fl->fl_flags |= FL_SLEEP; + do_vfs_lock(fl); + } + status = nlm_stat_to_errno(resp->status); +out: + nlmclnt_release_lockargs(req); + return status; +} + +/* + * RECLAIM: Try to reclaim a lock + */ +int +nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl) +{ + struct nlm_rqst reqst, *req; + int status; + + req = &reqst; + memset(req, 0, sizeof(*req)); + locks_init_lock(&req->a_args.lock.fl); + locks_init_lock(&req->a_res.lock.fl); + req->a_host = host; + req->a_flags = 0; + + /* Set up the argument struct */ + nlmclnt_setlockargs(req, fl); + req->a_args.reclaim = 1; + + if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0 + && req->a_res.status == NLM_LCK_GRANTED) + return 0; + + printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d " + "(errno %d, status %d)\n", fl->fl_pid, + status, req->a_res.status); + + /* + * FIXME: This is a serious failure. We can + * + * a. Ignore the problem + * b. Send the owning process some signal (Linux doesn't have + * SIGLOST, though...) + * c. Retry the operation + * + * Until someone comes up with a simple implementation + * for b or c, I'll choose option a. + */ + + return -ENOLCK; +} + +/* + * UNLOCK: remove an existing lock + */ +static int +nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl) +{ + struct nlm_res *resp = &req->a_res; + int status; + + /* Clean the GRANTED flag now so the lock doesn't get + * reclaimed while we're stuck in the unlock call. */ + fl->fl_u.nfs_fl.flags &= ~NFS_LCK_GRANTED; + + if (req->a_flags & RPC_TASK_ASYNC) { + status = nlmclnt_async_call(req, NLMPROC_UNLOCK, + nlmclnt_unlock_callback); + /* Hrmf... Do the unlock early since locks_remove_posix() + * really expects us to free the lock synchronously */ + do_vfs_lock(fl); + if (status < 0) { + nlmclnt_release_lockargs(req); + kfree(req); + } + return status; + } + + status = nlmclnt_call(req, NLMPROC_UNLOCK); + nlmclnt_release_lockargs(req); + if (status < 0) + return status; + + do_vfs_lock(fl); + if (resp->status == NLM_LCK_GRANTED) + return 0; + + if (resp->status != NLM_LCK_DENIED_NOLOCKS) + printk("lockd: unexpected unlock status: %d\n", resp->status); + + /* What to do now? I'm out of my depth... */ + + return -ENOLCK; +} + +static void +nlmclnt_unlock_callback(struct rpc_task *task) +{ + struct nlm_rqst *req = (struct nlm_rqst *) task->tk_calldata; + int status = req->a_res.status; + + if (RPC_ASSASSINATED(task)) + goto die; + + if (task->tk_status < 0) { + dprintk("lockd: unlock failed (err = %d)\n", -task->tk_status); + goto retry_rebind; + } + if (status == NLM_LCK_DENIED_GRACE_PERIOD) { + rpc_delay(task, NLMCLNT_GRACE_WAIT); + goto retry_unlock; + } + if (status != NLM_LCK_GRANTED) + printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status); +die: + nlm_release_host(req->a_host); + nlmclnt_release_lockargs(req); + kfree(req); + return; + retry_rebind: + nlm_rebind_host(req->a_host); + retry_unlock: + rpc_restart_call(task); +} + +/* + * Cancel a blocked lock request. + * We always use an async RPC call for this in order not to hang a + * process that has been Ctrl-C'ed. + */ +int +nlmclnt_cancel(struct nlm_host *host, struct file_lock *fl) +{ + struct nlm_rqst *req; + unsigned long flags; + sigset_t oldset; + int status; + + /* Block all signals while setting up call */ + spin_lock_irqsave(¤t->sighand->siglock, flags); + oldset = current->blocked; + sigfillset(¤t->blocked); + recalc_sigpending(); + spin_unlock_irqrestore(¤t->sighand->siglock, flags); + + req = nlmclnt_alloc_call(); + if (!req) + return -ENOMEM; + req->a_host = host; + req->a_flags = RPC_TASK_ASYNC; + + nlmclnt_setlockargs(req, fl); + + status = nlmclnt_async_call(req, NLMPROC_CANCEL, + nlmclnt_cancel_callback); + if (status < 0) { + nlmclnt_release_lockargs(req); + kfree(req); + } + + spin_lock_irqsave(¤t->sighand->siglock, flags); + current->blocked = oldset; + recalc_sigpending(); + spin_unlock_irqrestore(¤t->sighand->siglock, flags); + + return status; +} + +static void +nlmclnt_cancel_callback(struct rpc_task *task) +{ + struct nlm_rqst *req = (struct nlm_rqst *) task->tk_calldata; + + if (RPC_ASSASSINATED(task)) + goto die; + + if (task->tk_status < 0) { + dprintk("lockd: CANCEL call error %d, retrying.\n", + task->tk_status); + goto retry_cancel; + } + + dprintk("lockd: cancel status %d (task %d)\n", + req->a_res.status, task->tk_pid); + + switch (req->a_res.status) { + case NLM_LCK_GRANTED: + case NLM_LCK_DENIED_GRACE_PERIOD: + /* Everything's good */ + break; + case NLM_LCK_DENIED_NOLOCKS: + dprintk("lockd: CANCEL failed (server has no locks)\n"); + goto retry_cancel; + default: + printk(KERN_NOTICE "lockd: weird return %d for CANCEL call\n", + req->a_res.status); + } + +die: + nlm_release_host(req->a_host); + nlmclnt_release_lockargs(req); + kfree(req); + return; + +retry_cancel: + nlm_rebind_host(req->a_host); + rpc_restart_call(task); + rpc_delay(task, 30 * HZ); +} + +/* + * Convert an NLM status code to a generic kernel errno + */ +static int +nlm_stat_to_errno(u32 status) +{ + switch(status) { + case NLM_LCK_GRANTED: + return 0; + case NLM_LCK_DENIED: + return -EAGAIN; + case NLM_LCK_DENIED_NOLOCKS: + case NLM_LCK_DENIED_GRACE_PERIOD: + return -ENOLCK; + case NLM_LCK_BLOCKED: + printk(KERN_NOTICE "lockd: unexpected status NLM_BLOCKED\n"); + return -ENOLCK; +#ifdef CONFIG_LOCKD_V4 + case NLM_DEADLCK: + return -EDEADLK; + case NLM_ROFS: + return -EROFS; + case NLM_STALE_FH: + return -ESTALE; + case NLM_FBIG: + return -EOVERFLOW; + case NLM_FAILED: + return -ENOLCK; +#endif + } + printk(KERN_NOTICE "lockd: unexpected server status %d\n", status); + return -ENOLCK; +} diff --git a/fs/lockd/host.c b/fs/lockd/host.c new file mode 100644 index 0000000..52707c5 --- /dev/null +++ b/fs/lockd/host.c @@ -0,0 +1,346 @@ +/* + * linux/fs/lockd/host.c + * + * Management for NLM peer hosts. The nlm_host struct is shared + * between client and server implementation. The only reason to + * do so is to reduce code bloat. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/in.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/sm_inter.h> + + +#define NLMDBG_FACILITY NLMDBG_HOSTCACHE +#define NLM_HOST_MAX 64 +#define NLM_HOST_NRHASH 32 +#define NLM_ADDRHASH(addr) (ntohl(addr) & (NLM_HOST_NRHASH-1)) +#define NLM_HOST_REBIND (60 * HZ) +#define NLM_HOST_EXPIRE ((nrhosts > NLM_HOST_MAX)? 300 * HZ : 120 * HZ) +#define NLM_HOST_COLLECT ((nrhosts > NLM_HOST_MAX)? 120 * HZ : 60 * HZ) +#define NLM_HOST_ADDR(sv) (&(sv)->s_nlmclnt->cl_xprt->addr) + +static struct nlm_host * nlm_hosts[NLM_HOST_NRHASH]; +static unsigned long next_gc; +static int nrhosts; +static DECLARE_MUTEX(nlm_host_sema); + + +static void nlm_gc_hosts(void); + +/* + * Find an NLM server handle in the cache. If there is none, create it. + */ +struct nlm_host * +nlmclnt_lookup_host(struct sockaddr_in *sin, int proto, int version) +{ + return nlm_lookup_host(0, sin, proto, version); +} + +/* + * Find an NLM client handle in the cache. If there is none, create it. + */ +struct nlm_host * +nlmsvc_lookup_host(struct svc_rqst *rqstp) +{ + return nlm_lookup_host(1, &rqstp->rq_addr, + rqstp->rq_prot, rqstp->rq_vers); +} + +/* + * Common host lookup routine for server & client + */ +struct nlm_host * +nlm_lookup_host(int server, struct sockaddr_in *sin, + int proto, int version) +{ + struct nlm_host *host, **hp; + u32 addr; + int hash; + + dprintk("lockd: nlm_lookup_host(%08x, p=%d, v=%d)\n", + (unsigned)(sin? ntohl(sin->sin_addr.s_addr) : 0), proto, version); + + hash = NLM_ADDRHASH(sin->sin_addr.s_addr); + + /* Lock hash table */ + down(&nlm_host_sema); + + if (time_after_eq(jiffies, next_gc)) + nlm_gc_hosts(); + + for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) { + if (host->h_proto != proto) + continue; + if (host->h_version != version) + continue; + if (host->h_server != server) + continue; + + if (nlm_cmp_addr(&host->h_addr, sin)) { + if (hp != nlm_hosts + hash) { + *hp = host->h_next; + host->h_next = nlm_hosts[hash]; + nlm_hosts[hash] = host; + } + nlm_get_host(host); + up(&nlm_host_sema); + return host; + } + } + + /* Ooops, no host found, create it */ + dprintk("lockd: creating host entry\n"); + + if (!(host = (struct nlm_host *) kmalloc(sizeof(*host), GFP_KERNEL))) + goto nohost; + memset(host, 0, sizeof(*host)); + + addr = sin->sin_addr.s_addr; + sprintf(host->h_name, "%u.%u.%u.%u", NIPQUAD(addr)); + + host->h_addr = *sin; + host->h_addr.sin_port = 0; /* ouch! */ + host->h_version = version; + host->h_proto = proto; + host->h_rpcclnt = NULL; + init_MUTEX(&host->h_sema); + host->h_nextrebind = jiffies + NLM_HOST_REBIND; + host->h_expires = jiffies + NLM_HOST_EXPIRE; + atomic_set(&host->h_count, 1); + init_waitqueue_head(&host->h_gracewait); + host->h_state = 0; /* pseudo NSM state */ + host->h_nsmstate = 0; /* real NSM state */ + host->h_server = server; + host->h_next = nlm_hosts[hash]; + nlm_hosts[hash] = host; + INIT_LIST_HEAD(&host->h_lockowners); + spin_lock_init(&host->h_lock); + + if (++nrhosts > NLM_HOST_MAX) + next_gc = 0; + +nohost: + up(&nlm_host_sema); + return host; +} + +struct nlm_host * +nlm_find_client(void) +{ + /* find a nlm_host for a client for which h_killed == 0. + * and return it + */ + int hash; + down(&nlm_host_sema); + for (hash = 0 ; hash < NLM_HOST_NRHASH; hash++) { + struct nlm_host *host, **hp; + for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) { + if (host->h_server && + host->h_killed == 0) { + nlm_get_host(host); + up(&nlm_host_sema); + return host; + } + } + } + up(&nlm_host_sema); + return NULL; +} + + +/* + * Create the NLM RPC client for an NLM peer + */ +struct rpc_clnt * +nlm_bind_host(struct nlm_host *host) +{ + struct rpc_clnt *clnt; + struct rpc_xprt *xprt; + + dprintk("lockd: nlm_bind_host(%08x)\n", + (unsigned)ntohl(host->h_addr.sin_addr.s_addr)); + + /* Lock host handle */ + down(&host->h_sema); + + /* If we've already created an RPC client, check whether + * RPC rebind is required + * Note: why keep rebinding if we're on a tcp connection? + */ + if ((clnt = host->h_rpcclnt) != NULL) { + xprt = clnt->cl_xprt; + if (!xprt->stream && time_after_eq(jiffies, host->h_nextrebind)) { + clnt->cl_port = 0; + host->h_nextrebind = jiffies + NLM_HOST_REBIND; + dprintk("lockd: next rebind in %ld jiffies\n", + host->h_nextrebind - jiffies); + } + } else { + xprt = xprt_create_proto(host->h_proto, &host->h_addr, NULL); + if (IS_ERR(xprt)) + goto forgetit; + + xprt_set_timeout(&xprt->timeout, 5, nlmsvc_timeout); + + /* Existing NLM servers accept AUTH_UNIX only */ + clnt = rpc_create_client(xprt, host->h_name, &nlm_program, + host->h_version, RPC_AUTH_UNIX); + if (IS_ERR(clnt)) { + xprt_destroy(xprt); + goto forgetit; + } + clnt->cl_autobind = 1; /* turn on pmap queries */ + xprt->nocong = 1; /* No congestion control for NLM */ + xprt->resvport = 1; /* NLM requires a reserved port */ + + host->h_rpcclnt = clnt; + } + + up(&host->h_sema); + return clnt; + +forgetit: + printk("lockd: couldn't create RPC handle for %s\n", host->h_name); + up(&host->h_sema); + return NULL; +} + +/* + * Force a portmap lookup of the remote lockd port + */ +void +nlm_rebind_host(struct nlm_host *host) +{ + dprintk("lockd: rebind host %s\n", host->h_name); + if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { + host->h_rpcclnt->cl_port = 0; + host->h_nextrebind = jiffies + NLM_HOST_REBIND; + } +} + +/* + * Increment NLM host count + */ +struct nlm_host * nlm_get_host(struct nlm_host *host) +{ + if (host) { + dprintk("lockd: get host %s\n", host->h_name); + atomic_inc(&host->h_count); + host->h_expires = jiffies + NLM_HOST_EXPIRE; + } + return host; +} + +/* + * Release NLM host after use + */ +void nlm_release_host(struct nlm_host *host) +{ + if (host != NULL) { + dprintk("lockd: release host %s\n", host->h_name); + atomic_dec(&host->h_count); + BUG_ON(atomic_read(&host->h_count) < 0); + } +} + +/* + * Shut down the hosts module. + * Note that this routine is called only at server shutdown time. + */ +void +nlm_shutdown_hosts(void) +{ + struct nlm_host *host; + int i; + + dprintk("lockd: shutting down host module\n"); + down(&nlm_host_sema); + + /* First, make all hosts eligible for gc */ + dprintk("lockd: nuking all hosts...\n"); + for (i = 0; i < NLM_HOST_NRHASH; i++) { + for (host = nlm_hosts[i]; host; host = host->h_next) + host->h_expires = jiffies - 1; + } + + /* Then, perform a garbage collection pass */ + nlm_gc_hosts(); + up(&nlm_host_sema); + + /* complain if any hosts are left */ + if (nrhosts) { + printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); + dprintk("lockd: %d hosts left:\n", nrhosts); + for (i = 0; i < NLM_HOST_NRHASH; i++) { + for (host = nlm_hosts[i]; host; host = host->h_next) { + dprintk(" %s (cnt %d use %d exp %ld)\n", + host->h_name, atomic_read(&host->h_count), + host->h_inuse, host->h_expires); + } + } + } +} + +/* + * Garbage collect any unused NLM hosts. + * This GC combines reference counting for async operations with + * mark & sweep for resources held by remote clients. + */ +static void +nlm_gc_hosts(void) +{ + struct nlm_host **q, *host; + struct rpc_clnt *clnt; + int i; + + dprintk("lockd: host garbage collection\n"); + for (i = 0; i < NLM_HOST_NRHASH; i++) { + for (host = nlm_hosts[i]; host; host = host->h_next) + host->h_inuse = 0; + } + + /* Mark all hosts that hold locks, blocks or shares */ + nlmsvc_mark_resources(); + + for (i = 0; i < NLM_HOST_NRHASH; i++) { + q = &nlm_hosts[i]; + while ((host = *q) != NULL) { + if (atomic_read(&host->h_count) || host->h_inuse + || time_before(jiffies, host->h_expires)) { + dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n", + host->h_name, atomic_read(&host->h_count), + host->h_inuse, host->h_expires); + q = &host->h_next; + continue; + } + dprintk("lockd: delete host %s\n", host->h_name); + *q = host->h_next; + /* Don't unmonitor hosts that have been invalidated */ + if (host->h_monitored && !host->h_killed) + nsm_unmonitor(host); + if ((clnt = host->h_rpcclnt) != NULL) { + if (atomic_read(&clnt->cl_users)) { + printk(KERN_WARNING + "lockd: active RPC handle\n"); + clnt->cl_dead = 1; + } else { + rpc_destroy_client(host->h_rpcclnt); + } + } + BUG_ON(!list_empty(&host->h_lockowners)); + kfree(host); + nrhosts--; + } + } + + next_gc = jiffies + NLM_HOST_COLLECT; +} + diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c new file mode 100644 index 0000000..6fc1beb --- /dev/null +++ b/fs/lockd/mon.c @@ -0,0 +1,246 @@ +/* + * linux/fs/lockd/mon.c + * + * The kernel statd client. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/types.h> +#include <linux/utsname.h> +#include <linux/kernel.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/sm_inter.h> + + +#define NLMDBG_FACILITY NLMDBG_MONITOR + +static struct rpc_clnt * nsm_create(void); + +static struct rpc_program nsm_program; + +/* + * Local NSM state + */ +u32 nsm_local_state; + +/* + * Common procedure for SM_MON/SM_UNMON calls + */ +static int +nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res) +{ + struct rpc_clnt *clnt; + int status; + struct nsm_args args; + + clnt = nsm_create(); + if (IS_ERR(clnt)) { + status = PTR_ERR(clnt); + goto out; + } + + args.addr = host->h_addr.sin_addr.s_addr; + args.proto= (host->h_proto<<1) | host->h_server; + args.prog = NLM_PROGRAM; + args.vers = host->h_version; + args.proc = NLMPROC_NSM_NOTIFY; + memset(res, 0, sizeof(*res)); + + status = rpc_call(clnt, proc, &args, res, 0); + if (status < 0) + printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n", + status); + else + status = 0; + out: + return status; +} + +/* + * Set up monitoring of a remote host + */ +int +nsm_monitor(struct nlm_host *host) +{ + struct nsm_res res; + int status; + + dprintk("lockd: nsm_monitor(%s)\n", host->h_name); + + status = nsm_mon_unmon(host, SM_MON, &res); + + if (status < 0 || res.status != 0) + printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name); + else + host->h_monitored = 1; + return status; +} + +/* + * Cease to monitor remote host + */ +int +nsm_unmonitor(struct nlm_host *host) +{ + struct nsm_res res; + int status; + + dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name); + + status = nsm_mon_unmon(host, SM_UNMON, &res); + if (status < 0) + printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name); + else + host->h_monitored = 0; + return status; +} + +/* + * Create NSM client for the local host + */ +static struct rpc_clnt * +nsm_create(void) +{ + struct rpc_xprt *xprt; + struct rpc_clnt *clnt; + struct sockaddr_in sin; + + sin.sin_family = AF_INET; + sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); + sin.sin_port = 0; + + xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL); + if (IS_ERR(xprt)) + return (struct rpc_clnt *)xprt; + + clnt = rpc_create_client(xprt, "localhost", + &nsm_program, SM_VERSION, + RPC_AUTH_NULL); + if (IS_ERR(clnt)) + goto out_destroy; + clnt->cl_softrtry = 1; + clnt->cl_chatty = 1; + clnt->cl_oneshot = 1; + xprt->resvport = 1; /* NSM requires a reserved port */ + return clnt; + +out_destroy: + xprt_destroy(xprt); + return clnt; +} + +/* + * XDR functions for NSM. + */ + +static u32 * +xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) +{ + char buffer[20]; + + /* + * Use the dotted-quad IP address of the remote host as + * identifier. Linux statd always looks up the canonical + * hostname first for whatever remote hostname it receives, + * so this works alright. + */ + sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); + if (!(p = xdr_encode_string(p, buffer)) + || !(p = xdr_encode_string(p, system_utsname.nodename))) + return ERR_PTR(-EIO); + *p++ = htonl(argp->prog); + *p++ = htonl(argp->vers); + *p++ = htonl(argp->proc); + + return p; +} + +static int +xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) +{ + p = xdr_encode_common(rqstp, p, argp); + if (IS_ERR(p)) + return PTR_ERR(p); + *p++ = argp->addr; + *p++ = argp->vers; + *p++ = argp->proto; + *p++ = 0; + rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); + return 0; +} + +static int +xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) +{ + p = xdr_encode_common(rqstp, p, argp); + if (IS_ERR(p)) + return PTR_ERR(p); + rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); + return 0; +} + +static int +xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) +{ + resp->status = ntohl(*p++); + resp->state = ntohl(*p++); + dprintk("nsm: xdr_decode_stat_res status %d state %d\n", + resp->status, resp->state); + return 0; +} + +static int +xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) +{ + resp->state = ntohl(*p++); + return 0; +} + +#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) +#define SM_my_id_sz (3+1+SM_my_name_sz) +#define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz) +#define SM_mon_sz (SM_mon_id_sz+4) +#define SM_monres_sz 2 +#define SM_unmonres_sz 1 + +#ifndef MAX +# define MAX(a, b) (((a) > (b))? (a) : (b)) +#endif + +static struct rpc_procinfo nsm_procedures[] = { +[SM_MON] = { + .p_proc = SM_MON, + .p_encode = (kxdrproc_t) xdr_encode_mon, + .p_decode = (kxdrproc_t) xdr_decode_stat_res, + .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2, + }, +[SM_UNMON] = { + .p_proc = SM_UNMON, + .p_encode = (kxdrproc_t) xdr_encode_unmon, + .p_decode = (kxdrproc_t) xdr_decode_stat, + .p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2, + }, +}; + +static struct rpc_version nsm_version1 = { + .number = 1, + .nrprocs = sizeof(nsm_procedures)/sizeof(nsm_procedures[0]), + .procs = nsm_procedures +}; + +static struct rpc_version * nsm_version[] = { + [1] = &nsm_version1, +}; + +static struct rpc_stat nsm_stats; + +static struct rpc_program nsm_program = { + .name = "statd", + .number = SM_PROGRAM, + .nrvers = sizeof(nsm_version)/sizeof(nsm_version[0]), + .version = nsm_version, + .stats = &nsm_stats +}; diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c new file mode 100644 index 0000000..b82e470 --- /dev/null +++ b/fs/lockd/svc.c @@ -0,0 +1,519 @@ +/* + * linux/fs/lockd/svc.c + * + * This is the central lockd service. + * + * FIXME: Separate the lockd NFS server functionality from the lockd NFS + * client functionality. Oh why didn't Sun create two separate + * services in the first place? + * + * Authors: Olaf Kirch (okir@monad.swb.de) + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/moduleparam.h> + +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/in.h> +#include <linux/uio.h> +#include <linux/slab.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> + +#include <linux/sunrpc/types.h> +#include <linux/sunrpc/stats.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/sunrpc/svcsock.h> +#include <linux/lockd/lockd.h> +#include <linux/nfs.h> + +#define NLMDBG_FACILITY NLMDBG_SVC +#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE) +#define ALLOWED_SIGS (sigmask(SIGKILL)) + +static struct svc_program nlmsvc_program; + +struct nlmsvc_binding * nlmsvc_ops; +EXPORT_SYMBOL(nlmsvc_ops); + +static DECLARE_MUTEX(nlmsvc_sema); +static unsigned int nlmsvc_users; +static pid_t nlmsvc_pid; +int nlmsvc_grace_period; +unsigned long nlmsvc_timeout; + +static DECLARE_MUTEX_LOCKED(lockd_start); +static DECLARE_WAIT_QUEUE_HEAD(lockd_exit); + +/* + * These can be set at insmod time (useful for NFS as root filesystem), + * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003 + */ +static unsigned long nlm_grace_period; +static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO; +static int nlm_udpport, nlm_tcpport; + +/* + * Constants needed for the sysctl interface. + */ +static const unsigned long nlm_grace_period_min = 0; +static const unsigned long nlm_grace_period_max = 240; +static const unsigned long nlm_timeout_min = 3; +static const unsigned long nlm_timeout_max = 20; +static const int nlm_port_min = 0, nlm_port_max = 65535; + +static struct ctl_table_header * nlm_sysctl_table; + +static unsigned long set_grace_period(void) +{ + unsigned long grace_period; + + /* Note: nlm_timeout should always be nonzero */ + if (nlm_grace_period) + grace_period = ((nlm_grace_period + nlm_timeout - 1) + / nlm_timeout) * nlm_timeout * HZ; + else + grace_period = nlm_timeout * 5 * HZ; + nlmsvc_grace_period = 1; + return grace_period + jiffies; +} + +static inline void clear_grace_period(void) +{ + nlmsvc_grace_period = 0; +} + +/* + * This is the lockd kernel thread + */ +static void +lockd(struct svc_rqst *rqstp) +{ + struct svc_serv *serv = rqstp->rq_server; + int err = 0; + unsigned long grace_period_expire; + + /* Lock module and set up kernel thread */ + /* lockd_up is waiting for us to startup, so will + * be holding a reference to this module, so it + * is safe to just claim another reference + */ + __module_get(THIS_MODULE); + lock_kernel(); + + /* + * Let our maker know we're running. + */ + nlmsvc_pid = current->pid; + up(&lockd_start); + + daemonize("lockd"); + + /* Process request with signals blocked, but allow SIGKILL. */ + allow_signal(SIGKILL); + + /* kick rpciod */ + rpciod_up(); + + dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n"); + + if (!nlm_timeout) + nlm_timeout = LOCKD_DFLT_TIMEO; + nlmsvc_timeout = nlm_timeout * HZ; + + grace_period_expire = set_grace_period(); + + /* + * The main request loop. We don't terminate until the last + * NFS mount or NFS daemon has gone away, and we've been sent a + * signal, or else another process has taken over our job. + */ + while ((nlmsvc_users || !signalled()) && nlmsvc_pid == current->pid) { + long timeout = MAX_SCHEDULE_TIMEOUT; + + if (signalled()) { + flush_signals(current); + if (nlmsvc_ops) { + nlmsvc_invalidate_all(); + grace_period_expire = set_grace_period(); + } + } + + /* + * Retry any blocked locks that have been notified by + * the VFS. Don't do this during grace period. + * (Theoretically, there shouldn't even be blocked locks + * during grace period). + */ + if (!nlmsvc_grace_period) { + timeout = nlmsvc_retry_blocked(); + } else if (time_before(grace_period_expire, jiffies)) + clear_grace_period(); + + /* + * Find a socket with data available and call its + * recvfrom routine. + */ + err = svc_recv(serv, rqstp, timeout); + if (err == -EAGAIN || err == -EINTR) + continue; + if (err < 0) { + printk(KERN_WARNING + "lockd: terminating on error %d\n", + -err); + break; + } + + dprintk("lockd: request from %08x\n", + (unsigned)ntohl(rqstp->rq_addr.sin_addr.s_addr)); + + svc_process(serv, rqstp); + + } + + /* + * Check whether there's a new lockd process before + * shutting down the hosts and clearing the slot. + */ + if (!nlmsvc_pid || current->pid == nlmsvc_pid) { + if (nlmsvc_ops) + nlmsvc_invalidate_all(); + nlm_shutdown_hosts(); + nlmsvc_pid = 0; + } else + printk(KERN_DEBUG + "lockd: new process, skipping host shutdown\n"); + wake_up(&lockd_exit); + + /* Exit the RPC thread */ + svc_exit_thread(rqstp); + + /* release rpciod */ + rpciod_down(); + + /* Release module */ + unlock_kernel(); + module_put_and_exit(0); +} + +/* + * Bring up the lockd process if it's not already up. + */ +int +lockd_up(void) +{ + static int warned; + struct svc_serv * serv; + int error = 0; + + down(&nlmsvc_sema); + /* + * Unconditionally increment the user count ... this is + * the number of clients who _want_ a lockd process. + */ + nlmsvc_users++; + /* + * Check whether we're already up and running. + */ + if (nlmsvc_pid) + goto out; + + /* + * Sanity check: if there's no pid, + * we should be the first user ... + */ + if (nlmsvc_users > 1) + printk(KERN_WARNING + "lockd_up: no pid, %d users??\n", nlmsvc_users); + + error = -ENOMEM; + serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE); + if (!serv) { + printk(KERN_WARNING "lockd_up: create service failed\n"); + goto out; + } + + if ((error = svc_makesock(serv, IPPROTO_UDP, nlm_udpport)) < 0 +#ifdef CONFIG_NFSD_TCP + || (error = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport)) < 0 +#endif + ) { + if (warned++ == 0) + printk(KERN_WARNING + "lockd_up: makesock failed, error=%d\n", error); + goto destroy_and_out; + } + warned = 0; + + /* + * Create the kernel thread and wait for it to start. + */ + error = svc_create_thread(lockd, serv); + if (error) { + printk(KERN_WARNING + "lockd_up: create thread failed, error=%d\n", error); + goto destroy_and_out; + } + down(&lockd_start); + + /* + * Note: svc_serv structures have an initial use count of 1, + * so we exit through here on both success and failure. + */ +destroy_and_out: + svc_destroy(serv); +out: + up(&nlmsvc_sema); + return error; +} +EXPORT_SYMBOL(lockd_up); + +/* + * Decrement the user count and bring down lockd if we're the last. + */ +void +lockd_down(void) +{ + static int warned; + + down(&nlmsvc_sema); + if (nlmsvc_users) { + if (--nlmsvc_users) + goto out; + } else + printk(KERN_WARNING "lockd_down: no users! pid=%d\n", nlmsvc_pid); + + if (!nlmsvc_pid) { + if (warned++ == 0) + printk(KERN_WARNING "lockd_down: no lockd running.\n"); + goto out; + } + warned = 0; + + kill_proc(nlmsvc_pid, SIGKILL, 1); + /* + * Wait for the lockd process to exit, but since we're holding + * the lockd semaphore, we can't wait around forever ... + */ + clear_thread_flag(TIF_SIGPENDING); + interruptible_sleep_on_timeout(&lockd_exit, HZ); + if (nlmsvc_pid) { + printk(KERN_WARNING + "lockd_down: lockd failed to exit, clearing pid\n"); + nlmsvc_pid = 0; + } + spin_lock_irq(¤t->sighand->siglock); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); +out: + up(&nlmsvc_sema); +} +EXPORT_SYMBOL(lockd_down); + +/* + * Sysctl parameters (same as module parameters, different interface). + */ + +/* Something that isn't CTL_ANY, CTL_NONE or a value that may clash. */ +#define CTL_UNNUMBERED -2 + +static ctl_table nlm_sysctls[] = { + { + .ctl_name = CTL_UNNUMBERED, + .procname = "nlm_grace_period", + .data = &nlm_grace_period, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_doulongvec_minmax, + .extra1 = (unsigned long *) &nlm_grace_period_min, + .extra2 = (unsigned long *) &nlm_grace_period_max, + }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "nlm_timeout", + .data = &nlm_timeout, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_doulongvec_minmax, + .extra1 = (unsigned long *) &nlm_timeout_min, + .extra2 = (unsigned long *) &nlm_timeout_max, + }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "nlm_udpport", + .data = &nlm_udpport, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_minmax, + .extra1 = (int *) &nlm_port_min, + .extra2 = (int *) &nlm_port_max, + }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "nlm_tcpport", + .data = &nlm_tcpport, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_minmax, + .extra1 = (int *) &nlm_port_min, + .extra2 = (int *) &nlm_port_max, + }, + { .ctl_name = 0 } +}; + +static ctl_table nlm_sysctl_dir[] = { + { + .ctl_name = CTL_UNNUMBERED, + .procname = "nfs", + .mode = 0555, + .child = nlm_sysctls, + }, + { .ctl_name = 0 } +}; + +static ctl_table nlm_sysctl_root[] = { + { + .ctl_name = CTL_FS, + .procname = "fs", + .mode = 0555, + .child = nlm_sysctl_dir, + }, + { .ctl_name = 0 } +}; + +/* + * Module (and driverfs) parameters. + */ + +#define param_set_min_max(name, type, which_strtol, min, max) \ +static int param_set_##name(const char *val, struct kernel_param *kp) \ +{ \ + char *endp; \ + __typeof__(type) num = which_strtol(val, &endp, 0); \ + if (endp == val || *endp || num < (min) || num > (max)) \ + return -EINVAL; \ + *((int *) kp->arg) = num; \ + return 0; \ +} + +static inline int is_callback(u32 proc) +{ + return proc == NLMPROC_GRANTED + || proc == NLMPROC_GRANTED_MSG + || proc == NLMPROC_TEST_RES + || proc == NLMPROC_LOCK_RES + || proc == NLMPROC_CANCEL_RES + || proc == NLMPROC_UNLOCK_RES + || proc == NLMPROC_NSM_NOTIFY; +} + + +static int lockd_authenticate(struct svc_rqst *rqstp) +{ + rqstp->rq_client = NULL; + switch (rqstp->rq_authop->flavour) { + case RPC_AUTH_NULL: + case RPC_AUTH_UNIX: + if (rqstp->rq_proc == 0) + return SVC_OK; + if (is_callback(rqstp->rq_proc)) { + /* Leave it to individual procedures to + * call nlmsvc_lookup_host(rqstp) + */ + return SVC_OK; + } + return svc_set_client(rqstp); + } + return SVC_DENIED; +} + + +param_set_min_max(port, int, simple_strtol, 0, 65535) +param_set_min_max(grace_period, unsigned long, simple_strtoul, + nlm_grace_period_min, nlm_grace_period_max) +param_set_min_max(timeout, unsigned long, simple_strtoul, + nlm_timeout_min, nlm_timeout_max) + +MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); +MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION "."); +MODULE_LICENSE("GPL"); + +module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong, + &nlm_grace_period, 0644); +module_param_call(nlm_timeout, param_set_timeout, param_get_ulong, + &nlm_timeout, 0644); +module_param_call(nlm_udpport, param_set_port, param_get_int, + &nlm_udpport, 0644); +module_param_call(nlm_tcpport, param_set_port, param_get_int, + &nlm_tcpport, 0644); + +/* + * Initialising and terminating the module. + */ + +static int __init init_nlm(void) +{ + nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root, 0); + return nlm_sysctl_table ? 0 : -ENOMEM; +} + +static void __exit exit_nlm(void) +{ + /* FIXME: delete all NLM clients */ + nlm_shutdown_hosts(); + unregister_sysctl_table(nlm_sysctl_table); +} + +module_init(init_nlm); +module_exit(exit_nlm); + +/* + * Define NLM program and procedures + */ +static struct svc_version nlmsvc_version1 = { + .vs_vers = 1, + .vs_nproc = 17, + .vs_proc = nlmsvc_procedures, + .vs_xdrsize = NLMSVC_XDRSIZE, +}; +static struct svc_version nlmsvc_version3 = { + .vs_vers = 3, + .vs_nproc = 24, + .vs_proc = nlmsvc_procedures, + .vs_xdrsize = NLMSVC_XDRSIZE, +}; +#ifdef CONFIG_LOCKD_V4 +static struct svc_version nlmsvc_version4 = { + .vs_vers = 4, + .vs_nproc = 24, + .vs_proc = nlmsvc_procedures4, + .vs_xdrsize = NLMSVC_XDRSIZE, +}; +#endif +static struct svc_version * nlmsvc_version[] = { + [1] = &nlmsvc_version1, + [3] = &nlmsvc_version3, +#ifdef CONFIG_LOCKD_V4 + [4] = &nlmsvc_version4, +#endif +}; + +static struct svc_stat nlmsvc_stats; + +#define NLM_NRVERS (sizeof(nlmsvc_version)/sizeof(nlmsvc_version[0])) +static struct svc_program nlmsvc_program = { + .pg_prog = NLM_PROGRAM, /* program number */ + .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */ + .pg_vers = nlmsvc_version, /* version table */ + .pg_name = "lockd", /* service name */ + .pg_class = "nfsd", /* share authentication with nfsd */ + .pg_stats = &nlmsvc_stats, /* stats table */ + .pg_authenticate = &lockd_authenticate /* export authentication */ +}; diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c new file mode 100644 index 0000000..489670e --- /dev/null +++ b/fs/lockd/svc4proc.c @@ -0,0 +1,580 @@ +/* + * linux/fs/lockd/svc4proc.c + * + * Lockd server procedures. We don't implement the NLM_*_RES + * procedures because we don't use the async procedures. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/types.h> +#include <linux/time.h> +#include <linux/slab.h> +#include <linux/in.h> +#include <linux/sunrpc/svc.h> +#include <linux/sunrpc/clnt.h> +#include <linux/nfsd/nfsd.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/share.h> +#include <linux/lockd/sm_inter.h> + + +#define NLMDBG_FACILITY NLMDBG_CLIENT + +static u32 nlm4svc_callback(struct svc_rqst *, u32, struct nlm_res *); +static void nlm4svc_callback_exit(struct rpc_task *); + +/* + * Obtain client and file from arguments + */ +static u32 +nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_host **hostp, struct nlm_file **filp) +{ + struct nlm_host *host = NULL; + struct nlm_file *file = NULL; + struct nlm_lock *lock = &argp->lock; + u32 error = 0; + + /* nfsd callbacks must have been installed for this procedure */ + if (!nlmsvc_ops) + return nlm_lck_denied_nolocks; + + /* Obtain host handle */ + if (!(host = nlmsvc_lookup_host(rqstp)) + || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0)) + goto no_locks; + *hostp = host; + + /* Obtain file pointer. Not used by FREE_ALL call. */ + if (filp != NULL) { + if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) + goto no_locks; + *filp = file; + + /* Set up the missing parts of the file_lock structure */ + lock->fl.fl_file = file->f_file; + lock->fl.fl_owner = (fl_owner_t) host; + lock->fl.fl_lmops = &nlmsvc_lock_operations; + } + + return 0; + +no_locks: + if (host) + nlm_release_host(host); + if (error) + return error; + return nlm_lck_denied_nolocks; +} + +/* + * NULL: Test for presence of service + */ +static int +nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) +{ + dprintk("lockd: NULL called\n"); + return rpc_success; +} + +/* + * TEST: Check for conflicting lock + */ +static int +nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: TEST4 called\n"); + resp->cookie = argp->cookie; + + /* Don't accept test requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now check for conflicting locks */ + resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock); + + dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +static int +nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: LOCK called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept new lock requests during grace period */ + if (nlmsvc_grace_period && !argp->reclaim) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + +#if 0 + /* If supplied state doesn't match current state, we assume it's + * an old request that time-warped somehow. Any error return would + * do in this case because it's irrelevant anyway. + * + * NB: We don't retrieve the remote host's state yet. + */ + if (host->h_nsmstate && host->h_nsmstate != argp->state) { + resp->status = nlm_lck_denied_nolocks; + } else +#endif + + /* Now try to lock the file */ + resp->status = nlmsvc_lock(rqstp, file, &argp->lock, + argp->block, &argp->cookie); + + dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +static int +nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: CANCEL called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Try to cancel request. */ + resp->status = nlmsvc_cancel_blocked(file, &argp->lock); + + dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * UNLOCK: release a lock + */ +static int +nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: UNLOCK called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept new lock requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now try to remove the lock */ + resp->status = nlmsvc_unlock(file, &argp->lock); + + dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * GRANTED: A server calls us to tell that a process' lock request + * was granted + */ +static int +nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + resp->cookie = argp->cookie; + + dprintk("lockd: GRANTED called\n"); + resp->status = nlmclnt_grant(&argp->lock); + dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); + return rpc_success; +} + +/* + * `Async' versions of the above service routines. They aren't really, + * because we send the callback before the reply proper. I hope this + * doesn't break any clients. + */ +static int +nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: TEST_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlm4svc_proc_test(rqstp, argp, &res)) == 0) + stat = nlm4svc_callback(rqstp, NLMPROC_TEST_RES, &res); + return stat; +} + +static int +nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: LOCK_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlm4svc_proc_lock(rqstp, argp, &res)) == 0) + stat = nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, &res); + return stat; +} + +static int +nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: CANCEL_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlm4svc_proc_cancel(rqstp, argp, &res)) == 0) + stat = nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, &res); + return stat; +} + +static int +nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: UNLOCK_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlm4svc_proc_unlock(rqstp, argp, &res)) == 0) + stat = nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, &res); + return stat; +} + +static int +nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: GRANTED_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlm4svc_proc_granted(rqstp, argp, &res)) == 0) + stat = nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, &res); + return stat; +} + +/* + * SHARE: create a DOS share or alter existing share. + */ +static int +nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: SHARE called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept new lock requests during grace period */ + if (nlmsvc_grace_period && !argp->reclaim) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now try to create the share */ + resp->status = nlmsvc_share_file(host, file, argp); + + dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * UNSHARE: Release a DOS share. + */ +static int +nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: UNSHARE called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now try to lock the file */ + resp->status = nlmsvc_unshare_file(host, file, argp); + + dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * NM_LOCK: Create an unmonitored lock + */ +static int +nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + dprintk("lockd: NM_LOCK called\n"); + + argp->monitor = 0; /* just clean the monitor flag */ + return nlm4svc_proc_lock(rqstp, argp, resp); +} + +/* + * FREE_ALL: Release all locks and shares held by client + */ +static int +nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_host *host; + + /* Obtain client */ + if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) + return rpc_success; + + nlmsvc_free_host_resources(host); + nlm_release_host(host); + return rpc_success; +} + +/* + * SM_NOTIFY: private callback from statd (not part of official NLM proto) + */ +static int +nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, + void *resp) +{ + struct sockaddr_in saddr = rqstp->rq_addr; + int vers = argp->vers; + int prot = argp->proto >> 1; + + struct nlm_host *host; + + dprintk("lockd: SM_NOTIFY called\n"); + if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) + || ntohs(saddr.sin_port) >= 1024) { + printk(KERN_WARNING + "lockd: rejected NSM callback from %08x:%d\n", + ntohl(rqstp->rq_addr.sin_addr.s_addr), + ntohs(rqstp->rq_addr.sin_port)); + return rpc_system_err; + } + + /* Obtain the host pointer for this NFS server and try to + * reclaim all locks we hold on this server. + */ + saddr.sin_addr.s_addr = argp->addr; + + if ((argp->proto & 1)==0) { + if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) { + nlmclnt_recovery(host, argp->state); + nlm_release_host(host); + } + } else { + /* If we run on an NFS server, delete all locks held by the client */ + + if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) { + nlmsvc_free_host_resources(host); + nlm_release_host(host); + } + } + return rpc_success; +} + +/* + * client sent a GRANTED_RES, let's remove the associated block + */ +static int +nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, + void *resp) +{ + if (!nlmsvc_ops) + return rpc_success; + + dprintk("lockd: GRANTED_RES called\n"); + + nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); + return rpc_success; +} + + + +/* + * This is the generic lockd callback for async RPC calls + */ +static u32 +nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_rqst *call; + + if (!(call = nlmclnt_alloc_call())) + return rpc_system_err; + + host = nlmclnt_lookup_host(&rqstp->rq_addr, + rqstp->rq_prot, rqstp->rq_vers); + if (!host) { + kfree(call); + return rpc_system_err; + } + + call->a_flags = RPC_TASK_ASYNC; + call->a_host = host; + memcpy(&call->a_args, resp, sizeof(*resp)); + + if (nlmsvc_async_call(call, proc, nlm4svc_callback_exit) < 0) + goto error; + + return rpc_success; + error: + kfree(call); + nlm_release_host(host); + return rpc_system_err; +} + +static void +nlm4svc_callback_exit(struct rpc_task *task) +{ + struct nlm_rqst *call = (struct nlm_rqst *) task->tk_calldata; + + if (task->tk_status < 0) { + dprintk("lockd: %4d callback failed (errno = %d)\n", + task->tk_pid, -task->tk_status); + } + nlm_release_host(call->a_host); + kfree(call); +} + +/* + * NLM Server procedures. + */ + +#define nlm4svc_encode_norep nlm4svc_encode_void +#define nlm4svc_decode_norep nlm4svc_decode_void +#define nlm4svc_decode_testres nlm4svc_decode_void +#define nlm4svc_decode_lockres nlm4svc_decode_void +#define nlm4svc_decode_unlockres nlm4svc_decode_void +#define nlm4svc_decode_cancelres nlm4svc_decode_void +#define nlm4svc_decode_grantedres nlm4svc_decode_void + +#define nlm4svc_proc_none nlm4svc_proc_null +#define nlm4svc_proc_test_res nlm4svc_proc_null +#define nlm4svc_proc_lock_res nlm4svc_proc_null +#define nlm4svc_proc_cancel_res nlm4svc_proc_null +#define nlm4svc_proc_unlock_res nlm4svc_proc_null + +struct nlm_void { int dummy; }; + +#define PROC(name, xargt, xrest, argt, rest, respsize) \ + { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ + .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ + .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ + .pc_release = NULL, \ + .pc_argsize = sizeof(struct nlm_##argt), \ + .pc_ressize = sizeof(struct nlm_##rest), \ + .pc_xdrressize = respsize, \ + } +#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ +#define No (1+1024/4) /* netobj */ +#define St 1 /* status */ +#define Rg 4 /* range (offset + length) */ +struct svc_procedure nlmsvc_procedures4[] = { + PROC(null, void, void, void, void, 1), + PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), + PROC(lock, lockargs, res, args, res, Ck+St), + PROC(cancel, cancargs, res, args, res, Ck+St), + PROC(unlock, unlockargs, res, args, res, Ck+St), + PROC(granted, testargs, res, args, res, Ck+St), + PROC(test_msg, testargs, norep, args, void, 1), + PROC(lock_msg, lockargs, norep, args, void, 1), + PROC(cancel_msg, cancargs, norep, args, void, 1), + PROC(unlock_msg, unlockargs, norep, args, void, 1), + PROC(granted_msg, testargs, norep, args, void, 1), + PROC(test_res, testres, norep, res, void, 1), + PROC(lock_res, lockres, norep, res, void, 1), + PROC(cancel_res, cancelres, norep, res, void, 1), + PROC(unlock_res, unlockres, norep, res, void, 1), + PROC(granted_res, res, norep, res, void, 1), + /* statd callback */ + PROC(sm_notify, reboot, void, reboot, void, 1), + PROC(none, void, void, void, void, 0), + PROC(none, void, void, void, void, 0), + PROC(none, void, void, void, void, 0), + PROC(share, shareargs, shareres, args, res, Ck+St+1), + PROC(unshare, shareargs, shareres, args, res, Ck+St+1), + PROC(nm_lock, lockargs, res, args, res, Ck+St), + PROC(free_all, notify, void, args, void, 1), + +}; diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c new file mode 100644 index 0000000..49f9597 --- /dev/null +++ b/fs/lockd/svclock.c @@ -0,0 +1,686 @@ +/* + * linux/fs/lockd/svclock.c + * + * Handling of server-side locks, mostly of the blocked variety. + * This is the ugliest part of lockd because we tread on very thin ice. + * GRANT and CANCEL calls may get stuck, meet in mid-flight, etc. + * IMNSHO introducing the grant callback into the NLM protocol was one + * of the worst ideas Sun ever had. Except maybe for the idea of doing + * NFS file locking at all. + * + * I'm trying hard to avoid race conditions by protecting most accesses + * to a file's list of blocked locks through a semaphore. The global + * list of blocked locks is not protected in this fashion however. + * Therefore, some functions (such as the RPC callback for the async grant + * call) move blocked locks towards the head of the list *while some other + * process might be traversing it*. This should not be a problem in + * practice, because this will only cause functions traversing the list + * to visit some blocks twice. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/smp_lock.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/lockd/nlm.h> +#include <linux/lockd/lockd.h> + +#define NLMDBG_FACILITY NLMDBG_SVCLOCK + +#ifdef CONFIG_LOCKD_V4 +#define nlm_deadlock nlm4_deadlock +#else +#define nlm_deadlock nlm_lck_denied +#endif + +static void nlmsvc_insert_block(struct nlm_block *block, unsigned long); +static int nlmsvc_remove_block(struct nlm_block *block); +static void nlmsvc_grant_callback(struct rpc_task *task); + +/* + * The list of blocked locks to retry + */ +static struct nlm_block * nlm_blocked; + +/* + * Insert a blocked lock into the global list + */ +static void +nlmsvc_insert_block(struct nlm_block *block, unsigned long when) +{ + struct nlm_block **bp, *b; + + dprintk("lockd: nlmsvc_insert_block(%p, %ld)\n", block, when); + if (block->b_queued) + nlmsvc_remove_block(block); + bp = &nlm_blocked; + if (when != NLM_NEVER) { + if ((when += jiffies) == NLM_NEVER) + when ++; + while ((b = *bp) && time_before_eq(b->b_when,when) && b->b_when != NLM_NEVER) + bp = &b->b_next; + } else + while ((b = *bp) != 0) + bp = &b->b_next; + + block->b_queued = 1; + block->b_when = when; + block->b_next = b; + *bp = block; +} + +/* + * Remove a block from the global list + */ +static int +nlmsvc_remove_block(struct nlm_block *block) +{ + struct nlm_block **bp, *b; + + if (!block->b_queued) + return 1; + for (bp = &nlm_blocked; (b = *bp) != 0; bp = &b->b_next) { + if (b == block) { + *bp = block->b_next; + block->b_queued = 0; + return 1; + } + } + + return 0; +} + +/* + * Find a block for a given lock and optionally remove it from + * the list. + */ +static struct nlm_block * +nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock, int remove) +{ + struct nlm_block **head, *block; + struct file_lock *fl; + + dprintk("lockd: nlmsvc_lookup_block f=%p pd=%d %Ld-%Ld ty=%d\n", + file, lock->fl.fl_pid, + (long long)lock->fl.fl_start, + (long long)lock->fl.fl_end, lock->fl.fl_type); + for (head = &nlm_blocked; (block = *head) != 0; head = &block->b_next) { + fl = &block->b_call.a_args.lock.fl; + dprintk("lockd: check f=%p pd=%d %Ld-%Ld ty=%d cookie=%s\n", + block->b_file, fl->fl_pid, + (long long)fl->fl_start, + (long long)fl->fl_end, fl->fl_type, + nlmdbg_cookie2a(&block->b_call.a_args.cookie)); + if (block->b_file == file && nlm_compare_locks(fl, &lock->fl)) { + if (remove) { + *head = block->b_next; + block->b_queued = 0; + } + return block; + } + } + + return NULL; +} + +static inline int nlm_cookie_match(struct nlm_cookie *a, struct nlm_cookie *b) +{ + if(a->len != b->len) + return 0; + if(memcmp(a->data,b->data,a->len)) + return 0; + return 1; +} + +/* + * Find a block with a given NLM cookie. + */ +static inline struct nlm_block * +nlmsvc_find_block(struct nlm_cookie *cookie, struct sockaddr_in *sin) +{ + struct nlm_block *block; + + for (block = nlm_blocked; block; block = block->b_next) { + dprintk("cookie: head of blocked queue %p, block %p\n", + nlm_blocked, block); + if (nlm_cookie_match(&block->b_call.a_args.cookie,cookie) + && nlm_cmp_addr(sin, &block->b_host->h_addr)) + break; + } + + return block; +} + +/* + * Create a block and initialize it. + * + * Note: we explicitly set the cookie of the grant reply to that of + * the blocked lock request. The spec explicitly mentions that the client + * should _not_ rely on the callback containing the same cookie as the + * request, but (as I found out later) that's because some implementations + * do just this. Never mind the standards comittees, they support our + * logging industries. + */ +static inline struct nlm_block * +nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file, + struct nlm_lock *lock, struct nlm_cookie *cookie) +{ + struct nlm_block *block; + struct nlm_host *host; + struct nlm_rqst *call; + + /* Create host handle for callback */ + host = nlmclnt_lookup_host(&rqstp->rq_addr, + rqstp->rq_prot, rqstp->rq_vers); + if (host == NULL) + return NULL; + + /* Allocate memory for block, and initialize arguments */ + if (!(block = (struct nlm_block *) kmalloc(sizeof(*block), GFP_KERNEL))) + goto failed; + memset(block, 0, sizeof(*block)); + locks_init_lock(&block->b_call.a_args.lock.fl); + locks_init_lock(&block->b_call.a_res.lock.fl); + + if (!nlmclnt_setgrantargs(&block->b_call, lock)) + goto failed_free; + + /* Set notifier function for VFS, and init args */ + block->b_call.a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations; + block->b_call.a_args.cookie = *cookie; /* see above */ + + dprintk("lockd: created block %p...\n", block); + + /* Create and initialize the block */ + block->b_daemon = rqstp->rq_server; + block->b_host = host; + block->b_file = file; + + /* Add to file's list of blocks */ + block->b_fnext = file->f_blocks; + file->f_blocks = block; + + /* Set up RPC arguments for callback */ + call = &block->b_call; + call->a_host = host; + call->a_flags = RPC_TASK_ASYNC; + + return block; + +failed_free: + kfree(block); +failed: + nlm_release_host(host); + return NULL; +} + +/* + * Delete a block. If the lock was cancelled or the grant callback + * failed, unlock is set to 1. + * It is the caller's responsibility to check whether the file + * can be closed hereafter. + */ +static void +nlmsvc_delete_block(struct nlm_block *block, int unlock) +{ + struct file_lock *fl = &block->b_call.a_args.lock.fl; + struct nlm_file *file = block->b_file; + struct nlm_block **bp; + + dprintk("lockd: deleting block %p...\n", block); + + /* Remove block from list */ + nlmsvc_remove_block(block); + if (fl->fl_next) + posix_unblock_lock(file->f_file, fl); + if (unlock) { + fl->fl_type = F_UNLCK; + posix_lock_file(file->f_file, fl); + block->b_granted = 0; + } + + /* If the block is in the middle of a GRANT callback, + * don't kill it yet. */ + if (block->b_incall) { + nlmsvc_insert_block(block, NLM_NEVER); + block->b_done = 1; + return; + } + + /* Remove block from file's list of blocks */ + for (bp = &file->f_blocks; *bp; bp = &(*bp)->b_fnext) { + if (*bp == block) { + *bp = block->b_fnext; + break; + } + } + + if (block->b_host) + nlm_release_host(block->b_host); + nlmclnt_freegrantargs(&block->b_call); + kfree(block); +} + +/* + * Loop over all blocks and perform the action specified. + * (NLM_ACT_CHECK handled by nlmsvc_inspect_file). + */ +int +nlmsvc_traverse_blocks(struct nlm_host *host, struct nlm_file *file, int action) +{ + struct nlm_block *block, *next; + + down(&file->f_sema); + for (block = file->f_blocks; block; block = next) { + next = block->b_fnext; + if (action == NLM_ACT_MARK) + block->b_host->h_inuse = 1; + else if (action == NLM_ACT_UNLOCK) { + if (host == NULL || host == block->b_host) + nlmsvc_delete_block(block, 1); + } + } + up(&file->f_sema); + return 0; +} + +/* + * Attempt to establish a lock, and if it can't be granted, block it + * if required. + */ +u32 +nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file, + struct nlm_lock *lock, int wait, struct nlm_cookie *cookie) +{ + struct file_lock *conflock; + struct nlm_block *block; + int error; + + dprintk("lockd: nlmsvc_lock(%s/%ld, ty=%d, pi=%d, %Ld-%Ld, bl=%d)\n", + file->f_file->f_dentry->d_inode->i_sb->s_id, + file->f_file->f_dentry->d_inode->i_ino, + lock->fl.fl_type, lock->fl.fl_pid, + (long long)lock->fl.fl_start, + (long long)lock->fl.fl_end, + wait); + + + /* Get existing block (in case client is busy-waiting) */ + block = nlmsvc_lookup_block(file, lock, 0); + + lock->fl.fl_flags |= FL_LOCKD; + +again: + /* Lock file against concurrent access */ + down(&file->f_sema); + + if (!(conflock = posix_test_lock(file->f_file, &lock->fl))) { + error = posix_lock_file(file->f_file, &lock->fl); + + if (block) + nlmsvc_delete_block(block, 0); + up(&file->f_sema); + + dprintk("lockd: posix_lock_file returned %d\n", -error); + switch(-error) { + case 0: + return nlm_granted; + case EDEADLK: + return nlm_deadlock; + case EAGAIN: + return nlm_lck_denied; + default: /* includes ENOLCK */ + return nlm_lck_denied_nolocks; + } + } + + if (!wait) { + up(&file->f_sema); + return nlm_lck_denied; + } + + if (posix_locks_deadlock(&lock->fl, conflock)) { + up(&file->f_sema); + return nlm_deadlock; + } + + /* If we don't have a block, create and initialize it. Then + * retry because we may have slept in kmalloc. */ + /* We have to release f_sema as nlmsvc_create_block may try to + * to claim it while doing host garbage collection */ + if (block == NULL) { + up(&file->f_sema); + dprintk("lockd: blocking on this lock (allocating).\n"); + if (!(block = nlmsvc_create_block(rqstp, file, lock, cookie))) + return nlm_lck_denied_nolocks; + goto again; + } + + /* Append to list of blocked */ + nlmsvc_insert_block(block, NLM_NEVER); + + if (list_empty(&block->b_call.a_args.lock.fl.fl_block)) { + /* Now add block to block list of the conflicting lock + if we haven't done so. */ + dprintk("lockd: blocking on this lock.\n"); + posix_block_lock(conflock, &block->b_call.a_args.lock.fl); + } + + up(&file->f_sema); + return nlm_lck_blocked; +} + +/* + * Test for presence of a conflicting lock. + */ +u32 +nlmsvc_testlock(struct nlm_file *file, struct nlm_lock *lock, + struct nlm_lock *conflock) +{ + struct file_lock *fl; + + dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n", + file->f_file->f_dentry->d_inode->i_sb->s_id, + file->f_file->f_dentry->d_inode->i_ino, + lock->fl.fl_type, + (long long)lock->fl.fl_start, + (long long)lock->fl.fl_end); + + if ((fl = posix_test_lock(file->f_file, &lock->fl)) != NULL) { + dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n", + fl->fl_type, (long long)fl->fl_start, + (long long)fl->fl_end); + conflock->caller = "somehost"; /* FIXME */ + conflock->oh.len = 0; /* don't return OH info */ + conflock->fl = *fl; + return nlm_lck_denied; + } + + return nlm_granted; +} + +/* + * Remove a lock. + * This implies a CANCEL call: We send a GRANT_MSG, the client replies + * with a GRANT_RES call which gets lost, and calls UNLOCK immediately + * afterwards. In this case the block will still be there, and hence + * must be removed. + */ +u32 +nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock) +{ + int error; + + dprintk("lockd: nlmsvc_unlock(%s/%ld, pi=%d, %Ld-%Ld)\n", + file->f_file->f_dentry->d_inode->i_sb->s_id, + file->f_file->f_dentry->d_inode->i_ino, + lock->fl.fl_pid, + (long long)lock->fl.fl_start, + (long long)lock->fl.fl_end); + + /* First, cancel any lock that might be there */ + nlmsvc_cancel_blocked(file, lock); + + lock->fl.fl_type = F_UNLCK; + error = posix_lock_file(file->f_file, &lock->fl); + + return (error < 0)? nlm_lck_denied_nolocks : nlm_granted; +} + +/* + * Cancel a previously blocked request. + * + * A cancel request always overrides any grant that may currently + * be in progress. + * The calling procedure must check whether the file can be closed. + */ +u32 +nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock) +{ + struct nlm_block *block; + + dprintk("lockd: nlmsvc_cancel(%s/%ld, pi=%d, %Ld-%Ld)\n", + file->f_file->f_dentry->d_inode->i_sb->s_id, + file->f_file->f_dentry->d_inode->i_ino, + lock->fl.fl_pid, + (long long)lock->fl.fl_start, + (long long)lock->fl.fl_end); + + down(&file->f_sema); + if ((block = nlmsvc_lookup_block(file, lock, 1)) != NULL) + nlmsvc_delete_block(block, 1); + up(&file->f_sema); + return nlm_granted; +} + +/* + * Unblock a blocked lock request. This is a callback invoked from the + * VFS layer when a lock on which we blocked is removed. + * + * This function doesn't grant the blocked lock instantly, but rather moves + * the block to the head of nlm_blocked where it can be picked up by lockd. + */ +static void +nlmsvc_notify_blocked(struct file_lock *fl) +{ + struct nlm_block **bp, *block; + + dprintk("lockd: VFS unblock notification for block %p\n", fl); + for (bp = &nlm_blocked; (block = *bp) != 0; bp = &block->b_next) { + if (nlm_compare_locks(&block->b_call.a_args.lock.fl, fl)) { + nlmsvc_insert_block(block, 0); + svc_wake_up(block->b_daemon); + return; + } + } + + printk(KERN_WARNING "lockd: notification for unknown block!\n"); +} + +static int nlmsvc_same_owner(struct file_lock *fl1, struct file_lock *fl2) +{ + return fl1->fl_owner == fl2->fl_owner && fl1->fl_pid == fl2->fl_pid; +} + +struct lock_manager_operations nlmsvc_lock_operations = { + .fl_compare_owner = nlmsvc_same_owner, + .fl_notify = nlmsvc_notify_blocked, +}; + +/* + * Try to claim a lock that was previously blocked. + * + * Note that we use both the RPC_GRANTED_MSG call _and_ an async + * RPC thread when notifying the client. This seems like overkill... + * Here's why: + * - we don't want to use a synchronous RPC thread, otherwise + * we might find ourselves hanging on a dead portmapper. + * - Some lockd implementations (e.g. HP) don't react to + * RPC_GRANTED calls; they seem to insist on RPC_GRANTED_MSG calls. + */ +static void +nlmsvc_grant_blocked(struct nlm_block *block) +{ + struct nlm_file *file = block->b_file; + struct nlm_lock *lock = &block->b_call.a_args.lock; + struct file_lock *conflock; + int error; + + dprintk("lockd: grant blocked lock %p\n", block); + + /* First thing is lock the file */ + down(&file->f_sema); + + /* Unlink block request from list */ + nlmsvc_remove_block(block); + + /* If b_granted is true this means we've been here before. + * Just retry the grant callback, possibly refreshing the RPC + * binding */ + if (block->b_granted) { + nlm_rebind_host(block->b_host); + goto callback; + } + + /* Try the lock operation again */ + if ((conflock = posix_test_lock(file->f_file, &lock->fl)) != NULL) { + /* Bummer, we blocked again */ + dprintk("lockd: lock still blocked\n"); + nlmsvc_insert_block(block, NLM_NEVER); + posix_block_lock(conflock, &lock->fl); + up(&file->f_sema); + return; + } + + /* Alright, no conflicting lock. Now lock it for real. If the + * following yields an error, this is most probably due to low + * memory. Retry the lock in a few seconds. + */ + if ((error = posix_lock_file(file->f_file, &lock->fl)) < 0) { + printk(KERN_WARNING "lockd: unexpected error %d in %s!\n", + -error, __FUNCTION__); + nlmsvc_insert_block(block, 10 * HZ); + up(&file->f_sema); + return; + } + +callback: + /* Lock was granted by VFS. */ + dprintk("lockd: GRANTing blocked lock.\n"); + block->b_granted = 1; + block->b_incall = 1; + + /* Schedule next grant callback in 30 seconds */ + nlmsvc_insert_block(block, 30 * HZ); + + /* Call the client */ + nlm_get_host(block->b_call.a_host); + if (nlmsvc_async_call(&block->b_call, NLMPROC_GRANTED_MSG, + nlmsvc_grant_callback) < 0) + nlm_release_host(block->b_call.a_host); + up(&file->f_sema); +} + +/* + * This is the callback from the RPC layer when the NLM_GRANTED_MSG + * RPC call has succeeded or timed out. + * Like all RPC callbacks, it is invoked by the rpciod process, so it + * better not sleep. Therefore, we put the blocked lock on the nlm_blocked + * chain once more in order to have it removed by lockd itself (which can + * then sleep on the file semaphore without disrupting e.g. the nfs client). + */ +static void +nlmsvc_grant_callback(struct rpc_task *task) +{ + struct nlm_rqst *call = (struct nlm_rqst *) task->tk_calldata; + struct nlm_block *block; + unsigned long timeout; + struct sockaddr_in *peer_addr = RPC_PEERADDR(task->tk_client); + + dprintk("lockd: GRANT_MSG RPC callback\n"); + dprintk("callback: looking for cookie %s, host (%u.%u.%u.%u)\n", + nlmdbg_cookie2a(&call->a_args.cookie), + NIPQUAD(peer_addr->sin_addr.s_addr)); + if (!(block = nlmsvc_find_block(&call->a_args.cookie, peer_addr))) { + dprintk("lockd: no block for cookie %s, host (%u.%u.%u.%u)\n", + nlmdbg_cookie2a(&call->a_args.cookie), + NIPQUAD(peer_addr->sin_addr.s_addr)); + return; + } + + /* Technically, we should down the file semaphore here. Since we + * move the block towards the head of the queue only, no harm + * can be done, though. */ + if (task->tk_status < 0) { + /* RPC error: Re-insert for retransmission */ + timeout = 10 * HZ; + } else if (block->b_done) { + /* Block already removed, kill it for real */ + timeout = 0; + } else { + /* Call was successful, now wait for client callback */ + timeout = 60 * HZ; + } + nlmsvc_insert_block(block, timeout); + svc_wake_up(block->b_daemon); + block->b_incall = 0; + + nlm_release_host(call->a_host); +} + +/* + * We received a GRANT_RES callback. Try to find the corresponding + * block. + */ +void +nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status) +{ + struct nlm_block *block; + struct nlm_file *file; + + dprintk("grant_reply: looking for cookie %x, host (%08x), s=%d \n", + *(unsigned int *)(cookie->data), + ntohl(rqstp->rq_addr.sin_addr.s_addr), status); + if (!(block = nlmsvc_find_block(cookie, &rqstp->rq_addr))) + return; + file = block->b_file; + + file->f_count++; + down(&file->f_sema); + if ((block = nlmsvc_find_block(cookie,&rqstp->rq_addr)) != NULL) { + if (status == NLM_LCK_DENIED_GRACE_PERIOD) { + /* Try again in a couple of seconds */ + nlmsvc_insert_block(block, 10 * HZ); + block = NULL; + } else { + /* Lock is now held by client, or has been rejected. + * In both cases, the block should be removed. */ + up(&file->f_sema); + if (status == NLM_LCK_GRANTED) + nlmsvc_delete_block(block, 0); + else + nlmsvc_delete_block(block, 1); + } + } + if (!block) + up(&file->f_sema); + nlm_release_file(file); +} + +/* + * Retry all blocked locks that have been notified. This is where lockd + * picks up locks that can be granted, or grant notifications that must + * be retransmitted. + */ +unsigned long +nlmsvc_retry_blocked(void) +{ + struct nlm_block *block; + + dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n", + nlm_blocked, + nlm_blocked? nlm_blocked->b_when : 0); + while ((block = nlm_blocked) != 0) { + if (block->b_when == NLM_NEVER) + break; + if (time_after(block->b_when,jiffies)) + break; + dprintk("nlmsvc_retry_blocked(%p, when=%ld, done=%d)\n", + block, block->b_when, block->b_done); + if (block->b_done) + nlmsvc_delete_block(block, 0); + else + nlmsvc_grant_blocked(block); + } + + if ((block = nlm_blocked) && block->b_when != NLM_NEVER) + return (block->b_when - jiffies); + + return MAX_SCHEDULE_TIMEOUT; +} diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c new file mode 100644 index 0000000..757e344 --- /dev/null +++ b/fs/lockd/svcproc.c @@ -0,0 +1,606 @@ +/* + * linux/fs/lockd/svcproc.c + * + * Lockd server procedures. We don't implement the NLM_*_RES + * procedures because we don't use the async procedures. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/time.h> +#include <linux/slab.h> +#include <linux/in.h> +#include <linux/sunrpc/svc.h> +#include <linux/sunrpc/clnt.h> +#include <linux/nfsd/nfsd.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/share.h> +#include <linux/lockd/sm_inter.h> + + +#define NLMDBG_FACILITY NLMDBG_CLIENT + +static u32 nlmsvc_callback(struct svc_rqst *, u32, struct nlm_res *); +static void nlmsvc_callback_exit(struct rpc_task *); + +#ifdef CONFIG_LOCKD_V4 +static u32 +cast_to_nlm(u32 status, u32 vers) +{ + /* Note: status is assumed to be in network byte order !!! */ + if (vers != 4){ + switch (status) { + case nlm_granted: + case nlm_lck_denied: + case nlm_lck_denied_nolocks: + case nlm_lck_blocked: + case nlm_lck_denied_grace_period: + break; + case nlm4_deadlock: + status = nlm_lck_denied; + break; + default: + status = nlm_lck_denied_nolocks; + } + } + + return (status); +} +#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers)) +#else +#define cast_status(status) (status) +#endif + +/* + * Obtain client and file from arguments + */ +static u32 +nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_host **hostp, struct nlm_file **filp) +{ + struct nlm_host *host = NULL; + struct nlm_file *file = NULL; + struct nlm_lock *lock = &argp->lock; + u32 error; + + /* nfsd callbacks must have been installed for this procedure */ + if (!nlmsvc_ops) + return nlm_lck_denied_nolocks; + + /* Obtain host handle */ + if (!(host = nlmsvc_lookup_host(rqstp)) + || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0)) + goto no_locks; + *hostp = host; + + /* Obtain file pointer. Not used by FREE_ALL call. */ + if (filp != NULL) { + if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) + goto no_locks; + *filp = file; + + /* Set up the missing parts of the file_lock structure */ + lock->fl.fl_file = file->f_file; + lock->fl.fl_owner = (fl_owner_t) host; + lock->fl.fl_lmops = &nlmsvc_lock_operations; + } + + return 0; + +no_locks: + if (host) + nlm_release_host(host); + return nlm_lck_denied_nolocks; +} + +/* + * NULL: Test for presence of service + */ +static int +nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) +{ + dprintk("lockd: NULL called\n"); + return rpc_success; +} + +/* + * TEST: Check for conflicting lock + */ +static int +nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: TEST called\n"); + resp->cookie = argp->cookie; + + /* Don't accept test requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now check for conflicting locks */ + resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock)); + + dprintk("lockd: TEST status %d vers %d\n", + ntohl(resp->status), rqstp->rq_vers); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +static int +nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: LOCK called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept new lock requests during grace period */ + if (nlmsvc_grace_period && !argp->reclaim) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + +#if 0 + /* If supplied state doesn't match current state, we assume it's + * an old request that time-warped somehow. Any error return would + * do in this case because it's irrelevant anyway. + * + * NB: We don't retrieve the remote host's state yet. + */ + if (host->h_nsmstate && host->h_nsmstate != argp->state) { + resp->status = nlm_lck_denied_nolocks; + } else +#endif + + /* Now try to lock the file */ + resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock, + argp->block, &argp->cookie)); + + dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +static int +nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: CANCEL called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Try to cancel request. */ + resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); + + dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * UNLOCK: release a lock + */ +static int +nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: UNLOCK called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept new lock requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now try to remove the lock */ + resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); + + dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * GRANTED: A server calls us to tell that a process' lock request + * was granted + */ +static int +nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + resp->cookie = argp->cookie; + + dprintk("lockd: GRANTED called\n"); + resp->status = nlmclnt_grant(&argp->lock); + dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); + return rpc_success; +} + +/* + * `Async' versions of the above service routines. They aren't really, + * because we send the callback before the reply proper. I hope this + * doesn't break any clients. + */ +static int +nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: TEST_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlmsvc_proc_test(rqstp, argp, &res)) == 0) + stat = nlmsvc_callback(rqstp, NLMPROC_TEST_RES, &res); + return stat; +} + +static int +nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: LOCK_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlmsvc_proc_lock(rqstp, argp, &res)) == 0) + stat = nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, &res); + return stat; +} + +static int +nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: CANCEL_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlmsvc_proc_cancel(rqstp, argp, &res)) == 0) + stat = nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, &res); + return stat; +} + +static int +nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: UNLOCK_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlmsvc_proc_unlock(rqstp, argp, &res)) == 0) + stat = nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, &res); + return stat; +} + +static int +nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_res res; + u32 stat; + + dprintk("lockd: GRANTED_MSG called\n"); + memset(&res, 0, sizeof(res)); + + if ((stat = nlmsvc_proc_granted(rqstp, argp, &res)) == 0) + stat = nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, &res); + return stat; +} + +/* + * SHARE: create a DOS share or alter existing share. + */ +static int +nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: SHARE called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept new lock requests during grace period */ + if (nlmsvc_grace_period && !argp->reclaim) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now try to create the share */ + resp->status = cast_status(nlmsvc_share_file(host, file, argp)); + + dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * UNSHARE: Release a DOS share. + */ +static int +nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_file *file; + + dprintk("lockd: UNSHARE called\n"); + + resp->cookie = argp->cookie; + + /* Don't accept requests during grace period */ + if (nlmsvc_grace_period) { + resp->status = nlm_lck_denied_grace_period; + return rpc_success; + } + + /* Obtain client and file */ + if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) + return rpc_success; + + /* Now try to unshare the file */ + resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); + + dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); + nlm_release_host(host); + nlm_release_file(file); + return rpc_success; +} + +/* + * NM_LOCK: Create an unmonitored lock + */ +static int +nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, + struct nlm_res *resp) +{ + dprintk("lockd: NM_LOCK called\n"); + + argp->monitor = 0; /* just clean the monitor flag */ + return nlmsvc_proc_lock(rqstp, argp, resp); +} + +/* + * FREE_ALL: Release all locks and shares held by client + */ +static int +nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, + void *resp) +{ + struct nlm_host *host; + + /* Obtain client */ + if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) + return rpc_success; + + nlmsvc_free_host_resources(host); + nlm_release_host(host); + return rpc_success; +} + +/* + * SM_NOTIFY: private callback from statd (not part of official NLM proto) + */ +static int +nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, + void *resp) +{ + struct sockaddr_in saddr = rqstp->rq_addr; + int vers = argp->vers; + int prot = argp->proto >> 1; + struct nlm_host *host; + + dprintk("lockd: SM_NOTIFY called\n"); + if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) + || ntohs(saddr.sin_port) >= 1024) { + printk(KERN_WARNING + "lockd: rejected NSM callback from %08x:%d\n", + ntohl(rqstp->rq_addr.sin_addr.s_addr), + ntohs(rqstp->rq_addr.sin_port)); + return rpc_system_err; + } + + /* Obtain the host pointer for this NFS server and try to + * reclaim all locks we hold on this server. + */ + saddr.sin_addr.s_addr = argp->addr; + if ((argp->proto & 1)==0) { + if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) { + nlmclnt_recovery(host, argp->state); + nlm_release_host(host); + } + } else { + /* If we run on an NFS server, delete all locks held by the client */ + if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) { + nlmsvc_free_host_resources(host); + nlm_release_host(host); + } + } + + return rpc_success; +} + +/* + * client sent a GRANTED_RES, let's remove the associated block + */ +static int +nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, + void *resp) +{ + if (!nlmsvc_ops) + return rpc_success; + + dprintk("lockd: GRANTED_RES called\n"); + + nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); + return rpc_success; +} + +/* + * This is the generic lockd callback for async RPC calls + */ +static u32 +nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp) +{ + struct nlm_host *host; + struct nlm_rqst *call; + + if (!(call = nlmclnt_alloc_call())) + return rpc_system_err; + + host = nlmclnt_lookup_host(&rqstp->rq_addr, + rqstp->rq_prot, rqstp->rq_vers); + if (!host) { + kfree(call); + return rpc_system_err; + } + + call->a_flags = RPC_TASK_ASYNC; + call->a_host = host; + memcpy(&call->a_args, resp, sizeof(*resp)); + + if (nlmsvc_async_call(call, proc, nlmsvc_callback_exit) < 0) + goto error; + + return rpc_success; + error: + nlm_release_host(host); + kfree(call); + return rpc_system_err; +} + +static void +nlmsvc_callback_exit(struct rpc_task *task) +{ + struct nlm_rqst *call = (struct nlm_rqst *) task->tk_calldata; + + if (task->tk_status < 0) { + dprintk("lockd: %4d callback failed (errno = %d)\n", + task->tk_pid, -task->tk_status); + } + nlm_release_host(call->a_host); + kfree(call); +} + +/* + * NLM Server procedures. + */ + +#define nlmsvc_encode_norep nlmsvc_encode_void +#define nlmsvc_decode_norep nlmsvc_decode_void +#define nlmsvc_decode_testres nlmsvc_decode_void +#define nlmsvc_decode_lockres nlmsvc_decode_void +#define nlmsvc_decode_unlockres nlmsvc_decode_void +#define nlmsvc_decode_cancelres nlmsvc_decode_void +#define nlmsvc_decode_grantedres nlmsvc_decode_void + +#define nlmsvc_proc_none nlmsvc_proc_null +#define nlmsvc_proc_test_res nlmsvc_proc_null +#define nlmsvc_proc_lock_res nlmsvc_proc_null +#define nlmsvc_proc_cancel_res nlmsvc_proc_null +#define nlmsvc_proc_unlock_res nlmsvc_proc_null + +struct nlm_void { int dummy; }; + +#define PROC(name, xargt, xrest, argt, rest, respsize) \ + { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ + .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ + .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ + .pc_release = NULL, \ + .pc_argsize = sizeof(struct nlm_##argt), \ + .pc_ressize = sizeof(struct nlm_##rest), \ + .pc_xdrressize = respsize, \ + } + +#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ +#define St 1 /* status */ +#define No (1+1024/4) /* Net Obj */ +#define Rg 2 /* range - offset + size */ + +struct svc_procedure nlmsvc_procedures[] = { + PROC(null, void, void, void, void, 1), + PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), + PROC(lock, lockargs, res, args, res, Ck+St), + PROC(cancel, cancargs, res, args, res, Ck+St), + PROC(unlock, unlockargs, res, args, res, Ck+St), + PROC(granted, testargs, res, args, res, Ck+St), + PROC(test_msg, testargs, norep, args, void, 1), + PROC(lock_msg, lockargs, norep, args, void, 1), + PROC(cancel_msg, cancargs, norep, args, void, 1), + PROC(unlock_msg, unlockargs, norep, args, void, 1), + PROC(granted_msg, testargs, norep, args, void, 1), + PROC(test_res, testres, norep, res, void, 1), + PROC(lock_res, lockres, norep, res, void, 1), + PROC(cancel_res, cancelres, norep, res, void, 1), + PROC(unlock_res, unlockres, norep, res, void, 1), + PROC(granted_res, res, norep, res, void, 1), + /* statd callback */ + PROC(sm_notify, reboot, void, reboot, void, 1), + PROC(none, void, void, void, void, 1), + PROC(none, void, void, void, void, 1), + PROC(none, void, void, void, void, 1), + PROC(share, shareargs, shareres, args, res, Ck+St+1), + PROC(unshare, shareargs, shareres, args, res, Ck+St+1), + PROC(nm_lock, lockargs, res, args, res, Ck+St), + PROC(free_all, notify, void, args, void, 0), + +}; diff --git a/fs/lockd/svcshare.c b/fs/lockd/svcshare.c new file mode 100644 index 0000000..4943fb7 --- /dev/null +++ b/fs/lockd/svcshare.c @@ -0,0 +1,111 @@ +/* + * linux/fs/lockd/svcshare.c + * + * Management of DOS shares. + * + * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/time.h> +#include <linux/unistd.h> +#include <linux/string.h> +#include <linux/slab.h> + +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/share.h> + +static inline int +nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh) +{ + return share->s_owner.len == oh->len + && !memcmp(share->s_owner.data, oh->data, oh->len); +} + +u32 +nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file, + struct nlm_args *argp) +{ + struct nlm_share *share; + struct xdr_netobj *oh = &argp->lock.oh; + u8 *ohdata; + + for (share = file->f_shares; share; share = share->s_next) { + if (share->s_host == host && nlm_cmp_owner(share, oh)) + goto update; + if ((argp->fsm_access & share->s_mode) + || (argp->fsm_mode & share->s_access )) + return nlm_lck_denied; + } + + share = (struct nlm_share *) kmalloc(sizeof(*share) + oh->len, + GFP_KERNEL); + if (share == NULL) + return nlm_lck_denied_nolocks; + + /* Copy owner handle */ + ohdata = (u8 *) (share + 1); + memcpy(ohdata, oh->data, oh->len); + + share->s_file = file; + share->s_host = host; + share->s_owner.data = ohdata; + share->s_owner.len = oh->len; + share->s_next = file->f_shares; + file->f_shares = share; + +update: + share->s_access = argp->fsm_access; + share->s_mode = argp->fsm_mode; + return nlm_granted; +} + +/* + * Delete a share. + */ +u32 +nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file, + struct nlm_args *argp) +{ + struct nlm_share *share, **shpp; + struct xdr_netobj *oh = &argp->lock.oh; + + for (shpp = &file->f_shares; (share = *shpp) != 0; shpp = &share->s_next) { + if (share->s_host == host && nlm_cmp_owner(share, oh)) { + *shpp = share->s_next; + kfree(share); + return nlm_granted; + } + } + + /* X/Open spec says return success even if there was no + * corresponding share. */ + return nlm_granted; +} + +/* + * Traverse all shares for a given file (and host). + * NLM_ACT_CHECK is handled by nlmsvc_inspect_file. + */ +int +nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, int action) +{ + struct nlm_share *share, **shpp; + + shpp = &file->f_shares; + while ((share = *shpp) != NULL) { + if (action == NLM_ACT_MARK) + share->s_host->h_inuse = 1; + else if (action == NLM_ACT_UNLOCK) { + if (host == NULL || host == share->s_host) { + *shpp = share->s_next; + kfree(share); + continue; + } + } + shpp = &share->s_next; + } + + return 0; +} diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c new file mode 100644 index 0000000..de75363 --- /dev/null +++ b/fs/lockd/svcsubs.c @@ -0,0 +1,309 @@ +/* + * linux/fs/lockd/svcsubs.c + * + * Various support routines for the NLM server. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/time.h> +#include <linux/in.h> +#include <linux/sunrpc/svc.h> +#include <linux/sunrpc/clnt.h> +#include <linux/nfsd/nfsfh.h> +#include <linux/nfsd/export.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/share.h> +#include <linux/lockd/sm_inter.h> + +#define NLMDBG_FACILITY NLMDBG_SVCSUBS + + +/* + * Global file hash table + */ +#define FILE_HASH_BITS 5 +#define FILE_NRHASH (1<<FILE_HASH_BITS) +static struct nlm_file * nlm_files[FILE_NRHASH]; +static DECLARE_MUTEX(nlm_file_sema); + +static inline unsigned int file_hash(struct nfs_fh *f) +{ + unsigned int tmp=0; + int i; + for (i=0; i<NFS2_FHSIZE;i++) + tmp += f->data[i]; + return tmp & (FILE_NRHASH - 1); +} + +/* + * Lookup file info. If it doesn't exist, create a file info struct + * and open a (VFS) file for the given inode. + * + * FIXME: + * Note that we open the file O_RDONLY even when creating write locks. + * This is not quite right, but for now, we assume the client performs + * the proper R/W checking. + */ +u32 +nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result, + struct nfs_fh *f) +{ + struct nlm_file *file; + unsigned int hash; + u32 nfserr; + u32 *fhp = (u32*)f->data; + + dprintk("lockd: nlm_file_lookup(%08x %08x %08x %08x %08x %08x)\n", + fhp[0], fhp[1], fhp[2], fhp[3], fhp[4], fhp[5]); + + + hash = file_hash(f); + + /* Lock file table */ + down(&nlm_file_sema); + + for (file = nlm_files[hash]; file; file = file->f_next) + if (!nfs_compare_fh(&file->f_handle, f)) + goto found; + + dprintk("lockd: creating file for (%08x %08x %08x %08x %08x %08x)\n", + fhp[0], fhp[1], fhp[2], fhp[3], fhp[4], fhp[5]); + + nfserr = nlm_lck_denied_nolocks; + file = (struct nlm_file *) kmalloc(sizeof(*file), GFP_KERNEL); + if (!file) + goto out_unlock; + + memset(file, 0, sizeof(*file)); + memcpy(&file->f_handle, f, sizeof(struct nfs_fh)); + file->f_hash = hash; + init_MUTEX(&file->f_sema); + + /* Open the file. Note that this must not sleep for too long, else + * we would lock up lockd:-) So no NFS re-exports, folks. + * + * We have to make sure we have the right credential to open + * the file. + */ + if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) { + dprintk("lockd: open failed (nfserr %d)\n", ntohl(nfserr)); + goto out_free; + } + + file->f_next = nlm_files[hash]; + nlm_files[hash] = file; + +found: + dprintk("lockd: found file %p (count %d)\n", file, file->f_count); + *result = file; + file->f_count++; + nfserr = 0; + +out_unlock: + up(&nlm_file_sema); + return nfserr; + +out_free: + kfree(file); +#ifdef CONFIG_LOCKD_V4 + if (nfserr == 1) + nfserr = nlm4_stale_fh; + else +#endif + nfserr = nlm_lck_denied; + goto out_unlock; +} + +/* + * Delete a file after having released all locks, blocks and shares + */ +static inline void +nlm_delete_file(struct nlm_file *file) +{ + struct inode *inode = file->f_file->f_dentry->d_inode; + struct nlm_file **fp, *f; + + dprintk("lockd: closing file %s/%ld\n", + inode->i_sb->s_id, inode->i_ino); + fp = nlm_files + file->f_hash; + while ((f = *fp) != NULL) { + if (f == file) { + *fp = file->f_next; + nlmsvc_ops->fclose(file->f_file); + kfree(file); + return; + } + fp = &f->f_next; + } + + printk(KERN_WARNING "lockd: attempt to release unknown file!\n"); +} + +/* + * Loop over all locks on the given file and perform the specified + * action. + */ +static int +nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, int action) +{ + struct inode *inode = nlmsvc_file_inode(file); + struct file_lock *fl; + struct nlm_host *lockhost; + +again: + file->f_locks = 0; + for (fl = inode->i_flock; fl; fl = fl->fl_next) { + if (!(fl->fl_flags & FL_LOCKD)) + continue; + + /* update current lock count */ + file->f_locks++; + lockhost = (struct nlm_host *) fl->fl_owner; + if (action == NLM_ACT_MARK) + lockhost->h_inuse = 1; + else if (action == NLM_ACT_CHECK) + return 1; + else if (action == NLM_ACT_UNLOCK) { + struct file_lock lock = *fl; + + if (host && lockhost != host) + continue; + + lock.fl_type = F_UNLCK; + lock.fl_start = 0; + lock.fl_end = OFFSET_MAX; + if (posix_lock_file(file->f_file, &lock) < 0) { + printk("lockd: unlock failure in %s:%d\n", + __FILE__, __LINE__); + return 1; + } + goto again; + } + } + + return 0; +} + +/* + * Operate on a single file + */ +static inline int +nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, int action) +{ + if (action == NLM_ACT_CHECK) { + /* Fast path for mark and sweep garbage collection */ + if (file->f_count || file->f_blocks || file->f_shares) + return 1; + } else { + if (nlmsvc_traverse_blocks(host, file, action) + || nlmsvc_traverse_shares(host, file, action)) + return 1; + } + return nlm_traverse_locks(host, file, action); +} + +/* + * Loop over all files in the file table. + */ +static int +nlm_traverse_files(struct nlm_host *host, int action) +{ + struct nlm_file *file, **fp; + int i; + + down(&nlm_file_sema); + for (i = 0; i < FILE_NRHASH; i++) { + fp = nlm_files + i; + while ((file = *fp) != NULL) { + /* Traverse locks, blocks and shares of this file + * and update file->f_locks count */ + if (nlm_inspect_file(host, file, action)) { + up(&nlm_file_sema); + return 1; + } + + /* No more references to this file. Let go of it. */ + if (!file->f_blocks && !file->f_locks + && !file->f_shares && !file->f_count) { + *fp = file->f_next; + nlmsvc_ops->fclose(file->f_file); + kfree(file); + } else { + fp = &file->f_next; + } + } + } + up(&nlm_file_sema); + return 0; +} + +/* + * Release file. If there are no more remote locks on this file, + * close it and free the handle. + * + * Note that we can't do proper reference counting without major + * contortions because the code in fs/locks.c creates, deletes and + * splits locks without notification. Our only way is to walk the + * entire lock list each time we remove a lock. + */ +void +nlm_release_file(struct nlm_file *file) +{ + dprintk("lockd: nlm_release_file(%p, ct = %d)\n", + file, file->f_count); + + /* Lock file table */ + down(&nlm_file_sema); + + /* If there are no more locks etc, delete the file */ + if(--file->f_count == 0) { + if(!nlm_inspect_file(NULL, file, NLM_ACT_CHECK)) + nlm_delete_file(file); + } + + up(&nlm_file_sema); +} + +/* + * Mark all hosts that still hold resources + */ +void +nlmsvc_mark_resources(void) +{ + dprintk("lockd: nlmsvc_mark_resources\n"); + + nlm_traverse_files(NULL, NLM_ACT_MARK); +} + +/* + * Release all resources held by the given client + */ +void +nlmsvc_free_host_resources(struct nlm_host *host) +{ + dprintk("lockd: nlmsvc_free_host_resources\n"); + + if (nlm_traverse_files(host, NLM_ACT_UNLOCK)) + printk(KERN_WARNING + "lockd: couldn't remove all locks held by %s", + host->h_name); +} + +/* + * delete all hosts structs for clients + */ +void +nlmsvc_invalidate_all(void) +{ + struct nlm_host *host; + while ((host = nlm_find_client()) != NULL) { + nlmsvc_free_host_resources(host); + host->h_expires = 0; + host->h_killed = 1; + nlm_release_host(host); + } +} diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c new file mode 100644 index 0000000..f01e9c0 --- /dev/null +++ b/fs/lockd/xdr.c @@ -0,0 +1,635 @@ +/* + * linux/fs/lockd/xdr.c + * + * XDR support for lockd and the lock client. + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/utsname.h> +#include <linux/nfs.h> + +#include <linux/sunrpc/xdr.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/sunrpc/stats.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/sm_inter.h> + +#define NLMDBG_FACILITY NLMDBG_XDR + + +static inline loff_t +s32_to_loff_t(__s32 offset) +{ + return (loff_t)offset; +} + +static inline __s32 +loff_t_to_s32(loff_t offset) +{ + __s32 res; + if (offset >= NLM_OFFSET_MAX) + res = NLM_OFFSET_MAX; + else if (offset <= -NLM_OFFSET_MAX) + res = -NLM_OFFSET_MAX; + else + res = offset; + return res; +} + +/* + * XDR functions for basic NLM types + */ +static inline u32 *nlm_decode_cookie(u32 *p, struct nlm_cookie *c) +{ + unsigned int len; + + len = ntohl(*p++); + + if(len==0) + { + c->len=4; + memset(c->data, 0, 4); /* hockeypux brain damage */ + } + else if(len<=NLM_MAXCOOKIELEN) + { + c->len=len; + memcpy(c->data, p, len); + p+=XDR_QUADLEN(len); + } + else + { + printk(KERN_NOTICE + "lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN); + return NULL; + } + return p; +} + +static inline u32 * +nlm_encode_cookie(u32 *p, struct nlm_cookie *c) +{ + *p++ = htonl(c->len); + memcpy(p, c->data, c->len); + p+=XDR_QUADLEN(c->len); + return p; +} + +static inline u32 * +nlm_decode_fh(u32 *p, struct nfs_fh *f) +{ + unsigned int len; + + if ((len = ntohl(*p++)) != NFS2_FHSIZE) { + printk(KERN_NOTICE + "lockd: bad fhandle size %d (should be %d)\n", + len, NFS2_FHSIZE); + return NULL; + } + f->size = NFS2_FHSIZE; + memset(f->data, 0, sizeof(f->data)); + memcpy(f->data, p, NFS2_FHSIZE); + return p + XDR_QUADLEN(NFS2_FHSIZE); +} + +static inline u32 * +nlm_encode_fh(u32 *p, struct nfs_fh *f) +{ + *p++ = htonl(NFS2_FHSIZE); + memcpy(p, f->data, NFS2_FHSIZE); + return p + XDR_QUADLEN(NFS2_FHSIZE); +} + +/* + * Encode and decode owner handle + */ +static inline u32 * +nlm_decode_oh(u32 *p, struct xdr_netobj *oh) +{ + return xdr_decode_netobj(p, oh); +} + +static inline u32 * +nlm_encode_oh(u32 *p, struct xdr_netobj *oh) +{ + return xdr_encode_netobj(p, oh); +} + +static inline u32 * +nlm_decode_lock(u32 *p, struct nlm_lock *lock) +{ + struct file_lock *fl = &lock->fl; + s32 start, len, end; + + if (!(p = xdr_decode_string_inplace(p, &lock->caller, + &lock->len, + NLM_MAXSTRLEN)) + || !(p = nlm_decode_fh(p, &lock->fh)) + || !(p = nlm_decode_oh(p, &lock->oh))) + return NULL; + + locks_init_lock(fl); + fl->fl_owner = current->files; + fl->fl_pid = ntohl(*p++); + fl->fl_flags = FL_POSIX; + fl->fl_type = F_RDLCK; /* as good as anything else */ + start = ntohl(*p++); + len = ntohl(*p++); + end = start + len - 1; + + fl->fl_start = s32_to_loff_t(start); + + if (len == 0 || end < 0) + fl->fl_end = OFFSET_MAX; + else + fl->fl_end = s32_to_loff_t(end); + return p; +} + +/* + * Encode a lock as part of an NLM call + */ +static u32 * +nlm_encode_lock(u32 *p, struct nlm_lock *lock) +{ + struct file_lock *fl = &lock->fl; + __s32 start, len; + + if (!(p = xdr_encode_string(p, lock->caller)) + || !(p = nlm_encode_fh(p, &lock->fh)) + || !(p = nlm_encode_oh(p, &lock->oh))) + return NULL; + + if (fl->fl_start > NLM_OFFSET_MAX + || (fl->fl_end > NLM_OFFSET_MAX && fl->fl_end != OFFSET_MAX)) + return NULL; + + start = loff_t_to_s32(fl->fl_start); + if (fl->fl_end == OFFSET_MAX) + len = 0; + else + len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); + + *p++ = htonl(fl->fl_pid); + *p++ = htonl(start); + *p++ = htonl(len); + + return p; +} + +/* + * Encode result of a TEST/TEST_MSG call + */ +static u32 * +nlm_encode_testres(u32 *p, struct nlm_res *resp) +{ + s32 start, len; + + if (!(p = nlm_encode_cookie(p, &resp->cookie))) + return NULL; + *p++ = resp->status; + + if (resp->status == nlm_lck_denied) { + struct file_lock *fl = &resp->lock.fl; + + *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; + *p++ = htonl(fl->fl_pid); + + /* Encode owner handle. */ + if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) + return NULL; + + start = loff_t_to_s32(fl->fl_start); + if (fl->fl_end == OFFSET_MAX) + len = 0; + else + len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); + + *p++ = htonl(start); + *p++ = htonl(len); + } + + return p; +} + + +/* + * First, the server side XDR functions + */ +int +nlmsvc_decode_testargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + u32 exclusive; + + if (!(p = nlm_decode_cookie(p, &argp->cookie))) + return 0; + + exclusive = ntohl(*p++); + if (!(p = nlm_decode_lock(p, &argp->lock))) + return 0; + if (exclusive) + argp->lock.fl.fl_type = F_WRLCK; + + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_encode_testres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_encode_testres(p, resp))) + return 0; + return xdr_ressize_check(rqstp, p); +} + +int +nlmsvc_decode_lockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + u32 exclusive; + + if (!(p = nlm_decode_cookie(p, &argp->cookie))) + return 0; + argp->block = ntohl(*p++); + exclusive = ntohl(*p++); + if (!(p = nlm_decode_lock(p, &argp->lock))) + return 0; + if (exclusive) + argp->lock.fl.fl_type = F_WRLCK; + argp->reclaim = ntohl(*p++); + argp->state = ntohl(*p++); + argp->monitor = 1; /* monitor client by default */ + + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_decode_cancargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + u32 exclusive; + + if (!(p = nlm_decode_cookie(p, &argp->cookie))) + return 0; + argp->block = ntohl(*p++); + exclusive = ntohl(*p++); + if (!(p = nlm_decode_lock(p, &argp->lock))) + return 0; + if (exclusive) + argp->lock.fl.fl_type = F_WRLCK; + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + if (!(p = nlm_decode_cookie(p, &argp->cookie)) + || !(p = nlm_decode_lock(p, &argp->lock))) + return 0; + argp->lock.fl.fl_type = F_UNLCK; + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_decode_shareargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + memset(lock, 0, sizeof(*lock)); + locks_init_lock(&lock->fl); + lock->fl.fl_pid = ~(u32) 0; + + if (!(p = nlm_decode_cookie(p, &argp->cookie)) + || !(p = xdr_decode_string_inplace(p, &lock->caller, + &lock->len, NLM_MAXSTRLEN)) + || !(p = nlm_decode_fh(p, &lock->fh)) + || !(p = nlm_decode_oh(p, &lock->oh))) + return 0; + argp->fsm_mode = ntohl(*p++); + argp->fsm_access = ntohl(*p++); + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_encode_cookie(p, &resp->cookie))) + return 0; + *p++ = resp->status; + *p++ = xdr_zero; /* sequence argument */ + return xdr_ressize_check(rqstp, p); +} + +int +nlmsvc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_encode_cookie(p, &resp->cookie))) + return 0; + *p++ = resp->status; + return xdr_ressize_check(rqstp, p); +} + +int +nlmsvc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = xdr_decode_string_inplace(p, &lock->caller, + &lock->len, NLM_MAXSTRLEN))) + return 0; + argp->state = ntohl(*p++); + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp) +{ + if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) + return 0; + argp->state = ntohl(*p++); + /* Preserve the address in network byte order */ + argp->addr = *p++; + argp->vers = *p++; + argp->proto = *p++; + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_decode_cookie(p, &resp->cookie))) + return 0; + resp->status = ntohl(*p++); + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) +{ + return xdr_argsize_check(rqstp, p); +} + +int +nlmsvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) +{ + return xdr_ressize_check(rqstp, p); +} + +/* + * Now, the client side XDR functions + */ +#ifdef NLMCLNT_SUPPORT_SHARES +static int +nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr) +{ + return 0; +} +#endif + +static int +nlmclt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm_encode_cookie(p, &argp->cookie))) + return -EIO; + *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; + if (!(p = nlm_encode_lock(p, lock))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlmclt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_decode_cookie(p, &resp->cookie))) + return -EIO; + resp->status = ntohl(*p++); + if (resp->status == NLM_LCK_DENIED) { + struct file_lock *fl = &resp->lock.fl; + u32 excl; + s32 start, len, end; + + memset(&resp->lock, 0, sizeof(resp->lock)); + locks_init_lock(fl); + excl = ntohl(*p++); + fl->fl_pid = ntohl(*p++); + if (!(p = nlm_decode_oh(p, &resp->lock.oh))) + return -EIO; + + fl->fl_flags = FL_POSIX; + fl->fl_type = excl? F_WRLCK : F_RDLCK; + start = ntohl(*p++); + len = ntohl(*p++); + end = start + len - 1; + + fl->fl_start = s32_to_loff_t(start); + if (len == 0 || end < 0) + fl->fl_end = OFFSET_MAX; + else + fl->fl_end = s32_to_loff_t(end); + } + return 0; +} + + +static int +nlmclt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm_encode_cookie(p, &argp->cookie))) + return -EIO; + *p++ = argp->block? xdr_one : xdr_zero; + *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; + if (!(p = nlm_encode_lock(p, lock))) + return -EIO; + *p++ = argp->reclaim? xdr_one : xdr_zero; + *p++ = htonl(argp->state); + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlmclt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm_encode_cookie(p, &argp->cookie))) + return -EIO; + *p++ = argp->block? xdr_one : xdr_zero; + *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; + if (!(p = nlm_encode_lock(p, lock))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlmclt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm_encode_cookie(p, &argp->cookie))) + return -EIO; + if (!(p = nlm_encode_lock(p, lock))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlmclt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_encode_cookie(p, &resp->cookie))) + return -EIO; + *p++ = resp->status; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlmclt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_encode_testres(p, resp))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlmclt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm_decode_cookie(p, &resp->cookie))) + return -EIO; + resp->status = ntohl(*p++); + return 0; +} + +/* + * Buffer requirements for NLM + */ +#define NLM_void_sz 0 +#define NLM_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN) +#define NLM_caller_sz 1+XDR_QUADLEN(sizeof(system_utsname.nodename)) +#define NLM_netobj_sz 1+XDR_QUADLEN(XDR_MAX_NETOBJ) +/* #define NLM_owner_sz 1+XDR_QUADLEN(NLM_MAXOWNER) */ +#define NLM_fhandle_sz 1+XDR_QUADLEN(NFS2_FHSIZE) +#define NLM_lock_sz 3+NLM_caller_sz+NLM_netobj_sz+NLM_fhandle_sz +#define NLM_holder_sz 4+NLM_netobj_sz + +#define NLM_testargs_sz NLM_cookie_sz+1+NLM_lock_sz +#define NLM_lockargs_sz NLM_cookie_sz+4+NLM_lock_sz +#define NLM_cancargs_sz NLM_cookie_sz+2+NLM_lock_sz +#define NLM_unlockargs_sz NLM_cookie_sz+NLM_lock_sz + +#define NLM_testres_sz NLM_cookie_sz+1+NLM_holder_sz +#define NLM_res_sz NLM_cookie_sz+1 +#define NLM_norep_sz 0 + +#ifndef MAX +# define MAX(a, b) (((a) > (b))? (a) : (b)) +#endif + +/* + * For NLM, a void procedure really returns nothing + */ +#define nlmclt_decode_norep NULL + +#define PROC(proc, argtype, restype) \ +[NLMPROC_##proc] = { \ + .p_proc = NLMPROC_##proc, \ + .p_encode = (kxdrproc_t) nlmclt_encode_##argtype, \ + .p_decode = (kxdrproc_t) nlmclt_decode_##restype, \ + .p_bufsiz = MAX(NLM_##argtype##_sz, NLM_##restype##_sz) << 2 \ + } + +static struct rpc_procinfo nlm_procedures[] = { + PROC(TEST, testargs, testres), + PROC(LOCK, lockargs, res), + PROC(CANCEL, cancargs, res), + PROC(UNLOCK, unlockargs, res), + PROC(GRANTED, testargs, res), + PROC(TEST_MSG, testargs, norep), + PROC(LOCK_MSG, lockargs, norep), + PROC(CANCEL_MSG, cancargs, norep), + PROC(UNLOCK_MSG, unlockargs, norep), + PROC(GRANTED_MSG, testargs, norep), + PROC(TEST_RES, testres, norep), + PROC(LOCK_RES, res, norep), + PROC(CANCEL_RES, res, norep), + PROC(UNLOCK_RES, res, norep), + PROC(GRANTED_RES, res, norep), +#ifdef NLMCLNT_SUPPORT_SHARES + PROC(SHARE, shareargs, shareres), + PROC(UNSHARE, shareargs, shareres), + PROC(NM_LOCK, lockargs, res), + PROC(FREE_ALL, notify, void), +#endif +}; + +static struct rpc_version nlm_version1 = { + .number = 1, + .nrprocs = 16, + .procs = nlm_procedures, +}; + +static struct rpc_version nlm_version3 = { + .number = 3, + .nrprocs = 24, + .procs = nlm_procedures, +}; + +#ifdef CONFIG_LOCKD_V4 +extern struct rpc_version nlm_version4; +#endif + +static struct rpc_version * nlm_versions[] = { + [1] = &nlm_version1, + [3] = &nlm_version3, +#ifdef CONFIG_LOCKD_V4 + [4] = &nlm_version4, +#endif +}; + +static struct rpc_stat nlm_stats; + +struct rpc_program nlm_program = { + .name = "lockd", + .number = NLM_PROGRAM, + .nrvers = sizeof(nlm_versions) / sizeof(nlm_versions[0]), + .version = nlm_versions, + .stats = &nlm_stats, +}; + +#ifdef RPC_DEBUG +const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) +{ + /* + * We can get away with a static buffer because we're only + * called with BKL held. + */ + static char buf[2*NLM_MAXCOOKIELEN+1]; + int i; + int len = sizeof(buf); + char *p = buf; + + len--; /* allow for trailing \0 */ + if (len < 3) + return "???"; + for (i = 0 ; i < cookie->len ; i++) { + if (len < 2) { + strcpy(p-3, "..."); + break; + } + sprintf(p, "%02x", cookie->data[i]); + p += 2; + len -= 2; + } + *p = '\0'; + + return buf; +} +#endif diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c new file mode 100644 index 0000000..ae4d6b4 --- /dev/null +++ b/fs/lockd/xdr4.c @@ -0,0 +1,580 @@ +/* + * linux/fs/lockd/xdr4.c + * + * XDR support for lockd and the lock client. + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no> + */ + +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/utsname.h> +#include <linux/nfs.h> + +#include <linux/sunrpc/xdr.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/svc.h> +#include <linux/sunrpc/stats.h> +#include <linux/lockd/lockd.h> +#include <linux/lockd/sm_inter.h> + +#define NLMDBG_FACILITY NLMDBG_XDR + +static inline loff_t +s64_to_loff_t(__s64 offset) +{ + return (loff_t)offset; +} + + +static inline s64 +loff_t_to_s64(loff_t offset) +{ + s64 res; + if (offset > NLM4_OFFSET_MAX) + res = NLM4_OFFSET_MAX; + else if (offset < -NLM4_OFFSET_MAX) + res = -NLM4_OFFSET_MAX; + else + res = offset; + return res; +} + +/* + * XDR functions for basic NLM types + */ +static u32 * +nlm4_decode_cookie(u32 *p, struct nlm_cookie *c) +{ + unsigned int len; + + len = ntohl(*p++); + + if(len==0) + { + c->len=4; + memset(c->data, 0, 4); /* hockeypux brain damage */ + } + else if(len<=NLM_MAXCOOKIELEN) + { + c->len=len; + memcpy(c->data, p, len); + p+=XDR_QUADLEN(len); + } + else + { + printk(KERN_NOTICE + "lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN); + return NULL; + } + return p; +} + +static u32 * +nlm4_encode_cookie(u32 *p, struct nlm_cookie *c) +{ + *p++ = htonl(c->len); + memcpy(p, c->data, c->len); + p+=XDR_QUADLEN(c->len); + return p; +} + +static u32 * +nlm4_decode_fh(u32 *p, struct nfs_fh *f) +{ + memset(f->data, 0, sizeof(f->data)); + f->size = ntohl(*p++); + if (f->size > NFS_MAXFHSIZE) { + printk(KERN_NOTICE + "lockd: bad fhandle size %d (should be <=%d)\n", + f->size, NFS_MAXFHSIZE); + return NULL; + } + memcpy(f->data, p, f->size); + return p + XDR_QUADLEN(f->size); +} + +static u32 * +nlm4_encode_fh(u32 *p, struct nfs_fh *f) +{ + *p++ = htonl(f->size); + if (f->size) p[XDR_QUADLEN(f->size)-1] = 0; /* don't leak anything */ + memcpy(p, f->data, f->size); + return p + XDR_QUADLEN(f->size); +} + +/* + * Encode and decode owner handle + */ +static u32 * +nlm4_decode_oh(u32 *p, struct xdr_netobj *oh) +{ + return xdr_decode_netobj(p, oh); +} + +static u32 * +nlm4_encode_oh(u32 *p, struct xdr_netobj *oh) +{ + return xdr_encode_netobj(p, oh); +} + +static u32 * +nlm4_decode_lock(u32 *p, struct nlm_lock *lock) +{ + struct file_lock *fl = &lock->fl; + __s64 len, start, end; + + if (!(p = xdr_decode_string_inplace(p, &lock->caller, + &lock->len, NLM_MAXSTRLEN)) + || !(p = nlm4_decode_fh(p, &lock->fh)) + || !(p = nlm4_decode_oh(p, &lock->oh))) + return NULL; + + locks_init_lock(fl); + fl->fl_owner = current->files; + fl->fl_pid = ntohl(*p++); + fl->fl_flags = FL_POSIX; + fl->fl_type = F_RDLCK; /* as good as anything else */ + p = xdr_decode_hyper(p, &start); + p = xdr_decode_hyper(p, &len); + end = start + len - 1; + + fl->fl_start = s64_to_loff_t(start); + + if (len == 0 || end < 0) + fl->fl_end = OFFSET_MAX; + else + fl->fl_end = s64_to_loff_t(end); + return p; +} + +/* + * Encode a lock as part of an NLM call + */ +static u32 * +nlm4_encode_lock(u32 *p, struct nlm_lock *lock) +{ + struct file_lock *fl = &lock->fl; + __s64 start, len; + + if (!(p = xdr_encode_string(p, lock->caller)) + || !(p = nlm4_encode_fh(p, &lock->fh)) + || !(p = nlm4_encode_oh(p, &lock->oh))) + return NULL; + + if (fl->fl_start > NLM4_OFFSET_MAX + || (fl->fl_end > NLM4_OFFSET_MAX && fl->fl_end != OFFSET_MAX)) + return NULL; + + *p++ = htonl(fl->fl_pid); + + start = loff_t_to_s64(fl->fl_start); + if (fl->fl_end == OFFSET_MAX) + len = 0; + else + len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1); + + p = xdr_encode_hyper(p, start); + p = xdr_encode_hyper(p, len); + + return p; +} + +/* + * Encode result of a TEST/TEST_MSG call + */ +static u32 * +nlm4_encode_testres(u32 *p, struct nlm_res *resp) +{ + s64 start, len; + + dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp); + if (!(p = nlm4_encode_cookie(p, &resp->cookie))) + return NULL; + *p++ = resp->status; + + if (resp->status == nlm_lck_denied) { + struct file_lock *fl = &resp->lock.fl; + + *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; + *p++ = htonl(fl->fl_pid); + + /* Encode owner handle. */ + if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) + return NULL; + + start = loff_t_to_s64(fl->fl_start); + if (fl->fl_end == OFFSET_MAX) + len = 0; + else + len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1); + + p = xdr_encode_hyper(p, start); + p = xdr_encode_hyper(p, len); + dprintk("xdr: encode_testres (status %d pid %d type %d start %Ld end %Ld)\n", + resp->status, fl->fl_pid, fl->fl_type, + (long long)fl->fl_start, (long long)fl->fl_end); + } + + dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp); + return p; +} + + +/* + * First, the server side XDR functions + */ +int +nlm4svc_decode_testargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + u32 exclusive; + + if (!(p = nlm4_decode_cookie(p, &argp->cookie))) + return 0; + + exclusive = ntohl(*p++); + if (!(p = nlm4_decode_lock(p, &argp->lock))) + return 0; + if (exclusive) + argp->lock.fl.fl_type = F_WRLCK; + + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_encode_testres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_encode_testres(p, resp))) + return 0; + return xdr_ressize_check(rqstp, p); +} + +int +nlm4svc_decode_lockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + u32 exclusive; + + if (!(p = nlm4_decode_cookie(p, &argp->cookie))) + return 0; + argp->block = ntohl(*p++); + exclusive = ntohl(*p++); + if (!(p = nlm4_decode_lock(p, &argp->lock))) + return 0; + if (exclusive) + argp->lock.fl.fl_type = F_WRLCK; + argp->reclaim = ntohl(*p++); + argp->state = ntohl(*p++); + argp->monitor = 1; /* monitor client by default */ + + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_decode_cancargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + u32 exclusive; + + if (!(p = nlm4_decode_cookie(p, &argp->cookie))) + return 0; + argp->block = ntohl(*p++); + exclusive = ntohl(*p++); + if (!(p = nlm4_decode_lock(p, &argp->lock))) + return 0; + if (exclusive) + argp->lock.fl.fl_type = F_WRLCK; + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + if (!(p = nlm4_decode_cookie(p, &argp->cookie)) + || !(p = nlm4_decode_lock(p, &argp->lock))) + return 0; + argp->lock.fl.fl_type = F_UNLCK; + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_decode_shareargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + memset(lock, 0, sizeof(*lock)); + locks_init_lock(&lock->fl); + lock->fl.fl_pid = ~(u32) 0; + + if (!(p = nlm4_decode_cookie(p, &argp->cookie)) + || !(p = xdr_decode_string_inplace(p, &lock->caller, + &lock->len, NLM_MAXSTRLEN)) + || !(p = nlm4_decode_fh(p, &lock->fh)) + || !(p = nlm4_decode_oh(p, &lock->oh))) + return 0; + argp->fsm_mode = ntohl(*p++); + argp->fsm_access = ntohl(*p++); + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_encode_cookie(p, &resp->cookie))) + return 0; + *p++ = resp->status; + *p++ = xdr_zero; /* sequence argument */ + return xdr_ressize_check(rqstp, p); +} + +int +nlm4svc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_encode_cookie(p, &resp->cookie))) + return 0; + *p++ = resp->status; + return xdr_ressize_check(rqstp, p); +} + +int +nlm4svc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = xdr_decode_string_inplace(p, &lock->caller, + &lock->len, NLM_MAXSTRLEN))) + return 0; + argp->state = ntohl(*p++); + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp) +{ + if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) + return 0; + argp->state = ntohl(*p++); + /* Preserve the address in network byte order */ + argp->addr = *p++; + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_decode_cookie(p, &resp->cookie))) + return 0; + resp->status = ntohl(*p++); + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) +{ + return xdr_argsize_check(rqstp, p); +} + +int +nlm4svc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) +{ + return xdr_ressize_check(rqstp, p); +} + +/* + * Now, the client side XDR functions + */ +#ifdef NLMCLNT_SUPPORT_SHARES +static int +nlm4clt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr) +{ + return 0; +} +#endif + +static int +nlm4clt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm4_encode_cookie(p, &argp->cookie))) + return -EIO; + *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; + if (!(p = nlm4_encode_lock(p, lock))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlm4clt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_decode_cookie(p, &resp->cookie))) + return -EIO; + resp->status = ntohl(*p++); + if (resp->status == NLM_LCK_DENIED) { + struct file_lock *fl = &resp->lock.fl; + u32 excl; + s64 start, end, len; + + memset(&resp->lock, 0, sizeof(resp->lock)); + locks_init_lock(fl); + excl = ntohl(*p++); + fl->fl_pid = ntohl(*p++); + if (!(p = nlm4_decode_oh(p, &resp->lock.oh))) + return -EIO; + + fl->fl_flags = FL_POSIX; + fl->fl_type = excl? F_WRLCK : F_RDLCK; + p = xdr_decode_hyper(p, &start); + p = xdr_decode_hyper(p, &len); + end = start + len - 1; + + fl->fl_start = s64_to_loff_t(start); + if (len == 0 || end < 0) + fl->fl_end = OFFSET_MAX; + else + fl->fl_end = s64_to_loff_t(end); + } + return 0; +} + + +static int +nlm4clt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm4_encode_cookie(p, &argp->cookie))) + return -EIO; + *p++ = argp->block? xdr_one : xdr_zero; + *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; + if (!(p = nlm4_encode_lock(p, lock))) + return -EIO; + *p++ = argp->reclaim? xdr_one : xdr_zero; + *p++ = htonl(argp->state); + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlm4clt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm4_encode_cookie(p, &argp->cookie))) + return -EIO; + *p++ = argp->block? xdr_one : xdr_zero; + *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; + if (!(p = nlm4_encode_lock(p, lock))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlm4clt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp) +{ + struct nlm_lock *lock = &argp->lock; + + if (!(p = nlm4_encode_cookie(p, &argp->cookie))) + return -EIO; + if (!(p = nlm4_encode_lock(p, lock))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlm4clt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_encode_cookie(p, &resp->cookie))) + return -EIO; + *p++ = resp->status; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlm4clt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_encode_testres(p, resp))) + return -EIO; + req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + return 0; +} + +static int +nlm4clt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp) +{ + if (!(p = nlm4_decode_cookie(p, &resp->cookie))) + return -EIO; + resp->status = ntohl(*p++); + return 0; +} + +/* + * Buffer requirements for NLM + */ +#define NLM4_void_sz 0 +#define NLM4_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN) +#define NLM4_caller_sz 1+XDR_QUADLEN(NLM_MAXSTRLEN) +#define NLM4_netobj_sz 1+XDR_QUADLEN(XDR_MAX_NETOBJ) +/* #define NLM4_owner_sz 1+XDR_QUADLEN(NLM4_MAXOWNER) */ +#define NLM4_fhandle_sz 1+XDR_QUADLEN(NFS3_FHSIZE) +#define NLM4_lock_sz 5+NLM4_caller_sz+NLM4_netobj_sz+NLM4_fhandle_sz +#define NLM4_holder_sz 6+NLM4_netobj_sz + +#define NLM4_testargs_sz NLM4_cookie_sz+1+NLM4_lock_sz +#define NLM4_lockargs_sz NLM4_cookie_sz+4+NLM4_lock_sz +#define NLM4_cancargs_sz NLM4_cookie_sz+2+NLM4_lock_sz +#define NLM4_unlockargs_sz NLM4_cookie_sz+NLM4_lock_sz + +#define NLM4_testres_sz NLM4_cookie_sz+1+NLM4_holder_sz +#define NLM4_res_sz NLM4_cookie_sz+1 +#define NLM4_norep_sz 0 + +#ifndef MAX +# define MAX(a,b) (((a) > (b))? (a) : (b)) +#endif + +/* + * For NLM, a void procedure really returns nothing + */ +#define nlm4clt_decode_norep NULL + +#define PROC(proc, argtype, restype) \ +[NLMPROC_##proc] = { \ + .p_proc = NLMPROC_##proc, \ + .p_encode = (kxdrproc_t) nlm4clt_encode_##argtype, \ + .p_decode = (kxdrproc_t) nlm4clt_decode_##restype, \ + .p_bufsiz = MAX(NLM4_##argtype##_sz, NLM4_##restype##_sz) << 2 \ + } + +static struct rpc_procinfo nlm4_procedures[] = { + PROC(TEST, testargs, testres), + PROC(LOCK, lockargs, res), + PROC(CANCEL, cancargs, res), + PROC(UNLOCK, unlockargs, res), + PROC(GRANTED, testargs, res), + PROC(TEST_MSG, testargs, norep), + PROC(LOCK_MSG, lockargs, norep), + PROC(CANCEL_MSG, cancargs, norep), + PROC(UNLOCK_MSG, unlockargs, norep), + PROC(GRANTED_MSG, testargs, norep), + PROC(TEST_RES, testres, norep), + PROC(LOCK_RES, res, norep), + PROC(CANCEL_RES, res, norep), + PROC(UNLOCK_RES, res, norep), + PROC(GRANTED_RES, res, norep), +#ifdef NLMCLNT_SUPPORT_SHARES + PROC(SHARE, shareargs, shareres), + PROC(UNSHARE, shareargs, shareres), + PROC(NM_LOCK, lockargs, res), + PROC(FREE_ALL, notify, void), +#endif +}; + +struct rpc_version nlm_version4 = { + .number = 4, + .nrprocs = 24, + .procs = nlm4_procedures, +}; |
