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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/lockd/svcproc.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/lockd/svcproc.c')
-rw-r--r-- | fs/lockd/svcproc.c | 606 |
1 files changed, 606 insertions, 0 deletions
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c new file mode 100644 index 000000000000..757e344cf200 --- /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), + +}; 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