cregit-Linux how code gets into the kernel

Release 4.10 fs/nfs/mount_clnt.c

Directory: fs/nfs
/*
 * In-kernel MOUNT protocol client
 *
 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/uio.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/sched.h>
#include <linux/nfs_fs.h>
#include "internal.h"


#define NFSDBG_FACILITY	NFSDBG_MOUNT

/*
 * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
 */

#define MNTPATHLEN		(1024)

/*
 * XDR data type sizes
 */

#define encode_dirpath_sz	(1 + XDR_QUADLEN(MNTPATHLEN))

#define MNT_status_sz		(1)

#define MNT_fhs_status_sz	(1)

#define MNT_fhandle_sz		XDR_QUADLEN(NFS2_FHSIZE)

#define MNT_fhandle3_sz		(1 + XDR_QUADLEN(NFS3_FHSIZE))

#define MNT_authflav3_sz	(1 + NFS_MAX_SECFLAVORS)

/*
 * XDR argument and result sizes
 */

#define MNT_enc_dirpath_sz	encode_dirpath_sz

#define MNT_dec_mountres_sz	(MNT_status_sz + MNT_fhandle_sz)

#define MNT_dec_mountres3_sz	(MNT_status_sz + MNT_fhandle_sz + \
                                 MNT_authflav3_sz)

/*
 * Defined by RFC 1094, section A.5
 */
enum {
	
MOUNTPROC_NULL		= 0,
	
MOUNTPROC_MNT		= 1,
	
MOUNTPROC_DUMP		= 2,
	
MOUNTPROC_UMNT		= 3,
	
MOUNTPROC_UMNTALL	= 4,
	
MOUNTPROC_EXPORT	= 5,
};

/*
 * Defined by RFC 1813, section 5.2
 */
enum {
	
MOUNTPROC3_NULL		= 0,
	
MOUNTPROC3_MNT		= 1,
	
MOUNTPROC3_DUMP		= 2,
	
MOUNTPROC3_UMNT		= 3,
	
MOUNTPROC3_UMNTALL	= 4,
	
MOUNTPROC3_EXPORT	= 5,
};


static const struct rpc_program mnt_program;

/*
 * Defined by OpenGroup XNFS Version 3W, chapter 8
 */

enum mountstat {
	
MNT_OK			= 0,
	
MNT_EPERM		= 1,
	
MNT_ENOENT		= 2,
	
MNT_EACCES		= 13,
	
MNT_EINVAL		= 22,
};

static struct {
	
u32 status;
	
int errno;
} 
mnt_errtbl[] = {
	{ .status = MNT_OK,			.errno = 0,               },
	{ .status = MNT_EPERM,			.errno = -EPERM,       },
	{ .status = MNT_ENOENT,			.errno = -ENOENT,       },
	{ .status = MNT_EACCES,			.errno = -EACCES,       },
	{ .status = MNT_EINVAL,			.errno = -EINVAL,       },
};

/*
 * Defined by RFC 1813, section 5.1.5
 */

enum mountstat3 {
	
MNT3_OK			= 0,		/* no error */
	
MNT3ERR_PERM		= 1,		/* Not owner */
	
MNT3ERR_NOENT		= 2,		/* No such file or directory */
	
MNT3ERR_IO		= 5,		/* I/O error */
	
MNT3ERR_ACCES		= 13,		/* Permission denied */
	
MNT3ERR_NOTDIR		= 20,		/* Not a directory */
	
MNT3ERR_INVAL		= 22,		/* Invalid argument */
	
MNT3ERR_NAMETOOLONG	= 63,		/* Filename too long */
	
MNT3ERR_NOTSUPP		= 10004,	/* Operation not supported */
	
MNT3ERR_SERVERFAULT	= 10006,	/* A failure on the server */
};

static struct {
	
u32 status;
	
int errno;
} 
mnt3_errtbl[] = {
	{ .status = MNT3_OK,			.errno = 0,               },
	{ .status = MNT3ERR_PERM,		.errno = -EPERM,       },
	{ .status = MNT3ERR_NOENT,		.errno = -ENOENT,       },
	{ .status = MNT3ERR_IO,			.errno = -EIO,               },
	{ .status = MNT3ERR_ACCES,		.errno = -EACCES,       },
	{ .status = MNT3ERR_NOTDIR,		.errno = -ENOTDIR,       },
	{ .status = MNT3ERR_INVAL,		.errno = -EINVAL,       },
	{ .status = MNT3ERR_NAMETOOLONG,	.errno = -ENAMETOOLONG,       },
	{ .status = MNT3ERR_NOTSUPP,		.errno = -ENOTSUPP,       },
	{ .status = MNT3ERR_SERVERFAULT,	.errno = -EREMOTEIO,       },
};


struct mountres {
	
int errno;
	
struct nfs_fh *fh;
	
unsigned int *auth_count;
	
rpc_authflavor_t *auth_flavors;
};


struct mnt_fhstatus {
	
u32 status;
	
struct nfs_fh *fh;
};

/**
 * nfs_mount - Obtain an NFS file handle for the given host and path
 * @info: pointer to mount request arguments
 *
 * Uses default timeout parameters specified by underlying transport. On
 * successful return, the auth_flavs list and auth_flav_len will be populated
 * with the list from the server or a faked-up list if the server didn't
 * provide one.
 */

int nfs_mount(struct nfs_mount_request *info) { struct mountres result = { .fh = info->fh, .auth_count = info->auth_flav_len, .auth_flavors = info->auth_flavs, }; struct rpc_message msg = { .rpc_argp = info->dirpath, .rpc_resp = &result, }; struct rpc_create_args args = { .net = info->net, .protocol = info->protocol, .address = info->sap, .addrsize = info->salen, .servername = info->hostname, .program = &mnt_program, .version = info->version, .authflavor = RPC_AUTH_UNIX, }; struct rpc_clnt *mnt_clnt; int status; dprintk("NFS: sending MNT request for %s:%s\n", (info->hostname ? info->hostname : "server"), info->dirpath); if (strlen(info->dirpath) > MNTPATHLEN) return -ENAMETOOLONG; if (info->noresvport) args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; mnt_clnt = rpc_create(&args); if (IS_ERR(mnt_clnt)) goto out_clnt_err; if (info->version == NFS_MNT3_VERSION) msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; else msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT]; status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT); rpc_shutdown_client(mnt_clnt); if (status < 0) goto out_call_err; if (result.errno != 0) goto out_mnt_err; dprintk("NFS: MNT request succeeded\n"); status = 0; /* * If the server didn't provide a flavor list, allow the * client to try any flavor. */ if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) { dprintk("NFS: Faking up auth_flavs list\n"); info->auth_flavs[0] = RPC_AUTH_NULL; *info->auth_flav_len = 1; } out: return status; out_clnt_err: status = PTR_ERR(mnt_clnt); dprintk("NFS: failed to create MNT RPC client, status=%d\n", status); goto out; out_call_err: dprintk("NFS: MNT request failed, status=%d\n", status); goto out; out_mnt_err: dprintk("NFS: MNT server returned result %d\n", result.errno); status = result.errno; goto out; }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever23965.48%838.10%
pre-gitpre-git4512.33%314.29%
jeff laytonjeff layton3910.68%14.76%
trond myklebusttrond myklebust277.40%314.29%
pavel emelianovpavel emelianov41.10%14.76%
stanislav kinsburskystanislav kinsbursky30.82%14.76%
scott mayhewscott mayhew30.82%14.76%
steve dicksonsteve dickson20.55%14.76%
art haasart haas20.55%14.76%
dave jonesdave jones10.27%14.76%
Total365100.00%21100.00%

/** * nfs_umount - Notify a server that we have unmounted this export * @info: pointer to umount request arguments * * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always * use UDP. */
void nfs_umount(const struct nfs_mount_request *info) { static const struct rpc_timeout nfs_umnt_timeout = { .to_initval = 1 * HZ, .to_maxval = 3 * HZ, .to_retries = 2, }; struct rpc_create_args args = { .net = info->net, .protocol = IPPROTO_UDP, .address = info->sap, .addrsize = info->salen, .timeout = &nfs_umnt_timeout, .servername = info->hostname, .program = &mnt_program, .version = info->version, .authflavor = RPC_AUTH_UNIX, .flags = RPC_CLNT_CREATE_NOPING, }; struct rpc_message msg = { .rpc_argp = info->dirpath, }; struct rpc_clnt *clnt; int status; if (strlen(info->dirpath) > MNTPATHLEN) return; if (info->noresvport) args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; clnt = rpc_create(&args); if (IS_ERR(clnt)) goto out_clnt_err; dprintk("NFS: sending UMNT request for %s:%s\n", (info->hostname ? info->hostname : "server"), info->dirpath); if (info->version == NFS_MNT3_VERSION) msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT]; else msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT]; status = rpc_call_sync(clnt, &msg, 0); rpc_shutdown_client(clnt); if (unlikely(status < 0)) goto out_call_err; return; out_clnt_err: dprintk("NFS: failed to create UMNT RPC client, status=%ld\n", PTR_ERR(clnt)); return; out_call_err: dprintk("NFS: UMNT request failed, status=%d\n", status); }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever25693.09%125.00%
trond myklebusttrond myklebust124.36%125.00%
pavel emelianovpavel emelianov41.45%125.00%
stanislav kinsburskystanislav kinsbursky31.09%125.00%
Total275100.00%4100.00%

/* * XDR encode/decode functions for MOUNT */
static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) { const u32 pathname_len = strlen(pathname); __be32 *p; p = xdr_reserve_space(xdr, 4 + pathname_len); xdr_encode_opaque(p, pathname, pathname_len); }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever49100.00%2100.00%
Total49100.00%2100.00%


static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr, const char *dirpath) { encode_mntdirpath(xdr, dirpath); }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever28100.00%3100.00%
Total28100.00%3100.00%

/* * RFC 1094: "A non-zero status indicates some sort of error. In this * case, the status is a UNIX error number." This can be problematic * if the server and client use different errno values for the same * error. * * However, the OpenGroup XNFS spec provides a simple mapping that is * independent of local errno values on the server and the client. */
static int decode_status(struct xdr_stream *xdr, struct mountres *res) { unsigned int i; u32 status; __be32 *p; p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; status = be32_to_cpup(p); for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) { if (mnt_errtbl[i].status == status) { res->errno = mnt_errtbl[i].errno; return 0; } } dprintk("NFS: unrecognized MNT status code: %u\n", status); res->errno = -EACCES; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever11799.15%266.67%
roel kluinroel kluin10.85%133.33%
Total118100.00%3100.00%


static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res) { struct nfs_fh *fh = res->fh; __be32 *p; p = xdr_inline_decode(xdr, NFS2_FHSIZE); if (unlikely(p == NULL)) return -EIO; fh->size = NFS2_FHSIZE; memcpy(fh->data, p, NFS2_FHSIZE); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever71100.00%1100.00%
Total71100.00%1100.00%


static int mnt_xdr_dec_mountres(struct rpc_rqst *req, struct xdr_stream *xdr, struct mountres *res) { int status; status = decode_status(xdr, res); if (unlikely(status != 0 || res->errno != 0)) return status; return decode_fhandle(xdr, res); }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever59100.00%2100.00%
Total59100.00%2100.00%


static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) { unsigned int i; u32 status; __be32 *p; p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; status = be32_to_cpup(p); for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) { if (mnt3_errtbl[i].status == status) { res->errno = mnt3_errtbl[i].errno; return 0; } } dprintk("NFS: unrecognized MNT3 status code: %u\n", status); res->errno = -EACCES; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever11799.15%266.67%
roel kluinroel kluin10.85%133.33%
Total118100.00%3100.00%


static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res) { struct nfs_fh *fh = res->fh; u32 size; __be32 *p; p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; size = be32_to_cpup(p); if (size > NFS3_FHSIZE || size == 0) return -EIO; p = xdr_inline_decode(xdr, size); if (unlikely(p == NULL)) return -EIO; fh->size = size; memcpy(fh->data, p, size); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever117100.00%2100.00%
Total117100.00%2100.00%


static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res) { rpc_authflavor_t *flavors = res->auth_flavors; unsigned int *count = res->auth_count; u32 entries, i; __be32 *p; if (*count == 0) return 0; p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; entries = be32_to_cpup(p); dprintk("NFS: received %u auth flavors\n", entries); if (entries > NFS_MAX_SECFLAVORS) entries = NFS_MAX_SECFLAVORS; p = xdr_inline_decode(xdr, 4 * entries); if (unlikely(p == NULL)) return -EIO; if (entries > *count) entries = *count; for (i = 0; i < entries; i++) { flavors[i] = be32_to_cpup(p++); dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]); } *count = i; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever180100.00%3100.00%
Total180100.00%3100.00%


static int mnt_xdr_dec_mountres3(struct rpc_rqst *req, struct xdr_stream *xdr, struct mountres *res) { int status; status = decode_fhs_status(xdr, res); if (unlikely(status != 0 || res->errno != 0)) return status; status = decode_fhandle3(xdr, res); if (unlikely(status != 0)) { res->errno = -EBADHANDLE; return 0; } return decode_auth_flavors(xdr, res); }

Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever89100.00%2100.00%
Total89100.00%2100.00%

static struct rpc_procinfo mnt_procedures[] = { [MOUNTPROC_MNT] = { .p_proc = MOUNTPROC_MNT, .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres, .p_arglen = MNT_enc_dirpath_sz, .p_replen = MNT_dec_mountres_sz, .p_statidx = MOUNTPROC_MNT, .p_name = "MOUNT", }, [MOUNTPROC_UMNT] = { .p_proc = MOUNTPROC_UMNT, .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, .p_arglen = MNT_enc_dirpath_sz, .p_statidx = MOUNTPROC_UMNT, .p_name = "UMOUNT", }, }; static struct rpc_procinfo mnt3_procedures[] = { [MOUNTPROC3_MNT] = { .p_proc = MOUNTPROC3_MNT, .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres3, .p_arglen = MNT_enc_dirpath_sz, .p_replen = MNT_dec_mountres3_sz, .p_statidx = MOUNTPROC3_MNT, .p_name = "MOUNT", }, [MOUNTPROC3_UMNT] = { .p_proc = MOUNTPROC3_UMNT, .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, .p_arglen = MNT_enc_dirpath_sz, .p_statidx = MOUNTPROC3_UMNT, .p_name = "UMOUNT", }, }; static const struct rpc_version mnt_version1 = { .number = 1, .nrprocs = ARRAY_SIZE(mnt_procedures), .procs = mnt_procedures, }; static const struct rpc_version mnt_version3 = { .number = 3, .nrprocs = ARRAY_SIZE(mnt3_procedures), .procs = mnt3_procedures, }; static const struct rpc_version *mnt_version[] = { NULL, &mnt_version1, NULL, &mnt_version3, }; static struct rpc_stat mnt_stats; static const struct rpc_program mnt_program = { .name = "mount", .number = NFS_MNT_PROGRAM, .nrvers = ARRAY_SIZE(mnt_version), .version = mnt_version, .stats = &mnt_stats, };

Overall Contributors

PersonTokensPropCommitsCommitProp
chuck leverchuck lever187383.36%2152.50%
pre-gitpre-git1928.54%37.50%
trond myklebusttrond myklebust572.54%717.50%
art haasart haas421.87%12.50%
jeff laytonjeff layton401.78%12.50%
dave jonesdave jones180.80%12.50%
pavel emelianovpavel emelianov80.36%12.50%
stanislav kinsburskystanislav kinsbursky60.27%12.50%
steve dicksonsteve dickson50.22%12.50%
scott mayhewscott mayhew30.13%12.50%
roel kluinroel kluin20.09%12.50%
tobias klausertobias klauser10.04%12.50%
Total2247100.00%40100.00%
Directory: fs/nfs
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.