The 'nfsref' command administers junctions. On an NFS server, it can create new junctions, remove existing junctions, or display the contents of junctions. A man page with more details is included. Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> --- configure.ac | 1 utils/Makefile.am | 4 + utils/nfsref/Makefile.am | 39 +++++++ utils/nfsref/add.c | 271 ++++++++++++++++++++++++++++++++++++++++++++++ utils/nfsref/lookup.c | 211 ++++++++++++++++++++++++++++++++++++ utils/nfsref/nfsref.c | 188 ++++++++++++++++++++++++++++++++ utils/nfsref/nfsref.h | 47 ++++++++ utils/nfsref/nfsref.man | 180 +++++++++++++++++++++++++++++++ utils/nfsref/remove.c | 145 +++++++++++++++++++++++++ 9 files changed, 1086 insertions(+) create mode 100644 utils/nfsref/Makefile.am create mode 100644 utils/nfsref/add.c create mode 100644 utils/nfsref/lookup.c create mode 100644 utils/nfsref/nfsref.c create mode 100644 utils/nfsref/nfsref.h create mode 100644 utils/nfsref/nfsref.man create mode 100644 utils/nfsref/remove.c diff --git a/configure.ac b/configure.ac index 8e7f036..59199f9 100644 --- a/configure.ac +++ b/configure.ac @@ -604,6 +604,7 @@ AC_CONFIG_FILES([ utils/mount/Makefile utils/mountd/Makefile utils/nfsd/Makefile + utils/nfsref/Makefile utils/nfsstat/Makefile utils/nfsidmap/Makefile utils/showmount/Makefile diff --git a/utils/Makefile.am b/utils/Makefile.am index c75a5a0..d361aea 100644 --- a/utils/Makefile.am +++ b/utils/Makefile.am @@ -23,6 +23,10 @@ if CONFIG_NFSDCLTRACK OPTDIRS += nfsdcltrack endif +if CONFIG_JUNCTION +OPTDIRS += nfsref +endif + SUBDIRS = \ exportfs \ mountd \ diff --git a/utils/nfsref/Makefile.am b/utils/nfsref/Makefile.am new file mode 100644 index 0000000..2b2bb53 --- /dev/null +++ b/utils/nfsref/Makefile.am @@ -0,0 +1,39 @@ +## +## @file utils/nfsref/Makefile.am +## @brief Process this file with automake to produce utils/nfsref/Makefile.in +## + +## +## Copyright 2011, 2018 Oracle. All rights reserved. +## +## This file is part of nfs-utils. +## +## nfs-utils is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License version 2.0 as +## published by the Free Software Foundation. +## +## nfs-utils is distributed in the hope that it will be useful, but +## WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License version 2.0 for more details. +## +## You should have received a copy of the GNU General Public License +## version 2.0 along with nfs-utils. If not, see: +## +## http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt +## + +noinst_HEADERS = nfsref.h + +sbin_PROGRAMS = nfsref +nfsref_SOURCES = add.c lookup.c nfsref.c remove.c +LDADD = $(LIBXML2) $(LIBCAP) \ + ../../support/nfs/libnfs.la \ + ../../support/junction/libjunction.la + +man8_MANS = nfsref.man + +MAINTAINERCLEANFILES = Makefile.in + +AM_CPPFLAGS = -I. -I../../support/include +##AM_LDFLAGS = -Wl,--as-needed diff --git a/utils/nfsref/add.c b/utils/nfsref/add.c new file mode 100644 index 0000000..d5d0cf8 --- /dev/null +++ b/utils/nfsref/add.c @@ -0,0 +1,271 @@ +/** + * @file utils/nfsref/add.c + * @brief Add junction metadata to a local file system object + */ + +/* + * Copyright 2011, 2018 Oracle. All rights reserved. + * + * This file is part of nfs-utils. + * + * nfs-utils is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2.0 as + * published by the Free Software Foundation. + * + * nfs-utils is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2.0 for more details. + * + * You should have received a copy of the GNU General Public License + * version 2.0 along with nfs-utils. If not, see: + * + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt + */ + +#include <sys/stat.h> +#include <sys/types.h> + +#include <stdbool.h> +#include <stdint.h> +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <errno.h> + +#include <uuid/uuid.h> + +#include "junction.h" +#include "xlog.h" +#include "nfsref.h" + +/** + * Default cache expiration for FSN information + */ +#define FSN_DEFAULT_TTL (300) + +/** + * Display help message for "add" subcommand + * + * @param progname NUL-terminated C string containing name of program + * @return program exit status + */ +int +nfsref_add_help(const char *progname) +{ + fprintf(stderr, " \n"); + + fprintf(stderr, "Usage: %s [ -t type ] add <junction path> " + "<server> <export> [ <server> <export> ... ]\n\n", + progname); + + fprintf(stderr, "Add a new junction containing the specified list " + "of fileset locations.\n"); + fprintf(stderr, "<junction path> is the filename of the new junction. " + "<server> is the hostname\n"); + fprintf(stderr, "or IP address of an NFS server where the fileset is " + "located. <export> is the\n"); + fprintf(stderr, "export pathname of the fileset on that server.\n\n"); + + fprintf(stderr, "For NFS basic junctions, the location list is stored " + "locally in the junction.\n"); + fprintf(stderr, "For FedFS junctions, the location list is stored " + "as new FSN and FSL records\n"); + fprintf(stderr, "on an NSDB.\n"); + + return EXIT_SUCCESS; +} + +/** + * Fill in default settings for NFSv4.0 fs_locations4 + * + * @param new NFS location structure to fill in + * + * See section 5.1.3.2 of the NSDB protocol draft. + */ +static void +nfsref_add_fsloc_defaults(struct nfs_fsloc *new) +{ + new->nfl_hostport = 0; + new->nfl_flags.nfl_varsub = false; + new->nfl_currency = -1; + new->nfl_validfor = 0; + new->nfl_genflags.nfl_writable = false; + new->nfl_genflags.nfl_going = false; + new->nfl_genflags.nfl_split = true; + new->nfl_transflags.nfl_rdma = true; + new->nfl_info.nfl_simul = 0; + new->nfl_info.nfl_handle = 0; + new->nfl_info.nfl_fileid = 0; + new->nfl_info.nfl_writever = 0; + new->nfl_info.nfl_change = 0; + new->nfl_info.nfl_readdir = 0; + new->nfl_info.nfl_readrank = 0; + new->nfl_info.nfl_readorder = 0; + new->nfl_info.nfl_writerank = 0; + new->nfl_info.nfl_writeorder = 0; +} + +/** + * Convert a pair of command line arguments to one nfs_fsloc structure + * + * @param server NUL-terminated C string containing file server hostname + * @param rootpath NUL-terminated C string containing POSIX-style export path + * @param fsloc OUT: NFS location structure + * @return a FedFsStatus code + * + * If nfsref_add_build_fsloc() returns FEDFS_OK, caller must free the + * returned fsloc with nfs_free_location(). + */ +static FedFsStatus +nfsref_add_build_fsloc(const char *server, const char *rootpath, + struct nfs_fsloc **fsloc) +{ + struct nfs_fsloc *new; + FedFsStatus retval; + + if (server == NULL || rootpath == NULL) + return FEDFS_ERR_INVAL; + + xlog(D_GENERAL, "%s: Building fsloc for %s:%s", + __func__, server, rootpath); + + new = nfs_new_location(); + if (new == NULL) { + xlog(D_GENERAL, "%s: No memory", __func__); + return FEDFS_ERR_SVRFAULT; + } + + new->nfl_hostname = strdup(server); + if (new->nfl_hostname == NULL) { + nfs_free_location(new); + xlog(D_GENERAL, "%s: No memory", __func__); + return FEDFS_ERR_SVRFAULT; + } + + retval = nsdb_posix_to_path_array(rootpath, &new->nfl_rootpath); + if (retval != FEDFS_OK) { + nfs_free_location(new); + return retval; + } + + nfsref_add_fsloc_defaults(new); + *fsloc = new; + return FEDFS_OK; +} + +/** + * Convert array of command line arguments to list of nfs_fsloc structures + * + * @param argv array of pointers to NUL-terminated C strings contains arguments + * @param optind index of "argv" where "add" subcommand arguments start + * @param fslocs OUT: list of NFS locations + * @return a FedFsStatus code + * + * If nfsref_add_build_fsloc_list() returns FEDFS_OK, caller must free the + * returned list of fslocs with nfs_free_locations(). + */ +static FedFsStatus +nfsref_add_build_fsloc_list(char **argv, int optind, struct nfs_fsloc **fslocs) +{ + struct nfs_fsloc *fsloc, *result = NULL; + FedFsStatus retval; + int i; + + for (i = optind + 2; argv[i] != NULL; i += 2) { + retval = nfsref_add_build_fsloc(argv[i], argv[i + 1], &fsloc); + if (retval != FEDFS_OK) { + nfs_free_locations(result); + return retval; + } + if (result == NULL) + result = fsloc; + else + result->nfl_next = fsloc; + } + if (result == NULL) + return FEDFS_ERR_INVAL; + + *fslocs = result; + return FEDFS_OK; +} + +/** + * Add NFS locations to a junction + * + * @param junct_path NUL-terminated C string containing pathname of junction + * @param argv array of pointers to NUL-terminated C strings contains arguments + * @param optind index of "argv" where "add" subcommand arguments start + * @return program exit status + */ +static int +nfsref_add_nfs_basic(const char *junct_path, char **argv, int optind) +{ + struct nfs_fsloc *fslocs = NULL; + FedFsStatus retval; + + xlog(D_GENERAL, "%s: Adding basic junction to %s", + __func__, junct_path); + + retval = nfsref_add_build_fsloc_list(argv, optind, &fslocs); + switch (retval) { + case FEDFS_OK: + break; + case FEDFS_ERR_INVAL: + xlog(L_ERROR, "Missing arguments"); + return EXIT_FAILURE; + case FEDFS_ERR_SVRFAULT: + xlog(L_ERROR, "No memory"); + return EXIT_FAILURE; + default: + xlog(L_ERROR, "Failed to add NFS location metadata to %s: %s", + junct_path, nsdb_display_fedfsstatus(retval)); + return EXIT_FAILURE; + } + + retval = nfs_add_junction(junct_path, fslocs); + nfs_free_locations(fslocs); + switch (retval) { + case FEDFS_OK: + break; + case FEDFS_ERR_EXIST: + xlog(L_ERROR, "%s already contains junction metadata", + junct_path); + return EXIT_FAILURE; + default: + xlog(L_ERROR, "Failed to add NFS location metadata to %s: %s", + junct_path, nsdb_display_fedfsstatus(retval)); + return EXIT_FAILURE; + } + + printf("Created junction %s\n", junct_path); + return EXIT_SUCCESS; +} + +/** + * Add locations to a junction + * + * @param type type of junction to add + * @param junct_path NUL-terminated C string containing pathname of junction + * @param argv array of pointers to NUL-terminated C strings contains arguments + * @param optind index of "argv" where "add" subcommand arguments start + * @return program exit status + */ +int +nfsref_add(enum nfsref_type type, const char *junct_path, char **argv, int optind) +{ + if (mkdir(junct_path, 0755) == -1) + if (errno != EEXIST) { + xlog(L_ERROR, "Failed to create junction object: %m"); + return EXIT_FAILURE; + } + + switch (type) { + case NFSREF_TYPE_UNSPECIFIED: + case NFSREF_TYPE_NFS_BASIC: + return nfsref_add_nfs_basic(junct_path, argv, optind); + default: + xlog(L_ERROR, "Unrecognized junction type"); + } + return EXIT_FAILURE; +} diff --git a/utils/nfsref/lookup.c b/utils/nfsref/lookup.c new file mode 100644 index 0000000..16fca2e --- /dev/null +++ b/utils/nfsref/lookup.c @@ -0,0 +1,211 @@ +/** + * @file utils/nfsref/lookup.c + * @brief Examine junction metadata from a local file system object + */ + +/* + * Copyright 2011, 2018 Oracle. All rights reserved. + * + * This file is part of nfs-utils. + * + * nfs-utils is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2.0 as + * published by the Free Software Foundation. + * + * nfs-utils is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2.0 for more details. + * + * You should have received a copy of the GNU General Public License + * version 2.0 along with nfs-utils. If not, see: + * + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt + */ + +#include <stdint.h> +#include <stdbool.h> +#include <stdlib.h> +#include <stdio.h> + +#include <rpcsvc/nfs_prot.h> + +#include "junction.h" +#include "xlog.h" +#include "nfsref.h" + +/** + * Display help message for "lookup" subcommand + * + * @param progname NUL-terminated C string containing name of program + * @return program exit status + */ +int +nfsref_lookup_help(const char *progname) +{ + fprintf(stderr, " \n"); + + fprintf(stderr, "Usage: %s [ -t type ] lookup <junction path>\n\n", + progname); + + fprintf(stderr, "Display the contents of the junction at " + "<junction path>. For NFS basic\n"); + fprintf(stderr, "junctions, the local contents of the junction " + "are displayed. For FedFS\n"); + fprintf(stderr, "junctions, FSL records are retrieved from the " + "NSDB and displayed.\n"); + + return EXIT_SUCCESS; +} + +/** + * Convert a boolean value into a displayable string constant + * + * @param value boolean value + * @return NUL-terminated static constant C string + */ +static const char * +nfsref_lookup_display_boolean(_Bool value) +{ + return value ? "true" : "false"; +} + +/** + * Display a single NFS location + * + * @param fsloc pointer to an NFS location structure + */ +static void +nfsref_lookup_display_nfs_location(struct nfs_fsloc *fsloc) +{ + char *rootpath; + + if (nsdb_path_array_to_posix(fsloc->nfl_rootpath, &rootpath) == FEDFS_OK) { + printf("%s:%s\n", fsloc->nfl_hostname, rootpath); + free(rootpath); + } else + printf("%s: - Invalid root path -\n", fsloc->nfl_hostname); + printf("\n"); + + printf("\tNFS port:\t%u\n", fsloc->nfl_hostport); + printf("\tValid for:\t%d\n", fsloc->nfl_validfor); + printf("\tCurrency:\t%d\n", fsloc->nfl_currency); + printf("\tFlags:\t\tvarsub(%s)\n", + nfsref_lookup_display_boolean(fsloc->nfl_flags.nfl_varsub)); + + printf("\tGenFlags:\twritable(%s), going(%s), split(%s)\n", + nfsref_lookup_display_boolean(fsloc->nfl_genflags.nfl_writable), + nfsref_lookup_display_boolean(fsloc->nfl_genflags.nfl_going), + nfsref_lookup_display_boolean(fsloc->nfl_genflags.nfl_split)); + printf("\tTransFlags:\trdma(%s)\n", + nfsref_lookup_display_boolean(fsloc->nfl_transflags.nfl_rdma)); + + printf("\tClass:\t\tsimul(%u), handle(%u), fileid(%u)\n", + fsloc->nfl_info.nfl_simul, + fsloc->nfl_info.nfl_handle, + fsloc->nfl_info.nfl_fileid); + printf("\tClass:\t\twritever(%u), change(%u), readdir(%u)\n", + fsloc->nfl_info.nfl_writever, + fsloc->nfl_info.nfl_change, + fsloc->nfl_info.nfl_readdir); + printf("\tRead:\t\trank(%u), order(%u)\n", + fsloc->nfl_info.nfl_readrank, fsloc->nfl_info.nfl_readorder); + printf("\tWrite:\t\trank(%u), order(%u)\n", + fsloc->nfl_info.nfl_writerank, fsloc->nfl_info.nfl_writeorder); + + printf("\n"); +} + +/** + * Display a list of NFS locations + * + * @param fslocs list of NFS locations to display + */ +static void +nfsref_lookup_display_nfs_locations(struct nfs_fsloc *fslocs) +{ + struct nfs_fsloc *fsloc; + + for (fsloc = fslocs; fsloc != NULL; fsloc = fsloc->nfl_next) + nfsref_lookup_display_nfs_location(fsloc); +} + +/** + * List NFS locations in an nfs-basic junction + * + * @param junct_path NUL-terminated C string containing pathname of junction + * @return program exit status + */ +static int +nfsref_lookup_nfs_basic(const char *junct_path) +{ + struct nfs_fsloc *fslocs = NULL; + FedFsStatus retval; + + xlog(D_GENERAL, "%s: Looking up basic junction in %s", + __func__, junct_path); + + retval = nfs_is_junction(junct_path); + switch (retval) { + case FEDFS_OK: + break; + case FEDFS_ERR_NOTJUNCT: + xlog(L_ERROR, "%s is not an nfs-basic junction", junct_path); + return EXIT_FAILURE; + default: + xlog(L_ERROR, "Failed to access %s: %s", + junct_path, nsdb_display_fedfsstatus(retval)); + return EXIT_FAILURE; + } + + retval = nfs_get_locations(junct_path, &fslocs); + if (retval != FEDFS_OK) { + xlog(L_ERROR, "Failed to access %s: %s", + junct_path, nsdb_display_fedfsstatus(retval)); + return EXIT_FAILURE; + } + + nfsref_lookup_display_nfs_locations(fslocs); + + nfs_free_locations(fslocs); + return EXIT_SUCCESS; +} + +/** + * Resolve either a FedFS or NFS basic junction + * + * @param junct_path NUL-terminated C string containing pathname of junction + * @return program exit status + */ +static int +nfsref_lookup_unspecified(const char *junct_path) +{ + FedFsStatus retval; + + retval = nfs_is_junction(junct_path); + if (retval == FEDFS_OK) + return nfsref_lookup_nfs_basic(junct_path); + xlog(L_ERROR, "%s is not a junction", junct_path); + return EXIT_FAILURE; +} + +/** + * Enumerate metadata of a junction + * + * @param type type of junction to add + * @param junct_path NUL-terminated C string containing pathname of junction + * @return program exit status + */ +int +nfsref_lookup(enum nfsref_type type, const char *junct_path) +{ + switch (type) { + case NFSREF_TYPE_UNSPECIFIED: + return nfsref_lookup_unspecified(junct_path); + case NFSREF_TYPE_NFS_BASIC: + return nfsref_lookup_nfs_basic(junct_path); + default: + xlog(L_ERROR, "Unrecognized junction type"); + } + return EXIT_FAILURE; +} diff --git a/utils/nfsref/nfsref.c b/utils/nfsref/nfsref.c new file mode 100644 index 0000000..ff7013e --- /dev/null +++ b/utils/nfsref/nfsref.c @@ -0,0 +1,188 @@ +/** + * @file utils/nfsref/nfsref.c + * @brief Manage NFS referrals + */ + +/* + * Copyright 2011, 2018 Oracle. All rights reserved. + * + * This file is part of nfs-utils. + * + * nfs-utils is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2.0 as + * published by the Free Software Foundation. + * + * nfs-utils is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2.0 for more details. + * + * You should have received a copy of the GNU General Public License + * version 2.0 along with nfs-utils. If not, see: + * + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt + */ + +#include <sys/types.h> +#include <sys/capability.h> +#include <sys/prctl.h> +#include <sys/stat.h> + +#include <stdbool.h> +#include <stdint.h> +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> +#include <getopt.h> +#include <time.h> + +#include <locale.h> +#include <langinfo.h> + +#include "junction.h" +#include "xlog.h" +#include "nfsref.h" + +/** + * Short form command line options + */ +static const char nfsref_opts[] = "?dt:"; + +/** + * Long form command line options + */ +static const struct option nfsref_longopts[] = { + { "debug", 0, NULL, 'd', }, + { "help", 0, NULL, '?', }, + { "type", 1, NULL, 't', }, + { NULL, 0, NULL, 0, }, +}; + +/** + * Display program synopsis + * + * @param progname NUL-terminated C string containing name of program + */ +static void +nfsref_usage(const char *progname) +{ + fprintf(stderr, "Usage: %s [ -t type ] SUBCOMMAND [ ARGUMENTS ]\n\n", + progname); + + fprintf(stderr, "SUBCOMMAND is one of:\n"); + fprintf(stderr, "\tadd Add a new junction\n"); + fprintf(stderr, "\tremove Remove an existing junction\n"); + fprintf(stderr, "\tlookup Enumerate a junction\n"); + + fprintf(stderr, "\nUse \"%s SUBCOMMAND -?\" for details.\n", progname); +} + +/** + * Program entry point + * + * @param argc count of command line arguments + * @param argv array of NUL-terminated C strings containing command line arguments + * @return program exit status + */ +int +main(int argc, char **argv) +{ + char *progname, *subcommand, *junct_path; + enum nfsref_type type; + int arg, exit_status; + _Bool help; + + (void)setlocale(LC_ALL, ""); + (void)umask(S_IWGRP | S_IWOTH); + + exit_status = EXIT_FAILURE; + + /* Set the basename */ + if ((progname = strrchr(argv[0], '/')) != NULL) + progname++; + else + progname = argv[0]; + + xlog_stderr(1); + xlog_syslog(0); + xlog_open(progname); + + if (argc < 2) { + nfsref_usage(progname); + goto out; + } + + help = false; + type = NFSREF_TYPE_UNSPECIFIED; + while ((arg = getopt_long(argc, argv, nfsref_opts, + nfsref_longopts, NULL)) != -1) { + switch (arg) { + case 'd': + xlog_config(D_ALL, 1); + break; + case 't': + if (strcmp(optarg, "nfs-basic") == 0) + type = NFSREF_TYPE_NFS_BASIC; + else if (strcmp(optarg, "nfs-fedfs") == 0) + type = NFSREF_TYPE_NFS_FEDFS; + else { + xlog(L_ERROR, + "Unrecognized junction type: %s", + optarg); + exit(EXIT_FAILURE); + } + break; + case '?': + help = true; + } + } + + if (argc < optind + 1) { + nfsref_usage(progname); + goto out; + } + + if (!help && geteuid() != 0) { + xlog(L_ERROR, "Root permission is required"); + goto out; + } + + subcommand = argv[optind]; + junct_path = argv[optind + 1]; + + if (strcasecmp(subcommand, "add") == 0) { + if (help) { + exit_status = nfsref_add_help(progname); + goto out; + } + if (argc < optind + 3) { + xlog(L_ERROR, "Not enough positional parameters"); + nfsref_usage(progname); + goto out; + } + exit_status = nfsref_add(type, junct_path, argv, optind); + if (exit_status == EXIT_SUCCESS) + (void)junction_flush_exports_cache(); + } else if (strcasecmp(subcommand, "remove") == 0) { + if (help) { + exit_status = nfsref_remove_help(progname); + goto out; + } + exit_status = nfsref_remove(type, junct_path); + if (exit_status == EXIT_SUCCESS) + (void)junction_flush_exports_cache(); + } else if (strcasecmp(subcommand, "lookup") == 0) { + if (help) { + exit_status = nfsref_lookup_help(progname); + goto out; + } + exit_status = nfsref_lookup(type, junct_path); + } else { + xlog(L_ERROR, "Unrecognized subcommand: %s", subcommand); + nfsref_usage(progname); + } + +out: + exit(exit_status); +} diff --git a/utils/nfsref/nfsref.h b/utils/nfsref/nfsref.h new file mode 100644 index 0000000..e9dd9ae --- /dev/null +++ b/utils/nfsref/nfsref.h @@ -0,0 +1,47 @@ +/** + * @file src/nfsref/nfsref.h + * @brief Declarations and definitions for nfsref command line tool + */ + +/* + * Copyright 2011 Oracle. All rights reserved. + * + * This file is part of fedfs-utils. + * + * fedfs-utils is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2.0 as + * published by the Free Software Foundation. + * + * fedfs-utils is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2.0 for more details. + * + * You should have received a copy of the GNU General Public License + * version 2.0 along with fedfs-utils. If not, see: + * + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt + */ + +#ifndef FEDFS_NFSREF_H +#define FEDFS_NFSREF_H + +/** + * Junction types supported by the "nfsref" command + */ +enum nfsref_type { + NFSREF_TYPE_UNSPECIFIED = 1, + NFSREF_TYPE_NFS_BASIC, + NFSREF_TYPE_NFS_FEDFS +}; + +int nfsref_add(enum nfsref_type type, const char *junct_path, char **argv, + int optind); +int nfsref_remove(enum nfsref_type type, const char *junct_path); +int nfsref_lookup(enum nfsref_type type, const char *junct_path); + +int nfsref_add_help(const char *progname); +int nfsref_remove_help(const char *progname); +int nfsref_lookup_help(const char *progname); + +#endif /* !FEDFS_NFSREF_H */ diff --git a/utils/nfsref/nfsref.man b/utils/nfsref/nfsref.man new file mode 100644 index 0000000..1261549 --- /dev/null +++ b/utils/nfsref/nfsref.man @@ -0,0 +1,180 @@ +.\"@(#)nfsref.8" +.\" +.\" @file utils/nfsref/nfsref.man +.\" @brief man page for nfsref command +.\" + +.\" +.\" Copyright 2011, 2018 Oracle. All rights reserved. +.\" +.\" This file is part of nfs-utils. +.\" +.\" nfs-utils is free software; you can redistribute it and/or modify +.\" it under the terms of the GNU General Public License version 2.0 as +.\" published by the Free Software Foundation. +.\" +.\" nfs-utils is distributed in the hope that it will be useful, but +.\" WITHOUT ANY WARRANTY; without even the implied warranty of +.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +.\" GNU General Public License version 2.0 for more details. +.\" +.\" You should have received a copy of the GNU General Public License +.\" version 2.0 along with nfs-utils. If not, see: +.\" +.\" http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt +.\" +.TH NFSREF 8 "9 Jan 2018" +.SH NAME +nfsref \- manage NFS referrals +.SH SYNOPSIS +.B nfsref +.RB [ \-?d ] +.RB [ \-t +.IB type ] +.B add +.I pathname server export +.RI [ " server" +.IR export " ... ]" +.P +.B nfsref +.RB [ \-?d ] +.RB [ \-t +.IB type ] +.B remove +.I pathname +.P +.B nfsref +.RB [ \-?d ] +.RB [ \-t +.IB type ] +.B lookup +.I pathname +.SH INTRODUCTION +NFS version 4 introduces the concept of +.I file system referrals +to NFS. +A file system referral is like a symbolic link on a file server +to another file system share, possibly on another file server. +On an NFS client, a referral behaves like an automounted directory. +The client, under the server's direction, mounts a new NFS export +automatically when an application first accesses that directory. +.P +Referrals are typically used to construct a single file name space +across multiple file servers. +Because file servers control the shape of the name space, +no client configuration is required, +and all clients see the same referral information. +.P +The Linux NFS server supports NFS version 4 referrals. +Administrators can specify the +.B refer= +export option in +.I /etc/exports +to configure a list of exports from which the client can choose. +See +.BR exports (5) +for details. +.P +.SH DESCRIPTION +The +.BR nfsref (8) +command is a simple way to get started managing junction metadata. +Other administrative commands provide richer access to junction information. +.SS Subcommands +Valid +.BR nfsref (8) +subcommands are: +.IP "\fBadd\fP" +Adds junction information to the directory named by +.IR pathname . +The named directory must already exist, +and must not already contain junction information. +Regular directory contents are obscured to NFS clients by this operation. +.IP +A list of one or more file server and export path pairs +is also specified on the command line. +When creating an NFS basic junction, this list is +stored in an extended attribute of the directory. +.IP +If junction creation is successful, the +.BR nfsref (8) +command flushes the kernel's export cache +to remove previously cached junction information. +.IP "\fBremove\fP" +Removes junction information from the directory named by +.IR pathname . +The named directory must exist, +and must contain junction information. +Regular directory contents are made visible to NFS clients again by this operation. +.IP +If junction deletion is successful, the +.BR nfsref (8) +command flushes the kernel's export cache +to remove previously cached junction information. +.IP "\fBlookup\fP" +Displays junction information stored in the directory named by +.IR pathname . +The named directory must exist, +and must contain junction information. +.IP +When looking up an NFS basic junction, the junction information +in the directory is listed on +.IR stdout . +.SS Command line options +.IP "\fB\-d, \-\-debug" +Enables debugging messages during operation. +.IP "\fB\-t, \-\-type=\fIjunction-type\fP" +Specifies the junction type for the operation. Valid values for +.I junction-type +are +.B nfs-basic +or +.BR nfs-fedfs . +.IP +For the +.B add +subcommand, the default value if this option is not specified is +.BR nfs-basic . +For the +.B remove +and +.B lookup +subcommands, the +.B \-\-type +option is not required. The +.BR nfsref (8) +command operates on whatever junction contents are available. +.SH EXAMPLES +Suppose you have two file servers, +.I top.example.net +and +.IR home.example.net . +You want all your clients to mount +.I top.example.net:/ +and then see the files under +.I home.example.net:/ +automatically in +.IR top:/home . +.P +On +.IR top.example.net , +you might issue this command as root: +.RS +.sp +# mkdir /home +.br +# nfsref --type=nfs-basic add /home home.example.net / +.br +Created junction /home. +.sp +.RE +.SH FILES +.TP +.I /etc/exports +NFS server export table +.SH "SEE ALSO" +.BR exports (5) +.sp +RFC 5661 for a description of NFS version 4 referrals +.SH "AUTHOR" +Chuck Lever <chuck.lever@xxxxxxxxxx> diff --git a/utils/nfsref/remove.c b/utils/nfsref/remove.c new file mode 100644 index 0000000..1a4e371 --- /dev/null +++ b/utils/nfsref/remove.c @@ -0,0 +1,145 @@ +/** + * @file utils/nfsref/remove.c + * @brief Remove junction metadata from a local file system object + */ + +/* + * Copyright 2011, 2018 Oracle. All rights reserved. + * + * This file is part of nfs-utils. + * + * nfs-utils is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2.0 as + * published by the Free Software Foundation. + * + * nfs-utils is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2.0 for more details. + * + * You should have received a copy of the GNU General Public License + * version 2.0 along with nfs-utils. If not, see: + * + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt + */ + +#include <stdbool.h> +#include <stdint.h> +#include <stdlib.h> +#include <stdio.h> + +#include <unistd.h> +#include <errno.h> + +#include "junction.h" +#include "xlog.h" +#include "nfsref.h" + +/** + * Display help message for "remove" subcommand + * + * @param progname NUL-terminated C string containing name of program + * @return program exit status + */ +int +nfsref_remove_help(const char *progname) +{ + fprintf(stderr, " \n"); + + fprintf(stderr, "Usage: %s [ -t type ] remove <junction path>\n\n", + progname); + + fprintf(stderr, "Remove the junction at <junction path>. For FedFS " + "junctions, FSL and FSN\n"); + fprintf(stderr, "records are removed from the NSDB.\n"); + + return EXIT_SUCCESS; +} + +/** + * Remove an NFS locations-style junction + * + * @param junct_path NUL-terminated C string containing pathname of junction + * @return program exit status + */ +static int +nfsref_remove_nfs_basic(const char *junct_path) +{ + int status = EXIT_FAILURE; + FedFsStatus retval; + + xlog(D_GENERAL, "%s: Removing FedFS junction from %s", + __func__, junct_path); + + retval = nfs_delete_junction(junct_path); + switch (retval) { + case FEDFS_OK: + printf("Removed nfs-basic junction from %s\n", junct_path); + status = EXIT_SUCCESS; + break; + case FEDFS_ERR_NOTJUNCT: + xlog(L_ERROR, "%s is not an nfs-basic junction", junct_path); + break; + default: + xlog(L_ERROR, "Failed to delete %s: %s", + junct_path, nsdb_display_fedfsstatus(retval)); + } + + return status; +} + +/** + * Remove any NFS junction information + * + * @param junct_path NUL-terminated C string containing pathname of junction + * @return program exit status + */ +static int +nfsref_remove_unspecified(const char *junct_path) +{ + FedFsStatus retval; + + xlog(D_GENERAL, "%s: Removing junction from %s", + __func__, junct_path); + + retval = nfs_delete_junction(junct_path); + if (retval != FEDFS_OK) { + if (retval != FEDFS_ERR_NOTJUNCT) + goto out_err; + } + + printf("Removed junction from %s\n", junct_path); + return EXIT_SUCCESS; + +out_err: + switch (retval) { + case FEDFS_ERR_NOTJUNCT: + xlog(L_ERROR, "No junction information found in %s", junct_path); + break; + default: + xlog(L_ERROR, "Failed to delete %s: %s", + junct_path, nsdb_display_fedfsstatus(retval)); + } + return EXIT_FAILURE; +} + +/** + * Remove an NFS junction + * + * @param type type of junction to add + * @param junct_path NUL-terminated C string containing pathname of junction + * @return program exit status + */ +int +nfsref_remove(enum nfsref_type type, const char *junct_path) +{ + switch (type) { + case NFSREF_TYPE_UNSPECIFIED: + return nfsref_remove_unspecified(junct_path); + case NFSREF_TYPE_NFS_BASIC: + return nfsref_remove_nfs_basic(junct_path); + default: + xlog(L_ERROR, "Unrecognized junction type"); + } + return EXIT_FAILURE; +} -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
