lustre/utils/lfs_project.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2017, DataDirect Networks Storage.
  24  * Copyright (c) 2017, Intel Corporation.
  25  */
  26 /*
  27  * This file is part of Lustre, http://www.lustre.org/
  28  *
  29  * lustre/utils/lfs_project.c
  30  *
  31  * Author: Wang Shilong <wshilong@ddn.com>
  32  * Author: Fan Yong <fan.yong@intel.com>
  33  */
  34 #include <errno.h>
  35 #include <getopt.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <strings.h>
  39 #include <unistd.h>
  40 #include <fcntl.h>
  41 #include <dirent.h>
  42 #include <stddef.h>
  43 #include <libintl.h>
  44 #include <sys/stat.h>
  45 #include <sys/types.h>
  46 #include <string.h>
  47 #include <libcfs/util/list.h>
  48 #include <libcfs/util/ioctl.h>
  49 #include <sys/ioctl.h>
  50
  51 #include "lfs_project.h"
  52 #include <lustre/lustreapi.h>
  53
  54 struct lfs_project_item {
  55         struct list_head lpi_list;
  56         char lpi_pathname[PATH_MAX];
  57 };
  58
  59 static int
  60 lfs_project_item_alloc(struct list_head *head, const char *pathname)
  61 {
  62         struct lfs_project_item *lpi;
  63
  64         lpi = malloc(sizeof(struct lfs_project_item));
  65         if (lpi == NULL) {
  66                 fprintf(stderr,
  67                         "%s: cannot allocate project item for '%s': %s\n",
  68                         progname, pathname, strerror(ENOMEM));
  69                 return -ENOMEM;
  70         }
  71
  72         strncpy(lpi->lpi_pathname, pathname, sizeof(lpi->lpi_pathname) - 1);
  73         list_add_tail(&lpi->lpi_list, head);
  74
  75         return 0;
  76 }
  77
  78 static const char *mode_to_type(mode_t mode)
  79 {
  80         switch (mode & S_IFMT) {
  81         case S_IFDIR:   return "dir";
  82         case S_IFREG:   return "regular";
  83         case S_IFLNK:   return "symlink";
  84         case S_IFCHR:   return "char device";
  85         case S_IFBLK:   return "block device";
  86         case S_IFIFO:   return "fifo";
  87         case S_IFSOCK:  return "sock";
  88         }
  89
  90         return "unknown";
  91 }
  92
  93 static int project_get_xattr(const char *pathname, struct fsxattr *fsx,
  94                              struct stat *st)
  95 {
  96         int ret, fd;
  97
  98         ret = lstat(pathname, st);
  99         if (ret) {
 100                 fprintf(stderr, "%s: failed to stat '%s': %s\n",
 101                         progname, pathname, strerror(errno));
 102                 return -errno;
 103         }
 104
 105         /* currently, only file and dir supported */
 106         if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode)) {
 107                 errno = ENOTSUP;
 108                 fprintf(stderr, "%s: unable to get xattr for %s '%s': %s\n",
 109                                 progname, mode_to_type(st->st_mode), pathname,
 110                                 strerror(errno));
 111                 return -errno;
 112         }
 113
 114         fd = open(pathname, O_RDONLY | O_NOCTTY | O_NDELAY);
 115         if (fd < 0) {
 116                 fprintf(stderr, "%s: failed to open '%s': %s\n",
 117                         progname, pathname, strerror(errno));
 118                 return -errno;
 119         }
 120
 121         ret = ioctl(fd, LL_IOC_FSGETXATTR, fsx);
 122         if (ret) {
 123                 fprintf(stderr, "%s: failed to get xattr for '%s': %s\n",
 124                         progname, pathname, strerror(errno));
 125                 return -errno;
 126         }
 127         return fd;
 128 }
 129
 130 static int
 131 project_check_one(const char *pathname, struct project_handle_control *phc)
 132 {
 133         struct fsxattr fsx;
 134         int ret;
 135         struct stat st;
 136
 137         ret = project_get_xattr(pathname, &fsx, &st);
 138         if (ret < 0)
 139                 return ret;
 140
 141         /* use top directory's project ID if not specified */
 142         if (!phc->assign_projid) {
 143                 phc->assign_projid = true;
 144                 phc->projid = fsx.fsx_projid;
 145         }
 146
 147         if (!(fsx.fsx_xflags & FS_XFLAG_PROJINHERIT) &&
 148             S_ISDIR(st.st_mode)) {
 149                 if (!phc->newline) {
 150                         printf("%s%c", pathname, '\0');
 151                         goto out;
 152                 }
 153                  printf("%s - project inheritance flag is not set\n",
 154                         pathname);
 155         }
 156
 157         if (fsx.fsx_projid != phc->projid) {
 158                 if (!phc->newline) {
 159                         printf("%s%c", pathname, '\0');
 160                         goto out;
 161                 }
 162                 printf("%s - project identifier is not set (inode=%u, tree=%u)\n",
 163                        pathname, fsx.fsx_projid, phc->projid);
 164         }
 165 out:
 166         close(ret);
 167         return 0;
 168 }
 169
 170 static int
 171 project_list_one(const char *pathname, struct project_handle_control *phc)
 172 {
 173         struct fsxattr fsx;
 174         struct stat st;
 175         int ret;
 176
 177         ret = project_get_xattr(pathname, &fsx, &st);
 178         if (ret < 0)
 179                 return ret;
 180
 181         printf("%5u %c %s\n", fsx.fsx_projid,
 182                (fsx.fsx_xflags & FS_XFLAG_PROJINHERIT) ?
 183                 'P' : '-', pathname);
 184
 185         close(ret);
 186         return 0;
 187 }
 188
 189 static int
 190 project_set_one(const char *pathname, struct project_handle_control *phc)
 191 {
 192         struct fsxattr fsx;
 193         struct stat st;
 194         int fd, ret = 0;
 195
 196         fd = project_get_xattr(pathname, &fsx, &st);
 197         if (fd < 0)
 198                 return fd;
 199
 200         if ((!phc->set_projid || fsx.fsx_projid == phc->projid) &&
 201             (!phc->set_inherit || (fsx.fsx_xflags & FS_XFLAG_PROJINHERIT)))
 202                 goto out;
 203
 204         if (phc->set_inherit)
 205                 fsx.fsx_xflags |= FS_XFLAG_PROJINHERIT;
 206         if (phc->set_projid)
 207                 fsx.fsx_projid = phc->projid;
 208
 209         ret = ioctl(fd, LL_IOC_FSSETXATTR, &fsx);
 210         if (ret)
 211                 fprintf(stderr, "%s: failed to set xattr for '%s': %s\n",
 212                         progname, pathname, strerror(errno));
 213 out:
 214         close(fd);
 215         return ret;
 216 }
 217
 218 static int
 219 project_clear_one(const char *pathname, struct project_handle_control *phc)
 220 {
 221         struct fsxattr fsx;
 222         struct stat st;
 223         int ret = 0, fd;
 224
 225         fd = project_get_xattr(pathname, &fsx, &st);
 226         if (fd < 0)
 227                 return fd;
 228
 229         if ((!(fsx.fsx_xflags & FS_XFLAG_PROJINHERIT)) &&
 230              (fsx.fsx_projid == 0 || phc->keep_projid))
 231                 goto out;
 232
 233         fsx.fsx_xflags &= ~FS_XFLAG_PROJINHERIT;
 234         if (!phc->keep_projid)
 235                 fsx.fsx_projid = 0;
 236
 237         ret = ioctl(fd, LL_IOC_FSSETXATTR, &fsx);
 238         if (ret)
 239                 fprintf(stderr, "%s: failed to set xattr for '%s': %s\n",
 240                         progname, pathname, strerror(errno));
 241 out:
 242         close(fd);
 243         return ret;
 244 }
 245
 246 static int
 247 lfs_project_handle_dir(struct list_head *head, const char *pathname,
 248                        struct project_handle_control *phc,
 249                        int (*func)(const char *,
 250                                    struct project_handle_control *))
 251 {
 252         char fullname[PATH_MAX];
 253         struct dirent *ent;
 254         DIR *dir;
 255         int ret = 0;
 256         int rc;
 257
 258         dir = opendir(pathname);
 259         if (dir == NULL) {
 260                 ret = -errno;
 261                 fprintf(stderr, "%s: failed to opendir '%s': %s\n",
 262                         progname, pathname, strerror(-ret));
 263                 return ret;
 264         }
 265
 266         while ((ent = readdir(dir)) != NULL) {
 267                 /* skip "." and ".." */
 268                 if (strcmp(ent->d_name, ".") == 0 ||
 269                     strcmp(ent->d_name, "..") == 0)
 270                         continue;
 271
 272                 if (strlen(ent->d_name) + strlen(pathname) + 1 >=
 273                     sizeof(fullname)) {
 274                         ret = -ENAMETOOLONG;
 275                         errno = ENAMETOOLONG;
 276                         fprintf(stderr, "%s: ignored too long path: %s/%s\n",
 277                                         progname, pathname, ent->d_name);
 278                         continue;
 279                 }
 280                 snprintf(fullname, PATH_MAX, "%s/%s", pathname,
 281                          ent->d_name);
 282
 283                 rc = func(fullname, phc);
 284                 if (rc && !ret)
 285                         ret = rc;
 286                 if (phc->recursive && ent->d_type == DT_DIR) {
 287                         rc = lfs_project_item_alloc(head, fullname);
 288                         if (rc && !ret)
 289                                 ret = rc;
 290                 }
 291         }
 292
 293         closedir(dir);
 294         return ret;
 295 }
 296
 297 static int lfs_project_iterate(const char *pathname,
 298                                struct project_handle_control *phc,
 299                                int (*func)(const char *,
 300                                            struct project_handle_control *))
 301 {
 302         struct lfs_project_item *lpi;
 303         struct list_head head;
 304         struct stat st;
 305         int ret = 0;
 306         int rc = 0;
 307
 308         ret = stat(pathname, &st);
 309         if (ret) {
 310                 fprintf(stderr, "%s: failed to stat '%s': %s\n",
 311                         progname, pathname, strerror(errno));
 312                 return ret;
 313         }
 314
 315         /* list opeation will skip top directory in default */
 316         if (!S_ISDIR(st.st_mode) || phc->dironly ||
 317             project_list_one != func)
 318                 ret = func(pathname, phc);
 319
 320         /* dironly first, recursive will be ignored */
 321         if (!S_ISDIR(st.st_mode) || phc->dironly || ret)
 322                 return ret;
 323
 324         INIT_LIST_HEAD(&head);
 325         ret = lfs_project_item_alloc(&head, pathname);
 326         if (ret)
 327                 return ret;
 328
 329         while (!list_empty(&head)) {
 330                 lpi = list_entry(head.next, struct lfs_project_item, lpi_list);
 331                 list_del(&lpi->lpi_list);
 332                 rc = lfs_project_handle_dir(&head, lpi->lpi_pathname,
 333                                              phc, func);
 334                 if (!ret && rc)
 335                         ret = rc;
 336                 free(lpi);
 337         }
 338
 339         return ret;
 340 }
 341
 342
 343 inline int lfs_project_check(const char *pathname,
 344                              struct project_handle_control *phc)
 345 {
 346         return lfs_project_iterate(pathname, phc, project_check_one);
 347 }
 348
 349 inline int lfs_project_clear(const char *pathname,
 350                              struct project_handle_control *phc)
 351 {
 352         return lfs_project_iterate(pathname, phc, project_clear_one);
 353 }
 354
 355 inline int lfs_project_set(const char *pathname,
 356                            struct project_handle_control *phc)
 357 {
 358         return lfs_project_iterate(pathname, phc, project_set_one);
 359 }
 360
 361 inline int lfs_project_list(const char *pathname,
 362                             struct project_handle_control *phc)
 363 {
 364         return lfs_project_iterate(pathname, phc, project_list_one);
 365 }