libfrog/linux.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 #include <mntent.h>
   8 #include <sys/stat.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/sysinfo.h>
  11
  12 #include "libxfs_priv.h"
  13 #include "xfs_fs.h"
  14 #include "init.h"
  15
  16 extern char *progname;
  17 static int max_block_alignment;
  18
  19 #ifndef BLKGETSIZE64
  20 # define BLKGETSIZE64   _IOR(0x12,114,size_t)
  21 #endif
  22 #ifndef BLKBSZSET
  23 # define BLKBSZSET      _IOW(0x12,113,size_t)
  24 #endif
  25 #ifndef BLKSSZGET
  26 # define BLKSSZGET      _IO(0x12,104)
  27 #endif
  28
  29 #ifndef RAMDISK_MAJOR
  30 #define RAMDISK_MAJOR   1       /* ramdisk major number */
  31 #endif
  32
  33 #define PROC_MOUNTED    "/proc/mounts"
  34
  35 /*
  36  * Check if the filesystem is mounted.  Be verbose if asked, and
  37  * optionally restrict check to /writable/ mounts (i.e. RO is OK)
  38  */
  39 #define CHECK_MOUNT_VERBOSE     0x1
  40 #define CHECK_MOUNT_WRITABLE    0x2
  41
  42 static int
  43 platform_check_mount(char *name, char *block, struct stat *s, int flags)
  44 {
  45         FILE            *f;
  46         struct stat     st, mst;
  47         struct mntent   *mnt;
  48         char            mounts[MAXPATHLEN];
  49
  50         if (!s) {
  51                 /* If either fails we are not mounted */
  52                 if (stat(block, &st) < 0)
  53                         return 0;
  54                 if ((st.st_mode & S_IFMT) != S_IFBLK)
  55                         return 0;
  56                 s = &st;
  57         }
  58
  59         strcpy(mounts, (!access(PROC_MOUNTED, R_OK)) ? PROC_MOUNTED : MOUNTED);
  60         if ((f = setmntent(mounts, "r")) == NULL) {
  61                 /* Unexpected failure, warn unconditionally */
  62                 fprintf(stderr,
  63                     _("%s: %s possibly contains a mounted filesystem\n"),
  64                     progname, name);
  65                 return 1;
  66         }
  67         /*
  68          * This whole business is to work out if our block device is mounted
  69          * after we lost ustat(2), see:
  70          *      4e7a824 libxfs/linux.c: Replace use of ustat by stat
  71          * We don't really want to stat every single mounted directory,
  72          * as that may include tmpfs, cgroups, procfs or - worst - hung nfs
  73          * servers.  So first, a simple check: does the "dev" start with "/" ?
  74          */
  75         while ((mnt = getmntent(f)) != NULL) {
  76                 if (mnt->mnt_fsname[0] != '/')
  77                         continue;
  78                 if (stat(mnt->mnt_dir, &mst) < 0)
  79                         continue;
  80                 if (mst.st_dev != s->st_rdev)
  81                         continue;
  82                 /* Found our device, is RO OK? */
  83                 if ((flags & CHECK_MOUNT_WRITABLE) && hasmntopt(mnt, MNTOPT_RO))
  84                         continue;
  85                 else
  86                         break;
  87         }
  88         endmntent(f);
  89
  90         /* No mounts contained the condition we were looking for */
  91         if (mnt == NULL)
  92                 return 0;
  93
  94         if (flags & CHECK_MOUNT_VERBOSE) {
  95                 if (flags & CHECK_MOUNT_WRITABLE) {
  96                         fprintf(stderr,
  97 _("%s: %s contains a mounted and writable filesystem\n"),
  98                                 progname, name);
  99                 } else {
 100                         fprintf(stderr,
 101 _("%s: %s contains a mounted filesystem\n"),
 102                                 progname, name);
 103                 }
 104         }
 105         return 1;
 106 }
 107
 108 int
 109 platform_check_ismounted(char *name, char *block, struct stat *s, int verbose)
 110 {
 111         int flags;
 112
 113         flags = verbose ? CHECK_MOUNT_VERBOSE : 0;
 114         return platform_check_mount(name, block, s, flags);
 115 }
 116
 117 int
 118 platform_check_iswritable(char *name, char *block, struct stat *s)
 119 {
 120         int flags;
 121
 122         /* Writable checks are always verbose */
 123         flags = CHECK_MOUNT_WRITABLE | CHECK_MOUNT_VERBOSE;
 124         return platform_check_mount(name, block, s, flags);
 125 }
 126
 127 int
 128 platform_set_blocksize(int fd, char *path, dev_t device, int blocksize, int fatal)
 129 {
 130         int error = 0;
 131
 132         if (major(device) != RAMDISK_MAJOR) {
 133                 if ((error = ioctl(fd, BLKBSZSET, &blocksize)) < 0) {
 134                         fprintf(stderr, _("%s: %s - cannot set blocksize "
 135                                         "%d on block device %s: %s\n"),
 136                                 progname, fatal ? "error": "warning",
 137                                 blocksize, path, strerror(errno));
 138                 }
 139         }
 140         return error;
 141 }
 142
 143 void
 144 platform_flush_device(int fd, dev_t device)
 145 {
 146         struct stat     st;
 147         if (major(device) == RAMDISK_MAJOR)
 148                 return;
 149
 150         if (fstat(fd, &st) < 0)
 151                 return;
 152
 153         if (S_ISREG(st.st_mode))
 154                 fsync(fd);
 155         else
 156                 ioctl(fd, BLKFLSBUF, 0);
 157 }
 158
 159 void
 160 platform_findsizes(char *path, int fd, long long *sz, int *bsz)
 161 {
 162         struct stat     st;
 163         uint64_t        size;
 164         int             error;
 165
 166         if (fstat(fd, &st) < 0) {
 167                 fprintf(stderr, _("%s: "
 168                         "cannot stat the device file \"%s\": %s\n"),
 169                         progname, path, strerror(errno));
 170                 exit(1);
 171         }
 172
 173         if ((st.st_mode & S_IFMT) == S_IFREG) {
 174                 struct dioattr  da;
 175
 176                 *sz = (long long)(st.st_size >> 9);
 177
 178                 if (ioctl(fd, XFS_IOC_DIOINFO, &da) < 0) {
 179                         /*
 180                          * fall back to BBSIZE; mkfs might fail if there's a
 181                          * size mismatch between the image & the host fs...
 182                          */
 183                         *bsz = BBSIZE;
 184                 } else
 185                         *bsz = da.d_miniosz;
 186
 187                 if (*bsz > max_block_alignment)
 188                         max_block_alignment = *bsz;
 189                 return;
 190         }
 191
 192         error = ioctl(fd, BLKGETSIZE64, &size);
 193         if (error >= 0) {
 194                 /* BLKGETSIZE64 returns size in bytes not 512-byte blocks */
 195                 *sz = (long long)(size >> 9);
 196         } else {
 197                 /* If BLKGETSIZE64 fails, try BLKGETSIZE */
 198                 unsigned long tmpsize;
 199
 200                 error = ioctl(fd, BLKGETSIZE, &tmpsize);
 201                 if (error < 0) {
 202                         fprintf(stderr, _("%s: can't determine device size\n"),
 203                                 progname);
 204                         exit(1);
 205                 }
 206                 *sz = (long long)tmpsize;
 207         }
 208
 209         if (ioctl(fd, BLKSSZGET, bsz) < 0) {
 210                 fprintf(stderr, _("%s: warning - cannot get sector size "
 211                                 "from block device %s: %s\n"),
 212                         progname, path, strerror(errno));
 213                 *bsz = BBSIZE;
 214         }
 215         if (*bsz > max_block_alignment)
 216                 max_block_alignment = *bsz;
 217 }
 218
 219 char *
 220 platform_findrawpath(char *path)
 221 {
 222         return path;
 223 }
 224
 225 char *
 226 platform_findblockpath(char *path)
 227 {
 228         return path;
 229 }
 230
 231 int
 232 platform_direct_blockdev(void)
 233 {
 234         return 1;
 235 }
 236
 237 int
 238 platform_align_blockdev(void)
 239 {
 240         if (!max_block_alignment)
 241                 return getpagesize();
 242         return max_block_alignment;
 243 }
 244
 245 int
 246 platform_nproc(void)
 247 {
 248         return sysconf(_SC_NPROCESSORS_ONLN);
 249 }
 250
 251 unsigned long
 252 platform_physmem(void)
 253 {
 254         struct sysinfo  si;
 255
 256         if (sysinfo(&si) < 0) {
 257                 fprintf(stderr, _("%s: can't determine memory size\n"),
 258                         progname);
 259                 exit(1);
 260         }
 261         return (si.totalram >> 10) * si.mem_unit;       /* kilobytes */
 262 }