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annotate src/lib/mountpoint.c @ 4187:e6d38617efdf HEAD

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Added mountpoint_get() for looking up a path's mount point information.
author Timo Sirainen <tss@iki.fi>
date Fri, 14 Apr 2006 13:26:55 +0300
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children 1fb345878e1b
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4187
e6d38617efdf Added mountpoint_get() for looking up a path's mount point information.
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1 /* Copyright (c) 2006 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "mountpoint.h"
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5
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6 #include <sys/stat.h>
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7
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8 #ifdef HAVE_STATFS_MNTFROMNAME
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9 # include <sys/param.h> /* BSDs */
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10 # include <sys/mount.h>
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11 #elif defined(HAVE_MNTENT_H)
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12 # include <stdio.h>
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13 # include <mntent.h> /* Linux */
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14 #elif defined(HAVE_SYS_MNTTAB_H)
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15 # include <stdio.h>
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16 # include <sys/mnttab.h> /* Solaris */
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17 #else
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18 # define MOUNTPOINT_UNKNOWN
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19 #endif
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20
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21 #define MTAB_PATH "/etc/mtab"
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22
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23 /* AIX doesn't have these defined */
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24 #ifndef MNTTYPE_SWAP
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25 # define MNTTYPE_SWAP "swap"
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26 #endif
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27 #ifndef MNTTYPE_IGNORE
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28 # define MNTTYPE_IGNORE "ignore"
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29 #endif
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30
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31 int mountpoint_get(const char *path, pool_t pool, struct mountpoint *point_r)
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32 {
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33 #ifdef MOUNTPOINT_UNKNOWN
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34 errno = ENOSYS;
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35 return -1;
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36 #elif defined (HAVE_STATFS_MNTFROMNAME)
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37 /* BSDs */
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38 struct statfs buf;
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39
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40 memset(point_r, 0, sizeof(*point_r));
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41 if (statfs(path, &buf) < 0) {
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42 i_error("statfs(%s) failed: %m", path);
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43 return -1;
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44 }
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45
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46 point_r->device_path = p_strdup(pool, buf.f_mntfromname);
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47 point_r->mount_path = p_strdup(pool, buf.f_mntonname);
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48 point_r->mount_path = p_strdup(pool, buf.f_fstypename);
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49 point_r->block_size = buf.f_bsize;
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50 return 1;
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51 #else
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52 /* Linux, Solaris: /etc/mtab reading */
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53 #ifdef HAVE_SYS_MNTTAB_H
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54 struct mnttab ent;
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55 #else
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56 struct mntent *ent;
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57 #endif
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58 struct stat st, st2;
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59 const char *device_path = NULL, *mount_path = NULL, *type = NULL;
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60 unsigned int block_size;
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61 FILE *f;
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62
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63 if (stat(path, &st) < 0) {
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64 i_error("stat(%s) failed: %m", path);
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65 return -1;
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66 }
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67 block_size = st.st_blksize;
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68
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69 #ifdef HAVE_SYS_MNTTAB_H
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70 /* Solaris */
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71 f = fopen(MTAB_PATH, "r");
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72 if (f == NULL) {
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73 i_error("fopen(%s) failed: %m", MTAB_PATH);
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74 return -1;
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75 }
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76 while ((getmntent(f, &ent)) == 0) {
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77 if (strcmp(ent.mnt_fstype, MNTTYPE_SWAP) == 0 ||
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78 strcmp(ent.mnt_fstype, MNTTYPE_IGNORE) == 0)
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79 continue;
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80
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81 if (stat(ent.mnt_mountp, &st2) == 0 &&
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82 CMP_DEV_T(st.st_dev, st2.st_dev)) {
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83 device_path = ent.mnt_special;
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84 mount_path = ent.mnt_mountp;
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85 type = ent.mnt_fstype;
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86 break;
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87 }
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88 }
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89 fclose(f);
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90 #else
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91 /* Linux */
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92 f = setmntent(MTAB_PATH, "r");
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93 if (f == NULL) {
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94 i_error("setmntent(%s) failed: %m", MTAB_PATH);
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95 return -1;
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96 }
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97 while ((ent = getmntent(f)) != NULL) {
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98 if (strcmp(ent->mnt_type, MNTTYPE_SWAP) == 0 ||
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99 strcmp(ent->mnt_type, MNTTYPE_IGNORE) == 0)
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100 continue;
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101
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102 if (stat(ent->mnt_dir, &st2) == 0 &&
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103 CMP_DEV_T(st.st_dev, st2.st_dev)) {
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104 device_path = ent->mnt_fsname;
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105 mount_path = ent->mnt_dir;
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106 type = ent->mnt_type;
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107 break;
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108 }
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109 }
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110 endmntent(f);
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111 #endif
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112 if (device_path == NULL)
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113 return 0;
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114
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115 point_r->device_path = p_strdup(pool, device_path);
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116 point_r->mount_path = p_strdup(pool, mount_path);
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117 point_r->type = p_strdup(pool, type);
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118 point_r->block_size = block_size;
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119
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120 return 1;
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121 #endif
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122 }