diff options
Diffstat (limited to 'src/proc_self_mountinfo.c')
| -rw-r--r-- | src/proc_self_mountinfo.c | 236 |
1 files changed, 197 insertions, 39 deletions
diff --git a/src/proc_self_mountinfo.c b/src/proc_self_mountinfo.c index 51aea7ae..d07f2251 100644 --- a/src/proc_self_mountinfo.c +++ b/src/proc_self_mountinfo.c @@ -1,12 +1,55 @@ #include "common.h" +// ---------------------------------------------------------------------------- +// taken from gnulib/mountlist.c + +#ifndef ME_REMOTE +/* A file system is "remote" if its Fs_name contains a ':' + or if (it is of type (smbfs or cifs) and its Fs_name starts with '//') + or Fs_name is equal to "-hosts" (used by autofs to mount remote fs). */ +# define ME_REMOTE(Fs_name, Fs_type) \ + (strchr (Fs_name, ':') != NULL \ + || ((Fs_name)[0] == '/' \ + && (Fs_name)[1] == '/' \ + && (strcmp (Fs_type, "smbfs") == 0 \ + || strcmp (Fs_type, "cifs") == 0)) \ + || (strcmp("-hosts", Fs_name) == 0)) +#endif + +#define ME_DUMMY_0(Fs_name, Fs_type) \ + (strcmp (Fs_type, "autofs") == 0 \ + || strcmp (Fs_type, "proc") == 0 \ + || strcmp (Fs_type, "subfs") == 0 \ + /* for Linux 2.6/3.x */ \ + || strcmp (Fs_type, "debugfs") == 0 \ + || strcmp (Fs_type, "devpts") == 0 \ + || strcmp (Fs_type, "fusectl") == 0 \ + || strcmp (Fs_type, "mqueue") == 0 \ + || strcmp (Fs_type, "rpc_pipefs") == 0 \ + || strcmp (Fs_type, "sysfs") == 0 \ + /* FreeBSD, Linux 2.4 */ \ + || strcmp (Fs_type, "devfs") == 0 \ + /* for NetBSD 3.0 */ \ + || strcmp (Fs_type, "kernfs") == 0 \ + /* for Irix 6.5 */ \ + || strcmp (Fs_type, "ignore") == 0) + +/* Historically, we have marked as "dummy" any file system of type "none", + but now that programs like du need to know about bind-mounted directories, + we grant an exception to any with "bind" in its list of mount options. + I.e., those are *not* dummy entries. */ +# define ME_DUMMY(Fs_name, Fs_type) \ + (ME_DUMMY_0 (Fs_name, Fs_type) || strcmp (Fs_type, "none") == 0) + +// ---------------------------------------------------------------------------- + // find the mount info with the given major:minor // in the supplied linked list of mountinfo structures struct mountinfo *mountinfo_find(struct mountinfo *root, unsigned long major, unsigned long minor) { struct mountinfo *mi; for(mi = root; mi ; mi = mi->next) - if(mi->major == major && mi->minor == minor) + if(unlikely(mi->major == major && mi->minor == minor)) return mi; return NULL; @@ -19,12 +62,12 @@ struct mountinfo *mountinfo_find_by_filesystem_mount_source(struct mountinfo *ro uint32_t filesystem_hash = simple_hash(filesystem), mount_source_hash = simple_hash(mount_source); for(mi = root; mi ; mi = mi->next) - if(mi->filesystem + if(unlikely(mi->filesystem && mi->mount_source && mi->filesystem_hash == filesystem_hash && mi->mount_source_hash == mount_source_hash && !strcmp(mi->filesystem, filesystem) - && !strcmp(mi->mount_source, mount_source)) + && !strcmp(mi->mount_source, mount_source))) return mi; return NULL; @@ -37,10 +80,10 @@ struct mountinfo *mountinfo_find_by_filesystem_super_option(struct mountinfo *ro size_t solen = strlen(super_options); for(mi = root; mi ; mi = mi->next) - if(mi->filesystem + if(unlikely(mi->filesystem && mi->super_options && mi->filesystem_hash == filesystem_hash - && !strcmp(mi->filesystem, filesystem)) { + && !strcmp(mi->filesystem, filesystem))) { // super_options is a comma separated list char *s = mi->super_options, *e; @@ -49,7 +92,7 @@ struct mountinfo *mountinfo_find_by_filesystem_super_option(struct mountinfo *ro while(*e && *e != ',') e++; size_t len = e - s; - if(len == solen && !strncmp(s, super_options, len)) + if(unlikely(len == solen && !strncmp(s, super_options, len))) return mi; if(*e == ',') s = ++e; @@ -72,6 +115,7 @@ void mountinfo_free(struct mountinfo *mi) { freez(mi->root); freez(mi->mount_point); freez(mi->mount_options); + freez(mi->persistent_id); /* if(mi->optional_fields_count) { @@ -113,56 +157,65 @@ static char *strdupz_decoding_octal(const char *string) { return buffer; } -// read the whole mountinfo into a linked list -struct mountinfo *mountinfo_read() { - procfile *ff = NULL; +static inline int is_read_only(const char *s) { + if(!s) return 0; + + size_t len = strlen(s); + if(len < 2) return 0; + if(len == 2) { + if(!strcmp(s, "ro")) return 1; + return 0; + } + if(!strncmp(s, "ro,", 3)) return 1; + if(!strncmp(&s[len - 3], ",ro", 3)) return 1; + if(strstr(s, ",ro,")) return 1; + return 0; +} +// read the whole mountinfo into a linked list +struct mountinfo *mountinfo_read(int do_statvfs) { char filename[FILENAME_MAX + 1]; snprintfz(filename, FILENAME_MAX, "%s/proc/self/mountinfo", global_host_prefix); - ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT); - if(!ff) { + procfile *ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT); + if(unlikely(!ff)) { snprintfz(filename, FILENAME_MAX, "%s/proc/1/mountinfo", global_host_prefix); ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT); - if(!ff) return NULL; + if(unlikely(!ff)) return NULL; } ff = procfile_readall(ff); - if(!ff) return NULL; + if(unlikely(!ff)) + return NULL; struct mountinfo *root = NULL, *last = NULL, *mi = NULL; unsigned long l, lines = procfile_lines(ff); for(l = 0; l < lines ;l++) { - if(procfile_linewords(ff, l) < 5) + if(unlikely(procfile_linewords(ff, l) < 5)) continue; mi = mallocz(sizeof(struct mountinfo)); - if(unlikely(!root)) - root = last = mi; - else - last->next = mi; - - last = mi; - mi->next = NULL; - unsigned long w = 0; - mi->id = strtoul(procfile_lineword(ff, l, w), NULL, 10); w++; - mi->parentid = strtoul(procfile_lineword(ff, l, w), NULL, 10); w++; + mi->id = str2ul(procfile_lineword(ff, l, w)); w++; + mi->parentid = str2ul(procfile_lineword(ff, l, w)); w++; char *major = procfile_lineword(ff, l, w), *minor; w++; for(minor = major; *minor && *minor != ':' ;minor++) ; - if(!*minor) { + if(unlikely(!*minor)) { error("Cannot parse major:minor on '%s' at line %lu of '%s'", major, l + 1, filename); + freez(mi); continue; } *minor = '\0'; minor++; - mi->major = strtoul(major, NULL, 10); - mi->minor = strtoul(minor, NULL, 10); + mi->flags = 0; + + mi->major = str2ul(major); + mi->minor = str2ul(minor); mi->root = strdupz(procfile_lineword(ff, l, w)); w++; mi->root_hash = simple_hash(mi->root); @@ -170,8 +223,15 @@ struct mountinfo *mountinfo_read() { mi->mount_point = strdupz_decoding_octal(procfile_lineword(ff, l, w)); w++; mi->mount_point_hash = simple_hash(mi->mount_point); + mi->persistent_id = strdupz(mi->mount_point); + netdata_fix_chart_id(mi->persistent_id); + mi->persistent_id_hash = simple_hash(mi->persistent_id); + mi->mount_options = strdupz(procfile_lineword(ff, l, w)); w++; + if(unlikely(is_read_only(mi->mount_options))) + mi->flags |= MOUNTINFO_READONLY; + // count the optional fields /* unsigned long wo = w; @@ -189,14 +249,11 @@ struct mountinfo *mountinfo_read() { // we have some optional fields // read them into a new array of pointers; - mi->optional_fields = malloc(mi->optional_fields_count * sizeof(char *)); - if(unlikely(!mi->optional_fields)) - fatal("Cannot allocate memory for %d mountinfo optional fields", mi->optional_fields_count); + mi->optional_fields = mallocz(mi->optional_fields_count * sizeof(char *)); int i; for(i = 0; i < mi->optional_fields_count ; i++) { - *mi->optional_fields[wo] = strdup(procfile_lineword(ff, l, w)); - if(!mi->optional_fields[wo]) fatal("Cannot allocate memory"); + *mi->optional_fields[wo] = strdupz(procfile_lineword(ff, l, w)); wo++; } } @@ -210,33 +267,134 @@ struct mountinfo *mountinfo_read() { mi->filesystem = strdupz(procfile_lineword(ff, l, w)); w++; mi->filesystem_hash = simple_hash(mi->filesystem); - mi->mount_source = strdupz(procfile_lineword(ff, l, w)); w++; + mi->mount_source = strdupz_decoding_octal(procfile_lineword(ff, l, w)); w++; mi->mount_source_hash = simple_hash(mi->mount_source); mi->super_options = strdupz(procfile_lineword(ff, l, w)); w++; + + if(unlikely(is_read_only(mi->super_options))) + mi->flags |= MOUNTINFO_READONLY; + + if(unlikely(ME_DUMMY(mi->mount_source, mi->filesystem))) + mi->flags |= MOUNTINFO_IS_DUMMY; + + if(unlikely(ME_REMOTE(mi->mount_source, mi->filesystem))) + mi->flags |= MOUNTINFO_IS_REMOTE; + + // mark as BIND the duplicates (i.e. same filesystem + same source) + if(do_statvfs) { + struct stat buf; + if(unlikely(stat(mi->mount_point, &buf) == -1)) { + mi->st_dev = 0; + mi->flags |= MOUNTINFO_NO_STAT; + } + else { + mi->st_dev = buf.st_dev; + + struct mountinfo *mt; + for(mt = root; mt; mt = mt->next) { + if(unlikely(mt->st_dev == mi->st_dev && !(mi->flags & MOUNTINFO_NO_STAT))) { + if(strlen(mi->mount_point) < strlen(mt->mount_point)) + mt->flags |= MOUNTINFO_IS_SAME_DEV; + else + mi->flags |= MOUNTINFO_IS_SAME_DEV; + } + } + } + } + else { + mi->st_dev = 0; + } } else { mi->filesystem = NULL; + mi->filesystem_hash = 0; + mi->mount_source = NULL; + mi->mount_source_hash = 0; + mi->super_options = NULL; + + mi->st_dev = 0; + } + + // check if it has size + if(do_statvfs) { + struct statvfs buff_statvfs; + if(unlikely(statvfs(mi->mount_point, &buff_statvfs) < 0)) { + mi->flags |= MOUNTINFO_NO_STAT; + } + else if(unlikely(!buff_statvfs.f_blocks /* || !buff_statvfs.f_files */)) { + mi->flags |= MOUNTINFO_NO_SIZE; + } } + // link it + if(unlikely(!root)) + root = mi; + else + last->next = mi; + + last = mi; + mi->next = NULL; + /* - info("MOUNTINFO: %u %u %u:%u root '%s', mount point '%s', mount options '%s', filesystem '%s', mount source '%s', super options '%s'", +#ifdef NETDATA_INTERNAL_CHECKS + fprintf(stderr, "MOUNTINFO: %ld %ld %lu:%lu root '%s', persistent id '%s', mount point '%s', mount options '%s', filesystem '%s', mount source '%s', super options '%s'%s%s%s%s%s%s\n", mi->id, mi->parentid, mi->major, mi->minor, mi->root, - mi->mount_point, - mi->mount_options, - mi->filesystem, - mi->mount_source, - mi->super_options + mi->persistent_id, + (mi->mount_point)?mi->mount_point:"", + (mi->mount_options)?mi->mount_options:"", + (mi->filesystem)?mi->filesystem:"", + (mi->mount_source)?mi->mount_source:"", + (mi->super_options)?mi->super_options:"", + (mi->flags & MOUNTINFO_IS_DUMMY)?" DUMMY":"", + (mi->flags & MOUNTINFO_IS_BIND)?" BIND":"", + (mi->flags & MOUNTINFO_IS_REMOTE)?" REMOTE":"", + (mi->flags & MOUNTINFO_NO_STAT)?" NOSTAT":"", + (mi->flags & MOUNTINFO_NO_SIZE)?" NOSIZE":"", + (mi->flags & MOUNTINFO_IS_SAME_DEV)?" SAMEDEV":"" ); +#endif */ } +/* find if the mount options have "bind" in them + { + FILE *fp = setmntent(MOUNTED, "r"); + if (fp != NULL) { + struct mntent mntbuf; + struct mntent *mnt; + char buf[4096 + 1]; + + while ((mnt = getmntent_r(fp, &mntbuf, buf, 4096))) { + char *bind = hasmntopt(mnt, "bind"); + if(unlikely(bind)) { + struct mountinfo *mi; + for(mi = root; mi ; mi = mi->next) { + if(unlikely(strcmp(mnt->mnt_dir, mi->mount_point) == 0)) { + fprintf(stderr, "Mount point '%s' is BIND\n", mi->mount_point); + mi->flags |= MOUNTINFO_IS_BIND; + break; + } + } + +#ifdef NETDATA_INTERNAL_CHECKS + if(unlikely(!mi)) { + error("Mount point '%s' not found in /proc/self/mountinfo", mnt->mnt_dir); + } +#endif + } + } + endmntent(fp); + } + } +*/ + procfile_close(ff); return root; } |