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authorLennart Weller <lhw@ring0.de>2016-05-25 10:36:24 +0000
committerLennart Weller <lhw@ring0.de>2016-05-25 10:36:24 +0000
commitb4f64f72a3e4bf590c60b0cbd6cd365aa1a58542 (patch)
treee6706c727a1fedb44da614453ad3e429a7403a9b /src/proc_self_mountinfo.c
parentImported Upstream version 1.1.0 (diff)
downloadnetdata-b4f64f72a3e4bf590c60b0cbd6cd365aa1a58542.tar.xz
netdata-b4f64f72a3e4bf590c60b0cbd6cd365aa1a58542.zip
Imported Upstream version 1.2.0upstream/1.2.0
Diffstat (limited to 'src/proc_self_mountinfo.c')
-rw-r--r--src/proc_self_mountinfo.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/src/proc_self_mountinfo.c b/src/proc_self_mountinfo.c
new file mode 100644
index 000000000..45630b4c0
--- /dev/null
+++ b/src/proc_self_mountinfo.c
@@ -0,0 +1,231 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "common.h"
+#include "log.h"
+#include "appconfig.h"
+
+#include "proc_self_mountinfo.h"
+
+// 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)
+ return mi;
+
+ return NULL;
+}
+
+// find the mount info with the given filesystem and mount_source
+// in the supplied linked list of mountinfo structures
+struct mountinfo *mountinfo_find_by_filesystem_mount_source(struct mountinfo *root, const char *filesystem, const char *mount_source) {
+ struct mountinfo *mi;
+ uint32_t filesystem_hash = simple_hash(filesystem), mount_source_hash = simple_hash(mount_source);
+
+ for(mi = root; mi ; mi = mi->next)
+ if(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))
+ return mi;
+
+ return NULL;
+}
+
+struct mountinfo *mountinfo_find_by_filesystem_super_option(struct mountinfo *root, const char *filesystem, const char *super_options) {
+ struct mountinfo *mi;
+ uint32_t filesystem_hash = simple_hash(filesystem);
+
+ size_t solen = strlen(super_options);
+
+ for(mi = root; mi ; mi = mi->next)
+ if(mi->filesystem
+ && mi->super_options
+ && mi->filesystem_hash == filesystem_hash
+ && !strcmp(mi->filesystem, filesystem)) {
+
+ // super_options is a comma separated list
+ char *s = mi->super_options, *e;
+ while(*s) {
+ e = ++s;
+ while(*e && *e != ',') e++;
+
+ size_t len = e - s;
+ if(len == solen && !strncmp(s, super_options, len))
+ return mi;
+
+ if(*e == ',') s = ++e;
+ else s = e;
+ }
+ }
+
+ return NULL;
+}
+
+
+// free a linked list of mountinfo structures
+void mountinfo_free(struct mountinfo *mi) {
+ if(unlikely(!mi))
+ return;
+
+ if(likely(mi->next))
+ mountinfo_free(mi->next);
+
+ if(mi->root) free(mi->root);
+ if(mi->mount_point) free(mi->mount_point);
+ if(mi->mount_options) free(mi->mount_options);
+
+/*
+ if(mi->optional_fields_count) {
+ int i;
+ for(i = 0; i < mi->optional_fields_count ; i++)
+ free(*mi->optional_fields[i]);
+ }
+ free(mi->optional_fields);
+*/
+ free(mi->filesystem);
+ free(mi->mount_source);
+ free(mi->super_options);
+ free(mi);
+}
+
+// read the whole mountinfo into a linked list
+struct mountinfo *mountinfo_read() {
+ procfile *ff = NULL;
+
+ 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) {
+ snprintfz(filename, FILENAME_MAX, "%s/proc/1/mountinfo", global_host_prefix);
+ ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT);
+ if(!ff) return NULL;
+ }
+
+ ff = procfile_readall(ff);
+ if(!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)
+ continue;
+
+ mi = malloc(sizeof(struct mountinfo));
+ if(unlikely(!mi)) fatal("Cannot allocate memory for 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++;
+
+ char *major = procfile_lineword(ff, l, w), *minor; w++;
+ for(minor = major; *minor && *minor != ':' ;minor++) ;
+ *minor = '\0';
+ minor++;
+
+ mi->major = strtoul(major, NULL, 10);
+ mi->minor = strtoul(minor, NULL, 10);
+
+ mi->root = strdup(procfile_lineword(ff, l, w)); w++;
+ if(unlikely(!mi->root)) fatal("Cannot allocate memory");
+ mi->root_hash = simple_hash(mi->root);
+
+ mi->mount_point = strdup(procfile_lineword(ff, l, w)); w++;
+ if(unlikely(!mi->mount_point)) fatal("Cannot allocate memory");
+ mi->mount_point_hash = simple_hash(mi->mount_point);
+
+ mi->mount_options = strdup(procfile_lineword(ff, l, w)); w++;
+ if(unlikely(!mi->mount_options)) fatal("Cannot allocate memory");
+
+ // count the optional fields
+/*
+ unsigned long wo = w;
+*/
+ mi->optional_fields_count = 0;
+ char *s = procfile_lineword(ff, l, w);
+ while(*s && *s != '-') {
+ w++;
+ s = procfile_lineword(ff, l, w);
+ mi->optional_fields_count++;
+ }
+
+/*
+ if(unlikely(mi->optional_fields_count)) {
+ // 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);
+
+ 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");
+ wo++;
+ }
+ }
+ else
+ mi->optional_fields = NULL;
+*/
+
+ if(likely(*s == '-')) {
+ w++;
+
+ mi->filesystem = strdup(procfile_lineword(ff, l, w)); w++;
+ if(!mi->filesystem) fatal("Cannot allocate memory");
+ mi->filesystem_hash = simple_hash(mi->filesystem);
+
+ mi->mount_source = strdup(procfile_lineword(ff, l, w)); w++;
+ if(!mi->mount_source) fatal("Cannot allocate memory");
+ mi->mount_source_hash = simple_hash(mi->mount_source);
+
+ mi->super_options = strdup(procfile_lineword(ff, l, w)); w++;
+ if(!mi->super_options) fatal("Cannot allocate memory");
+ }
+ else {
+ mi->filesystem = NULL;
+ mi->mount_source = NULL;
+ mi->super_options = NULL;
+ }
+
+/*
+ info("MOUNTINFO: %u %u %u:%u root '%s', mount point '%s', mount options '%s', filesystem '%s', mount source '%s', super options '%s'",
+ mi->id,
+ mi->parentid,
+ mi->major,
+ mi->minor,
+ mi->root,
+ mi->mount_point,
+ mi->mount_options,
+ mi->filesystem,
+ mi->mount_source,
+ mi->super_options
+ );
+*/
+ }
+
+ procfile_close(ff);
+ return root;
+}