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-rw-r--r--src/proc_self_mountinfo.c236
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;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 03:21:28 +0000