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#include "common.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 + 1;
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);
freez(mi->root);
freez(mi->mount_point);
freez(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);
*/
freez(mi->filesystem);
freez(mi->mount_source);
freez(mi->super_options);
freez(mi);
}
static char *strdupz_decoding_octal(const char *string) {
char *buffer = strdupz(string);
char *d = buffer;
const char *s = string;
while(*s) {
if(unlikely(*s == '\\')) {
s++;
if(likely(isdigit(*s) && isdigit(s[1]) && isdigit(s[2]))) {
char c = *s++ - '0';
c <<= 3;
c |= *s++ - '0';
c <<= 3;
c |= *s++ - '0';
*d++ = c;
}
else *d++ = '_';
}
else *d++ = *s++;
}
*d = '\0';
return buffer;
}
// 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 = 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++;
char *major = procfile_lineword(ff, l, w), *minor; w++;
for(minor = major; *minor && *minor != ':' ;minor++) ;
if(!*minor) {
error("Cannot parse major:minor on '%s' at line %lu of '%s'", major, l + 1, filename);
continue;
}
*minor = '\0';
minor++;
mi->major = strtoul(major, NULL, 10);
mi->minor = strtoul(minor, NULL, 10);
mi->root = strdupz(procfile_lineword(ff, l, w)); w++;
mi->root_hash = simple_hash(mi->root);
mi->mount_point = strdupz_decoding_octal(procfile_lineword(ff, l, w)); w++;
mi->mount_point_hash = simple_hash(mi->mount_point);
mi->mount_options = strdupz(procfile_lineword(ff, l, w)); w++;
// 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 = 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_hash = simple_hash(mi->mount_source);
mi->super_options = strdupz(procfile_lineword(ff, l, w)); w++;
}
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;
}
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