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libdm: improve detection of mounted fs

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To detect mounted device, use also /proc/self/mountinfo
as so far the check was only able to detect ext4 mounted filesystem.

TODO:
Once proper testing for this feature is added, it may appear,
mountinfo check is enough and covers all cases and sysfs check
could be removed.
This commit is contained in:
Zdenek Kabelac 2013-05-16 11:55:51 +02:00
parent 1f30e5a052
commit 7fab9a9dda
2 changed files with 39 additions and 0 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.78 -
===================================
Detecte mounted fs also via reading /proc/self/mountinfo.
Add dm_mountinfo_read() for parsing /proc/self/mountinfo.
Report error for nonexisting devices in dmeventd communication.
Prevent double free error after dmeventd call of _fill_device_data().

38
libdm/libdm-common.c
View File

@ -1842,10 +1842,48 @@ static int _mounted_fs_on_device(const char *kernel_dev_name)
return r;
}
struct mountinfo_s {
unsigned maj;
unsigned min;
int mounted;
};
static int _device_has_mounted_fs(char *buffer, unsigned major, unsigned minor,
char *target, void *cb_data)
{
struct mountinfo_s *data = cb_data;
char kernel_dev_name[PATH_MAX];
if ((major == data->maj) && (minor == data->min)) {
if (!dm_device_get_name(major, minor, 1, kernel_dev_name, PATH_MAX)) {
stack;
*kernel_dev_name = '\0';
}
log_verbose("Device %s (%u:%u) appears to be mounted on %s.",
kernel_dev_name, major, minor, target);
data->mounted = 1;
}
return 1;
}
int dm_device_has_mounted_fs(uint32_t major, uint32_t minor)
{
char kernel_dev_name[PATH_MAX];
struct mountinfo_s data = {
.maj = major,
.min = minor,
};
if (!dm_mountinfo_read(_device_has_mounted_fs, &data))
stack;
if (data.mounted)
return 1;
/*
* TODO: Verify dm_mountinfo_read() is superset
* and remove sysfs check (namespaces)
*/
/* Get kernel device name first */
if (!dm_device_get_name(major, minor, 1, kernel_dev_name, PATH_MAX))
return 0;