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authorLennart Poettering <lennart@poettering.net>2010-10-14 18:17:23 +0200
committerLennart Poettering <lennart@poettering.net>2010-10-14 18:17:23 +0200
commit2d9a33978247b1b640919ad5924fe270b9ddf9a1 (patch)
tree1c18f0a9b3087a66d85378be3e0cd58f7301a21a /src/umount.c
parentddd941ed5ccca94967f06ef545998340fc3bffc0 (diff)
umount: disable dm devices by devnode, not by path name
Diffstat (limited to 'src/umount.c')
-rw-r--r--src/umount.c91
1 files changed, 40 insertions, 51 deletions
diff --git a/src/umount.c b/src/umount.c
index 28cfd7e7cd..c95f72760b 100644
--- a/src/umount.c
+++ b/src/umount.c
@@ -36,20 +36,10 @@
typedef struct MountPoint {
char *path;
+ dev_t devnum;
LIST_FIELDS (struct MountPoint, mount_point);
} MountPoint;
-/* Takes over possession of path */
-static MountPoint *mount_point_alloc(char *path) {
- MountPoint *mp;
-
- if (!(mp = new(MountPoint, 1)))
- return NULL;
-
- mp->path = path;
- return mp;
-}
-
static void mount_point_remove_and_free(MountPoint *mount_point, MountPoint **mount_point_list_head) {
LIST_REMOVE(MountPoint, mount_point, *mount_point_list_head, mount_point);
@@ -113,12 +103,13 @@ static int mount_points_list_get(MountPoint **mount_point_list_head) {
continue;
}
- if (!(mp = mount_point_alloc(p))) {
+ if (!(mp = new0(MountPoint, 1))) {
free(p);
r = -ENOMEM;
goto finish;
}
+ mp->path = p;
LIST_PREPEND(MountPoint, mount_point, *mount_point_list_head, mp);
}
@@ -175,13 +166,13 @@ static int swap_list_get(MountPoint **swap_list_head) {
goto finish;
}
- swap = mount_point_alloc(d);
- if (!swap) {
+ if (!(swap = new0(MountPoint, 1))) {
free(d);
r = -ENOMEM;
goto finish;
}
+ swap->path = d;
LIST_PREPEND(MountPoint, mount_point, *swap_list_head, swap);
}
@@ -233,23 +224,26 @@ static int loopback_list_get(MountPoint **loopback_list_head) {
goto finish;
}
- if ((dn = udev_device_get_devnode(d))) {
- loop = strdup(dn);
+ if (!(dn = udev_device_get_devnode(d))) {
udev_device_unref(d);
+ continue;
+ }
- if (!loop) {
- r = -ENOMEM;
- goto finish;
- }
- } else
- udev_device_unref(d);
+ loop = strdup(dn);
+ udev_device_unref(d);
+
+ if (!loop) {
+ r = -ENOMEM;
+ goto finish;
+ }
- if (!(lb = mount_point_alloc(loop))) {
+ if (!(lb = new0(MountPoint, 1))) {
free(loop);
r = -ENOMEM;
goto finish;
}
+ lb->path = loop;
LIST_PREPEND(MountPoint, mount_point, *loopback_list_head, lb);
}
@@ -295,43 +289,42 @@ static int dm_list_get(MountPoint **dm_list_head) {
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first) {
- MountPoint *lb;
+ MountPoint *m;
struct udev_device *d;
- char *dm = NULL;
- struct udev_list_entry *dlink = NULL, *first_dlink = NULL;
+ dev_t devnum;
+ char *node;
+ const char *dn;
if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) {
r = -ENOMEM;
goto finish;
}
- first_dlink = udev_device_get_devlinks_list_entry(d);
- udev_list_entry_foreach(dlink, first_dlink) {
-
- if (startswith(udev_list_entry_get_name(dlink), "/dev/mapper/")) {
-
- if (!(dm = strdup(udev_list_entry_get_name(dlink)))) {
- udev_device_unref(d);
- r = -ENOMEM;
- goto finish;
- }
+ devnum = udev_device_get_devnum(d);
+ dn = udev_device_get_devnode(d);
- break;
- }
+ if (major(devnum) == 0 || !dn) {
+ udev_device_unref(d);
+ continue;
}
+ node = strdup(dn);
udev_device_unref(d);
- if (!dm)
- continue;
+ if (!node) {
+ r = -ENOMEM;
+ goto finish;
+ }
- if (!(lb = mount_point_alloc(dm))) {
- free(dm);
+ if (!(m = new(MountPoint, 1))) {
+ free(node);
r = -ENOMEM;
goto finish;
}
- LIST_PREPEND(MountPoint, mount_point, *dm_list_head, lb);
+ m->path = node;
+ m->devnum = devnum;
+ LIST_PREPEND(MountPoint, mount_point, *dm_list_head, m);
}
r = 0;
@@ -359,14 +352,11 @@ static int delete_loopback(const char *device) {
return (r >= 0 || errno == ENXIO) ? 0 : -errno;
}
-static int delete_dm(const char *device) {
+static int delete_dm(dev_t devnum) {
int fd, r;
struct dm_ioctl dm;
- assert(device);
-
- if (!startswith(device, "/dev/mapper/"))
- return -EIO;
+ assert(major(devnum) != 0);
if ((fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC)) < 0)
return -errno;
@@ -377,8 +367,7 @@ static int delete_dm(const char *device) {
dm.version[2] = DM_VERSION_PATCHLEVEL;
dm.data_size = sizeof(dm);
-
- strncpy(dm.name, device + 12, sizeof(dm.name));
+ dm.dev = devnum;
r = ioctl(fd, DM_DEV_REMOVE, &dm);
close_nointr_nofail(fd);
@@ -460,7 +449,7 @@ static int dm_points_list_detach(MountPoint **dm_list_head) {
int failed = 0;
LIST_FOREACH_SAFE(mount_point, dm, dm_next, *dm_list_head) {
- if (delete_dm(dm->path) == 0)
+ if (delete_dm(dm->devnum) == 0)
mount_point_remove_and_free(dm, dm_list_head);
else {
log_warning("Could not delete dm %s: %m", dm->path);