openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

dm ioctl: filter the returned values according to name or uuid prefix 

If we set non-empty param->name or param->uuid on the DM_LIST_DEVICES_CMD
ioctl, the set values are considered filter prefixes. The ioctl will only
return entries with matching name or uuid prefix.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2021-03-11 13:27:29 -05:00 committed by Mike Snitzer
parent 8b638081bd
commit c909085bb3
1 changed files with 28 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/md/dm-ioctl.c
View File

@ -540,6 +540,30 @@ static void *get_result_buffer(struct dm_ioctl *param, size_t param_size,
return ((void *) param) + param->data_start;
}
static bool filter_device(struct hash_cell *hc, const char *pfx_name, const char *pfx_uuid)
{
const char *val;
size_t val_len, pfx_len;
val = hc->name;
val_len = strlen(val);
pfx_len = strnlen(pfx_name, DM_NAME_LEN);
if (pfx_len > val_len)
return false;
if (memcmp(val, pfx_name, pfx_len))
return false;
val = hc->uuid ? hc->uuid : "";
val_len = strlen(val);
pfx_len = strnlen(pfx_uuid, DM_UUID_LEN);
if (pfx_len > val_len)
return false;
if (memcmp(val, pfx_uuid, pfx_len))
return false;
return true;
}
static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_size)
{
struct rb_node *n;
@ -557,6 +581,8 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
*/
for (n = rb_first(&name_rb_tree); n; n = rb_next(n)) {
hc = container_of(n, struct hash_cell, name_node);
if (!filter_device(hc, param->name, param->uuid))
continue;
needed += align_val(offsetof(struct dm_name_list, name) + strlen(hc->name) + 1);
needed += align_val(sizeof(uint32_t) * 2);
if (param->flags & DM_UUID_FLAG && hc->uuid)
@ -581,6 +607,8 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
for (n = rb_first(&name_rb_tree); n; n = rb_next(n)) {
void *uuid_ptr;
hc = container_of(n, struct hash_cell, name_node);
if (!filter_device(hc, param->name, param->uuid))
continue;
if (old_nl)
old_nl->next = (uint32_t) ((void *) nl -
(void *) old_nl);