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blockdev-util: Iterate through all DM layers

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get_block_device_harder_fd() currently only traverses one level of
device mapper stacking when looking for the underlying block device.
This causes issues with nested DM setups like dm-crypt on top of
dm-integrity, where we don't traverse enough to get the actual physical
device.

Fix this by iterating through all DM layers until we reach a device with
no underlying device.

Fixes: #40419
This commit is contained in:
Chris Down
2026-01-23 21:27:12 +08:00
parent 53c7b19572
commit b38943b01b
1 changed files with 3 additions and 3 deletions
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src/shared/blockdev-util.c
+3 -3
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@@ -346,14 +346,14 @@ int get_block_device_harder_fd(int fd, dev_t *ret) {
assert(fd >= 0);
assert(ret);
/* Gets the backing block device for a file system, and handles LUKS encrypted file systems, looking for its
* immediate parent, if there is one. */
/* Gets the backing block device for a file system, and handles LUKS encrypted file systems, looking
* for its underlying physical device, if there is one. */
r = get_block_device_fd(fd, ret);
if (r <= 0)
return r;
r = block_get_originating(*ret, ret, /* recursive= */ false);
r = block_get_originating(*ret, ret, /* recursive= */ true);
if (r < 0)
log_debug_errno(r, "Failed to chase block device, ignoring: %m");