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Commitc2a74ed049("btrfs: derive f_fsid from on-disk fsid and dev_t") mixed dev_t into f_fsid for all single-device setups to avoid f_fsid collisions with cloned filesystems. However, doing this unconditionally breaks backward compatibility. statfs(2) f_fsid changes after a kernel upgrade, and also can shift across reboots or dev re-attaches as dev_t values change. Fix this by only mixing dev_t when temp_fsid is active. This means for non-temp_fsid setups or the original mount, we use the old method of deriving fsid based on the UUID. So in the case of a cloned Btrfs filesystem, we won't be able to maintain the same fsid across mount recycle if the mount order changes. Reported-by: Dave Hansen <dave.hansen@intel.com> Link: https://lore.kernel.org/linux-btrfs/be0c08f5-2f31-40f5-8a3b-f2f58b3e00ff@intel.com Fixes:c2a74ed049("btrfs: derive f_fsid from on-disk fsid and dev_t") CC: stable@vger.kernel.org # 7.2 Signed-off-by: Anand Jain <asj@kernel.org> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2748 lines
79 KiB
2748 lines
79 KiB