Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*)
-open Printf
-open ExtList
-open Unix
+include Diskimage_impl
-open Int63.Operators
-
-include Diskimage_utils
-
-(* Use as the natural block size for disk images, but really we should
- * use the 'blockdev -getbsz' command to find the real block size.
+(* This just forces the plug-ins to get loaded when anyone references
+ * this library. You need one line for each plug-in.
*)
-let disk_block_size = ~^512
-
-let partition_types = [
- Diskimage_mbr.plugin_id,
- ("MBR", Diskimage_mbr.probe);
-]
-
-let filesystem_types = [
- Diskimage_ext2.plugin_id,
- ("Linux ext2/3", Diskimage_ext2.probe);
- Diskimage_linux_swap.plugin_id,
- ("Linux swap", Diskimage_linux_swap.probe);
- Diskimage_linux_swsuspend.plugin_id,
- ("Linux s/w suspend", Diskimage_linux_swsuspend.probe);
-]
-
-let lvm_types = [
- Diskimage_lvm2.plugin_id,
- ("Linux LVM2", Diskimage_lvm2.probe, Diskimage_lvm2.list);
-]
-
-let name_of_parts id =
- let name, _ = List.assoc id partition_types in
- name
-let name_of_filesystem id =
- let name, _ = List.assoc id filesystem_types in
- name
-let name_of_lvm id =
- let name, _, _ = List.assoc id lvm_types in
- name
-
-(* Probe a device for partitions. Returns [Some parts] or [None]. *)
-let probe_for_partitions dev =
- if !debug then eprintf "probing for partitions on %s ...\n%!" dev#name;
- let rec loop = function
- | [] -> None
- | (parts_plugin_id, (_, probe_fn)) :: rest ->
- try Some (probe_fn dev)
- with Not_found -> loop rest
- in
- let r = loop partition_types in
- if !debug then (
- match r with
- | None -> eprintf "no partitions found on %s\n%!" dev#name
- | Some { parts_plugin_id = name; parts = parts } ->
- eprintf "found %d %s partitions on %s\n"
- (List.length parts) name dev#name
- );
- r
-
-(* Probe a device for a filesystem. Returns [Some fs] or [None]. *)
-let probe_for_filesystem dev =
- if !debug then eprintf "probing for a filesystem on %s ...\n%!" dev#name;
- let rec loop = function
- | [] -> None
- | (fs_name, (_, probe_fn)) :: rest ->
- try Some (probe_fn dev)
- with Not_found -> loop rest
- in
- let r = loop filesystem_types in
- if !debug then (
- match r with
- | None -> eprintf "no filesystem found on %s\n%!" dev#name
- | Some fs ->
- eprintf "found a filesystem on %s:\n" dev#name;
- eprintf "\t%s\n%!" fs.fs_plugin_id
- );
- r
-
-(* Probe a device for a PV. Returns [Some lvm_name] or [None]. *)
-let probe_for_pv dev =
- if !debug then eprintf "probing if %s is a PV ...\n%!" dev#name;
- let rec loop = function
- | [] -> None
- | (lvm_name, (_, probe_fn, _)) :: rest ->
- try Some (probe_fn lvm_name dev)
- with Not_found -> loop rest
- in
- let r = loop lvm_types in
- if !debug then (
- match r with
- | None -> eprintf "no PV found on %s\n%!" dev#name
- | Some { lvm_plugin_id = name } ->
- eprintf "%s contains a %s PV\n%!" dev#name name
- );
- r
-
-let list_lvs lvm_name devs =
- let _, _, list_lvs_fn = List.assoc lvm_name lvm_types in
- list_lvs_fn devs
-
-(* Create machine description. *)
-let open_machine name disks =
- let disks = List.map (
- fun (name, path) ->
- let dev = new block_device path disk_block_size (* XXX *) in
- { d_name = name; d_dev = dev; d_content = `Unknown }
- ) disks in
- { m_name = name; m_disks = disks; m_lv_filesystems = [] }
-
-let close_machine { m_disks = m_disks } =
- (* Only close the disks, assume all other devices are derived from them. *)
- List.iter (fun { d_dev = d_dev } -> d_dev#close ()) m_disks
-
-(* Main scanning function for filesystems. *)
-let scan_machine ({ m_disks = m_disks } as machine) =
- let m_disks = List.map (
- fun ({ d_dev = dev } as disk) ->
- let dev = (dev :> device) in
- (* See if it is partitioned first. *)
- let parts = probe_for_partitions dev in
- match parts with
- | Some parts ->
- { disk with d_content = `Partitions parts }
- | None ->
- (* Not partitioned. Does it contain a filesystem? *)
- let fs = probe_for_filesystem dev in
- match fs with
- | Some fs ->
- { disk with d_content = `Filesystem fs }
- | None ->
- (* Not partitioned, no filesystem, is it a PV? *)
- let pv = probe_for_pv dev in
- match pv with
- | Some lvm_name ->
- { disk with d_content = `PhysicalVolume lvm_name }
- | None ->
- disk (* Spare/unknown. *)
- ) m_disks in
-
- (* Now we have either detected partitions or a filesystem on each
- * physical device (or perhaps neither). See what is on those
- * partitions.
- *)
- let m_disks = List.map (
- function
- | ({ d_dev = dev; d_content = `Partitions parts } as disk) ->
- let ps = List.map (
- fun p ->
- if p.part_status = Bootable || p.part_status = Nonbootable then (
- let fs = probe_for_filesystem p.part_dev in
- match fs with
- | Some fs ->
- { p with part_content = `Filesystem fs }
- | None ->
- (* Is it a PV? *)
- let pv = probe_for_pv p.part_dev in
- match pv with
- | Some lvm_name ->
- { p with part_content = `PhysicalVolume lvm_name }
- | None ->
- p (* Spare/unknown. *)
- ) else p
- ) parts.parts in
- let parts = { parts with parts = ps } in
- { disk with d_content = `Partitions parts }
- | disk -> disk
- ) m_disks in
-
- (* LVM filesystem detection
- *
- * Look for all disks/partitions which have been identified as PVs
- * and pass those back to the respective LVM plugin for LV detection.
- *
- * (Note - a two-stage process because an LV can be spread over
- * several PVs, so we have to detect all PVs belonging to a
- * domain first).
- *
- * XXX To deal with RAID (ie. md devices) we will need to loop
- * around here because RAID is like LVM except that they normally
- * present as block devices which can be used by LVM.
- *)
- (* First: LV detection.
- * Find all physical volumes, can be disks or partitions.
- *)
- let pvs_on_disks = List.filter_map (
- function
- | { d_dev = d_dev;
- d_content = `PhysicalVolume pv } -> Some (pv, (d_dev :> device))
- | _ -> None
- ) m_disks in
- let pvs_on_partitions = List.map (
- function
- | { d_content = `Partitions { parts = parts } } ->
- List.filter_map (
- function
- | { part_dev = part_dev;
- part_content = `PhysicalVolume pv } ->
- Some (pv, part_dev)
- | _ -> None
- ) parts
- | _ -> []
- ) m_disks in
- let lvs = List.concat (pvs_on_disks :: pvs_on_partitions) in
-
- (* Second: filesystem on LV detection.
- * Group the LVs by plug-in type.
- *)
- let cmp (a,_) (b,_) = compare a b in
- let lvs = List.sort ~cmp lvs in
- let lvs = group_by lvs in
-
- let lvs =
- List.map (fun (pv, devs) -> list_lvs pv.lvm_plugin_id devs) lvs in
- let lvs = List.concat lvs in
-
- (* lvs is a list of potential LV devices. Now run them through the
- * probes to see if any contain filesystems.
- *)
- let filesystems =
- List.filter_map (
- fun ({ lv_dev = dev } as lv) ->
- match probe_for_filesystem dev with
- | Some fs -> Some (lv, fs)
- | None -> None
- ) lvs in
-
- { machine with
- m_disks = m_disks;
- m_lv_filesystems = filesystems }
-
-(* Ownership tables. *)
-let create_ownership machine =
- (* Iterate over all the things which can claim ownership of a
- * disk block (filesystems, partitions, PVs).
- *
- * A single disk block can be "owned" by several things (eg. it
- * could contain an LV filesystem, on a PV, on a partition).
- *)
- let rec iter_over_machine
- {m_disks = disks; m_lv_filesystems = lv_filesystems} =
- List.iter (
- function
- | { d_content = (`Filesystem fs as owner) } ->
- iter_over_filesystem disks fs owner
- | { d_content = (`Partitions parts as owner) } ->
- iter_over_partitions disks parts owner
- | { d_content = (`PhysicalVolume pv as owner) } ->
- iter_over_pv disks pv owner
- | { d_content = `Unknown } -> ()
- ) disks;
- List.iter (
- fun (lv, fs) ->
- let owner = `Filesystem fs in
- iter_over_filesystem disks fs owner
- ) lv_filesystems
-
- (* Iterate over the blocks in a single filesystem. *)
- and iter_over_filesystem disks {fs_dev = dev} owner =
- iter_over_device disks dev owner
-
- (* Iterate over the blocks in a set of partitions, then
- * iterate over the contents of the partitions.
- *)
- and iter_over_partitions disks {parts = parts; parts_dev = parts_dev} owner =
- iter_over_device disks parts_dev owner;
-
- List.iter (
- function
- | { part_content = (`Filesystem fs as owner) } ->
- iter_over_filesystem disks fs owner
- | { part_content = (`PhysicalVolume pv as owner) } ->
- iter_over_pv disks pv owner
- | { part_content = `Unknown } -> ()
- ) parts
-
- (* Iterate over the blocks in a PV. *)
- and iter_over_pv disks {pv_dev = dev} owner =
- iter_over_device disks dev owner
-
- (* Iterate over the blocks in a device, assigning ownership to 'owner'
- *
- * In reality (1): There can be several owners for each block, so we
- * incrementally add ownership. The add_ownership function takes
- * care of handling overlapping ranges, using an AVL tree.
- * In reality (2): Iterating over blocks would take ages and result
- * in a very inefficient ownership representation. Instead we look
- * at minimum contiguous extents.
- *)
- and iter_over_device disks dev owner =
- let size = dev#size in
-
- let rec loop offset =
- if offset < size then (
- let extent =
- let devs, extent = get_next_extent disks dev offset in
- if devs = [] then
- eprintf "warning: no device found under %s\n"
- (string_of_owner owner);
- List.iter (
- fun (dev, dev_offset) ->
- add_ownership dev dev_offset extent owner
- ) devs;
- extent in
- loop (offset +^ extent)
- )
- in
- loop ~^0
-
- (* Return the length of the next contiguous region in the device starting
- * at the given byte offset. Also return the underlying block device(s)
- * if there is one.
- *)
- and get_next_extent disks (dev : device) offset =
- let disks = List.map (fun { d_dev = dev } -> (dev :> device)) disks in
- map_recursively disks dev offset
-
- and map_recursively disks dev offset =
- let this_extent = dev#contiguous offset in
-
- (* If this disk is a block_device (a member of the 'disks' list)
- * then we've hit the bottom layer of devices, so just return it.
- *)
- if List.memq dev disks then
- [dev, offset], this_extent
- else (
- let blocksize = dev#blocksize in
- let block = offset /^ blocksize in
- let offset_in_block = offset -^ block *^ blocksize in
-
- (* Map from this block to the devices one layer down. *)
- let devs = dev#map_block block in
-
- (* Get the real device offsets, adding the offset from start of block. *)
- let devs =
- List.map
- (fun (dev, dev_offset) -> dev, dev_offset +^ offset_in_block)
- devs in
-
- let devs =
- List.map
- (fun (dev, dev_offset) ->
- map_recursively disks dev dev_offset)
- devs in
-
- (* Work out the minimum contiguous extent from this offset. *)
- let devs, extent =
- let extents = List.map snd devs in
- let devs = List.concat (List.map fst devs) in
- let extent = List.fold_left min this_extent extents in
- devs, extent in
-
- devs, extent
- )
-
- and string_of_owner = function
- | `Filesystem {fs_plugin_id = fs_plugin_id; fs_dev = fs_dev} ->
- sprintf "%s(%s)" fs_dev#name fs_plugin_id
- | `PhysicalVolume { pv_uuid = pv_uuid } ->
- "PV:" ^ pv_uuid
- | `Partitions { parts_plugin_id = parts_plugin_id } ->
- parts_plugin_id
-
- and add_ownership dev offset extent owner =
- let blocksize = dev#blocksize in
- let offset_in_blocks, offset_in_block =
- offset /^ blocksize, offset %^ blocksize in
- let extent_in_blocks, extent_in_block =
- extent /^ blocksize, extent %^ blocksize in
-
- eprintf "add_ownership: %s %s[%s:%s] %s[%s:%s] %s\n"
- dev#name
- (Int63.to_string offset)
- (Int63.to_string offset_in_blocks)
- (Int63.to_string offset_in_block)
- (Int63.to_string extent)
- (Int63.to_string extent_in_blocks)
- (Int63.to_string extent_in_block)
- (string_of_owner owner)
- in
- iter_over_machine machine
-
-
+let _ = Diskimage_ext2.id
+let _ = Diskimage_linux_swap.id
+let _ = Diskimage_linux_swsuspend.id
+let _ = Diskimage_fat.id
+let _ = Diskimage_ntfs.id
+let _ = Diskimage_lvm2.id
+let _ = Diskimage_mbr.id
git.annexia.org / virt-df.git / blobdiff