ANDROID: dm-bow: remove dm-bow

dm-bow provides checkpoint functionality for filesystems that do not
have built in checkpointings (like ext4). As of Android 13, using f2fs
is mandatory for userdata, so we no longer need dm-bow.

Bug: 129280212
Test: Builds
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I5f1c50dc89925debcfb1b32ec43fed981ce016a3

Documentation/device-mapper/dm-bow.txt

@@ -1,99 +0,0 @@
-dm_bow (backup on write)
-========================
-
-dm_bow is a device mapper driver that uses the free space on a device to back up
-data that is overwritten. The changes can then be committed by a simple state
-change, or rolled back by removing the dm_bow device and running a command line
-utility over the underlying device.
-
-dm_bow has three states, set by writing ‘1’ or ‘2’ to /sys/block/dm-?/bow/state.
-It is only possible to go from state 0 (initial state) to state 1, and then from
-state 1 to state 2.
-
-State 0: dm_bow collects all trims to the device and assumes that these mark
-free space on the overlying file system that can be safely used. Typically the
-mount code would create the dm_bow device, mount the file system, call the
-FITRIM ioctl on the file system then switch to state 1. These trims are not
-propagated to the underlying device.
-
-State 1: All writes to the device cause the underlying data to be backed up to
-the free (trimmed) area as needed in such a way as they can be restored.
-However, the writes, with one exception, then happen exactly as they would
-without dm_bow, so the device is always in a good final state. The exception is
-that sector 0 is used to keep a log of the latest changes, both to indicate that
-we are in this state and to allow rollback. See below for all details. If there
-isn't enough free space, writes are failed with -ENOSPC.
-
-State 2: The transition to state 2 triggers replacing the special sector 0 with
-the normal sector 0, and the freeing of all state information. dm_bow then
-becomes a pass-through driver, allowing the device to continue to be used with
-minimal performance impact.
-
-Usage
-=====
-dm-bow takes one command line parameter, the name of the underlying device.
-
-dm-bow will typically be used in the following way. dm-bow will be loaded with a
-suitable underlying device and the resultant device will be mounted. A file
-system trim will be issued via the FITRIM ioctl, then the device will be
-switched to state 1. The file system will now be used as normal. At some point,
-the changes can either be committed by switching to state 2, or rolled back by
-unmounting the file system, removing the dm-bow device and running the command
-line utility. Note that rebooting the device will be equivalent to unmounting
-and removing, but the command line utility must still be run
-
-Details of operation in state 1
-===============================
-
-dm_bow maintains a type for all sectors. A sector can be any of:
-
-SECTOR0
-SECTOR0_CURRENT
-UNCHANGED
-FREE
-CHANGED
-BACKUP
-
-SECTOR0 is the first sector on the device, and is used to hold the log of
-changes. This is the one exception.
-
-SECTOR0_CURRENT is a sector picked from the FREE sectors, and is where reads and
-writes from the true sector zero are redirected to. Note that like any backup
-sector, if the sector is written to directly, it must be moved again.
-
-UNCHANGED means that the sector has not been changed since we entered state 1.
-Thus if it is written to or trimmed, the contents must first be backed up.
-
-FREE means that the sector was trimmed in state 0 and has not yet been written
-to or used for backup. On being written to, a FREE sector is changed to CHANGED.
-
-CHANGED means that the sector has been modified, and can be further modified
-without further backup.
-
-BACKUP means that this is a free sector being used as a backup. On being written
-to, the contents must first be backed up again.
-
-All backup operations are logged to the first sector. The log sector has the
-format:
---------------------------------------------------------
-| Magic | Count | Sequence | Log entry | Log entry | …
---------------------------------------------------------
-
-Magic is a magic number. Count is the number of log entries. Sequence is 0
-initially. A log entry is
-
------------------------------------
-| Source | Dest | Size | Checksum |
------------------------------------
-
-When SECTOR0 is full, the log sector is backed up and another empty log sector
-created with sequence number one higher. The first entry in any log entry with
-sequence > 0 therefore must be the log of the backing up of the previous log
-sector. Note that sequence is not strictly needed, but is a useful sanity check
-and potentially limits the time spent trying to restore a corrupted snapshot.
-
-On entering state 1, dm_bow has a list of free sectors. All other sectors are
-unchanged. Sector0_current is selected from the free sectors and the contents of
-sector 0 are copied there. The sector 0 is backed up, which triggers the first
-log entry to be written.
-

arch/arm64/configs/gki_defconfig

@@ -316,7 +316,6 @@ CONFIG_DM_SNAPSHOT=y
 CONFIG_DM_UEVENT=y
 CONFIG_DM_VERITY=y
 CONFIG_DM_VERITY_FEC=y
-CONFIG_DM_BOW=y
 CONFIG_NETDEVICES=y
 CONFIG_DUMMY=y
 CONFIG_WIREGUARD=y

arch/x86/configs/gki_defconfig

@@ -290,7 +290,6 @@ CONFIG_DM_SNAPSHOT=y
 CONFIG_DM_UEVENT=y
 CONFIG_DM_VERITY=y
 CONFIG_DM_VERITY_FEC=y
-CONFIG_DM_BOW=y
 CONFIG_NETDEVICES=y
 CONFIG_DUMMY=y
 CONFIG_WIREGUARD=y

drivers/md/Kconfig

@@ -673,18 +673,6 @@ config DM_AUDIT
 	  Enables audit logging of several security relevant events in the
 	  particular device-mapper targets, especially the integrity target.
 
-config DM_BOW
-	tristate "Backup block device"
-	depends on BLK_DEV_DM
-	select DM_BUFIO
-	help
-	  This device-mapper target takes a device and keeps a log of all
-	  changes using free blocks identified by issuing a trim command.
-	  This can then be restored by running a command line utility,
-	  or committed by simply replacing the target.
-
-	  If unsure, say N.
-
 config DM_USER
 	tristate "Block device in userspace"
 	depends on BLK_DEV_DM

drivers/md/Makefile

@@ -84,7 +84,6 @@ obj-$(CONFIG_DM_LOG_WRITES)	+= dm-log-writes.o
 obj-$(CONFIG_DM_INTEGRITY)	+= dm-integrity.o
 obj-$(CONFIG_DM_ZONED)		+= dm-zoned.o
 obj-$(CONFIG_DM_WRITECACHE)	+= dm-writecache.o
-obj-$(CONFIG_DM_BOW)		+= dm-bow.o
 obj-$(CONFIG_DM_USER)		+= dm-user.o
 
 ifeq ($(CONFIG_DM_INIT),y)