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f2fs: checkpoint disabling

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Note that, it requires "f2fs: return correct errno in f2fs_gc".

This adds a lightweight non-persistent snapshotting scheme to f2fs.

To use, mount with the option checkpoint=disable, and to return to
normal operation, remount with checkpoint=enable. If the filesystem
is shut down before remounting with checkpoint=enable, it will revert
back to its apparent state when it was first mounted with
checkpoint=disable. This is useful for situations where you wish to be
able to roll back the state of the disk in case of some critical
failure.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
[Jaegeuk Kim: use SB_RDONLY instead of MS_RDONLY]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daniel Rosenberg 2018-08-20 19:21:43 -07:00 • committed by Jaegeuk Kim
parent fb7d70db30
commit 4354994f09
13 changed files with 324 additions and 14 deletions
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1
include/linux/f2fs_fs.h
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@ -116,6 +116,7 @@ struct f2fs_super_block {
/*
* For checkpoint
*/
#define CP_DISABLED_FLAG 0x00001000
#define CP_LARGE_NAT_BITMAP_FLAG 0x00000400
#define CP_NOCRC_RECOVERY_FLAG 0x00000200
#define CP_TRIMMED_FLAG 0x00000100