f2fs: checkpoint disabling
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>
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index ab8d377..9bc8f69 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -16,6 +16,7 @@
#include "f2fs.h"
#include "node.h"
+#include "segment.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/f2fs.h>
@@ -269,6 +270,9 @@
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
+ err = f2fs_is_checkpoint_ready(sbi);
+ if (err)
+ return err;
err = dquot_initialize(dir);
if (err)
@@ -316,6 +320,9 @@
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
+ err = f2fs_is_checkpoint_ready(sbi);
+ if (err)
+ return err;
err = fscrypt_prepare_link(old_dentry, dir, dentry);
if (err)
@@ -562,6 +569,9 @@
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
+ err = f2fs_is_checkpoint_ready(sbi);
+ if (err)
+ return err;
err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
&disk_link);
@@ -693,6 +703,9 @@
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
+ err = f2fs_is_checkpoint_ready(sbi);
+ if (err)
+ return err;
err = dquot_initialize(dir);
if (err)
@@ -828,6 +841,9 @@
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
+ err = f2fs_is_checkpoint_ready(sbi);
+ if (err)
+ return err;
if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
(!projid_eq(F2FS_I(new_dir)->i_projid,
@@ -1018,6 +1034,9 @@
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
+ err = f2fs_is_checkpoint_ready(sbi);
+ if (err)
+ return err;
if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
!projid_eq(F2FS_I(new_dir)->i_projid,