tune2fs: enable extent tree checksums

Add to tune2fs the ability to recalculate extent tree checksums when
altering the metadata checksum feature flag.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 826d9cc..f63cfeb 100644 (file)
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -376,6 +376,48 @@ static void request_fsck_afterwards(ext2_filsys fs)
                printf(_("(and reboot afterwards!)\n"));
 }
 
+/* Rewrite extents */
+static errcode_t rewrite_extents(ext2_filsys fs, ext2_ino_t ino,
+                                struct ext2_inode *inode)
+{
+       ext2_extent_handle_t    handle;
+       struct ext2fs_extent    extent;
+       int                     op = EXT2_EXTENT_ROOT;
+       errcode_t               errcode;
+
+       if (!(inode->i_flags & EXT4_EXTENTS_FL))
+               return 0;
+
+       errcode = ext2fs_extent_open(fs, ino, &handle);
+       if (errcode)
+               return errcode;
+
+       while (1) {
+               errcode = ext2fs_extent_get(handle, op, &extent);
+               if (errcode)
+                       break;
+
+               /* Root node is in the separately checksummed inode */
+               if (op == EXT2_EXTENT_ROOT) {
+                       op = EXT2_EXTENT_NEXT;
+                       continue;
+               }
+               op = EXT2_EXTENT_NEXT;
+
+               /* Only visit the first extent in each extent block */
+               if (extent.e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT)
+                       continue;
+               errcode = ext2fs_extent_replace(handle, 0, &extent);
+               if (errcode)
+                       break;
+       }
+
+       /* Ok if we run off the end */
+       if (errcode == EXT2_ET_EXTENT_NO_NEXT)
+               errcode = 0;
+       return errcode;
+}
+
 /*
  * Forcibly set checksums in all inodes.
  */
@@ -416,6 +458,13 @@ static void rewrite_inodes(ext2_filsys fs)
                        com_err("set_csum", retval, "while writing inode");
                        exit(1);
                }
+
+               retval = rewrite_extents(fs, ino, inode);
+               if (retval) {
+                       com_err("rewrite_extents", retval,
+                               "while rewriting extents");
+                       exit(1);
+               }
        } while (ino);
 
        ext2fs_free_mem(&inode);