Discard all snapshots by 'tune2fs -O ^has_snapshot'.
Snapshot inodes are chained on a list starting at the super block.
Delete all snapshot inodes and reset exclude bitmap.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxxxxx>
---
misc/tune2fs.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 68 insertions(+), 0 deletions(-)
diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 70852bd..e3fcd0f 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -313,6 +313,61 @@ static void remove_special_inode(ext2_filsys fs, ext2_ino_t ino,
}
/*
+ * Discard snapshots list (free all snapshot blocks)
+ */
+static void discard_snapshot_list(ext2_filsys fs)
+{
+ struct ext2_super_block *sb = fs->super;
+ struct ext2_inode inode;
+ ext2_ino_t ino = sb->s_snapshot_list;
+ errcode_t retval;
+ int i = 0;
+
+ if (!ino)
+ /* no snapshot list, but maybe active snapshot exists? */
+ ino = sb->s_snapshot_inum;
+ if (ino)
+ fputs(_("Discarding snapshots: "), stderr);
+
+ while (ino) {
+ retval = ext2fs_read_inode(fs, ino, &inode);
+ if (retval) {
+ com_err(program_name, retval,
+ _("while reading snapshot inode %u"),
+ ino);
+ exit(1);
+ }
+
+ remove_special_inode(fs, ino, &inode, 1);
+
+ retval = ext2fs_write_inode(fs, ino, &inode);
+ if (retval) {
+ com_err(program_name, retval,
+ _("while writing snapshot inode %u"),
+ ino);
+ exit(1);
+ }
+
+ fprintf(stderr, _("%u,"), inode.i_generation);
+ ino = inode.i_next_snapshot;
+ i++;
+ }
+
+ if (i > 0) {
+ sb->s_snapshot_inum = 0;
+ sb->s_snapshot_id = 0;
+ sb->s_snapshot_r_blocks_count = 0;
+ sb->s_snapshot_list = 0;
+ fputs(_("done\n"), stderr);
+ }
+
+ /* no snapshots, so no snapshot problems to fix */
+ sb->s_feature_ro_compat &= ~NEXT3_FEATURE_RO_COMPAT_FIX_SNAPSHOT;
+ fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
+ ext2fs_mark_super_dirty(fs);
+}
+
+/*
* Remove the exclude inode from the filesystem
*/
static void remove_exclude_inode(ext2_filsys fs)
@@ -551,6 +606,19 @@ static void update_feature_set(ext2_filsys fs, char *features)
}
}
+ if (FEATURE_OFF_SAFE(E2P_FEATURE_RO_INCOMPAT,
+ NEXT3_FEATURE_RO_COMPAT_HAS_SNAPSHOT)) {
+ discard_snapshot_list(fs);
+ if (sb->s_feature_compat &
+ NEXT3_FEATURE_COMPAT_EXCLUDE_INODE) {
+ /* reset exclude bitmap blocks */
+ retval = ext2fs_create_exclude_inode(fs, 1);
+ if (retval)
+ sb->s_feature_compat &=
+ ~NEXT3_FEATURE_COMPAT_EXCLUDE_INODE;
+ }
+ }
+
if (FEATURE_ON_SAFE(E2P_FEATURE_RO_INCOMPAT,
NEXT3_FEATURE_RO_COMPAT_HAS_SNAPSHOT)) {
if ((sb->s_feature_compat &
--
1.6.6
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
