[PATCH 6/7] Zero write-cache superblock in --zero-super
From: Song Liu <hidden>
Date: 2015-05-14 06:43:55
Subsystem:
the rest · Maintainer:
Linus Torvalds
Signed-off-by: Song Liu <redacted> --- Kill.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/Kill.c b/Kill.c
index f2fdb85..9dc566b 100644
--- a/Kill.c
+++ b/Kill.c@@ -29,6 +29,18 @@ #include "md_u.h" #include "md_p.h" +int KillR5LSuper(struct supertype *st, int fd) +{ + memset(st->r5l_sb, 0, LOG_BLOCK_SIZE); + + if (lseek64(fd, 512 * (st->data_offset), 0) < 0LL) + return 1; + if (write(fd, st->r5l_sb, LOG_BLOCK_SIZE)) + return 1; + fsync(fd); + return 0; +} + int Kill(char *dev, struct supertype *st, int force, int verbose, int noexcl) { /*
@@ -60,8 +72,15 @@ int Kill(char *dev, struct supertype *st, int force, int verbose, int noexcl) return 2; } st->ignore_hw_compat = 1; + st->data_offset = INVALID_SECTORS; /* load st->data_offset from sb for KillR5LSuper */ rv = st->ss->load_super(st, fd, dev); if (rv == 0 || (force && rv >= 2)) { + if (st->r5l_sb) { + if (verbose > 0) + pr_err("zero write_cache superblock\n"); + KillR5LSuper(st, fd); + } + st->ss->free_super(st); st->ss->init_super(st, NULL, 0, "", NULL, NULL, INVALID_SECTORS);
--
1.8.1