[PATCH v3 3/4] md: sync blockdev before stopping raid or setting readonly
From: <hidden>
Date: 2024-01-25 06:32:44
Also in:
lkml
Subsystem:
software raid (multiple disks) support, the rest · Maintainers:
Song Liu, Yu Kuai, Linus Torvalds
From: Li Nan <redacted>
Commit a05b7ea03d72 ("md: avoid crash when stopping md array races
with closing other open fds.") added sync_block before stopping raid and
setting readonly. Later in commit 260fa034ef7a ("md: avoid deadlock when
dirty buffers during md_stop.") it is moved to ioctl. array_state_store()
was ignored. Add sync blockdev to array_state_store() now.
Signed-off-by: Li Nan <redacted>
---
drivers/md/md.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 40ab5c7ce394..3f1c9a264c8a 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c@@ -4478,6 +4478,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) { int err = 0; enum array_state st = match_word(buf, array_states); + bool clear_md_closing = false; /* No lock dependent actions */ switch (st) {
@@ -4487,6 +4488,16 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) case broken: /* cannot be set */ case bad_word: return -EINVAL; + case clear: + case readonly: + case inactive: + case read_auto: + if (!mddev->pers || !md_is_rdwr(mddev)) + break; + err = mddev_set_closing_and_sync_blockdev(mddev); + if (err) + return err; + clear_md_closing = true; default: break; }
@@ -4512,6 +4523,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) spin_unlock(&mddev->lock); return err ?: len; } + err = mddev_lock(mddev); if (err) return err;
@@ -4524,6 +4536,8 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) break; case clear: err = do_md_stop(mddev, 0, NULL); + if (!err) + clear_md_closing = false; break; case readonly: if (mddev->pers)
@@ -4586,6 +4600,10 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) sysfs_notify_dirent_safe(mddev->sysfs_state); } mddev_unlock(mddev); + + if (clear_md_closing) + clear_bit(MD_CLOSING, &mddev->flags); + return err ?: len; } static struct md_sysfs_entry md_array_state =
--
2.39.2