[PATCH 006 of 10] md: Notify userspace on 'write-pending' changes to array_state
From: NeilBrown <hidden>
Date: 2008-05-19 01:12:45
Also in:
lkml
When an array enters write pending, 'array_state' changes, so we must be sure to sysfs_notify. Also, when waiting for user-space to acknowledge 'write-pending' by marking the metadata as dirty, we don't want to wait for MD_CHANGE_DEVS to be cleared as that might not happen. So explicity test for the bits that we are really interested in. Signed-off-by: Neil Brown <redacted> ### Diffstat output ./drivers/md/md.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c 2008-05-19 11:02:35.000000000 +1000
+++ ./drivers/md/md.c 2008-05-19 11:03:43.000000000 +1000@@ -5435,8 +5435,11 @@ void md_write_start(mddev_t *mddev, stru md_wakeup_thread(mddev->thread); } spin_unlock_irq(&mddev->write_lock); + sysfs_notify(&mddev->kobj, NULL, "array_state"); } - wait_event(mddev->sb_wait, mddev->flags==0); + wait_event(mddev->sb_wait, + !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && + !test_bit(MD_CHANGE_PENDING, &mddev->flags)); } void md_write_end(mddev_t *mddev)
@@ -5471,6 +5474,12 @@ void md_allow_write(mddev_t *mddev) mddev->safemode = 1; spin_unlock_irq(&mddev->write_lock); md_update_sb(mddev, 0); + + sysfs_notify(&mddev->kobj, NULL, "array_state"); + /* wait for the dirty state to be recorded in the metadata */ + wait_event(mddev->sb_wait, + !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && + !test_bit(MD_CHANGE_PENDING, &mddev->flags)); } else spin_unlock_irq(&mddev->write_lock); }