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authorNeilBrown <neilb@suse.de>2010-08-30 17:33:34 +1000
committerNeilBrown <neilb@suse.de>2010-08-30 18:06:21 +1000
commit070dc6dd7103b6b3f7e4d46e754354a5c15f366e (patch)
tree173e72d08b2070d496c203a6d5156b9a2ad2808c
parentbd52b746262c8d77e73903d6608014fb2fcdcd9d (diff)
downloadop-kernel-dev-070dc6dd7103b6b3f7e4d46e754354a5c15f366e.zip
op-kernel-dev-070dc6dd7103b6b3f7e4d46e754354a5c15f366e.tar.gz
md: resolve confusion of MD_CHANGE_CLEAN
MD_CHANGE_CLEAN is used for two different purposes and this leads to confusion. One of the purposes is largely mirrored by MD_CHANGE_PENDING which is not used for anything else, so have MD_CHANGE_PENDING take over that purpose fully. The two purposes are: 1/ tell md_update_sb that an update is needed and that it is just a clean/dirty transition. 2/ tell user-space that an transition from clean to dirty is pending (something wants to write), and tell te kernel (by clearin the flag) that the transition is OK. The first purpose remains wit MD_CHANGE_CLEAN, the second is moved fully to MD_CHANGE_PENDING. This means that various places which conditionally set or cleared MD_CHANGE_CLEAN no longer need to be conditional. Signed-off-by: NeilBrown <neilb@suse.de>
-rw-r--r--drivers/md/bitmap.c3
-rw-r--r--drivers/md/md.c24
-rw-r--r--drivers/md/md.h2
3 files changed, 11 insertions, 18 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 1ba1e12..ed4900a 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1542,8 +1542,7 @@ void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector)
atomic_read(&bitmap->mddev->recovery_active) == 0);
bitmap->mddev->curr_resync_completed = bitmap->mddev->curr_resync;
- if (bitmap->mddev->persistent)
- set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags);
+ set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags);
sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1);
s = 0;
while (s < sector && s < bitmap->mddev->resync_max_sectors) {
diff --git a/drivers/md/md.c b/drivers/md/md.c
index a1f6b59..43cf9cc 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2168,8 +2168,7 @@ repeat:
}
if (!mddev->persistent) {
- if (!mddev->external)
- clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
clear_bit(MD_CHANGE_DEVS, &mddev->flags);
wake_up(&mddev->sb_wait);
return;
@@ -2179,7 +2178,6 @@ repeat:
mddev->utime = get_seconds();
- set_bit(MD_CHANGE_PENDING, &mddev->flags);
if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
force_change = 1;
if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
@@ -3372,7 +3370,7 @@ array_state_show(mddev_t *mddev, char *page)
case 0:
if (mddev->in_sync)
st = clean;
- else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
+ else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
st = write_pending;
else if (mddev->safemode)
st = active_idle;
@@ -3453,9 +3451,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
mddev->in_sync = 1;
if (mddev->safemode == 1)
mddev->safemode = 0;
- if (mddev->persistent)
- set_bit(MD_CHANGE_CLEAN,
- &mddev->flags);
+ set_bit(MD_CHANGE_CLEAN, &mddev->flags);
}
err = 0;
} else
@@ -3467,8 +3463,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
case active:
if (mddev->pers) {
restart_array(mddev);
- if (mddev->external)
- clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ clear_bit(MD_CHANGE_PENDING, &mddev->flags);
wake_up(&mddev->sb_wait);
err = 0;
} else {
@@ -6573,6 +6568,7 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
if (mddev->in_sync) {
mddev->in_sync = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ set_bit(MD_CHANGE_PENDING, &mddev->flags);
md_wakeup_thread(mddev->thread);
did_change = 1;
}
@@ -6581,7 +6577,6 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
if (did_change)
sysfs_notify_dirent_safe(mddev->sysfs_state);
wait_event(mddev->sb_wait,
- !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
!test_bit(MD_CHANGE_PENDING, &mddev->flags));
}
@@ -6617,6 +6612,7 @@ int md_allow_write(mddev_t *mddev)
if (mddev->in_sync) {
mddev->in_sync = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ set_bit(MD_CHANGE_PENDING, &mddev->flags);
if (mddev->safemode_delay &&
mddev->safemode == 0)
mddev->safemode = 1;
@@ -6626,7 +6622,7 @@ int md_allow_write(mddev_t *mddev)
} else
spin_unlock_irq(&mddev->write_lock);
- if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
+ if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
return -EAGAIN;
else
return 0;
@@ -6824,8 +6820,7 @@ void md_do_sync(mddev_t *mddev)
atomic_read(&mddev->recovery_active) == 0);
mddev->curr_resync_completed =
mddev->curr_resync;
- if (mddev->persistent)
- set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ set_bit(MD_CHANGE_CLEAN, &mddev->flags);
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}
@@ -7104,8 +7099,7 @@ void md_check_recovery(mddev_t *mddev)
mddev->recovery_cp == MaxSector) {
mddev->in_sync = 1;
did_change = 1;
- if (mddev->persistent)
- set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ set_bit(MD_CHANGE_CLEAN, &mddev->flags);
}
if (mddev->safemode == 1)
mddev->safemode = 0;
diff --git a/drivers/md/md.h b/drivers/md/md.h
index a953fe2..3931299 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -140,7 +140,7 @@ struct mddev_s
unsigned long flags;
#define MD_CHANGE_DEVS 0 /* Some device status has changed */
#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
-#define MD_CHANGE_PENDING 2 /* superblock update in progress */
+#define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */
int suspended;
atomic_t active_io;
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