Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=94d6351e147231b2c5a9512d69693ee8ac0c204d
Commit: 94d6351e147231b2c5a9512d69693ee8ac0c204d
Parent: 73d410c0137f63c6597e9763c81e5f4d015e9940
Author: Milan Broz <[EMAIL PROTECTED]>
AuthorDate: Fri Feb 8 02:10:27 2008 +0000
Committer: Alasdair G Kergon <[EMAIL PROTECTED]>
CommitDate: Fri Feb 8 02:10:27 2008 +0000
dm: split dm_suspend io_lock hold into two
Change io_locking to allow processing flush in separate thread.
Because we have DMF_BLOCK_IO already set, any possible
new ios are queued in dm_requests now.
In the case of interrupting previous wait there can be more
ios queued (we unlocked io_lock for a while) but this is safe.
Signed-off-by: Milan Broz <[EMAIL PROTECTED]>
Signed-off-by: Alasdair G Kergon <[EMAIL PROTECTED]>
---
drivers/md/dm.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 5191954..11f422e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1434,9 +1434,11 @@ int dm_suspend(struct mapped_device *md, unsigned
suspend_flags)
if (noflush)
__merge_pushback_list(md);
+ up_write(&md->io_lock);
/* were we interrupted ? */
if (pending) {
+ down_write(&md->io_lock);
__flush_deferred_io(md);
up_write(&md->io_lock);
@@ -1444,7 +1446,6 @@ int dm_suspend(struct mapped_device *md, unsigned
suspend_flags)
r = -EINTR;
goto out; /* pushback list is already flushed, so skip flush */
}
- up_write(&md->io_lock);
dm_table_postsuspend_targets(map);
-
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