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Subject[PATCH 1/9] writeback: Move clearing of I_SYNC into inode_sync_complete()
Date
Move clearing of I_SYNC into inode_sync_complete().  It is more logical to have
clearing of I_SYNC bit and waking of waiters in one place. Also later we will
have two places needing to clear I_SYNC and wake up waiters so this allows them
to use the common helper. Moving of I_SYNC clearing to a later stage of
writeback_single_inode() is safe since we hold i_lock all the time.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/fs-writeback.c | 8 ++------
1 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 539f36c..dd41437 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -231,11 +231,8 @@ static void requeue_io(struct inode *inode, struct bdi_writeback *wb)

static void inode_sync_complete(struct inode *inode)
{
- /*
- * Prevent speculative execution through
- * spin_unlock(&wb->list_lock);
- */
-
+ inode->i_state &= ~I_SYNC;
+ /* Waiters must see I_SYNC cleared before being woken up */
smp_mb();
wake_up_bit(&inode->i_state, __I_SYNC);
}
@@ -436,7 +433,6 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,

spin_lock(&wb->list_lock);
spin_lock(&inode->i_lock);
- inode->i_state &= ~I_SYNC;
if (!(inode->i_state & I_FREEING)) {
/*
* Sync livelock prevention. Each inode is tagged and synced in
--
1.7.1


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