linux-ext4 - [PATCH 3/4] ext4: endless truncate due to nonlocked dio readers V2

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Message-Id: <1346780214-29845-3-git-send-email-dmonakhov@openvz.org>
Date:	Tue,  4 Sep 2012 21:36:53 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-ext4@...r.kernel.org
Cc:	jack@...e.cz, Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 3/4] ext4: endless truncate due to nonlocked dio readers V2

If we have enough aggressive DIO readers, truncate will wait
forever inside inode_dio_wait(). It is reasonable to disable
nonlock DIO read optimization during truncate.

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext4/inode.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 709ec5a..5a75908 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4354,7 +4354,9 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 	if (attr->ia_valid & ATTR_SIZE) {
 		if (attr->ia_size != i_size_read(inode))
 			truncate_setsize(inode, attr->ia_size);
+		ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
 		inode_dio_wait(inode);
+		ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
 		ext4_truncate(inode);
 	}
 
-- 
1.7.7.6

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