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Btrfs: fix balancing oops when invalidate_inode_pages2 returns EBUSY 

invalidate_inode_pages2_range may return -EBUSY occasionally
which results Oops. This patch fixes the issue by moving
invalidate_inode_pages2_range into a loop and keeping calling
it until the return value is not -EBUSY.

The EBUSY return is temporary, and can happen when the btrfs release page
function is unable to release a page because the EXTENT_LOCK
bit is set.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan Zheng 2009-08-07 13:51:33 -04:00 committed by Chris Mason
parent 60f2e8f8a0
commit ceab36edd3
1 changed files with 7 additions and 2 deletions
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9
fs/btrfs/relocation.c
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@ -2553,8 +2553,13 @@ int relocate_inode_pages(struct inode *inode, u64 start, u64 len)
last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
/* make sure the dirty trick played by the caller work */
ret = invalidate_inode_pages2_range(inode->i_mapping,
first_index, last_index);
while (1) {
ret = invalidate_inode_pages2_range(inode->i_mapping,
first_index, last_index);
if (ret != -EBUSY)
break;
schedule_timeout(HZ/10);
}
if (ret)
goto out_unlock;