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ceph: don't use truncate_pagecache() to invalidate read cache

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truncate_pagecache() drops dirty pages, it's dangerous to use it
to invalidate read cache. Besides, we shouldn't start invalidating
read cache while there are buffer writers. Because buffer writers
may add dirty pages later.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2016-05-18 20:58:26 +08:00
committed by Ilya Dryomov
parent b109eec6f4
commit 9abd4db713
2 changed files with 7 additions and 5 deletions
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4
fs/ceph/inode.c
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@@ -1728,7 +1728,9 @@ static void ceph_invalidate_work(struct work_struct *work)
orig_gen = ci->i_rdcache_gen;
spin_unlock(&ci->i_ceph_lock);
truncate_pagecache(inode, 0);
if (invalidate_inode_pages2(inode->i_mapping) < 0) {
pr_err("invalidate_pages %p fails\n", inode);
}
spin_lock(&ci->i_ceph_lock);
if (orig_gen == ci->i_rdcache_gen &&