Bug #24730: Client::_invalidate_kernel_dcache causes NFS lookup “deleted” dentry - CephFS - Ceph

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Bug #24730

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Client::_invalidate_kernel_dcache causes NFS lookup “deleted” dentry

Added by shawn wu almost 6 years ago. Updated almost 6 years ago.

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Duplicate

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Normal

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3 - minor

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Description

We exported an NFS directory via a mounted ceph-fuse directory named "testshawn", and then started a write/read task using VDBENCH. During the task, the single active MDS was stopped manually. The fuse client connected to a new active MDS successfully, which was standby previously. However, the NFS client hang as well as IO became 0 after the NFS log showed it lookuped the manipulated directory dentry with “deleted”.

There were only 2 dentries in the cache displayed in the fuse client log after reconnection. Also, the log showed client “ll_lookup” the used directory dentry with “deleted” all the time. We found the Client::_invalidate_kernel_dcache would disable the dentries in dcache when reconnect. If entered the mounted fuse directory and did an ”ls” operation, or restarted the nfsd/nfs-mountd daemon, IO would resume.

The version of CEPH environment is v10.2.10 and OS is centos 7.2 of which kernel version is 3.10.0-693.

Files

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var_log_message.log (4.67 KB) var_log_message.log		shawn wu, 07/02/2018 12:49 PM
ceph-client.admin_reconnect_and_trim_cache.log (316 KB) ceph-client.admin_reconnect_and_trim_cache.log		shawn wu, 07/02/2018 12:50 PM
ceph-client.admin_lookup_deleted_dentry_appeared_and_hang.log.zip (50.2 KB) ceph-client.admin_lookup_deleted_dentry_appeared_and_hang.log.zip		shawn wu, 07/02/2018 12:50 PM