704cd0758a
Linux 4.0 introduces lazytime. The idea is that when we update the atime, we delay writing it to disk for as long as it is reasonably possible. When lazytime is enabled, dirty_inode will be called with only I_DIRTY_TIME flag whenever i_atime is updated. So under such condition, we will set z_atime_dirty. We will only write it to disk if file is closed, inode is evicted or setattr is called. Ideally, we should also write it whenever SA is going to be updated, but it is left for future improvement. There's one thing that we should take care of now that we allow i_atime to be dirty. In original implementation, whenever SA is modified, zfs_inode_update will be called to overwrite every thing in inode. This will cause dirty i_atime to be discarded. We fix this by don't overwrite i_atime in zfs_inode_update. We only overwrite i_atime when allocating new inode or doing zfs_rezget with zfs_inode_update_new. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #4482 |
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