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authorSage Weil <sage@newdream.net>2010-06-22 01:12:26 +0200
committerSage Weil <sage@newdream.net>2010-06-22 01:11:50 +0200
commit17c688c3dfffc274c87be00033da0050bb6eefc0 (patch)
tree1b1586253abf6850c9746235462d71e14e57f243 /sound/atmel
parentceph: handle splice_dentry/d_materialize_unique error in readdir_prepopulate (diff)
downloadlinux-17c688c3dfffc274c87be00033da0050bb6eefc0.tar.xz
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ceph: delay umount until all mds requests drop inode+dentry refs
This fixes a race between handle_reply finishing an mds request, signalling completion, and then dropping the request structing and its dentry+inode refs, and pre_umount function waiting for requests to finish before letting the vfs tear down the dcache. If umount was delayed waiting for mds requests, we could race and BUG in shrink_dcache_for_umount_subtree because of a slow dput. This delays umount until the msgr queue flushes, which means handle_reply will exit and will have dropped the ceph_mds_request struct. I'm assuming the VFS has already ensured that its calls have all completed and those request refs have thus been dropped as well (I haven't seen that race, at least). Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'sound/atmel')
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