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vfs: check submounts and drop atomically
We check submounts before doing d_drop() on a non-empty directory dentry in NFS (have_submounts()), but we do not exclude a racing mount. Process A: have_submounts() -> returns false Process B: mount() -> success Process A: d_drop() This patch prepares the ground for the fix by doing the following operations all under the same rename lock: have_submounts() shrink_dcache_parent() d_drop() This is actually an optimization since have_submounts() and shrink_dcache_parent() both traverse the same dentry tree separately. Signed-off-by: Miklos Szeredi <[email protected]> CC: David Howells <[email protected]> CC: Steven Whitehouse <[email protected]> CC: Trond Myklebust <[email protected]> CC: Greg Kroah-Hartman <[email protected]> Signed-off-by: Al Viro <[email protected]>
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Miklos Szeredi
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Al Viro
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Sep 5, 2013
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