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| author |   Miklos Szeredi <mszeredi@suse.cz> | 2013-09-05 11:44:36 +0200 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2013-09-05 16:23:41 -0400 |
| commit | 848ac114e847af3f1f9141c90a39ebe79bdb13b3 (patch) | |
| tree | 3673b97171b0e0bc5b179908b4ad15ede9a91b35 /fs/internal.h | |
| parent | vfs: add d_walk() (diff) | |
| download | linux-dev-848ac114e847af3f1f9141c90a39ebe79bdb13b3.tar.xz linux-dev-848ac114e847af3f1f9141c90a39ebe79bdb13b3.zip | |
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 <mszeredi@suse.cz>
CC: David Howells <dhowells@redhat.com>
CC: Steven Whitehouse <swhiteho@redhat.com>
CC: Trond Myklebust <Trond.Myklebust@netapp.com>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/internal.h')
0 files changed, 0 insertions, 0 deletions