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nfsd: ensure that st_access_bmap and st_deny_bmap are initialized to 0

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Open stateids must be initialized with the st_access_bmap and
st_deny_bmap set to 0, so that nfs4_get_vfs_file can properly record
their state in old_access_bmap and old_deny_bmap.

This bug was introduced in commit baeb4ff0e5 (nfsd: make deny mode
enforcement more efficient and close races in it) and was causing the
refcounts to end up incorrect when nfs4_get_vfs_file returned an error
after bumping the refcounts. This made it impossible to unmount the
underlying filesystem after running pynfs tests that involve deny modes.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2014-07-23 13:46:49 -04:00 committed by J. Bruce Fields
parent e560e3b510
commit 2f6ce8e73c
1 changed files with 0 additions and 2 deletions
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2
fs/nfsd/nfs4state.c
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@ -2970,8 +2970,6 @@ static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
stp->st_file = fp;
stp->st_access_bmap = 0;
stp->st_deny_bmap = 0;
set_access(open->op_share_access, stp);
set_deny(open->op_share_deny, stp);
stp->st_openstp = NULL;
spin_lock(&fp->fi_lock);
list_add(&stp->st_perfile, &fp->fi_stateids);