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vfs: fix propagation of atomic_open create error on negative dentry 

If ->atomic_open() returns -ENOENT, we take care to return the create
error (e.g., EACCES), if any.  Do the same when ->atomic_open() returns 1
and provides a negative dentry.

This fixes a regression where an unprivileged open O_CREAT fails with
ENOENT instead of EACCES, introduced with the new atomic_open code.  It
is tested by the open/08.t test in the pjd posix test suite, and was
observed on top of fuse (backed by ceph-fuse).

Signed-off-by: Sage Weil <sage@inktank.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Sage Weil 2012-08-15 13:30:12 -07:00 committed by Miklos Szeredi
parent af109bca94
commit 62b2ce964b
1 changed files with 4 additions and 0 deletions
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4
fs/namei.c
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@ -2489,6 +2489,10 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
dput(dentry);
dentry = file->f_path.dentry;
}
if (create_error && dentry->d_inode == NULL) {
error = create_error;
goto out;
}
goto looked_up;
}