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A fix for an issue with ->d_revalidate() in ceph, causing frequent

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kernel crashes.  Marked for stable - it goes back to 4.6, but started
 popping up only in 4.8.
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Merge tag 'ceph-for-4.9-rc9' of git://github.com/ceph/ceph-client

Pull ceph fix from Ilya Dryomov:
 "A fix for an issue with ->d_revalidate() in ceph, causing frequent
  kernel crashes.

  Marked for stable - it goes back to 4.6, but started popping up only
  in 4.8"

* tag 'ceph-for-4.9-rc9' of git://github.com/ceph/ceph-client:
  ceph: don't set req->r_locked_dir in ceph_d_revalidate
This commit is contained in:
Linus Torvalds 2016-12-09 11:02:40 -08:00
commit af9468db44
1 changed files with 14 additions and 10 deletions
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24
fs/ceph/dir.c
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@ -1261,26 +1261,30 @@ static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
return -ECHILD;
op = ceph_snap(dir) == CEPH_SNAPDIR ?
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_GETATTR;
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
if (!IS_ERR(req)) {
req->r_dentry = dget(dentry);
req->r_num_caps = 2;
req->r_num_caps = op == CEPH_MDS_OP_GETATTR ? 1 : 2;
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
if (ceph_security_xattr_wanted(dir))
mask |= CEPH_CAP_XATTR_SHARED;
req->r_args.getattr.mask = mask;
req->r_locked_dir = dir;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (err == 0 || err == -ENOENT) {
if (dentry == req->r_dentry) {
valid = !d_unhashed(dentry);
} else {
d_invalidate(req->r_dentry);
err = -EAGAIN;
}
switch (err) {
case 0:
if (d_really_is_positive(dentry) &&
d_inode(dentry) == req->r_target_inode)
valid = 1;
break;
case -ENOENT:
if (d_really_is_negative(dentry))
valid = 1;
/* Fallthrough */
default:
break;
}
ceph_mdsc_put_request(req);
dout("d_revalidate %p lookup result=%d\n",