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Diffstat (limited to 'fs/afs/dynroot.c')
-rw-r--r--fs/afs/dynroot.c31
1 files changed, 17 insertions, 14 deletions
diff --git a/fs/afs/dynroot.c b/fs/afs/dynroot.c
index 1fa8cf23bd36..1f656005018e 100644
--- a/fs/afs/dynroot.c
+++ b/fs/afs/dynroot.c
@@ -114,6 +114,7 @@ static int afs_probe_cell_name(struct dentry *dentry)
struct afs_net *net = afs_d2net(dentry);
const char *name = dentry->d_name.name;
size_t len = dentry->d_name.len;
+ char *result = NULL;
int ret;
/* Names prefixed with a dot are R/W mounts. */
@@ -131,9 +132,22 @@ static int afs_probe_cell_name(struct dentry *dentry)
}
ret = dns_query(net->net, "afsdb", name, len, "srv=1",
- NULL, NULL, false);
- if (ret == -ENODATA || ret == -ENOKEY)
+ &result, NULL, false);
+ if (ret == -ENODATA || ret == -ENOKEY || ret == 0)
ret = -ENOENT;
+ if (ret > 0 && ret >= sizeof(struct dns_server_list_v1_header)) {
+ struct dns_server_list_v1_header *v1 = (void *)result;
+
+ if (v1->hdr.zero == 0 &&
+ v1->hdr.content == DNS_PAYLOAD_IS_SERVER_LIST &&
+ v1->hdr.version == 1 &&
+ (v1->status != DNS_LOOKUP_GOOD &&
+ v1->status != DNS_LOOKUP_GOOD_WITH_BAD))
+ return -ENOENT;
+
+ }
+
+ kfree(result);
return ret;
}
@@ -252,20 +266,9 @@ static int afs_dynroot_d_revalidate(struct dentry *dentry, unsigned int flags)
return 1;
}
-/*
- * Allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
- * sleep)
- * - called from dput() when d_count is going to 0.
- * - return 1 to request dentry be unhashed, 0 otherwise
- */
-static int afs_dynroot_d_delete(const struct dentry *dentry)
-{
- return d_really_is_positive(dentry);
-}
-
const struct dentry_operations afs_dynroot_dentry_operations = {
.d_revalidate = afs_dynroot_d_revalidate,
- .d_delete = afs_dynroot_d_delete,
+ .d_delete = always_delete_dentry,
.d_release = afs_d_release,
.d_automount = afs_d_automount,
};