NFS: Allow the mount option retrans=0
We should allow retrans=0 as just meaning that every timeout is a major
timeout, and that there is no increment in the timeout value.
For instance, this means that we would allow TCP users to specify a
flat timeout value of 60s, by specifying "timeo=600,retrans=0" in their
mount option string.
Siged-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 18d446e..d396013 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -923,6 +923,8 @@
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data) {
+ data->timeo = NFS_UNSPEC_TIMEO;
+ data->retrans = NFS_UNSPEC_RETRANS;
data->acregmin = NFS_DEF_ACREGMIN;
data->acregmax = NFS_DEF_ACREGMAX;
data->acdirmin = NFS_DEF_ACDIRMIN;
@@ -1189,6 +1191,19 @@
return rc;
}
+static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
+ unsigned long l_bound, unsigned long u_bound)
+{
+ int ret;
+
+ ret = nfs_get_option_ul(args, option);
+ if (ret != 0)
+ return ret;
+ if (*option < l_bound || *option > u_bound)
+ return -ERANGE;
+ return 0;
+}
+
/*
* Error-check and convert a string of mount options from user space into
* a data structure. The whole mount string is processed; bad options are
@@ -1352,12 +1367,12 @@
mnt->bsize = option;
break;
case Opt_timeo:
- if (nfs_get_option_ul(args, &option) || option == 0)
+ if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
goto out_invalid_value;
mnt->timeo = option;
break;
case Opt_retrans:
- if (nfs_get_option_ul(args, &option) || option == 0)
+ if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
goto out_invalid_value;
mnt->retrans = option;
break;