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NFSv4: Send unmapped uid/gids to the server when using auth_sys
The new behaviour is enabled using the new module parameter 'nfs4_disable_idmapping'. Note that if the server rejects an unmapped uid or gid, then the client will automatically switch back to using the idmapper. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -1580,6 +1580,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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of returning the full 64-bit number.
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The default is to return 64-bit inode numbers.
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nfs.nfs4_disable_idmapping=
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[NFSv4] When set, this option disables the NFSv4
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idmapper on the client, but only if the mount
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is using the 'sec=sys' security flavour. This may
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make migration from legacy NFSv2/v3 systems easier
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provided that the server has the appropriate support.
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The default is to always enable NFSv4 idmapping.
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nmi_debug= [KNL,AVR32,SH] Specify one or more actions to take
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when a NMI is triggered.
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Format: [state][,regs][,debounce][,die]
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@ -81,6 +81,11 @@ retry:
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}
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#endif /* CONFIG_NFS_V4 */
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/*
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* Turn off NFSv4 uid/gid mapping when using AUTH_SYS
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*/
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static int nfs4_disable_idmapping = 0;
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/*
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* RPC cruft for NFS
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*/
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@ -1567,6 +1572,13 @@ static int nfs4_init_server(struct nfs_server *server,
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if (error < 0)
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goto error;
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/*
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* Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
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* authentication.
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*/
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if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
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server->caps |= NFS_CAP_UIDGID_NOMAP;
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if (data->rsize)
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server->rsize = nfs_block_size(data->rsize, NULL);
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if (data->wsize)
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@ -1984,3 +1996,7 @@ void nfs_fs_proc_exit(void)
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}
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#endif /* CONFIG_PROC_FS */
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module_param(nfs4_disable_idmapping, bool, 0644);
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MODULE_PARM_DESC(nfs4_disable_idmapping,
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"Turn off NFSv4 idmapping when using 'sec=sys'");
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@ -61,6 +61,9 @@ static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
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#include <linux/slab.h>
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#include <linux/cred.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs_sb.h>
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#include <linux/nfs_idmap.h>
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#include <linux/keyctl.h>
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#include <linux/key-type.h>
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@ -257,17 +260,20 @@ int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size
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int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
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{
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int ret;
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ret = nfs_idmap_lookup_name(uid, "user", buf, buflen);
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int ret = -EINVAL;
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if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
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ret = nfs_idmap_lookup_name(uid, "user", buf, buflen);
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if (ret < 0)
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ret = nfs_map_numeric_to_string(uid, buf, buflen);
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return ret;
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}
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int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen)
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{
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int ret;
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int ret = -EINVAL;
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ret = nfs_idmap_lookup_name(gid, "group", buf, buflen);
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if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
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ret = nfs_idmap_lookup_name(gid, "group", buf, buflen);
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if (ret < 0)
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ret = nfs_map_numeric_to_string(gid, buf, buflen);
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return ret;
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@ -750,9 +756,10 @@ int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size
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int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
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{
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struct idmap *idmap = server->nfs_client->cl_idmap;
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int ret;
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int ret = -EINVAL;
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ret = nfs_idmap_name(idmap, &idmap->idmap_user_hash, uid, buf);
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if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
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ret = nfs_idmap_name(idmap, &idmap->idmap_user_hash, uid, buf);
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if (ret < 0)
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ret = nfs_map_numeric_to_string(uid, buf, buflen);
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return ret;
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@ -760,9 +767,10 @@ int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, s
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int nfs_map_gid_to_group(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
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{
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struct idmap *idmap = server->nfs_client->cl_idmap;
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int ret;
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int ret = -EINVAL;
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ret = nfs_idmap_name(idmap, &idmap->idmap_group_hash, uid, buf);
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if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
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ret = nfs_idmap_name(idmap, &idmap->idmap_group_hash, uid, buf);
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if (ret < 0)
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ret = nfs_map_numeric_to_string(uid, buf, buflen);
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return ret;
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@ -244,7 +244,7 @@ static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
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/* This is the error handling routine for processes that are allowed
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* to sleep.
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*/
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static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
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static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
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{
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struct nfs_client *clp = server->nfs_client;
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struct nfs4_state *state = exception->state;
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@ -296,6 +296,19 @@ static int nfs4_handle_exception(const struct nfs_server *server, int errorcode,
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break;
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case -NFS4ERR_OLD_STATEID:
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exception->retry = 1;
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break;
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case -NFS4ERR_BADOWNER:
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/* The following works around a Linux server bug! */
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case -NFS4ERR_BADNAME:
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if (server->caps & NFS_CAP_UIDGID_NOMAP) {
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server->caps &= ~NFS_CAP_UIDGID_NOMAP;
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exception->retry = 1;
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printk(KERN_WARNING "NFS: v4 server %s "
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"does not accept raw "
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"uid/gids. "
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"Reenabling the idmapper.\n",
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server->nfs_client->cl_hostname);
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}
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}
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/* We failed to handle the error */
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return nfs4_map_errors(ret);
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@ -177,6 +177,7 @@ struct nfs_server {
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#define NFS_CAP_CTIME (1U << 12)
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#define NFS_CAP_MTIME (1U << 13)
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#define NFS_CAP_POSIX_LOCK (1U << 14)
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#define NFS_CAP_UIDGID_NOMAP (1U << 15)
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/* maximum number of slots to use */
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