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Message-ID: <149745353411.10897.420622216132883178.stgit@warthog.procyon.org.uk>
Date: Wed, 14 Jun 2017 16:18:54 +0100
From: David Howells <dhowells@...hat.com>
To: mszeredi@...hat.com, viro@...iv.linux.org.uk
Cc: linux-nfs@...r.kernel.org, jlayton@...hat.com,
linux-kernel@...r.kernel.org, dhowells@...hat.com,
linux-security-module@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Subject: [PATCH 24/27] NFS: Add fs_context support. [ver #5]
Add filesystem context support to NFS, parsing the options in advance and
attaching the information to struct nfs_fs_context. The highlights are:
(*) Merge nfs_mount_info and nfs_clone_mount into nfs_fs_context. This
structure represents NFS's superblock config.
(*) Make use of the VFS's parsing support to split comma-separated lists.
(*) Pin the NFS protocol module in the nfs_fs_context.
(*) Attach supplementary error information to fs_context. This has the
downside that these strings must be static and can't be formatted.
(*) Remove the auxiliary file_system_type structs since the information
necessary can be conveyed in the nfs_fs_context struct instead.
(*) Root mounts are made by duplicating the config for the requested mount
so as to have the same parameters. Submounts pick up their parameters
from the parent superblock.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/nfs/client.c | 74 +++--
fs/nfs/fs_context.c | 652 ++++++++++++++++++++++++++++-------------------
fs/nfs/getroot.c | 72 +++--
fs/nfs/internal.h | 104 +++----
fs/nfs/namespace.c | 76 ++++-
fs/nfs/nfs3_fs.h | 2
fs/nfs/nfs3client.c | 6
fs/nfs/nfs3proc.c | 2
fs/nfs/nfs4_fs.h | 4
fs/nfs/nfs4client.c | 44 ++-
fs/nfs/nfs4namespace.c | 208 +++++++++------
fs/nfs/nfs4proc.c | 3
fs/nfs/nfs4super.c | 220 ++++++++--------
fs/nfs/proc.c | 2
fs/nfs/super.c | 381 ++++++++-------------------
include/linux/nfs_xdr.h | 7 -
16 files changed, 940 insertions(+), 917 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d25dfa15f2ec..8c9b610ca952 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -635,25 +635,24 @@ EXPORT_SYMBOL_GPL(nfs_init_client);
* Create a version 2 or 3 client
*/
static int nfs_init_server(struct nfs_server *server,
- const struct nfs_fs_context *cfg,
- struct nfs_subversion *nfs_mod)
+ const struct nfs_fs_context *ctx)
{
struct rpc_timeout timeparms;
struct nfs_client_initdata cl_init = {
- .hostname = cfg->nfs_server.hostname,
- .addr = (const struct sockaddr *)&cfg->nfs_server.address,
- .addrlen = cfg->nfs_server.addrlen,
- .nfs_mod = nfs_mod,
- .proto = cfg->nfs_server.protocol,
- .net = cfg->net,
+ .hostname = ctx->nfs_server.hostname,
+ .addr = (const struct sockaddr *)&ctx->nfs_server.address,
+ .addrlen = ctx->nfs_server.addrlen,
+ .nfs_mod = ctx->nfs_mod,
+ .proto = ctx->nfs_server.protocol,
+ .net = ctx->fc.net_ns,
.timeparms = &timeparms,
};
struct nfs_client *clp;
int error;
- nfs_init_timeout_values(&timeparms, cfg->nfs_server.protocol,
- cfg->timeo, cfg->retrans);
- if (cfg->flags & NFS_MOUNT_NORESVPORT)
+ nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
+ ctx->timeo, ctx->retrans);
+ if (ctx->flags & NFS_MOUNT_NORESVPORT)
set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
/* Allocate or find a client reference we can use */
@@ -664,46 +663,46 @@ static int nfs_init_server(struct nfs_server *server,
server->nfs_client = clp;
/* Initialise the client representation from the mount data */
- server->flags = cfg->flags;
- server->options = cfg->options;
+ server->flags = ctx->flags;
+ server->options = ctx->options;
server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
- if (cfg->rsize)
- server->rsize = nfs_block_size(cfg->rsize, NULL);
- if (cfg->wsize)
- server->wsize = nfs_block_size(cfg->wsize, NULL);
+ if (ctx->rsize)
+ server->rsize = nfs_block_size(ctx->rsize, NULL);
+ if (ctx->wsize)
+ server->wsize = nfs_block_size(ctx->wsize, NULL);
- server->acregmin = cfg->acregmin * HZ;
- server->acregmax = cfg->acregmax * HZ;
- server->acdirmin = cfg->acdirmin * HZ;
- server->acdirmax = cfg->acdirmax * HZ;
+ server->acregmin = ctx->acregmin * HZ;
+ server->acregmax = ctx->acregmax * HZ;
+ server->acdirmin = ctx->acdirmin * HZ;
+ server->acdirmax = ctx->acdirmax * HZ;
/* Start lockd here, before we might error out */
error = nfs_start_lockd(server);
if (error < 0)
goto error;
- server->port = cfg->nfs_server.port;
- server->auth_info = cfg->auth_info;
+ server->port = ctx->nfs_server.port;
+ server->auth_info = ctx->auth_info;
error = nfs_init_server_rpcclient(server, &timeparms,
- cfg->selected_flavor);
+ ctx->selected_flavor);
if (error < 0)
goto error;
/* Preserve the values of mount_server-related mount options */
- if (cfg->mount_server.addrlen) {
- memcpy(&server->mountd_address, &cfg->mount_server.address,
- cfg->mount_server.addrlen);
- server->mountd_addrlen = cfg->mount_server.addrlen;
+ if (ctx->mount_server.addrlen) {
+ memcpy(&server->mountd_address, &ctx->mount_server.address,
+ ctx->mount_server.addrlen);
+ server->mountd_addrlen = ctx->mount_server.addrlen;
}
- server->mountd_version = cfg->mount_server.version;
- server->mountd_port = cfg->mount_server.port;
- server->mountd_protocol = cfg->mount_server.protocol;
+ server->mountd_version = ctx->mount_server.version;
+ server->mountd_port = ctx->mount_server.port;
+ server->mountd_protocol = ctx->mount_server.protocol;
- server->namelen = cfg->namlen;
+ server->namelen = ctx->namlen;
return 0;
error:
@@ -921,8 +920,7 @@ EXPORT_SYMBOL_GPL(nfs_free_server);
* Create a version 2 or 3 volume record
* - keyed on server and FSID
*/
-struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct nfs_server *nfs_create_server(struct nfs_fs_context *ctx)
{
struct nfs_server *server;
struct nfs_fattr *fattr;
@@ -938,18 +936,18 @@ struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
goto error;
/* Get a client representation */
- error = nfs_init_server(server, mount_info->ctx, nfs_mod);
+ error = nfs_init_server(server, ctx);
if (error < 0)
goto error;
/* Probe the root fh to retrieve its FSID */
- error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
+ error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
if (error < 0)
goto error;
if (server->nfs_client->rpc_ops->version == 3) {
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
server->namelen = NFS3_MAXNAMLEN;
- if (!(mount_info->ctx->flags & NFS_MOUNT_NORDIRPLUS))
+ if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
server->caps |= NFS_CAP_READDIRPLUS;
} else {
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
@@ -957,7 +955,7 @@ struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
}
if (!(fattr->valid & NFS_ATTR_FATTR)) {
- error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
+ error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, fattr, NULL);
if (error < 0) {
dprintk("nfs_create_server: getattr error = %d\n", -error);
goto error;
diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index 24becb82540f..e8e88aaa5164 100644
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -240,42 +240,8 @@ static const match_table_t nfs_vers_tokens = {
{ Opt_vers_err, NULL }
};
-struct nfs_fs_context *nfs_alloc_parsed_mount_data(void)
-{
- struct nfs_fs_context *ctx;
-
- ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
- if (ctx) {
- ctx->timeo = NFS_UNSPEC_TIMEO;
- ctx->retrans = NFS_UNSPEC_RETRANS;
- ctx->acregmin = NFS_DEF_ACREGMIN;
- ctx->acregmax = NFS_DEF_ACREGMAX;
- ctx->acdirmin = NFS_DEF_ACDIRMIN;
- ctx->acdirmax = NFS_DEF_ACDIRMAX;
- ctx->mount_server.port = NFS_UNSPEC_PORT;
- ctx->nfs_server.port = NFS_UNSPEC_PORT;
- ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
- ctx->minorversion = 0;
- ctx->need_mount = true;
- ctx->net = current->nsproxy->net_ns;
- security_init_mnt_opts(&ctx->lsm_opts);
- }
- return ctx;
-}
-
-void nfs_free_parsed_mount_data(struct nfs_fs_context *ctx)
-{
- if (ctx) {
- kfree(ctx->client_address);
- kfree(ctx->mount_server.hostname);
- kfree(ctx->nfs_server.export_path);
- kfree(ctx->nfs_server.hostname);
- kfree(ctx->fscache_uniq);
- security_free_mnt_opts(&ctx->lsm_opts);
- kfree(ctx);
- }
-}
+const char nfs_slash[] = "/";
+EXPORT_SYMBOL_GPL(nfs_slash);
/*
* Sanity-check a server address provided by the mount command.
@@ -354,10 +320,8 @@ static int nfs_auth_info_add(struct nfs_fs_context *ctx,
return 0;
}
- if (auth_info->flavor_len + 1 >= max_flavor_len) {
- dfprintk(MOUNT, "NFS: too many sec= flavors\n");
- return -EINVAL;
- }
+ if (auth_info->flavor_len + 1 >= max_flavor_len)
+ return invalf("NFS: too many sec= flavors");
auth_info->flavors[auth_info->flavor_len++] = flavor;
return 0;
@@ -411,9 +375,7 @@ static int nfs_parse_security_flavors(struct nfs_fs_context *ctx, char *value)
pseudoflavor = RPC_AUTH_GSS_SPKMP;
break;
default:
- dfprintk(MOUNT,
- "NFS: sec= option '%s' not recognized\n", p);
- return -EINVAL;
+ return invalf("NFS: sec=%s option not recognized", p);
}
ret = nfs_auth_info_add(ctx, &ctx->auth_info, pseudoflavor);
@@ -457,8 +419,7 @@ static int nfs_parse_version_string(struct nfs_fs_context *ctx,
ctx->minorversion = 2;
break;
default:
- dfprintk(MOUNT, "NFS: Unsupported NFS version\n");
- return -EINVAL;
+ return invalf("NFS: Unsupported NFS version");
}
return 0;
}
@@ -495,8 +456,9 @@ static int nfs_get_option_ui_bound(struct nfs_fs_context *ctx,
/*
* Parse a single mount option in "key[=val]" form.
*/
-static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
+static int nfs_fs_context_parse_option(struct fs_context *fc, char *p)
{
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
substring_t args[MAX_OPT_ARGS];
char *string;
int ret, token;
@@ -715,8 +677,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
break;
default:
kfree(string);
- dfprintk(MOUNT, "NFS: unrecognized transport protocol\n");
- return -EINVAL;
+ return invalf("NFS: Unrecognized transport protocol");
}
kfree(string);
break;
@@ -741,8 +702,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
break;
case Opt_xprt_rdma: /* not used for side protocols */
default:
- dfprintk(MOUNT, "NFS: unrecognized transport protocol\n");
- return -EINVAL;
+ return invalf("NFS: Unrecognized transport protocol");
}
break;
case Opt_addr:
@@ -750,7 +710,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
if (string == NULL)
goto out_nomem;
ctx->nfs_server.addrlen =
- rpc_pton(ctx->net, string, strlen(string),
+ rpc_pton(fc->net_ns, string, strlen(string),
&ctx->nfs_server.address,
sizeof(ctx->nfs_server._address));
kfree(string);
@@ -770,7 +730,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
if (string == NULL)
goto out_nomem;
ctx->mount_server.addrlen =
- rpc_pton(ctx->net, string, strlen(string),
+ rpc_pton(fc->net_ns, string, strlen(string),
&ctx->mount_server.address,
sizeof(ctx->mount_server._address));
kfree(string);
@@ -795,8 +755,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
break;
default:
- dfprintk(MOUNT, "NFS: invalid lookupcache argument\n");
- return -EINVAL;
+ return invalf("NFS: Invalid lookupcache argument");
}
break;
case Opt_fscache_uniq:
@@ -826,16 +785,15 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
NFS_MOUNT_LOCAL_FCNTL);
break;
default:
- dfprintk(MOUNT, "NFS: invalid local_lock argument\n");
- return -EINVAL;
- };
+ return invalf("NFS: invalid local_lock argument");
+ }
break;
/*
* Special options
*/
case Opt_sloppy:
- ctx->sloppy = 1;
+ fc->sloppy = 1;
dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
break;
case Opt_userspace:
@@ -845,116 +803,24 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
default:
dfprintk(MOUNT, "NFS: unrecognized mount option '%s'\n", p);
- return -EINVAL;
+ if (!fc->sloppy)
+ return invalf("NFS: Unrecognized mount option '%s'", p);
+ break;
}
return 0;
-out_invalid_address:
- printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
- return -EINVAL;
-out_invalid_value:
- printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
- return -EINVAL;
out_nomem:
printk(KERN_INFO "NFS: not enough memory to parse option\n");
return -ENOMEM;
+out_invalid_value:
+ return invalf("NFS: Bad mount option value specified");
+out_invalid_address:
+ return invalf("NFS: Bad IP address specified");
}
/*
- * 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
- * skipped as they are encountered. If there were no errors, return 1;
- * otherwise return 0 (zero).
- */
-int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
-{
- char *p, *secdata;
- int rc, sloppy = 0, invalid_option = 0;
-
- if (!raw) {
- dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
- return 1;
- }
- dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
-
- secdata = alloc_secdata();
- if (!secdata)
- goto out_nomem;
-
- rc = security_sb_copy_data(raw, secdata);
- if (rc)
- goto out_security_failure;
-
- rc = security_sb_parse_opts_str(secdata, &ctx->lsm_opts);
- if (rc)
- goto out_security_failure;
-
- free_secdata(secdata);
-
- while ((p = strsep(&raw, ",")) != NULL) {
- if (!*p)
- continue;
- if (nfs_fs_context_parse_option(ctx, p) < 0)
- invalid_option = true;
- }
-
- if (!sloppy && invalid_option)
- return 0;
-
- if (ctx->minorversion && ctx->version != 4)
- goto out_minorversion_mismatch;
-
- if (ctx->options & NFS_OPTION_MIGRATION &&
- (ctx->version != 4 || ctx->minorversion != 0))
- goto out_migration_misuse;
-
- /*
- * verify that any proto=/mountproto= options match the address
- * families in the addr=/mountaddr= options.
- */
- if (ctx->protofamily != AF_UNSPEC &&
- ctx->protofamily != ctx->nfs_server.address.sa_family)
- goto out_proto_mismatch;
-
- if (ctx->mountfamily != AF_UNSPEC) {
- if (ctx->mount_server.addrlen) {
- if (ctx->mountfamily != ctx->mount_server.address.sa_family)
- goto out_mountproto_mismatch;
- } else {
- if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
- goto out_mountproto_mismatch;
- }
- }
-
- return 1;
-
-out_minorversion_mismatch:
- printk(KERN_INFO "NFS: mount option vers=%u does not support "
- "minorversion=%u\n", ctx->version, ctx->minorversion);
- return 0;
-out_mountproto_mismatch:
- printk(KERN_INFO "NFS: mount server address does not match mountproto= "
- "option\n");
- return 0;
-out_proto_mismatch:
- printk(KERN_INFO "NFS: server address does not match proto= option\n");
- return 0;
-out_migration_misuse:
- printk(KERN_INFO
- "NFS: 'migration' not supported for this NFS version\n");
- return -EINVAL;
-out_nomem:
- printk(KERN_INFO "NFS: not enough memory to parse option\n");
- return 0;
-out_security_failure:
- free_secdata(secdata);
- printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
- return 0;
-}
-
-/*
- * Split "dev_name" into "hostname:export_path".
+ * Split sc->device into "hostname:export_path".
*
* The leftmost colon demarks the split between the server's hostname
* and the export path. If the hostname starts with a left square
@@ -963,9 +829,9 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
* Note: caller frees hostname and export path, even on error.
*/
static int nfs_parse_devname(struct nfs_fs_context *ctx,
- const char *dev_name,
size_t maxnamlen, size_t maxpathlen)
{
+ char *dev_name = ctx->fc.device;
size_t len;
char *end;
@@ -1009,19 +875,15 @@ static int nfs_parse_devname(struct nfs_fs_context *ctx,
return 0;
out_bad_devname:
- dfprintk(MOUNT, "NFS: device name not in host:path format\n");
- return -EINVAL;
-
+ return invalf("NFS: device name not in host:path format");
out_nomem:
- dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
+ errorf("NFS: not enough memory to parse device name");
return -ENOMEM;
-
out_hostname:
- dfprintk(MOUNT, "NFS: server hostname too long\n");
+ errorf("NFS: server hostname too long");
return -ENAMETOOLONG;
-
out_path:
- dfprintk(MOUNT, "NFS: export pathname too long\n");
+ errorf("NFS: export pathname too long");
return -ENAMETOOLONG;
}
@@ -1041,14 +903,14 @@ static int nfs_parse_devname(struct nfs_fs_context *ctx,
* + breaking back: trying proto=udp after proto=tcp, v2 after v3,
* mountproto=tcp after mountproto=udp, and so on
*/
-static int nfs23_validate_mount_data(void *options,
- struct nfs_fs_context *ctx,
- struct nfs_fh *mntfh,
- const char *dev_name)
+static int nfs23_monolithic_mount_data(struct fs_context *fc,
+ struct nfs_mount_data *data)
{
- struct nfs_mount_data *data = (struct nfs_mount_data *)options;
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+ struct nfs_fh *mntfh = ctx->mntfh;
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
+ int ret;
if (data == NULL)
goto out_no_data;
@@ -1114,6 +976,9 @@ static int nfs23_validate_mount_data(void *options,
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
/* N.B. caller will free nfs_server.hostname in all cases */
ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
+ if (!ctx->nfs_server.hostname)
+ goto out_nomem;
+
ctx->namlen = data->namlen;
ctx->bsize = data->bsize;
@@ -1121,8 +986,6 @@ static int nfs23_validate_mount_data(void *options,
ctx->selected_flavor = data->pseudoflavor;
else
ctx->selected_flavor = RPC_AUTH_UNIX;
- if (!ctx->nfs_server.hostname)
- goto out_nomem;
if (!(data->flags & NFS_MOUNT_NONLM))
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
@@ -1130,6 +993,7 @@ static int nfs23_validate_mount_data(void *options,
else
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
NFS_MOUNT_LOCAL_FCNTL);
+
/*
* The legacy version 6 binary mount data from userspace has a
* field used only to transport selinux information into the
@@ -1140,17 +1004,16 @@ static int nfs23_validate_mount_data(void *options,
*/
if (data->context[0]){
#ifdef CONFIG_SECURITY_SELINUX
- int rc;
char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
if (!opts_str)
return -ENOMEM;
strcpy(opts_str, "context=");
data->context[NFS_MAX_CONTEXT_LEN] = '\0';
strcat(opts_str, &data->context[0]);
- rc = security_sb_parse_opts_str(opts_str, &ctx->lsm_opts);
+ ret = vfs_parse_mount_option(fc, opts_str);
kfree(opts_str);
- if (rc)
- return rc;
+ if (ret)
+ return ret;
#else
return -EINVAL;
#endif
@@ -1158,54 +1021,44 @@ static int nfs23_validate_mount_data(void *options,
break;
default:
- return NFS_TEXT_DATA;
+ return generic_monolithic_mount_data(fc, data);
}
+ ctx->skip_remount_option_check = true;
return 0;
out_no_data:
- dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
- return -EINVAL;
+ if (fc->sb_flags & MS_REMOUNT) {
+ ctx->skip_remount_option_check = true;
+ return 0;
+ }
+ return invalf("NFS: mount program didn't pass any mount data");
out_no_v3:
- dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
- data->version);
- return -EINVAL;
+ return invalf("NFS: nfs_mount_data version does not support v3");
out_no_sec:
- dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
- return -EINVAL;
+ return invalf("NFS: nfs_mount_data version supports only AUTH_SYS");
out_nomem:
- dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
+ dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
return -ENOMEM;
out_no_address:
- dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
- return -EINVAL;
+ return invalf("NFS: mount program didn't pass remote address");
out_invalid_fh:
- dfprintk(MOUNT, "NFS: invalid root filehandle\n");
- return -EINVAL;
-}
-
-#if IS_ENABLED(CONFIG_NFS_V4)
-
-static void nfs4_validate_mount_flags(struct nfs_fs_context *ctx)
-{
- ctx->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
- NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
+ return invalf("NFS: invalid root filehandle");
}
/*
* Validate NFSv4 mount options
*/
-static int nfs4_validate_mount_data(void *options,
- struct nfs_fs_context *ctx,
- const char *dev_name)
+static int nfs4_monolithic_mount_data(struct fs_context *fc,
+ struct nfs4_mount_data *data)
{
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
- struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
char *c;
if (data == NULL)
@@ -1255,7 +1108,7 @@ static int nfs4_validate_mount_data(void *options,
ctx->client_address = c;
/*
- * Translate to nfs_fs_context, which nfs4_fill_super
+ * Translate to nfs_fs_context, which nfs_fill_super
* can deal with.
*/
@@ -1275,95 +1128,372 @@ static int nfs4_validate_mount_data(void *options,
break;
default:
- return NFS_TEXT_DATA;
+ return generic_monolithic_mount_data(fc, data);
}
+ ctx->skip_remount_option_check = true;
return 0;
out_no_data:
- dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
- return -EINVAL;
+ if (fc->sb_flags & MS_REMOUNT) {
+ ctx->skip_remount_option_check = true;
+ return 0;
+ }
+ return invalf("NFS4: mount program didn't pass any mount data");
out_inval_auth:
- dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
- data->auth_flavourlen);
- return -EINVAL;
+ return invalf("NFS4: Invalid number of RPC auth flavours %d",
+ data->auth_flavourlen);
out_no_address:
- dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
- return -EINVAL;
+ return invalf("NFS4: mount program didn't pass remote address");
out_invalid_transport_udp:
- dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
- return -EINVAL;
+ return invalf("NFSv4: Unsupported transport protocol udp");
}
-int nfs_validate_mount_data(struct file_system_type *fs_type,
- void *options,
- struct nfs_fs_context *ctx,
- struct nfs_fh *mntfh,
- const char *dev_name)
-{
- if (fs_type == &nfs_fs_type)
- return nfs23_validate_mount_data(options, ctx, mntfh, dev_name);
- return nfs4_validate_mount_data(options, ctx, dev_name);
-}
-#else
-int nfs_validate_mount_data(struct file_system_type *fs_type,
- void *options,
- struct nfs_fs_context *ctx,
- struct nfs_fh *mntfh,
- const char *dev_name)
+/*
+ * Parse a monolithic block of data from sys_mount().
+ */
+static int nfs_monolithic_mount_data(struct fs_context *fc, void *data)
{
- return nfs23_validate_mount_data(options, ctx, mntfh, dev_name);
-}
+ if (fc->fs_type == &nfs_fs_type)
+ return nfs23_monolithic_mount_data(fc, data);
+
+#if IS_ENABLED(CONFIG_NFS_V4)
+ if (fc->fs_type == &nfs4_fs_type)
+ return nfs4_monolithic_mount_data(fc, data);
#endif
-int nfs_validate_text_mount_data(void *options,
- struct nfs_fs_context *ctx,
- const char *dev_name)
+ return invalf("NFS: Unsupported monolithic data version");
+}
+
+/*
+ * Validate the preparsed information in the config.
+ */
+static int nfs_fs_context_validate(struct fs_context *fc)
{
- int port = 0;
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+ struct nfs_subversion *nfs_mod;
+ struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
int max_namelen = PAGE_SIZE;
int max_pathlen = NFS_MAXPATHLEN;
- struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
+ int port = 0;
+ int ret;
- if (nfs_parse_mount_options((char *)options, ctx) == 0)
- return -EINVAL;
+ if (ctx->fc.purpose == FS_CONTEXT_FOR_REMOUNT)
+ return 0;
+
+ if (!ctx->fc.device)
+ goto out_no_device_name;
+
+ /* Check for sanity first. */
+ if (ctx->minorversion && ctx->version != 4)
+ goto out_minorversion_mismatch;
+
+ if (ctx->options & NFS_OPTION_MIGRATION &&
+ (ctx->version != 4 || ctx->minorversion != 0))
+ goto out_migration_misuse;
+
+ /* Verify that any proto=/mountproto= options match the address
+ * families in the addr=/mountaddr= options.
+ */
+ if (ctx->protofamily != AF_UNSPEC &&
+ ctx->protofamily != ctx->nfs_server.address.sa_family)
+ goto out_proto_mismatch;
+
+ if (ctx->mountfamily != AF_UNSPEC) {
+ if (ctx->mount_server.addrlen) {
+ if (ctx->mountfamily != ctx->mount_server.address.sa_family)
+ goto out_mountproto_mismatch;
+ } else {
+ if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
+ goto out_mountproto_mismatch;
+ }
+ }
if (!nfs_verify_server_address(sap))
goto out_no_address;
if (ctx->version == 4) {
-#if IS_ENABLED(CONFIG_NFS_V4)
- port = NFS_PORT;
- max_namelen = NFS4_MAXNAMLEN;
- max_pathlen = NFS4_MAXPATHLEN;
- nfs_validate_transport_protocol(ctx);
- if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
- goto out_invalid_transport_udp;
- nfs4_validate_mount_flags(ctx);
-#else
- goto out_v4_not_compiled;
-#endif /* CONFIG_NFS_V4 */
- } else
+ if (IS_ENABLED(CONFIG_NFS_V4)) {
+ port = NFS_PORT;
+ max_namelen = NFS4_MAXNAMLEN;
+ max_pathlen = NFS4_MAXPATHLEN;
+ nfs_validate_transport_protocol(ctx);
+ if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
+ goto out_invalid_transport_udp;
+ ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
+ NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
+ NFS_MOUNT_LOCAL_FCNTL);
+ } else {
+ goto out_v4_not_compiled;
+ }
+ } else {
nfs_set_mount_transport_protocol(ctx);
+ }
nfs_set_port(sap, &ctx->nfs_server.port, port);
- return nfs_parse_devname(ctx, dev_name, max_namelen, max_pathlen);
+ ret = nfs_parse_devname(ctx, max_namelen, max_pathlen);
+ if (ret < 0)
+ return ret;
-#if !IS_ENABLED(CONFIG_NFS_V4)
+ /* Load the NFS protocol module if we haven't done so yet */
+ if (!ctx->nfs_mod) {
+ nfs_mod = get_nfs_version(ctx->version);
+ if (IS_ERR(nfs_mod)) {
+ ret = PTR_ERR(nfs_mod);
+ goto out_version_unavailable;
+ }
+ ctx->nfs_mod = nfs_mod;
+ }
+ return 0;
+
+out_no_device_name:
+ return invalf("NFS: Device name not specified");
out_v4_not_compiled:
- dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
+ errorf("NFS: NFSv4 is not compiled into kernel");
return -EPROTONOSUPPORT;
-#else
out_invalid_transport_udp:
- dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
- return -EINVAL;
-#endif /* !CONFIG_NFS_V4 */
-
+ return invalf("NFSv4: Unsupported transport protocol udp");
out_no_address:
- dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
- return -EINVAL;
+ return invalf("NFS: mount program didn't pass remote address");
+out_mountproto_mismatch:
+ return invalf("NFS: Mount server address does not match mountproto= option");
+out_proto_mismatch:
+ return invalf("NFS: Server address does not match proto= option");
+out_minorversion_mismatch:
+ return invalf("NFS: Mount option vers=%u does not support minorversion=%u",
+ ctx->version, ctx->minorversion);
+out_migration_misuse:
+ return invalf("NFS: 'Migration' not supported for this NFS version");
+out_version_unavailable:
+ errorf("NFS: Version unavailable");
+ return ret;
+}
+
+/*
+ * Use the preparsed information in the config to effect a mount.
+ */
+static int nfs_get_ordinary_tree(struct nfs_fs_context *ctx)
+{
+ ctx->set_security = nfs_set_sb_security;
+
+ return ctx->nfs_mod->rpc_ops->try_get_tree(ctx);
}
+
+/*
+ * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
+ */
+static int nfs_get_xdev_tree(struct nfs_fs_context *ctx)
+{
+ struct nfs_server *server;
+ int ret;
+
+ dprintk("--> nfs_xdev_mount()\n");
+
+ ctx->set_security = nfs_clone_sb_security;
+
+ /* create a new volume representation */
+ server = ctx->nfs_mod->rpc_ops->clone_server(NFS_SB(ctx->clone_data.sb),
+ ctx->mntfh,
+ ctx->clone_data.fattr,
+ ctx->selected_flavor);
+
+ if (IS_ERR(server))
+ ret = PTR_ERR(server);
+ else
+ ret = nfs_get_tree_common(server, ctx);
+
+ dprintk("<-- nfs_get_xdev_tree() = %d\n", ret);
+ return ret;
+}
+
+/*
+ * Create an NFS superblock by the appropriate method.
+ */
+static int nfs_get_tree(struct fs_context *fc)
+{
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+ int ret;
+
+ if (!ctx->nfs_mod) {
+ pr_warn("Missing nfs_mod\n");
+ return -EINVAL;
+ }
+ if (!ctx->nfs_mod->rpc_ops) {
+ pr_warn("Missing rpc_ops\n");
+ return -EINVAL;
+ }
+
+ if (ctx->nfs_mod->rpc_ops->get_tree) {
+ ret = ctx->nfs_mod->rpc_ops->get_tree(ctx);
+ if (ret != 1)
+ return ret;
+ }
+
+ switch (ctx->mount_type) {
+ case NFS_MOUNT_ORDINARY:
+ return nfs_get_ordinary_tree(ctx);
+
+ case NFS_MOUNT_CROSS_DEV:
+ return nfs_get_xdev_tree(ctx);
+
+ default:
+ errorf("NFS: Unknown mount type");
+ return -ENOTSUPP;
+ }
+}
+
+/*
+ * Handle duplication of a configuration. The caller copied *src into *sc, but
+ * it can't deal with resource pointers in the filesystem context, so we have
+ * to do that. We need to clear pointers, copy data or get extra refs as
+ * appropriate.
+ */
+static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src)
+{
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+
+ __module_get(ctx->nfs_mod->owner);
+ ctx->client_address = NULL;
+ ctx->mount_server.hostname = NULL;
+ ctx->nfs_server.export_path = NULL;
+ ctx->nfs_server.hostname = NULL;
+ ctx->fscache_uniq = NULL;
+
+ ctx->mntfh = nfs_alloc_fhandle();
+ if (!ctx->mntfh)
+ return -ENOMEM;
+ return 0;
+}
+
+static void nfs_fs_context_free(struct fs_context *fc)
+{
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+
+ if (ctx->nfs_mod)
+ put_nfs_version(ctx->nfs_mod);
+ kfree(ctx->client_address);
+ kfree(ctx->mount_server.hostname);
+ if (ctx->nfs_server.export_path != nfs_slash)
+ kfree(ctx->nfs_server.export_path);
+ kfree(ctx->nfs_server.hostname);
+ kfree(ctx->fscache_uniq);
+ nfs_free_fhandle(ctx->mntfh);
+}
+
+static const struct fs_context_operations nfs_fs_context_ops = {
+ .free = nfs_fs_context_free,
+ .dup = nfs_fs_context_dup,
+ .parse_option = nfs_fs_context_parse_option,
+ .monolithic_mount_data = nfs_monolithic_mount_data,
+ .validate = nfs_fs_context_validate,
+ .get_tree = nfs_get_tree,
+};
+
+/*
+ * Initialise a configuration from an extant superblock for remounting.
+ */
+static int nfs_mount_init_from_sb(struct fs_context *fc,
+ struct super_block *sb)
+{
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+ struct nfs_server *nfss = sb->s_fs_info;
+ struct net *net = nfss->nfs_client->cl_net;
+
+ ctx->flags = nfss->flags;
+ ctx->rsize = nfss->rsize;
+ ctx->wsize = nfss->wsize;
+ ctx->retrans = nfss->client->cl_timeout->to_retries;
+ ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
+ ctx->acregmin = nfss->acregmin / HZ;
+ ctx->acregmax = nfss->acregmax / HZ;
+ ctx->acdirmin = nfss->acdirmin / HZ;
+ ctx->acdirmax = nfss->acdirmax / HZ;
+ ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
+ ctx->nfs_server.port = nfss->port;
+ ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
+ ctx->version = nfss->nfs_client->rpc_ops->version;
+ ctx->minorversion = nfss->nfs_client->cl_minorversion;
+
+ memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
+ ctx->nfs_server.addrlen);
+
+ if (ctx->fc.net_ns != net) {
+ put_net(ctx->fc.net_ns);
+ ctx->fc.net_ns = get_net(net);
+ }
+
+ ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
+ if (!try_module_get(ctx->nfs_mod->owner)) {
+ ctx->nfs_mod = NULL;
+ errorf("NFS: Protocol module not available");
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
+/*
+ * Prepare superblock configuration. We use the namespaces attached to the
+ * context. This may be the current process's namespaces, or it may be a
+ * container's namespaces.
+ */
+static int nfs_init_fs_context(struct fs_context *fc, struct super_block *src_sb)
+{
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+
+ ctx->mntfh = nfs_alloc_fhandle();
+ if (!ctx->mntfh)
+ return -ENOMEM;
+
+ ctx->fc.ops = &nfs_fs_context_ops;
+ ctx->mount_type = NFS_MOUNT_ORDINARY;
+ ctx->protofamily = AF_UNSPEC;
+ ctx->mountfamily = AF_UNSPEC;
+ ctx->mount_server.port = NFS_UNSPEC_PORT;
+
+ if (!src_sb) {
+ ctx->timeo = NFS_UNSPEC_TIMEO;
+ ctx->retrans = NFS_UNSPEC_RETRANS;
+ ctx->acregmin = NFS_DEF_ACREGMIN;
+ ctx->acregmax = NFS_DEF_ACREGMAX;
+ ctx->acdirmin = NFS_DEF_ACDIRMIN;
+ ctx->acdirmax = NFS_DEF_ACDIRMAX;
+ ctx->nfs_server.port = NFS_UNSPEC_PORT;
+ ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+ ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
+ ctx->minorversion = 0;
+ ctx->need_mount = true;
+ return 0;
+ }
+
+ return nfs_mount_init_from_sb(fc, src_sb);
+}
+
+struct file_system_type nfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs",
+ .init_fs_context = nfs_init_fs_context,
+ .fs_context_size = sizeof(struct nfs_fs_context),
+ .kill_sb = nfs_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
+};
+MODULE_ALIAS_FS("nfs");
+EXPORT_SYMBOL_GPL(nfs_fs_type);
+
+#if IS_ENABLED(CONFIG_NFS_V4)
+struct file_system_type nfs4_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .fs_context_size = sizeof(struct nfs_fs_context),
+ .init_fs_context = nfs_init_fs_context,
+ .kill_sb = nfs_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
+};
+MODULE_ALIAS_FS("nfs4");
+MODULE_ALIAS("nfs4");
+EXPORT_SYMBOL_GPL(nfs4_fs_type);
+#endif /* CONFIG_NFS_V4 */
diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index 391dafaf9182..4a5ee38117b5 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -68,66 +68,70 @@ static int nfs_superblock_set_dummy_root(struct super_block *sb, struct inode *i
/*
* get an NFS2/NFS3 root dentry from the root filehandle
*/
-struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh,
- const char *devname)
+int nfs_get_root(struct super_block *s, struct nfs_fs_context *ctx)
{
- struct nfs_server *server = NFS_SB(sb);
+ struct nfs_server *server = NFS_SB(s);
struct nfs_fsinfo fsinfo;
- struct dentry *ret;
+ struct dentry *root;
struct inode *inode;
- void *name = kstrdup(devname, GFP_KERNEL);
- int error;
+ char *name;
+ int error = -ENOMEM;
+ name = kstrdup(ctx->fc.device, GFP_KERNEL);
if (!name)
- return ERR_PTR(-ENOMEM);
+ goto out;
/* get the actual root for this mount */
fsinfo.fattr = nfs_alloc_fattr();
- if (fsinfo.fattr == NULL) {
- kfree(name);
- return ERR_PTR(-ENOMEM);
- }
+ if (fsinfo.fattr == NULL)
+ goto out_name;
- error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
+ error = server->nfs_client->rpc_ops->getroot(server, ctx->mntfh, &fsinfo);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
- ret = ERR_PTR(error);
- goto out;
+ errorf("NFS: Couldn't getattr on root");
+ goto out_fattr;
}
- inode = nfs_fhget(sb, mntfh, fsinfo.fattr, NULL);
+ inode = nfs_fhget(s, ctx->mntfh, fsinfo.fattr, NULL);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
- ret = ERR_CAST(inode);
- goto out;
+ error = PTR_ERR(inode);
+ errorf("NFS: Couldn't get root inode");
+ goto out_fattr;
}
- error = nfs_superblock_set_dummy_root(sb, inode);
- if (error != 0) {
- ret = ERR_PTR(error);
- goto out;
- }
+ error = nfs_superblock_set_dummy_root(s, inode);
+ if (error != 0)
+ goto out_fattr;
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
- ret = d_obtain_root(inode);
- if (IS_ERR(ret)) {
+ root = d_obtain_root(inode);
+ if (IS_ERR(root)) {
dprintk("nfs_get_root: get root dentry failed\n");
- goto out;
+ error = PTR_ERR(root);
+ errorf("NFS: Couldn't get root dentry");
+ goto out_fattr;
}
- security_d_instantiate(ret, inode);
- spin_lock(&ret->d_lock);
- if (IS_ROOT(ret) && !ret->d_fsdata &&
- !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
- ret->d_fsdata = name;
+ security_d_instantiate(root, inode);
+ spin_lock(&root->d_lock);
+ if (IS_ROOT(root) && !root->d_fsdata &&
+ !(root->d_flags & DCACHE_NFSFS_RENAMED)) {
+ root->d_fsdata = name;
name = NULL;
}
- spin_unlock(&ret->d_lock);
-out:
- kfree(name);
+ spin_unlock(&root->d_lock);
+ ctx->fc.root = root;
+ error = 0;
+
+out_fattr:
nfs_free_fattr(fsinfo.fattr);
- return ret;
+out_name:
+ kfree(name);
+out:
+ return error;
}
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index fa568407cda8..ef7193479cda 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -3,7 +3,7 @@
*/
#include "nfs4_fs.h"
-#include <linux/mount.h>
+#include <linux/fs_context.h>
#include <linux/security.h>
#include <linux/crc32.h>
#include <linux/sunrpc/addr.h>
@@ -36,18 +36,6 @@ static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
return 1;
}
-struct nfs_clone_mount {
- const struct super_block *sb;
- const struct dentry *dentry;
- struct nfs_fh *fh;
- struct nfs_fattr *fattr;
- char *hostname;
- char *mnt_path;
- struct sockaddr *addr;
- size_t addrlen;
- rpc_authflavor_t authflavor;
-};
-
/*
* Note: RFC 1813 doesn't limit the number of auth flavors that
* a server can return, so make something up.
@@ -82,10 +70,22 @@ struct nfs_client_initdata {
const struct rpc_timeout *timeparms;
};
+enum nfs_mount_type {
+ NFS_MOUNT_ORDINARY,
+ NFS_MOUNT_CROSS_DEV,
+ NFS4_MOUNT_REMOTE,
+ NFS4_MOUNT_REFERRAL,
+ NFS4_MOUNT_REMOTE_REFERRAL,
+};
+
/*
* In-kernel mount arguments
*/
struct nfs_fs_context {
+ struct fs_context fc;
+ enum nfs_mount_type mount_type : 8;
+ bool skip_remount_option_check;
+ bool need_mount;
unsigned int flags; /* NFS{,4}_MOUNT_* flags */
unsigned int rsize, wsize;
unsigned int timeo, retrans;
@@ -102,8 +102,6 @@ struct nfs_fs_context {
char *fscache_uniq;
unsigned short protofamily;
unsigned short mountfamily;
- bool need_mount;
- bool sloppy;
struct {
union {
@@ -127,10 +125,22 @@ struct nfs_fs_context {
char *export_path;
int port;
unsigned short protocol;
+ unsigned short export_path_len;
} nfs_server;
- struct security_mnt_opts lsm_opts;
- struct net *net;
+ struct nfs_fh *mntfh;
+ struct nfs_subversion *nfs_mod;
+ struct nfs_server *server;
+
+ int (*set_security)(struct super_block *, struct nfs_fs_context *);
+
+ /* Information for a cloned mount. */
+ struct nfs_clone_mount {
+ struct super_block *sb;
+ struct dentry *dentry;
+ struct nfs_fattr *fattr;
+ bool cloned;
+ } clone_data;
char buf[32]; /* Parse buffer */
};
@@ -150,14 +160,6 @@ struct nfs_mount_request {
struct net *net;
};
-struct nfs_mount_info {
- void (*fill_super)(struct super_block *, struct nfs_mount_info *);
- int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
- struct nfs_fs_context *ctx;
- struct nfs_clone_mount *cloned;
- struct nfs_fh *mntfh;
-};
-
extern int nfs_mount(struct nfs_mount_request *info);
extern void nfs_umount(const struct nfs_mount_request *info);
@@ -183,13 +185,9 @@ extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
extern struct nfs_client *
nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
struct nfs4_sessionid *, u32);
-extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
- struct nfs_subversion *);
-extern struct nfs_server *nfs4_create_server(
- struct nfs_mount_info *,
- struct nfs_subversion *);
-extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
- struct nfs_fh *);
+extern struct nfs_server *nfs_create_server(struct nfs_fs_context *);
+extern struct nfs_server *nfs4_create_server(struct nfs_fs_context *);
+extern struct nfs_server *nfs4_create_referral_server(struct nfs_fs_context *);
extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
struct sockaddr *sap, size_t salen,
struct net *net);
@@ -243,19 +241,7 @@ extern struct svc_version nfs4_callback_version4;
struct nfs_pageio_descriptor;
/* mount.c */
-#define NFS_TEXT_DATA 1
-
-extern struct nfs_fs_context *nfs_alloc_parsed_mount_data(void);
-extern void nfs_free_parsed_mount_data(struct nfs_fs_context *ctx);
-extern int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx);
-extern int nfs_validate_mount_data(struct file_system_type *fs_type,
- void *options,
- struct nfs_fs_context *ctx,
- struct nfs_fh *mntfh,
- const char *dev_name);
-extern int nfs_validate_text_mount_data(void *options,
- struct nfs_fs_context *ctx,
- const char *dev_name);
+extern const char nfs_slash[];
/* pagelist.c */
extern int __init nfs_init_nfspagecache(void);
@@ -418,23 +404,12 @@ extern int nfs_wait_atomic_killable(atomic_t *p);
/* super.c */
extern const struct super_operations nfs_sops;
extern struct file_system_type nfs_fs_type;
-extern struct file_system_type nfs_xdev_fs_type;
-#if IS_ENABLED(CONFIG_NFS_V4)
-extern struct file_system_type nfs4_xdev_fs_type;
-extern struct file_system_type nfs4_referral_fs_type;
-#endif
bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
-struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
- struct nfs_subversion *);
-int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
-int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
-struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
- struct nfs_mount_info *, struct nfs_subversion *);
-struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
-struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
- const char *, struct nfs_mount_info *);
+int nfs_try_get_tree(struct nfs_fs_context *);
+int nfs_set_sb_security(struct super_block *, struct nfs_fs_context *);
+int nfs_clone_sb_security(struct super_block *, struct nfs_fs_context *);
+int nfs_get_tree_common(struct nfs_server *, struct nfs_fs_context *);
void nfs_kill_super(struct super_block *);
-void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
extern struct rpc_stat nfs_rpcstat;
@@ -467,12 +442,9 @@ struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
struct nfs_fattr *, rpc_authflavor_t);
/* getroot.c */
-extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
- const char *);
+extern int nfs_get_root(struct super_block *s, struct nfs_fs_context *cfg);
#if IS_ENABLED(CONFIG_NFS_V4)
-extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
- const char *);
-
+extern int nfs4_get_root(struct super_block *s, struct nfs_fs_context *cfg);
extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
#endif
@@ -491,7 +463,7 @@ int nfs_show_options(struct seq_file *, struct dentry *);
int nfs_show_devname(struct seq_file *, struct dentry *);
int nfs_show_path(struct seq_file *, struct dentry *);
int nfs_show_stats(struct seq_file *, struct dentry *);
-int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
+int nfs_remount(struct super_block *sb, struct fs_context *fc);
/* write.c */
extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index e5686be67be8..f80062d626f9 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -18,6 +18,7 @@
#include <linux/vfs.h>
#include <linux/sunrpc/gss_api.h>
#include "internal.h"
+#include "nfs.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@@ -209,16 +210,6 @@ void nfs_release_automount_timer(void)
cancel_delayed_work(&nfs_automount_task);
}
-/*
- * Clone a mountpoint of the appropriate type
- */
-static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server,
- const char *devname,
- struct nfs_clone_mount *mountdata)
-{
- return vfs_submount(mountdata->dentry, &nfs_xdev_fs_type, devname, mountdata);
-}
-
/**
* nfs_do_submount - set up mountpoint when crossing a filesystem boundary
* @dentry - parent directory
@@ -230,27 +221,58 @@ static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server,
struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
struct nfs_fattr *fattr, rpc_authflavor_t authflavor)
{
- struct nfs_clone_mount mountdata = {
- .sb = dentry->d_sb,
- .dentry = dentry,
- .fh = fh,
- .fattr = fattr,
- .authflavor = authflavor,
- };
+ struct nfs_fs_context *ctx;
+ struct fs_context *fc;
struct vfsmount *mnt;
- char *page = (char *) __get_free_page(GFP_USER);
- char *devname;
+ char *buffer, *p;
+ int ret;
+
+ /* Open a new filesystem context, transferring parameters from the
+ * parent superblock, including the network namespace.
+ */
+ fc = vfs_new_fs_context(&nfs_fs_type, dentry->d_sb, 0,
+ FS_CONTEXT_FOR_SUBMOUNT);
+ if (IS_ERR(fc))
+ return ERR_CAST(fc);
+ ctx = container_of(fc, struct nfs_fs_context, fc);
+
+ mnt = ERR_PTR(-ENOMEM);
+ buffer = kmalloc(4096, GFP_USER);
+ if (!buffer)
+ goto err_fc;
+
+ ctx->mount_type = NFS_MOUNT_CROSS_DEV;
+ ctx->selected_flavor = authflavor;
+ ctx->clone_data.sb = dentry->d_sb;
+ ctx->clone_data.dentry = dentry;
+ ctx->clone_data.fattr = fattr;
+ ctx->clone_data.cloned = true;
+
+ nfs_copy_fh(ctx->mntfh, fh);
+
+ p = nfs_devname(dentry, buffer, 4096);
+ if (IS_ERR(p)) {
+ errorf("NFS: Couldn't determine submount pathname");
+ mnt = ERR_CAST(p);
+ goto err_buffer;
+ }
+
+ ctx->fc.device = kmemdup(p, buffer + 4096 - p, GFP_KERNEL);
+ kfree(buffer);
+ if (!ctx->fc.device)
+ goto err_fc;
- if (page == NULL)
- return ERR_PTR(-ENOMEM);
+ ret = vfs_get_tree(fc);
+ if (ret < 0)
+ goto err_fc;
- devname = nfs_devname(dentry, page, PAGE_SIZE);
- if (IS_ERR(devname))
- mnt = ERR_CAST(devname);
- else
- mnt = nfs_do_clone_mount(NFS_SB(dentry->d_sb), devname, &mountdata);
+ mnt = vfs_kern_mount_fc(&ctx->fc);
+ goto err_fc;
- free_page((unsigned long)page);
+err_buffer:
+ kfree(buffer);
+err_fc:
+ put_fs_context(fc);
return mnt;
}
EXPORT_SYMBOL_GPL(nfs_do_submount);
diff --git a/fs/nfs/nfs3_fs.h b/fs/nfs/nfs3_fs.h
index e134d6548ab7..2094bb1f022e 100644
--- a/fs/nfs/nfs3_fs.h
+++ b/fs/nfs/nfs3_fs.h
@@ -26,7 +26,7 @@ static inline int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
#endif /* CONFIG_NFS_V3_ACL */
/* nfs3client.c */
-struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
+struct nfs_server *nfs3_create_server(struct nfs_fs_context *);
struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
struct nfs_fattr *, rpc_authflavor_t);
diff --git a/fs/nfs/nfs3client.c b/fs/nfs/nfs3client.c
index 7879f2a0fcfd..3b99d4985c4c 100644
--- a/fs/nfs/nfs3client.c
+++ b/fs/nfs/nfs3client.c
@@ -45,10 +45,10 @@ static inline void nfs_init_server_aclclient(struct nfs_server *server)
}
#endif
-struct nfs_server *nfs3_create_server(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct nfs_server *nfs3_create_server(struct nfs_fs_context *ctx)
{
- struct nfs_server *server = nfs_create_server(mount_info, nfs_mod);
+ struct nfs_server *server = nfs_create_server(ctx);
+
/* Create a client RPC handle for the NFS v3 ACL management interface */
if (!IS_ERR(server))
nfs_init_server_aclclient(server);
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 0c07b567118d..96e315916a34 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -975,7 +975,7 @@ const struct nfs_rpc_ops nfs_v3_clientops = {
.nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
.getroot = nfs3_proc_get_root,
.submount = nfs_submount,
- .try_mount = nfs_try_mount,
+ .try_get_tree = nfs_try_get_tree,
.getattr = nfs3_proc_getattr,
.setattr = nfs3_proc_setattr,
.lookup = nfs3_proc_lookup,
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index af285cc27ccf..c5882668dc8a 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -467,7 +467,6 @@ extern const nfs4_stateid zero_stateid;
/* nfs4super.c */
struct nfs_mount_info;
extern struct nfs_subversion nfs_v4;
-struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
extern bool nfs4_disable_idmapping;
extern unsigned short max_session_slots;
extern unsigned short max_session_cb_slots;
@@ -477,6 +476,9 @@ extern bool recover_lost_locks;
#define NFS4_CLIENT_ID_UNIQ_LEN (64)
extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
+extern int nfs4_try_get_tree(struct nfs_fs_context *);
+extern int nfs4_get_tree(struct nfs_fs_context *);
+
/* nfs4sysctl.c */
#ifdef CONFIG_SYSCTL
int nfs4_register_sysctl(void);
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 0b5e1ecfa8f8..431eae161383 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -1032,14 +1032,14 @@ static int nfs4_init_server(struct nfs_server *server,
/* Get a client record */
error = nfs4_set_client(server,
- ctx->nfs_server.hostname,
- (const struct sockaddr *)&ctx->nfs_server.address,
- ctx->nfs_server.addrlen,
- ctx->client_address,
- ctx->nfs_server.protocol,
- &timeparms,
- ctx->minorversion,
- ctx->net);
+ ctx->nfs_server.hostname,
+ &ctx->nfs_server.address,
+ ctx->nfs_server.addrlen,
+ ctx->client_address,
+ ctx->nfs_server.protocol,
+ &timeparms,
+ ctx->minorversion,
+ ctx->fc.net_ns);
if (error < 0)
return error;
@@ -1062,10 +1062,7 @@ static int nfs4_init_server(struct nfs_server *server,
* Create a version 4 volume record
* - keyed on server and FSID
*/
-/*struct nfs_server *nfs4_create_server(const struct nfs_fs_context *data,
- struct nfs_fh *mntfh)*/
-struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct nfs_server *nfs4_create_server(struct nfs_fs_context *ctx)
{
struct nfs_server *server;
bool auth_probe;
@@ -1075,14 +1072,14 @@ struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
if (!server)
return ERR_PTR(-ENOMEM);
- auth_probe = mount_info->ctx->auth_info.flavor_len < 1;
+ auth_probe = ctx->auth_info.flavor_len < 1;
/* set up the general RPC client */
- error = nfs4_init_server(server, mount_info->ctx);
+ error = nfs4_init_server(server, ctx);
if (error < 0)
goto error;
- error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
+ error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
if (error < 0)
goto error;
@@ -1096,8 +1093,7 @@ struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
/*
* Create an NFS4 referral server record
*/
-struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
- struct nfs_fh *mntfh)
+struct nfs_server *nfs4_create_referral_server(struct nfs_fs_context *ctx)
{
struct nfs_client *parent_client;
struct nfs_server *server, *parent_server;
@@ -1108,7 +1104,7 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
if (!server)
return ERR_PTR(-ENOMEM);
- parent_server = NFS_SB(data->sb);
+ parent_server = NFS_SB(ctx->clone_data.sb);
parent_client = parent_server->nfs_client;
/* Initialise the client representation from the parent server */
@@ -1116,9 +1112,10 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
/* Get a client representation.
* Note: NFSv4 always uses TCP, */
- error = nfs4_set_client(server, data->hostname,
- data->addr,
- data->addrlen,
+ error = nfs4_set_client(server,
+ ctx->nfs_server.hostname,
+ &ctx->nfs_server.address,
+ ctx->nfs_server.addrlen,
parent_client->cl_ipaddr,
rpc_protocol(parent_server->client),
parent_server->client->cl_timeout,
@@ -1127,13 +1124,14 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
if (error < 0)
goto error;
- error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
+ error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout,
+ ctx->selected_flavor);
if (error < 0)
goto error;
auth_probe = parent_server->auth_info.flavor_len < 1;
- error = nfs4_server_common_setup(server, mntfh, auth_probe);
+ error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
if (error < 0)
goto error;
diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index 7d531da1bae3..07466ae971cc 100644
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -7,6 +7,7 @@
* NFSv4 namespace
*/
+#include <linux/module.h>
#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
@@ -20,37 +21,64 @@
#include <linux/inet.h>
#include "internal.h"
#include "nfs4_fs.h"
+#include "nfs.h"
#include "dns_resolve.h"
#define NFSDBG_FACILITY NFSDBG_VFS
/*
+ * Work out the length that an NFSv4 path would render to as a standard posix
+ * path, with a leading slash but no terminating slash.
+ */
+static ssize_t nfs4_pathname_len(const struct nfs4_pathname *pathname)
+{
+ ssize_t len;
+ int i;
+
+ for (i = 0; i < pathname->ncomponents; i++) {
+ const struct nfs4_string *component = &pathname->components[i];
+
+ if (component->len > NAME_MAX)
+ goto too_long;
+ len += 1 + component->len; /* Adding "/foo" */
+ if (len > PATH_MAX)
+ goto too_long;
+ }
+ return len;
+
+too_long:
+ return -ENAMETOOLONG;
+}
+
+/*
* Convert the NFSv4 pathname components into a standard posix path.
- *
- * Note that the resulting string will be placed at the end of the buffer
*/
-static inline char *nfs4_pathname_string(const struct nfs4_pathname *pathname,
- char *buffer, ssize_t buflen)
+static char *nfs4_pathname_string(const struct nfs4_pathname *pathname,
+ unsigned short *_len)
{
- char *end = buffer + buflen;
- int n;
+ ssize_t len;
+ char *buf, *p;
+ int i;
- *--end = '\0';
- buflen--;
-
- n = pathname->ncomponents;
- while (--n >= 0) {
- const struct nfs4_string *component = &pathname->components[n];
- buflen -= component->len + 1;
- if (buflen < 0)
- goto Elong;
- end -= component->len;
- memcpy(end, component->data, component->len);
- *--end = '/';
+ len = nfs4_pathname_len(pathname);
+ if (len < 0)
+ return ERR_PTR(len);
+ *_len = len;
+
+ p = buf = kmalloc(len + 1, GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < pathname->ncomponents; i++) {
+ const struct nfs4_string *component = &pathname->components[i];
+
+ *p++ = '/';
+ memcpy(p, component->data, component->len);
+ p += component->len;
}
- return end;
-Elong:
- return ERR_PTR(-ENAMETOOLONG);
+
+ *p = 0;
+ return buf;
}
/*
@@ -99,21 +127,25 @@ static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen)
*/
static int nfs4_validate_fspath(struct dentry *dentry,
const struct nfs4_fs_locations *locations,
- char *page, char *page2)
+ struct nfs_fs_context *ctx)
{
- const char *path, *fs_path;
+ const char *path;
+ char *buf;
+ int n;
- path = nfs4_path(dentry, page, PAGE_SIZE);
- if (IS_ERR(path))
+ buf = kmalloc(4096, GFP_KERNEL);
+ path = nfs4_path(dentry, buf, 4096);
+ if (IS_ERR(path)) {
+ kfree(buf);
return PTR_ERR(path);
+ }
- fs_path = nfs4_pathname_string(&locations->fs_path, page2, PAGE_SIZE);
- if (IS_ERR(fs_path))
- return PTR_ERR(fs_path);
-
- if (strncmp(path, fs_path, strlen(fs_path)) != 0) {
+ n = strncmp(path, ctx->nfs_server.export_path,
+ ctx->nfs_server.export_path_len);
+ kfree(buf);
+ if (n != 0) {
dprintk("%s: path %s does not begin with fsroot %s\n",
- __func__, path, fs_path);
+ __func__, path, ctx->nfs_server.export_path);
return -ENOENT;
}
@@ -234,56 +266,66 @@ nfs4_negotiate_security(struct rpc_clnt *clnt, struct inode *inode,
return new;
}
-static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
- char *page, char *page2,
+static struct vfsmount *try_location(struct dentry *dentry,
+ struct nfs_fs_context *ctx,
const struct nfs4_fs_location *location)
{
- const size_t addr_bufsize = sizeof(struct sockaddr_storage);
- struct net *net = rpc_net_ns(NFS_SB(mountdata->sb)->client);
+ struct net *net = rpc_net_ns(NFS_SB(dentry->d_sb)->client);
struct vfsmount *mnt = ERR_PTR(-ENOENT);
- char *mnt_path;
- unsigned int maxbuflen;
- unsigned int s;
+ unsigned int len, s;
+ char *p;
- mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
- if (IS_ERR(mnt_path))
- return ERR_CAST(mnt_path);
- mountdata->mnt_path = mnt_path;
- maxbuflen = mnt_path - 1 - page2;
+ /* Allocate a buffer big enough to hold any of the hostnames plus a
+ * terminating char and also a buffer big enough to hold the hostname
+ * plus a colon plus the path.
+ */
+ len = 0;
+ for (s = 0; s < location->nservers; s++) {
+ const struct nfs4_string *buf = &location->servers[s];
+ if (buf->len > len)
+ len = buf->len;
+ }
- mountdata->addr = kmalloc(addr_bufsize, GFP_KERNEL);
- if (mountdata->addr == NULL)
+ ctx->nfs_server.hostname = kmalloc(len + 1, GFP_KERNEL);
+ if (!ctx->nfs_server.hostname)
return ERR_PTR(-ENOMEM);
+ ctx->fc.device = kmalloc(len + 1 + ctx->nfs_server.export_path_len + 1,
+ GFP_KERNEL);
+ if (!ctx->fc.device)
+ return ERR_PTR(-ENOMEM);
+
for (s = 0; s < location->nservers; s++) {
const struct nfs4_string *buf = &location->servers[s];
- if (buf->len <= 0 || buf->len >= maxbuflen)
- continue;
-
if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len))
continue;
- mountdata->addrlen = nfs_parse_server_name(buf->data, buf->len,
- mountdata->addr, addr_bufsize, net);
- if (mountdata->addrlen == 0)
+ ctx->nfs_server.addrlen =
+ nfs_parse_server_name(buf->data, buf->len,
+ &ctx->nfs_server.address,
+ sizeof(ctx->nfs_server._address),
+ net);
+ if (ctx->nfs_server.addrlen == 0)
continue;
- rpc_set_port(mountdata->addr, NFS_PORT);
+ rpc_set_port(&ctx->nfs_server.address, NFS_PORT);
- memcpy(page2, buf->data, buf->len);
- page2[buf->len] = '\0';
- mountdata->hostname = page2;
+ memcpy(ctx->nfs_server.hostname, buf->data, buf->len);
+ ctx->nfs_server.hostname[buf->len] = '\0';
- snprintf(page, PAGE_SIZE, "%s:%s",
- mountdata->hostname,
- mountdata->mnt_path);
+ p = ctx->fc.device;
+ memcpy(p, buf->data, buf->len);
+ p += buf->len;
+ *p++ = ':';
+ memcpy(p, ctx->nfs_server.export_path, ctx->nfs_server.export_path_len);
+ p += ctx->nfs_server.export_path_len;
+ *p = 0;
- mnt = vfs_submount(mountdata->dentry, &nfs4_referral_fs_type, page, mountdata);
+ mnt = vfs_kern_mount_fc(&ctx->fc);
if (!IS_ERR(mnt))
break;
}
- kfree(mountdata->addr);
return mnt;
}
@@ -296,33 +338,43 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
static struct vfsmount *nfs_follow_referral(struct dentry *dentry,
const struct nfs4_fs_locations *locations)
{
- struct vfsmount *mnt = ERR_PTR(-ENOENT);
- struct nfs_clone_mount mountdata = {
- .sb = dentry->d_sb,
- .dentry = dentry,
- .authflavor = NFS_SB(dentry->d_sb)->client->cl_auth->au_flavor,
- };
- char *page = NULL, *page2 = NULL;
+ struct nfs_fs_context *ctx;
+ struct fs_context *fc;
+ struct vfsmount *mnt;
+ char *export_path;
int loc, error;
if (locations == NULL || locations->nlocations <= 0)
goto out;
+ fc = vfs_new_fs_context(&nfs4_fs_type, dentry->d_sb, 0,
+ FS_CONTEXT_FOR_SUBMOUNT);
+ if (IS_ERR(fc)) {
+ mnt = ERR_CAST(fc);
+ goto out;
+ }
+ ctx = container_of(fc, struct nfs_fs_context, fc);
+
dprintk("%s: referral at %pd2\n", __func__, dentry);
- page = (char *) __get_free_page(GFP_USER);
- if (!page)
- goto out;
+ ctx->mount_type = NFS4_MOUNT_REFERRAL;
+ ctx->clone_data.sb = dentry->d_sb;
+ ctx->clone_data.dentry = dentry;
+ ctx->clone_data.cloned = true;
- page2 = (char *) __get_free_page(GFP_USER);
- if (!page2)
- goto out;
+ export_path = nfs4_pathname_string(&locations->fs_path,
+ &ctx->nfs_server.export_path_len);
+ if (IS_ERR(export_path)) {
+ mnt = ERR_CAST(export_path);
+ goto out_sc;
+ }
+ ctx->nfs_server.export_path = export_path;
/* Ensure fs path is a prefix of current dentry path */
- error = nfs4_validate_fspath(dentry, locations, page, page2);
+ error = nfs4_validate_fspath(dentry, locations, ctx);
if (error < 0) {
mnt = ERR_PTR(error);
- goto out;
+ goto out_sc;
}
for (loc = 0; loc < locations->nlocations; loc++) {
@@ -332,14 +384,14 @@ static struct vfsmount *nfs_follow_referral(struct dentry *dentry,
location->rootpath.ncomponents == 0)
continue;
- mnt = try_location(&mountdata, page, page2, location);
+ mnt = try_location(ctx->clone_data.dentry, ctx, location);
if (!IS_ERR(mnt))
break;
}
+out_sc:
+ put_fs_context(fc);
out:
- free_page((unsigned long) page);
- free_page((unsigned long) page2);
return mnt;
}
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c08c46a3b8cd..ca792f799941 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -9307,8 +9307,9 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
.file_inode_ops = &nfs4_file_inode_operations,
.file_ops = &nfs4_file_operations,
.getroot = nfs4_proc_get_root,
+ .get_tree = nfs4_get_tree,
.submount = nfs4_submount,
- .try_mount = nfs4_try_mount,
+ .try_get_tree = nfs4_try_get_tree,
.getattr = nfs4_proc_getattr,
.setattr = nfs4_proc_setattr,
.lookup = nfs4_proc_lookup,
diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c
index 70111f222a25..9f2eacfee42c 100644
--- a/fs/nfs/nfs4super.c
+++ b/fs/nfs/nfs4super.c
@@ -3,6 +3,7 @@
*/
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/mount.h>
#include <linux/nfs4_mount.h>
#include <linux/nfs_fs.h>
#include "delegation.h"
@@ -17,36 +18,6 @@
static int nfs4_write_inode(struct inode *inode, struct writeback_control *wbc);
static void nfs4_evict_inode(struct inode *inode);
-static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-
-static struct file_system_type nfs4_remote_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_remote_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-
-static struct file_system_type nfs4_remote_referral_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_remote_referral_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-
-struct file_system_type nfs4_referral_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_referral_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
static const struct super_operations nfs4_sops = {
.alloc_inode = nfs_alloc_inode,
@@ -60,16 +31,16 @@ static const struct super_operations nfs4_sops = {
.show_devname = nfs_show_devname,
.show_path = nfs_show_path,
.show_stats = nfs_show_stats,
- .remount_fs = nfs_remount,
+ .remount_fs_fc = nfs_remount,
};
struct nfs_subversion nfs_v4 = {
- .owner = THIS_MODULE,
- .nfs_fs = &nfs4_fs_type,
- .rpc_vers = &nfs_version4,
- .rpc_ops = &nfs_v4_clientops,
- .sops = &nfs4_sops,
- .xattr = nfs4_xattr_handlers,
+ .owner = THIS_MODULE,
+ .nfs_fs = &nfs4_fs_type,
+ .rpc_vers = &nfs_version4,
+ .rpc_ops = &nfs_v4_clientops,
+ .sops = &nfs4_sops,
+ .xattr = nfs4_xattr_handlers,
};
static int nfs4_write_inode(struct inode *inode, struct writeback_control *wbc)
@@ -103,47 +74,63 @@ static void nfs4_evict_inode(struct inode *inode)
/*
* Get the superblock for the NFS4 root partition
*/
-static struct dentry *
-nfs4_remote_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *info)
+static int nfs4_get_remote_tree(struct nfs_fs_context *ctx)
{
- struct nfs_mount_info *mount_info = info;
struct nfs_server *server;
- struct dentry *mntroot = ERR_PTR(-ENOMEM);
- mount_info->set_security = nfs_set_sb_security;
+ ctx->set_security = nfs_set_sb_security;
/* Get a volume representation */
- server = nfs4_create_server(mount_info, &nfs_v4);
- if (IS_ERR(server)) {
- mntroot = ERR_CAST(server);
- goto out;
- }
-
- mntroot = nfs_fs_mount_common(server, flags, dev_name, mount_info, &nfs_v4);
+ server = nfs4_create_server(ctx);
+ if (IS_ERR(server))
+ return PTR_ERR(server);
-out:
- return mntroot;
+ return nfs_get_tree_common(server, ctx);
}
-static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
- int flags, void *data, const char *hostname)
+/*
+ * Create a mount for the root of the server. We copy the mount context we
+ * have for the parameters and set its hostname, path and type.
+ */
+static struct vfsmount *nfs_do_root_mount(struct nfs_fs_context *ctx,
+ const char *hostname,
+ enum nfs_mount_type type)
{
+ struct nfs_fs_context *root_ctx;
+ struct fs_context *root_fc;
struct vfsmount *root_mnt;
char *root_devname;
size_t len;
+ int ret;
+
+ root_fc = vfs_dup_fs_context(&ctx->fc);
+ if (IS_ERR(root_fc))
+ return ERR_CAST(root_fc);
+ root_ctx = container_of(root_fc, struct nfs_fs_context, fc);
+
+ root_ctx->mount_type = type;
+ root_ctx->nfs_server.export_path = (char *)nfs_slash;
len = strlen(hostname) + 5;
+ root_mnt = ERR_PTR(-ENOMEM);
root_devname = kmalloc(len, GFP_KERNEL);
if (root_devname == NULL)
- return ERR_PTR(-ENOMEM);
+ goto out_fc;
+
/* Does hostname needs to be enclosed in brackets? */
if (strchr(hostname, ':'))
snprintf(root_devname, len, "[%s]:/", hostname);
else
snprintf(root_devname, len, "%s:/", hostname);
- root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
- kfree(root_devname);
+ root_ctx->fc.device = root_devname;
+
+ ret = vfs_get_tree(&root_ctx->fc);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ root_mnt = vfs_kern_mount_fc(&root_ctx->fc);
+out_fc:
+ put_fs_context(root_fc);
return root_mnt;
}
@@ -234,89 +221,98 @@ static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
return dentry;
}
-struct dentry *nfs4_try_mount(int flags, const char *dev_name,
- struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+int nfs4_try_get_tree(struct nfs_fs_context *ctx)
{
- char *export_path;
struct vfsmount *root_mnt;
- struct dentry *res;
- struct nfs_fs_context *ctx = mount_info->ctx;
+ struct dentry *root;
- dfprintk(MOUNT, "--> nfs4_try_mount()\n");
+ dfprintk(MOUNT, "--> nfs4_try_get_tree()\n");
- export_path = ctx->nfs_server.export_path;
- ctx->nfs_server.export_path = "/";
- root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info,
- ctx->nfs_server.hostname);
- ctx->nfs_server.export_path = export_path;
-
- res = nfs_follow_remote_path(root_mnt, export_path);
+ /* We create a mount for the server's root, walk to the requested
+ * location and then create another mount for that.
+ */
+ root_mnt = nfs_do_root_mount(ctx, ctx->nfs_server.hostname,
+ NFS4_MOUNT_REMOTE);
+ if (IS_ERR(root_mnt))
+ return PTR_ERR(root_mnt);
+
+ root = nfs_follow_remote_path(root_mnt, ctx->nfs_server.export_path);
+ if (IS_ERR(root)) {
+ errorf("NFS4: Couldn't follow remote path");
+ dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld [error]\n",
+ PTR_ERR(root));
+ return PTR_ERR(root);
+ }
- dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n",
- PTR_ERR_OR_ZERO(res),
- IS_ERR(res) ? " [error]" : "");
- return res;
+ ctx->fc.root = root;
+ dfprintk(MOUNT, "<-- nfs4_try_get_tree() = 0\n");
+ return 0;
}
-static struct dentry *
-nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
+static int nfs4_get_remote_referral_tree(struct nfs_fs_context *ctx)
{
- struct nfs_mount_info mount_info = {
- .fill_super = nfs_fill_super,
- .set_security = nfs_clone_sb_security,
- .cloned = raw_data,
- };
struct nfs_server *server;
- struct dentry *mntroot = ERR_PTR(-ENOMEM);
- dprintk("--> nfs4_referral_get_sb()\n");
+ dprintk("--> nfs4_get_remote_referral_tree()\n");
- mount_info.mntfh = nfs_alloc_fhandle();
- if (mount_info.cloned == NULL || mount_info.mntfh == NULL)
- goto out;
+ ctx->set_security = nfs_clone_sb_security;
+
+ if (!ctx->clone_data.cloned)
+ return -EINVAL;
/* create a new volume representation */
- server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh);
- if (IS_ERR(server)) {
- mntroot = ERR_CAST(server);
- goto out;
- }
+ server = nfs4_create_referral_server(ctx);
+ if (IS_ERR(server))
+ return PTR_ERR(server);
- mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, &nfs_v4);
-out:
- nfs_free_fhandle(mount_info.mntfh);
- return mntroot;
+ return nfs_get_tree_common(server, ctx);
}
/*
* Create an NFS4 server record on referral traversal
*/
-static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data)
+static int nfs4_get_referral_tree(struct nfs_fs_context *ctx)
{
- struct nfs_clone_mount *data = raw_data;
- char *export_path;
struct vfsmount *root_mnt;
- struct dentry *res;
+ struct dentry *root;
dprintk("--> nfs4_referral_mount()\n");
- export_path = data->mnt_path;
- data->mnt_path = "/";
+ root_mnt = nfs_do_root_mount(ctx, ctx->nfs_server.hostname,
+ NFS4_MOUNT_REMOTE_REFERRAL);
- root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
- flags, data, data->hostname);
- data->mnt_path = export_path;
+ root = nfs_follow_remote_path(root_mnt, ctx->nfs_server.export_path);
+ if (IS_ERR(root)) {
+ errorf("NFS4: Couldn't follow remote path");
+ dfprintk(MOUNT, "<-- nfs4_referral_mount() = %ld [error]\n",
+ PTR_ERR(root));
+ return PTR_ERR(root);
+ }
- res = nfs_follow_remote_path(root_mnt, export_path);
- dprintk("<-- nfs4_referral_mount() = %d%s\n",
- PTR_ERR_OR_ZERO(res),
- IS_ERR(res) ? " [error]" : "");
- return res;
+ ctx->fc.root = root;
+ dfprintk(MOUNT, "<-- nfs4_get_referral_tree() = 0\n");
+ return 0;
}
+/*
+ * Handle special NFS4 mount types.
+ */
+int nfs4_get_tree(struct nfs_fs_context *ctx)
+{
+ switch (ctx->mount_type) {
+ case NFS4_MOUNT_REMOTE:
+ return nfs4_get_remote_tree(ctx);
+
+ case NFS4_MOUNT_REFERRAL:
+ return nfs4_get_referral_tree(ctx);
+
+ case NFS4_MOUNT_REMOTE_REFERRAL:
+ return nfs4_get_remote_referral_tree(ctx);
+
+ default:
+ return 1;
+ }
+}
static int __init init_nfs_v4(void)
{
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 9872cf676a50..cd22b82e7bb8 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -705,7 +705,7 @@ const struct nfs_rpc_ops nfs_v2_clientops = {
.file_ops = &nfs_file_operations,
.getroot = nfs_proc_get_root,
.submount = nfs_submount,
- .try_mount = nfs_try_mount,
+ .try_get_tree = nfs_try_get_tree,
.getattr = nfs_proc_getattr,
.setattr = nfs_proc_setattr,
.lookup = nfs_proc_lookup,
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index c13f0ff42df9..3ef689c08f48 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -69,27 +69,6 @@
#define NFSDBG_FACILITY NFSDBG_VFS
-static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-
-struct file_system_type nfs_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs",
- .mount = nfs_fs_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-MODULE_ALIAS_FS("nfs");
-EXPORT_SYMBOL_GPL(nfs_fs_type);
-
-struct file_system_type nfs_xdev_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs",
- .mount = nfs_xdev_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-
const struct super_operations nfs_sops = {
.alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode,
@@ -102,22 +81,11 @@ const struct super_operations nfs_sops = {
.show_devname = nfs_show_devname,
.show_path = nfs_show_path,
.show_stats = nfs_show_stats,
- .remount_fs = nfs_remount,
+ .remount_fs_fc = nfs_remount,
};
EXPORT_SYMBOL_GPL(nfs_sops);
#if IS_ENABLED(CONFIG_NFS_V4)
-struct file_system_type nfs4_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs_fs_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-MODULE_ALIAS_FS("nfs4");
-MODULE_ALIAS("nfs4");
-EXPORT_SYMBOL_GPL(nfs4_fs_type);
-
static int __init register_nfs4_fs(void)
{
return register_filesystem(&nfs4_fs_type);
@@ -710,11 +678,11 @@ bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
EXPORT_SYMBOL_GPL(nfs_auth_info_match);
/*
- * Ensure that a specified authtype in cfg->auth_info is supported by
- * the server. Returns 0 and sets cfg->selected_flavor if it's ok, and
+ * Ensure that a specified authtype in ctx->auth_info is supported by
+ * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and
* -EACCES if not.
*/
-static int nfs_verify_authflavors(struct nfs_fs_context *cfg,
+static int nfs_verify_authflavors(struct nfs_fs_context *ctx,
rpc_authflavor_t *server_authlist, unsigned int count)
{
rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
@@ -732,7 +700,7 @@ static int nfs_verify_authflavors(struct nfs_fs_context *cfg,
for (i = 0; i < count; i++) {
flavor = server_authlist[i];
- if (nfs_auth_info_match(&cfg->auth_info, flavor))
+ if (nfs_auth_info_match(&ctx->auth_info, flavor))
goto out;
if (flavor == RPC_AUTH_NULL)
@@ -749,8 +717,8 @@ static int nfs_verify_authflavors(struct nfs_fs_context *cfg,
return -EACCES;
out:
- cfg->selected_flavor = flavor;
- dfprintk(MOUNT, "NFS: using auth flavor %u\n", cfg->selected_flavor);
+ ctx->selected_flavor = flavor;
+ dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor);
return 0;
}
@@ -758,50 +726,50 @@ static int nfs_verify_authflavors(struct nfs_fs_context *cfg,
* Use the remote server's MOUNT service to request the NFS file handle
* corresponding to the provided path.
*/
-static int nfs_request_mount(struct nfs_fs_context *cfg,
+static int nfs_request_mount(struct nfs_fs_context *ctx,
struct nfs_fh *root_fh,
rpc_authflavor_t *server_authlist,
unsigned int *server_authlist_len)
{
struct nfs_mount_request request = {
.sap = (struct sockaddr *)
- &cfg->mount_server.address,
- .dirpath = cfg->nfs_server.export_path,
- .protocol = cfg->mount_server.protocol,
+ &ctx->mount_server.address,
+ .dirpath = ctx->nfs_server.export_path,
+ .protocol = ctx->mount_server.protocol,
.fh = root_fh,
- .noresvport = cfg->flags & NFS_MOUNT_NORESVPORT,
+ .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT,
.auth_flav_len = server_authlist_len,
.auth_flavs = server_authlist,
- .net = cfg->net,
+ .net = ctx->fc.net_ns,
};
int status;
- if (cfg->mount_server.version == 0) {
- switch (cfg->version) {
+ if (ctx->mount_server.version == 0) {
+ switch (ctx->version) {
default:
- cfg->mount_server.version = NFS_MNT3_VERSION;
+ ctx->mount_server.version = NFS_MNT3_VERSION;
break;
case 2:
- cfg->mount_server.version = NFS_MNT_VERSION;
+ ctx->mount_server.version = NFS_MNT_VERSION;
}
}
- request.version = cfg->mount_server.version;
+ request.version = ctx->mount_server.version;
- if (cfg->mount_server.hostname)
- request.hostname = cfg->mount_server.hostname;
+ if (ctx->mount_server.hostname)
+ request.hostname = ctx->mount_server.hostname;
else
- request.hostname = cfg->nfs_server.hostname;
+ request.hostname = ctx->nfs_server.hostname;
/*
* Construct the mount server's address.
*/
- if (cfg->mount_server.address.sa_family == AF_UNSPEC) {
- memcpy(request.sap, &cfg->nfs_server.address,
- cfg->nfs_server.addrlen);
- cfg->mount_server.addrlen = cfg->nfs_server.addrlen;
+ if (ctx->mount_server.address.sa_family == AF_UNSPEC) {
+ memcpy(request.sap, &ctx->nfs_server.address,
+ ctx->nfs_server.addrlen);
+ ctx->mount_server.addrlen = ctx->nfs_server.addrlen;
}
- request.salen = cfg->mount_server.addrlen;
- nfs_set_port(request.sap, &cfg->mount_server.port, 0);
+ request.salen = ctx->mount_server.addrlen;
+ nfs_set_port(request.sap, &ctx->mount_server.port, 0);
/*
* Now ask the mount server to map our export path
@@ -817,20 +785,17 @@ static int nfs_request_mount(struct nfs_fs_context *cfg,
return 0;
}
-static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+static struct nfs_server *nfs_try_mount_request(struct nfs_fs_context *ctx)
{
int status;
unsigned int i;
bool tried_auth_unix = false;
bool auth_null_in_list = false;
struct nfs_server *server = ERR_PTR(-EACCES);
- struct nfs_fs_context *ctx = mount_info->ctx;
rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
unsigned int authlist_len = ARRAY_SIZE(authlist);
- status = nfs_request_mount(ctx, mount_info->mntfh, authlist,
- &authlist_len);
+ status = nfs_request_mount(ctx, ctx->mntfh, authlist, &authlist_len);
if (status)
return ERR_PTR(status);
@@ -844,7 +809,7 @@ static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_inf
ctx->selected_flavor);
if (status)
return ERR_PTR(status);
- return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ return ctx->nfs_mod->rpc_ops->create_server(ctx);
}
/*
@@ -871,7 +836,7 @@ static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_inf
}
dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
ctx->selected_flavor = flavor;
- server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ server = ctx->nfs_mod->rpc_ops->create_server(ctx);
if (!IS_ERR(server))
return server;
}
@@ -887,26 +852,27 @@ static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_inf
/* Last chance! Try AUTH_UNIX */
dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
ctx->selected_flavor = RPC_AUTH_UNIX;
- return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ return ctx->nfs_mod->rpc_ops->create_server(ctx);
}
-struct dentry *nfs_try_mount(int flags, const char *dev_name,
- struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+int nfs_try_get_tree(struct nfs_fs_context *ctx)
{
struct nfs_server *server;
- if (mount_info->ctx->need_mount)
- server = nfs_try_mount_request(mount_info, nfs_mod);
+ if (ctx->need_mount)
+ server = nfs_try_mount_request(ctx);
else
- server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ server = ctx->nfs_mod->rpc_ops->create_server(ctx);
- if (IS_ERR(server))
- return ERR_CAST(server);
+ if (IS_ERR(server)) {
+ errorf("NFS: Couldn't create server");
+ return PTR_ERR(server);
+ }
- return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
+ return nfs_get_tree_common(server, ctx);
}
-EXPORT_SYMBOL_GPL(nfs_try_mount);
+EXPORT_SYMBOL_GPL(nfs_try_get_tree);
+
#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
| NFS_MOUNT_SECURE \
@@ -946,15 +912,11 @@ nfs_compare_remount_data(struct nfs_server *nfss,
return 0;
}
-int
-nfs_remount(struct super_block *sb, int *flags, char *raw_data)
+int nfs_remount(struct super_block *sb, struct fs_context *fc)
{
- int error;
+ struct nfs_fs_context *ctx =
+ container_of(fc, struct nfs_fs_context, fc);
struct nfs_server *nfss = sb->s_fs_info;
- struct nfs_fs_context *ctx;
- struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
- struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
- u32 nfsvers = nfss->nfs_client->rpc_ops->version;
sync_filesystem(sb);
@@ -964,39 +926,9 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
* ones were explicitly specified. Fall back to legacy behavior and
* just return success.
*/
- if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
- (nfsvers <= 3 && (!options || (options->version >= 1 &&
- options->version <= 6))))
+ if (ctx->skip_remount_option_check)
return 0;
- ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
- if (ctx == NULL)
- return -ENOMEM;
-
- /* fill out struct with values from existing mount */
- ctx->flags = nfss->flags;
- ctx->rsize = nfss->rsize;
- ctx->wsize = nfss->wsize;
- ctx->retrans = nfss->client->cl_timeout->to_retries;
- ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
- ctx->acregmin = nfss->acregmin / HZ;
- ctx->acregmax = nfss->acregmax / HZ;
- ctx->acdirmin = nfss->acdirmin / HZ;
- ctx->acdirmax = nfss->acdirmax / HZ;
- ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
- ctx->nfs_server.port = nfss->port;
- ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
- ctx->version = nfsvers;
- ctx->minorversion = nfss->nfs_client->cl_minorversion;
- ctx->net = current->nsproxy->net_ns;
- memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
- ctx->nfs_server.addrlen);
-
- /* overwrite those values with any that were specified */
- error = -EINVAL;
- if (!nfs_parse_mount_options((char *)options, ctx))
- goto out;
-
/*
* noac is a special case. It implies -o sync, but that's not
* necessarily reflected in the mtab options. do_remount_sb
@@ -1004,13 +936,10 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
* remount options, so we have to explicitly reset it.
*/
if (ctx->flags & NFS_MOUNT_NOAC)
- *flags |= SB_SYNCHRONOUS;
+ ctx->fc.sb_flags |= SB_SYNCHRONOUS;
/* compare new mount options with old ones */
- error = nfs_compare_remount_data(nfss, ctx);
-out:
- kfree(ctx);
- return error;
+ return nfs_compare_remount_data(nfss, ctx);
}
EXPORT_SYMBOL_GPL(nfs_remount);
@@ -1037,9 +966,8 @@ static void nfs_initialise_sb(struct super_block *sb)
/*
* Finish setting up an NFS2/3 superblock
*/
-void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
+static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
{
- struct nfs_fs_context *ctx = mount_info->ctx;
struct nfs_server *server = NFS_SB(sb);
sb->s_blocksize_bits = 0;
@@ -1059,15 +987,13 @@ void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
nfs_initialise_sb(sb);
}
-EXPORT_SYMBOL_GPL(nfs_fill_super);
/*
* Finish setting up a cloned NFS2/3/4 superblock
*/
-static void nfs_clone_super(struct super_block *sb,
- struct nfs_mount_info *mount_info)
+static void nfs_clone_super(struct super_block *sb, struct nfs_fs_context *ctx)
{
- const struct super_block *old_sb = mount_info->cloned->sb;
+ const struct super_block *old_sb = ctx->clone_data.sb;
struct nfs_server *server = NFS_SB(sb);
sb->s_blocksize_bits = old_sb->s_blocksize_bits;
@@ -1087,13 +1013,14 @@ static void nfs_clone_super(struct super_block *sb,
nfs_initialise_sb(sb);
}
-static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
+static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b,
+ const struct nfs_fs_context *ctx)
{
const struct nfs_server *a = s->s_fs_info;
const struct rpc_clnt *clnt_a = a->client;
const struct rpc_clnt *clnt_b = b->client;
- if ((s->s_flags & NFS_SB_MASK) != (flags & NFS_SB_MASK))
+ if ((s->s_flags & NFS_SB_MASK) != (ctx->fc.sb_flags & NFS_SB_MASK))
goto Ebusy;
if (a->nfs_client != b->nfs_client)
goto Ebusy;
@@ -1119,18 +1046,13 @@ static int nfs_compare_mount_options(const struct super_block *s, const struct n
return 0;
}
-struct nfs_sb_mountdata {
- struct nfs_server *server;
- int mntflags;
-};
-
-static int nfs_set_super(struct super_block *s, void *data)
+static int nfs_set_super(struct super_block *s, struct fs_context *fc)
{
- struct nfs_sb_mountdata *sb_mntdata = data;
- struct nfs_server *server = sb_mntdata->server;
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+ struct nfs_server *server = ctx->server;
int ret;
- s->s_flags = sb_mntdata->mntflags;
+ s->s_flags = ctx->fc.sb_flags;
s->s_fs_info = server;
s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
ret = set_anon_super(s, server);
@@ -1181,11 +1103,10 @@ static int nfs_compare_super_address(struct nfs_server *server1,
return 1;
}
-static int nfs_compare_super(struct super_block *sb, void *data)
+static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
{
- struct nfs_sb_mountdata *sb_mntdata = data;
- struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
- int mntflags = sb_mntdata->mntflags;
+ struct nfs_fs_context *ctx = container_of(fc, struct nfs_fs_context, fc);
+ struct nfs_server *server = ctx->server, *old = NFS_SB(sb);
if (!nfs_compare_super_address(old, server))
return 0;
@@ -1194,13 +1115,12 @@ static int nfs_compare_super(struct super_block *sb, void *data)
return 0;
if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
return 0;
- return nfs_compare_mount_options(sb, server, mntflags);
+ return nfs_compare_mount_options(sb, server, ctx);
}
#ifdef CONFIG_NFS_FSCACHE
static void nfs_get_cache_cookie(struct super_block *sb,
- struct nfs_fs_context *ctx,
- struct nfs_clone_mount *cloned)
+ struct nfs_fs_context *ctx)
{
struct nfs_server *nfss = NFS_SB(sb);
char *uniq = NULL;
@@ -1209,77 +1129,72 @@ static void nfs_get_cache_cookie(struct super_block *sb,
nfss->fscache_key = NULL;
nfss->fscache = NULL;
- if (ctx) {
+ if (!ctx)
+ return;
+
+ if (ctx->clone_data.cloned) {
+ struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
+ if (!(mnt_s->options & NFS_OPTION_FSCACHE))
+ return;
+ if (mnt_s->fscache_key) {
+ uniq = mnt_s->fscache_key->key.uniquifier;
+ ulen = mnt_s->fscache_key->key.uniq_len;
+ }
+ } else {
if (!(ctx->options & NFS_OPTION_FSCACHE))
return;
if (ctx->fscache_uniq) {
uniq = ctx->fscache_uniq;
ulen = strlen(ctx->fscache_uniq);
}
- } else if (cloned) {
- struct nfs_server *mnt_s = NFS_SB(cloned->sb);
- if (!(mnt_s->options & NFS_OPTION_FSCACHE))
- return;
- if (mnt_s->fscache_key) {
- uniq = mnt_s->fscache_key->key.uniquifier;
- ulen = mnt_s->fscache_key->key.uniq_len;
- };
- } else
return;
+ }
nfs_fscache_get_super_cookie(sb, uniq, ulen);
}
#else
static void nfs_get_cache_cookie(struct super_block *sb,
- struct nfs_fs_context *parsed,
- struct nfs_clone_mount *cloned)
+ struct nfs_fs_context *ctx)
{
}
#endif
-int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
- struct nfs_mount_info *mount_info)
+int nfs_set_sb_security(struct super_block *sb, struct nfs_fs_context *ctx)
{
int error;
unsigned long kflags = 0, kflags_out = 0;
- if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
+
+ if (NFS_SB(sb)->caps & NFS_CAP_SECURITY_LABEL)
kflags |= SECURITY_LSM_NATIVE_LABELS;
- error = security_sb_set_mnt_opts(s, &mount_info->ctx->lsm_opts,
- kflags, &kflags_out);
+ error = security_sb_set_mnt_opts(sb, ctx->fc.security,
+ kflags, &kflags_out);
if (error)
goto err;
- if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
- !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
- NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
+ if (NFS_SB(sb)->caps & NFS_CAP_SECURITY_LABEL &&
+ !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
+ NFS_SB(sb)->caps &= ~NFS_CAP_SECURITY_LABEL;
err:
return error;
}
EXPORT_SYMBOL_GPL(nfs_set_sb_security);
-int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
- struct nfs_mount_info *mount_info)
+int nfs_clone_sb_security(struct super_block *sb, struct nfs_fs_context *ctx)
{
/* clone any lsm security options from the parent to the new sb */
- if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
+ if (d_inode(ctx->fc.root)->i_op !=
+ NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops)
return -ESTALE;
- return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
+ return security_sb_clone_mnt_opts(ctx->clone_data.sb, sb);
}
EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
-struct dentry *nfs_fs_mount_common(struct nfs_server *server,
- int flags, const char *dev_name,
- struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+int nfs_get_tree_common(struct nfs_server *server, struct nfs_fs_context *ctx)
{
struct super_block *s;
struct dentry *mntroot = ERR_PTR(-ENOMEM);
- int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
- struct nfs_sb_mountdata sb_mntdata = {
- .mntflags = flags,
- .server = server,
- };
+ int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super;
int error;
if (server->flags & NFS_MOUNT_UNSHARED)
@@ -1287,16 +1202,19 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,
/* -o noac implies -o sync */
if (server->flags & NFS_MOUNT_NOAC)
- sb_mntdata.mntflags |= SB_SYNCHRONOUS;
+ ctx->fc.sb_flags |= SB_SYNCHRONOUS;
- if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
- if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS)
- sb_mntdata.mntflags |= SB_SYNCHRONOUS;
+ if (ctx->clone_data.cloned && ctx->clone_data.sb != NULL)
+ if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS)
+ ctx->fc.sb_flags |= SB_SYNCHRONOUS;
/* Get a superblock - note that we may end up sharing one that already exists */
- s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
+ ctx->server = server;
+ s = sget_fc(&ctx->fc, compare_super, nfs_set_super);
+ ctx->server = NULL;
if (IS_ERR(s)) {
- mntroot = ERR_CAST(s);
+ error = PTR_ERR(s);
+ errorf("NFS: Couldn't get superblock");
goto out_err_nosb;
}
@@ -1316,22 +1234,28 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,
if (!s->s_root) {
/* initial superblock/root creation */
- mount_info->fill_super(s, mount_info);
- nfs_get_cache_cookie(s, mount_info->ctx, mount_info->cloned);
+ if (ctx->clone_data.sb)
+ nfs_clone_super(s, ctx);
+ else
+ nfs_fill_super(s, ctx);
+ nfs_get_cache_cookie(s, ctx);
}
- mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
- if (IS_ERR(mntroot))
+ error = nfs_get_root(s, ctx);
+ if (error < 0) {
+ errorf("NFS: Couldn't get root dentry");
goto error_splat_super;
+ }
- error = mount_info->set_security(s, mntroot, mount_info);
+ error = ctx->set_security(s, ctx);
if (error)
goto error_splat_root;
s->s_flags |= SB_ACTIVE;
+ error = 0;
out:
- return mntroot;
+ return error;
out_err_nosb:
nfs_free_server(server);
@@ -1339,53 +1263,11 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,
error_splat_root:
dput(mntroot);
- mntroot = ERR_PTR(error);
error_splat_super:
deactivate_locked_super(s);
goto out;
}
-EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
-
-struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data)
-{
- struct nfs_mount_info mount_info = {
- .fill_super = nfs_fill_super,
- .set_security = nfs_set_sb_security,
- };
- struct dentry *mntroot = ERR_PTR(-ENOMEM);
- struct nfs_subversion *nfs_mod;
- int error;
-
- mount_info.ctx = nfs_alloc_parsed_mount_data();
- mount_info.mntfh = nfs_alloc_fhandle();
- if (mount_info.ctx == NULL || mount_info.mntfh == NULL)
- goto out;
-
- /* Validate the mount data */
- error = nfs_validate_mount_data(fs_type, raw_data, mount_info.ctx, mount_info.mntfh, dev_name);
- if (error == NFS_TEXT_DATA)
- error = nfs_validate_text_mount_data(raw_data, mount_info.ctx, dev_name);
- if (error < 0) {
- mntroot = ERR_PTR(error);
- goto out;
- }
-
- nfs_mod = get_nfs_version(mount_info.ctx->version);
- if (IS_ERR(nfs_mod)) {
- mntroot = ERR_CAST(nfs_mod);
- goto out;
- }
-
- mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
-
- put_nfs_version(nfs_mod);
-out:
- nfs_free_parsed_mount_data(mount_info.ctx);
- nfs_free_fhandle(mount_info.mntfh);
- return mntroot;
-}
-EXPORT_SYMBOL_GPL(nfs_fs_mount);
+EXPORT_SYMBOL_GPL(nfs_get_tree_common);
/*
* Destroy an NFS2/3 superblock
@@ -1404,41 +1286,6 @@ void nfs_kill_super(struct super_block *s)
}
EXPORT_SYMBOL_GPL(nfs_kill_super);
-/*
- * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
- */
-static struct dentry *
-nfs_xdev_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
-{
- struct nfs_clone_mount *data = raw_data;
- struct nfs_mount_info mount_info = {
- .fill_super = nfs_clone_super,
- .set_security = nfs_clone_sb_security,
- .cloned = data,
- };
- struct nfs_server *server;
- struct dentry *mntroot = ERR_PTR(-ENOMEM);
- struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
-
- dprintk("--> nfs_xdev_mount()\n");
-
- mount_info.mntfh = mount_info.cloned->fh;
-
- /* create a new volume representation */
- server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
-
- if (IS_ERR(server))
- mntroot = ERR_CAST(server);
- else
- mntroot = nfs_fs_mount_common(server, flags,
- dev_name, &mount_info, nfs_mod);
-
- dprintk("<-- nfs_xdev_mount() = %ld\n",
- IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
- return mntroot;
-}
-
#if IS_ENABLED(CONFIG_NFS_V4)
/*
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index b28c83475ee8..71697103a887 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1542,6 +1542,7 @@ struct nfs_subversion;
struct nfs_mount_info;
struct nfs_client_initdata;
struct nfs_pageio_descriptor;
+struct nfs_fs_context;
/*
* RPC procedure vector for NFSv2/NFSv3 demuxing
@@ -1556,10 +1557,10 @@ struct nfs_rpc_ops {
int (*getroot) (struct nfs_server *, struct nfs_fh *,
struct nfs_fsinfo *);
+ int (*get_tree)(struct nfs_fs_context *);
struct vfsmount *(*submount) (struct nfs_server *, struct dentry *,
struct nfs_fh *, struct nfs_fattr *);
- struct dentry *(*try_mount) (int, const char *, struct nfs_mount_info *,
- struct nfs_subversion *);
+ int (*try_get_tree) (struct nfs_fs_context *);
int (*getattr) (struct nfs_server *, struct nfs_fh *,
struct nfs_fattr *, struct nfs4_label *);
int (*setattr) (struct dentry *, struct nfs_fattr *,
@@ -1620,7 +1621,7 @@ struct nfs_rpc_ops {
struct nfs_client *(*init_client) (struct nfs_client *,
const struct nfs_client_initdata *);
void (*free_client) (struct nfs_client *);
- struct nfs_server *(*create_server)(struct nfs_mount_info *, struct nfs_subversion *);
+ struct nfs_server *(*create_server)(struct nfs_fs_context *);
struct nfs_server *(*clone_server)(struct nfs_server *, struct nfs_fh *,
struct nfs_fattr *, rpc_authflavor_t);
};
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