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authorDavid Howells <dhowells@redhat.com>2019-12-10 07:31:13 -0500
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2020-01-15 10:15:17 -0500
commitf2aedb713c284429987dc66c7aaf38decfc8da2a (patch)
tree01978da583f0b64bb524dde8825dbaeb0934c615 /fs/nfs/internal.h
parente38bb238ed8ce280a217629294ba51dc217c5a2c (diff)
NFS: Add fs_context support.
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. [AV -- retrans is u32, not string] [SM -- Renamed cfg to ctx in a few functions in an earlier patch] [SM -- Moved fs_context mount option parsing to an earlier patch] [SM -- Moved fs_context error logging to a later patch] [SM -- Fixed printks in nfs4_try_get_tree() and nfs4_get_referral_tree()] [SM -- Added is_remount_fc() helper] [SM -- Deferred some refactoring to a later patch] [SM -- Fixed referral mounts, which were broken in the original patch] [SM -- Fixed leak of nfs_fattr when fs_context is freed] Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/internal.h')
-rw-r--r--fs/nfs/internal.h74
1 files changed, 33 insertions, 41 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 003c2b8eb1e6..1cd09df9e0b5 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -4,7 +4,7 @@
*/
#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>
@@ -16,6 +16,7 @@
extern const struct export_operations nfs_export_ops;
struct nfs_string;
+struct nfs_pageio_descriptor;
static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
{
@@ -34,12 +35,13 @@ static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
struct nfs_clone_mount {
const struct super_block *sb;
- const struct dentry *dentry;
+ struct dentry *dentry;
char *hostname;
char *mnt_path;
struct sockaddr *addr;
size_t addrlen;
rpc_authflavor_t authflavor;
+ struct nfs_fattr *fattr;
};
/*
@@ -78,10 +80,23 @@ struct nfs_client_initdata {
const struct cred *cred;
};
+struct nfs_mount_info {
+ unsigned int inherited_bsize;
+ struct nfs_fs_context *ctx;
+ struct nfs_clone_mount *cloned;
+ struct nfs_server *server;
+ struct nfs_fh *mntfh;
+ struct nfs_subversion *nfs_mod;
+};
+
/*
* In-kernel mount arguments
*/
struct nfs_fs_context {
+ bool internal;
+ bool skip_reconfig_option_check;
+ bool need_mount;
+ bool sloppy;
unsigned int flags; /* NFS{,4}_MOUNT_* flags */
unsigned int rsize, wsize;
unsigned int timeo, retrans;
@@ -98,8 +113,6 @@ struct nfs_fs_context {
char *fscache_uniq;
unsigned short protofamily;
unsigned short mountfamily;
- bool need_mount;
- bool sloppy;
struct {
union {
@@ -124,14 +137,23 @@ struct nfs_fs_context {
int port;
unsigned short protocol;
unsigned short nconnect;
+ unsigned short export_path_len;
} nfs_server;
void *lsm_opts;
struct net *net;
char buf[32]; /* Parse buffer */
+
+ struct nfs_mount_info mount_info;
+ struct nfs_clone_mount clone_data;
};
+static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
+{
+ return fc->fs_private;
+}
+
/* mount_clnt.c */
struct nfs_mount_request {
struct sockaddr *sap;
@@ -147,15 +169,6 @@ struct nfs_mount_request {
struct net *net;
};
-struct nfs_mount_info {
- unsigned int inherited_bsize;
- struct nfs_fs_context *ctx;
- struct nfs_clone_mount *cloned;
- struct nfs_server *server;
- struct nfs_fh *mntfh;
- struct nfs_subversion *nfs_mod;
-};
-
extern int nfs_mount(struct nfs_mount_request *info);
extern void nfs_umount(const struct nfs_mount_request *info);
@@ -235,22 +248,8 @@ static inline void nfs_fs_proc_exit(void)
extern const struct svc_version nfs4_callback_version1;
extern const 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);
+/* fs_context.c */
+extern struct file_system_type nfs_fs_type;
/* pagelist.c */
extern int __init nfs_init_nfspagecache(void);
@@ -411,14 +410,9 @@ extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
/* super.c */
extern const struct super_operations nfs_sops;
-extern struct file_system_type nfs_fs_type;
-extern struct file_system_type nfs_prepared_fs_type;
-#if IS_ENABLED(CONFIG_NFS_V4)
-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 dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
+int nfs_try_get_tree(struct fs_context *);
+int nfs_get_tree_common(struct fs_context *);
void nfs_kill_super(struct super_block *);
extern struct rpc_stat nfs_rpcstat;
@@ -446,10 +440,8 @@ static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
extern char *nfs_path(char **p, struct dentry *dentry,
char *buffer, ssize_t buflen, unsigned flags);
extern struct vfsmount *nfs_d_automount(struct path *path);
-struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
- struct nfs_fh *, struct nfs_fattr *);
-struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
- struct nfs_fattr *, rpc_authflavor_t);
+int nfs_submount(struct fs_context *, struct nfs_server *);
+int nfs_do_submount(struct fs_context *);
/* getroot.c */
extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
@@ -476,7 +468,7 @@ 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_reconfigure(struct fs_context *);
/* write.c */
extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,