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knfsd: exportfs: add procedural interface for NFSD 

Currently NFSD calls directly into filesystems through the export_operations
structure.  I plan to change this interface in various ways in later patches,
and want to avoid the export of the default operations to NFSD, so this patch
adds two simple exportfs_encode_fh/exportfs_decode_fh helpers for NFSD to call
instead of poking into exportfs guts.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2007-07-17 04:04:30 -07:00 committed by Linus Torvalds
parent 5ca2960733
commit d37065cd6d
3 changed files with 33 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
fs/exportfs/expfs.c
View File

@ -3,6 +3,7 @@
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/namei.h>
struct export_operations export_op_default;
@ -468,6 +469,26 @@ static struct dentry *export_decode_fh(struct super_block *sb, __u32 *fh, int fh
acceptable, context);
}
int exportfs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
int connectable)
{
struct export_operations *nop = dentry->d_sb->s_export_op;
return CALL(nop, encode_fh)(dentry, fh, max_len, connectable);
}
EXPORT_SYMBOL_GPL(exportfs_encode_fh);
struct dentry *exportfs_decode_fh(struct vfsmount *mnt, __u32 *fh, int fh_len,
int fileid_type, int (*acceptable)(void *, struct dentry *),
void *context)
{
struct export_operations *nop = mnt->mnt_sb->s_export_op;
return CALL(nop, decode_fh)(mnt->mnt_sb, fh, fh_len, fileid_type,
acceptable, context);
}
EXPORT_SYMBOL_GPL(exportfs_decode_fh);
struct export_operations export_op_default = {
.decode_fh = export_decode_fh,
.encode_fh = export_encode_fh,
@ -477,7 +498,6 @@ struct export_operations export_op_default = {
.get_dentry = get_dentry,
};
EXPORT_SYMBOL(export_op_default);
EXPORT_SYMBOL(find_exported_dentry);
MODULE_LICENSE("GPL");

18
fs/nfsd/nfsfh.c
View File

@ -28,10 +28,6 @@
static int nfsd_nr_verified;
static int nfsd_nr_put;
extern struct export_operations export_op_default;
#define CALL(ops,fun) ((ops->fun)?(ops->fun):export_op_default.fun)
/*
* our acceptability function.
* if NOSUBTREECHECK, accept anything
@ -212,11 +208,9 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
if (fileid_type == 0)
dentry = dget(exp->ex_dentry);
else {
struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op;
dentry = CALL(nop,decode_fh)(exp->ex_mnt->mnt_sb,
datap, data_left,
fileid_type,
nfsd_acceptable, exp);
dentry = exportfs_decode_fh(exp->ex_mnt, datap,
data_left, fileid_type,
nfsd_acceptable, exp);
}
if (dentry == NULL)
goto out;
@ -287,15 +281,13 @@ out:
static inline int _fh_update(struct dentry *dentry, struct svc_export *exp,
__u32 *datap, int *maxsize)
{
struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op;
if (dentry == exp->ex_dentry) {
*maxsize = 0;
return 0;
}
return CALL(nop,encode_fh)(dentry, datap, maxsize,
!(exp->ex_flags&NFSEXP_NOSUBTREECHECK));
return exportfs_encode_fh(dentry, datap, maxsize,
!(exp->ex_flags & NFSEXP_NOSUBTREECHECK));
}
/*

7
include/linux/exportfs.h
View File

@ -5,6 +5,7 @@
struct dentry;
struct super_block;
struct vfsmount;
/**
@ -116,4 +117,10 @@ extern struct dentry *find_exported_dentry(struct super_block *sb, void *obj,
void *parent, int (*acceptable)(void *context, struct dentry *de),
void *context);
extern int exportfs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
int connectable);
extern struct dentry *exportfs_decode_fh(struct vfsmount *mnt, __u32 *fh,
int fh_len, int fileid_type, int (*acceptable)(void *, struct dentry *),
void *context);
#endif /* LINUX_EXPORTFS_H */