From d37065cd6d6bbe98fd4be14d6c9e64c0bfa124c5 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 17 Jul 2007 04:04:30 -0700 Subject: [PATCH] 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 Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/exportfs/expfs.c | 22 +++++++++++++++++++++- fs/nfsd/nfsfh.c | 18 +++++------------- include/linux/exportfs.h | 7 +++++++ 3 files changed, 33 insertions(+), 14 deletions(-) diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index dd132bb7b8..db86006956 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -3,6 +3,7 @@ #include #include #include +#include #include 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"); diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c index 0108d3ec1c..ecf9c361b3 100644 --- a/fs/nfsd/nfsfh.c +++ b/fs/nfsd/nfsfh.c @@ -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)); } /* diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h index fdc306fbba..8872fe8392 100644 --- a/include/linux/exportfs.h +++ b/include/linux/exportfs.h @@ -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 */ -- 2.39.5