/*
- * include/linux/nfsd/nfsfh.h
- *
* This file describes the layout of the file handles as passed
* over the wire.
*
- * Earlier versions of knfsd used to sign file handles using keyed MD5
- * or SHA. I've removed this code, because it doesn't give you more
- * security than blocking external access to port 2049 on your firewall.
- *
* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
*/
#ifndef _LINUX_NFSD_FH_H
#define _LINUX_NFSD_FH_H
-#include <asm/types.h>
-#ifdef __KERNEL__
-# include <linux/types.h>
-# include <linux/string.h>
-# include <linux/fs.h>
-#endif
-#include <linux/nfsd/const.h>
-#include <linux/nfsd/debug.h>
+#include <linux/types.h>
+#include <linux/nfs.h>
+#include <linux/nfs2.h>
+#include <linux/nfs3.h>
+#include <linux/nfs4.h>
/*
* This is the old "dentry style" Linux NFSv2 file handle.
};
/*
- * This is the new flexible, extensible style NFSv2/v3 file handle.
+ * This is the new flexible, extensible style NFSv2/v3/v4 file handle.
* by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
*
- * The file handle is seens as a list of 4byte words.
- * The first word contains a version number (1) and four descriptor bytes
+ * The file handle starts with a sequence of four-byte words.
+ * The first word contains a version number (1) and three descriptor bytes
* that tell how the remaining 3 variable length fields should be handled.
* These three bytes are auth_type, fsid_type and fileid_type.
*
- * All 4byte values are in host-byte-order.
+ * All four-byte values are in host-byte-order.
*
- * The auth_type field specifies how the filehandle can be authenticated
- * This might allow a file to be confirmed to be in a writable part of a
- * filetree without checking the path from it upto the root.
- * Current values:
- * 0 - No authentication. fb_auth is 0 bytes long
- * Possible future values:
- * 1 - 4 bytes taken from MD5 hash of the remainer of the file handle
- * prefixed by a secret and with the important export flags.
+ * The auth_type field is deprecated and must be set to 0.
*
* The fsid_type identifies how the filesystem (or export point) is
* encoded.
* 1 - 4 byte user specified identifier
* 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
* 3 - 4 byte device id, encoded for user-space, 4 byte inode number
+ * 4 - 4 byte inode number and 4 byte uuid
+ * 5 - 8 byte uuid
+ * 6 - 16 byte uuid
+ * 7 - 8 byte inode number and 16 byte uuid
*
* The fileid_type identified how the file within the filesystem is encoded.
- * This is (will be) passed to, and set by, the underlying filesystem if it supports
- * filehandle operations. The filesystem must not use the value '0' or '0xff' and may
- * only use the values 1 and 2 as defined below:
- * Current values:
- * 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes.
- * 1 - 32bit inode number, 32 bit generation number.
- * 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number.
- *
+ * The values for this field are filesystem specific, exccept that
+ * filesystems must not use the values '0' or '0xff'. 'See enum fid_type'
+ * in include/linux/exportfs.h for currently registered values.
*/
struct nfs_fhbase_new {
__u8 fb_version; /* == 1, even => nfs_fhbase_old */
#define fh_fsid_type fh_base.fh_new.fb_fsid_type
#define fh_auth_type fh_base.fh_new.fb_auth_type
#define fh_fileid_type fh_base.fh_new.fb_fileid_type
-#define fh_auth fh_base.fh_new.fb_auth
#define fh_fsid fh_base.fh_new.fb_auth
-#ifdef __KERNEL__
-
-static inline __u32 ino_t_to_u32(ino_t ino)
-{
- return (__u32) ino;
-}
-
-static inline ino_t u32_to_ino_t(__u32 uino)
-{
- return (ino_t) uino;
-}
-
-/*
- * This is the internal representation of an NFS handle used in knfsd.
- * pre_mtime/post_version will be used to support wcc_attr's in NFSv3.
- */
-typedef struct svc_fh {
- struct knfsd_fh fh_handle; /* FH data */
- struct dentry * fh_dentry; /* validated dentry */
- struct svc_export * fh_export; /* export pointer */
- int fh_maxsize; /* max size for fh_handle */
-
- unsigned char fh_locked; /* inode locked by us */
-
-#ifdef CONFIG_NFSD_V3
- unsigned char fh_post_saved; /* post-op attrs saved */
- unsigned char fh_pre_saved; /* pre-op attrs saved */
-
- /* Pre-op attributes saved during fh_lock */
- __u64 fh_pre_size; /* size before operation */
- struct timespec fh_pre_mtime; /* mtime before oper */
- struct timespec fh_pre_ctime; /* ctime before oper */
-
- /* Post-op attributes saved in fh_unlock */
- struct kstat fh_post_attr; /* full attrs after operation */
-#endif /* CONFIG_NFSD_V3 */
-
-} svc_fh;
-
-enum nfsd_fsid {
- FSID_DEV = 0,
- FSID_NUM,
- FSID_MAJOR_MINOR,
- FSID_ENCODE_DEV,
- FSID_UUID4_INUM,
- FSID_UUID8,
- FSID_UUID16,
- FSID_UUID16_INUM,
-};
-
-enum fsid_source {
- FSIDSOURCE_DEV,
- FSIDSOURCE_FSID,
- FSIDSOURCE_UUID,
-};
-extern enum fsid_source fsid_source(struct svc_fh *fhp);
-
-
-/* This might look a little large to "inline" but in all calls except
- * one, 'vers' is constant so moste of the function disappears.
- */
-static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
- u32 fsid, unsigned char *uuid)
-{
- u32 *up;
- switch(vers) {
- case FSID_DEV:
- fsidv[0] = htonl((MAJOR(dev)<<16) |
- MINOR(dev));
- fsidv[1] = ino_t_to_u32(ino);
- break;
- case FSID_NUM:
- fsidv[0] = fsid;
- break;
- case FSID_MAJOR_MINOR:
- fsidv[0] = htonl(MAJOR(dev));
- fsidv[1] = htonl(MINOR(dev));
- fsidv[2] = ino_t_to_u32(ino);
- break;
-
- case FSID_ENCODE_DEV:
- fsidv[0] = new_encode_dev(dev);
- fsidv[1] = ino_t_to_u32(ino);
- break;
-
- case FSID_UUID4_INUM:
- /* 4 byte fsid and inode number */
- up = (u32*)uuid;
- fsidv[0] = ino_t_to_u32(ino);
- fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
- break;
-
- case FSID_UUID8:
- /* 8 byte fsid */
- up = (u32*)uuid;
- fsidv[0] = up[0] ^ up[2];
- fsidv[1] = up[1] ^ up[3];
- break;
-
- case FSID_UUID16:
- /* 16 byte fsid - NFSv3+ only */
- memcpy(fsidv, uuid, 16);
- break;
-
- case FSID_UUID16_INUM:
- /* 8 byte inode and 16 byte fsid */
- *(u64*)fsidv = (u64)ino;
- memcpy(fsidv+2, uuid, 16);
- break;
- default: BUG();
- }
-}
-
-static inline int key_len(int type)
-{
- switch(type) {
- case FSID_DEV: return 8;
- case FSID_NUM: return 4;
- case FSID_MAJOR_MINOR: return 12;
- case FSID_ENCODE_DEV: return 8;
- case FSID_UUID4_INUM: return 8;
- case FSID_UUID8: return 8;
- case FSID_UUID16: return 16;
- case FSID_UUID16_INUM: return 24;
- default: return 0;
- }
-}
-
-/*
- * Shorthand for dprintk()'s
- */
-extern char * SVCFH_fmt(struct svc_fh *fhp);
-
-/*
- * Function prototypes
- */
-__be32 fh_verify(struct svc_rqst *, struct svc_fh *, int, int);
-__be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
-__be32 fh_update(struct svc_fh *);
-void fh_put(struct svc_fh *);
-
-static __inline__ struct svc_fh *
-fh_copy(struct svc_fh *dst, struct svc_fh *src)
-{
- WARN_ON(src->fh_dentry || src->fh_locked);
-
- *dst = *src;
- return dst;
-}
-
-static __inline__ struct svc_fh *
-fh_init(struct svc_fh *fhp, int maxsize)
-{
- memset(fhp, 0, sizeof(*fhp));
- fhp->fh_maxsize = maxsize;
- return fhp;
-}
-
-#ifdef CONFIG_NFSD_V3
-/*
- * Fill in the pre_op attr for the wcc data
- */
-static inline void
-fill_pre_wcc(struct svc_fh *fhp)
-{
- struct inode *inode;
-
- inode = fhp->fh_dentry->d_inode;
- if (!fhp->fh_pre_saved) {
- fhp->fh_pre_mtime = inode->i_mtime;
- fhp->fh_pre_ctime = inode->i_ctime;
- fhp->fh_pre_size = inode->i_size;
- fhp->fh_pre_saved = 1;
- }
-}
-
-extern void fill_post_wcc(struct svc_fh *);
-#else
-#define fill_pre_wcc(ignored)
-#define fill_post_wcc(notused)
-#endif /* CONFIG_NFSD_V3 */
-
-
-/*
- * Lock a file handle/inode
- * NOTE: both fh_lock and fh_unlock are done "by hand" in
- * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
- * so, any changes here should be reflected there.
- */
-
-static inline void
-fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
-{
- struct dentry *dentry = fhp->fh_dentry;
- struct inode *inode;
-
- dfprintk(FILEOP, "nfsd: fh_lock(%s) locked = %d\n",
- SVCFH_fmt(fhp), fhp->fh_locked);
-
- BUG_ON(!dentry);
-
- if (fhp->fh_locked) {
- printk(KERN_WARNING "fh_lock: %s/%s already locked!\n",
- dentry->d_parent->d_name.name, dentry->d_name.name);
- return;
- }
-
- inode = dentry->d_inode;
- mutex_lock_nested(&inode->i_mutex, subclass);
- fill_pre_wcc(fhp);
- fhp->fh_locked = 1;
-}
-
-static inline void
-fh_lock(struct svc_fh *fhp)
-{
- fh_lock_nested(fhp, I_MUTEX_NORMAL);
-}
-
-/*
- * Unlock a file handle/inode
- */
-static inline void
-fh_unlock(struct svc_fh *fhp)
-{
- BUG_ON(!fhp->fh_dentry);
-
- if (fhp->fh_locked) {
- fill_post_wcc(fhp);
- mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
- fhp->fh_locked = 0;
- }
-}
-#endif /* __KERNEL__ */
-
+/* Do not use, provided for userspace compatiblity. */
+#define fh_auth fh_base.fh_new.fb_auth
#endif /* _LINUX_NFSD_FH_H */
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