366 строки
9.4 KiB
C
366 строки
9.4 KiB
C
/*
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* include/linux/nfsd/nfsfh.h
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*
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* This file describes the layout of the file handles as passed
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* over the wire.
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*
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* Earlier versions of knfsd used to sign file handles using keyed MD5
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* or SHA. I've removed this code, because it doesn't give you more
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* security than blocking external access to port 2049 on your firewall.
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*
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* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _LINUX_NFSD_FH_H
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#define _LINUX_NFSD_FH_H
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# include <linux/types.h>
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#ifdef __KERNEL__
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# include <linux/string.h>
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# include <linux/fs.h>
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#endif
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#include <linux/nfsd/const.h>
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#include <linux/nfsd/debug.h>
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/*
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* This is the old "dentry style" Linux NFSv2 file handle.
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*
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* The xino and xdev fields are currently used to transport the
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* ino/dev of the exported inode.
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*/
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struct nfs_fhbase_old {
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__u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */
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__u32 fb_ino; /* our inode number */
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__u32 fb_dirino; /* dir inode number, 0 for directories */
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__u32 fb_dev; /* our device */
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__u32 fb_xdev;
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__u32 fb_xino;
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__u32 fb_generation;
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};
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/*
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* This is the new flexible, extensible style NFSv2/v3 file handle.
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* by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
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*
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* The file handle is seens as a list of 4byte words.
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* The first word contains a version number (1) and four descriptor bytes
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* that tell how the remaining 3 variable length fields should be handled.
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* These three bytes are auth_type, fsid_type and fileid_type.
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*
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* All 4byte values are in host-byte-order.
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*
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* The auth_type field specifies how the filehandle can be authenticated
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* This might allow a file to be confirmed to be in a writable part of a
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* filetree without checking the path from it upto the root.
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* Current values:
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* 0 - No authentication. fb_auth is 0 bytes long
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* Possible future values:
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* 1 - 4 bytes taken from MD5 hash of the remainer of the file handle
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* prefixed by a secret and with the important export flags.
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*
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* The fsid_type identifies how the filesystem (or export point) is
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* encoded.
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* Current values:
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* 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
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* NOTE: we cannot use the kdev_t device id value, because kdev_t.h
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* says we mustn't. We must break it up and reassemble.
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* 1 - 4 byte user specified identifier
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* 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
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* 3 - 4 byte device id, encoded for user-space, 4 byte inode number
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* 4 - 4 byte inode number and 4 byte uuid
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* 5 - 8 byte uuid
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* 6 - 16 byte uuid
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* 7 - 8 byte inode number and 16 byte uuid
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*
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* The fileid_type identified how the file within the filesystem is encoded.
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* This is (will be) passed to, and set by, the underlying filesystem if it supports
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* filehandle operations. The filesystem must not use the value '0' or '0xff' and may
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* only use the values 1 and 2 as defined below:
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* Current values:
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* 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes.
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* 1 - 32bit inode number, 32 bit generation number.
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* 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number.
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*
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*/
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struct nfs_fhbase_new {
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__u8 fb_version; /* == 1, even => nfs_fhbase_old */
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__u8 fb_auth_type;
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__u8 fb_fsid_type;
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__u8 fb_fileid_type;
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__u32 fb_auth[1];
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/* __u32 fb_fsid[0]; floating */
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/* __u32 fb_fileid[0]; floating */
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};
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struct knfsd_fh {
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unsigned int fh_size; /* significant for NFSv3.
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* Points to the current size while building
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* a new file handle
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*/
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union {
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struct nfs_fhbase_old fh_old;
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__u32 fh_pad[NFS4_FHSIZE/4];
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struct nfs_fhbase_new fh_new;
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} fh_base;
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};
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#define ofh_dcookie fh_base.fh_old.fb_dcookie
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#define ofh_ino fh_base.fh_old.fb_ino
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#define ofh_dirino fh_base.fh_old.fb_dirino
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#define ofh_dev fh_base.fh_old.fb_dev
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#define ofh_xdev fh_base.fh_old.fb_xdev
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#define ofh_xino fh_base.fh_old.fb_xino
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#define ofh_generation fh_base.fh_old.fb_generation
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#define fh_version fh_base.fh_new.fb_version
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#define fh_fsid_type fh_base.fh_new.fb_fsid_type
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#define fh_auth_type fh_base.fh_new.fb_auth_type
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#define fh_fileid_type fh_base.fh_new.fb_fileid_type
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#define fh_auth fh_base.fh_new.fb_auth
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#define fh_fsid fh_base.fh_new.fb_auth
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#ifdef __KERNEL__
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static inline __u32 ino_t_to_u32(ino_t ino)
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{
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return (__u32) ino;
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}
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static inline ino_t u32_to_ino_t(__u32 uino)
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{
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return (ino_t) uino;
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}
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/*
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* This is the internal representation of an NFS handle used in knfsd.
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* pre_mtime/post_version will be used to support wcc_attr's in NFSv3.
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*/
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typedef struct svc_fh {
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struct knfsd_fh fh_handle; /* FH data */
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struct dentry * fh_dentry; /* validated dentry */
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struct svc_export * fh_export; /* export pointer */
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int fh_maxsize; /* max size for fh_handle */
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unsigned char fh_locked; /* inode locked by us */
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#ifdef CONFIG_NFSD_V3
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unsigned char fh_post_saved; /* post-op attrs saved */
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unsigned char fh_pre_saved; /* pre-op attrs saved */
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/* Pre-op attributes saved during fh_lock */
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__u64 fh_pre_size; /* size before operation */
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struct timespec fh_pre_mtime; /* mtime before oper */
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struct timespec fh_pre_ctime; /* ctime before oper */
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/* Post-op attributes saved in fh_unlock */
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struct kstat fh_post_attr; /* full attrs after operation */
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#endif /* CONFIG_NFSD_V3 */
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} svc_fh;
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enum nfsd_fsid {
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FSID_DEV = 0,
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FSID_NUM,
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FSID_MAJOR_MINOR,
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FSID_ENCODE_DEV,
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FSID_UUID4_INUM,
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FSID_UUID8,
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FSID_UUID16,
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FSID_UUID16_INUM,
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};
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enum fsid_source {
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FSIDSOURCE_DEV,
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FSIDSOURCE_FSID,
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FSIDSOURCE_UUID,
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};
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extern enum fsid_source fsid_source(struct svc_fh *fhp);
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/* This might look a little large to "inline" but in all calls except
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* one, 'vers' is constant so moste of the function disappears.
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*/
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static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
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u32 fsid, unsigned char *uuid)
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{
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u32 *up;
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switch(vers) {
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case FSID_DEV:
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fsidv[0] = htonl((MAJOR(dev)<<16) |
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MINOR(dev));
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fsidv[1] = ino_t_to_u32(ino);
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break;
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case FSID_NUM:
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fsidv[0] = fsid;
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break;
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case FSID_MAJOR_MINOR:
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fsidv[0] = htonl(MAJOR(dev));
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fsidv[1] = htonl(MINOR(dev));
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fsidv[2] = ino_t_to_u32(ino);
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break;
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case FSID_ENCODE_DEV:
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fsidv[0] = new_encode_dev(dev);
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fsidv[1] = ino_t_to_u32(ino);
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break;
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case FSID_UUID4_INUM:
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/* 4 byte fsid and inode number */
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up = (u32*)uuid;
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fsidv[0] = ino_t_to_u32(ino);
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fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
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break;
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case FSID_UUID8:
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/* 8 byte fsid */
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up = (u32*)uuid;
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fsidv[0] = up[0] ^ up[2];
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fsidv[1] = up[1] ^ up[3];
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break;
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case FSID_UUID16:
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/* 16 byte fsid - NFSv3+ only */
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memcpy(fsidv, uuid, 16);
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break;
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case FSID_UUID16_INUM:
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/* 8 byte inode and 16 byte fsid */
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*(u64*)fsidv = (u64)ino;
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memcpy(fsidv+2, uuid, 16);
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break;
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default: BUG();
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}
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}
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static inline int key_len(int type)
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{
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switch(type) {
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case FSID_DEV: return 8;
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case FSID_NUM: return 4;
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case FSID_MAJOR_MINOR: return 12;
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case FSID_ENCODE_DEV: return 8;
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case FSID_UUID4_INUM: return 8;
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case FSID_UUID8: return 8;
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case FSID_UUID16: return 16;
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case FSID_UUID16_INUM: return 24;
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default: return 0;
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}
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}
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/*
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* Shorthand for dprintk()'s
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*/
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extern char * SVCFH_fmt(struct svc_fh *fhp);
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/*
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* Function prototypes
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*/
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__be32 fh_verify(struct svc_rqst *, struct svc_fh *, int, int);
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__be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
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__be32 fh_update(struct svc_fh *);
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void fh_put(struct svc_fh *);
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static __inline__ struct svc_fh *
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fh_copy(struct svc_fh *dst, struct svc_fh *src)
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{
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WARN_ON(src->fh_dentry || src->fh_locked);
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*dst = *src;
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return dst;
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}
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static inline void
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fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
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{
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dst->fh_size = src->fh_size;
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memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
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}
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static __inline__ struct svc_fh *
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fh_init(struct svc_fh *fhp, int maxsize)
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{
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memset(fhp, 0, sizeof(*fhp));
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fhp->fh_maxsize = maxsize;
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return fhp;
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}
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#ifdef CONFIG_NFSD_V3
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/*
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* Fill in the pre_op attr for the wcc data
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*/
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static inline void
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fill_pre_wcc(struct svc_fh *fhp)
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{
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struct inode *inode;
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inode = fhp->fh_dentry->d_inode;
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if (!fhp->fh_pre_saved) {
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fhp->fh_pre_mtime = inode->i_mtime;
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fhp->fh_pre_ctime = inode->i_ctime;
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fhp->fh_pre_size = inode->i_size;
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fhp->fh_pre_saved = 1;
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}
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}
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extern void fill_post_wcc(struct svc_fh *);
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#else
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#define fill_pre_wcc(ignored)
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#define fill_post_wcc(notused)
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#endif /* CONFIG_NFSD_V3 */
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/*
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* Lock a file handle/inode
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* NOTE: both fh_lock and fh_unlock are done "by hand" in
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* vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
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* so, any changes here should be reflected there.
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*/
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static inline void
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fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
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{
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struct dentry *dentry = fhp->fh_dentry;
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struct inode *inode;
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dfprintk(FILEOP, "nfsd: fh_lock(%s) locked = %d\n",
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SVCFH_fmt(fhp), fhp->fh_locked);
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BUG_ON(!dentry);
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if (fhp->fh_locked) {
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printk(KERN_WARNING "fh_lock: %s/%s already locked!\n",
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dentry->d_parent->d_name.name, dentry->d_name.name);
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return;
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}
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inode = dentry->d_inode;
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mutex_lock_nested(&inode->i_mutex, subclass);
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fill_pre_wcc(fhp);
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fhp->fh_locked = 1;
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}
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static inline void
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fh_lock(struct svc_fh *fhp)
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{
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fh_lock_nested(fhp, I_MUTEX_NORMAL);
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}
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/*
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* Unlock a file handle/inode
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*/
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static inline void
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fh_unlock(struct svc_fh *fhp)
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{
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BUG_ON(!fhp->fh_dentry);
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if (fhp->fh_locked) {
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fill_post_wcc(fhp);
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mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
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fhp->fh_locked = 0;
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}
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}
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#endif /* __KERNEL__ */
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#endif /* _LINUX_NFSD_FH_H */
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