206 lines
4.1 KiB
C
206 lines
4.1 KiB
C
/* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */
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#ifndef _LINUX_NFSD_FH_INT_H
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#define _LINUX_NFSD_FH_INT_H
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#include <linux/nfsd/nfsfh.h>
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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 *, umode_t, 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_change = inode->i_version;
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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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BUG_ON(!dentry);
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if (fhp->fh_locked) {
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printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
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dentry);
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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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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 /* _LINUX_NFSD_FH_INT_H */
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