nfsd: move most of nfsfh.h to fs/nfsd

Most of this can be trivially moved to a private header as well.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 208 insertions, 0 deletions

diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
new file mode 100644
index 000000000000..cdfb8c6a4206
--- /dev/null
+++ b/fs/nfsd/nfsfh.h
@@ -0,0 +1,208 @@
+/* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */
+
+#ifndef _LINUX_NFSD_FH_INT_H
+#define _LINUX_NFSD_FH_INT_H
+
+#include <linux/nfsd/nfsfh.h>
+
+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 void
+fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
+{
+        dst->fh_size = src->fh_size;
+        memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
+}
+
+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_change = inode->i_version;
+                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;
+
+        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 /* _LINUX_NFSD_FH_INT_H */