Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / freevxfs / vxfs_dir.h

diff --git a/kernel/fs/freevxfs/vxfs_dir.h b/kernel/fs/freevxfs/vxfs_dir.h
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+++ b/kernel/fs/freevxfs/vxfs_dir.h
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+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+#ifndef _VXFS_DIR_H_
+#define _VXFS_DIR_H_
+
+/*
+ * Veritas filesystem driver - directory structure.
+ *
+ * This file contains the definition of the vxfs directory format.
+ */
+
+
+/*
+ * VxFS directory block header.
+ *
+ * This entry is the head of every filesystem block in a directory.
+ * It is used for free space management and additionally includes
+ * a hash for speeding up directory search (lookup).
+ *
+ * The hash may be empty and in fact we do not use it all in the
+ * Linux driver for now.
+ */
+struct vxfs_dirblk {
+       u_int16_t       d_free;         /* free space in dirblock */
+       u_int16_t       d_nhash;        /* no of hash chains */
+       u_int16_t       d_hash[1];      /* hash chain */
+};
+
+/*
+ * VXFS_NAMELEN is the maximum length of the d_name field
+ *     of an VxFS directory entry.
+ */
+#define VXFS_NAMELEN   256
+
+/*
+ * VxFS directory entry.
+ */
+struct vxfs_direct {
+       vx_ino_t        d_ino;                  /* inode number */
+       u_int16_t       d_reclen;               /* record length */
+       u_int16_t       d_namelen;              /* d_name length */
+       u_int16_t       d_hashnext;             /* next hash entry */
+       char            d_name[VXFS_NAMELEN];   /* name */
+};
+
+/*
+ * VXFS_DIRPAD defines the directory entry boundaries, is _must_ be
+ *     a multiple of four.
+ * VXFS_NAMEMIN is the length of a directory entry with a NULL d_name.
+ * VXFS_DIRROUND is an internal macros that rounds a length to a value
+ *     usable for directory sizes.
+ * VXFS_DIRLEN calculates the directory entry size for an entry with
+ *     a d_name with size len.
+ */
+#define VXFS_DIRPAD            4
+#define VXFS_NAMEMIN           offsetof(struct vxfs_direct, d_name)
+#define VXFS_DIRROUND(len)     ((VXFS_DIRPAD + (len) - 1) & ~(VXFS_DIRPAD -1))
+#define VXFS_DIRLEN(len)       (VXFS_DIRROUND(VXFS_NAMEMIN + (len)))
+
+/*
+ * VXFS_DIRBLKOV is the overhead of a specific dirblock.
+ */
+#define VXFS_DIRBLKOV(dbp)     ((sizeof(short) * dbp->d_nhash) + 4)
+
+#endif /* _VXFS_DIR_H_ */