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/*

 * Inode operations for Coda filesystem

 * Original version: (C) 1996 P. Braam and M. Callahan

 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University

 *

 * Carnegie Mellon encourages users to contribute improvements to

 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).

 */

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/time.h>

#include <linux/fs.h>

#include <linux/stat.h>

#include <linux/errno.h>

#include <asm/uaccess.h>

#include <linux/string.h>

#include <linux/coda.h>

#include <linux/coda_linux.h>

#include <linux/coda_psdev.h>

#include <linux/coda_fs_i.h>

/* initialize the debugging variables */

int coda_fake_statfs;

/* print a fid */

char * coda_f2s(struct CodaFid *f)

{

        static char s[60];

#ifdef CONFIG_CODA_FS_OLD_API

        sprintf(s, "(%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2]);

#else

        sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);

#endif

        return s;

}

/* recognize special .CONTROL name */

int coda_iscontrol(const char *name, size_t length)

{

        return ((CODA_CONTROLLEN == length) &&

                (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));

}

/* recognize /coda inode */

int coda_isroot(struct inode *i)

{

    return ( i->i_sb->s_root->d_inode == i );

}

unsigned short coda_flags_to_cflags(unsigned short flags)

{

        unsigned short coda_flags = 0;

        if ((flags & O_ACCMODE) == O_RDONLY)

                coda_flags |= C_O_READ;

        if ((flags & O_ACCMODE) == O_RDWR)

                coda_flags |= C_O_READ | C_O_WRITE;

        if ((flags & O_ACCMODE) == O_WRONLY)

                coda_flags |= C_O_WRITE;

        if (flags & O_TRUNC)

                coda_flags |= C_O_TRUNC;

        if (flags & O_CREAT)

                coda_flags |= C_O_CREAT;

        if (flags & O_EXCL)

                coda_flags |= C_O_EXCL;

        return coda_flags;

}

/* utility functions below */

void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)

{

        int inode_type;

        /* inode's i_flags, i_ino are set by iget

           XXX: is this all we need ??

           */

        switch (attr->va_type) {

        case C_VNON:

                inode_type  = 0;

                break;

        case C_VREG:

                inode_type = S_IFREG;

                break;

        case C_VDIR:

                inode_type = S_IFDIR;

                break;

        case C_VLNK:

                inode_type = S_IFLNK;

                break;

        default:

                inode_type = 0;

        }

        inode->i_mode |= inode_type;

        if (attr->va_mode != (u_short) -1)

                inode->i_mode = attr->va_mode | inode_type;

        if (attr->va_uid != -1)

                inode->i_uid = (uid_t) attr->va_uid;

        if (attr->va_gid != -1)

                inode->i_gid = (gid_t) attr->va_gid;

        if (attr->va_nlink != -1)

                inode->i_nlink = attr->va_nlink;

        if (attr->va_size != -1)

                inode->i_size = attr->va_size;

        if (attr->va_size != -1)

                inode->i_blocks = (attr->va_size + 511) >> 9;

        if (attr->va_atime.tv_sec != -1)

                inode->i_atime = attr->va_atime;

        if (attr->va_mtime.tv_sec != -1)

                inode->i_mtime = attr->va_mtime;

        if (attr->va_ctime.tv_sec != -1)

                inode->i_ctime = attr->va_ctime;

}

/*

 * BSD sets attributes that need not be modified to -1.

 * Linux uses the valid field to indicate what should be

 * looked at.  The BSD type field needs to be deduced from linux

 * mode.

 * So we have to do some translations here.

 */

void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)

{

        unsigned int valid;

        /* clean out */

        vattr->va_mode = (umode_t) -1;

        vattr->va_uid = (vuid_t) -1;

        vattr->va_gid = (vgid_t) -1;

        vattr->va_size = (off_t) -1;

        vattr->va_atime.tv_sec = (time_t) -1;

        vattr->va_atime.tv_nsec =  (time_t) -1;

        vattr->va_mtime.tv_sec = (time_t) -1;

        vattr->va_mtime.tv_nsec = (time_t) -1;

        vattr->va_ctime.tv_sec = (time_t) -1;

        vattr->va_ctime.tv_nsec = (time_t) -1;

        vattr->va_type = C_VNON;

        vattr->va_fileid = -1;

        vattr->va_gen = -1;

        vattr->va_bytes = -1;

        vattr->va_nlink = -1;

        vattr->va_blocksize = -1;

        vattr->va_rdev = -1;

        vattr->va_flags = 0;

        /* determine the type */

#if 0

        mode = iattr->ia_mode;

                if ( S_ISDIR(mode) ) {

                vattr->va_type = C_VDIR;

        } else if ( S_ISREG(mode) ) {

                vattr->va_type = C_VREG;

        } else if ( S_ISLNK(mode) ) {

                vattr->va_type = C_VLNK;

        } else {

                /* don't do others */

                vattr->va_type = C_VNON;

        }

#endif 

        /* set those vattrs that need change */

        valid = iattr->ia_valid;

        if ( valid & ATTR_MODE ) {

                vattr->va_mode = iattr->ia_mode;

        }

        if ( valid & ATTR_UID ) {

                vattr->va_uid = (vuid_t) iattr->ia_uid;

        }

        if ( valid & ATTR_GID ) {

                vattr->va_gid = (vgid_t) iattr->ia_gid;

        }

        if ( valid & ATTR_SIZE ) {

                vattr->va_size = iattr->ia_size;

        }

        if ( valid & ATTR_ATIME ) {

                vattr->va_atime = iattr->ia_atime;

        }

        if ( valid & ATTR_MTIME ) {

                vattr->va_mtime = iattr->ia_mtime;

        }

        if ( valid & ATTR_CTIME ) {

                vattr->va_ctime = iattr->ia_ctime;

        }

}