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/*
* Super block/filesystem wide operations
*
* Copryright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
* Michael Callahan <callahan@maths.ox.ac.uk>
*
* Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
* Copyright (C) Carnegie Mellon University
*/
#define __NO_VERSION__
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <linux/unistd.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <asm/uaccess.h>
#include <linux/vmalloc.h>
#include <asm/segment.h>
#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_psdev.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_cache.h>
/* VFS super_block ops */
static struct super_block *coda_read_super(struct super_block *, void *, int);
static void coda_read_inode(struct inode *);
static int coda_notify_change(struct dentry *dentry, struct iattr *attr);
static void coda_put_inode(struct inode *);
static void coda_delete_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct super_block *sb, struct statfs *buf,
int bufsiz);
/* exported operations */
struct super_operations coda_super_operations =
{
coda_read_inode, /* read_inode */
NULL, /* write_inode */
coda_put_inode, /* put_inode */
coda_delete_inode, /* delete_inode */
coda_notify_change, /* notify_change */
coda_put_super, /* put_super */
NULL, /* write_super */
coda_statfs, /* statfs */
NULL /* remount_fs */
};
static struct super_block * coda_read_super(struct super_block *sb,
void *data, int silent)
{
struct inode *psdev = 0, *root = 0;
struct coda_sb_info *sbi = NULL;
struct venus_comm *vc = NULL;
ViceFid fid;
kdev_t dev = sb->s_dev;
int error;
ENTRY;
MOD_INC_USE_COUNT;
vc = &coda_upc_comm;
sbi = &coda_super_info;
if ( sbi->sbi_sb ) {
printk("Already mounted\n");
return NULL;
}
sbi->sbi_sb = sb;
sbi->sbi_psdev = psdev;
sbi->sbi_vcomm = vc;
INIT_LIST_HEAD(&(sbi->sbi_cchead));
INIT_LIST_HEAD(&(sbi->sbi_volroothead));
lock_super(sb);
sb->u.generic_sbp = sbi;
sb->s_blocksize = 1024; /* XXXXX what do we put here?? */
sb->s_blocksize_bits = 10;
sb->s_magic = CODA_SUPER_MAGIC;
sb->s_dev = dev;
sb->s_op = &coda_super_operations;
/* get root fid from Venus: this needs the root inode */
error = venus_rootfid(sb, &fid);
if ( error ) {
printk("coda_read_super: coda_get_rootfid failed with %d\n",
error);
sb->s_dev = 0;
unlock_super(sb);
goto error;
}
printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
/* make root inode */
error = coda_cnode_make(&root, &fid, sb);
if ( error || !root ) {
printk("Failure of coda_cnode_make for root: error %d\n", error);
sb->s_dev = 0;
unlock_super(sb);
goto error;
}
printk("coda_read_super: rootinode is %ld dev %d\n",
root->i_ino, root->i_dev);
sbi->sbi_root = root;
sb->s_root = d_alloc_root(root);
unlock_super(sb);
EXIT;
return sb;
error:
EXIT;
MOD_DEC_USE_COUNT;
if (sbi) {
sbi->sbi_vcomm = NULL;
sbi->sbi_root = NULL;
sbi->sbi_sb = NULL;
}
if (root) {
iput(root);
}
sb->s_dev = 0;
return NULL;
}
static void coda_put_super(struct super_block *sb)
{
struct coda_sb_info *sb_info;
ENTRY;
sb->s_dev = 0;
coda_cache_clear_all(sb);
sb_info = coda_sbp(sb);
/* sb_info->sbi_vcomm->vc_inuse = 0; You can not do this: psdev_release would see usagecount == 0 and would refuse to decrease MOD_USE_COUNT --pavel */
coda_super_info.sbi_sb = NULL;
printk("Coda: Bye bye.\n");
memset(sb_info, 0, sizeof(* sb_info));
MOD_DEC_USE_COUNT;
EXIT;
}
/* all filling in of inodes postponed until lookup */
static void coda_read_inode(struct inode *inode)
{
struct coda_inode_info *cii;
ENTRY;
cii = ITOC(inode);
cii->c_magic = 0;
return;
}
static void coda_put_inode(struct inode *in)
{
ENTRY;
CDEBUG(D_INODE,"ino: %ld, count %d\n", in->i_ino, in->i_count);
if ( in->i_count == 1 )
in->i_nlink = 0;
}
static void coda_delete_inode(struct inode *inode)
{
struct coda_inode_info *cii;
struct inode *open_inode;
ENTRY;
CDEBUG(D_SUPER, " inode->ino: %ld, count: %d\n",
inode->i_ino, inode->i_count);
cii = ITOC(inode);
if ( inode->i_ino == CTL_INO || cii->c_magic != CODA_CNODE_MAGIC ) {
clear_inode(inode);
return;
}
if ( ! list_empty(&cii->c_volrootlist) )
list_del(&cii->c_volrootlist);
open_inode = cii->c_ovp;
if ( open_inode ) {
CDEBUG(D_SUPER, "DELINO cached file: ino %ld count %d.\n",
open_inode->i_ino, open_inode->i_count);
cii->c_ovp = NULL;
iput(open_inode);
}
coda_cache_clear_inode(inode);
CDEBUG(D_DOWNCALL, "clearing inode: %ld, %x\n", inode->i_ino, cii->c_flags);
inode->u.generic_ip = NULL;
clear_inode(inode);
EXIT;
}
static int coda_notify_change(struct dentry *de, struct iattr *iattr)
{
struct inode *inode = de->d_inode;
struct coda_inode_info *cii;
struct coda_vattr vattr;
int error;
ENTRY;
memset(&vattr, 0, sizeof(vattr));
cii = ITOC(inode);
CHECK_CNODE(cii);
coda_iattr_to_vattr(iattr, &vattr);
vattr.va_type = C_VNON; /* cannot set type */
CDEBUG(D_SUPER, "vattr.va_mode %o\n", vattr.va_mode);
error = venus_setattr(inode->i_sb, &cii->c_fid, &vattr);
if ( !error ) {
coda_vattr_to_iattr(inode, &vattr);
coda_cache_clear_inode(inode);
}
CDEBUG(D_SUPER, "inode.i_mode %o, error %d\n",
inode->i_mode, error);
EXIT;
return error;
}
/* we need _something_ for this routine. Let's mimic AFS */
static int coda_statfs(struct super_block *sb, struct statfs *buf,
int bufsiz)
{
struct statfs tmp;
tmp.f_type = CODA_SUPER_MAGIC;
tmp.f_bsize = 1024;
tmp.f_blocks = 9000000;
tmp.f_bfree = 9000000;
tmp.f_bavail = 9000000 ;
tmp.f_files = 9000000;
tmp.f_ffree = 9000000;
tmp.f_namelen = 0;
copy_to_user(buf, &tmp, bufsiz);
return 0;
}
/* init_coda: used by filesystems.c to register coda */
struct file_system_type coda_fs_type = {
"coda", 0, coda_read_super, NULL
};
int init_coda_fs(void)
{
return register_filesystem(&coda_fs_type);
}
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