Viewing file:  inode.c (6.7 KB) -rw-r--r--
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/*
* Super block/filesystem wide operations
*
* Copyright (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 <linux/smp_lock.h>
#include <linux/file.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/fs.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 void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct super_block *sb, struct statfs *buf);
/* exported operations */
struct super_operations coda_super_operations =
{
read_inode: coda_read_inode,
clear_inode: coda_clear_inode,
put_super: coda_put_super,
statfs: coda_statfs,
};
static int get_device_index(struct coda_mount_data *data)
{
struct file *file;
struct inode *inode;
int idx;
if(data == NULL) {
printk("coda_read_super: Bad mount data\n");
return -1;
}
if(data->version != CODA_MOUNT_VERSION) {
printk("coda_read_super: Bad mount version\n");
return -1;
}
file = fget(data->fd);
inode = NULL;
if(file)
inode = file->f_dentry->d_inode;
if(!inode || !S_ISCHR(inode->i_mode) ||
MAJOR(inode->i_rdev) != CODA_PSDEV_MAJOR) {
if(file)
fput(file);
printk("coda_read_super: Bad file\n");
return -1;
}
idx = MINOR(inode->i_rdev);
fput(file);
if(idx < 0 || idx >= MAX_CODADEVS) {
printk("coda_read_super: Bad minor number\n");
return -1;
}
return idx;
}
static struct super_block * coda_read_super(struct super_block *sb,
void *data, int silent)
{
struct inode *root = 0;
struct coda_sb_info *sbi = NULL;
struct venus_comm *vc = NULL;
ViceFid fid;
int error;
int idx;
idx = get_device_index((struct coda_mount_data *) data);
/* Ignore errors in data, for backward compatibility */
if(idx == -1)
idx = 0;
printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
vc = &coda_comms[idx];
if (!vc->vc_inuse) {
printk("coda_read_super: No pseudo device\n");
return NULL;
}
if ( vc->vc_sb ) {
printk("coda_read_super: Device already mounted\n");
return NULL;
}
sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
if(!sbi) {
return NULL;
}
vc->vc_sb = sb;
sbi->sbi_sb = sb;
sbi->sbi_vcomm = vc;
INIT_LIST_HEAD(&sbi->sbi_cihead);
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_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);
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);
goto error;
}
printk("coda_read_super: rootinode is %ld dev %d\n",
root->i_ino, root->i_dev);
sb->s_root = d_alloc_root(root);
return sb;
error:
if (sbi) {
kfree(sbi);
if(vc)
vc->vc_sb = NULL;
}
if (root)
iput(root);
return NULL;
}
static void coda_put_super(struct super_block *sb)
{
struct coda_sb_info *sbi;
sbi = coda_sbp(sb);
sbi->sbi_vcomm->vc_sb = NULL;
list_del_init(&sbi->sbi_cihead);
printk("Coda: Bye bye.\n");
kfree(sbi);
}
/* all filling in of inodes postponed until lookup */
static void coda_read_inode(struct inode *inode)
{
struct coda_sb_info *sbi = coda_sbp(inode->i_sb);
struct coda_inode_info *cii;
if (!sbi) BUG();
#if 0
/* check if the inode is already initialized */
if (inode->u.generic_ip) {
printk("coda_read_inode: initialized inode");
return;
}
inode->u.generic_ip = cii_alloc();
if (!inode->u.generic_ip) {
CDEBUG(D_CNODE, "coda_read_inode: failed to allocate inode info\n");
make_bad_inode(inode);
return;
}
memset(inode->u.generic_ip, 0, sizeof(struct coda_inode_info));
#endif
cii = ITOC(inode);
if (!coda_isnullfid(&cii->c_fid)) {
printk("coda_read_inode: initialized inode");
return;
}
list_add(&cii->c_cilist, &sbi->sbi_cihead);
}
static void coda_clear_inode(struct inode *inode)
{
struct coda_inode_info *cii = ITOC(inode);
CDEBUG(D_SUPER, " inode->ino: %ld, count: %d\n",
inode->i_ino, atomic_read(&inode->i_count));
CDEBUG(D_DOWNCALL, "clearing inode: %ld, %x\n", inode->i_ino, cii->c_flags);
if (cii->c_container) BUG();
list_del_init(&cii->c_cilist);
inode->i_mapping = &inode->i_data;
coda_cache_clear_inode(inode);
#if 0
cii_free(inode->u.generic_ip);
inode->u.generic_ip = NULL;
#endif
}
int coda_notify_change(struct dentry *de, struct iattr *iattr)
{
struct inode *inode = de->d_inode;
struct coda_vattr vattr;
int error;
inode->i_ctime = CURRENT_TIME;
memset(&vattr, 0, sizeof(vattr));
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);
/* Venus is responsible for truncating the container-file!!! */
error = venus_setattr(inode->i_sb, coda_i2f(inode), &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);
return error;
}
struct inode_operations coda_file_inode_operations = {
permission: coda_permission,
revalidate: coda_revalidate_inode,
setattr: coda_notify_change,
};
static int coda_statfs(struct super_block *sb, struct statfs *buf)
{
int error;
error = venus_statfs(sb, buf);
if (error) {
/* fake something like AFS does */
buf->f_blocks = 9000000;
buf->f_bfree = 9000000;
buf->f_bavail = 9000000;
buf->f_files = 9000000;
buf->f_ffree = 9000000;
}
/* and fill in the rest */
buf->f_type = CODA_SUPER_MAGIC;
buf->f_bsize = 1024;
buf->f_namelen = CODA_MAXNAMLEN;
return 0;
}
/* init_coda: used by filesystems.c to register coda */
DECLARE_FSTYPE( coda_fs_type, "coda", coda_read_super, 0);
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