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DEFINITIONS
This source file includes following definitions.
- coda_alloc_inode
- coda_destroy_inode
- init_once
- coda_init_inodecache
- coda_destroy_inodecache
- coda_remount
- get_device_index
- coda_fill_super
- coda_put_super
- coda_clear_inode
- coda_getattr
- coda_setattr
- coda_statfs
- coda_get_sb
/*
* 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
*/
#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/unistd.h>
#include <linux/smp_lock.h>
#include <linux/file.h>
#include <linux/vfs.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/fs.h>
#include <linux/vmalloc.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>
#include "coda_int.h"
/* VFS super_block ops */
static void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
static struct kmem_cache * coda_inode_cachep;
static struct inode *coda_alloc_inode(struct super_block *sb)
{
struct coda_inode_info *ei;
ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
memset(&ei->c_fid, 0, sizeof(struct CodaFid));
ei->c_flags = 0;
ei->c_uid = 0;
ei->c_cached_perm = 0;
return &ei->vfs_inode;
}
static void coda_destroy_inode(struct inode *inode)
{
kmem_cache_free(coda_inode_cachep, ITOC(inode));
}
static void init_once(void *foo)
{
struct coda_inode_info *ei = (struct coda_inode_info *) foo;
inode_init_once(&ei->vfs_inode);
}
int coda_init_inodecache(void)
{
coda_inode_cachep = kmem_cache_create("coda_inode_cache",
sizeof(struct coda_inode_info),
0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
init_once);
if (coda_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
void coda_destroy_inodecache(void)
{
kmem_cache_destroy(coda_inode_cachep);
}
static int coda_remount(struct super_block *sb, int *flags, char *data)
{
*flags |= MS_NOATIME;
return 0;
}
/* exported operations */
static const struct super_operations coda_super_operations =
{
.alloc_inode = coda_alloc_inode,
.destroy_inode = coda_destroy_inode,
.clear_inode = coda_clear_inode,
.put_super = coda_put_super,
.statfs = coda_statfs,
.remount_fs = coda_remount,
};
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_path.dentry->d_inode;
if(!inode || !S_ISCHR(inode->i_mode) ||
imajor(inode) != CODA_PSDEV_MAJOR) {
if(file)
fput(file);
printk("coda_read_super: Bad file\n");
return -1;
}
idx = iminor(inode);
fput(file);
if(idx < 0 || idx >= MAX_CODADEVS) {
printk("coda_read_super: Bad minor number\n");
return -1;
}
return idx;
}
static int coda_fill_super(struct super_block *sb, void *data, int silent)
{
struct inode *root = NULL;
struct venus_comm *vc = NULL;
struct CodaFid 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 -EINVAL;
}
if ( vc->vc_sb ) {
printk("coda_read_super: Device already mounted\n");
return -EBUSY;
}
vc->vc_sb = sb;
sb->s_fs_info = vc;
sb->s_flags |= MS_NOATIME;
sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
sb->s_blocksize_bits = 12;
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 %s\n",
root->i_ino, root->i_sb->s_id);
sb->s_root = d_alloc_root(root);
if (!sb->s_root)
goto error;
return 0;
error:
if (root)
iput(root);
if (vc)
vc->vc_sb = NULL;
return -EINVAL;
}
static void coda_put_super(struct super_block *sb)
{
coda_vcp(sb)->vc_sb = NULL;
sb->s_fs_info = NULL;
printk("Coda: Bye bye.\n");
}
static void coda_clear_inode(struct inode *inode)
{
coda_cache_clear_inode(inode);
}
int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
int err = coda_revalidate_inode(dentry);
if (!err)
generic_fillattr(dentry->d_inode, stat);
return err;
}
int coda_setattr(struct dentry *de, struct iattr *iattr)
{
struct inode *inode = de->d_inode;
struct coda_vattr vattr;
int error;
lock_kernel();
memset(&vattr, 0, sizeof(vattr));
inode->i_ctime = CURRENT_TIME_SEC;
coda_iattr_to_vattr(iattr, &vattr);
vattr.va_type = C_VNON; /* cannot set type */
/* 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);
}
unlock_kernel();
return error;
}
const struct inode_operations coda_file_inode_operations = {
.permission = coda_permission,
.getattr = coda_getattr,
.setattr = coda_setattr,
};
static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int error;
lock_kernel();
error = venus_statfs(dentry, buf);
unlock_kernel();
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 = 4096;
buf->f_namelen = CODA_MAXNAMLEN;
return 0;
}
/* init_coda: used by filesystems.c to register coda */
static int coda_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
}
struct file_system_type coda_fs_type = {
.owner = THIS_MODULE,
.name = "coda",
.get_sb = coda_get_sb,
.kill_sb = kill_anon_super,
.fs_flags = FS_BINARY_MOUNTDATA,
};