322 lines
7.0 KiB
C
322 lines
7.0 KiB
C
/*
|
|
* 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>
|
|
|
|
/* VFS super_block ops */
|
|
static void coda_clear_inode(struct inode *);
|
|
static void coda_put_super(struct super_block *);
|
|
static int coda_statfs(struct super_block *sb, struct kstatfs *buf);
|
|
|
|
static kmem_cache_t * 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, SLAB_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, kmem_cache_t * cachep, unsigned long flags)
|
|
{
|
|
struct coda_inode_info *ei = (struct coda_inode_info *) foo;
|
|
|
|
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
|
|
SLAB_CTOR_CONSTRUCTOR)
|
|
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,
|
|
init_once, NULL);
|
|
if (coda_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void coda_destroy_inodecache(void)
|
|
{
|
|
if (kmem_cache_destroy(coda_inode_cachep))
|
|
printk(KERN_INFO "coda_inode_cache: not all structures were freed\n");
|
|
}
|
|
|
|
static int coda_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
*flags |= MS_NODIRATIME;
|
|
return 0;
|
|
}
|
|
|
|
/* exported operations */
|
|
static 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_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 coda_sb_info *sbi = 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;
|
|
}
|
|
|
|
sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
|
|
if(!sbi) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
vc->vc_sb = sb;
|
|
|
|
sbi->sbi_vcomm = vc;
|
|
|
|
sb->s_fs_info = sbi;
|
|
sb->s_flags |= MS_NODIRATIME; /* probably even noatime */
|
|
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 %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 (sbi) {
|
|
kfree(sbi);
|
|
if(vc)
|
|
vc->vc_sb = NULL;
|
|
}
|
|
if (root)
|
|
iput(root);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void coda_put_super(struct super_block *sb)
|
|
{
|
|
struct coda_sb_info *sbi;
|
|
|
|
sbi = coda_sbp(sb);
|
|
sbi->sbi_vcomm->vc_sb = NULL;
|
|
|
|
printk("Coda: Bye bye.\n");
|
|
kfree(sbi);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
struct inode_operations coda_file_inode_operations = {
|
|
.permission = coda_permission,
|
|
.getattr = coda_getattr,
|
|
.setattr = coda_setattr,
|
|
};
|
|
|
|
static int coda_statfs(struct super_block *sb, struct kstatfs *buf)
|
|
{
|
|
int error;
|
|
|
|
lock_kernel();
|
|
|
|
error = venus_statfs(sb, 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 = 1024;
|
|
buf->f_namelen = CODA_MAXNAMLEN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* init_coda: used by filesystems.c to register coda */
|
|
|
|
static struct super_block *coda_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return get_sb_nodev(fs_type, flags, data, coda_fill_super);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|