Commit 5bb3575c authored by David Woodhouse's avatar David Woodhouse

Remove jffs2_sb from struct super_block union.

Remove FS_REQUIRES_DEV from JFFS2. We never really used the block device anyway.
parent 0b2e8f29
......@@ -31,7 +31,7 @@
* provisions above, a recipient may use your version of this file
* under either the RHEPL or the GPL.
*
* $Id: os-linux.h,v 1.15 2002/03/08 11:31:48 dwmw2 Exp $
* $Id: os-linux.h,v 1.16 2002/03/17 10:18:42 dwmw2 Exp $
*
*/
......@@ -42,8 +42,8 @@
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,2)
#define JFFS2_INODE_INFO(i) (list_entry(i, struct jffs2_inode_info, vfs_inode))
#define OFNI_EDONI_2SFFJ(f) (&(f)->vfs_inode)
#define JFFS2_SB_INFO(sb) (&sb->u.jffs2_sb)
#define OFNI_BS_2SFFJ(c) ((struct super_block *) ( ((char *)c) - ((char *)(&((struct super_block *)NULL)->u)) ) )
#define JFFS2_SB_INFO(sb) (sb->u.generic_sbp)
#define OFNI_BS_2SFFJ(c) ((struct super_block *)c->os_priv)
#elif defined(JFFS2_OUT_OF_KERNEL)
#define JFFS2_INODE_INFO(i) ((struct jffs2_inode_info *) &(i)->u)
#define OFNI_EDONI_2SFFJ(f) ((struct inode *) ( ((char *)f) - ((char *)(&((struct inode *)NULL)->u)) ) )
......
......@@ -31,7 +31,7 @@
* provisions above, a recipient may use your version of this file
* under either the RHEPL or the GPL.
*
* $Id: super.c,v 1.62 2002/03/12 16:23:41 dwmw2 Exp $
* $Id: super.c,v 1.64 2002/03/17 10:18:42 dwmw2 Exp $
*
*/
......@@ -47,6 +47,7 @@
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include <linux/interrupt.h>
#include <linux/ctype.h>
#include "nodelist.h"
void jffs2_put_super (struct super_block *);
......@@ -91,46 +92,194 @@ static struct super_operations jffs2_super_operations =
clear_inode: jffs2_clear_inode
};
static int jffs2_sb_compare(struct super_block *sb, void *data)
{
struct mtd_info *mtd = data;
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
/* The superblocks are considered to be equivalent if the underlying MTD
device is the same one */
if (c->mtd == mtd) {
D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", mtd->index, mtd->name));
return 1;
} else {
D1(printk(KERN_DEBUG "jffs2_sb_compare: No match, device %d (\"%s\"), device %d (\"%s\")\n",
c->mtd->index, c->mtd->name, mtd->index, mtd->name));
return 0;
}
}
static int jffs2_sb_set(struct super_block *sb, void *data)
{
struct mtd_info *mtd = data;
static int jffs2_blk_fill_super(struct super_block *sb, void *data, int silent)
/* For persistence of NFS exports etc. we use the same s_dev
each time we mount the device, don't just use an anonymous
device */
sb->s_dev = mk_kdev(MTD_BLOCK_MAJOR, mtd->index);
return 0;
}
static struct super_block *jffs2_get_sb_mtd(struct file_system_type *fs_type,
int flags, char *dev_name,
void *data, struct mtd_info *mtd)
{
struct super_block *sb;
struct jffs2_sb_info *c;
int ret;
D1(printk(KERN_DEBUG "jffs2: blk_read_super for device %s\n", sb->s_id));
sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, mtd);
if (IS_ERR(sb))
goto out_put;
if (major(sb->s_dev) != MTD_BLOCK_MAJOR) {
if (!silent)
printk(KERN_NOTICE "jffs2: attempt to mount non-MTD device %s\n",
sb->s_id);
return -EINVAL;
if (sb->s_root) {
/* New mountpoint for JFFS2 which is already mounted */
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
mtd->index, mtd->name));
goto out_put;
}
c = JFFS2_SB_INFO(sb);
memset(c, 0, sizeof(*c));
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
mtd->index, mtd->name));
c = kmalloc(sizeof(*c), GFP_KERNEL);
if (!c) {
sb = ERR_PTR(-ENOMEM);
goto out_put;
}
sb->u.generic_sbp = c;
sb->s_op = &jffs2_super_operations;
c->mtd = get_mtd_device(NULL, minor(sb->s_dev));
if (!c->mtd) {
D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", minor(sb->s_dev)));
return -EINVAL;
memset(c, 0, sizeof(*c));
c->os_priv = sb;
c->mtd = mtd;
ret = jffs2_do_fill_super(sb, data, (flags&MS_VERBOSE)?1:0);
if (ret) {
/* Failure case... */
up_write(&sb->s_umount);
deactivate_super(sb);
sb = ERR_PTR(ret);
goto out_put;
}
ret = jffs2_do_fill_super(sb, data, silent);
if (ret)
put_mtd_device(c->mtd);
sb->s_flags |= MS_ACTIVE;
return sb;
return ret;
out_put:
put_mtd_device(mtd);
return sb;
}
static struct super_block *jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
int flags, char *dev_name,
void *data, int mtdnr)
{
struct mtd_info *mtd;
mtd = get_mtd_device(NULL, mtdnr);
if (!mtd) {
D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
return ERR_PTR(-EINVAL);
}
return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
}
static struct super_block *jffs2_get_sb(struct file_system_type *fs_type,
int flags, char *dev_name, void *data)
{
int err;
struct nameidata nd;
int mtdnr;
kdev_t dev;
if (!dev_name)
return ERR_PTR(-EINVAL);
D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));
/* The preferred way of mounting in future; especially when
CONFIG_BLK_DEV is implemented - we specify the underlying
MTD device by number or by name, so that we don't require
block device support to be present in the kernel. */
/* FIXME: How to do the root fs this way? */
if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
/* Probably mounting without the blkdev crap */
if (dev_name[3] == ':') {
struct mtd_info *mtd;
/* Mount by MTD device name */
D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
mtd = get_mtd_device(NULL, mtdnr);
if (mtd) {
if (!strcmp(mtd->name, dev_name+4))
return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
put_mtd_device(mtd);
}
}
printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4);
} else if (isdigit(dev_name[3])) {
/* Mount by MTD device number name */
char *endptr;
mtdnr = simple_strtoul(dev_name+3, &endptr, 0);
if (!*endptr) {
/* It was a valid number */
D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
}
}
}
/* Try the old way - the hack where we allowed users to mount
/dev/mtdblock$(n) but didn't actually _use_ the blkdev */
err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n",
err, nd.dentry->d_inode));
if (err)
return ERR_PTR(err);
if (!S_ISBLK(nd.dentry->d_inode->i_mode)) {
path_release(&nd);
return ERR_PTR(-EINVAL);
}
if (nd.mnt->mnt_flags & MNT_NODEV) {
path_release(&nd);
return ERR_PTR(-EACCES);
}
dev = nd.dentry->d_inode->i_rdev;
path_release(&nd);
if (major(dev) != MTD_BLOCK_MAJOR) {
if (!(flags & MS_VERBOSE)) /* Yes I mean this. Strangely */
printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
dev_name);
return ERR_PTR(-EINVAL);
}
return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, minor(dev));
}
void jffs2_put_super (struct super_block *sb)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
if (!(sb->s_flags & MS_RDONLY))
jffs2_stop_garbage_collect_thread(c);
jffs2_flush_wbuf(c, 1);
......@@ -141,21 +290,16 @@ void jffs2_put_super (struct super_block *sb)
c->mtd->sync(c->mtd);
put_mtd_device(c->mtd);
D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}
kfree(c);
static struct super_block *jffs2_get_sb(struct file_system_type *fs_type,
int flags, char *dev_name, void *data)
{
return get_sb_bdev(fs_type, flags, dev_name, data, jffs2_blk_fill_super);
D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}
static struct file_system_type jffs2_fs_type = {
owner: THIS_MODULE,
name: "jffs2",
get_sb: jffs2_get_sb,
kill_sb: kill_block_super,
fs_flags: FS_REQUIRES_DEV,
kill_sb: generic_shutdown_super
};
......
......@@ -658,7 +658,6 @@ struct quota_mount_options
#include <linux/reiserfs_fs_sb.h>
#include <linux/bfs_fs_sb.h>
#include <linux/udf_fs_sb.h>
#include <linux/jffs2_fs_sb.h>
extern struct list_head super_blocks;
extern spinlock_t sb_lock;
......@@ -708,7 +707,6 @@ struct super_block {
struct reiserfs_sb_info reiserfs_sb;
struct bfs_sb_info bfs_sb;
struct udf_sb_info udf_sb;
struct jffs2_sb_info jffs2_sb;
void *generic_sbp;
} u;
/*
......
/* $Id: jffs2_fs_sb.h,v 1.25 2002/03/08 15:11:24 dwmw2 Exp $ */
/* $Id: jffs2_fs_sb.h,v 1.26 2002/03/17 10:18:42 dwmw2 Exp $ */
#ifndef _JFFS2_FS_SB
#define _JFFS2_FS_SB
......@@ -81,6 +81,9 @@ struct jffs2_sb_info {
uint32_t wbuf_ofs;
uint32_t wbuf_len;
uint32_t wbuf_pagesize;
/* OS-private pointer for getting back to master superblock info */
void *os_priv;
};
#endif /* _JFFS2_FB_SB */
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