[MTD] generalise the handling of MTD-specific superblocks
Generalise the handling of MTD-specific superblocks so that JFFS2 and ROMFS
can both share it.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index e51164a..e3c69e6 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -19,7 +19,7 @@
#include <linux/mount.h>
#include <linux/jffs2.h>
#include <linux/pagemap.h>
-#include <linux/mtd/mtd.h>
+#include <linux/mtd/super.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include "compr.h"
@@ -78,69 +78,27 @@
.sync_fs = jffs2_sync_fs,
};
-static int jffs2_sb_compare(struct super_block *sb, void *data)
+/*
+ * fill in the superblock
+ */
+static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
{
- struct jffs2_sb_info *p = 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 == p->mtd) {
- D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", p->mtd->index, p->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, p->mtd->index, p->mtd->name));
- return 0;
- }
-}
-
-static int jffs2_sb_set(struct super_block *sb, void *data)
-{
- struct jffs2_sb_info *p = data;
-
- /* 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_fs_info = p;
- p->os_priv = sb;
- sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, p->mtd->index);
-
- return 0;
-}
-
-static int jffs2_get_sb_mtd(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data, struct mtd_info *mtd,
- struct vfsmount *mnt)
-{
- struct super_block *sb;
struct jffs2_sb_info *c;
- int ret;
+
+ D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():"
+ " New superblock for device %d (\"%s\")\n",
+ sb->s_mtd->index, sb->s_mtd->name));
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
- c->mtd = mtd;
- sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
+ c->mtd = sb->s_mtd;
+ c->os_priv = sb;
+ sb->s_fs_info = c;
- if (IS_ERR(sb))
- goto out_error;
-
- 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));
- ret = simple_set_mnt(mnt, sb);
- goto out_put;
- }
-
- D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
- mtd->index, mtd->name));
-
- /* Initialize JFFS2 superblock locks, the further initialization will be
- * done later */
+ /* Initialize JFFS2 superblock locks, the further initialization will
+ * be done later */
init_MUTEX(&c->alloc_sem);
init_MUTEX(&c->erase_free_sem);
init_waitqueue_head(&c->erase_wait);
@@ -149,133 +107,20 @@
spin_lock_init(&c->inocache_lock);
sb->s_op = &jffs2_super_operations;
- sb->s_flags = flags | MS_NOATIME;
+ sb->s_flags = sb->s_flags | MS_NOATIME;
sb->s_xattr = jffs2_xattr_handlers;
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
sb->s_flags |= MS_POSIXACL;
#endif
- ret = jffs2_do_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
-
- if (ret) {
- /* Failure case... */
- up_write(&sb->s_umount);
- deactivate_super(sb);
- return ret;
- }
-
- sb->s_flags |= MS_ACTIVE;
- return simple_set_mnt(mnt, sb);
-
-out_error:
- ret = PTR_ERR(sb);
- out_put:
- kfree(c);
- put_mtd_device(mtd);
-
- return ret;
-}
-
-static int jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data, int mtdnr,
- struct vfsmount *mnt)
-{
- struct mtd_info *mtd;
-
- mtd = get_mtd_device(NULL, mtdnr);
- if (IS_ERR(mtd)) {
- D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
- return PTR_ERR(mtd);
- }
-
- return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
+ return jffs2_do_fill_super(sb, data, silent);
}
static int jffs2_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *data, struct vfsmount *mnt)
{
- int err;
- struct nameidata nd;
- int mtdnr;
-
- if (!dev_name)
- return -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 (!IS_ERR(mtd)) {
- if (!strcmp(mtd->name, dev_name+4))
- return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
- 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, mnt);
- }
- }
- }
-
- /* 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;
-
- err = -EINVAL;
-
- if (!S_ISBLK(nd.dentry->d_inode->i_mode))
- goto out;
-
- if (nd.mnt->mnt_flags & MNT_NODEV) {
- err = -EACCES;
- goto out;
- }
-
- if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) {
- if (!(flags & MS_SILENT))
- printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
- dev_name);
- goto out;
- }
-
- mtdnr = iminor(nd.dentry->d_inode);
- path_release(&nd);
-
- return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt);
-
-out:
- path_release(&nd);
- return err;
+ return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super,
+ mnt);
}
static void jffs2_put_super (struct super_block *sb)
@@ -310,8 +155,7 @@
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
if (!(sb->s_flags & MS_RDONLY))
jffs2_stop_garbage_collect_thread(c);
- generic_shutdown_super(sb);
- put_mtd_device(c->mtd);
+ kill_mtd_super(sb);
kfree(c);
}