}
EXPORT_SYMBOL_GPL(get_tree_mtd);
-/*
- * compare superblocks to see if they're equivalent
- * - they are if the underlying MTD device is the same
- */
-static int get_sb_mtd_compare(struct super_block *sb, void *_mtd)
-{
- struct mtd_info *mtd = _mtd;
-
- if (sb->s_mtd == mtd) {
- pr_debug("MTDSB: Match on device %d (\"%s\")\n",
- mtd->index, mtd->name);
- return 1;
- }
-
- pr_debug("MTDSB: No match, device %d (\"%s\"), device %d (\"%s\")\n",
- sb->s_mtd->index, sb->s_mtd->name, mtd->index, mtd->name);
- return 0;
-}
-
-/*
- * mark the superblock by the MTD device it is using
- * - set the device number to be the correct MTD block device for pesuperstence
- * of NFS exports
- */
-static int get_sb_mtd_set(struct super_block *sb, void *_mtd)
-{
- struct mtd_info *mtd = _mtd;
-
- sb->s_mtd = mtd;
- sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
- sb->s_bdi = bdi_get(mtd_bdi);
-
- return 0;
-}
-
-/*
- * get a superblock on an MTD-backed filesystem
- */
-static struct dentry *mount_mtd_aux(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data,
- struct mtd_info *mtd,
- int (*fill_super)(struct super_block *, void *, int))
-{
- struct super_block *sb;
- int ret;
-
- sb = sget(fs_type, get_sb_mtd_compare, get_sb_mtd_set, flags, mtd);
- if (IS_ERR(sb))
- goto out_error;
-
- if (sb->s_root)
- goto already_mounted;
-
- /* fresh new superblock */
- pr_debug("MTDSB: New superblock for device %d (\"%s\")\n",
- mtd->index, mtd->name);
-
- ret = fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
- if (ret < 0) {
- deactivate_locked_super(sb);
- return ERR_PTR(ret);
- }
-
- /* go */
- sb->s_flags |= SB_ACTIVE;
- return dget(sb->s_root);
-
- /* new mountpoint for an already mounted superblock */
-already_mounted:
- pr_debug("MTDSB: Device %d (\"%s\") is already mounted\n",
- mtd->index, mtd->name);
- put_mtd_device(mtd);
- return dget(sb->s_root);
-
-out_error:
- put_mtd_device(mtd);
- return ERR_CAST(sb);
-}
-
-/*
- * get a superblock on an MTD-backed filesystem by MTD device number
- */
-static struct dentry *mount_mtd_nr(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data, int mtdnr,
- int (*fill_super)(struct super_block *, void *, int))
-{
- struct mtd_info *mtd;
-
- mtd = get_mtd_device(NULL, mtdnr);
- if (IS_ERR(mtd)) {
- pr_debug("MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
- return ERR_CAST(mtd);
- }
-
- return mount_mtd_aux(fs_type, flags, dev_name, data, mtd, fill_super);
-}
-
-/*
- * set up an MTD-based superblock
- */
-struct dentry *mount_mtd(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data,
- int (*fill_super)(struct super_block *, void *, int))
-{
-#ifdef CONFIG_BLOCK
- struct block_device *bdev;
- int ret, major;
-#endif
- int mtdnr;
-
- if (!dev_name)
- return ERR_PTR(-EINVAL);
-
- pr_debug("MTDSB: dev_name \"%s\"\n", dev_name);
-
- /* the preferred way of mounting in future; especially when
- * CONFIG_BLOCK=n - 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. */
- if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
- if (dev_name[3] == ':') {
- struct mtd_info *mtd;
-
- /* mount by MTD device name */
- pr_debug("MTDSB: mtd:%%s, name \"%s\"\n",
- dev_name + 4);
-
- mtd = get_mtd_device_nm(dev_name + 4);
- if (!IS_ERR(mtd))
- return mount_mtd_aux(
- fs_type, flags,
- dev_name, data, mtd,
- fill_super);
-
- printk(KERN_NOTICE "MTD:"
- " 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 */
- pr_debug("MTDSB: mtd%%d, mtdnr %d\n",
- mtdnr);
- return mount_mtd_nr(fs_type, flags,
- dev_name, data,
- mtdnr, fill_super);
- }
- }
- }
-
-#ifdef CONFIG_BLOCK
- /* try the old way - the hack where we allowed users to mount
- * /dev/mtdblock$(n) but didn't actually _use_ the blockdev
- */
- bdev = lookup_bdev(dev_name);
- if (IS_ERR(bdev)) {
- ret = PTR_ERR(bdev);
- pr_debug("MTDSB: lookup_bdev() returned %d\n", ret);
- return ERR_PTR(ret);
- }
- pr_debug("MTDSB: lookup_bdev() returned 0\n");
-
- ret = -EINVAL;
-
- major = MAJOR(bdev->bd_dev);
- mtdnr = MINOR(bdev->bd_dev);
- bdput(bdev);
-
- if (major != MTD_BLOCK_MAJOR)
- goto not_an_MTD_device;
-
- return mount_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super);
-
-not_an_MTD_device:
-#endif /* CONFIG_BLOCK */
-
- if (!(flags & SB_SILENT))
- printk(KERN_NOTICE
- "MTD: Attempt to mount non-MTD device \"%s\"\n",
- dev_name);
- return ERR_PTR(-EINVAL);
-}
-
-EXPORT_SYMBOL_GPL(mount_mtd);
-
/*
* destroy an MTD-based superblock
*/
projects / linux-2.6-microblaze.git / blobdiff