diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/mtdsuper.c | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c index 3f9a3b7b12c5..c3e2098372f2 100644 --- a/drivers/mtd/mtdsuper.c +++ b/drivers/mtd/mtdsuper.c @@ -194,195 +194,6 @@ int get_tree_mtd(struct fs_context *fc, 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 */ void kill_mtd_super(struct super_block *sb) |