Commit 941b2ddf authored Nov 29, 2011 by Keith Mannthey Committed by David Sterba Feb 15, 2012

btrfs: Sector Size check during Mount



Gracefully fail when trying to mount a BTRFS file system that has a
sectorsize smaller than PAGE_SIZE.

On PPC it is possible to build a FS while using a 4k PAGE_SIZE kernel
then boot into a 64K PAGE_SIZE kernel.  Presently open_ctree fails in an
endless loop and hangs the machine in this situation.

My debugging has show this Sector size < Page size to be a non trivial
situation and a graceful exit from the situation would be nice for the
time being.

Signed-off-by: Keith Mannthey <kmannth@us.ibm.com>

parent d98456fc

fs/btrfs/disk-io.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -2258,6 +2258,12 @@ struct btrfs_root open_ctree(struct super_block sb,
		goto fail_sb_buffer;
		}

		if (sectorsize < PAGE_SIZE) {
		printk(KERN_WARNING "btrfs: Incompatible sector size "
		"found on %s\n", sb->s_id);
		goto fail_sb_buffer;
		}

		mutex_lock(&fs_info->chunk_mutex);
		ret = btrfs_read_sys_array(tree_root);
		mutex_unlock(&fs_info->chunk_mutex);

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