On 04/02/2012 08:17 PM, David Sterba wrote:
> On Mon, Apr 02, 2012 at 07:28:18PM +0800, Liu Bo wrote:
>> --- a/fs/btrfs/disk-io.c
>> +++ b/fs/btrfs/disk-io.c
>> @@ -2104,6 +2104,14 @@ int open_ctree(struct super_block *sb,
>> err = -EINVAL;
>> goto fail_alloc;
>> }
>> + if (btrfs_super_sectorsize(disk_super) > PAGE_CACHE_SIZE) {
>> + printk(KERN_ERR "BTRFS: couldn't mount because sectorsize(%d)"
>> + " was larger than PAGE_SIZE(%lu)\n",
>
> %llu
>
err, thanks for caching it.
>> + btrfs_super_sectorsize(disk_super),
>> + (unsigned long long)PAGE_CACHE_SIZE);
>> + err = -EINVAL;
>> + goto fail_alloc;
>> + }
>>
>> features = btrfs_super_incompat_flags(disk_super);
>> features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
>
> We have the opposite check a few lines below
>
> 2257 if (sectorsize < PAGE_SIZE) {
> 2258 printk(KERN_WARNING "btrfs: Incompatible sector size "
> 2259 "found on %s\n", sb->s_id);
> 2260 goto fail_sb_buffer;
> 2261 }
> 2262
>
> so sectorsize must be equal to PAGE_SIZE always and one check can catch
> both cases.
>
But this check is _useless_ when we have a sectorsize which is larger than
PAGE_SIZE,
we're not ready for that, too.
We already have one check, so I'll modify this instead. :)
thanks,
liubo
>
> david
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