2010/3/5 Eric Sandeen <sandeen@xxxxxxxxxx>
>
> > Thank you for pointing this out. I had not checked s_maxbytes.
> > Appearently s_maxbytes can be 1<<(32 + s_blocksize_bits) - 1. Therefore
> > the number of blocks in a file cannot be stored in a 32bit integer.
>
> For extent-based files it had better be....
>
> struct ext4_extent {
> __le32 ee_block; /* first logical block extent covers */
> __le16 ee_len; /* number of blocks covered by extent */
>
> The start block can't be more than 32 bits; this essentially limits
> the file size / maximum logical block to 2^32 blocks right?
>
> s_maxbytes comes out to 17592186044415
>
> 2^32 4k blocks is 17592186044416 bytes, or max byte offset 17592186044415
>
> What am I missing? (confusion between max byte count and max
> byte offset, perhaps?)
>
Yes. The block offset has the maximum value 1<<32 - 1.
However the number of blocks may be 1<<32.
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