| 1 |
On Sun, Jun 02 2013, Alan Mackenzie wrote: |
| 2 |
|
| 3 |
> Hello, Jörg. |
| 4 |
> |
| 5 |
> On Sun, Jun 02, 2013 at 04:06:11PM +0200, Joerg Schilling wrote: |
| 6 |
>> Alan Mackenzie <acm@×××.de> wrote: |
| 7 |
> |
| 8 |
>> > The wikipedia page on Ext3 says that with a 1kB blocksize, the maximum |
| 9 |
>> > file size is 16GB, but with a 2kB blocksize it's 256GB. Could it be |
| 10 |
>> > you've somehow actually got a 1kB blocksize on the partition? |
| 11 |
> |
| 12 |
>> Where does such a strange limitation come from? |
| 13 |
> |
| 14 |
> Haven't a clue. I would have expected the maximum file size to be a |
| 15 |
> number of blocks, which makes it seem strange that doubling the block |
| 16 |
> size multiplies max file size by 16. |
| 17 |
|
| 18 |
|
| 19 |
The wonders of indirect blocks. When the blocksize doubles, a single |
| 20 |
indirect block points to twice as many direct blocks, each of which is |
| 21 |
double the size. For double indirect you get twice as many single |
| 22 |
indirect, etc. |
| 23 |
|
| 24 |
There are plenty of places to read about this. One is my lecture notes |
| 25 |
http://cs.nyu.edu/~gottlieb/courses/os/class-notes.html#inodes |
| 26 |
|
| 27 |
allan |
Archives