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Ext2: Difference between revisions
→Base Superblock Fields: clarify the superblock block number field is also the starting block number
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(→Base Superblock Fields: clarify the superblock block number field is also the starting block number) |
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| 16 || 19 || 4 || Total number of unallocated inodes
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| 20 || 23 || 4 || Block number of the block containing the superblock (also the starting block number, NOT always zero.)
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| 24 || 27 || 4 || ''log''<sub>2</sub> (block size) - 10. (In other words, the number to shift 1,024 to the left by to obtain the block size)
Line 300:
'''Triply Indirect Block Pointer''': Lastly, if a file needs still more space, it can use a triple indirect block. Again, this is an extension of the double indirect block. So, a triple indirect block contains addresses of double indirect blocks, which contain addresses of single indirect blocks, which contain address of data blocks. The inode structure has a "Triply Indirect Block Pointer" field that points to this block if present.
[http://en.wikipedia.org/wiki/File:Ext2-inode.gif This image from Wikipedia] illustrates what is described above pretty well.
=== Inode Data Structure ===
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