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Old 06-12-2015, 03:27 PM   #1
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How are reserved GDT used after online -resizing?

I am working on Ext3 and after looking at FS layout - ext3 reserves ~1024 blocks as Reserved Group Descriptor Table (reserved GDT blocks are between Group Descriptor blocks and Bitmap blocks). These blocks are used once we do online resizing. I was wondering - how these reserved blocks are used after online resizing is done? Are these free blocks used as data blocks or they can be used for other purposes as well? Also, what is the impact (apart from the fact that online -resizing will not work) if we don't leave any room for reserved GDT?

Last edited by yashgovin19; 06-12-2015 at 03:35 PM.
Old 06-13-2015, 05:30 AM   #2
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In ext2 - presumed to be similar...
The group descriptors are placed one after another and together they make the group descriptor table.
Each Blocks Group contains the entire table of group descriptors after its copy of the Superblock.
Only the first copy (in Block Group 0) is actually used by the EXT2 file system.
The other copies are there, like the copies of the Superblock, in case the main copy is corrupted.
(Taken from )


ext3, filesystem, linux

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