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Re: DataBlock information Help

On 2010-03-18, at 16:48, MirJafar Ali wrote:
I am using e2fsprogs and found it very nice. I want to know datablocks for a given a given file. I was going through the document and did lots of google search, but I am not sure what is the best way to get this information. Which "e2fsprogs" function can give all the datablock IDs. There is one function i.e. ext2fs_block_iterate, but I am not sure how it works. It wasn't clear from the

If you use "dumpe2fs -c -R 'stat /path/to/file' /dev/XXX", where /path/ to/file is the filesystem relative pathname, that will dump all of the blocks.

On newer kernels you can also use "filefrag -v" to list the blocks, though the output format is less than ideal right now.

Programatically, on a newer kernel you can use the fiemap() API to get the list of all blocks for any file, regardless of the filesystem type.

Cheers, Andreas
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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