On Wed, 09 Jan 2008 07:40:12 +0300, Al Boldi said: > But why wouldn't it be possible to do this on the current fs infrastructure, > using just a smart fsck, working incrementally on some sub-dir?
If you have /home/usera, /home/userb, and /home/userc, the vast majority of fs screw-ups can't be detected by only looking at one sub-dir. For example, you can't tell definitively that all blocks referenced by an inode under /home/usera are properly only allocated to one file until you *also* look at the inodes under user[bc]. Heck, you can't even tell if the link count for a file is correct unless you walk the entire filesystem - you can find a file with a link count of 3 in the inode, and you find one reference under usera, and a second under userb - you can't tell if the count is one too high or not until you walk through userc and actually see (or fail to see) a third directory entry referencing it.
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