Bug 202799 - ext3 fails to mount a 16T filesystem due to overflows
ext3 fails to mount a 16T filesystem due to overflows
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Eric Sandeen
Brian Brock
Depends On: 202807
Blocks: 206721
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Reported: 2006-08-16 11:07 EDT by Eric Sandeen
Modified: 2007-11-30 17:11 EST (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2006-10-04 12:35:22 EDT
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Description Eric Sandeen 2006-08-16 11:07:10 EDT
Although patches recently went into the kernel to change block containers to
unsigned types, arithmetic on those types can still cause overflows.

This is immediately obvious at mount time, when attempting to mount a filesystem
with 2^32-1 blocks.*

Care must be taken when iterating over group descriptors, and calculating group
descriptor count, to not overflow towards the end of the filesystem.

These patches are now upstream in the -mm kernel, for ext2 and ext3.

*actually creating such a filesystem requires changes to e2fsprogs, addressed by
another bugzilla entry, still to come.
Comment 1 Jarod Wilson 2006-08-18 10:50:47 EDT
And for the record, said patches are working on two test boxes I've got.

# df -h /mnt/sparsefs/
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/sparsefs   16T   25G   15T   1% /mnt/sparsefs
Comment 2 Eric Sandeen 2006-10-04 12:35:22 EDT
in fc6 stream now.

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