[PATCH 0/4] Use 64-bit inode numbers internally in the kernel

From: David Howells
Date: Mon Aug 14 2006 - 17:13:06 EST

These patches make the kernel use 64-bit inode numbers internally, even on a
32-bit system. They are required because some filesystems have intrinsic
64-bit inode numbers: NFS and XFS for example. The 64-bit inode numbers are
then propagated to userspace automatically where the arch supports it.

Problems have been seen with userspace (eg: ld.so) using the 64-bit inode
number returned by stat64() or getdents64() to differentiate files, and failing
because the 64-bit inode number space was compressed to 32-bits, and so
overlaps occur.

There are four patches:

(1) Supply __udivdi3() and __umoddi3() so that the compiler can do 64-bit
division and modulus. __udivmoddi4() is also supplied as the other two
are wrappers around that.

(2) Make __kernel_ino_t consistently typedef'd to "unsigned long long" on all

Where ino_t has been used in userspace facing structures (such as struct
stat), it has been replaced with whatever ino_t used to be defined as on
that arch.

struct inode::i_ino and struct kstat::ino are changed to ino_t type.

(3) Fix print format warnings in general code due to the change in type of
i_ino. These should now all carry an "ll" modifier.

(4) As for (3), but fix the CacheFiles code.

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