On Jun 11, 2007 18:47 +0200, Valerie Clement wrote:
> +#ifdef _EXT4FS_
> +#define EXT4_EE_START(e) (((__u64)(e)->ee_start_hi << 32) + (e)->ee_start)
> +#define EXT4_EI_LEAF(ix) (((__u64)(ix)->ei_leaf_hi << 32) + (ix)->ei_leaf)
> +
> +#define EXT4_EE_START_SET(e,blk) \
> + do { \
> + (e)->ee_start = (blk); \
> + (e)->ee_start_hi = (blk) >> 32; \
> + } while(0)
> +
> +#define EXT4_EI_LEAF_SET(e,blk) \
> + do { \
> + (ix)->ei_leaf = (blk); \
> + (ix)->ei_leaf_hi = (blk) >> 32; \
> + } while(0)
> +#else
> +#define EXT4_EE_START(e) ((e)->ee_start)
> +#define EXT4_EI_LEAF(ix) ((ix)->ei_leaf)
> +
> +#define EXT4_EE_START_SET(e,blk) \
> + do { \
> + (e)->ee_start = (blk); \
> + } while(0)
> +
> +#define EXT4_EI_LEAF_SET(e,blk) \
> + do { \
> + (ix)->ei_leaf = (blk); \
> + } while(0)
> +#endif
Ideally this would also be conditional upon INCOMPAT_64BIT and the fs > 2^32
blocks, because some older versions of the extents code didn't clear the
ee_start_hi and ei_lead fields correctly.
That said, I'm not always sure we have access to a superblock somehow
in every function where we need this macro, and we've been shipping
extents patches and e2fsck which has fixed this problem, but not all of
our customers/partners are using the latest lustre or e2fsprogs, or
have necessarily run e2fsck on their filesystems..
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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