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xfs: encode the rtbitmap in big endian format

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Currently, the ondisk realtime bitmap file is accessed in units of
32-bit words.  There's no endian translation of the contents of this
file, which means that the Bad Things Happen(tm) if you go from (say)
x86 to powerpc.  Since we have a new feature flag, let's take the
opportunity to enforce an endianness on the file.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong
2024-11-03 20:19:23 -08:00
parent 118895aa95
commit eba42c2c53
2 changed files with 9 additions and 2 deletions
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4
fs/xfs/libxfs/xfs_format.h
View File

@@ -709,10 +709,12 @@ struct xfs_agfl {
/*
* Realtime bitmap information is accessed by the word, which is currently
* stored in host-endian format.
* stored in host-endian format. Starting with the realtime groups feature,
* the words are stored in be32 ondisk.
*/
union xfs_rtword_raw {
__u32 old;
__be32 rtg;
};
/*

7
fs/xfs/libxfs/xfs_rtbitmap.h
View File

@@ -210,6 +210,8 @@ xfs_rtbitmap_getword(
{
union xfs_rtword_raw *word = xfs_rbmblock_wordptr(args, index);
if (xfs_has_rtgroups(args->mp))
return be32_to_cpu(word->rtg);
return word->old;
}
@@ -222,7 +224,10 @@ xfs_rtbitmap_setword(
{
union xfs_rtword_raw *word = xfs_rbmblock_wordptr(args, index);
word->old = value;
if (xfs_has_rtgroups(args->mp))
word->rtg = cpu_to_be32(value);
else
word->old = value;
}
/*