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xfs: create a sparse load xfarray function

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Create a new method to load an xfarray element from the xfile, but with
a twist.  If we've never stored to the array index, zero the caller's
buffer.  This will facilitate RMWs updates of records in a sparse array
without fuss, since the sparse xfarray convention is that uninitialized
array elements default to zeroes.

This is a separate patch to reduce the size of the upcoming quotacheck
patch.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-02-22 12:30:54 -08:00
parent ebd610fe82
commit 5a3ab58495
1 changed files with 19 additions and 0 deletions
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19
fs/xfs/scrub/xfarray.h
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@ -45,6 +45,25 @@ int xfarray_store(struct xfarray *array, xfarray_idx_t idx, const void *ptr);
int xfarray_store_anywhere(struct xfarray *array, const void *ptr);
bool xfarray_element_is_null(struct xfarray *array, const void *ptr);
/*
* Load an array element, but zero the buffer if there's no data because we
* haven't stored to that array element yet.
*/
static inline int
xfarray_load_sparse(
struct xfarray *array,
uint64_t idx,
void *rec)
{
int error = xfarray_load(array, idx, rec);
if (error == -ENODATA) {
memset(rec, 0, array->obj_size);
return 0;
}
return error;
}
/* Append an element to the array. */
static inline int xfarray_append(struct xfarray *array, const void *ptr)
{