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xfs: add a xfs_group_next_range helper

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Add a helper to iterate over iterate over all groups, which can be used
as a simple while loop:

	struct xfs_group		*xg = NULL;

	while ((xg = xfs_group_next_range(mp, xg, 0, MAX_GROUP))) {
		...
	}

This will be wrapped by the realtime group code first, and eventually
replace the for_each_rtgroup_from and for_each_rtgroup_range helpers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-11-03 20:18:39 -08:00 committed by Darrick J. Wong
parent e9c4d8bfb2
commit 819928770b
2 changed files with 29 additions and 0 deletions
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26
fs/xfs/libxfs/xfs_group.c
View File

@ -87,6 +87,32 @@ xfs_group_grab(
return xg;
}
/*
* Iterate to the next group. To start the iteration at @start_index, a %NULL
* @xg is passed, else the previous group returned from this function. The
* caller should break out of the loop when this returns %NULL. If the caller
* wants to break out of a loop that did not finish it needs to release the
* active reference to @xg using xfs_group_rele() itself.
*/
struct xfs_group *
xfs_group_next_range(
struct xfs_mount *mp,
struct xfs_group *xg,
uint32_t start_index,
uint32_t end_index,
enum xfs_group_type type)
{
uint32_t index = start_index;
if (xg) {
index = xg->xg_gno + 1;
xfs_group_rele(xg);
}
if (index > end_index)
return NULL;
return xfs_group_grab(mp, index, type);
}
/*
* Find the next group after @xg, or the first group if @xg is NULL.
*/

3
fs/xfs/libxfs/xfs_group.h
View File

@ -20,6 +20,9 @@ void xfs_group_put(struct xfs_group *xg);
struct xfs_group *xfs_group_grab(struct xfs_mount *mp, uint32_t index,
enum xfs_group_type type);
struct xfs_group *xfs_group_next_range(struct xfs_mount *mp,
struct xfs_group *xg, uint32_t start_index, uint32_t end_index,
enum xfs_group_type type);
struct xfs_group *xfs_group_grab_next_mark(struct xfs_mount *mp,
struct xfs_group *xg, xa_mark_t mark, enum xfs_group_type type);
void xfs_group_rele(struct xfs_group *xg);