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xfs: add a xfs_rtrmap_highest_rgbno helper

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Add a helper to find the last offset mapped in the rtrmap.  This will be
used by the zoned code to find out where to start writing again on
conventional devices without hardware zone support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig
2024-12-21 08:40:17 +00:00
parent f42c652434
commit aacde95a37
2 changed files with 21 additions and 0 deletions
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19
fs/xfs/libxfs/xfs_rtrmap_btree.c
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@@ -1033,3 +1033,22 @@ xfs_rtrmapbt_init_rtsb(
xfs_btree_del_cursor(cur, error);
return error;
}
/*
* Return the highest rgbno currently tracked by the rmap for this rtg.
*/
xfs_rgblock_t
xfs_rtrmap_highest_rgbno(
struct xfs_rtgroup *rtg)
{
struct xfs_btree_block *block = rtg_rmap(rtg)->i_df.if_broot;
union xfs_btree_key key = {};
struct xfs_btree_cur *cur;
if (block->bb_numrecs == 0)
return NULLRGBLOCK;
cur = xfs_rtrmapbt_init_cursor(NULL, rtg);
xfs_btree_get_keys(cur, block, &key);
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
return be32_to_cpu(key.__rmap_bigkey[1].rm_startblock);
}

2
fs/xfs/libxfs/xfs_rtrmap_btree.h
View File

@@ -207,4 +207,6 @@ struct xfs_btree_cur *xfs_rtrmapbt_mem_cursor(struct xfs_rtgroup *rtg,
int xfs_rtrmapbt_mem_init(struct xfs_mount *mp, struct xfbtree *xfbtree,
struct xfs_buftarg *btp, xfs_rgnumber_t rgno);
xfs_rgblock_t xfs_rtrmap_highest_rgbno(struct xfs_rtgroup *rtg);
#endif /* __XFS_RTRMAP_BTREE_H__ */