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xfs: introduce xfs_for_each_perag_wrap()

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In several places we iterate every AG from a specific start agno and
wrap back to the first AG when we reach the end of the filesystem to
continue searching. We don't have a primitive for this iteration
yet, so add one for conversion of these algorithms to per-ag based
iteration.

The filestream AG select code is a mess, and this initially makes it
worse. The per-ag selection needs to be driven completely into the
filestream code to clean this up and it will be done in a future
patch that makes the filestream allocator use active per-ag
references correctly.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner
2023-02-13 09:14:53 +11:00
parent 7ac2ff8bb3
commit 76257a1587
3 changed files with 107 additions and 52 deletions
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45
fs/xfs/libxfs/xfs_ag.h
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@ -237,7 +237,6 @@ xfs_perag_next(
#define for_each_perag_from(mp, agno, pag) \
for_each_perag_range((mp), (agno), (mp)->m_sb.sb_agcount - 1, (pag))
#define for_each_perag(mp, agno, pag) \
(agno) = 0; \
for_each_perag_from((mp), (agno), (pag))
@ -249,6 +248,50 @@ xfs_perag_next(
xfs_perag_rele(pag), \
(pag) = xfs_perag_grab_tag((mp), (agno), (tag)))
static inline struct xfs_perag *
xfs_perag_next_wrap(
struct xfs_perag *pag,
xfs_agnumber_t *agno,
xfs_agnumber_t stop_agno,
xfs_agnumber_t wrap_agno)
{
struct xfs_mount *mp = pag->pag_mount;
*agno = pag->pag_agno + 1;
xfs_perag_rele(pag);
while (*agno != stop_agno) {
if (*agno >= wrap_agno)
*agno = 0;
if (*agno == stop_agno)
break;
pag = xfs_perag_grab(mp, *agno);
if (pag)
return pag;
(*agno)++;
}
return NULL;
}
/*
* Iterate all AGs from start_agno through wrap_agno, then 0 through
* (start_agno - 1).
*/
#define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) \
for ((agno) = (start_agno), (pag) = xfs_perag_grab((mp), (agno)); \
(pag) != NULL; \
(pag) = xfs_perag_next_wrap((pag), &(agno), (start_agno), \
(wrap_agno)))
/*
* Iterate all AGs from start_agno through to the end of the filesystem, then 0
* through (start_agno - 1).
*/
#define for_each_perag_wrap(mp, start_agno, agno, pag) \
for_each_perag_wrap_at((mp), (start_agno), (mp)->m_sb.sb_agcount, \
(agno), (pag))
struct aghdr_init_data {
/* per ag data */
xfs_agblock_t agno; /* ag to init */