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xfs: only invalidate blocks if we're going to free them

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When we're discarding old btree blocks after a repair, only invalidate
the buffers for the ones that we're freeing -- if the metadata was
crosslinked with another data structure, we don't want to touch it.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-08-10 07:48:02 -07:00
parent e06ef14b9f
commit 8e54e06b5c
2 changed files with 42 additions and 55 deletions
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96
fs/xfs/scrub/reap.c
View file

@ -70,54 +70,10 @@
*
* The caller is responsible for locking the AG headers for the entire rebuild
* operation so that nothing else can sneak in and change the AG state while
* we're not looking. We also assume that the caller already invalidated any
* buffers associated with @bitmap.
* we're not looking. We must also invalidate any buffers associated with
* @bitmap.
*/
static int
xrep_invalidate_block(
uint64_t fsbno,
void *priv)
{
struct xfs_scrub *sc = priv;
struct xfs_buf *bp;
int error;
/* Skip AG headers and post-EOFS blocks */
if (!xfs_verify_fsbno(sc->mp, fsbno))
return 0;
error = xfs_buf_incore(sc->mp->m_ddev_targp,
XFS_FSB_TO_DADDR(sc->mp, fsbno),
XFS_FSB_TO_BB(sc->mp, 1), XBF_TRYLOCK, &bp);
if (error)
return 0;
xfs_trans_bjoin(sc->tp, bp);
xfs_trans_binval(sc->tp, bp);
return 0;
}
/*
* Invalidate buffers for per-AG btree blocks we're dumping. This function
* is not intended for use with file data repairs; we have bunmapi for that.
*/
int
xrep_invalidate_blocks(
struct xfs_scrub *sc,
struct xbitmap *bitmap)
{
/*
* For each block in each extent, see if there's an incore buffer for
* exactly that block; if so, invalidate it. The buffer cache only
* lets us look for one buffer at a time, so we have to look one block
* at a time. Avoid invalidating AG headers and post-EOFS blocks
* because we never own those; and if we can't TRYLOCK the buffer we
* assume it's owned by someone else.
*/
return xbitmap_walk_bits(bitmap, xrep_invalidate_block, sc);
}
/* Information about reaping extents after a repair. */
struct xrep_reap_state {
struct xfs_scrub *sc;
@ -127,9 +83,7 @@ struct xrep_reap_state {
enum xfs_ag_resv_type resv;
};
/*
* Put a block back on the AGFL.
*/
/* Put a block back on the AGFL. */
STATIC int
xrep_put_freelist(
struct xfs_scrub *sc,
@ -168,6 +122,37 @@ xrep_put_freelist(
return 0;
}
/* Try to invalidate the incore buffer for a block that we're about to free. */
STATIC void
xrep_block_reap_binval(
struct xfs_scrub *sc,
xfs_fsblock_t fsbno)
{
struct xfs_buf *bp = NULL;
int error;
/*
* If there's an incore buffer for exactly this block, invalidate it.
* Avoid invalidating AG headers and post-EOFS blocks because we never
* own those.
*/
if (!xfs_verify_fsbno(sc->mp, fsbno))
return;
/*
* We assume that the lack of any other known owners means that the
* buffer can be locked without risk of deadlocking.
*/
error = xfs_buf_incore(sc->mp->m_ddev_targp,
XFS_FSB_TO_DADDR(sc->mp, fsbno),
XFS_FSB_TO_BB(sc->mp, 1), 0, &bp);
if (error)
return;
xfs_trans_bjoin(sc->tp, bp);
xfs_trans_binval(sc->tp, bp);
}
/* Dispose of a single block. */
STATIC int
xrep_reap_block(
@ -225,14 +210,17 @@ xrep_reap_block(
* blow on writeout, the filesystem will shut down, and the admin gets
* to run xfs_repair.
*/
if (has_other_rmap)
error = xfs_rmap_free(sc->tp, agf_bp, sc->sa.pag, agbno,
1, rs->oinfo);
else if (rs->resv == XFS_AG_RESV_AGFL)
if (has_other_rmap) {
error = xfs_rmap_free(sc->tp, agf_bp, sc->sa.pag, agbno, 1,
rs->oinfo);
} else if (rs->resv == XFS_AG_RESV_AGFL) {
xrep_block_reap_binval(sc, fsbno);
error = xrep_put_freelist(sc, agbno);
else
} else {
xrep_block_reap_binval(sc, fsbno);
error = xfs_free_extent(sc->tp, sc->sa.pag, agbno, 1, rs->oinfo,
rs->resv);
}
if (agf_bp != sc->sa.agf_bp)
xfs_trans_brelse(sc->tp, agf_bp);
if (error)

1
fs/xfs/scrub/repair.h
View file

@ -28,7 +28,6 @@ struct xbitmap;
struct xagb_bitmap;
int xrep_fix_freelist(struct xfs_scrub *sc, bool can_shrink);
int xrep_invalidate_blocks(struct xfs_scrub *sc, struct xbitmap *btlist);
struct xrep_find_ag_btree {
/* in: rmap owner of the btree we're looking for */