* [PATCH 1/3] xfs: remove the for_each_xbitmap_ helpers
2022-10-02 18:20 [PATCHSET v23.1 0/3] xfs: rework online fsck incore bitmap Darrick J. Wong
@ 2022-10-02 18:20 ` Darrick J. Wong
2022-10-02 18:20 ` [PATCH 2/3] xfs: drop the _safe behavior from the xbitmap foreach macro Darrick J. Wong
2022-10-02 18:20 ` [PATCH 3/3] xfs: convert xbitmap to interval tree Darrick J. Wong
2 siblings, 0 replies; 5+ messages in thread
From: Darrick J. Wong @ 2022-10-02 18:20 UTC (permalink / raw)
To: djwong; +Cc: linux-xfs
From: Darrick J. Wong <djwong@kernel.org>
Remove the for_each_xbitmap_ macros in favor of proper iterator
functions. We'll soon be switching this data structure over to an
interval tree implementation, which means that we can't allow callers to
modify the bitmap during iteration without telling us.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
| 89 ++++++++++++++++++++---------------
fs/xfs/scrub/bitmap.c | 59 +++++++++++++++++++++++
fs/xfs/scrub/bitmap.h | 22 ++++++---
fs/xfs/scrub/repair.c | 102 ++++++++++++++++++++++------------------
4 files changed, 179 insertions(+), 93 deletions(-)
--git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index d75d82151eeb..26bce2f12b09 100644
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -486,10 +486,11 @@ xrep_agfl_walk_rmap(
/* Strike out the blocks that are cross-linked according to the rmapbt. */
STATIC int
xrep_agfl_check_extent(
- struct xrep_agfl *ra,
uint64_t start,
- uint64_t len)
+ uint64_t len,
+ void *priv)
{
+ struct xrep_agfl *ra = priv;
xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(ra->sc->mp, start);
xfs_agblock_t last_agbno = agbno + len - 1;
int error;
@@ -537,7 +538,6 @@ xrep_agfl_collect_blocks(
struct xrep_agfl ra;
struct xfs_mount *mp = sc->mp;
struct xfs_btree_cur *cur;
- struct xbitmap_range *br, *n;
int error;
ra.sc = sc;
@@ -578,11 +578,7 @@ xrep_agfl_collect_blocks(
/* Strike out the blocks that are cross-linked. */
ra.rmap_cur = xfs_rmapbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.pag);
- for_each_xbitmap_extent(br, n, agfl_extents) {
- error = xrep_agfl_check_extent(&ra, br->start, br->len);
- if (error)
- break;
- }
+ error = xbitmap_walk(agfl_extents, xrep_agfl_check_extent, &ra);
xfs_btree_del_cursor(ra.rmap_cur, error);
if (error)
goto out_bmp;
@@ -628,6 +624,43 @@ xrep_agfl_update_agf(
XFS_AGF_FLFIRST | XFS_AGF_FLLAST | XFS_AGF_FLCOUNT);
}
+struct xrep_agfl_fill {
+ struct xbitmap used_extents;
+ struct xfs_scrub *sc;
+ __be32 *agfl_bno;
+ xfs_agblock_t flcount;
+ unsigned int fl_off;
+};
+
+/* Fill the AGFL with whatever blocks are in this extent. */
+static int
+xrep_agfl_fill(
+ uint64_t start,
+ uint64_t len,
+ void *priv)
+{
+ struct xrep_agfl_fill *af = priv;
+ struct xfs_scrub *sc = af->sc;
+ xfs_fsblock_t fsbno = start;
+ int error;
+
+ while (fsbno < start + len && af->fl_off < af->flcount)
+ af->agfl_bno[af->fl_off++] =
+ cpu_to_be32(XFS_FSB_TO_AGBNO(sc->mp, fsbno++));
+
+ trace_xrep_agfl_insert(sc->mp, sc->sa.pag->pag_agno,
+ XFS_FSB_TO_AGBNO(sc->mp, start), len);
+
+ error = xbitmap_set(&af->used_extents, start, fsbno - 1);
+ if (error)
+ return error;
+
+ if (af->fl_off == af->flcount)
+ return -ECANCELED;
+
+ return 0;
+}
+
/* Write out a totally new AGFL. */
STATIC void
xrep_agfl_init_header(
@@ -636,13 +669,12 @@ xrep_agfl_init_header(
struct xbitmap *agfl_extents,
xfs_agblock_t flcount)
{
+ struct xrep_agfl_fill af = {
+ .sc = sc,
+ .flcount = flcount,
+ };
struct xfs_mount *mp = sc->mp;
- __be32 *agfl_bno;
- struct xbitmap_range *br;
- struct xbitmap_range *n;
struct xfs_agfl *agfl;
- xfs_agblock_t agbno;
- unsigned int fl_off;
ASSERT(flcount <= xfs_agfl_size(mp));
@@ -661,36 +693,15 @@ xrep_agfl_init_header(
* blocks than fit in the AGFL, they will be freed in a subsequent
* step.
*/
- fl_off = 0;
- agfl_bno = xfs_buf_to_agfl_bno(agfl_bp);
- for_each_xbitmap_extent(br, n, agfl_extents) {
- agbno = XFS_FSB_TO_AGBNO(mp, br->start);
-
- trace_xrep_agfl_insert(mp, sc->sa.pag->pag_agno, agbno,
- br->len);
-
- while (br->len > 0 && fl_off < flcount) {
- agfl_bno[fl_off] = cpu_to_be32(agbno);
- fl_off++;
- agbno++;
-
- /*
- * We've now used br->start by putting it in the AGFL,
- * so bump br so that we don't reap the block later.
- */
- br->start++;
- br->len--;
- }
-
- if (br->len)
- break;
- list_del(&br->list);
- kfree(br);
- }
+ xbitmap_init(&af.used_extents);
+ af.agfl_bno = xfs_buf_to_agfl_bno(agfl_bp),
+ xbitmap_walk(agfl_extents, xrep_agfl_fill, &af);
+ xbitmap_disunion(agfl_extents, &af.used_extents);
/* Write new AGFL to disk. */
xfs_trans_buf_set_type(sc->tp, agfl_bp, XFS_BLFT_AGFL_BUF);
xfs_trans_log_buf(sc->tp, agfl_bp, 0, BBTOB(agfl_bp->b_length) - 1);
+ xbitmap_destroy(&af.used_extents);
}
/* Repair the AGFL. */
diff --git a/fs/xfs/scrub/bitmap.c b/fs/xfs/scrub/bitmap.c
index a255f09e9f0a..d32ded56da90 100644
--- a/fs/xfs/scrub/bitmap.c
+++ b/fs/xfs/scrub/bitmap.c
@@ -13,6 +13,9 @@
#include "scrub/scrub.h"
#include "scrub/bitmap.h"
+#define for_each_xbitmap_extent(bex, n, bitmap) \
+ list_for_each_entry_safe((bex), (n), &(bitmap)->list, list)
+
/*
* Set a range of this bitmap. Caller must ensure the range is not set.
*
@@ -313,3 +316,59 @@ xbitmap_hweight(
return ret;
}
+
+/* Call a function for every run of set bits in this bitmap. */
+int
+xbitmap_walk(
+ struct xbitmap *bitmap,
+ xbitmap_walk_fn fn,
+ void *priv)
+{
+ struct xbitmap_range *bex, *n;
+ int error = 0;
+
+ for_each_xbitmap_extent(bex, n, bitmap) {
+ error = fn(bex->start, bex->len, priv);
+ if (error)
+ break;
+ }
+
+ return error;
+}
+
+struct xbitmap_walk_bits {
+ xbitmap_walk_bits_fn fn;
+ void *priv;
+};
+
+/* Walk all the bits in a run. */
+static int
+xbitmap_walk_bits_in_run(
+ uint64_t start,
+ uint64_t len,
+ void *priv)
+{
+ struct xbitmap_walk_bits *wb = priv;
+ uint64_t i;
+ int error = 0;
+
+ for (i = start; i < start + len; i++) {
+ error = wb->fn(i, wb->priv);
+ if (error)
+ break;
+ }
+
+ return error;
+}
+
+/* Call a function for every set bit in this bitmap. */
+int
+xbitmap_walk_bits(
+ struct xbitmap *bitmap,
+ xbitmap_walk_bits_fn fn,
+ void *priv)
+{
+ struct xbitmap_walk_bits wb = {.fn = fn, .priv = priv};
+
+ return xbitmap_walk(bitmap, xbitmap_walk_bits_in_run, &wb);
+}
diff --git a/fs/xfs/scrub/bitmap.h b/fs/xfs/scrub/bitmap.h
index 900646b72de1..53601d281ffb 100644
--- a/fs/xfs/scrub/bitmap.h
+++ b/fs/xfs/scrub/bitmap.h
@@ -19,13 +19,6 @@ struct xbitmap {
void xbitmap_init(struct xbitmap *bitmap);
void xbitmap_destroy(struct xbitmap *bitmap);
-#define for_each_xbitmap_extent(bex, n, bitmap) \
- list_for_each_entry_safe((bex), (n), &(bitmap)->list, list)
-
-#define for_each_xbitmap_block(b, bex, n, bitmap) \
- list_for_each_entry_safe((bex), (n), &(bitmap)->list, list) \
- for ((b) = (bex)->start; (b) < (bex)->start + (bex)->len; (b)++)
-
int xbitmap_set(struct xbitmap *bitmap, uint64_t start, uint64_t len);
int xbitmap_disunion(struct xbitmap *bitmap, struct xbitmap *sub);
int xbitmap_set_btcur_path(struct xbitmap *bitmap,
@@ -34,4 +27,19 @@ int xbitmap_set_btblocks(struct xbitmap *bitmap,
struct xfs_btree_cur *cur);
uint64_t xbitmap_hweight(struct xbitmap *bitmap);
+/*
+ * Return codes for the bitmap iterator functions are 0 to continue iterating,
+ * and non-zero to stop iterating. Any non-zero value will be passed up to the
+ * iteration caller. The special value -ECANCELED can be used to stop
+ * iteration, because neither bitmap iterator ever generates that error code on
+ * its own. Callers must not modify the bitmap while walking it.
+ */
+typedef int (*xbitmap_walk_fn)(uint64_t start, uint64_t len, void *priv);
+int xbitmap_walk(struct xbitmap *bitmap, xbitmap_walk_fn fn,
+ void *priv);
+
+typedef int (*xbitmap_walk_bits_fn)(uint64_t bit, void *priv);
+int xbitmap_walk_bits(struct xbitmap *bitmap, xbitmap_walk_bits_fn fn,
+ void *priv);
+
#endif /* __XFS_SCRUB_BITMAP_H__ */
diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c
index be65357285e6..8107a5470b71 100644
--- a/fs/xfs/scrub/repair.c
+++ b/fs/xfs/scrub/repair.c
@@ -445,6 +445,30 @@ xrep_init_btblock(
* 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.
@@ -454,11 +478,6 @@ xrep_invalidate_blocks(
struct xfs_scrub *sc,
struct xbitmap *bitmap)
{
- struct xbitmap_range *bmr;
- struct xbitmap_range *n;
- struct xfs_buf *bp;
- xfs_fsblock_t fsbno;
-
/*
* 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
@@ -467,23 +486,7 @@ xrep_invalidate_blocks(
* because we never own those; and if we can't TRYLOCK the buffer we
* assume it's owned by someone else.
*/
- for_each_xbitmap_block(fsbno, bmr, n, bitmap) {
- int error;
-
- /* Skip AG headers and post-EOFS blocks */
- if (!xfs_verify_fsbno(sc->mp, fsbno))
- continue;
- 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)
- continue;
-
- xfs_trans_bjoin(sc->tp, bp);
- xfs_trans_binval(sc->tp, bp);
- }
-
- return 0;
+ return xbitmap_walk_bits(bitmap, xrep_invalidate_block, sc);
}
/* Ensure the freelist is the correct size. */
@@ -504,6 +507,15 @@ xrep_fix_freelist(
can_shrink ? 0 : XFS_ALLOC_FLAG_NOSHRINK);
}
+/* Information about reaping extents after a repair. */
+struct xrep_reap_state {
+ struct xfs_scrub *sc;
+
+ /* Reverse mapping owner and metadata reservation type. */
+ const struct xfs_owner_info *oinfo;
+ enum xfs_ag_resv_type resv;
+};
+
/*
* Put a block back on the AGFL.
*/
@@ -548,17 +560,23 @@ xrep_put_freelist(
/* Dispose of a single block. */
STATIC int
xrep_reap_block(
- struct xfs_scrub *sc,
- xfs_fsblock_t fsbno,
- const struct xfs_owner_info *oinfo,
- enum xfs_ag_resv_type resv)
+ uint64_t fsbno,
+ void *priv)
{
+ struct xrep_reap_state *rs = priv;
+ struct xfs_scrub *sc = rs->sc;
struct xfs_btree_cur *cur;
struct xfs_buf *agf_bp = NULL;
xfs_agblock_t agbno;
bool has_other_rmap;
int error;
+ ASSERT(sc->ip != NULL ||
+ XFS_FSB_TO_AGNO(sc->mp, fsbno) == sc->sa.pag->pag_agno);
+ trace_xrep_dispose_btree_extent(sc->mp,
+ XFS_FSB_TO_AGNO(sc->mp, fsbno),
+ XFS_FSB_TO_AGBNO(sc->mp, fsbno), 1);
+
agbno = XFS_FSB_TO_AGBNO(sc->mp, fsbno);
ASSERT(XFS_FSB_TO_AGNO(sc->mp, fsbno) == sc->sa.pag->pag_agno);
@@ -577,7 +595,8 @@ xrep_reap_block(
cur = xfs_rmapbt_init_cursor(sc->mp, sc->tp, agf_bp, sc->sa.pag);
/* Can we find any other rmappings? */
- error = xfs_rmap_has_other_keys(cur, agbno, 1, oinfo, &has_other_rmap);
+ error = xfs_rmap_has_other_keys(cur, agbno, 1, rs->oinfo,
+ &has_other_rmap);
xfs_btree_del_cursor(cur, error);
if (error)
goto out_free;
@@ -597,11 +616,11 @@ xrep_reap_block(
*/
if (has_other_rmap)
error = xfs_rmap_free(sc->tp, agf_bp, sc->sa.pag, agbno,
- 1, oinfo);
- else if (resv == XFS_AG_RESV_AGFL)
+ 1, rs->oinfo);
+ else if (rs->resv == XFS_AG_RESV_AGFL)
error = xrep_put_freelist(sc, agbno);
else
- error = xfs_free_extent(sc->tp, fsbno, 1, oinfo, resv);
+ error = xfs_free_extent(sc->tp, fsbno, 1, rs->oinfo, rs->resv);
if (agf_bp != sc->sa.agf_bp)
xfs_trans_brelse(sc->tp, agf_bp);
if (error)
@@ -625,26 +644,15 @@ xrep_reap_extents(
const struct xfs_owner_info *oinfo,
enum xfs_ag_resv_type type)
{
- struct xbitmap_range *bmr;
- struct xbitmap_range *n;
- xfs_fsblock_t fsbno;
- int error = 0;
+ struct xrep_reap_state rs = {
+ .sc = sc,
+ .oinfo = oinfo,
+ .resv = type,
+ };
ASSERT(xfs_has_rmapbt(sc->mp));
- for_each_xbitmap_block(fsbno, bmr, n, bitmap) {
- ASSERT(sc->ip != NULL ||
- XFS_FSB_TO_AGNO(sc->mp, fsbno) == sc->sa.pag->pag_agno);
- trace_xrep_dispose_btree_extent(sc->mp,
- XFS_FSB_TO_AGNO(sc->mp, fsbno),
- XFS_FSB_TO_AGBNO(sc->mp, fsbno), 1);
-
- error = xrep_reap_block(sc, fsbno, oinfo, type);
- if (error)
- break;
- }
-
- return error;
+ return xbitmap_walk_bits(bitmap, xrep_reap_block, &rs);
}
/*
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 3/3] xfs: convert xbitmap to interval tree
2022-10-02 18:20 [PATCHSET v23.1 0/3] xfs: rework online fsck incore bitmap Darrick J. Wong
2022-10-02 18:20 ` [PATCH 1/3] xfs: remove the for_each_xbitmap_ helpers Darrick J. Wong
2022-10-02 18:20 ` [PATCH 2/3] xfs: drop the _safe behavior from the xbitmap foreach macro Darrick J. Wong
@ 2022-10-02 18:20 ` Darrick J. Wong
2 siblings, 0 replies; 5+ messages in thread
From: Darrick J. Wong @ 2022-10-02 18:20 UTC (permalink / raw)
To: djwong; +Cc: linux-xfs
From: Darrick J. Wong <djwong@kernel.org>
Convert the xbitmap code to use interval trees instead of linked lists.
This reduces the amount of coding required to handle the disunion
operation and in the future will make it easier to set bits in arbitrary
order yet later be able to extract maximally sized extents, which we'll
need for rebuilding certain structures. We define our own interval tree
type so that it can deal with 64-bit indices even on 32-bit machines.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
| 12 +
fs/xfs/scrub/bitmap.c | 323 ++++++++++++++++++++++------------------
fs/xfs/scrub/bitmap.h | 11 -
3 files changed, 187 insertions(+), 159 deletions(-)
--git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index 26bce2f12b09..c22dc71fdd82 100644
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -662,7 +662,7 @@ xrep_agfl_fill(
}
/* Write out a totally new AGFL. */
-STATIC void
+STATIC int
xrep_agfl_init_header(
struct xfs_scrub *sc,
struct xfs_buf *agfl_bp,
@@ -675,6 +675,7 @@ xrep_agfl_init_header(
};
struct xfs_mount *mp = sc->mp;
struct xfs_agfl *agfl;
+ int error;
ASSERT(flcount <= xfs_agfl_size(mp));
@@ -696,12 +697,15 @@ xrep_agfl_init_header(
xbitmap_init(&af.used_extents);
af.agfl_bno = xfs_buf_to_agfl_bno(agfl_bp),
xbitmap_walk(agfl_extents, xrep_agfl_fill, &af);
- xbitmap_disunion(agfl_extents, &af.used_extents);
+ error = xbitmap_disunion(agfl_extents, &af.used_extents);
+ if (error)
+ return error;
/* Write new AGFL to disk. */
xfs_trans_buf_set_type(sc->tp, agfl_bp, XFS_BLFT_AGFL_BUF);
xfs_trans_log_buf(sc->tp, agfl_bp, 0, BBTOB(agfl_bp->b_length) - 1);
xbitmap_destroy(&af.used_extents);
+ return 0;
}
/* Repair the AGFL. */
@@ -754,7 +758,9 @@ xrep_agfl(
* buffers until we know that part works.
*/
xrep_agfl_update_agf(sc, agf_bp, flcount);
- xrep_agfl_init_header(sc, agfl_bp, &agfl_extents, flcount);
+ error = xrep_agfl_init_header(sc, agfl_bp, &agfl_extents, flcount);
+ if (error)
+ goto err;
/*
* Ok, the AGFL should be ready to go now. Roll the transaction to
diff --git a/fs/xfs/scrub/bitmap.c b/fs/xfs/scrub/bitmap.c
index f8ebc4d61462..1b04d2ce020a 100644
--- a/fs/xfs/scrub/bitmap.c
+++ b/fs/xfs/scrub/bitmap.c
@@ -13,31 +13,160 @@
#include "scrub/scrub.h"
#include "scrub/bitmap.h"
+#include <linux/interval_tree_generic.h>
+
+struct xbitmap_node {
+ struct rb_node bn_rbnode;
+
+ /* First set bit of this interval and subtree. */
+ uint64_t bn_start;
+
+ /* Last set bit of this interval. */
+ uint64_t bn_last;
+
+ /* Last set bit of this subtree. Do not touch this. */
+ uint64_t __bn_subtree_last;
+};
+
+/* Define our own interval tree type with uint64_t parameters. */
+
+#define START(node) ((node)->bn_start)
+#define LAST(node) ((node)->bn_last)
+
+/*
+ * These functions are defined by the INTERVAL_TREE_DEFINE macro, but we'll
+ * forward-declare them anyway for clarity.
+ */
+static inline void
+xbitmap_tree_insert(struct xbitmap_node *node, struct rb_root_cached *root);
+
+static inline void
+xbitmap_tree_remove(struct xbitmap_node *node, struct rb_root_cached *root);
+
+static inline struct xbitmap_node *
+xbitmap_tree_iter_first(struct rb_root_cached *root, uint64_t start,
+ uint64_t last);
+
+static inline struct xbitmap_node *
+xbitmap_tree_iter_next(struct xbitmap_node *node, uint64_t start,
+ uint64_t last);
+
+INTERVAL_TREE_DEFINE(struct xbitmap_node, bn_rbnode, uint64_t,
+ __bn_subtree_last, START, LAST, static inline, xbitmap_tree)
+
/* Iterate each interval of a bitmap. Do not change the bitmap. */
-#define for_each_xbitmap_extent(bex, bitmap) \
- list_for_each_entry((bex), &(bitmap)->list, list)
-
-/*
- * Set a range of this bitmap. Caller must ensure the range is not set.
- *
- * This is the logical equivalent of bitmap |= mask(start, len).
- */
+#define for_each_xbitmap_extent(bn, bitmap) \
+ for ((bn) = rb_entry_safe(rb_first(&(bitmap)->xb_root.rb_root), \
+ struct xbitmap_node, bn_rbnode); \
+ (bn) != NULL; \
+ (bn) = rb_entry_safe(rb_next(&(bn)->bn_rbnode), \
+ struct xbitmap_node, bn_rbnode))
+
+/* Clear a range of this bitmap. */
+int
+xbitmap_clear(
+ struct xbitmap *bitmap,
+ uint64_t start,
+ uint64_t len)
+{
+ struct xbitmap_node *bn;
+ struct xbitmap_node *new_bn;
+ uint64_t last = start + len - 1;
+
+ while ((bn = xbitmap_tree_iter_first(&bitmap->xb_root, start, last))) {
+ if (bn->bn_start < start && bn->bn_last > last) {
+ uint64_t old_last = bn->bn_last;
+
+ /* overlaps with the entire clearing range */
+ xbitmap_tree_remove(bn, &bitmap->xb_root);
+ bn->bn_last = start - 1;
+ xbitmap_tree_insert(bn, &bitmap->xb_root);
+
+ /* add an extent */
+ new_bn = kmalloc(sizeof(struct xbitmap_node),
+ XCHK_GFP_FLAGS);
+ if (!new_bn)
+ return -ENOMEM;
+ new_bn->bn_start = last + 1;
+ new_bn->bn_last = old_last;
+ xbitmap_tree_insert(new_bn, &bitmap->xb_root);
+ } else if (bn->bn_start < start) {
+ /* overlaps with the left side of the clearing range */
+ xbitmap_tree_remove(bn, &bitmap->xb_root);
+ bn->bn_last = start - 1;
+ xbitmap_tree_insert(bn, &bitmap->xb_root);
+ } else if (bn->bn_last > last) {
+ /* overlaps with the right side of the clearing range */
+ xbitmap_tree_remove(bn, &bitmap->xb_root);
+ bn->bn_start = last + 1;
+ xbitmap_tree_insert(bn, &bitmap->xb_root);
+ break;
+ } else {
+ /* in the middle of the clearing range */
+ xbitmap_tree_remove(bn, &bitmap->xb_root);
+ kfree(bn);
+ }
+ }
+
+ return 0;
+}
+
+/* Set a range of this bitmap. */
int
xbitmap_set(
struct xbitmap *bitmap,
uint64_t start,
uint64_t len)
{
- struct xbitmap_range *bmr;
+ struct xbitmap_node *left;
+ struct xbitmap_node *right;
+ uint64_t last = start + len - 1;
+ int error;
- bmr = kmalloc(sizeof(struct xbitmap_range), XCHK_GFP_FLAGS);
- if (!bmr)
- return -ENOMEM;
+ /* Is this whole range already set? */
+ left = xbitmap_tree_iter_first(&bitmap->xb_root, start, last);
+ if (left && left->bn_start <= start && left->bn_last >= last)
+ return 0;
- INIT_LIST_HEAD(&bmr->list);
- bmr->start = start;
- bmr->len = len;
- list_add_tail(&bmr->list, &bitmap->list);
+ /* Clear out everything in the range we want to set. */
+ error = xbitmap_clear(bitmap, start, len);
+ if (error)
+ return error;
+
+ /* Do we have a left-adjacent extent? */
+ left = xbitmap_tree_iter_first(&bitmap->xb_root, start - 1, start - 1);
+ ASSERT(!left || left->bn_last + 1 == start);
+
+ /* Do we have a right-adjacent extent? */
+ right = xbitmap_tree_iter_first(&bitmap->xb_root, last + 1, last + 1);
+ ASSERT(!right || right->bn_start == last + 1);
+
+ if (left && right) {
+ /* combine left and right adjacent extent */
+ xbitmap_tree_remove(left, &bitmap->xb_root);
+ xbitmap_tree_remove(right, &bitmap->xb_root);
+ left->bn_last = right->bn_last;
+ xbitmap_tree_insert(left, &bitmap->xb_root);
+ kfree(right);
+ } else if (left) {
+ /* combine with left extent */
+ xbitmap_tree_remove(left, &bitmap->xb_root);
+ left->bn_last = last;
+ xbitmap_tree_insert(left, &bitmap->xb_root);
+ } else if (right) {
+ /* combine with right extent */
+ xbitmap_tree_remove(right, &bitmap->xb_root);
+ right->bn_start = start;
+ xbitmap_tree_insert(right, &bitmap->xb_root);
+ } else {
+ /* add an extent */
+ left = kmalloc(sizeof(struct xbitmap_node), XCHK_GFP_FLAGS);
+ if (!left)
+ return -ENOMEM;
+ left->bn_start = start;
+ left->bn_last = last;
+ xbitmap_tree_insert(left, &bitmap->xb_root);
+ }
return 0;
}
@@ -47,11 +176,11 @@ void
xbitmap_destroy(
struct xbitmap *bitmap)
{
- struct xbitmap_range *bmr, *n;
+ struct xbitmap_node *bn;
- list_for_each_entry_safe(bmr, n, &bitmap->list, list) {
- list_del(&bmr->list);
- kfree(bmr);
+ while ((bn = xbitmap_tree_iter_first(&bitmap->xb_root, 0, -1ULL))) {
+ xbitmap_tree_remove(bn, &bitmap->xb_root);
+ kfree(bn);
}
}
@@ -60,27 +189,7 @@ void
xbitmap_init(
struct xbitmap *bitmap)
{
- INIT_LIST_HEAD(&bitmap->list);
-}
-
-/* Compare two btree extents. */
-static int
-xbitmap_range_cmp(
- void *priv,
- const struct list_head *a,
- const struct list_head *b)
-{
- struct xbitmap_range *ap;
- struct xbitmap_range *bp;
-
- ap = container_of(a, struct xbitmap_range, list);
- bp = container_of(b, struct xbitmap_range, list);
-
- if (ap->start > bp->start)
- return 1;
- if (ap->start < bp->start)
- return -1;
- return 0;
+ bitmap->xb_root = RB_ROOT_CACHED;
}
/*
@@ -97,118 +206,26 @@ xbitmap_range_cmp(
*
* This is the logical equivalent of bitmap &= ~sub.
*/
-#define LEFT_ALIGNED (1 << 0)
-#define RIGHT_ALIGNED (1 << 1)
int
xbitmap_disunion(
struct xbitmap *bitmap,
struct xbitmap *sub)
{
- struct list_head *lp;
- struct xbitmap_range *br;
- struct xbitmap_range *new_br;
- struct xbitmap_range *sub_br;
- uint64_t sub_start;
- uint64_t sub_len;
- int state;
- int error = 0;
+ struct xbitmap_node *bn;
+ int error;
- if (list_empty(&bitmap->list) || list_empty(&sub->list))
+ if (xbitmap_empty(bitmap) || xbitmap_empty(sub))
return 0;
- ASSERT(!list_empty(&sub->list));
- list_sort(NULL, &bitmap->list, xbitmap_range_cmp);
- list_sort(NULL, &sub->list, xbitmap_range_cmp);
-
- /*
- * Now that we've sorted both lists, we iterate bitmap once, rolling
- * forward through sub and/or bitmap as necessary until we find an
- * overlap or reach the end of either list. We do not reset lp to the
- * head of bitmap nor do we reset sub_br to the head of sub. The
- * list traversal is similar to merge sort, but we're deleting
- * instead. In this manner we avoid O(n^2) operations.
- */
- sub_br = list_first_entry(&sub->list, struct xbitmap_range,
- list);
- lp = bitmap->list.next;
- while (lp != &bitmap->list) {
- br = list_entry(lp, struct xbitmap_range, list);
-
- /*
- * Advance sub_br and/or br until we find a pair that
- * intersect or we run out of extents.
- */
- while (sub_br->start + sub_br->len <= br->start) {
- if (list_is_last(&sub_br->list, &sub->list))
- goto out;
- sub_br = list_next_entry(sub_br, list);
- }
- if (sub_br->start >= br->start + br->len) {
- lp = lp->next;
- continue;
- }
-
- /* trim sub_br to fit the extent we have */
- sub_start = sub_br->start;
- sub_len = sub_br->len;
- if (sub_br->start < br->start) {
- sub_len -= br->start - sub_br->start;
- sub_start = br->start;
- }
- if (sub_len > br->len)
- sub_len = br->len;
-
- state = 0;
- if (sub_start == br->start)
- state |= LEFT_ALIGNED;
- if (sub_start + sub_len == br->start + br->len)
- state |= RIGHT_ALIGNED;
- switch (state) {
- case LEFT_ALIGNED:
- /* Coincides with only the left. */
- br->start += sub_len;
- br->len -= sub_len;
- break;
- case RIGHT_ALIGNED:
- /* Coincides with only the right. */
- br->len -= sub_len;
- lp = lp->next;
- break;
- case LEFT_ALIGNED | RIGHT_ALIGNED:
- /* Total overlap, just delete ex. */
- lp = lp->next;
- list_del(&br->list);
- kfree(br);
- break;
- case 0:
- /*
- * Deleting from the middle: add the new right extent
- * and then shrink the left extent.
- */
- new_br = kmalloc(sizeof(struct xbitmap_range),
- XCHK_GFP_FLAGS);
- if (!new_br) {
- error = -ENOMEM;
- goto out;
- }
- INIT_LIST_HEAD(&new_br->list);
- new_br->start = sub_start + sub_len;
- new_br->len = br->start + br->len - new_br->start;
- list_add(&new_br->list, &br->list);
- br->len = sub_start - br->start;
- lp = lp->next;
- break;
- default:
- ASSERT(0);
- break;
- }
+ for_each_xbitmap_extent(bn, sub) {
+ error = xbitmap_clear(bitmap, bn->bn_start,
+ bn->bn_last - bn->bn_start + 1);
+ if (error)
+ return error;
}
-out:
- return error;
+ return 0;
}
-#undef LEFT_ALIGNED
-#undef RIGHT_ALIGNED
/*
* Record all btree blocks seen while iterating all records of a btree.
@@ -307,11 +324,11 @@ uint64_t
xbitmap_hweight(
struct xbitmap *bitmap)
{
- struct xbitmap_range *bmr;
+ struct xbitmap_node *bn;
uint64_t ret = 0;
- for_each_xbitmap_extent(bmr, bitmap)
- ret += bmr->len;
+ for_each_xbitmap_extent(bn, bitmap)
+ ret += bn->bn_last - bn->bn_start + 1;
return ret;
}
@@ -320,14 +337,14 @@ xbitmap_hweight(
int
xbitmap_walk(
struct xbitmap *bitmap,
- xbitmap_walk_fn fn,
+ xbitmap_walk_fn fn,
void *priv)
{
- struct xbitmap_range *bex;
+ struct xbitmap_node *bn;
int error = 0;
- for_each_xbitmap_extent(bex, bitmap) {
- error = fn(bex->start, bex->len, priv);
+ for_each_xbitmap_extent(bn, bitmap) {
+ error = fn(bn->bn_start, bn->bn_last - bn->bn_start + 1, priv);
if (error)
break;
}
@@ -371,3 +388,11 @@ xbitmap_walk_bits(
return xbitmap_walk(bitmap, xbitmap_walk_bits_in_run, &wb);
}
+
+/* Does this bitmap have no bits set at all? */
+bool
+xbitmap_empty(
+ struct xbitmap *bitmap)
+{
+ return bitmap->xb_root.rb_root.rb_node == NULL;
+}
diff --git a/fs/xfs/scrub/bitmap.h b/fs/xfs/scrub/bitmap.h
index 53601d281ffb..7afd64a318d1 100644
--- a/fs/xfs/scrub/bitmap.h
+++ b/fs/xfs/scrub/bitmap.h
@@ -6,19 +6,14 @@
#ifndef __XFS_SCRUB_BITMAP_H__
#define __XFS_SCRUB_BITMAP_H__
-struct xbitmap_range {
- struct list_head list;
- uint64_t start;
- uint64_t len;
-};
-
struct xbitmap {
- struct list_head list;
+ struct rb_root_cached xb_root;
};
void xbitmap_init(struct xbitmap *bitmap);
void xbitmap_destroy(struct xbitmap *bitmap);
+int xbitmap_clear(struct xbitmap *bitmap, uint64_t start, uint64_t len);
int xbitmap_set(struct xbitmap *bitmap, uint64_t start, uint64_t len);
int xbitmap_disunion(struct xbitmap *bitmap, struct xbitmap *sub);
int xbitmap_set_btcur_path(struct xbitmap *bitmap,
@@ -42,4 +37,6 @@ typedef int (*xbitmap_walk_bits_fn)(uint64_t bit, void *priv);
int xbitmap_walk_bits(struct xbitmap *bitmap, xbitmap_walk_bits_fn fn,
void *priv);
+bool xbitmap_empty(struct xbitmap *bitmap);
+
#endif /* __XFS_SCRUB_BITMAP_H__ */
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