[PATCH 14/43] xfs: wire up realtime refcount btree cursors

Darrick J. Wong
2024-12-13T01:13:54Z

From: Darrick J. Wong <djwong@kernel.org>

Wire up realtime refcount btree cursors wherever they're needed
throughout the code base.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
fs/xfs/libxfs/xfs_btree.h | 2 -
fs/xfs/libxfs/xfs_refcount.c | 100 +++++++++++++++++++++++++++++++++++++++++-
fs/xfs/libxfs/xfs_rtgroup.c | 9 ++++
fs/xfs/libxfs/xfs_rtgroup.h | 5 ++
fs/xfs/xfs_fsmap.c | 25 +++++------
fs/xfs/xfs_reflink.c | 66 ++++++++++++++++++++++++++--
6 files changed, 187 insertions(+), 20 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index dbc047b2fb2cf5..355b304696e6c3 100644
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -297,7 +297,7 @@ struct xfs_btree_cur
struct {
unsigned int nr_ops; /* # record updates */
unsigned int shape_changes; /* # of extent splits */
- } bc_refc; /* refcountbt */
+ } bc_refc; /* refcountbt/rtrefcountbt */
};

/* Must be at the end of the struct! */
diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
index 8007d15856252b..11bff098db2dbb 100644
--- a/fs/xfs/libxfs/xfs_refcount.c
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -27,6 +27,7 @@
#include "xfs_refcount_item.h"
#include "xfs_rtgroup.h"
#include "xfs_rtalloc.h"
+#include "xfs_rtrefcount_btree.h"

struct kmem_cache *xfs_refcount_intent_cache;

@@ -1462,6 +1463,32 @@ xfs_refcount_finish_one(
return error;
}

+/*
+ * Set up a continuation a deferred rtrefcount operation by updating the
+ * intent. Checks to make sure we're not going to run off the end of the
+ * rtgroup.
+ */
+static inline int
+xfs_rtrefcount_continue_op(
+ struct xfs_btree_cur *cur,
+ struct xfs_refcount_intent *ri,
+ xfs_agblock_t new_agbno)
+{
+ struct xfs_mount *mp = cur->bc_mp;
+ struct xfs_rtgroup *rtg = to_rtg(ri->ri_group);
+
+ if (XFS_IS_CORRUPT(mp, !xfs_verify_rgbext(rtg, new_agbno,
+ ri->ri_blockcount))) {
+ xfs_btree_mark_sick(cur);
+ return -EFSCORRUPTED;
+ }
+
+ ri->ri_startblock = xfs_rgbno_to_rtb(rtg, new_agbno);
+
+ ASSERT(xfs_verify_rtbext(mp, ri->ri_startblock, ri->ri_blockcount));
+ return 0;
+}
+
/*
* Process one of the deferred realtime refcount operations. We pass back the
* btree cursor to maintain our lock on the btree between calls.
@@ -1472,8 +1499,77 @@ xfs_rtrefcount_finish_one(
struct xfs_refcount_intent *ri,
struct xfs_btree_cur **pcur)
{
- ASSERT(0);
- return -EFSCORRUPTED;
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_rtgroup *rtg = to_rtg(ri->ri_group);
+ struct xfs_btree_cur *rcur = *pcur;
+ int error = 0;
+ xfs_rgblock_t bno;
+ unsigned long nr_ops = 0;
+ int shape_changes = 0;
+
+ bno = xfs_rtb_to_rgbno(mp, ri->ri_startblock);
+
+ trace_xfs_refcount_deferred(mp, ri);
+
+ if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_REFCOUNT_FINISH_ONE))
+ return -EIO;
+
+ /*
+ * If we haven't gotten a cursor or the cursor AG doesn't match
+ * the startblock, get one now.
+ */
+ if (rcur != NULL && rcur->bc_group != ri->ri_group) {
+ nr_ops = rcur->bc_refc.nr_ops;
+ shape_changes = rcur->bc_refc.shape_changes;
+ xfs_btree_del_cursor(rcur, 0);
+ rcur = NULL;
+ *pcur = NULL;
+ }
+ if (rcur == NULL) {
+ xfs_rtgroup_lock(rtg, XFS_RTGLOCK_REFCOUNT);
+ xfs_rtgroup_trans_join(tp, rtg, XFS_RTGLOCK_REFCOUNT);
+ *pcur = rcur = xfs_rtrefcountbt_init_cursor(tp, rtg);
+
+ rcur->bc_refc.nr_ops = nr_ops;
+ rcur->bc_refc.shape_changes = shape_changes;
+ }
+
+ switch (ri->ri_type) {
+ case XFS_REFCOUNT_INCREASE:
+ error = xfs_refcount_adjust(rcur, &bno, &ri->ri_blockcount,
+ XFS_REFCOUNT_ADJUST_INCREASE);
+ if (error)
+ return error;
+ if (ri->ri_blockcount > 0)
+ error = xfs_rtrefcount_continue_op(rcur, ri, bno);
+ break;
+ case XFS_REFCOUNT_DECREASE:
+ error = xfs_refcount_adjust(rcur, &bno, &ri->ri_blockcount,
+ XFS_REFCOUNT_ADJUST_DECREASE);
+ if (error)
+ return error;
+ if (ri->ri_blockcount > 0)
+ error = xfs_rtrefcount_continue_op(rcur, ri, bno);
+ break;
+ case XFS_REFCOUNT_ALLOC_COW:
+ error = __xfs_refcount_cow_alloc(rcur, bno, ri->ri_blockcount);
+ if (error)
+ return error;
+ ri->ri_blockcount = 0;
+ break;
+ case XFS_REFCOUNT_FREE_COW:
+ error = __xfs_refcount_cow_free(rcur, bno, ri->ri_blockcount);
+ if (error)
+ return error;
+ ri->ri_blockcount = 0;
+ break;
+ default:
+ ASSERT(0);
+ return -EFSCORRUPTED;
+ }
+ if (!error && ri->ri_blockcount > 0)
+ trace_xfs_refcount_finish_one_leftover(mp, ri);
+ return error;
}

/*
diff --git a/fs/xfs/libxfs/xfs_rtgroup.c b/fs/xfs/libxfs/xfs_rtgroup.c
index 6aebe9f484901f..d5ecc2f6c5c202 100644
--- a/fs/xfs/libxfs/xfs_rtgroup.c
+++ b/fs/xfs/libxfs/xfs_rtgroup.c
@@ -206,6 +206,9 @@ xfs_rtgroup_lock(

if ((rtglock_flags & XFS_RTGLOCK_RMAP) && rtg_rmap(rtg))
xfs_ilock(rtg_rmap(rtg), XFS_ILOCK_EXCL);
+
+ if ((rtglock_flags & XFS_RTGLOCK_REFCOUNT) && rtg_refcount(rtg))
+ xfs_ilock(rtg_refcount(rtg), XFS_ILOCK_EXCL);
}

/* Unlock metadata inodes associated with this rt group. */
@@ -218,6 +221,9 @@ xfs_rtgroup_unlock(
ASSERT(!(rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED) ||
!(rtglock_flags & XFS_RTGLOCK_BITMAP));

+ if ((rtglock_flags & XFS_RTGLOCK_REFCOUNT) && rtg_refcount(rtg))
+ xfs_iunlock(rtg_refcount(rtg), XFS_ILOCK_EXCL);
+
if ((rtglock_flags & XFS_RTGLOCK_RMAP) && rtg_rmap(rtg))
xfs_iunlock(rtg_rmap(rtg), XFS_ILOCK_EXCL);

@@ -249,6 +255,9 @@ xfs_rtgroup_trans_join(

if ((rtglock_flags & XFS_RTGLOCK_RMAP) && rtg_rmap(rtg))
xfs_trans_ijoin(tp, rtg_rmap(rtg), XFS_ILOCK_EXCL);
+
+ if ((rtglock_flags & XFS_RTGLOCK_REFCOUNT) && rtg_refcount(rtg))
+ xfs_trans_ijoin(tp, rtg_refcount(rtg), XFS_ILOCK_EXCL);
}

/* Retrieve rt group geometry. */
diff --git a/fs/xfs/libxfs/xfs_rtgroup.h b/fs/xfs/libxfs/xfs_rtgroup.h
index 385ea8e2f28b67..de4eeb381fc9fc 100644
--- a/fs/xfs/libxfs/xfs_rtgroup.h
+++ b/fs/xfs/libxfs/xfs_rtgroup.h
@@ -273,10 +273,13 @@ int xfs_update_last_rtgroup_size(struct xfs_mount *mp,
#define XFS_RTGLOCK_BITMAP_SHARED (1U << 1)
/* Lock the rt rmap inode in exclusive mode */
#define XFS_RTGLOCK_RMAP (1U << 2)
+/* Lock the rt refcount inode in exclusive mode */
+#define XFS_RTGLOCK_REFCOUNT (1U << 3)

#define XFS_RTGLOCK_ALL_FLAGS (XFS_RTGLOCK_BITMAP | \
XFS_RTGLOCK_BITMAP_SHARED | \
- XFS_RTGLOCK_RMAP)
+ XFS_RTGLOCK_RMAP | \
+ XFS_RTGLOCK_REFCOUNT)

void xfs_rtgroup_lock(struct xfs_rtgroup *rtg, unsigned int rtglock_flags);
void xfs_rtgroup_unlock(struct xfs_rtgroup *rtg, unsigned int rtglock_flags);
diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c
index 3e3ef16f65a335..1dbd2d75f7ae3e 100644
--- a/fs/xfs/xfs_fsmap.c
+++ b/fs/xfs/xfs_fsmap.c
@@ -27,6 +27,7 @@
#include "xfs_ag.h"
#include "xfs_rtgroup.h"
#include "xfs_rtrmap_btree.h"
+#include "xfs_rtrefcount_btree.h"

/* Convert an xfs_fsmap to an fsmap. */
static void
@@ -212,21 +213,20 @@ xfs_getfsmap_is_shared(
struct xfs_mount *mp = tp->t_mountp;
struct xfs_btree_cur *cur;
xfs_agblock_t fbno;
- xfs_extlen_t flen;
+ xfs_extlen_t flen = 0;
int error;

*stat = false;
- if (!xfs_has_reflink(mp))
- return 0;
- /* rt files will have no perag structure */
- if (!info->group)
+ if (!xfs_has_reflink(mp) || !info->group)
return 0;

+ if (info->group->xg_type == XG_TYPE_RTG)
+ cur = xfs_rtrefcountbt_init_cursor(tp, to_rtg(info->group));
+ else
+ cur = xfs_refcountbt_init_cursor(mp, tp, info->agf_bp,
+ to_perag(info->group));
+
/* Are there any shared blocks here? */
- flen = 0;
- cur = xfs_refcountbt_init_cursor(mp, tp, info->agf_bp,
- to_perag(info->group));
-
error = xfs_refcount_find_shared(cur, frec->rec_key,
XFS_BB_TO_FSBT(mp, frec->len_daddr), &fbno, &flen,
false);
@@ -863,7 +863,7 @@ xfs_getfsmap_rtdev_rmapbt_query(
struct xfs_rtgroup *rtg = to_rtg(info->group);

/* Query the rtrmapbt */
- xfs_rtgroup_lock(rtg, XFS_RTGLOCK_RMAP);
+ xfs_rtgroup_lock(rtg, XFS_RTGLOCK_RMAP | XFS_RTGLOCK_REFCOUNT);
*curpp = xfs_rtrmapbt_init_cursor(tp, rtg);
return xfs_rmap_query_range(*curpp, &info->low, &info->high,
xfs_getfsmap_rtdev_rmapbt_helper, info);
@@ -950,7 +950,8 @@ xfs_getfsmap_rtdev_rmapbt(

if (bt_cur) {
xfs_rtgroup_unlock(to_rtg(bt_cur->bc_group),
- XFS_RTGLOCK_RMAP);
+ XFS_RTGLOCK_RMAP |
+ XFS_RTGLOCK_REFCOUNT);
xfs_btree_del_cursor(bt_cur, XFS_BTREE_NOERROR);
bt_cur = NULL;
}
@@ -988,7 +989,7 @@ xfs_getfsmap_rtdev_rmapbt(

if (bt_cur) {
xfs_rtgroup_unlock(to_rtg(bt_cur->bc_group),
- XFS_RTGLOCK_RMAP);
+ XFS_RTGLOCK_RMAP | XFS_RTGLOCK_REFCOUNT);
xfs_btree_del_cursor(bt_cur, error < 0 ? XFS_BTREE_ERROR :
XFS_BTREE_NOERROR);
}
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 71b4743ffb7741..66ce29101462cd 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -30,6 +30,9 @@
#include "xfs_ag.h"
#include "xfs_ag_resv.h"
#include "xfs_health.h"
+#include "xfs_rtrefcount_btree.h"
+#include "xfs_rtalloc.h"
+#include "xfs_rtgroup.h"

/*
* Copy on Write of Shared Blocks
@@ -163,6 +166,53 @@ xfs_reflink_find_shared(
return error;
}

+/*
+ * Given a file mapping for the rt device, find the lowest-numbered run of
+ * shared blocks within that mapping and return it in shared_offset/shared_len.
+ * The offset is relative to the start of irec.
+ *
+ * If find_end_of_shared is true, return the longest contiguous extent of shared
+ * blocks. If there are no shared extents, shared_offset and shared_len will be
+ * set to 0;
+ */
+static int
+xfs_reflink_find_rtshared(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ const struct xfs_bmbt_irec *irec,
+ xfs_extlen_t *shared_offset,
+ xfs_extlen_t *shared_len,
+ bool find_end_of_shared)
+{
+ struct xfs_rtgroup *rtg;
+ struct xfs_btree_cur *cur;
+ xfs_rgblock_t orig_bno;
+ xfs_agblock_t found_bno;
+ int error;
+
+ BUILD_BUG_ON(NULLRGBLOCK != NULLAGBLOCK);
+
+ /*
+ * Note: this uses the not quite correct xfs_agblock_t type because
+ * xfs_refcount_find_shared is shared between the RT and data device
+ * refcount code.
+ */
+ orig_bno = xfs_rtb_to_rgbno(mp, irec->br_startblock);
+ rtg = xfs_rtgroup_get(mp, xfs_rtb_to_rgno(mp, irec->br_startblock));
+
+ xfs_rtgroup_lock(rtg, XFS_RTGLOCK_REFCOUNT);
+ cur = xfs_rtrefcountbt_init_cursor(tp, rtg);
+ error = xfs_refcount_find_shared(cur, orig_bno, irec->br_blockcount,
+ &found_bno, shared_len, find_end_of_shared);
+ xfs_btree_del_cursor(cur, error);
+ xfs_rtgroup_unlock(rtg, XFS_RTGLOCK_REFCOUNT);
+ xfs_rtgroup_put(rtg);
+
+ if (!error && *shared_len)
+ *shared_offset = found_bno - orig_bno;
+ return error;
+}
+
/*
* Trim the mapping to the next block where there's a change in the
* shared/unshared status. More specifically, this means that we
@@ -191,8 +241,12 @@ xfs_reflink_trim_around_shared(

trace_xfs_reflink_trim_around_shared(ip, irec);

- error = xfs_reflink_find_shared(mp, NULL, irec, &shared_offset,
- &shared_len, true);
+ if (XFS_IS_REALTIME_INODE(ip))
+ error = xfs_reflink_find_rtshared(mp, NULL, irec,
+ &shared_offset, &shared_len, true);
+ else
+ error = xfs_reflink_find_shared(mp, NULL, irec,
+ &shared_offset, &shared_len, true);
if (error)
return error;

@@ -1554,8 +1608,12 @@ xfs_reflink_inode_has_shared_extents(
got.br_state != XFS_EXT_NORM)
goto next;

- error = xfs_reflink_find_shared(mp, tp, &got, &shared_offset,
- &shared_len, false);
+ if (XFS_IS_REALTIME_INODE(ip))
+ error = xfs_reflink_find_rtshared(mp, tp, &got,
+ &shared_offset, &shared_len, false);
+ else
+ error = xfs_reflink_find_shared(mp, tp, &got,
+ &shared_offset, &shared_len, false);
if (error)
return error;