From: Darrick J. Wong <djwong@xxxxxxxxxx>
Connect the getfsmap ioctl to the realtime rmapbt.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
fs/xfs/xfs_fsmap.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 191 insertions(+), 3 deletions(-)
diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c
index 34769cb35c908..b0eabc76eb28a 100644
--- a/fs/xfs/xfs_fsmap.c
+++ b/fs/xfs/xfs_fsmap.c
@@ -25,6 +25,8 @@
#include "xfs_alloc_btree.h"
#include "xfs_rtbitmap.h"
#include "xfs_ag.h"
+#include "xfs_rtgroup.h"
+#include "xfs_rtrmap_btree.h"
/* Convert an xfs_fsmap to an fsmap. */
static void
@@ -158,6 +160,7 @@ struct xfs_getfsmap_info {
struct xfs_fsmap_head *head;
struct fsmap *fsmap_recs; /* mapping records */
struct xfs_buf *agf_bp; /* AGF, for refcount queries */
+ struct xfs_rtgroup *rtg; /* rt group info, if needed */
struct xfs_perag *pag; /* AG info, if applicable */
xfs_daddr_t next_daddr; /* next daddr we expect */
/* daddr of low fsmap key when we're using the rtbitmap */
@@ -338,8 +341,14 @@ xfs_getfsmap_helper(
if (info->head->fmh_entries >= info->head->fmh_count)
return -ECANCELED;
- trace_xfs_fsmap_mapping(mp, info->dev,
- info->pag ? info->pag->pag_agno : NULLAGNUMBER, rec);
+ if (info->pag)
+ trace_xfs_fsmap_mapping(mp, info->dev, info->pag->pag_agno,
+ rec);
+ else if (info->rtg)
+ trace_xfs_fsmap_mapping(mp, info->dev, info->rtg->rtg_rgno,
+ rec);
+ else
+ trace_xfs_fsmap_mapping(mp, info->dev, NULLAGNUMBER, rec);
fmr.fmr_device = info->dev;
fmr.fmr_physical = rec_daddr;
@@ -784,6 +793,181 @@ xfs_getfsmap_rtdev_rtbitmap(
xfs_rtbitmap_unlock_shared(mp, XFS_RBMLOCK_BITMAP);
return error;
}
+
+/* Transform a realtime rmapbt record into a fsmap */
+STATIC int
+xfs_getfsmap_rtdev_rmapbt_helper(
+ struct xfs_btree_cur *cur,
+ const struct xfs_rmap_irec *rec,
+ void *priv)
+{
+ struct xfs_mount *mp = cur->bc_mp;
+ struct xfs_getfsmap_info *info = priv;
+ xfs_rtblock_t rtbno;
+ xfs_daddr_t rec_daddr;
+
+ rtbno = xfs_rgbno_to_rtb(mp, cur->bc_ino.rtg->rtg_rgno,
+ rec->rm_startblock);
+ rec_daddr = xfs_rtb_to_daddr(mp, rtbno);
+
+ return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr, 0);
+}
+
+/* Actually query the rtrmap btree. */
+STATIC int
+xfs_getfsmap_rtdev_rmapbt_query(
+ struct xfs_trans *tp,
+ struct xfs_getfsmap_info *info,
+ struct xfs_btree_cur **curpp)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+
+ /* Report any gap at the end of the last rtgroup. */
+ if (info->last)
+ return xfs_getfsmap_rtdev_rmapbt_helper(*curpp, &info->high,
+ info);
+
+ /* Query the rtrmapbt */
+ xfs_rtgroup_lock(NULL, info->rtg, XFS_RTGLOCK_RMAP);
+ *curpp = xfs_rtrmapbt_init_cursor(mp, tp, info->rtg,
+ info->rtg->rtg_rmapip);
+ return xfs_rmap_query_range(*curpp, &info->low, &info->high,
+ xfs_getfsmap_rtdev_rmapbt_helper, info);
+}
+
+/* Execute a getfsmap query against the realtime device rmapbt. */
+STATIC int
+xfs_getfsmap_rtdev_rmapbt(
+ struct xfs_trans *tp,
+ const struct xfs_fsmap *keys,
+ struct xfs_getfsmap_info *info)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_rtgroup *rtg;
+ struct xfs_btree_cur *bt_cur = NULL;
+ xfs_rtblock_t start_rtb;
+ xfs_rtblock_t end_rtb;
+ xfs_rgnumber_t start_rg, end_rg;
+ uint64_t eofs;
+ int error = 0;
+
+ eofs = XFS_FSB_TO_BB(mp, xfs_rtx_to_rtb(mp, mp->m_sb.sb_rextents));
+ if (keys[0].fmr_physical >= eofs)
+ return 0;
+ start_rtb = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical);
+ end_rtb = XFS_BB_TO_FSB(mp, min(eofs - 1, keys[1].fmr_physical));
+
+ info->missing_owner = XFS_FMR_OWN_FREE;
+
+ /*
+ * Convert the fsmap low/high keys to rtgroup based keys. Initialize
+ * low to the fsmap low key and max out the high key to the end
+ * of the rtgroup.
+ */
+ info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset);
+ error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]);
+ if (error)
+ return error;
+ info->low.rm_blockcount = XFS_BB_TO_FSBT(mp, keys[0].fmr_length);
+ xfs_getfsmap_set_irec_flags(&info->low, &keys[0]);
+
+ /* Adjust the low key if we are continuing from where we left off. */
+ if (info->low.rm_blockcount == 0) {
+ /* No previous record from which to continue */
+ } else if (rmap_not_shareable(mp, &info->low)) {
+ /* Last record seen was an unshareable extent */
+ info->low.rm_owner = 0;
+ info->low.rm_offset = 0;
+
+ start_rtb += info->low.rm_blockcount;
+ if (xfs_rtb_to_daddr(mp, start_rtb) >= eofs)
+ return 0;
+ } else {
+ /* Last record seen was a shareable file data extent */
+ info->low.rm_offset += info->low.rm_blockcount;
+ }
+ info->low.rm_startblock = xfs_rtb_to_rgbno(mp, start_rtb, &start_rg);
+
+ info->high.rm_startblock = -1U;
+ info->high.rm_owner = ULLONG_MAX;
+ info->high.rm_offset = ULLONG_MAX;
+ info->high.rm_blockcount = 0;
+ info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS;
+
+ end_rg = xfs_rtb_to_rgno(mp, end_rtb);
+
+ for_each_rtgroup_range(mp, start_rg, end_rg, rtg) {
+ /*
+ * Set the rtgroup high key from the fsmap high key if this
+ * is the last rtgroup that we're querying.
+ */
+ info->rtg = rtg;
+ if (rtg->rtg_rgno == end_rg) {
+ xfs_rgnumber_t junk;
+
+ info->high.rm_startblock = xfs_rtb_to_rgbno(mp,
+ end_rtb, &junk);
+ info->high.rm_offset = XFS_BB_TO_FSBT(mp,
+ keys[1].fmr_offset);
+ error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]);
+ if (error)
+ break;
+ xfs_getfsmap_set_irec_flags(&info->high, &keys[1]);
+ }
+
+ if (bt_cur) {
+ xfs_rtgroup_unlock(bt_cur->bc_ino.rtg,
+ XFS_RTGLOCK_RMAP);
+ xfs_btree_del_cursor(bt_cur, XFS_BTREE_NOERROR);
+ bt_cur = NULL;
+ }
+
+ trace_xfs_fsmap_low_key(mp, info->dev, rtg->rtg_rgno,
+ &info->low);
+ trace_xfs_fsmap_high_key(mp, info->dev, rtg->rtg_rgno,
+ &info->high);
+
+ error = xfs_getfsmap_rtdev_rmapbt_query(tp, info, &bt_cur);
+ if (error)
+ break;
+
+ /*
+ * Set the rtgroup low key to the start of the rtgroup prior to
+ * moving on to the next rtgroup.
+ */
+ if (rtg->rtg_rgno == start_rg)
+ memset(&info->low, 0, sizeof(info->low));
+
+ /*
+ * If this is the last rtgroup, report any gap at the end of it
+ * before we drop the reference to the perag when the loop
+ * terminates.
+ */
+ if (rtg->rtg_rgno == end_rg) {
+ info->last = true;
+ error = xfs_getfsmap_rtdev_rmapbt_query(tp, info,
+ &bt_cur);
+ if (error)
+ break;
+ }
+ info->rtg = NULL;
+ }
+
+ if (bt_cur) {
+ xfs_rtgroup_unlock(bt_cur->bc_ino.rtg, XFS_RTGLOCK_RMAP);
+ xfs_btree_del_cursor(bt_cur, error < 0 ? XFS_BTREE_ERROR :
+ XFS_BTREE_NOERROR);
+ }
+ if (info->rtg) {
+ xfs_rtgroup_rele(info->rtg);
+ info->rtg = NULL;
+ } else if (rtg) {
+ /* loop termination case */
+ xfs_rtgroup_rele(rtg);
+ }
+
+ return error;
+}
#endif /* CONFIG_XFS_RT */
/* Do we recognize the device? */
@@ -916,7 +1100,10 @@ xfs_getfsmap(
#ifdef CONFIG_XFS_RT
if (mp->m_rtdev_targp) {
handlers[2].dev = new_encode_dev(mp->m_rtdev_targp->bt_dev);
- handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap;
+ if (use_rmap)
+ handlers[2].fn = xfs_getfsmap_rtdev_rmapbt;
+ else
+ handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap;
}
#endif /* CONFIG_XFS_RT */
@@ -983,6 +1170,7 @@ xfs_getfsmap(
info.dev = handlers[i].dev;
info.last = false;
info.pag = NULL;
+ info.rtg = NULL;
info.low_daddr = -1ULL;
info.low.rm_blockcount = 0;
error = handlers[i].fn(tp, dkeys, &info);
