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ZAP: Massively switch to _by_dnode() interfaces

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Before this change ZAP called dnode_hold() for almost every block
access, that was clearly visible in profiler under heavy load, such
as BRT.  This patch makes it always hold the dnode reference between
zap_lockdir() and zap_unlockdir().  It allows to avoid most of dnode
operations between those.  It also adds several new _by_dnode() APIs
to ZAP and uses them in BRT code.  Also adds dmu_prefetch_by_dnode()
variant and uses it in the ZAP code.

After this there remains only one call to dmu_buf_dnode_enter(),
which seems to be unneeded.  So remove the call and the functions.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15951
This commit is contained in:
Alexander Motin
2024-03-25 17:58:50 -04:00
committed by GitHub
parent bf8f72359d
commit 80cc516295
9 changed files with 202 additions and 172 deletions
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module/zfs/dmu_recv.c
+1 -6
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@@ -2353,7 +2353,6 @@ receive_process_write_record(struct receive_writer_arg *rwa,
if (rwa->heal) {
blkptr_t *bp;
dmu_buf_t *dbp;
dnode_t *dn;
int flags = DB_RF_CANFAIL;
if (rwa->raw)
@@ -2385,19 +2384,15 @@ receive_process_write_record(struct receive_writer_arg *rwa,
dmu_buf_rele(dbp, FTAG);
return (err);
}
dn = dmu_buf_dnode_enter(dbp);
/* Make sure the on-disk block and recv record sizes match */
if (drrw->drr_logical_size !=
dn->dn_datablkszsec << SPA_MINBLOCKSHIFT) {
if (drrw->drr_logical_size != dbp->db_size) {
err = ENOTSUP;
dmu_buf_dnode_exit(dbp);
dmu_buf_rele(dbp, FTAG);
return (err);
}
/* Get the block pointer for the corrupted block */
bp = dmu_buf_get_blkptr(dbp);
err = do_corrective_recv(rwa, drrw, rrd, bp);
dmu_buf_dnode_exit(dbp);
dmu_buf_rele(dbp, FTAG);
return (err);
}