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From: James Simmons <jsimmons@infradead.org>
To: Andreas Dilger <adilger@whamcloud.com>,
	Oleg Drokin <green@whamcloud.com>, NeilBrown <neilb@suse.de>
Cc: Mikhail Pershin <mpershin@whamcloud.com>,
	Lustre Development List <lustre-devel@lists.lustre.org>
Subject: [lustre-devel] [PATCH 26/39] lustre: lov: fix SEEK_HOLE calcs at component end
Date: Thu, 21 Jan 2021 12:16:49 -0500
Message-ID: <1611249422-556-27-git-send-email-jsimmons@infradead.org> (raw)
In-Reply-To: <1611249422-556-1-git-send-email-jsimmons@infradead.org>

From: Mikhail Pershin <mpershin@whamcloud.com>

If data ends exactly at component end then LOV assumed that
is not yet hole in file and the next component will take care.
Meanwhile there can be no next component initialized yet if file
ends exactly at component boundary, so no hole offset is returned
but error

Patch fixes that issue. If component reports hole offset at
component end then it is saved to be used as result when no
other components report valid hole offset.

WC-bug-id: https://jira.whamcloud.com/browse/LU-14143
Lustre-commit: dbb6b493ad9f98 ("LU-14143 lov: fix SEEK_HOLE calcs at component end")
Signed-off-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/40713
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
---
 fs/lustre/lov/lov_io.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/fs/lustre/lov/lov_io.c b/fs/lustre/lov/lov_io.c
index 7f0e945..ac88a55 100644
--- a/fs/lustre/lov/lov_io.c
+++ b/fs/lustre/lov/lov_io.c
@@ -1295,6 +1295,7 @@ static void lov_io_lseek_end(const struct lu_env *env,
 	struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
 	struct lov_io_sub *sub;
 	loff_t offset = -ENXIO;
+	u64 hole_off = 0;
 	bool seek_hole = io->u.ci_lseek.ls_whence == SEEK_HOLE;
 
 	list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
@@ -1302,6 +1303,7 @@ static void lov_io_lseek_end(const struct lu_env *env,
 		int index = lov_comp_entry(sub->sub_subio_index);
 		int stripe = lov_comp_stripe(sub->sub_subio_index);
 		loff_t sub_off, lov_off;
+		u64 comp_end = lsm->lsm_entries[index]->lsme_extent.e_end;
 
 		lov_io_end_wrapper(sub->sub_env, subio);
 
@@ -1347,10 +1349,22 @@ static void lov_io_lseek_end(const struct lu_env *env,
 		/* resulting offset can be out of component range if stripe
 		 * object is full and its file size was returned as virtual
 		 * hole start. Skip this result, the next component will give
-		 * us correct lseek result.
+		 * us correct lseek result but keep possible hole offset in
+		 * case there is no more components ahead
 		 */
-		if (lov_off >= lsm->lsm_entries[index]->lsme_extent.e_end)
+		if (lov_off >= comp_end) {
+			/* must be SEEK_HOLE case */
+			if (likely(seek_hole)) {
+				/* save comp end as potential hole offset */
+				hole_off = max_t(u64, comp_end, hole_off);
+			} else {
+				io->ci_result = -EINVAL;
+				CDEBUG(D_INFO,
+				       "off %lld >= comp_end %llu: rc = %d\n",
+				       lov_off, comp_end, io->ci_result);
+			}
 			continue;
+		}
 
 		CDEBUG(D_INFO, "SEEK_%s: %lld->%lld/%lld: rc = %d\n",
 		       seek_hole ? "HOLE" : "DATA",
@@ -1358,6 +1372,10 @@ static void lov_io_lseek_end(const struct lu_env *env,
 		       sub->sub_io.ci_result);
 		offset = min_t(u64, offset, lov_off);
 	}
+	/* no result but some component returns hole as component end */
+	if (seek_hole && offset == -ENXIO && hole_off > 0)
+		offset = hole_off;
+
 	io->u.ci_lseek.ls_result = offset;
 }
 
-- 
1.8.3.1

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  parent reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 17:16 [lustre-devel] [PATCH 00/39] lustre: update to latest OpenSFS version as of Jan 21 2021 James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 01/39] lustre: ldlm: page discard speedup James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 02/39] lustre: ptlrpc: fixes for RCU-related stalls James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 03/39] lustre: ldlm: Do not wait for lock replay sending if import dsconnected James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 04/39] lustre: ldlm: Do not hang if recovery restarted during lock replay James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 05/39] lnet: Correct handling of NETWORK_TIMEOUT status James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 06/39] lnet: Introduce constant for net ID of LNET_NID_ANY James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 07/39] lustre: ldlm: Don't re-enqueue glimpse lock on read James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 08/39] lustre: osc: prevent overflow of o_dropped James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 09/39] lustre: llite: fix client evicition with DIO James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 10/39] lustre: Use vfree_atomic instead of vfree James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 11/39] lnet: lnd: Use NETWORK_TIMEOUT for txs on ibp_tx_queue James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 12/39] lnet: lnd: Use NETWORK_TIMEOUT for some conn failures James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 13/39] lustre: llite: allow DIO with unaligned IO count James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 14/39] lustre: osc: skip 0 row for rpc_stats James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 15/39] lustre: quota: df should return projid-specific values James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 16/39] lnet: discard the callback James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 17/39] lustre: llite: try to improve mmap performance James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 18/39] lnet: Introduce lnet_recovery_limit parameter James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 19/39] lustre: mdc: avoid easize set to 0 James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 20/39] lustre: lmv: optimize dir shard revalidate James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 21/39] lustre: ldlm: osc_object_ast_clear() is called for mdc object on eviction James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 22/39] lustre: uapi: fix compatibility for LL_IOC_MDC_GETINFO James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 23/39] lustre: llite: don't check layout info for page discard James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 24/39] lustre: update version to 2.13.57 James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 25/39] lnet: o2iblnd: retry qp creation with reduced queue depth James Simmons
2021-01-21 17:16 ` James Simmons [this message]
2021-01-21 17:16 ` [lustre-devel] [PATCH 27/39] lustre: lov: instantiate components layout for fallocate James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 28/39] lustre: dom: non-blocking enqueue for DOM locks James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 29/39] lustre: llite: fiemap set flags for encrypted files James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 30/39] lustre: ldlm: don't compute sumsq for pool stats James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 31/39] lustre: lov: FIEMAP support for PFL and FLR file James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 32/39] lustre: mdc: process changelogs_catalog from the oldest rec James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 33/39] lustre: ldlm: Use req_mode while lock cleanup James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 34/39] lnet: socklnd: announce deprecation of 'use_tcp_bonding' James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 35/39] lnet: o2iblnd: remove FMR-pool support James Simmons
2021-01-21 17:16 ` [lustre-devel] [PATCH 36/39] lustre: llite: return EOPNOTSUPP if fallocate is not supported James Simmons
2021-01-21 17:17 ` [lustre-devel] [PATCH 37/39] lnet: use an unbound cred in kiblnd_resolve_addr() James Simmons
2021-01-21 17:17 ` [lustre-devel] [PATCH 38/39] lustre: lov: correctly set OST obj size James Simmons
2021-01-21 17:17 ` [lustre-devel] [PATCH 39/39] lustre: cksum: add lprocfs checksum support in MDC/MDT James Simmons

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