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From 71ff9b7c6356e521d98ee025554b63dd23db9836 Mon Sep 17 00:00:00 2001
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From: Kotresh HR <khiremat@redhat.com>
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Date: Thu, 13 Jun 2019 22:43:47 +0530
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Subject: [PATCH 217/221] uss: Fix tar issue with ctime and uss enabled
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Problem:
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If ctime and uss enabled, tar still complains with 'file
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changed as we read it'
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Cause:
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To clear nfs cache (gluster-nfs), the ctime was incremented
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in snap-view client on stat cbk.
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Fix:
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The ctime should not be incremented manually. Since gluster-nfs
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is planning to be deprecated, this code is being removed to
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fix the issue.
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Backport of:
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> Patch: https://review.gluster.org/22861
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> Change-Id: Iae7f100c20fce880a50b008ba716077350281404
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> fixes: bz#1720290
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> Signed-off-by: Kotresh HR <khiremat@redhat.com>
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Change-Id: Iae7f100c20fce880a50b008ba716077350281404
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BUG: 1709301
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Signed-off-by: Kotresh HR <khiremat@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/173922
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
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---
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.../features/snapview-client/src/snapview-client.c | 22 +++++++++++++---------
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1 file changed, 13 insertions(+), 9 deletions(-)
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diff --git a/xlators/features/snapview-client/src/snapview-client.c b/xlators/features/snapview-client/src/snapview-client.c
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index 5d7986c..9c789ae 100644
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--- a/xlators/features/snapview-client/src/snapview-client.c
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+++ b/xlators/features/snapview-client/src/snapview-client.c
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@@ -577,20 +577,24 @@ gf_svc_stat_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
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int32_t op_ret, int32_t op_errno, struct iatt *buf,
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dict_t *xdata)
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{
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- /* Consider a testcase:
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+ /* TODO: FIX ME
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+ * Consider a testcase:
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* #mount -t nfs host1:/vol1 /mnt
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* #ls /mnt
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* #ls /mnt/.snaps (As expected this fails)
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* #gluster volume set vol1 features.uss enable
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- * Now `ls /mnt/.snaps` should work,
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- * but fails with No such file or directory.
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- * This is because NFS client caches the list of files in
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- * a directory. This cache is updated if there are any changes
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- * in the directory attributes. To solve this problem change
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- * a attribute 'ctime' when USS is enabled
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+ * Now `ls /mnt/.snaps` should work, but fails with No such file or
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+ * directory. This is because NFS client (gNFS) caches the list of files
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+ * in a directory. This cache is updated if there are any changes in the
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+ * directory attributes. So, one way to solve this problem is to change
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+ * 'ctime' attribute when USS is enabled as below.
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+ *
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+ * if (op_ret == 0 && IA_ISDIR(buf->ia_type))
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+ * buf->ia_ctime_nsec++;
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+ *
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+ * But this is not the ideal solution as applications see the unexpected
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+ * ctime change causing failures.
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*/
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- if (op_ret == 0 && IA_ISDIR(buf->ia_type))
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- buf->ia_ctime_nsec++;
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SVC_STACK_UNWIND(stat, frame, op_ret, op_errno, buf, xdata);
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return 0;
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--
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1.8.3.1
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