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From 78918cf18ead4637c5aea20025c319d845518733 Mon Sep 17 00:00:00 2001
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From: moagrawa <moagrawa@redhat.com>
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Date: Mon, 26 Mar 2018 11:00:22 +0530
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Subject: [PATCH 201/201] posix: After set storage.reserve limit df does not
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 show correct output
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Problem: After set storage.reserve limit df does not show correct
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         output on client
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Solution: Update code in posix_statfs to reflect the disk usage
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          correctly on client
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> BUG: 1533736
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> Change-Id: I2c5feda0303d0f4abe5af22fac903011792b2dc8
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> Reviewed on https://review.gluster.org/#/c/19186/
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> Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
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> (cherry pick from commit c494445c886e16ddc6a960b9074a68fe9621ee09)
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BUG: 1550982
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Change-Id: I5444fad40f2df2fdcf4ab80c2641fc9cc56b18fe
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Signed-off-by: moagrawa <moagrawa@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/133745
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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 xlators/storage/posix/src/posix.c | 13 ++++++++++++-
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 1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
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index 6856e5e..56a2ca9 100644
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--- a/xlators/storage/posix/src/posix.c
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+++ b/xlators/storage/posix/src/posix.c
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@@ -3751,6 +3751,7 @@ posix_statfs (call_frame_t *frame, xlator_t *this,
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         struct posix_private * priv      = NULL;
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         int                    shared_by = 1;
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         int                    percent   = 0;
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+        uint64_t               reserved_blocks = 0;
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         VALIDATE_OR_GOTO (frame, out);
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         VALIDATE_OR_GOTO (this, out);
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@@ -3776,7 +3777,17 @@ posix_statfs (call_frame_t *frame, xlator_t *this,
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         }
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         percent = priv->disk_reserve;
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-        buf.f_bfree = (buf.f_bfree - ((buf.f_blocks * percent) / 100));
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+        reserved_blocks = (buf.f_blocks * percent) / 100;
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+
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+        if (buf.f_bfree > reserved_blocks) {
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+                buf.f_bfree = (buf.f_bfree - reserved_blocks);
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+                if (buf.f_bavail > buf.f_bfree) {
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+                        buf.f_bavail = buf.f_bfree;
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+                }
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+        } else {
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+                buf.f_bfree = 0;
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+                buf.f_bavail = 0;
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+        }
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         shared_by = priv->shared_brick_count;
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         if (shared_by > 1) {
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-- 
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1.8.3.1
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