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From 0f053de4bc3ca0cfd88a42d236881dfdddb10ee9 Mon Sep 17 00:00:00 2001
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From: Kamil Dudka <kdudka@redhat.com>
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Date: Wed, 30 Jun 2021 17:53:22 +0200
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Subject: [PATCH] df: fix duplicated remote entries due to bind mounts
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As originally reported in <https://bugzilla.redhat.com/1962515>,
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df invoked without -a printed duplicated entries for NFS mounts
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of bind mounts. This is a regression from commit v8.25-54-g1c17f61ef99,
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which introduced the use of a hash table.
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The proposed patch makes sure that the devlist entry seen the last time
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is used for comparison when eliminating duplicated mount entries. This
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way it worked before introducing the hash table.
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Patch co-authored by Roberto Bergantinos.
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* src/ls.c (struct devlist): Introduce the seen_last pointer.
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(devlist_for_dev): Return the devlist entry seen the last time if found.
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(filter_mount_list): Remember the devlist entry seen the last time for
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each hashed item.
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Fixes https://bugs.gnu.org/49298
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Upstream-commit: d6125af095c9553f38cba0696f15158f5abe4ecc
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/df.c | 15 +++++++++++++--
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1 file changed, 13 insertions(+), 2 deletions(-)
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diff --git a/src/df.c b/src/df.c
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index 7e01839..3e9247f 100644
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--- a/src/df.c
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+++ b/src/df.c
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@@ -54,6 +54,7 @@ struct devlist
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dev_t dev_num;
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struct mount_entry *me;
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struct devlist *next;
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+ struct devlist *seen_last; /* valid for hashed devlist entries only */
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};
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/* Filled with device numbers of examined file systems to avoid
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@@ -689,7 +690,13 @@ devlist_for_dev (dev_t dev)
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return NULL;
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struct devlist dev_entry;
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dev_entry.dev_num = dev;
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- return hash_lookup (devlist_table, &dev_entry);
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+
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+ struct devlist *found = hash_lookup (devlist_table, &dev_entry);
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+ if (found == NULL)
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+ return NULL;
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+
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+ /* Return the last devlist entry we have seen with this dev_num */
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+ return found->seen_last;
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}
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static void
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@@ -807,8 +814,12 @@ filter_mount_list (bool devices_only)
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devlist->dev_num = buf.st_dev;
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devlist->next = device_list;
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device_list = devlist;
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- if (hash_insert (devlist_table, devlist) == NULL)
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+
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+ struct devlist *hash_entry = hash_insert (devlist_table, devlist);
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+ if (hash_entry == NULL)
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xalloc_die ();
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+ /* Ensure lookups use this latest devlist. */
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+ hash_entry->seen_last = devlist;
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me = me->me_next;
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}
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--
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2.31.1
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