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From: Adam Borowski <>
Cc: Adam Borowski <>
Subject: [PATCH] btrfs-progs: subv del: hide a bogus warning on an unprivileged delete
Date: Mon, 24 Jan 2022 14:36:32 +0100	[thread overview]
Message-ID: <> (raw)

Checking the default subvolume uses TREE_SEARCH which is a CAP_SYS_ADMIN
only operation, and thus will fail when unprivileged, even if we have
permissions to actually delete the subvolume.

This produces a warning even if all is ok.  Let's hide it if we're not
root (root but !CAP is odd enough to warn).

Fixes 87804a3f0663a4d1891395bd97b8e81e6f183e66
Signed-off-by: Adam Borowski <>
 cmds/subvolume.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmds/subvolume.c b/cmds/subvolume.c
index 6aac7dd1..e767e20d 100644
--- a/cmds/subvolume.c
+++ b/cmds/subvolume.c
@@ -376,7 +376,8 @@ again:
 	err = btrfs_util_get_default_subvolume_fd(fd, &default_subvol_id);
 	if (err) {
-		warning("cannot read default subvolume id: %m");
+		if (!geteuid())
+			warning("cannot read default subvolume id: %m");
 		default_subvol_id = 0;

             reply	other threads:[~2022-01-24 13:38 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-24 13:36 Adam Borowski [this message]
2022-02-01 17:19 ` David Sterba

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