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tools: bpftool: add an option to prevent auto-mount of bpffs, tracefs

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In order to make life easier for users, bpftool automatically attempts
to mount the BPF virtual file system, if it is not mounted already,
before trying to pin objects in it. Similarly, it attempts to mount
tracefs if necessary before trying to dump the trace pipe to the
console.

While mounting file systems on-the-fly can improve user experience, some
administrators might prefer to avoid that. Let's add an option to block
these mount attempts. Note that it does not prevent automatic mounting
of tracefs by debugfs for the "bpftool prog tracelog" command.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Quentin Monnet
2018-12-18 10:13:19 +00:00
committed by Daniel Borkmann
parent be3245e22d
commit 33221307c3
7 changed files with 31 additions and 2 deletions
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6
tools/bpf/bpftool/common.c
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@@ -177,6 +177,12 @@ int mount_bpffs_for_pin(const char *name)
/* nothing to do if already mounted */
goto out_free;
if (block_mount) {
p_err("no BPF file system found, not mounting it due to --nomount option");
err = -1;
goto out_free;
}
err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
if (err) {
err_str[ERR_MAX_LEN - 1] = '\0';