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fs/resctrl: Inform user space when status buffer overflowed

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resctrl fs commands are becoming more powerful with, for example, a user able
to use syntax like '*' to make broad configuration changes. Such commands that
span multiple domains may result in more than one message printed to the
last_cmd_status buffer with more planned.

Issue "[truncated]" when displaying the last_cmd_status buffer to communicate
if it overflowed. Upon encountering this, user space is expected to combine
details about the failure found in info/last_cmd_status with related resctrl
files to learn the accurate system state after the command failure.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://patch.msgid.link/eb3d1aaa41d1f2bf6b1bb26ceafd52f04912121d.1782857711.git.reinette.chatre@intel.com
This commit is contained in:
Reinette Chatre 2026-06-30 21:27:10 -07:00 committed by Borislav Petkov (AMD)
parent bb38d45719
commit 854db793d4
1 changed files with 5 additions and 2 deletions
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7
fs/resctrl/rdtgroup.c
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@ -979,10 +979,13 @@ static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
if (!info_kn_lock(of->kn))
return -ENOENT;
len = seq_buf_used(&last_cmd_status);
if (len)
if (len) {
seq_printf(seq, "%.*s", len, last_cmd_status_buf);
else
if (seq_buf_has_overflowed(&last_cmd_status))
seq_puts(seq, "[truncated]\n");
} else {
seq_puts(seq, "ok\n");
}
info_kn_unlock(of->kn);
return 0;
}