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pstore: add pstore unregister

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pstore doesn't support unregistering yet. It was marked as TODO.
This patch adds some code to fix it:
 1) Add functions to unregister kmsg/console/ftrace/pmsg.
 2) Add a function to free compression buffer.
 3) Unmap the memory and free it.
 4) Add a function to unregister pstore filesystem.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Acked-by: Kees Cook <keescook@chromium.org>
[Removed __exit annotation from ramoops_remove(). Reported by Arnd Bergmann]
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Geliang Tang
2015-10-20 00:39:03 -07:00
committed by Tony Luck
parent 1873041152
commit ee1d267423
10 changed files with 88 additions and 34 deletions
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25
fs/pstore/ftrace.c
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@@ -104,22 +104,23 @@ static const struct file_operations pstore_knob_fops = {
.write = pstore_ftrace_knob_write,
};
static struct dentry *pstore_ftrace_dir;
void pstore_register_ftrace(void)
{
struct dentry *dir;
struct dentry *file;
if (!psinfo->write_buf)
return;
dir = debugfs_create_dir("pstore", NULL);
if (!dir) {
pstore_ftrace_dir = debugfs_create_dir("pstore", NULL);
if (!pstore_ftrace_dir) {
pr_err("%s: unable to create pstore directory\n", __func__);
return;
}
file = debugfs_create_file("record_ftrace", 0600, dir, NULL,
&pstore_knob_fops);
file = debugfs_create_file("record_ftrace", 0600, pstore_ftrace_dir,
NULL, &pstore_knob_fops);
if (!file) {
pr_err("%s: unable to create record_ftrace file\n", __func__);
goto err_file;
@@ -127,5 +128,17 @@ void pstore_register_ftrace(void)
return;
err_file:
debugfs_remove(dir);
debugfs_remove(pstore_ftrace_dir);
}
void pstore_unregister_ftrace(void)
{
mutex_lock(&pstore_ftrace_lock);
if (pstore_ftrace_enabled) {
unregister_ftrace_function(&pstore_ftrace_ops);
pstore_ftrace_enabled = 0;
}
mutex_unlock(&pstore_ftrace_lock);
debugfs_remove_recursive(pstore_ftrace_dir);
}