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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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35
fs/pstore/platform.c
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@@ -237,6 +237,14 @@ static void allocate_buf_for_compression(void)
}
static void free_buf_for_compression(void)
{
kfree(stream.workspace);
stream.workspace = NULL;
kfree(big_oops_buf);
big_oops_buf = NULL;
}
/*
* Called when compression fails, since the printk buffer
* would be fetched for compression calling it again when
@@ -358,6 +366,11 @@ static void pstore_register_kmsg(void)
kmsg_dump_register(&pstore_dumper);
}
static void pstore_unregister_kmsg(void)
{
kmsg_dump_unregister(&pstore_dumper);
}
#ifdef CONFIG_PSTORE_CONSOLE
static void pstore_console_write(struct console *con, const char *s, unsigned c)
{
@@ -395,8 +408,14 @@ static void pstore_register_console(void)
{
register_console(&pstore_console);
}
static void pstore_unregister_console(void)
{
unregister_console(&pstore_console);
}
#else
static void pstore_register_console(void) {}
static void pstore_unregister_console(void) {}
#endif
static int pstore_write_compat(enum pstore_type_id type,
@@ -467,12 +486,28 @@ int pstore_register(struct pstore_info *psi)
*/
backend = psi->name;
module_put(owner);
pr_info("Registered %s as persistent store backend\n", psi->name);
return 0;
}
EXPORT_SYMBOL_GPL(pstore_register);
void pstore_unregister(struct pstore_info *psi)
{
pstore_unregister_pmsg();
pstore_unregister_ftrace();
pstore_unregister_console();
pstore_unregister_kmsg();
free_buf_for_compression();
psinfo = NULL;
backend = NULL;
}
EXPORT_SYMBOL_GPL(pstore_unregister);
/*
* Read all the records from the persistent store. Create
* files in our filesystem. Don't warn about -EEXIST errors