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Commit dee28e72 authored by Matthew Garrett's avatar Matthew Garrett Committed by Tony Luck
Browse files

pstore: Allow the user to explicitly choose a backend 



pstore only allows one backend to be registered at present, but the
system may provide several. Add a parameter to allow the user to choose
which backend will be used rather than just relying on load order.

Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent b94fdd07

Documentation/ABI/testing/pstore

+6 −0
Original line number Diff line number Diff line
@@ -39,3 +39,9 @@ Description: Generic interface to platform dependent persistent storage. 
		multiple) files based on the record size of the underlying

		persistent storage until at least this amount is reached.

		Default is 10 Kbytes.



		Pstore only supports one backend at a time. If multiple

		backends are available, the preferred backend may be

		set by passing the pstore.backend= argument to the kernel at

		boot time.

Documentation/kernel-parameters.txt

+2 −0
Original line number Diff line number Diff line
@@ -2151,6 +2151,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
			[HW,MOUSE] Controls Logitech smartscroll autorepeat.

			0 = disabled, 1 = enabled (default).



	pstore.backend=	Specify the name of the pstore backend to use



	pt.		[PARIDE]

			See Documentation/blockdev/paride.txt.

fs/pstore/platform.c

+11 −0
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ 
static DEFINE_SPINLOCK(pstore_lock);

static struct pstore_info *psinfo;



static char *backend;



/* How much of the console log to snapshot */

static unsigned long kmsg_bytes = 10240;
@@ -131,6 +133,12 @@ int pstore_register(struct pstore_info *psi) 
		spin_unlock(&pstore_lock);

		return -EBUSY;

	}



	if (backend && strcmp(backend, psi->name)) {

		spin_unlock(&pstore_lock);

		return -EINVAL;

	}



	psinfo = psi;

	spin_unlock(&pstore_lock);
@@ -208,3 +216,6 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size) 
	return 0;

}

EXPORT_SYMBOL_GPL(pstore_write);



module_param(backend, charp, 0444);

MODULE_PARM_DESC(backend, "Pstore backend to use");