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pstore: Allow the user to explicitly choose a backend

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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: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Matthew Garrett 2011-07-21 16:57:55 -04:00 committed by Tony Luck
parent b94fdd077e
commit dee28e72b6
3 changed files with 19 additions and 0 deletions
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6
Documentation/ABI/testing/pstore
View File

@ -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.

2
Documentation/kernel-parameters.txt
View File

@ -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.

11
fs/pstore/platform.c
View File

@ -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");