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author | Matthew Garrett <mjg@redhat.com> | 2011-07-21 22:57:55 +0200 |
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committer | Tony Luck <tony.luck@intel.com> | 2011-07-23 01:14:39 +0200 |
commit | dee28e72b619b48ec80a9e5509db458dbe66f71f (patch) | |
tree | 781ef74fc42193f05877af53fe0787d175181bd7 | |
parent | pstore: Make "part" unsigned (diff) | |
download | linux-dee28e72b619b48ec80a9e5509db458dbe66f71f.tar.xz linux-dee28e72b619b48ec80a9e5509db458dbe66f71f.zip |
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: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r-- | Documentation/ABI/testing/pstore | 6 | ||||
-rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
-rw-r--r-- | fs/pstore/platform.c | 11 |
3 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/pstore b/Documentation/ABI/testing/pstore index ddf451ee2a08..ff1df4e3b059 100644 --- a/Documentation/ABI/testing/pstore +++ b/Documentation/ABI/testing/pstore @@ -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. + diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index aa47be71df4c..8789d0c9291a 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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. diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 49ff1de2178a..c5300ec31696 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -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"); |