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authorMatthew Garrett <mjg@redhat.com>2011-07-21 16:57:55 -0400
committerTony Luck <tony.luck@intel.com>2011-07-22 19:14:39 -0400
commitdee28e72b619b48ec80a9e5509db458dbe66f71f (patch)
tree781ef74fc42193f05877af53fe0787d175181bd7 /fs/pstore
parentb94fdd077eef5e6cab56836bf62695b497946716 (diff)
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>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/platform.c11
1 files changed, 11 insertions, 0 deletions
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 @@
37static DEFINE_SPINLOCK(pstore_lock); 37static DEFINE_SPINLOCK(pstore_lock);
38static struct pstore_info *psinfo; 38static struct pstore_info *psinfo;
39 39
40static char *backend;
41
40/* How much of the console log to snapshot */ 42/* How much of the console log to snapshot */
41static unsigned long kmsg_bytes = 10240; 43static unsigned long kmsg_bytes = 10240;
42 44
@@ -131,6 +133,12 @@ int pstore_register(struct pstore_info *psi)
131 spin_unlock(&pstore_lock); 133 spin_unlock(&pstore_lock);
132 return -EBUSY; 134 return -EBUSY;
133 } 135 }
136
137 if (backend && strcmp(backend, psi->name)) {
138 spin_unlock(&pstore_lock);
139 return -EINVAL;
140 }
141
134 psinfo = psi; 142 psinfo = psi;
135 spin_unlock(&pstore_lock); 143 spin_unlock(&pstore_lock);
136 144
@@ -208,3 +216,6 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size)
208 return 0; 216 return 0;
209} 217}
210EXPORT_SYMBOL_GPL(pstore_write); 218EXPORT_SYMBOL_GPL(pstore_write);
219
220module_param(backend, charp, 0444);
221MODULE_PARM_DESC(backend, "Pstore backend to use");