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authorAnton Vorontsov <anton.vorontsov@linaro.org>2012-07-09 17:10:40 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-17 09:51:38 -0700
commit897dba027445be93f40e5caf550556ca38c48c51 (patch)
tree22b28b1681dd32d9ff9686009c16a5540ce5bc90
parentb2ad368bebc0f772613668e893fa176396e9094c (diff)
downloadlinux-897dba027445be93f40e5caf550556ca38c48c51.tar.bz2
pstore: Introduce write_buf backend callback
For function tracing we need to stop using pstore.buf directly, since in a tracing callback we can't use spinlocks, and thus we can't safely use the global buffer. With write_buf callback, backends no longer need to access pstore.buf directly, and thus we can pass any buffers (e.g. allocated on stack). Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/pstore/platform.c10
-rw-r--r--include/linux/pstore.h4
2 files changed, 14 insertions, 0 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 6b3ff045fe6e..ef5ca8a0255c 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -188,6 +188,14 @@ static void pstore_register_console(void)
static void pstore_register_console(void) {}
#endif
+static int pstore_write_compat(enum pstore_type_id type,
+ enum kmsg_dump_reason reason,
+ u64 *id, unsigned int part,
+ size_t size, struct pstore_info *psi)
+{
+ return psi->write_buf(type, reason, id, part, psinfo->buf, size, psi);
+}
+
/*
* platform specific persistent storage driver registers with
* us here. If pstore is already mounted, call the platform
@@ -212,6 +220,8 @@ int pstore_register(struct pstore_info *psi)
return -EINVAL;
}
+ if (!psi->write)
+ psi->write = pstore_write_compat;
psinfo = psi;
mutex_init(&psinfo->read_mutex);
spin_unlock(&pstore_lock);
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index 1bd014b8e432..b107484192fc 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -48,6 +48,10 @@ struct pstore_info {
int (*write)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi);
+ int (*write_buf)(enum pstore_type_id type,
+ enum kmsg_dump_reason reason, u64 *id,
+ unsigned int part, const char *buf, size_t size,
+ struct pstore_info *psi);
int (*erase)(enum pstore_type_id type, u64 id,
struct pstore_info *psi);
void *data;