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pstore: Introduce write_buf backend callback

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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>
This commit is contained in:
Anton Vorontsov
2012-07-09 17:10:40 -07:00
committed by Greg Kroah-Hartman
parent b2ad368beb
commit 897dba0274
2 changed files with 14 additions and 0 deletions
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10
fs/pstore/platform.c
View File

@@ -188,6 +188,14 @@ static void pstore_register_console(void)
static void pstore_register_console(void) {} static void pstore_register_console(void) {}
#endif #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 * platform specific persistent storage driver registers with
* us here. If pstore is already mounted, call the platform * us here. If pstore is already mounted, call the platform
@@ -212,6 +220,8 @@ int pstore_register(struct pstore_info *psi)
return -EINVAL; return -EINVAL;
} }
if (!psi->write)
psi->write = pstore_write_compat;
psinfo = psi; psinfo = psi;
mutex_init(&psinfo->read_mutex); mutex_init(&psinfo->read_mutex);
spin_unlock(&pstore_lock); spin_unlock(&pstore_lock);

4
include/linux/pstore.h
View File

@@ -48,6 +48,10 @@ struct pstore_info {
int (*write)(enum pstore_type_id type, int (*write)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id, enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi); 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, int (*erase)(enum pstore_type_id type, u64 id,
struct pstore_info *psi); struct pstore_info *psi);
void *data; void *data;