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kmsg - kmsg_dump() use iterator to receive log buffer content

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Provide an iterator to receive the log buffer content, and convert all
kmsg_dump() users to it.

The structured data in the kmsg buffer now contains binary data, which
should no longer be copied verbatim to the kmsg_dump() users.

The iterator should provide reliable access to the buffer data, and also
supports proper log line-aware chunking of data while iterating.

Signed-off-by: Kay Sievers <kay@vrfy.org>
Tested-by: Tony Luck <tony.luck@intel.com>
Reported-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Tested-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kay Sievers 2012-06-15 14:07:51 +02:00 • committed by Greg Kroah-Hartman
parent 1bd289d1e8
commit e2ae715d66
6 changed files with 264 additions and 143 deletions
Download patch file Download diff file Expand all files Collapse all files

45
include/linux/kmsg_dump.h
View file

@ -21,6 +21,7 @@
* is passed to the kernel.
*/
enum kmsg_dump_reason {
KMSG_DUMP_UNDEF,
KMSG_DUMP_PANIC,
KMSG_DUMP_OOPS,
KMSG_DUMP_EMERG,
@ -31,23 +32,37 @@ enum kmsg_dump_reason {
/**
* struct kmsg_dumper - kernel crash message dumper structure
* @dump: The callback which gets called on crashes. The buffer is passed
* as two sections, where s1 (length l1) contains the older
* messages and s2 (length l2) contains the newer.
* @list: Entry in the dumper list (private)
* @dump: Call into dumping code which will retrieve the data with
* through the record iterator
* @max_reason: filter for highest reason number that should be dumped
* @registered: Flag that specifies if this is already registered
*/
struct kmsg_dumper {
void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
const char *s1, unsigned long l1,
const char *s2, unsigned long l2);
struct list_head list;
int registered;
void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
enum kmsg_dump_reason max_reason;
bool active;
bool registered;
/* private state of the kmsg iterator */
u32 cur_idx;
u32 next_idx;
u64 cur_seq;
u64 next_seq;
};
#ifdef CONFIG_PRINTK
void kmsg_dump(enum kmsg_dump_reason reason);
bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
char *line, size_t size, size_t *len);
bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
char *buf, size_t size, size_t *len);
void kmsg_dump_rewind(struct kmsg_dumper *dumper);
int kmsg_dump_register(struct kmsg_dumper *dumper);
int kmsg_dump_unregister(struct kmsg_dumper *dumper);
@ -56,6 +71,22 @@ static inline void kmsg_dump(enum kmsg_dump_reason reason)
{
}
bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
const char *line, size_t size, size_t *len)
{
return false;
}
bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
char *buf, size_t size, size_t *len)
{
return false;
}
void kmsg_dump_rewind(struct kmsg_dumper *dumper)
{
}
static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
{
return -EINVAL;