kernel.git/fs/pstore/platform.c, branch linux-4.8.y

pstore: add lzo/lz4 compression support

2016-06-02T17:59:31Z

Like zlib compression in pstore, this patch added lzo and lz4 compression support so that users can have more options and better compression ratio. The original code treats the compressed data together with the uncompressed ECC correction notice by using zlib decompress. The ECC correction notice is missing in the decompression process. The treatment also makes lzo and lz4 not working. So I treat them separately by using pstore_decompress() to treat the compressed data, and memcpy() to treat the uncompressed ECC correction notice. Signed-off-by: Geliang Tang Signed-off-by: Kees Cook

pstore: Cleanup pstore_dump()

2016-05-31T19:36:45Z

The code is duplicate between compression is enabled or not. Signed-off-by: Namhyung Kim Signed-off-by: Kees Cook

pstore: Enable compression on normal path (again)

2016-05-31T19:36:44Z

The commit f0e2efcfd2717 ("pstore: do not use message compression without lock") added a check to 'is_locked' to avoid breakage in concurrent accesses. But it has a side-effect of disabling compression on normal path since 'is_locked' variable is not set. As normal path always takes the lock, it should be initialized to 1. This also makes the unlock code a bit simpler. Signed-off-by: Namhyung Kim Signed-off-by: Kees Cook

ramoops: Only unregister when registered

2016-05-31T19:36:44Z

While none of the "fragile" pstore backends unregister yet, if they ever did, the unregistering code for the non-dump targets might get confused. This adds a check for fragile backends on unregister. Signed-off-by: Kees Cook

pstore: fix code comment to match code

2015-11-02T21:41:52Z

Fix code comment about kmsg_dump register so it matches the code. Signed-off-by: Geliang Tang Signed-off-by: Tony Luck

pstore: add pstore unregister

2015-10-22T15:59:18Z

pstore doesn't support unregistering yet. It was marked as TODO. This patch adds some code to fix it: 1) Add functions to unregister kmsg/console/ftrace/pmsg. 2) Add a function to free compression buffer. 3) Unmap the memory and free it. 4) Add a function to unregister pstore filesystem. Signed-off-by: Geliang Tang Acked-by: Kees Cook [Removed __exit annotation from ramoops_remove(). Reported by Arnd Bergmann] Signed-off-by: Tony Luck

pstore: add a helper function pstore_register_kmsg

2015-10-21T16:27:10Z

Add a new wrapper function pstore_register_kmsg to keep the consistency with other similar pstore_register_* functions. Signed-off-by: Geliang Tang Signed-off-by: Tony Luck

fs/pstore: update the backend parameter in pstore module

2015-05-21T16:34:22Z

This patch update the module parameter backend, so it is visible through /sys/module/pstore/parameters/backend. For example: if pstore backend is ramoops, with this patch: # cat /sys/module/pstore/parameters/backend ramoops and without this patch: # cat /sys/module/pstore/parameters/backend (null) Signed-off-by: Wang Long Acked-by: Mark Salyzyn Signed-off-by: Tony Luck

pstore: do not use message compression without lock

2015-05-21T16:26:19Z

pstore_compress() uses static stream buffer for zlib-deflate which easily crashes when several concurrent threads use one shared state. Signed-off-by: Konstantin Khlebnikov Signed-off-by: Tony Luck

pstore: Fix sprintf format specifier in pstore_dump()

2015-01-17T00:01:29Z

We should use sprintf format specifier "%u" instead of "%d" for argument of type 'unsigned int' in pstore_dump(). Signed-off-by: Alex Chen Reviewed-by: Joseph Qi Acked-by: Kees Cook Signed-off-by: Tony Luck