linux.git/fs/pstore/platform.c, branch v4.2

fs/pstore: update the backend parameter in pstore module

2015-05-21T16:34:22+00:00

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

2015-05-21T16:26:19+00:00

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()

2015-01-17T00:01:29+00:00

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

pstore: Add pmsg - user-space accessible pstore object

2015-01-17T00:01:10+00:00

A secured user-space accessible pstore object. Writes
to /dev/pmsg0 are appended to the buffer, on reboot
the persistent contents are available in
/sys/fs/pstore/pmsg-ramoops-[ID].

One possible use is syslogd, or other daemon, can
write messages, then on reboot provides a means to
triage user-space activities leading up to a panic
as a companion to the pstore dmesg or console logs.

Signed-off-by: Mark Salyzyn 
Acked-by: Kees Cook 
Signed-off-by: Tony Luck

fs/pstore: logging clean-up

2014-06-06T23:08:13+00:00

- Define pr_fmt in plateform.c and ram_core.c for global prefix.

- Coalesce format fragments.

- Separate format/arguments on lines > 80 characters.

Note: Some pr_foo() were initially declared without prefix and therefore
this could break existing log analyzer.

[akpm@linux-foundation.org: missed a couple of prefix removals]
Signed-off-by: Fabian Frederick 
Cc: Joe Perches 
Cc: Anton Vorontsov 
Cc: Colin Cross 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pstore: Fix memory leak when decompress using big_oops_buf

2014-03-17T21:14:03+00:00

After sucessful decompressing, the buffer which pointed by 'buf' will be
lost as 'buf' is overwrite by 'big_oops_buf' and will never be freed.

Signed-off-by: Liu ShuoX 
Acked-by: Kees Cook 
Signed-off-by: Tony Luck

pstore: Don't allow high traffic options on fragile devices

2013-12-20T21:12:01+00:00

Some pstore backing devices use on board flash as persistent
storage. These have limited numbers of write cycles so it
is a poor idea to use them from high frequency operations.

Signed-off-by: Tony Luck 
Signed-off-by: Linus Torvalds

pstore: Remove the messages related to compression failure

2013-09-16T16:28:29+00:00

Remove the messages indicating compression failure as it will
add to the space during panic path.

Reported-by: Seiji Aguchi 
Tested-by: Seiji Aguchi 
Signed-off-by: Aruna Balakrishnaiah 
Signed-off-by: Tony Luck

pstore: Use zlib_inflateInit2 instead of zlib_inflateInit

2013-09-16T16:28:29+00:00

Since zlib_deflateInit2() is used for specifying window bit during compression,
zlib_inflateInit2() is appropriate for decompression.

Reported-by: Seiji Aguchi 
Tested-by: Seiji Aguchi 
Signed-off-by: Aruna Balakrishnaiah 
Signed-off-by: Tony Luck

pstore: Adjust buffer size for compression for smaller registered buffers

2013-09-16T16:28:28+00:00

When backends (ex: efivars) have smaller registered buffers, the
big_oops_buf is too big for them as number of repeated occurences
in the text captured will be less. What happens is that pstore takes
too big a bite from the dmesg log and then finds it cannot compress it
enough to meet the backend block size. Patch takes care of adjusting
the buffer size based on the registered buffer size. cmpr values have
been arrived after doing experiments with plain text for buffers of
size 1k - 4k (Smaller the buffer size repeated occurence will be less)
and with sample crash log for buffers ranging from 4k - 10k.

Reported-by: Seiji Aguchi 
Tested-by: Seiji Aguchi 
Signed-off-by: Aruna Balakrishnaiah 
Signed-off-by: Tony Luck