pstore: use mount option instead sysfs to tweak kmsg_bytes

/sys/fs is a somewhat strange way to tweak what could more
obviously be tuned with a mount option.

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 9 insertions, 10 deletions

diff --git a/Documentation/ABI/testing/pstore b/Documentation/ABI/testing/pstore
index f1fb2a00426..ddf451ee2a0 100644
--- a/Documentation/ABI/testing/pstore
+++ b/Documentation/ABI/testing/pstore
@@ -1,6 +1,6 @@
 Where:          /dev/pstore/...
-Date:           January 2011
-Kernel Version: 2.6.38
+Date:           March 2011
+Kernel Version: 2.6.39
 Contact:        tony.luck@intel.com
 Description:    Generic interface to platform dependent persistent storage.
 
@@ -11,7 +11,7 @@ Description:	Generic interface to platform dependent persistent storage.
                 of the console log is captured, but other interesting
                 data can also be saved.
 
-                # mount -t pstore - /dev/pstore
+                # mount -t pstore -o kmsg_bytes=8000 - /dev/pstore
 
                 $ ls -l /dev/pstore
                 total 0
@@ -33,3 +33,9 @@ Description:	Generic interface to platform dependent persistent storage.
                 will be saved elsewhere and erased from persistent store
                 soon after boot to free up space ready for the next
                 catastrophe.
+
+                The 'kmsg_bytes' mount option changes the target amount of
+                data saved on each oops/panic. Pstore saves (possibly
+                multiple) files based on the record size of the underlying
+                persistent storage until at least this amount is reached.
+                Default is 10 Kbytes.
diff --git a/Documentation/ABI/testing/sysfs-fs-pstore b/Documentation/ABI/testing/sysfs-fs-pstore
deleted file mode 100644
index 8e659d85480..00000000000
--- a/Documentation/ABI/testing/sysfs-fs-pstore
+++ /dev/null
@@ -1,7 +0,0 @@
-What:           /sys/fs/pstore/kmsg_bytes
-Date:           January 2011
-Kernel Version: 2.6.38
-Contact:        "Tony Luck" <tony.luck@intel.com>
-Description:
-                Controls amount of console log that will be saved
-                to persistent store on oops/panic.