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Commit fb0af3f2 authored by Josh Boyer's avatar Josh Boyer Committed by Tony Luck
Browse files

pstore: Create a convenient mount point for pstore 



Using /dev/pstore as a mount point for the pstore filesystem is slightly
awkward.  We don't normally mount filesystems in /dev/ and the /dev/pstore
file isn't created automatically by anything.  While this method will
still work, we can create a persistent mount point in sysfs.  This will
put pstore on par with things like cgroups and efivarfs.

Signed-off-by: default avatarJosh Boyer <jwboyer@redhat.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent a93bc0c6

Documentation/ABI/testing/pstore

+5 −5
Original line number Diff line number Diff line 
Where:		/dev/pstore/...

Where:		/sys/fs/pstore/... (or /dev/pstore/...)

Date:		March 2011

Kernel Version: 2.6.39

Contact:	tony.luck@intel.com
@@ -11,9 +11,9 @@ 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 -o kmsg_bytes=8000 - /dev/pstore

		# mount -t pstore -o kmsg_bytes=8000 - /sys/fs/pstore



		$ ls -l /dev/pstore

		$ ls -l /sys/fs/pstore/

		total 0

		-r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-erst-1
@@ -27,9 +27,9 @@ Description: Generic interface to platform dependent persistent storage. 
		the file will signal to the underlying persistent storage

		device that it can reclaim the space for later re-use.



		$ rm /dev/pstore/dmesg-erst-1

		$ rm /sys/fs/pstore/dmesg-erst-1



		The expectation is that all files in /dev/pstore

		The expectation is that all files in /sys/fs/pstore/

		will be saved elsewhere and erased from persistent store

		soon after boot to free up space ready for the next

		catastrophe.

fs/pstore/inode.c

+17 −1
Original line number Diff line number Diff line
@@ -418,9 +418,25 @@ static struct file_system_type pstore_fs_type = { 
	.kill_sb	= pstore_kill_sb,

};



static struct kobject *pstore_kobj;



static int __init init_pstore_fs(void)

{

	return register_filesystem(&pstore_fs_type);

	int err = 0;



	/* Create a convenient mount point for people to access pstore */

	pstore_kobj = kobject_create_and_add("pstore", fs_kobj);

	if (!pstore_kobj) {

		err = -ENOMEM;

		goto out;

	}



	err = register_filesystem(&pstore_fs_type);

	if (err < 0)

		kobject_put(pstore_kobj);



out:

	return err;

}

module_init(init_pstore_fs)