linux-stable.git/fs/f2fs/debug.c, branch linux-4.1.y

f2fs: set ->owner for debugfs status file's file_operations

2017-01-13T01:56:54+00:00

[ Upstream commit 05e6ea2685c964db1e675a24a4f4e2adc22d2388 ]

The struct file_operations instance serving the f2fs/status debugfs file
lacks an initialization of its ->owner.

This means that although that file might have been opened, the f2fs module
can still get removed. Any further operation on that opened file, releasing
included,  will cause accesses to unmapped memory.

Indeed, Mike Marshall reported the following:

  BUG: unable to handle kernel paging request at ffffffffa0307430
  IP: [] full_proxy_release+0x24/0x90
  <...>
  Call Trace:
   [] __fput+0xdf/0x1d0
   [] ____fput+0xe/0x10
   [] task_work_run+0x8e/0xc0
   [] do_exit+0x2ae/0xae0
   [] ? __audit_syscall_entry+0xae/0x100
   [] ? syscall_trace_enter+0x1ca/0x310
   [] do_group_exit+0x44/0xc0
   [] SyS_exit_group+0x14/0x20
   [] do_syscall_64+0x61/0x150
   [] entry_SYSCALL64_slow_path+0x25/0x25
  <...>
  ---[ end trace f22ae883fa3ea6b8 ]---
  Fixing recursive fault but reboot is needed!

Fix this by initializing the f2fs/status file_operations' ->owner with
THIS_MODULE.

This will allow debugfs to grab a reference to the f2fs module upon any
open on that file, thus preventing it from getting removed.

Fixes: 902829aa0b72 ("f2fs: move proc files to debugfs")
Reported-by: Mike Marshall 
Reported-by: Martin Brandenburg 
Cc: stable@vger.kernel.org
Signed-off-by: Nicolai Stange 
Signed-off-by: Jaegeuk Kim 
Signed-off-by: Sasha Levin

f2fs: add stat info for moved blocks by background gc

2015-04-10T22:08:32+00:00

This patch is for looking into gc performance of f2fs in detail.

Signed-off-by: Changman Lee 
[Jaegeuk Kim: fix build errors]
Signed-off-by: Jaegeuk Kim

f2fs: show extent tree, node stat info in debugfs

2015-03-03T17:58:47+00:00

This patch add and show stat info of total memory footprint for extent tree,node
in debugfs.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: avoid variable length array

2015-02-12T01:04:50+00:00

Instead of using variable length array, this patch let preallocate memory for
them.

Signed-off-by: Jaegeuk Kim

f2fs: show the number of writeback pages in stat

2015-02-12T01:04:43+00:00

This patch adds the # of writeback pages in stat info.

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: update memory footprint information

2015-02-12T01:04:31+00:00

This patch adds missing memory usages, and splits them in detail.

Signed-off-by: Jaegeuk Kim

f2fs: fix wrong memory footprint statistics in debugfs

2015-02-12T01:04:31+00:00

Our value of memory footprint statistics showed in debugfs is not calculated
correctly. Fix it in this patch.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: add nat/sit entries into status

2015-01-10T01:02:28+00:00

This patch adds NAT/SIT entry informations.

Signed-off-by: Jaegeuk Kim

f2fs: reuse inode_entry_slab in gc procedure for using slab more effectively

2015-01-10T01:02:26+00:00

There are two slab cache inode_entry_slab and winode_slab using the same
structure as below:

struct dir_inode_entry {
	struct list_head list;	/* list head */
	struct inode *inode;	/* vfs inode pointer */
};

struct inode_entry {
	struct list_head list;
	struct inode *inode;
};

It's a little waste that the two cache can not share their memory space for each
other.
So in this patch we remove one redundant winode_slab slab cache, then use more
universal name struct inode_entry as remaining data structure name of slab,
finally we reuse the inode_entry_slab to store dirty dir item and gc item for
more effective.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: add block count by in-place-update in stat info

2015-01-10T01:02:25+00:00

This patch adds block count by in-place-update in stat.

Signed-off-by: Changman Lee 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim