linux-stable.git/fs/f2fs/debug.c, branch v4.9.78

f2fs: remove percpu_count due to performance regression

2017-01-12T10:39:35+00:00

commit 35782b233f37e48ecc469d9c7232f3f6a7fad41a upstream.

This patch removes percpu_count usage due to performance regression in iozone.

Fixes: 523be8a6b3 ("f2fs: use percpu_counter for page counters")
Signed-off-by: Jaegeuk Kim 
Signed-off-by: Greg Kroah-Hartman

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

2017-01-06T09:40:14+00:00

commit 05e6ea2685c964db1e675a24a4f4e2adc22d2388 upstream.

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 
Signed-off-by: Nicolai Stange 
Signed-off-by: Jaegeuk Kim 
Signed-off-by: Greg Kroah-Hartman

f2fs: show dirty inode number

2016-09-22T18:43:07+00:00

This patch enables showing dirty inode number in procfs.

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

f2fs: add discard info to sys entry of f2fs status

2016-08-30T01:31:06+00:00

This patch add discard block count to sys entry of f2fs status

Signed-off-by: Yunlei He 
Signed-off-by: Jaegeuk Kim

f2fs: do not use discard_map for hard disks

2016-08-24T17:16:14+00:00

We don't need to keep discard_map, if disk does not support discard command.

Signed-off-by: Jaegeuk Kim

f2fs: flush inode metadata when checkpoint is doing

2016-06-03T01:05:11+00:00

This patch registers all the inodes which have dirty metadata to sync when
checkpoint is doing.

Signed-off-by: Jaegeuk Kim

f2fs: use percpu_counter for page counters

2016-05-18T20:57:27+00:00

This patch substitutes percpu_counter for atomic_counter when counting
various types of pages.

Signed-off-by: Jaegeuk Kim

f2fs: use bio count instead of F2FS_WRITEBACK page count

2016-05-18T20:57:25+00:00

This can reduce page counting overhead.

Signed-off-by: Jaegeuk Kim

f2fs: show # of orphan inodes

2016-05-11T16:56:36+00:00

This adds debug information for # of orphan inodes.

Signed-off-by: Jaegeuk Kim

f2fs: show current mount status

2016-04-15T15:49:47+00:00

This patch remains the current mount status to f2fs status info.

Signed-off-by: Jaegeuk Kim