Jaegeuk Kim dd802406e3 f2fs: avoid double lock for cp_rwsem ...

The __f2fs_add_link is covered by cp_rwsem all the time.
This calls init_inode_metadata, which conducts some acl operations including
memory allocation with GFP_KERNEL previously.
But, under memory pressure, f2fs_write_data_page can be called, which also
grabs cp_rwsem too.

In this case, this incurs a deadlock pointed by Chao.
Thread #1        Thread #2
 down_read
                 down_write
  down_read
 -> here down_read should wait forever.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

2015-01-09 17:02:25 -08:00

..

acl.c

f2fs: avoid double lock for cp_rwsem

2015-01-09 17:02:25 -08:00

acl.h

f2fs: avoid deadlock on init_inode_metadata

2014-11-03 16:07:33 -08:00

checkpoint.c

f2fs: activate f2fs_trace_pid

2015-01-09 17:02:24 -08:00

data.c

f2fs: activate f2fs_trace_ios

2015-01-09 17:02:24 -08:00

debug.c

f2fs: use atomic for counting inode with inline_{dir,inode} flag

2014-12-08 10:54:59 -08:00

dir.c

f2fs: use missing the use of f2fs_kunmap_page

2015-01-09 17:02:22 -08:00

f2fs.h

f2fs: use f2fs_io_info to clean up messy parameters during IO path

2015-01-09 17:02:23 -08:00

file.c

f2fs: activate f2fs_trace_ios

2015-01-09 17:02:24 -08:00

gc.c

f2fs: do retry operations with cond_resched

2014-12-08 10:35:05 -08:00

gc.h

f2fs: more fast lookup for gc_inode list

2014-12-02 11:02:50 -08:00

hash.c

f2fs: fix wrong casting for dentry name

2014-08-29 00:26:50 -07:00

inline.c

f2fs: use f2fs_io_info to clean up messy parameters during IO path

2015-01-09 17:02:23 -08:00

inode.c

f2fs: change atomic and volatile write policies

2015-01-09 17:02:22 -08:00

Kconfig

f2fs: add f2fs_io_tracer support

2015-01-09 17:02:24 -08:00

Makefile

f2fs: add f2fs_io_tracer support

2015-01-09 17:02:24 -08:00

namei.c

f2fs: introduce f2fs_dentry_kunmap to clean up

2014-11-23 21:51:53 -08:00

node.c

f2fs: activate f2fs_trace_pid

2015-01-09 17:02:24 -08:00

node.h

f2fs: merge two uchar variable in struct node_info to reduce memory cost

2015-01-09 17:02:23 -08:00

recovery.c

f2fs: avoid to ra unneeded blocks in recover flow

2014-12-08 14:19:09 -08:00

segment.c

f2fs: activate f2fs_trace_pid

2015-01-09 17:02:24 -08:00

segment.h

f2fs: do not skip any writes under memory pressure

2014-11-10 06:51:38 -08:00

super.c

f2fs: activate f2fs_trace_ios

2015-01-09 17:02:24 -08:00

trace.c

f2fs: add key functions for f2fs_io_tracer

2015-01-09 17:02:24 -08:00

trace.h

f2fs: add key functions for f2fs_io_tracer

2015-01-09 17:02:24 -08:00

xattr.c

f2fs: avoid deadlock on init_inode_metadata

2014-11-03 16:07:33 -08:00

xattr.h

f2fs: avoid deadlock on init_inode_metadata

2014-11-03 16:07:33 -08:00