linux/fs/udf
Jan Kara 4ea7772f82 udf: Fix lockdep warning from udf_symlink()
Lockdep is complaining about UDF:
=============================================
[ INFO: possible recursive locking detected ]
3.12.0+ #16 Not tainted
---------------------------------------------
ln/7386 is trying to acquire lock:
 (&ei->i_data_sem){+.+...}, at: [<ffffffff8142f06d>] udf_get_block+0x8d/0x130

but task is already holding lock:
 (&ei->i_data_sem){+.+...}, at: [<ffffffff81431a8d>] udf_symlink+0x8d/0x690

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&ei->i_data_sem);
  lock(&ei->i_data_sem);

 *** DEADLOCK ***

This is because we hold i_data_sem of the symlink inode while calling
udf_add_entry() for the directory. I don't think this can ever lead to
deadlocks since we never hold i_data_sem for two inodes in any other
place.

The fix is simple - move unlock of i_data_sem for symlink inode up. We
don't need it for anything when linking symlink inode to directory.

Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
2013-12-23 22:02:16 +01:00
..
Kconfig Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-udf-2.6 2011-01-11 14:45:52 -08:00
Makefile switch udf to simple_fsync() 2009-06-11 21:36:13 -04:00
balloc.c udf: Fix handling of i_blocks 2012-02-29 21:53:47 +01:00
dir.c [readdir] convert udf 2013-06-29 12:46:50 +04:00
directory.c udf: Neaten udf_debug uses 2011-10-31 23:43:58 +01:00
ecma_167.h Remove struct typedefs from fs/udf/ecma_167.h et al. 2009-04-02 12:29:47 +02:00
file.c aio: Kill aio_rw_vect_retry() 2013-07-30 11:53:12 -04:00
ialloc.c udf: Fortify LVID loading 2013-09-24 11:23:33 +02:00
inode.c truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
lowlevel.c udf: Neaten udf_debug uses 2011-10-31 23:43:58 +01:00
misc.c udf: Rename udf_error to udf_err 2011-10-10 19:29:01 +02:00
namei.c udf: Fix lockdep warning from udf_symlink() 2013-12-23 22:02:16 +01:00
osta_udf.h Remove struct typedefs from fs/udf/ecma_167.h et al. 2009-04-02 12:29:47 +02:00
partition.c udf: Cleanup metadata flags handling 2011-10-31 23:49:48 +01:00
super.c udf: fix for pathetic mount times in case of invalid file system 2013-10-18 22:39:07 +02:00
symlink.c udf: Treat symlink component of type 2 as / 2012-01-09 13:52:08 +01:00
truncate.c udf: Do not decrement i_blocks when freeing indirect extent block 2012-07-09 13:24:21 +02:00
udf_i.h udf: add extent cache support in case of file reading 2013-01-22 10:48:31 +01:00
udf_sb.h udf: Fortify LVID loading 2013-09-24 11:23:33 +02:00
udfdecl.h udf: add extent cache support in case of file reading 2013-01-22 10:48:31 +01:00
udfend.h Remove struct typedefs from fs/udf/ecma_167.h et al. 2009-04-02 12:29:47 +02:00
udftime.c udf: Convert printks to pr_<level> 2011-10-31 23:43:52 +01:00
unicode.c udf: Convert printks to pr_<level> 2011-10-31 23:43:52 +01:00