linux/fs/nilfs2
Ryusuke Konishi fbb24a3a91 nilfs2: ensure proper cache clearing for gc-inodes
A gc-inode is a pseudo inode used to buffer the blocks to be moved by
garbage collection.

Block caches of gc-inodes must be cleared every time a garbage collection
function (nilfs_clean_segments) completes.  Otherwise, stale blocks
buffered in the caches may be wrongly reused in successive calls of the GC
function.

For user files, this is not a problem because their gc-inodes are
distinguished by a checkpoint number as well as an inode number.  They
never buffer different blocks if either an inode number, a checkpoint
number, or a block offset differs.

However, gc-inodes of sufile, cpfile and DAT file can store different data
for the same block offset.  Thus, the nilfs_clean_segments function can
move incorrect block for these meta-data files if an old block is cached.
I found this is really causing meta-data corruption in nilfs.

This fixes the issue by ensuring cache clear of gc-inodes and resolves
reported GC problems including checkpoint file corruption, b-tree
corruption, and the following warning during GC.

  nilfs_palloc_freev: entry number 307234 already freed.
  ...

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: <stable@vger.kernel.org>	[2.6.37+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-20 14:39:35 -07:00
..
alloc.c nilfs2: use mark_buffer_dirty to mark btnode or meta data dirty 2011-05-10 22:21:57 +09:00
alloc.h nilfs2: use little-endian bitops 2011-03-23 19:46:18 -07:00
bmap.c nilfs2: get rid of NILFS_I_NILFS 2011-05-10 22:21:56 +09:00
bmap.h nilfs2: record used amount of each checkpoint in checkpoint list 2011-03-08 14:58:31 +09:00
btnode.c nilfs2: use mark_buffer_dirty to mark btnode or meta data dirty 2011-05-10 22:21:57 +09:00
btnode.h nilfs2: use mark_buffer_dirty to mark btnode or meta data dirty 2011-05-10 22:21:57 +09:00
btree.c nilfs2: fix missing block address termination in btree node shrinking 2011-06-11 15:51:15 +09:00
btree.h nilfs2: get rid of nilfs_bmap_union 2010-07-23 10:02:14 +09:00
cpfile.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
cpfile.h nilfs2: use iget for all metadata files 2010-10-23 09:24:38 +09:00
dat.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
dat.h nilfs2: use iget for all metadata files 2010-10-23 09:24:38 +09:00
dir.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
direct.c nilfs2: record used amount of each checkpoint in checkpoint list 2011-03-08 14:58:31 +09:00
direct.h nilfs2: get rid of nilfs_bmap_union 2010-07-23 10:02:14 +09:00
export.h nilfs2: make snapshots in checkpoint tree exportable 2010-10-23 09:24:34 +09:00
file.c nilfs2: flush disk caches in syncing 2012-05-31 17:49:27 -07:00
gcinode.c nilfs2: ensure proper cache clearing for gc-inodes 2012-06-20 14:39:35 -07:00
ifile.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
ifile.h nilfs2: use iget for all metadata files 2010-10-23 09:24:38 +09:00
inode.c vfs: Rename end_writeback() to clear_inode() 2012-05-06 13:43:41 +08:00
ioctl.c nilfs2: flush disk caches in syncing 2012-05-31 17:49:27 -07:00
Kconfig
Makefile nilfs2: get rid of GCDAT inode 2010-10-23 09:24:38 +09:00
mdt.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
mdt.h nilfs2: use mark_buffer_dirty to mark btnode or meta data dirty 2011-05-10 22:21:57 +09:00
namei.c ->encode_fh() API change 2012-05-29 23:28:33 -04:00
nilfs.h nilfs: propagate umode_t 2012-01-03 22:55:04 -05:00
page.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
page.h nilfs2: use mark_buffer_dirty to mark btnode or meta data dirty 2011-05-10 22:21:57 +09:00
recovery.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
segbuf.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
segbuf.h nilfs2: get rid of macros for segment summary information 2010-07-23 10:02:09 +09:00
segment.c nilfs2: ensure proper cache clearing for gc-inodes 2012-06-20 14:39:35 -07:00
segment.h nilfs2: get rid of private page allocator 2011-05-10 22:21:44 +09:00
sufile.c nilfs2: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
sufile.h nilfs2: get rid of NILFS_I_NILFS 2011-05-10 22:21:56 +09:00
super.c switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
the_nilfs.c nilfs2: fix NULL pointer dereference in nilfs_load_super_block() 2012-03-16 17:14:44 -07:00
the_nilfs.h nilfs2: implement resize ioctl 2011-05-10 22:21:46 +09:00