diff options
| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2012-06-20 12:52:57 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-16 08:47:38 -0700 |
| commit | f66c6795bdc2dd43b749e90a07c3e1f12caafede (patch) | |
| tree | 121f4e0703fcb89cc71f2260fd0052b303218f87 /fs/nilfs2 | |
| parent | cd2ae436c3ef59659ba10754213c8614d256dc86 (diff) | |
nilfs2: ensure proper cache clearing for gc-inodes
commit fbb24a3a915f105016f1c828476be11aceac8504 upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/nilfs2')
| -rw-r--r-- | fs/nilfs2/gcinode.c | 2 | ||||
| -rw-r--r-- | fs/nilfs2/segment.c | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c index 08a07a218d2..57ceaf33d17 100644 --- a/fs/nilfs2/gcinode.c +++ b/fs/nilfs2/gcinode.c @@ -191,6 +191,8 @@ void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs) while (!list_empty(head)) { ii = list_first_entry(head, struct nilfs_inode_info, i_dirty); list_del_init(&ii->i_dirty); + truncate_inode_pages(&ii->vfs_inode.i_data, 0); + nilfs_btnode_cache_clear(&ii->i_btnode_cache); iput(&ii->vfs_inode); } } diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c index bb24ab6c282..6f24e67162c 100644 --- a/fs/nilfs2/segment.c +++ b/fs/nilfs2/segment.c @@ -2309,6 +2309,8 @@ nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head) if (!test_bit(NILFS_I_UPDATED, &ii->i_state)) continue; list_del_init(&ii->i_dirty); + truncate_inode_pages(&ii->vfs_inode.i_data, 0); + nilfs_btnode_cache_clear(&ii->i_btnode_cache); iput(&ii->vfs_inode); } } |