[lkml]   [2012]   [Jul]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[ 10/48] nilfs2: ensure proper cache clearing for gc-inodes
3.2-stable review patch.  If anyone has any objections, please let me know.


From: Ryusuke Konishi <>

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

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 <>
Tested-by: Ryusuke Konishi <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Ben Hutchings <>
fs/nilfs2/gcinode.c | 2 ++
fs/nilfs2/segment.c | 2 ++
2 files changed, 4 insertions(+)

diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index 08a07a2..57ceaf3 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);
+ truncate_inode_pages(&ii->vfs_inode.i_data, 0);
+ nilfs_btnode_cache_clear(&ii->i_btnode_cache);
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 0e72ad6..88e11fb 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))
+ truncate_inode_pages(&ii->vfs_inode.i_data, 0);
+ nilfs_btnode_cache_clear(&ii->i_btnode_cache);

 \ /
  Last update: 2012-07-01 21:01    [W:0.185 / U:0.188 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site