The patch titled
Subject: nilfs2: ensure proper cache clearing for gc-inodes
has been added to the -mm tree. Its filename is
nilfs2-ensure-proper-cache-clearing-for-gc-inodes.patch
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From: Ryusuke Konishi <[email protected]>
Subject: 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 <[email protected]>
Tested-by: Ryusuke Konishi <[email protected]>
Cc: <[email protected]> [2.6.37+]
Signed-off-by: Andrew Morton <[email protected]>
---
fs/nilfs2/gcinode.c | 2 ++
fs/nilfs2/segment.c | 2 ++
2 files changed, 4 insertions(+)
diff -puN fs/nilfs2/gcinode.c~nilfs2-ensure-proper-cache-clearing-for-gc-inodes
fs/nilfs2/gcinode.c
--- a/fs/nilfs2/gcinode.c~nilfs2-ensure-proper-cache-clearing-for-gc-inodes
+++ a/fs/nilfs2/gcinode.c
@@ -191,6 +191,8 @@ void nilfs_remove_all_gcinodes(struct th
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 -puN fs/nilfs2/segment.c~nilfs2-ensure-proper-cache-clearing-for-gc-inodes
fs/nilfs2/segment.c
--- a/fs/nilfs2/segment.c~nilfs2-ensure-proper-cache-clearing-for-gc-inodes
+++ a/fs/nilfs2/segment.c
@@ -2309,6 +2309,8 @@ nilfs_remove_written_gcinodes(struct the
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);
}
}
_
Subject: Subject: nilfs2: ensure proper cache clearing for gc-inodes
Patches currently in -mm which might be from [email protected] are
nilfs2-ensure-proper-cache-clearing-for-gc-inodes.patch
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