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authorJoern Engel <joern@logfs.org>2010-03-27 09:56:58 +0100
committerJoern Engel <joern@logfs.org>2010-03-28 12:40:42 +0200
commit193219172691e29813821dc8433317768c6ed1a3 (patch)
tree9df87e5fa573deddd1d7b89da3005567308a2ab3
parent6f2e9e6a950a165a7d2c399ab7557e6745ef2bfd (diff)
Prevent data corruption in logfs_rewrite_block()
The comment was correct, so make the code match the comment. As the new comment indicates, we might be able to do a little less work. But for the current -rc series let's keep it simple and just fix the bug. Signed-off-by: Joern Engel <joern@logfs.org>
-rw-r--r--fs/logfs/readwrite.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index 7a23b3e7c0a..c3a3a6814b8 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -1594,7 +1594,6 @@ int logfs_delete(struct inode *inode, pgoff_t index,
return ret;
}
-/* Rewrite cannot mark the inode dirty but has to write it immediatly. */
int logfs_rewrite_block(struct inode *inode, u64 bix, u64 ofs,
gc_level_t gc_level, long flags)
{
@@ -1611,6 +1610,18 @@ int logfs_rewrite_block(struct inode *inode, u64 bix, u64 ofs,
if (level != 0)
alloc_indirect_block(inode, page, 0);
err = logfs_write_buf(inode, page, flags);
+ if (!err && shrink_level(gc_level) == 0) {
+ /* Rewrite cannot mark the inode dirty but has to
+ * write it immediatly.
+ * Q: Can't we just create an alias for the inode
+ * instead? And if not, why not?
+ */
+ if (inode->i_ino == LOGFS_INO_MASTER)
+ logfs_write_anchor(inode->i_sb);
+ else {
+ err = __logfs_write_inode(inode, flags);
+ }
+ }
}
logfs_put_write_page(page);
return err;