From fb46f341d9868fe993626536c7449c2a1aec62a3 Mon Sep 17 00:00:00 2001 From: Lepton Wu Date: Tue, 16 Oct 2007 23:30:04 -0700 Subject: [PATCH] reiserfs: workaround for dead loop in finish_unfinished There is possible dead loop in finish_unfinished function. In most situation, the call chain iput -> ... -> reiserfs_delete_inode -> remove_save_link will success. But for some reason such as data corruption, reiserfs_delete_inode fails on reiserfs_do_truncate -> search_for_position_by_key. Then remove_save_link won't be called. We always get the same "save_link_key" in the while loop in finish_unfinished function. The following patch adds a check for the possible dead loop and just remove save link when deap loop. [akpm@linux-foundation.org: cleanups] Signed-off-by: Lepton Wu Cc: Chris Mason Cc: Jeff Mahoney Cc: "Vladimir V. Saveliev" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/reiserfs/super.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index edfd74f..b82897a 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -145,7 +145,7 @@ static int finish_unfinished(struct super_block *s) { INITIALIZE_PATH(path); struct cpu_key max_cpu_key, obj_key; - struct reiserfs_key save_link_key; + struct reiserfs_key save_link_key, last_inode_key; int retval = 0; struct item_head *ih; struct buffer_head *bh; @@ -166,6 +166,8 @@ static int finish_unfinished(struct super_block *s) set_cpu_key_k_offset(&max_cpu_key, ~0U); max_cpu_key.key_length = 3; + memset(&last_inode_key, 0, sizeof(last_inode_key)); + #ifdef CONFIG_QUOTA /* Needed for iput() to work correctly and not trash data */ if (s->s_flags & MS_ACTIVE) { @@ -278,8 +280,18 @@ static int finish_unfinished(struct super_block *s) REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; /* not completed unlink (rmdir) found */ reiserfs_info(s, "Removing %k..", INODE_PKEY(inode)); - /* removal gets completed in iput */ - retval = 0; + if (memcmp(&last_inode_key, INODE_PKEY(inode), + sizeof(last_inode_key))){ + last_inode_key = *INODE_PKEY(inode); + /* removal gets completed in iput */ + retval = 0; + } else { + reiserfs_warning(s, "Dead loop in " + "finish_unfinished detected, " + "just remove save link\n"); + retval = remove_save_link_only(s, + &save_link_key, 0); + } } iput(inode); -- 2.7.4