From 43e07f6b721869c2de15ae2b8df31f18d421a28f Mon Sep 17 00:00:00 2001 From: Jie Liu Date: Fri, 28 Jun 2013 09:51:07 +1000 Subject: [PATCH] ocfs2: rework transaction rollback in ocfs2_relink_block_group() In ocfs2_relink_block_group(), we roll back all those changes if notify intent to modify buffers for metadata update failed even if the relevant buffer has not yet been modified/got dirty at that point, that are not quite right because of: - None buffer has been modified/dirty if failed to call ocfs2_journal_access_gd() against the previous block group buffer - Only the previous block group buffer has got dirty if failed to call ocfs2_journal_access_gd() against the block group buffer - There is no need to roll back the change for file entry buffer at all Those problems will not cause anything wrong but unnecessary. This patch fix them and kill the useless bg_ptr variable as well. Signed-off-by: Jie Liu Cc: Younger Liu Cc: Sunil Mushran Cc: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton --- fs/ocfs2/suballoc.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c index b7e74b580c0f..101d16d78162 100644 --- a/fs/ocfs2/suballoc.c +++ b/fs/ocfs2/suballoc.c @@ -1422,7 +1422,7 @@ static int ocfs2_relink_block_group(handle_t *handle, int status; /* there is a really tiny chance the journal calls could fail, * but we wouldn't want inconsistent blocks in *any* case. */ - u64 fe_ptr, bg_ptr, prev_bg_ptr; + u64 bg_ptr, prev_bg_ptr; struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data; @@ -1437,7 +1437,6 @@ static int ocfs2_relink_block_group(handle_t *handle, (unsigned long long)le64_to_cpu(bg->bg_blkno), (unsigned long long)le64_to_cpu(prev_bg->bg_blkno)); - fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno); bg_ptr = le64_to_cpu(bg->bg_next_group); prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group); @@ -1446,7 +1445,7 @@ static int ocfs2_relink_block_group(handle_t *handle, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); - goto out_rollback; + goto out; } prev_bg->bg_next_group = bg->bg_next_group; @@ -1456,7 +1455,7 @@ static int ocfs2_relink_block_group(handle_t *handle, bg_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); - goto out_rollback; + goto out_rollback_prev_bg; } bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno; @@ -1466,21 +1465,21 @@ static int ocfs2_relink_block_group(handle_t *handle, fe_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); - goto out_rollback; + goto out_rollback_bg; } fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno; ocfs2_journal_dirty(handle, fe_bh); -out_rollback: - if (status < 0) { - fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr); - bg->bg_next_group = cpu_to_le64(bg_ptr); - prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr); - } +out: + return status; - if (status) - mlog_errno(status); +out_rollback_bg: + bg->bg_next_group = cpu_to_le64(bg_ptr); +out_rollback_prev_bg: + prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr); + + mlog_errno(status); return status; } -- 2.39.5