From bcb7267a915d800954e2412f44224a0b458329a8 Mon Sep 17 00:00:00 2001 From: Larry Chen Date: Fri, 2 Nov 2018 15:48:27 -0700 Subject: [PATCH] ocfs2: fix clusters leak in ocfs2_defrag_extent() [ Upstream commit 6194ae4242dec0c9d604bc05df83aa9260a899e4 ] ocfs2_defrag_extent() might leak allocated clusters. When the file system has insufficient space, the number of claimed clusters might be less than the caller wants. If that happens, the original code might directly commit the transaction without returning clusters. This patch is based on code in ocfs2_add_clusters_in_btree(). [akpm@linux-foundation.org: include localalloc.h, reduce scope of data_ac] Link: http://lkml.kernel.org/r/20180904041621.16874-3-lchen@suse.com Signed-off-by: Larry Chen Reviewed-by: Andrew Morton Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Joseph Qi Cc: Changwei Ge Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/ocfs2/move_extents.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c index c179afd..afaa044 100644 --- a/fs/ocfs2/move_extents.c +++ b/fs/ocfs2/move_extents.c @@ -25,6 +25,7 @@ #include "ocfs2_ioctl.h" #include "alloc.h" +#include "localalloc.h" #include "aops.h" #include "dlmglue.h" #include "extent_map.h" @@ -222,6 +223,7 @@ static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context, struct ocfs2_refcount_tree *ref_tree = NULL; u32 new_phys_cpos, new_len; u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); + int need_free = 0; if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) { @@ -315,6 +317,7 @@ static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context, if (!partial) { context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE; ret = -ENOSPC; + need_free = 1; goto out_commit; } } @@ -339,6 +342,20 @@ static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context, mlog_errno(ret); out_commit: + if (need_free && context->data_ac) { + struct ocfs2_alloc_context *data_ac = context->data_ac; + + if (context->data_ac->ac_which == OCFS2_AC_USE_LOCAL) + ocfs2_free_local_alloc_bits(osb, handle, data_ac, + new_phys_cpos, new_len); + else + ocfs2_free_clusters(handle, + data_ac->ac_inode, + data_ac->ac_bh, + ocfs2_clusters_to_blocks(osb->sb, new_phys_cpos), + new_len); + } + ocfs2_commit_trans(osb, handle); out_unlock_mutex: -- 2.7.4