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authorBob Peterson <rpeterso@redhat.com>2017-03-16 22:29:13 +0300
committerBob Peterson <rpeterso@redhat.com>2017-03-16 22:29:13 +0300
commitcc963a11b67b796c25c5b827b25d2bcc92ce1779 (patch)
treee250b4523abe878bfc06d6d10fc76697b883551b /fs/gfs2/inode.c
parent972b044eeca582ef173d063773e292bd9e8633d6 (diff)
downloadlinux-cc963a11b67b796c25c5b827b25d2bcc92ce1779.tar.xz
GFS2: Temporarily zero i_no_addr when creating a dinode
Before this patch i_no_addr was not initialized until after the return from allocating its block. That meant the i_no_addr was temporarily uninitialized storage. Ordinarily that's not a concern, but if inplace_reserve can't find space, it can call try_rgrp_unlink which references i_no_addr as a block to avoid. That can result in unpredictable behavior. More importantly, the trace point in gfs2_alloc_blocks references ip->i_no_addr before it is set, which is misleading when reading the kernel traces. This patch makes it look like the new dinode block was assigned in the name of inode 0 rather than a random inode that's completely unrelated. Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2/inode.c')
-rw-r--r--fs/gfs2/inode.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index e279c3ce27be..4f405d43a86b 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -667,6 +667,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
ip->i_height = 0;
ip->i_depth = 0;
ip->i_entries = 0;
+ ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
switch(mode & S_IFMT) {
case S_IFREG: