[PATCH 062/102] xfs: trace xfs_name strings correctly

Dave Chinner
2012-08-23T05:04:09Z

From: Christoph Hellwig <hch@infradead.org>

Upstream commit: f616137519feb17b849894fcbe634a021d3fa7db

Strings store in an xfs_name structure are often not NUL terminated,
print them using the correct printf specifiers that make use of the
string length store in the xfs_name structure.

Reported-by: Brian Candler <B.Candler@pobox.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
---
fs/xfs/linux-2.6/xfs_trace.h | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_trace.h b/fs/xfs/linux-2.6/xfs_trace.h
index 3509faf..4e544af 100644
--- a/fs/xfs/linux-2.6/xfs_trace.h
+++ b/fs/xfs/linux-2.6/xfs_trace.h
@@ -628,16 +628,19 @@ DECLARE_EVENT_CLASS(xfs_namespace_class,
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_ino_t, dp_ino)
+ __field(int, namelen)
__dynamic_array(char, name, name->len)
),
TP_fast_assign(
__entry->dev = VFS_I(dp)->i_sb->s_dev;
__entry->dp_ino = dp->i_ino;
+ __entry->namelen = name->len;
memcpy(__get_str(name), name->name, name->len);
),
- TP_printk("dev %d:%d dp ino 0x%llx name %s",
+ TP_printk("dev %d:%d dp ino 0x%llx name %.*s",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->dp_ino,
+ __entry->namelen,
__get_str(name))
)

@@ -659,6 +662,8 @@ TRACE_EVENT(xfs_rename,
__field(dev_t, dev)
__field(xfs_ino_t, src_dp_ino)
__field(xfs_ino_t, target_dp_ino)
+ __field(int, src_namelen)
+ __field(int, target_namelen)
__dynamic_array(char, src_name, src_name->len)
__dynamic_array(char, target_name, target_name->len)
),
@@ -666,15 +671,20 @@ TRACE_EVENT(xfs_rename,
__entry->dev = VFS_I(src_dp)->i_sb->s_dev;
__entry->src_dp_ino = src_dp->i_ino;
__entry->target_dp_ino = target_dp->i_ino;
+ __entry->src_namelen = src_name->len;
+ __entry->target_namelen = target_name->len;
memcpy(__get_str(src_name), src_name->name, src_name->len);
- memcpy(__get_str(target_name), target_name->name, target_name->len);
+ memcpy(__get_str(target_name), target_name->name,
+ target_name->len);
),
TP_printk("dev %d:%d src dp ino 0x%llx target dp ino 0x%llx"
- " src name %s target name %s",
+ " src name %.*s target name %.*s",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->src_dp_ino,
__entry->target_dp_ino,
+ __entry->src_namelen,
__get_str(src_name),
+ __entry->target_namelen,
__get_str(target_name))
)