The patch titled
Subject: ocfs2/dlm: fix memory leak of dlm_debug_ctxt
has been added to the -mm tree. Its filename is
ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Joseph Qi <joseph.qi@xxxxxxxxxx>
Subject: ocfs2/dlm: fix memory leak of dlm_debug_ctxt
dlm_debug_ctxt->debug_refcnt is initialized to 1 and then increased to 2
by dlm_debug_get in dlm_debug_init. But dlm_debug_put is called only
once in dlm_debug_shutdown during unregister dlm, which leads to
dlm_debug_ctxt leaked.
Link: http://lkml.kernel.org/r/577BB755.4030900@xxxxxxxxxx
Signed-off-by: Joseph Qi <joseph.qi@xxxxxxxxxx>
Reviewed-by: Jiufei Xue <xuejiufei@xxxxxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/dlm/dlmdebug.c | 26 ++------------------------
fs/ocfs2/dlm/dlmdebug.h | 1 -
2 files changed, 2 insertions(+), 25 deletions(-)
diff -puN fs/ocfs2/dlm/dlmdebug.c~ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt fs/ocfs2/dlm/dlmdebug.c
--- a/fs/ocfs2/dlm/dlmdebug.c~ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt
+++ a/fs/ocfs2/dlm/dlmdebug.c
@@ -347,26 +347,6 @@ static struct dentry *dlm_debugfs_root;
#define DLM_DEBUGFS_PURGE_LIST "purge_list"
/* begin - utils funcs */
-static void dlm_debug_free(struct kref *kref)
-{
- struct dlm_debug_ctxt *dc;
-
- dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
-
- kfree(dc);
-}
-
-static void dlm_debug_put(struct dlm_debug_ctxt *dc)
-{
- if (dc)
- kref_put(&dc->debug_refcnt, dlm_debug_free);
-}
-
-static void dlm_debug_get(struct dlm_debug_ctxt *dc)
-{
- kref_get(&dc->debug_refcnt);
-}
-
static int debug_release(struct inode *inode, struct file *file)
{
free_page((unsigned long)file->private_data);
@@ -932,11 +912,9 @@ int dlm_debug_init(struct dlm_ctxt *dlm)
goto bail;
}
- dlm_debug_get(dc);
return 0;
bail:
- dlm_debug_shutdown(dlm);
return -ENOMEM;
}
@@ -949,7 +927,8 @@ void dlm_debug_shutdown(struct dlm_ctxt
debugfs_remove(dc->debug_mle_dentry);
debugfs_remove(dc->debug_lockres_dentry);
debugfs_remove(dc->debug_state_dentry);
- dlm_debug_put(dc);
+ kfree(dc);
+ dc = NULL;
}
}
@@ -969,7 +948,6 @@ int dlm_create_debugfs_subroot(struct dl
mlog_errno(-ENOMEM);
goto bail;
}
- kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
return 0;
bail:
diff -puN fs/ocfs2/dlm/dlmdebug.h~ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt fs/ocfs2/dlm/dlmdebug.h
--- a/fs/ocfs2/dlm/dlmdebug.h~ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt
+++ a/fs/ocfs2/dlm/dlmdebug.h
@@ -30,7 +30,6 @@ void dlm_print_one_mle(struct dlm_master
#ifdef CONFIG_DEBUG_FS
struct dlm_debug_ctxt {
- struct kref debug_refcnt;
struct dentry *debug_state_dentry;
struct dentry *debug_lockres_dentry;
struct dentry *debug_mle_dentry;
_
Patches currently in -mm which might be from joseph.qi@xxxxxxxxxx are
ocfs2-cleanup-unneeded-goto-in-ocfs2_create_new_inode_locks.patch
ocfs2-dlm-fix-memory-leak-of-dlm_debug_ctxt.patch
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