mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
122 lines
4.0 KiB
Diff
122 lines
4.0 KiB
Diff
|
From eee53f6eb7561f516b9c4bac829ce31c48096130 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Fabian Frederick <fabf@skynet.be>
|
||
|
|
Date: Tue, 9 May 2017 22:30:03 +0200
|
||
|
|
Subject: [PATCH] jffs2: reduce stack usage in jffs2_build_xattr_subsystem()
|
||
|
|
|
||
|
|
Use kcalloc() for allocation/flush of 128 pointers table to
|
||
|
|
reduce stack usage.
|
||
|
|
|
||
|
|
Function now returns -ENOMEM or 0 on success.
|
||
|
|
|
||
|
|
stackusage
|
||
|
|
Before:
|
||
|
|
./fs/jffs2/xattr.c:775 jffs2_build_xattr_subsystem 1208
|
||
|
|
dynamic,bounded
|
||
|
|
|
||
|
|
After:
|
||
|
|
./fs/jffs2/xattr.c:775 jffs2_build_xattr_subsystem 192
|
||
|
|
dynamic,bounded
|
||
|
|
|
||
|
|
Also update definition when CONFIG_JFFS2_FS_XATTR is not enabled
|
||
|
|
|
||
|
|
Tested with an MTD mount point and some user set/getfattr.
|
||
|
|
|
||
|
|
Many current target on OpenWRT also suffer from a compilation warning
|
||
|
|
(that become an error with CONFIG_WERROR) with the following output:
|
||
|
|
|
||
|
|
fs/jffs2/xattr.c: In function 'jffs2_build_xattr_subsystem':
|
||
|
|
fs/jffs2/xattr.c:887:1: error: the frame size of 1088 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
|
||
|
|
887 | }
|
||
|
|
| ^
|
||
|
|
|
||
|
|
Using dynamic allocation fix this compilation warning.
|
||
|
|
|
||
|
|
Fixes: c9f700f840bd ("[JFFS2][XATTR] using 'delete marker' for xdatum/xref deletion")
|
||
|
|
Reported-by: Tim Gardner <tim.gardner@canonical.com>
|
||
|
|
Reported-by: kernel test robot <lkp@intel.com>
|
||
|
|
Reported-by: Ron Economos <re@w6rz.net>
|
||
|
|
Reported-by: Nathan Chancellor <nathan@kernel.org>
|
||
|
|
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
|
||
|
|
Signed-off-by: Fabian Frederick <fabf@skynet.be>
|
||
|
|
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
|
||
|
|
Cc: stable@vger.kernel.org
|
||
|
|
---
|
||
|
|
fs/jffs2/build.c | 5 ++++-
|
||
|
|
fs/jffs2/xattr.c | 13 +++++++++----
|
||
|
|
fs/jffs2/xattr.h | 4 ++--
|
||
|
|
3 files changed, 15 insertions(+), 7 deletions(-)
|
||
|
|
|
||
|
|
--- a/fs/jffs2/build.c
|
||
|
|
+++ b/fs/jffs2/build.c
|
||
|
|
@@ -211,7 +211,10 @@ static int jffs2_build_filesystem(struct
|
||
|
|
ic->scan_dents = NULL;
|
||
|
|
cond_resched();
|
||
|
|
}
|
||
|
|
- jffs2_build_xattr_subsystem(c);
|
||
|
|
+ ret = jffs2_build_xattr_subsystem(c);
|
||
|
|
+ if (ret)
|
||
|
|
+ goto exit;
|
||
|
|
+
|
||
|
|
c->flags &= ~JFFS2_SB_FLAG_BUILDING;
|
||
|
|
|
||
|
|
dbg_fsbuild("FS build complete\n");
|
||
|
|
--- a/fs/jffs2/xattr.c
|
||
|
|
+++ b/fs/jffs2/xattr.c
|
||
|
|
@@ -772,10 +772,10 @@ void jffs2_clear_xattr_subsystem(struct
|
||
|
|
}
|
||
|
|
|
||
|
|
#define XREF_TMPHASH_SIZE (128)
|
||
|
|
-void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
|
||
|
|
+int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
|
||
|
|
{
|
||
|
|
struct jffs2_xattr_ref *ref, *_ref;
|
||
|
|
- struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
|
||
|
|
+ struct jffs2_xattr_ref **xref_tmphash;
|
||
|
|
struct jffs2_xattr_datum *xd, *_xd;
|
||
|
|
struct jffs2_inode_cache *ic;
|
||
|
|
struct jffs2_raw_node_ref *raw;
|
||
|
|
@@ -784,9 +784,12 @@ void jffs2_build_xattr_subsystem(struct
|
||
|
|
|
||
|
|
BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
|
||
|
|
|
||
|
|
+ xref_tmphash = kcalloc(XREF_TMPHASH_SIZE,
|
||
|
|
+ sizeof(struct jffs2_xattr_ref *), GFP_KERNEL);
|
||
|
|
+ if (!xref_tmphash)
|
||
|
|
+ return -ENOMEM;
|
||
|
|
+
|
||
|
|
/* Phase.1 : Merge same xref */
|
||
|
|
- for (i=0; i < XREF_TMPHASH_SIZE; i++)
|
||
|
|
- xref_tmphash[i] = NULL;
|
||
|
|
for (ref=c->xref_temp; ref; ref=_ref) {
|
||
|
|
struct jffs2_xattr_ref *tmp;
|
||
|
|
|
||
|
|
@@ -884,6 +887,8 @@ void jffs2_build_xattr_subsystem(struct
|
||
|
|
"%u of xref (%u dead, %u orphan) found.\n",
|
||
|
|
xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
|
||
|
|
xref_count, xref_dead_count, xref_orphan_count);
|
||
|
|
+ kfree(xref_tmphash);
|
||
|
|
+ return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
|
||
|
|
--- a/fs/jffs2/xattr.h
|
||
|
|
+++ b/fs/jffs2/xattr.h
|
||
|
|
@@ -71,7 +71,7 @@ static inline int is_xattr_ref_dead(stru
|
||
|
|
#ifdef CONFIG_JFFS2_FS_XATTR
|
||
|
|
|
||
|
|
extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
|
||
|
|
-extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
|
||
|
|
+extern int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
|
||
|
|
extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
|
||
|
|
|
||
|
|
extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
|
||
|
|
@@ -103,7 +103,7 @@ extern ssize_t jffs2_listxattr(struct de
|
||
|
|
#else
|
||
|
|
|
||
|
|
#define jffs2_init_xattr_subsystem(c)
|
||
|
|
-#define jffs2_build_xattr_subsystem(c)
|
||
|
|
+#define jffs2_build_xattr_subsystem(c) (0)
|
||
|
|
#define jffs2_clear_xattr_subsystem(c)
|
||
|
|
|
||
|
|
#define jffs2_xattr_do_crccheck_inode(c, ic)
|