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58a8fe7cb0
Current gcc set a limit for each stack and complain if this limit is not
followed. JFSS2 in build_xattr function currently exceed the limit by
allocating a massive array of struct of 128 elements. Introduce a
pending patch that allocate this temp array dynamically fixing the
compilation warning:
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 | }
| ^
Affecting many target that require jffs2 support.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
122 lines
4.0 KiB
Diff
122 lines
4.0 KiB
Diff
From eee53f6eb7561f516b9c4bac829ce31c48096130 Mon Sep 17 00:00:00 2001
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From: Fabian Frederick <fabf@skynet.be>
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Date: Tue, 9 May 2017 22:30:03 +0200
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Subject: [PATCH] jffs2: reduce stack usage in jffs2_build_xattr_subsystem()
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Use kcalloc() for allocation/flush of 128 pointers table to
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reduce stack usage.
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Function now returns -ENOMEM or 0 on success.
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stackusage
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Before:
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./fs/jffs2/xattr.c:775 jffs2_build_xattr_subsystem 1208
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dynamic,bounded
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After:
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./fs/jffs2/xattr.c:775 jffs2_build_xattr_subsystem 192
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dynamic,bounded
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Also update definition when CONFIG_JFFS2_FS_XATTR is not enabled
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Tested with an MTD mount point and some user set/getfattr.
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Many current target on OpenWRT also suffer from a compilation warning
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(that become an error with CONFIG_WERROR) with the following output:
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fs/jffs2/xattr.c: In function 'jffs2_build_xattr_subsystem':
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fs/jffs2/xattr.c:887:1: error: the frame size of 1088 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
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887 | }
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| ^
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Using dynamic allocation fix this compilation warning.
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Fixes: c9f700f840bd ("[JFFS2][XATTR] using 'delete marker' for xdatum/xref deletion")
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Reported-by: Tim Gardner <tim.gardner@canonical.com>
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Reported-by: kernel test robot <lkp@intel.com>
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Reported-by: Ron Economos <re@w6rz.net>
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Reported-by: Nathan Chancellor <nathan@kernel.org>
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Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
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Signed-off-by: Fabian Frederick <fabf@skynet.be>
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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Cc: stable@vger.kernel.org
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---
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fs/jffs2/build.c | 5 ++++-
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fs/jffs2/xattr.c | 13 +++++++++----
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fs/jffs2/xattr.h | 4 ++--
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3 files changed, 15 insertions(+), 7 deletions(-)
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--- a/fs/jffs2/build.c
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+++ b/fs/jffs2/build.c
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@@ -211,7 +211,10 @@ static int jffs2_build_filesystem(struct
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ic->scan_dents = NULL;
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cond_resched();
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}
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- jffs2_build_xattr_subsystem(c);
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+ ret = jffs2_build_xattr_subsystem(c);
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+ if (ret)
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+ goto exit;
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+
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c->flags &= ~JFFS2_SB_FLAG_BUILDING;
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dbg_fsbuild("FS build complete\n");
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--- a/fs/jffs2/xattr.c
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+++ b/fs/jffs2/xattr.c
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@@ -772,10 +772,10 @@ void jffs2_clear_xattr_subsystem(struct
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}
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#define XREF_TMPHASH_SIZE (128)
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-void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
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+int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
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{
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struct jffs2_xattr_ref *ref, *_ref;
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- struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
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+ struct jffs2_xattr_ref **xref_tmphash;
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struct jffs2_xattr_datum *xd, *_xd;
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struct jffs2_inode_cache *ic;
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struct jffs2_raw_node_ref *raw;
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@@ -784,9 +784,12 @@ void jffs2_build_xattr_subsystem(struct
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BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
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+ xref_tmphash = kcalloc(XREF_TMPHASH_SIZE,
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+ sizeof(struct jffs2_xattr_ref *), GFP_KERNEL);
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+ if (!xref_tmphash)
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+ return -ENOMEM;
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+
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/* Phase.1 : Merge same xref */
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- for (i=0; i < XREF_TMPHASH_SIZE; i++)
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- xref_tmphash[i] = NULL;
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for (ref=c->xref_temp; ref; ref=_ref) {
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struct jffs2_xattr_ref *tmp;
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@@ -884,6 +887,8 @@ void jffs2_build_xattr_subsystem(struct
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"%u of xref (%u dead, %u orphan) found.\n",
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xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
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xref_count, xref_dead_count, xref_orphan_count);
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+ kfree(xref_tmphash);
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+ return 0;
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}
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struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
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--- a/fs/jffs2/xattr.h
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+++ b/fs/jffs2/xattr.h
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@@ -71,7 +71,7 @@ static inline int is_xattr_ref_dead(stru
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#ifdef CONFIG_JFFS2_FS_XATTR
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extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
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-extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
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+extern int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
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extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
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extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
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@@ -103,7 +103,7 @@ extern ssize_t jffs2_listxattr(struct de
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#else
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#define jffs2_init_xattr_subsystem(c)
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-#define jffs2_build_xattr_subsystem(c)
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+#define jffs2_build_xattr_subsystem(c) (0)
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#define jffs2_clear_xattr_subsystem(c)
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#define jffs2_xattr_do_crccheck_inode(c, ic)
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