From f04de505e3fa322728d1a851e08bf7060b117743 Mon Sep 17 00:00:00 2001
From: Steve Glendinning <steve.glendinning@smsc.com>
Date: Tue, 21 Oct 2008 13:25:51 +0100
Subject: [JFFS2] Fix build failure with !CONFIG_JFFS2_FS_WRITEBUFFER
Build failure introduced by 5bf1723723487ddb0b9c9641b6559da96b27cc93
[JFFS2] Write buffer offset adjustment for NOR-ECC (Sibley) flash
Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---
fs/jffs2/nodemgmt.c | 2 ++
1 file changed, 2 insertions(+)
(limited to 'fs/jffs2')
diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index 0875b60b4bf..21a052915aa 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -261,9 +261,11 @@ static int jffs2_find_nextblock(struct jffs2_sb_info *c)
jffs2_sum_reset_collected(c->summary); /* reset collected summary */
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
/* adjust write buffer offset, else we get a non contiguous write bug */
if (!(c->wbuf_ofs % c->sector_size) && !c->wbuf_len)
c->wbuf_ofs = 0xffffffff;
+#endif
D1(printk(KERN_DEBUG "jffs2_find_nextblock(): new nextblock = 0x%08x\n", c->nextblock->offset));
--
cgit
From b27cf88e9592953ae292d05324887f2f44979433 Mon Sep 17 00:00:00 2001
From: David Woodhouse <David.Woodhouse@intel.com>
Date: Fri, 31 Oct 2008 14:52:24 +0000
Subject: [JFFS2] Fix lack of locking in thread_should_wake()
The thread_should_wake() function trawls through the list of 'very
dirty' eraseblocks, determining whether the background GC thread should
wake. Doing this without holding the appropriate locks is a bad idea.
OLPC Trac #8615
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org
---
fs/jffs2/background.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
(limited to 'fs/jffs2')
diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index 8adebd3e43c..3cceef4ad2b 100644
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -85,15 +85,15 @@ static int jffs2_garbage_collect_thread(void *_c)
for (;;) {
allow_signal(SIGHUP);
again:
+ spin_lock(&c->erase_completion_lock);
if (!jffs2_thread_should_wake(c)) {
set_current_state (TASK_INTERRUPTIBLE);
+ spin_unlock(&c->erase_completion_lock);
D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n"));
- /* Yes, there's a race here; we checked jffs2_thread_should_wake()
- before setting current->state to TASK_INTERRUPTIBLE. But it doesn't
- matter - We don't care if we miss a wakeup, because the GC thread
- is only an optimisation anyway. */
schedule();
- }
+ } else
+ spin_unlock(&c->erase_completion_lock);
+
/* This thread is purely an optimisation. But if it runs when
other things could be running, it actually makes things a
--
cgit
From dc8a0843a435b2c0891e7eaea64faaf1ebec9b11 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Date: Wed, 5 Nov 2008 23:21:16 +0100
Subject: [JFFS2] fix race condition in jffs2_lzo_compress()
deflate_mutex protects the globals lzo_mem and lzo_compress_buf. However,
jffs2_lzo_compress() unlocks deflate_mutex _before_ it has copied out the
compressed data from lzo_compress_buf. Correct this by moving the mutex
unlock after the copy.
In addition, document what deflate_mutex actually protects.
Cc: stable@kernel.org
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Richard Purdie <rpurdie@openedhand.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---
fs/jffs2/compr_lzo.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
(limited to 'fs/jffs2')
diff --git a/fs/jffs2/compr_lzo.c b/fs/jffs2/compr_lzo.c
index 47b045797e4..90cb60d0978 100644
--- a/fs/jffs2/compr_lzo.c
+++ b/fs/jffs2/compr_lzo.c
@@ -19,7 +19,7 @@
static void *lzo_mem;
static void *lzo_compress_buf;
-static DEFINE_MUTEX(deflate_mutex);
+static DEFINE_MUTEX(deflate_mutex); /* for lzo_mem and lzo_compress_buf */
static void free_workspace(void)
{
@@ -49,18 +49,21 @@ static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out,
mutex_lock(&deflate_mutex);
ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem);
- mutex_unlock(&deflate_mutex);
-
if (ret != LZO_E_OK)
- return -1;
+ goto fail;
if (compress_size > *dstlen)
- return -1;
+ goto fail;
memcpy(cpage_out, lzo_compress_buf, compress_size);
- *dstlen = compress_size;
+ mutex_unlock(&deflate_mutex);
+ *dstlen = compress_size;
return 0;
+
+ fail:
+ mutex_unlock(&deflate_mutex);
+ return -1;
}
static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
--
cgit