lwn.git/fs/jffs2/background.c, branch v4.3.2

signals: jffs2: fix the wrong usage of disallow_signal()

2014-06-06T23:08:11+00:00

jffs2_garbage_collect_thread() does disallow_signal(SIGHUP) around jffs2_garbage_collect_pass() and the comment says "We don't want SIGHUP to interrupt us". But disallow_signal() can't ensure that jffs2_garbage_collect_pass() won't be interrupted by SIGHUP, the problem is that SIGHUP can be already pending when disallow_signal() is called, and in this case any interruptible sleep won't block. Note: this is in fact because disallow_signal() is buggy and should be fixed, see the next changes. But there is another reason why disallow_signal() is wrong: SIG_IGN set by disallow_signal() silently discards any SIGHUP which can be sent before the next allow_signal(SIGHUP). Change this code to use sigprocmask(SIG_UNBLOCK/SIG_BLOCK, SIGHUP). This even matches the old (and wrong) semantics allow/disallow had when this logic was written. Signed-off-by: Oleg Nesterov Cc: Peter Zijlstra Cc: Al Viro Cc: David Woodhouse Cc: Frederic Weisbecker Cc: Geert Uytterhoeven Cc: Ingo Molnar Cc: Mathieu Desnoyers Cc: Richard Weinberger Cc: Steven Rostedt Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

jffs2: Use pr_fmt and remove jffs: from formats

2012-03-26T23:40:19+00:00

Use pr_fmt to prefix KBUILD_MODNAME to appropriate logging messages. Remove now unnecessary internal prefixes from formats. Signed-off-by: Joe Perches Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse

jffs2: Convert printks to pr_

2012-03-26T23:39:40+00:00

Use the more current logging style. Coalesce formats, align arguments. Convert uses of embedded function names to %s, __func__. A couple of long line checkpatch errors I don't care about exist. Signed-off-by: Joe Perches Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse

jffs2: Convert most D1/D2 macros to jffs2_dbg

2012-03-26T23:39:24+00:00

D1 and D2 macros are mostly uses to emit debugging messages. Convert the logging uses of D1 & D2 to jffs2_dbg(level, fmt, ...) to be a bit more consistent style with the rest of the kernel. All jffs2_dbg output is now at KERN_DEBUG where some of the previous uses were emitted at various KERN_s. Signed-off-by: Joe Perches Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse

jffs2: Update copyright notices

2010-08-08T13:15:22+00:00

Signed-off-by: David Woodhouse

jffs2: Require jffs2_garbage_collect_trigger() to be called with lock held

2010-05-19T16:10:22+00:00

We're about to call this from a bunch of places which already hold c->erase_completion_lock, so add an assertion and change its existing callers to do the same. Signed-off-by: David Woodhouse

jffs2: move jffs2_gcd_mtd threads to the new kthread API

2009-09-04T08:53:35+00:00

Move the jffs2 garbage collecting thread to the new kthread API. Signed-off-by: Gerard Lledo Signed-off-by: Andrew Morton Signed-off-by: David Woodhouse

[JFFS2] force the jffs2 GC daemon to behave a bit better

2009-02-14T08:59:04+00:00

I've noticed some pretty poor behavior on OLPC machines after bootup, when gdm/X are starting. The GCD monopolizes the scheduler (which in turns means it gets to do more nand i/o), which results in processes taking much much longer than they should to start. As an example, on an OLPC machine going from OFW to a usable X (via auto-login gdm) takes 2m 30s. The majority of this time is consumed by the switch into graphical mode. With this patch, we cut a full 60s off of bootup time. After bootup, things are much snappier as well. Note that we have seen a CRC node error with this patch that causes the machine to fail to boot, but we've also seen that problem without this patch. Signed-off-by: Andres Salomon Signed-off-by: Andrew Morton Signed-off-by: David Woodhouse

[JFFS2] Fix lack of locking in thread_should_wake()

2008-10-31T14:52:24+00:00

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 Cc: stable@kernel.org

Freezer: Fix JFFS2 garbage collector freezing issue (rev. 2)

2007-12-04T06:35:41+00:00

Fix breakage caused by commit d5d8c5976d6adeddb8208c240460411e2198b393 "freezer: do not send signals to kernel threads" in jffs2_garbage_collect_thread() that assumed it would be sent signals by the freezer. Signed-off-by: Rafael J. Wysocki Cc: David Woodhouse Cc: Pete MacKay Signed-off-by: Len Brown