diff options
author | Christoph Lameter <christoph@lameter.com> | 2005-06-24 23:13:50 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-25 17:10:13 -0700 |
commit | 3e1d1d28d99dabe63c64f7f40f1ca1d646de1f73 (patch) | |
tree | d1e7c1e2e8902072042aefc3a7976b271cf76021 /fs | |
parent | b3e112bcc19abd8e9657dca34a87316786e096f3 (diff) | |
download | linux-stable-3e1d1d28d99dabe63c64f7f40f1ca1d646de1f73.tar.gz linux-stable-3e1d1d28d99dabe63c64f7f40f1ca1d646de1f73.tar.bz2 linux-stable-3e1d1d28d99dabe63c64f7f40f1ca1d646de1f73.zip |
[PATCH] Cleanup patch for process freezing
1. Establish a simple API for process freezing defined in linux/include/sched.h:
frozen(process) Check for frozen process
freezing(process) Check if a process is being frozen
freeze(process) Tell a process to freeze (go to refrigerator)
thaw_process(process) Restart process
frozen_process(process) Process is frozen now
2. Remove all references to PF_FREEZE and PF_FROZEN from all
kernel sources except sched.h
3. Fix numerous locations where try_to_freeze is manually done by a driver
4. Remove the argument that is no longer necessary from two function calls.
5. Some whitespace cleanup
6. Clear potential race in refrigerator (provides an open window of PF_FREEZE
cleared before setting PF_FROZEN, recalc_sigpending does not check
PF_FROZEN).
This patch does not address the problem of freeze_processes() violating the rule
that a task may only modify its own flags by setting PF_FREEZE. This is not clean
in an SMP environment. freeze(process) is therefore not SMP safe!
Signed-off-by: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/afs/kafsasyncd.c | 2 | ||||
-rw-r--r-- | fs/afs/kafstimod.c | 2 | ||||
-rw-r--r-- | fs/jbd/journal.c | 4 | ||||
-rw-r--r-- | fs/jfs/jfs_logmgr.c | 4 | ||||
-rw-r--r-- | fs/jfs/jfs_txnmgr.c | 8 | ||||
-rw-r--r-- | fs/lockd/clntproc.c | 2 | ||||
-rw-r--r-- | fs/xfs/linux-2.6/xfs_buf.c | 4 | ||||
-rw-r--r-- | fs/xfs/linux-2.6/xfs_super.c | 2 |
8 files changed, 14 insertions, 14 deletions
diff --git a/fs/afs/kafsasyncd.c b/fs/afs/kafsasyncd.c index 6fc88ae8ad94..7ac07d0d47b9 100644 --- a/fs/afs/kafsasyncd.c +++ b/fs/afs/kafsasyncd.c @@ -116,7 +116,7 @@ static int kafsasyncd(void *arg) remove_wait_queue(&kafsasyncd_sleepq, &myself); set_current_state(TASK_RUNNING); - try_to_freeze(PF_FREEZE); + try_to_freeze(); /* discard pending signals */ afs_discard_my_signals(); diff --git a/fs/afs/kafstimod.c b/fs/afs/kafstimod.c index 86e710dd057e..65bc05ab8182 100644 --- a/fs/afs/kafstimod.c +++ b/fs/afs/kafstimod.c @@ -91,7 +91,7 @@ static int kafstimod(void *arg) complete_and_exit(&kafstimod_dead, 0); } - try_to_freeze(PF_FREEZE); + try_to_freeze(); /* discard pending signals */ afs_discard_my_signals(); diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c index 1e6f2e2ad4a3..5e7b43949517 100644 --- a/fs/jbd/journal.c +++ b/fs/jbd/journal.c @@ -167,7 +167,7 @@ loop: } wake_up(&journal->j_wait_done_commit); - if (current->flags & PF_FREEZE) { + if (freezing(current)) { /* * The simpler the better. Flushing journal isn't a * good idea, because that depends on threads that may @@ -175,7 +175,7 @@ loop: */ jbd_debug(1, "Now suspending kjournald\n"); spin_unlock(&journal->j_state_lock); - refrigerator(PF_FREEZE); + refrigerator(); spin_lock(&journal->j_state_lock); } else { /* diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c index 7c8387ed4192..79d07624bfe1 100644 --- a/fs/jfs/jfs_logmgr.c +++ b/fs/jfs/jfs_logmgr.c @@ -2359,9 +2359,9 @@ int jfsIOWait(void *arg) lbmStartIO(bp); spin_lock_irq(&log_redrive_lock); } - if (current->flags & PF_FREEZE) { + if (freezing(current)) { spin_unlock_irq(&log_redrive_lock); - refrigerator(PF_FREEZE); + refrigerator(); } else { add_wait_queue(&jfs_IO_thread_wait, &wq); set_current_state(TASK_INTERRUPTIBLE); diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c index 8cbaaff1d5fa..121c981ff453 100644 --- a/fs/jfs/jfs_txnmgr.c +++ b/fs/jfs/jfs_txnmgr.c @@ -2788,9 +2788,9 @@ int jfs_lazycommit(void *arg) /* In case a wakeup came while all threads were active */ jfs_commit_thread_waking = 0; - if (current->flags & PF_FREEZE) { + if (freezing(current)) { LAZY_UNLOCK(flags); - refrigerator(PF_FREEZE); + refrigerator(); } else { DECLARE_WAITQUEUE(wq, current); @@ -2987,9 +2987,9 @@ int jfs_sync(void *arg) /* Add anon_list2 back to anon_list */ list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list); - if (current->flags & PF_FREEZE) { + if (freezing(current)) { TXN_UNLOCK(); - refrigerator(PF_FREEZE); + refrigerator(); } else { DECLARE_WAITQUEUE(wq, current); diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index fd77ed1d710d..14b3ce87fa29 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -313,7 +313,7 @@ static int nlm_wait_on_grace(wait_queue_head_t *queue) prepare_to_wait(queue, &wait, TASK_INTERRUPTIBLE); if (!signalled ()) { schedule_timeout(NLMCLNT_GRACE_WAIT); - try_to_freeze(PF_FREEZE); + try_to_freeze(); if (!signalled ()) status = 0; } diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c index c60e69431e11..df0cba239dd5 100644 --- a/fs/xfs/linux-2.6/xfs_buf.c +++ b/fs/xfs/linux-2.6/xfs_buf.c @@ -1771,9 +1771,9 @@ xfsbufd( INIT_LIST_HEAD(&tmp); do { - if (unlikely(current->flags & PF_FREEZE)) { + if (unlikely(freezing(current))) { xfsbufd_force_sleep = 1; - refrigerator(PF_FREEZE); + refrigerator(); } else { xfsbufd_force_sleep = 0; } diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c index 5fe9af38aa20..f6dd7de25927 100644 --- a/fs/xfs/linux-2.6/xfs_super.c +++ b/fs/xfs/linux-2.6/xfs_super.c @@ -483,7 +483,7 @@ xfssyncd( set_current_state(TASK_INTERRUPTIBLE); timeleft = schedule_timeout(timeleft); /* swsusp */ - try_to_freeze(PF_FREEZE); + try_to_freeze(); if (vfsp->vfs_flag & VFS_UMOUNT) break; |