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| author | Louis Rilling <louis.rilling@kerlabs.com> | 2009-12-04 14:52:42 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-12-04 16:36:18 +0100 |
| commit | b69f2292063d2caf37ca9aec7d63ded203701bf3 (patch) | |
| tree | be4acb81ea4ab7014047808ec2b2c908e8334f55 | |
| parent | 61cc74fbb87af6aa551a06a370590c9bc07e29d9 (diff) | |
| download | op-kernel-dev-b69f2292063d2caf37ca9aec7d63ded203701bf3.zip op-kernel-dev-b69f2292063d2caf37ca9aec7d63ded203701bf3.tar.gz | |
block: Fix io_context leak after failure of clone with CLONE_IO
With CLONE_IO, parent's io_context->nr_tasks is incremented, but never
decremented whenever copy_process() fails afterwards, which prevents
exit_io_context() from calling IO schedulers exit functions.
Give a task_struct to exit_io_context(), and call exit_io_context() instead of
put_io_context() in copy_process() cleanup path.
Signed-off-by: Louis Rilling <louis.rilling@kerlabs.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | block/blk-ioc.c | 10 | ||||
| -rw-r--r-- | include/linux/iocontext.h | 5 | ||||
| -rw-r--r-- | kernel/exit.c | 2 | ||||
| -rw-r--r-- | kernel/fork.c | 3 |
4 files changed, 11 insertions, 9 deletions
diff --git a/block/blk-ioc.c b/block/blk-ioc.c index dcd0412..cbdabb0 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -66,14 +66,14 @@ static void cfq_exit(struct io_context *ioc) } /* Called by the exitting task */ -void exit_io_context(void) +void exit_io_context(struct task_struct *task) { struct io_context *ioc; - task_lock(current); - ioc = current->io_context; - current->io_context = NULL; - task_unlock(current); + task_lock(task); + ioc = task->io_context; + task->io_context = NULL; + task_unlock(task); if (atomic_dec_and_test(&ioc->nr_tasks)) { if (ioc->aic && ioc->aic->exit) diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h index d61b0b8..a632359 100644 --- a/include/linux/iocontext.h +++ b/include/linux/iocontext.h @@ -98,14 +98,15 @@ static inline struct io_context *ioc_task_link(struct io_context *ioc) return NULL; } +struct task_struct; #ifdef CONFIG_BLOCK int put_io_context(struct io_context *ioc); -void exit_io_context(void); +void exit_io_context(struct task_struct *task); struct io_context *get_io_context(gfp_t gfp_flags, int node); struct io_context *alloc_io_context(gfp_t gfp_flags, int node); void copy_io_context(struct io_context **pdst, struct io_context **psrc); #else -static inline void exit_io_context(void) +static inline void exit_io_context(struct task_struct *task) { } diff --git a/kernel/exit.c b/kernel/exit.c index f7864ac..2544000 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -1004,7 +1004,7 @@ NORET_TYPE void do_exit(long code) tsk->flags |= PF_EXITPIDONE; if (tsk->io_context) - exit_io_context(); + exit_io_context(tsk); if (tsk->splice_pipe) __free_pipe_info(tsk->splice_pipe); diff --git a/kernel/fork.c b/kernel/fork.c index 166b8c4..6073534 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1310,7 +1310,8 @@ bad_fork_free_pid: if (pid != &init_struct_pid) free_pid(pid); bad_fork_cleanup_io: - put_io_context(p->io_context); + if (p->io_context) + exit_io_context(p); bad_fork_cleanup_namespaces: exit_task_namespaces(p); bad_fork_cleanup_mm: |
