block: push BKL into blktrace ioctls
The blktrace driver currently needs the BKL, but
we should not need to take that in the block layer,
so just push it down into the driver itself.
It is quite likely that the BKL is not actually
required in blktrace code and could be removed
in a follow-on patch.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index f26051f..d530856 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -535,56 +535,6 @@
return err;
}
-struct compat_blk_user_trace_setup {
- char name[32];
- u16 act_mask;
- u32 buf_size;
- u32 buf_nr;
- compat_u64 start_lba;
- compat_u64 end_lba;
- u32 pid;
-};
-#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
-
-static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
-{
- struct blk_user_trace_setup buts;
- struct compat_blk_user_trace_setup cbuts;
- struct request_queue *q;
- char b[BDEVNAME_SIZE];
- int ret;
-
- q = bdev_get_queue(bdev);
- if (!q)
- return -ENXIO;
-
- if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
- return -EFAULT;
-
- bdevname(bdev, b);
-
- buts = (struct blk_user_trace_setup) {
- .act_mask = cbuts.act_mask,
- .buf_size = cbuts.buf_size,
- .buf_nr = cbuts.buf_nr,
- .start_lba = cbuts.start_lba,
- .end_lba = cbuts.end_lba,
- .pid = cbuts.pid,
- };
- memcpy(&buts.name, &cbuts.name, 32);
-
- mutex_lock(&bdev->bd_mutex);
- ret = do_blk_trace_setup(q, b, bdev->bd_dev, bdev, &buts);
- mutex_unlock(&bdev->bd_mutex);
- if (ret)
- return ret;
-
- if (copy_to_user(arg, &buts.name, 32))
- return -EFAULT;
-
- return 0;
-}
-
static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
unsigned cmd, unsigned long arg)
{
@@ -802,16 +752,10 @@
return compat_put_u64(arg, bdev->bd_inode->i_size);
case BLKTRACESETUP32:
- lock_kernel();
- ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
- unlock_kernel();
- return ret;
case BLKTRACESTART: /* compatible */
case BLKTRACESTOP: /* compatible */
case BLKTRACETEARDOWN: /* compatible */
- lock_kernel();
ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
- unlock_kernel();
return ret;
default:
if (disk->fops->compat_ioctl)
diff --git a/block/ioctl.c b/block/ioctl.c
index 1cfa8d4..9d91e83 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -320,9 +320,7 @@
case BLKTRACESTOP:
case BLKTRACESETUP:
case BLKTRACETEARDOWN:
- lock_kernel();
ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
- unlock_kernel();
break;
default:
ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index 23faa67..07c6986 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -5,6 +5,7 @@
#ifdef __KERNEL__
#include <linux/blkdev.h>
#include <linux/relay.h>
+#include <linux/compat.h>
#endif
/*
@@ -203,6 +204,17 @@
extern struct attribute_group blk_trace_attr_group;
+struct compat_blk_user_trace_setup {
+ char name[32];
+ u16 act_mask;
+ u32 buf_size;
+ u32 buf_nr;
+ compat_u64 start_lba;
+ compat_u64 end_lba;
+ u32 pid;
+};
+#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
+
#else /* !CONFIG_BLK_DEV_IO_TRACE */
# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
# define blk_trace_shutdown(q) do { } while (0)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 3b4a695..82499a5 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -552,6 +552,41 @@
}
EXPORT_SYMBOL_GPL(blk_trace_setup);
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+static int compat_blk_trace_setup(struct request_queue *q, char *name,
+ dev_t dev, struct block_device *bdev,
+ char __user *arg)
+{
+ struct blk_user_trace_setup buts;
+ struct compat_blk_user_trace_setup cbuts;
+ int ret;
+
+ if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
+ return -EFAULT;
+
+ buts = (struct blk_user_trace_setup) {
+ .act_mask = cbuts.act_mask,
+ .buf_size = cbuts.buf_size,
+ .buf_nr = cbuts.buf_nr,
+ .start_lba = cbuts.start_lba,
+ .end_lba = cbuts.end_lba,
+ .pid = cbuts.pid,
+ };
+ memcpy(&buts.name, &cbuts.name, 32);
+
+ ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
+ if (ret)
+ return ret;
+
+ if (copy_to_user(arg, &buts.name, 32)) {
+ blk_trace_remove(q);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+#endif
+
int blk_trace_startstop(struct request_queue *q, int start)
{
int ret;
@@ -604,6 +639,7 @@
if (!q)
return -ENXIO;
+ lock_kernel();
mutex_lock(&bdev->bd_mutex);
switch (cmd) {
@@ -611,6 +647,12 @@
bdevname(bdev, b);
ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
break;
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+ case BLKTRACESETUP32:
+ bdevname(bdev, b);
+ ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
+ break;
+#endif
case BLKTRACESTART:
start = 1;
case BLKTRACESTOP:
@@ -625,6 +667,7 @@
}
mutex_unlock(&bdev->bd_mutex);
+ unlock_kernel();
return ret;
}
