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.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
block/compat_ioctl.c | 56 ------------------------------------------
block/ioctl.c | 2 -
include/linux/blktrace_api.h | 12 +++++++++
kernel/trace/blktrace.c | 43 ++++++++++++++++++++++++++++++++
4 files changed, 55 insertions(+), 58 deletions(-)
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 @@ out:
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 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
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 416bf62..d4dd16c 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 int blk_trace_init_sysfs(struct device *dev);
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 638711c..ef4a294 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -549,6 +549,41 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
}
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;
@@ -601,6 +636,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
if (!q)
return -ENXIO;
+ lock_kernel();
mutex_lock(&bdev->bd_mutex);
switch (cmd) {
@@ -608,6 +644,12 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
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:
@@ -622,6 +664,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
}
mutex_unlock(&bdev->bd_mutex);
+ unlock_kernel();
return ret;
}
--
1.7.1
--
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