From 171044d449611c6e5040b37210ff6aba47f33ee4 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 9 Oct 2007 13:23:53 +0200 Subject: compat_ioctl: handle blk_trace ioctls blk_trace_setup is broken on x86_64 compat systems, this makes the code work correctly on all 64 bit architectures in compat mode. Signed-off-by: Arnd Bergmann Signed-off-by: Jens Axboe --- block/blktrace.c | 54 ++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 34 insertions(+), 20 deletions(-) (limited to 'block/blktrace.c') diff --git a/block/blktrace.c b/block/blktrace.c index 20fa034ea4a2..775471ef84a5 100644 --- a/block/blktrace.c +++ b/block/blktrace.c @@ -312,33 +312,26 @@ static struct rchan_callbacks blk_relay_callbacks = { /* * Setup everything required to start tracing */ -static int blk_trace_setup(struct request_queue *q, struct block_device *bdev, - char __user *arg) +int do_blk_trace_setup(struct request_queue *q, struct block_device *bdev, + struct blk_user_trace_setup *buts) { - struct blk_user_trace_setup buts; struct blk_trace *old_bt, *bt = NULL; struct dentry *dir = NULL; char b[BDEVNAME_SIZE]; int ret, i; - if (copy_from_user(&buts, arg, sizeof(buts))) - return -EFAULT; - - if (!buts.buf_size || !buts.buf_nr) + if (!buts->buf_size || !buts->buf_nr) return -EINVAL; - strcpy(buts.name, bdevname(bdev, b)); + strcpy(buts->name, bdevname(bdev, b)); /* * some device names have larger paths - convert the slashes * to underscores for this to work as expected */ - for (i = 0; i < strlen(buts.name); i++) - if (buts.name[i] == '/') - buts.name[i] = '_'; - - if (copy_to_user(arg, &buts, sizeof(buts))) - return -EFAULT; + for (i = 0; i < strlen(buts->name); i++) + if (buts->name[i] == '/') + buts->name[i] = '_'; ret = -ENOMEM; bt = kzalloc(sizeof(*bt), GFP_KERNEL); @@ -350,7 +343,7 @@ static int blk_trace_setup(struct request_queue *q, struct block_device *bdev, goto err; ret = -ENOENT; - dir = blk_create_tree(buts.name); + dir = blk_create_tree(buts->name); if (!dir) goto err; @@ -363,20 +356,21 @@ static int blk_trace_setup(struct request_queue *q, struct block_device *bdev, if (!bt->dropped_file) goto err; - bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, &blk_relay_callbacks, bt); + bt->rchan = relay_open("trace", dir, buts->buf_size, + buts->buf_nr, &blk_relay_callbacks, bt); if (!bt->rchan) goto err; - bt->act_mask = buts.act_mask; + bt->act_mask = buts->act_mask; if (!bt->act_mask) bt->act_mask = (u16) -1; - bt->start_lba = buts.start_lba; - bt->end_lba = buts.end_lba; + bt->start_lba = buts->start_lba; + bt->end_lba = buts->end_lba; if (!bt->end_lba) bt->end_lba = -1ULL; - bt->pid = buts.pid; + bt->pid = buts->pid; bt->trace_state = Blktrace_setup; ret = -EBUSY; @@ -401,6 +395,26 @@ err: return ret; } +static int blk_trace_setup(struct request_queue *q, struct block_device *bdev, + char __user *arg) +{ + struct blk_user_trace_setup buts; + int ret; + + ret = copy_from_user(&buts, arg, sizeof(buts)); + if (ret) + return -EFAULT; + + ret = do_blk_trace_setup(q, bdev, &buts); + if (ret) + return ret; + + if (copy_to_user(arg, &buts, sizeof(buts))) + return -EFAULT; + + return 0; +} + static int blk_trace_startstop(struct request_queue *q, int start) { struct blk_trace *bt; -- cgit v1.2.3