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authorChris Mason <chris.mason@oracle.com>2009-01-16 17:59:08 +0100
committerChris Mason <chris.mason@oracle.com>2009-01-16 17:59:08 +0100
commitc071fcfdb60e7abbe95e02460005d6bca165bf24 (patch)
tree2f7b32f7a554e03e012586ae429ea3bd2794fcb6 /fs/btrfs/super.c
parentBtrfs: Clear the device->running_pending flag before bailing on congestion (diff)
downloadlinux-c071fcfdb60e7abbe95e02460005d6bca165bf24.tar.xz
linux-c071fcfdb60e7abbe95e02460005d6bca165bf24.zip
Btrfs: fix ioctl arg size (userland incompatible change!)
The structure used to send device in btrfs ioctl calls was not properly aligned, and so 32 bit ioctls would not work properly on 64 bit kernels. We could fix this with compat ioctls, but we're just one byte away and it doesn't make sense at this stage to carry about the compat ioctls forever at this stage in the project. This patch brings the ioctl arg up to an evenly aligned 4k. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to '')
-rw-r--r--fs/btrfs/super.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index b4c101d9322c..92c9b543deff 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -582,7 +582,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
{
struct btrfs_ioctl_vol_args *vol;
struct btrfs_fs_devices *fs_devices;
- int ret = 0;
+ int ret = -ENOTTY;
int len;
if (!capable(CAP_SYS_ADMIN))
@@ -594,6 +594,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
goto out;
}
len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
+
switch (cmd) {
case BTRFS_IOC_SCAN_DEV:
ret = btrfs_scan_one_device(vol->name, FMODE_READ,