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author | 2010-12-20 15:53:28 +0800 | |
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committer | 2010-12-23 08:49:15 +0800 | |
commit | fa0d2b9bd717340e0bc4850a80ac0eb344e9a7fb (patch) | |
tree | f17b1e86d602236e7be49821ed8f9109819e29fb /fs/btrfs/ioctl.c | |
parent | Btrfs: prevent RAID level downgrades when space is low (diff) | |
download | linux-fa0d2b9bd717340e0bc4850a80ac0eb344e9a7fb.tar.gz linux-fa0d2b9bd717340e0bc4850a80ac0eb344e9a7fb.tar.bz2 linux-fa0d2b9bd717340e0bc4850a80ac0eb344e9a7fb.zip |
Btrfs: Refactor btrfs_ioctl_snap_create()
Split it into two functions for two different ioctls, since they
share no common code.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/ioctl.c')
-rw-r--r-- | fs/btrfs/ioctl.c | 84 |
1 files changed, 40 insertions, 44 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index f87552a1d7ea..02554e19d974 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -946,58 +946,54 @@ out: } static noinline int btrfs_ioctl_snap_create(struct file *file, - void __user *arg, int subvol, - int v2) + void __user *arg, int subvol) { - struct btrfs_ioctl_vol_args *vol_args = NULL; - struct btrfs_ioctl_vol_args_v2 *vol_args_v2 = NULL; - char *name; - u64 fd; + struct btrfs_ioctl_vol_args *vol_args; int ret; - if (v2) { - u64 transid = 0; - u64 *ptr = NULL; + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); + vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; - vol_args_v2 = memdup_user(arg, sizeof(*vol_args_v2)); - if (IS_ERR(vol_args_v2)) - return PTR_ERR(vol_args_v2); + ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, + vol_args->fd, subvol, NULL); - if (vol_args_v2->flags & ~BTRFS_SUBVOL_CREATE_ASYNC) { - ret = -EINVAL; - goto out; - } - - name = vol_args_v2->name; - fd = vol_args_v2->fd; - vol_args_v2->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; + kfree(vol_args); + return ret; +} - if (vol_args_v2->flags & BTRFS_SUBVOL_CREATE_ASYNC) - ptr = &transid; +static noinline int btrfs_ioctl_snap_create_v2(struct file *file, + void __user *arg, int subvol) +{ + struct btrfs_ioctl_vol_args_v2 *vol_args; + int ret; + u64 transid = 0; + u64 *ptr = NULL; - ret = btrfs_ioctl_snap_create_transid(file, name, fd, - subvol, ptr); + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); + vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; - if (ret == 0 && ptr && - copy_to_user(arg + - offsetof(struct btrfs_ioctl_vol_args_v2, - transid), ptr, sizeof(*ptr))) - ret = -EFAULT; - } else { - vol_args = memdup_user(arg, sizeof(*vol_args)); - if (IS_ERR(vol_args)) - return PTR_ERR(vol_args); - name = vol_args->name; - fd = vol_args->fd; - vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; - - ret = btrfs_ioctl_snap_create_transid(file, name, fd, - subvol, NULL); + if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ASYNC) { + ret = -EINVAL; + goto out; } + + if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) + ptr = &transid; + + ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, + vol_args->fd, subvol, ptr); + + if (ret == 0 && ptr && + copy_to_user(arg + + offsetof(struct btrfs_ioctl_vol_args_v2, + transid), ptr, sizeof(*ptr))) + ret = -EFAULT; out: kfree(vol_args); - kfree(vol_args_v2); - return ret; } @@ -2257,11 +2253,11 @@ long btrfs_ioctl(struct file *file, unsigned int case FS_IOC_GETVERSION: return btrfs_ioctl_getversion(file, argp); case BTRFS_IOC_SNAP_CREATE: - return btrfs_ioctl_snap_create(file, argp, 0, 0); + return btrfs_ioctl_snap_create(file, argp, 0); case BTRFS_IOC_SNAP_CREATE_V2: - return btrfs_ioctl_snap_create(file, argp, 0, 1); + return btrfs_ioctl_snap_create_v2(file, argp, 0); case BTRFS_IOC_SUBVOL_CREATE: - return btrfs_ioctl_snap_create(file, argp, 1, 0); + return btrfs_ioctl_snap_create(file, argp, 1); case BTRFS_IOC_SNAP_DESTROY: return btrfs_ioctl_snap_destroy(file, argp); case BTRFS_IOC_DEFAULT_SUBVOL: |