On Saturday, 30 October, 2010, Sage Weil wrote:
> This is identical to 'snapshot', but uses the new async snapshot creation
> ioctl, and prints out the transid the new snapshot will be committed
> with.
>
> Signed-off-by: Sage Weil <s...@newdream.net>
> ---
> btrfs.c | 8 +++++++-
> btrfs_cmds.c | 32 +++++++++++++++++++++++++++-----
> btrfs_cmds.h | 3 ++-
> 3 files changed, 36 insertions(+), 7 deletions(-)
>
> diff --git a/btrfs.c b/btrfs.c
> index 46314cf..c4b9a31 100644
> --- a/btrfs.c
> +++ b/btrfs.c
> @@ -44,11 +44,17 @@ static struct Command commands[] = {
> /*
> avoid short commands different for the case only
> */
> - { do_clone, 2,
> + { do_create_snap, 2,
> "subvolume snapshot", "<source> [<dest>/]<name>\n"
> "Create a writable snapshot of the subvolume <source> with\n"
> "the name <name> in the <dest> directory."
> },
> + { do_create_snap_async, 2,
> + "subvolume async-snapshot", "<source> [<dest>/]<name>\n"
> + "Create a writable snapshot of the subvolume <source> with\n"
> + "the name <name> in the <dest> directory. Do not wait for\n"
> + "the snapshot creation to commit to disk before returning."
> + },
Why create another command ? I think that it is better add a switch like
btrfs subvolume snapshot [--async] <source> [<dest>/]<name>
Create a writable snapshot of the subvolume <source> with
the name <name> in the <dest> directory. If --async is
passed, do not wait for the snapshot creation to commit to
disk before returning.
In any case, please update the man page too.
> { do_delete_subvolume, 1,
> "subvolume delete", "<subvolume>\n"
> "Delete the subvolume <subvolume>."
> diff --git a/btrfs_cmds.c b/btrfs_cmds.c
> index 8031c58..6da5862 100644
> --- a/btrfs_cmds.c
> +++ b/btrfs_cmds.c
> @@ -307,7 +307,7 @@ int do_subvol_list(int argc, char **argv)
> return 0;
> }
>
> -int do_clone(int argc, char **argv)
> +static int create_snap(int argc, char **argv, int async)
> {
> char *subvol, *dst;
> int res, fd, fddst, len;
> @@ -316,7 +316,6 @@ int do_clone(int argc, char **argv)
>
> subvol = argv[1];
> dst = argv[2];
> - struct btrfs_ioctl_vol_args args;
>
> res = test_issubvolume(subvol);
> if(res<0){
> @@ -374,9 +373,22 @@ int do_clone(int argc, char **argv)
>
> printf("Create a snapshot of '%s' in '%s/%s'\n",
> subvol, dstdir, newname);
> - args.fd = fd;
> - strcpy(args.name, newname);
> - res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE, &args);
> + if (async) {
> + struct btrfs_ioctl_async_vol_args async_args;
> + async_args.fd = fd;
> + async_args.transid = 0;
> + strcpy(async_args.name, newname);
> + res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE_ASYNC, &async_args);
> + if (res == 0)
> + printf("transid %llu\n",
> + (unsigned long long)async_args.transid);
> + } else {
> + struct btrfs_ioctl_vol_args args;
> +
> + args.fd = fd;
> + strcpy(args.name, newname);
> + res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE, &args);
> + }
>
> close(fd);
> close(fddst);
> @@ -390,6 +402,16 @@ int do_clone(int argc, char **argv)
>
> }
>
> +int do_create_snap_async(int argc, char **argv)
> +{
> + return create_snap(argc, argv, 1);
> +}
> +
> +int do_create_snap(int argc, char **argv)
> +{
> + return create_snap(argc, argv, 0);
> +}
> +
> int do_delete_subvolume(int argc, char **argv)
> {
> int res, fd, len;
> diff --git a/btrfs_cmds.h b/btrfs_cmds.h
> index 7bde191..c44dc79 100644
> --- a/btrfs_cmds.h
> +++ b/btrfs_cmds.h
> @@ -15,7 +15,8 @@
> */
>
> /* btrfs_cmds.c*/
> -int do_clone(int nargs, char **argv);
> +int do_create_snap(int nargs, char **argv);
> +int do_create_snap_async(int nargs, char **argv);
> int do_delete_subvolume(int nargs, char **argv);
> int do_create_subvol(int nargs, char **argv);
> int do_fssync(int nargs, char **argv);
> --
> 1.7.1
>
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