On Saturday, 30 October, 2010, Sage Weil wrote:
> The 'start-sync' command initiates a sync, but does not wait for it to
> complete. A transaction is printed that can be fed to 'wait-sync', which
> will wait for it to commit.
>
> 'wait-sync' can also be used in combination with 'async-snapshot' to wait
> for an async snapshot creation to commit.
As previous, if you add or update a command, please update the man page too.
>
> Signed-off-by: Sage Weil <sage@xxxxxxxxxxxx>
> ---
> btrfs.c | 9 +++++++++
> btrfs_cmds.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
> btrfs_cmds.h | 2 ++
> 3 files changed, 60 insertions(+), 0 deletions(-)
>
> diff --git a/btrfs.c b/btrfs.c
> index c4b9a31..d45ac1f 100644
> --- a/btrfs.c
> +++ b/btrfs.c
> @@ -83,6 +83,15 @@ static struct Command commands[] = {
> "filesystem sync", "<path>\n"
> "Force a sync on the filesystem <path>."
> },
> + { do_start_sync, 1,
> + "filesystem start-sync", "<path>\n"
> + "Start a sync on the filesystem <path>, and print the
resulting\n"
> + "transaction id."
> + },
> + { do_wait_sync, 2,
> + "filesystem wait-sync", "<path> <transid>\n"
> + "Wait for the transaction <transid> on the filesystem at
<path> to commit."
> + },
> { do_resize, 2,
> "filesystem resize", "[+/-]<newsize>[gkm]|max <filesystem>\n"
> "Resize the file system. If 'max' is passed, the filesystem\n"
> diff --git a/btrfs_cmds.c b/btrfs_cmds.c
> index 6da5862..5b5bb15 100644
> --- a/btrfs_cmds.c
> +++ b/btrfs_cmds.c
> @@ -548,6 +548,55 @@ int do_fssync(int argc, char **argv)
> return 0;
> }
>
> +int do_start_sync(int argc, char **argv)
> +{
> + int fd, res;
> + char *path = argv[1];
> + __u64 transid;
> +
> + fd = open_file_or_dir(path);
> + if (fd < 0) {
> + fprintf(stderr, "ERROR: can't access to '%s'\n", path);
> + return 12;
> + }
> +
> + printf("StartSync '%s'\n", path);
> + res = ioctl(fd, BTRFS_IOC_START_SYNC, &transid);
> + close(fd);
> + if( res < 0 ){
> + fprintf(stderr, "ERROR: unable to fs-syncing '%s'\n", path);
> + return 16;
> + } else {
> + printf("transid %llu\n", (unsigned long long)transid);
> + }
> +
> + return 0;
> +}
> +
> +int do_wait_sync(int argc, char **argv)
> +{
> + int fd, res;
> + char *path = argv[1];
> + __u64 transid = atoll(argv[2]);
> +
> + fd = open_file_or_dir(path);
> + if (fd < 0) {
> + fprintf(stderr, "ERROR: can't access to '%s'\n", path);
> + return 12;
> + }
> +
> + printf("WaitSync '%s' transid %llu\n", path, (unsigned long
long)transid);
> + res = ioctl(fd, BTRFS_IOC_WAIT_SYNC, &transid);
> + close(fd);
> + if( res < 0 ){
> + fprintf(stderr, "ERROR: unable to wait-sync on '%s' transid
%llu: %s\n", path,
> + (unsigned long long)transid, strerror(errno));
> + return 16;
> + }
> +
> + return 0;
> +}
> +
> int do_scan(int argc, char **argv)
> {
> int i, fd;
> diff --git a/btrfs_cmds.h b/btrfs_cmds.h
> index c44dc79..e0e5ceb 100644
> --- a/btrfs_cmds.h
> +++ b/btrfs_cmds.h
> @@ -20,6 +20,8 @@ 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);
> +int do_start_sync(int nargs, char **argv);
> +int do_wait_sync(int nargs, char **argv);
> int do_defrag(int argc, char **argv);
> int do_show_filesystem(int nargs, char **argv);
> int do_add_volume(int nargs, char **args);
> --
> 1.7.1
>
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