With -w one can wait for a rescan operation to finish. It can be used when starting a rescan operation or later to wait for the currently running rescan operation to finish. Waiting is interruptible.
Signed-off-by: Jan Schmidt <list.bt...@jan-o-sch.net> --- cmds-quota.c | 19 +++++++++++++++++-- ioctl.h | 1 + 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/cmds-quota.c b/cmds-quota.c index 1169772..6557e83 100644 --- a/cmds-quota.c +++ b/cmds-quota.c @@ -90,10 +90,11 @@ static int cmd_quota_disable(int argc, char **argv) } static const char * const cmd_quota_rescan_usage[] = { - "btrfs quota rescan [-s] <path>", + "btrfs quota rescan [-sw] <path>", "Trash all qgroup numbers and scan the metadata again with the current config.", "", "-s show status of a running rescan operation", + "-w wait for rescan operation to finish (can be already in progress)", NULL }; @@ -105,21 +106,30 @@ static int cmd_quota_rescan(int argc, char **argv) char *path = NULL; struct btrfs_ioctl_quota_rescan_args args; int ioctlnum = BTRFS_IOC_QUOTA_RESCAN; + int wait_for_completion = 0; optind = 1; while (1) { - int c = getopt(argc, argv, "s"); + int c = getopt(argc, argv, "sw"); if (c < 0) break; switch (c) { case 's': ioctlnum = BTRFS_IOC_QUOTA_RESCAN_STATUS; break; + case 'w': + wait_for_completion = 1; + break; default: usage(cmd_quota_rescan_usage); } } + if (ioctlnum != BTRFS_IOC_QUOTA_RESCAN && wait_for_completion) { + fprintf(stderr, "ERROR: -w cannot be used with -s\n"); + return 12; + } + if (check_argc_exact(argc - optind, 1)) usage(cmd_quota_rescan_usage); @@ -134,6 +144,11 @@ static int cmd_quota_rescan(int argc, char **argv) ret = ioctl(fd, ioctlnum, &args); e = errno; + + if (wait_for_completion && (ret == 0 || e == EINPROGRESS)) { + ret = ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_WAIT, &args); + e = errno; + } close(fd); if (ioctlnum == BTRFS_IOC_QUOTA_RESCAN) { diff --git a/ioctl.h b/ioctl.h index abe6dd4..c260bbf 100644 --- a/ioctl.h +++ b/ioctl.h @@ -529,6 +529,7 @@ struct btrfs_ioctl_clone_range_args { struct btrfs_ioctl_quota_rescan_args) #define BTRFS_IOC_QUOTA_RESCAN_STATUS _IOR(BTRFS_IOCTL_MAGIC, 45, \ struct btrfs_ioctl_quota_rescan_args) +#define BTRFS_IOC_QUOTA_RESCAN_WAIT _IO(BTRFS_IOCTL_MAGIC, 46) #define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \ char[BTRFS_LABEL_SIZE]) #define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html