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
--
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