Add an option to the btrfs tool to use the ioctl for cancelling
balance operations.
SIgned-off-by: Hugo Mills <h...@carfax.org.uk>
---
btrfs.c | 4 ++++
btrfs_cmds.c | 41 +++++++++++++++++++++++++++++++++++++++++
btrfs_cmds.h | 1 +
ioctl.h | 1 +
4 files changed, 47 insertions(+)
Index: btrfs-progs-unstable/btrfs.c
===================================================================
--- btrfs-progs-unstable.orig/btrfs.c 2010-10-30 00:19:59.968416575 +0100
+++ btrfs-progs-unstable/btrfs.c 2010-10-30 00:20:38.446849736 +0100
@@ -99,6 +99,10 @@
"balance progress", "<path>\n"
"Show progress of the balance operation running on <path>."
},
+ { do_balance_cancel, 1,
+ "balance cancel", "<path>\n"
+ "Cancel the balance operation running on <path>."
+ },
{ do_scan,
999, "device scan", "[<device> [<device>..]\n"
"Scan all device for or the passed device for a btrfs\n"
Index: btrfs-progs-unstable/btrfs_cmds.c
===================================================================
--- btrfs-progs-unstable.orig/btrfs_cmds.c 2010-10-30 00:04:48.335524683
+0100
+++ btrfs-progs-unstable/btrfs_cmds.c 2010-10-30 00:20:22.267508562 +0100
@@ -848,6 +848,47 @@
return 0;
}
+int do_balance_cancel(int nargs, char **argv)
+{
+ char *path = argv[1];
+ int fdmnt;
+ int ret = 0;
+ int err = 0;
+
+ fdmnt = open_file_or_dir(path);
+ if(fdmnt < 0) {
+ fprintf(stderr, "ERROR: can't access '%s'\n", path);
+ return 12;
+ }
+
+ ret = ioctl(fdmnt, BTRFS_IOC_BALANCE_CANCEL, NULL);
+ err = errno;
+
+ if(ret) {
+ switch(err) {
+ case 0:
+ break;
+ case EINVAL:
+ fprintf(stderr, "ERROR: no balance in progress.\n");
+ err = 20;
+ break;
+ case ECANCELED:
+ fprintf(stderr, "ERROR: operation already
cancelled.\n");
+ err = 21;
+ break;
+ default:
+ fprintf(stderr, "ERROR: ioctl returned error '%d'.\n",
+ err);
+ err = 22;
+ break;
+ }
+ }
+
+ close(fdmnt);
+
+ return err;
+}
+
int do_remove_volume(int nargs, char **args)
{
Index: btrfs-progs-unstable/btrfs_cmds.h
===================================================================
--- btrfs-progs-unstable.orig/btrfs_cmds.h 2010-10-30 00:04:48.335524683
+0100
+++ btrfs-progs-unstable/btrfs_cmds.h 2010-10-30 00:20:22.307506934 +0100
@@ -24,6 +24,7 @@
int do_add_volume(int nargs, char **args);
int do_balance(int nargs, char **argv);
int do_balance_progress(int nargs, char **argv);
+int do_balance_cancel(int nargs, char **argv);
int do_remove_volume(int nargs, char **args);
int do_scan(int nargs, char **argv);
int do_resize(int nargs, char **argv);
Index: btrfs-progs-unstable/ioctl.h
===================================================================
--- btrfs-progs-unstable.orig/ioctl.h 2010-10-30 00:04:48.325525089 +0100
+++ btrfs-progs-unstable/ioctl.h 2010-10-30 00:20:22.357504895 +0100
@@ -176,4 +176,5 @@
struct btrfs_ioctl_space_args)
#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 21, \
struct btrfs_ioctl_balance_progress)
+#define BTRFS_IOC_BALANCE_CANCEL _IO(BTRFS_IOCTL_MAGIC, 22)
#endif
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