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-rw-r--r--cmds-device.c10
-rw-r--r--ioctl.h43
2 files changed, 50 insertions, 3 deletions
diff --git a/cmds-device.c b/cmds-device.c
index c1dc363a..be2aaff3 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -165,8 +165,14 @@ static int cmd_rm_dev(int argc, char **argv)
strncpy_null(arg.name, argv[i]);
res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
e = errno;
- if(res<0){
- fprintf(stderr, "ERROR: error removing the device '%s' - %s\n",
+ if (res > 0) {
+ fprintf(stderr,
+ "ERROR: error removing the device '%s' - %s\n",
+ argv[i], btrfs_err_str(res));
+ ret++;
+ } else if (res < 0) {
+ fprintf(stderr,
+ "ERROR: error removing the device '%s' - %s\n",
argv[i], strerror(e));
ret++;
}
diff --git a/ioctl.h b/ioctl.h
index f7864100..27521d5c 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -455,6 +455,48 @@ struct btrfs_ioctl_qgroup_create_args {
__u64 create;
__u64 qgroupid;
};
+
+/* Error codes as returned by the kernel */
+enum btrfs_err_code {
+ notused,
+ BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_TGT_REPLACE,
+ BTRFS_ERROR_DEV_MISSING_NOT_FOUND,
+ BTRFS_ERROR_DEV_ONLY_WRITABLE,
+ BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
+};
+
+/* An error code to error string mapping for the kernel
+* error codes
+*/
+static inline char *btrfs_err_str(enum btrfs_err_code err_code)
+{
+ switch (err_code) {
+ case BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET:
+ return "unable to go below two devices on raid1";
+ case BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET:
+ return "unable to go below four devices on raid10";
+ case BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET:
+ return "unable to go below two devices on raid5";
+ case BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET:
+ return "unable to go below three devices on raid6";
+ case BTRFS_ERROR_DEV_TGT_REPLACE:
+ return "unable to remove the dev_replace target dev";
+ case BTRFS_ERROR_DEV_MISSING_NOT_FOUND:
+ return "no missing devices found to remove";
+ case BTRFS_ERROR_DEV_ONLY_WRITABLE:
+ return "unable to remove the only writeable device";
+ case BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS:
+ return "add/delete/balance/replace/resize operation "
+ "in progress";
+ default:
+ return NULL;
+ }
+}
+
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@@ -550,7 +592,6 @@ struct btrfs_ioctl_clone_range_args {
struct btrfs_ioctl_get_dev_stats)
#define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
struct btrfs_ioctl_dev_replace_args)
-
#ifdef __cplusplus
}
#endif