This patch introduces new option <devid> for the command
btrfs device delete <device_path|devid>[..] <mnt>
In a user reported issue on a 3-disk-RAID1, one disk failed with its
SB unreadable. Now with this patch user will have a choice to delete
the device using devid.
The other method we could do, is to match the input device_path
to the available device_paths with in the kernel. But that won't
work in all the cases, like what if user provided mapper path
when the path within the kernel is a non-mapper path.
This patch depends on the below kernel patch for the new feature to work,
however it will fail-back to the old interface for the kernel without the
patch
Btrfs: device delete by devid
Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
v1->v2: rebase on latest devel
Documentation/btrfs-device.asciidoc | 2 +-
cmds-device.c | 43 +++++++++++++++++++++++++++++--------
ioctl.h | 8 +++++++
3 files changed, 43 insertions(+), 10 deletions(-)
diff --git a/Documentation/btrfs-device.asciidoc
b/Documentation/btrfs-device.asciidoc
index 2827598..61ede6e 100644
--- a/Documentation/btrfs-device.asciidoc
+++ b/Documentation/btrfs-device.asciidoc
@@ -74,7 +74,7 @@ do not perform discard by default
-f|--force::::
force overwrite of existing filesystem on the given disk(s)
-*remove* <dev> [<dev>...] <path>::
+*remove* <dev>|<devid> [<dev>|<devid>...] <path>::
Remove device(s) from a filesystem identified by <path>.
*delete* <dev> [<dev>...] <path>::
diff --git a/cmds-device.c b/cmds-device.c
index 0e60500..4c9b19a 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -164,16 +164,34 @@ static int _cmd_rm_dev(int argc, char **argv, const char
* const *usagestr)
struct btrfs_ioctl_vol_args arg;
int res;
- if (!is_block_device(argv[i])) {
+ struct btrfs_ioctl_vol_args_v3 argv3 = {0};
+ int its_num = false;
+
+ if (is_numerical(argv[i])) {
+ argv3.devid = arg_strtou64(argv[i]);
+ its_num = true;
+ } else if (is_block_device(argv[i])) {
+ strncpy_null(argv3.name, argv[i]);
+ } else {
fprintf(stderr,
- "ERROR: %s is not a block device\n", argv[i]);
+ "ERROR: %s is not a block device or devid\n",
argv[i]);
ret++;
continue;
}
- memset(&arg, 0, sizeof(arg));
- strncpy_null(arg.name, argv[i]);
- res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
+ res = ioctl(fdmnt, BTRFS_IOC_RM_DEV_V2, &argv3);
e = errno;
+ if (res && e == ENOTTY) {
+ if (its_num) {
+ fprintf(stderr,
+ "Error: Kernel does not support delete by
devid\n");
+ ret = 1;
+ continue;
+ }
+ memset(&arg, 0, sizeof(arg));
+ strncpy_null(arg.name, argv[i]);
+ res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
+ e = errno;
+ }
if (res) {
const char *msg;
@@ -181,9 +199,16 @@ static int _cmd_rm_dev(int argc, char **argv, const char *
const *usagestr)
msg = btrfs_err_str(res);
else
msg = strerror(e);
- fprintf(stderr,
- "ERROR: error removing the device '%s' - %s\n",
- argv[i], msg);
+
+ if (its_num)
+ fprintf(stderr,
+ "ERROR: error removing the devid '%llu'
- %s\n",
+ argv3.devid, msg);
+ else
+ fprintf(stderr,
+ "ERROR: error removing the device '%s'
- %s\n",
+ argv[i], msg);
+
ret++;
}
}
@@ -193,7 +218,7 @@ static int _cmd_rm_dev(int argc, char **argv, const char *
const *usagestr)
}
static const char * const cmd_rm_dev_usage[] = {
- "btrfs device remove <device> [<device>...] <path>",
+ "btrfs device remove <device>|<devid> [<device>|<devid>...] <path>",
"Remove a device from a filesystem",
NULL
};
diff --git a/ioctl.h b/ioctl.h
index dff015a..6870931 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -40,6 +40,12 @@ struct btrfs_ioctl_vol_args {
char name[BTRFS_PATH_NAME_MAX + 1];
};
+struct btrfs_ioctl_vol_args_v3 {
+ __s64 fd;
+ char name[BTRFS_PATH_NAME_MAX + 1];
+ __u64 devid;
+};
+
#define BTRFS_DEVICE_PATH_NAME_MAX 1024
#define BTRFS_SUBVOL_CREATE_ASYNC (1ULL << 0)
@@ -683,6 +689,8 @@ static inline char *btrfs_err_str(enum btrfs_err_code
err_code)
struct btrfs_ioctl_feature_flags[2])
#define BTRFS_IOC_GET_SUPPORTED_FEATURES _IOR(BTRFS_IOCTL_MAGIC, 57, \
struct btrfs_ioctl_feature_flags[3])
+#define BTRFS_IOC_RM_DEV_V2 _IOW(BTRFS_IOCTL_MAGIC, 58, \
+ struct btrfs_ioctl_vol_args_v3)
#ifdef __cplusplus
}
#endif
--
2.4.1
--
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