From: Anand Jain <anand.j...@oracle.com>
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: Introduce device delete by devid
Signed-off-by: Anand Jain <anand.j...@oracle.com>
[ refresh on top of current code, sync with latest kernel patches, other
minor changes ]
Signed-off-by: David Sterba <dste...@suse.com>
---
v5: as below but on devel branch
v4: a. For future benefit we should check for EOPNOTSUPP errno as well.
b. Update the changes to be inline with kernel that is
BTRFS_DEVICE_SPEC_BY_ID and BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED
naming changes. and
c. As I remember David Sterba renamed its_num to is_devid but in
the devel branch I don't see it, so add it back.
d. reword error string and use strerror
v3: enahnced btrfs_ioctl_vol_args_v2 to accept devid instead of
creating a new structure. Thanks to David.
Changed subject from
btrfs-progs: device delete to accept devid
v2: update the missed Documentation for delete (not just remove) as well.
Thanks to Goffredo.
Documentation/btrfs-device.asciidoc | 4 ++--
cmds-device.c | 47 ++++++++++++++++++++++++++++++-------
ioctl.h | 15 +++++++++++-
3 files changed, 55 insertions(+), 11 deletions(-)
diff --git a/Documentation/btrfs-device.asciidoc
b/Documentation/btrfs-device.asciidoc
index 2827598a37f5..bd878f4c33e1 100644
--- a/Documentation/btrfs-device.asciidoc
+++ b/Documentation/btrfs-device.asciidoc
@@ -74,10 +74,10 @@ 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>::
+*delete* <dev>|<devid> [<dev>|<devid>...] <path>::
Alias of remove kept for backwards compatability
*ready* <device>::
diff --git a/cmds-device.c b/cmds-device.c
index 50c1c5dfb394..c0f6e681bf40 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -157,20 +157,46 @@ static int _cmd_device_remove(int argc, char **argv,
for(i=1 ; i < argc - 1; i++ ){
struct btrfs_ioctl_vol_args arg;
+ struct btrfs_ioctl_vol_args_v2 argv2 = {0};
+ int is_devid = 0;
int res;
- if (is_block_device(argv[i]) != 1 && strcmp(argv[i],
"missing")) {
+ if (string_is_numerical(argv[i])) {
+ argv2.devid = arg_strtou64(argv[i]);
+ argv2.flags = BTRFS_DEVICE_SPEC_BY_ID;
+ is_devid = 1;
+ } else if (is_block_device(argv[i]) == 1 ||
+ strcmp(argv[i], "missing") == 0) {
+ strncpy_null(argv2.name, argv[i]);
+ } else {
error("not a block device: %s", argv[i]);
ret++;
continue;
}
- memset(&arg, 0, sizeof(arg));
- strncpy_null(arg.name, argv[i]);
+
/*
* Positive values are from BTRFS_ERROR_DEV_*,
* otherwise it's a generic error, one of errnos
*/
- res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
+ res = ioctl(fdmnt, BTRFS_IOC_RM_DEV_V2, &argv2);
+
+ /*
+ * if BTRFS_IOC_RM_DEV_V2 is not supported we get ENOTTY and if
+ * argv2.flags includes a flag which kernel don't understand
then
+ * we shall get EOPNOTSUPP
+ */
+ if (res < 0 && (errno == ENOTTY || errno == EOPNOTSUPP)) {
+ if (is_devid) {
+ error("device delete by id failed: %s",
+ strerror(errno));
+ ret++;
+ continue;
+ }
+ memset(&arg, 0, sizeof(arg));
+ strncpy_null(arg.name, argv[i]);
+ res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
+ }
+
if (res) {
const char *msg;
@@ -178,8 +204,13 @@ static int _cmd_device_remove(int argc, char **argv,
msg = btrfs_err_str(res);
else
msg = strerror(errno);
- error("error removing device '%s': %s",
- argv[i], msg);
+ if (is_devid) {
+ error("error removing devid %llu: %s",
+ (unsigned long long)argv2.devid, msg);
+ } else {
+ error("error removing device '%s': %s",
+ argv[i], msg);
+ }
ret++;
}
}
@@ -189,7 +220,7 @@ static int _cmd_device_remove(int argc, char **argv,
}
static const char * const cmd_device_remove_usage[] = {
- "btrfs device remove <device> [<device>...] <path>",
+ "btrfs device remove <device>|<devid> [<device>|<devid>...] <path>",
"Remove a device from a filesystem",
NULL
};
@@ -200,7 +231,7 @@ static int cmd_device_remove(int argc, char **argv)
}
static const char * const cmd_device_delete_usage[] = {
- "btrfs device delete <device> [<device>...] <path>",
+ "btrfs device delete <device>|<devid> [<device>|<devid>...] <path>",
"Remove a device from a filesystem",
NULL
};
diff --git a/ioctl.h b/ioctl.h
index 771da23160f3..cab9ec2d5501 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -45,6 +45,14 @@ struct btrfs_ioctl_vol_args {
#define BTRFS_SUBVOL_CREATE_ASYNC (1ULL << 0)
#define BTRFS_SUBVOL_RDONLY (1ULL << 1)
#define BTRFS_SUBVOL_QGROUP_INHERIT (1ULL << 2)
+#define BTRFS_DEVICE_SPEC_BY_ID (1ULL << 3)
+
+#define BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED \
+ (BTRFS_SUBVOL_CREATE_ASYNC | \
+ BTRFS_SUBVOL_RDONLY | \
+ BTRFS_SUBVOL_QGROUP_INHERIT | \
+ BTRFS_DEVICE_SPEC_BY_ID)
+
#define BTRFS_FSID_SIZE 16
#define BTRFS_UUID_SIZE 16
@@ -84,7 +92,10 @@ struct btrfs_ioctl_vol_args_v2 {
};
__u64 unused[4];
};
- char name[BTRFS_SUBVOL_NAME_MAX + 1];
+ union {
+ char name[BTRFS_SUBVOL_NAME_MAX + 1];
+ u64 devid;
+ };
};
/*
@@ -709,6 +720,8 @@ 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_v2)
#ifdef __cplusplus
}
#endif
--
2.7.0
--
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