From 2490de5da527969a9178418155120bf50f2a8421 Mon Sep 17 00:00:00 2001 From: Anand Jain Date: Mon, 14 Mar 2016 16:31:49 +0800 Subject: [PATCH] btrfs-progs: Introduce device delete by devid This patch introduces new option for the command btrfs device delete [..] 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 Signed-off-by: David Sterba --- 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 d6d55afd..edd9b98e 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* [...] :: +*remove* | [|...] :: Remove device(s) from a filesystem identified by . -*delete* [...] :: +*delete* | [|...] :: Alias of remove kept for backward compatibility *ready* :: diff --git a/cmds-device.c b/cmds-device.c index 9906d4a3..b17b6c6f 100644 --- a/cmds-device.c +++ b/cmds-device.c @@ -159,20 +159,46 @@ static int _cmd_device_remove(int argc, char **argv, for(i = optind; 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 doesn'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; @@ -180,8 +206,13 @@ 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++; } } @@ -191,7 +222,7 @@ static int _cmd_device_remove(int argc, char **argv, } static const char * const cmd_device_remove_usage[] = { - "btrfs device remove [...] ", + "btrfs device remove | [|...] ", "Remove a device from a filesystem", NULL }; @@ -202,7 +233,7 @@ static int cmd_device_remove(int argc, char **argv) } static const char * const cmd_device_delete_usage[] = { - "btrfs device delete [...] ", + "btrfs device delete | [|...] ", "Remove a device from a filesystem", NULL }; diff --git a/ioctl.h b/ioctl.h index 771da231..cab9ec2d 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