When creating small Btrfs filesystem instances (i.e. filesystem size <= 1GiB), mkfs.btrfs fails if both sectorsize and nodesize are specified on the command line and sectorsize != nodesize, since mixed block groups involves both data and metadata blocks sharing the same block group. This is an incorrect behavior when '-M' option isn't specified on the command line.
This commit makes optional the creation of mixed block groups i.e. Mixed block groups are created only when -M option is specified on the command line. While at it, this commit fixes a bug which allowed creation of filesystem instances with "mixed block group" feature enabled and having differing block sizes for data and metadata. For e.g. [root@localhost btrfs-progs]# ./mkfs.btrfs -f -M -s 4096 -n 16384 /dev/loop6 SMALL VOLUME: forcing mixed metadata/data groups btrfs-progs v3.19-rc2-404-g71f7308 See http://btrfs.wiki.kernel.org for more information. Performing full device TRIM (4.00GiB) ... Label: (null) UUID: c82b5720-6d88-4fa1-ac05-d0d4cb797fd5 Node size: 16384 Sector size: 4096 Filesystem size: 4.00GiB Block group profiles: Data+Metadata: single 8.00MiB System: single 4.00MiB SSD detected: no Incompat features: mixed-bg, extref, skinny-metadata Number of devices: 1 Devices: ID SIZE PATH 1 4.00GiB /dev/loop6 Signed-off-by: Chandan Rajendra <chan...@linux.vnet.ibm.com> --- cmds-device.c | 3 +-- cmds-replace.c | 3 +-- mkfs.c | 45 ++++++++++++++++++++------------------------- utils.c | 5 +---- utils.h | 2 +- 5 files changed, 24 insertions(+), 34 deletions(-) diff --git a/cmds-device.c b/cmds-device.c index 5f2b952..1b601cf 100644 --- a/cmds-device.c +++ b/cmds-device.c @@ -92,7 +92,6 @@ static int cmd_device_add(int argc, char **argv) struct btrfs_ioctl_vol_args ioctl_args; int devfd, res; u64 dev_block_count = 0; - int mixed = 0; char *path; res = test_dev_for_mkfs(argv[i], force); @@ -109,7 +108,7 @@ static int cmd_device_add(int argc, char **argv) } res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count, - 0, &mixed, discard); + 0, discard); close(devfd); if (res) { ret++; diff --git a/cmds-replace.c b/cmds-replace.c index 9ab8438..e944457 100644 --- a/cmds-replace.c +++ b/cmds-replace.c @@ -140,7 +140,6 @@ static int cmd_replace_start(int argc, char **argv) int force_using_targetdev = 0; u64 dstdev_block_count; int do_not_background = 0; - int mixed = 0; DIR *dirstream = NULL; u64 srcdev_size; u64 dstdev_size; @@ -281,7 +280,7 @@ static int cmd_replace_start(int argc, char **argv) strncpy((char *)start_args.start.tgtdev_name, dstdev, BTRFS_DEVICE_PATH_NAME_MAX); ret = btrfs_prepare_device(fddstdev, dstdev, 1, &dstdev_block_count, 0, - &mixed, 0); + 0); if (ret) goto leave_with_error; diff --git a/mkfs.c b/mkfs.c index a5802f7..10016b2 100644 --- a/mkfs.c +++ b/mkfs.c @@ -152,7 +152,7 @@ err: } static int make_root_dir(struct btrfs_trans_handle *trans, struct btrfs_root *root, - int mixed, struct mkfs_allocation *allocation) + struct mkfs_allocation *allocation) { struct btrfs_key location; int ret; @@ -1440,8 +1440,6 @@ int main(int ac, char **av) break; case 'b': block_count = parse_size(optarg); - if (block_count <= BTRFS_MKFS_SMALL_VOLUME_SIZE) - mixed = 1; zero_end = 0; break; case 'V': @@ -1491,7 +1489,7 @@ int main(int ac, char **av) exit(1); } } - + while (dev_cnt-- > 0) { file = av[optind++]; if (is_block_device(file) == 1) @@ -1505,10 +1503,9 @@ int main(int ac, char **av) file = av[optind++]; ssd = is_ssd(file); - if (is_vol_small(file) || mixed) { + if (mixed) { if (verbose) - printf("SMALL VOLUME: forcing mixed metadata/data groups\n"); - mixed = 1; + printf("Forcing mixed metadata/data groups\n"); } /* @@ -1544,6 +1541,19 @@ int main(int ac, char **av) if (!nodesize_forced) nodesize = best_nodesize; } + + /* + * FS features that can be set by other means than -O + * just set the bit here + */ + if (mixed) + features |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS; + + if ((data_profile | metadata_profile) & + (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) { + features |= BTRFS_FEATURE_INCOMPAT_RAID56; + } + if (btrfs_check_nodesize(nodesize, sectorsize, features)) exit(1); @@ -1604,7 +1614,7 @@ int main(int ac, char **av) exit(1); } ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count, - block_count, &mixed, discard); + block_count, discard); if (ret) { close(fd); exit(1); @@ -1651,18 +1661,6 @@ int main(int ac, char **av) "WARNING: metatdata has lower redundancy than data!\n\n"); } - /* - * FS features that can be set by other means than -O - * just set the bit here - */ - if (mixed) - features |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS; - - if ((data_profile | metadata_profile) & - (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) { - features |= BTRFS_FEATURE_INCOMPAT_RAID56; - } - mkfs_cfg.label = label; mkfs_cfg.fs_uuid = fs_uuid; memcpy(mkfs_cfg.blocks, blocks, sizeof(blocks)); @@ -1704,7 +1702,7 @@ int main(int ac, char **av) exit(1); } - ret = make_root_dir(trans, root, mixed, &allocation); + ret = make_root_dir(trans, root, &allocation); if (ret) { fprintf(stderr, "failed to setup the root directory\n"); exit(1); @@ -1725,8 +1723,6 @@ int main(int ac, char **av) goto raid_groups; while (dev_cnt-- > 0) { - int old_mixed = mixed; - file = av[optind++]; /* @@ -1749,12 +1745,11 @@ int main(int ac, char **av) continue; } ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count, - block_count, &mixed, discard); + block_count, discard); if (ret) { close(fd); exit(1); } - mixed = old_mixed; ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count, sectorsize, sectorsize, sectorsize); diff --git a/utils.c b/utils.c index f1e3248..269b510 100644 --- a/utils.c +++ b/utils.c @@ -847,7 +847,7 @@ out: } int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret, - u64 max_block_count, int *mixed, int discard) + u64 max_block_count, int discard) { u64 block_count; struct stat st; @@ -867,9 +867,6 @@ int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret, if (max_block_count) block_count = min(block_count, max_block_count); - if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed)) - *mixed = 1; - if (discard) { /* * We intentionally ignore errors from the discard ioctl. It diff --git a/utils.h b/utils.h index 192f3d1..2e8293d 100644 --- a/utils.h +++ b/utils.h @@ -120,7 +120,7 @@ int make_btrfs(int fd, struct btrfs_mkfs_config *cfg); int btrfs_make_root_dir(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 objectid); int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret, - u64 max_block_count, int *mixed, int discard); + u64 max_block_count, int discard); int btrfs_add_to_fsid(struct btrfs_trans_handle *trans, struct btrfs_root *root, int fd, char *path, u64 block_count, u32 io_width, u32 io_align, -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
