Mitch Harder
2010-Nov-09 17:41 UTC
Btrfs-progs: add support for mixed data+metadata block groups V4
So alot of crazy people (I''m looking at you Meego) want to use btrfs
on phones and such with small devices. Unfortunately the way we split
out metadata/data chunks it makes space usage inefficient for volumes
that are smaller than 1gigabyte. So add a -M option for mixing
metadata+data, and default to this mixed mode if the filesystem is less
than or equal to 1 gigabyte. I''ve tested this with xfstests on a 100mb
filesystem and everything is a-ok.
Signed-off-by: Josef Bacik <josef@redhat.com>
---
V3->V4: Back out space_cache incompat references from a previous
testing patch that has been omitted.
V2->V3: Add an incompat flag since the kernel will panic with mixed
block groups unless its had a few key fixes.
V1->V2: My original patch was screwing up if you specified the data or
metadata profile. This update fixes that problem.
---
btrfs-vol.c | 4 +-
btrfs_cmds.c | 13 +++++-
ctree.h | 10 +++--
mkfs.c | 122 +++++++++++++++++++++++++++++++++++++++++-----------------
utils.c | 10 ++--
utils.h | 2 +-
6 files changed, 112 insertions(+), 49 deletions(-)
diff --git a/btrfs-vol.c b/btrfs-vol.c
index 4ed799d..f573023 100644
--- a/btrfs-vol.c
+++ b/btrfs-vol.c
@@ -143,7 +143,9 @@ int main(int ac, char **av)
exit(1);
}
if (cmd == BTRFS_IOC_ADD_DEV) {
- ret = btrfs_prepare_device(devfd, device, 1, &dev_block_count);
+ int mixed = 0;
+
+ ret = btrfs_prepare_device(devfd, device, 1, &dev_block_count,
&mixed);
if (ret) {
fprintf(stderr, "Unable to init %s\n", device);
exit(1);
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index f97bdf5..b1a4d8d 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -705,6 +705,7 @@ int do_add_volume(int nargs, char **args)
int devfd, res;
u64 dev_block_count = 0;
struct stat st;
+ int mixed = 0;
devfd = open(args[i], O_RDWR);
if (!devfd) {
@@ -727,7 +728,7 @@ int do_add_volume(int nargs, char **args)
continue;
}
- res = btrfs_prepare_device(devfd, args[i], 1, &dev_block_count);
+ res = btrfs_prepare_device(devfd, args[i], 1, &dev_block_count,
&mixed);
if (res) {
fprintf(stderr, "ERROR: Unable to init ''%s''\n",
args[i]);
close(devfd);
@@ -990,8 +991,14 @@ int do_df_filesystem(int nargs, char **argv)
memset(description, 0, 80);
if (flags & BTRFS_BLOCK_GROUP_DATA) {
- snprintf(description, 5, "%s", "Data");
- written += 4;
+ if (flags & BTRFS_BLOCK_GROUP_METADATA) {
+ snprintf(description, 15, "%s",
+ "Data+Metadata");
+ written += 14;
+ } else {
+ snprintf(description, 5, "%s", "Data");
+ written += 4;
+ }
} else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
snprintf(description, 7, "%s", "System");
written += 6;
diff --git a/ctree.h b/ctree.h
index b79e238..cd24670 100644
--- a/ctree.h
+++ b/ctree.h
@@ -350,13 +350,15 @@ struct btrfs_super_block {
* ones specified below then we will fail to mount
*/
#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
-#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (2ULL << 0)
+#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
+#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
-#define BTRFS_FEATURE_INCOMPAT_SUPP \
- (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
- BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)
+#define BTRFS_FEATURE_INCOMPAT_SUPP \
+ (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
+ BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
+ BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
/*
* A leaf is full of items. offset and size tell us where to find
diff --git a/mkfs.c b/mkfs.c
index 2e99b95..04de93a 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -69,7 +69,7 @@ static u64 parse_size(char *s)
return atol(s) * mult;
}
-static int make_root_dir(struct btrfs_root *root)
+static int make_root_dir(struct btrfs_root *root, int mixed)
{
struct btrfs_trans_handle *trans;
struct btrfs_key location;
@@ -88,30 +88,47 @@ static int make_root_dir(struct btrfs_root *root)
0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
BUG_ON(ret);
- ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
- &chunk_start, &chunk_size,
- BTRFS_BLOCK_GROUP_METADATA);
- BUG_ON(ret);
- ret = btrfs_make_block_group(trans, root, 0,
- BTRFS_BLOCK_GROUP_METADATA,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID,
- chunk_start, chunk_size);
- BUG_ON(ret);
+ if (mixed) {
+ ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
+ &chunk_start, &chunk_size,
+ BTRFS_BLOCK_GROUP_METADATA |
+ BTRFS_BLOCK_GROUP_DATA);
+ BUG_ON(ret);
+ ret = btrfs_make_block_group(trans, root, 0,
+ BTRFS_BLOCK_GROUP_METADATA |
+ BTRFS_BLOCK_GROUP_DATA,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ chunk_start, chunk_size);
+ BUG_ON(ret);
+ printf("Created a data/metadata chunk of size %llu\n", chunk_size);
+ } else {
+ ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
+ &chunk_start, &chunk_size,
+ BTRFS_BLOCK_GROUP_METADATA);
+ BUG_ON(ret);
+ ret = btrfs_make_block_group(trans, root, 0,
+ BTRFS_BLOCK_GROUP_METADATA,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ chunk_start, chunk_size);
+ BUG_ON(ret);
+ }
root->fs_info->system_allocs = 0;
btrfs_commit_transaction(trans, root);
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
- ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
- &chunk_start, &chunk_size,
- BTRFS_BLOCK_GROUP_DATA);
- BUG_ON(ret);
- ret = btrfs_make_block_group(trans, root, 0,
- BTRFS_BLOCK_GROUP_DATA,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID,
- chunk_start, chunk_size);
- BUG_ON(ret);
+ if (!mixed) {
+ ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
+ &chunk_start, &chunk_size,
+ BTRFS_BLOCK_GROUP_DATA);
+ BUG_ON(ret);
+ ret = btrfs_make_block_group(trans, root, 0,
+ BTRFS_BLOCK_GROUP_DATA,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ chunk_start, chunk_size);
+ BUG_ON(ret);
+ }
ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
BTRFS_ROOT_TREE_DIR_OBJECTID);
@@ -200,7 +217,7 @@ static int create_one_raid_group(struct btrfs_trans_handle
*trans,
static int create_raid_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 data_profile,
- u64 metadata_profile)
+ u64 metadata_profile, int mixed)
{
u64 num_devices =
btrfs_super_num_devices(&root->fs_info->super_copy);
u64 allowed;
@@ -215,20 +232,24 @@ static int create_raid_groups(struct btrfs_trans_handle
*trans,
allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
if (allowed & metadata_profile) {
+ u64 meta_flags = BTRFS_BLOCK_GROUP_METADATA;
+
ret = create_one_raid_group(trans, root,
BTRFS_BLOCK_GROUP_SYSTEM |
(allowed & metadata_profile));
BUG_ON(ret);
- ret = create_one_raid_group(trans, root,
- BTRFS_BLOCK_GROUP_METADATA |
+ if (mixed)
+ meta_flags |= BTRFS_BLOCK_GROUP_DATA;
+
+ ret = create_one_raid_group(trans, root, meta_flags |
(allowed & metadata_profile));
BUG_ON(ret);
ret = recow_roots(trans, root);
BUG_ON(ret);
}
- if (num_devices > 1 && (allowed & data_profile)) {
+ if (!mixed && num_devices > 1 && (allowed &
data_profile)) {
ret = create_one_raid_group(trans, root,
BTRFS_BLOCK_GROUP_DATA |
(allowed & data_profile));
@@ -274,6 +295,7 @@ static void print_usage(void)
fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
fprintf(stderr, "\t -L --label set a label\n");
fprintf(stderr, "\t -m --metadata metadata profile, values like data
profile\n");
+ fprintf(stderr, "\t -M --mixed mix metadata and data together\n");
fprintf(stderr, "\t -n --nodesize size of btree nodes\n");
fprintf(stderr, "\t -s --sectorsize min block allocation\n");
fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
@@ -328,6 +350,7 @@ static struct option long_options[] = {
{ "leafsize", 1, NULL, ''l'' },
{ "label", 1, NULL, ''L''},
{ "metadata", 1, NULL, ''m'' },
+ { "mixed", 0, NULL, ''M'' },
{ "nodesize", 1, NULL, ''n'' },
{ "sectorsize", 1, NULL, ''s'' },
{ "data", 1, NULL, ''d'' },
@@ -358,10 +381,13 @@ int main(int ac, char **av)
int first_fd;
int ret;
int i;
+ int mixed = 0;
+ int data_profile_opt = 0;
+ int metadata_profile_opt = 0;
while(1) {
int c;
- c = getopt_long(ac, av, "A:b:l:n:s:m:d:L:V", long_options,
+ c = getopt_long(ac, av, "A:b:l:n:s:m:d:L:VM", long_options,
&option_index);
if (c < 0)
break;
@@ -371,6 +397,7 @@ int main(int ac, char **av)
break;
case ''d'':
data_profile = parse_profile(optarg);
+ data_profile_opt = 1;
break;
case ''l'':
leafsize = parse_size(optarg);
@@ -380,6 +407,10 @@ int main(int ac, char **av)
break;
case ''m'':
metadata_profile = parse_profile(optarg);
+ metadata_profile_opt = 1;
+ break;
+ case ''M'':
+ mixed = 1;
break;
case ''n'':
nodesize = parse_size(optarg);
@@ -389,12 +420,10 @@ int main(int ac, char **av)
break;
case ''b'':
block_count = parse_size(optarg);
- if (block_count < 256*1024*1024) {
- fprintf(stderr, "File system size "
- "%llu bytes is too small, "
- "256M is required at least\n",
- (unsigned long long)block_count);
- exit(1);
+ if (block_count <= 1024*1024*1024) {
+ printf("SMALL VOLUME: forcing mixed "
+ "metadata/data groups\n");
+ mixed = 1;
}
zero_end = 0;
break;
@@ -439,9 +468,22 @@ int main(int ac, char **av)
}
first_fd = fd;
first_file = file;
- ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
+ ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
+ &mixed);
if (block_count == 0)
block_count = dev_block_count;
+ if (mixed) {
+ if (!metadata_profile_opt)
+ metadata_profile = 0;
+ if (!data_profile_opt)
+ data_profile = 0;
+
+ if (metadata_profile != data_profile) {
+ fprintf(stderr, "With mixed block groups data and metadata "
+ "profiles must be the same\n");
+ exit(1);
+ }
+ }
blocks[0] = BTRFS_SUPER_INFO_OFFSET;
for (i = 1; i < 7; i++) {
@@ -459,7 +501,7 @@ int main(int ac, char **av)
root = open_ctree(file, 0, O_RDWR);
root->fs_info->alloc_start = alloc_start;
- ret = make_root_dir(root);
+ ret = make_root_dir(root, mixed);
if (ret) {
fprintf(stderr, "failed to setup the root directory\n");
exit(1);
@@ -478,6 +520,8 @@ int main(int ac, char **av)
zero_end = 1;
while(ac-- > 0) {
+ int old_mixed = mixed;
+
file = av[optind++];
ret = check_mounted(file);
if (ret < 0) {
@@ -503,8 +547,8 @@ int main(int ac, char **av)
continue;
}
ret = btrfs_prepare_device(fd, file, zero_end,
- &dev_block_count);
-
+ &dev_block_count, &mixed);
+ mixed = old_mixed;
BUG_ON(ret);
ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
@@ -515,12 +559,20 @@ int main(int ac, char **av)
raid_groups:
ret = create_raid_groups(trans, root, data_profile,
- metadata_profile);
+ metadata_profile, mixed);
BUG_ON(ret);
ret = create_data_reloc_tree(trans, root);
BUG_ON(ret);
+ if (mixed) {
+ struct btrfs_super_block *super = &root->fs_info->super_copy;
+ u64 flags = btrfs_super_incompat_flags(super);
+
+ flags |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS;
+ btrfs_set_super_incompat_flags(super, flags);
+ }
+
printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
"sectorsize %u size %s\n",
label, first_file, nodesize, leafsize, sectorsize,
diff --git a/utils.c b/utils.c
index fd894f3..6f980b7 100644
--- a/utils.c
+++ b/utils.c
@@ -511,7 +511,8 @@ int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
return 0;
}
-int btrfs_prepare_device(int fd, char *file, int zero_end, u64
*block_count_ret)
+int btrfs_prepare_device(int fd, char *file, int zero_end, u64
*block_count_ret,
+ int *mixed)
{
u64 block_count;
u64 bytenr;
@@ -531,10 +532,9 @@ int btrfs_prepare_device(int fd, char *file, int zero_end,
u64 *block_count_ret)
}
zero_end = 1;
- if (block_count < 256 * 1024 * 1024) {
- fprintf(stderr, "device %s is too small "
- "(must be at least 256 MB)\n", file);
- exit(1);
+ if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
+ printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
+ *mixed = 1;
}
ret = zero_dev_start(fd);
if (ret) {
diff --git a/utils.h b/utils.h
index 9dce5b0..a28d7f4 100644
--- a/utils.h
+++ b/utils.h
@@ -27,7 +27,7 @@ int make_btrfs(int fd, const char *device, const char *label,
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 *block_count_ret, int *mixed);
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,
--
1.7.2.2
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Goffredo Baroncelli
2010-Nov-09 18:45 UTC
Re: Btrfs-progs: add support for mixed data+metadata block groups V4
On Tuesday, 09 November, 2010, Mitch Harder wrote:> So alot of crazy people (I''m looking at you Meego) want to use btrfs > on phones and such with small devices. Unfortunately the way we split > out metadata/data chunks it makes space usage inefficient for volumes > that are smaller than 1gigabyte. So add a -M option for mixing > metadata+data, and default to this mixed mode if the filesystem is less > than or equal to 1 gigabyte. I''ve tested this with xfstests on a 100mb > filesystem and everything is a-ok.[...]> @@ -274,6 +295,7 @@ static void print_usage(void) > fprintf(stderr, "\t -l --leafsize size of btree leaves\n"); > fprintf(stderr, "\t -L --label set a label\n"); > fprintf(stderr, "\t -m --metadata metadata profile, values like dataprofile\n");> + fprintf(stderr, "\t -M --mixed mix metadata and data together\n"); > fprintf(stderr, "\t -n --nodesize size of btree nodes\n"); > fprintf(stderr, "\t -s --sectorsize min block allocation\n"); > fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);Please, update the man page (mkfs.btrfs) page too with the new switch. Regards G.Baroncelli -- gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) <kreijack@inwind.it> Key fingerprint = 4769 7E51 5293 D36C 814E C054 BF04 F161 3DC5 0512 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html