Btrfs: Better block record keeping, real mkfs
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 636c63e..0720169 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -2,7 +2,7 @@
CFLAGS = -g -Wall -Werror
headers = radix-tree.h ctree.h disk-io.h kerncompat.h print-tree.h list.h \
transaction.h
-objects = ctree.o disk-io.o radix-tree.o mkfs.o extent-tree.o print-tree.o \
+objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
root-tree.o dir-item.o hash.o file-item.o inode-item.o \
inode-map.o \
@@ -16,7 +16,10 @@
$(check) $<
$(CC) $(CFLAGS) -c $<
-all: tester debug-tree quick-test dir-test tags
+all: tester debug-tree quick-test dir-test tags mkfs.btrfs
+
+mkfs.btrfs: $(objects) mkfs.o
+ gcc $(CFLAGS) -o mkfs.btrfs $(objects) mkfs.o
debug-tree: $(objects) debug-tree.o
gcc $(CFLAGS) -o debug-tree $(objects) debug-tree.o
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b30b2ce..1a4d1d6 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -223,6 +223,7 @@
int cache_size;
int fp;
struct btrfs_trans_handle *running_transaction;
+ struct btrfs_super_block *disk_super;
};
/*
diff --git a/fs/btrfs/debug-tree.c b/fs/btrfs/debug-tree.c
index d9f36ef..fd07969 100644
--- a/fs/btrfs/debug-tree.c
+++ b/fs/btrfs/debug-tree.c
@@ -10,8 +10,17 @@
int main(int ac, char **av) {
struct btrfs_super_block super;
struct btrfs_root *root;
+
+ if (ac != 2) {
+ fprintf(stderr, "usage: %s device\n", av[0]);
+ exit(1);
+ }
radix_tree_init();
- root = open_ctree("dbfile", &super);
+ root = open_ctree(av[1], &super);
+ if (!root) {
+ fprintf(stderr, "unable to open %s\n", av[1]);
+ exit(1);
+ }
printf("fs tree\n");
btrfs_print_tree(root, root->node);
printf("map tree\n");
@@ -23,5 +32,7 @@
printf("root tree\n");
btrfs_print_tree(root->fs_info->tree_root,
root->fs_info->tree_root->node);
+ printf("total blocks %Lu\n", btrfs_super_total_blocks(&super));
+ printf("blocks used %Lu\n", btrfs_super_blocks_used(&super));
return 0;
}
diff --git a/fs/btrfs/dir-test.c b/fs/btrfs/dir-test.c
index 8fc77c8..b673982a 100644
--- a/fs/btrfs/dir-test.c
+++ b/fs/btrfs/dir-test.c
@@ -425,8 +425,6 @@
struct btrfs_trans_handle *trans;
radix_tree_init();
- printf("removing old tree\n");
- unlink("dbfile");
root = open_ctree("dbfile", &super);
trans = btrfs_start_transaction(root, 1);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bacaa38..0322c55 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -293,20 +293,15 @@
fs_info->inode_root = inode_root;
fs_info->last_inode_alloc = 0;
fs_info->last_inode_alloc_dirid = 0;
+ fs_info->disk_super = super;
memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
ret = pread(fp, super, sizeof(struct btrfs_super_block),
BTRFS_SUPER_INFO_OFFSET);
if (ret == 0 || btrfs_super_root(super) == 0) {
- printf("making new FS!\n");
- ret = mkfs(fp, 0, 1024);
- if (ret)
- return NULL;
- ret = pread(fp, super, sizeof(struct btrfs_super_block),
- BTRFS_SUPER_INFO_OFFSET);
- if (ret != sizeof(struct btrfs_super_block))
- return NULL;
+ BUG();
+ return NULL;
}
BUG_ON(ret < 0);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 09eeeb4..9bc4ad3 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -134,6 +134,8 @@
struct btrfs_extent_item extent_item;
int i;
int ret;
+ u64 super_blocks_used;
+ struct btrfs_fs_info *info = extent_root->fs_info;
btrfs_set_extent_refs(&extent_item, 1);
btrfs_set_extent_owner(&extent_item,
@@ -145,6 +147,9 @@
for (i = 0; i < extent_root->fs_info->current_insert.flags; i++) {
ins.objectid = extent_root->fs_info->current_insert.objectid +
i;
+ super_blocks_used = btrfs_super_blocks_used(info->disk_super);
+ btrfs_set_super_blocks_used(info->disk_super,
+ super_blocks_used + 1);
ret = btrfs_insert_item(trans, extent_root, &ins, &extent_item,
sizeof(extent_item));
BUG_ON(ret);
@@ -161,7 +166,8 @@
{
struct btrfs_path path;
struct btrfs_key key;
- struct btrfs_root *extent_root = root->fs_info->extent_root;
+ struct btrfs_fs_info *info = root->fs_info;
+ struct btrfs_root *extent_root = info->extent_root;
int ret;
struct btrfs_extent_item *ei;
struct btrfs_key ins;
@@ -188,15 +194,18 @@
refs = btrfs_extent_refs(ei) - 1;
btrfs_set_extent_refs(ei, refs);
if (refs == 0) {
+ u64 super_blocks_used;
if (pin) {
int err;
radix_tree_preload(GFP_KERNEL);
- err = radix_tree_insert(
- &extent_root->fs_info->pinned_radix,
- blocknr, (void *)blocknr);
+ err = radix_tree_insert(&info->pinned_radix,
+ blocknr, (void *)blocknr);
BUG_ON(err);
radix_tree_preload_end();
}
+ super_blocks_used = btrfs_super_blocks_used(info->disk_super);
+ btrfs_set_super_blocks_used(info->disk_super,
+ super_blocks_used - num_blocks);
ret = btrfs_del_item(trans, extent_root, &path);
if (!pin && extent_root->fs_info->last_insert.objectid >
blocknr)
@@ -392,7 +401,9 @@
{
int ret;
int pending_ret;
- struct btrfs_root *extent_root = root->fs_info->extent_root;
+ u64 super_blocks_used;
+ struct btrfs_fs_info *info = root->fs_info;
+ struct btrfs_root *extent_root = info->extent_root;
struct btrfs_extent_item extent_item;
btrfs_set_extent_refs(&extent_item, 1);
@@ -413,6 +424,9 @@
if (ret)
return ret;
+ super_blocks_used = btrfs_super_blocks_used(info->disk_super);
+ btrfs_set_super_blocks_used(info->disk_super, super_blocks_used +
+ num_blocks);
ret = btrfs_insert_item(trans, extent_root, ins, &extent_item,
sizeof(extent_item));
diff --git a/fs/btrfs/mkfs.c b/fs/btrfs/mkfs.c
index 1cac5ab..f7efc8a 100644
--- a/fs/btrfs/mkfs.c
+++ b/fs/btrfs/mkfs.c
@@ -1,4 +1,8 @@
#define _XOPEN_SOURCE 500
+#ifndef __CHECKER__
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#endif
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
@@ -10,6 +14,17 @@
#include "ctree.h"
#include "disk-io.h"
+#ifdef __CHECKER__
+#define BLKGETSIZE64 0
+static inline int ioctl(int fd, int define, u64 *size) { return 0; }
+#endif
+
+#if 0
+#if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64)
+# define BLKGETSIZE64 _IOR(0x12, 114, __u64)
+#endif
+#endif
+
int mkfs(int fd, u64 num_blocks, u32 blocksize)
{
struct btrfs_super_block super;
@@ -27,7 +42,7 @@
strcpy((char *)(&super.magic), BTRFS_MAGIC);
btrfs_set_super_blocksize(&super, blocksize);
btrfs_set_super_total_blocks(&super, num_blocks);
- btrfs_set_super_blocks_used(&super, 0);
+ btrfs_set_super_blocks_used(&super, start_block + 5);
block = malloc(blocksize);
memset(block, 0, blocksize);
@@ -160,3 +175,81 @@
return -1;
return 0;
}
+
+u64 device_size(int fd, struct stat *st)
+{
+ u64 size;
+ if (S_ISREG(st->st_mode)) {
+ return st->st_size;
+ }
+ if (!S_ISBLK(st->st_mode)) {
+ return 0;
+ }
+ if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
+ return size;
+ }
+ return 0;
+}
+
+int main(int ac, char **av)
+{
+ char *file;
+ u64 block_count = 0;
+ int fd;
+ struct stat st;
+ int ret;
+ int i;
+ char *buf = malloc(4096);
+ if (ac >= 2) {
+ file = av[1];
+ if (ac == 3) {
+ block_count = atoi(av[2]);
+ if (!block_count) {
+ fprintf(stderr, "error finding block count\n");
+ exit(1);
+ }
+ }
+ } else {
+ fprintf(stderr, "usage: mkfs.btrfs file [block count]\n");
+ exit(1);
+ }
+ fd = open(file, O_RDWR);
+ if (fd < 0) {
+ fprintf(stderr, "unable to open %s\n", file);
+ exit(1);
+ }
+ ret = fstat(fd, &st);
+ if (ret < 0) {
+ fprintf(stderr, "unable to stat %s\n", file);
+ exit(1);
+ }
+ if (block_count == 0) {
+ block_count = device_size(fd, &st);
+ if (block_count == 0) {
+ fprintf(stderr, "unable to find %s size\n", file);
+ exit(1);
+ }
+ }
+ block_count /= 4096;
+ if (block_count < 256) {
+ fprintf(stderr, "device %s is too small\n", file);
+ exit(1);
+ }
+ memset(buf, 0, 4096);
+ for(i = 0; i < 6; i++) {
+ ret = write(fd, buf, 4096);
+ if (ret != 4096) {
+ fprintf(stderr, "unable to zero fill device\n");
+ exit(1);
+ }
+ }
+ ret = mkfs(fd, block_count, 4096);
+ if (ret) {
+ fprintf(stderr, "error during mkfs %d\n", ret);
+ exit(1);
+ }
+ printf("fs created on %s blocksize %d blocks %Lu\n",
+ file, 4096, block_count);
+ return 0;
+}
+