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Btrfs: Better block record keeping, real mkfs 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-03-20 20:35:03 -04:00 committed by David Woodhouse
parent 293ffd5fd3
commit 1261ec42b3
7 changed files with 134 additions and 19 deletions
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7
fs/btrfs/Makefile
View File

@ -2,7 +2,7 @@ CC=gcc
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=sparse $(CHECKFLAGS)
$(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

1
fs/btrfs/ctree.h
View File

@ -223,6 +223,7 @@ struct btrfs_fs_info {
int cache_size;
int fp;
struct btrfs_trans_handle *running_transaction;
struct btrfs_super_block *disk_super;
};
/*

13
fs/btrfs/debug-tree.c
View File

@ -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 @@ int main(int ac, char **av) {
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;
}

2
fs/btrfs/dir-test.c
View File

@ -425,8 +425,6 @@ int main(int ac, char **av)
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);

9
fs/btrfs/disk-io.c
View File

@ -293,19 +293,14 @@ struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *super)
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))
BUG();
return NULL;
}
BUG_ON(ret < 0);

22
fs/btrfs/extent-tree.c
View File

@ -134,6 +134,8 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
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 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
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 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
{
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 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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,
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 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
{
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 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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));

95
fs/btrfs/mkfs.c
View File

@ -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 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
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 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
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;
}