* [PATCH V2] btrfs-progs: Add new feature to mkfs.btrfs to make file system image file from source directory
@ 2010-07-08 9:17 Donggeun Kim
0 siblings, 0 replies; only message in thread
From: Donggeun Kim @ 2010-07-08 9:17 UTC (permalink / raw)
To: linux-btrfs; +Cc: kyungmin.park, chris.mason
Changes from V1 to V2:
- support extended attributes
- move btrfs_alloc_data_chunk function to volumes.c
- fix an execution error when additional useless parameters are specified
- fix traverse_directory function so that the insertion functions for the common items are invoked in a single point
The extended attributes is implemented through llistxattr and getxattr function calls.
Thanks
Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
mkfs.c | 865 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
volumes.c | 104 ++++++++
volumes.h | 3 +
3 files changed, 948 insertions(+), 24 deletions(-)
diff --git a/mkfs.c b/mkfs.c
index 2e99b95..1d403f6 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -29,12 +29,14 @@
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/dir.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <uuid/uuid.h>
#include <linux/fs.h>
#include <ctype.h>
+#include <attr/xattr.h>
#include "kerncompat.h"
#include "ctree.h"
#include "disk-io.h"
@@ -43,6 +45,15 @@
#include "utils.h"
#include "version.h"
+static u64 index_cnt = 2;
+
+struct directory_name_entry {
+ char *dir_name;
+ char *path;
+ ino_t inum;
+ struct list_head list;
+};
+
static u64 parse_size(char *s)
{
int len = strlen(s);
@@ -276,6 +287,7 @@ static void print_usage(void)
fprintf(stderr, "\t -m --metadata metadata profile, values like data profile\n");
fprintf(stderr, "\t -n --nodesize size of btree nodes\n");
fprintf(stderr, "\t -s --sectorsize min block allocation\n");
+ fprintf(stderr, "\t -r --rootdir the source directory\n");
fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
exit(1);
}
@@ -332,9 +344,768 @@ static struct option long_options[] = {
{ "sectorsize", 1, NULL, 's' },
{ "data", 1, NULL, 'd' },
{ "version", 0, NULL, 'V' },
+ { "rootdir", 1, NULL, 'r' },
{ 0, 0, 0, 0}
};
+static int add_directory_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 objectid,
+ ino_t parent_inum, const char *name,
+ struct stat *st, int *dir_index_cnt)
+{
+ int ret;
+ int name_len;
+ struct btrfs_key location;
+ u8 filetype = 0;
+
+ name_len = strlen(name);
+
+ location.objectid = objectid;
+ location.offset = 0;
+ btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
+
+ if (S_ISDIR(st->st_mode))
+ filetype = BTRFS_FT_DIR;
+ if (S_ISREG(st->st_mode))
+ filetype = BTRFS_FT_REG_FILE;
+ if (S_ISLNK(st->st_mode))
+ filetype = BTRFS_FT_SYMLINK;
+
+ ret = btrfs_insert_dir_item(trans, root, name, name_len,
+ parent_inum, &location,
+ filetype, index_cnt);
+
+ *dir_index_cnt = index_cnt;
+ index_cnt++;
+
+ return ret;
+}
+
+static int fill_inode_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_inode_item *dst, struct stat *src)
+{
+ u64 blocks = 0;
+ u64 sectorsize = root->sectorsize;
+
+ btrfs_set_stack_inode_generation(dst, trans->transid);
+ btrfs_set_stack_inode_size(dst, src->st_size);
+ btrfs_set_stack_inode_nbytes(dst, 0);
+ btrfs_set_stack_inode_block_group(dst, 0);
+ btrfs_set_stack_inode_nlink(dst, src->st_nlink);
+ btrfs_set_stack_inode_uid(dst, src->st_uid);
+ btrfs_set_stack_inode_gid(dst, src->st_gid);
+ btrfs_set_stack_inode_mode(dst, src->st_mode);
+ btrfs_set_stack_inode_rdev(dst, 0);
+ btrfs_set_stack_inode_flags(dst, 0);
+ btrfs_set_stack_timespec_sec(&dst->atime, src->st_atime);
+ btrfs_set_stack_timespec_nsec(&dst->atime, 0);
+ btrfs_set_stack_timespec_sec(&dst->ctime, src->st_ctime);
+ btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
+ btrfs_set_stack_timespec_sec(&dst->mtime, src->st_mtime);
+ btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
+ btrfs_set_stack_timespec_sec(&dst->otime, 0);
+ btrfs_set_stack_timespec_nsec(&dst->otime, 0);
+
+ if (S_ISDIR(src->st_mode)) {
+ btrfs_set_stack_inode_size(dst, 0);
+ btrfs_set_stack_inode_nlink(dst, 1);
+ }
+ if (S_ISREG(src->st_mode)) {
+ btrfs_set_stack_inode_size(dst, (u64)src->st_size);
+ if (src->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root))
+ btrfs_set_stack_inode_nbytes(dst, src->st_size);
+ else {
+ blocks = src->st_size / sectorsize;
+ if (src->st_size % sectorsize)
+ blocks += 1;
+ blocks *= sectorsize;
+ btrfs_set_stack_inode_nbytes(dst, blocks);
+ }
+ }
+ if (S_ISLNK(src->st_mode))
+ btrfs_set_stack_inode_nbytes(dst, src->st_size + 1);
+
+ return 0;
+}
+
+static int directory_select(const struct direct *entry)
+{
+ if ((strncmp(entry->d_name, ".", entry->d_reclen) == 0) ||
+ (strncmp(entry->d_name, "..", entry->d_reclen) == 0))
+ return 0;
+ else
+ return 1;
+}
+
+static u64 calculate_dir_inode_size(char *dirname)
+{
+ int count, i;
+ struct direct **files, *cur_file;
+ u64 dir_inode_size = 0;
+
+ count = scandir(dirname, &files, directory_select, NULL);
+
+ for (i = 0; i < count; i++) {
+ cur_file = files[i];
+ dir_inode_size += strlen(cur_file->d_name);
+ }
+
+ dir_inode_size *= 2;
+ return dir_inode_size;
+}
+
+static int add_inode_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct stat *st, char *name,
+ u64 self_objectid, ino_t parent_inum,
+ int dir_index_cnt, struct btrfs_inode_item *inode_ret)
+{
+ int ret;
+ struct btrfs_key inode_key;
+ struct btrfs_inode_item btrfs_inode;
+ u64 objectid;
+ u64 inode_size = 0;
+ int name_len;
+
+ name_len = strlen(name);
+ fill_inode_item(trans, root, &btrfs_inode, st);
+ objectid = self_objectid;
+
+ if (S_ISDIR(st->st_mode)) {
+ inode_size = calculate_dir_inode_size(name);
+ btrfs_set_stack_inode_size(&btrfs_inode, inode_size);
+ }
+
+ inode_key.objectid = objectid;
+ inode_key.offset = 0;
+ btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
+
+ ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
+ if (ret)
+ goto fail;
+
+ ret = btrfs_insert_inode_ref(trans, root, name, name_len,
+ objectid, parent_inum, dir_index_cnt);
+ if (ret)
+ goto fail;
+
+ *inode_ret = btrfs_inode;
+fail:
+ return ret;
+}
+
+static int add_xattr_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 objectid,
+ const char *file_name)
+{
+ int ret;
+ int cur_name_len;
+ char xattr_list[XATTR_LIST_MAX];
+ char *cur_name;
+ char cur_value[XATTR_SIZE_MAX];
+ char delimiter = '\0';
+ char *next_location = xattr_list;
+
+ ret = llistxattr(file_name, xattr_list, XATTR_LIST_MAX);
+ if (ret < 0) {
+ fprintf(stderr, "get a list of xattr failed for %s\n",
+ file_name);
+ return ret;
+ }
+ if (ret == 0)
+ return ret;
+
+ cur_name = strtok(xattr_list, &delimiter);
+ while (cur_name != NULL) {
+ cur_name_len = strlen(cur_name);
+ next_location += cur_name_len + 1;
+
+ ret = getxattr(file_name, cur_name, cur_value, XATTR_SIZE_MAX);
+ if (ret < 0) {
+ fprintf(stderr, "get a xattr value failed for %s\n",
+ cur_name);
+ }
+
+ ret = btrfs_insert_xattr_item(trans, root, cur_name,
+ cur_name_len, cur_value,
+ ret, objectid);
+ if (ret) {
+ fprintf(stderr, "insert a xattr item failed for %s\n",
+ file_name);
+ }
+
+ cur_name = strtok(next_location, &delimiter);
+ }
+
+ return ret;
+}
+
+static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
+ u64 hint_byte, struct btrfs_key *ins)
+{
+ u64 start;
+ u64 end;
+ u64 last = hint_byte;
+ int ret;
+ int wrapped = 0;
+ struct btrfs_block_group_cache *cache;
+
+ while (1) {
+ ret = find_first_extent_bit(&root->fs_info->free_space_cache,
+ last, &start, &end, EXTENT_DIRTY);
+ if (ret) {
+ if (wrapped++ == 0) {
+ last = 0;
+ continue;
+ } else {
+ goto fail;
+ }
+ }
+
+ start = max(last, start);
+ last = end + 1;
+ if (last - start < num_bytes)
+ continue;
+
+ last = start + num_bytes;
+ if (test_range_bit(&root->fs_info->pinned_extents,
+ start, last - 1, EXTENT_DIRTY, 0))
+ continue;
+
+ cache = btrfs_lookup_block_group(root->fs_info, start);
+ BUG_ON(!cache);
+ if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
+ last > cache->key.objectid + cache->key.offset) {
+ last = cache->key.objectid + cache->key.offset;
+ continue;
+ }
+
+ if (cache->flags & (BTRFS_BLOCK_GROUP_SYSTEM |
+ BTRFS_BLOCK_GROUP_METADATA)) {
+ last = cache->key.objectid + cache->key.offset;
+ continue;
+ }
+
+ clear_extent_dirty(&root->fs_info->free_space_cache,
+ start, start + num_bytes - 1, 0);
+
+ ins->objectid = start;
+ ins->offset = num_bytes;
+ ins->type = BTRFS_EXTENT_ITEM_KEY;
+ return 0;
+ }
+fail:
+ fprintf(stderr, "not enough free space\n");
+ return -ENOSPC;
+}
+
+static int record_file_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 objectid,
+ struct btrfs_inode_item *inode,
+ u64 file_pos, u64 disk_bytenr,
+ u64 num_bytes)
+{
+ int ret;
+ struct btrfs_fs_info *info = root->fs_info;
+ struct btrfs_root *extent_root = info->extent_root;
+ struct extent_buffer *leaf;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_key ins_key;
+ struct btrfs_path path;
+ struct btrfs_extent_item *ei;
+
+ btrfs_init_path(&path);
+
+ ins_key.objectid = objectid;
+ ins_key.offset = 0;
+ btrfs_set_key_type(&ins_key, BTRFS_EXTENT_DATA_KEY);
+ ret = btrfs_insert_empty_item(trans, root, &path, &ins_key,
+ sizeof(*fi));
+ if (ret)
+ goto fail;
+ leaf = path.nodes[0];
+ fi = btrfs_item_ptr(leaf, path.slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(leaf, fi, trans->transid);
+ btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
+ btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
+ btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes);
+ btrfs_set_file_extent_offset(leaf, fi, 0);
+ btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
+ btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
+ btrfs_set_file_extent_compression(leaf, fi, 0);
+ btrfs_set_file_extent_encryption(leaf, fi, 0);
+ btrfs_set_file_extent_other_encoding(leaf, fi, 0);
+ btrfs_mark_buffer_dirty(leaf);
+
+ btrfs_release_path(root, &path);
+
+ ins_key.objectid = disk_bytenr;
+ ins_key.offset = num_bytes;
+ ins_key.type = BTRFS_EXTENT_ITEM_KEY;
+
+ ret = btrfs_insert_empty_item(trans, extent_root, &path,
+ &ins_key, sizeof(*ei));
+ if (ret == 0) {
+ leaf = path.nodes[0];
+ ei = btrfs_item_ptr(leaf, path.slots[0],
+ struct btrfs_extent_item);
+
+ btrfs_set_extent_refs(leaf, ei, 0);
+ btrfs_set_extent_generation(leaf, ei, trans->transid);
+ btrfs_set_extent_flags(leaf, ei, BTRFS_EXTENT_FLAG_DATA);
+
+ btrfs_mark_buffer_dirty(leaf);
+ ret = btrfs_update_block_group(trans, root, disk_bytenr,
+ num_bytes, 1, 0);
+ if (ret)
+ goto fail;
+ } else if (ret != -EEXIST) {
+ goto fail;
+ }
+
+ ret = btrfs_inc_extent_ref(trans, root, disk_bytenr, num_bytes, 0,
+ root->root_key.objectid,
+ objectid, 0);
+fail:
+ btrfs_release_path(root, &path);
+ return ret;
+}
+
+static int add_symbolic_link(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 objectid, const char *path_name)
+{
+ int ret;
+ u64 sectorsize = root->sectorsize;
+ char *buf = malloc(sectorsize);
+
+ ret = readlink(path_name, buf, sectorsize);
+ if (ret <= 0) {
+ fprintf(stderr, "readlink failed for %s\n", path_name);
+ goto fail;
+ }
+ if (ret > sectorsize) {
+ fprintf(stderr, "symlink too long for %s", path_name);
+ ret = -1;
+ goto fail;
+ }
+ ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
+ buf, ret + 1);
+fail:
+ free(buf);
+ return ret;
+}
+
+static int add_file_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_inode_item *btrfs_inode, u64 objectid,
+ ino_t parent_inum, struct stat *st,
+ const char *path_name, int out_fd)
+{
+ int ret;
+ ssize_t ret_read;
+ u64 bytes_read = 0;
+ char *buffer = NULL;
+ struct btrfs_key key;
+ int blocks;
+ u32 sectorsize = root->sectorsize;
+ u64 first_block = 0;
+ u64 num_blocks = 0;
+ int fd;
+
+ fd = open(path_name, O_RDONLY);
+ if (fd == -1) {
+ fprintf(stderr, "%s open failed\n", path_name);
+ goto end;
+ }
+
+ blocks = st->st_size / sectorsize;
+ if (st->st_size % sectorsize)
+ blocks += 1;
+
+ if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
+ buffer = malloc(st->st_size);
+ ret_read = pread64(fd, buffer, st->st_size, bytes_read);
+ if (ret_read == -1) {
+ fprintf(stderr, "%s read failed\n", path_name);
+ goto end;
+ }
+
+ ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
+ buffer, st->st_size);
+ goto end;
+ }
+
+ ret = custom_alloc_extent(root, blocks * sectorsize, 0, &key);
+ if (ret)
+ goto end;
+
+ first_block = key.objectid;
+ bytes_read = 0;
+ buffer = malloc(sectorsize);
+
+ do {
+ memset(buffer, 0, sectorsize);
+ ret_read = pread64(fd, buffer, sectorsize, bytes_read);
+ if (ret_read == -1) {
+ fprintf(stderr, "%s read failed\n", path_name);
+ goto end;
+ }
+
+ ret = pwrite64(out_fd, buffer, sectorsize,
+ first_block + bytes_read);
+ if (ret != sectorsize) {
+ fprintf(stderr, "output file write failed\n");
+ goto end;
+ }
+
+ /* checksum for file data */
+ ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
+ first_block + (blocks * sectorsize),
+ first_block + bytes_read,
+ buffer, sectorsize);
+ if (ret) {
+ fprintf(stderr, "%s checksum failed\n", path_name);
+ goto end;
+ }
+
+ bytes_read += ret_read;
+ num_blocks++;
+ } while (ret_read == sectorsize);
+
+ if (num_blocks > 0) {
+ ret = record_file_extent(trans, root, objectid, btrfs_inode,
+ first_block, first_block,
+ blocks * sectorsize);
+ if (ret)
+ goto end;
+ }
+
+end:
+ if (buffer)
+ free(buffer);
+ close(fd);
+ return ret;
+}
+
+static char *make_path(char *dir, char *name)
+{
+ char *path;
+
+ path = malloc(strlen(dir) + strlen(name) + 2);
+ if (!path)
+ return NULL;
+ strcpy(path, dir);
+ if (dir[strlen(dir) - 1] != '/')
+ strcat(path, "/");
+ strcat(path, name);
+ return path;
+}
+
+static int traverse_directory(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, char *dir_name,
+ struct directory_name_entry *dir_head, int out_fd)
+{
+ int ret = 0;
+
+ struct btrfs_inode_item cur_inode;
+ struct btrfs_inode_item *inode_item;
+ int count, i, dir_index_cnt;
+ struct direct **files;
+ struct stat st;
+ struct directory_name_entry *dir_entry, *parent_dir_entry;
+ struct direct *cur_file;
+ ino_t parent_inum, cur_inum;
+ ino_t highest_inum = 0;
+ char *parent_dir_name;
+ struct btrfs_path path;
+ struct extent_buffer *leaf;
+ struct btrfs_key root_dir_key;
+ u64 root_dir_inode_size = 0;
+
+ /* Add list for source directory */
+ dir_entry = malloc(sizeof(struct directory_name_entry));
+ dir_entry->dir_name = dir_name;
+ dir_entry->path = malloc(strlen(dir_name) + 1);
+ strcpy(dir_entry->path, dir_name);
+
+ parent_inum = highest_inum + BTRFS_FIRST_FREE_OBJECTID;
+ dir_entry->inum = parent_inum;
+ list_add_tail(&dir_entry->list, &dir_head->list);
+
+ btrfs_init_path(&path);
+
+ root_dir_key.objectid = btrfs_root_dirid(&root->root_item);
+ root_dir_key.offset = 0;
+ btrfs_set_key_type(&root_dir_key, BTRFS_INODE_ITEM_KEY);
+ ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
+ if (ret) {
+ fprintf(stderr, "root dir lookup error\n");
+ goto fail;
+ }
+
+ leaf = path.nodes[0];
+ inode_item = btrfs_item_ptr(leaf, path.slots[0],
+ struct btrfs_inode_item);
+
+ root_dir_inode_size = calculate_dir_inode_size(dir_name);
+ btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size);
+ btrfs_mark_buffer_dirty(leaf);
+
+ btrfs_release_path(root, &path);
+
+ do {
+ parent_dir_entry = list_entry(dir_head->list.next,
+ struct directory_name_entry,
+ list);
+ list_del(&parent_dir_entry->list);
+
+ parent_inum = parent_dir_entry->inum;
+ parent_dir_name = parent_dir_entry->dir_name;
+ if (chdir(parent_dir_entry->path)) {
+ fprintf(stderr, "chdir error for %s\n",
+ parent_dir_name);
+ goto fail;
+ }
+
+ count = scandir(parent_dir_entry->path, &files,
+ directory_select, NULL);
+
+ for (i = 0; i < count; i++) {
+ cur_file = files[i];
+
+ if (lstat(cur_file->d_name, &st) == -1) {
+ fprintf(stderr, "lstat failed for file %s\n",
+ cur_file->d_name);
+ goto fail;
+ }
+
+ cur_inum = ++highest_inum + BTRFS_FIRST_FREE_OBJECTID;
+ ret = add_directory_items(trans, root,
+ cur_inum, parent_inum,
+ cur_file->d_name,
+ &st, &dir_index_cnt);
+ if (ret) {
+ fprintf(stderr, "add_directory_items failed\n");
+ goto fail;
+ }
+
+ ret = add_inode_items(trans, root, &st,
+ cur_file->d_name, cur_inum,
+ parent_inum, dir_index_cnt,
+ &cur_inode);
+ if (ret) {
+ fprintf(stderr, "add_inode_items failed\n");
+ goto fail;
+ }
+
+ ret = add_xattr_item(trans, root,
+ cur_inum, cur_file->d_name);
+ if (ret) {
+ fprintf(stderr, "add_xattr_item failed\n");
+ goto fail;
+ }
+
+ if (S_ISDIR(st.st_mode)) {
+ dir_entry = malloc(sizeof(struct directory_name_entry));
+ dir_entry->dir_name = cur_file->d_name;
+ dir_entry->path = make_path(parent_dir_entry->path,
+ cur_file->d_name);
+ dir_entry->inum = cur_inum;
+ list_add_tail(&dir_entry->list, &dir_head->list);
+ } else if (S_ISREG(st.st_mode)) {
+ ret = add_file_items(trans, root, &cur_inode,
+ cur_inum, parent_inum, &st,
+ cur_file->d_name, out_fd);
+ if (ret) {
+ fprintf(stderr, "add_file_items failed\n");
+ goto fail;
+ }
+ } else if (S_ISLNK(st.st_mode)) {
+ ret = add_symbolic_link(trans, root,
+ cur_inum, cur_file->d_name);
+ if (ret) {
+ fprintf(stderr, "add_symbolic_link failed\n");
+ goto fail;
+ }
+ }
+ }
+
+ free(parent_dir_entry->path);
+ free(parent_dir_entry);
+
+ index_cnt = 2;
+
+ } while (!list_empty(&dir_head->list));
+
+ return 0;
+fail:
+ free(parent_dir_entry->path);
+ free(parent_dir_entry);
+ return -1;
+}
+
+static int open_target(char *output_name)
+{
+ int output_fd;
+ output_fd = open(output_name, O_CREAT | O_RDWR | O_TRUNC,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
+
+ return output_fd;
+}
+
+static int create_chunks(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 num_of_meta_chunks,
+ u64 size_of_data)
+{
+ u64 chunk_start;
+ u64 chunk_size;
+ u64 meta_type = BTRFS_BLOCK_GROUP_METADATA;
+ u64 data_type = BTRFS_BLOCK_GROUP_DATA;
+ u64 minimum_data_chunk_size = 64 * 1024 * 1024;
+ u64 i;
+ int ret;
+
+ for (i = 0; i < num_of_meta_chunks; i++) {
+ ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
+ &chunk_start, &chunk_size, meta_type);
+ BUG_ON(ret);
+ ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
+ meta_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ chunk_start, chunk_size);
+ BUG_ON(ret);
+ set_extent_dirty(&root->fs_info->free_space_cache,
+ chunk_start, chunk_start + chunk_size - 1, 0);
+ }
+
+ if (size_of_data < minimum_data_chunk_size)
+ size_of_data = minimum_data_chunk_size;
+ ret = btrfs_alloc_data_chunk(trans, root->fs_info->extent_root,
+ &chunk_start, size_of_data, data_type);
+ BUG_ON(ret);
+ ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
+ data_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ chunk_start, size_of_data);
+ BUG_ON(ret);
+ set_extent_dirty(&root->fs_info->free_space_cache,
+ chunk_start, chunk_start + size_of_data - 1, 0);
+ return ret;
+}
+
+static int make_image(char *source_dir, struct btrfs_root *root, int out_fd)
+{
+ int ret;
+ struct btrfs_trans_handle *trans;
+
+ struct stat root_st;
+ int root_len;
+
+ struct directory_name_entry dir_head;
+
+ ret = lstat(source_dir, &root_st);
+ if (ret) {
+ fprintf(stderr, "unable to lstat the %s\n", source_dir);
+ goto fail;
+ }
+
+ root_len = strlen(source_dir);
+
+ INIT_LIST_HEAD(&dir_head.list);
+
+ trans = btrfs_start_transaction(root, 1);
+ ret = traverse_directory(trans, root, source_dir, &dir_head, out_fd);
+ if (ret) {
+ fprintf(stderr, "unable to traverse_directory\n");
+ goto fail;
+ }
+ btrfs_commit_transaction(trans, root);
+
+ printf("Making image is completed.\n");
+ return 0;
+fail:
+ fprintf(stderr, "Making image is aborted.\n");
+ return -1;
+}
+
+static u64 size_sourcedir(char *dir_name, u64 sectorsize,
+ u64 *num_of_meta_chunks_ret, u64 *size_of_data_ret)
+{
+ u64 dir_size = 0;
+ u64 total_size = 0;
+ int ret;
+ char command[1024];
+ char path[512];
+ char *file_name = "temp_file";
+ FILE *file;
+ u64 minimum_data_size = 256 * 1024 * 1024; /* 256MB */
+ u64 default_chunk_size = 8 * 1024 * 1024; /* 8MB */
+ u64 allocated_meta_size = 8 * 1024 * 1024; /* 8MB */
+ u64 allocated_total_size = 20 * 1024 * 1024; /* 20MB */
+ u64 num_of_meta_chunks = 0;
+ u64 num_of_allocated_meta_chunks =
+ allocated_meta_size / default_chunk_size;
+
+ ret = sprintf(command, "du -B 4096 -s ");
+ if (ret < 0) {
+ fprintf(stderr, "error executing sprintf for du command\n");
+ return -1;
+ }
+ strcat(command, dir_name);
+ strcat(command, " > ");
+ strcat(command, file_name);
+ ret = system(command);
+
+ file = fopen(file_name, "r");
+ ret = fscanf(file, "%lld %s\n", &dir_size, path);
+ fclose(file);
+ remove(file_name);
+
+ dir_size *= sectorsize;
+ *size_of_data_ret = dir_size;
+
+ num_of_meta_chunks = (dir_size / 2) / default_chunk_size;
+ if (((dir_size / 2) % default_chunk_size) != 0)
+ num_of_meta_chunks++;
+ if (num_of_meta_chunks <= num_of_allocated_meta_chunks)
+ num_of_meta_chunks = 0;
+ else
+ num_of_meta_chunks -= num_of_allocated_meta_chunks;
+
+ total_size = allocated_total_size + dir_size +
+ (num_of_meta_chunks * default_chunk_size);
+
+ *num_of_meta_chunks_ret = num_of_meta_chunks;
+
+ if (total_size < minimum_data_size)
+ total_size = minimum_data_size;
+
+ return total_size;
+}
+
+static int zero_output_file(int out_fd, u64 size, u32 sectorsize)
+{
+ int len = sectorsize;
+ int loop_num = size / sectorsize;
+ u64 location = 0;
+ char *buf = malloc(len);
+ int ret = 0, i;
+ ssize_t written;
+
+ if (!buf)
+ return -ENOMEM;
+ memset(buf, 0, len);
+ for (i = 0; i < loop_num; i++) {
+ written = pwrite64(out_fd, buf, len, location);
+ if (written != len)
+ ret = -EIO;
+ location += sectorsize;
+ }
+ free(buf);
+ return ret;
+}
+
int main(int ac, char **av)
{
char *file;
@@ -359,9 +1130,15 @@ int main(int ac, char **av)
int ret;
int i;
+ char *source_dir = NULL;
+ int source_dir_set = 0;
+ char *output = "output.img";
+ u64 num_of_meta_chunks = 0;
+ u64 size_of_data = 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:r:V", long_options,
&option_index);
if (c < 0)
break;
@@ -401,6 +1178,10 @@ int main(int ac, char **av)
case 'V':
print_version();
break;
+ case 'r':
+ source_dir = optarg;
+ source_dir_set = 1;
+ break;
default:
print_usage();
}
@@ -414,6 +1195,8 @@ int main(int ac, char **av)
fprintf(stderr, "Illegal nodesize %u\n", nodesize);
exit(1);
}
+ if (source_dir_set)
+ ac++;
ac = ac - optind;
if (ac == 0)
print_usage();
@@ -421,27 +1204,47 @@ int main(int ac, char **av)
printf("\nWARNING! - %s IS EXPERIMENTAL\n", BTRFS_BUILD_VERSION);
printf("WARNING! - see http://btrfs.wiki.kernel.org before using\n\n");
- file = av[optind++];
- ret = check_mounted(file);
- if (ret < 0) {
- fprintf(stderr, "error checking %s mount status\n", file);
- exit(1);
- }
- if (ret == 1) {
- fprintf(stderr, "%s is mounted\n", file);
- exit(1);
- }
- ac--;
- fd = open(file, O_RDWR);
- if (fd < 0) {
- fprintf(stderr, "unable to open %s\n", file);
- exit(1);
+ if (source_dir == 0) {
+ file = av[optind++];
+ ret = check_mounted(file);
+ if (ret < 0) {
+ fprintf(stderr, "error checking %s mount status\n", file);
+ exit(1);
+ }
+ if (ret == 1) {
+ fprintf(stderr, "%s is mounted\n", file);
+ exit(1);
+ }
+ ac--;
+ fd = open(file, O_RDWR);
+ if (fd < 0) {
+ fprintf(stderr, "unable to open %s\n", file);
+ exit(1);
+ }
+ first_fd = fd;
+ first_file = file;
+ ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
+ if (block_count == 0)
+ block_count = dev_block_count;
+ } else {
+ ac = 0;
+ fd = open_target(output);
+ if (fd < 0) {
+ fprintf(stderr, "unable to open the %s\n", file);
+ exit(1);
+ }
+
+ file = output;
+ first_fd = fd;
+ first_file = file;
+ block_count = size_sourcedir(source_dir, sectorsize,
+ &num_of_meta_chunks, &size_of_data);
+ ret = zero_output_file(fd, block_count, sectorsize);
+ if (ret) {
+ fprintf(stderr, "unable to zero the output file\n");
+ exit(1);
+ }
}
- first_fd = fd;
- first_file = file;
- ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
- if (block_count == 0)
- block_count = dev_block_count;
blocks[0] = BTRFS_SUPER_INFO_OFFSET;
for (i = 1; i < 7; i++) {
@@ -514,9 +1317,11 @@ int main(int ac, char **av)
}
raid_groups:
- ret = create_raid_groups(trans, root, data_profile,
- metadata_profile);
- BUG_ON(ret);
+ if (!source_dir_set) {
+ ret = create_raid_groups(trans, root, data_profile,
+ metadata_profile);
+ BUG_ON(ret);
+ }
ret = create_data_reloc_tree(trans, root);
BUG_ON(ret);
@@ -528,6 +1333,18 @@ raid_groups:
printf("%s\n", BTRFS_BUILD_VERSION);
btrfs_commit_transaction(trans, root);
+
+ if (source_dir_set) {
+ trans = btrfs_start_transaction(root, 1);
+ ret = create_chunks(trans, root,
+ num_of_meta_chunks, size_of_data);
+ BUG_ON(ret);
+ btrfs_commit_transaction(trans, root);
+
+ ret = make_image(source_dir, root, fd);
+ BUG_ON(ret);
+ }
+
ret = close_ctree(root);
BUG_ON(ret);
diff --git a/volumes.c b/volumes.c
index 7671855..4bb77e2 100644
--- a/volumes.c
+++ b/volumes.c
@@ -857,6 +857,110 @@ again:
return ret;
}
+int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root, u64 *start,
+ u64 num_bytes, u64 type)
+{
+ u64 dev_offset;
+ struct btrfs_fs_info *info = extent_root->fs_info;
+ struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
+ struct btrfs_stripe *stripes;
+ struct btrfs_device *device = NULL;
+ struct btrfs_chunk *chunk;
+ struct list_head *dev_list = &extent_root->fs_info->fs_devices->devices;
+ struct list_head *cur;
+ struct map_lookup *map;
+ u64 physical;
+ u64 calc_size = 8 * 1024 * 1024;
+ int num_stripes = 1;
+ int sub_stripes = 0;
+ int ret;
+ int index;
+ int stripe_len = 64 * 1024;
+ struct btrfs_key key;
+
+ key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
+ key.type = BTRFS_CHUNK_ITEM_KEY;
+ ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ &key.offset);
+ if (ret)
+ return ret;
+
+ chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS);
+ if (!chunk)
+ return -ENOMEM;
+
+ map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
+ if (!map) {
+ kfree(chunk);
+ return -ENOMEM;
+ }
+
+ stripes = &chunk->stripe;
+ calc_size = num_bytes;
+
+ index = 0;
+ cur = dev_list->next;
+ device = list_entry(cur, struct btrfs_device, dev_list);
+
+ while (index < num_stripes) {
+ struct btrfs_stripe *stripe;
+
+ ret = btrfs_alloc_dev_extent(trans, device,
+ info->chunk_root->root_key.objectid,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset,
+ calc_size, &dev_offset);
+ BUG_ON(ret);
+
+ device->bytes_used += calc_size;
+ ret = btrfs_update_device(trans, device);
+ BUG_ON(ret);
+
+ map->stripes[index].dev = device;
+ map->stripes[index].physical = dev_offset;
+ stripe = stripes + index;
+ btrfs_set_stack_stripe_devid(stripe, device->devid);
+ btrfs_set_stack_stripe_offset(stripe, dev_offset);
+ memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE);
+ physical = dev_offset;
+ index++;
+ }
+
+ /* key was set above */
+ btrfs_set_stack_chunk_length(chunk, num_bytes);
+ btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
+ btrfs_set_stack_chunk_stripe_len(chunk, stripe_len);
+ btrfs_set_stack_chunk_type(chunk, type);
+ btrfs_set_stack_chunk_num_stripes(chunk, num_stripes);
+ btrfs_set_stack_chunk_io_align(chunk, stripe_len);
+ btrfs_set_stack_chunk_io_width(chunk, stripe_len);
+ btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
+ btrfs_set_stack_chunk_sub_stripes(chunk, sub_stripes);
+ map->sector_size = extent_root->sectorsize;
+ map->stripe_len = stripe_len;
+ map->io_align = stripe_len;
+ map->io_width = stripe_len;
+ map->type = type;
+ map->num_stripes = num_stripes;
+ map->sub_stripes = sub_stripes;
+
+ ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
+ btrfs_chunk_item_size(num_stripes));
+ BUG_ON(ret);
+ *start = key.offset;
+
+ map->ce.start = key.offset;
+ map->ce.size = num_bytes;
+
+ ret = insert_existing_cache_extent(
+ &extent_root->fs_info->mapping_tree.cache_tree,
+ &map->ce);
+ BUG_ON(ret);
+
+ kfree(chunk);
+ return ret;
+}
+
void btrfs_mapping_init(struct btrfs_mapping_tree *tree)
{
cache_tree_init(&tree->cache_tree);
diff --git a/volumes.h b/volumes.h
index bb78751..93b0e48 100644
--- a/volumes.h
+++ b/volumes.h
@@ -107,6 +107,9 @@ int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 *start,
u64 *num_bytes, u64 type);
+int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root, u64 *start,
+ u64 num_bytes, u64 type);
int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
int btrfs_add_device(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
--
1.6.3.3
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2010-07-08 9:17 [PATCH V2] btrfs-progs: Add new feature to mkfs.btrfs to make file system image file from source directory Donggeun Kim
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