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btrfs-progs: mkfs: move image creation of rootdir to its own files

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In fact, --rootdir option is getting more and more independent from
normal mkfs code.

So move image creation function, make_image() and its related code to
mkfs/rootdir.[ch], and rename the function to btrfs_mkfs_fill_dir().

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2017-10-19 13:41:37 +08:00 committed by David Sterba
parent 41617f1582
commit d6fc0dfa7e
4 changed files with 710 additions and 652 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Makefile
View File

@ -123,7 +123,7 @@ libbtrfs_headers = send-stream.h send-utils.h send.h kernel-lib/rbtree.h btrfs-l
extent-cache.h extent_io.h ioctl.h ctree.h btrfsck.h version.h
convert_objects = convert/main.o convert/common.o convert/source-fs.o \
convert/source-ext2.o convert/source-reiserfs.o
mkfs_objects = mkfs/main.o mkfs/common.o
mkfs_objects = mkfs/main.o mkfs/common.o mkfs/rootdir.o
image_objects = image/main.o image/sanitize.o
all_objects = $(objects) $(cmds_objects) $(libbtrfs_objects) $(convert_objects) \
$(mkfs_objects) $(image_objects)

654
mkfs/main.c
View File

@ -24,17 +24,12 @@
#include "ioctl.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
/* #include <sys/dir.h> included via androidcompat.h */
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <uuid/uuid.h>
#include <ctype.h>
#include <sys/xattr.h>
#include <limits.h>
#include <linux/limits.h>
#include <blkid/blkid.h>
#include <ftw.h>
#include "ctree.h"
@ -45,20 +40,11 @@
#include "list_sort.h"
#include "help.h"
#include "mkfs/common.h"
#include "mkfs/rootdir.h"
#include "fsfeatures.h"
int path_cat_out(char *out, const char *p1, const char *p2);
static u64 index_cnt = 2;
static int verbose = 1;
struct directory_name_entry {
const char *dir_name;
const char *path;
ino_t inum;
struct list_head list;
};
struct mkfs_allocation {
u64 data;
u64 metadata;
@ -428,583 +414,6 @@ static char *parse_subvol_name(const char *input)
return strdup(input);
}
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;
location.type = 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;
if (S_ISSOCK(st->st_mode))
filetype = BTRFS_FT_SOCK;
if (S_ISCHR(st->st_mode))
filetype = BTRFS_FT_CHRDEV;
if (S_ISBLK(st->st_mode))
filetype = BTRFS_FT_BLKDEV;
if (S_ISFIFO(st->st_mode))
filetype = BTRFS_FT_FIFO;
ret = btrfs_insert_dir_item(trans, root, name, name_len,
parent_inum, &location,
filetype, index_cnt);
if (ret)
return ret;
ret = btrfs_insert_inode_ref(trans, root, name, name_len,
objectid, parent_inum, 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->fs_info->sectorsize;
/*
* btrfs_inode_item has some reserved fields
* and represents on-disk inode entry, so
* zero everything to prevent information leak
*/
memset(dst, 0, sizeof (*dst));
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 (entry->d_name[0] == '.' &&
(entry->d_name[1] == 0 ||
(entry->d_name[1] == '.' && entry->d_name[2] == 0)))
return 0;
return 1;
}
static void free_namelist(struct direct **files, int count)
{
int i;
if (count < 0)
return;
for (i = 0; i < count; ++i)
free(files[i]);
free(files);
}
static u64 calculate_dir_inode_size(const 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);
}
free_namelist(files, count);
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, const char *name,
u64 self_objectid,
struct btrfs_inode_item *inode_ret)
{
int ret;
struct btrfs_inode_item btrfs_inode;
u64 objectid;
u64 inode_size = 0;
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);
}
ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
*inode_ret = btrfs_inode;
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) {
if(errno == ENOTSUP)
return 0;
error("getting a list of xattr failed for %s: %s", file_name,
strerror(errno));
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) {
if(errno == ENOTSUP)
return 0;
error("gettig a xattr value failed for %s attr %s: %s",
file_name, cur_name, strerror(errno));
return ret;
}
ret = btrfs_insert_xattr_item(trans, root, cur_name,
cur_name_len, cur_value,
ret, objectid);
if (ret) {
error("inserting a xattr item failed for %s: %s",
file_name, strerror(-ret));
}
cur_name = strtok(next_location, &delimiter);
}
return ret;
}
static int add_symbolic_link(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, const char *path_name)
{
int ret;
char buf[PATH_MAX];
ret = readlink(path_name, buf, sizeof(buf));
if (ret <= 0) {
error("readlink failed for %s: %s", path_name, strerror(errno));
goto fail;
}
if (ret >= sizeof(buf)) {
error("symlink too long for %s", path_name);
ret = -1;
goto fail;
}
buf[ret] = '\0'; /* readlink does not do it for us */
ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
buf, ret + 1);
fail:
return ret;
}
static int add_file_items(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_inode_item *btrfs_inode, u64 objectid,
struct stat *st, const char *path_name)
{
int ret = -1;
ssize_t ret_read;
u64 bytes_read = 0;
struct btrfs_key key;
int blocks;
u32 sectorsize = root->fs_info->sectorsize;
u64 first_block = 0;
u64 file_pos = 0;
u64 cur_bytes;
u64 total_bytes;
struct extent_buffer *eb = NULL;
int fd;
if (st->st_size == 0)
return 0;
fd = open(path_name, O_RDONLY);
if (fd == -1) {
error("cannot open %s: %s", path_name, strerror(errno));
return ret;
}
blocks = st->st_size / sectorsize;
if (st->st_size % sectorsize)
blocks += 1;
if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
char *buffer = malloc(st->st_size);
if (!buffer) {
ret = -ENOMEM;
goto end;
}
ret_read = pread64(fd, buffer, st->st_size, bytes_read);
if (ret_read == -1) {
error("cannot read %s at offset %llu length %llu: %s",
path_name, (unsigned long long)bytes_read,
(unsigned long long)st->st_size,
strerror(errno));
free(buffer);
goto end;
}
ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
buffer, st->st_size);
free(buffer);
goto end;
}
/* round up our st_size to the FS blocksize */
total_bytes = (u64)blocks * sectorsize;
/*
* do our IO in extent buffers so it can work
* against any raid type
*/
eb = calloc(1, sizeof(*eb) + sectorsize);
if (!eb) {
ret = -ENOMEM;
goto end;
}
again:
/*
* keep our extent size at 1MB max, this makes it easier to work inside
* the tiny block groups created during mkfs
*/
cur_bytes = min(total_bytes, (u64)SZ_1M);
ret = btrfs_reserve_extent(trans, root, cur_bytes, 0, 0, (u64)-1,
&key, 1);
if (ret)
goto end;
first_block = key.objectid;
bytes_read = 0;
while (bytes_read < cur_bytes) {
memset(eb->data, 0, sectorsize);
ret_read = pread64(fd, eb->data, sectorsize, file_pos + bytes_read);
if (ret_read == -1) {
error("cannot read %s at offset %llu length %llu: %s",
path_name,
(unsigned long long)file_pos + bytes_read,
(unsigned long long)sectorsize,
strerror(errno));
goto end;
}
eb->start = first_block + bytes_read;
eb->len = sectorsize;
/*
* we're doing the csum before we record the extent, but
* that's ok
*/
ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
first_block + bytes_read + sectorsize,
first_block + bytes_read,
eb->data, sectorsize);
if (ret)
goto end;
ret = write_and_map_eb(root->fs_info, eb);
if (ret) {
error("failed to write %s", path_name);
goto end;
}
bytes_read += sectorsize;
}
if (bytes_read) {
ret = btrfs_record_file_extent(trans, root, objectid, btrfs_inode,
file_pos, first_block, cur_bytes);
if (ret)
goto end;
}
file_pos += cur_bytes;
total_bytes -= cur_bytes;
if (total_bytes)
goto again;
end:
free(eb);
close(fd);
return ret;
}
static int traverse_directory(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *dir_name,
struct directory_name_entry *dir_head)
{
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;
const char *parent_dir_name;
char real_path[PATH_MAX];
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));
if (!dir_entry)
return -ENOMEM;
dir_entry->dir_name = dir_name;
dir_entry->path = realpath(dir_name, real_path);
if (!dir_entry->path) {
error("realpath failed for %s: %s", dir_name, strerror(errno));
ret = -1;
goto fail_no_dir;
}
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;
root_dir_key.type = BTRFS_INODE_ITEM_KEY;
ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
if (ret) {
error("failed to lookup root dir: %d", ret);
goto fail_no_dir;
}
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(&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)) {
error("chdir failed for %s: %s",
parent_dir_name, strerror(errno));
ret = -1;
goto fail_no_files;
}
count = scandir(parent_dir_entry->path, &files,
directory_select, NULL);
if (count == -1)
{
error("scandir failed for %s: %s",
parent_dir_name, strerror (errno));
ret = -1;
goto fail;
}
for (i = 0; i < count; i++) {
cur_file = files[i];
if (lstat(cur_file->d_name, &st) == -1) {
error("lstat failed for %s: %s",
cur_file->d_name, strerror(errno));
ret = -1;
goto fail;
}
cur_inum = st.st_ino;
ret = add_directory_items(trans, root,
cur_inum, parent_inum,
cur_file->d_name,
&st, &dir_index_cnt);
if (ret) {
error("unable to add directory items for %s: %d",
cur_file->d_name, ret);
goto fail;
}
ret = add_inode_items(trans, root, &st,
cur_file->d_name, cur_inum,
&cur_inode);
if (ret == -EEXIST) {
if (st.st_nlink <= 1) {
error(
"item %s already exists but has wrong st_nlink %lu <= 1",
cur_file->d_name,
(unsigned long)st.st_nlink);
goto fail;
}
continue;
}
if (ret) {
error("unable to add inode items for %s: %d",
cur_file->d_name, ret);
goto fail;
}
ret = add_xattr_item(trans, root,
cur_inum, cur_file->d_name);
if (ret) {
error("unable to add xattr items for %s: %d",
cur_file->d_name, ret);
if(ret != -ENOTSUP)
goto fail;
}
if (S_ISDIR(st.st_mode)) {
char tmp[PATH_MAX];
dir_entry = malloc(sizeof(struct directory_name_entry));
if (!dir_entry) {
ret = -ENOMEM;
goto fail;
}
dir_entry->dir_name = cur_file->d_name;
if (path_cat_out(tmp, parent_dir_entry->path,
cur_file->d_name)) {
error("invalid path: %s/%s",
parent_dir_entry->path,
cur_file->d_name);
ret = -EINVAL;
goto fail;
}
dir_entry->path = strdup(tmp);
if (!dir_entry->path) {
error("not enough memory to store path");
ret = -ENOMEM;
goto fail;
}
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, &st,
cur_file->d_name);
if (ret) {
error("unable to add file items for %s: %d",
cur_file->d_name, ret);
goto fail;
}
} else if (S_ISLNK(st.st_mode)) {
ret = add_symbolic_link(trans, root,
cur_inum, cur_file->d_name);
if (ret) {
error("unable to add symlink for %s: %d",
cur_file->d_name, ret);
goto fail;
}
}
}
free_namelist(files, count);
free(parent_dir_entry);
index_cnt = 2;
} while (!list_empty(&dir_head->list));
out:
return !!ret;
fail:
free_namelist(files, count);
fail_no_files:
free(parent_dir_entry);
goto out;
fail_no_dir:
free(dir_entry);
goto out;
}
static int create_chunks(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 num_of_meta_chunks,
u64 size_of_data,
@ -1052,63 +461,6 @@ static int create_chunks(struct btrfs_trans_handle *trans,
return ret;
}
static int make_image(const char *source_dir, struct btrfs_root *root)
{
int ret;
struct btrfs_trans_handle *trans;
struct stat root_st;
struct directory_name_entry dir_head;
struct directory_name_entry *dir_entry = NULL;
ret = lstat(source_dir, &root_st);
if (ret) {
error("unable to lstat %s: %s", source_dir, strerror(errno));
ret = -errno;
goto out;
}
INIT_LIST_HEAD(&dir_head.list);
trans = btrfs_start_transaction(root, 1);
BUG_ON(IS_ERR(trans));
ret = traverse_directory(trans, root, source_dir, &dir_head);
if (ret) {
error("unable to traverse directory %s: %d", source_dir, ret);
goto fail;
}
ret = btrfs_commit_transaction(trans, root);
if (ret) {
error("transaction commit failed: %d", ret);
goto out;
}
if (verbose)
printf("Making image is completed.\n");
return 0;
fail:
/*
* Since we don't have btrfs_abort_transaction() yet, uncommitted trans
* will trigger a BUG_ON().
*
* However before mkfs is fully finished, the magic number is invalid,
* so even we commit transaction here, the fs still can't be mounted.
*
* To do a graceful error out, here we commit transaction as a
* workaround.
* Since we have already hit some problem, the return value doesn't
* matter now.
*/
btrfs_commit_transaction(trans, root);
while (!list_empty(&dir_head.list)) {
dir_entry = list_entry(dir_head.list.next,
struct directory_name_entry, list);
list_del(&dir_entry->list);
free(dir_entry);
}
out:
return ret;
}
/*
* This ignores symlinks with unreadable targets and subdirs that can't
* be read. It's a best-effort to give a rough estimate of the size of
@ -1964,13 +1316,13 @@ raid_groups:
subvol_name);
goto out;
}
ret = make_image(source_dir, file_root);
ret = btrfs_mkfs_fill_dir(source_dir, file_root, verbose);
if (ret) {
error("error while filling filesystem: %d", ret);
goto out;
}
} else {
ret = make_image(source_dir, root);
ret = btrfs_mkfs_fill_dir(source_dir, root, verbose);
if (ret) {
error("error while filling filesystem: %d", ret);
goto out;

672
mkfs/rootdir.c Normal file
View File

@ -0,0 +1,672 @@
/*
* Copyright (C) 2017 SUSE. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program.
*/
#include "kerncompat.h"
#include "androidcompat.h"
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/xattr.h>
#include <linux/limits.h>
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
#include "ctree.h"
#include "internal.h"
#include "disk-io.h"
#include "messages.h"
#include "transaction.h"
#include "utils.h"
#include "mkfs/rootdir.h"
#include "send-utils.h"
static u64 index_cnt = 2;
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;
location.type = 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;
if (S_ISSOCK(st->st_mode))
filetype = BTRFS_FT_SOCK;
if (S_ISCHR(st->st_mode))
filetype = BTRFS_FT_CHRDEV;
if (S_ISBLK(st->st_mode))
filetype = BTRFS_FT_BLKDEV;
if (S_ISFIFO(st->st_mode))
filetype = BTRFS_FT_FIFO;
ret = btrfs_insert_dir_item(trans, root, name, name_len,
parent_inum, &location,
filetype, index_cnt);
if (ret)
return ret;
ret = btrfs_insert_inode_ref(trans, root, name, name_len,
objectid, parent_inum, 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->fs_info->sectorsize;
/*
* btrfs_inode_item has some reserved fields
* and represents on-disk inode entry, so
* zero everything to prevent information leak
*/
memset(dst, 0, sizeof(*dst));
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 (entry->d_name[0] == '.' &&
(entry->d_name[1] == 0 ||
(entry->d_name[1] == '.' && entry->d_name[2] == 0)))
return 0;
return 1;
}
static void free_namelist(struct direct **files, int count)
{
int i;
if (count < 0)
return;
for (i = 0; i < count; ++i)
free(files[i]);
free(files);
}
static u64 calculate_dir_inode_size(const 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);
}
free_namelist(files, count);
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, const char *name,
u64 self_objectid,
struct btrfs_inode_item *inode_ret)
{
int ret;
struct btrfs_inode_item btrfs_inode;
u64 objectid;
u64 inode_size = 0;
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);
}
ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
*inode_ret = btrfs_inode;
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) {
if (errno == ENOTSUP)
return 0;
error("getting a list of xattr failed for %s: %s", file_name,
strerror(errno));
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) {
if (errno == ENOTSUP)
return 0;
error("gettig a xattr value failed for %s attr %s: %s",
file_name, cur_name, strerror(errno));
return ret;
}
ret = btrfs_insert_xattr_item(trans, root, cur_name,
cur_name_len, cur_value,
ret, objectid);
if (ret) {
error("inserting a xattr item failed for %s: %s",
file_name, strerror(-ret));
}
cur_name = strtok(next_location, &delimiter);
}
return ret;
}
static int add_symbolic_link(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, const char *path_name)
{
int ret;
char buf[PATH_MAX];
ret = readlink(path_name, buf, sizeof(buf));
if (ret <= 0) {
error("readlink failed for %s: %s", path_name, strerror(errno));
goto fail;
}
if (ret >= sizeof(buf)) {
error("symlink too long for %s", path_name);
ret = -1;
goto fail;
}
buf[ret] = '\0'; /* readlink does not do it for us */
ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
buf, ret + 1);
fail:
return ret;
}
static int add_file_items(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_inode_item *btrfs_inode, u64 objectid,
struct stat *st, const char *path_name)
{
int ret = -1;
ssize_t ret_read;
u64 bytes_read = 0;
struct btrfs_key key;
int blocks;
u32 sectorsize = root->fs_info->sectorsize;
u64 first_block = 0;
u64 file_pos = 0;
u64 cur_bytes;
u64 total_bytes;
struct extent_buffer *eb = NULL;
int fd;
if (st->st_size == 0)
return 0;
fd = open(path_name, O_RDONLY);
if (fd == -1) {
error("cannot open %s: %s", path_name, strerror(errno));
return ret;
}
blocks = st->st_size / sectorsize;
if (st->st_size % sectorsize)
blocks += 1;
if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
char *buffer = malloc(st->st_size);
if (!buffer) {
ret = -ENOMEM;
goto end;
}
ret_read = pread64(fd, buffer, st->st_size, bytes_read);
if (ret_read == -1) {
error("cannot read %s at offset %llu length %llu: %s",
path_name, (unsigned long long)bytes_read,
(unsigned long long)st->st_size,
strerror(errno));
free(buffer);
goto end;
}
ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
buffer, st->st_size);
free(buffer);
goto end;
}
/* round up our st_size to the FS blocksize */
total_bytes = (u64)blocks * sectorsize;
/*
* do our IO in extent buffers so it can work
* against any raid type
*/
eb = calloc(1, sizeof(*eb) + sectorsize);
if (!eb) {
ret = -ENOMEM;
goto end;
}
again:
/*
* keep our extent size at 1MB max, this makes it easier to work inside
* the tiny block groups created during mkfs
*/
cur_bytes = min(total_bytes, (u64)SZ_1M);
ret = btrfs_reserve_extent(trans, root, cur_bytes, 0, 0, (u64)-1,
&key, 1);
if (ret)
goto end;
first_block = key.objectid;
bytes_read = 0;
while (bytes_read < cur_bytes) {
memset(eb->data, 0, sectorsize);
ret_read = pread64(fd, eb->data, sectorsize, file_pos +
bytes_read);
if (ret_read == -1) {
error("cannot read %s at offset %llu length %llu: %s",
path_name,
(unsigned long long)file_pos + bytes_read,
(unsigned long long)sectorsize,
strerror(errno));
goto end;
}
eb->start = first_block + bytes_read;
eb->len = sectorsize;
/*
* we're doing the csum before we record the extent, but
* that's ok
*/
ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
first_block + bytes_read + sectorsize,
first_block + bytes_read,
eb->data, sectorsize);
if (ret)
goto end;
ret = write_and_map_eb(root->fs_info, eb);
if (ret) {
error("failed to write %s", path_name);
goto end;
}
bytes_read += sectorsize;
}
if (bytes_read) {
ret = btrfs_record_file_extent(trans, root, objectid,
btrfs_inode, file_pos, first_block, cur_bytes);
if (ret)
goto end;
}
file_pos += cur_bytes;
total_bytes -= cur_bytes;
if (total_bytes)
goto again;
end:
free(eb);
close(fd);
return ret;
}
static int traverse_directory(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *dir_name,
struct directory_name_entry *dir_head)
{
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;
const char *parent_dir_name;
char real_path[PATH_MAX];
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));
if (!dir_entry)
return -ENOMEM;
dir_entry->dir_name = dir_name;
dir_entry->path = realpath(dir_name, real_path);
if (!dir_entry->path) {
error("realpath failed for %s: %s", dir_name, strerror(errno));
ret = -1;
goto fail_no_dir;
}
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;
root_dir_key.type = BTRFS_INODE_ITEM_KEY;
ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
if (ret) {
error("failed to lookup root dir: %d", ret);
goto fail_no_dir;
}
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(&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)) {
error("chdir failed for %s: %s",
parent_dir_name, strerror(errno));
ret = -1;
goto fail_no_files;
}
count = scandir(parent_dir_entry->path, &files,
directory_select, NULL);
if (count == -1) {
error("scandir failed for %s: %s",
parent_dir_name, strerror(errno));
ret = -1;
goto fail;
}
for (i = 0; i < count; i++) {
cur_file = files[i];
if (lstat(cur_file->d_name, &st) == -1) {
error("lstat failed for %s: %s",
cur_file->d_name, strerror(errno));
ret = -1;
goto fail;
}
cur_inum = st.st_ino;
ret = add_directory_items(trans, root,
cur_inum, parent_inum,
cur_file->d_name,
&st, &dir_index_cnt);
if (ret) {
error("unable to add directory items for %s: %d",
cur_file->d_name, ret);
goto fail;
}
ret = add_inode_items(trans, root, &st,
cur_file->d_name, cur_inum,
&cur_inode);
if (ret == -EEXIST) {
if (st.st_nlink <= 1) {
error(
"item %s already exists but has wrong st_nlink %lu <= 1",
cur_file->d_name,
(unsigned long)st.st_nlink);
goto fail;
}
continue;
}
if (ret) {
error("unable to add inode items for %s: %d",
cur_file->d_name, ret);
goto fail;
}
ret = add_xattr_item(trans, root,
cur_inum, cur_file->d_name);
if (ret) {
error("unable to add xattr items for %s: %d",
cur_file->d_name, ret);
if (ret != -ENOTSUP)
goto fail;
}
if (S_ISDIR(st.st_mode)) {
char tmp[PATH_MAX];
dir_entry = malloc(sizeof(*dir_entry));
if (!dir_entry) {
ret = -ENOMEM;
goto fail;
}
dir_entry->dir_name = cur_file->d_name;
if (path_cat_out(tmp, parent_dir_entry->path,
cur_file->d_name)) {
error("invalid path: %s/%s",
parent_dir_entry->path,
cur_file->d_name);
ret = -EINVAL;
goto fail;
}
dir_entry->path = strdup(tmp);
if (!dir_entry->path) {
error("not enough memory to store path");
ret = -ENOMEM;
goto fail;
}
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, &st,
cur_file->d_name);
if (ret) {
error("unable to add file items for %s: %d",
cur_file->d_name, ret);
goto fail;
}
} else if (S_ISLNK(st.st_mode)) {
ret = add_symbolic_link(trans, root,
cur_inum, cur_file->d_name);
if (ret) {
error("unable to add symlink for %s: %d",
cur_file->d_name, ret);
goto fail;
}
}
}
free_namelist(files, count);
free(parent_dir_entry);
index_cnt = 2;
} while (!list_empty(&dir_head->list));
out:
return !!ret;
fail:
free_namelist(files, count);
fail_no_files:
free(parent_dir_entry);
goto out;
fail_no_dir:
free(dir_entry);
goto out;
}
int btrfs_mkfs_fill_dir(const char *source_dir, struct btrfs_root *root,
bool verbose)
{
int ret;
struct btrfs_trans_handle *trans;
struct stat root_st;
struct directory_name_entry dir_head;
struct directory_name_entry *dir_entry = NULL;
ret = lstat(source_dir, &root_st);
if (ret) {
error("unable to lstat %s: %s", source_dir, strerror(errno));
ret = -errno;
goto out;
}
INIT_LIST_HEAD(&dir_head.list);
trans = btrfs_start_transaction(root, 1);
BUG_ON(IS_ERR(trans));
ret = traverse_directory(trans, root, source_dir, &dir_head);
if (ret) {
error("unable to traverse directory %s: %d", source_dir, ret);
goto fail;
}
ret = btrfs_commit_transaction(trans, root);
if (ret) {
error("transaction commit failed: %d", ret);
goto out;
}
if (verbose)
printf("Making image is completed.\n");
return 0;
fail:
/*
* Since we don't have btrfs_abort_transaction() yet, uncommitted trans
* will trigger a BUG_ON().
*
* However before mkfs is fully finished, the magic number is invalid,
* so even we commit transaction here, the fs still can't be mounted.
*
* To do a graceful error out, here we commit transaction as a
* workaround.
* Since we have already hit some problem, the return value doesn't
* matter now.
*/
btrfs_commit_transaction(trans, root);
while (!list_empty(&dir_head.list)) {
dir_entry = list_entry(dir_head.list.next,
struct directory_name_entry, list);
list_del(&dir_entry->list);
free(dir_entry);
}
out:
return ret;
}

34
mkfs/rootdir.h Normal file
View File

@ -0,0 +1,34 @@
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program.
*/
/*
* Defines and functions declarations for mkfs --rootdir
*/
#ifndef __BTRFS_MKFS_ROOTDIR_H__
#define __BTRFS_MKFS_ROOTDIR_H__
#include "kernel-lib/list.h"
struct directory_name_entry {
const char *dir_name;
const char *path;
ino_t inum;
struct list_head list;
};
int btrfs_mkfs_fill_dir(const char *source_dir, struct btrfs_root *root,
bool verbose);
#endif