* Boston, MA 021110-1307, USA.
*/
+/*
+ * Btrfs convert design:
+ *
+ * The overall design of btrfs convert is like the following:
+ *
+ * |<------------------Old fs----------------------------->|
+ * |<- used ->| |<- used ->| |<- used ->|
+ * ||
+ * \/
+ * |<---------------Btrfs fs------------------------------>|
+ * |<- Old data chunk ->|< new chunk (D/M/S)>|<- ODC ->|
+ * |<-Old-FE->| |<-Old-FE->|<- Btrfs extents ->|<-Old-FE->|
+ *
+ * ODC = Old data chunk, btrfs chunks containing old fs data
+ * Mapped 1:1 (logical address == device offset)
+ * Old-FE = file extents pointing to old fs.
+ *
+ * So old fs used space is (mostly) kept as is, while btrfs will insert
+ * its chunk (Data/Meta/Sys) into large enough free space.
+ * In this way, we can create different profiles for metadata/data for
+ * converted fs.
+ *
+ * We must reserve and relocate 3 ranges for btrfs:
+ * * [0, 1M) - area never used for any data except the first
+ * superblock
+ * * [btrfs_sb_offset(1), +64K) - 1st superblock backup copy
+ * * [btrfs_sb_offset(2), +64K) - 2nd, dtto
+ *
+ * Most work is spent handling corner cases around these reserved ranges.
+ *
+ * Detailed workflow is:
+ * 1) Scan old fs used space and calculate data chunk layout
+ * 1.1) Scan old fs
+ * We can a map used space of old fs
+ *
+ * 1.2) Calculate data chunk layout - this is the hard part
+ * New data chunks must meet 3 conditions using result fomr 1.1
+ * a. Large enough to be a chunk
+ * b. Doesn't intersect reserved ranges
+ * c. Covers all the remaining old fs used space
+ *
+ * NOTE: This can be simplified if we don't need to handle backup supers
+ *
+ * 1.3) Calculate usable space for new btrfs chunks
+ * Btrfs chunk usable space must meet 3 conditions using result from 1.2
+ * a. Large enough to be a chunk
+ * b. Doesn't intersect reserved ranges
+ * c. Doesn't cover any data chunks in 1.1
+ *
+ * 2) Create basic btrfs filesystem structure
+ * Initial metadata and sys chunks are inserted in the first availabe
+ * space found in step 1.3
+ * Then insert all data chunks into the basic btrfs
+ *
+ * 3) Create convert image
+ * We need to relocate reserved ranges here.
+ * After this step, the convert image is done, and we can use the image
+ * as reflink source to create old files
+ *
+ * 4) Iterate old fs to create files
+ * We just reflink file extents from old fs to newly created files on
+ * btrfs.
+ */
+
#include "kerncompat.h"
-#include <sys/ioctl.h>
-#include <sys/mount.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
-#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
-#include <uuid/uuid.h>
-#include <linux/limits.h>
#include <getopt.h>
+#include <pthread.h>
+#include <stdbool.h>
#include "ctree.h"
#include "disk-io.h"
#include "volumes.h"
#include "transaction.h"
-#include "crc32c.h"
#include "utils.h"
#include "task-utils.h"
#include "help.h"
#include "mkfs/common.h"
#include "convert/common.h"
+#include "convert/source-fs.h"
+#include "fsfeatures.h"
-#if BTRFSCONVERT_EXT2
-#include <ext2fs/ext2_fs.h>
-#include <ext2fs/ext2fs.h>
-#include <ext2fs/ext2_ext_attr.h>
-
-#define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
+extern const struct btrfs_convert_operations ext2_convert_ops;
+extern const struct btrfs_convert_operations reiserfs_convert_ops;
-/*
- * Compatibility code for e2fsprogs 1.41 which doesn't support RO compat flag
- * BIGALLOC.
- * Unlike normal RO compat flag, BIGALLOC affects how e2fsprogs check used
- * space, and btrfs-convert heavily relies on it.
- */
-#ifdef HAVE_OLD_E2FSPROGS
-#define EXT2FS_CLUSTER_RATIO(fs) (1)
-#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_BLOCKS_PER_GROUP(s))
-#define EXT2FS_B2C(fs, blk) (blk)
+static const struct btrfs_convert_operations *convert_operations[] = {
+#if BTRFSCONVERT_EXT2
+ &ext2_convert_ops,
#endif
-
+#if BTRFSCONVERT_REISERFS
+ &reiserfs_convert_ops,
#endif
-
-#define CONV_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
-
-struct task_ctx {
- uint32_t max_copy_inodes;
- uint32_t cur_copy_inodes;
- struct task_info *info;
};
static void *print_copied_inodes(void *p)
{
struct task_ctx *priv = p;
const char work_indicator[] = { '.', 'o', 'O', 'o' };
- uint32_t count = 0;
+ u64 count = 0;
task_period_start(priv->info, 1000 /* 1s */);
while (1) {
count++;
- printf("copy inodes [%c] [%10d/%10d]\r",
- work_indicator[count % 4], priv->cur_copy_inodes,
- priv->max_copy_inodes);
+ pthread_mutex_lock(&priv->mutex);
+ printf("copy inodes [%c] [%10llu/%10llu]\r",
+ work_indicator[count % 4],
+ (unsigned long long)priv->cur_copy_inodes,
+ (unsigned long long)priv->max_copy_inodes);
+ pthread_mutex_unlock(&priv->mutex);
fflush(stdout);
task_period_wait(priv->info);
}
return 0;
}
-struct btrfs_convert_context;
-struct btrfs_convert_operations {
- const char *name;
- int (*open_fs)(struct btrfs_convert_context *cctx, const char *devname);
- int (*read_used_space)(struct btrfs_convert_context *cctx);
- int (*copy_inodes)(struct btrfs_convert_context *cctx,
- struct btrfs_root *root, int datacsum,
- int packing, int noxattr, struct task_ctx *p);
- void (*close_fs)(struct btrfs_convert_context *cctx);
- int (*check_state)(struct btrfs_convert_context *cctx);
-};
-
-static void init_convert_context(struct btrfs_convert_context *cctx)
-{
- cache_tree_init(&cctx->used);
- cache_tree_init(&cctx->data_chunks);
- cache_tree_init(&cctx->free);
-}
-
-static void clean_convert_context(struct btrfs_convert_context *cctx)
-{
- free_extent_cache_tree(&cctx->used);
- free_extent_cache_tree(&cctx->data_chunks);
- free_extent_cache_tree(&cctx->free);
-}
-
static inline int copy_inodes(struct btrfs_convert_context *cctx,
- struct btrfs_root *root, int datacsum,
- int packing, int noxattr, struct task_ctx *p)
+ struct btrfs_root *root, u32 convert_flags,
+ struct task_ctx *p)
{
- return cctx->convert_ops->copy_inodes(cctx, root, datacsum, packing,
- noxattr, p);
+ return cctx->convert_ops->copy_inodes(cctx, root, convert_flags, p);
}
static inline void convert_close_fs(struct btrfs_convert_context *cctx)
return cctx->convert_ops->check_state(cctx);
}
-static int intersect_with_sb(u64 bytenr, u64 num_bytes)
-{
- int i;
- u64 offset;
-
- for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- offset = btrfs_sb_offset(i);
- offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
-
- if (bytenr < offset + BTRFS_STRIPE_LEN &&
- bytenr + num_bytes > offset)
- return 1;
- }
- return 0;
-}
-
-static int convert_insert_dirent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- const char *name, size_t name_len,
- u64 dir, u64 objectid,
- u8 file_type, u64 index_cnt,
- struct btrfs_inode_item *inode)
-{
- int ret;
- u64 inode_size;
- struct btrfs_key location = {
- .objectid = objectid,
- .offset = 0,
- .type = BTRFS_INODE_ITEM_KEY,
- };
-
- ret = btrfs_insert_dir_item(trans, root, name, name_len,
- dir, &location, file_type, index_cnt);
- if (ret)
- return ret;
- ret = btrfs_insert_inode_ref(trans, root, name, name_len,
- objectid, dir, index_cnt);
- if (ret)
- return ret;
- inode_size = btrfs_stack_inode_size(inode) + name_len * 2;
- btrfs_set_stack_inode_size(inode, inode_size);
-
- return 0;
-}
-
-static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
- u32 num_bytes, char *buffer)
-{
- int ret;
- struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
-
- ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
- if (ret != num_bytes)
- goto fail;
- ret = 0;
-fail:
- if (ret > 0)
- ret = -1;
- return ret;
-}
-
static int csum_disk_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 disk_bytenr, u64 num_bytes)
{
- u32 blocksize = root->sectorsize;
+ u32 blocksize = root->fs_info->sectorsize;
u64 offset;
char *buffer;
int ret = 0;
return ret;
}
-struct blk_iterate_data {
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root;
- struct btrfs_root *convert_root;
- struct btrfs_inode_item *inode;
- u64 convert_ino;
- u64 objectid;
- u64 first_block;
- u64 disk_block;
- u64 num_blocks;
- u64 boundary;
- int checksum;
- int errcode;
-};
-
-static void init_blk_iterate_data(struct blk_iterate_data *data,
- struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_inode_item *inode,
- u64 objectid, int checksum)
-{
- struct btrfs_key key;
-
- data->trans = trans;
- data->root = root;
- data->inode = inode;
- data->objectid = objectid;
- data->first_block = 0;
- data->disk_block = 0;
- data->num_blocks = 0;
- data->boundary = (u64)-1;
- data->checksum = checksum;
- data->errcode = 0;
-
- key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
- key.type = BTRFS_ROOT_ITEM_KEY;
- key.offset = (u64)-1;
- data->convert_root = btrfs_read_fs_root(root->fs_info, &key);
- /* Impossible as we just opened it before */
- BUG_ON(!data->convert_root || IS_ERR(data->convert_root));
- data->convert_ino = BTRFS_FIRST_FREE_OBJECTID + 1;
-}
-
-/*
- * Record a file extent in original filesystem into btrfs one.
- * The special point is, old disk_block can point to a reserved range.
- * So here, we don't use disk_block directly but search convert_root
- * to get the real disk_bytenr.
- */
-static int record_file_blocks(struct blk_iterate_data *data,
- u64 file_block, u64 disk_block, u64 num_blocks)
-{
- int ret = 0;
- struct btrfs_root *root = data->root;
- struct btrfs_root *convert_root = data->convert_root;
- struct btrfs_path path;
- u64 file_pos = file_block * root->sectorsize;
- u64 old_disk_bytenr = disk_block * root->sectorsize;
- u64 num_bytes = num_blocks * root->sectorsize;
- u64 cur_off = old_disk_bytenr;
-
- /* Hole, pass it to record_file_extent directly */
- if (old_disk_bytenr == 0)
- return btrfs_record_file_extent(data->trans, root,
- data->objectid, data->inode, file_pos, 0,
- num_bytes);
-
- btrfs_init_path(&path);
-
- /*
- * Search real disk bytenr from convert root
- */
- while (cur_off < old_disk_bytenr + num_bytes) {
- struct btrfs_key key;
- struct btrfs_file_extent_item *fi;
- struct extent_buffer *node;
- int slot;
- u64 extent_disk_bytenr;
- u64 extent_num_bytes;
- u64 real_disk_bytenr;
- u64 cur_len;
-
- key.objectid = data->convert_ino;
- key.type = BTRFS_EXTENT_DATA_KEY;
- key.offset = cur_off;
-
- ret = btrfs_search_slot(NULL, convert_root, &key, &path, 0, 0);
- if (ret < 0)
- break;
- if (ret > 0) {
- ret = btrfs_previous_item(convert_root, &path,
- data->convert_ino,
- BTRFS_EXTENT_DATA_KEY);
- if (ret < 0)
- break;
- if (ret > 0) {
- ret = -ENOENT;
- break;
- }
- }
- node = path.nodes[0];
- slot = path.slots[0];
- btrfs_item_key_to_cpu(node, &key, slot);
- BUG_ON(key.type != BTRFS_EXTENT_DATA_KEY ||
- key.objectid != data->convert_ino ||
- key.offset > cur_off);
- fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item);
- extent_disk_bytenr = btrfs_file_extent_disk_bytenr(node, fi);
- extent_num_bytes = btrfs_file_extent_num_bytes(node, fi);
- BUG_ON(cur_off - key.offset >= extent_num_bytes);
- btrfs_release_path(&path);
-
- if (extent_disk_bytenr)
- real_disk_bytenr = cur_off - key.offset +
- extent_disk_bytenr;
- else
- real_disk_bytenr = 0;
- cur_len = min(key.offset + extent_num_bytes,
- old_disk_bytenr + num_bytes) - cur_off;
- ret = btrfs_record_file_extent(data->trans, data->root,
- data->objectid, data->inode, file_pos,
- real_disk_bytenr, cur_len);
- if (ret < 0)
- break;
- cur_off += cur_len;
- file_pos += cur_len;
-
- /*
- * No need to care about csum
- * As every byte of old fs image is calculated for csum, no
- * need to waste CPU cycles now.
- */
- }
- btrfs_release_path(&path);
- return ret;
-}
-
-static int block_iterate_proc(u64 disk_block, u64 file_block,
- struct blk_iterate_data *idata)
-{
- int ret = 0;
- int sb_region;
- int do_barrier;
- struct btrfs_root *root = idata->root;
- struct btrfs_block_group_cache *cache;
- u64 bytenr = disk_block * root->sectorsize;
-
- sb_region = intersect_with_sb(bytenr, root->sectorsize);
- do_barrier = sb_region || disk_block >= idata->boundary;
- if ((idata->num_blocks > 0 && do_barrier) ||
- (file_block > idata->first_block + idata->num_blocks) ||
- (disk_block != idata->disk_block + idata->num_blocks)) {
- if (idata->num_blocks > 0) {
- ret = record_file_blocks(idata, idata->first_block,
- idata->disk_block,
- idata->num_blocks);
- if (ret)
- goto fail;
- idata->first_block += idata->num_blocks;
- idata->num_blocks = 0;
- }
- if (file_block > idata->first_block) {
- ret = record_file_blocks(idata, idata->first_block,
- 0, file_block - idata->first_block);
- if (ret)
- goto fail;
- }
-
- if (sb_region) {
- bytenr += BTRFS_STRIPE_LEN - 1;
- bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
- } else {
- cache = btrfs_lookup_block_group(root->fs_info, bytenr);
- BUG_ON(!cache);
- bytenr = cache->key.objectid + cache->key.offset;
- }
-
- idata->first_block = file_block;
- idata->disk_block = disk_block;
- idata->boundary = bytenr / root->sectorsize;
- }
- idata->num_blocks++;
-fail:
- return ret;
-}
-
static int create_image_file_range(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct cache_tree *used,
struct btrfs_inode_item *inode,
u64 ino, u64 bytenr, u64 *ret_len,
- int datacsum)
+ u32 convert_flags)
{
struct cache_extent *cache;
struct btrfs_block_group_cache *bg_cache;
u64 disk_bytenr;
int i;
int ret;
+ u32 datacsum = convert_flags & CONVERT_FLAG_DATACSUM;
- if (bytenr != round_down(bytenr, root->sectorsize)) {
+ if (bytenr != round_down(bytenr, root->fs_info->sectorsize)) {
error("bytenr not sectorsize aligned: %llu",
(unsigned long long)bytenr);
return -EINVAL;
}
- if (len != round_down(len, root->sectorsize)) {
+ if (len != round_down(len, root->fs_info->sectorsize)) {
error("length not sectorsize aligned: %llu",
(unsigned long long)len);
return -EINVAL;
len = min_t(u64, len, BTRFS_MAX_EXTENT_SIZE);
/*
- * Skip sb ranges first
- * [0, 1M), [sb_offset(1), +64K), [sb_offset(2), +64K].
+ * Skip reserved ranges first
*
* Or we will insert a hole into current image file, and later
* migrate block will fail as there is already a file extent.
*/
- if (bytenr < 1024 * 1024) {
- *ret_len = 1024 * 1024 - bytenr;
- return 0;
- }
- for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- u64 cur = btrfs_sb_offset(i);
+ for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++) {
+ const struct simple_range *reserved = &btrfs_reserved_ranges[i];
- if (bytenr >= cur && bytenr < cur + BTRFS_STRIPE_LEN) {
- *ret_len = cur + BTRFS_STRIPE_LEN - bytenr;
+ /*
+ * |-- reserved --|
+ * |--range---|
+ * or
+ * |---- reserved ----|
+ * |-- range --|
+ * Skip to reserved range end
+ */
+ if (bytenr >= reserved->start && bytenr < range_end(reserved)) {
+ *ret_len = range_end(reserved) - bytenr;
return 0;
}
- }
- for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- u64 cur = btrfs_sb_offset(i);
/*
- * |--reserved--|
+ * |---reserved---|
* |----range-------|
- * May still need to go through file extent inserts
+ * Leading part may still create a file extent
*/
- if (bytenr < cur && bytenr + len >= cur) {
- len = min_t(u64, len, cur - bytenr);
+ if (bytenr < reserved->start &&
+ bytenr + len >= range_end(reserved)) {
+ len = min_t(u64, len, reserved->start - bytenr);
break;
}
- /*
- * |--reserved--|
- * |---range---|
- * Drop out, no need to insert anything
- */
- if (bytenr >= cur && bytenr < cur + BTRFS_STRIPE_LEN) {
- *ret_len = cur + BTRFS_STRIPE_LEN - bytenr;
- return 0;
- }
}
+ /* Check if we are going to insert regular file extent, or hole */
cache = search_cache_extent(used, bytenr);
if (cache) {
if (cache->start <= bytenr) {
* |///////Used///////|
* |<--insert--->|
* bytenr
+ * Insert one real file extent
*/
len = min_t(u64, len, cache->start + cache->size -
bytenr);
* |//Used//|
* |<-insert-->|
* bytenr
+ * Insert one hole
*/
len = min(len, cache->start - bytenr);
disk_bytenr = 0;
* |//Used//| |EOF
* |<-insert-->|
* bytenr
+ * Insert one hole
*/
disk_bytenr = 0;
datacsum = 0;
bg_cache->key.offset - bytenr);
}
- if (len != round_down(len, root->sectorsize)) {
+ if (len != round_down(len, root->fs_info->sectorsize)) {
error("remaining length not sectorsize aligned: %llu",
(unsigned long long)len);
return -EINVAL;
struct btrfs_root *root,
struct cache_tree *used,
struct btrfs_inode_item *inode, int fd,
- u64 ino, u64 start, u64 len, int datacsum)
+ u64 ino, const struct simple_range *range,
+ u32 convert_flags)
{
- u64 cur_off = start;
- u64 cur_len = len;
- u64 hole_start = start;
+ u64 cur_off = range->start;
+ u64 cur_len = range->len;
+ u64 hole_start = range->start;
u64 hole_len;
struct cache_extent *cache;
struct btrfs_key key;
struct extent_buffer *eb;
int ret = 0;
- while (cur_off < start + len) {
- cache = lookup_cache_extent(used, cur_off, cur_len);
+ /*
+ * It's possible that there are holes in reserved range:
+ * |<---------------- Reserved range ---------------------->|
+ * |<- Old fs data ->| |<- Old fs data ->|
+ * So here we need to iterate through old fs used space and only
+ * migrate ranges that covered by old fs data.
+ */
+ while (cur_off < range_end(range)) {
+ cache = search_cache_extent(used, cur_off);
if (!cache)
break;
cur_off = max(cache->start, cur_off);
- cur_len = min(cache->start + cache->size, start + len) -
+ if (cur_off >= range_end(range))
+ break;
+ cur_len = min(cache->start + cache->size, range_end(range)) -
cur_off;
- BUG_ON(cur_len < root->sectorsize);
+ BUG_ON(cur_len < root->fs_info->sectorsize);
/* reserve extent for the data */
ret = btrfs_reserve_extent(trans, root, cur_len, 0, 0, (u64)-1,
eb->len = key.offset;
/* Write the data */
- ret = write_and_map_eb(trans, root, eb);
+ ret = write_and_map_eb(root->fs_info, eb);
free(eb);
if (ret < 0)
break;
if (ret < 0)
break;
/* Finally, insert csum items */
- if (datacsum)
+ if (convert_flags & CONVERT_FLAG_DATACSUM)
ret = csum_disk_extent(trans, root, key.objectid,
key.offset);
cur_off += key.offset;
hole_start = cur_off;
- cur_len = start + len - cur_off;
+ cur_len = range_end(range) - cur_off;
}
- /* Last hole */
- if (start + len - hole_start > 0)
+ /*
+ * Last hole
+ * |<---- reserved -------->|
+ * |<- Old fs data ->| |
+ * | Hole |
+ */
+ if (range_end(range) - hole_start > 0)
ret = btrfs_record_file_extent(trans, root, ino, inode,
- hole_start, 0, start + len - hole_start);
+ hole_start, 0, range_end(range) - hole_start);
return ret;
}
/*
- * Relocate the used ext2 data in reserved ranges
- * [0,1M)
- * [btrfs_sb_offset(1), +BTRFS_STRIPE_LEN)
- * [btrfs_sb_offset(2), +BTRFS_STRIPE_LEN)
+ * Relocate the used source fs data in reserved ranges
*/
static int migrate_reserved_ranges(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct cache_tree *used,
struct btrfs_inode_item *inode, int fd,
- u64 ino, u64 total_bytes, int datacsum)
+ u64 ino, u64 total_bytes, u32 convert_flags)
{
- u64 cur_off;
- u64 cur_len;
+ int i;
int ret = 0;
- /* 0 ~ 1M */
- cur_off = 0;
- cur_len = 1024 * 1024;
- ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino,
- cur_off, cur_len, datacsum);
- if (ret < 0)
- return ret;
+ for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++) {
+ const struct simple_range *range = &btrfs_reserved_ranges[i];
- /* second sb(fisrt sb is included in 0~1M) */
- cur_off = btrfs_sb_offset(1);
- cur_len = min(total_bytes, cur_off + BTRFS_STRIPE_LEN) - cur_off;
- if (cur_off > total_bytes)
- return ret;
- ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino,
- cur_off, cur_len, datacsum);
- if (ret < 0)
- return ret;
+ if (range->start > total_bytes)
+ return ret;
+ ret = migrate_one_reserved_range(trans, root, used, inode, fd,
+ ino, range, convert_flags);
+ if (ret < 0)
+ return ret;
+ }
- /* Last sb */
- cur_off = btrfs_sb_offset(2);
- cur_len = min(total_bytes, cur_off + BTRFS_STRIPE_LEN) - cur_off;
- if (cur_off > total_bytes)
- return ret;
- ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino,
- cur_off, cur_len, datacsum);
return ret;
}
static int wipe_reserved_ranges(struct cache_tree *tree, u64 min_stripe_size,
int ensure_size)
{
+ int i;
int ret;
- ret = wipe_one_reserved_range(tree, 0, 1024 * 1024, min_stripe_size,
- ensure_size);
- if (ret < 0)
- return ret;
- ret = wipe_one_reserved_range(tree, btrfs_sb_offset(1),
- BTRFS_STRIPE_LEN, min_stripe_size, ensure_size);
- if (ret < 0)
- return ret;
- ret = wipe_one_reserved_range(tree, btrfs_sb_offset(2),
- BTRFS_STRIPE_LEN, min_stripe_size, ensure_size);
+ for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++) {
+ const struct simple_range *range = &btrfs_reserved_ranges[i];
+
+ ret = wipe_one_reserved_range(tree, range->start, range->len,
+ min_stripe_size, ensure_size);
+ if (ret < 0)
+ return ret;
+ }
return ret;
}
static int calculate_available_space(struct btrfs_convert_context *cctx)
{
- struct cache_tree *used = &cctx->used;
+ struct cache_tree *used = &cctx->used_space;
struct cache_tree *data_chunks = &cctx->data_chunks;
- struct cache_tree *free = &cctx->free;
+ struct cache_tree *free = &cctx->free_space;
struct cache_extent *cache;
u64 cur_off = 0;
/*
* Twice the minimal chunk size, to allow later wipe_reserved_ranges()
* works without need to consider overlap
*/
- u64 min_stripe_size = 2 * 16 * 1024 * 1024;
+ u64 min_stripe_size = SZ_32M;
int ret;
/* Calculate data_chunks */
static int create_image(struct btrfs_root *root,
struct btrfs_mkfs_config *cfg,
struct btrfs_convert_context *cctx, int fd,
- u64 size, char *name, int datacsum)
+ u64 size, char *name, u32 convert_flags)
{
struct btrfs_inode_item buf;
struct btrfs_trans_handle *trans;
u64 flags = BTRFS_INODE_READONLY;
int ret;
- if (!datacsum)
+ if (!(convert_flags & CONVERT_FLAG_DATACSUM))
flags |= BTRFS_INODE_NODATASUM;
trans = btrfs_start_transaction(root, 1);
- if (!trans)
- return -ENOMEM;
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
cache_tree_init(&used_tmp);
btrfs_init_path(&path);
if (ret < 0)
goto out;
ret = btrfs_add_link(trans, root, ino, BTRFS_FIRST_FREE_OBJECTID, name,
- strlen(name), BTRFS_FT_REG_FILE, NULL, 1);
+ strlen(name), BTRFS_FT_REG_FILE, NULL, 1, 0);
if (ret < 0)
goto out;
* Create a new used space cache, which doesn't contain the reserved
* range
*/
- for (cache = first_cache_extent(&cctx->used); cache;
+ for (cache = first_cache_extent(&cctx->used_space); cache;
cache = next_cache_extent(cache)) {
ret = add_cache_extent(&used_tmp, cache->start, cache->size);
if (ret < 0)
* Start from 1M, as 0~1M is reserved, and create_image_file_range()
* can't handle bytenr 0(will consider it as a hole)
*/
- cur = 1024 * 1024;
+ cur = SZ_1M;
while (cur < size) {
u64 len = size - cur;
ret = create_image_file_range(trans, root, &used_tmp,
- &buf, ino, cur, &len, datacsum);
+ &buf, ino, cur, &len,
+ convert_flags);
if (ret < 0)
goto out;
cur += len;
}
/* Handle the reserved ranges */
- ret = migrate_reserved_ranges(trans, root, &cctx->used, &buf, fd, ino,
- cfg->num_bytes, datacsum);
-
+ ret = migrate_reserved_ranges(trans, root, &cctx->used_space, &buf, fd,
+ ino, cfg->num_bytes, convert_flags);
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
return ret;
}
-static struct btrfs_root* link_subvol(struct btrfs_root *root,
- const char *base, u64 root_objectid)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_fs_info *fs_info = root->fs_info;
- struct btrfs_root *tree_root = fs_info->tree_root;
- struct btrfs_root *new_root = NULL;
- struct btrfs_path path;
- struct btrfs_inode_item *inode_item;
- struct extent_buffer *leaf;
- struct btrfs_key key;
- u64 dirid = btrfs_root_dirid(&root->root_item);
- u64 index = 2;
- char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
- int len;
- int i;
- int ret;
-
- len = strlen(base);
- if (len == 0 || len > BTRFS_NAME_LEN)
- return NULL;
-
- btrfs_init_path(&path);
- key.objectid = dirid;
- key.type = BTRFS_DIR_INDEX_KEY;
- key.offset = (u64)-1;
-
- ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
- if (ret <= 0) {
- error("search for DIR_INDEX dirid %llu failed: %d",
- (unsigned long long)dirid, ret);
- goto fail;
- }
-
- if (path.slots[0] > 0) {
- path.slots[0]--;
- btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
- if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
- index = key.offset + 1;
- }
- btrfs_release_path(&path);
-
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- error("unable to start transaction");
- goto fail;
- }
-
- key.objectid = dirid;
- key.offset = 0;
- key.type = BTRFS_INODE_ITEM_KEY;
-
- ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
- if (ret) {
- error("search for INODE_ITEM %llu failed: %d",
- (unsigned long long)dirid, ret);
- goto fail;
- }
- leaf = path.nodes[0];
- inode_item = btrfs_item_ptr(leaf, path.slots[0],
- struct btrfs_inode_item);
-
- key.objectid = root_objectid;
- key.offset = (u64)-1;
- key.type = BTRFS_ROOT_ITEM_KEY;
-
- memcpy(buf, base, len);
- for (i = 0; i < 1024; i++) {
- ret = btrfs_insert_dir_item(trans, root, buf, len,
- dirid, &key, BTRFS_FT_DIR, index);
- if (ret != -EEXIST)
- break;
- len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
- if (len < 1 || len > BTRFS_NAME_LEN) {
- ret = -EINVAL;
- break;
- }
- }
- if (ret)
- goto fail;
-
- btrfs_set_inode_size(leaf, inode_item, len * 2 +
- btrfs_inode_size(leaf, inode_item));
- btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(&path);
-
- /* add the backref first */
- ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
- BTRFS_ROOT_BACKREF_KEY,
- root->root_key.objectid,
- dirid, index, buf, len);
- if (ret) {
- error("unable to add root backref for %llu: %d",
- root->root_key.objectid, ret);
- goto fail;
- }
-
- /* now add the forward ref */
- ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
- BTRFS_ROOT_REF_KEY, root_objectid,
- dirid, index, buf, len);
- if (ret) {
- error("unable to add root ref for %llu: %d",
- root->root_key.objectid, ret);
- goto fail;
- }
-
- ret = btrfs_commit_transaction(trans, root);
- if (ret) {
- error("transaction commit failed: %d", ret);
- goto fail;
- }
-
- new_root = btrfs_read_fs_root(fs_info, &key);
- if (IS_ERR(new_root)) {
- error("unable to fs read root: %lu", PTR_ERR(new_root));
- new_root = NULL;
- }
-fail:
- btrfs_init_path(&path);
- return new_root;
-}
-
static int create_subvol(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 root_objectid)
{
* And for single chunk, don't create chunk larger than 1G.
*/
max_chunk_size = cfg->num_bytes / 10;
- max_chunk_size = min((u64)(1024 * 1024 * 1024), max_chunk_size);
- max_chunk_size = round_down(max_chunk_size, extent_root->sectorsize);
+ max_chunk_size = min((u64)(SZ_1G), max_chunk_size);
+ max_chunk_size = round_down(max_chunk_size,
+ extent_root->fs_info->sectorsize);
for (cache = first_cache_extent(data_chunks); cache;
cache = next_cache_extent(cache)) {
len = min(max_chunk_size,
cache->start + cache->size - cur);
- ret = btrfs_alloc_data_chunk(trans, extent_root,
+ ret = btrfs_alloc_data_chunk(trans, fs_info,
&cur_backup, len,
BTRFS_BLOCK_GROUP_DATA, 1);
if (ret < 0)
break;
- ret = btrfs_make_block_group(trans, extent_root, 0,
+ ret = btrfs_make_block_group(trans, fs_info, 0,
BTRFS_BLOCK_GROUP_DATA,
BTRFS_FIRST_CHUNK_TREE_OBJECTID,
cur, len);
* But the convert image subvolume is *NOT* linked to fs tree yet.
*/
static int init_btrfs(struct btrfs_mkfs_config *cfg, struct btrfs_root *root,
- struct btrfs_convert_context *cctx, int datacsum,
- int packing, int noxattr)
+ struct btrfs_convert_context *cctx, u32 convert_flags)
{
struct btrfs_key location;
struct btrfs_trans_handle *trans;
fs_info->avoid_sys_chunk_alloc = 1;
fs_info->avoid_meta_chunk_alloc = 1;
trans = btrfs_start_transaction(root, 1);
- if (!trans) {
+ if (IS_ERR(trans)) {
error("unable to start transaction");
- ret = -EINVAL;
+ ret = PTR_ERR(trans);
goto err;
}
ret = btrfs_fix_block_accounting(trans, root);
return ret;
}
-static int prepare_system_chunk_sb(struct btrfs_super_block *super)
+static int convert_open_fs(const char *devname,
+ struct btrfs_convert_context *cctx)
{
- struct btrfs_chunk *chunk;
- struct btrfs_disk_key *key;
- u32 sectorsize = btrfs_super_sectorsize(super);
-
- key = (struct btrfs_disk_key *)(super->sys_chunk_array);
- chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
- sizeof(struct btrfs_disk_key));
-
- btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
- btrfs_set_disk_key_offset(key, 0);
-
- btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
- btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
- btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
- btrfs_set_stack_chunk_io_align(chunk, sectorsize);
- btrfs_set_stack_chunk_io_width(chunk, sectorsize);
- btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
- btrfs_set_stack_chunk_num_stripes(chunk, 1);
- btrfs_set_stack_chunk_sub_stripes(chunk, 0);
- chunk->stripe.devid = super->dev_item.devid;
- btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
- memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
- btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
- return 0;
-}
-
-#if BTRFSCONVERT_EXT2
+ int i;
-/*
- * Open Ext2fs in readonly mode, read block allocation bitmap and
- * inode bitmap into memory.
- */
-static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name)
-{
- errcode_t ret;
- ext2_filsys ext2_fs;
- ext2_ino_t ino;
- u32 ro_feature;
+ for (i = 0; i < ARRAY_SIZE(convert_operations); i++) {
+ int ret = convert_operations[i]->open_fs(cctx, devname);
- ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
- if (ret) {
- fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
- return -1;
- }
- /*
- * We need to know exactly the used space, some RO compat flags like
- * BIGALLOC will affect how used space is present.
- * So we need manuall check any unsupported RO compat flags
- */
- ro_feature = ext2_fs->super->s_feature_ro_compat;
- if (ro_feature & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
- error(
-"unsupported RO features detected: %x, abort convert to avoid possible corruption",
- ro_feature & ~EXT2_LIB_FEATURE_COMPAT_SUPP);
- goto fail;
- }
- ret = ext2fs_read_inode_bitmap(ext2_fs);
- if (ret) {
- fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
- error_message(ret));
- goto fail;
- }
- ret = ext2fs_read_block_bitmap(ext2_fs);
- if (ret) {
- fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
- error_message(ret));
- goto fail;
- }
- /*
- * search each block group for a free inode. this set up
- * uninit block/inode bitmaps appropriately.
- */
- ino = 1;
- while (ino <= ext2_fs->super->s_inodes_count) {
- ext2_ino_t foo;
- ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
- ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
- }
-
- if (!(ext2_fs->super->s_feature_incompat &
- EXT2_FEATURE_INCOMPAT_FILETYPE)) {
- error("filetype feature is missing");
- goto fail;
- }
-
- cctx->fs_data = ext2_fs;
- cctx->blocksize = ext2_fs->blocksize;
- cctx->block_count = ext2_fs->super->s_blocks_count;
- cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count;
- cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16);
- cctx->first_data_block = ext2_fs->super->s_first_data_block;
- cctx->inodes_count = ext2_fs->super->s_inodes_count;
- cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count;
- return 0;
-fail:
- ext2fs_close(ext2_fs);
- return -1;
-}
-
-static int __ext2_add_one_block(ext2_filsys fs, char *bitmap,
- unsigned long group_nr, struct cache_tree *used)
-{
- unsigned long offset;
- unsigned i;
- int ret = 0;
-
- offset = fs->super->s_first_data_block;
- offset /= EXT2FS_CLUSTER_RATIO(fs);
- offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super);
- for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) {
- if ((i + offset) >= ext2fs_blocks_count(fs->super))
- break;
-
- if (ext2fs_test_bit(i, bitmap)) {
- u64 start;
-
- start = (i + offset) * EXT2FS_CLUSTER_RATIO(fs);
- start *= fs->blocksize;
- ret = add_merge_cache_extent(used, start,
- fs->blocksize);
- if (ret < 0)
- break;
- }
- }
- return ret;
-}
-
-/*
- * Read all used ext2 space into cctx->used cache tree
- */
-static int ext2_read_used_space(struct btrfs_convert_context *cctx)
-{
- ext2_filsys fs = (ext2_filsys)cctx->fs_data;
- blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
- struct cache_tree *used_tree = &cctx->used;
- char *block_bitmap = NULL;
- unsigned long i;
- int block_nbytes;
- int ret = 0;
-
- block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
- /* Shouldn't happen */
- BUG_ON(!fs->block_map);
-
- block_bitmap = malloc(block_nbytes);
- if (!block_bitmap)
- return -ENOMEM;
-
- for (i = 0; i < fs->group_desc_count; i++) {
- ret = ext2fs_get_block_bitmap_range(fs->block_map, blk_itr,
- block_nbytes * 8, block_bitmap);
- if (ret) {
- error("fail to get bitmap from ext2, %s",
- strerror(-ret));
- break;
- }
- ret = __ext2_add_one_block(fs, block_bitmap, i, used_tree);
- if (ret < 0) {
- error("fail to build used space tree, %s",
- strerror(-ret));
- break;
- }
- blk_itr += EXT2_CLUSTERS_PER_GROUP(fs->super);
- }
-
- free(block_bitmap);
- return ret;
-}
-
-static void ext2_close_fs(struct btrfs_convert_context *cctx)
-{
- if (cctx->volume_name) {
- free(cctx->volume_name);
- cctx->volume_name = NULL;
- }
- ext2fs_close(cctx->fs_data);
-}
-
-struct dir_iterate_data {
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root;
- struct btrfs_inode_item *inode;
- u64 objectid;
- u64 index_cnt;
- u64 parent;
- int errcode;
-};
-
-static u8 ext2_filetype_conversion_table[EXT2_FT_MAX] = {
- [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
- [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
- [EXT2_FT_DIR] = BTRFS_FT_DIR,
- [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
- [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
- [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
- [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
- [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
-};
-
-static int ext2_dir_iterate_proc(ext2_ino_t dir, int entry,
- struct ext2_dir_entry *dirent,
- int offset, int blocksize,
- char *buf,void *priv_data)
-{
- int ret;
- int file_type;
- u64 objectid;
- char dotdot[] = "..";
- struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
- int name_len;
-
- name_len = dirent->name_len & 0xFF;
-
- objectid = dirent->inode + INO_OFFSET;
- if (!strncmp(dirent->name, dotdot, name_len)) {
- if (name_len == 2) {
- BUG_ON(idata->parent != 0);
- idata->parent = objectid;
- }
- return 0;
- }
- if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
- return 0;
-
- file_type = dirent->name_len >> 8;
- BUG_ON(file_type > EXT2_FT_SYMLINK);
-
- ret = convert_insert_dirent(idata->trans, idata->root, dirent->name,
- name_len, idata->objectid, objectid,
- ext2_filetype_conversion_table[file_type],
- idata->index_cnt, idata->inode);
- if (ret < 0) {
- idata->errcode = ret;
- return BLOCK_ABORT;
- }
-
- idata->index_cnt++;
- return 0;
-}
-
-static int ext2_create_dir_entries(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 objectid,
- struct btrfs_inode_item *btrfs_inode,
- ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
-{
- int ret;
- errcode_t err;
- struct dir_iterate_data data = {
- .trans = trans,
- .root = root,
- .inode = btrfs_inode,
- .objectid = objectid,
- .index_cnt = 2,
- .parent = 0,
- .errcode = 0,
- };
-
- err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
- ext2_dir_iterate_proc, &data);
- if (err)
- goto error;
- ret = data.errcode;
- if (ret == 0 && data.parent == objectid) {
- ret = btrfs_insert_inode_ref(trans, root, "..", 2,
- objectid, objectid, 0);
- }
- return ret;
-error:
- fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
- return -1;
-}
-
-static int ext2_block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
- e2_blkcnt_t blockcnt, blk_t ref_block,
- int ref_offset, void *priv_data)
-{
- int ret;
- struct blk_iterate_data *idata;
- idata = (struct blk_iterate_data *)priv_data;
- ret = block_iterate_proc(*blocknr, blockcnt, idata);
- if (ret) {
- idata->errcode = ret;
- return BLOCK_ABORT;
- }
- return 0;
-}
-
-/*
- * traverse file's data blocks, record these data blocks as file extents.
- */
-static int ext2_create_file_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 objectid,
- struct btrfs_inode_item *btrfs_inode,
- ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
- int datacsum, int packing)
-{
- int ret;
- char *buffer = NULL;
- errcode_t err;
- u32 last_block;
- u32 sectorsize = root->sectorsize;
- u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
- struct blk_iterate_data data;
-
- init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
- datacsum);
-
- err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
- NULL, ext2_block_iterate_proc, &data);
- if (err)
- goto error;
- ret = data.errcode;
- if (ret)
- goto fail;
- if (packing && data.first_block == 0 && data.num_blocks > 0 &&
- inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
- u64 num_bytes = data.num_blocks * sectorsize;
- u64 disk_bytenr = data.disk_block * sectorsize;
- u64 nbytes;
-
- buffer = malloc(num_bytes);
- if (!buffer)
- return -ENOMEM;
- ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
- if (ret)
- goto fail;
- if (num_bytes > inode_size)
- num_bytes = inode_size;
- ret = btrfs_insert_inline_extent(trans, root, objectid,
- 0, buffer, num_bytes);
- if (ret)
- goto fail;
- nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
- btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
- } else if (data.num_blocks > 0) {
- ret = record_file_blocks(&data, data.first_block,
- data.disk_block, data.num_blocks);
- if (ret)
- goto fail;
- }
- data.first_block += data.num_blocks;
- last_block = (inode_size + sectorsize - 1) / sectorsize;
- if (last_block > data.first_block) {
- ret = record_file_blocks(&data, data.first_block, 0,
- last_block - data.first_block);
- }
-fail:
- free(buffer);
- return ret;
-error:
- fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
- return -1;
-}
-
-static int ext2_create_symbol_link(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 objectid,
- struct btrfs_inode_item *btrfs_inode,
- ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
- struct ext2_inode *ext2_inode)
-{
- int ret;
- char *pathname;
- u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
- if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
- btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
- ret = ext2_create_file_extents(trans, root, objectid,
- btrfs_inode, ext2_fs, ext2_ino, 1, 1);
- btrfs_set_stack_inode_size(btrfs_inode, inode_size);
- return ret;
- }
-
- pathname = (char *)&(ext2_inode->i_block[0]);
- BUG_ON(pathname[inode_size] != 0);
- ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
- pathname, inode_size + 1);
- btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
- return ret;
-}
-
-/*
- * Following xattr/acl related codes are based on codes in
- * fs/ext3/xattr.c and fs/ext3/acl.c
- */
-#define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
-#define EXT2_XATTR_BFIRST(ptr) \
- ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
-#define EXT2_XATTR_IHDR(inode) \
- ((struct ext2_ext_attr_header *) ((void *)(inode) + \
- EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
-#define EXT2_XATTR_IFIRST(inode) \
- ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
- sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
-
-static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
- const void *end)
-{
- struct ext2_ext_attr_entry *next;
-
- while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
- next = EXT2_EXT_ATTR_NEXT(entry);
- if ((void *)next >= end)
- return -EIO;
- entry = next;
- }
- return 0;
-}
-
-static int ext2_xattr_check_block(const char *buf, size_t size)
-{
- int error;
- struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
-
- if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
- header->h_blocks != 1)
- return -EIO;
- error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
- return error;
-}
-
-static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
- size_t size)
-{
- size_t value_size = entry->e_value_size;
-
- if (entry->e_value_block != 0 || value_size > size ||
- entry->e_value_offs + value_size > size)
- return -EIO;
- return 0;
-}
-
-#define EXT2_ACL_VERSION 0x0001
-
-/* 23.2.5 acl_tag_t values */
-
-#define ACL_UNDEFINED_TAG (0x00)
-#define ACL_USER_OBJ (0x01)
-#define ACL_USER (0x02)
-#define ACL_GROUP_OBJ (0x04)
-#define ACL_GROUP (0x08)
-#define ACL_MASK (0x10)
-#define ACL_OTHER (0x20)
-
-/* 23.2.7 ACL qualifier constants */
-
-#define ACL_UNDEFINED_ID ((id_t)-1)
-
-typedef struct {
- __le16 e_tag;
- __le16 e_perm;
- __le32 e_id;
-} ext2_acl_entry;
-
-typedef struct {
- __le16 e_tag;
- __le16 e_perm;
-} ext2_acl_entry_short;
-
-typedef struct {
- __le32 a_version;
-} ext2_acl_header;
-
-static inline int ext2_acl_count(size_t size)
-{
- ssize_t s;
- size -= sizeof(ext2_acl_header);
- s = size - 4 * sizeof(ext2_acl_entry_short);
- if (s < 0) {
- if (size % sizeof(ext2_acl_entry_short))
- return -1;
- return size / sizeof(ext2_acl_entry_short);
- } else {
- if (s % sizeof(ext2_acl_entry))
- return -1;
- return s / sizeof(ext2_acl_entry) + 4;
- }
-}
-
-#define ACL_EA_VERSION 0x0002
-
-typedef struct {
- __le16 e_tag;
- __le16 e_perm;
- __le32 e_id;
-} acl_ea_entry;
-
-typedef struct {
- __le32 a_version;
- acl_ea_entry a_entries[0];
-} acl_ea_header;
-
-static inline size_t acl_ea_size(int count)
-{
- return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
-}
-
-static int ext2_acl_to_xattr(void *dst, const void *src,
- size_t dst_size, size_t src_size)
-{
- int i, count;
- const void *end = src + src_size;
- acl_ea_header *ext_acl = (acl_ea_header *)dst;
- acl_ea_entry *dst_entry = ext_acl->a_entries;
- ext2_acl_entry *src_entry;
-
- if (src_size < sizeof(ext2_acl_header))
- goto fail;
- if (((ext2_acl_header *)src)->a_version !=
- cpu_to_le32(EXT2_ACL_VERSION))
- goto fail;
- src += sizeof(ext2_acl_header);
- count = ext2_acl_count(src_size);
- if (count <= 0)
- goto fail;
-
- BUG_ON(dst_size < acl_ea_size(count));
- ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
- for (i = 0; i < count; i++, dst_entry++) {
- src_entry = (ext2_acl_entry *)src;
- if (src + sizeof(ext2_acl_entry_short) > end)
- goto fail;
- dst_entry->e_tag = src_entry->e_tag;
- dst_entry->e_perm = src_entry->e_perm;
- switch (le16_to_cpu(src_entry->e_tag)) {
- case ACL_USER_OBJ:
- case ACL_GROUP_OBJ:
- case ACL_MASK:
- case ACL_OTHER:
- src += sizeof(ext2_acl_entry_short);
- dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
- break;
- case ACL_USER:
- case ACL_GROUP:
- src += sizeof(ext2_acl_entry);
- if (src > end)
- goto fail;
- dst_entry->e_id = src_entry->e_id;
- break;
- default:
- goto fail;
- }
- }
- if (src != end)
- goto fail;
- return 0;
-fail:
- return -EINVAL;
-}
-
-static char *xattr_prefix_table[] = {
- [1] = "user.",
- [2] = "system.posix_acl_access",
- [3] = "system.posix_acl_default",
- [4] = "trusted.",
- [6] = "security.",
-};
-
-static int ext2_copy_single_xattr(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 objectid,
- struct ext2_ext_attr_entry *entry,
- const void *data, u32 datalen)
-{
- int ret = 0;
- int name_len;
- int name_index;
- void *databuf = NULL;
- char namebuf[XATTR_NAME_MAX + 1];
-
- name_index = entry->e_name_index;
- if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
- xattr_prefix_table[name_index] == NULL)
- return -EOPNOTSUPP;
- name_len = strlen(xattr_prefix_table[name_index]) +
- entry->e_name_len;
- if (name_len >= sizeof(namebuf))
- return -ERANGE;
-
- if (name_index == 2 || name_index == 3) {
- size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
- databuf = malloc(bufsize);
- if (!databuf)
- return -ENOMEM;
- ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
- if (ret)
- goto out;
- data = databuf;
- datalen = bufsize;
- }
- strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
- strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
- if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
- sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
- fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
- objectid - INO_OFFSET, name_len, namebuf);
- goto out;
- }
- ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
- data, datalen, objectid);
-out:
- free(databuf);
- return ret;
-}
-
-static int ext2_copy_extended_attrs(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 objectid,
- struct btrfs_inode_item *btrfs_inode,
- ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
-{
- int ret = 0;
- int inline_ea = 0;
- errcode_t err;
- u32 datalen;
- u32 block_size = ext2_fs->blocksize;
- u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
- struct ext2_inode_large *ext2_inode;
- struct ext2_ext_attr_entry *entry;
- void *data;
- char *buffer = NULL;
- char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
-
- if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
- ext2_inode = (struct ext2_inode_large *)inode_buf;
- } else {
- ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
- if (!ext2_inode)
- return -ENOMEM;
- }
- err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
- inode_size);
- if (err) {
- fprintf(stderr, "ext2fs_read_inode_full: %s\n",
- error_message(err));
- ret = -1;
- goto out;
- }
-
- if (ext2_ino > ext2_fs->super->s_first_ino &&
- inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
- if (EXT2_GOOD_OLD_INODE_SIZE +
- ext2_inode->i_extra_isize > inode_size) {
- ret = -EIO;
- goto out;
- }
- if (ext2_inode->i_extra_isize != 0 &&
- EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
- EXT2_EXT_ATTR_MAGIC) {
- inline_ea = 1;
- }
- }
- if (inline_ea) {
- int total;
- void *end = (void *)ext2_inode + inode_size;
- entry = EXT2_XATTR_IFIRST(ext2_inode);
- total = end - (void *)entry;
- ret = ext2_xattr_check_names(entry, end);
- if (ret)
- goto out;
- while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
- ret = ext2_xattr_check_entry(entry, total);
- if (ret)
- goto out;
- data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
- entry->e_value_offs;
- datalen = entry->e_value_size;
- ret = ext2_copy_single_xattr(trans, root, objectid,
- entry, data, datalen);
- if (ret)
- goto out;
- entry = EXT2_EXT_ATTR_NEXT(entry);
- }
- }
-
- if (ext2_inode->i_file_acl == 0)
- goto out;
-
- buffer = malloc(block_size);
- if (!buffer) {
- ret = -ENOMEM;
- goto out;
- }
- err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
- if (err) {
- fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
- error_message(err));
- ret = -1;
- goto out;
- }
- ret = ext2_xattr_check_block(buffer, block_size);
- if (ret)
- goto out;
-
- entry = EXT2_XATTR_BFIRST(buffer);
- while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
- ret = ext2_xattr_check_entry(entry, block_size);
- if (ret)
- goto out;
- data = buffer + entry->e_value_offs;
- datalen = entry->e_value_size;
- ret = ext2_copy_single_xattr(trans, root, objectid,
- entry, data, datalen);
- if (ret)
- goto out;
- entry = EXT2_EXT_ATTR_NEXT(entry);
- }
-out:
- free(buffer);
- if ((void *)ext2_inode != inode_buf)
- free(ext2_inode);
- return ret;
-}
-#define MINORBITS 20
-#define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
-
-static inline dev_t old_decode_dev(u16 val)
-{
- return MKDEV((val >> 8) & 255, val & 255);
-}
-
-static inline dev_t new_decode_dev(u32 dev)
-{
- unsigned major = (dev & 0xfff00) >> 8;
- unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
- return MKDEV(major, minor);
-}
-
-static void ext2_copy_inode_item(struct btrfs_inode_item *dst,
- struct ext2_inode *src, u32 blocksize)
-{
- btrfs_set_stack_inode_generation(dst, 1);
- btrfs_set_stack_inode_sequence(dst, 0);
- btrfs_set_stack_inode_transid(dst, 1);
- btrfs_set_stack_inode_size(dst, src->i_size);
- btrfs_set_stack_inode_nbytes(dst, 0);
- btrfs_set_stack_inode_block_group(dst, 0);
- btrfs_set_stack_inode_nlink(dst, src->i_links_count);
- btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
- btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
- btrfs_set_stack_inode_mode(dst, src->i_mode);
- btrfs_set_stack_inode_rdev(dst, 0);
- btrfs_set_stack_inode_flags(dst, 0);
- btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
- btrfs_set_stack_timespec_nsec(&dst->atime, 0);
- btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
- btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
- btrfs_set_stack_timespec_sec(&dst->mtime, src->i_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->i_mode)) {
- btrfs_set_stack_inode_size(dst, 0);
- btrfs_set_stack_inode_nlink(dst, 1);
- }
- if (S_ISREG(src->i_mode)) {
- btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
- (u64)src->i_size);
- }
- if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
- !S_ISLNK(src->i_mode)) {
- if (src->i_block[0]) {
- btrfs_set_stack_inode_rdev(dst,
- old_decode_dev(src->i_block[0]));
- } else {
- btrfs_set_stack_inode_rdev(dst,
- new_decode_dev(src->i_block[1]));
- }
- }
- memset(&dst->reserved, 0, sizeof(dst->reserved));
-}
-static int ext2_check_state(struct btrfs_convert_context *cctx)
-{
- ext2_filsys fs = cctx->fs_data;
-
- if (!(fs->super->s_state & EXT2_VALID_FS))
- return 1;
- else if (fs->super->s_state & EXT2_ERROR_FS)
- return 1;
- else
- return 0;
-}
-
-/* EXT2_*_FL to BTRFS_INODE_FLAG_* stringification helper */
-#define COPY_ONE_EXT2_FLAG(flags, ext2_inode, name) ({ \
- if (ext2_inode->i_flags & EXT2_##name##_FL) \
- flags |= BTRFS_INODE_##name; \
-})
-
-/*
- * Convert EXT2_*_FL to corresponding BTRFS_INODE_* flags
- *
- * Only a subset of EXT_*_FL is supported in btrfs.
- */
-static void ext2_convert_inode_flags(struct btrfs_inode_item *dst,
- struct ext2_inode *src)
-{
- u64 flags = 0;
-
- COPY_ONE_EXT2_FLAG(flags, src, APPEND);
- COPY_ONE_EXT2_FLAG(flags, src, SYNC);
- COPY_ONE_EXT2_FLAG(flags, src, IMMUTABLE);
- COPY_ONE_EXT2_FLAG(flags, src, NODUMP);
- COPY_ONE_EXT2_FLAG(flags, src, NOATIME);
- COPY_ONE_EXT2_FLAG(flags, src, DIRSYNC);
- btrfs_set_stack_inode_flags(dst, flags);
-}
-
-/*
- * copy a single inode. do all the required works, such as cloning
- * inode item, creating file extents and creating directory entries.
- */
-static int ext2_copy_single_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 objectid,
- ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
- struct ext2_inode *ext2_inode,
- int datacsum, int packing, int noxattr)
-{
- int ret;
- struct btrfs_inode_item btrfs_inode;
-
- if (ext2_inode->i_links_count == 0)
- return 0;
-
- ext2_copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
- if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
- u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
- BTRFS_INODE_NODATASUM;
- btrfs_set_stack_inode_flags(&btrfs_inode, flags);
- }
- ext2_convert_inode_flags(&btrfs_inode, ext2_inode);
-
- switch (ext2_inode->i_mode & S_IFMT) {
- case S_IFREG:
- ret = ext2_create_file_extents(trans, root, objectid,
- &btrfs_inode, ext2_fs, ext2_ino, datacsum, packing);
- break;
- case S_IFDIR:
- ret = ext2_create_dir_entries(trans, root, objectid,
- &btrfs_inode, ext2_fs, ext2_ino);
- break;
- case S_IFLNK:
- ret = ext2_create_symbol_link(trans, root, objectid,
- &btrfs_inode, ext2_fs, ext2_ino, ext2_inode);
- break;
- default:
- ret = 0;
- break;
- }
- if (ret)
- return ret;
-
- if (!noxattr) {
- ret = ext2_copy_extended_attrs(trans, root, objectid,
- &btrfs_inode, ext2_fs, ext2_ino);
- if (ret)
- return ret;
- }
- return btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
-}
-
-/*
- * scan ext2's inode bitmap and copy all used inodes.
- */
-static int ext2_copy_inodes(struct btrfs_convert_context *cctx,
- struct btrfs_root *root,
- int datacsum, int packing, int noxattr, struct task_ctx *p)
-{
- ext2_filsys ext2_fs = cctx->fs_data;
- int ret;
- errcode_t err;
- ext2_inode_scan ext2_scan;
- struct ext2_inode ext2_inode;
- ext2_ino_t ext2_ino;
- u64 objectid;
- struct btrfs_trans_handle *trans;
-
- trans = btrfs_start_transaction(root, 1);
- if (!trans)
- return -ENOMEM;
- err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
- if (err) {
- fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
- return -1;
- }
- while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
- &ext2_inode))) {
- /* no more inodes */
- if (ext2_ino == 0)
- break;
- /* skip special inode in ext2fs */
- if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
- ext2_ino != EXT2_ROOT_INO)
- continue;
- objectid = ext2_ino + INO_OFFSET;
- ret = ext2_copy_single_inode(trans, root,
- objectid, ext2_fs, ext2_ino,
- &ext2_inode, datacsum, packing,
- noxattr);
- p->cur_copy_inodes++;
- if (ret)
- return ret;
- if (trans->blocks_used >= 4096) {
- ret = btrfs_commit_transaction(trans, root);
- BUG_ON(ret);
- trans = btrfs_start_transaction(root, 1);
- BUG_ON(!trans);
- }
- }
- if (err) {
- fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
- return -1;
- }
- ret = btrfs_commit_transaction(trans, root);
- BUG_ON(ret);
- ext2fs_close_inode_scan(ext2_scan);
-
- return ret;
-}
-
-static const struct btrfs_convert_operations ext2_convert_ops = {
- .name = "ext2",
- .open_fs = ext2_open_fs,
- .read_used_space = ext2_read_used_space,
- .copy_inodes = ext2_copy_inodes,
- .close_fs = ext2_close_fs,
- .check_state = ext2_check_state,
-};
-
-#endif
-
-static const struct btrfs_convert_operations *convert_operations[] = {
-#if BTRFSCONVERT_EXT2
- &ext2_convert_ops,
-#endif
-};
-
-static int convert_open_fs(const char *devname,
- struct btrfs_convert_context *cctx)
-{
- int i;
-
- memset(cctx, 0, sizeof(*cctx));
-
- for (i = 0; i < ARRAY_SIZE(convert_operations); i++) {
- int ret = convert_operations[i]->open_fs(cctx, devname);
-
- if (ret == 0) {
- cctx->convert_ops = convert_operations[i];
- return ret;
- }
+ if (ret == 0) {
+ cctx->convert_ops = convert_operations[i];
+ return ret;
+ }
}
error("no file system found to convert");
return -1;
}
-static int do_convert(const char *devname, int datacsum, int packing,
- int noxattr, u32 nodesize, int copylabel, const char *fslabel,
- int progress, u64 features)
+static int do_convert(const char *devname, u32 convert_flags, u32 nodesize,
+ const char *fslabel, int progress, u64 features)
{
int ret;
int fd = -1;
struct btrfs_root *image_root;
struct btrfs_convert_context cctx;
struct btrfs_key key;
- char *subvol_name = NULL;
+ char subvol_name[SOURCE_FS_NAME_LEN + 8];
struct task_ctx ctx;
char features_buf[64];
struct btrfs_mkfs_config mkfs_cfg;
printf("\tnodesize: %u\n", nodesize);
printf("\tfeatures: %s\n", features_buf);
+ memset(&mkfs_cfg, 0, sizeof(mkfs_cfg));
mkfs_cfg.label = cctx.volume_name;
mkfs_cfg.num_bytes = total_bytes;
mkfs_cfg.nodesize = nodesize;
mkfs_cfg.sectorsize = blocksize;
mkfs_cfg.stripesize = blocksize;
mkfs_cfg.features = features;
- /* New convert need these space */
- memset(mkfs_cfg.chunk_uuid, 0, BTRFS_UUID_UNPARSED_SIZE);
- memset(mkfs_cfg.fs_uuid, 0, BTRFS_UUID_UNPARSED_SIZE);
ret = make_convert_btrfs(fd, &mkfs_cfg, &cctx);
if (ret) {
error("unable to open ctree");
goto fail;
}
- ret = init_btrfs(&mkfs_cfg, root, &cctx, datacsum, packing, noxattr);
+ ret = init_btrfs(&mkfs_cfg, root, &cctx, convert_flags);
if (ret) {
error("unable to setup the root tree: %d", ret);
goto fail;
}
printf("creating %s image file\n", cctx.convert_ops->name);
- ret = asprintf(&subvol_name, "%s_saved", cctx.convert_ops->name);
- if (ret < 0) {
- error("memory allocation failure for subvolume name: %s_saved",
+ snprintf(subvol_name, sizeof(subvol_name), "%s_saved",
cctx.convert_ops->name);
- goto fail;
- }
key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
key.offset = (u64)-1;
key.type = BTRFS_ROOT_ITEM_KEY;
goto fail;
}
ret = create_image(image_root, &mkfs_cfg, &cctx, fd,
- mkfs_cfg.num_bytes, "image", datacsum);
+ mkfs_cfg.num_bytes, "image",
+ convert_flags);
if (ret) {
error("failed to create %s/image: %d", subvol_name, ret);
goto fail;
}
- printf("creating btrfs metadata");
+ printf("creating btrfs metadata\n");
+ ret = pthread_mutex_init(&ctx.mutex, NULL);
+ if (ret) {
+ error("failed to initialize mutex: %d", ret);
+ goto fail;
+ }
ctx.max_copy_inodes = (cctx.inodes_count - cctx.free_inodes_count);
ctx.cur_copy_inodes = 0;
&ctx);
task_start(ctx.info);
}
- ret = copy_inodes(&cctx, root, datacsum, packing, noxattr, &ctx);
+ ret = copy_inodes(&cctx, root, convert_flags, &ctx);
if (ret) {
error("error during copy_inodes %d", ret);
goto fail;
task_deinit(ctx.info);
}
- image_root = link_subvol(root, subvol_name, CONV_IMAGE_SUBVOL_OBJECTID);
+ image_root = btrfs_mksubvol(root, subvol_name,
+ CONV_IMAGE_SUBVOL_OBJECTID, true);
if (!image_root) {
error("unable to link subvolume %s", subvol_name);
goto fail;
}
- free(subvol_name);
-
memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
- if (copylabel == 1) {
+ if (convert_flags & CONVERT_FLAG_COPY_LABEL) {
__strncpy_null(root->fs_info->super_copy->label,
cctx.volume_name, BTRFS_LABEL_SIZE - 1);
printf("copy label '%s'\n", root->fs_info->super_copy->label);
- } else if (copylabel == -1) {
+ } else if (convert_flags & CONVERT_FLAG_SET_LABEL) {
strcpy(root->fs_info->super_copy->label, fslabel);
printf("set label to '%s'\n", fslabel);
}
goto fail;
}
- root = open_ctree_fd(fd, devname, 0,
- OPEN_CTREE_WRITES | OPEN_CTREE_FS_PARTIAL);
- if (!root) {
- error("unable to open ctree for finalization");
- goto fail;
- }
- root->fs_info->finalize_on_close = 1;
- close_ctree(root);
- close(fd);
+ root = open_ctree_fd(fd, devname, 0,
+ OPEN_CTREE_WRITES | OPEN_CTREE_FS_PARTIAL);
+ if (!root) {
+ error("unable to open ctree for finalization");
+ goto fail;
+ }
+ root->fs_info->finalize_on_close = 1;
+ close_ctree(root);
+ close(fd);
+
+ printf("conversion complete\n");
+ return 0;
+fail:
+ clean_convert_context(&cctx);
+ if (fd != -1)
+ close(fd);
+ warning(
+"an error occurred during conversion, filesystem is partially created but not finalized and not mountable");
+ return -1;
+}
+
+/*
+ * Read out data of convert image which is in btrfs reserved ranges so we can
+ * use them to overwrite the ranges during rollback.
+ */
+static int read_reserved_ranges(struct btrfs_root *root, u64 ino,
+ u64 total_bytes, char *reserved_ranges[])
+{
+ int i;
+ int ret = 0;
+
+ for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++) {
+ const struct simple_range *range = &btrfs_reserved_ranges[i];
+
+ if (range->start + range->len >= total_bytes)
+ break;
+ ret = btrfs_read_file(root, ino, range->start, range->len,
+ reserved_ranges[i]);
+ if (ret < range->len) {
+ error(
+ "failed to read data of convert image, offset=%llu len=%llu ret=%d",
+ range->start, range->len, ret);
+ if (ret >= 0)
+ ret = -EIO;
+ break;
+ }
+ ret = 0;
+ }
+ return ret;
+}
+
+static bool is_subset_of_reserved_ranges(u64 start, u64 len)
+{
+ int i;
+ bool ret = false;
+
+ for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++) {
+ const struct simple_range *range = &btrfs_reserved_ranges[i];
+
+ if (start >= range->start && start + len <= range_end(range)) {
+ ret = true;
+ break;
+ }
+ }
+ return ret;
+}
+
+static bool is_chunk_direct_mapped(struct btrfs_fs_info *fs_info, u64 start)
+{
+ struct cache_extent *ce;
+ struct map_lookup *map;
+ bool ret = false;
+
+ ce = search_cache_extent(&fs_info->mapping_tree.cache_tree, start);
+ if (!ce)
+ goto out;
+ if (ce->start > start || ce->start + ce->size < start)
+ goto out;
+
+ map = container_of(ce, struct map_lookup, ce);
- printf("conversion complete");
- return 0;
-fail:
- clean_convert_context(&cctx);
- if (fd != -1)
- close(fd);
- warning(
-"an error occurred during conversion, filesystem is partially created but not finalized and not mountable");
- return -1;
+ /* Not SINGLE chunk */
+ if (map->num_stripes != 1)
+ goto out;
+
+ /* Chunk's logical doesn't match with phisical, not 1:1 mapped */
+ if (map->ce.start != map->stripes[0].physical)
+ goto out;
+ ret = true;
+out:
+ return ret;
}
/*
- * Check if a non 1:1 mapped chunk can be rolled back.
- * For new convert, it's OK while for old convert it's not.
+ * Iterate all file extents of the convert image.
+ *
+ * All file extents except ones in btrfs_reserved_ranges must be mapped 1:1
+ * on disk. (Means thier file_offset must match their on disk bytenr)
+ *
+ * File extents in reserved ranges can be relocated to other place, and in
+ * that case we will read them out for later use.
*/
-static int may_rollback_chunk(struct btrfs_fs_info *fs_info, u64 bytenr)
+static int check_convert_image(struct btrfs_root *image_root, u64 ino,
+ u64 total_size, char *reserved_ranges[])
{
- struct btrfs_block_group_cache *bg;
struct btrfs_key key;
struct btrfs_path path;
- struct btrfs_root *extent_root = fs_info->extent_root;
- u64 bg_start;
- u64 bg_end;
+ struct btrfs_fs_info *fs_info = image_root->fs_info;
+ u64 checked_bytes = 0;
int ret;
- bg = btrfs_lookup_first_block_group(fs_info, bytenr);
- if (!bg)
- return -ENOENT;
- bg_start = bg->key.objectid;
- bg_end = bg->key.objectid + bg->key.offset;
-
- key.objectid = bg_end;
- key.type = BTRFS_METADATA_ITEM_KEY;
+ key.objectid = ino;
key.offset = 0;
- btrfs_init_path(&path);
+ key.type = BTRFS_EXTENT_DATA_KEY;
- ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
- if (ret < 0)
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0);
+ /*
+ * It's possible that some fs doesn't store any (including sb)
+ * data into 0~1M range, and NO_HOLES is enabled.
+ *
+ * So we only need to check if ret < 0
+ */
+ if (ret < 0) {
+ error("failed to iterate file extents at offset 0: %s",
+ strerror(-ret));
+ btrfs_release_path(&path);
return ret;
+ }
+ /* Loop from the first file extents */
while (1) {
- struct btrfs_extent_item *ei;
+ struct btrfs_file_extent_item *fi;
+ struct extent_buffer *leaf = path.nodes[0];
+ u64 disk_bytenr;
+ u64 file_offset;
+ u64 ram_bytes;
+ int slot = path.slots[0];
- ret = btrfs_previous_extent_item(extent_root, &path, bg_start);
- if (ret > 0) {
- ret = 0;
- break;
- }
- if (ret < 0)
- break;
+ if (slot >= btrfs_header_nritems(leaf))
+ goto next;
+ btrfs_item_key_to_cpu(leaf, &key, slot);
- btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
- if (key.type == BTRFS_METADATA_ITEM_KEY)
- continue;
- /* Now it's EXTENT_ITEM_KEY only */
- ei = btrfs_item_ptr(path.nodes[0], path.slots[0],
- struct btrfs_extent_item);
/*
- * Found data extent, means this is old convert must follow 1:1
- * mapping.
+ * Iteration is done, exit normally, we have extra check out of
+ * the loop
*/
- if (btrfs_extent_flags(path.nodes[0], ei)
- & BTRFS_EXTENT_FLAG_DATA) {
+ if (key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY) {
+ ret = 0;
+ break;
+ }
+ file_offset = key.offset;
+ fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) {
ret = -EINVAL;
+ error(
+ "ino %llu offset %llu doesn't have a regular file extent",
+ ino, file_offset);
break;
}
- }
- btrfs_release_path(&path);
- return ret;
-}
-
-static int may_rollback(struct btrfs_root *root)
-{
- struct btrfs_fs_info *info = root->fs_info;
- struct btrfs_multi_bio *multi = NULL;
- u64 bytenr;
- u64 length;
- u64 physical;
- u64 total_bytes;
- int num_stripes;
- int ret;
-
- if (btrfs_super_num_devices(info->super_copy) != 1)
- goto fail;
-
- bytenr = BTRFS_SUPER_INFO_OFFSET;
- total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
-
- while (1) {
- ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
- &length, &multi, 0, NULL);
- if (ret) {
- if (ret == -ENOENT) {
- /* removed block group at the tail */
- if (length == (u64)-1)
- break;
-
- /* removed block group in the middle */
- goto next;
- }
- goto fail;
+ if (btrfs_file_extent_compression(leaf, fi) ||
+ btrfs_file_extent_encryption(leaf, fi) ||
+ btrfs_file_extent_other_encoding(leaf, fi)) {
+ ret = -EINVAL;
+ error(
+ "ino %llu offset %llu doesn't have a plain file extent",
+ ino, file_offset);
+ break;
}
- num_stripes = multi->num_stripes;
- physical = multi->stripes[0].physical;
- free(multi);
+ disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
- if (num_stripes != 1) {
- error("num stripes for bytenr %llu is not 1", bytenr);
- goto fail;
- }
+ checked_bytes += ram_bytes;
+ /* Skip hole */
+ if (disk_bytenr == 0)
+ goto next;
/*
- * Extra check for new convert, as metadata chunk from new
- * convert is much more free than old convert, it doesn't need
- * to do 1:1 mapping.
+ * Most file extents must be 1:1 mapped, which means 2 things:
+ * 1) File extent file offset == disk_bytenr
+ * 2) That data chunk's logical == chunk's physical
+ *
+ * So file extent's file offset == physical position on disk.
+ *
+ * And after rolling back btrfs reserved range, other part
+ * remains what old fs used to be.
*/
- if (physical != bytenr) {
+ if (file_offset != disk_bytenr ||
+ !is_chunk_direct_mapped(fs_info, disk_bytenr)) {
/*
- * Check if it's a metadata chunk and has only metadata
- * extent.
+ * Only file extent in btrfs reserved ranges are
+ * allowed to be non-1:1 mapped
*/
- ret = may_rollback_chunk(info, bytenr);
- if (ret < 0)
- goto fail;
+ if (!is_subset_of_reserved_ranges(file_offset,
+ ram_bytes)) {
+ ret = -EINVAL;
+ error(
+ "ino %llu offset %llu file extent should not be relocated",
+ ino, file_offset);
+ break;
+ }
}
next:
- bytenr += length;
- if (bytenr >= total_bytes)
+ ret = btrfs_next_item(image_root, &path);
+ if (ret) {
+ if (ret > 0)
+ ret = 0;
break;
+ }
}
- return 0;
-fail:
- return -1;
+ btrfs_release_path(&path);
+ if (ret)
+ return ret;
+ /*
+ * For HOLES mode (without NO_HOLES), we must ensure file extents
+ * cover the whole range of the image
+ */
+ if (!ret && !btrfs_fs_incompat(fs_info, NO_HOLES)) {
+ if (checked_bytes != total_size) {
+ ret = -EINVAL;
+ error("inode %llu has some file extents not checked",
+ ino);
+ return ret;
+ }
+ }
+
+ /* So far so good, read old data located in btrfs reserved ranges */
+ ret = read_reserved_ranges(image_root, ino, total_size,
+ reserved_ranges);
+ return ret;
}
+/*
+ * btrfs rollback is just reverted convert:
+ * |<---------------Btrfs fs------------------------------>|
+ * |<- Old data chunk ->|< new chunk (D/M/S)>|<- ODC ->|
+ * |<-Old-FE->| |<-Old-FE->|<- Btrfs extents ->|<-Old-FE->|
+ * ||
+ * \/
+ * |<------------------Old fs----------------------------->|
+ * |<- used ->| |<- used ->| |<- used ->|
+ *
+ * However things are much easier than convert, we don't really need to
+ * do the complex space calculation, but only to handle btrfs reserved space
+ *
+ * |<---------------------------Btrfs fs----------------------------->|
+ * | RSV 1 | | Old | | RSV 2 | | Old | | RSV 3 |
+ * | 0~1M | | Fs | | SB2 + 64K | | Fs | | SB3 + 64K |
+ *
+ * On the other hand, the converted fs image in btrfs is a completely
+ * valid old fs.
+ *
+ * |<-----------------Converted fs image in btrfs-------------------->|
+ * | RSV 1 | | Old | | RSV 2 | | Old | | RSV 3 |
+ * | Relocated | | Fs | | Relocated | | Fs | | Relocated |
+ *
+ * Used space in fs image should be at the same physical position on disk.
+ * We only need to recover the data in reserved ranges, so the whole
+ * old fs is back.
+ *
+ * The idea to rollback is also straightforward, we just "read" out the data
+ * of reserved ranges, and write them back to there they should be.
+ * Then the old fs is back.
+ */
static int do_rollback(const char *devname)
{
- int fd = -1;
- int ret;
- int i;
struct btrfs_root *root;
struct btrfs_root *image_root;
- struct btrfs_root *chunk_root;
- struct btrfs_dir_item *dir;
- struct btrfs_inode_item *inode;
- struct btrfs_file_extent_item *fi;
- struct btrfs_trans_handle *trans;
- struct extent_buffer *leaf;
- struct btrfs_block_group_cache *cache1;
- struct btrfs_block_group_cache *cache2;
+ struct btrfs_fs_info *fs_info;
struct btrfs_key key;
struct btrfs_path path;
- struct extent_io_tree io_tree;
- char *buf = NULL;
- char *name;
- u64 bytenr;
- u64 num_bytes;
- u64 root_dir;
- u64 objectid;
- u64 offset;
- u64 start;
- u64 end;
- u64 sb_bytenr;
- u64 first_free;
+ struct btrfs_dir_item *dir;
+ struct btrfs_inode_item *inode_item;
+ char *image_name = "image";
+ char *reserved_ranges[ARRAY_SIZE(btrfs_reserved_ranges)] = { NULL };
u64 total_bytes;
- u32 sectorsize;
+ u64 fsize;
+ u64 root_dir;
+ u64 ino;
+ int fd = -1;
+ int ret;
+ int i;
- extent_io_tree_init(&io_tree);
+ for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++) {
+ const struct simple_range *range = &btrfs_reserved_ranges[i];
+ reserved_ranges[i] = calloc(1, range->len);
+ if (!reserved_ranges[i]) {
+ ret = -ENOMEM;
+ goto free_mem;
+ }
+ }
fd = open(devname, O_RDWR);
if (fd < 0) {
error("unable to open %s: %s", devname, strerror(errno));
- goto fail;
+ ret = -EIO;
+ goto free_mem;
}
- root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
+ fsize = lseek(fd, 0, SEEK_END);
+
+ /*
+ * For rollback, we don't really need to write anything so open it
+ * read-only. The write part will happen after we close the
+ * filesystem.
+ */
+ root = open_ctree_fd(fd, devname, 0, 0);
if (!root) {
error("unable to open ctree");
- goto fail;
- }
- ret = may_rollback(root);
- if (ret < 0) {
- error("unable to do rollback: %d", ret);
- goto fail;
+ ret = -EIO;
+ goto free_mem;
}
+ fs_info = root->fs_info;
- sectorsize = root->sectorsize;
- buf = malloc(sectorsize);
- if (!buf) {
- error("unable to allocate memory");
- goto fail;
- }
-
- btrfs_init_path(&path);
-
+ /*
+ * Search root backref first, or after subvolume deletion (orphan),
+ * we can still rollback the image.
+ */
key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
key.type = BTRFS_ROOT_BACKREF_KEY;
key.offset = BTRFS_FS_TREE_OBJECTID;
- ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, 0,
- 0);
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, &path, 0, 0);
btrfs_release_path(&path);
if (ret > 0) {
- error("unable to convert ext2 image subvolume, is it deleted?");
- goto fail;
+ error("unable to find source fs image subvolume, is it deleted?");
+ ret = -ENOENT;
+ goto close_fs;
} else if (ret < 0) {
- error("unable to open ext2_saved, id %llu: %s",
- (unsigned long long)key.objectid, strerror(-ret));
- goto fail;
+ error("failed to find source fs image subvolume: %s",
+ strerror(-ret));
+ goto close_fs;
}
+ /* Search convert subvolume */
key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
- image_root = btrfs_read_fs_root(root->fs_info, &key);
- if (!image_root || IS_ERR(image_root)) {
- error("unable to open subvolume %llu: %ld",
- (unsigned long long)key.objectid, PTR_ERR(image_root));
- goto fail;
+ image_root = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(image_root)) {
+ ret = PTR_ERR(image_root);
+ error("failed to open convert image subvolume: %s",
+ strerror(-ret));
+ goto close_fs;
}
- name = "image";
- root_dir = btrfs_root_dirid(&root->root_item);
- dir = btrfs_lookup_dir_item(NULL, image_root, &path,
- root_dir, name, strlen(name), 0);
+ /* Search the image file */
+ root_dir = btrfs_root_dirid(&image_root->root_item);
+ dir = btrfs_lookup_dir_item(NULL, image_root, &path, root_dir,
+ image_name, strlen(image_name), 0);
+
if (!dir || IS_ERR(dir)) {
- error("unable to find file %s: %ld", name, PTR_ERR(dir));
- goto fail;
+ btrfs_release_path(&path);
+ if (dir)
+ ret = PTR_ERR(dir);
+ else
+ ret = -ENOENT;
+ error("failed to locate file %s: %s", image_name,
+ strerror(-ret));
+ goto close_fs;
}
- leaf = path.nodes[0];
- btrfs_dir_item_key_to_cpu(leaf, dir, &key);
+ btrfs_dir_item_key_to_cpu(path.nodes[0], dir, &key);
btrfs_release_path(&path);
- objectid = key.objectid;
+ /* Get total size of the original image */
+ ino = key.objectid;
ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0);
- if (ret) {
- error("unable to find inode item: %d", ret);
- goto fail;
- }
- leaf = path.nodes[0];
- inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
- total_bytes = btrfs_inode_size(leaf, inode);
- btrfs_release_path(&path);
- key.objectid = objectid;
- key.offset = 0;
- key.type = BTRFS_EXTENT_DATA_KEY;
- ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0);
- if (ret != 0) {
- error("unable to find first file extent: %d", ret);
+ if (ret < 0) {
btrfs_release_path(&path);
- goto fail;
- }
-
- /* build mapping tree for the relocated blocks */
- for (offset = 0; offset < total_bytes; ) {
- leaf = path.nodes[0];
- if (path.slots[0] >= btrfs_header_nritems(leaf)) {
- ret = btrfs_next_leaf(root, &path);
- if (ret != 0)
- break;
- continue;
- }
-
- btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
- if (key.objectid != objectid || key.offset != offset ||
- key.type != BTRFS_EXTENT_DATA_KEY)
- break;
-
- fi = btrfs_item_ptr(leaf, path.slots[0],
- struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
- break;
- if (btrfs_file_extent_compression(leaf, fi) ||
- btrfs_file_extent_encryption(leaf, fi) ||
- btrfs_file_extent_other_encoding(leaf, fi))
- break;
-
- bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
- /* skip holes and direct mapped extents */
- if (bytenr == 0 || bytenr == offset)
- goto next_extent;
-
- bytenr += btrfs_file_extent_offset(leaf, fi);
- num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
-
- cache1 = btrfs_lookup_block_group(root->fs_info, offset);
- cache2 = btrfs_lookup_block_group(root->fs_info,
- offset + num_bytes - 1);
- /*
- * Here we must take consideration of old and new convert
- * behavior.
- * For old convert case, sign, there is no consist chunk type
- * that will cover the extent. META/DATA/SYS are all possible.
- * Just ensure relocate one is in SYS chunk.
- * For new convert case, they are all covered by DATA chunk.
- *
- * So, there is not valid chunk type check for it now.
- */
- if (cache1 != cache2)
- break;
-
- set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
- EXTENT_LOCKED, GFP_NOFS);
- set_state_private(&io_tree, offset, bytenr);
-next_extent:
- offset += btrfs_file_extent_num_bytes(leaf, fi);
- path.slots[0]++;
+ error("unable to find inode %llu: %s", ino, strerror(-ret));
+ goto close_fs;
}
+ inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_inode_item);
+ total_bytes = btrfs_inode_size(path.nodes[0], inode_item);
btrfs_release_path(&path);
- if (offset < total_bytes) {
- error("unable to build extent mapping (offset %llu, total_bytes %llu)",
- (unsigned long long)offset,
- (unsigned long long)total_bytes);
- error("converted filesystem after balance is unable to rollback");
- goto fail;
+ /* Check if we can rollback the image */
+ ret = check_convert_image(image_root, ino, total_bytes, reserved_ranges);
+ if (ret < 0) {
+ error("old fs image can't be rolled back");
+ goto close_fs;
}
+close_fs:
+ btrfs_release_path(&path);
+ close_ctree_fs_info(fs_info);
+ if (ret)
+ goto free_mem;
- first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
- first_free &= ~((u64)sectorsize - 1);
- /* backup for extent #0 should exist */
- if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
- error("no backup for the first extent");
- goto fail;
- }
- /* force no allocation from system block group */
- root->fs_info->system_allocs = -1;
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- error("unable to start transaction");
- goto fail;
- }
/*
- * recow the whole chunk tree, this will remove all chunk tree blocks
- * from system block group
+ * Everything is OK, just write back old fs data into btrfs reserved
+ * ranges
+ *
+ * Here, we starts from the backup blocks first, so if something goes
+ * wrong, the fs is still mountable
*/
- chunk_root = root->fs_info->chunk_root;
- memset(&key, 0, sizeof(key));
- while (1) {
- ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
- if (ret < 0)
- break;
-
- ret = btrfs_next_leaf(chunk_root, &path);
- if (ret)
- break;
-
- btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
- btrfs_release_path(&path);
- }
- btrfs_release_path(&path);
-
- offset = 0;
- num_bytes = 0;
- while(1) {
- cache1 = btrfs_lookup_block_group(root->fs_info, offset);
- if (!cache1)
- break;
-
- if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
- num_bytes += btrfs_block_group_used(&cache1->item);
-
- offset = cache1->key.objectid + cache1->key.offset;
- }
- /* only extent #0 left in system block group? */
- if (num_bytes > first_free) {
- error(
- "unable to empty system block group (num_bytes %llu, first_free %llu",
- (unsigned long long)num_bytes,
- (unsigned long long)first_free);
- goto fail;
- }
- /* create a system chunk that maps the whole device */
- ret = prepare_system_chunk_sb(root->fs_info->super_copy);
- if (ret) {
- error("unable to update system chunk: %d", ret);
- goto fail;
- }
-
- ret = btrfs_commit_transaction(trans, root);
- if (ret) {
- error("transaction commit failed: %d", ret);
- goto fail;
- }
-
- ret = close_ctree(root);
- if (ret) {
- error("close_ctree failed: %d", ret);
- goto fail;
- }
-
- /* zero btrfs super block mirrors */
- memset(buf, 0, sectorsize);
- for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr >= total_bytes)
- break;
- ret = pwrite(fd, buf, sectorsize, bytenr);
- if (ret != sectorsize) {
- error("zeroing superblock mirror %d failed: %d",
- i, ret);
- goto fail;
- }
- }
- sb_bytenr = (u64)-1;
- /* copy all relocated blocks back */
- while(1) {
- ret = find_first_extent_bit(&io_tree, 0, &start, &end,
- EXTENT_LOCKED);
- if (ret)
- break;
-
- ret = get_state_private(&io_tree, start, &bytenr);
- BUG_ON(ret);
+ for (i = ARRAY_SIZE(btrfs_reserved_ranges) - 1; i >= 0; i--) {
+ u64 real_size;
+ const struct simple_range *range = &btrfs_reserved_ranges[i];
- clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
- GFP_NOFS);
+ if (range_end(range) >= fsize)
+ continue;
- while (start <= end) {
- if (start == BTRFS_SUPER_INFO_OFFSET) {
- sb_bytenr = bytenr;
- goto next_sector;
- }
- ret = pread(fd, buf, sectorsize, bytenr);
- if (ret < 0) {
- error("reading superblock at %llu failed: %d",
- (unsigned long long)bytenr, ret);
- goto fail;
- }
- BUG_ON(ret != sectorsize);
- ret = pwrite(fd, buf, sectorsize, start);
- if (ret < 0) {
- error("writing superblock at %llu failed: %d",
- (unsigned long long)start, ret);
- goto fail;
- }
- BUG_ON(ret != sectorsize);
-next_sector:
- start += sectorsize;
- bytenr += sectorsize;
+ real_size = min(range_end(range), fsize) - range->start;
+ ret = pwrite(fd, reserved_ranges[i], real_size, range->start);
+ if (ret < real_size) {
+ if (ret < 0)
+ ret = -errno;
+ else
+ ret = -EIO;
+ error("failed to recover range [%llu, %llu): %s",
+ range->start, real_size, strerror(-ret));
+ goto free_mem;
}
+ ret = 0;
}
- ret = fsync(fd);
- if (ret < 0) {
- error("fsync failed: %s", strerror(errno));
- goto fail;
- }
- /*
- * finally, overwrite btrfs super block.
- */
- ret = pread(fd, buf, sectorsize, sb_bytenr);
- if (ret < 0) {
- error("reading primary superblock failed: %s",
- strerror(errno));
- goto fail;
- }
- BUG_ON(ret != sectorsize);
- ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
- if (ret < 0) {
- error("writing primary superblock failed: %s",
- strerror(errno));
- goto fail;
- }
- BUG_ON(ret != sectorsize);
- ret = fsync(fd);
- if (ret < 0) {
- error("fsync failed: %s", strerror(errno));
- goto fail;
- }
-
- close(fd);
- free(buf);
- extent_io_tree_cleanup(&io_tree);
- printf("rollback complete\n");
- return 0;
-
-fail:
- if (fd != -1)
- close(fd);
- free(buf);
- error("rollback aborted");
- return -1;
+free_mem:
+ for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++)
+ free(reserved_ranges[i]);
+ if (ret)
+ error("rollback failed");
+ else
+ printf("rollback succeeded\n");
+ return ret;
}
static void print_usage(void)
printf("\n");
printf("Supported filesystems:\n");
printf("\text2/3/4: %s\n", BTRFSCONVERT_EXT2 ? "yes" : "no");
+ printf("\treiserfs: %s\n", BTRFSCONVERT_REISERFS ? "yes" : "no");
}
int main(int argc, char *argv[])
rollback = 1;
break;
case 'l':
- copylabel = -1;
+ copylabel = CONVERT_FLAG_SET_LABEL;
if (strlen(optarg) >= BTRFS_LABEL_SIZE) {
warning(
"label too long, trimmed to %d bytes",
__strncpy_null(fslabel, optarg, BTRFS_LABEL_SIZE - 1);
break;
case 'L':
- copylabel = 1;
+ copylabel = CONVERT_FLAG_COPY_LABEL;
break;
case 'p':
progress = 1;
if (rollback) {
ret = do_rollback(file);
} else {
- ret = do_convert(file, datacsum, packing, noxattr, nodesize,
- copylabel, fslabel, progress, features);
+ u32 cf = 0;
+
+ cf |= datacsum ? CONVERT_FLAG_DATACSUM : 0;
+ cf |= packing ? CONVERT_FLAG_INLINE_DATA : 0;
+ cf |= noxattr ? 0 : CONVERT_FLAG_XATTR;
+ cf |= copylabel;
+ ret = do_convert(file, cf, nodesize, fslabel, progress, features);
}
if (ret)
return 1;
projects / platform / upstream / btrfs-progs.git / blobdiff