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-rw-r--r--fs/btrfs/ioctl.c733
1 files changed, 0 insertions, 733 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 04899d3d775e..f8a73a28022a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -87,10 +87,6 @@ struct btrfs_ioctl_send_args_32 {
struct btrfs_ioctl_send_args_32)
#endif
-static int btrfs_clone(struct inode *src, struct inode *inode,
- u64 off, u64 olen, u64 olen_aligned, u64 destoff,
- int no_time_update);
-
/* Mask out flags that are inappropriate for the given type of inode. */
static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
unsigned int flags)
@@ -3315,735 +3311,6 @@ out:
return ret;
}
-static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
- struct inode *inode2, u64 loff2, u64 len)
-{
- unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
- unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
-}
-
-static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
- struct inode *inode2, u64 loff2, u64 len)
-{
- if (inode1 < inode2) {
- swap(inode1, inode2);
- swap(loff1, loff2);
- } else if (inode1 == inode2 && loff2 < loff1) {
- swap(loff1, loff2);
- }
- lock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
- lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
-}
-
-static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 len,
- struct inode *dst, u64 dst_loff)
-{
- const u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
- int ret;
-
- /*
- * Lock destination range to serialize with concurrent readpages() and
- * source range to serialize with relocation.
- */
- btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
- ret = btrfs_clone(src, dst, loff, len, ALIGN(len, bs), dst_loff, 1);
- btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
-
- return ret;
-}
-
-#define BTRFS_MAX_DEDUPE_LEN SZ_16M
-
-static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
- struct inode *dst, u64 dst_loff)
-{
- int ret;
- u64 i, tail_len, chunk_count;
- struct btrfs_root *root_dst = BTRFS_I(dst)->root;
-
- spin_lock(&root_dst->root_item_lock);
- if (root_dst->send_in_progress) {
- btrfs_warn_rl(root_dst->fs_info,
-"cannot deduplicate to root %llu while send operations are using it (%d in progress)",
- root_dst->root_key.objectid,
- root_dst->send_in_progress);
- spin_unlock(&root_dst->root_item_lock);
- return -EAGAIN;
- }
- root_dst->dedupe_in_progress++;
- spin_unlock(&root_dst->root_item_lock);
-
- tail_len = olen % BTRFS_MAX_DEDUPE_LEN;
- chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN);
-
- for (i = 0; i < chunk_count; i++) {
- ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
- dst, dst_loff);
- if (ret)
- goto out;
-
- loff += BTRFS_MAX_DEDUPE_LEN;
- dst_loff += BTRFS_MAX_DEDUPE_LEN;
- }
-
- if (tail_len > 0)
- ret = btrfs_extent_same_range(src, loff, tail_len, dst,
- dst_loff);
-out:
- spin_lock(&root_dst->root_item_lock);
- root_dst->dedupe_in_progress--;
- spin_unlock(&root_dst->root_item_lock);
-
- return ret;
-}
-
-static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
- struct inode *inode,
- u64 endoff,
- const u64 destoff,
- const u64 olen,
- int no_time_update)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
-
- inode_inc_iversion(inode);
- if (!no_time_update)
- inode->i_mtime = inode->i_ctime = current_time(inode);
- /*
- * We round up to the block size at eof when determining which
- * extents to clone above, but shouldn't round up the file size.
- */
- if (endoff > destoff + olen)
- endoff = destoff + olen;
- if (endoff > inode->i_size) {
- i_size_write(inode, endoff);
- btrfs_inode_safe_disk_i_size_write(inode, 0);
- }
-
- ret = btrfs_update_inode(trans, root, inode);
- if (ret) {
- btrfs_abort_transaction(trans, ret);
- btrfs_end_transaction(trans);
- goto out;
- }
- ret = btrfs_end_transaction(trans);
-out:
- return ret;
-}
-
-/*
- * Make sure we do not end up inserting an inline extent into a file that has
- * already other (non-inline) extents. If a file has an inline extent it can
- * not have any other extents and the (single) inline extent must start at the
- * file offset 0. Failing to respect these rules will lead to file corruption,
- * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
- *
- * We can have extents that have been already written to disk or we can have
- * dirty ranges still in delalloc, in which case the extent maps and items are
- * created only when we run delalloc, and the delalloc ranges might fall outside
- * the range we are currently locking in the inode's io tree. So we check the
- * inode's i_size because of that (i_size updates are done while holding the
- * i_mutex, which we are holding here).
- * We also check to see if the inode has a size not greater than "datal" but has
- * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
- * protected against such concurrent fallocate calls by the i_mutex).
- *
- * If the file has no extents but a size greater than datal, do not allow the
- * copy because we would need turn the inline extent into a non-inline one (even
- * with NO_HOLES enabled). If we find our destination inode only has one inline
- * extent, just overwrite it with the source inline extent if its size is less
- * than the source extent's size, or we could copy the source inline extent's
- * data into the destination inode's inline extent if the later is greater then
- * the former.
- */
-static int clone_copy_inline_extent(struct inode *dst,
- struct btrfs_trans_handle *trans,
- struct btrfs_path *path,
- struct btrfs_key *new_key,
- const u64 drop_start,
- const u64 datal,
- const u64 skip,
- const u64 size,
- char *inline_data)
-{
- struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb);
- struct btrfs_root *root = BTRFS_I(dst)->root;
- const u64 aligned_end = ALIGN(new_key->offset + datal,
- fs_info->sectorsize);
- int ret;
- struct btrfs_key key;
-
- if (new_key->offset > 0)
- return -EOPNOTSUPP;
-
- key.objectid = btrfs_ino(BTRFS_I(dst));
- key.type = BTRFS_EXTENT_DATA_KEY;
- key.offset = 0;
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0) {
- return ret;
- } else if (ret > 0) {
- if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
- ret = btrfs_next_leaf(root, path);
- if (ret < 0)
- return ret;
- else if (ret > 0)
- goto copy_inline_extent;
- }
- btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
- if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
- key.type == BTRFS_EXTENT_DATA_KEY) {
- ASSERT(key.offset > 0);
- return -EOPNOTSUPP;
- }
- } else if (i_size_read(dst) <= datal) {
- struct btrfs_file_extent_item *ei;
- u64 ext_len;
-
- /*
- * If the file size is <= datal, make sure there are no other
- * extents following (can happen do to an fallocate call with
- * the flag FALLOC_FL_KEEP_SIZE).
- */
- ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
- struct btrfs_file_extent_item);
- /*
- * If it's an inline extent, it can not have other extents
- * following it.
- */
- if (btrfs_file_extent_type(path->nodes[0], ei) ==
- BTRFS_FILE_EXTENT_INLINE)
- goto copy_inline_extent;
-
- ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
- if (ext_len > aligned_end)
- return -EOPNOTSUPP;
-
- ret = btrfs_next_item(root, path);
- if (ret < 0) {
- return ret;
- } else if (ret == 0) {
- btrfs_item_key_to_cpu(path->nodes[0], &key,
- path->slots[0]);
- if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
- key.type == BTRFS_EXTENT_DATA_KEY)
- return -EOPNOTSUPP;
- }
- }
-
-copy_inline_extent:
- /*
- * We have no extent items, or we have an extent at offset 0 which may
- * or may not be inlined. All these cases are dealt the same way.
- */
- if (i_size_read(dst) > datal) {
- /*
- * If the destination inode has an inline extent...
- * This would require copying the data from the source inline
- * extent into the beginning of the destination's inline extent.
- * But this is really complex, both extents can be compressed
- * or just one of them, which would require decompressing and
- * re-compressing data (which could increase the new compressed
- * size, not allowing the compressed data to fit anymore in an
- * inline extent).
- * So just don't support this case for now (it should be rare,
- * we are not really saving space when cloning inline extents).
- */
- return -EOPNOTSUPP;
- }
-
- btrfs_release_path(path);
- ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
- if (ret)
- return ret;
- ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
- if (ret)
- return ret;
-
- if (skip) {
- const u32 start = btrfs_file_extent_calc_inline_size(0);
-
- memmove(inline_data + start, inline_data + start + skip, datal);
- }
-
- write_extent_buffer(path->nodes[0], inline_data,
- btrfs_item_ptr_offset(path->nodes[0],
- path->slots[0]),
- size);
- inode_add_bytes(dst, datal);
- set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(dst)->runtime_flags);
-
- return 0;
-}
-
-/**
- * btrfs_clone() - clone a range from inode file to another
- *
- * @src: Inode to clone from
- * @inode: Inode to clone to
- * @off: Offset within source to start clone from
- * @olen: Original length, passed by user, of range to clone
- * @olen_aligned: Block-aligned value of olen
- * @destoff: Offset within @inode to start clone
- * @no_time_update: Whether to update mtime/ctime on the target inode
- */
-static int btrfs_clone(struct inode *src, struct inode *inode,
- const u64 off, const u64 olen, const u64 olen_aligned,
- const u64 destoff, int no_time_update)
-{
- struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_path *path = NULL;
- struct extent_buffer *leaf;
- struct btrfs_trans_handle *trans;
- char *buf = NULL;
- struct btrfs_key key;
- u32 nritems;
- int slot;
- int ret;
- const u64 len = olen_aligned;
- u64 last_dest_end = destoff;
-
- ret = -ENOMEM;
- buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
- if (!buf)
- return ret;
-
- path = btrfs_alloc_path();
- if (!path) {
- kvfree(buf);
- return ret;
- }
-
- path->reada = READA_FORWARD;
- /* clone data */
- key.objectid = btrfs_ino(BTRFS_I(src));
- key.type = BTRFS_EXTENT_DATA_KEY;
- key.offset = off;
-
- while (1) {
- u64 next_key_min_offset = key.offset + 1;
- struct btrfs_file_extent_item *extent;
- int type;
- u32 size;
- struct btrfs_key new_key;
- u64 disko = 0, diskl = 0;
- u64 datao = 0, datal = 0;
- u8 comp;
- u64 drop_start;
-
- /*
- * note the key will change type as we walk through the
- * tree.
- */
- path->leave_spinning = 1;
- ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
- 0, 0);
- if (ret < 0)
- goto out;
- /*
- * First search, if no extent item that starts at offset off was
- * found but the previous item is an extent item, it's possible
- * it might overlap our target range, therefore process it.
- */
- if (key.offset == off && ret > 0 && path->slots[0] > 0) {
- btrfs_item_key_to_cpu(path->nodes[0], &key,
- path->slots[0] - 1);
- if (key.type == BTRFS_EXTENT_DATA_KEY)
- path->slots[0]--;
- }
-
- nritems = btrfs_header_nritems(path->nodes[0]);
-process_slot:
- if (path->slots[0] >= nritems) {
- ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
- if (ret < 0)
- goto out;
- if (ret > 0)
- break;
- nritems = btrfs_header_nritems(path->nodes[0]);
- }
- leaf = path->nodes[0];
- slot = path->slots[0];
-
- btrfs_item_key_to_cpu(leaf, &key, slot);
- if (key.type > BTRFS_EXTENT_DATA_KEY ||
- key.objectid != btrfs_ino(BTRFS_I(src)))
- break;
-
- ASSERT(key.type == BTRFS_EXTENT_DATA_KEY);
-
- extent = btrfs_item_ptr(leaf, slot,
- struct btrfs_file_extent_item);
- comp = btrfs_file_extent_compression(leaf, extent);
- type = btrfs_file_extent_type(leaf, extent);
- if (type == BTRFS_FILE_EXTENT_REG ||
- type == BTRFS_FILE_EXTENT_PREALLOC) {
- disko = btrfs_file_extent_disk_bytenr(leaf, extent);
- diskl = btrfs_file_extent_disk_num_bytes(leaf, extent);
- datao = btrfs_file_extent_offset(leaf, extent);
- datal = btrfs_file_extent_num_bytes(leaf, extent);
- } else if (type == BTRFS_FILE_EXTENT_INLINE) {
- /* Take upper bound, may be compressed */
- datal = btrfs_file_extent_ram_bytes(leaf, extent);
- }
-
- /*
- * The first search might have left us at an extent item that
- * ends before our target range's start, can happen if we have
- * holes and NO_HOLES feature enabled.
- */
- if (key.offset + datal <= off) {
- path->slots[0]++;
- goto process_slot;
- } else if (key.offset >= off + len) {
- break;
- }
- next_key_min_offset = key.offset + datal;
- size = btrfs_item_size_nr(leaf, slot);
- read_extent_buffer(leaf, buf, btrfs_item_ptr_offset(leaf, slot),
- size);
-
- btrfs_release_path(path);
- path->leave_spinning = 0;
-
- memcpy(&new_key, &key, sizeof(new_key));
- new_key.objectid = btrfs_ino(BTRFS_I(inode));
- if (off <= key.offset)
- new_key.offset = key.offset + destoff - off;
- else
- new_key.offset = destoff;
-
- /*
- * Deal with a hole that doesn't have an extent item that
- * represents it (NO_HOLES feature enabled).
- * This hole is either in the middle of the cloning range or at
- * the beginning (fully overlaps it or partially overlaps it).
- */
- if (new_key.offset != last_dest_end)
- drop_start = last_dest_end;
- else
- drop_start = new_key.offset;
-
- if (type == BTRFS_FILE_EXTENT_REG ||
- type == BTRFS_FILE_EXTENT_PREALLOC) {
- struct btrfs_clone_extent_info clone_info;
-
- /*
- * a | --- range to clone ---| b
- * | ------------- extent ------------- |
- */
-
- /* Subtract range b */
- if (key.offset + datal > off + len)
- datal = off + len - key.offset;
-
- /* Subtract range a */
- if (off > key.offset) {
- datao += off - key.offset;
- datal -= off - key.offset;
- }
-
- clone_info.disk_offset = disko;
- clone_info.disk_len = diskl;
- clone_info.data_offset = datao;
- clone_info.data_len = datal;
- clone_info.file_offset = new_key.offset;
- clone_info.extent_buf = buf;
- clone_info.item_size = size;
- ret = btrfs_punch_hole_range(inode, path,
- drop_start,
- new_key.offset + datal - 1,
- &clone_info, &trans);
- if (ret)
- goto out;
- } else if (type == BTRFS_FILE_EXTENT_INLINE) {
- u64 skip = 0;
- u64 trim = 0;
-
- if (off > key.offset) {
- skip = off - key.offset;
- new_key.offset += skip;
- }
-
- if (key.offset + datal > off + len)
- trim = key.offset + datal - (off + len);
-
- if (comp && (skip || trim)) {
- ret = -EINVAL;
- goto out;
- }
- size -= skip + trim;
- datal -= skip + trim;
-
- /*
- * If our extent is inline, we know we will drop or
- * adjust at most 1 extent item in the destination root.
- *
- * 1 - adjusting old extent (we may have to split it)
- * 1 - add new extent
- * 1 - inode update
- */
- trans = btrfs_start_transaction(root, 3);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- goto out;
- }
-
- ret = clone_copy_inline_extent(inode, trans, path,
- &new_key, drop_start,
- datal, skip, size, buf);
- if (ret) {
- if (ret != -EOPNOTSUPP)
- btrfs_abort_transaction(trans, ret);
- btrfs_end_transaction(trans);
- goto out;
- }
- }
-
- btrfs_release_path(path);
-
- last_dest_end = ALIGN(new_key.offset + datal,
- fs_info->sectorsize);
- ret = clone_finish_inode_update(trans, inode, last_dest_end,
- destoff, olen, no_time_update);
- if (ret)
- goto out;
- if (new_key.offset + datal >= destoff + len)
- break;
-
- btrfs_release_path(path);
- key.offset = next_key_min_offset;
-
- if (fatal_signal_pending(current)) {
- ret = -EINTR;
- goto out;
- }
- }
- ret = 0;
-
- if (last_dest_end < destoff + len) {
- /*
- * We have an implicit hole that fully or partially overlaps our
- * cloning range at its end. This means that we either have the
- * NO_HOLES feature enabled or the implicit hole happened due to
- * mixing buffered and direct IO writes against this file.
- */
- btrfs_release_path(path);
- path->leave_spinning = 0;
-
- ret = btrfs_punch_hole_range(inode, path,
- last_dest_end, destoff + len - 1,
- NULL, &trans);
- if (ret)
- goto out;
-
- ret = clone_finish_inode_update(trans, inode, destoff + len,
- destoff, olen, no_time_update);
- }
-
-out:
- btrfs_free_path(path);
- kvfree(buf);
- return ret;
-}
-
-static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
- u64 off, u64 olen, u64 destoff)
-{
- struct inode *inode = file_inode(file);
- struct inode *src = file_inode(file_src);
- struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
- int ret;
- u64 len = olen;
- u64 bs = fs_info->sb->s_blocksize;
-
- /*
- * TODO:
- * - split compressed inline extents. annoying: we need to
- * decompress into destination's address_space (the file offset
- * may change, so source mapping won't do), then recompress (or
- * otherwise reinsert) a subrange.
- *
- * - split destination inode's inline extents. The inline extents can
- * be either compressed or non-compressed.
- */
-
- /*
- * VFS's generic_remap_file_range_prep() protects us from cloning the
- * eof block into the middle of a file, which would result in corruption
- * if the file size is not blocksize aligned. So we don't need to check
- * for that case here.
- */
- if (off + len == src->i_size)
- len = ALIGN(src->i_size, bs) - off;
-
- if (destoff > inode->i_size) {
- const u64 wb_start = ALIGN_DOWN(inode->i_size, bs);
-
- ret = btrfs_cont_expand(inode, inode->i_size, destoff);
- if (ret)
- return ret;
- /*
- * We may have truncated the last block if the inode's size is
- * not sector size aligned, so we need to wait for writeback to
- * complete before proceeding further, otherwise we can race
- * with cloning and attempt to increment a reference to an
- * extent that no longer exists (writeback completed right after
- * we found the previous extent covering eof and before we
- * attempted to increment its reference count).
- */
- ret = btrfs_wait_ordered_range(inode, wb_start,
- destoff - wb_start);
- if (ret)
- return ret;
- }
-
- /*
- * Lock destination range to serialize with concurrent readpages() and
- * source range to serialize with relocation.
- */
- btrfs_double_extent_lock(src, off, inode, destoff, len);
- ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
- btrfs_double_extent_unlock(src, off, inode, destoff, len);
- /*
- * Truncate page cache pages so that future reads will see the cloned
- * data immediately and not the previous data.
- */
- truncate_inode_pages_range(&inode->i_data,
- round_down(destoff, PAGE_SIZE),
- round_up(destoff + len, PAGE_SIZE) - 1);
-
- return ret;
-}
-
-static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
- struct file *file_out, loff_t pos_out,
- loff_t *len, unsigned int remap_flags)
-{
- struct inode *inode_in = file_inode(file_in);
- struct inode *inode_out = file_inode(file_out);
- u64 bs = BTRFS_I(inode_out)->root->fs_info->sb->s_blocksize;
- bool same_inode = inode_out == inode_in;
- u64 wb_len;
- int ret;
-
- if (!(remap_flags & REMAP_FILE_DEDUP)) {
- struct btrfs_root *root_out = BTRFS_I(inode_out)->root;
-
- if (btrfs_root_readonly(root_out))
- return -EROFS;
-
- if (file_in->f_path.mnt != file_out->f_path.mnt ||
- inode_in->i_sb != inode_out->i_sb)
- return -EXDEV;
- }
-
- /* don't make the dst file partly checksummed */
- if ((BTRFS_I(inode_in)->flags & BTRFS_INODE_NODATASUM) !=
- (BTRFS_I(inode_out)->flags & BTRFS_INODE_NODATASUM)) {
- return -EINVAL;
- }
-
- /*
- * Now that the inodes are locked, we need to start writeback ourselves
- * and can not rely on the writeback from the VFS's generic helper
- * generic_remap_file_range_prep() because:
- *
- * 1) For compression we must call filemap_fdatawrite_range() range
- * twice (btrfs_fdatawrite_range() does it for us), and the generic
- * helper only calls it once;
- *
- * 2) filemap_fdatawrite_range(), called by the generic helper only
- * waits for the writeback to complete, i.e. for IO to be done, and
- * not for the ordered extents to complete. We need to wait for them
- * to complete so that new file extent items are in the fs tree.
- */
- if (*len == 0 && !(remap_flags & REMAP_FILE_DEDUP))
- wb_len = ALIGN(inode_in->i_size, bs) - ALIGN_DOWN(pos_in, bs);
- else
- wb_len = ALIGN(*len, bs);
-
- /*
- * Since we don't lock ranges, wait for ongoing lockless dio writes (as
- * any in progress could create its ordered extents after we wait for
- * existing ordered extents below).
- */
- inode_dio_wait(inode_in);
- if (!same_inode)
- inode_dio_wait(inode_out);
-
- /*
- * Workaround to make sure NOCOW buffered write reach disk as NOCOW.
- *
- * Btrfs' back references do not have a block level granularity, they
- * work at the whole extent level.
- * NOCOW buffered write without data space reserved may not be able
- * to fall back to CoW due to lack of data space, thus could cause
- * data loss.
- *
- * Here we take a shortcut by flushing the whole inode, so that all
- * nocow write should reach disk as nocow before we increase the
- * reference of the extent. We could do better by only flushing NOCOW
- * data, but that needs extra accounting.
- *
- * Also we don't need to check ASYNC_EXTENT, as async extent will be
- * CoWed anyway, not affecting nocow part.
- */
- ret = filemap_flush(inode_in->i_mapping);
- if (ret < 0)
- return ret;
-
- ret = btrfs_wait_ordered_range(inode_in, ALIGN_DOWN(pos_in, bs),
- wb_len);
- if (ret < 0)
- return ret;
- ret = btrfs_wait_ordered_range(inode_out, ALIGN_DOWN(pos_out, bs),
- wb_len);
- if (ret < 0)
- return ret;
-
- return generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
- len, remap_flags);
-}
-
-loff_t btrfs_remap_file_range(struct file *src_file, loff_t off,
- struct file *dst_file, loff_t destoff, loff_t len,
- unsigned int remap_flags)
-{
- struct inode *src_inode = file_inode(src_file);
- struct inode *dst_inode = file_inode(dst_file);
- bool same_inode = dst_inode == src_inode;
- int ret;
-
- if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
- return -EINVAL;
-
- if (same_inode)
- inode_lock(src_inode);
- else
- lock_two_nondirectories(src_inode, dst_inode);
-
- ret = btrfs_remap_file_range_prep(src_file, off, dst_file, destoff,
- &len, remap_flags);
- if (ret < 0 || len == 0)
- goto out_unlock;
-
- if (remap_flags & REMAP_FILE_DEDUP)
- ret = btrfs_extent_same(src_inode, off, len, dst_inode, destoff);
- else
- ret = btrfs_clone_files(dst_file, src_file, off, len, destoff);
-
-out_unlock:
- if (same_inode)
- inode_unlock(src_inode);
- else
- unlock_two_nondirectories(src_inode, dst_inode);
-
- return ret < 0 ? ret : len;
-}
-
static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
{
struct inode *inode = file_inode(file);