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Btrfs: Fix for insert_inline_extent to handle offset != 0

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This modifies inline extent size calculation, so that
insert_inline_extent can handle the case that parameter 'offset' is
not zero; it also a few codes to zero uninitialized area in inline
extent.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan 2007-10-25 15:42:57 -04:00 committed by Chris Mason
parent cc0c553847
commit 18f16f7ba6
1 changed files with 12 additions and 9 deletions
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21
fs/btrfs/file.c
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@ -108,7 +108,6 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
key.objectid = inode->i_ino; key.objectid = inode->i_ino;
key.offset = offset; key.offset = offset;
btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
datasize = btrfs_file_extent_calc_inline_size(offset + size);
ret = btrfs_search_slot(trans, root, &key, path, 0, 1); ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) { if (ret < 0) {
@ -130,7 +129,7 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
} }
if (ret == 0) { if (ret == 0) {
u32 found_size; u32 found_size;
u64 found_start; u64 found_end;
leaf = path->nodes[0]; leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0], ei = btrfs_item_ptr(leaf, path->slots[0],
@ -144,19 +143,17 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
offset, inode->i_ino); offset, inode->i_ino);
goto fail; goto fail;
} }
found_start = key.offset;
found_size = btrfs_file_extent_inline_len(leaf, found_size = btrfs_file_extent_inline_len(leaf,
btrfs_item_nr(leaf, path->slots[0])); btrfs_item_nr(leaf, path->slots[0]));
found_end = key.offset + found_size;
if (found_size < offset + size) { if (found_end < offset + size) {
btrfs_release_path(root, path); btrfs_release_path(root, path);
ret = btrfs_search_slot(trans, root, &key, path, ret = btrfs_search_slot(trans, root, &key, path,
offset + size - found_size - offset + size - found_end, 1);
found_start, 1);
BUG_ON(ret != 0); BUG_ON(ret != 0);
ret = btrfs_extend_item(trans, root, path, ret = btrfs_extend_item(trans, root, path,
offset + size - found_size - offset + size - found_end);
found_start);
if (ret) { if (ret) {
err = ret; err = ret;
goto fail; goto fail;
@ -165,9 +162,15 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
ei = btrfs_item_ptr(leaf, path->slots[0], ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item); struct btrfs_file_extent_item);
} }
if (found_end < offset) {
ptr = btrfs_file_extent_inline_start(ei) + found_size;
memset_extent_buffer(leaf, 0, ptr, offset - found_end);
}
} else { } else {
insert: insert:
btrfs_release_path(root, path); btrfs_release_path(root, path);
datasize = offset + size - key.offset;
datasize = btrfs_file_extent_calc_inline_size(datasize);
ret = btrfs_insert_empty_item(trans, root, path, &key, ret = btrfs_insert_empty_item(trans, root, path, &key,
datasize); datasize);
if (ret) { if (ret) {
@ -181,7 +184,7 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
btrfs_set_file_extent_generation(leaf, ei, trans->transid); btrfs_set_file_extent_generation(leaf, ei, trans->transid);
btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
} }
ptr = btrfs_file_extent_inline_start(ei) + offset; ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset;
cur_size = size; cur_size = size;
i = 0; i = 0;