btrfs_truncate

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-03-27 11:05:53 -04:00 committed by David Woodhouse
parent 71951f35a6
commit f4b9aa8d3b
2 changed files with 114 additions and 18 deletions

View File

@ -171,20 +171,21 @@ static int pin_down_block(struct btrfs_root *root, u64 blocknr, int pending)
struct btrfs_header *header;
struct buffer_head *bh;
bh = sb_find_get_block(root->fs_info->sb, blocknr);
if (bh) {
header = btrfs_buffer_header(bh);
if (btrfs_header_generation(header) ==
root->fs_info->running_transaction->transid) {
if (!pending) {
bh = sb_find_get_block(root->fs_info->sb, blocknr);
if (bh) {
header = btrfs_buffer_header(bh);
if (btrfs_header_generation(header) ==
root->fs_info->running_transaction->transid) {
brelse(bh);
return 0;
}
brelse(bh);
return 0;
}
brelse(bh);
}
if (pending)
err = set_radix_bit(&root->fs_info->pending_del_radix, blocknr);
else
err = set_radix_bit(&root->fs_info->pinned_radix, blocknr);
} else {
err = set_radix_bit(&root->fs_info->pending_del_radix, blocknr);
}
BUG_ON(err);
return 0;
}
@ -223,6 +224,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
BUG_ON(ei->refs == 0);
refs = btrfs_extent_refs(ei) - 1;
btrfs_set_extent_refs(ei, refs);
mark_buffer_dirty(path.nodes[0]);
if (refs == 0) {
u64 super_blocks_used;
@ -240,7 +242,6 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
if (ret)
BUG();
}
mark_buffer_dirty(path.nodes[0]);
btrfs_release_path(extent_root, &path);
finish_current_insert(trans, extent_root);
return ret;

View File

@ -28,11 +28,15 @@ static void btrfs_read_locked_inode(struct inode *inode)
struct btrfs_inode_item *inode_item;
struct btrfs_root *root = btrfs_sb(inode->i_sb);
int ret;
btrfs_init_path(&path);
mutex_lock(&root->fs_info->fs_mutex);
ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
if (ret) {
make_bad_inode(inode);
btrfs_release_path(root, &path);
mutex_unlock(&root->fs_info->fs_mutex);
make_bad_inode(inode);
return;
}
inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
@ -53,6 +57,7 @@ static void btrfs_read_locked_inode(struct inode *inode)
inode->i_blocks = btrfs_inode_nblocks(inode_item);
inode->i_generation = btrfs_inode_generation(inode_item);
btrfs_release_path(root, &path);
mutex_unlock(&root->fs_info->fs_mutex);
switch (inode->i_mode & S_IFMT) {
#if 0
default:
@ -151,20 +156,85 @@ error:
return ret;
}
static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode)
{
int ret;
struct btrfs_path path;
struct btrfs_key key;
struct btrfs_disk_key *found_key;
struct btrfs_leaf *leaf;
struct btrfs_file_extent_item *fi;
u64 extent_start;
u64 extent_num_blocks;
/* FIXME, add redo link to tree so we don't leak on crash */
key.objectid = inode->i_ino;
key.offset = (u64)-1;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
while(1) {
btrfs_init_path(&path);
ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
if (ret < 0) {
btrfs_release_path(root, &path);
goto error;
}
if (ret > 0) {
BUG_ON(path.slots[0] == 0);
path.slots[0]--;
}
leaf = btrfs_buffer_leaf(path.nodes[0]);
found_key = &leaf->items[path.slots[0]].key;
if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
break;
if (btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
break;
if (btrfs_disk_key_offset(found_key) < inode->i_size)
break;
/* FIXME: add extent truncation */
if (btrfs_disk_key_offset(found_key) < inode->i_size)
break;
fi = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
path.slots[0],
struct btrfs_file_extent_item);
extent_start = btrfs_file_extent_disk_blocknr(fi);
extent_num_blocks = btrfs_file_extent_disk_num_blocks(fi);
key.offset = btrfs_disk_key_offset(found_key) - 1;
ret = btrfs_del_item(trans, root, &path);
BUG_ON(ret);
inode->i_blocks -= btrfs_file_extent_num_blocks(fi) >> 9;
btrfs_release_path(root, &path);
ret = btrfs_free_extent(trans, root, extent_start,
extent_num_blocks, 0);
BUG_ON(ret);
if (btrfs_disk_key_offset(found_key) == 0)
break;
}
btrfs_release_path(root, &path);
ret = 0;
error:
return ret;
}
static void btrfs_delete_inode(struct inode *inode)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = btrfs_sb(inode->i_sb);
int ret;
truncate_inode_pages(&inode->i_data, 0);
if (is_bad_inode(inode)) {
goto no_delete;
}
inode->i_size = 0;
if (inode->i_blocks)
WARN_ON(1);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
if (S_ISREG(inode->i_mode)) {
ret = btrfs_truncate_in_trans(trans, root, inode);
BUG_ON(ret);
}
btrfs_free_inode(trans, root, inode);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
@ -173,7 +243,6 @@ no_delete:
clear_inode(inode);
}
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
ino_t *ino)
{
@ -688,6 +757,8 @@ allocate:
err = ret;
goto out;
}
inode->i_blocks += inode->i_sb->s_blocksize >> 9;
set_buffer_new(result);
map_bh(result, inode->i_sb, blocknr);
out:
@ -724,6 +795,30 @@ static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
return nobh_writepage(page, btrfs_get_block, wbc);
}
static void btrfs_truncate(struct inode *inode)
{
struct btrfs_root *root = btrfs_sb(inode->i_sb);
int ret;
struct btrfs_trans_handle *trans;
if (!S_ISREG(inode->i_mode))
return;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
return;
nobh_truncate_page(inode->i_mapping, inode->i_size);
/* FIXME, add redo link to tree so we don't leak on crash */
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_truncate_in_trans(trans, root, inode);
BUG_ON(ret);
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
mark_inode_dirty(inode);
}
static int btrfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
@ -772,7 +867,7 @@ static struct address_space_operations btrfs_aops = {
};
static struct inode_operations btrfs_file_inode_operations = {
.truncate = NULL,
.truncate = btrfs_truncate,
};
static struct file_operations btrfs_file_operations = {