Mountable btrfs, with readdir
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Родитель
2e635a2783
Коммит
e20d96d64f
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@ -2,7 +2,8 @@ ifneq ($(KERNELRELEASE),)
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# kbuild part of makefile
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obj-m := btrfs.o
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btrfs-y := super.o
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btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
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hash.o file-item.o inode-item.o inode-map.o disk-io.o
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#btrfs-y := ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
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# root-tree.o dir-item.o hash.o file-item.o inode-item.o \
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@ -14,7 +15,7 @@ else
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KERNELDIR := /lib/modules/`uname -r`/build
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all::
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$(MAKE) -C $(KERNELDIR) M=`pwd` modules
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$(MAKE) C=1 -C $(KERNELDIR) M=`pwd` modules
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clean::
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rm *.o btrfs.ko
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endif
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273
fs/btrfs/ctree.c
273
fs/btrfs/ctree.c
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@ -7,11 +7,11 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
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static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_path *path, int data_size);
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static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_buffer *dst, struct btrfs_buffer
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*root, struct buffer_head *dst, struct buffer_head
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*src);
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static int balance_node_right(struct btrfs_trans_handle *trans, struct
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btrfs_root *root, struct btrfs_buffer *dst_buf,
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struct btrfs_buffer *src_buf);
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btrfs_root *root, struct buffer_head *dst_buf,
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struct buffer_head *src_buf);
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static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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struct btrfs_path *path, int level, int slot);
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@ -32,32 +32,34 @@ void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p)
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}
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static int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_buffer *buf, struct btrfs_buffer
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*parent, int parent_slot, struct btrfs_buffer
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*root, struct buffer_head *buf, struct buffer_head
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*parent, int parent_slot, struct buffer_head
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**cow_ret)
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{
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struct btrfs_buffer *cow;
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struct buffer_head *cow;
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struct btrfs_node *cow_node;
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if (!list_empty(&buf->dirty)) {
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if (!buffer_dirty(buf)) {
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*cow_ret = buf;
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return 0;
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}
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cow = btrfs_alloc_free_block(trans, root);
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memcpy(&cow->node, &buf->node, root->blocksize);
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btrfs_set_header_blocknr(&cow->node.header, cow->blocknr);
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cow_node = btrfs_buffer_node(cow);
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memcpy(cow_node, btrfs_buffer_node(buf), root->blocksize);
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btrfs_set_header_blocknr(&cow_node->header, cow->b_blocknr);
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*cow_ret = cow;
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btrfs_inc_ref(trans, root, buf);
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if (buf == root->node) {
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root->node = cow;
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cow->count++;
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get_bh(cow);
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if (buf != root->commit_root)
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btrfs_free_extent(trans, root, buf->blocknr, 1, 1);
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btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1);
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btrfs_block_release(root, buf);
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} else {
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btrfs_set_node_blockptr(&parent->node, parent_slot,
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cow->blocknr);
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BUG_ON(list_empty(&parent->dirty));
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btrfs_free_extent(trans, root, buf->blocknr, 1, 1);
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btrfs_set_node_blockptr(btrfs_buffer_node(parent), parent_slot,
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cow->b_blocknr);
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BUG_ON(!buffer_dirty(parent));
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btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1);
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}
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btrfs_block_release(root, buf);
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return 0;
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@ -119,12 +121,12 @@ static int check_node(struct btrfs_root *root, struct btrfs_path *path,
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{
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int i;
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struct btrfs_node *parent = NULL;
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struct btrfs_node *node = &path->nodes[level]->node;
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struct btrfs_node *node = btrfs_buffer_node(path->nodes[level]);
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int parent_slot;
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u32 nritems = btrfs_header_nritems(&node->header);
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if (path->nodes[level + 1])
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parent = &path->nodes[level + 1]->node;
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parent = btrfs_buffer_node(path->nodes[level + 1]);
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parent_slot = path->slots[level + 1];
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BUG_ON(nritems == 0);
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if (parent) {
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@ -148,13 +150,13 @@ static int check_leaf(struct btrfs_root *root, struct btrfs_path *path,
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int level)
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{
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int i;
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struct btrfs_leaf *leaf = &path->nodes[level]->leaf;
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struct btrfs_leaf *leaf = btrfs_buffer_leaf(path->nodes[level]);
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struct btrfs_node *parent = NULL;
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int parent_slot;
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u32 nritems = btrfs_header_nritems(&leaf->header);
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if (path->nodes[level + 1])
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parent = &path->nodes[level + 1]->node;
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parent = btrfs_buffer_node(path->nodes[level + 1]);
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parent_slot = path->slots[level + 1];
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BUG_ON(btrfs_leaf_free_space(root, leaf) < 0);
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@ -250,11 +252,11 @@ static int bin_search(struct btrfs_node *c, struct btrfs_key *key, int *slot)
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return -1;
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}
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static struct btrfs_buffer *read_node_slot(struct btrfs_root *root,
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struct btrfs_buffer *parent_buf,
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static struct buffer_head *read_node_slot(struct btrfs_root *root,
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struct buffer_head *parent_buf,
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int slot)
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{
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struct btrfs_node *node = &parent_buf->node;
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struct btrfs_node *node = btrfs_buffer_node(parent_buf);
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if (slot < 0)
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return NULL;
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if (slot >= btrfs_header_nritems(&node->header))
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@ -265,10 +267,10 @@ static struct btrfs_buffer *read_node_slot(struct btrfs_root *root,
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static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_path *path, int level)
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{
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struct btrfs_buffer *right_buf;
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struct btrfs_buffer *mid_buf;
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struct btrfs_buffer *left_buf;
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struct btrfs_buffer *parent_buf = NULL;
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struct buffer_head *right_buf;
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struct buffer_head *mid_buf;
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struct buffer_head *left_buf;
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struct buffer_head *parent_buf = NULL;
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struct btrfs_node *right = NULL;
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struct btrfs_node *mid;
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struct btrfs_node *left = NULL;
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@ -283,7 +285,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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return 0;
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mid_buf = path->nodes[level];
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mid = &mid_buf->node;
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mid = btrfs_buffer_node(mid_buf);
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orig_ptr = btrfs_node_blockptr(mid, orig_slot);
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if (level < BTRFS_MAX_LEVEL - 1)
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@ -295,8 +297,8 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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* by promoting the node below to a root
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*/
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if (!parent_buf) {
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struct btrfs_buffer *child;
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u64 blocknr = mid_buf->blocknr;
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struct buffer_head *child;
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u64 blocknr = mid_buf->b_blocknr;
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if (btrfs_header_nritems(&mid->header) != 1)
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return 0;
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@ -313,7 +315,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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clean_tree_block(trans, root, mid_buf);
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return btrfs_free_extent(trans, root, blocknr, 1, 1);
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}
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parent = &parent_buf->node;
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parent = btrfs_buffer_node(parent_buf);
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if (btrfs_header_nritems(&mid->header) >
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BTRFS_NODEPTRS_PER_BLOCK(root) / 4)
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@ -326,7 +328,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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if (left_buf) {
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btrfs_cow_block(trans, root, left_buf, parent_buf, pslot - 1,
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&left_buf);
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left = &left_buf->node;
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left = btrfs_buffer_node(left_buf);
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orig_slot += btrfs_header_nritems(&left->header);
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wret = push_node_left(trans, root, left_buf, mid_buf);
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if (wret < 0)
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@ -339,12 +341,12 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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if (right_buf) {
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btrfs_cow_block(trans, root, right_buf, parent_buf, pslot + 1,
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&right_buf);
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right = &right_buf->node;
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right = btrfs_buffer_node(right_buf);
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wret = push_node_left(trans, root, mid_buf, right_buf);
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if (wret < 0)
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ret = wret;
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if (btrfs_header_nritems(&right->header) == 0) {
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u64 blocknr = right_buf->blocknr;
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u64 blocknr = right_buf->b_blocknr;
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btrfs_block_release(root, right_buf);
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clean_tree_block(trans, root, right_buf);
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right_buf = NULL;
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@ -360,7 +362,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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memcpy(&parent->ptrs[pslot + 1].key,
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&right->ptrs[0].key,
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sizeof(struct btrfs_disk_key));
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BUG_ON(list_empty(&parent_buf->dirty));
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BUG_ON(!buffer_dirty(parent_buf));
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}
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}
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if (btrfs_header_nritems(&mid->header) == 1) {
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@ -381,7 +383,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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}
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if (btrfs_header_nritems(&mid->header) == 0) {
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/* we've managed to empty the middle node, drop it */
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u64 blocknr = mid_buf->blocknr;
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u64 blocknr = mid_buf->b_blocknr;
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btrfs_block_release(root, mid_buf);
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clean_tree_block(trans, root, mid_buf);
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mid_buf = NULL;
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@ -396,13 +398,13 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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/* update the parent key to reflect our changes */
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memcpy(&parent->ptrs[pslot].key, &mid->ptrs[0].key,
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sizeof(struct btrfs_disk_key));
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BUG_ON(list_empty(&parent_buf->dirty));
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BUG_ON(!buffer_dirty(parent_buf));
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}
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/* update the path */
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if (left_buf) {
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if (btrfs_header_nritems(&left->header) > orig_slot) {
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left_buf->count++; // released below
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get_bh(left_buf);
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path->nodes[level] = left_buf;
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path->slots[level + 1] -= 1;
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path->slots[level] = orig_slot;
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@ -415,8 +417,9 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
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}
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/* double check we haven't messed things up */
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check_block(root, path, level);
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if (orig_ptr != btrfs_node_blockptr(&path->nodes[level]->node,
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path->slots[level]))
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if (orig_ptr !=
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btrfs_node_blockptr(btrfs_buffer_node(path->nodes[level]),
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path->slots[level]))
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BUG();
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if (right_buf)
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@ -443,8 +446,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_key *key, struct btrfs_path *p, int
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ins_len, int cow)
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{
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struct btrfs_buffer *b;
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struct btrfs_buffer *cow_buf;
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struct buffer_head *b;
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struct buffer_head *cow_buf;
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struct btrfs_node *c;
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int slot;
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int ret;
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@ -452,18 +455,20 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
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again:
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b = root->node;
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b->count++;
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get_bh(b);
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while (b) {
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level = btrfs_header_level(&b->node.header);
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c = btrfs_buffer_node(b);
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level = btrfs_header_level(&c->header);
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if (cow) {
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int wret;
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wret = btrfs_cow_block(trans, root, b, p->nodes[level +
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1], p->slots[level + 1],
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wret = btrfs_cow_block(trans, root, b,
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p->nodes[level + 1],
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p->slots[level + 1],
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&cow_buf);
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b = cow_buf;
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}
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BUG_ON(!cow && ins_len);
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c = &b->node;
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c = btrfs_buffer_node(b);
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p->nodes[level] = b;
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ret = check_block(root, p, level);
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if (ret)
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@ -480,7 +485,7 @@ again:
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if (sret)
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return sret;
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b = p->nodes[level];
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c = &b->node;
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c = btrfs_buffer_node(b);
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slot = p->slots[level];
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} else if (ins_len < 0) {
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int sret = balance_level(trans, root, p,
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@ -490,7 +495,7 @@ again:
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b = p->nodes[level];
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if (!b)
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goto again;
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c = &b->node;
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c = btrfs_buffer_node(b);
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slot = p->slots[level];
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BUG_ON(btrfs_header_nritems(&c->header) == 1);
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}
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@ -505,11 +510,9 @@ again:
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if (sret)
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return sret;
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}
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BUG_ON(root->node->count == 1);
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return ret;
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}
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}
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BUG_ON(root->node->count == 1);
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return 1;
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}
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@ -534,9 +537,9 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans, struct btrfs_root
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int tslot = path->slots[i];
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if (!path->nodes[i])
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break;
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t = &path->nodes[i]->node;
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t = btrfs_buffer_node(path->nodes[i]);
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memcpy(&t->ptrs[tslot].key, key, sizeof(*key));
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BUG_ON(list_empty(&path->nodes[i]->dirty));
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BUG_ON(!buffer_dirty(path->nodes[i]));
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if (tslot != 0)
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break;
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}
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@ -551,11 +554,11 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans, struct btrfs_root
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* error, and > 0 if there was no room in the left hand block.
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*/
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static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_buffer *dst_buf, struct
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btrfs_buffer *src_buf)
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*root, struct buffer_head *dst_buf, struct
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buffer_head *src_buf)
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{
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struct btrfs_node *src = &src_buf->node;
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struct btrfs_node *dst = &dst_buf->node;
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struct btrfs_node *src = btrfs_buffer_node(src_buf);
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struct btrfs_node *dst = btrfs_buffer_node(dst_buf);
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int push_items = 0;
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int src_nritems;
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int dst_nritems;
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|
@ -580,8 +583,8 @@ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
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}
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btrfs_set_header_nritems(&src->header, src_nritems - push_items);
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btrfs_set_header_nritems(&dst->header, dst_nritems + push_items);
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BUG_ON(list_empty(&src_buf->dirty));
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BUG_ON(list_empty(&dst_buf->dirty));
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BUG_ON(!buffer_dirty(src_buf));
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BUG_ON(!buffer_dirty(dst_buf));
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return ret;
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}
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|
@ -595,11 +598,11 @@ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
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* this will only push up to 1/2 the contents of the left node over
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*/
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static int balance_node_right(struct btrfs_trans_handle *trans, struct
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btrfs_root *root, struct btrfs_buffer *dst_buf,
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struct btrfs_buffer *src_buf)
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btrfs_root *root, struct buffer_head *dst_buf,
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struct buffer_head *src_buf)
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{
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struct btrfs_node *src = &src_buf->node;
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struct btrfs_node *dst = &dst_buf->node;
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struct btrfs_node *src = btrfs_buffer_node(src_buf);
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struct btrfs_node *dst = btrfs_buffer_node(dst_buf);
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int push_items = 0;
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int max_push;
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int src_nritems;
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|
@ -628,8 +631,8 @@ static int balance_node_right(struct btrfs_trans_handle *trans, struct
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btrfs_set_header_nritems(&src->header, src_nritems - push_items);
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btrfs_set_header_nritems(&dst->header, dst_nritems + push_items);
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BUG_ON(list_empty(&src_buf->dirty));
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BUG_ON(list_empty(&dst_buf->dirty));
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BUG_ON(!buffer_dirty(src_buf));
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BUG_ON(!buffer_dirty(dst_buf));
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return ret;
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}
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|
@ -643,7 +646,7 @@ static int balance_node_right(struct btrfs_trans_handle *trans, struct
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static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_path *path, int level)
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{
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struct btrfs_buffer *t;
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struct buffer_head *t;
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struct btrfs_node *lower;
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struct btrfs_node *c;
|
||||
struct btrfs_disk_key *lower_key;
|
||||
|
@ -652,24 +655,24 @@ static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
BUG_ON(path->nodes[level-1] != root->node);
|
||||
|
||||
t = btrfs_alloc_free_block(trans, root);
|
||||
c = &t->node;
|
||||
c = btrfs_buffer_node(t);
|
||||
memset(c, 0, root->blocksize);
|
||||
btrfs_set_header_nritems(&c->header, 1);
|
||||
btrfs_set_header_level(&c->header, level);
|
||||
btrfs_set_header_blocknr(&c->header, t->blocknr);
|
||||
btrfs_set_header_blocknr(&c->header, t->b_blocknr);
|
||||
btrfs_set_header_parentid(&c->header,
|
||||
btrfs_header_parentid(&root->node->node.header));
|
||||
lower = &path->nodes[level-1]->node;
|
||||
btrfs_header_parentid(btrfs_buffer_header(root->node)));
|
||||
lower = btrfs_buffer_node(path->nodes[level-1]);
|
||||
if (btrfs_is_leaf(lower))
|
||||
lower_key = &((struct btrfs_leaf *)lower)->items[0].key;
|
||||
else
|
||||
lower_key = &lower->ptrs[0].key;
|
||||
memcpy(&c->ptrs[0].key, lower_key, sizeof(struct btrfs_disk_key));
|
||||
btrfs_set_node_blockptr(c, 0, path->nodes[level - 1]->blocknr);
|
||||
btrfs_set_node_blockptr(c, 0, path->nodes[level - 1]->b_blocknr);
|
||||
/* the super has an extra ref to root->node */
|
||||
btrfs_block_release(root, root->node);
|
||||
root->node = t;
|
||||
t->count++;
|
||||
get_bh(t);
|
||||
path->nodes[level] = t;
|
||||
path->slots[level] = 0;
|
||||
return 0;
|
||||
|
@ -692,7 +695,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
int nritems;
|
||||
|
||||
BUG_ON(!path->nodes[level]);
|
||||
lower = &path->nodes[level]->node;
|
||||
lower = btrfs_buffer_node(path->nodes[level]);
|
||||
nritems = btrfs_header_nritems(&lower->header);
|
||||
if (slot > nritems)
|
||||
BUG();
|
||||
|
@ -705,7 +708,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
memcpy(&lower->ptrs[slot].key, key, sizeof(struct btrfs_disk_key));
|
||||
btrfs_set_node_blockptr(lower, slot, blocknr);
|
||||
btrfs_set_header_nritems(&lower->header, nritems + 1);
|
||||
BUG_ON(list_empty(&path->nodes[level]->dirty));
|
||||
BUG_ON(!buffer_dirty(path->nodes[level]));
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -721,9 +724,9 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_path *path, int level)
|
||||
{
|
||||
struct btrfs_buffer *t;
|
||||
struct buffer_head *t;
|
||||
struct btrfs_node *c;
|
||||
struct btrfs_buffer *split_buffer;
|
||||
struct buffer_head *split_buffer;
|
||||
struct btrfs_node *split;
|
||||
int mid;
|
||||
int ret;
|
||||
|
@ -731,7 +734,7 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
u32 c_nritems;
|
||||
|
||||
t = path->nodes[level];
|
||||
c = &t->node;
|
||||
c = btrfs_buffer_node(t);
|
||||
if (t == root->node) {
|
||||
/* trying to split the root, lets make a new one */
|
||||
ret = insert_new_root(trans, root, path, level + 1);
|
||||
|
@ -740,11 +743,11 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
}
|
||||
c_nritems = btrfs_header_nritems(&c->header);
|
||||
split_buffer = btrfs_alloc_free_block(trans, root);
|
||||
split = &split_buffer->node;
|
||||
split = btrfs_buffer_node(split_buffer);
|
||||
btrfs_set_header_flags(&split->header, btrfs_header_flags(&c->header));
|
||||
btrfs_set_header_blocknr(&split->header, split_buffer->blocknr);
|
||||
btrfs_set_header_blocknr(&split->header, split_buffer->b_blocknr);
|
||||
btrfs_set_header_parentid(&split->header,
|
||||
btrfs_header_parentid(&root->node->node.header));
|
||||
btrfs_header_parentid(btrfs_buffer_header(root->node)));
|
||||
mid = (c_nritems + 1) / 2;
|
||||
memcpy(split->ptrs, c->ptrs + mid,
|
||||
(c_nritems - mid) * sizeof(struct btrfs_key_ptr));
|
||||
|
@ -752,9 +755,9 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
btrfs_set_header_nritems(&c->header, mid);
|
||||
ret = 0;
|
||||
|
||||
BUG_ON(list_empty(&t->dirty));
|
||||
BUG_ON(!buffer_dirty(t));
|
||||
wret = insert_ptr(trans, root, path, &split->ptrs[0].key,
|
||||
split_buffer->blocknr, path->slots[level + 1] + 1,
|
||||
split_buffer->b_blocknr, path->slots[level + 1] + 1,
|
||||
level + 1);
|
||||
if (wret)
|
||||
ret = wret;
|
||||
|
@ -798,11 +801,12 @@ static int leaf_space_used(struct btrfs_leaf *l, int start, int nr)
|
|||
static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_path *path, int data_size)
|
||||
{
|
||||
struct btrfs_buffer *left_buf = path->nodes[0];
|
||||
struct btrfs_leaf *left = &left_buf->leaf;
|
||||
struct buffer_head *left_buf = path->nodes[0];
|
||||
struct btrfs_leaf *left = btrfs_buffer_leaf(left_buf);
|
||||
struct btrfs_leaf *right;
|
||||
struct btrfs_buffer *right_buf;
|
||||
struct btrfs_buffer *upper;
|
||||
struct buffer_head *right_buf;
|
||||
struct buffer_head *upper;
|
||||
struct btrfs_node *upper_node;
|
||||
int slot;
|
||||
int i;
|
||||
int free_space;
|
||||
|
@ -817,12 +821,13 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
return 1;
|
||||
}
|
||||
upper = path->nodes[1];
|
||||
if (slot >= btrfs_header_nritems(&upper->node.header) - 1) {
|
||||
upper_node = btrfs_buffer_node(upper);
|
||||
if (slot >= btrfs_header_nritems(&upper_node->header) - 1) {
|
||||
return 1;
|
||||
}
|
||||
right_buf = read_tree_block(root, btrfs_node_blockptr(&upper->node,
|
||||
slot + 1));
|
||||
right = &right_buf->leaf;
|
||||
right_buf = read_tree_block(root,
|
||||
btrfs_node_blockptr(btrfs_buffer_node(upper), slot + 1));
|
||||
right = btrfs_buffer_leaf(right_buf);
|
||||
free_space = btrfs_leaf_free_space(root, right);
|
||||
if (free_space < data_size + sizeof(struct btrfs_item)) {
|
||||
btrfs_block_release(root, right_buf);
|
||||
|
@ -830,7 +835,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
}
|
||||
/* cow and double check */
|
||||
btrfs_cow_block(trans, root, right_buf, upper, slot + 1, &right_buf);
|
||||
right = &right_buf->leaf;
|
||||
right = btrfs_buffer_leaf(right_buf);
|
||||
free_space = btrfs_leaf_free_space(root, right);
|
||||
if (free_space < data_size + sizeof(struct btrfs_item)) {
|
||||
btrfs_block_release(root, right_buf);
|
||||
|
@ -881,11 +886,11 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
left_nritems -= push_items;
|
||||
btrfs_set_header_nritems(&left->header, left_nritems);
|
||||
|
||||
BUG_ON(list_empty(&left_buf->dirty));
|
||||
BUG_ON(list_empty(&right_buf->dirty));
|
||||
memcpy(&upper->node.ptrs[slot + 1].key,
|
||||
BUG_ON(!buffer_dirty(left_buf));
|
||||
BUG_ON(!buffer_dirty(right_buf));
|
||||
memcpy(&upper_node->ptrs[slot + 1].key,
|
||||
&right->items[0].key, sizeof(struct btrfs_disk_key));
|
||||
BUG_ON(list_empty(&upper->dirty));
|
||||
BUG_ON(!buffer_dirty(upper));
|
||||
|
||||
/* then fixup the leaf pointer in the path */
|
||||
if (path->slots[0] >= left_nritems) {
|
||||
|
@ -905,9 +910,9 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_path *path, int data_size)
|
||||
{
|
||||
struct btrfs_buffer *right_buf = path->nodes[0];
|
||||
struct btrfs_leaf *right = &right_buf->leaf;
|
||||
struct btrfs_buffer *t;
|
||||
struct buffer_head *right_buf = path->nodes[0];
|
||||
struct btrfs_leaf *right = btrfs_buffer_leaf(right_buf);
|
||||
struct buffer_head *t;
|
||||
struct btrfs_leaf *left;
|
||||
int slot;
|
||||
int i;
|
||||
|
@ -926,9 +931,9 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
if (!path->nodes[1]) {
|
||||
return 1;
|
||||
}
|
||||
t = read_tree_block(root, btrfs_node_blockptr(&path->nodes[1]->node,
|
||||
slot - 1));
|
||||
left = &t->leaf;
|
||||
t = read_tree_block(root,
|
||||
btrfs_node_blockptr(btrfs_buffer_node(path->nodes[1]), slot - 1));
|
||||
left = btrfs_buffer_leaf(t);
|
||||
free_space = btrfs_leaf_free_space(root, left);
|
||||
if (free_space < data_size + sizeof(struct btrfs_item)) {
|
||||
btrfs_block_release(root, t);
|
||||
|
@ -937,7 +942,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
|
||||
/* cow and double check */
|
||||
btrfs_cow_block(trans, root, t, path->nodes[1], slot - 1, &t);
|
||||
left = &t->leaf;
|
||||
left = btrfs_buffer_leaf(t);
|
||||
free_space = btrfs_leaf_free_space(root, left);
|
||||
if (free_space < data_size + sizeof(struct btrfs_item)) {
|
||||
btrfs_block_release(root, t);
|
||||
|
@ -999,8 +1004,8 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
push_space = btrfs_item_offset(right->items + i);
|
||||
}
|
||||
|
||||
BUG_ON(list_empty(&t->dirty));
|
||||
BUG_ON(list_empty(&right_buf->dirty));
|
||||
BUG_ON(!buffer_dirty(t));
|
||||
BUG_ON(!buffer_dirty(right_buf));
|
||||
|
||||
wret = fixup_low_keys(trans, root, path, &right->items[0].key, 1);
|
||||
if (wret)
|
||||
|
@ -1029,13 +1034,13 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_path *path, int data_size)
|
||||
{
|
||||
struct btrfs_buffer *l_buf;
|
||||
struct buffer_head *l_buf;
|
||||
struct btrfs_leaf *l;
|
||||
u32 nritems;
|
||||
int mid;
|
||||
int slot;
|
||||
struct btrfs_leaf *right;
|
||||
struct btrfs_buffer *right_buffer;
|
||||
struct buffer_head *right_buffer;
|
||||
int space_needed = data_size + sizeof(struct btrfs_item);
|
||||
int data_copy_size;
|
||||
int rt_data_off;
|
||||
|
@ -1053,7 +1058,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
return wret;
|
||||
}
|
||||
l_buf = path->nodes[0];
|
||||
l = &l_buf->leaf;
|
||||
l = btrfs_buffer_leaf(l_buf);
|
||||
|
||||
/* did the pushes work? */
|
||||
if (btrfs_leaf_free_space(root, l) >=
|
||||
|
@ -1071,7 +1076,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
right_buffer = btrfs_alloc_free_block(trans, root);
|
||||
BUG_ON(!right_buffer);
|
||||
BUG_ON(mid == nritems);
|
||||
right = &right_buffer->leaf;
|
||||
right = btrfs_buffer_leaf(right_buffer);
|
||||
memset(&right->header, 0, sizeof(right->header));
|
||||
if (mid <= slot) {
|
||||
/* FIXME, just alloc a new leaf here */
|
||||
|
@ -1085,10 +1090,10 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
BUG();
|
||||
}
|
||||
btrfs_set_header_nritems(&right->header, nritems - mid);
|
||||
btrfs_set_header_blocknr(&right->header, right_buffer->blocknr);
|
||||
btrfs_set_header_blocknr(&right->header, right_buffer->b_blocknr);
|
||||
btrfs_set_header_level(&right->header, 0);
|
||||
btrfs_set_header_parentid(&right->header,
|
||||
btrfs_header_parentid(&root->node->node.header));
|
||||
btrfs_header_parentid(btrfs_buffer_header(root->node)));
|
||||
data_copy_size = btrfs_item_end(l->items + mid) -
|
||||
leaf_data_end(root, l);
|
||||
memcpy(right->items, l->items + mid,
|
||||
|
@ -1107,11 +1112,11 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
btrfs_set_header_nritems(&l->header, mid);
|
||||
ret = 0;
|
||||
wret = insert_ptr(trans, root, path, &right->items[0].key,
|
||||
right_buffer->blocknr, path->slots[1] + 1, 1);
|
||||
right_buffer->b_blocknr, path->slots[1] + 1, 1);
|
||||
if (wret)
|
||||
ret = wret;
|
||||
BUG_ON(list_empty(&right_buffer->dirty));
|
||||
BUG_ON(list_empty(&l_buf->dirty));
|
||||
BUG_ON(!buffer_dirty(right_buffer));
|
||||
BUG_ON(!buffer_dirty(l_buf));
|
||||
BUG_ON(path->slots[0] != slot);
|
||||
if (mid <= slot) {
|
||||
btrfs_block_release(root, path->nodes[0]);
|
||||
|
@ -1136,7 +1141,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
int slot;
|
||||
int slot_orig;
|
||||
struct btrfs_leaf *leaf;
|
||||
struct btrfs_buffer *leaf_buf;
|
||||
struct buffer_head *leaf_buf;
|
||||
u32 nritems;
|
||||
unsigned int data_end;
|
||||
struct btrfs_disk_key disk_key;
|
||||
|
@ -1156,7 +1161,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
|
||||
slot_orig = path->slots[0];
|
||||
leaf_buf = path->nodes[0];
|
||||
leaf = &leaf_buf->leaf;
|
||||
leaf = btrfs_buffer_leaf(leaf_buf);
|
||||
|
||||
nritems = btrfs_header_nritems(&leaf->header);
|
||||
data_end = leaf_data_end(root, leaf);
|
||||
|
@ -1202,7 +1207,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
if (slot == 0)
|
||||
ret = fixup_low_keys(trans, root, path, &disk_key, 1);
|
||||
|
||||
BUG_ON(list_empty(&leaf_buf->dirty));
|
||||
BUG_ON(!buffer_dirty(leaf_buf));
|
||||
if (btrfs_leaf_free_space(root, leaf) < 0)
|
||||
BUG();
|
||||
check_leaf(root, path, 0);
|
||||
|
@ -1225,7 +1230,8 @@ int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
btrfs_init_path(&path);
|
||||
ret = btrfs_insert_empty_item(trans, root, &path, cpu_key, data_size);
|
||||
if (!ret) {
|
||||
ptr = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], u8);
|
||||
ptr = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
|
||||
path.slots[0], u8);
|
||||
memcpy(ptr, data, data_size);
|
||||
}
|
||||
btrfs_release_path(root, &path);
|
||||
|
@ -1243,12 +1249,12 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
struct btrfs_path *path, int level, int slot)
|
||||
{
|
||||
struct btrfs_node *node;
|
||||
struct btrfs_buffer *parent = path->nodes[level];
|
||||
struct buffer_head *parent = path->nodes[level];
|
||||
u32 nritems;
|
||||
int ret = 0;
|
||||
int wret;
|
||||
|
||||
node = &parent->node;
|
||||
node = btrfs_buffer_node(parent);
|
||||
nritems = btrfs_header_nritems(&node->header);
|
||||
if (slot != nritems -1) {
|
||||
memmove(node->ptrs + slot, node->ptrs + slot + 1,
|
||||
|
@ -1257,16 +1263,17 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
nritems--;
|
||||
btrfs_set_header_nritems(&node->header, nritems);
|
||||
if (nritems == 0 && parent == root->node) {
|
||||
BUG_ON(btrfs_header_level(&root->node->node.header) != 1);
|
||||
struct btrfs_header *header = btrfs_buffer_header(root->node);
|
||||
BUG_ON(btrfs_header_level(header) != 1);
|
||||
/* just turn the root into a leaf and break */
|
||||
btrfs_set_header_level(&root->node->node.header, 0);
|
||||
btrfs_set_header_level(header, 0);
|
||||
} else if (slot == 0) {
|
||||
wret = fixup_low_keys(trans, root, path, &node->ptrs[0].key,
|
||||
level + 1);
|
||||
if (wret)
|
||||
ret = wret;
|
||||
}
|
||||
BUG_ON(list_empty(&parent->dirty));
|
||||
BUG_ON(!buffer_dirty(parent));
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
@ -1279,7 +1286,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
{
|
||||
int slot;
|
||||
struct btrfs_leaf *leaf;
|
||||
struct btrfs_buffer *leaf_buf;
|
||||
struct buffer_head *leaf_buf;
|
||||
int doff;
|
||||
int dsize;
|
||||
int ret = 0;
|
||||
|
@ -1287,7 +1294,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
u32 nritems;
|
||||
|
||||
leaf_buf = path->nodes[0];
|
||||
leaf = &leaf_buf->leaf;
|
||||
leaf = btrfs_buffer_leaf(leaf_buf);
|
||||
slot = path->slots[0];
|
||||
doff = btrfs_item_offset(leaf->items + slot);
|
||||
dsize = btrfs_item_size(leaf->items + slot);
|
||||
|
@ -1313,14 +1320,13 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
if (nritems == 0) {
|
||||
if (leaf_buf == root->node) {
|
||||
btrfs_set_header_level(&leaf->header, 0);
|
||||
BUG_ON(list_empty(&leaf_buf->dirty));
|
||||
} else {
|
||||
clean_tree_block(trans, root, leaf_buf);
|
||||
wret = del_ptr(trans, root, path, 1, path->slots[1]);
|
||||
if (wret)
|
||||
ret = wret;
|
||||
wret = btrfs_free_extent(trans, root,
|
||||
leaf_buf->blocknr, 1, 1);
|
||||
leaf_buf->b_blocknr, 1, 1);
|
||||
if (wret)
|
||||
ret = wret;
|
||||
}
|
||||
|
@ -1332,7 +1338,6 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
if (wret)
|
||||
ret = wret;
|
||||
}
|
||||
BUG_ON(list_empty(&leaf_buf->dirty));
|
||||
|
||||
/* delete the leaf if it is mostly empty */
|
||||
if (used < BTRFS_LEAF_DATA_SIZE(root) / 3) {
|
||||
|
@ -1341,7 +1346,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
* for possible call to del_ptr below
|
||||
*/
|
||||
slot = path->slots[1];
|
||||
leaf_buf->count++;
|
||||
get_bh(leaf_buf);
|
||||
wret = push_leaf_left(trans, root, path, 1);
|
||||
if (wret < 0)
|
||||
ret = wret;
|
||||
|
@ -1352,7 +1357,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
ret = wret;
|
||||
}
|
||||
if (btrfs_header_nritems(&leaf->header) == 0) {
|
||||
u64 blocknr = leaf_buf->blocknr;
|
||||
u64 blocknr = leaf_buf->b_blocknr;
|
||||
clean_tree_block(trans, root, leaf_buf);
|
||||
wret = del_ptr(trans, root, path, 1, slot);
|
||||
if (wret)
|
||||
|
@ -1380,19 +1385,21 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
|
|||
int slot;
|
||||
int level = 1;
|
||||
u64 blocknr;
|
||||
struct btrfs_buffer *c;
|
||||
struct btrfs_buffer *next = NULL;
|
||||
struct buffer_head *c;
|
||||
struct btrfs_node *c_node;
|
||||
struct buffer_head *next = NULL;
|
||||
|
||||
while(level < BTRFS_MAX_LEVEL) {
|
||||
if (!path->nodes[level])
|
||||
return 1;
|
||||
slot = path->slots[level] + 1;
|
||||
c = path->nodes[level];
|
||||
if (slot >= btrfs_header_nritems(&c->node.header)) {
|
||||
c_node = btrfs_buffer_node(c);
|
||||
if (slot >= btrfs_header_nritems(&c_node->header)) {
|
||||
level++;
|
||||
continue;
|
||||
}
|
||||
blocknr = btrfs_node_blockptr(&c->node, slot);
|
||||
blocknr = btrfs_node_blockptr(c_node, slot);
|
||||
if (next)
|
||||
btrfs_block_release(root, next);
|
||||
next = read_tree_block(root, blocknr);
|
||||
|
@ -1408,7 +1415,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
|
|||
if (!level)
|
||||
break;
|
||||
next = read_tree_block(root,
|
||||
btrfs_node_blockptr(&next->node, 0));
|
||||
btrfs_node_blockptr(btrfs_buffer_node(next), 0));
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
|
@ -1,6 +1,9 @@
|
|||
#ifndef __BTRFS__
|
||||
#define __BTRFS__
|
||||
|
||||
#include <linux/radix-tree.h>
|
||||
#include <linux/fs.h>
|
||||
|
||||
struct btrfs_trans_handle;
|
||||
|
||||
#define BTRFS_MAGIC "_BtRfS_M"
|
||||
|
@ -10,6 +13,12 @@ struct btrfs_trans_handle;
|
|||
#define BTRFS_INODE_MAP_OBJECTID 3
|
||||
#define BTRFS_FS_TREE_OBJECTID 4
|
||||
|
||||
/*
|
||||
* we can actually store much bigger names, but lets not confuse the rest
|
||||
* of linux
|
||||
*/
|
||||
#define BTRFS_NAME_LEN 255
|
||||
|
||||
/*
|
||||
* the key defines the order in the tree, and so it also defines (optimal)
|
||||
* block layout. objectid corresonds to the inode number. The flags
|
||||
|
@ -57,7 +66,7 @@ struct btrfs_header {
|
|||
#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
|
||||
#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
|
||||
|
||||
struct btrfs_buffer;
|
||||
struct buffer_head;
|
||||
/*
|
||||
* the super block basically lists the main trees of the FS
|
||||
* it currently lacks any block count etc etc
|
||||
|
@ -120,7 +129,7 @@ struct btrfs_node {
|
|||
* used while walking the tree.
|
||||
*/
|
||||
struct btrfs_path {
|
||||
struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
|
||||
struct buffer_head *nodes[BTRFS_MAX_LEVEL];
|
||||
int slots[BTRFS_MAX_LEVEL];
|
||||
};
|
||||
|
||||
|
@ -211,17 +220,14 @@ struct btrfs_fs_info {
|
|||
struct btrfs_root *inode_root;
|
||||
struct btrfs_key current_insert;
|
||||
struct btrfs_key last_insert;
|
||||
struct radix_tree_root cache_radix;
|
||||
struct radix_tree_root pinned_radix;
|
||||
struct list_head trans;
|
||||
struct list_head cache;
|
||||
u64 last_inode_alloc;
|
||||
u64 last_inode_alloc_dirid;
|
||||
u64 generation;
|
||||
int cache_size;
|
||||
int fp;
|
||||
struct btrfs_trans_handle *running_transaction;
|
||||
struct btrfs_super_block *disk_super;
|
||||
struct buffer_head *sb_buffer;
|
||||
struct super_block *sb;
|
||||
};
|
||||
|
||||
/*
|
||||
|
@ -230,8 +236,8 @@ struct btrfs_fs_info {
|
|||
* only for the extent tree.
|
||||
*/
|
||||
struct btrfs_root {
|
||||
struct btrfs_buffer *node;
|
||||
struct btrfs_buffer *commit_root;
|
||||
struct buffer_head *node;
|
||||
struct buffer_head *commit_root;
|
||||
struct btrfs_root_item root_item;
|
||||
struct btrfs_key root_key;
|
||||
struct btrfs_fs_info *fs_info;
|
||||
|
@ -389,6 +395,29 @@ static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
|
|||
i->compat_flags = cpu_to_le16(val);
|
||||
}
|
||||
|
||||
static inline u32 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
|
||||
{
|
||||
return le32_to_cpu(ts->sec);
|
||||
}
|
||||
|
||||
static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
|
||||
u32 val)
|
||||
{
|
||||
ts->sec = cpu_to_le32(val);
|
||||
}
|
||||
|
||||
static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
|
||||
{
|
||||
return le32_to_cpu(ts->nsec);
|
||||
}
|
||||
|
||||
static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
|
||||
u32 val)
|
||||
{
|
||||
ts->nsec = cpu_to_le32(val);
|
||||
}
|
||||
|
||||
|
||||
|
||||
static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
|
||||
{
|
||||
|
@ -757,15 +786,20 @@ static inline void btrfs_set_file_extent_num_blocks(struct
|
|||
e->num_blocks = cpu_to_le64(val);
|
||||
}
|
||||
|
||||
static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
|
||||
{
|
||||
return sb->s_fs_info;
|
||||
}
|
||||
|
||||
/* helper function to cast into the data area of the leaf. */
|
||||
#define btrfs_item_ptr(leaf, slot, type) \
|
||||
((type *)(btrfs_leaf_data(leaf) + \
|
||||
btrfs_item_offset((leaf)->items + (slot))))
|
||||
|
||||
struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
|
||||
struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_root *root);
|
||||
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_buffer *buf);
|
||||
struct buffer_head *buf);
|
||||
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, u64 blocknr, u64 num_blocks, int pin);
|
||||
int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
|
@ -783,7 +817,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
|
||||
int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
|
||||
int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_buffer *snap);
|
||||
*root, struct buffer_head *snap);
|
||||
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
|
||||
btrfs_root *root);
|
||||
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
|
@ -800,8 +834,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
*root, char *name, int name_len, u64 dir, u64
|
||||
objectid, u8 type);
|
||||
int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_path *path, u64 dir, char *name,
|
||||
int name_len, int mod);
|
||||
*root, struct btrfs_path *path, u64 dir,
|
||||
const char *name, int name_len, int mod);
|
||||
int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
|
||||
char *name, int name_len);
|
||||
int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
|
||||
|
|
|
@ -18,12 +18,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
key.objectid = dir;
|
||||
key.flags = 0;
|
||||
btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
|
||||
if (name_len == 1 && *name == '.')
|
||||
key.offset = 1;
|
||||
else if (name_len == 2 && name[0] == '.' && name[1] == '.')
|
||||
key.offset = 2;
|
||||
else
|
||||
ret = btrfs_name_hash(name, name_len, &key.offset);
|
||||
ret = btrfs_name_hash(name, name_len, &key.offset);
|
||||
BUG_ON(ret);
|
||||
btrfs_init_path(&path);
|
||||
data_size = sizeof(*dir_item) + name_len;
|
||||
|
@ -31,7 +26,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
if (ret)
|
||||
goto out;
|
||||
|
||||
dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
|
||||
dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
|
||||
path.slots[0],
|
||||
struct btrfs_dir_item);
|
||||
btrfs_set_dir_objectid(dir_item, objectid);
|
||||
btrfs_set_dir_type(dir_item, type);
|
||||
|
@ -45,8 +41,8 @@ out:
|
|||
}
|
||||
|
||||
int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_path *path, u64 dir, char *name,
|
||||
int name_len, int mod)
|
||||
*root, struct btrfs_path *path, u64 dir,
|
||||
const char *name, int name_len, int mod)
|
||||
{
|
||||
int ret;
|
||||
struct btrfs_key key;
|
||||
|
@ -69,7 +65,8 @@ int btrfs_match_dir_item_name(struct btrfs_root *root,
|
|||
struct btrfs_dir_item *dir_item;
|
||||
char *name_ptr;
|
||||
|
||||
dir_item = btrfs_item_ptr(&path->nodes[0]->leaf, path->slots[0],
|
||||
dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
|
||||
path->slots[0],
|
||||
struct btrfs_dir_item);
|
||||
if (btrfs_dir_name_len(dir_item) != name_len)
|
||||
return 0;
|
||||
|
|
|
@ -1,165 +1,67 @@
|
|||
#define _XOPEN_SOURCE 500
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include "kerncompat.h"
|
||||
#include "radix-tree.h"
|
||||
#include <linux/module.h>
|
||||
#include <linux/fs.h>
|
||||
#include "ctree.h"
|
||||
#include "disk-io.h"
|
||||
#include "transaction.h"
|
||||
|
||||
static int allocated_blocks = 0;
|
||||
int cache_max = 10000;
|
||||
|
||||
static int check_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf)
|
||||
static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
|
||||
{
|
||||
if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
|
||||
struct btrfs_node *node = btrfs_buffer_node(buf);
|
||||
if (buf->b_blocknr != btrfs_header_blocknr(&node->header))
|
||||
BUG();
|
||||
if (root->node && btrfs_header_parentid(&buf->node.header) !=
|
||||
btrfs_header_parentid(&root->node->node.header))
|
||||
if (root->node && btrfs_header_parentid(&node->header) !=
|
||||
btrfs_header_parentid(btrfs_buffer_header(root->node)))
|
||||
BUG();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int free_some_buffers(struct btrfs_root *root)
|
||||
struct buffer_head *alloc_tree_block(struct btrfs_root *root, u64 blocknr)
|
||||
{
|
||||
struct list_head *node, *next;
|
||||
struct btrfs_buffer *b;
|
||||
if (root->fs_info->cache_size < cache_max)
|
||||
return 0;
|
||||
list_for_each_safe(node, next, &root->fs_info->cache) {
|
||||
b = list_entry(node, struct btrfs_buffer, cache);
|
||||
if (b->count == 1) {
|
||||
BUG_ON(!list_empty(&b->dirty));
|
||||
list_del_init(&b->cache);
|
||||
btrfs_block_release(root, b);
|
||||
if (root->fs_info->cache_size < cache_max)
|
||||
break;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
return sb_getblk(root->fs_info->sb, blocknr);
|
||||
}
|
||||
|
||||
struct btrfs_buffer *alloc_tree_block(struct btrfs_root *root, u64 blocknr)
|
||||
struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr)
|
||||
{
|
||||
struct btrfs_buffer *buf;
|
||||
int ret;
|
||||
return sb_getblk(root->fs_info->sb, blocknr);
|
||||
}
|
||||
|
||||
struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
|
||||
{
|
||||
struct buffer_head *buf = sb_bread(root->fs_info->sb, blocknr);
|
||||
|
||||
buf = malloc(sizeof(struct btrfs_buffer) + root->blocksize);
|
||||
if (!buf)
|
||||
return buf;
|
||||
allocated_blocks++;
|
||||
buf->blocknr = blocknr;
|
||||
buf->count = 2;
|
||||
INIT_LIST_HEAD(&buf->dirty);
|
||||
free_some_buffers(root);
|
||||
radix_tree_preload(GFP_KERNEL);
|
||||
ret = radix_tree_insert(&root->fs_info->cache_radix, blocknr, buf);
|
||||
radix_tree_preload_end();
|
||||
list_add_tail(&buf->cache, &root->fs_info->cache);
|
||||
root->fs_info->cache_size++;
|
||||
if (ret) {
|
||||
free(buf);
|
||||
return NULL;
|
||||
}
|
||||
return buf;
|
||||
}
|
||||
|
||||
struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr)
|
||||
{
|
||||
struct btrfs_buffer *buf;
|
||||
buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
|
||||
if (buf) {
|
||||
buf->count++;
|
||||
} else {
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf) {
|
||||
BUG();
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
return buf;
|
||||
}
|
||||
|
||||
struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr)
|
||||
{
|
||||
loff_t offset = blocknr * root->blocksize;
|
||||
struct btrfs_buffer *buf;
|
||||
int ret;
|
||||
|
||||
buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
|
||||
if (buf) {
|
||||
buf->count++;
|
||||
} else {
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf)
|
||||
return NULL;
|
||||
ret = pread(root->fs_info->fp, &buf->node, root->blocksize,
|
||||
offset);
|
||||
if (ret != root->blocksize) {
|
||||
free(buf);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
if (check_tree_block(root, buf))
|
||||
BUG();
|
||||
return buf;
|
||||
}
|
||||
|
||||
int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_buffer *buf)
|
||||
struct buffer_head *buf)
|
||||
{
|
||||
if (!list_empty(&buf->dirty))
|
||||
return 0;
|
||||
list_add_tail(&buf->dirty, &root->fs_info->trans);
|
||||
buf->count++;
|
||||
mark_buffer_dirty(buf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_buffer *buf)
|
||||
struct buffer_head *buf)
|
||||
{
|
||||
if (!list_empty(&buf->dirty)) {
|
||||
list_del_init(&buf->dirty);
|
||||
btrfs_block_release(root, buf);
|
||||
}
|
||||
clear_buffer_dirty(buf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_buffer *buf)
|
||||
struct buffer_head *buf)
|
||||
{
|
||||
u64 blocknr = buf->blocknr;
|
||||
loff_t offset = blocknr * root->blocksize;
|
||||
int ret;
|
||||
|
||||
if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
|
||||
BUG();
|
||||
ret = pwrite(root->fs_info->fp, &buf->node, root->blocksize, offset);
|
||||
if (ret != root->blocksize)
|
||||
return ret;
|
||||
mark_buffer_dirty(buf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __commit_transaction(struct btrfs_trans_handle *trans, struct
|
||||
btrfs_root *root)
|
||||
{
|
||||
struct btrfs_buffer *b;
|
||||
int ret = 0;
|
||||
int wret;
|
||||
while(!list_empty(&root->fs_info->trans)) {
|
||||
b = list_entry(root->fs_info->trans.next, struct btrfs_buffer,
|
||||
dirty);
|
||||
list_del_init(&b->dirty);
|
||||
wret = write_tree_block(trans, root, b);
|
||||
if (wret)
|
||||
ret = wret;
|
||||
btrfs_block_release(root, b);
|
||||
}
|
||||
return ret;
|
||||
filemap_write_and_wait(root->fs_info->sb->s_bdev->bd_inode->i_mapping);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int commit_tree_roots(struct btrfs_trans_handle *trans,
|
||||
|
@ -172,17 +74,17 @@ static int commit_tree_roots(struct btrfs_trans_handle *trans,
|
|||
struct btrfs_root *inode_root = fs_info->inode_root;
|
||||
|
||||
btrfs_set_root_blocknr(&inode_root->root_item,
|
||||
inode_root->node->blocknr);
|
||||
inode_root->node->b_blocknr);
|
||||
ret = btrfs_update_root(trans, tree_root,
|
||||
&inode_root->root_key,
|
||||
&inode_root->root_item);
|
||||
BUG_ON(ret);
|
||||
while(1) {
|
||||
old_extent_block = btrfs_root_blocknr(&extent_root->root_item);
|
||||
if (old_extent_block == extent_root->node->blocknr)
|
||||
if (old_extent_block == extent_root->node->b_blocknr)
|
||||
break;
|
||||
btrfs_set_root_blocknr(&extent_root->root_item,
|
||||
extent_root->node->blocknr);
|
||||
extent_root->node->b_blocknr);
|
||||
ret = btrfs_update_root(trans, tree_root,
|
||||
&extent_root->root_key,
|
||||
&extent_root->root_item);
|
||||
|
@ -195,7 +97,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
|
|||
btrfs_root *root, struct btrfs_super_block *s)
|
||||
{
|
||||
int ret = 0;
|
||||
struct btrfs_buffer *snap = root->commit_root;
|
||||
struct buffer_head *snap = root->commit_root;
|
||||
struct btrfs_key snap_key;
|
||||
|
||||
if (root->commit_root == root->node)
|
||||
|
@ -204,7 +106,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
|
|||
memcpy(&snap_key, &root->root_key, sizeof(snap_key));
|
||||
root->root_key.offset++;
|
||||
|
||||
btrfs_set_root_blocknr(&root->root_item, root->node->blocknr);
|
||||
btrfs_set_root_blocknr(&root->root_item, root->node->b_blocknr);
|
||||
ret = btrfs_insert_root(trans, root->fs_info->tree_root,
|
||||
&root->root_key, &root->root_item);
|
||||
BUG_ON(ret);
|
||||
|
@ -220,7 +122,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
|
|||
btrfs_finish_extent_commit(trans, root->fs_info->tree_root);
|
||||
|
||||
root->commit_root = root->node;
|
||||
root->node->count++;
|
||||
get_bh(root->node);
|
||||
ret = btrfs_drop_snapshot(trans, root, snap);
|
||||
BUG_ON(ret);
|
||||
|
||||
|
@ -234,7 +136,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
|
|||
static int __setup_root(struct btrfs_super_block *super,
|
||||
struct btrfs_root *root,
|
||||
struct btrfs_fs_info *fs_info,
|
||||
u64 objectid, int fp)
|
||||
u64 objectid)
|
||||
{
|
||||
root->node = NULL;
|
||||
root->commit_root = NULL;
|
||||
|
@ -250,11 +152,11 @@ static int find_and_setup_root(struct btrfs_super_block *super,
|
|||
struct btrfs_root *tree_root,
|
||||
struct btrfs_fs_info *fs_info,
|
||||
u64 objectid,
|
||||
struct btrfs_root *root, int fp)
|
||||
struct btrfs_root *root)
|
||||
{
|
||||
int ret;
|
||||
|
||||
__setup_root(super, root, fs_info, objectid, fp);
|
||||
__setup_root(super, root, fs_info, objectid);
|
||||
ret = btrfs_find_last_root(tree_root, objectid,
|
||||
&root->root_item, &root->root_key);
|
||||
BUG_ON(ret);
|
||||
|
@ -265,32 +167,26 @@ static int find_and_setup_root(struct btrfs_super_block *super,
|
|||
return 0;
|
||||
}
|
||||
|
||||
struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *super)
|
||||
struct btrfs_root *open_ctree(struct super_block *sb,
|
||||
struct buffer_head *sb_buffer,
|
||||
struct btrfs_super_block *disk_super)
|
||||
{
|
||||
int fp;
|
||||
|
||||
fp = open(filename, O_CREAT | O_RDWR, 0600);
|
||||
if (fp < 0) {
|
||||
return NULL;
|
||||
}
|
||||
return open_ctree_fd(fp, super);
|
||||
}
|
||||
|
||||
struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
|
||||
{
|
||||
struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
|
||||
struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
|
||||
struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
|
||||
struct btrfs_root *inode_root = malloc(sizeof(struct btrfs_root));
|
||||
struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
|
||||
struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root),
|
||||
GFP_NOFS);
|
||||
struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
|
||||
GFP_NOFS);
|
||||
struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
|
||||
GFP_NOFS);
|
||||
struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root),
|
||||
GFP_NOFS);
|
||||
struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
|
||||
GFP_NOFS);
|
||||
int ret;
|
||||
|
||||
INIT_RADIX_TREE(&fs_info->cache_radix, GFP_KERNEL);
|
||||
/* FIXME: don't be stupid */
|
||||
if (!btrfs_super_root(disk_super))
|
||||
return NULL;
|
||||
INIT_RADIX_TREE(&fs_info->pinned_radix, GFP_KERNEL);
|
||||
INIT_LIST_HEAD(&fs_info->trans);
|
||||
INIT_LIST_HEAD(&fs_info->cache);
|
||||
fs_info->cache_size = 0;
|
||||
fs_info->fp = fp;
|
||||
fs_info->running_transaction = NULL;
|
||||
fs_info->fs_root = root;
|
||||
fs_info->tree_root = tree_root;
|
||||
|
@ -298,36 +194,31 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
|
|||
fs_info->inode_root = inode_root;
|
||||
fs_info->last_inode_alloc = 0;
|
||||
fs_info->last_inode_alloc_dirid = 0;
|
||||
fs_info->disk_super = super;
|
||||
fs_info->disk_super = disk_super;
|
||||
fs_info->sb_buffer = sb_buffer;
|
||||
fs_info->sb = sb;
|
||||
memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
|
||||
memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
|
||||
|
||||
ret = pread(fp, super, sizeof(struct btrfs_super_block),
|
||||
BTRFS_SUPER_INFO_OFFSET);
|
||||
if (ret == 0 || btrfs_super_root(super) == 0) {
|
||||
BUG();
|
||||
return NULL;
|
||||
}
|
||||
BUG_ON(ret < 0);
|
||||
|
||||
__setup_root(super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID, fp);
|
||||
tree_root->node = read_tree_block(tree_root, btrfs_super_root(super));
|
||||
__setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
|
||||
tree_root->node = read_tree_block(tree_root,
|
||||
btrfs_super_root(disk_super));
|
||||
BUG_ON(!tree_root->node);
|
||||
|
||||
ret = find_and_setup_root(super, tree_root, fs_info,
|
||||
BTRFS_EXTENT_TREE_OBJECTID, extent_root, fp);
|
||||
ret = find_and_setup_root(disk_super, tree_root, fs_info,
|
||||
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
|
||||
BUG_ON(ret);
|
||||
|
||||
ret = find_and_setup_root(super, tree_root, fs_info,
|
||||
BTRFS_INODE_MAP_OBJECTID, inode_root, fp);
|
||||
ret = find_and_setup_root(disk_super, tree_root, fs_info,
|
||||
BTRFS_INODE_MAP_OBJECTID, inode_root);
|
||||
BUG_ON(ret);
|
||||
|
||||
ret = find_and_setup_root(super, tree_root, fs_info,
|
||||
BTRFS_FS_TREE_OBJECTID, root, fp);
|
||||
ret = find_and_setup_root(disk_super, tree_root, fs_info,
|
||||
BTRFS_FS_TREE_OBJECTID, root);
|
||||
BUG_ON(ret);
|
||||
|
||||
root->commit_root = root->node;
|
||||
root->node->count++;
|
||||
get_bh(root->node);
|
||||
root->ref_cows = 1;
|
||||
root->fs_info->generation = root->root_key.offset + 1;
|
||||
return root;
|
||||
|
@ -336,8 +227,11 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
|
|||
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_super_block *s)
|
||||
{
|
||||
return 0;
|
||||
#if 0
|
||||
int ret;
|
||||
btrfs_set_super_root(s, root->fs_info->tree_root->node->blocknr);
|
||||
btrfs_set_super_root(s, root->fs_info->tree_root->node->b_blocknr);
|
||||
|
||||
ret = pwrite(root->fs_info->fp, s, sizeof(*s),
|
||||
BTRFS_SUPER_INFO_OFFSET);
|
||||
if (ret != sizeof(*s)) {
|
||||
|
@ -345,35 +239,38 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
return ret;
|
||||
}
|
||||
return 0;
|
||||
#endif
|
||||
}
|
||||
|
||||
static int drop_cache(struct btrfs_root *root)
|
||||
{
|
||||
return 0;
|
||||
#if 0
|
||||
while(!list_empty(&root->fs_info->cache)) {
|
||||
struct btrfs_buffer *b = list_entry(root->fs_info->cache.next,
|
||||
struct btrfs_buffer,
|
||||
struct buffer_head *b = list_entry(root->fs_info->cache.next,
|
||||
struct buffer_head,
|
||||
cache);
|
||||
list_del_init(&b->cache);
|
||||
btrfs_block_release(root, b);
|
||||
}
|
||||
return 0;
|
||||
#endif
|
||||
}
|
||||
int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s)
|
||||
|
||||
int close_ctree(struct btrfs_root *root)
|
||||
{
|
||||
int ret;
|
||||
struct btrfs_trans_handle *trans;
|
||||
|
||||
trans = root->fs_info->running_transaction;
|
||||
btrfs_commit_transaction(trans, root, s);
|
||||
btrfs_commit_transaction(trans, root, root->fs_info->disk_super);
|
||||
ret = commit_tree_roots(trans, root->fs_info);
|
||||
BUG_ON(ret);
|
||||
ret = __commit_transaction(trans, root);
|
||||
BUG_ON(ret);
|
||||
write_ctree_super(trans, root, s);
|
||||
write_ctree_super(trans, root, root->fs_info->disk_super);
|
||||
drop_cache(root);
|
||||
BUG_ON(!list_empty(&root->fs_info->trans));
|
||||
|
||||
close(root->fs_info->fp);
|
||||
if (root->node)
|
||||
btrfs_block_release(root, root->node);
|
||||
if (root->fs_info->extent_root->node)
|
||||
|
@ -386,29 +283,17 @@ int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s)
|
|||
btrfs_block_release(root->fs_info->tree_root,
|
||||
root->fs_info->tree_root->node);
|
||||
btrfs_block_release(root, root->commit_root);
|
||||
free(root);
|
||||
printf("on close %d blocks are allocated\n", allocated_blocks);
|
||||
btrfs_block_release(root, root->fs_info->sb_buffer);
|
||||
kfree(root->fs_info->extent_root);
|
||||
kfree(root->fs_info->inode_root);
|
||||
kfree(root->fs_info->tree_root);
|
||||
kfree(root->fs_info);
|
||||
kfree(root);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf)
|
||||
void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)
|
||||
{
|
||||
buf->count--;
|
||||
if (buf->count < 0)
|
||||
BUG();
|
||||
if (buf->count == 0) {
|
||||
BUG_ON(!list_empty(&buf->cache));
|
||||
BUG_ON(!list_empty(&buf->dirty));
|
||||
if (!radix_tree_lookup(&root->fs_info->cache_radix,
|
||||
buf->blocknr))
|
||||
BUG();
|
||||
radix_tree_delete(&root->fs_info->cache_radix, buf->blocknr);
|
||||
memset(buf, 0, sizeof(*buf));
|
||||
free(buf);
|
||||
BUG_ON(allocated_blocks == 0);
|
||||
allocated_blocks--;
|
||||
BUG_ON(root->fs_info->cache_size == 0);
|
||||
root->fs_info->cache_size--;
|
||||
}
|
||||
brelse(buf);
|
||||
}
|
||||
|
||||
|
|
|
@ -1,36 +1,41 @@
|
|||
#ifndef __DISKIO__
|
||||
#define __DISKIO__
|
||||
#include "list.h"
|
||||
|
||||
struct btrfs_buffer {
|
||||
u64 blocknr;
|
||||
int count;
|
||||
struct list_head dirty;
|
||||
struct list_head cache;
|
||||
union {
|
||||
struct btrfs_node node;
|
||||
struct btrfs_leaf leaf;
|
||||
};
|
||||
};
|
||||
|
||||
struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr);
|
||||
struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr);
|
||||
int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_buffer *buf);
|
||||
int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_buffer *buf);
|
||||
int clean_tree_block(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_root *root, struct btrfs_buffer *buf);
|
||||
int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_super_block *s);
|
||||
struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *s);
|
||||
struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super);
|
||||
int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s);
|
||||
void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf);
|
||||
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_super_block *s);
|
||||
int mkfs(int fd, u64 num_blocks, u32 blocksize);
|
||||
#include <linux/buffer_head.h>
|
||||
|
||||
#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
|
||||
|
||||
static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh)
|
||||
{
|
||||
return (struct btrfs_node *)bh->b_data;
|
||||
}
|
||||
|
||||
static inline struct btrfs_leaf *btrfs_buffer_leaf(struct buffer_head *bh)
|
||||
{
|
||||
return (struct btrfs_leaf *)bh->b_data;
|
||||
}
|
||||
|
||||
static inline struct btrfs_header *btrfs_buffer_header(struct buffer_head *bh)
|
||||
{
|
||||
return &((struct btrfs_node *)bh->b_data)->header;
|
||||
}
|
||||
|
||||
struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr);
|
||||
struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr);
|
||||
int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct buffer_head *buf);
|
||||
int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct buffer_head *buf);
|
||||
int clean_tree_block(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_root *root, struct buffer_head *buf);
|
||||
int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_super_block *s);
|
||||
struct btrfs_root *open_ctree(struct super_block *sb,
|
||||
struct buffer_head *sb_buffer,
|
||||
struct btrfs_super_block *disk_super);
|
||||
int close_ctree(struct btrfs_root *root);
|
||||
void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf);
|
||||
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_super_block *s);
|
||||
int mkfs(int fd, u64 num_blocks, u32 blocksize);
|
||||
#endif
|
||||
|
|
|
@ -10,9 +10,8 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
search_end, struct btrfs_key *ins);
|
||||
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
|
||||
btrfs_root *extent_root);
|
||||
static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*extent_root);
|
||||
|
||||
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
|
||||
btrfs_root *extent_root);
|
||||
/*
|
||||
* pending extents are blocks that we're trying to allocate in the extent
|
||||
* map while trying to grow the map because of other allocations. To avoid
|
||||
|
@ -21,6 +20,7 @@ static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
* manner for deletes.
|
||||
*/
|
||||
#define CTREE_EXTENT_PENDING_DEL 0
|
||||
#define CTREE_EXTENT_PINNED 1
|
||||
|
||||
static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, u64 blocknr)
|
||||
|
@ -45,15 +45,14 @@ static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
if (ret != 0)
|
||||
BUG();
|
||||
BUG_ON(ret != 0);
|
||||
l = &path.nodes[0]->leaf;
|
||||
l = btrfs_buffer_leaf(path.nodes[0]);
|
||||
item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
|
||||
refs = btrfs_extent_refs(item);
|
||||
btrfs_set_extent_refs(item, refs + 1);
|
||||
|
||||
BUG_ON(list_empty(&path.nodes[0]->dirty));
|
||||
btrfs_release_path(root->fs_info->extent_root, &path);
|
||||
finish_current_insert(trans, root->fs_info->extent_root);
|
||||
run_pending(trans, root->fs_info->extent_root);
|
||||
del_pending_extents(trans, root->fs_info->extent_root);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -74,7 +73,7 @@ static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
0, 0);
|
||||
if (ret != 0)
|
||||
BUG();
|
||||
l = &path.nodes[0]->leaf;
|
||||
l = btrfs_buffer_leaf(path.nodes[0]);
|
||||
item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
|
||||
*refs = btrfs_extent_refs(item);
|
||||
btrfs_release_path(root->fs_info->extent_root, &path);
|
||||
|
@ -82,18 +81,20 @@ static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
}
|
||||
|
||||
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
||||
struct btrfs_buffer *buf)
|
||||
struct buffer_head *buf)
|
||||
{
|
||||
u64 blocknr;
|
||||
struct btrfs_node *buf_node;
|
||||
int i;
|
||||
|
||||
if (!root->ref_cows)
|
||||
return 0;
|
||||
if (btrfs_is_leaf(&buf->node))
|
||||
buf_node = btrfs_buffer_node(buf);
|
||||
if (btrfs_is_leaf(buf_node))
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < btrfs_header_nritems(&buf->node.header); i++) {
|
||||
blocknr = btrfs_node_blockptr(&buf->node, i);
|
||||
for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) {
|
||||
blocknr = btrfs_node_blockptr(buf_node, i);
|
||||
inc_block_ref(trans, root, blocknr);
|
||||
}
|
||||
return 0;
|
||||
|
@ -108,9 +109,10 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
|
|||
int i;
|
||||
|
||||
while(1) {
|
||||
ret = radix_tree_gang_lookup(&root->fs_info->pinned_radix,
|
||||
ret = radix_tree_gang_lookup_tag(&root->fs_info->pinned_radix,
|
||||
(void **)gang, 0,
|
||||
ARRAY_SIZE(gang));
|
||||
ARRAY_SIZE(gang),
|
||||
CTREE_EXTENT_PINNED);
|
||||
if (!ret)
|
||||
break;
|
||||
if (!first)
|
||||
|
@ -137,7 +139,7 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
|
|||
|
||||
btrfs_set_extent_refs(&extent_item, 1);
|
||||
btrfs_set_extent_owner(&extent_item,
|
||||
btrfs_header_parentid(&extent_root->node->node.header));
|
||||
btrfs_header_parentid(btrfs_buffer_header(extent_root->node)));
|
||||
ins.offset = 1;
|
||||
ins.flags = 0;
|
||||
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
|
||||
|
@ -156,11 +158,24 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int pin_down_block(struct btrfs_root *root, u64 blocknr, int tag)
|
||||
{
|
||||
int err;
|
||||
err = radix_tree_insert(&root->fs_info->pinned_radix,
|
||||
blocknr, (void *)blocknr);
|
||||
BUG_ON(err);
|
||||
if (err)
|
||||
return err;
|
||||
radix_tree_tag_set(&root->fs_info->pinned_radix, blocknr,
|
||||
tag);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* remove an extent from the root, returns 0 on success
|
||||
*/
|
||||
static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, u64 blocknr, u64 num_blocks, int pin)
|
||||
*root, u64 blocknr, u64 num_blocks)
|
||||
{
|
||||
struct btrfs_path path;
|
||||
struct btrfs_key key;
|
||||
|
@ -171,7 +186,6 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
struct btrfs_key ins;
|
||||
u32 refs;
|
||||
|
||||
BUG_ON(pin && num_blocks != 1);
|
||||
key.objectid = blocknr;
|
||||
key.flags = 0;
|
||||
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
|
||||
|
@ -186,26 +200,18 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
printk("failed to find %Lu\n", key.objectid);
|
||||
BUG();
|
||||
}
|
||||
ei = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
|
||||
ei = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
|
||||
struct btrfs_extent_item);
|
||||
BUG_ON(ei->refs == 0);
|
||||
refs = btrfs_extent_refs(ei) - 1;
|
||||
btrfs_set_extent_refs(ei, refs);
|
||||
if (refs == 0) {
|
||||
u64 super_blocks_used;
|
||||
if (pin) {
|
||||
int err;
|
||||
radix_tree_preload(GFP_KERNEL);
|
||||
err = radix_tree_insert(&info->pinned_radix,
|
||||
blocknr, (void *)blocknr);
|
||||
BUG_ON(err);
|
||||
radix_tree_preload_end();
|
||||
}
|
||||
super_blocks_used = btrfs_super_blocks_used(info->disk_super);
|
||||
btrfs_set_super_blocks_used(info->disk_super,
|
||||
super_blocks_used - num_blocks);
|
||||
ret = btrfs_del_item(trans, extent_root, &path);
|
||||
if (!pin && extent_root->fs_info->last_insert.objectid >
|
||||
if (extent_root->fs_info->last_insert.objectid >
|
||||
blocknr)
|
||||
extent_root->fs_info->last_insert.objectid = blocknr;
|
||||
if (ret)
|
||||
|
@ -224,39 +230,32 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct
|
|||
btrfs_root *extent_root)
|
||||
{
|
||||
int ret;
|
||||
struct btrfs_buffer *gang[4];
|
||||
int wret;
|
||||
int err = 0;
|
||||
unsigned long gang[4];
|
||||
int i;
|
||||
struct radix_tree_root *radix = &extent_root->fs_info->pinned_radix;
|
||||
|
||||
while(1) {
|
||||
ret = radix_tree_gang_lookup_tag(
|
||||
&extent_root->fs_info->cache_radix,
|
||||
&extent_root->fs_info->pinned_radix,
|
||||
(void **)gang, 0,
|
||||
ARRAY_SIZE(gang),
|
||||
CTREE_EXTENT_PENDING_DEL);
|
||||
if (!ret)
|
||||
break;
|
||||
for (i = 0; i < ret; i++) {
|
||||
ret = __free_extent(trans, extent_root,
|
||||
gang[i]->blocknr, 1, 1);
|
||||
radix_tree_tag_clear(&extent_root->fs_info->cache_radix,
|
||||
gang[i]->blocknr,
|
||||
radix_tree_tag_set(radix, gang[i], CTREE_EXTENT_PINNED);
|
||||
radix_tree_tag_clear(radix, gang[i],
|
||||
CTREE_EXTENT_PENDING_DEL);
|
||||
btrfs_block_release(extent_root, gang[i]);
|
||||
wret = __free_extent(trans, extent_root, gang[i], 1);
|
||||
if (wret)
|
||||
err = wret;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
return err;
|
||||
}
|
||||
|
||||
static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*extent_root)
|
||||
{
|
||||
while(radix_tree_tagged(&extent_root->fs_info->cache_radix,
|
||||
CTREE_EXTENT_PENDING_DEL))
|
||||
del_pending_extents(trans, extent_root);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* remove an extent from the root, returns 0 on success
|
||||
*/
|
||||
|
@ -264,18 +263,21 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
*root, u64 blocknr, u64 num_blocks, int pin)
|
||||
{
|
||||
struct btrfs_root *extent_root = root->fs_info->extent_root;
|
||||
struct btrfs_buffer *t;
|
||||
struct buffer_head *t;
|
||||
int pending_ret;
|
||||
int ret;
|
||||
|
||||
if (root == extent_root) {
|
||||
t = find_tree_block(root, blocknr);
|
||||
radix_tree_tag_set(&root->fs_info->cache_radix, blocknr,
|
||||
CTREE_EXTENT_PENDING_DEL);
|
||||
pin_down_block(root, blocknr, CTREE_EXTENT_PENDING_DEL);
|
||||
return 0;
|
||||
}
|
||||
ret = __free_extent(trans, root, blocknr, num_blocks, pin);
|
||||
pending_ret = run_pending(trans, root->fs_info->extent_root);
|
||||
if (pin) {
|
||||
ret = pin_down_block(root, blocknr, CTREE_EXTENT_PINNED);
|
||||
BUG_ON(ret);
|
||||
}
|
||||
ret = __free_extent(trans, root, blocknr, num_blocks);
|
||||
pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
|
||||
return ret ? ret : pending_ret;
|
||||
}
|
||||
|
||||
|
@ -296,14 +298,16 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
int ret;
|
||||
u64 hole_size = 0;
|
||||
int slot = 0;
|
||||
u64 last_block;
|
||||
u64 last_block = 0;
|
||||
u64 test_block;
|
||||
int start_found;
|
||||
struct btrfs_leaf *l;
|
||||
struct btrfs_root * root = orig_root->fs_info->extent_root;
|
||||
int total_needed = num_blocks;
|
||||
int level;
|
||||
|
||||
total_needed += (btrfs_header_level(&root->node->node.header) + 1) * 3;
|
||||
level = btrfs_header_level(btrfs_buffer_header(root->node));
|
||||
total_needed += (level + 1) * 3;
|
||||
if (root->fs_info->last_insert.objectid > search_start)
|
||||
search_start = root->fs_info->last_insert.objectid;
|
||||
|
||||
|
@ -323,7 +327,7 @@ check_failed:
|
|||
path.slots[0]--;
|
||||
|
||||
while (1) {
|
||||
l = &path.nodes[0]->leaf;
|
||||
l = btrfs_buffer_leaf(path.nodes[0]);
|
||||
slot = path.slots[0];
|
||||
if (slot >= btrfs_header_nritems(&l->header)) {
|
||||
ret = btrfs_next_leaf(root, &path);
|
||||
|
@ -429,7 +433,7 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
sizeof(extent_item));
|
||||
|
||||
finish_current_insert(trans, extent_root);
|
||||
pending_ret = run_pending(trans, extent_root);
|
||||
pending_ret = del_pending_extents(trans, extent_root);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (pending_ret)
|
||||
|
@ -441,16 +445,15 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
* helper function to allocate a block for a given tree
|
||||
* returns the tree buffer or NULL.
|
||||
*/
|
||||
struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
|
||||
struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_root *root)
|
||||
{
|
||||
struct btrfs_key ins;
|
||||
int ret;
|
||||
struct btrfs_buffer *buf;
|
||||
struct buffer_head *buf;
|
||||
|
||||
ret = alloc_extent(trans, root, 1, 0, (unsigned long)-1,
|
||||
btrfs_header_parentid(&root->node->node.header),
|
||||
&ins);
|
||||
btrfs_header_parentid(btrfs_buffer_header(root->node)), &ins);
|
||||
if (ret) {
|
||||
BUG();
|
||||
return NULL;
|
||||
|
@ -467,13 +470,13 @@ struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
|
|||
static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_path *path, int *level)
|
||||
{
|
||||
struct btrfs_buffer *next;
|
||||
struct btrfs_buffer *cur;
|
||||
struct buffer_head *next;
|
||||
struct buffer_head *cur;
|
||||
u64 blocknr;
|
||||
int ret;
|
||||
u32 refs;
|
||||
|
||||
ret = lookup_block_ref(trans, root, path->nodes[*level]->blocknr,
|
||||
ret = lookup_block_ref(trans, root, path->nodes[*level]->b_blocknr,
|
||||
&refs);
|
||||
BUG_ON(ret);
|
||||
if (refs > 1)
|
||||
|
@ -484,9 +487,10 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
while(*level > 0) {
|
||||
cur = path->nodes[*level];
|
||||
if (path->slots[*level] >=
|
||||
btrfs_header_nritems(&cur->node.header))
|
||||
btrfs_header_nritems(btrfs_buffer_header(cur)))
|
||||
break;
|
||||
blocknr = btrfs_node_blockptr(&cur->node, path->slots[*level]);
|
||||
blocknr = btrfs_node_blockptr(btrfs_buffer_node(cur),
|
||||
path->slots[*level]);
|
||||
ret = lookup_block_ref(trans, root, blocknr, &refs);
|
||||
if (refs != 1 || *level == 1) {
|
||||
path->slots[*level]++;
|
||||
|
@ -499,12 +503,12 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
if (path->nodes[*level-1])
|
||||
btrfs_block_release(root, path->nodes[*level-1]);
|
||||
path->nodes[*level-1] = next;
|
||||
*level = btrfs_header_level(&next->node.header);
|
||||
*level = btrfs_header_level(btrfs_buffer_header(next));
|
||||
path->slots[*level] = 0;
|
||||
}
|
||||
out:
|
||||
ret = btrfs_free_extent(trans, root, path->nodes[*level]->blocknr, 1,
|
||||
1);
|
||||
ret = btrfs_free_extent(trans, root, path->nodes[*level]->b_blocknr,
|
||||
1, 1);
|
||||
btrfs_block_release(root, path->nodes[*level]);
|
||||
path->nodes[*level] = NULL;
|
||||
*level += 1;
|
||||
|
@ -525,14 +529,14 @@ static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
int ret;
|
||||
for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
|
||||
slot = path->slots[i];
|
||||
if (slot <
|
||||
btrfs_header_nritems(&path->nodes[i]->node.header)- 1) {
|
||||
if (slot < btrfs_header_nritems(
|
||||
btrfs_buffer_header(path->nodes[i])) - 1) {
|
||||
path->slots[i]++;
|
||||
*level = i;
|
||||
return 0;
|
||||
} else {
|
||||
ret = btrfs_free_extent(trans, root,
|
||||
path->nodes[*level]->blocknr,
|
||||
path->nodes[*level]->b_blocknr,
|
||||
1, 1);
|
||||
btrfs_block_release(root, path->nodes[*level]);
|
||||
path->nodes[*level] = NULL;
|
||||
|
@ -549,7 +553,7 @@ static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
* decremented.
|
||||
*/
|
||||
int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
|
||||
*root, struct btrfs_buffer *snap)
|
||||
*root, struct buffer_head *snap)
|
||||
{
|
||||
int ret = 0;
|
||||
int wret;
|
||||
|
@ -560,7 +564,7 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
|
||||
btrfs_init_path(&path);
|
||||
|
||||
level = btrfs_header_level(&snap->node.header);
|
||||
level = btrfs_header_level(btrfs_buffer_header(snap));
|
||||
orig_level = level;
|
||||
path.nodes[level] = snap;
|
||||
path.slots[level] = 0;
|
||||
|
|
|
@ -10,6 +10,7 @@
|
|||
* License.
|
||||
*/
|
||||
|
||||
#include <linux/types.h>
|
||||
#define DELTA 0x9E3779B9
|
||||
|
||||
static void TEA_transform(__u32 buf[2], __u32 const in[])
|
||||
|
@ -63,6 +64,14 @@ int btrfs_name_hash(const char *name, int len, u64 *hash_result)
|
|||
const char *p;
|
||||
__u32 in[8], buf[2];
|
||||
|
||||
if (len == 1 && *name == '.') {
|
||||
*hash_result = 1;
|
||||
return 0;
|
||||
} else if (len == 2 && name[0] == '.' && name[1] == '.') {
|
||||
*hash_result = 2;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Initialize the default seed for the hash checksum functions */
|
||||
buf[0] = 0x67452301;
|
||||
buf[1] = 0xefcdab89;
|
||||
|
|
|
@ -15,7 +15,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
|
|||
int ret;
|
||||
u64 hole_size = 0;
|
||||
int slot = 0;
|
||||
u64 last_ino;
|
||||
u64 last_ino = 0;
|
||||
int start_found;
|
||||
struct btrfs_leaf *l;
|
||||
struct btrfs_root *root = fs_root->fs_info->inode_root;
|
||||
|
@ -40,7 +40,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
|
|||
path.slots[0]--;
|
||||
|
||||
while (1) {
|
||||
l = &path.nodes[0]->leaf;
|
||||
l = btrfs_buffer_leaf(path.nodes[0]);
|
||||
slot = path.slots[0];
|
||||
if (slot >= btrfs_header_nritems(&l->header)) {
|
||||
ret = btrfs_next_leaf(root, &path);
|
||||
|
@ -105,8 +105,8 @@ int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
|
|||
if (ret)
|
||||
goto out;
|
||||
|
||||
inode_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
|
||||
struct btrfs_inode_map_item);
|
||||
inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
|
||||
path.slots[0], struct btrfs_inode_map_item);
|
||||
btrfs_cpu_key_to_disk(&inode_item->key, location);
|
||||
out:
|
||||
btrfs_release_path(inode_root, &path);
|
||||
|
|
|
@ -17,7 +17,6 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
|
|||
printk("leaf %Lu total ptrs %d free space %d\n",
|
||||
btrfs_header_blocknr(&l->header), nr,
|
||||
btrfs_leaf_free_space(root, l));
|
||||
fflush(stdout);
|
||||
for (i = 0 ; i < nr ; i++) {
|
||||
item = l->items + i;
|
||||
type = btrfs_disk_key_type(&item->key);
|
||||
|
@ -67,10 +66,10 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
|
|||
btrfs_leaf_data(l) + btrfs_item_offset(item));
|
||||
break;
|
||||
};
|
||||
fflush(stdout);
|
||||
}
|
||||
}
|
||||
void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t)
|
||||
|
||||
void btrfs_print_tree(struct btrfs_root *root, struct buffer_head *t)
|
||||
{
|
||||
int i;
|
||||
u32 nr;
|
||||
|
@ -78,16 +77,16 @@ void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t)
|
|||
|
||||
if (!t)
|
||||
return;
|
||||
c = &t->node;
|
||||
c = btrfs_buffer_node(t);
|
||||
nr = btrfs_header_nritems(&c->header);
|
||||
if (btrfs_is_leaf(c)) {
|
||||
btrfs_print_leaf(root, (struct btrfs_leaf *)c);
|
||||
return;
|
||||
}
|
||||
printk("node %Lu level %d total ptrs %d free spc %u\n", t->blocknr,
|
||||
btrfs_header_level(&c->header), nr,
|
||||
(u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr);
|
||||
fflush(stdout);
|
||||
printk("node %Lu level %d total ptrs %d free spc %u\n",
|
||||
btrfs_header_blocknr(&c->header),
|
||||
btrfs_header_level(&c->header), nr,
|
||||
(u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr);
|
||||
for (i = 0; i < nr; i++) {
|
||||
printk("\tkey %d (%Lu %u %Lu) block %Lu\n",
|
||||
i,
|
||||
|
@ -95,12 +94,11 @@ void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t)
|
|||
c->ptrs[i].key.flags,
|
||||
c->ptrs[i].key.offset,
|
||||
btrfs_node_blockptr(c, i));
|
||||
fflush(stdout);
|
||||
}
|
||||
for (i = 0; i < nr; i++) {
|
||||
struct btrfs_buffer *next_buf = read_tree_block(root,
|
||||
struct buffer_head *next_buf = read_tree_block(root,
|
||||
btrfs_node_blockptr(c, i));
|
||||
struct btrfs_node *next = &next_buf->node;
|
||||
struct btrfs_node *next = btrfs_buffer_node(next_buf);
|
||||
if (btrfs_is_leaf(next) &&
|
||||
btrfs_header_level(&c->header) != 1)
|
||||
BUG();
|
||||
|
|
|
@ -1,5 +1,5 @@
|
|||
#ifndef __PRINT_TREE_
|
||||
#define __PRINT_TREE_
|
||||
void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l);
|
||||
void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t);
|
||||
void btrfs_print_tree(struct btrfs_root *root, struct buffer_head *t);
|
||||
#endif
|
||||
|
|
|
@ -21,7 +21,7 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
|
|||
if (ret < 0)
|
||||
goto out;
|
||||
BUG_ON(ret == 0);
|
||||
l = &path.nodes[0]->leaf;
|
||||
l = btrfs_buffer_leaf(path.nodes[0]);
|
||||
BUG_ON(path.slots[0] == 0);
|
||||
slot = path.slots[0] - 1;
|
||||
if (btrfs_disk_key_objectid(&l->items[slot].key) != objectid) {
|
||||
|
@ -51,7 +51,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
|
|||
if (ret < 0)
|
||||
goto out;
|
||||
BUG_ON(ret != 0);
|
||||
l = &path.nodes[0]->leaf;
|
||||
l = btrfs_buffer_leaf(path.nodes[0]);
|
||||
slot = path.slots[0];
|
||||
memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
|
||||
sizeof(*item));
|
||||
|
|
263
fs/btrfs/super.c
263
fs/btrfs/super.c
|
@ -1,4 +1,5 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/buffer_head.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/highmem.h>
|
||||
|
@ -8,13 +9,18 @@
|
|||
#include <linux/smp_lock.h>
|
||||
#include <linux/backing-dev.h>
|
||||
#include "ctree.h"
|
||||
#include "disk-io.h"
|
||||
|
||||
#define BTRFS_SUPER_MAGIC 0x9123682E
|
||||
|
||||
static struct inode_operations btrfs_dir_inode_operations;
|
||||
static struct super_operations btrfs_super_ops;
|
||||
static struct file_operations btrfs_dir_file_operations;
|
||||
|
||||
#if 0
|
||||
/* some random number */
|
||||
|
||||
static struct super_operations ramfs_ops;
|
||||
static struct inode_operations ramfs_dir_inode_operations;
|
||||
|
||||
static struct backing_dev_info ramfs_backing_dev_info = {
|
||||
.ra_pages = 0, /* No readahead */
|
||||
|
@ -129,46 +135,243 @@ static struct inode_operations ramfs_dir_inode_operations = {
|
|||
};
|
||||
#endif
|
||||
|
||||
struct inode *btrfs_get_inode(struct super_block *sb, int mode, dev_t dev)
|
||||
static void btrfs_read_locked_inode(struct inode *inode)
|
||||
{
|
||||
struct inode * inode = new_inode(sb);
|
||||
|
||||
if (inode) {
|
||||
inode->i_mode = mode;
|
||||
inode->i_uid = current->fsuid;
|
||||
inode->i_gid = current->fsgid;
|
||||
inode->i_blocks = 0;
|
||||
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
||||
struct btrfs_path path;
|
||||
struct btrfs_inode_item *inode_item;
|
||||
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
||||
int ret;
|
||||
printk("read locked inode %lu\n", inode->i_ino);
|
||||
btrfs_init_path(&path);
|
||||
ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
|
||||
if (ret) {
|
||||
make_bad_inode(inode);
|
||||
return;
|
||||
}
|
||||
return inode;
|
||||
inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
|
||||
path.slots[0],
|
||||
struct btrfs_inode_item);
|
||||
|
||||
printk("found locked inode %lu\n", inode->i_ino);
|
||||
inode->i_mode = btrfs_inode_mode(inode_item);
|
||||
inode->i_nlink = btrfs_inode_nlink(inode_item);
|
||||
inode->i_uid = btrfs_inode_uid(inode_item);
|
||||
inode->i_gid = btrfs_inode_gid(inode_item);
|
||||
inode->i_size = btrfs_inode_size(inode_item);
|
||||
inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
|
||||
inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
|
||||
inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
|
||||
inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
|
||||
inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
|
||||
inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
|
||||
inode->i_blocks = btrfs_inode_nblocks(inode_item);
|
||||
inode->i_generation = btrfs_inode_generation(inode_item);
|
||||
printk("about to release\n");
|
||||
btrfs_release_path(root, &path);
|
||||
switch (inode->i_mode & S_IFMT) {
|
||||
#if 0
|
||||
default:
|
||||
init_special_inode(inode, inode->i_mode,
|
||||
btrfs_inode_rdev(inode_item));
|
||||
break;
|
||||
#endif
|
||||
case S_IFREG:
|
||||
printk("inode %lu now a file\n", inode->i_ino);
|
||||
break;
|
||||
case S_IFDIR:
|
||||
printk("inode %lu now a directory\n", inode->i_ino);
|
||||
inode->i_op = &btrfs_dir_inode_operations;
|
||||
inode->i_fop = &btrfs_dir_file_operations;
|
||||
break;
|
||||
case S_IFLNK:
|
||||
printk("inode %lu now a link\n", inode->i_ino);
|
||||
// inode->i_op = &page_symlink_inode_operations;
|
||||
break;
|
||||
}
|
||||
printk("returning!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
static struct super_operations btrfs_ops = {
|
||||
.statfs = simple_statfs,
|
||||
.drop_inode = generic_delete_inode,
|
||||
};
|
||||
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
|
||||
ino_t *ino)
|
||||
{
|
||||
const char *name = dentry->d_name.name;
|
||||
int namelen = dentry->d_name.len;
|
||||
struct btrfs_dir_item *di;
|
||||
struct btrfs_path path;
|
||||
struct btrfs_root *root = btrfs_sb(dir->i_sb);
|
||||
int ret;
|
||||
|
||||
btrfs_init_path(&path);
|
||||
ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
|
||||
namelen, 0);
|
||||
if (ret) {
|
||||
*ino = 0;
|
||||
goto out;
|
||||
}
|
||||
di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
|
||||
struct btrfs_dir_item);
|
||||
*ino = btrfs_dir_objectid(di);
|
||||
out:
|
||||
btrfs_release_path(root, &path);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
|
||||
struct nameidata *nd)
|
||||
{
|
||||
struct inode * inode;
|
||||
ino_t ino;
|
||||
int ret;
|
||||
|
||||
if (dentry->d_name.len > BTRFS_NAME_LEN)
|
||||
return ERR_PTR(-ENAMETOOLONG);
|
||||
|
||||
ret = btrfs_inode_by_name(dir, dentry, &ino);
|
||||
if (ret < 0)
|
||||
return ERR_PTR(ret);
|
||||
inode = NULL;
|
||||
if (ino) {
|
||||
printk("lookup on %.*s returns %lu\n", dentry->d_name.len, dentry->d_name.name, ino);
|
||||
inode = iget(dir->i_sb, ino);
|
||||
if (!inode)
|
||||
return ERR_PTR(-EACCES);
|
||||
}
|
||||
return d_splice_alias(inode, dentry);
|
||||
}
|
||||
|
||||
static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
||||
{
|
||||
struct inode *inode = filp->f_path.dentry->d_inode;
|
||||
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
||||
struct btrfs_item *item;
|
||||
struct btrfs_dir_item *di;
|
||||
struct btrfs_key key;
|
||||
struct btrfs_path path;
|
||||
int ret;
|
||||
u32 nritems;
|
||||
struct btrfs_leaf *leaf;
|
||||
int slot;
|
||||
int advance;
|
||||
unsigned char d_type = DT_UNKNOWN;
|
||||
int over;
|
||||
|
||||
key.objectid = inode->i_ino;
|
||||
printk("readdir on dir %Lu pos %Lu\n", key.objectid, filp->f_pos);
|
||||
key.flags = 0;
|
||||
btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
|
||||
key.offset = filp->f_pos;
|
||||
btrfs_init_path(&path);
|
||||
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
|
||||
if (ret < 0) {
|
||||
goto err;
|
||||
}
|
||||
printk("first ret %d\n", ret);
|
||||
advance = filp->f_pos > 0 && ret != 0;
|
||||
while(1) {
|
||||
leaf = btrfs_buffer_leaf(path.nodes[0]);
|
||||
nritems = btrfs_header_nritems(&leaf->header);
|
||||
slot = path.slots[0];
|
||||
printk("leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot);
|
||||
if (advance) {
|
||||
printk("advancing!\n");
|
||||
if (slot == nritems -1) {
|
||||
ret = btrfs_next_leaf(root, &path);
|
||||
if (ret)
|
||||
break;
|
||||
leaf = btrfs_buffer_leaf(path.nodes[0]);
|
||||
nritems = btrfs_header_nritems(&leaf->header);
|
||||
slot = path.slots[0];
|
||||
printk("2leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot);
|
||||
} else {
|
||||
slot++;
|
||||
path.slots[0]++;
|
||||
}
|
||||
}
|
||||
advance = 1;
|
||||
item = leaf->items + slot;
|
||||
printk("item key %Lu %u %Lu\n", btrfs_disk_key_objectid(&item->key),
|
||||
btrfs_disk_key_flags(&item->key), btrfs_disk_key_offset(&item->key));
|
||||
if (btrfs_disk_key_objectid(&item->key) != key.objectid)
|
||||
break;
|
||||
if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
|
||||
continue;
|
||||
di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
|
||||
printk("filldir name %.*s, objectid %Lu\n", btrfs_dir_name_len(di),
|
||||
(const char *)(di + 1), btrfs_dir_objectid(di));
|
||||
over = filldir(dirent, (const char *)(di + 1),
|
||||
btrfs_dir_name_len(di),
|
||||
btrfs_disk_key_offset(&item->key),
|
||||
btrfs_dir_objectid(di), d_type);
|
||||
if (over)
|
||||
break;
|
||||
filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
|
||||
}
|
||||
printk("filldir all done\n");
|
||||
ret = 0;
|
||||
err:
|
||||
btrfs_release_path(root, &path);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void btrfs_put_super (struct super_block * sb)
|
||||
{
|
||||
struct btrfs_root *root = btrfs_sb(sb);
|
||||
int ret;
|
||||
|
||||
ret = close_ctree(root);
|
||||
if (ret) {
|
||||
printk("close ctree returns %d\n", ret);
|
||||
}
|
||||
sb->s_fs_info = NULL;
|
||||
}
|
||||
|
||||
static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
|
||||
{
|
||||
struct inode * inode;
|
||||
struct dentry * root;
|
||||
struct dentry * root_dentry;
|
||||
struct btrfs_super_block *disk_super;
|
||||
struct buffer_head *bh;
|
||||
struct btrfs_root *root;
|
||||
|
||||
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
||||
sb->s_blocksize = PAGE_CACHE_SIZE;
|
||||
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
|
||||
sb->s_magic = BTRFS_SUPER_MAGIC;
|
||||
sb->s_op = &btrfs_ops;
|
||||
sb->s_op = &btrfs_super_ops;
|
||||
sb->s_time_gran = 1;
|
||||
inode = btrfs_get_inode(sb, S_IFDIR | 0755, 0);
|
||||
|
||||
bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
|
||||
if (!bh) {
|
||||
printk("btrfs: unable to read on disk super\n");
|
||||
return -EIO;
|
||||
}
|
||||
disk_super = (struct btrfs_super_block *)bh->b_data;
|
||||
root = open_ctree(sb, bh, disk_super);
|
||||
sb->s_fs_info = root;
|
||||
if (!root) {
|
||||
printk("btrfs: open_ctree failed\n");
|
||||
return -EIO;
|
||||
}
|
||||
printk("read in super total blocks %Lu root %Lu\n",
|
||||
btrfs_super_total_blocks(disk_super),
|
||||
btrfs_super_root_dir(disk_super));
|
||||
|
||||
inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
|
||||
if (!inode)
|
||||
return -ENOMEM;
|
||||
if (inode->i_state & I_NEW) {
|
||||
btrfs_read_locked_inode(inode);
|
||||
unlock_new_inode(inode);
|
||||
}
|
||||
|
||||
root = d_alloc_root(inode);
|
||||
if (!root) {
|
||||
root_dentry = d_alloc_root(inode);
|
||||
if (!root_dentry) {
|
||||
iput(inode);
|
||||
return -ENOMEM;
|
||||
}
|
||||
sb->s_root = root;
|
||||
sb->s_root = root_dentry;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -187,6 +390,24 @@ static struct file_system_type btrfs_fs_type = {
|
|||
.fs_flags = FS_REQUIRES_DEV,
|
||||
};
|
||||
|
||||
static struct super_operations btrfs_super_ops = {
|
||||
.statfs = simple_statfs,
|
||||
.drop_inode = generic_delete_inode,
|
||||
.put_super = btrfs_put_super,
|
||||
.read_inode = btrfs_read_locked_inode,
|
||||
};
|
||||
|
||||
static struct inode_operations btrfs_dir_inode_operations = {
|
||||
.lookup = btrfs_lookup,
|
||||
};
|
||||
|
||||
static struct file_operations btrfs_dir_file_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = generic_read_dir,
|
||||
.readdir = btrfs_readdir,
|
||||
};
|
||||
|
||||
|
||||
static int __init init_btrfs_fs(void)
|
||||
{
|
||||
printk("btrfs loaded!\n");
|
||||
|
|
|
@ -10,7 +10,7 @@ struct btrfs_trans_handle {
|
|||
static inline struct btrfs_trans_handle *
|
||||
btrfs_start_transaction(struct btrfs_root *root, int num_blocks)
|
||||
{
|
||||
struct btrfs_trans_handle *h = malloc(sizeof(*h));
|
||||
struct btrfs_trans_handle *h = kmalloc(sizeof(*h), GFP_NOFS);
|
||||
h->transid = root->root_key.offset;
|
||||
h->blocks_reserved = num_blocks;
|
||||
h->blocks_used = 0;
|
||||
|
@ -21,7 +21,7 @@ static inline void btrfs_free_transaction(struct btrfs_root *root,
|
|||
struct btrfs_trans_handle *handle)
|
||||
{
|
||||
memset(handle, 0, sizeof(*handle));
|
||||
free(handle);
|
||||
kfree(handle);
|
||||
}
|
||||
|
||||
#endif
|
||||
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