#include "ctree.h"
#include "transaction.h"
#include "btrfs_inode.h"
+#include "extent_io.h"
-struct tree_entry {
- u64 root_objectid;
- u64 objectid;
- struct inode *inode;
- struct rb_node rb_node;
-};
-/*
- * returns > 0 if entry passed (root, objectid) is > entry,
- * < 0 if (root, objectid) < entry and zero if they are equal
- */
-static int comp_entry(struct tree_entry *entry, u64 root_objectid,
- u64 objectid)
+static u64 entry_end(struct btrfs_ordered_extent *entry)
{
- if (root_objectid < entry->root_objectid)
- return -1;
- if (root_objectid > entry->root_objectid)
- return 1;
- if (objectid < entry->objectid)
- return -1;
- if (objectid > entry->objectid)
- return 1;
- return 0;
+ if (entry->file_offset + entry->len < entry->file_offset)
+ return (u64)-1;
+ return entry->file_offset + entry->len;
}
-static struct rb_node *tree_insert(struct rb_root *root, u64 root_objectid,
- u64 objectid, struct rb_node *node)
+static struct rb_node *tree_insert(struct rb_root *root, u64 file_offset,
+ struct rb_node *node)
{
struct rb_node ** p = &root->rb_node;
struct rb_node * parent = NULL;
- struct tree_entry *entry;
- int comp;
+ struct btrfs_ordered_extent *entry;
while(*p) {
parent = *p;
- entry = rb_entry(parent, struct tree_entry, rb_node);
+ entry = rb_entry(parent, struct btrfs_ordered_extent, rb_node);
- comp = comp_entry(entry, root_objectid, objectid);
- if (comp < 0)
+ if (file_offset < entry->file_offset)
p = &(*p)->rb_left;
- else if (comp > 0)
+ else if (file_offset >= entry_end(entry))
p = &(*p)->rb_right;
else
return parent;
return NULL;
}
-static struct rb_node *__tree_search(struct rb_root *root, u64 root_objectid,
- u64 objectid, struct rb_node **prev_ret)
+static struct rb_node *__tree_search(struct rb_root *root, u64 file_offset,
+ struct rb_node **prev_ret)
{
struct rb_node * n = root->rb_node;
struct rb_node *prev = NULL;
- struct tree_entry *entry;
- struct tree_entry *prev_entry = NULL;
- int comp;
+ struct rb_node *test;
+ struct btrfs_ordered_extent *entry;
+ struct btrfs_ordered_extent *prev_entry = NULL;
while(n) {
- entry = rb_entry(n, struct tree_entry, rb_node);
+ entry = rb_entry(n, struct btrfs_ordered_extent, rb_node);
prev = n;
prev_entry = entry;
- comp = comp_entry(entry, root_objectid, objectid);
- if (comp < 0)
+ if (file_offset < entry->file_offset)
n = n->rb_left;
- else if (comp > 0)
+ else if (file_offset >= entry_end(entry))
n = n->rb_right;
else
return n;
if (!prev_ret)
return NULL;
- while(prev && comp_entry(prev_entry, root_objectid, objectid) >= 0) {
- prev = rb_next(prev);
- prev_entry = rb_entry(prev, struct tree_entry, rb_node);
+ while(prev && file_offset >= entry_end(prev_entry)) {
+ test = rb_next(prev);
+ if (!test)
+ break;
+ prev_entry = rb_entry(test, struct btrfs_ordered_extent,
+ rb_node);
+ if (file_offset < entry_end(prev_entry))
+ break;
+
+ prev = test;
+ }
+ if (prev)
+ prev_entry = rb_entry(prev, struct btrfs_ordered_extent,
+ rb_node);
+ while(prev && file_offset < entry_end(prev_entry)) {
+ test = rb_prev(prev);
+ if (!test)
+ break;
+ prev_entry = rb_entry(test, struct btrfs_ordered_extent,
+ rb_node);
+ prev = test;
}
*prev_ret = prev;
return NULL;
}
-static inline struct rb_node *tree_search(struct rb_root *root,
- u64 root_objectid, u64 objectid)
+static int offset_in_entry(struct btrfs_ordered_extent *entry, u64 file_offset)
+{
+ if (file_offset < entry->file_offset ||
+ entry->file_offset + entry->len <= file_offset)
+ return 0;
+ return 1;
+}
+
+static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
+ u64 file_offset)
{
+ struct rb_root *root = &tree->tree;
struct rb_node *prev;
struct rb_node *ret;
- ret = __tree_search(root, root_objectid, objectid, &prev);
+ struct btrfs_ordered_extent *entry;
+
+ if (tree->last) {
+ entry = rb_entry(tree->last, struct btrfs_ordered_extent,
+ rb_node);
+ if (offset_in_entry(entry, file_offset))
+ return tree->last;
+ }
+ ret = __tree_search(root, file_offset, &prev);
if (!ret)
- return prev;
+ ret = prev;
+ if (ret)
+ tree->last = ret;
return ret;
}
-int btrfs_add_ordered_inode(struct inode *inode)
+int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
+ u64 start, u64 len)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 root_objectid = root->root_key.objectid;
- u64 transid = root->fs_info->running_transaction->transid;
- struct tree_entry *entry;
- struct rb_node *node;
struct btrfs_ordered_inode_tree *tree;
+ struct rb_node *node;
+ struct btrfs_ordered_extent *entry;
- if (transid <= BTRFS_I(inode)->ordered_trans)
- return 0;
-
- tree = &root->fs_info->running_transaction->ordered_inode_tree;
-
- read_lock(&tree->lock);
- node = __tree_search(&tree->tree, root_objectid, inode->i_ino, NULL);
- read_unlock(&tree->lock);
- if (node) {
- return 0;
- }
-
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
+ tree = &BTRFS_I(inode)->ordered_tree;
+ entry = kzalloc(sizeof(*entry), GFP_NOFS);
if (!entry)
return -ENOMEM;
- write_lock(&tree->lock);
- entry->objectid = inode->i_ino;
- entry->root_objectid = root_objectid;
+ mutex_lock(&tree->mutex);
+ entry->file_offset = file_offset;
+ entry->start = start;
+ entry->len = len;
entry->inode = inode;
+ /* one ref for the tree */
+ atomic_set(&entry->refs, 1);
+ init_waitqueue_head(&entry->wait);
+ INIT_LIST_HEAD(&entry->list);
- node = tree_insert(&tree->tree, root_objectid,
- inode->i_ino, &entry->rb_node);
-
- BTRFS_I(inode)->ordered_trans = transid;
- if (!node)
- igrab(inode);
-
- write_unlock(&tree->lock);
+ node = tree_insert(&tree->tree, file_offset,
+ &entry->rb_node);
+ if (node) {
+ entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ atomic_inc(&entry->refs);
+ }
+ set_extent_ordered(&BTRFS_I(inode)->io_tree, file_offset,
+ entry_end(entry) - 1, GFP_NOFS);
- if (node)
- kfree(entry);
+ set_bit(BTRFS_ORDERED_START, &entry->flags);
+ mutex_unlock(&tree->mutex);
+ BUG_ON(node);
return 0;
}
-int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
- u64 *root_objectid, u64 *objectid,
- struct inode **inode)
+int btrfs_add_ordered_sum(struct inode *inode, struct btrfs_ordered_sum *sum)
{
- struct tree_entry *entry;
+ struct btrfs_ordered_inode_tree *tree;
struct rb_node *node;
+ struct btrfs_ordered_extent *entry;
- write_lock(&tree->lock);
- node = tree_search(&tree->tree, *root_objectid, *objectid);
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ node = tree_search(tree, sum->file_offset);
if (!node) {
- write_unlock(&tree->lock);
- return 0;
+search_fail:
+printk("add ordered sum failed to find a node for inode %lu offset %Lu\n", inode->i_ino, sum->file_offset);
+ node = rb_first(&tree->tree);
+ while(node) {
+ entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ printk("entry %Lu %Lu %Lu\n", entry->file_offset, entry->file_offset + entry->len, entry->start);
+ node = rb_next(node);
+ }
+ BUG();
}
- entry = rb_entry(node, struct tree_entry, rb_node);
+ BUG_ON(!node);
- while(comp_entry(entry, *root_objectid, *objectid) >= 0) {
- node = rb_next(node);
- if (!node)
- break;
- entry = rb_entry(node, struct tree_entry, rb_node);
- }
- if (!node) {
- write_unlock(&tree->lock);
- return 0;
+ entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ if (!offset_in_entry(entry, sum->file_offset)) {
+ goto search_fail;
}
- *root_objectid = entry->root_objectid;
- *inode = entry->inode;
- atomic_inc(&entry->inode->i_count);
- *objectid = entry->objectid;
- write_unlock(&tree->lock);
- return 1;
+ list_add_tail(&sum->list, &entry->list);
+ mutex_unlock(&tree->mutex);
+ return 0;
}
-int btrfs_find_del_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
- u64 *root_objectid, u64 *objectid,
- struct inode **inode)
+int btrfs_dec_test_ordered_pending(struct inode *inode,
+ u64 file_offset, u64 io_size)
{
- struct tree_entry *entry;
+ struct btrfs_ordered_inode_tree *tree;
struct rb_node *node;
-
- write_lock(&tree->lock);
- node = tree_search(&tree->tree, *root_objectid, *objectid);
+ struct btrfs_ordered_extent *entry;
+ struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+ int ret;
+
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ clear_extent_ordered(io_tree, file_offset, file_offset + io_size - 1,
+ GFP_NOFS);
+ node = tree_search(tree, file_offset);
if (!node) {
- write_unlock(&tree->lock);
- return 0;
+ ret = 1;
+ goto out;
}
- entry = rb_entry(node, struct tree_entry, rb_node);
- while(comp_entry(entry, *root_objectid, *objectid) >= 0) {
- node = rb_next(node);
- if (!node)
- break;
- entry = rb_entry(node, struct tree_entry, rb_node);
+ entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ if (!offset_in_entry(entry, file_offset)) {
+ ret = 1;
+ goto out;
}
- if (!node) {
- write_unlock(&tree->lock);
- return 0;
+
+ ret = test_range_bit(io_tree, entry->file_offset,
+ entry->file_offset + entry->len - 1,
+ EXTENT_ORDERED, 0);
+ if (!test_bit(BTRFS_ORDERED_START, &entry->flags)) {
+printk("inode %lu not ready yet for extent %Lu %Lu\n", inode->i_ino, entry->file_offset, entry_end(entry));
}
+ if (ret == 0)
+ ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
+out:
+ mutex_unlock(&tree->mutex);
+ return ret == 0;
+}
- *root_objectid = entry->root_objectid;
- *objectid = entry->objectid;
- *inode = entry->inode;
- atomic_inc(&entry->inode->i_count);
- rb_erase(node, &tree->tree);
- write_unlock(&tree->lock);
- kfree(entry);
- return 1;
+int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry)
+{
+ if (atomic_dec_and_test(&entry->refs))
+ kfree(entry);
+ return 0;
}
-static void __btrfs_del_ordered_inode(struct btrfs_ordered_inode_tree *tree,
- struct inode *inode,
- u64 root_objectid, u64 objectid)
+int btrfs_remove_ordered_extent(struct inode *inode,
+ struct btrfs_ordered_extent *entry)
{
- struct tree_entry *entry;
+ struct btrfs_ordered_inode_tree *tree;
struct rb_node *node;
- struct rb_node *prev;
- write_lock(&tree->lock);
- node = __tree_search(&tree->tree, root_objectid, objectid, &prev);
- if (!node) {
- write_unlock(&tree->lock);
- return;
- }
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ node = &entry->rb_node;
rb_erase(node, &tree->tree);
- BTRFS_I(inode)->ordered_trans = 0;
- write_unlock(&tree->lock);
- atomic_dec(&inode->i_count);
- entry = rb_entry(node, struct tree_entry, rb_node);
- kfree(entry);
- return;
+ tree->last = NULL;
+ set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags);
+ mutex_unlock(&tree->mutex);
+ wake_up(&entry->wait);
+ return 0;
}
-void btrfs_del_ordered_inode(struct inode *inode, int force)
+void btrfs_wait_ordered_extent(struct inode *inode,
+ struct btrfs_ordered_extent *entry)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 root_objectid = root->root_key.objectid;
+ u64 start = entry->file_offset;
+ u64 end = start + entry->len - 1;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
+ do_sync_file_range(file, start, end, SYNC_FILE_RANGE_WRITE);
+#else
+ do_sync_mapping_range(inode->i_mapping, start, end,
+ SYNC_FILE_RANGE_WRITE);
+#endif
+ wait_event(entry->wait,
+ test_bit(BTRFS_ORDERED_COMPLETE, &entry->flags));
+}
- if (!BTRFS_I(inode)->ordered_trans) {
- return;
- }
+static void btrfs_start_ordered_extent(struct inode *inode,
+ struct btrfs_ordered_extent *entry, int wait)
+{
+ u64 start = entry->file_offset;
+ u64 end = start + entry->len - 1;
- if (!force && (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
- mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)))
- return;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
+ do_sync_file_range(file, start, end, SYNC_FILE_RANGE_WRITE);
+#else
+ do_sync_mapping_range(inode->i_mapping, start, end,
+ SYNC_FILE_RANGE_WRITE);
+#endif
+ if (wait)
+ wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
+ &entry->flags));
+}
- spin_lock(&root->fs_info->new_trans_lock);
- if (root->fs_info->running_transaction) {
- struct btrfs_ordered_inode_tree *tree;
- tree = &root->fs_info->running_transaction->ordered_inode_tree;
- __btrfs_del_ordered_inode(tree, inode, root_objectid,
- inode->i_ino);
+void btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
+{
+ u64 end;
+ struct btrfs_ordered_extent *ordered;
+ int found;
+ int should_wait = 0;
+
+again:
+ if (start + len < start)
+ end = (u64)-1;
+ else
+ end = start + len - 1;
+ found = 0;
+ while(1) {
+ ordered = btrfs_lookup_first_ordered_extent(inode, end);
+ if (!ordered) {
+ break;
+ }
+ if (ordered->file_offset >= start + len) {
+ btrfs_put_ordered_extent(ordered);
+ break;
+ }
+ if (ordered->file_offset + ordered->len < start) {
+ btrfs_put_ordered_extent(ordered);
+ break;
+ }
+ btrfs_start_ordered_extent(inode, ordered, should_wait);
+ found++;
+ end = ordered->file_offset;
+ btrfs_put_ordered_extent(ordered);
+ if (end == 0)
+ break;
+ end--;
+ }
+ if (should_wait && found) {
+ should_wait = 0;
+ goto again;
}
- spin_unlock(&root->fs_info->new_trans_lock);
}
-int btrfs_ordered_throttle(struct btrfs_root *root, struct inode *inode)
+int btrfs_add_ordered_pending(struct inode *inode,
+ struct btrfs_ordered_extent *ordered,
+ u64 start, u64 len)
{
- struct btrfs_transaction *cur = root->fs_info->running_transaction;
- while(cur == root->fs_info->running_transaction &&
- atomic_read(&BTRFS_I(inode)->ordered_writeback)) {
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
- congestion_wait(WRITE, HZ/20);
-#else
- blk_congestion_wait(WRITE, HZ/20);
-#endif
- }
+ WARN_ON(1);
return 0;
+#if 0
+ int ret;
+ struct btrfs_ordered_inode_tree *tree;
+ struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ if (test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags)) {
+ ret = -EAGAIN;
+ goto out;
+ }
+ set_extent_ordered(io_tree, start, start + len - 1, GFP_NOFS);
+ ret = 0;
+out:
+ mutex_unlock(&tree->mutex);
+ return ret;
+#endif
+}
+
+struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
+ u64 file_offset)
+{
+ struct btrfs_ordered_inode_tree *tree;
+ struct rb_node *node;
+ struct btrfs_ordered_extent *entry = NULL;
+
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ node = tree_search(tree, file_offset);
+ if (!node)
+ goto out;
+
+ entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ if (!offset_in_entry(entry, file_offset))
+ entry = NULL;
+ if (entry)
+ atomic_inc(&entry->refs);
+out:
+ mutex_unlock(&tree->mutex);
+ return entry;
+}
+
+struct btrfs_ordered_extent *
+btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset)
+{
+ struct btrfs_ordered_inode_tree *tree;
+ struct rb_node *node;
+ struct btrfs_ordered_extent *entry = NULL;
+
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ node = tree_search(tree, file_offset);
+ if (!node)
+ goto out;
+
+ entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ atomic_inc(&entry->refs);
+out:
+ mutex_unlock(&tree->mutex);
+ return entry;
}
projects / linux-2.6-block.git / blobdiff