#include <linux/gfp.h>
#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/writeback.h>
+#include <linux/pagevec.h>
#include "ctree.h"
#include "transaction.h"
#include "btrfs_inode.h"
+#include "extent_io.h"
-struct tree_entry {
- u64 root_objectid;
- u64 objectid;
- 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)
+/* returns NULL if the insertion worked, or it returns the node it did find
+ * in the tree
+ */
+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 rb_node **p = &root->rb_node;
+ struct rb_node *parent = NULL;
+ struct btrfs_ordered_extent *entry;
- while(*p) {
+ 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)
+/*
+ * look for a given offset in the tree, and if it can't be found return the
+ * first lesser offset
+ */
+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 *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);
+ while (n) {
+ 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)
+/*
+ * helper to check if a given offset is inside a given entry
+ */
+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;
+}
+
+/*
+ * look find the first ordered struct that has this offset, otherwise
+ * the first one less than this offset
+ */
+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)
+/* allocate and add a new ordered_extent into the per-inode tree.
+ * file_offset is the logical offset in the file
+ *
+ * start is the disk block number of an extent already reserved in the
+ * extent allocation tree
+ *
+ * len is the length of the extent
+ *
+ * The tree is given a single reference on the ordered extent that was
+ * inserted.
+ */
+int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
+ u64 start, u64 len, u64 disk_len, int type)
{
- 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;
-
- node = tree_insert(&tree->tree, root_objectid,
- inode->i_ino, &entry->rb_node);
+ mutex_lock(&tree->mutex);
+ entry->file_offset = file_offset;
+ entry->start = start;
+ entry->len = len;
+ entry->disk_len = disk_len;
+ entry->bytes_left = len;
+ entry->inode = inode;
+ if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
+ set_bit(type, &entry->flags);
+
+ /* one ref for the tree */
+ atomic_set(&entry->refs, 1);
+ init_waitqueue_head(&entry->wait);
+ INIT_LIST_HEAD(&entry->list);
+ INIT_LIST_HEAD(&entry->root_extent_list);
+
+ node = tree_insert(&tree->tree, file_offset,
+ &entry->rb_node);
+ BUG_ON(node);
+
+ spin_lock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
+ list_add_tail(&entry->root_extent_list,
+ &BTRFS_I(inode)->root->fs_info->ordered_extents);
+ spin_unlock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
+
+ mutex_unlock(&tree->mutex);
+ BUG_ON(node);
+ return 0;
+}
- BTRFS_I(inode)->ordered_trans = transid;
+/*
+ * Add a struct btrfs_ordered_sum into the list of checksums to be inserted
+ * when an ordered extent is finished. If the list covers more than one
+ * ordered extent, it is split across multiples.
+ */
+int btrfs_add_ordered_sum(struct inode *inode,
+ struct btrfs_ordered_extent *entry,
+ struct btrfs_ordered_sum *sum)
+{
+ struct btrfs_ordered_inode_tree *tree;
- write_unlock(&tree->lock);
- if (node)
- kfree(entry);
- else
- igrab(inode);
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ list_add_tail(&sum->list, &entry->list);
+ mutex_unlock(&tree->mutex);
return 0;
}
-int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
- u64 *root_objectid, u64 *objectid)
+/*
+ * this is used to account for finished IO across a given range
+ * of the file. The IO should not span ordered extents. If
+ * a given ordered_extent is completely done, 1 is returned, otherwise
+ * 0.
+ *
+ * test_and_set_bit on a flag in the struct btrfs_ordered_extent is used
+ * to make sure this function only returns 1 once for a given ordered extent.
+ */
+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;
+ struct btrfs_ordered_extent *entry;
+ int ret;
- 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, 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;
+
+ if (io_size > entry->bytes_left) {
+ printk(KERN_CRIT "bad ordered accounting left %llu size %llu\n",
+ (unsigned long long)entry->bytes_left,
+ (unsigned long long)io_size);
}
+ entry->bytes_left -= io_size;
+ if (entry->bytes_left == 0)
+ ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
+ else
+ ret = 1;
+out:
+ mutex_unlock(&tree->mutex);
+ return ret == 0;
+}
- *root_objectid = entry->root_objectid;
- *objectid = entry->objectid;
- write_unlock(&tree->lock);
- return 1;
+/*
+ * used to drop a reference on an ordered extent. This will free
+ * the extent if the last reference is dropped
+ */
+int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry)
+{
+ struct list_head *cur;
+ struct btrfs_ordered_sum *sum;
+
+ if (atomic_dec_and_test(&entry->refs)) {
+ while (!list_empty(&entry->list)) {
+ cur = entry->list.next;
+ sum = list_entry(cur, struct btrfs_ordered_sum, list);
+ list_del(&sum->list);
+ kfree(sum);
+ }
+ kfree(entry);
+ }
+ return 0;
}
-int btrfs_find_del_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
- u64 *root_objectid, u64 *objectid)
+/*
+ * remove an ordered extent from the tree. No references are dropped
+ * and you must wake_up entry->wait. You must hold the tree mutex
+ * while you call this function.
+ */
+static 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;
- write_lock(&tree->lock);
- node = tree_search(&tree->tree, *root_objectid, *objectid);
- if (!node) {
- write_unlock(&tree->lock);
- return 0;
+ tree = &BTRFS_I(inode)->ordered_tree;
+ node = &entry->rb_node;
+ rb_erase(node, &tree->tree);
+ tree->last = NULL;
+ set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags);
+
+ spin_lock(&BTRFS_I(inode)->accounting_lock);
+ BTRFS_I(inode)->outstanding_extents--;
+ spin_unlock(&BTRFS_I(inode)->accounting_lock);
+ btrfs_unreserve_metadata_for_delalloc(BTRFS_I(inode)->root,
+ inode, 1);
+
+ spin_lock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
+ list_del_init(&entry->root_extent_list);
+
+ /*
+ * we have no more ordered extents for this inode and
+ * no dirty pages. We can safely remove it from the
+ * list of ordered extents
+ */
+ if (RB_EMPTY_ROOT(&tree->tree) &&
+ !mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY)) {
+ list_del_init(&BTRFS_I(inode)->ordered_operations);
+ }
+ spin_unlock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
+
+ return 0;
+}
+
+/*
+ * remove an ordered extent from the tree. No references are dropped
+ * but any waiters are woken.
+ */
+int btrfs_remove_ordered_extent(struct inode *inode,
+ struct btrfs_ordered_extent *entry)
+{
+ struct btrfs_ordered_inode_tree *tree;
+ int ret;
+
+ tree = &BTRFS_I(inode)->ordered_tree;
+ mutex_lock(&tree->mutex);
+ ret = __btrfs_remove_ordered_extent(inode, entry);
+ mutex_unlock(&tree->mutex);
+ wake_up(&entry->wait);
+
+ return ret;
+}
+
+/*
+ * wait for all the ordered extents in a root. This is done when balancing
+ * space between drives.
+ */
+int btrfs_wait_ordered_extents(struct btrfs_root *root,
+ int nocow_only, int delay_iput)
+{
+ struct list_head splice;
+ struct list_head *cur;
+ struct btrfs_ordered_extent *ordered;
+ struct inode *inode;
+
+ INIT_LIST_HEAD(&splice);
+
+ spin_lock(&root->fs_info->ordered_extent_lock);
+ list_splice_init(&root->fs_info->ordered_extents, &splice);
+ while (!list_empty(&splice)) {
+ cur = splice.next;
+ ordered = list_entry(cur, struct btrfs_ordered_extent,
+ root_extent_list);
+ if (nocow_only &&
+ !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) &&
+ !test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) {
+ list_move(&ordered->root_extent_list,
+ &root->fs_info->ordered_extents);
+ cond_resched_lock(&root->fs_info->ordered_extent_lock);
+ continue;
+ }
+
+ list_del_init(&ordered->root_extent_list);
+ atomic_inc(&ordered->refs);
+
+ /*
+ * the inode may be getting freed (in sys_unlink path).
+ */
+ inode = igrab(ordered->inode);
+
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+
+ if (inode) {
+ btrfs_start_ordered_extent(inode, ordered, 1);
+ btrfs_put_ordered_extent(ordered);
+ if (delay_iput)
+ btrfs_add_delayed_iput(inode);
+ else
+ iput(inode);
+ } else {
+ btrfs_put_ordered_extent(ordered);
+ }
+
+ spin_lock(&root->fs_info->ordered_extent_lock);
+ }
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+ return 0;
+}
+
+/*
+ * this is used during transaction commit to write all the inodes
+ * added to the ordered operation list. These files must be fully on
+ * disk before the transaction commits.
+ *
+ * we have two modes here, one is to just start the IO via filemap_flush
+ * and the other is to wait for all the io. When we wait, we have an
+ * extra check to make sure the ordered operation list really is empty
+ * before we return
+ */
+int btrfs_run_ordered_operations(struct btrfs_root *root, int wait)
+{
+ struct btrfs_inode *btrfs_inode;
+ struct inode *inode;
+ struct list_head splice;
+
+ INIT_LIST_HEAD(&splice);
+
+ mutex_lock(&root->fs_info->ordered_operations_mutex);
+ spin_lock(&root->fs_info->ordered_extent_lock);
+again:
+ list_splice_init(&root->fs_info->ordered_operations, &splice);
+
+ while (!list_empty(&splice)) {
+ btrfs_inode = list_entry(splice.next, struct btrfs_inode,
+ ordered_operations);
+
+ inode = &btrfs_inode->vfs_inode;
+
+ list_del_init(&btrfs_inode->ordered_operations);
+
+ /*
+ * the inode may be getting freed (in sys_unlink path).
+ */
+ inode = igrab(inode);
+
+ if (!wait && inode) {
+ list_add_tail(&BTRFS_I(inode)->ordered_operations,
+ &root->fs_info->ordered_operations);
+ }
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+
+ if (inode) {
+ if (wait)
+ btrfs_wait_ordered_range(inode, 0, (u64)-1);
+ else
+ filemap_flush(inode->i_mapping);
+ btrfs_add_delayed_iput(inode);
+ }
+
+ cond_resched();
+ spin_lock(&root->fs_info->ordered_extent_lock);
}
+ if (wait && !list_empty(&root->fs_info->ordered_operations))
+ goto again;
- entry = rb_entry(node, struct tree_entry, rb_node);
- while(comp_entry(entry, *root_objectid, *objectid) >= 0) {
- node = rb_next(node);
- if (!node)
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+ mutex_unlock(&root->fs_info->ordered_operations_mutex);
+
+ return 0;
+}
+
+/*
+ * Used to start IO or wait for a given ordered extent to finish.
+ *
+ * If wait is one, this effectively waits on page writeback for all the pages
+ * in the extent, and it waits on the io completion code to insert
+ * metadata into the btree corresponding to the extent
+ */
+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;
+
+ /*
+ * pages in the range can be dirty, clean or writeback. We
+ * start IO on any dirty ones so the wait doesn't stall waiting
+ * for pdflush to find them
+ */
+ filemap_fdatawrite_range(inode->i_mapping, start, end);
+ if (wait) {
+ wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
+ &entry->flags));
+ }
+}
+
+/*
+ * Used to wait on ordered extents across a large range of bytes.
+ */
+int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
+{
+ u64 end;
+ u64 orig_end;
+ u64 wait_end;
+ struct btrfs_ordered_extent *ordered;
+ int found;
+
+ if (start + len < start) {
+ orig_end = INT_LIMIT(loff_t);
+ } else {
+ orig_end = start + len - 1;
+ if (orig_end > INT_LIMIT(loff_t))
+ orig_end = INT_LIMIT(loff_t);
+ }
+ wait_end = orig_end;
+again:
+ /* start IO across the range first to instantiate any delalloc
+ * extents
+ */
+ filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
+
+ /* The compression code will leave pages locked but return from
+ * writepage without setting the page writeback. Starting again
+ * with WB_SYNC_ALL will end up waiting for the IO to actually start.
+ */
+ filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
+
+ filemap_fdatawait_range(inode->i_mapping, start, orig_end);
+
+ end = orig_end;
+ found = 0;
+ while (1) {
+ ordered = btrfs_lookup_first_ordered_extent(inode, end);
+ if (!ordered)
+ break;
+ if (ordered->file_offset > orig_end) {
+ btrfs_put_ordered_extent(ordered);
+ break;
+ }
+ if (ordered->file_offset + ordered->len < start) {
+ btrfs_put_ordered_extent(ordered);
break;
- entry = rb_entry(node, struct tree_entry, rb_node);
+ }
+ found++;
+ btrfs_start_ordered_extent(inode, ordered, 1);
+ end = ordered->file_offset;
+ btrfs_put_ordered_extent(ordered);
+ if (end == 0 || end == start)
+ break;
+ end--;
}
- if (!node) {
- write_unlock(&tree->lock);
- return 0;
+ if (found || test_range_bit(&BTRFS_I(inode)->io_tree, start, orig_end,
+ EXTENT_DELALLOC, 0, NULL)) {
+ schedule_timeout(1);
+ goto again;
}
+ return 0;
+}
- *root_objectid = entry->root_objectid;
- *objectid = entry->objectid;
- rb_erase(node, &tree->tree);
- write_unlock(&tree->lock);
- kfree(entry);
- return 1;
+/*
+ * find an ordered extent corresponding to file_offset. return NULL if
+ * nothing is found, otherwise take a reference on the extent and return it
+ */
+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;
}
-static int __btrfs_del_ordered_inode(struct btrfs_ordered_inode_tree *tree,
- struct inode *inode,
- u64 root_objectid, u64 objectid)
+/*
+ * lookup and return any extent before 'file_offset'. NULL is returned
+ * if none is found
+ */
+struct btrfs_ordered_extent *
+btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset)
{
- struct tree_entry *entry;
+ struct btrfs_ordered_inode_tree *tree;
struct rb_node *node;
- struct rb_node *prev;
+ 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;
+}
- write_lock(&tree->lock);
- node = __tree_search(&tree->tree, root_objectid, objectid, &prev);
- if (!node) {
- write_unlock(&tree->lock);
- return 0;
+/*
+ * After an extent is done, call this to conditionally update the on disk
+ * i_size. i_size is updated to cover any fully written part of the file.
+ */
+int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
+ struct btrfs_ordered_extent *ordered)
+{
+ struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
+ struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+ u64 disk_i_size;
+ u64 new_i_size;
+ u64 i_size_test;
+ u64 i_size = i_size_read(inode);
+ struct rb_node *node;
+ struct rb_node *prev = NULL;
+ struct btrfs_ordered_extent *test;
+ int ret = 1;
+
+ if (ordered)
+ offset = entry_end(ordered);
+ else
+ offset = ALIGN(offset, BTRFS_I(inode)->root->sectorsize);
+
+ mutex_lock(&tree->mutex);
+ disk_i_size = BTRFS_I(inode)->disk_i_size;
+
+ /* truncate file */
+ if (disk_i_size > i_size) {
+ BTRFS_I(inode)->disk_i_size = i_size;
+ ret = 0;
+ goto out;
}
- rb_erase(node, &tree->tree);
- BTRFS_I(inode)->ordered_trans = 0;
- write_unlock(&tree->lock);
- entry = rb_entry(node, struct tree_entry, rb_node);
- kfree(entry);
- return 1;
+
+ /*
+ * if the disk i_size is already at the inode->i_size, or
+ * this ordered extent is inside the disk i_size, we're done
+ */
+ if (disk_i_size == i_size || offset <= disk_i_size) {
+ goto out;
+ }
+
+ /*
+ * we can't update the disk_isize if there are delalloc bytes
+ * between disk_i_size and this ordered extent
+ */
+ if (test_range_bit(io_tree, disk_i_size, offset - 1,
+ EXTENT_DELALLOC, 0, NULL)) {
+ goto out;
+ }
+ /*
+ * walk backward from this ordered extent to disk_i_size.
+ * if we find an ordered extent then we can't update disk i_size
+ * yet
+ */
+ if (ordered) {
+ node = rb_prev(&ordered->rb_node);
+ } else {
+ prev = tree_search(tree, offset);
+ /*
+ * we insert file extents without involving ordered struct,
+ * so there should be no ordered struct cover this offset
+ */
+ if (prev) {
+ test = rb_entry(prev, struct btrfs_ordered_extent,
+ rb_node);
+ BUG_ON(offset_in_entry(test, offset));
+ }
+ node = prev;
+ }
+ while (node) {
+ test = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ if (test->file_offset + test->len <= disk_i_size)
+ break;
+ if (test->file_offset >= i_size)
+ break;
+ if (test->file_offset >= disk_i_size)
+ goto out;
+ node = rb_prev(node);
+ }
+ new_i_size = min_t(u64, offset, i_size);
+
+ /*
+ * at this point, we know we can safely update i_size to at least
+ * the offset from this ordered extent. But, we need to
+ * walk forward and see if ios from higher up in the file have
+ * finished.
+ */
+ if (ordered) {
+ node = rb_next(&ordered->rb_node);
+ } else {
+ if (prev)
+ node = rb_next(prev);
+ else
+ node = rb_first(&tree->tree);
+ }
+ i_size_test = 0;
+ if (node) {
+ /*
+ * do we have an area where IO might have finished
+ * between our ordered extent and the next one.
+ */
+ test = rb_entry(node, struct btrfs_ordered_extent, rb_node);
+ if (test->file_offset > offset)
+ i_size_test = test->file_offset;
+ } else {
+ i_size_test = i_size;
+ }
+
+ /*
+ * i_size_test is the end of a region after this ordered
+ * extent where there are no ordered extents. As long as there
+ * are no delalloc bytes in this area, it is safe to update
+ * disk_i_size to the end of the region.
+ */
+ if (i_size_test > offset &&
+ !test_range_bit(io_tree, offset, i_size_test - 1,
+ EXTENT_DELALLOC, 0, NULL)) {
+ new_i_size = min_t(u64, i_size_test, i_size);
+ }
+ BTRFS_I(inode)->disk_i_size = new_i_size;
+ ret = 0;
+out:
+ /*
+ * we need to remove the ordered extent with the tree lock held
+ * so that other people calling this function don't find our fully
+ * processed ordered entry and skip updating the i_size
+ */
+ if (ordered)
+ __btrfs_remove_ordered_extent(inode, ordered);
+ mutex_unlock(&tree->mutex);
+ if (ordered)
+ wake_up(&ordered->wait);
+ return ret;
}
-int btrfs_del_ordered_inode(struct inode *inode)
+/*
+ * search the ordered extents for one corresponding to 'offset' and
+ * try to find a checksum. This is used because we allow pages to
+ * be reclaimed before their checksum is actually put into the btree
+ */
+int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
+ u32 *sum)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 root_objectid = root->root_key.objectid;
- int ret = 0;
-
- 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;
- ret = __btrfs_del_ordered_inode(tree, inode, root_objectid,
- inode->i_ino);
+ struct btrfs_ordered_sum *ordered_sum;
+ struct btrfs_sector_sum *sector_sums;
+ struct btrfs_ordered_extent *ordered;
+ struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
+ unsigned long num_sectors;
+ unsigned long i;
+ u32 sectorsize = BTRFS_I(inode)->root->sectorsize;
+ int ret = 1;
+
+ ordered = btrfs_lookup_ordered_extent(inode, offset);
+ if (!ordered)
+ return 1;
+
+ mutex_lock(&tree->mutex);
+ list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
+ if (disk_bytenr >= ordered_sum->bytenr) {
+ num_sectors = ordered_sum->len / sectorsize;
+ sector_sums = ordered_sum->sums;
+ for (i = 0; i < num_sectors; i++) {
+ if (sector_sums[i].bytenr == disk_bytenr) {
+ *sum = sector_sums[i].sum;
+ ret = 0;
+ goto out;
+ }
+ }
+ }
}
- spin_unlock(&root->fs_info->new_trans_lock);
+out:
+ mutex_unlock(&tree->mutex);
+ btrfs_put_ordered_extent(ordered);
return ret;
}
+
+/*
+ * add a given inode to the list of inodes that must be fully on
+ * disk before a transaction commit finishes.
+ *
+ * This basically gives us the ext3 style data=ordered mode, and it is mostly
+ * used to make sure renamed files are fully on disk.
+ *
+ * It is a noop if the inode is already fully on disk.
+ *
+ * If trans is not null, we'll do a friendly check for a transaction that
+ * is already flushing things and force the IO down ourselves.
+ */
+int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode)
+{
+ u64 last_mod;
+
+ last_mod = max(BTRFS_I(inode)->generation, BTRFS_I(inode)->last_trans);
+
+ /*
+ * if this file hasn't been changed since the last transaction
+ * commit, we can safely return without doing anything
+ */
+ if (last_mod < root->fs_info->last_trans_committed)
+ return 0;
+
+ /*
+ * the transaction is already committing. Just start the IO and
+ * don't bother with all of this list nonsense
+ */
+ if (trans && root->fs_info->running_transaction->blocked) {
+ btrfs_wait_ordered_range(inode, 0, (u64)-1);
+ return 0;
+ }
+
+ spin_lock(&root->fs_info->ordered_extent_lock);
+ if (list_empty(&BTRFS_I(inode)->ordered_operations)) {
+ list_add_tail(&BTRFS_I(inode)->ordered_operations,
+ &root->fs_info->ordered_operations);
+ }
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+
+ return 0;
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff