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Btrfs: extent_map and data=ordered fixes for space balancing

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* Add an EXTENT_BOUNDARY state bit to keep the writepage code
from merging data extents that are in the process of being
relocated.  This allows us to do accounting for them properly.

* The balancing code relocates data extents indepdent of the underlying
inode.  The extent_map code was modified to properly account for
things moving around (invalidating extent_map caches in the inode).

* Don't take the drop_mutex in the create_subvol ioctl.  It isn't
required.

* Fix walking of the ordered extent list to avoid races with sys_unlink

* Change the lock ordering rules.  Transaction start goes outside
the drop_mutex.  This allows btrfs_commit_transaction to directly
drop the relocation trees.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Zheng Yan
2008-09-26 10:05:38 -04:00
committed by Chris Mason
parent e465768938
commit 5b21f2ed3f
10 changed files with 108 additions and 49 deletions
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26
fs/btrfs/ordered-data.c
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@ -309,7 +309,6 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only)
{
struct list_head splice;
struct list_head *cur;
struct list_head *tmp;
struct btrfs_ordered_extent *ordered;
struct inode *inode;
@ -317,37 +316,38 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only)
spin_lock(&root->fs_info->ordered_extent_lock);
list_splice_init(&root->fs_info->ordered_extents, &splice);
list_for_each_safe(cur, tmp, &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)) {
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);
inode = ordered->inode;
/*
* the inode can't go away until all the pages are gone
* and the pages won't go away while there is still
* an ordered extent and the ordered extent won't go
* away until it is off this list. So, we can safely
* increment i_count here and call iput later
* the inode may be getting freed (in sys_unlink path).
*/
atomic_inc(&inode->i_count);
inode = igrab(ordered->inode);
spin_unlock(&root->fs_info->ordered_extent_lock);
btrfs_start_ordered_extent(inode, ordered, 1);
btrfs_put_ordered_extent(ordered);
iput(inode);
if (inode) {
btrfs_start_ordered_extent(inode, ordered, 1);
btrfs_put_ordered_extent(ordered);
iput(inode);
} else {
btrfs_put_ordered_extent(ordered);
}
spin_lock(&root->fs_info->ordered_extent_lock);
}
list_splice_init(&splice, &root->fs_info->ordered_extents);
spin_unlock(&root->fs_info->ordered_extent_lock);
return 0;
}