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Btrfs: try to drop dead cow pages from ram

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-04-28 08:48:10 -04:00 committed by David Woodhouse
parent 28b8bb9e00
commit 06a2f9fa4c
2 changed files with 18 additions and 2 deletions
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3
fs/btrfs/TODO
View File

@ -6,8 +6,7 @@
* Check compat and incompat flags on the inode
* Get rid of struct ctree_path, limiting tree levels held at one time
* Add generation number to key pointer in nodes
* Add parent pointer back to extent map.
* Implement real list of pending transactions
* Add generation number to inode
* Release
* Do real tree locking
* Add extent mirroring (backup copies of blocks)

17
fs/btrfs/extent-tree.c
View File

@ -291,10 +291,18 @@ static int update_block_group(struct btrfs_trans_handle *trans,
return 0;
}
static int try_remove_page(struct address_space *mapping, unsigned long index)
{
int ret;
ret = invalidate_mapping_pages(mapping, index, index);
return ret;
}
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
btrfs_root *root)
{
unsigned long gang[8];
struct inode *btree_inode = root->fs_info->btree_inode;
u64 first = 0;
int ret;
int i;
@ -309,6 +317,9 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
first = gang[0];
for (i = 0; i < ret; i++) {
clear_radix_bit(pinned_radix, gang[i]);
try_remove_page(btree_inode->i_mapping,
gang[i] << (PAGE_CACHE_SHIFT -
btree_inode->i_blkbits));
}
}
if (root->fs_info->block_group_cache) {
@ -600,6 +611,12 @@ check_pending:
*/
btrfs_release_path(root, path);
BUG_ON(ins->objectid < search_start);
if (ins->objectid >= btrfs_super_total_blocks(info->disk_super)) {
if (search_start == 0)
return -ENOSPC;
search_start = 0;
goto check_failed;
}
for (test_block = ins->objectid;
test_block < ins->objectid + num_blocks; test_block++) {
if (test_radix_bit(&info->pinned_radix, test_block)) {