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Btrfs: Update metadata reservation for delayed allocation

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Introduce metadata reservation context for delayed allocation
and update various related functions.

This patch also introduces EXTENT_FIRST_DELALLOC control bit for
set/clear_extent_bit. It tells set/clear_bit_hook whether they
are processing the first extent_state with EXTENT_DELALLOC bit
set. This change is important if set/clear_extent_bit involves
multiple extent_state.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng
2010-05-16 10:48:47 -04:00
committed by Chris Mason
parent a22285a6a3
commit 0ca1f7ceb1
9 changed files with 232 additions and 415 deletions
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29
fs/btrfs/ioctl.c
View File

@@ -587,19 +587,9 @@ static int btrfs_defrag_file(struct file *file,
if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
BTRFS_I(inode)->force_compress = 1;
ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE);
if (ret) {
ret = -ENOSPC;
break;
}
ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
if (ret) {
btrfs_free_reserved_data_space(root, inode,
PAGE_CACHE_SIZE);
ret = -ENOSPC;
break;
}
ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
if (ret)
goto err_unlock;
again:
if (inode->i_size == 0 ||
i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) {
@@ -608,8 +598,10 @@ again:
}
page = grab_cache_page(inode->i_mapping, i);
if (!page)
if (!page) {
ret = -ENOMEM;
goto err_reservations;
}
if (!PageUptodate(page)) {
btrfs_readpage(NULL, page);
@@ -617,6 +609,7 @@ again:
if (!PageUptodate(page)) {
unlock_page(page);
page_cache_release(page);
ret = -EIO;
goto err_reservations;
}
}
@@ -630,8 +623,7 @@ again:
wait_on_page_writeback(page);
if (PageDirty(page)) {
btrfs_free_reserved_data_space(root, inode,
PAGE_CACHE_SIZE);
btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
goto loop_unlock;
}
@@ -669,7 +661,6 @@ loop_unlock:
page_cache_release(page);
mutex_unlock(&inode->i_mutex);
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
i++;
}
@@ -699,9 +690,9 @@ loop_unlock:
return 0;
err_reservations:
btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
err_unlock:
mutex_unlock(&inode->i_mutex);
btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
return ret;
}