ext4: delalloc block reservation unlink/truncate handling
From: Mingming cao <cmm@xxxxxxxxxx>
Release reserved blocks for unlink/truncate/invalidate page
Signed-off-by: Mingming cao <cmm@xxxxxxxxxx>
---
fs/ext4/inode.c | 40 ++++++++++++++++++++++------------------
1 file changed, 22 insertions(+), 18 deletions(-)
Index: linux-2.6.26-rc4/fs/ext4/inode.c
===================================================================
--- linux-2.6.26-rc4.orig/fs/ext4/inode.c 2008-06-01 15:04:14.000000000 -0700
+++ linux-2.6.26-rc4/fs/ext4/inode.c 2008-06-01 15:04:21.000000000 -0700
@@ -1477,6 +1477,27 @@ void ext4_da_release_space(struct inode
EXT4_I(inode)->i_reserved_meta_blocks -= mdb;
}
+static void ext4_da_page_release_reservation(struct page *page,
+ unsigned long offset)
+{
+ int to_release = 0;
+ struct buffer_head *head, *bh;
+ unsigned int curr_off = 0;
+
+ head = page_buffers(page);
+ bh = head;
+ do {
+ unsigned int next_off = curr_off + bh->b_size;
+
+ if ((offset <= curr_off) && (buffer_delay(bh))) {
+ to_release++;
+ clear_buffer_delay(bh);
+ }
+ curr_off = next_off;
+ } while ((bh = bh->b_this_page) != head);
+ ext4_da_release_space(page->mapping->host, 0, to_release);
+}
+
/*
* this is a special callback for ->write_begin() only
* it's intention is to return mapped block or reserve space
@@ -1737,9 +1758,6 @@ static int ext4_da_write_begin(struct fi
static void ext4_da_invalidatepage(struct page *page, unsigned long offset)
{
- struct buffer_head *head, *bh;
- unsigned int curr_off = 0;
-
/*
* Drop reserved blocks
*/
@@ -1747,21 +1765,7 @@ static void ext4_da_invalidatepage(struc
if (!page_has_buffers(page))
goto out;
- head = page_buffers(page);
- bh = head;
- do {
- unsigned int next_off = curr_off + bh->b_size;
-
- /*
- * is this block fully invalidated?
- */
- if (offset <= curr_off && buffer_delay(bh)) {
- clear_buffer_delay(bh);
- /* XXX: add real stuff here */
- }
- curr_off = next_off;
- bh = bh->b_this_page;
- } while (bh != head);
+ ext4_da_page_release_reservation(page, offset);
out:
ext4_invalidatepage(page, offset);
--
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