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ocfs2: Add CoW support.

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This patch try CoW support for a refcounted record.

the whole process will be:
1. Calculate how many clusters we need to CoW and where we start.
   Extents that are not completely encompassed by the write will
   be broken on 1MB boundaries.
2. Do CoW for the clusters with the help of page cache.
3. Change the b-tree structure with the new allocated clusters.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma
2009-08-25 08:05:12 +08:00
committed by Joel Becker
parent bcbbb24a6a
commit 6f70fa5199
6 changed files with 841 additions and 11 deletions
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25
fs/ocfs2/alloc.c
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@@ -6998,9 +6998,9 @@ static int ocfs2_zero_func(handle_t *handle, struct buffer_head *bh)
return 0;
}
static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
unsigned int from, unsigned int to,
struct page *page, int zero, u64 *phys)
void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
unsigned int from, unsigned int to,
struct page *page, int zero, u64 *phys)
{
int ret, partial = 0;
@@ -7068,20 +7068,16 @@ out:
ocfs2_unlock_and_free_pages(pages, numpages);
}
static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
struct page **pages, int *num)
int ocfs2_grab_pages(struct inode *inode, loff_t start, loff_t end,
struct page **pages, int *num)
{
int numpages, ret = 0;
struct super_block *sb = inode->i_sb;
struct address_space *mapping = inode->i_mapping;
unsigned long index;
loff_t last_page_bytes;
BUG_ON(start > end);
BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits !=
(end - 1) >> OCFS2_SB(sb)->s_clustersize_bits);
numpages = 0;
last_page_bytes = PAGE_ALIGN(end);
index = start >> PAGE_CACHE_SHIFT;
@@ -7109,6 +7105,17 @@ out:
return ret;
}
static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
struct page **pages, int *num)
{
struct super_block *sb = inode->i_sb;
BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits !=
(end - 1) >> OCFS2_SB(sb)->s_clustersize_bits);
return ocfs2_grab_pages(inode, start, end, pages, num);
}
/*
* Zero the area past i_size but still within an allocated
* cluster. This avoids exposing nonzero data on subsequent file