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ext4: add journalled write support for inline data 

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Tao Ma 2012-12-10 14:05:57 -05:00 committed by Theodore Ts'o
parent f19d5870cb
commit 3fdcfb668f
3 changed files with 85 additions and 20 deletions
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24
fs/ext4/inline.c
View File

@ -747,6 +747,30 @@ int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
return copied;
}
struct buffer_head *
ext4_journalled_write_inline_data(struct inode *inode,
unsigned len,
struct page *page)
{
int ret;
void *kaddr;
struct ext4_iloc iloc;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret) {
ext4_std_error(inode->i_sb, ret);
return NULL;
}
down_write(&EXT4_I(inode)->xattr_sem);
kaddr = kmap_atomic(page);
ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
kunmap_atomic(kaddr);
up_write(&EXT4_I(inode)->xattr_sem);
return iloc.bh;
}
int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
{

69
fs/ext4/inode.c
View File

@ -1124,16 +1124,21 @@ static int ext4_journalled_write_end(struct file *file,
BUG_ON(!ext4_handle_valid(handle));
if (copied < len) {
if (!PageUptodate(page))
copied = 0;
page_zero_new_buffers(page, from+copied, to);
}
if (ext4_has_inline_data(inode))
copied = ext4_write_inline_data_end(inode, pos, len,
copied, page);
else {
if (copied < len) {
if (!PageUptodate(page))
copied = 0;
page_zero_new_buffers(page, from+copied, to);
}
ret = ext4_walk_page_buffers(handle, page_buffers(page), from,
to, &partial, write_end_fn);
if (!partial)
SetPageUptodate(page);
ret = ext4_walk_page_buffers(handle, page_buffers(page), from,
to, &partial, write_end_fn);
if (!partial)
SetPageUptodate(page);
}
new_i_size = pos + copied;
if (new_i_size > inode->i_size)
i_size_write(inode, pos+copied);
@ -1911,15 +1916,29 @@ static int __ext4_journalled_writepage(struct page *page,
{
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
struct buffer_head *page_bufs;
struct buffer_head *page_bufs = NULL;
handle_t *handle = NULL;
int ret = 0;
int err;
int ret = 0, err = 0;
int inline_data = ext4_has_inline_data(inode);
struct buffer_head *inode_bh = NULL;
ClearPageChecked(page);
page_bufs = page_buffers(page);
BUG_ON(!page_bufs);
ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one);
if (inline_data) {
BUG_ON(page->index != 0);
BUG_ON(len > ext4_get_max_inline_size(inode));
inode_bh = ext4_journalled_write_inline_data(inode, len, page);
if (inode_bh == NULL)
goto out;
} else {
page_bufs = page_buffers(page);
if (!page_bufs) {
BUG();
goto out;
}
ext4_walk_page_buffers(handle, page_bufs, 0, len,
NULL, bget_one);
}
/* As soon as we unlock the page, it can go away, but we have
* references to buffers so we are safe */
unlock_page(page);
@ -1932,11 +1951,18 @@ static int __ext4_journalled_writepage(struct page *page,
BUG_ON(!ext4_handle_valid(handle));
ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL,
do_journal_get_write_access);
if (inline_data) {
ret = ext4_journal_get_write_access(handle, inode_bh);
err = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL,
write_end_fn);
err = ext4_handle_dirty_metadata(handle, inode, inode_bh);
} else {
ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL,
do_journal_get_write_access);
err = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL,
write_end_fn);
}
if (ret == 0)
ret = err;
EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid;
@ -1944,9 +1970,12 @@ static int __ext4_journalled_writepage(struct page *page,
if (!ret)
ret = err;
ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one);
if (!ext4_has_inline_data(inode))
ext4_walk_page_buffers(handle, page_bufs, 0, len,
NULL, bput_one);
ext4_set_inode_state(inode, EXT4_STATE_JDATA);
out:
brelse(inode_bh);
return ret;
}

12
fs/ext4/xattr.h
View File

@ -150,6 +150,10 @@ extern int ext4_write_inline_data_end(struct inode *inode,
loff_t pos, unsigned len,
unsigned copied,
struct page *page);
extern struct buffer_head *
ext4_journalled_write_inline_data(struct inode *inode,
unsigned len,
struct page *page);
# else /* CONFIG_EXT4_FS_XATTR */
static inline int
@ -288,6 +292,14 @@ static inline int ext4_write_inline_data_end(struct inode *inode,
{
return 0;
}
static inline struct buffer_head *
ext4_journalled_write_inline_data(struct inode *inode,
unsigned len,
struct page *page)
{
return NULL;
}
# endif /* CONFIG_EXT4_FS_XATTR */
#ifdef CONFIG_EXT4_FS_SECURITY