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Subject[PATCH V3 06/21] ext4: Add journalled write support for inline data.
Date
From: Tao Ma <boyu.mt@taobao.com>

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
---
fs/ext4/inline.c | 24 ++++++++++++++++++++++
fs/ext4/inode.c | 59 +++++++++++++++++++++++++++++++++++++----------------
fs/ext4/xattr.h | 12 +++++++++++
3 files changed, 77 insertions(+), 18 deletions(-)

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index f974d2c..5d5a610 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -725,6 +725,30 @@ out:
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, KM_USER0);
+ ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
+ kunmap_atomic(kaddr, KM_USER0);
+ up_write(&EXT4_I(inode)->xattr_sem);
+
+ return iloc.bh;
+}
+

int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
{
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 4ab2a2e..7ae89ee 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1062,16 +1062,21 @@ 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 = walk_page_buffers(handle, page_buffers(page), from,
- to, &partial, write_end_fn);
- if (!partial)
- SetPageUptodate(page);
+ ret = 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);
@@ -1830,15 +1835,23 @@ 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;
+ struct buffer_head *inode_bh = NULL;

ClearPageChecked(page);
- page_bufs = page_buffers(page);
- BUG_ON(!page_bufs);
- walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one);
+
+ if (ext4_has_inline_data(inode)) {
+ BUG_ON(page->index != 0);
+ BUG_ON(len > ext4_get_max_inline_size(inode));
+ inode_bh = ext4_journalled_write_inline_data(inode, len, page);
+ } else {
+ page_bufs = page_buffers(page);
+ BUG_ON(!page_bufs);
+ 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);
@@ -1851,11 +1864,19 @@ static int __ext4_journalled_writepage(struct page *page,

BUG_ON(!ext4_handle_valid(handle));

- ret = walk_page_buffers(handle, page_bufs, 0, len, NULL,
- do_journal_get_write_access);
+ if (ext4_has_inline_data(inode) && inode_bh) {
+ ret = ext4_journal_get_write_access(handle, inode_bh);
+
+ err = ext4_handle_dirty_metadata(handle, inode, inode_bh);
+
+ } else {
+ ret = walk_page_buffers(handle, page_bufs, 0, len, NULL,
+ do_journal_get_write_access);
+
+ err = walk_page_buffers(handle, page_bufs, 0, len, NULL,
+ write_end_fn);
+ }

- err = 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;
@@ -1863,9 +1884,11 @@ static int __ext4_journalled_writepage(struct page *page,
if (!ret)
ret = err;

- walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one);
+ if (!ext4_has_inline_data(inode))
+ 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;
}

diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index 06b8506..48a629f 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -148,6 +148,10 @@ 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
@@ -285,6 +289,14 @@ 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
--
1.7.0.4


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