[PATCH V6 06/23] ext4: Add journalled write support for inline data.
From: Tao Ma <hidden>
Date: 2012-09-14 11:25:26
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
From: Tao Ma <redacted> Signed-off-by: Tao Ma <redacted> --- 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 50c3e95..fc42ed0 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c@@ -741,6 +741,30 @@ 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); + 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) {
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index de11f32..7a6d11a 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c@@ -1150,16 +1150,21 @@ 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);
@@ -1933,15 +1938,23 @@ 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);
@@ -1954,11 +1967,19 @@ 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;
@@ -1966,9 +1987,11 @@ 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 7d9bf51..91df676 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h@@ -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
@@ -287,6 +291,14 @@ 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
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1.7.1