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Date: Wed, 27 Mar 2013 13:57:32 +0100 (CET)
From: Lukáš Czerner <lczerner@...hat.com>
To: "Theodore Ts'o" <tytso@....edu>
cc: Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 1/7] ext4: collapse handling of data=ordered and
data=writeback codepaths
On Sun, 24 Mar 2013, Theodore Ts'o wrote:
> Date: Sun, 24 Mar 2013 20:06:48 -0400
> From: Theodore Ts'o <tytso@....edu>
> To: Ext4 Developers List <linux-ext4@...r.kernel.org>
> Cc: Theodore Ts'o <tytso@....edu>
> Subject: [PATCH 1/7] ext4: collapse handling of data=ordered and
> data=writeback codepaths
>
> The only difference between how we handle data=ordered and
> data=writeback is a single call to ext4_jbd2_file_inode(). Eliminate
> code duplication by factoring out redundant the code paths.
Looks good.
Reviewed-by: Lukas Czerner <lczerner@...hat.com>
Thanks!
-Lukas
>
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
> fs/ext4/ext4.h | 1 +
> fs/ext4/inode.c | 125 ++++++++++----------------------------------
> include/trace/events/ext4.h | 10 +---
> 3 files changed, 31 insertions(+), 105 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 3b83cd6..f91e11b 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1374,6 +1374,7 @@ enum {
> EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
> nolocking */
> EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
> + EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
> };
>
> #define EXT4_INODE_BIT_FNS(name, field, offset) \
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index b3a5213..4ee6927 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -1145,77 +1145,36 @@ static int ext4_generic_write_end(struct file *file,
> * ext4 never places buffers on inode->i_mapping->private_list. metadata
> * buffers are managed internally.
> */
> -static int ext4_ordered_write_end(struct file *file,
> - struct address_space *mapping,
> - loff_t pos, unsigned len, unsigned copied,
> - struct page *page, void *fsdata)
> +static int ext4_write_end(struct file *file,
> + struct address_space *mapping,
> + loff_t pos, unsigned len, unsigned copied,
> + struct page *page, void *fsdata)
> {
> handle_t *handle = ext4_journal_current_handle();
> struct inode *inode = mapping->host;
> int ret = 0, ret2;
>
> - trace_ext4_ordered_write_end(inode, pos, len, copied);
> - ret = ext4_jbd2_file_inode(handle, inode);
> -
> - if (ret == 0) {
> - ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
> - page, fsdata);
> - copied = ret2;
> - if (pos + len > inode->i_size && ext4_can_truncate(inode))
> - /* if we have allocated more blocks and copied
> - * less. We will have blocks allocated outside
> - * inode->i_size. So truncate them
> - */
> - ext4_orphan_add(handle, inode);
> - if (ret2 < 0)
> - ret = ret2;
> - } else {
> - unlock_page(page);
> - page_cache_release(page);
> - }
> -
> - ret2 = ext4_journal_stop(handle);
> - if (!ret)
> - ret = ret2;
> -
> - if (pos + len > inode->i_size) {
> - ext4_truncate_failed_write(inode);
> - /*
> - * If truncate failed early the inode might still be
> - * on the orphan list; we need to make sure the inode
> - * is removed from the orphan list in that case.
> - */
> - if (inode->i_nlink)
> - ext4_orphan_del(NULL, inode);
> + trace_ext4_write_end(inode, pos, len, copied);
> + if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE)) {
> + ret = ext4_jbd2_file_inode(handle, inode);
> + if (ret) {
> + unlock_page(page);
> + page_cache_release(page);
> + goto errout;
> + }
> }
>
> -
> - return ret ? ret : copied;
> -}
> -
> -static int ext4_writeback_write_end(struct file *file,
> - struct address_space *mapping,
> - loff_t pos, unsigned len, unsigned copied,
> - struct page *page, void *fsdata)
> -{
> - handle_t *handle = ext4_journal_current_handle();
> - struct inode *inode = mapping->host;
> - int ret = 0, ret2;
> -
> - trace_ext4_writeback_write_end(inode, pos, len, copied);
> - ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
> - page, fsdata);
> - copied = ret2;
> + copied = ext4_generic_write_end(file, mapping, pos, len, copied,
> + page, fsdata);
> + if (copied < 0)
> + ret = copied;
> if (pos + len > inode->i_size && ext4_can_truncate(inode))
> /* if we have allocated more blocks and copied
> * less. We will have blocks allocated outside
> * inode->i_size. So truncate them
> */
> ext4_orphan_add(handle, inode);
> -
> - if (ret2 < 0)
> - ret = ret2;
> -
> +errout:
> ret2 = ext4_journal_stop(handle);
> if (!ret)
> ret = ret2;
> @@ -2818,18 +2777,9 @@ static int ext4_da_write_end(struct file *file,
> unsigned long start, end;
> int write_mode = (int)(unsigned long)fsdata;
>
> - if (write_mode == FALL_BACK_TO_NONDELALLOC) {
> - switch (ext4_inode_journal_mode(inode)) {
> - case EXT4_INODE_ORDERED_DATA_MODE:
> - return ext4_ordered_write_end(file, mapping, pos,
> - len, copied, page, fsdata);
> - case EXT4_INODE_WRITEBACK_DATA_MODE:
> - return ext4_writeback_write_end(file, mapping, pos,
> - len, copied, page, fsdata);
> - default:
> - BUG();
> - }
> - }
> + if (write_mode == FALL_BACK_TO_NONDELALLOC)
> + return ext4_write_end(file, mapping, pos,
> + len, copied, page, fsdata);
>
> trace_ext4_da_write_end(inode, pos, len, copied);
> start = pos & (PAGE_CACHE_SIZE - 1);
> @@ -3334,27 +3284,12 @@ static int ext4_journalled_set_page_dirty(struct page *page)
> return __set_page_dirty_nobuffers(page);
> }
>
> -static const struct address_space_operations ext4_ordered_aops = {
> +static const struct address_space_operations ext4_aops = {
> .readpage = ext4_readpage,
> .readpages = ext4_readpages,
> .writepage = ext4_writepage,
> .write_begin = ext4_write_begin,
> - .write_end = ext4_ordered_write_end,
> - .bmap = ext4_bmap,
> - .invalidatepage = ext4_invalidatepage,
> - .releasepage = ext4_releasepage,
> - .direct_IO = ext4_direct_IO,
> - .migratepage = buffer_migrate_page,
> - .is_partially_uptodate = block_is_partially_uptodate,
> - .error_remove_page = generic_error_remove_page,
> -};
> -
> -static const struct address_space_operations ext4_writeback_aops = {
> - .readpage = ext4_readpage,
> - .readpages = ext4_readpages,
> - .writepage = ext4_writepage,
> - .write_begin = ext4_write_begin,
> - .write_end = ext4_writeback_write_end,
> + .write_end = ext4_write_end,
> .bmap = ext4_bmap,
> .invalidatepage = ext4_invalidatepage,
> .releasepage = ext4_releasepage,
> @@ -3399,23 +3334,21 @@ void ext4_set_aops(struct inode *inode)
> {
> switch (ext4_inode_journal_mode(inode)) {
> case EXT4_INODE_ORDERED_DATA_MODE:
> - if (test_opt(inode->i_sb, DELALLOC))
> - inode->i_mapping->a_ops = &ext4_da_aops;
> - else
> - inode->i_mapping->a_ops = &ext4_ordered_aops;
> + ext4_set_inode_state(inode, EXT4_STATE_ORDERED_MODE);
> break;
> case EXT4_INODE_WRITEBACK_DATA_MODE:
> - if (test_opt(inode->i_sb, DELALLOC))
> - inode->i_mapping->a_ops = &ext4_da_aops;
> - else
> - inode->i_mapping->a_ops = &ext4_writeback_aops;
> + ext4_clear_inode_state(inode, EXT4_STATE_ORDERED_MODE);
> break;
> case EXT4_INODE_JOURNAL_DATA_MODE:
> inode->i_mapping->a_ops = &ext4_journalled_aops;
> - break;
> + return;
> default:
> BUG();
> }
> + if (test_opt(inode->i_sb, DELALLOC))
> + inode->i_mapping->a_ops = &ext4_da_aops;
> + else
> + inode->i_mapping->a_ops = &ext4_aops;
> }
>
>
> diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
> index 4ee4710..58459b7 100644
> --- a/include/trace/events/ext4.h
> +++ b/include/trace/events/ext4.h
> @@ -257,15 +257,7 @@ DECLARE_EVENT_CLASS(ext4__write_end,
> __entry->pos, __entry->len, __entry->copied)
> );
>
> -DEFINE_EVENT(ext4__write_end, ext4_ordered_write_end,
> -
> - TP_PROTO(struct inode *inode, loff_t pos, unsigned int len,
> - unsigned int copied),
> -
> - TP_ARGS(inode, pos, len, copied)
> -);
> -
> -DEFINE_EVENT(ext4__write_end, ext4_writeback_write_end,
> +DEFINE_EVENT(ext4__write_end, ext4_write_end,
>
> TP_PROTO(struct inode *inode, loff_t pos, unsigned int len,
> unsigned int copied),
>
--
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