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Date: Tue, 9 Apr 2013 15:24:33 +0200
From: Jan Kara <jack@...e.cz>
To: Lukas Czerner <lczerner@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH v3 03/18] ext4: use ->invalidatepage() length argument
On Tue 09-04-13 11:14:12, Lukas Czerner wrote:
> ->invalidatepage() aop now accepts range to invalidate so we can make
> use of it in all ext4 invalidatepage routines.
Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
>
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
> fs/ext4/inode.c | 30 +++++++++++++++++++-----------
> include/trace/events/ext4.h | 22 ++++++++++++----------
> 2 files changed, 31 insertions(+), 21 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 69595f5..f80e0c3 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -1411,21 +1411,28 @@ static void ext4_da_release_space(struct inode *inode, int to_free)
> }
>
> static void ext4_da_page_release_reservation(struct page *page,
> - unsigned long offset)
> + unsigned int offset,
> + unsigned int length)
> {
> int to_release = 0;
> struct buffer_head *head, *bh;
> unsigned int curr_off = 0;
> struct inode *inode = page->mapping->host;
> struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
> + unsigned int stop = offset + length;
> int num_clusters;
> ext4_fsblk_t lblk;
>
> + BUG_ON(stop > PAGE_CACHE_SIZE || stop < length);
> +
> head = page_buffers(page);
> bh = head;
> do {
> unsigned int next_off = curr_off + bh->b_size;
>
> + if (next_off > stop)
> + break;
> +
> if ((offset <= curr_off) && (buffer_delay(bh))) {
> to_release++;
> clear_buffer_delay(bh);
> @@ -2825,7 +2832,7 @@ static void ext4_da_invalidatepage(struct page *page, unsigned int offset,
> if (!page_has_buffers(page))
> goto out;
>
> - ext4_da_page_release_reservation(page, offset);
> + ext4_da_page_release_reservation(page, offset, length);
>
> out:
> ext4_invalidatepage(page, offset, length);
> @@ -2979,29 +2986,29 @@ ext4_readpages(struct file *file, struct address_space *mapping,
> static void ext4_invalidatepage(struct page *page, unsigned int offset,
> unsigned int length)
> {
> - trace_ext4_invalidatepage(page, offset);
> + trace_ext4_invalidatepage(page, offset, length);
>
> /* No journalling happens on data buffers when this function is used */
> WARN_ON(page_has_buffers(page) && buffer_jbd(page_buffers(page)));
>
> - block_invalidatepage(page, offset, PAGE_CACHE_SIZE - offset);
> + block_invalidatepage(page, offset, length);
> }
>
> static int __ext4_journalled_invalidatepage(struct page *page,
> - unsigned long offset)
> + unsigned int offset,
> + unsigned int length)
> {
> journal_t *journal = EXT4_JOURNAL(page->mapping->host);
>
> - trace_ext4_journalled_invalidatepage(page, offset);
> + trace_ext4_journalled_invalidatepage(page, offset, length);
>
> /*
> * If it's a full truncate we just forget about the pending dirtying
> */
> - if (offset == 0)
> + if (offset == 0 && length == PAGE_CACHE_SIZE)
> ClearPageChecked(page);
>
> - return jbd2_journal_invalidatepage(journal, page, offset,
> - PAGE_CACHE_SIZE - offset);
> + return jbd2_journal_invalidatepage(journal, page, offset, length);
> }
>
> /* Wrapper for aops... */
> @@ -3009,7 +3016,7 @@ static void ext4_journalled_invalidatepage(struct page *page,
> unsigned int offset,
> unsigned int length)
> {
> - WARN_ON(__ext4_journalled_invalidatepage(page, offset) < 0);
> + WARN_ON(__ext4_journalled_invalidatepage(page, offset, length) < 0);
> }
>
> static int ext4_releasepage(struct page *page, gfp_t wait)
> @@ -4607,7 +4614,8 @@ static void ext4_wait_for_tail_page_commit(struct inode *inode)
> inode->i_size >> PAGE_CACHE_SHIFT);
> if (!page)
> return;
> - ret = __ext4_journalled_invalidatepage(page, offset);
> + ret = __ext4_journalled_invalidatepage(page, offset,
> + PAGE_CACHE_SIZE - offset);
> unlock_page(page);
> page_cache_release(page);
> if (ret != -EBUSY)
> diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
> index 58459b7..60b329a 100644
> --- a/include/trace/events/ext4.h
> +++ b/include/trace/events/ext4.h
> @@ -444,16 +444,16 @@ DEFINE_EVENT(ext4__page_op, ext4_releasepage,
> );
>
> DECLARE_EVENT_CLASS(ext4_invalidatepage_op,
> - TP_PROTO(struct page *page, unsigned long offset),
> + TP_PROTO(struct page *page, unsigned int offset, unsigned int length),
>
> - TP_ARGS(page, offset),
> + TP_ARGS(page, offset, length),
>
> TP_STRUCT__entry(
> __field( dev_t, dev )
> __field( ino_t, ino )
> __field( pgoff_t, index )
> - __field( unsigned long, offset )
> -
> + __field( unsigned int, offset )
> + __field( unsigned int, length )
> ),
>
> TP_fast_assign(
> @@ -461,24 +461,26 @@ DECLARE_EVENT_CLASS(ext4_invalidatepage_op,
> __entry->ino = page->mapping->host->i_ino;
> __entry->index = page->index;
> __entry->offset = offset;
> + __entry->length = length;
> ),
>
> - TP_printk("dev %d,%d ino %lu page_index %lu offset %lu",
> + TP_printk("dev %d,%d ino %lu page_index %lu offset %u length %u",
> MAJOR(__entry->dev), MINOR(__entry->dev),
> (unsigned long) __entry->ino,
> - (unsigned long) __entry->index, __entry->offset)
> + (unsigned long) __entry->index,
> + __entry->offset, __entry->length)
> );
>
> DEFINE_EVENT(ext4_invalidatepage_op, ext4_invalidatepage,
> - TP_PROTO(struct page *page, unsigned long offset),
> + TP_PROTO(struct page *page, unsigned int offset, unsigned int length),
>
> - TP_ARGS(page, offset)
> + TP_ARGS(page, offset, length)
> );
>
> DEFINE_EVENT(ext4_invalidatepage_op, ext4_journalled_invalidatepage,
> - TP_PROTO(struct page *page, unsigned long offset),
> + TP_PROTO(struct page *page, unsigned int offset, unsigned int length),
>
> - TP_ARGS(page, offset)
> + TP_ARGS(page, offset, length)
> );
>
> TRACE_EVENT(ext4_discard_blocks,
> --
> 1.7.7.6
>
> --
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--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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