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Message-ID: <20120106003339.GB3790@quack.suse.cz>
Date: Fri, 6 Jan 2012 01:33:39 +0100
From: Jan Kara <jack@...e.cz>
To: Kamal Mostafa <kamal@...onical.com>
Cc: Jan Kara <jack@...e.cz>, Alexander Viro <viro@...iv.linux.org.uk>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Matthew Wilcox <matthew@....cx>,
Randy Dunlap <rdunlap@...otime.net>,
Theodore Tso <tytso@....edu>, linux-doc@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, Surbhi Palande <csurbhi@...il.com>,
Valerie Aurora <val@...consulting.com>,
Christopher Chaltain <christopher.chaltain@...onical.com>,
"Peter M. Petrakis" <peter.petrakis@...onical.com>,
Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [PATCH v2 4/7] VFS: Rename and refactor
writeback_inodes_sb_if_idle
On Thu 08-12-11 10:04:34, Kamal Mostafa wrote:
> Rename writeback_inodes_sb{_nr}_if_idle to try_to_writeback_inodes_sb{_nr}
> and refactor to avoid duplicating logic.
Looks good to me. You can add:
Acked-by: Jan Kara <jack@...e.cz>
Honza
>
> Signed-off-by: Kamal Mostafa <kamal@...onical.com>
> ---
> fs/btrfs/extent-tree.c | 2 +-
> fs/ext4/inode.c | 2 +-
> fs/fs-writeback.c | 25 +++++++++++--------------
> include/linux/writeback.h | 4 ++--
> 4 files changed, 15 insertions(+), 18 deletions(-)
>
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index f0d5718..6f6fe2b 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -3416,7 +3416,7 @@ static int shrink_delalloc(struct btrfs_root *root, u64 to_reclaim,
> smp_mb();
> nr_pages = min_t(unsigned long, nr_pages,
> root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT);
> - writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages,
> + try_to_writeback_inodes_sb_nr(root->fs_info->sb, nr_pages,
> WB_REASON_FS_FREE_SPACE);
>
> spin_lock(&space_info->lock);
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 848f436..0da75cd 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2373,7 +2373,7 @@ static int ext4_nonda_switch(struct super_block *sb)
> * start pushing delalloc when 1/2 of free blocks are dirty.
> */
> if (free_blocks < 2 * dirty_blocks)
> - writeback_inodes_sb_if_idle(sb, WB_REASON_FS_FREE_SPACE);
> + try_to_writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE);
>
> return 0;
> }
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index eee01cd..ea89b3f 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -1271,45 +1271,42 @@ void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
> EXPORT_SYMBOL(writeback_inodes_sb);
>
> /**
> - * writeback_inodes_sb_if_idle - start writeback if none underway
> + * try_to_writeback_inodes_sb - start writeback if none underway
> * @sb: the superblock
> *
> * Invoke writeback_inodes_sb if no writeback is currently underway.
> * Returns 1 if writeback was started, 0 if not.
> */
> -int writeback_inodes_sb_if_idle(struct super_block *sb, enum wb_reason reason)
> +int try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
> {
> - if (!writeback_in_progress(sb->s_bdi)) {
> - down_read(&sb->s_umount);
> - writeback_inodes_sb(sb, reason);
> - up_read(&sb->s_umount);
> - return 1;
> - } else
> - return 0;
> + return try_to_writeback_inodes_sb_nr(sb, 0, reason);
> }
> -EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
> +EXPORT_SYMBOL(try_to_writeback_inodes_sb);
>
> /**
> - * writeback_inodes_sb_if_idle - start writeback if none underway
> + * try_to_writeback_inodes_sb_nr - start writeback if none underway
> * @sb: the superblock
> * @nr: the number of pages to write
> *
> * Invoke writeback_inodes_sb if no writeback is currently underway.
> * Returns 1 if writeback was started, 0 if not.
> */
> -int writeback_inodes_sb_nr_if_idle(struct super_block *sb,
> +int try_to_writeback_inodes_sb_nr(struct super_block *sb,
> unsigned long nr,
> enum wb_reason reason)
> {
> if (!writeback_in_progress(sb->s_bdi)) {
> down_read(&sb->s_umount);
> - writeback_inodes_sb_nr(sb, nr, reason);
> + if (nr == 0)
> + writeback_inodes_sb(sb, reason);
> + else
> + writeback_inodes_sb_nr(sb, nr, reason);
> up_read(&sb->s_umount);
> return 1;
> } else
> return 0;
> }
> -EXPORT_SYMBOL(writeback_inodes_sb_nr_if_idle);
> +EXPORT_SYMBOL(try_to_writeback_inodes_sb_nr);
>
> /**
> * sync_inodes_sb - sync sb inode pages
> diff --git a/include/linux/writeback.h b/include/linux/writeback.h
> index a378c29..e824225 100644
> --- a/include/linux/writeback.h
> +++ b/include/linux/writeback.h
> @@ -89,8 +89,8 @@ int inode_wait(void *);
> void writeback_inodes_sb(struct super_block *, enum wb_reason reason);
> void writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
> enum wb_reason reason);
> -int writeback_inodes_sb_if_idle(struct super_block *, enum wb_reason reason);
> -int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr,
> +int try_to_writeback_inodes_sb(struct super_block *, enum wb_reason reason);
> +int try_to_writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
> enum wb_reason reason);
> void sync_inodes_sb(struct super_block *);
> long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
> --
> 1.7.5.4
>
--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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