From: Jan Kara <jack@suse.cz>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Ext4 Developers List <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH 10/12] ext4: fix the number of credits needed for ext4_unlink() and ext4_rmdir()
Date: Mon, 11 Feb 2013 17:28:30 +0100 [thread overview]
Message-ID: <20130211162830.GM5318@quack.suse.cz> (raw)
In-Reply-To: <1360446832-12724-11-git-send-email-tytso@mit.edu>
On Sat 09-02-13 16:53:50, Ted Tso wrote:
> The ext4_unlink() and ext4_rmdir() don't actually release the blocks
> associated with the file/directory. This gets done in a separate jbd2
> handle called via ext4_evict_inode(). Thus, we don't need to reserve
> lots of journal credits for the truncate.
>
> Note that using too many journal credits is non-optimal because it can
> leading to the journal transmit getting closed too early, before it is
> strictly necessary.
Nice spotting. The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
>
> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
> ---
> fs/ext4/ext4_jbd2.h | 6 ------
> fs/ext4/namei.c | 4 ++--
> 2 files changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
> index 302814b..c1fc2dc 100644
> --- a/fs/ext4/ext4_jbd2.h
> +++ b/fs/ext4/ext4_jbd2.h
> @@ -59,12 +59,6 @@
> #define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \
> EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
>
> -/* Delete operations potentially hit one directory's namespace plus an
> - * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
> - * generous. We can grow the delete transaction later if necessary. */
> -
> -#define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64)
> -
> /* Define an arbitrary limit for the amount of data we will anticipate
> * writing to any given transaction. For unbounded transactions such as
> * write(2) and truncate(2) we can write more than this, but we always
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 36a4afd..5f3d2b5 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -2748,7 +2748,7 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
> goto end_rmdir;
>
> handle = ext4_journal_start(dir, EXT4_HT_DIR,
> - EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
> + EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
> if (IS_ERR(handle)) {
> retval = PTR_ERR(handle);
> handle = NULL;
> @@ -2811,7 +2811,7 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
> goto end_unlink;
>
> handle = ext4_journal_start(dir, EXT4_HT_DIR,
> - EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
> + EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
> if (IS_ERR(handle)) {
> retval = PTR_ERR(handle);
> handle = NULL;
> --
> 1.7.12.rc0.22.gcdd159b
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2013-02-11 16:28 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-09 21:53 [PATCH 00/12] jbd2 optimization and bug fixes Theodore Ts'o
2013-02-09 21:53 ` [PATCH 01/12] jbd2: track request delay statistics Theodore Ts'o
2013-02-11 15:57 ` Jan Kara
2013-02-09 21:53 ` [PATCH 02/12] jbd2: revert "jbd2: add COW fields to struct jbd2_journal_handle" Theodore Ts'o
2013-02-11 15:58 ` Jan Kara
2013-02-09 21:53 ` [PATCH 03/12] jbd2: add tracepoints which provide per-handle statistics Theodore Ts'o
2013-02-09 21:53 ` [PATCH 04/12] ext4: move the jbd2 wrapper functions out of super.c Theodore Ts'o
2013-02-09 21:53 ` [PATCH 05/12] ext4: pass context information to jbd2__journal_start() Theodore Ts'o
2013-02-11 16:16 ` Jan Kara
2013-02-11 18:13 ` Theodore Ts'o
2013-02-11 19:58 ` Jan Kara
2013-02-11 20:14 ` Theodore Ts'o
2013-02-09 21:53 ` [PATCH 06/12] ext4: grab page before starting transaction handle in write_begin() Theodore Ts'o
2013-02-11 16:35 ` Jan Kara
2013-02-09 21:53 ` [PATCH 07/12] ext4: start handle at the last possible moment in ext4_unlink() Theodore Ts'o
2013-02-11 16:21 ` Jan Kara
2013-02-09 21:53 ` [PATCH 08/12] ext4: start handle at the last possible moment in ext4_rmdir() Theodore Ts'o
2013-02-11 16:22 ` Jan Kara
2013-02-09 21:53 ` [PATCH 09/12] ext4: fix the number of credits needed for ext4_ext_migrate() Theodore Ts'o
2013-02-11 16:26 ` Jan Kara
2013-02-09 21:53 ` [PATCH 10/12] ext4: fix the number of credits needed for ext4_unlink() and ext4_rmdir() Theodore Ts'o
2013-02-11 16:28 ` Jan Kara [this message]
2013-02-11 18:30 ` Theodore Ts'o
2013-02-11 19:30 ` Jan Kara
2013-02-09 21:53 ` [PATCH 11/12] ext4: fix the number of credits needed for acl ops with inline data Theodore Ts'o
2013-02-10 13:42 ` Tao Ma
2013-02-10 18:15 ` Shentino
2013-02-10 19:43 ` Theodore Ts'o
2013-02-11 16:16 ` Andreas Dilger
2013-02-11 16:30 ` Jan Kara
2013-02-09 21:53 ` [PATCH 12/12] ext4: start handle at the last possible moment when creating inodes Theodore Ts'o
2013-02-11 1:47 ` Theodore Ts'o
2013-02-11 16:00 ` Andreas Dilger
2013-02-11 15:52 ` [PATCH 00/12] jbd2 optimization and bug fixes Jan Kara
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