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Date: Thu, 29 Sep 2011 22:31:00 +0800
From: Tao Ma <tm@....ma>
To: Yongqiang Yang <xiaoqiangnk@...il.com>
CC: linux-ext4@...r.kernel.org, jack@...e.cz, jeff.liu@...cle.com,
achender@...ux.vnet.ibm.com, adityakali@...gle.com
Subject: Re: [RFC PATCH V2 5/6] ext4: let ext4 maintian delayed extent trees
On 09/29/2011 01:08 PM, Yongqiang Yang wrote:
> This patch let ext4 maintain delayed extent trees.
>
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
> ---
> fs/ext4/ext4.h | 1 +
> fs/ext4/extents.c | 2 ++
> fs/ext4/indirect.c | 3 +++
> fs/ext4/inode.c | 28 ++++++++++++++++++++++++++--
> fs/ext4/super.c | 12 +++++++++++-
> 5 files changed, 43 insertions(+), 3 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index d3c6b97..177ec0a 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -519,6 +519,7 @@ struct ext4_new_group_data {
> #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
> /* Don't normalize allocation size (used for fallocate) */
> #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
> +#define EXT4_GET_BLOCKS_DEALLOC 0x0080
>
> /*
> * Flags used by ext4_free_blocks
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 9124cd2..bdbb984 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3688,6 +3688,8 @@ void ext4_ext_truncate(struct inode *inode)
>
> last_block = (inode->i_size + sb->s_blocksize - 1)
> >> EXT4_BLOCK_SIZE_BITS(sb);
> + err = ext4_de_remove_space(inode, last_block,
> + EXT_MAX_BLOCKS - last_block);
> err = ext4_ext_remove_space(inode, last_block);
>
> /* In a multi-transaction truncate, we only make the final
> diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
> index 0962642..25cdb5b 100644
> --- a/fs/ext4/indirect.c
> +++ b/fs/ext4/indirect.c
> @@ -22,6 +22,7 @@
>
> #include <linux/module.h>
> #include "ext4_jbd2.h"
> +#include "ext4_extents.h"
> #include "truncate.h"
>
> #include <trace/events/ext4.h>
> @@ -1383,6 +1384,8 @@ void ext4_ind_truncate(struct inode *inode)
> down_write(&ei->i_data_sem);
>
> ext4_discard_preallocations(inode);
> + ext4_de_remove_space(inode, last_block,
> + EXT_MAX_BLOCKS - last_block);
>
> /*
> * The orphan list entry will now protect us from any crash which
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index f86b149..0f9f108 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -442,7 +442,15 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
> up_read((&EXT4_I(inode)->i_data_sem));
>
> if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
> - int ret = check_block_validity(inode, map);
> + int ret;
> + if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
> + /* delayed alloc may be allocated by fallocate,
> + * we need to handle delayed extent here.
> + */
> + down_write((&EXT4_I(inode)->i_data_sem));
> + goto delayed_mapped;
> + }
> + ret = check_block_validity(inode, map);
I am not quite sure of this. So do you mean when we write_begin the
extent isn't allocated, while in the time of writepage, the extent is
fallocted, right? If this is the case, where do we update the reserve_space?
I mean in ext4_da_get_block_prep, we call ext4_da_reserve_space, and if
there is no fallocate, we will call ext4_da_update_reserve_space in
ext4_ext_handle_uninitialized_extents. So in your case, the 2nd
ext4_da_update_reserve_space wouldn't be called. I am not sure whether
there will be some problem or not.
Thanks
Tao
> if (ret != 0)
> return ret;
> }
> @@ -517,8 +525,18 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
> (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE))
> ext4_da_update_reserve_space(inode, retval, 1);
> }
> - if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
> + if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
> ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED);
> +delayed_mapped:
> + if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
> + int ret;
> + /* delayed allocation blocks has been allocated */
> + ret = ext4_de_remove_space(inode, map->m_lblk,
> + map->m_len);
> + if (ret < 0)
> + retval = ret;
> + }
> + }
>
> up_write((&EXT4_I(inode)->i_data_sem));
> if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
> @@ -1630,6 +1648,12 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
> /* not enough space to reserve */
> return ret;
>
> + down_write((&EXT4_I(inode)->i_data_sem));
> + ret = ext4_de_add_space(inode, map.m_lblk, map.m_len);
> + up_write((&EXT4_I(inode)->i_data_sem));
> + if (ret)
> + return ret;
> +
> map_bh(bh, inode->i_sb, invalid_block);
> set_buffer_new(bh);
> set_buffer_delay(bh);
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 247fcdd..a248551 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -49,6 +49,7 @@
> #include "xattr.h"
> #include "acl.h"
> #include "mballoc.h"
> +#include "ext4_extents.h"
>
> #define CREATE_TRACE_POINTS
> #include <trace/events/ext4.h>
> @@ -967,6 +968,7 @@ void ext4_clear_inode(struct inode *inode)
> end_writeback(inode);
> dquot_drop(inode);
> ext4_discard_preallocations(inode);
> + ext4_de_remove_space(inode, 0, EXT_MAX_BLOCKS);
> if (EXT4_I(inode)->jinode) {
> jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
> EXT4_I(inode)->jinode);
> @@ -4976,9 +4978,14 @@ static int __init ext4_init_fs(void)
> init_waitqueue_head(&ext4__ioend_wq[i]);
> }
>
> - err = ext4_init_pageio();
> + err = ext4_init_de();
> if (err)
> return err;
> +
> + err = ext4_init_pageio();
> + if (err)
> + goto out8;
> +
> err = ext4_init_system_zone();
> if (err)
> goto out7;
> @@ -5030,6 +5037,9 @@ out6:
> ext4_exit_system_zone();
> out7:
> ext4_exit_pageio();
> +out8:
> + ext4_exit_de();
> +
> return err;
> }
>
--
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