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Date: Fri, 30 Sep 2011 10:08:50 +0800
From: Yongqiang Yang <xiaoqiangnk@...il.com>
To: Tao Ma <tm@....ma>
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 Thu, Sep 29, 2011 at 10:31 PM, Tao Ma <tm@....ma> wrote:
> 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.
Hi Tao,
What if fallocated blocks have been allocated by direct I/O? I placed
a BUG() here, it was indeed triggered by xfstests 127.
The comment is not clear, sorry for that.
Yongqiang.
>
> 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;
>> }
>>
>
>
--
Best Wishes
Yongqiang Yang
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