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Date: Sat, 29 Oct 2011 00:34:53 +0400
From: Dmitry Monakhov <dmonakhov@...nvz.org>
To: tytso@....edu
Cc: aneesh.kumar@...ux.vnet.ibm.com, linux-ext4@...r.kernel.org,
adilger@...ger.ca
Subject: Re: Ping...
On Sat, 17 Sep 2011 17:32:57 +0400, Dmitry Monakhov <dmonakhov@...nvz.org> wrote:
Can you please take a look at this three patches.
IMHO first two patches are simple and clean.
Last one may be good start point for discussion.
I do understand Andreas's point, and we may warn that fsck
is necessary, but still. We need MIGRATE flag to mark
temporal inode which not owns data blocks.
> This patch cleanup code a bit, actual logic not changed
> - Move current block pointer to migrate_structure, let's all
> walk info will be in one structure.
> - Get rid of usless null ind-block ptr checks, caller already
> does that check.
>
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
> ---
> fs/ext4/migrate.c | 101 ++++++++++++++++++-----------------------------------
> 1 files changed, 34 insertions(+), 67 deletions(-)
>
> diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
> index b57b98f..e263d78 100644
> --- a/fs/ext4/migrate.c
> +++ b/fs/ext4/migrate.c
> @@ -21,13 +21,14 @@
> * The contiguous blocks details which can be
> * represented by a single extent
> */
> -struct list_blocks_struct {
> - ext4_lblk_t first_block, last_block;
> +struct migrate_struct {
> + ext4_lblk_t first_block, last_block, curr_block;
> ext4_fsblk_t first_pblock, last_pblock;
> +
> };
>
> static int finish_range(handle_t *handle, struct inode *inode,
> - struct list_blocks_struct *lb)
> + struct migrate_struct *lb)
>
> {
> int retval = 0, needed;
> @@ -87,8 +88,7 @@ err_out:
> }
>
> static int update_extent_range(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t pblock, ext4_lblk_t blk_num,
> - struct list_blocks_struct *lb)
> + ext4_fsblk_t pblock, struct migrate_struct *lb)
> {
> int retval;
> /*
> @@ -96,9 +96,10 @@ static int update_extent_range(handle_t *handle, struct inode *inode,
> */
> if (lb->first_pblock &&
> (lb->last_pblock+1 == pblock) &&
> - (lb->last_block+1 == blk_num)) {
> + (lb->last_block+1 == lb->curr_block)) {
> lb->last_pblock = pblock;
> - lb->last_block = blk_num;
> + lb->last_block = lb->curr_block;
> + lb->curr_block++;
> return 0;
> }
> /*
> @@ -106,64 +107,47 @@ static int update_extent_range(handle_t *handle, struct inode *inode,
> */
> retval = finish_range(handle, inode, lb);
> lb->first_pblock = lb->last_pblock = pblock;
> - lb->first_block = lb->last_block = blk_num;
> -
> + lb->first_block = lb->last_block = lb->curr_block;
> + lb->curr_block++;
> return retval;
> }
>
> static int update_ind_extent_range(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
> - struct list_blocks_struct *lb)
> + ext4_fsblk_t pblock, struct migrate_struct *lb)
> {
> struct buffer_head *bh;
> __le32 *i_data;
> int i, retval = 0;
> - ext4_lblk_t blk_count = *blk_nump;
> unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
>
> - if (!pblock) {
> - /* Only update the file block number */
> - *blk_nump += max_entries;
> - return 0;
> - }
> -
> bh = sb_bread(inode->i_sb, pblock);
> if (!bh)
> return -EIO;
>
> i_data = (__le32 *)bh->b_data;
> - for (i = 0; i < max_entries; i++, blk_count++) {
> + for (i = 0; i < max_entries; i++) {
> if (i_data[i]) {
> retval = update_extent_range(handle, inode,
> - le32_to_cpu(i_data[i]),
> - blk_count, lb);
> + le32_to_cpu(i_data[i]), lb);
> if (retval)
> break;
> + } else {
> + lb->curr_block++;
> }
> }
> -
> - /* Update the file block number */
> - *blk_nump = blk_count;
> put_bh(bh);
> return retval;
>
> }
>
> static int update_dind_extent_range(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
> - struct list_blocks_struct *lb)
> + ext4_fsblk_t pblock, struct migrate_struct *lb)
> {
> struct buffer_head *bh;
> __le32 *i_data;
> int i, retval = 0;
> - ext4_lblk_t blk_count = *blk_nump;
> unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
>
> - if (!pblock) {
> - /* Only update the file block number */
> - *blk_nump += max_entries * max_entries;
> - return 0;
> - }
> bh = sb_bread(inode->i_sb, pblock);
> if (!bh)
> return -EIO;
> @@ -172,38 +156,27 @@ static int update_dind_extent_range(handle_t *handle, struct inode *inode,
> for (i = 0; i < max_entries; i++) {
> if (i_data[i]) {
> retval = update_ind_extent_range(handle, inode,
> - le32_to_cpu(i_data[i]),
> - &blk_count, lb);
> + le32_to_cpu(i_data[i]), lb);
> if (retval)
> break;
> } else {
> /* Only update the file block number */
> - blk_count += max_entries;
> + lb->curr_block += max_entries;
> }
> }
> -
> - /* Update the file block number */
> - *blk_nump = blk_count;
> put_bh(bh);
> return retval;
>
> }
>
> static int update_tind_extent_range(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
> - struct list_blocks_struct *lb)
> + ext4_fsblk_t pblock, struct migrate_struct *lb)
> {
> struct buffer_head *bh;
> __le32 *i_data;
> int i, retval = 0;
> - ext4_lblk_t blk_count = *blk_nump;
> unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
>
> - if (!pblock) {
> - /* Only update the file block number */
> - *blk_nump += max_entries * max_entries * max_entries;
> - return 0;
> - }
> bh = sb_bread(inode->i_sb, pblock);
> if (!bh)
> return -EIO;
> @@ -211,17 +184,15 @@ static int update_tind_extent_range(handle_t *handle, struct inode *inode,
> i_data = (__le32 *)bh->b_data;
> for (i = 0; i < max_entries; i++) {
> if (i_data[i]) {
> - retval = update_dind_extent_range(handle, inode,
> - le32_to_cpu(i_data[i]),
> - &blk_count, lb);
> + retval = update_ind_extent_range(handle, inode,
> + le32_to_cpu(i_data[i]), lb);
> if (retval)
> break;
> - } else
> + } else {
> /* Only update the file block number */
> - blk_count += max_entries * max_entries;
> + lb->curr_block += max_entries * max_entries;
> + }
> }
> - /* Update the file block number */
> - *blk_nump = blk_count;
> put_bh(bh);
> return retval;
>
> @@ -462,10 +433,9 @@ int ext4_ext_migrate(struct inode *inode)
> handle_t *handle;
> int retval = 0, i;
> __le32 *i_data;
> - ext4_lblk_t blk_count = 0;
> struct ext4_inode_info *ei;
> struct inode *tmp_inode = NULL;
> - struct list_blocks_struct lb;
> + struct migrate_struct lb;
> unsigned long max_entries;
> __u32 goal;
>
> @@ -551,35 +521,32 @@ int ext4_ext_migrate(struct inode *inode)
>
> /* 32 bit block address 4 bytes */
> max_entries = inode->i_sb->s_blocksize >> 2;
> - for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
> + for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
> if (i_data[i]) {
> retval = update_extent_range(handle, tmp_inode,
> - le32_to_cpu(i_data[i]),
> - blk_count, &lb);
> + le32_to_cpu(i_data[i]), &lb);
> if (retval)
> goto err_out;
> - }
> + } else
> + lb.curr_block++;
> }
> if (i_data[EXT4_IND_BLOCK]) {
> retval = update_ind_extent_range(handle, tmp_inode,
> - le32_to_cpu(i_data[EXT4_IND_BLOCK]),
> - &blk_count, &lb);
> + le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
> if (retval)
> goto err_out;
> } else
> - blk_count += max_entries;
> + lb.curr_block += max_entries;
> if (i_data[EXT4_DIND_BLOCK]) {
> retval = update_dind_extent_range(handle, tmp_inode,
> - le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
> - &blk_count, &lb);
> + le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
> if (retval)
> goto err_out;
> } else
> - blk_count += max_entries * max_entries;
> + lb.curr_block += max_entries * max_entries;
> if (i_data[EXT4_TIND_BLOCK]) {
> retval = update_tind_extent_range(handle, tmp_inode,
> - le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
> - &blk_count, &lb);
> + le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
> if (retval)
> goto err_out;
> }
> --
> 1.7.2.3
>
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