forked from Minki/linux
ext4: migrate cleanup
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@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Dmitry Monakhov
Theodore Ts'o
parent
6cdbb0effc
commit
fba90ffee8
@ -20,13 +20,13 @@
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* The contiguous blocks details which can be
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* represented by a single extent
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*/
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struct list_blocks_struct {
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ext4_lblk_t first_block, last_block;
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struct migrate_struct {
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ext4_lblk_t first_block, last_block, curr_block;
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ext4_fsblk_t first_pblock, last_pblock;
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};
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static int finish_range(handle_t *handle, struct inode *inode,
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struct list_blocks_struct *lb)
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struct migrate_struct *lb)
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{
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int retval = 0, needed;
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@ -86,8 +86,7 @@ err_out:
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}
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static int update_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock, ext4_lblk_t blk_num,
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struct list_blocks_struct *lb)
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ext4_fsblk_t pblock, struct migrate_struct *lb)
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{
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int retval;
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/*
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@ -95,9 +94,10 @@ static int update_extent_range(handle_t *handle, struct inode *inode,
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*/
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if (lb->first_pblock &&
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(lb->last_pblock+1 == pblock) &&
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(lb->last_block+1 == blk_num)) {
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(lb->last_block+1 == lb->curr_block)) {
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lb->last_pblock = pblock;
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lb->last_block = blk_num;
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lb->last_block = lb->curr_block;
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lb->curr_block++;
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return 0;
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}
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/*
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@ -105,64 +105,49 @@ static int update_extent_range(handle_t *handle, struct inode *inode,
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*/
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retval = finish_range(handle, inode, lb);
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lb->first_pblock = lb->last_pblock = pblock;
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lb->first_block = lb->last_block = blk_num;
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lb->first_block = lb->last_block = lb->curr_block;
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lb->curr_block++;
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return retval;
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}
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static int update_ind_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
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struct list_blocks_struct *lb)
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ext4_fsblk_t pblock,
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struct migrate_struct *lb)
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{
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struct buffer_head *bh;
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__le32 *i_data;
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int i, retval = 0;
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ext4_lblk_t blk_count = *blk_nump;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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if (!pblock) {
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/* Only update the file block number */
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*blk_nump += max_entries;
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return 0;
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}
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bh = sb_bread(inode->i_sb, pblock);
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if (!bh)
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return -EIO;
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i_data = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++, blk_count++) {
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for (i = 0; i < max_entries; i++) {
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if (i_data[i]) {
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retval = update_extent_range(handle, inode,
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le32_to_cpu(i_data[i]),
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blk_count, lb);
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le32_to_cpu(i_data[i]), lb);
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if (retval)
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break;
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} else {
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lb->curr_block++;
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}
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}
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/* Update the file block number */
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*blk_nump = blk_count;
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put_bh(bh);
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return retval;
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}
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static int update_dind_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
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struct list_blocks_struct *lb)
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ext4_fsblk_t pblock,
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struct migrate_struct *lb)
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{
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struct buffer_head *bh;
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__le32 *i_data;
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int i, retval = 0;
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ext4_lblk_t blk_count = *blk_nump;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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if (!pblock) {
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/* Only update the file block number */
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*blk_nump += max_entries * max_entries;
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return 0;
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}
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bh = sb_bread(inode->i_sb, pblock);
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if (!bh)
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return -EIO;
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@ -171,38 +156,28 @@ static int update_dind_extent_range(handle_t *handle, struct inode *inode,
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for (i = 0; i < max_entries; i++) {
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if (i_data[i]) {
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retval = update_ind_extent_range(handle, inode,
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le32_to_cpu(i_data[i]),
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&blk_count, lb);
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le32_to_cpu(i_data[i]), lb);
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if (retval)
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break;
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} else {
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/* Only update the file block number */
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blk_count += max_entries;
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lb->curr_block += max_entries;
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}
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}
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/* Update the file block number */
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*blk_nump = blk_count;
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put_bh(bh);
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return retval;
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}
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static int update_tind_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
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struct list_blocks_struct *lb)
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ext4_fsblk_t pblock,
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struct migrate_struct *lb)
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{
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struct buffer_head *bh;
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__le32 *i_data;
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int i, retval = 0;
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ext4_lblk_t blk_count = *blk_nump;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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if (!pblock) {
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/* Only update the file block number */
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*blk_nump += max_entries * max_entries * max_entries;
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return 0;
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}
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bh = sb_bread(inode->i_sb, pblock);
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if (!bh)
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return -EIO;
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@ -211,16 +186,14 @@ static int update_tind_extent_range(handle_t *handle, struct inode *inode,
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for (i = 0; i < max_entries; i++) {
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if (i_data[i]) {
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retval = update_dind_extent_range(handle, inode,
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le32_to_cpu(i_data[i]),
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&blk_count, lb);
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le32_to_cpu(i_data[i]), lb);
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if (retval)
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break;
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} else
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} else {
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/* Only update the file block number */
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blk_count += max_entries * max_entries;
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lb->curr_block += max_entries * max_entries;
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}
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}
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/* Update the file block number */
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*blk_nump = blk_count;
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put_bh(bh);
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return retval;
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@ -461,10 +434,9 @@ int ext4_ext_migrate(struct inode *inode)
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handle_t *handle;
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int retval = 0, i;
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__le32 *i_data;
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ext4_lblk_t blk_count = 0;
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struct ext4_inode_info *ei;
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struct inode *tmp_inode = NULL;
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struct list_blocks_struct lb;
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struct migrate_struct lb;
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unsigned long max_entries;
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__u32 goal;
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@ -550,35 +522,32 @@ int ext4_ext_migrate(struct inode *inode)
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/* 32 bit block address 4 bytes */
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max_entries = inode->i_sb->s_blocksize >> 2;
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for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
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for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
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if (i_data[i]) {
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retval = update_extent_range(handle, tmp_inode,
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le32_to_cpu(i_data[i]),
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blk_count, &lb);
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le32_to_cpu(i_data[i]), &lb);
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if (retval)
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goto err_out;
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}
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} else
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lb.curr_block++;
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}
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if (i_data[EXT4_IND_BLOCK]) {
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retval = update_ind_extent_range(handle, tmp_inode,
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le32_to_cpu(i_data[EXT4_IND_BLOCK]),
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&blk_count, &lb);
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le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
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if (retval)
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goto err_out;
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} else
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blk_count += max_entries;
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lb.curr_block += max_entries;
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if (i_data[EXT4_DIND_BLOCK]) {
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retval = update_dind_extent_range(handle, tmp_inode,
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le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
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&blk_count, &lb);
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le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
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if (retval)
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goto err_out;
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} else
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blk_count += max_entries * max_entries;
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lb.curr_block += max_entries * max_entries;
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if (i_data[EXT4_TIND_BLOCK]) {
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retval = update_tind_extent_range(handle, tmp_inode,
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le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
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&blk_count, &lb);
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le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
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if (retval)
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goto err_out;
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}
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