forked from Minki/linux
ext4: Add EXT4_IOC_MIGRATE ioctl
The below patch add ioctl for migrating ext3 indirect block mapped inode to ext4 extent mapped inode. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Aneesh Kumar K.V
Theodore Ts'o
parent
25ec56b518
commit
c14c6fd5c5
@ -6,7 +6,7 @@ obj-$(CONFIG_EXT4DEV_FS) += ext4dev.o
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ext4dev-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
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ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
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ext4_jbd2.o
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ext4_jbd2.o migrate.o
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ext4dev-$(CONFIG_EXT4DEV_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
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ext4dev-$(CONFIG_EXT4DEV_FS_POSIX_ACL) += acl.o
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@ -61,7 +61,7 @@ static ext4_fsblk_t ext_pblock(struct ext4_extent *ex)
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* idx_pblock:
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* combine low and high parts of a leaf physical block number into ext4_fsblk_t
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*/
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static ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
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ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
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{
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ext4_fsblk_t block;
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@ -75,7 +75,7 @@ static ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
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* stores a large physical block number into an extent struct,
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* breaking it into parts
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*/
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static void ext4_ext_store_pblock(struct ext4_extent *ex, ext4_fsblk_t pb)
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void ext4_ext_store_pblock(struct ext4_extent *ex, ext4_fsblk_t pb)
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{
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ex->ee_start_lo = cpu_to_le32((unsigned long) (pb & 0xffffffff));
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ex->ee_start_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
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@ -254,6 +254,9 @@ flags_err:
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return err;
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}
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case EXT4_IOC_MIGRATE:
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return ext4_ext_migrate(inode, filp, cmd, arg);
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default:
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return -ENOTTY;
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}
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560
fs/ext4/migrate.c
Normal file
560
fs/ext4/migrate.c
Normal file
@ -0,0 +1,560 @@
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/*
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* Copyright IBM Corporation, 2007
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include <linux/module.h>
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#include <linux/ext4_jbd2.h>
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#include <linux/ext4_fs_extents.h>
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/*
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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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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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{
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int retval = 0, needed;
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struct ext4_extent newext;
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struct ext4_ext_path *path;
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if (lb->first_pblock == 0)
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return 0;
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/* Add the extent to temp inode*/
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newext.ee_block = cpu_to_le32(lb->first_block);
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newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
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ext4_ext_store_pblock(&newext, lb->first_pblock);
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path = ext4_ext_find_extent(inode, lb->first_block, NULL);
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if (IS_ERR(path)) {
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retval = PTR_ERR(path);
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goto err_out;
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}
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/*
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* Calculate the credit needed to inserting this extent
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* Since we are doing this in loop we may accumalate extra
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* credit. But below we try to not accumalate too much
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* of them by restarting the journal.
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*/
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needed = ext4_ext_calc_credits_for_insert(inode, path);
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/*
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* Make sure the credit we accumalated is not really high
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*/
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if (needed && handle->h_buffer_credits >= EXT4_RESERVE_TRANS_BLOCKS) {
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retval = ext4_journal_restart(handle, needed);
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if (retval)
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goto err_out;
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}
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if (needed) {
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retval = ext4_journal_extend(handle, needed);
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if (retval != 0) {
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/*
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* IF not able to extend the journal restart the journal
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*/
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retval = ext4_journal_restart(handle, needed);
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if (retval)
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goto err_out;
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}
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}
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retval = ext4_ext_insert_extent(handle, inode, path, &newext);
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err_out:
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lb->first_pblock = 0;
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return retval;
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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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{
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int retval;
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/*
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* See if we can add on to the existing range (if it exists)
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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_pblock = pblock;
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lb->last_block = blk_num;
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return 0;
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}
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/*
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* Start a new range.
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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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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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{
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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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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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if (retval)
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break;
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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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{
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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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i_data = (__le32 *)bh->b_data;
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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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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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}
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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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{
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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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i_data = (__le32 *)bh->b_data;
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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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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 * max_entries;
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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 free_dind_blocks(handle_t *handle,
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struct inode *inode, __le32 i_data)
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{
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int i;
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__le32 *tmp_idata;
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struct buffer_head *bh;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
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if (!bh)
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return -EIO;
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tmp_idata = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++) {
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if (tmp_idata[i])
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ext4_free_blocks(handle, inode,
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le32_to_cpu(tmp_idata[i]), 1);
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}
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put_bh(bh);
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ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1);
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return 0;
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}
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static int free_tind_blocks(handle_t *handle,
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struct inode *inode, __le32 i_data)
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{
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int i, retval = 0;
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__le32 *tmp_idata;
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struct buffer_head *bh;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
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if (!bh)
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return -EIO;
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tmp_idata = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++) {
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if (tmp_idata[i]) {
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retval = free_dind_blocks(handle,
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inode, tmp_idata[i]);
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if (retval) {
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put_bh(bh);
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return retval;
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}
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}
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}
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put_bh(bh);
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ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1);
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return 0;
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}
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static int free_ind_block(handle_t *handle, struct inode *inode)
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{
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int retval;
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struct ext4_inode_info *ei = EXT4_I(inode);
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if (ei->i_data[EXT4_IND_BLOCK])
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ext4_free_blocks(handle, inode,
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le32_to_cpu(ei->i_data[EXT4_IND_BLOCK]), 1);
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if (ei->i_data[EXT4_DIND_BLOCK]) {
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retval = free_dind_blocks(handle, inode,
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ei->i_data[EXT4_DIND_BLOCK]);
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if (retval)
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return retval;
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}
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if (ei->i_data[EXT4_TIND_BLOCK]) {
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retval = free_tind_blocks(handle, inode,
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ei->i_data[EXT4_TIND_BLOCK]);
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if (retval)
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return retval;
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}
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return 0;
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}
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static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
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struct inode *tmp_inode, int retval)
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{
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struct ext4_inode_info *ei = EXT4_I(inode);
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struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
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retval = free_ind_block(handle, inode);
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if (retval)
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goto err_out;
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/*
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* One credit accounted for writing the
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* i_data field of the original inode
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*/
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retval = ext4_journal_extend(handle, 1);
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if (retval != 0) {
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retval = ext4_journal_restart(handle, 1);
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if (retval)
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goto err_out;
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}
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/*
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* We have the extent map build with the tmp inode.
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* Now copy the i_data across
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*/
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ei->i_flags |= EXT4_EXTENTS_FL;
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memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
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/*
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* Update i_blocks with the new blocks that got
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* allocated while adding extents for extent index
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* blocks.
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*
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* While converting to extents we need not
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* update the orignal inode i_blocks for extent blocks
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* via quota APIs. The quota update happened via tmp_inode already.
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*/
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spin_lock(&inode->i_lock);
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inode->i_blocks += tmp_inode->i_blocks;
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spin_unlock(&inode->i_lock);
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ext4_mark_inode_dirty(handle, inode);
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err_out:
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return retval;
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}
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static int free_ext_idx(handle_t *handle, struct inode *inode,
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struct ext4_extent_idx *ix)
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{
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int i, retval = 0;
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ext4_fsblk_t block;
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struct buffer_head *bh;
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struct ext4_extent_header *eh;
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block = idx_pblock(ix);
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bh = sb_bread(inode->i_sb, block);
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if (!bh)
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return -EIO;
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eh = (struct ext4_extent_header *)bh->b_data;
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if (eh->eh_depth != 0) {
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ix = EXT_FIRST_INDEX(eh);
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for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
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retval = free_ext_idx(handle, inode, ix);
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if (retval)
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break;
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}
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}
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put_bh(bh);
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ext4_free_blocks(handle, inode, block, 1);
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return retval;
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}
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/*
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* Free the extent meta data blocks only
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*/
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static int free_ext_block(handle_t *handle, struct inode *inode)
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{
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int i, retval = 0;
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struct ext4_inode_info *ei = EXT4_I(inode);
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struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
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struct ext4_extent_idx *ix;
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if (eh->eh_depth == 0)
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/*
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* No extra blocks allocated for extent meta data
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*/
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return 0;
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ix = EXT_FIRST_INDEX(eh);
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for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
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retval = free_ext_idx(handle, inode, ix);
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if (retval)
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return retval;
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}
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return retval;
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}
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int ext4_ext_migrate(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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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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unsigned long max_entries;
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if (!test_opt(inode->i_sb, EXTENTS))
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/*
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* if mounted with noextents we don't allow the migrate
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*/
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return -EINVAL;
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if ((EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
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return -EINVAL;
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down_write(&EXT4_I(inode)->i_data_sem);
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handle = ext4_journal_start(inode,
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EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
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EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
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2 * EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)
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+ 1);
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if (IS_ERR(handle)) {
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retval = PTR_ERR(handle);
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goto err_out;
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}
|
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tmp_inode = ext4_new_inode(handle,
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inode->i_sb->s_root->d_inode,
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S_IFREG);
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if (IS_ERR(tmp_inode)) {
|
||||
retval = -ENOMEM;
|
||||
ext4_journal_stop(handle);
|
||||
tmp_inode = NULL;
|
||||
goto err_out;
|
||||
}
|
||||
i_size_write(tmp_inode, i_size_read(inode));
|
||||
/*
|
||||
* We don't want the inode to be reclaimed
|
||||
* if we got interrupted in between. We have
|
||||
* this tmp inode carrying reference to the
|
||||
* data blocks of the original file. We set
|
||||
* the i_nlink to zero at the last stage after
|
||||
* switching the original file to extent format
|
||||
*/
|
||||
tmp_inode->i_nlink = 1;
|
||||
|
||||
ext4_ext_tree_init(handle, tmp_inode);
|
||||
ext4_orphan_add(handle, tmp_inode);
|
||||
ext4_journal_stop(handle);
|
||||
|
||||
ei = EXT4_I(inode);
|
||||
i_data = ei->i_data;
|
||||
memset(&lb, 0, sizeof(lb));
|
||||
|
||||
/* 32 bit block address 4 bytes */
|
||||
max_entries = inode->i_sb->s_blocksize >> 2;
|
||||
|
||||
/*
|
||||
* start with one credit accounted for
|
||||
* superblock modification.
|
||||
*
|
||||
* For the tmp_inode we already have commited the
|
||||
* trascation that created the inode. Later as and
|
||||
* when we add extents we extent the journal
|
||||
*/
|
||||
handle = ext4_journal_start(inode, 1);
|
||||
for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
|
||||
if (i_data[i]) {
|
||||
retval = update_extent_range(handle, tmp_inode,
|
||||
le32_to_cpu(i_data[i]),
|
||||
blk_count, &lb);
|
||||
if (retval)
|
||||
goto err_out;
|
||||
}
|
||||
}
|
||||
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);
|
||||
if (retval)
|
||||
goto err_out;
|
||||
} else
|
||||
blk_count += 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);
|
||||
if (retval)
|
||||
goto err_out;
|
||||
} else
|
||||
blk_count += 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);
|
||||
if (retval)
|
||||
goto err_out;
|
||||
}
|
||||
/*
|
||||
* Build the last extent
|
||||
*/
|
||||
retval = finish_range(handle, tmp_inode, &lb);
|
||||
err_out:
|
||||
/*
|
||||
* We are either freeing extent information or indirect
|
||||
* blocks. During this we touch superblock, group descriptor
|
||||
* and block bitmap. Later we mark the tmp_inode dirty
|
||||
* via ext4_ext_tree_init. So allocate a credit of 4
|
||||
* We may update quota (user and group).
|
||||
*
|
||||
* FIXME!! we may be touching bitmaps in different block groups.
|
||||
*/
|
||||
if (ext4_journal_extend(handle,
|
||||
4 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb)) != 0)
|
||||
ext4_journal_restart(handle,
|
||||
4 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb));
|
||||
if (retval)
|
||||
/*
|
||||
* Failure case delete the extent information with the
|
||||
* tmp_inode
|
||||
*/
|
||||
free_ext_block(handle, tmp_inode);
|
||||
else
|
||||
retval = ext4_ext_swap_inode_data(handle, inode,
|
||||
tmp_inode, retval);
|
||||
|
||||
/*
|
||||
* Mark the tmp_inode as of size zero
|
||||
*/
|
||||
i_size_write(tmp_inode, 0);
|
||||
|
||||
/*
|
||||
* set the i_blocks count to zero
|
||||
* so that the ext4_delete_inode does the
|
||||
* right job
|
||||
*
|
||||
* We don't need to take the i_lock because
|
||||
* the inode is not visible to user space.
|
||||
*/
|
||||
tmp_inode->i_blocks = 0;
|
||||
|
||||
/* Reset the extent details */
|
||||
ext4_ext_tree_init(handle, tmp_inode);
|
||||
|
||||
/*
|
||||
* Set the i_nlink to zero so that
|
||||
* generic_drop_inode really deletes the
|
||||
* inode
|
||||
*/
|
||||
tmp_inode->i_nlink = 0;
|
||||
|
||||
ext4_journal_stop(handle);
|
||||
|
||||
up_write(&EXT4_I(inode)->i_data_sem);
|
||||
|
||||
if (tmp_inode)
|
||||
iput(tmp_inode);
|
||||
|
||||
return retval;
|
||||
}
|
||||
@ -243,6 +243,7 @@ struct ext4_new_group_data {
|
||||
#endif
|
||||
#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
|
||||
#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
|
||||
#define EXT4_IOC_MIGRATE _IO('f', 7)
|
||||
|
||||
/*
|
||||
* ioctl commands in 32 bit emulation
|
||||
@ -983,6 +984,9 @@ extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
|
||||
unsigned long);
|
||||
extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
|
||||
|
||||
/* migrate.c */
|
||||
extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
|
||||
unsigned long);
|
||||
/* namei.c */
|
||||
extern int ext4_orphan_add(handle_t *, struct inode *);
|
||||
extern int ext4_orphan_del(handle_t *, struct inode *);
|
||||
|
||||
@ -212,6 +212,8 @@ static inline int ext4_ext_get_actual_len(struct ext4_extent *ext)
|
||||
(le16_to_cpu(ext->ee_len) - EXT_INIT_MAX_LEN));
|
||||
}
|
||||
|
||||
extern ext4_fsblk_t idx_pblock(struct ext4_extent_idx *);
|
||||
extern void ext4_ext_store_pblock(struct ext4_extent *, ext4_fsblk_t);
|
||||
extern int ext4_extent_tree_init(handle_t *, struct inode *);
|
||||
extern int ext4_ext_calc_credits_for_insert(struct inode *, struct ext4_ext_path *);
|
||||
extern int ext4_ext_try_to_merge(struct inode *inode,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user