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ext4: online defrag -- Add EXT4_IOC_MOVE_EXT ioctl

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The EXT4_IOC_MOVE_EXT exchanges the blocks between orig_fd and donor_fd,
and then write the file data of orig_fd to donor_fd.
ext4_mext_move_extent() is the main fucntion of ext4 online defrag,
and this patch includes all functions related to ext4 online defrag.

Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com>
Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Akira Fujita
2009-06-17 19:24:03 -04:00
committed by Theodore Ts'o
parent 8b0f9e8f78
commit 748de6736c
6 changed files with 1378 additions and 3 deletions
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36
fs/ext4/ioctl.c
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@@ -14,6 +14,7 @@
#include <linux/compat.h>
#include <linux/smp_lock.h>
#include <linux/mount.h>
#include <linux/file.h>
#include <asm/uaccess.h>
#include "ext4_jbd2.h"
#include "ext4.h"
@@ -213,6 +214,41 @@ setversion_out:
return err;
}
case EXT4_IOC_MOVE_EXT: {
struct move_extent me;
struct file *donor_filp;
int err;
if (copy_from_user(&me,
(struct move_extent __user *)arg, sizeof(me)))
return -EFAULT;
donor_filp = fget(me.donor_fd);
if (!donor_filp)
return -EBADF;
if (!capable(CAP_DAC_OVERRIDE)) {
if ((current->real_cred->fsuid != inode->i_uid) ||
!(inode->i_mode & S_IRUSR) ||
!(donor_filp->f_dentry->d_inode->i_mode &
S_IRUSR)) {
fput(donor_filp);
return -EACCES;
}
}
err = ext4_move_extents(filp, donor_filp, me.orig_start,
me.donor_start, me.len, &me.moved_len);
fput(donor_filp);
if (!err)
if (copy_to_user((struct move_extent *)arg,
&me, sizeof(me)))
return -EFAULT;
return err;
}
case EXT4_IOC_GROUP_ADD: {
struct ext4_new_group_data input;
struct super_block *sb = inode->i_sb;