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author | Akira Fujita <a-fujita@rs.jp.nec.com> | 2009-06-17 19:24:03 -0400 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2009-06-17 19:24:03 -0400 |
commit | 748de6736c1e482e111f9d1b5a5d5b1787600cad (patch) | |
tree | 9e5bd6085cd0eea0453c2a8bbce1422f291f059f /fs/ext4/ioctl.c | |
parent | 8b0f9e8f78bd0a65fa001bf18f2c47eef2893a10 (diff) | |
download | linux-3.10-748de6736c1e482e111f9d1b5a5d5b1787600cad.tar.gz linux-3.10-748de6736c1e482e111f9d1b5a5d5b1787600cad.tar.bz2 linux-3.10-748de6736c1e482e111f9d1b5a5d5b1787600cad.zip |
ext4: online defrag -- Add EXT4_IOC_MOVE_EXT ioctl
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>
Diffstat (limited to 'fs/ext4/ioctl.c')
-rw-r--r-- | fs/ext4/ioctl.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 91e75f7a9e7..bb415408fdb 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -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; |