This patch hooks the ext3 to ext4 migrate interface to
EXT4_IOC_SETFLAGS ioctl. The userspace interface is via chattr +e. We
only allow setting extent flags. Clearing extent flag (migrating from
ext4 to ext3) is not supported.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
-#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
+#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
/*
* Inode dynamic state flags
/*
* Inode dynamic state flags
return put_user(flags, (int __user *) arg);
case EXT4_IOC_SETFLAGS: {
handle_t *handle = NULL;
return put_user(flags, (int __user *) arg);
case EXT4_IOC_SETFLAGS: {
handle_t *handle = NULL;
struct ext4_iloc iloc;
unsigned int oldflags;
unsigned int jflag;
struct ext4_iloc iloc;
unsigned int oldflags;
unsigned int jflag;
if (!capable(CAP_SYS_RESOURCE))
goto flags_out;
}
if (!capable(CAP_SYS_RESOURCE))
goto flags_out;
}
+ if (oldflags & EXT4_EXTENTS_FL) {
+ /* We don't support clearning extent flags */
+ if (!(flags & EXT4_EXTENTS_FL)) {
+ err = -EOPNOTSUPP;
+ goto flags_out;
+ }
+ } else if (flags & EXT4_EXTENTS_FL) {
+ /* migrate the file */
+ migrate = 1;
+ flags &= ~EXT4_EXTENTS_FL;
+ }
handle = ext4_journal_start(inode, 1);
if (IS_ERR(handle)) {
handle = ext4_journal_start(inode, 1);
if (IS_ERR(handle)) {
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
err = ext4_change_inode_journal_flag(inode, jflag);
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
err = ext4_change_inode_journal_flag(inode, jflag);
+ if (err)
+ goto flags_out;
+ if (migrate)
+ err = ext4_ext_migrate(inode);
flags_out:
mutex_unlock(&inode->i_mutex);
mnt_drop_write(filp->f_path.mnt);
flags_out:
mutex_unlock(&inode->i_mutex);
mnt_drop_write(filp->f_path.mnt);