int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
{
struct the_nilfs *nilfs;
int ret;
nilfs = NILFS_MDT(cpfile)->mi_nilfs;
switch (mode) {
case NILFS_CHECKPOINT:
/*
* Check for protecting existing snapshot mounts:
* ns_mount_mutex is used to make this operation atomic and
* exclusive with a new mount job. Though it doesn't cover
* umount, it's enough for the purpose.
*/
if (nilfs_checkpoint_is_mounted(nilfs, cno, 1)) {
/* Current implementation does not have to protect
plain read-only mounts since they are exclusive
with a read/write mount and are protected from the
cleaner. */
ret = -EBUSY;
} else
ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
return ret;
case NILFS_SNAPSHOT:
return nilfs_cpfile_set_snapshot(cpfile, cno);
default:
return -EINVAL;
}
}
int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
{
int ret;
switch (mode) {
case NILFS_CHECKPOINT:
if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno))
ret = -EBUSY;
else
ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
return ret;
case NILFS_SNAPSHOT:
return nilfs_cpfile_set_snapshot(cpfile, cno);
default:
return -EINVAL;
}
}
/**
* nilfs_cpfile_change_cpmode - change checkpoint mode
* @cpfile: inode of checkpoint file
* @cno: checkpoint number
* @status: mode of checkpoint
*
* Description: nilfs_change_cpmode() changes the mode of the checkpoint
* specified by @cno. The mode @mode is NILFS_CHECKPOINT or NILFS_SNAPSHOT.
*
* Return Value: On success, 0 is returned. On error, one of the following
* negative error codes is returned.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-ENOENT - No such checkpoint.
*/
int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
{
int ret;
switch (mode) {
case NILFS_CHECKPOINT:
if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno))
/*
* Current implementation does not have to protect
* plain read-only mounts since they are exclusive
* with a read/write mount and are protected from the
* cleaner.
*/
ret = -EBUSY;
else
ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
return ret;
case NILFS_SNAPSHOT:
return nilfs_cpfile_set_snapshot(cpfile, cno);
default:
return -EINVAL;
}
}
