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linux: implement filesystem-side clone ioctls

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Prior to Linux 4.5, the FICLONE etc ioctls were specific to BTRFS, and
were implemented as regular filesystem-specific ioctls. This implements
those ioctls directly in OpenZFS, allowing cloning to work on older
kernels.

There's no need to gate these behind version checks; on later kernels
Linux will simply never deliver these ioctls, instead calling the
approprate VFS op.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Kay Pedersen <mail@mkwg.de>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-By: OpenDrives Inc.
Sponsored-By: Klara Inc.
Closes #15050
This commit is contained in:
Rob Norris
2023-06-27 23:45:00 +10:00
committed by Brian Behlendorf
parent 5a35c68b67
commit 9927f219f1
3 changed files with 120 additions and 0 deletions
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module/os/linux/zfs/zpl_file.c
+6
View File
@@ -1257,6 +1257,12 @@ zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return (zpl_ioctl_getdosflags(filp, (void *)arg));
case ZFS_IOC_SETDOSFLAGS:
return (zpl_ioctl_setdosflags(filp, (void *)arg));
case ZFS_IOC_COMPAT_FICLONE:
return (zpl_ioctl_ficlone(filp, (void *)arg));
case ZFS_IOC_COMPAT_FICLONERANGE:
return (zpl_ioctl_ficlonerange(filp, (void *)arg));
case ZFS_IOC_COMPAT_FIDEDUPERANGE:
return (zpl_ioctl_fideduperange(filp, (void *)arg));
default:
return (-ENOTTY);
}