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nfs42: add NFS_IOC_CLONE ioctl
It can be called by user space to CLONE two files. Follow btrfs lead and define NFS_IOC_CLONE same as BTRFS_IOC_CLONE. Thus we don't mess up userspace with too many ioctls. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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2 changed files with 106 additions and 0 deletions
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@ -4,6 +4,7 @@
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* Copyright (C) 1992 Rick Sladkey
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*/
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/falloc.h>
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#include <linux/nfs_fs.h>
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#include "delegation.h"
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@ -192,8 +193,104 @@ static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t
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return nfs42_proc_deallocate(filep, offset, len);
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return nfs42_proc_allocate(filep, offset, len);
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}
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static noinline long
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nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd,
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u64 src_off, u64 dst_off, u64 count)
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{
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struct inode *dst_inode = file_inode(dst_file);
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struct fd src_file;
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struct inode *src_inode;
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int ret;
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/* dst file must be opened for writing */
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if (!(dst_file->f_mode & FMODE_WRITE))
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return -EINVAL;
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ret = mnt_want_write_file(dst_file);
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if (ret)
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return ret;
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src_file = fdget(srcfd);
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if (!src_file.file) {
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ret = -EBADF;
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goto out_drop_write;
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}
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src_inode = file_inode(src_file.file);
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/* src and dst must be different files */
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ret = -EINVAL;
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if (src_inode == dst_inode)
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goto out_fput;
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/* src file must be opened for reading */
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if (!(src_file.file->f_mode & FMODE_READ))
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goto out_fput;
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/* src and dst must be regular files */
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ret = -EISDIR;
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if (!S_ISREG(src_inode->i_mode) || !S_ISREG(dst_inode->i_mode))
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goto out_fput;
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ret = -EXDEV;
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if (src_file.file->f_path.mnt != dst_file->f_path.mnt ||
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src_inode->i_sb != dst_inode->i_sb)
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goto out_fput;
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/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
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if (dst_inode < src_inode) {
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mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_PARENT);
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mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
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} else {
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mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
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mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_CHILD);
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}
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/* flush all pending writes on both src and dst so that server
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* has the latest data */
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ret = nfs_sync_inode(src_inode);
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if (ret)
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goto out_unlock;
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ret = nfs_sync_inode(dst_inode);
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if (ret)
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goto out_unlock;
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ret = nfs42_proc_clone(src_file.file, dst_file, src_off, dst_off, count);
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/* truncate inode page cache of the dst range so that future reads can fetch
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* new data from server */
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if (!ret)
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truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
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out_unlock:
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if (dst_inode < src_inode) {
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mutex_unlock(&src_inode->i_mutex);
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mutex_unlock(&dst_inode->i_mutex);
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} else {
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mutex_unlock(&dst_inode->i_mutex);
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mutex_unlock(&src_inode->i_mutex);
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}
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out_fput:
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fdput(src_file);
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out_drop_write:
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mnt_drop_write_file(dst_file);
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return ret;
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}
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#endif /* CONFIG_NFS_V4_2 */
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long nfs4_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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switch (cmd) {
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#ifdef CONFIG_NFS_V4_2
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case NFS_IOC_CLONE:
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return nfs42_ioctl_clone(file, arg, 0, 0, 0);
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#endif
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}
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return -ENOTTY;
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}
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const struct file_operations nfs4_file_operations = {
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#ifdef CONFIG_NFS_V4_2
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.llseek = nfs4_file_llseek,
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@ -216,4 +313,9 @@ const struct file_operations nfs4_file_operations = {
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#endif /* CONFIG_NFS_V4_2 */
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.check_flags = nfs_check_flags,
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.setlease = simple_nosetlease,
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#ifdef CONFIG_COMPAT
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.unlocked_ioctl = nfs4_ioctl,
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#else
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.compat_ioctl = nfs4_ioctl,
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#endif /* CONFIG_COMPAT */
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};
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@ -31,6 +31,10 @@
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#define NFS_PIPE_DIRNAME "nfs"
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/* NFS ioctls */
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/* Let's follow btrfs lead on CLONE to avoid messing userspace */
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#define NFS_IOC_CLONE _IOW(0x94, 9, int)
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/*
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* NFS stats. The good thing with these values is that NFSv3 errors are
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* a superset of NFSv2 errors (with the exception of NFSERR_WFLUSH which
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