vfs: pull btrfs clone API to vfs layer
The btrfs clone ioctls are now adopted by other file systems, with NFS
and CIFS already having support for them, and XFS being under active
development. To avoid growth of various slightly incompatible
implementations, add one to the VFS. Note that clones are different from
file copies in several ways:
- they are atomic vs other writers
- they support whole file clones
- they support 64-bit legth clones
- they do not allow partial success (aka short writes)
- clones are expected to be a fast metadata operation
Because of that it would be rather cumbersome to try to piggyback them on
top of the recent clone_file_range infrastructure. The converse isn't
true and the clone_file_range system call could try clone file range as
a first attempt to copy, something that further patches will enable.
Based on earlier work from Peng Tao.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ede7277..dd4733f 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -4025,7 +4025,6 @@
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
struct btrfs_ioctl_balance_args *bargs);
-
/* file.c */
int btrfs_auto_defrag_init(void);
void btrfs_auto_defrag_exit(void);
@@ -4058,6 +4057,8 @@
ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out,
size_t len, unsigned int flags);
+int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out, u64 len);
/* tree-defrag.c */
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index e67fe6a..232e300 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2925,6 +2925,7 @@
.compat_ioctl = btrfs_ioctl,
#endif
.copy_file_range = btrfs_copy_file_range,
+ .clone_file_range = btrfs_clone_file_range,
};
void btrfs_auto_defrag_exit(void)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0f92735..85b1cae 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3906,49 +3906,10 @@
return ret;
}
-static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
- u64 off, u64 olen, u64 destoff)
+int btrfs_clone_file_range(struct file *src_file, loff_t off,
+ struct file *dst_file, loff_t destoff, u64 len)
{
- struct fd src_file;
- int ret;
-
- /* the destination must be opened for writing */
- if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
- return -EINVAL;
-
- ret = mnt_want_write_file(file);
- if (ret)
- return ret;
-
- src_file = fdget(srcfd);
- if (!src_file.file) {
- ret = -EBADF;
- goto out_drop_write;
- }
-
- /* the src must be open for reading */
- if (!(src_file.file->f_mode & FMODE_READ)) {
- ret = -EINVAL;
- goto out_fput;
- }
-
- ret = btrfs_clone_files(file, src_file.file, off, olen, destoff);
-
-out_fput:
- fdput(src_file);
-out_drop_write:
- mnt_drop_write_file(file);
- return ret;
-}
-
-static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
-{
- struct btrfs_ioctl_clone_range_args args;
-
- if (copy_from_user(&args, argp, sizeof(args)))
- return -EFAULT;
- return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
- args.src_length, args.dest_offset);
+ return btrfs_clone_files(dst_file, src_file, off, len, destoff);
}
/*
@@ -5498,10 +5459,6 @@
return btrfs_ioctl_dev_info(root, argp);
case BTRFS_IOC_BALANCE:
return btrfs_ioctl_balance(file, NULL);
- case BTRFS_IOC_CLONE:
- return btrfs_ioctl_clone(file, arg, 0, 0, 0);
- case BTRFS_IOC_CLONE_RANGE:
- return btrfs_ioctl_clone_range(file, argp);
case BTRFS_IOC_TRANS_START:
return btrfs_ioctl_trans_start(file);
case BTRFS_IOC_TRANS_END:
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index cbc0f4b..e9b978f 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -914,6 +914,61 @@
#endif
};
+static int cifs_clone_file_range(struct file *src_file, loff_t off,
+ struct file *dst_file, loff_t destoff, u64 len)
+{
+ struct inode *src_inode = file_inode(src_file);
+ struct inode *target_inode = file_inode(dst_file);
+ struct cifsFileInfo *smb_file_src = src_file->private_data;
+ struct cifsFileInfo *smb_file_target = dst_file->private_data;
+ struct cifs_tcon *src_tcon = tlink_tcon(smb_file_src->tlink);
+ struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
+ unsigned int xid;
+ int rc;
+
+ cifs_dbg(FYI, "clone range\n");
+
+ xid = get_xid();
+
+ if (!src_file->private_data || !dst_file->private_data) {
+ rc = -EBADF;
+ cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
+ goto out;
+ }
+
+ /*
+ * Note: cifs case is easier than btrfs since server responsible for
+ * checks for proper open modes and file type and if it wants
+ * server could even support copy of range where source = target
+ */
+ lock_two_nondirectories(target_inode, src_inode);
+
+ if (len == 0)
+ len = src_inode->i_size - off;
+
+ cifs_dbg(FYI, "about to flush pages\n");
+ /* should we flush first and last page first */
+ truncate_inode_pages_range(&target_inode->i_data, destoff,
+ PAGE_CACHE_ALIGN(destoff + len)-1);
+
+ if (target_tcon->ses->server->ops->duplicate_extents)
+ rc = target_tcon->ses->server->ops->duplicate_extents(xid,
+ smb_file_src, smb_file_target, off, len, destoff);
+ else
+ rc = -EOPNOTSUPP;
+
+ /* force revalidate of size and timestamps of target file now
+ that target is updated on the server */
+ CIFS_I(target_inode)->time = 0;
+out_unlock:
+ /* although unlocking in the reverse order from locking is not
+ strictly necessary here it is a little cleaner to be consistent */
+ unlock_two_nondirectories(src_inode, target_inode);
+out:
+ free_xid(xid);
+ return rc;
+}
+
const struct file_operations cifs_file_ops = {
.read_iter = cifs_loose_read_iter,
.write_iter = cifs_file_write_iter,
@@ -926,6 +981,7 @@
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
+ .clone_file_range = cifs_clone_file_range,
.setlease = cifs_setlease,
.fallocate = cifs_fallocate,
};
@@ -942,6 +998,8 @@
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
+ .clone_file_range = cifs_clone_file_range,
+ .clone_file_range = cifs_clone_file_range,
.setlease = cifs_setlease,
.fallocate = cifs_fallocate,
};
@@ -958,6 +1016,7 @@
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.unlocked_ioctl = cifs_ioctl,
+ .clone_file_range = cifs_clone_file_range,
.llseek = cifs_llseek,
.setlease = cifs_setlease,
.fallocate = cifs_fallocate,
@@ -974,6 +1033,7 @@
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
+ .clone_file_range = cifs_clone_file_range,
.setlease = cifs_setlease,
.fallocate = cifs_fallocate,
};
@@ -989,6 +1049,7 @@
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
+ .clone_file_range = cifs_clone_file_range,
.setlease = cifs_setlease,
.fallocate = cifs_fallocate,
};
@@ -1004,6 +1065,7 @@
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.unlocked_ioctl = cifs_ioctl,
+ .clone_file_range = cifs_clone_file_range,
.llseek = cifs_llseek,
.setlease = cifs_setlease,
.fallocate = cifs_fallocate,
@@ -1014,6 +1076,7 @@
.release = cifs_closedir,
.read = generic_read_dir,
.unlocked_ioctl = cifs_ioctl,
+ .clone_file_range = cifs_clone_file_range,
.llseek = generic_file_llseek,
};
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index c3cc160..c399513 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -131,7 +131,6 @@
extern ssize_t cifs_getxattr(struct dentry *, const char *, void *, size_t);
extern ssize_t cifs_listxattr(struct dentry *, char *, size_t);
extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
-
#ifdef CONFIG_CIFS_NFSD_EXPORT
extern const struct export_operations cifs_export_ops;
#endif /* CONFIG_CIFS_NFSD_EXPORT */
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 35cf990..7a3b84e 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -34,18 +34,69 @@
#include "cifs_ioctl.h"
#include <linux/btrfs.h>
+static int cifs_file_clone_range(unsigned int xid, struct file *src_file,
+ struct file *dst_file)
+{
+ struct inode *src_inode = file_inode(src_file);
+ struct inode *target_inode = file_inode(dst_file);
+ struct cifsFileInfo *smb_file_src;
+ struct cifsFileInfo *smb_file_target;
+ struct cifs_tcon *src_tcon;
+ struct cifs_tcon *target_tcon;
+ int rc;
+
+ cifs_dbg(FYI, "ioctl clone range\n");
+
+ if (!src_file->private_data || !dst_file->private_data) {
+ rc = -EBADF;
+ cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
+ goto out;
+ }
+
+ rc = -EXDEV;
+ smb_file_target = dst_file->private_data;
+ smb_file_src = src_file->private_data;
+ src_tcon = tlink_tcon(smb_file_src->tlink);
+ target_tcon = tlink_tcon(smb_file_target->tlink);
+
+ if (src_tcon->ses != target_tcon->ses) {
+ cifs_dbg(VFS, "source and target of copy not on same server\n");
+ goto out;
+ }
+
+ /*
+ * Note: cifs case is easier than btrfs since server responsible for
+ * checks for proper open modes and file type and if it wants
+ * server could even support copy of range where source = target
+ */
+ lock_two_nondirectories(target_inode, src_inode);
+
+ cifs_dbg(FYI, "about to flush pages\n");
+ /* should we flush first and last page first */
+ truncate_inode_pages(&target_inode->i_data, 0);
+
+ if (target_tcon->ses->server->ops->clone_range)
+ rc = target_tcon->ses->server->ops->clone_range(xid,
+ smb_file_src, smb_file_target, 0, src_inode->i_size, 0);
+ else
+ rc = -EOPNOTSUPP;
+
+ /* force revalidate of size and timestamps of target file now
+ that target is updated on the server */
+ CIFS_I(target_inode)->time = 0;
+ /* although unlocking in the reverse order from locking is not
+ strictly necessary here it is a little cleaner to be consistent */
+ unlock_two_nondirectories(src_inode, target_inode);
+out:
+ return rc;
+}
+
static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
- unsigned long srcfd, u64 off, u64 len, u64 destoff,
- bool dup_extents)
+ unsigned long srcfd)
{
int rc;
- struct cifsFileInfo *smb_file_target = dst_file->private_data;
- struct inode *target_inode = file_inode(dst_file);
- struct cifs_tcon *target_tcon;
struct fd src_file;
- struct cifsFileInfo *smb_file_src;
struct inode *src_inode;
- struct cifs_tcon *src_tcon;
cifs_dbg(FYI, "ioctl clone range\n");
/* the destination must be opened for writing */
@@ -73,69 +124,13 @@
goto out_fput;
}
- if ((!src_file.file->private_data) || (!dst_file->private_data)) {
- rc = -EBADF;
- cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
- goto out_fput;
- }
-
- rc = -EXDEV;
- smb_file_target = dst_file->private_data;
- smb_file_src = src_file.file->private_data;
- src_tcon = tlink_tcon(smb_file_src->tlink);
- target_tcon = tlink_tcon(smb_file_target->tlink);
-
- /* check source and target on same server (or volume if dup_extents) */
- if (dup_extents && (src_tcon != target_tcon)) {
- cifs_dbg(VFS, "source and target of copy not on same share\n");
- goto out_fput;
- }
-
- if (!dup_extents && (src_tcon->ses != target_tcon->ses)) {
- cifs_dbg(VFS, "source and target of copy not on same server\n");
- goto out_fput;
- }
-
src_inode = file_inode(src_file.file);
rc = -EINVAL;
if (S_ISDIR(src_inode->i_mode))
goto out_fput;
- /*
- * Note: cifs case is easier than btrfs since server responsible for
- * checks for proper open modes and file type and if it wants
- * server could even support copy of range where source = target
- */
- lock_two_nondirectories(target_inode, src_inode);
+ rc = cifs_file_clone_range(xid, src_file.file, dst_file);
- /* determine range to clone */
- rc = -EINVAL;
- if (off + len > src_inode->i_size || off + len < off)
- goto out_unlock;
- if (len == 0)
- len = src_inode->i_size - off;
-
- cifs_dbg(FYI, "about to flush pages\n");
- /* should we flush first and last page first */
- truncate_inode_pages_range(&target_inode->i_data, destoff,
- PAGE_CACHE_ALIGN(destoff + len)-1);
-
- if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
- rc = target_tcon->ses->server->ops->duplicate_extents(xid,
- smb_file_src, smb_file_target, off, len, destoff);
- else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
- rc = target_tcon->ses->server->ops->clone_range(xid,
- smb_file_src, smb_file_target, off, len, destoff);
- else
- rc = -EOPNOTSUPP;
-
- /* force revalidate of size and timestamps of target file now
- that target is updated on the server */
- CIFS_I(target_inode)->time = 0;
-out_unlock:
- /* although unlocking in the reverse order from locking is not
- strictly necessary here it is a little cleaner to be consistent */
- unlock_two_nondirectories(src_inode, target_inode);
out_fput:
fdput(src_file);
out_drop_write:
@@ -256,10 +251,7 @@
}
break;
case CIFS_IOC_COPYCHUNK_FILE:
- rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
- break;
- case BTRFS_IOC_CLONE:
- rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
+ rc = cifs_ioctl_clone(xid, filep, arg);
break;
case CIFS_IOC_SET_INTEGRITY:
if (pSMBFile == NULL)
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 5d01d26..84c6e79 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -215,6 +215,29 @@
return error;
}
+static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
+ u64 off, u64 olen, u64 destoff)
+{
+ struct fd src_file = fdget(srcfd);
+ int ret;
+
+ if (!src_file.file)
+ return -EBADF;
+ ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
+ fdput(src_file);
+ return ret;
+}
+
+static long ioctl_file_clone_range(struct file *file, void __user *argp)
+{
+ struct file_clone_range args;
+
+ if (copy_from_user(&args, argp, sizeof(args)))
+ return -EFAULT;
+ return ioctl_file_clone(file, args.src_fd, args.src_offset,
+ args.src_length, args.dest_offset);
+}
+
#ifdef CONFIG_BLOCK
static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
@@ -600,6 +623,12 @@
case FIGETBSZ:
return put_user(inode->i_sb->s_blocksize, argp);
+ case FICLONE:
+ return ioctl_file_clone(filp, arg, 0, 0, 0);
+
+ case FICLONERANGE:
+ return ioctl_file_clone_range(filp, argp);
+
default:
if (S_ISREG(inode->i_mode))
error = file_ioctl(filp, cmd, arg);
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index db9b5fe..26f9a23 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -195,65 +195,27 @@
return nfs42_proc_allocate(filep, offset, len);
}
-static noinline long
-nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd,
- u64 src_off, u64 dst_off, u64 count)
+static int nfs42_clone_file_range(struct file *src_file, loff_t src_off,
+ struct file *dst_file, loff_t dst_off, u64 count)
{
struct inode *dst_inode = file_inode(dst_file);
struct nfs_server *server = NFS_SERVER(dst_inode);
- struct fd src_file;
- struct inode *src_inode;
+ struct inode *src_inode = file_inode(src_file);
unsigned int bs = server->clone_blksize;
bool same_inode = false;
int ret;
- /* dst file must be opened for writing */
- if (!(dst_file->f_mode & FMODE_WRITE))
- return -EINVAL;
-
- ret = mnt_want_write_file(dst_file);
- if (ret)
- return ret;
-
- src_file = fdget(srcfd);
- if (!src_file.file) {
- ret = -EBADF;
- goto out_drop_write;
- }
-
- src_inode = file_inode(src_file.file);
-
- if (src_inode == dst_inode)
- same_inode = true;
-
- /* src file must be opened for reading */
- if (!(src_file.file->f_mode & FMODE_READ))
- goto out_fput;
-
- /* src and dst must be regular files */
- ret = -EISDIR;
- if (!S_ISREG(src_inode->i_mode) || !S_ISREG(dst_inode->i_mode))
- goto out_fput;
-
- ret = -EXDEV;
- if (src_file.file->f_path.mnt != dst_file->f_path.mnt ||
- src_inode->i_sb != dst_inode->i_sb)
- goto out_fput;
-
/* check alignment w.r.t. clone_blksize */
ret = -EINVAL;
if (bs) {
if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
- goto out_fput;
+ goto out;
if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
- goto out_fput;
+ goto out;
}
- /* verify if ranges are overlapped within the same file */
- if (same_inode) {
- if (dst_off + count > src_off && dst_off < src_off + count)
- goto out_fput;
- }
+ if (src_inode == dst_inode)
+ same_inode = true;
/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
if (same_inode) {
@@ -275,7 +237,7 @@
if (ret)
goto out_unlock;
- ret = nfs42_proc_clone(src_file.file, dst_file, src_off, dst_off, count);
+ ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
/* truncate inode page cache of the dst range so that future reads can fetch
* new data from server */
@@ -292,37 +254,9 @@
mutex_unlock(&dst_inode->i_mutex);
mutex_unlock(&src_inode->i_mutex);
}
-out_fput:
- fdput(src_file);
-out_drop_write:
- mnt_drop_write_file(dst_file);
+out:
return ret;
}
-
-static long nfs42_ioctl_clone_range(struct file *dst_file, void __user *argp)
-{
- struct btrfs_ioctl_clone_range_args args;
-
- if (copy_from_user(&args, argp, sizeof(args)))
- return -EFAULT;
-
- return nfs42_ioctl_clone(dst_file, args.src_fd, args.src_offset,
- args.dest_offset, args.src_length);
-}
-
-long nfs4_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
-
- switch (cmd) {
- case BTRFS_IOC_CLONE:
- return nfs42_ioctl_clone(file, arg, 0, 0, 0);
- case BTRFS_IOC_CLONE_RANGE:
- return nfs42_ioctl_clone_range(file, argp);
- }
-
- return -ENOTTY;
-}
#endif /* CONFIG_NFS_V4_2 */
const struct file_operations nfs4_file_operations = {
@@ -342,8 +276,7 @@
#ifdef CONFIG_NFS_V4_2
.llseek = nfs4_file_llseek,
.fallocate = nfs42_fallocate,
- .unlocked_ioctl = nfs4_ioctl,
- .compat_ioctl = nfs4_ioctl,
+ .clone_file_range = nfs42_clone_file_range,
#else
.llseek = nfs_file_llseek,
#endif
diff --git a/fs/read_write.c b/fs/read_write.c
index 6cfad47..c75d02c 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1451,3 +1451,75 @@
out2:
return ret;
}
+
+static int clone_verify_area(struct file *file, loff_t pos, u64 len, bool write)
+{
+ struct inode *inode = file_inode(file);
+
+ if (unlikely(pos < 0))
+ return -EINVAL;
+
+ if (unlikely((loff_t) (pos + len) < 0))
+ return -EINVAL;
+
+ if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
+ loff_t end = len ? pos + len - 1 : OFFSET_MAX;
+ int retval;
+
+ retval = locks_mandatory_area(inode, file, pos, end,
+ write ? F_WRLCK : F_RDLCK);
+ if (retval < 0)
+ return retval;
+ }
+
+ return security_file_permission(file, write ? MAY_WRITE : MAY_READ);
+}
+
+int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out, u64 len)
+{
+ struct inode *inode_in = file_inode(file_in);
+ struct inode *inode_out = file_inode(file_out);
+ int ret;
+
+ if (inode_in->i_sb != inode_out->i_sb ||
+ file_in->f_path.mnt != file_out->f_path.mnt)
+ return -EXDEV;
+
+ if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
+ return -EISDIR;
+ if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
+ return -EOPNOTSUPP;
+
+ if (!(file_in->f_mode & FMODE_READ) ||
+ !(file_out->f_mode & FMODE_WRITE) ||
+ (file_out->f_flags & O_APPEND) ||
+ !file_in->f_op->clone_file_range)
+ return -EBADF;
+
+ ret = clone_verify_area(file_in, pos_in, len, false);
+ if (ret)
+ return ret;
+
+ ret = clone_verify_area(file_out, pos_out, len, true);
+ if (ret)
+ return ret;
+
+ if (pos_in + len > i_size_read(inode_in))
+ return -EINVAL;
+
+ ret = mnt_want_write_file(file_out);
+ if (ret)
+ return ret;
+
+ ret = file_in->f_op->clone_file_range(file_in, pos_in,
+ file_out, pos_out, len);
+ if (!ret) {
+ fsnotify_access(file_in);
+ fsnotify_modify(file_out);
+ }
+
+ mnt_drop_write_file(file_out);
+ return ret;
+}
+EXPORT_SYMBOL(vfs_clone_file_range);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4377b2d..5d987ae 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1629,7 +1629,10 @@
#ifndef CONFIG_MMU
unsigned (*mmap_capabilities)(struct file *);
#endif
- ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, loff_t, size_t, unsigned int);
+ ssize_t (*copy_file_range)(struct file *, loff_t, struct file *,
+ loff_t, size_t, unsigned int);
+ int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t,
+ u64);
};
struct inode_operations {
@@ -1683,6 +1686,8 @@
unsigned long, loff_t *);
extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
loff_t, size_t, unsigned int);
+extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out, u64 len);
struct super_operations {
struct inode *(*alloc_inode)(struct super_block *sb);
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index f15d980..cd5db7f 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -39,6 +39,13 @@
#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
#define RENAME_WHITEOUT (1 << 2) /* Whiteout source */
+struct file_clone_range {
+ __s64 src_fd;
+ __u64 src_offset;
+ __u64 src_length;
+ __u64 dest_offset;
+};
+
struct fstrim_range {
__u64 start;
__u64 len;
@@ -159,6 +166,8 @@
#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
#define FITHAW _IOWR('X', 120, int) /* Thaw */
#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
+#define FICLONE _IOW(0x94, 9, int)
+#define FICLONERANGE _IOW(0x94, 13, struct file_clone_range)
#define FS_IOC_GETFLAGS _IOR('f', 1, long)
#define FS_IOC_SETFLAGS _IOW('f', 2, long)