ocfs2: implement the VFS clone_range, copy_range, and dedupe_range features
Connect the new VFS clone_range, copy_range, and dedupe_range features
to the existing reflink capability of ocfs2. Compared to the existing
ocfs2 reflink ioctl We have to do things a little differently to support
the VFS semantics (we can clone subranges of a file but we don't clone
xattrs), but the VFS ioctls are more broadly supported.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
v2: Convert inline data files to extents files before reflinking,
and fix i_blocks so that stat(2) output is correct.
v3: Make zero-length dedupe consistent with btrfs behavior.
v4: Use VFS double-inode lock routines and remove MAX_DEDUPE_LEN.
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index d261f3a..c488965 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1667,9 +1667,9 @@
*done = ret;
}
-static int ocfs2_remove_inode_range(struct inode *inode,
- struct buffer_head *di_bh, u64 byte_start,
- u64 byte_len)
+int ocfs2_remove_inode_range(struct inode *inode,
+ struct buffer_head *di_bh, u64 byte_start,
+ u64 byte_len)
{
int ret = 0, flags = 0, done = 0, i;
u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
@@ -2439,6 +2439,31 @@
return offset;
}
+static int ocfs2_file_clone_range(struct file *file_in,
+ loff_t pos_in,
+ struct file *file_out,
+ loff_t pos_out,
+ u64 len)
+{
+ return ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
+ len, false);
+}
+
+static ssize_t ocfs2_file_dedupe_range(struct file *src_file,
+ u64 loff,
+ u64 len,
+ struct file *dst_file,
+ u64 dst_loff)
+{
+ int error;
+
+ error = ocfs2_reflink_remap_range(src_file, loff, dst_file, dst_loff,
+ len, true);
+ if (error)
+ return error;
+ return len;
+}
+
const struct inode_operations ocfs2_file_iops = {
.setattr = ocfs2_setattr,
.getattr = ocfs2_getattr,
@@ -2478,6 +2503,8 @@
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = ocfs2_fallocate,
+ .clone_file_range = ocfs2_file_clone_range,
+ .dedupe_file_range = ocfs2_file_dedupe_range,
};
const struct file_operations ocfs2_dops = {
@@ -2523,6 +2550,8 @@
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = ocfs2_fallocate,
+ .clone_file_range = ocfs2_file_clone_range,
+ .dedupe_file_range = ocfs2_file_dedupe_range,
};
const struct file_operations ocfs2_dops_no_plocks = {