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ocfs2: implement the VFS clone_range, copy_range, and dedupe_range features

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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.
This commit is contained in:
Darrick J. Wong
2016-11-09 14:13:11 -08:00
parent 86e59436d4
commit 29ac8e856c
4 changed files with 474 additions and 3 deletions
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35
fs/ocfs2/file.c
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@@ -1667,9 +1667,9 @@ static void ocfs2_calc_trunc_pos(struct inode *inode,
*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 @@ out:
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 @@ const struct file_operations ocfs2_fops = {
.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 @@ const struct file_operations ocfs2_fops_no_plocks = {
.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 = {