xfs: merge xfs_reflink_remap_range and xfs_file_share_range
There is no clear division of responsibility between those functions, so
just merge them into one to keep the code simple. Also move
xfs_file_wait_for_io to xfs_reflink.c together with its only caller.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 9372975..6e4f7f9 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -909,132 +909,6 @@ xfs_file_fallocate(
return error;
}
-/* Hook up to the VFS reflink function */
-STATIC int
-xfs_file_share_range(
- struct file *file_in,
- loff_t pos_in,
- struct file *file_out,
- loff_t pos_out,
- u64 len,
- bool is_dedupe)
-{
- struct inode *inode_in;
- struct inode *inode_out;
- ssize_t ret;
- loff_t bs;
- loff_t isize;
- int same_inode;
- loff_t blen;
- unsigned int flags = 0;
-
- inode_in = file_inode(file_in);
- inode_out = file_inode(file_out);
- bs = inode_out->i_sb->s_blocksize;
-
- /* Lock both files against IO */
- same_inode = (inode_in == inode_out);
- if (same_inode) {
- xfs_ilock(XFS_I(inode_in), XFS_IOLOCK_EXCL);
- xfs_ilock(XFS_I(inode_in), XFS_MMAPLOCK_EXCL);
- } else {
- xfs_lock_two_inodes(XFS_I(inode_in), XFS_I(inode_out),
- XFS_IOLOCK_EXCL);
- xfs_lock_two_inodes(XFS_I(inode_in), XFS_I(inode_out),
- XFS_MMAPLOCK_EXCL);
- }
-
- /* Don't touch certain kinds of inodes */
- ret = -EPERM;
- if (IS_IMMUTABLE(inode_out))
- goto out_unlock;
- ret = -ETXTBSY;
- if (IS_SWAPFILE(inode_in) || IS_SWAPFILE(inode_out))
- goto out_unlock;
-
- /* Don't reflink dirs, pipes, sockets... */
- ret = -EISDIR;
- if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
- goto out_unlock;
- ret = -EINVAL;
- if (S_ISFIFO(inode_in->i_mode) || S_ISFIFO(inode_out->i_mode))
- goto out_unlock;
- if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
- goto out_unlock;
-
- /* Don't share DAX file data for now. */
- if (IS_DAX(inode_in) || IS_DAX(inode_out))
- goto out_unlock;
-
- /* Are we going all the way to the end? */
- isize = i_size_read(inode_in);
- if (isize == 0) {
- ret = 0;
- goto out_unlock;
- }
-
- if (len == 0)
- len = isize - pos_in;
-
- /* Ensure offsets don't wrap and the input is inside i_size */
- if (pos_in + len < pos_in || pos_out + len < pos_out ||
- pos_in + len > isize)
- goto out_unlock;
-
- /* Don't allow dedupe past EOF in the dest file */
- if (is_dedupe) {
- loff_t disize;
-
- disize = i_size_read(inode_out);
- if (pos_out >= disize || pos_out + len > disize)
- goto out_unlock;
- }
-
- /* If we're linking to EOF, continue to the block boundary. */
- if (pos_in + len == isize)
- blen = ALIGN(isize, bs) - pos_in;
- else
- blen = len;
-
- /* Only reflink if we're aligned to block boundaries */
- if (!IS_ALIGNED(pos_in, bs) || !IS_ALIGNED(pos_in + blen, bs) ||
- !IS_ALIGNED(pos_out, bs) || !IS_ALIGNED(pos_out + blen, bs))
- goto out_unlock;
-
- /* Don't allow overlapped reflink within the same file */
- if (same_inode && pos_out + blen > pos_in && pos_out < pos_in + blen)
- goto out_unlock;
-
- /* Wait for the completion of any pending IOs on both files */
- inode_dio_wait(inode_in);
- if (!same_inode)
- inode_dio_wait(inode_out);
-
- ret = filemap_write_and_wait_range(inode_in->i_mapping,
- pos_in, pos_in + len - 1);
- if (ret)
- goto out_unlock;
-
- ret = filemap_write_and_wait_range(inode_out->i_mapping,
- pos_out, pos_out + len - 1);
- if (ret)
- goto out_unlock;
-
- if (is_dedupe)
- flags |= XFS_REFLINK_DEDUPE;
- ret = xfs_reflink_remap_range(XFS_I(inode_in), pos_in, XFS_I(inode_out),
- pos_out, len, flags);
-
-out_unlock:
- xfs_iunlock(XFS_I(inode_in), XFS_MMAPLOCK_EXCL);
- xfs_iunlock(XFS_I(inode_in), XFS_IOLOCK_EXCL);
- if (!same_inode) {
- xfs_iunlock(XFS_I(inode_out), XFS_MMAPLOCK_EXCL);
- xfs_iunlock(XFS_I(inode_out), XFS_IOLOCK_EXCL);
- }
- return ret;
-}
-
STATIC ssize_t
xfs_file_copy_range(
struct file *file_in,
@@ -1046,7 +920,7 @@ xfs_file_copy_range(
{
int error;
- error = xfs_file_share_range(file_in, pos_in, file_out, pos_out,
+ error = xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
len, false);
if (error)
return error;
@@ -1061,7 +935,7 @@ xfs_file_clone_range(
loff_t pos_out,
u64 len)
{
- return xfs_file_share_range(file_in, pos_in, file_out, pos_out,
+ return xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
len, false);
}
@@ -1084,7 +958,7 @@ xfs_file_dedupe_range(
if (len > XFS_MAX_DEDUPE_LEN)
len = XFS_MAX_DEDUPE_LEN;
- error = xfs_file_share_range(src_file, loff, dst_file, dst_loff,
+ error = xfs_reflink_remap_range(src_file, loff, dst_file, dst_loff,
len, true);
if (error)
return error;
