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xfs: merge xfs_reflink_remap_range and xfs_file_share_range

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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>
This commit is contained in:
Christoph Hellwig
2016-10-20 15:50:07 +11:00
committed by Dave Chinner
parent ec40759902
commit 5faaf4fa0a
3 changed files with 143 additions and 174 deletions
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132
fs/xfs/xfs_file.c
View File

@@ -909,132 +909,6 @@ out_unlock:
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;