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fuse: fix copy_file_range() in the writeback case 

Prior to sending COPY_FILE_RANGE to userspace filesystem, we must flush all
dirty pages in both the source and destination files.

This patch adds the missing flush of the source file.

Tested on libfuse-3.5.0 with:

  libfuse/example/passthrough_ll /mnt/fuse/ -o writeback
  libfuse/test/test_syscalls /mnt/fuse/tmp/test

Fixes: 88bc7d5097 ("fuse: add support for copy_file_range()")
Cc: <stable@vger.kernel.org> # v4.20
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2019-05-28 13:22:50 +02:00
parent 4a2abf99f9
commit a2bc923629
1 changed files with 12 additions and 0 deletions
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12
fs/fuse/file.c
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@ -3110,6 +3110,7 @@ static ssize_t fuse_copy_file_range(struct file *file_in, loff_t pos_in,
{
struct fuse_file *ff_in = file_in->private_data;
struct fuse_file *ff_out = file_out->private_data;
struct inode *inode_in = file_inode(file_in);
struct inode *inode_out = file_inode(file_out);
struct fuse_inode *fi_out = get_fuse_inode(inode_out);
struct fuse_conn *fc = ff_in->fc;
@ -3133,6 +3134,17 @@ static ssize_t fuse_copy_file_range(struct file *file_in, loff_t pos_in,
if (fc->no_copy_file_range)
return -EOPNOTSUPP;
if (fc->writeback_cache) {
inode_lock(inode_in);
err = filemap_write_and_wait_range(inode_in->i_mapping,
pos_in, pos_in + len);
if (!err)
fuse_sync_writes(inode_in);
inode_unlock(inode_in);
if (err)
return err;
}
inode_lock(inode_out);
if (fc->writeback_cache) {