From: Miklos Szeredi mszeredi@redhat.com
[ Upstream commit 2c4656dfd994538176db30ce09c02cc0dfc361ae ]
a) Dirty cache needs to be written back not just in the writeback_cache case, since the dirty pages may come from memory maps.
b) The fuse_writeback_range() helper takes an inclusive interval, so the end position needs to be pos+len-1 instead of pos+len.
Fixes: 88bc7d5097a1 ("fuse: add support for copy_file_range()") Signed-off-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/fuse/file.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 713d55a61890..e730e3d8ad99 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -3280,13 +3280,11 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in, if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) return -EXDEV;
- if (fc->writeback_cache) { - inode_lock(inode_in); - err = fuse_writeback_range(inode_in, pos_in, pos_in + len); - inode_unlock(inode_in); - if (err) - return err; - } + inode_lock(inode_in); + err = fuse_writeback_range(inode_in, pos_in, pos_in + len - 1); + inode_unlock(inode_in); + if (err) + return err;
inode_lock(inode_out);
@@ -3294,11 +3292,9 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in, if (err) goto out;
- if (fc->writeback_cache) { - err = fuse_writeback_range(inode_out, pos_out, pos_out + len); - if (err) - goto out; - } + err = fuse_writeback_range(inode_out, pos_out, pos_out + len - 1); + if (err) + goto out;
if (is_unstable) set_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state);