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fuse: truncate pending writes on O_TRUNC

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commit e4648309b85a78f8c787457832269a8712a8673e upstream.

Make sure cached writes are not reordered around open(..., O_TRUNC), with
the obvious wrong results.

Fixes: 4d99ff8f12eb ("fuse: Turn writeback cache on")
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2019-10-23 14:26:37 +02:00 committed by prashantpaddune
parent 891cfef4f2
commit 64bfdbecc9
1 changed files with 7 additions and 3 deletions
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10
fs/fuse/file.c
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@ -201,7 +201,7 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
{
struct fuse_conn *fc = get_fuse_conn(inode);
int err;
bool lock_inode = (file->f_flags & O_TRUNC) &&
bool is_wb_truncate = (file->f_flags & O_TRUNC) &&
fc->atomic_o_trunc &&
fc->writeback_cache;
@ -209,16 +209,20 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
if (err)
return err;
if (lock_inode)
if (is_wb_truncate) {
mutex_lock(&inode->i_mutex);
fuse_set_nowrite(inode);
}
err = fuse_do_open(fc, get_node_id(inode), file, isdir);
if (!err)
fuse_finish_open(inode, file);
if (lock_inode)
if (is_wb_truncate) {
fuse_release_nowrite(inode);
mutex_unlock(&inode->i_mutex);
}
return err;
}