Stock kernels don't have FIEMAP support in fuse filesystems, we've added the support for FIEMAP for pStorage performance.
Now if you call FIEMAP ioctl on a FUSE fs (for example mergerfs, sshfs, mhddfs), libfuse crashes (the function fuse_lib_ioctl aborts due to inbufsz > != outbufsz). Let's pretend we don't provide FIEMAP for any FUSE fs except for pStorage. https://bugs.openvz.org/browse/OVZ-7145 Signed-off-by: Konstantin Khorenko <khore...@virtuozzo.com> --- fs/ioctl.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/ioctl.c b/fs/ioctl.c index 0eeebd1723aaa..99a5df85306cf 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -180,7 +180,12 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg) u64 len; int error; - if (!inode->i_op->fiemap) + /* + * Among FUSE filesystems only pStorage has FIEMAP support, + * generic libfuse is not ready for it. + */ + if ((!inode->i_op->fiemap) || + ((sb->s_magic == FUSE_SUPER_MAGIC) && !IS_PSTORAGE(sb))) return -EOPNOTSUPP; if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) -- 2.15.1 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
