On Wed, 2 Mar 2022 at 18:18, Kevin Vigor <kvigor@xxxxxxxxx> wrote: > > The existing process_init_reply() in fs/fuse/inode.c sets the ra_pages > value to the minimum of the max_readahead value provided by the user > and the pre-existing ra_pages value, which is initialized to > VM_READAHEAD_PAGES. This makes it impossible to increase the readahead > value to larger values. > > Add a new flag which causes us to blindly accept the user-provided > value. Note that the existing read_ahead_kb sysfs entry for normal > block devices does the same (simply accepts user-provided values > directly with no checks). read_ahead_kb only allows root to open for write. Allowing non-root arbitrary read ahead window size is not a good idea, IMO. Thanks, Miklos
