diff options
| author | Hao Xu <howeyxu@tencent.com> | 2023-08-01 16:06:46 +0800 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2023-08-16 12:39:16 +0200 |
| commit | e78662e818f9478e70912cc2970ca632ec9f3635 (patch) | |
| tree | 314381c812fb07d72c61135a69fe27caf50a191e /fs/fuse/inode.c | |
| parent | 80e4f25262f9f1a5f08154fafaa6ac4371043d35 (diff) | |
fuse: add a new fuse init flag to relax restrictions in no cache mode
FOPEN_DIRECT_IO is usually set by fuse daemon to indicate need of strong
coherency, e.g. network filesystems. Thus shared mmap is disabled since it
leverages page cache and may write to it, which may cause inconsistence.
But FOPEN_DIRECT_IO can be used not for coherency but to reduce memory
footprint as well, e.g. reduce guest memory usage with virtiofs.
Therefore, add a new fuse init flag FUSE_DIRECT_IO_RELAX to relax
restrictions in that mode, currently, it allows shared mmap. One thing to
note is to make sure it doesn't break coherency in your use case.
Signed-off-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/inode.c')
| -rw-r--r-- | fs/fuse/inode.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index f19d748890f0..4a16185eacae 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -1212,6 +1212,8 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args, fc->init_security = 1; if (flags & FUSE_CREATE_SUPP_GROUP) fc->create_supp_group = 1; + if (flags & FUSE_DIRECT_IO_RELAX) + fc->direct_io_relax = 1; } else { ra_pages = fc->max_read / PAGE_SIZE; fc->no_lock = 1; @@ -1258,7 +1260,7 @@ void fuse_send_init(struct fuse_mount *fm) FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA | FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT | FUSE_SECURITY_CTX | FUSE_CREATE_SUPP_GROUP | - FUSE_HAS_EXPIRE_ONLY; + FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_RELAX; #ifdef CONFIG_FUSE_DAX if (fm->fc->dax) flags |= FUSE_MAP_ALIGNMENT; |