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virtiofsd: Check FUSE_SUBMOUNTS

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FUSE_SUBMOUNTS is a pure indicator by the kernel to signal that it
supports submounts.  It does not check its state in the init reply, so
there is nothing for fuse_lowlevel.c to do but to check its existence
and copy it into fuse_conn_info.capable.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20201102161859.156603-2-mreitz@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Max Reitz 2020-11-02 17:18:53 +01:00 committed by Dr. David Alan Gilbert
parent 0429eaf518
commit 9c6ac04363
2 changed files with 10 additions and 0 deletions
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7
tools/virtiofsd/fuse_common.h
View File

@ -352,6 +352,13 @@ struct fuse_file_info {
*/
#define FUSE_CAP_NO_OPENDIR_SUPPORT (1 << 24)
/**
* Indicates that the kernel supports the FUSE_ATTR_SUBMOUNT flag.
*
* Setting (or unsetting) this flag in the `want` field has *no effect*.
*/
#define FUSE_CAP_SUBMOUNTS (1 << 27)
/**
* Ioctl flags
*

3
tools/virtiofsd/fuse_lowlevel.c
View File

@ -1988,6 +1988,9 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid,
bufsize = max_bufsize;
}
}
if (arg->flags & FUSE_SUBMOUNTS) {
se->conn.capable |= FUSE_CAP_SUBMOUNTS;
}
#ifdef HAVE_SPLICE
#ifdef HAVE_VMSPLICE
se->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;