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45b04ef48d
Honor the expected behavior of syncfs() to synchronously flush all data and metadata to disk on linux systems. If virtiofsd is started with '-o announce_submounts', the client is expected to send a FUSE_SYNCFS request for each individual submount. In this case, we just create a new file descriptor on the submount inode with lo_inode_open(), call syncfs() on it and close it. The intermediary file is needed because O_PATH descriptors aren't backed by an actual file and syncfs() would fail with EBADF. If virtiofsd is started without '-o announce_submounts' or if the client doesn't have the FUSE_CAP_SUBMOUNTS capability, the client only sends a single FUSE_SYNCFS request for the root inode. The server would thus need to track submounts internally and call syncfs() on each of them. This will be implemented later. Note that syncfs() might suffer from a time penalty if the submounts are being hammered by some unrelated workload on the host. The only solution to prevent that is to avoid shared mounts. Signed-off-by: Greg Kurz <groug@kaod.org> Message-Id: <20220215181529.164070-2-groug@kaod.org> Reviewed-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> |
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| .. | ||
| 50-qemu-virtiofsd.json.in | ||
| buffer.c | ||
| fuse_common.h | ||
| fuse_i.h | ||
| fuse_log.c | ||
| fuse_log.h | ||
| fuse_lowlevel.c | ||
| fuse_lowlevel.h | ||
| fuse_misc.h | ||
| fuse_opt.c | ||
| fuse_opt.h | ||
| fuse_signals.c | ||
| fuse_virtio.c | ||
| fuse_virtio.h | ||
| helper.c | ||
| meson.build | ||
| passthrough_helpers.h | ||
| passthrough_ll.c | ||
| passthrough_seccomp.c | ||
| passthrough_seccomp.h | ||