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[PATCH 039/104] virtiofsd: Plumb fuse_bufvec through to do_write_buf
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PATCH 039/104] virtiofsd: Plumb fuse_bufvec through to do_write_buf |
Date: |
Thu, 12 Dec 2019 16:37:59 +0000 |
From: "Dr. David Alan Gilbert" <address@hidden>
Let fuse_session_process_buf_int take a fuse_bufvec * instead of a
fuse_buf; and then through to do_write_buf - where in the best
case it can pass that straight through to op.write_buf without copying
(other than skipping a header).
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
tools/virtiofsd/fuse_i.h | 2 +-
tools/virtiofsd/fuse_lowlevel.c | 61 ++++++++++++++++++++++-----------
tools/virtiofsd/fuse_virtio.c | 3 +-
3 files changed, 44 insertions(+), 22 deletions(-)
diff --git a/tools/virtiofsd/fuse_i.h b/tools/virtiofsd/fuse_i.h
index cb1ca70ffa..d0679508cd 100644
--- a/tools/virtiofsd/fuse_i.h
+++ b/tools/virtiofsd/fuse_i.h
@@ -119,7 +119,7 @@ int fuse_send_reply_iov_nofree(fuse_req_t req, int error,
struct iovec *iov,
void fuse_free_req(fuse_req_t req);
void fuse_session_process_buf_int(struct fuse_session *se,
- const struct fuse_buf *buf,
+ struct fuse_bufvec *bufv,
struct fuse_chan *ch);
diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index bea092b454..7d33bbf539 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -1006,11 +1006,12 @@ static void do_write(fuse_req_t req, fuse_ino_t nodeid,
const void *inarg)
}
static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
- const struct fuse_buf *ibuf)
+ struct fuse_bufvec *ibufv)
{
struct fuse_session *se = req->se;
- struct fuse_bufvec bufv = {
- .buf[0] = *ibuf,
+ struct fuse_bufvec *pbufv = ibufv;
+ struct fuse_bufvec tmpbufv = {
+ .buf[0] = ibufv->buf[0],
.count = 1,
};
struct fuse_write_in *arg = (struct fuse_write_in *)inarg;
@@ -1020,22 +1021,31 @@ static void do_write_buf(fuse_req_t req, fuse_ino_t
nodeid, const void *inarg,
fi.fh = arg->fh;
fi.writepage = arg->write_flags & FUSE_WRITE_CACHE;
- fi.lock_owner = arg->lock_owner;
- fi.flags = arg->flags;
- if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD)) {
- bufv.buf[0].mem = PARAM(arg);
- }
-
- bufv.buf[0].size -=
- sizeof(struct fuse_in_header) + sizeof(struct fuse_write_in);
- if (bufv.buf[0].size < arg->size) {
- fuse_log(FUSE_LOG_ERR, "fuse: do_write_buf: buffer size too small\n");
- fuse_reply_err(req, EIO);
- return;
+ if (ibufv->count == 1) {
+ fi.lock_owner = arg->lock_owner;
+ fi.flags = arg->flags;
+ if (!(tmpbufv.buf[0].flags & FUSE_BUF_IS_FD)) {
+ tmpbufv.buf[0].mem = PARAM(arg);
+ }
+ tmpbufv.buf[0].size -=
+ sizeof(struct fuse_in_header) + sizeof(struct fuse_write_in);
+ if (tmpbufv.buf[0].size < arg->size) {
+ fuse_log(FUSE_LOG_ERR,
+ "fuse: do_write_buf: buffer size too small\n");
+ fuse_reply_err(req, EIO);
+ return;
+ }
+ tmpbufv.buf[0].size = arg->size;
+ pbufv = &tmpbufv;
+ } else {
+ /*
+ * Input bufv contains the headers in the first element
+ * and the data in the rest, we need to skip that first element
+ */
+ ibufv->buf[0].size = 0;
}
- bufv.buf[0].size = arg->size;
- se->op.write_buf(req, nodeid, &bufv, arg->offset, &fi);
+ se->op.write_buf(req, nodeid, pbufv, arg->offset, &fi);
}
static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
@@ -2027,13 +2037,24 @@ static const char *opname(enum fuse_opcode opcode)
void fuse_session_process_buf(struct fuse_session *se,
const struct fuse_buf *buf)
{
- fuse_session_process_buf_int(se, buf, NULL);
+ struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 };
+ fuse_session_process_buf_int(se, &bufv, NULL);
}
+/*
+ * Restriction:
+ * bufv is normally a single entry buffer, except for a write
+ * where (if it's in memory) then the bufv may be multiple entries,
+ * where the first entry contains all headers and subsequent entries
+ * contain data
+ * bufv shall not use any offsets etc to make the data anything
+ * other than contiguous starting from 0.
+ */
void fuse_session_process_buf_int(struct fuse_session *se,
- const struct fuse_buf *buf,
+ struct fuse_bufvec *bufv,
struct fuse_chan *ch)
{
+ const struct fuse_buf *buf = bufv->buf;
struct fuse_in_header *in;
const void *inarg;
struct fuse_req *req;
@@ -2111,7 +2132,7 @@ void fuse_session_process_buf_int(struct fuse_session *se,
inarg = (void *)&in[1];
if (in->opcode == FUSE_WRITE && se->op.write_buf) {
- do_write_buf(req, in->nodeid, inarg, buf);
+ do_write_buf(req, in->nodeid, inarg, bufv);
} else {
fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
}
diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c
index fa6e53e7d0..99c877ea2e 100644
--- a/tools/virtiofsd/fuse_virtio.c
+++ b/tools/virtiofsd/fuse_virtio.c
@@ -499,7 +499,8 @@ static void *fv_queue_thread(void *opaque)
/* TODO! Endianness of header */
/* TODO: Add checks for fuse_session_exited */
- fuse_session_process_buf_int(se, &fbuf, &ch);
+ struct fuse_bufvec bufv = { .buf[0] = fbuf, .count = 1 };
+ fuse_session_process_buf_int(se, &bufv, &ch);
if (!qi->reply_sent) {
fuse_log(FUSE_LOG_DEBUG, "%s: elem %d no reply sent\n",
--
2.23.0
- [PATCH 031/104] virtiofs: Add maintainers entry, (continued)
- [PATCH 031/104] virtiofs: Add maintainers entry, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 028/104] virtiofsd: make -f (foreground) the default, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 029/104] virtiofsd: add vhost-user.json file, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 032/104] virtiofsd: passthrough_ll: create new files in caller's context, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 033/104] virtiofsd: passthrough_ll: add lo_map for ino/fh indirection, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 034/104] virtiofsd: passthrough_ll: add ino_map to hide lo_inode pointers, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 036/104] virtiofsd: passthrough_ll: add fd_map to hide file descriptors, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 037/104] virtiofsd: passthrough_ll: add fallback for racy ops, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 038/104] virtiofsd: validate path components, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 040/104] virtiofsd: Pass write iov's all the way through, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 039/104] virtiofsd: Plumb fuse_bufvec through to do_write_buf,
Dr. David Alan Gilbert (git) <=
- [PATCH 035/104] virtiofsd: passthrough_ll: add dirp_map to hide lo_dirp pointers, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 041/104] virtiofsd: add fuse_mbuf_iter API, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 042/104] virtiofsd: validate input buffer sizes in do_write_buf(), Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 044/104] virtiofsd: prevent ".." escape in lo_do_lookup(), Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 045/104] virtiofsd: prevent ".." escape in lo_do_readdir(), Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 043/104] virtiofsd: check input buffer size in fuse_lowlevel.c ops, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 046/104] virtiofsd: use /proc/self/fd/ O_PATH file descriptor, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 047/104] virtiofsd: sandbox mount namespace, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 048/104] virtiofsd: move to an empty network namespace, Dr. David Alan Gilbert (git), 2019/12/12
- [PATCH 049/104] virtiofsd: move to a new pid namespace, Dr. David Alan Gilbert (git), 2019/12/12