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f45498 |
From 5a26d7e5d858b3d608e885351099a12dcc4ae1da Mon Sep 17 00:00:00 2001
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f45498 |
From: Jon Maloy <jmaloy@redhat.com>
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f45498 |
Date: Wed, 10 Feb 2021 00:02:16 -0500
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f45498 |
Subject: [PATCH 2/3] virtiofsd: optionally return inode pointer from
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f45498 |
lo_do_lookup()
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f45498 |
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f45498 |
RH-Author: Jon Maloy <jmaloy@redhat.com>
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f45498 |
Message-id: <20210210000217.1561306-3-jmaloy@redhat.com>
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f45498 |
Patchwork-id: 101026
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f45498 |
O-Subject: [RHEL-8.3.0.z qemu-kvm PATCH 2/3] virtiofsd: optionally return inode pointer from lo_do_lookup()
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f45498 |
Bugzilla: 1919109
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f45498 |
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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f45498 |
RH-Acked-by: Greg Kurz <gkurz@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
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f45498 |
From: Stefan Hajnoczi <stefanha@redhat.com>
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f45498 |
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f45498 |
lo_do_lookup() finds an existing inode or allocates a new one. It
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f45498 |
increments nlookup so that the inode stays alive until the client
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f45498 |
releases it.
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f45498 |
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f45498 |
Existing callers don't need the struct lo_inode so the function doesn't
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f45498 |
return it. Extend the function to optionally return the inode. The next
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f45498 |
commit will need it.
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f45498 |
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f45498 |
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
Reviewed-by: Greg Kurz <groug@kaod.org>
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f45498 |
Message-Id: <20210204150208.367837-3-stefanha@redhat.com>
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f45498 |
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
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f45498 |
(cherry-picked from commit 22d2ece71e533310da31f2857ebc4a00d91968b3)
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f45498 |
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
Signed-off-by: Jon Maloy <jmaloy.redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
---
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f45498 |
tools/virtiofsd/passthrough_ll.c | 29 +++++++++++++++++++++--------
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f45498 |
1 file changed, 21 insertions(+), 8 deletions(-)
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f45498 |
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f45498 |
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
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f45498 |
index 518ba11c47..e5bd3d73e4 100644
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f45498 |
--- a/tools/virtiofsd/passthrough_ll.c
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f45498 |
+++ b/tools/virtiofsd/passthrough_ll.c
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f45498 |
@@ -878,11 +878,13 @@ static void posix_locks_value_destroy(gpointer data)
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f45498 |
}
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f45498 |
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f45498 |
/*
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f45498 |
- * Increments nlookup and caller must release refcount using
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f45498 |
- * lo_inode_put(&parent).
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f45498 |
+ * Increments nlookup on the inode on success. unref_inode_lolocked() must be
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f45498 |
+ * called eventually to decrement nlookup again. If inodep is non-NULL, the
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f45498 |
+ * inode pointer is stored and the caller must call lo_inode_put().
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f45498 |
*/
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f45498 |
static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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f45498 |
- struct fuse_entry_param *e)
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f45498 |
+ struct fuse_entry_param *e,
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f45498 |
+ struct lo_inode **inodep)
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f45498 |
{
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f45498 |
int newfd;
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f45498 |
int res;
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f45498 |
@@ -891,6 +893,10 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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f45498 |
struct lo_inode *inode = NULL;
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f45498 |
struct lo_inode *dir = lo_inode(req, parent);
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f45498 |
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f45498 |
+ if (inodep) {
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f45498 |
+ *inodep = NULL;
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f45498 |
+ }
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f45498 |
+
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f45498 |
/*
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f45498 |
* name_to_handle_at() and open_by_handle_at() can reach here with fuse
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f45498 |
* mount point in guest, but we don't have its inode info in the
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f45498 |
@@ -953,7 +959,14 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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f45498 |
pthread_mutex_unlock(&lo->mutex);
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f45498 |
}
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f45498 |
e->ino = inode->fuse_ino;
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f45498 |
- lo_inode_put(lo, &inode;;
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f45498 |
+
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f45498 |
+ /* Transfer ownership of inode pointer to caller or drop it */
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f45498 |
+ if (inodep) {
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f45498 |
+ *inodep = inode;
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f45498 |
+ } else {
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f45498 |
+ lo_inode_put(lo, &inode;;
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f45498 |
+ }
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f45498 |
+
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f45498 |
lo_inode_put(lo, &dir;;
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f45498 |
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fuse_log(FUSE_LOG_DEBUG, " %lli/%s -> %lli\n", (unsigned long long)parent,
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f45498 |
@@ -988,7 +1001,7 @@ static void lo_lookup(fuse_req_t req, fuse_ino_t parent, const char *name)
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f45498 |
return;
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f45498 |
}
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f45498 |
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f45498 |
- err = lo_do_lookup(req, parent, name, &e);
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f45498 |
+ err = lo_do_lookup(req, parent, name, &e, NULL);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
if (err) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
fuse_reply_err(req, err);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
} else {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
@@ -1098,7 +1111,7 @@ static void lo_mknod_symlink(fuse_req_t req, fuse_ino_t parent,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
goto out;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
- saverr = lo_do_lookup(req, parent, name, &e);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
+ saverr = lo_do_lookup(req, parent, name, &e, NULL);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
if (saverr) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
goto out;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
@@ -1599,7 +1612,7 @@ static void lo_do_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
if (plus) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
if (!is_dot_or_dotdot(name)) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
- err = lo_do_lookup(req, ino, name, &e);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
+ err = lo_do_lookup(req, ino, name, &e, NULL);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
if (err) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
goto error;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
@@ -1793,7 +1806,7 @@ static void lo_create(fuse_req_t req, fuse_ino_t parent, const char *name,
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
fi->fh = fh;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
- err = lo_do_lookup(req, parent, name, &e);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
+ err = lo_do_lookup(req, parent, name, &e, NULL);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
if (lo->cache == CACHE_NONE) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
fi->direct_io = 1;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
--
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
2.18.2
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
f45498 |
|