qemu-kvm/kvm-virtiofsd-passthrough_ll-cleanup-getxattr-listxattr.patch

From f93ea308351cbe2630d7ecf637c3b69894d84a11 Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Tue, 3 Mar 2020 18:43:13 +0000
Subject: [PATCH 17/18] virtiofsd: passthrough_ll: cleanup getxattr/listxattr
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20200303184314.155564-7-dgilbert@redhat.com>
Patchwork-id: 94125
O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 6/7] virtiofsd: passthrough_ll: cleanup getxattr/listxattr
Bugzilla: 1797064
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
RH-Acked-by: Ján Tomko <jtomko@redhat.com>

From: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>

This is a cleanup patch to simplify the following xattr fix and
there is no functional changes.

- Move memory allocation to head of the function
- Unify fgetxattr/flistxattr call for both size == 0 and
  size != 0 case
- Remove redundant lo_inode_put call in error path
  (Note: second call is ignored now since @inode is already NULL)

Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Message-Id: <20200227055927.24566-2-misono.tomohiro@jp.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 16e15a73089102c3d8846792d514e769300fcc3c)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 tools/virtiofsd/passthrough_ll.c | 54 ++++++++++++++++------------------------
 1 file changed, 22 insertions(+), 32 deletions(-)

diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index c635fc8..50c7273 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -2199,34 +2199,30 @@ static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
         goto out;
     }
 
+    if (size) {
+        value = malloc(size);
+        if (!value) {
+            goto out_err;
+        }
+    }
+
     sprintf(procname, "%i", inode->fd);
     fd = openat(lo->proc_self_fd, procname, O_RDONLY);
     if (fd < 0) {
         goto out_err;
     }
 
+    ret = fgetxattr(fd, name, value, size);
+    if (ret == -1) {
+        goto out_err;
+    }
     if (size) {
-        value = malloc(size);
-        if (!value) {
-            goto out_err;
-        }
-
-        ret = fgetxattr(fd, name, value, size);
-        if (ret == -1) {
-            goto out_err;
-        }
         saverr = 0;
         if (ret == 0) {
             goto out;
         }
-
         fuse_reply_buf(req, value, ret);
     } else {
-        ret = fgetxattr(fd, name, NULL, 0);
-        if (ret == -1) {
-            goto out_err;
-        }
-
         fuse_reply_xattr(req, ret);
     }
 out_free:
@@ -2242,7 +2238,6 @@ out_free:
 out_err:
     saverr = errno;
 out:
-    lo_inode_put(lo, &inode);
     fuse_reply_err(req, saverr);
     goto out_free;
 }
@@ -2277,34 +2272,30 @@ static void lo_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size)
         goto out;
     }
 
+    if (size) {
+        value = malloc(size);
+        if (!value) {
+            goto out_err;
+        }
+    }
+
     sprintf(procname, "%i", inode->fd);
     fd = openat(lo->proc_self_fd, procname, O_RDONLY);
     if (fd < 0) {
         goto out_err;
     }
 
+    ret = flistxattr(fd, value, size);
+    if (ret == -1) {
+        goto out_err;
+    }
     if (size) {
-        value = malloc(size);
-        if (!value) {
-            goto out_err;
-        }
-
-        ret = flistxattr(fd, value, size);
-        if (ret == -1) {
-            goto out_err;
-        }
         saverr = 0;
         if (ret == 0) {
             goto out;
         }
-
         fuse_reply_buf(req, value, ret);
     } else {
-        ret = flistxattr(fd, NULL, 0);
-        if (ret == -1) {
-            goto out_err;
-        }
-
         fuse_reply_xattr(req, ret);
     }
 out_free:
@@ -2320,7 +2311,6 @@ out_free:
 out_err:
     saverr = errno;
 out:
-    lo_inode_put(lo, &inode);
     fuse_reply_err(req, saverr);
     goto out_free;
 }
-- 
1.8.3.1