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[v4,5/6] 9pfs: fix removing non-existent POSIX ACL xattr on macOS host

Message ID 9734fae9a02b748846af667c58a1ef005f4e6759.1651085922.git.qemu_oss@crudebyte.com (mailing list archive)
State New, archived
Headers show
Series 9pfs: macOS host fixes | expand

Commit Message

Christian Schoenebeck April 27, 2022, 6:54 p.m. UTC 
When mapped POSIX ACL is used, we are ignoring errors when trying
to remove a POSIX ACL xattr that does not exist. On Linux hosts we
would get ENODATA in such cases, on macOS hosts however we get
ENOATTR instead.

As we can be sure that ENOATTR is defined as being identical on Linux
hosts (at least by qemu/xattr.h), it is safe to fix this issue by
simply comparing against ENOATTR instead of ENODATA.

This patch fixes e.g. a command on Linux guest like:

  cp --preserve=mode old new

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Link: https://lore.kernel.org/qemu-devel/2866993.yOYK24bMf6@silver/
Reviewed-by: Greg Kurz <groug@kaod.org>
---
 hw/9pfs/9p-posix-acl.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
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Patch

diff --git a/hw/9pfs/9p-posix-acl.c b/hw/9pfs/9p-posix-acl.c
index eadae270dd..4b2cb3c66c 100644
--- a/hw/9pfs/9p-posix-acl.c
+++ b/hw/9pfs/9p-posix-acl.c
@@ -65,7 +65,11 @@  static int mp_pacl_removexattr(FsContext *ctx,
     int ret;
 
     ret = local_removexattr_nofollow(ctx, path, MAP_ACL_ACCESS);
-    if (ret == -1 && errno == ENODATA) {
+    /*
+     * macOS returns ENOATTR (!=ENODATA on macOS), whereas Linux returns
+     * ENODATA (==ENOATTR on Linux), so checking for ENOATTR is fine
+     */
+    if (ret == -1 && errno == ENOATTR) {
         /*
          * We don't get ENODATA error when trying to remove a
          * posix acl that is not present. So don't throw the error
@@ -115,7 +119,11 @@  static int mp_dacl_removexattr(FsContext *ctx,
     int ret;
 
     ret = local_removexattr_nofollow(ctx, path, MAP_ACL_DEFAULT);
-    if (ret == -1 && errno == ENODATA) {
+    /*
+     * macOS returns ENOATTR (!=ENODATA on macOS), whereas Linux returns
+     * ENODATA (==ENOATTR on Linux), so checking for ENOATTR is fine
+     */
+    if (ret == -1 && errno == ENOATTR) {
         /*
          * We don't get ENODATA error when trying to remove a
          * posix acl that is not present. So don't throw the error