LU-16258 llite: Explicitly support .splice_write

Linux commit v5.9-rc1-6-g36e2c7421f02
  fs: don't allow splice read/write without explicit ops

Lustre supports splice_write and previously provide handlers
for splice_read.
Explicitly use iter_file_splice_write, if it exists.

Lustre-change: https://review.whamcloud.com/48928
Lustre-commit: c619b6d6a54235cc0e34a65cf5916a632f4011c3

HPE-bug-id: LUS-11259
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I858688fc9b4dd370b6018c3b134f01e580477b25
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/49047
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index f718d93..e27ef28 100644 (file)
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -1834,7 +1834,7 @@ vfs_setxattr, [
        __vfs_setxattr(NULL, NULL, NULL, NULL, 0, 0);
 ],[
        AC_DEFINE(HAVE_VFS_SETXATTR, 1,
-               ['__vfs_setxattr is available])
+               ['__vfs_setxattr' is available])
 ])
 ]) # LC_VFS_SETXATTR
 
@@ -2503,6 +2503,27 @@ EXTRA_KCFLAGS="$tmp_flags"
 ]) # LC_FORCE_UACCESS_BEGIN
 
 #
+# LC_HAVE_ITER_FILE_SPLICE_WRITE
+#
+# Linux commit v5.9-rc1-6-g36e2c7421f02
+#  fs: don't allow splice read/write without explicit ops
+#
+AC_DEFUN([LC_HAVE_ITER_FILE_SPLICE_WRITE], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if 'iter_file_splice_write' exists],
+iter_file_splice_write, [
+       #include <linux/fs.h>
+],[
+       (void)iter_file_splice_write(NULL, NULL, NULL, 1, 0);
+],[
+       AC_DEFINE(HAVE_ITER_FILE_SPLICE_WRITE, 1,
+               ['iter_file_splice_write' exists])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LC_HAVE_ITER_FILE_SPLICE_WRITE
+
+#
 # LC_FSCRYPT_SUPPORT
 #
 # 5.4 introduced fscrypt encryption policies v2
@@ -2775,6 +2796,9 @@ AC_DEFUN([LC_PROG_LINUX], [
        # 5.10
        LC_FORCE_UACCESS_BEGIN
 
+       # 5.10
+       LC_HAVE_ITER_FILE_SPLICE_WRITE
+
        # 5.12
        LC_HAVE_USER_NAMESPACE_ARG
        LC_HAVE_FILEATTR_OPS

diff --git a/lustre/llite/file.c b/lustre/llite/file.c
index 24b205c..a173134 100644 (file)
--- a/lustre/llite/file.c
+++ b/lustre/llite/file.c
@@ -5800,6 +5800,9 @@ const struct file_operations ll_file_operations = {
 #else
        .splice_read    = pcc_file_splice_read,
 #endif
+#ifdef HAVE_ITER_FILE_SPLICE_WRITE
+       .splice_write   = iter_file_splice_write,
+#endif
        .fsync          = ll_fsync,
        .flush          = ll_flush,
        .fallocate      = ll_fallocate,
@@ -5829,6 +5832,9 @@ const struct file_operations ll_file_operations_flock = {
 #else
        .splice_read    = pcc_file_splice_read,
 #endif
+#ifdef HAVE_ITER_FILE_SPLICE_WRITE
+       .splice_write   = iter_file_splice_write,
+#endif
        .fsync          = ll_fsync,
        .flush          = ll_flush,
        .flock          = ll_file_flock,
@@ -5861,6 +5867,9 @@ const struct file_operations ll_file_operations_noflock = {
 #else
        .splice_read    = pcc_file_splice_read,
 #endif
+#ifdef HAVE_ITER_FILE_SPLICE_WRITE
+       .splice_write   = iter_file_splice_write,
+#endif
        .fsync          = ll_fsync,
        .flush          = ll_flush,
        .flock          = ll_file_noflock,