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Linux 4.7 compat: use iterate_shared for concurrent readdir

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Register iterate_shared if it exists so the kernel will used shared
lock and allowing concurrent readdir.

Also, use shared lock when doing llseek with SEEK_DATA or SEEK_HOLE
to allow concurrent seeking.

Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4664
Closes #4665
This commit is contained in:
Chunwei Chen
2016-05-18 14:30:20 -07:00
committed by Brian Behlendorf
parent e42d46664e
commit 9baaa7deae
4 changed files with 54 additions and 25 deletions
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config/kernel-vfs-iterate.m4
+35 -14
View File
@@ -1,8 +1,8 @@
dnl #
dnl # 3.11 API change
dnl #
AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
AC_MSG_CHECKING([whether fops->iterate() is available])
dnl #
dnl # 4.7 API change
dnl #
AC_MSG_CHECKING([whether fops->iterate_shared() is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int iterate(struct file *filp, struct dir_context * context)
@@ -10,34 +10,55 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
static const struct file_operations fops
__attribute__ ((unused)) = {
.iterate = iterate,
.iterate_shared = iterate,
};
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_VFS_ITERATE, 1,
[fops->iterate() is available])
AC_DEFINE(HAVE_VFS_ITERATE_SHARED, 1,
[fops->iterate_shared() is available])
],[
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether fops->readdir() is available])
dnl #
dnl # 3.11 API change
dnl #
AC_MSG_CHECKING([whether fops->iterate() is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int readdir(struct file *filp, void *entry, filldir_t func)
int iterate(struct file *filp, struct dir_context * context)
{ return 0; }
static const struct file_operations fops
__attribute__ ((unused)) = {
.readdir = readdir,
.iterate = iterate,
};
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_VFS_READDIR, 1,
[fops->readdir() is available])
AC_DEFINE(HAVE_VFS_ITERATE, 1,
[fops->iterate() is available])
],[
AC_MSG_ERROR(no; file a bug report with ZFSOnLinux)
])
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether fops->readdir() is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int readdir(struct file *filp, void *entry, filldir_t func)
{ return 0; }
static const struct file_operations fops
__attribute__ ((unused)) = {
.readdir = readdir,
};
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_VFS_READDIR, 1,
[fops->readdir() is available])
],[
AC_MSG_ERROR(no; file a bug report with ZFSOnLinux)
])
])
])
])