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Linux 4.7 compat: use iterate_shared for concurrent readdir 

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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25
config/kernel-vfs-iterate.m4
View File

@ -1,7 +1,28 @@
AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
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)
{ return 0; }
static const struct file_operations fops
__attribute__ ((unused)) = {
.iterate_shared = iterate,
};
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_VFS_ITERATE_SHARED, 1,
[fops->iterate_shared() is available])
],[
AC_MSG_RESULT(no)
dnl #
dnl # 3.11 API change
dnl #
AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
AC_MSG_CHECKING([whether fops->iterate() is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
@ -38,6 +59,6 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
],[
AC_MSG_ERROR(no; file a bug report with ZFSOnLinux)
])
])
])
])

2
include/sys/zpl.h
View File

@ -123,7 +123,7 @@ extern const struct inode_operations zpl_ops_snapdirs;
extern const struct file_operations zpl_fops_shares;
extern const struct inode_operations zpl_ops_shares;
#ifdef HAVE_VFS_ITERATE
#if defined(HAVE_VFS_ITERATE) || defined(HAVE_VFS_ITERATE_SHARED)
#define DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
.actor = _actor, \

18
module/zfs/zpl_ctldir.c
View File

@ -81,7 +81,7 @@ out:
return (error);
}
#if !defined(HAVE_VFS_ITERATE)
#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
static int
zpl_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
@ -144,7 +144,9 @@ const struct file_operations zpl_fops_root = {
.open = zpl_common_open,
.llseek = generic_file_llseek,
.read = generic_read_dir,
#ifdef HAVE_VFS_ITERATE
#ifdef HAVE_VFS_ITERATE_SHARED
.iterate_shared = zpl_root_iterate,
#elif defined(HAVE_VFS_ITERATE)
.iterate = zpl_root_iterate,
#else
.readdir = zpl_root_readdir,
@ -285,7 +287,7 @@ out:
return (error);
}
#if !defined(HAVE_VFS_ITERATE)
#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
static int
zpl_snapdir_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
@ -385,7 +387,9 @@ const struct file_operations zpl_fops_snapdir = {
.open = zpl_common_open,
.llseek = generic_file_llseek,
.read = generic_read_dir,
#ifdef HAVE_VFS_ITERATE
#ifdef HAVE_VFS_ITERATE_SHARED
.iterate_shared = zpl_snapdir_iterate,
#elif defined(HAVE_VFS_ITERATE)
.iterate = zpl_snapdir_iterate,
#else
.readdir = zpl_snapdir_readdir,
@ -472,7 +476,7 @@ out:
return (error);
}
#if !defined(HAVE_VFS_ITERATE)
#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
static int
zpl_shares_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
@ -525,7 +529,9 @@ const struct file_operations zpl_fops_shares = {
.open = zpl_common_open,
.llseek = generic_file_llseek,
.read = generic_read_dir,
#ifdef HAVE_VFS_ITERATE
#ifdef HAVE_VFS_ITERATE_SHARED
.iterate_shared = zpl_shares_iterate,
#elif defined(HAVE_VFS_ITERATE)
.iterate = zpl_shares_iterate,
#else
.readdir = zpl_shares_readdir,

10
module/zfs/zpl_file.c
View File

@ -93,7 +93,7 @@ zpl_iterate(struct file *filp, struct dir_context *ctx)
return (error);
}
#if !defined(HAVE_VFS_ITERATE)
#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
static int
zpl_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
@ -421,13 +421,13 @@ zpl_llseek(struct file *filp, loff_t offset, int whence)
loff_t maxbytes = ip->i_sb->s_maxbytes;
loff_t error;
spl_inode_lock(ip);
spl_inode_lock_shared(ip);
cookie = spl_fstrans_mark();
error = -zfs_holey(ip, whence, &offset);
spl_fstrans_unmark(cookie);
if (error == 0)
error = lseek_execute(filp, ip, offset, maxbytes);
spl_inode_unlock(ip);
spl_inode_unlock_shared(ip);
return (error);
}
@ -853,7 +853,9 @@ const struct file_operations zpl_file_operations = {
const struct file_operations zpl_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
#ifdef HAVE_VFS_ITERATE
#ifdef HAVE_VFS_ITERATE_SHARED
.iterate_shared = zpl_iterate,
#elif defined(HAVE_VFS_ITERATE)
.iterate = zpl_iterate,
#else
.readdir = zpl_readdir,