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Linux 4.12 compat: super_setup_bdi_name()

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All filesystems were converted to dynamically allocated BDIs.  The
destruction of backing_dev_info structures is handled as part of
super block destruction.  Refactor the code to abstract away the
details of creating and destroying a BDI.

Reviewed-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #6089
This commit is contained in:
Brian Behlendorf 2017-05-02 09:46:18 -07:00 committed by GitHub
parent 153b228554
commit 7dae2c81e7
6 changed files with 141 additions and 54 deletions
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38
config/kernel-bdi-setup-and-register.m4
View File

@ -1,38 +0,0 @@
dnl #
dnl # 2.6.32 - 2.6.33, bdi_setup_and_register() is not exported.
dnl # 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
dnl # 4.0 - x.y, bdi_setup_and_register() takes 2 arguments.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER], [
AC_MSG_CHECKING([whether bdi_setup_and_register() wants 2 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 2 args])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether bdi_setup_and_register() wants 3 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
unsigned int cap = BDI_CAP_MAP_COPY;
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name, cap);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_3ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 3 args])
], [
AC_MSG_RESULT(no)
])
])
])

56
config/kernel-bdi.m4 Normal file
View File

@ -0,0 +1,56 @@
dnl #
dnl # 2.6.32 - 2.6.33, bdi_setup_and_register() is not exported.
dnl # 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
dnl # 4.0 - 4.11, bdi_setup_and_register() takes 2 arguments.
dnl # 4.12 - x.y, super_setup_bdi_name() new interface.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BDI], [
AC_MSG_CHECKING([whether super_setup_bdi_name() exists])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/fs.h>
struct super_block sb;
], [
char *name = "bdi";
int error __attribute__((unused)) =
super_setup_bdi_name(&sb, name);
], [super_setup_bdi_name], [fs/super.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SUPER_SETUP_BDI_NAME, 1,
[super_setup_bdi_name() exits])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING(
[whether bdi_setup_and_register() wants 2 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 2 args])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING(
[whether bdi_setup_and_register() wants 3 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
unsigned int cap = BDI_CAP_MAP_COPY;
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name, cap);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_3ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 3 args])
], [
AC_MSG_RESULT(no)
])
])
])
])

2
config/kernel.m4
View File

@ -100,7 +100,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
ZFS_AC_KERNEL_S_D_OP
ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
ZFS_AC_KERNEL_BDI
ZFS_AC_KERNEL_SET_NLINK
ZFS_AC_KERNEL_ELEVATOR_CHANGE
ZFS_AC_KERNEL_5ARG_SGET

87
include/linux/vfs_compat.h
View File

@ -70,45 +70,114 @@ truncate_setsize(struct inode *ip, loff_t new)
/*
* 2.6.32 - 2.6.33, bdi_setup_and_register() is not available.
* 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
* 4.0 - x.y, bdi_setup_and_register() takes 2 arguments.
* 4.0 - 4.11, bdi_setup_and_register() takes 2 arguments.
* 4.12 - x.y, super_setup_bdi_name() new interface.
*/
#if defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER)
#if defined(HAVE_SUPER_SETUP_BDI_NAME)
static inline int
zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
zpl_bdi_setup(struct super_block *sb, char *name)
{
return (bdi_setup_and_register(bdi, name));
return (super_setup_bdi_name(sb, name));
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
}
#elif defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER)
static inline int
zpl_bdi_setup(struct super_block *sb, char *name)
{
struct backing_dev_info *bdi;
int error;
bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
error = bdi_setup_and_register(bdi, name);
if (error) {
kmem_free(bdi, sizeof (struct backing_dev_info));
return (error);
}
sb->s_bdi = bdi;
return (0);
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
struct backing_dev_info *bdi = sb->s_bdi;
bdi_destroy(bdi);
kmem_free(bdi, sizeof (struct backing_dev_info));
sb->s_bdi = NULL;
}
#elif defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER)
static inline int
zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
zpl_bdi_setup(struct super_block *sb, char *name)
{
return (bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY));
struct backing_dev_info *bdi;
int error;
bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
error = bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY);
if (error) {
kmem_free(sb->s_bdi, sizeof (struct backing_dev_info));
return (error);
}
sb->s_bdi = bdi;
return (0);
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
struct backing_dev_info *bdi = sb->s_bdi;
bdi_destroy(bdi);
kmem_free(bdi, sizeof (struct backing_dev_info));
sb->s_bdi = NULL;
}
#else
extern atomic_long_t zfs_bdi_seq;
static inline int
zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
zpl_bdi_setup(struct super_block *sb, char *name)
{
struct backing_dev_info *bdi;
char tmp[32];
int error;
bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
bdi->name = name;
bdi->capabilities = BDI_CAP_MAP_COPY;
error = bdi_init(bdi);
if (error)
if (error) {
kmem_free(bdi, sizeof (struct backing_dev_info));
return (error);
}
sprintf(tmp, "%.28s%s", name, "-%d");
error = bdi_register(bdi, NULL, tmp,
atomic_long_inc_return(&zfs_bdi_seq));
if (error) {
bdi_destroy(bdi);
kmem_free(bdi, sizeof (struct backing_dev_info));
return (error);
}
return (error);
sb->s_bdi = bdi;
return (0);
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
struct backing_dev_info *bdi = sb->s_bdi;
bdi_destroy(bdi);
kmem_free(bdi, sizeof (struct backing_dev_info));
sb->s_bdi = NULL;
}
#endif

1
include/sys/zfs_vfsops.h
View File

@ -75,7 +75,6 @@ typedef struct zfs_mnt {
struct zfsvfs {
vfs_t *z_vfs; /* generic fs struct */
struct super_block *z_sb; /* generic super_block */
struct backing_dev_info z_bdi; /* generic backing dev info */
struct zfsvfs *z_parent; /* parent fs */
objset_t *z_os; /* objset reference */
uint64_t z_flags; /* super_block flags */

11
module/zfs/zfs_vfsops.c
View File

@ -1568,7 +1568,8 @@ zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
return (0);
}
#if !defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER) && \
#if !defined(HAVE_SUPER_SETUP_BDI_NAME) && \
!defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER) && \
!defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER)
atomic_long_t zfs_bdi_seq = ATOMIC_LONG_INIT(0);
#endif
@ -1605,13 +1606,13 @@ zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent)
sb->s_time_gran = 1;
sb->s_blocksize = recordsize;
sb->s_blocksize_bits = ilog2(recordsize);
zfsvfs->z_bdi.ra_pages = 0;
sb->s_bdi = &zfsvfs->z_bdi;
error = -zpl_bdi_setup_and_register(&zfsvfs->z_bdi, "zfs");
error = -zpl_bdi_setup(sb, "zfs");
if (error)
goto out;
sb->s_bdi->ra_pages = 0;
/* Set callback operations for the file system. */
sb->s_op = &zpl_super_operations;
sb->s_xattr = zpl_xattr_handlers;
@ -1732,7 +1733,7 @@ zfs_umount(struct super_block *sb)
arc_remove_prune_callback(zfsvfs->z_arc_prune);
VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0);
os = zfsvfs->z_os;
bdi_destroy(sb->s_bdi);
zpl_bdi_destroy(sb);
/*
* z_os will be NULL if there was an error in