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Linux 2.6.36 compat, fs_struct->lock type change

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In the linux-2.6.36 kernel the fs_struct lock was changed from a
rwlock_t to a spinlock_t.  If the kernel would export the set_fs_pwd()
symbol by default this would not have caused us any issues, but they
don't.  So we're forced to add a new autoconf check which sets the
HAVE_FS_STRUCT_SPINLOCK define when a spinlock_t is used.  We can
then correctly use either spin_lock or write_lock in our custom
set_fs_pwd() implementation.
This commit is contained in:
Brian Behlendorf
2010-11-09 11:15:32 -08:00
parent a50cede388
commit 9b2048c26b
4 changed files with 176 additions and 8 deletions
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config/spl-build.m4
+23
View File
@@ -66,6 +66,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_2ARGS_SET_FS_PWD
SPL_AC_2ARGS_VFS_UNLINK
SPL_AC_4ARGS_VFS_RENAME
SPL_AC_FS_STRUCT_SPINLOCK
SPL_AC_CRED_STRUCT
SPL_AC_GROUPS_SEARCH
SPL_AC_PUT_TASK_STRUCT
@@ -1547,6 +1548,28 @@ AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
])
])
dnl #
dnl # 2.6.36 API change,
dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
dnl # a spinlock_t to improve the fastpath performance.
dnl #
AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
SPL_LINUX_TRY_COMPILE([
#include <linux/sched.h>
#include <linux/fs_struct.h>
],[
struct fs_struct fs;
spin_lock_init(&fs.lock);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
[struct fs_struct uses spinlock_t])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.29 API change,
dnl # check whether 'struct cred' exists