diff options
| author | Richard Yao <[email protected]> | 2012-07-23 11:39:25 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2012-07-23 12:29:36 -0700 |
| commit | 739a1a82e0f366923e8d9bc8f9ad4b1c680a780b (patch) | |
| tree | 33d846b16ea8ddaf39bb77a8658e63d640794fee /config/kernel-clear-inode.m4 | |
| parent | ea1fdf46e2d37e9eb048f9add0fb06e77e9ee6e2 (diff) | |
Linux 3.5 compat, end_writeback() changed to clear_inode()
The end_writeback() function was changed by moving the call to
inode_sync_wait() earlier in to evict(). This effecitvely changes
the ordering of the sync but it does not impact the details of
the zfs implementation.
However, as part of this change end_writeback() was renamed to
clear_inode() to reflect the new semantics. This change does
impact us and clear_inode() now maps to end_writeback() for
kernels prior to 3.5.
Signed-off-by: Richard Yao <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #784
Diffstat (limited to 'config/kernel-clear-inode.m4')
| -rw-r--r-- | config/kernel-clear-inode.m4 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/config/kernel-clear-inode.m4 b/config/kernel-clear-inode.m4 new file mode 100644 index 000000000..e3eace2b2 --- /dev/null +++ b/config/kernel-clear-inode.m4 @@ -0,0 +1,29 @@ +dnl # +dnl # 3.5.0 API change +dnl # torvalds/linux@dbd5768f87ff6fb0a4fe09c4d7b6c4a24de99430 and +dnl # torvalds/linux@7994e6f7254354e03028a11f98a27bd67dace9f1 reworked +dnl # where inode_sync_wait() is called. +dnl # +dnl # Prior to these changes it would occur in end_writeback() but due +dnl # to various issues (described in the above commits) it has been +dnl # moved to evict(). This changes the ordering is which sync occurs +dnl # but otherwise doesn't impact the zpl implementation. +dnl # +dnl # The major impact here is the renaming of end_writeback() to +dnl # clear_inode(). However, care must be taken when detecting this +dnl # API change because as recently as 2.6.35 there was a clear_inode() +dnl # function. However, it was made obsolete by the evict_inode() API +dnl # change at the same time. +dnl # +dnl # Therefore, to ensure we have the correct API we only allow the +dnl # clear_inode() compatibility code to be defined iff the evict_inode() +dnl # functionality is also detected. +dnl # +AC_DEFUN([ZFS_AC_KERNEL_CLEAR_INODE], [ + ZFS_CHECK_SYMBOL_EXPORT( + [clear_inode], + [fs/inode.c], + [AC_DEFINE(HAVE_CLEAR_INODE, 1, + [clear_inode() is available])], + []) +]) |