diff options
| author | Yuxuan Shui <[email protected]> | 2012-10-11 22:41:33 +0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2012-10-14 16:26:21 -0700 |
| commit | bcb15891ab394e11615eee08bba1fd85ac32e158 (patch) | |
| tree | ae6bc520ef7ce3210d1556229a28e5676299c06e /config | |
| parent | dea3505dff1252b337eb1cb8744626fb0f796d86 (diff) | |
Linux 3.6 compat, kern_path_locked() added
The kern_path_parent() function was removed from Linux 3.6 because
it was observed that all the callers just want the parent dentry.
The simpler kern_path_locked() function replaces kern_path_parent()
and does the lookup while holding the ->i_mutex lock.
This is good news for the vn implementation because it removes the
need for us to handle the locking. However, it makes it harder to
implement a single readable vn_remove()/vn_rename() function which
is usually what we prefer.
Therefore, we implement a new version of vn_remove()/vn_rename()
for Linux 3.6 and newer kernels. This allows us to leave the
existing working implementation untouched, and to add a simpler
version for newer kernels.
Long term I would very much like to see all of the vn code removed
since what this code enabled is generally frowned upon in the kernel.
But that can't happen util we either abondon the zpool.cache file
or implement alternate infrastructure to update is correctly in
user space.
Signed-off-by: Yuxuan Shui <[email protected]>
Signed-off-by: Richard Yao <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #154
Diffstat (limited to 'config')
| -rw-r--r-- | config/spl-build.m4 | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/config/spl-build.m4 b/config/spl-build.m4 index 0c7a03cf1..eb644a188 100644 --- a/config/spl-build.m4 +++ b/config/spl-build.m4 @@ -86,6 +86,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [ SPL_AC_SHRINK_ICACHE_MEMORY SPL_AC_KERN_PATH_PARENT_HEADER SPL_AC_KERN_PATH_PARENT_SYMBOL + SPL_AC_KERN_PATH_LOCKED SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE SPL_AC_SHRINK_CONTROL_STRUCT SPL_AC_RWSEM_SPINLOCK_IS_RAW @@ -2188,6 +2189,21 @@ AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL], ]) dnl # +dnl # 3.6 API compat, +dnl # The kern_path_parent() function was replaced by the kern_path_locked() +dnl # function to eliminate all struct nameidata usage outside fs/namei.c. +dnl # +AC_DEFUN([SPL_AC_KERN_PATH_LOCKED], [ + SPL_CHECK_SYMBOL_HEADER( + [kern_path_locked], + [struct dentry \*kern_path_locked(const char \*, struct path \*)], + [include/linux/namei.h], + [AC_DEFINE(HAVE_KERN_PATH_LOCKED, 1, + [kern_path_locked() is available])], + []) +]) + +dnl # dnl # 2.6.39 API compat, dnl # The function zlib_deflate_workspacesize() now take 2 arguments. dnl # This was done to avoid always having to allocate the maximum size |