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authorTejun Heo <tj@kernel.org>2013-09-11 22:29:04 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-09-26 17:50:01 -0400
commit58292cbe6669d74498a5f08db13e57cb3bcfb81d (patch)
treebe6ed2b906a9796c58be9ff21251e124bf01ddcb /fs/sysfs/sysfs.h
parentbcac3769ca6d6278f93afb6cc2b234d260ee5951 (diff)
sysfs: make attr namespace interface less convoluted
sysfs ns (namespace) implementation became more convoluted than necessary while trying to hide ns information from visible interface. The relatively recent attr ns support is a good example. * attr ns tag is determined by sysfs_ops->namespace() callback while dir tag is determined by kobj_type->namespace(). The placement is arbitrary. * Instead of performing operations with explicit ns tag, the namespace callback is routed through sysfs_attr_ns(), sysfs_ops->namespace(), class_attr_namespace(), class_attr->namespace(). It's not simpler in any sense. The only thing this convolution does is traversing the whole stack backwards. The namespace callbacks are unncessary because the operations involved are inherently synchronous. The information can be provided in in straight-forward top-down direction and reversing that direction is unnecessary and against basic design principles. This backward interface is unnecessarily convoluted and hinders properly separating out sysfs from driver model / kobject for proper layering. This patch updates attr ns support such that * sysfs_ops->namespace() and class_attr->namespace() are dropped. * sysfs_{create|remove}_file_ns(), which take explicit @ns param, are added and sysfs_{create|remove}_file() are now simple wrappers around the ns aware functions. * ns handling is dropped from sysfs_chmod_file(). Nobody uses it at this point. sysfs_chmod_file_ns() can be added later if necessary. * Explicit @ns is propagated through class_{create|remove}_file_ns() and netdev_class_{create|remove}_file_ns(). * driver/net/bonding which is currently the only user of attr namespace is updated to use netdev_class_{create|remove}_file_ns() with @bh->net as the ns tag instead of using the namespace callback. This patch should be an equivalent conversion without any functional difference. It makes the code easier to follow, reduces lines of code a bit and helps proper separation and layering. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Kay Sievers <kay@vrfy.org> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/sysfs/sysfs.h')
-rw-r--r--fs/sysfs/sysfs.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index b6deca3e301d..a96da2559db2 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -230,8 +230,9 @@ extern const struct file_operations sysfs_file_operations;
230int sysfs_add_file(struct sysfs_dirent *dir_sd, 230int sysfs_add_file(struct sysfs_dirent *dir_sd,
231 const struct attribute *attr, int type); 231 const struct attribute *attr, int type);
232 232
233int sysfs_add_file_mode(struct sysfs_dirent *dir_sd, 233int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
234 const struct attribute *attr, int type, umode_t amode); 234 const struct attribute *attr, int type,
235 umode_t amode, const void *ns);
235/* 236/*
236 * bin.c 237 * bin.c
237 */ 238 */