Hello, all.
This is the fourth patchset of four sysfs update patchset series[1]
and to be applied on top of the third patchset[2].
This patchset implements the following new features.
* Notify pollers on file deactivation.
* Name-formatting for symlinks. e.g. symlink pointing to
/dira/dirb/leaf can be named as "symlink:%1-%0" and it will show up
as "symlink:dirb-leaf". This only applies when new interface is
used.
* Autoremoval of symlinks when target is removed. This only applies
when new interface is used.
* Autorenaming of symlinks according to the name format string when
target or one of its ancestors is renamed or moved. This only
applies when new interface is used.
* Plugged operations. Sysfs users can plug top node and build subtree
gradually without revealing the process to userland. When subtree
is fully constructed, the top node can be unplugged and userland
will see completely built subtree appearing at once. If subtree
creation fails in the process, the whole subtree can be removed by
simply removing the top node. There won't be any userland
noticeable event. This is to be combined with uevent_suppress
mechanism of driver model.
* Batch error handling. A plugged node accumulates any error
condition occurring below it and can return the first error when
asked. Also, all interface functions accepth ERR_PTR() value as
sysfs_dirent parameter. This means that constructs like the
following can be used to replace the current group interface.
<<-- code -->>
group = sysfs_add_dir(parent, "group_name", 0777 | SYSFS_PLUGGED, NULL);
sysfs_add_file(group, "file0", 0777, file0_ops, file0_data);
sysfs_add_file(group, "file1", 0777, file1_ops, file1_data);
...
sysfs_add_file(group, "fileN", 0777, fileN_ops, fileN_data);
rc = sysfs_check_batch_error(group);
if (rc) {
sysfs_remove(group);
return rc;
}
sysfs_unplug(group);
return 0;
<<-- end of code -->>
The above will create a subdirectory "group_name" which contains N
files and show them atomically to userland or remove them without
letting userland notice if any failure happens. This will simplify
sysfs users quite a bit (not only for groups, other stuff too).
This patchset contains the following 8 patches.
0001-sysfs-notify-file-on-deactivation.patch
0002-sysfs-add-name-formatting-support-for-symlinks.patch
0003-sysfs-chain-symlinks-to-their-targets.patch
0004-sysfs-implement-symlink-auto-removal.patch
0005-sysfs-implement-symlink-auto-rename.patch
0006-sysfs-implement-plugged-creation-of-sysfs-nodes.patch
0007-sysfs-implement-batch-error-handling.patch
0008-sysfs-add-copyrights.patch
0001 implements notification on file deactivation. 0002-0005
implement symlink name formatting, autoremoving and autorenaming.
0006 implements plugged creation. 0007 batch error handling, and 0008
adds copyright notices on top of all sysfs header and source files.
Thanks.
--
tejun
[1] http://thread.gmane.org/gmane.linux.kernel/582105
[2] http://thread.gmane.org/gmane.linux.kernel/582147
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