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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
567 lines
15 KiB
C
567 lines
15 KiB
C
/*
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* Enclosure Services
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*
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* Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
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*
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**-----------------------------------------------------------------------------
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** version 2 as published by the Free Software Foundation.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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**-----------------------------------------------------------------------------
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*/
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#include <linux/device.h>
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#include <linux/enclosure.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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static LIST_HEAD(container_list);
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static DEFINE_MUTEX(container_list_lock);
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static struct class enclosure_class;
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/**
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* enclosure_find - find an enclosure given a parent device
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* @dev: the parent to match against
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* @start: Optional enclosure device to start from (NULL if none)
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*
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* Looks through the list of registered enclosures to find all those
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* with @dev as a parent. Returns NULL if no enclosure is
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* found. @start can be used as a starting point to obtain multiple
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* enclosures per parent (should begin with NULL and then be set to
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* each returned enclosure device). Obtains a reference to the
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* enclosure class device which must be released with device_put().
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* If @start is not NULL, a reference must be taken on it which is
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* released before returning (this allows a loop through all
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* enclosures to exit with only the reference on the enclosure of
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* interest held). Note that the @dev may correspond to the actual
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* device housing the enclosure, in which case no iteration via @start
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* is required.
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*/
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struct enclosure_device *enclosure_find(struct device *dev,
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struct enclosure_device *start)
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{
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struct enclosure_device *edev;
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mutex_lock(&container_list_lock);
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edev = list_prepare_entry(start, &container_list, node);
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if (start)
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put_device(&start->edev);
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list_for_each_entry_continue(edev, &container_list, node) {
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struct device *parent = edev->edev.parent;
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/* parent might not be immediate, so iterate up to
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* the root of the tree if necessary */
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while (parent) {
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if (parent == dev) {
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get_device(&edev->edev);
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mutex_unlock(&container_list_lock);
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return edev;
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}
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parent = parent->parent;
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}
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}
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mutex_unlock(&container_list_lock);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(enclosure_find);
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/**
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* enclosure_for_each_device - calls a function for each enclosure
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* @fn: the function to call
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* @data: the data to pass to each call
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*
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* Loops over all the enclosures calling the function.
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*
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* Note, this function uses a mutex which will be held across calls to
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* @fn, so it must have non atomic context, and @fn may (although it
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* should not) sleep or otherwise cause the mutex to be held for
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* indefinite periods
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*/
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int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *),
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void *data)
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{
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int error = 0;
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struct enclosure_device *edev;
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mutex_lock(&container_list_lock);
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list_for_each_entry(edev, &container_list, node) {
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error = fn(edev, data);
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if (error)
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break;
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}
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mutex_unlock(&container_list_lock);
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return error;
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}
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EXPORT_SYMBOL_GPL(enclosure_for_each_device);
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/**
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* enclosure_register - register device as an enclosure
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*
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* @dev: device containing the enclosure
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* @components: number of components in the enclosure
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*
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* This sets up the device for being an enclosure. Note that @dev does
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* not have to be a dedicated enclosure device. It may be some other type
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* of device that additionally responds to enclosure services
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*/
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struct enclosure_device *
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enclosure_register(struct device *dev, const char *name, int components,
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struct enclosure_component_callbacks *cb)
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{
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struct enclosure_device *edev =
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kzalloc(sizeof(struct enclosure_device) +
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sizeof(struct enclosure_component)*components,
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GFP_KERNEL);
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int err, i;
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BUG_ON(!cb);
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if (!edev)
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return ERR_PTR(-ENOMEM);
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edev->components = components;
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edev->edev.class = &enclosure_class;
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edev->edev.parent = get_device(dev);
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edev->cb = cb;
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dev_set_name(&edev->edev, "%s", name);
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err = device_register(&edev->edev);
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if (err)
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goto err;
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for (i = 0; i < components; i++)
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edev->component[i].number = -1;
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mutex_lock(&container_list_lock);
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list_add_tail(&edev->node, &container_list);
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mutex_unlock(&container_list_lock);
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return edev;
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err:
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put_device(edev->edev.parent);
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kfree(edev);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(enclosure_register);
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static struct enclosure_component_callbacks enclosure_null_callbacks;
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/**
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* enclosure_unregister - remove an enclosure
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*
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* @edev: the registered enclosure to remove;
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*/
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void enclosure_unregister(struct enclosure_device *edev)
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{
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int i;
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mutex_lock(&container_list_lock);
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list_del(&edev->node);
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mutex_unlock(&container_list_lock);
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for (i = 0; i < edev->components; i++)
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if (edev->component[i].number != -1)
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device_unregister(&edev->component[i].cdev);
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/* prevent any callbacks into service user */
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edev->cb = &enclosure_null_callbacks;
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device_unregister(&edev->edev);
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}
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EXPORT_SYMBOL_GPL(enclosure_unregister);
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#define ENCLOSURE_NAME_SIZE 64
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static void enclosure_link_name(struct enclosure_component *cdev, char *name)
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{
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strcpy(name, "enclosure_device:");
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strcat(name, dev_name(&cdev->cdev));
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}
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static void enclosure_remove_links(struct enclosure_component *cdev)
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{
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char name[ENCLOSURE_NAME_SIZE];
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enclosure_link_name(cdev, name);
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sysfs_remove_link(&cdev->dev->kobj, name);
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sysfs_remove_link(&cdev->cdev.kobj, "device");
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}
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static int enclosure_add_links(struct enclosure_component *cdev)
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{
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int error;
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char name[ENCLOSURE_NAME_SIZE];
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error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device");
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if (error)
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return error;
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enclosure_link_name(cdev, name);
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error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name);
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if (error)
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sysfs_remove_link(&cdev->cdev.kobj, "device");
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return error;
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}
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static void enclosure_release(struct device *cdev)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev);
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put_device(cdev->parent);
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kfree(edev);
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}
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static void enclosure_component_release(struct device *dev)
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{
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struct enclosure_component *cdev = to_enclosure_component(dev);
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if (cdev->dev) {
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enclosure_remove_links(cdev);
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put_device(cdev->dev);
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}
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put_device(dev->parent);
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}
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static const struct attribute_group *enclosure_groups[];
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/**
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* enclosure_component_register - add a particular component to an enclosure
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* @edev: the enclosure to add the component
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* @num: the device number
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* @type: the type of component being added
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* @name: an optional name to appear in sysfs (leave NULL if none)
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*
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* Registers the component. The name is optional for enclosures that
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* give their components a unique name. If not, leave the field NULL
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* and a name will be assigned.
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*
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* Returns a pointer to the enclosure component or an error.
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*/
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struct enclosure_component *
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enclosure_component_register(struct enclosure_device *edev,
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unsigned int number,
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enum enclosure_component_type type,
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const char *name)
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{
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struct enclosure_component *ecomp;
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struct device *cdev;
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int err;
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if (number >= edev->components)
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return ERR_PTR(-EINVAL);
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ecomp = &edev->component[number];
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if (ecomp->number != -1)
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return ERR_PTR(-EINVAL);
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ecomp->type = type;
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ecomp->number = number;
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cdev = &ecomp->cdev;
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cdev->parent = get_device(&edev->edev);
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if (name && name[0])
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dev_set_name(cdev, "%s", name);
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else
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dev_set_name(cdev, "%u", number);
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cdev->release = enclosure_component_release;
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cdev->groups = enclosure_groups;
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err = device_register(cdev);
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if (err)
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ERR_PTR(err);
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return ecomp;
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}
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EXPORT_SYMBOL_GPL(enclosure_component_register);
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/**
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* enclosure_add_device - add a device as being part of an enclosure
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* @edev: the enclosure device being added to.
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* @num: the number of the component
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* @dev: the device being added
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*
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* Declares a real device to reside in slot (or identifier) @num of an
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* enclosure. This will cause the relevant sysfs links to appear.
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* This function may also be used to change a device associated with
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* an enclosure without having to call enclosure_remove_device() in
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* between.
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*
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* Returns zero on success or an error.
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*/
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int enclosure_add_device(struct enclosure_device *edev, int component,
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struct device *dev)
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{
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struct enclosure_component *cdev;
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if (!edev || component >= edev->components)
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return -EINVAL;
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cdev = &edev->component[component];
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if (cdev->dev == dev)
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return -EEXIST;
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if (cdev->dev)
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enclosure_remove_links(cdev);
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put_device(cdev->dev);
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cdev->dev = get_device(dev);
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return enclosure_add_links(cdev);
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}
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EXPORT_SYMBOL_GPL(enclosure_add_device);
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/**
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* enclosure_remove_device - remove a device from an enclosure
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* @edev: the enclosure device
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* @num: the number of the component to remove
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*
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* Returns zero on success or an error.
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*
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*/
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int enclosure_remove_device(struct enclosure_device *edev, struct device *dev)
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{
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struct enclosure_component *cdev;
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int i;
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if (!edev || !dev)
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return -EINVAL;
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for (i = 0; i < edev->components; i++) {
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cdev = &edev->component[i];
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if (cdev->dev == dev) {
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enclosure_remove_links(cdev);
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device_del(&cdev->cdev);
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put_device(dev);
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cdev->dev = NULL;
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return device_add(&cdev->cdev);
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}
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(enclosure_remove_device);
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/*
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* sysfs pieces below
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*/
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static ssize_t enclosure_show_components(struct device *cdev,
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struct device_attribute *attr,
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char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev);
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return snprintf(buf, 40, "%d\n", edev->components);
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}
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static struct device_attribute enclosure_attrs[] = {
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__ATTR(components, S_IRUGO, enclosure_show_components, NULL),
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__ATTR_NULL
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};
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static struct class enclosure_class = {
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.name = "enclosure",
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.owner = THIS_MODULE,
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.dev_release = enclosure_release,
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.dev_attrs = enclosure_attrs,
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};
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static const char *const enclosure_status [] = {
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[ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported",
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[ENCLOSURE_STATUS_OK] = "OK",
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[ENCLOSURE_STATUS_CRITICAL] = "critical",
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[ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical",
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[ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable",
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[ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
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[ENCLOSURE_STATUS_UNKNOWN] = "unknown",
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[ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
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[ENCLOSURE_STATUS_MAX] = NULL,
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};
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static const char *const enclosure_type [] = {
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[ENCLOSURE_COMPONENT_DEVICE] = "device",
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[ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
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};
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static ssize_t get_component_fault(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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if (edev->cb->get_fault)
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edev->cb->get_fault(edev, ecomp);
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return snprintf(buf, 40, "%d\n", ecomp->fault);
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}
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static ssize_t set_component_fault(struct device *cdev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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int val = simple_strtoul(buf, NULL, 0);
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if (edev->cb->set_fault)
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edev->cb->set_fault(edev, ecomp, val);
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return count;
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}
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static ssize_t get_component_status(struct device *cdev,
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struct device_attribute *attr,char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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if (edev->cb->get_status)
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edev->cb->get_status(edev, ecomp);
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return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
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}
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static ssize_t set_component_status(struct device *cdev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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int i;
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for (i = 0; enclosure_status[i]; i++) {
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if (strncmp(buf, enclosure_status[i],
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strlen(enclosure_status[i])) == 0 &&
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(buf[strlen(enclosure_status[i])] == '\n' ||
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buf[strlen(enclosure_status[i])] == '\0'))
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break;
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}
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if (enclosure_status[i] && edev->cb->set_status) {
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edev->cb->set_status(edev, ecomp, i);
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return count;
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} else
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return -EINVAL;
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}
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static ssize_t get_component_active(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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if (edev->cb->get_active)
|
|
edev->cb->get_active(edev, ecomp);
|
|
return snprintf(buf, 40, "%d\n", ecomp->active);
|
|
}
|
|
|
|
static ssize_t set_component_active(struct device *cdev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
|
|
struct enclosure_component *ecomp = to_enclosure_component(cdev);
|
|
int val = simple_strtoul(buf, NULL, 0);
|
|
|
|
if (edev->cb->set_active)
|
|
edev->cb->set_active(edev, ecomp, val);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t get_component_locate(struct device *cdev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
|
|
struct enclosure_component *ecomp = to_enclosure_component(cdev);
|
|
|
|
if (edev->cb->get_locate)
|
|
edev->cb->get_locate(edev, ecomp);
|
|
return snprintf(buf, 40, "%d\n", ecomp->locate);
|
|
}
|
|
|
|
static ssize_t set_component_locate(struct device *cdev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
|
|
struct enclosure_component *ecomp = to_enclosure_component(cdev);
|
|
int val = simple_strtoul(buf, NULL, 0);
|
|
|
|
if (edev->cb->set_locate)
|
|
edev->cb->set_locate(edev, ecomp, val);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t get_component_type(struct device *cdev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct enclosure_component *ecomp = to_enclosure_component(cdev);
|
|
|
|
return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
|
|
}
|
|
|
|
|
|
static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
|
|
set_component_fault);
|
|
static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
|
|
set_component_status);
|
|
static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
|
|
set_component_active);
|
|
static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
|
|
set_component_locate);
|
|
static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
|
|
|
|
static struct attribute *enclosure_component_attrs[] = {
|
|
&dev_attr_fault.attr,
|
|
&dev_attr_status.attr,
|
|
&dev_attr_active.attr,
|
|
&dev_attr_locate.attr,
|
|
&dev_attr_type.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group enclosure_group = {
|
|
.attrs = enclosure_component_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *enclosure_groups[] = {
|
|
&enclosure_group,
|
|
NULL
|
|
};
|
|
|
|
static int __init enclosure_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = class_register(&enclosure_class);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit enclosure_exit(void)
|
|
{
|
|
class_unregister(&enclosure_class);
|
|
}
|
|
|
|
module_init(enclosure_init);
|
|
module_exit(enclosure_exit);
|
|
|
|
MODULE_AUTHOR("James Bottomley");
|
|
MODULE_DESCRIPTION("Enclosure Services");
|
|
MODULE_LICENSE("GPL v2");
|