[Devel] patch sysfs-remove-first-pass-at-shadow-directory-support.patch added to gregkh-2.6 tree
gregkh at suse.de
gregkh at suse.de
Fri Jul 20 23:36:28 PDT 2007
This is a note to let you know that I've just added the patch titled
Subject: [PATCH 1/4] sysfs: Remove first pass at shadow directory support
to my gregkh-2.6 tree. Its filename is
sysfs-remove-first-pass-at-shadow-directory-support.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From ebiederm at xmission.com Fri Jul 20 23:20:07 2007
From: ebiederm at xmission.com (Eric W. Biederman)
Date: Wed, 18 Jul 2007 22:43:46 -0600
Subject: [PATCH 1/4] sysfs: Remove first pass at shadow directory support
To: Greg KH <greg at kroah.com>
Cc: Greg KH <gregkh at suse.de>, Dave Hansen <hansendc at us.ibm.com>, Benjamin Thery <benjamin.thery at bull.net>, Linux Containers <containers at lists.osdl.org>, Tejun Heo <htejun at gmail.com>
Message-ID: <m14pk13svx.fsf at ebiederm.dsl.xmission.com>
While shadow directories appear to be a good idea, the current scheme
of controlling their creation and destruction outside of sysfs appears
to be a locking and maintenance nightmare in the face of sysfs
directories dynamically coming and going. Which can now occur for
directories containing network devices when CONFIG_SYSFS_DEPRECATED is
not set.
This patch removes everything from the initial shadow directory support
that allowed the shadow directory creation to be controlled at a higher
level. So except for a few bits of sysfs_rename_dir everything from
commit b592fcfe7f06c15ec11774b5be7ce0de3aa86e73 is now gone.
Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
fs/sysfs/dir.c | 167 ++++++------------------------------------------
fs/sysfs/group.c | 1
fs/sysfs/inode.c | 10 --
fs/sysfs/mount.c | 2
fs/sysfs/sysfs.h | 6 -
include/linux/kobject.h | 5 -
include/linux/sysfs.h | 27 +------
lib/kobject.c | 44 +-----------
8 files changed, 33 insertions(+), 229 deletions(-)
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -569,9 +569,6 @@ static void sysfs_drop_dentry(struct sys
spin_unlock(&dcache_lock);
spin_unlock(&sysfs_assoc_lock);
- /* dentries for shadowed inodes are pinned, unpin */
- if (dentry && sysfs_is_shadowed_inode(dentry->d_inode))
- dput(dentry);
dput(dentry);
/* adjust nlink and update timestamp */
@@ -723,19 +720,15 @@ int sysfs_create_subdir(struct kobject *
/**
* sysfs_create_dir - create a directory for an object.
* @kobj: object we're creating directory for.
- * @shadow_parent: parent object.
*/
-int sysfs_create_dir(struct kobject *kobj,
- struct sysfs_dirent *shadow_parent_sd)
+int sysfs_create_dir(struct kobject * kobj)
{
struct sysfs_dirent *parent_sd, *sd;
int error = 0;
BUG_ON(!kobj);
- if (shadow_parent_sd)
- parent_sd = shadow_parent_sd;
- else if (kobj->parent)
+ if (kobj->parent)
parent_sd = kobj->parent->sd;
else if (sysfs_mount && sysfs_mount->mnt_sb)
parent_sd = sysfs_mount->mnt_sb->s_root->d_fsdata;
@@ -887,45 +880,44 @@ void sysfs_remove_dir(struct kobject * k
__sysfs_remove_dir(sd);
}
-int sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
- const char *new_name)
+int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
{
- struct sysfs_dirent *sd = kobj->sd;
- struct dentry *new_parent = NULL;
+ struct sysfs_dirent *sd;
+ struct dentry *parent = NULL;
struct dentry *old_dentry = NULL, *new_dentry = NULL;
+ struct sysfs_dirent *parent_sd;
const char *dup_name = NULL;
int error;
+ if (!kobj->parent)
+ return -EINVAL;
+
/* get dentries */
+ sd = kobj->sd;
old_dentry = sysfs_get_dentry(sd);
if (IS_ERR(old_dentry)) {
error = PTR_ERR(old_dentry);
goto out_dput;
}
- new_parent = sysfs_get_dentry(new_parent_sd);
- if (IS_ERR(new_parent)) {
- error = PTR_ERR(new_parent);
+ parent_sd = kobj->parent->sd;
+ parent = sysfs_get_dentry(parent_sd);
+ if (IS_ERR(parent)) {
+ error = PTR_ERR(parent);
goto out_dput;
}
- /* lock new_parent and get dentry for new name */
- mutex_lock(&new_parent->d_inode->i_mutex);
+ /* lock parent and get dentry for new name */
+ mutex_lock(&parent->d_inode->i_mutex);
- new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name));
+ new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
if (IS_ERR(new_dentry)) {
error = PTR_ERR(new_dentry);
goto out_unlock;
}
- /* By allowing two different directories with the same
- * d_parent we allow this routine to move between different
- * shadows of the same directory
- */
error = -EINVAL;
- if (old_dentry->d_parent->d_inode != new_parent->d_inode ||
- new_dentry->d_parent->d_inode != new_parent->d_inode ||
- old_dentry == new_dentry)
+ if (old_dentry == new_dentry)
goto out_unlock;
error = -EEXIST;
@@ -952,9 +944,9 @@ int sysfs_rename_dir(struct kobject *kob
mutex_lock(&sysfs_mutex);
sysfs_unlink_sibling(sd);
- sysfs_get(new_parent_sd);
+ sysfs_get(parent_sd);
sysfs_put(sd->s_parent);
- sd->s_parent = new_parent_sd;
+ sd->s_parent = parent_sd;
sysfs_link_sibling(sd);
mutex_unlock(&sysfs_mutex);
@@ -965,10 +957,10 @@ int sysfs_rename_dir(struct kobject *kob
out_drop:
d_drop(new_dentry);
out_unlock:
- mutex_unlock(&new_parent->d_inode->i_mutex);
+ mutex_unlock(&parent->d_inode->i_mutex);
out_dput:
kfree(dup_name);
- dput(new_parent);
+ dput(parent);
dput(old_dentry);
dput(new_dentry);
return error;
@@ -1189,121 +1181,6 @@ static loff_t sysfs_dir_lseek(struct fil
return offset;
}
-
-/**
- * sysfs_make_shadowed_dir - Setup so a directory can be shadowed
- * @kobj: object we're creating shadow of.
- */
-
-int sysfs_make_shadowed_dir(struct kobject *kobj,
- void * (*follow_link)(struct dentry *, struct nameidata *))
-{
- struct dentry *dentry;
- struct inode *inode;
- struct inode_operations *i_op;
-
- /* get dentry for @kobj->sd, dentry of a shadowed dir is pinned */
- dentry = sysfs_get_dentry(kobj->sd);
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
-
- inode = dentry->d_inode;
- if (inode->i_op != &sysfs_dir_inode_operations) {
- dput(dentry);
- return -EINVAL;
- }
-
- i_op = kmalloc(sizeof(*i_op), GFP_KERNEL);
- if (!i_op)
- return -ENOMEM;
-
- memcpy(i_op, &sysfs_dir_inode_operations, sizeof(*i_op));
- i_op->follow_link = follow_link;
-
- /* Locking of inode->i_op?
- * Since setting i_op is a single word write and they
- * are atomic we should be ok here.
- */
- inode->i_op = i_op;
- return 0;
-}
-
-/**
- * sysfs_create_shadow_dir - create a shadow directory for an object.
- * @kobj: object we're creating directory for.
- *
- * sysfs_make_shadowed_dir must already have been called on this
- * directory.
- */
-
-struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj)
-{
- struct sysfs_dirent *parent_sd = kobj->sd->s_parent;
- struct dentry *dir, *parent, *shadow;
- struct inode *inode;
- struct sysfs_dirent *sd;
- struct sysfs_addrm_cxt acxt;
-
- dir = sysfs_get_dentry(kobj->sd);
- if (IS_ERR(dir)) {
- sd = (void *)dir;
- goto out;
- }
- parent = dir->d_parent;
-
- inode = dir->d_inode;
- sd = ERR_PTR(-EINVAL);
- if (!sysfs_is_shadowed_inode(inode))
- goto out_dput;
-
- shadow = d_alloc(parent, &dir->d_name);
- if (!shadow)
- goto nomem;
-
- sd = sysfs_new_dirent("_SHADOW_", inode->i_mode, SYSFS_DIR);
- if (!sd)
- goto nomem;
- sd->s_elem.dir.kobj = kobj;
-
- sysfs_addrm_start(&acxt, parent_sd);
-
- /* add but don't link into children list */
- sysfs_add_one(&acxt, sd);
-
- /* attach and instantiate dentry */
- sysfs_attach_dentry(sd, shadow);
- d_instantiate(shadow, igrab(inode));
- inc_nlink(inode); /* tj: synchronization? */
-
- sysfs_addrm_finish(&acxt);
-
- dget(shadow); /* Extra count - pin the dentry in core */
-
- goto out_dput;
-
- nomem:
- dput(shadow);
- sd = ERR_PTR(-ENOMEM);
- out_dput:
- dput(dir);
- out:
- return sd;
-}
-
-/**
- * sysfs_remove_shadow_dir - remove an object's directory.
- * @shadow_sd: sysfs_dirent of shadow directory
- *
- * The only thing special about this is that we remove any files in
- * the directory before we remove the directory, and we've inlined
- * what used to be sysfs_rmdir() below, instead of calling separately.
- */
-
-void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd)
-{
- __sysfs_remove_dir(shadow_sd);
-}
-
const struct file_operations sysfs_dir_operations = {
.open = sysfs_dir_open,
.release = sysfs_dir_close,
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -13,7 +13,6 @@
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/err.h>
-#include <linux/fs.h>
#include <asm/semaphore.h>
#include "sysfs.h"
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -34,16 +34,6 @@ static const struct inode_operations sys
.setattr = sysfs_setattr,
};
-void sysfs_delete_inode(struct inode *inode)
-{
- /* Free the shadowed directory inode operations */
- if (sysfs_is_shadowed_inode(inode)) {
- kfree(inode->i_op);
- inode->i_op = NULL;
- }
- return generic_delete_inode(inode);
-}
-
int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
{
struct inode * inode = dentry->d_inode;
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -21,7 +21,7 @@ struct kmem_cache *sysfs_dir_cachep;
static const struct super_operations sysfs_ops = {
.statfs = simple_statfs,
- .drop_inode = sysfs_delete_inode,
+ .drop_inode = generic_delete_inode,
};
struct sysfs_dirent sysfs_root = {
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -70,7 +70,6 @@ extern void sysfs_remove_one(struct sysf
struct sysfs_dirent *sd);
extern int sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
-extern void sysfs_delete_inode(struct inode *inode);
extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
@@ -121,8 +120,3 @@ static inline void sysfs_put(struct sysf
if (sd && atomic_dec_and_test(&sd->s_count))
release_sysfs_dirent(sd);
}
-
-static inline int sysfs_is_shadowed_inode(struct inode *inode)
-{
- return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
-}
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -83,14 +83,9 @@ extern void kobject_init(struct kobject
extern void kobject_cleanup(struct kobject *);
extern int __must_check kobject_add(struct kobject *);
-extern int __must_check kobject_shadow_add(struct kobject *kobj,
- struct sysfs_dirent *shadow_parent);
extern void kobject_del(struct kobject *);
extern int __must_check kobject_rename(struct kobject *, const char *new_name);
-extern int __must_check kobject_shadow_rename(struct kobject *kobj,
- struct sysfs_dirent *new_parent,
- const char *new_name);
extern int __must_check kobject_move(struct kobject *, struct kobject *);
extern int __must_check kobject_register(struct kobject *);
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -17,9 +17,6 @@
struct kobject;
struct module;
-struct nameidata;
-struct dentry;
-struct sysfs_dirent;
/* FIXME
* The *owner field is no longer used, but leave around
@@ -94,14 +91,13 @@ extern int sysfs_schedule_callback(struc
void (*func)(void *), void *data, struct module *owner);
extern int __must_check
-sysfs_create_dir(struct kobject *kobj, struct sysfs_dirent *shadow_parent_sd);
+sysfs_create_dir(struct kobject *);
extern void
sysfs_remove_dir(struct kobject *);
extern int __must_check
-sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
- const char *new_name);
+sysfs_rename_dir(struct kobject *kobj, const char *new_name);
extern int __must_check
sysfs_move_dir(struct kobject *, struct kobject *);
@@ -138,12 +134,6 @@ void sysfs_remove_file_from_group(struct
void sysfs_notify(struct kobject * k, char *dir, char *attr);
-
-extern int sysfs_make_shadowed_dir(struct kobject *kobj,
- void * (*follow_link)(struct dentry *, struct nameidata *));
-extern struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj);
-extern void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd);
-
extern int __must_check sysfs_init(void);
#else /* CONFIG_SYSFS */
@@ -154,8 +144,7 @@ static inline int sysfs_schedule_callbac
return -ENOSYS;
}
-static inline int sysfs_create_dir(struct kobject *kobj,
- struct sysfs_dirent *shadow_parent_sd)
+static inline int sysfs_create_dir(struct kobject * kobj)
{
return 0;
}
@@ -165,9 +154,7 @@ static inline void sysfs_remove_dir(stru
;
}
-static inline int sysfs_rename_dir(struct kobject *kobj,
- struct sysfs_dirent *new_parent_sd,
- const char *new_name)
+static inline int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
{
return 0;
}
@@ -242,12 +229,6 @@ static inline void sysfs_notify(struct k
{
}
-static inline int sysfs_make_shadowed_dir(struct kobject *kobj,
- void * (*follow_link)(struct dentry *, struct nameidata *))
-{
- return 0;
-}
-
static inline int __must_check sysfs_init(void)
{
return 0;
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -46,11 +46,11 @@ static int populate_dir(struct kobject *
return error;
}
-static int create_dir(struct kobject *kobj, struct sysfs_dirent *shadow_parent)
+static int create_dir(struct kobject * kobj)
{
int error = 0;
if (kobject_name(kobj)) {
- error = sysfs_create_dir(kobj, shadow_parent);
+ error = sysfs_create_dir(kobj);
if (!error) {
if ((error = populate_dir(kobj)))
sysfs_remove_dir(kobj);
@@ -201,12 +201,11 @@ static void unlink(struct kobject * kobj
}
/**
- * kobject_shadow_add - add an object to the hierarchy.
+ * kobject_add - add an object to the hierarchy.
* @kobj: object.
- * @shadow_parent: sysfs directory to add to.
*/
-int kobject_shadow_add(struct kobject *kobj, struct sysfs_dirent *shadow_parent)
+int kobject_add(struct kobject * kobj)
{
int error = 0;
struct kobject * parent;
@@ -238,7 +237,7 @@ int kobject_shadow_add(struct kobject *k
kobj->parent = parent;
}
- error = create_dir(kobj, shadow_parent);
+ error = create_dir(kobj);
if (error) {
/* unlink does the kobject_put() for us */
unlink(kobj);
@@ -260,16 +259,6 @@ int kobject_shadow_add(struct kobject *k
}
/**
- * kobject_add - add an object to the hierarchy.
- * @kobj: object.
- */
-int kobject_add(struct kobject * kobj)
-{
- return kobject_shadow_add(kobj, NULL);
-}
-
-
-/**
* kobject_register - initialize and add an object.
* @kobj: object in question.
*/
@@ -382,7 +371,7 @@ int kobject_rename(struct kobject * kobj
/* Note : if we want to send the new name alone, not the full path,
* we could probably use kobject_name(kobj); */
- error = sysfs_rename_dir(kobj, kobj->parent->sd, new_name);
+ error = sysfs_rename_dir(kobj, new_name);
/* This function is mostly/only used for network interface.
* Some hotplug package track interfaces by their name and
@@ -399,27 +388,6 @@ out:
}
/**
- * kobject_rename - change the name of an object
- * @kobj: object in question.
- * @new_parent: object's new parent
- * @new_name: object's new name
- */
-
-int kobject_shadow_rename(struct kobject *kobj,
- struct sysfs_dirent *new_parent, const char *new_name)
-{
- int error = 0;
-
- kobj = kobject_get(kobj);
- if (!kobj)
- return -EINVAL;
- error = sysfs_rename_dir(kobj, new_parent, new_name);
- kobject_put(kobj);
-
- return error;
-}
-
-/**
* kobject_move - move object to another parent
* @kobj: object in question.
* @new_parent: object's new parent (can be NULL)
Patches currently in gregkh-2.6 which might be from greg at kroah.com are
bad/pci-domain/pci-device-ensure-sysdata-initialised.patch
bad/pci-domain/pci-fix-the-x86-pci-domain-support-fix.patch
bad/relayfs/sysfs-update-relay-file-support-for-generic-relay-api.patch
bad/relayfs/relay-consolidate-relayfs-core-into-kernel-relay.c.patch
bad/relayfs/relay-relay-header-cleanup.patch
bad/relayfs/relayfs-remove-relayfs-in-favour-of-config_relay.patch
bad/relayfs/sysfs-add-__attr_relay-helper-for-relay-attributes.patch
bad/relayfs/sysfs-relay-channel-buffers-as-sysfs-attributes.patch
bad/usbip/usb-usbip-more-dead-code-fix.patch
bad/usbip/usb-usbip-build-fix.patch
bad/usbip/usb-usbip-warning-fixes.patch
bad/ndevfs.patch
bad/battery-class-driver.patch
bad/driver-model-convert-driver-model-to-mutexes.patch
bad/gpl_future-test.patch
bad/gregkh-debugfs_example.patch
bad/speakup-kconfig-fix.patch
bad/speakup-build-fix.patch
bad/pci-use-new-multi-phase-suspend-infrastructure.patch
bad/shot-accross-the-bow.patch
bad/no-more-non-gpl-modules.patch
bad/spi-device.patch
bad/ata_piix-multithread.patch
bad/uio-irq.patch
bad/pci-two-drivers-on-one-pci-device.patch
bad/pci-dynamic-id-cleanup.patch
bad/input-device.patch
bad/usb-stimulus.patch
driver/nozomi.patch
driver/kobject-put-kobject_actions-in-kobject.h.patch
driver/sysfs-implement-sysfs-manged-shadow-directory-support.patch
driver/sysfs-implement-sysfs_delete_link-and-sysfs_rename_link.patch
driver/sysfs-remove-first-pass-at-shadow-directory-support.patch
driver/driver-core-implement-shadow-directory-support-for-device-classes.patch
gregkh/gkh-version.patch
gregkh/sysfs-test.patch
gregkh/sysrq-u-laptop.patch
pci/pci_bridge-device.patch
pci/pci-piggy-bus.patch
pci/pci-move-prototypes-for-pci_bus_find_capability-to-include-linux-pci.h.patch
pci/pci-document-pci_iomap.patch
usb/usb-gotemp.patch
usb/kobject-put-kobject_actions-in-kobject.h.patch
usb/usb-add-the-concept-of-default-authorization-to-usb-hosts.patch
usb/usb-cleanup-usb_register_bus-and-hook-up-sysfs-group.patch
usb/usb-initialize-authorization-and-wusb-bits-in-usb-devices.patch
usb/usb-introduce-usb_device-authorization-bits.patch
usb/usb-usb_set_configuration-obeys-authorization.patch
usb/usb-usb.h-kernel-doc-additions.patch
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