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-rw-r--r--fs/sysfs/bin.c6
-rw-r--r--fs/sysfs/dir.c214
-rw-r--r--fs/sysfs/file.c82
-rw-r--r--fs/sysfs/group.c2
-rw-r--r--fs/sysfs/inode.c36
-rw-r--r--fs/sysfs/mount.c11
-rw-r--r--fs/sysfs/symlink.c1
-rw-r--r--fs/sysfs/sysfs.h21
8 files changed, 305 insertions, 68 deletions
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index e8f540d38d48..d3b9f5f07db1 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <asm/uaccess.h>
+#include <asm/semaphore.h>
#include "sysfs.h"
@@ -146,7 +147,7 @@ static int open(struct inode * inode, struct file * file)
Error:
module_put(attr->attr.owner);
Done:
- if (error && kobj)
+ if (error)
kobject_put(kobj);
return error;
}
@@ -157,8 +158,7 @@ static int release(struct inode * inode, struct file * file)
struct bin_attribute * attr = to_bin_attr(file->f_path.dentry);
u8 * buffer = file->private_data;
- if (kobj)
- kobject_put(kobj);
+ kobject_put(kobj);
module_put(attr->attr.owner);
kfree(buffer);
return 0;
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 511edef8b321..9dcdf556c99c 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/namei.h>
+#include <asm/semaphore.h>
#include "sysfs.h"
DECLARE_RWSEM(sysfs_rename_sem);
@@ -32,8 +33,7 @@ static struct dentry_operations sysfs_dentry_ops = {
/*
* Allocates a new sysfs_dirent and links it to the parent sysfs_dirent
*/
-static struct sysfs_dirent * sysfs_new_dirent(struct sysfs_dirent * parent_sd,
- void * element)
+static struct sysfs_dirent * __sysfs_new_dirent(void * element)
{
struct sysfs_dirent * sd;
@@ -45,12 +45,28 @@ static struct sysfs_dirent * sysfs_new_dirent(struct sysfs_dirent * parent_sd,
atomic_set(&sd->s_count, 1);
atomic_set(&sd->s_event, 1);
INIT_LIST_HEAD(&sd->s_children);
- list_add(&sd->s_sibling, &parent_sd->s_children);
+ INIT_LIST_HEAD(&sd->s_sibling);
sd->s_element = element;
return sd;
}
+static void __sysfs_list_dirent(struct sysfs_dirent *parent_sd,
+ struct sysfs_dirent *sd)
+{
+ if (sd)
+ list_add(&sd->s_sibling, &parent_sd->s_children);
+}
+
+static struct sysfs_dirent * sysfs_new_dirent(struct sysfs_dirent *parent_sd,
+ void * element)
+{
+ struct sysfs_dirent *sd;
+ sd = __sysfs_new_dirent(element);
+ __sysfs_list_dirent(parent_sd, sd);
+ return sd;
+}
+
/*
*
* Return -EEXIST if there is already a sysfs element with the same name for
@@ -77,14 +93,14 @@ int sysfs_dirent_exist(struct sysfs_dirent *parent_sd,
}
-int sysfs_make_dirent(struct sysfs_dirent * parent_sd, struct dentry * dentry,
- void * element, umode_t mode, int type)
+static struct sysfs_dirent *
+__sysfs_make_dirent(struct dentry *dentry, void *element, mode_t mode, int type)
{
struct sysfs_dirent * sd;
- sd = sysfs_new_dirent(parent_sd, element);
+ sd = __sysfs_new_dirent(element);
if (!sd)
- return -ENOMEM;
+ goto out;
sd->s_mode = mode;
sd->s_type = type;
@@ -94,7 +110,19 @@ int sysfs_make_dirent(struct sysfs_dirent * parent_sd, struct dentry * dentry,
dentry->d_op = &sysfs_dentry_ops;
}
- return 0;
+out:
+ return sd;
+}
+
+int sysfs_make_dirent(struct sysfs_dirent * parent_sd, struct dentry * dentry,
+ void * element, umode_t mode, int type)
+{
+ struct sysfs_dirent *sd;
+
+ sd = __sysfs_make_dirent(dentry, element, mode, type);
+ __sysfs_list_dirent(parent_sd, sd);
+
+ return sd ? 0 : -ENOMEM;
}
static int init_dir(struct inode * inode)
@@ -165,11 +193,11 @@ int sysfs_create_subdir(struct kobject * k, const char * n, struct dentry ** d)
/**
* sysfs_create_dir - create a directory for an object.
- * @parent: parent parent object.
* @kobj: object we're creating directory for.
+ * @shadow_parent: parent parent object.
*/
-int sysfs_create_dir(struct kobject * kobj)
+int sysfs_create_dir(struct kobject * kobj, struct dentry *shadow_parent)
{
struct dentry * dentry = NULL;
struct dentry * parent;
@@ -177,7 +205,9 @@ int sysfs_create_dir(struct kobject * kobj)
BUG_ON(!kobj);
- if (kobj->parent)
+ if (shadow_parent)
+ parent = shadow_parent;
+ else if (kobj->parent)
parent = kobj->parent->dentry;
else if (sysfs_mount && sysfs_mount->mnt_sb)
parent = sysfs_mount->mnt_sb->s_root;
@@ -298,21 +328,12 @@ void sysfs_remove_subdir(struct dentry * d)
}
-/**
- * sysfs_remove_dir - remove an object's directory.
- * @kobj: object.
- *
- * 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_dir(struct kobject * kobj)
+static void __sysfs_remove_dir(struct dentry *dentry)
{
- struct dentry * dentry = dget(kobj->dentry);
struct sysfs_dirent * parent_sd;
struct sysfs_dirent * sd, * tmp;
+ dget(dentry);
if (!dentry)
return;
@@ -333,32 +354,60 @@ void sysfs_remove_dir(struct kobject * kobj)
* Drop reference from dget() on entrance.
*/
dput(dentry);
+}
+
+/**
+ * sysfs_remove_dir - remove an object's directory.
+ * @kobj: object.
+ *
+ * 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_dir(struct kobject * kobj)
+{
+ __sysfs_remove_dir(kobj->dentry);
kobj->dentry = NULL;
}
-int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
+int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
+ const char *new_name)
{
int error = 0;
- struct dentry * new_dentry, * parent;
-
- if (!strcmp(kobject_name(kobj), new_name))
- return -EINVAL;
+ struct dentry * new_dentry;
- if (!kobj->parent)
- return -EINVAL;
+ if (!new_parent)
+ return -EFAULT;
down_write(&sysfs_rename_sem);
- parent = kobj->parent->dentry;
-
- mutex_lock(&parent->d_inode->i_mutex);
+ mutex_lock(&new_parent->d_inode->i_mutex);
- new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
+ new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name));
if (!IS_ERR(new_dentry)) {
- if (!new_dentry->d_inode) {
+ /* By allowing two different directories with the
+ * same d_parent we allow this routine to move
+ * between different shadows of the same directory
+ */
+ if (kobj->dentry->d_parent->d_inode != new_parent->d_inode)
+ return -EINVAL;
+ else if (new_dentry->d_parent->d_inode != new_parent->d_inode)
+ error = -EINVAL;
+ else if (new_dentry == kobj->dentry)
+ error = -EINVAL;
+ else if (!new_dentry->d_inode) {
error = kobject_set_name(kobj, "%s", new_name);
if (!error) {
+ struct sysfs_dirent *sd, *parent_sd;
+
d_add(new_dentry, NULL);
d_move(kobj->dentry, new_dentry);
+
+ sd = kobj->dentry->d_fsdata;
+ parent_sd = new_parent->d_fsdata;
+
+ list_del_init(&sd->s_sibling);
+ list_add(&sd->s_sibling, &parent_sd->s_children);
}
else
d_drop(new_dentry);
@@ -366,7 +415,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
error = -EEXIST;
dput(new_dentry);
}
- mutex_unlock(&parent->d_inode->i_mutex);
+ mutex_unlock(&new_parent->d_inode->i_mutex);
up_write(&sysfs_rename_sem);
return error;
@@ -378,12 +427,10 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent)
struct sysfs_dirent *new_parent_sd, *sd;
int error;
- if (!new_parent)
- return -EINVAL;
-
old_parent_dentry = kobj->parent ?
kobj->parent->dentry : sysfs_mount->mnt_sb->s_root;
- new_parent_dentry = new_parent->dentry;
+ new_parent_dentry = new_parent ?
+ new_parent->dentry : sysfs_mount->mnt_sb->s_root;
again:
mutex_lock(&old_parent_dentry->d_inode->i_mutex);
@@ -547,6 +594,95 @@ static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
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 inode *inode;
+ struct inode_operations *i_op;
+
+ inode = kobj->dentry->d_inode;
+ if (inode->i_op != &sysfs_dir_inode_operations)
+ 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 dentry *sysfs_create_shadow_dir(struct kobject *kobj)
+{
+ struct sysfs_dirent *sd;
+ struct dentry *parent, *dir, *shadow;
+ struct inode *inode;
+
+ dir = kobj->dentry;
+ inode = dir->d_inode;
+ parent = dir->d_parent;
+ shadow = ERR_PTR(-EINVAL);
+ if (!sysfs_is_shadowed_inode(inode))
+ goto out;
+
+ shadow = d_alloc(parent, &dir->d_name);
+ if (!shadow)
+ goto nomem;
+
+ sd = __sysfs_make_dirent(shadow, kobj, inode->i_mode, SYSFS_DIR);
+ if (!sd)
+ goto nomem;
+
+ d_instantiate(shadow, igrab(inode));
+ inc_nlink(inode);
+ inc_nlink(parent->d_inode);
+ shadow->d_op = &sysfs_dentry_ops;
+
+ dget(shadow); /* Extra count - pin the dentry in core */
+
+out:
+ return shadow;
+nomem:
+ dput(shadow);
+ shadow = ERR_PTR(-ENOMEM);
+ goto out;
+}
+
+/**
+ * sysfs_remove_shadow_dir - remove an object's directory.
+ * @shadow: dentry 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 dentry *shadow)
+{
+ __sysfs_remove_dir(shadow);
+}
+
const struct file_operations sysfs_dir_operations = {
.open = sysfs_dir_open,
.release = sysfs_dir_close,
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 9cfe53e1e00d..c0e117649a4d 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -7,6 +7,7 @@
#include <linux/kobject.h>
#include <linux/namei.h>
#include <linux/poll.h>
+#include <linux/list.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
@@ -50,17 +51,29 @@ static struct sysfs_ops subsys_sysfs_ops = {
.store = subsys_attr_store,
};
+/**
+ * add_to_collection - add buffer to a collection
+ * @buffer: buffer to be added
+ * @node inode of set to add to
+ */
-struct sysfs_buffer {
- size_t count;
- loff_t pos;
- char * page;
- struct sysfs_ops * ops;
- struct semaphore sem;
- int needs_read_fill;
- int event;
-};
+static inline void
+add_to_collection(struct sysfs_buffer *buffer, struct inode *node)
+{
+ struct sysfs_buffer_collection *set = node->i_private;
+ mutex_lock(&node->i_mutex);
+ list_add(&buffer->associates, &set->associates);
+ mutex_unlock(&node->i_mutex);
+}
+
+static inline void
+remove_from_collection(struct sysfs_buffer *buffer, struct inode *node)
+{
+ mutex_lock(&node->i_mutex);
+ list_del(&buffer->associates);
+ mutex_unlock(&node->i_mutex);
+}
/**
* fill_read_buffer - allocate and fill buffer from object.
@@ -70,7 +83,8 @@ struct sysfs_buffer {
* Allocate @buffer->page, if it hasn't been already, then call the
* kobject's show() method to fill the buffer with this attribute's
* data.
- * This is called only once, on the file's first read.
+ * This is called only once, on the file's first read unless an error
+ * is returned.
*/
static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer)
{
@@ -88,12 +102,13 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer
buffer->event = atomic_read(&sd->s_event);
count = ops->show(kobj,attr,buffer->page);
- buffer->needs_read_fill = 0;
BUG_ON(count > (ssize_t)PAGE_SIZE);
- if (count >= 0)
+ if (count >= 0) {
+ buffer->needs_read_fill = 0;
buffer->count = count;
- else
+ } else {
ret = count;
+ }
return ret;
}
@@ -153,6 +168,10 @@ sysfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos)
ssize_t retval = 0;
down(&buffer->sem);
+ if (buffer->orphaned) {
+ retval = -ENODEV;
+ goto out;
+ }
if (buffer->needs_read_fill) {
if ((retval = fill_read_buffer(file->f_path.dentry,buffer)))
goto out;
@@ -165,7 +184,6 @@ out:
return retval;
}
-
/**
* fill_write_buffer - copy buffer from userspace.
* @buffer: data buffer for file.
@@ -243,19 +261,25 @@ sysfs_write_file(struct file *file, const char __user *buf, size_t count, loff_t
ssize_t len;
down(&buffer->sem);
+ if (buffer->orphaned) {
+ len = -ENODEV;
+ goto out;
+ }
len = fill_write_buffer(buffer, buf, count);
if (len > 0)
len = flush_write_buffer(file->f_path.dentry, buffer, len);
if (len > 0)
*ppos += len;
+out:
up(&buffer->sem);
return len;
}
-static int check_perm(struct inode * inode, struct file * file)
+static int sysfs_open_file(struct inode *inode, struct file *file)
{
struct kobject *kobj = sysfs_get_kobject(file->f_path.dentry->d_parent);
struct attribute * attr = to_attr(file->f_path.dentry);
+ struct sysfs_buffer_collection *set;
struct sysfs_buffer * buffer;
struct sysfs_ops * ops = NULL;
int error = 0;
@@ -285,6 +309,18 @@ static int check_perm(struct inode * inode, struct file * file)
if (!ops)
goto Eaccess;
+ /* make sure we have a collection to add our buffers to */
+ mutex_lock(&inode->i_mutex);
+ if (!(set = inode->i_private)) {
+ if (!(set = inode->i_private = kmalloc(sizeof(struct sysfs_buffer_collection), GFP_KERNEL))) {
+ error = -ENOMEM;
+ goto Done;
+ } else {
+ INIT_LIST_HEAD(&set->associates);
+ }
+ }
+ mutex_unlock(&inode->i_mutex);
+
/* File needs write support.
* The inode's perms must say it's ok,
* and we must have a store method.
@@ -310,9 +346,11 @@ static int check_perm(struct inode * inode, struct file * file)
*/
buffer = kzalloc(sizeof(struct sysfs_buffer), GFP_KERNEL);
if (buffer) {
+ INIT_LIST_HEAD(&buffer->associates);
init_MUTEX(&buffer->sem);
buffer->needs_read_fill = 1;
buffer->ops = ops;
+ add_to_collection(buffer, inode);
file->private_data = buffer;
} else
error = -ENOMEM;
@@ -325,16 +363,11 @@ static int check_perm(struct inode * inode, struct file * file)
error = -EACCES;
module_put(attr->owner);
Done:
- if (error && kobj)
+ if (error)
kobject_put(kobj);
return error;
}
-static int sysfs_open_file(struct inode * inode, struct file * filp)
-{
- return check_perm(inode,filp);
-}
-
static int sysfs_release(struct inode * inode, struct file * filp)
{
struct kobject * kobj = to_kobj(filp->f_path.dentry->d_parent);
@@ -342,8 +375,9 @@ static int sysfs_release(struct inode * inode, struct file * filp)
struct module * owner = attr->owner;
struct sysfs_buffer * buffer = filp->private_data;
- if (kobj)
- kobject_put(kobj);
+ if (buffer)
+ remove_from_collection(buffer, inode);
+ kobject_put(kobj);
/* After this point, attr should not be accessed. */
module_put(owner);
@@ -548,7 +582,7 @@ EXPORT_SYMBOL_GPL(sysfs_chmod_file);
void sysfs_remove_file(struct kobject * kobj, const struct attribute * attr)
{
- sysfs_hash_and_remove(kobj->dentry,attr->name);
+ sysfs_hash_and_remove(kobj->dentry, attr->name);
}
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 122145b0895c..b20951c93761 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -13,6 +13,8 @@
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/err.h>
+#include <linux/fs.h>
+#include <asm/semaphore.h>
#include "sysfs.h"
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index e79e38d52c00..542d2bcc73df 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -13,6 +13,7 @@
#include <linux/backing-dev.h>
#include <linux/capability.h>
#include <linux/errno.h>
+#include <asm/semaphore.h>
#include "sysfs.h"
extern struct super_block * sysfs_sb;
@@ -32,6 +33,16 @@ static struct inode_operations sysfs_inode_operations ={
.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;
@@ -209,6 +220,22 @@ const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
return NULL;
}
+static inline void orphan_all_buffers(struct inode *node)
+{
+ struct sysfs_buffer_collection *set = node->i_private;
+ struct sysfs_buffer *buf;
+
+ mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD);
+ if (node->i_private) {
+ list_for_each_entry(buf, &set->associates, associates) {
+ down(&buf->sem);
+ buf->orphaned = 1;
+ up(&buf->sem);
+ }
+ }
+ mutex_unlock(&node->i_mutex);
+}
+
/*
* Unhashes the dentry corresponding to given sysfs_dirent
@@ -217,16 +244,23 @@ const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent)
{
struct dentry * dentry = sd->s_dentry;
+ struct inode *inode;
if (dentry) {
spin_lock(&dcache_lock);
spin_lock(&dentry->d_lock);
if (!(d_unhashed(dentry) && dentry->d_inode)) {
+ inode = dentry->d_inode;
+ spin_lock(&inode->i_lock);
+ __iget(inode);
+ spin_unlock(&inode->i_lock);
dget_locked(dentry);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
spin_unlock(&dcache_lock);
simple_unlink(parent->d_inode, dentry);
+ orphan_all_buffers(inode);
+ iput(inode);
} else {
spin_unlock(&dentry->d_lock);
spin_unlock(&dcache_lock);
@@ -248,7 +282,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name)
return -ENOENT;
parent_sd = dir->d_fsdata;
- mutex_lock(&dir->d_inode->i_mutex);
+ mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
if (!sd->s_element)
continue;
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index e503f858fba8..f6a87a824883 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -8,6 +8,7 @@
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
+#include <asm/semaphore.h>
#include "sysfs.h"
@@ -18,9 +19,12 @@ struct vfsmount *sysfs_mount;
struct super_block * sysfs_sb = NULL;
struct kmem_cache *sysfs_dir_cachep;
+static void sysfs_clear_inode(struct inode *inode);
+
static struct super_operations sysfs_ops = {
.statfs = simple_statfs,
- .drop_inode = generic_delete_inode,
+ .drop_inode = sysfs_delete_inode,
+ .clear_inode = sysfs_clear_inode,
};
static struct sysfs_dirent sysfs_root = {
@@ -31,6 +35,11 @@ static struct sysfs_dirent sysfs_root = {
.s_iattr = NULL,
};
+static void sysfs_clear_inode(struct inode *inode)
+{
+ kfree(inode->i_private);
+}
+
static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
{
struct inode *inode;
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index f50e3cc2ded8..4869f611192f 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -7,6 +7,7 @@
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/namei.h>
+#include <asm/semaphore.h>
#include "sysfs.h"
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index bd7cec295dab..fe1cbfd208ed 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -2,6 +2,7 @@
extern struct vfsmount * sysfs_mount;
extern struct kmem_cache *sysfs_dir_cachep;
+extern void sysfs_delete_inode(struct inode *inode);
extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
@@ -33,6 +34,22 @@ struct sysfs_symlink {
struct kobject * target_kobj;
};
+struct sysfs_buffer {
+ struct list_head associates;
+ size_t count;
+ loff_t pos;
+ char * page;
+ struct sysfs_ops * ops;
+ struct semaphore sem;
+ int orphaned;
+ int needs_read_fill;
+ int event;
+};
+
+struct sysfs_buffer_collection {
+ struct list_head associates;
+};
+
static inline struct kobject * to_kobj(struct dentry * dentry)
{
struct sysfs_dirent * sd = dentry->d_fsdata;
@@ -96,3 +113,7 @@ static inline void sysfs_put(struct sysfs_dirent * sd)
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;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.