Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 475 insertions, 0 deletions

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
new file mode 100644
index 0000000..fe19821
--- /dev/null
+++ b/fs/sysfs/dir.c
@@ -0,0 +1,475 @@
+/*
+ * dir.c - Operations for sysfs directories.
+ */
+
+#undef DEBUG
+
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/module.h>
+#include <linux/kobject.h>
+#include "sysfs.h"
+
+DECLARE_RWSEM(sysfs_rename_sem);
+
+static void sysfs_d_iput(struct dentry * dentry, struct inode * inode)
+{
+	struct sysfs_dirent * sd = dentry->d_fsdata;
+
+	if (sd) {
+		BUG_ON(sd->s_dentry != dentry);
+		sd->s_dentry = NULL;
+		sysfs_put(sd);
+	}
+	iput(inode);
+}
+
+static struct dentry_operations sysfs_dentry_ops = {
+	.d_iput		= sysfs_d_iput,
+};
+
+/*
+ * 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)
+{
+	struct sysfs_dirent * sd;
+
+	sd = kmem_cache_alloc(sysfs_dir_cachep, GFP_KERNEL);
+	if (!sd)
+		return NULL;
+
+	memset(sd, 0, sizeof(*sd));
+	atomic_set(&sd->s_count, 1);
+	INIT_LIST_HEAD(&sd->s_children);
+	list_add(&sd->s_sibling, &parent_sd->s_children);
+	sd->s_element = element;
+
+	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_new_dirent(parent_sd, element);
+	if (!sd)
+		return -ENOMEM;
+
+	sd->s_mode = mode;
+	sd->s_type = type;
+	sd->s_dentry = dentry;
+	if (dentry) {
+		dentry->d_fsdata = sysfs_get(sd);
+		dentry->d_op = &sysfs_dentry_ops;
+	}
+
+	return 0;
+}
+
+static int init_dir(struct inode * inode)
+{
+	inode->i_op = &sysfs_dir_inode_operations;
+	inode->i_fop = &sysfs_dir_operations;
+
+	/* directory inodes start off with i_nlink == 2 (for "." entry) */
+	inode->i_nlink++;
+	return 0;
+}
+
+static int init_file(struct inode * inode)
+{
+	inode->i_size = PAGE_SIZE;
+	inode->i_fop = &sysfs_file_operations;
+	return 0;
+}
+
+static int init_symlink(struct inode * inode)
+{
+	inode->i_op = &sysfs_symlink_inode_operations;
+	return 0;
+}
+
+static int create_dir(struct kobject * k, struct dentry * p,
+		      const char * n, struct dentry ** d)
+{
+	int error;
+	umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
+
+	down(&p->d_inode->i_sem);
+	*d = sysfs_get_dentry(p,n);
+	if (!IS_ERR(*d)) {
+		error = sysfs_create(*d, mode, init_dir);
+		if (!error) {
+			error = sysfs_make_dirent(p->d_fsdata, *d, k, mode,
+						SYSFS_DIR);
+			if (!error) {
+				p->d_inode->i_nlink++;
+				(*d)->d_op = &sysfs_dentry_ops;
+				d_rehash(*d);
+			}
+		}
+		if (error && (error != -EEXIST))
+			d_drop(*d);
+		dput(*d);
+	} else
+		error = PTR_ERR(*d);
+	up(&p->d_inode->i_sem);
+	return error;
+}
+
+
+int sysfs_create_subdir(struct kobject * k, const char * n, struct dentry ** d)
+{
+	return create_dir(k,k->dentry,n,d);
+}
+
+/**
+ *	sysfs_create_dir - create a directory for an object.
+ *	@parent:	parent parent object.
+ *	@kobj:		object we're creating directory for. 
+ */
+
+int sysfs_create_dir(struct kobject * kobj)
+{
+	struct dentry * dentry = NULL;
+	struct dentry * parent;
+	int error = 0;
+
+	BUG_ON(!kobj);
+
+	if (kobj->parent)
+		parent = kobj->parent->dentry;
+	else if (sysfs_mount && sysfs_mount->mnt_sb)
+		parent = sysfs_mount->mnt_sb->s_root;
+	else
+		return -EFAULT;
+
+	error = create_dir(kobj,parent,kobject_name(kobj),&dentry);
+	if (!error)
+		kobj->dentry = dentry;
+	return error;
+}
+
+/* attaches attribute's sysfs_dirent to the dentry corresponding to the
+ * attribute file
+ */
+static int sysfs_attach_attr(struct sysfs_dirent * sd, struct dentry * dentry)
+{
+	struct attribute * attr = NULL;
+	struct bin_attribute * bin_attr = NULL;
+	int (* init) (struct inode *) = NULL;
+	int error = 0;
+
+        if (sd->s_type & SYSFS_KOBJ_BIN_ATTR) {
+                bin_attr = sd->s_element;
+                attr = &bin_attr->attr;
+        } else {
+                attr = sd->s_element;
+                init = init_file;
+        }
+
+	error = sysfs_create(dentry, (attr->mode & S_IALLUGO) | S_IFREG, init);
+	if (error)
+		return error;
+
+        if (bin_attr) {
+		dentry->d_inode->i_size = bin_attr->size;
+		dentry->d_inode->i_fop = &bin_fops;
+	}
+	dentry->d_op = &sysfs_dentry_ops;
+	dentry->d_fsdata = sysfs_get(sd);
+	sd->s_dentry = dentry;
+	d_rehash(dentry);
+
+	return 0;
+}
+
+static int sysfs_attach_link(struct sysfs_dirent * sd, struct dentry * dentry)
+{
+	int err = 0;
+
+	err = sysfs_create(dentry, S_IFLNK|S_IRWXUGO, init_symlink);
+	if (!err) {
+		dentry->d_op = &sysfs_dentry_ops;
+		dentry->d_fsdata = sysfs_get(sd);
+		sd->s_dentry = dentry;
+		d_rehash(dentry);
+	}
+	return err;
+}
+
+static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
+				struct nameidata *nd)
+{
+	struct sysfs_dirent * parent_sd = dentry->d_parent->d_fsdata;
+	struct sysfs_dirent * sd;
+	int err = 0;
+
+	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
+		if (sd->s_type & SYSFS_NOT_PINNED) {
+			const unsigned char * name = sysfs_get_name(sd);
+
+			if (strcmp(name, dentry->d_name.name))
+				continue;
+
+			if (sd->s_type & SYSFS_KOBJ_LINK)
+				err = sysfs_attach_link(sd, dentry);
+			else
+				err = sysfs_attach_attr(sd, dentry);
+			break;
+		}
+	}
+
+	return ERR_PTR(err);
+}
+
+struct inode_operations sysfs_dir_inode_operations = {
+	.lookup		= sysfs_lookup,
+};
+
+static void remove_dir(struct dentry * d)
+{
+	struct dentry * parent = dget(d->d_parent);
+	struct sysfs_dirent * sd;
+
+	down(&parent->d_inode->i_sem);
+	d_delete(d);
+	sd = d->d_fsdata;
+ 	list_del_init(&sd->s_sibling);
+	sysfs_put(sd);
+	if (d->d_inode)
+		simple_rmdir(parent->d_inode,d);
+
+	pr_debug(" o %s removing done (%d)\n",d->d_name.name,
+		 atomic_read(&d->d_count));
+
+	up(&parent->d_inode->i_sem);
+	dput(parent);
+}
+
+void sysfs_remove_subdir(struct dentry * d)
+{
+	remove_dir(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)
+{
+	struct dentry * dentry = dget(kobj->dentry);
+	struct sysfs_dirent * parent_sd;
+	struct sysfs_dirent * sd, * tmp;
+
+	if (!dentry)
+		return;
+
+	pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
+	down(&dentry->d_inode->i_sem);
+	parent_sd = dentry->d_fsdata;
+	list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) {
+		if (!sd->s_element || !(sd->s_type & SYSFS_NOT_PINNED))
+			continue;
+		list_del_init(&sd->s_sibling);
+		sysfs_drop_dentry(sd, dentry);
+		sysfs_put(sd);
+	}
+	up(&dentry->d_inode->i_sem);
+
+	remove_dir(dentry);
+	/**
+	 * Drop reference from dget() on entrance.
+	 */
+	dput(dentry);
+}
+
+int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
+{
+	int error = 0;
+	struct dentry * new_dentry, * parent;
+
+	if (!strcmp(kobject_name(kobj), new_name))
+		return -EINVAL;
+
+	if (!kobj->parent)
+		return -EINVAL;
+
+	down_write(&sysfs_rename_sem);
+	parent = kobj->parent->dentry;
+
+	down(&parent->d_inode->i_sem);
+
+	new_dentry = sysfs_get_dentry(parent, new_name);
+	if (!IS_ERR(new_dentry)) {
+  		if (!new_dentry->d_inode) {
+			error = kobject_set_name(kobj, "%s", new_name);
+			if (!error) {
+				d_add(new_dentry, NULL);
+				d_move(kobj->dentry, new_dentry);
+			}
+			else
+				d_drop(new_dentry);
+		} else
+			error = -EEXIST;
+		dput(new_dentry);
+	}
+	up(&parent->d_inode->i_sem);	
+	up_write(&sysfs_rename_sem);
+
+	return error;
+}
+
+static int sysfs_dir_open(struct inode *inode, struct file *file)
+{
+	struct dentry * dentry = file->f_dentry;
+	struct sysfs_dirent * parent_sd = dentry->d_fsdata;
+
+	down(&dentry->d_inode->i_sem);
+	file->private_data = sysfs_new_dirent(parent_sd, NULL);
+	up(&dentry->d_inode->i_sem);
+
+	return file->private_data ? 0 : -ENOMEM;
+
+}
+
+static int sysfs_dir_close(struct inode *inode, struct file *file)
+{
+	struct dentry * dentry = file->f_dentry;
+	struct sysfs_dirent * cursor = file->private_data;
+
+	down(&dentry->d_inode->i_sem);
+	list_del_init(&cursor->s_sibling);
+	up(&dentry->d_inode->i_sem);
+
+	release_sysfs_dirent(cursor);
+
+	return 0;
+}
+
+/* Relationship between s_mode and the DT_xxx types */
+static inline unsigned char dt_type(struct sysfs_dirent *sd)
+{
+	return (sd->s_mode >> 12) & 15;
+}
+
+static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+	struct dentry *dentry = filp->f_dentry;
+	struct sysfs_dirent * parent_sd = dentry->d_fsdata;
+	struct sysfs_dirent *cursor = filp->private_data;
+	struct list_head *p, *q = &cursor->s_sibling;
+	ino_t ino;
+	int i = filp->f_pos;
+
+	switch (i) {
+		case 0:
+			ino = dentry->d_inode->i_ino;
+			if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
+				break;
+			filp->f_pos++;
+			i++;
+			/* fallthrough */
+		case 1:
+			ino = parent_ino(dentry);
+			if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
+				break;
+			filp->f_pos++;
+			i++;
+			/* fallthrough */
+		default:
+			if (filp->f_pos == 2) {
+				list_del(q);
+				list_add(q, &parent_sd->s_children);
+			}
+			for (p=q->next; p!= &parent_sd->s_children; p=p->next) {
+				struct sysfs_dirent *next;
+				const char * name;
+				int len;
+
+				next = list_entry(p, struct sysfs_dirent,
+						   s_sibling);
+				if (!next->s_element)
+					continue;
+
+				name = sysfs_get_name(next);
+				len = strlen(name);
+				if (next->s_dentry)
+					ino = next->s_dentry->d_inode->i_ino;
+				else
+					ino = iunique(sysfs_sb, 2);
+
+				if (filldir(dirent, name, len, filp->f_pos, ino,
+						 dt_type(next)) < 0)
+					return 0;
+
+				list_del(q);
+				list_add(q, p);
+				p = q;
+				filp->f_pos++;
+			}
+	}
+	return 0;
+}
+
+static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
+{
+	struct dentry * dentry = file->f_dentry;
+
+	down(&dentry->d_inode->i_sem);
+	switch (origin) {
+		case 1:
+			offset += file->f_pos;
+		case 0:
+			if (offset >= 0)
+				break;
+		default:
+			up(&file->f_dentry->d_inode->i_sem);
+			return -EINVAL;
+	}
+	if (offset != file->f_pos) {
+		file->f_pos = offset;
+		if (file->f_pos >= 2) {
+			struct sysfs_dirent *sd = dentry->d_fsdata;
+			struct sysfs_dirent *cursor = file->private_data;
+			struct list_head *p;
+			loff_t n = file->f_pos - 2;
+
+			list_del(&cursor->s_sibling);
+			p = sd->s_children.next;
+			while (n && p != &sd->s_children) {
+				struct sysfs_dirent *next;
+				next = list_entry(p, struct sysfs_dirent,
+						   s_sibling);
+				if (next->s_element)
+					n--;
+				p = p->next;
+			}
+			list_add_tail(&cursor->s_sibling, p);
+		}
+	}
+	up(&dentry->d_inode->i_sem);
+	return offset;
+}
+
+struct file_operations sysfs_dir_operations = {
+	.open		= sysfs_dir_open,
+	.release	= sysfs_dir_close,
+	.llseek		= sysfs_dir_lseek,
+	.read		= generic_read_dir,
+	.readdir	= sysfs_readdir,
+};
+
+EXPORT_SYMBOL_GPL(sysfs_create_dir);
+EXPORT_SYMBOL_GPL(sysfs_remove_dir);
+EXPORT_SYMBOL_GPL(sysfs_rename_dir);
+