Linux-2.6.12-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!
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);
+