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 000000000000..fe198210bc2d
--- /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);
+