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, 300 insertions, 0 deletions

diff --git a/fs/readdir.c b/fs/readdir.c
new file mode 100644
index 000000000000..b03579bc0210
--- /dev/null
+++ b/fs/readdir.c
@@ -0,0 +1,300 @@
+/*
+ *  linux/fs/readdir.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ */
+
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/stat.h>
+#include <linux/file.h>
+#include <linux/smp_lock.h>
+#include <linux/fs.h>
+#include <linux/dirent.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <linux/unistd.h>
+
+#include <asm/uaccess.h>
+
+int vfs_readdir(struct file *file, filldir_t filler, void *buf)
+{
+        struct inode *inode = file->f_dentry->d_inode;
+        int res = -ENOTDIR;
+        if (!file->f_op || !file->f_op->readdir)
+                goto out;
+
+        res = security_file_permission(file, MAY_READ);
+        if (res)
+                goto out;
+
+        down(&inode->i_sem);
+        res = -ENOENT;
+        if (!IS_DEADDIR(inode)) {
+                res = file->f_op->readdir(file, buf, filler);
+                file_accessed(file);
+        }
+        up(&inode->i_sem);
+out:
+        return res;
+}
+
+EXPORT_SYMBOL(vfs_readdir);
+
+/*
+ * Traditional linux readdir() handling..
+ *
+ * "count=1" is a special case, meaning that the buffer is one
+ * dirent-structure in size and that the code can't handle more
+ * anyway. Thus the special "fillonedir()" function for that
+ * case (the low-level handlers don't need to care about this).
+ */
+#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
+#define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))
+
+#ifdef __ARCH_WANT_OLD_READDIR
+
+struct old_linux_dirent {
+        unsigned long   d_ino;
+        unsigned long   d_offset;
+        unsigned short  d_namlen;
+        char            d_name[1];
+};
+
+struct readdir_callback {
+        struct old_linux_dirent __user * dirent;
+        int result;
+};
+
+static int fillonedir(void * __buf, const char * name, int namlen, loff_t offset,
+                      ino_t ino, unsigned int d_type)
+{
+        struct readdir_callback * buf = (struct readdir_callback *) __buf;
+        struct old_linux_dirent __user * dirent;
+
+        if (buf->result)
+                return -EINVAL;
+        buf->result++;
+        dirent = buf->dirent;
+        if (!access_ok(VERIFY_WRITE, dirent,
+                        (unsigned long)(dirent->d_name + namlen + 1) -
+                                (unsigned long)dirent))
+                goto efault;
+        if (    __put_user(ino, &dirent->d_ino) ||
+                __put_user(offset, &dirent->d_offset) ||
+                __put_user(namlen, &dirent->d_namlen) ||
+                __copy_to_user(dirent->d_name, name, namlen) ||
+                __put_user(0, dirent->d_name + namlen))
+                goto efault;
+        return 0;
+efault:
+        buf->result = -EFAULT;
+        return -EFAULT;
+}
+
+asmlinkage long old_readdir(unsigned int fd, struct old_linux_dirent __user * dirent, unsigned int count)
+{
+        int error;
+        struct file * file;
+        struct readdir_callback buf;
+
+        error = -EBADF;
+        file = fget(fd);
+        if (!file)
+                goto out;
+
+        buf.result = 0;
+        buf.dirent = dirent;
+
+        error = vfs_readdir(file, fillonedir, &buf);
+        if (error >= 0)
+                error = buf.result;
+
+        fput(file);
+out:
+        return error;
+}
+
+#endif /* __ARCH_WANT_OLD_READDIR */
+
+/*
+ * New, all-improved, singing, dancing, iBCS2-compliant getdents()
+ * interface. 
+ */
+struct linux_dirent {
+        unsigned long   d_ino;
+        unsigned long   d_off;
+        unsigned short  d_reclen;
+        char            d_name[1];
+};
+
+struct getdents_callback {
+        struct linux_dirent __user * current_dir;
+        struct linux_dirent __user * previous;
+        int count;
+        int error;
+};
+
+static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
+                   ino_t ino, unsigned int d_type)
+{
+        struct linux_dirent __user * dirent;
+        struct getdents_callback * buf = (struct getdents_callback *) __buf;
+        int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
+
+        buf->error = -EINVAL;   /* only used if we fail.. */
+        if (reclen > buf->count)
+                return -EINVAL;
+        dirent = buf->previous;
+        if (dirent) {
+                if (__put_user(offset, &dirent->d_off))
+                        goto efault;
+        }
+        dirent = buf->current_dir;
+        if (__put_user(ino, &dirent->d_ino))
+                goto efault;
+        if (__put_user(reclen, &dirent->d_reclen))
+                goto efault;
+        if (copy_to_user(dirent->d_name, name, namlen))
+                goto efault;
+        if (__put_user(0, dirent->d_name + namlen))
+                goto efault;
+        if (__put_user(d_type, (char __user *) dirent + reclen - 1))
+                goto efault;
+        buf->previous = dirent;
+        dirent = (void __user *)dirent + reclen;
+        buf->current_dir = dirent;
+        buf->count -= reclen;
+        return 0;
+efault:
+        buf->error = -EFAULT;
+        return -EFAULT;
+}
+
+asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * dirent, unsigned int count)
+{
+        struct file * file;
+        struct linux_dirent __user * lastdirent;
+        struct getdents_callback buf;
+        int error;
+
+        error = -EFAULT;
+        if (!access_ok(VERIFY_WRITE, dirent, count))
+                goto out;
+
+        error = -EBADF;
+        file = fget(fd);
+        if (!file)
+                goto out;
+
+        buf.current_dir = dirent;
+        buf.previous = NULL;
+        buf.count = count;
+        buf.error = 0;
+
+        error = vfs_readdir(file, filldir, &buf);
+        if (error < 0)
+                goto out_putf;
+        error = buf.error;
+        lastdirent = buf.previous;
+        if (lastdirent) {
+                if (put_user(file->f_pos, &lastdirent->d_off))
+                        error = -EFAULT;
+                else
+                        error = count - buf.count;
+        }
+
+out_putf:
+        fput(file);
+out:
+        return error;
+}
+
+#define ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
+
+struct getdents_callback64 {
+        struct linux_dirent64 __user * current_dir;
+        struct linux_dirent64 __user * previous;
+        int count;
+        int error;
+};
+
+static int filldir64(void * __buf, const char * name, int namlen, loff_t offset,
+                     ino_t ino, unsigned int d_type)
+{
+        struct linux_dirent64 __user *dirent;
+        struct getdents_callback64 * buf = (struct getdents_callback64 *) __buf;
+        int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namlen + 1);
+
+        buf->error = -EINVAL;   /* only used if we fail.. */
+        if (reclen > buf->count)
+                return -EINVAL;
+        dirent = buf->previous;
+        if (dirent) {
+                if (__put_user(offset, &dirent->d_off))
+                        goto efault;
+        }
+        dirent = buf->current_dir;
+        if (__put_user(ino, &dirent->d_ino))
+                goto efault;
+        if (__put_user(0, &dirent->d_off))
+                goto efault;
+        if (__put_user(reclen, &dirent->d_reclen))
+                goto efault;
+        if (__put_user(d_type, &dirent->d_type))
+                goto efault;
+        if (copy_to_user(dirent->d_name, name, namlen))
+                goto efault;
+        if (__put_user(0, dirent->d_name + namlen))
+                goto efault;
+        buf->previous = dirent;
+        dirent = (void __user *)dirent + reclen;
+        buf->current_dir = dirent;
+        buf->count -= reclen;
+        return 0;
+efault:
+        buf->error = -EFAULT;
+        return -EFAULT;
+}
+
+asmlinkage long sys_getdents64(unsigned int fd, struct linux_dirent64 __user * dirent, unsigned int count)
+{
+        struct file * file;
+        struct linux_dirent64 __user * lastdirent;
+        struct getdents_callback64 buf;
+        int error;
+
+        error = -EFAULT;
+        if (!access_ok(VERIFY_WRITE, dirent, count))
+                goto out;
+
+        error = -EBADF;
+        file = fget(fd);
+        if (!file)
+                goto out;
+
+        buf.current_dir = dirent;
+        buf.previous = NULL;
+        buf.count = count;
+        buf.error = 0;
+
+        error = vfs_readdir(file, filldir64, &buf);
+        if (error < 0)
+                goto out_putf;
+        error = buf.error;
+        lastdirent = buf.previous;
+        if (lastdirent) {
+                typeof(lastdirent->d_off) d_off = file->f_pos;
+                error = -EFAULT;
+                if (__put_user(d_off, &lastdirent->d_off))
+                        goto out_putf;
+                error = count - buf.count;
+        }
+
+out_putf:
+        fput(file);
+out:
+        return error;
+}