fs: ubifs: replace CURRENT_TIME_SEC with current_time

[karo-tx-linux.git] / fs / readdir.c

diff --git a/fs/readdir.c b/fs/readdir.c
index 0e8a7f355f7a1916218a9bd4d874e3ed771c6fc1..89659549c09d81b42d26aef337f62c93ca4c1379 100644 (file)
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -18,6 +18,7 @@
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/unistd.h>
+#include <linux/compat.h>
 
 #include <linux/uaccess.h>
 
@@ -324,3 +325,167 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
        fdput_pos(f);
        return error;
 }
+
+#ifdef CONFIG_COMPAT
+struct compat_old_linux_dirent {
+       compat_ulong_t  d_ino;
+       compat_ulong_t  d_offset;
+       unsigned short  d_namlen;
+       char            d_name[1];
+};
+
+struct compat_readdir_callback {
+       struct dir_context ctx;
+       struct compat_old_linux_dirent __user *dirent;
+       int result;
+};
+
+static int compat_fillonedir(struct dir_context *ctx, const char *name,
+                            int namlen, loff_t offset, u64 ino,
+                            unsigned int d_type)
+{
+       struct compat_readdir_callback *buf =
+               container_of(ctx, struct compat_readdir_callback, ctx);
+       struct compat_old_linux_dirent __user *dirent;
+       compat_ulong_t d_ino;
+
+       if (buf->result)
+               return -EINVAL;
+       d_ino = ino;
+       if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
+               buf->result = -EOVERFLOW;
+               return -EOVERFLOW;
+       }
+       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(d_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;
+}
+
+COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
+               struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
+{
+       int error;
+       struct fd f = fdget_pos(fd);
+       struct compat_readdir_callback buf = {
+               .ctx.actor = compat_fillonedir,
+               .dirent = dirent
+       };
+
+       if (!f.file)
+               return -EBADF;
+
+       error = iterate_dir(f.file, &buf.ctx);
+       if (buf.result)
+               error = buf.result;
+
+       fdput_pos(f);
+       return error;
+}
+
+struct compat_linux_dirent {
+       compat_ulong_t  d_ino;
+       compat_ulong_t  d_off;
+       unsigned short  d_reclen;
+       char            d_name[1];
+};
+
+struct compat_getdents_callback {
+       struct dir_context ctx;
+       struct compat_linux_dirent __user *current_dir;
+       struct compat_linux_dirent __user *previous;
+       int count;
+       int error;
+};
+
+static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
+               loff_t offset, u64 ino, unsigned int d_type)
+{
+       struct compat_linux_dirent __user * dirent;
+       struct compat_getdents_callback *buf =
+               container_of(ctx, struct compat_getdents_callback, ctx);
+       compat_ulong_t d_ino;
+       int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
+               namlen + 2, sizeof(compat_long_t));
+
+       buf->error = -EINVAL;   /* only used if we fail.. */
+       if (reclen > buf->count)
+               return -EINVAL;
+       d_ino = ino;
+       if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
+               buf->error = -EOVERFLOW;
+               return -EOVERFLOW;
+       }
+       dirent = buf->previous;
+       if (dirent) {
+               if (signal_pending(current))
+                       return -EINTR;
+               if (__put_user(offset, &dirent->d_off))
+                       goto efault;
+       }
+       dirent = buf->current_dir;
+       if (__put_user(d_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;
+}
+
+COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
+               struct compat_linux_dirent __user *, dirent, unsigned int, count)
+{
+       struct fd f;
+       struct compat_linux_dirent __user * lastdirent;
+       struct compat_getdents_callback buf = {
+               .ctx.actor = compat_filldir,
+               .current_dir = dirent,
+               .count = count
+       };
+       int error;
+
+       if (!access_ok(VERIFY_WRITE, dirent, count))
+               return -EFAULT;
+
+       f = fdget_pos(fd);
+       if (!f.file)
+               return -EBADF;
+
+       error = iterate_dir(f.file, &buf.ctx);
+       if (error >= 0)
+               error = buf.error;
+       lastdirent = buf.previous;
+       if (lastdirent) {
+               if (put_user(buf.ctx.pos, &lastdirent->d_off))
+                       error = -EFAULT;
+               else
+                       error = count - buf.count;
+       }
+       fdput_pos(f);
+       return error;
+}
+#endif