Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

[pandora-kernel.git] / fs / pipe.c

diff --git a/fs/pipe.c b/fs/pipe.c
index 700f4e0..fcba654 100644 (file)
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -777,45 +777,10 @@ pipe_rdwr_open(struct inode *inode, struct file *filp)
 /*
  * The file_operations structs are not static because they
  * are also used in linux/fs/fifo.c to do operations on FIFOs.
+ *
+ * Pipes reuse fifos' file_operations structs.
  */
-const struct file_operations read_fifo_fops = {
-       .llseek         = no_llseek,
-       .read           = do_sync_read,
-       .aio_read       = pipe_read,
-       .write          = bad_pipe_w,
-       .poll           = pipe_poll,
-       .unlocked_ioctl = pipe_ioctl,
-       .open           = pipe_read_open,
-       .release        = pipe_read_release,
-       .fasync         = pipe_read_fasync,
-};
-
-const struct file_operations write_fifo_fops = {
-       .llseek         = no_llseek,
-       .read           = bad_pipe_r,
-       .write          = do_sync_write,
-       .aio_write      = pipe_write,
-       .poll           = pipe_poll,
-       .unlocked_ioctl = pipe_ioctl,
-       .open           = pipe_write_open,
-       .release        = pipe_write_release,
-       .fasync         = pipe_write_fasync,
-};
-
-const struct file_operations rdwr_fifo_fops = {
-       .llseek         = no_llseek,
-       .read           = do_sync_read,
-       .aio_read       = pipe_read,
-       .write          = do_sync_write,
-       .aio_write      = pipe_write,
-       .poll           = pipe_poll,
-       .unlocked_ioctl = pipe_ioctl,
-       .open           = pipe_rdwr_open,
-       .release        = pipe_rdwr_release,
-       .fasync         = pipe_rdwr_fasync,
-};
-
-static const struct file_operations read_pipe_fops = {
+const struct file_operations read_pipefifo_fops = {
        .llseek         = no_llseek,
        .read           = do_sync_read,
        .aio_read       = pipe_read,
@@ -827,7 +792,7 @@ static const struct file_operations read_pipe_fops = {
        .fasync         = pipe_read_fasync,
 };
 
-static const struct file_operations write_pipe_fops = {
+const struct file_operations write_pipefifo_fops = {
        .llseek         = no_llseek,
        .read           = bad_pipe_r,
        .write          = do_sync_write,
@@ -839,7 +804,7 @@ static const struct file_operations write_pipe_fops = {
        .fasync         = pipe_write_fasync,
 };
 
-static const struct file_operations rdwr_pipe_fops = {
+const struct file_operations rdwr_pipefifo_fops = {
        .llseek         = no_llseek,
        .read           = do_sync_read,
        .aio_read       = pipe_read,
@@ -927,7 +892,7 @@ static struct inode * get_pipe_inode(void)
        inode->i_pipe = pipe;
 
        pipe->readers = pipe->writers = 1;
-       inode->i_fop = &rdwr_pipe_fops;
+       inode->i_fop = &rdwr_pipefifo_fops;
 
        /*
         * Mark the inode dirty from the very beginning,
@@ -950,7 +915,7 @@ fail_inode:
        return NULL;
 }
 
-struct file *create_write_pipe(void)
+struct file *create_write_pipe(int flags)
 {
        int err;
        struct inode *inode;
@@ -978,12 +943,12 @@ struct file *create_write_pipe(void)
        d_instantiate(dentry, inode);
 
        err = -ENFILE;
-       f = alloc_file(pipe_mnt, dentry, FMODE_WRITE, &write_pipe_fops);
+       f = alloc_file(pipe_mnt, dentry, FMODE_WRITE, &write_pipefifo_fops);
        if (!f)
                goto err_dentry;
        f->f_mapping = inode->i_mapping;
 
-       f->f_flags = O_WRONLY;
+       f->f_flags = O_WRONLY | (flags & O_NONBLOCK);
        f->f_version = 0;
 
        return f;
@@ -1007,7 +972,7 @@ void free_write_pipe(struct file *f)
        put_filp(f);
 }
 
-struct file *create_read_pipe(struct file *wrf)
+struct file *create_read_pipe(struct file *wrf, int flags)
 {
        struct file *f = get_empty_filp();
        if (!f)
@@ -1019,34 +984,37 @@ struct file *create_read_pipe(struct file *wrf)
        f->f_mapping = wrf->f_path.dentry->d_inode->i_mapping;
 
        f->f_pos = 0;
-       f->f_flags = O_RDONLY;
-       f->f_op = &read_pipe_fops;
+       f->f_flags = O_RDONLY | (flags & O_NONBLOCK);
+       f->f_op = &read_pipefifo_fops;
        f->f_mode = FMODE_READ;
        f->f_version = 0;
 
        return f;
 }
 
-int do_pipe(int *fd)
+int do_pipe_flags(int *fd, int flags)
 {
        struct file *fw, *fr;
        int error;
        int fdw, fdr;
 
-       fw = create_write_pipe();
+       if (flags & ~(O_CLOEXEC | O_NONBLOCK))
+               return -EINVAL;
+
+       fw = create_write_pipe(flags);
        if (IS_ERR(fw))
                return PTR_ERR(fw);
-       fr = create_read_pipe(fw);
+       fr = create_read_pipe(fw, flags);
        error = PTR_ERR(fr);
        if (IS_ERR(fr))
                goto err_write_pipe;
 
-       error = get_unused_fd();
+       error = get_unused_fd_flags(flags);
        if (error < 0)
                goto err_read_pipe;
        fdr = error;
 
-       error = get_unused_fd();
+       error = get_unused_fd_flags(flags);
        if (error < 0)
                goto err_fdr;
        fdw = error;
@@ -1074,16 +1042,21 @@ int do_pipe(int *fd)
        return error;
 }
 
+int do_pipe(int *fd)
+{
+       return do_pipe_flags(fd, 0);
+}
+
 /*
  * sys_pipe() is the normal C calling standard for creating
  * a pipe. It's not the way Unix traditionally does this, though.
  */
-asmlinkage long __weak sys_pipe(int __user *fildes)
+asmlinkage long __weak sys_pipe2(int __user *fildes, int flags)
 {
        int fd[2];
        int error;
 
-       error = do_pipe(fd);
+       error = do_pipe_flags(fd, flags);
        if (!error) {
                if (copy_to_user(fildes, fd, sizeof(fd))) {
                        sys_close(fd[0]);
@@ -1094,6 +1067,11 @@ asmlinkage long __weak sys_pipe(int __user *fildes)
        return error;
 }
 
+asmlinkage long __weak sys_pipe(int __user *fildes)
+{
+       return sys_pipe2(fildes, 0);
+}
+
 /*
  * pipefs should _never_ be mounted by userland - too much of security hassle,
  * no real gain from having the whole whorehouse mounted. So we don't need