#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/audit.h>
+#include <linux/syscalls.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
static int
pipe_read_release(struct inode *inode, struct file *filp)
{
- pipe_read_fasync(-1, filp, 0);
return pipe_release(inode, 1, 0);
}
static int
pipe_write_release(struct inode *inode, struct file *filp)
{
- pipe_write_fasync(-1, filp, 0);
return pipe_release(inode, 0, 1);
}
{
int decr, decw;
- pipe_rdwr_fasync(-1, filp, 0);
decr = (filp->f_mode & FMODE_READ) != 0;
decw = (filp->f_mode & FMODE_WRITE) != 0;
return pipe_release(inode, decr, decw);
/*
* 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 = {
+const struct file_operations read_pipefifo_fops = {
.llseek = no_llseek,
.read = do_sync_read,
.aio_read = pipe_read,
.fasync = pipe_read_fasync,
};
-const struct file_operations write_fifo_fops = {
+const struct file_operations write_pipefifo_fops = {
.llseek = no_llseek,
.read = bad_pipe_r,
.write = do_sync_write,
.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 = {
- .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,
-};
-
-static const struct file_operations write_pipe_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,
-};
-
-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,
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,
*/
inode->i_state = I_DIRTY;
inode->i_mode = S_IFIFO | S_IRUSR | S_IWUSR;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
return inode;
return NULL;
}
-struct file *create_write_pipe(void)
+struct file *create_write_pipe(int flags)
{
int err;
struct inode *inode;
struct dentry *dentry;
struct qstr name = { .name = "" };
- f = get_empty_filp();
- if (!f)
- return ERR_PTR(-ENFILE);
err = -ENFILE;
inode = get_pipe_inode();
if (!inode)
- goto err_file;
+ goto err;
err = -ENOMEM;
dentry = d_alloc(pipe_mnt->mnt_sb->s_root, &name);
*/
dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, inode);
- f->f_path.mnt = mntget(pipe_mnt);
- f->f_path.dentry = dentry;
+
+ err = -ENFILE;
+ 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_op = &write_pipe_fops;
- f->f_mode = FMODE_WRITE;
+ f->f_flags = O_WRONLY | (flags & O_NONBLOCK);
f->f_version = 0;
return f;
+ err_dentry:
+ free_pipe_info(inode);
+ dput(dentry);
+ return ERR_PTR(err);
+
err_inode:
free_pipe_info(inode);
iput(inode);
- err_file:
- put_filp(f);
+ err:
return ERR_PTR(err);
}
void free_write_pipe(struct file *f)
{
free_pipe_info(f->f_dentry->d_inode);
- dput(f->f_path.dentry);
- mntput(f->f_path.mnt);
+ path_put(&f->f_path);
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)
return ERR_PTR(-ENFILE);
/* Grab pipe from the writer */
- f->f_path.mnt = mntget(wrf->f_path.mnt);
- f->f_path.dentry = dget(wrf->f_path.dentry);
+ f->f_path = wrf->f_path;
+ path_get(&wrf->f_path);
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;
- error = audit_fd_pair(fdr, fdw);
- if (error < 0)
- goto err_fdw;
-
+ audit_fd_pair(fdr, fdw);
fd_install(fdr, fr);
fd_install(fdw, fw);
fd[0] = fdr;
return 0;
- err_fdw:
- put_unused_fd(fdw);
err_fdr:
put_unused_fd(fdr);
err_read_pipe:
- dput(fr->f_dentry);
- mntput(fr->f_vfsmnt);
+ path_put(&fr->f_path);
put_filp(fr);
err_write_pipe:
free_write_pipe(fw);
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.
+ */
+SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)
+{
+ int fd[2];
+ int error;
+
+ error = do_pipe_flags(fd, flags);
+ if (!error) {
+ if (copy_to_user(fildes, fd, sizeof(fd))) {
+ sys_close(fd[0]);
+ sys_close(fd[1]);
+ error = -EFAULT;
+ }
+ }
+ return error;
+}
+
+SYSCALL_DEFINE1(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
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff