aboutsummaryrefslogtreecommitdiffstats
path: root/fs/pipe.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/pipe.c')
-rw-r--r--fs/pipe.c102
1 files changed, 46 insertions, 56 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 49c1065256f..bd3479db4b6 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -224,7 +224,7 @@ static void anon_pipe_buf_release(struct pipe_inode_info *pipe,
* and the caller has to be careful not to fault before calling
* the unmap function.
*
- * Note that this function occupies KM_USER0 if @atomic != 0.
+ * Note that this function calls kmap_atomic() if @atomic != 0.
*/
void *generic_pipe_buf_map(struct pipe_inode_info *pipe,
struct pipe_buffer *buf, int atomic)
@@ -1016,18 +1016,16 @@ fail_inode:
return NULL;
}
-struct file *create_write_pipe(int flags)
+int create_pipe_files(struct file **res, int flags)
{
int err;
- struct inode *inode;
+ struct inode *inode = get_pipe_inode();
struct file *f;
struct path path;
- struct qstr name = { .name = "" };
+ static struct qstr name = { .name = "" };
- err = -ENFILE;
- inode = get_pipe_inode();
if (!inode)
- goto err;
+ return -ENFILE;
err = -ENOMEM;
path.dentry = d_alloc_pseudo(pipe_mnt->mnt_sb, &name);
@@ -1041,62 +1039,42 @@ struct file *create_write_pipe(int flags)
f = alloc_file(&path, FMODE_WRITE, &write_pipefifo_fops);
if (!f)
goto err_dentry;
- f->f_mapping = inode->i_mapping;
f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT));
- f->f_version = 0;
- return f;
+ res[0] = alloc_file(&path, FMODE_READ, &read_pipefifo_fops);
+ if (!res[0])
+ goto err_file;
+
+ path_get(&path);
+ res[0]->f_flags = O_RDONLY | (flags & O_NONBLOCK);
+ res[1] = f;
+ return 0;
- err_dentry:
+err_file:
+ put_filp(f);
+err_dentry:
free_pipe_info(inode);
path_put(&path);
- return ERR_PTR(err);
+ return err;
- err_inode:
+err_inode:
free_pipe_info(inode);
iput(inode);
- err:
- return ERR_PTR(err);
-}
-
-void free_write_pipe(struct file *f)
-{
- free_pipe_info(f->f_dentry->d_inode);
- path_put(&f->f_path);
- put_filp(f);
-}
-
-struct file *create_read_pipe(struct file *wrf, int flags)
-{
- /* Grab pipe from the writer */
- struct file *f = alloc_file(&wrf->f_path, FMODE_READ,
- &read_pipefifo_fops);
- if (!f)
- return ERR_PTR(-ENFILE);
-
- path_get(&wrf->f_path);
- f->f_flags = O_RDONLY | (flags & O_NONBLOCK);
-
- return f;
+ return err;
}
-int do_pipe_flags(int *fd, int flags)
+static int __do_pipe_flags(int *fd, struct file **files, int flags)
{
- struct file *fw, *fr;
int error;
int fdw, fdr;
if (flags & ~(O_CLOEXEC | O_NONBLOCK | O_DIRECT))
return -EINVAL;
- fw = create_write_pipe(flags);
- if (IS_ERR(fw))
- return PTR_ERR(fw);
- fr = create_read_pipe(fw, flags);
- error = PTR_ERR(fr);
- if (IS_ERR(fr))
- goto err_write_pipe;
+ error = create_pipe_files(files, flags);
+ if (error)
+ return error;
error = get_unused_fd_flags(flags);
if (error < 0)
@@ -1109,20 +1087,26 @@ int do_pipe_flags(int *fd, int flags)
fdw = error;
audit_fd_pair(fdr, fdw);
- fd_install(fdr, fr);
- fd_install(fdw, fw);
fd[0] = fdr;
fd[1] = fdw;
-
return 0;
err_fdr:
put_unused_fd(fdr);
err_read_pipe:
- path_put(&fr->f_path);
- put_filp(fr);
- err_write_pipe:
- free_write_pipe(fw);
+ fput(files[0]);
+ fput(files[1]);
+ return error;
+}
+
+int do_pipe_flags(int *fd, int flags)
+{
+ struct file *files[2];
+ int error = __do_pipe_flags(fd, files, flags);
+ if (!error) {
+ fd_install(fd[0], files[0]);
+ fd_install(fd[1], files[1]);
+ }
return error;
}
@@ -1132,15 +1116,21 @@ int do_pipe_flags(int *fd, int flags)
*/
SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)
{
+ struct file *files[2];
int fd[2];
int error;
- error = do_pipe_flags(fd, flags);
+ error = __do_pipe_flags(fd, files, flags);
if (!error) {
- if (copy_to_user(fildes, fd, sizeof(fd))) {
- sys_close(fd[0]);
- sys_close(fd[1]);
+ if (unlikely(copy_to_user(fildes, fd, sizeof(fd)))) {
+ fput(files[0]);
+ fput(files[1]);
+ put_unused_fd(fd[0]);
+ put_unused_fd(fd[1]);
error = -EFAULT;
+ } else {
+ fd_install(fd[0], files[0]);
+ fd_install(fd[1], files[1]);
}
}
return error;