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[PATCH] splice: fix problem introduced with inode diet 

After the inode slimming patch that unionised i_pipe/i_bdev/i_cdev, it's
no longer enough to check for existance of ->i_pipe to verify that this
is a pipe.

Original patch from Eric Dumazet <dada1@cosmosbay.com>
Final solution suggested by Linus.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jens Axboe 2006-11-04 12:49:32 +01:00 committed by Linus Torvalds
parent aaa9b97139
commit ddac0d39cf
1 changed files with 20 additions and 6 deletions
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26
fs/splice.c
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@ -1108,6 +1108,19 @@ out_release:
EXPORT_SYMBOL(do_splice_direct);
/*
* After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same
* location, so checking ->i_pipe is not enough to verify that this is a
* pipe.
*/
static inline struct pipe_inode_info *pipe_info(struct inode *inode)
{
if (S_ISFIFO(inode->i_mode))
return inode->i_pipe;
return NULL;
}
/*
* Determine where to splice to/from.
*/
@ -1119,7 +1132,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
loff_t offset, *off;
long ret;
pipe = in->f_dentry->d_inode->i_pipe;
pipe = pipe_info(in->f_dentry->d_inode);
if (pipe) {
if (off_in)
return -ESPIPE;
@ -1140,7 +1153,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
return ret;
}
pipe = out->f_dentry->d_inode->i_pipe;
pipe = pipe_info(out->f_dentry->d_inode);
if (pipe) {
if (off_out)
return -ESPIPE;
@ -1298,7 +1311,7 @@ static int get_iovec_page_array(const struct iovec __user *iov,
static long do_vmsplice(struct file *file, const struct iovec __user *iov,
unsigned long nr_segs, unsigned int flags)
{
struct pipe_inode_info *pipe = file->f_dentry->d_inode->i_pipe;
struct pipe_inode_info *pipe;
struct page *pages[PIPE_BUFFERS];
struct partial_page partial[PIPE_BUFFERS];
struct splice_pipe_desc spd = {
@ -1308,7 +1321,8 @@ static long do_vmsplice(struct file *file, const struct iovec __user *iov,
.ops = &user_page_pipe_buf_ops,
};
if (unlikely(!pipe))
pipe = pipe_info(file->f_dentry->d_inode);
if (!pipe)
return -EBADF;
if (unlikely(nr_segs > UIO_MAXIOV))
return -EINVAL;
@ -1535,8 +1549,8 @@ static int link_pipe(struct pipe_inode_info *ipipe,
static long do_tee(struct file *in, struct file *out, size_t len,
unsigned int flags)
{
struct pipe_inode_info *ipipe = in->f_dentry->d_inode->i_pipe;
struct pipe_inode_info *opipe = out->f_dentry->d_inode->i_pipe;
struct pipe_inode_info *ipipe = pipe_info(in->f_dentry->d_inode);
struct pipe_inode_info *opipe = pipe_info(out->f_dentry->d_inode);
int ret = -EINVAL;
/*