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pipe: introduce struct file_operations pipeanon_fops

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So that fifos and anonymous pipes could have different f_op methods.
Preparation to simplify the next patch.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20250205181747.GB13817@redhat.com
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Oleg Nesterov 2025-02-05 19:17:47 +01:00 committed by Christian Brauner
parent 2014c95afe
commit 262b2fa99c
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 20 additions and 5 deletions
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25
fs/pipe.c
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@ -878,6 +878,8 @@ static const struct dentry_operations pipefs_dentry_operations = {
.d_dname = pipefs_dname,
};
static const struct file_operations pipeanon_fops;
static struct inode * get_pipe_inode(void)
{
struct inode *inode = new_inode_pseudo(pipe_mnt->mnt_sb);
@ -895,7 +897,7 @@ static struct inode * get_pipe_inode(void)
inode->i_pipe = pipe;
pipe->files = 2;
pipe->readers = pipe->writers = 1;
inode->i_fop = &pipefifo_fops;
inode->i_fop = &pipeanon_fops;
/*
* Mark the inode dirty from the very beginning,
@ -938,7 +940,7 @@ int create_pipe_files(struct file **res, int flags)
f = alloc_file_pseudo(inode, pipe_mnt, "",
O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT)),
&pipefifo_fops);
&pipeanon_fops);
if (IS_ERR(f)) {
free_pipe_info(inode->i_pipe);
iput(inode);
@ -949,7 +951,7 @@ int create_pipe_files(struct file **res, int flags)
f->f_pipe = 0;
res[0] = alloc_file_clone(f, O_RDONLY | (flags & O_NONBLOCK),
&pipefifo_fops);
&pipeanon_fops);
if (IS_ERR(res[0])) {
put_pipe_info(inode, inode->i_pipe);
fput(f);
@ -1107,8 +1109,8 @@ static void wake_up_partner(struct pipe_inode_info *pipe)
static int fifo_open(struct inode *inode, struct file *filp)
{
bool is_pipe = inode->i_fop == &pipeanon_fops;
struct pipe_inode_info *pipe;
bool is_pipe = inode->i_sb->s_magic == PIPEFS_MAGIC;
int ret;
filp->f_pipe = 0;
@ -1241,6 +1243,17 @@ const struct file_operations pipefifo_fops = {
.splice_write = iter_file_splice_write,
};
static const struct file_operations pipeanon_fops = {
.open = fifo_open,
.read_iter = pipe_read,
.write_iter = pipe_write,
.poll = pipe_poll,
.unlocked_ioctl = pipe_ioctl,
.release = pipe_release,
.fasync = pipe_fasync,
.splice_write = iter_file_splice_write,
};
/*
* Currently we rely on the pipe array holding a power-of-2 number
* of pages. Returns 0 on error.
@ -1388,7 +1401,9 @@ struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice)
{
struct pipe_inode_info *pipe = file->private_data;
if (file->f_op != &pipefifo_fops || !pipe)
if (!pipe)
return NULL;
if (file->f_op != &pipefifo_fops && file->f_op != &pipeanon_fops)
return NULL;
if (for_splice && pipe_has_watch_queue(pipe))
return NULL;