Commit d6cbd281 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

[PATCH] Some cleanup in the pipe code 



Split the big and hard to read do_pipe function into smaller pieces.

This creates new create_write_pipe/free_write_pipe/create_read_pipe
functions.  These functions are made global so that they can be used by
other parts of the kernel.

The resulting code is more generic and easier to read and has cleaner error
handling and less gotos.

[akpm@osdl.org: cleanup]
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 65da4d81

fs/pipe.c

+93 −62
Original line number Diff line number Diff line
@@ -874,86 +874,117 @@ fail_inode: 
	return NULL;

}



int do_pipe(int *fd)

struct file *create_write_pipe(void)

{

	struct qstr this;

	char name[32];

	struct dentry *dentry;

	int err;

	struct inode *inode;

	struct file *f1, *f2;

	int error;

	int i, j;



	error = -ENFILE;

	f1 = get_empty_filp();

	if (!f1)

		goto no_files;



	f2 = get_empty_filp();

	if (!f2)

		goto close_f1;

	struct file *f;

	struct dentry *dentry;

	char name[32];

	struct qstr this;



	f = get_empty_filp();

	if (!f)

		return ERR_PTR(-ENFILE);

	err = -ENFILE;

	inode = get_pipe_inode();

	if (!inode)

		goto close_f12;



	error = get_unused_fd();

	if (error < 0)

		goto close_f12_inode;

	i = error;



	error = get_unused_fd();

	if (error < 0)

		goto close_f12_inode_i;

	j = error;

		goto err_file;



	error = -ENOMEM;

	sprintf(name, "[%lu]", inode->i_ino);

	this.name = name;

	this.len = strlen(name);

	this.hash = inode->i_ino; /* will go */

	err = -ENOMEM;

	dentry = d_alloc(pipe_mnt->mnt_sb->s_root, &this);

	if (!dentry)

		goto close_f12_inode_i_j;

		goto err_inode;



	dentry->d_op = &pipefs_dentry_operations;

	d_add(dentry, inode);

	f1->f_vfsmnt = f2->f_vfsmnt = mntget(mntget(pipe_mnt));

	f1->f_dentry = f2->f_dentry = dget(dentry);

	f1->f_mapping = f2->f_mapping = inode->i_mapping;



	/* read file */

	f1->f_pos = f2->f_pos = 0;

	f1->f_flags = O_RDONLY;

	f1->f_op = &read_pipe_fops;

	f1->f_mode = FMODE_READ;

	f1->f_version = 0;



	/* write file */

	f2->f_flags = O_WRONLY;

	f2->f_op = &write_pipe_fops;

	f2->f_mode = FMODE_WRITE;

	f2->f_version = 0;



	fd_install(i, f1);

	fd_install(j, f2);

	fd[0] = i;

	fd[1] = j;

	f->f_vfsmnt = mntget(pipe_mnt);

	f->f_dentry = dentry;

	f->f_mapping = inode->i_mapping;



	return 0;

	f->f_flags = O_WRONLY;

	f->f_op = &write_pipe_fops;

	f->f_mode = FMODE_WRITE;

	f->f_version = 0;



close_f12_inode_i_j:

	put_unused_fd(j);

close_f12_inode_i:

	put_unused_fd(i);

close_f12_inode:

	return f;



 err_inode:

	free_pipe_info(inode);

	iput(inode);

close_f12:

	put_filp(f2);

close_f1:

	put_filp(f1);

no_files:

 err_file:

	put_filp(f);

	return ERR_PTR(err);

}



void free_write_pipe(struct file *f)

{

	mntput(f->f_vfsmnt);

	dput(f->f_dentry);

	put_filp(f);

}



struct file *create_read_pipe(struct file *wrf)

{

	struct file *f = get_empty_filp();

	if (!f)

		return ERR_PTR(-ENFILE);



	/* Grab pipe from the writer */

	f->f_vfsmnt = mntget(wrf->f_vfsmnt);

	f->f_dentry = dget(wrf->f_dentry);

	f->f_mapping = wrf->f_dentry->d_inode->i_mapping;



	f->f_pos = 0;

	f->f_flags = O_RDONLY;

	f->f_op = &read_pipe_fops;

	f->f_mode = FMODE_READ;

	f->f_version = 0;



	return f;

}



int do_pipe(int *fd)

{

	struct file *fw, *fr;

	int error;

	int fdw, fdr;



	fw = create_write_pipe();

	if (IS_ERR(fw))

		return PTR_ERR(fw);

	fr = create_read_pipe(fw);

	error = PTR_ERR(fr);

	if (IS_ERR(fr))

		goto err_write_pipe;



	error = get_unused_fd();

	if (error < 0)

		goto err_read_pipe;

	fdr = error;



	error = get_unused_fd();

	if (error < 0)

		goto err_fdr;

	fdw = error;



	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:

	put_filp(fr);

 err_write_pipe:

	free_write_pipe(fw);

	return error;

}

include/linux/fs.h

+3 −0
Original line number Diff line number Diff line
@@ -1641,6 +1641,9 @@ static inline void allow_write_access(struct file *file) 
		atomic_inc(&file->f_dentry->d_inode->i_writecount);

}

extern int do_pipe(int *);

extern struct file *create_read_pipe(struct file *f);

extern struct file *create_write_pipe(void);

extern void free_write_pipe(struct file *);



extern int open_namei(int dfd, const char *, int, int, struct nameidata *);

extern int may_open(struct nameidata *, int, int);

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