The patch titled
Some cleanup in the pipe code
has been removed from the -mm tree. Its filename is
some-cleanup-in-the-pipe-code.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: Some cleanup in the pipe code
From: Andi Kleen <ak@xxxxxxx>
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@xxxxxxxx: cleanup]
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/pipe.c | 155 +++++++++++++++++++++++++------------------
include/linux/fs.h | 3
2 files changed, 96 insertions(+), 62 deletions(-)
diff -puN fs/pipe.c~some-cleanup-in-the-pipe-code fs/pipe.c
--- a/fs/pipe.c~some-cleanup-in-the-pipe-code
+++ a/fs/pipe.c
@@ -874,87 +874,118 @@ fail_inode:
return NULL;
}
-int do_pipe(int *fd)
+struct file *create_write_pipe(void)
{
- struct qstr this;
- char name[32];
+ int err;
+ struct inode *inode;
+ struct file *f;
struct dentry *dentry;
- 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;
+ 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;
+ goto err_file;
- error = get_unused_fd();
- if (error < 0)
- goto close_f12_inode_i;
- j = error;
-
- 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;
+
+ f->f_flags = O_WRONLY;
+ f->f_op = &write_pipe_fops;
+ f->f_mode = FMODE_WRITE;
+ f->f_version = 0;
- return 0;
+ return f;
-close_f12_inode_i_j:
- put_unused_fd(j);
-close_f12_inode_i:
- put_unused_fd(i);
-close_f12_inode:
+ err_inode:
free_pipe_info(inode);
iput(inode);
-close_f12:
- put_filp(f2);
-close_f1:
- put_filp(f1);
-no_files:
- return error;
+ 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;
}
/*
diff -puN include/linux/fs.h~some-cleanup-in-the-pipe-code include/linux/fs.h
--- a/include/linux/fs.h~some-cleanup-in-the-pipe-code
+++ a/include/linux/fs.h
@@ -1641,6 +1641,9 @@ static inline void allow_write_access(st
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);
_
Patches currently in -mm which might be from ak@xxxxxxx are
origin.patch
i8042-activate-panic-blink-only-in-x.patch
x86_64-dump_trace-atomicity-fix.patch
deal-with-cases-of-zone_dma-meaning-the-first-zone.patch
introduce-config_zone_dma.patch
optional-zone_dma-in-the-vm.patch
x86-remove-default_ldt-and-simplify-ldt-setting.patch
msi-simplify-msi-sanity-checks-by-adding-with-generic-irq-code.patch
msi-only-use-a-single-irq_chip-for-msi-interrupts.patch
msi-refactor-and-move-the-msi-irq_chip-into-the-arch-code.patch
msi-move-the-ia64-code-into-arch-ia64.patch
htirq-tidy-up-the-htirq-code.patch
-
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