pipe: fold file_operations instances in one

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 38 insertions, 195 deletions

diff --git a/fs/inode.c b/fs/inode.c
index f5f7c06c36fb..5b76d9b1a884 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1803,7 +1803,7 @@ void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev)
                 inode->i_fop = &def_blk_fops;
                 inode->i_rdev = rdev;
         } else if (S_ISFIFO(mode))
-                inode->i_fop = &def_fifo_fops;
+                inode->i_fop = &pipefifo_fops;
         else if (S_ISSOCK(mode))
                 inode->i_fop = &bad_sock_fops;
         else
diff --git a/fs/internal.h b/fs/internal.h
index 4be78237d896..eaa75f75b625 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -130,3 +130,8 @@ extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
  * read_write.c
  */
 extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
+
+/*
+ * pipe.c
+ */
+extern const struct file_operations pipefifo_fops;
diff --git a/fs/pipe.c b/fs/pipe.c
index aed80c25cd40..099ac3bf89f9 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -25,6 +25,8 @@
 #include <asm/uaccess.h>
 #include <asm/ioctls.h>
 
+#include "internal.h"
+
 /*
  * The max size that a non-root user is allowed to grow the pipe. Can
  * be set by root in /proc/sys/fs/pipe-max-size
@@ -662,19 +664,6 @@ out:
         return ret;
 }
 
-static ssize_t
-bad_pipe_r(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
-{
-        return -EBADF;
-}
-
-static ssize_t
-bad_pipe_w(struct file *filp, const char __user *buf, size_t count,
-           loff_t *ppos)
-{
-        return -EBADF;
-}
-
 static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
         struct inode *inode = file_inode(filp);
@@ -734,14 +723,16 @@ pipe_poll(struct file *filp, poll_table *wait)
 }
 
 static int
-pipe_release(struct inode *inode, int decr, int decw)
+pipe_release(struct inode *inode, struct file *file)
 {
         struct pipe_inode_info *pipe;
 
         mutex_lock(&inode->i_mutex);
         pipe = inode->i_pipe;
-        pipe->readers -= decr;
-        pipe->writers -= decw;
+        if (file->f_mode & FMODE_READ)
+                pipe->readers--;
+        if (file->f_mode & FMODE_WRITE)
+                pipe->writers--;
 
         if (!pipe->readers && !pipe->writers) {
                 free_pipe_info(inode);
@@ -756,174 +747,25 @@ pipe_release(struct inode *inode, int decr, int decw)
 }
 
 static int
-pipe_read_fasync(int fd, struct file *filp, int on)
-{
-        struct inode *inode = file_inode(filp);
-        int retval;
-
-        mutex_lock(&inode->i_mutex);
-        retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_readers);
-        mutex_unlock(&inode->i_mutex);
-
-        return retval;
-}
-
-
-static int
-pipe_write_fasync(int fd, struct file *filp, int on)
-{
-        struct inode *inode = file_inode(filp);
-        int retval;
-
-        mutex_lock(&inode->i_mutex);
-        retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_writers);
-        mutex_unlock(&inode->i_mutex);
-
-        return retval;
-}
-
-
-static int
-pipe_rdwr_fasync(int fd, struct file *filp, int on)
+pipe_fasync(int fd, struct file *filp, int on)
 {
         struct inode *inode = file_inode(filp);
         struct pipe_inode_info *pipe = inode->i_pipe;
-        int retval;
+        int retval = 0;
 
         mutex_lock(&inode->i_mutex);
-        retval = fasync_helper(fd, filp, on, &pipe->fasync_readers);
-        if (retval >= 0) {
+        if (filp->f_mode & FMODE_READ)
+                retval = fasync_helper(fd, filp, on, &pipe->fasync_readers);
+        if ((filp->f_mode & FMODE_WRITE) && retval >= 0) {
                 retval = fasync_helper(fd, filp, on, &pipe->fasync_writers);
-                if (retval < 0) /* this can happen only if on == T */
+                if (retval < 0 && (filp->f_mode & FMODE_READ))
+                        /* this can happen only if on == T */
                         fasync_helper(-1, filp, 0, &pipe->fasync_readers);
         }
         mutex_unlock(&inode->i_mutex);
         return retval;
 }
 
-
-static int
-pipe_read_release(struct inode *inode, struct file *filp)
-{
-        return pipe_release(inode, 1, 0);
-}
-
-static int
-pipe_write_release(struct inode *inode, struct file *filp)
-{
-        return pipe_release(inode, 0, 1);
-}
-
-static int
-pipe_rdwr_release(struct inode *inode, struct file *filp)
-{
-        int decr, decw;
-
-        decr = (filp->f_mode & FMODE_READ) != 0;
-        decw = (filp->f_mode & FMODE_WRITE) != 0;
-        return pipe_release(inode, decr, decw);
-}
-
-static int
-pipe_read_open(struct inode *inode, struct file *filp)
-{
-        int ret = -ENOENT;
-
-        mutex_lock(&inode->i_mutex);
-
-        if (inode->i_pipe) {
-                ret = 0;
-                inode->i_pipe->readers++;
-        }
-
-        mutex_unlock(&inode->i_mutex);
-
-        return ret;
-}
-
-static int
-pipe_write_open(struct inode *inode, struct file *filp)
-{
-        int ret = -ENOENT;
-
-        mutex_lock(&inode->i_mutex);
-
-        if (inode->i_pipe) {
-                ret = 0;
-                inode->i_pipe->writers++;
-        }
-
-        mutex_unlock(&inode->i_mutex);
-
-        return ret;
-}
-
-static int
-pipe_rdwr_open(struct inode *inode, struct file *filp)
-{
-        int ret = -ENOENT;
-
-        if (!(filp->f_mode & (FMODE_READ|FMODE_WRITE)))
-                return -EINVAL;
-
-        mutex_lock(&inode->i_mutex);
-
-        if (inode->i_pipe) {
-                ret = 0;
-                if (filp->f_mode & FMODE_READ)
-                        inode->i_pipe->readers++;
-                if (filp->f_mode & FMODE_WRITE)
-                        inode->i_pipe->writers++;
-        }
-
-        mutex_unlock(&inode->i_mutex);
-
-        return ret;
-}
-
-/*
- * The file_operations structs are not static because they
- * are also used in linux/fs/fifo.c to do operations on FIFOs.
- *
- * Pipes reuse fifos' file_operations structs.
- */
-const struct file_operations read_pipefifo_fops = {
-        .llseek         = no_llseek,
-        .read           = do_sync_read,
-        .aio_read       = pipe_read,
-        .write          = bad_pipe_w,
-        .poll           = pipe_poll,
-        .unlocked_ioctl = pipe_ioctl,
-        .open           = pipe_read_open,
-        .release        = pipe_read_release,
-        .fasync         = pipe_read_fasync,
-};
-
-const struct file_operations write_pipefifo_fops = {
-        .llseek         = no_llseek,
-        .read           = bad_pipe_r,
-        .write          = do_sync_write,
-        .aio_write      = pipe_write,
-        .poll           = pipe_poll,
-        .unlocked_ioctl = pipe_ioctl,
-        .open           = pipe_write_open,
-        .release        = pipe_write_release,
-        .fasync         = pipe_write_fasync,
-};
-
-const struct file_operations rdwr_pipefifo_fops = {
-        .llseek         = no_llseek,
-        .read           = do_sync_read,
-        .aio_read       = pipe_read,
-        .write          = do_sync_write,
-        .aio_write      = pipe_write,
-        .poll           = pipe_poll,
-        .unlocked_ioctl = pipe_ioctl,
-        .open           = pipe_rdwr_open,
-        .release        = pipe_rdwr_release,
-        .fasync         = pipe_rdwr_fasync,
-};
-
 struct pipe_inode_info * alloc_pipe_info(struct inode *inode)
 {
         struct pipe_inode_info *pipe;
@@ -996,7 +838,7 @@ static struct inode * get_pipe_inode(void)
         inode->i_pipe = pipe;
 
         pipe->readers = pipe->writers = 1;
-        inode->i_fop = &rdwr_pipefifo_fops;
+        inode->i_fop = &pipefifo_fops;
 
         /*
          * Mark the inode dirty from the very beginning,
@@ -1039,13 +881,13 @@ int create_pipe_files(struct file **res, int flags)
         d_instantiate(path.dentry, inode);
 
         err = -ENFILE;
-        f = alloc_file(&path, FMODE_WRITE, &write_pipefifo_fops);
+        f = alloc_file(&path, FMODE_WRITE, &pipefifo_fops);
         if (IS_ERR(f))
                 goto err_dentry;
 
         f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT));
 
-        res[0] = alloc_file(&path, FMODE_READ, &read_pipefifo_fops);
+        res[0] = alloc_file(&path, FMODE_READ, &pipefifo_fops);
         if (IS_ERR(res[0]))
                 goto err_file;
 
@@ -1164,6 +1006,7 @@ static void wake_up_partner(struct inode* inode)
 static int fifo_open(struct inode *inode, struct file *filp)
 {
         struct pipe_inode_info *pipe;
+        bool is_pipe = inode->i_sb->s_magic == PIPEFS_MAGIC;
         int ret;
 
         mutex_lock(&inode->i_mutex);
@@ -1187,12 +1030,11 @@ static int fifo_open(struct inode *inode, struct file *filp)
          *  POSIX.1 says that O_NONBLOCK means return with the FIFO
          *  opened, even when there is no process writing the FIFO.
          */
-                filp->f_op = &read_pipefifo_fops;
                 pipe->r_counter++;
                 if (pipe->readers++ == 0)
                         wake_up_partner(inode);
 
-                if (!pipe->writers) {
+                if (!is_pipe && !pipe->writers) {
                         if ((filp->f_flags & O_NONBLOCK)) {
                                 /* suppress POLLHUP until we have
                                  * seen a writer */
@@ -1211,15 +1053,14 @@ static int fifo_open(struct inode *inode, struct file *filp)
          *  errno=ENXIO when there is no process reading the FIFO.
          */
                 ret = -ENXIO;
-                if ((filp->f_flags & O_NONBLOCK) && !pipe->readers)
+                if (!is_pipe && (filp->f_flags & O_NONBLOCK) && !pipe->readers)
                         goto err;
 
-                filp->f_op = &write_pipefifo_fops;
                 pipe->w_counter++;
                 if (!pipe->writers++)
                         wake_up_partner(inode);
 
-                if (!pipe->readers) {
+                if (!is_pipe && !pipe->readers) {
                         if (wait_for_partner(inode, &pipe->r_counter))
                                 goto err_wr;
                 }
@@ -1232,7 +1073,6 @@ static int fifo_open(struct inode *inode, struct file *filp)
          *  This implementation will NEVER block on a O_RDWR open, since
          *  the process can at least talk to itself.
          */
-                filp->f_op = &rdwr_pipefifo_fops;
 
                 pipe->readers++;
                 pipe->writers++;
@@ -1272,14 +1112,17 @@ err_nocleanup:
         return ret;
 }
 
-/*
- * Dummy default file-operations: the only thing this does
- * is contain the open that then fills in the correct operations
- * depending on the access mode of the file...
- */
-const struct file_operations def_fifo_fops = {
-        .open           = fifo_open,    /* will set read_ or write_pipefifo_fops */
-        .llseek         = noop_llseek,
+const struct file_operations pipefifo_fops = {
+        .open           = fifo_open,
+        .llseek         = no_llseek,
+        .read           = do_sync_read,
+        .aio_read       = pipe_read,
+        .write          = do_sync_write,
+        .aio_write      = pipe_write,
+        .poll           = pipe_poll,
+        .unlocked_ioctl = pipe_ioctl,
+        .release        = pipe_release,
+        .fasync         = pipe_fasync,
 };
 
 /*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 578a66e6ee72..b1f28b02ede6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2080,7 +2080,6 @@ extern int sync_filesystem(struct super_block *);
 extern const struct file_operations def_blk_fops;
 extern const struct file_operations def_chr_fops;
 extern const struct file_operations bad_sock_fops;
-extern const struct file_operations def_fifo_fops;
 #ifdef CONFIG_BLOCK
 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
@@ -2152,10 +2151,6 @@ extern void init_special_inode(struct inode *, umode_t, dev_t);
 extern void make_bad_inode(struct inode *);
 extern int is_bad_inode(struct inode *);
 
-extern const struct file_operations read_pipefifo_fops;
-extern const struct file_operations write_pipefifo_fops;
-extern const struct file_operations rdwr_pipefifo_fops;
-
 #ifdef CONFIG_BLOCK
 /*
  * return READ, READA, or WRITE