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Diffstat (limited to 'fs/splice.c')
-rw-r--r--fs/splice.c122
1 files changed, 63 insertions, 59 deletions
diff --git a/fs/splice.c b/fs/splice.c
index 9bfd6af0cf45..ed91a62402e0 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -136,34 +136,33 @@ static struct pipe_buf_operations page_cache_pipe_buf_ops = {
* Pipe output worker. This sets up our pipe format with the page cache
* pipe buffer operations. Otherwise very similar to the regular pipe_writev().
*/
-static ssize_t move_to_pipe(struct inode *inode, struct page **pages,
+static ssize_t move_to_pipe(struct pipe_inode_info *pipe, struct page **pages,
int nr_pages, unsigned long offset,
unsigned long len, unsigned int flags)
{
- struct pipe_inode_info *info;
int ret, do_wakeup, i;
ret = 0;
do_wakeup = 0;
i = 0;
- mutex_lock(PIPE_MUTEX(*inode));
+ if (pipe->inode)
+ mutex_lock(&pipe->inode->i_mutex);
- info = inode->i_pipe;
for (;;) {
int bufs;
- if (!PIPE_READERS(*inode)) {
+ if (!pipe->readers) {
send_sig(SIGPIPE, current, 0);
if (!ret)
ret = -EPIPE;
break;
}
- bufs = info->nrbufs;
+ bufs = pipe->nrbufs;
if (bufs < PIPE_BUFFERS) {
- int newbuf = (info->curbuf + bufs) & (PIPE_BUFFERS - 1);
- struct pipe_buffer *buf = info->bufs + newbuf;
+ int newbuf = (pipe->curbuf + bufs) & (PIPE_BUFFERS - 1);
+ struct pipe_buffer *buf = pipe->bufs + newbuf;
struct page *page = pages[i++];
unsigned long this_len;
@@ -175,7 +174,7 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages,
buf->offset = offset;
buf->len = this_len;
buf->ops = &page_cache_pipe_buf_ops;
- info->nrbufs = ++bufs;
+ pipe->nrbufs = ++bufs;
do_wakeup = 1;
ret += this_len;
@@ -205,25 +204,25 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages,
if (do_wakeup) {
smp_mb();
- if (waitqueue_active(PIPE_WAIT(*inode)))
- wake_up_interruptible_sync(PIPE_WAIT(*inode));
- kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO,
- POLL_IN);
+ if (waitqueue_active(&pipe->wait))
+ wake_up_interruptible_sync(&pipe->wait);
+ kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
do_wakeup = 0;
}
- PIPE_WAITING_WRITERS(*inode)++;
- pipe_wait(inode);
- PIPE_WAITING_WRITERS(*inode)--;
+ pipe->waiting_writers++;
+ pipe_wait(pipe);
+ pipe->waiting_writers--;
}
- mutex_unlock(PIPE_MUTEX(*inode));
+ if (pipe->inode)
+ mutex_unlock(&pipe->inode->i_mutex);
if (do_wakeup) {
smp_mb();
- if (waitqueue_active(PIPE_WAIT(*inode)))
- wake_up_interruptible(PIPE_WAIT(*inode));
- kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, POLL_IN);
+ if (waitqueue_active(&pipe->wait))
+ wake_up_interruptible(&pipe->wait);
+ kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
}
while (i < nr_pages)
@@ -232,8 +231,9 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages,
return ret;
}
-static int __generic_file_splice_read(struct file *in, struct inode *pipe,
- size_t len, unsigned int flags)
+static int
+__generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,
+ size_t len, unsigned int flags)
{
struct address_space *mapping = in->f_mapping;
unsigned int offset, nr_pages;
@@ -298,7 +298,7 @@ static int __generic_file_splice_read(struct file *in, struct inode *pipe,
* Will read pages from given file and fill them into a pipe.
*
*/
-ssize_t generic_file_splice_read(struct file *in, struct inode *pipe,
+ssize_t generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,
size_t len, unsigned int flags)
{
ssize_t spliced;
@@ -306,6 +306,7 @@ ssize_t generic_file_splice_read(struct file *in, struct inode *pipe,
ret = 0;
spliced = 0;
+
while (len) {
ret = __generic_file_splice_read(in, pipe, len, flags);
@@ -509,11 +510,10 @@ typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *,
* key here is the 'actor' worker passed in that actually moves the data
* to the wanted destination. See pipe_to_file/pipe_to_sendpage above.
*/
-static ssize_t move_from_pipe(struct inode *inode, struct file *out,
+static ssize_t move_from_pipe(struct pipe_inode_info *pipe, struct file *out,
size_t len, unsigned int flags,
splice_actor *actor)
{
- struct pipe_inode_info *info;
int ret, do_wakeup, err;
struct splice_desc sd;
@@ -525,22 +525,22 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out,
sd.file = out;
sd.pos = out->f_pos;
- mutex_lock(PIPE_MUTEX(*inode));
+ if (pipe->inode)
+ mutex_lock(&pipe->inode->i_mutex);
- info = inode->i_pipe;
for (;;) {
- int bufs = info->nrbufs;
+ int bufs = pipe->nrbufs;
if (bufs) {
- int curbuf = info->curbuf;
- struct pipe_buffer *buf = info->bufs + curbuf;
+ int curbuf = pipe->curbuf;
+ struct pipe_buffer *buf = pipe->bufs + curbuf;
struct pipe_buf_operations *ops = buf->ops;
sd.len = buf->len;
if (sd.len > sd.total_len)
sd.len = sd.total_len;
- err = actor(info, buf, &sd);
+ err = actor(pipe, buf, &sd);
if (err) {
if (!ret && err != -ENODATA)
ret = err;
@@ -553,10 +553,10 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out,
buf->len -= sd.len;
if (!buf->len) {
buf->ops = NULL;
- ops->release(info, buf);
+ ops->release(pipe, buf);
curbuf = (curbuf + 1) & (PIPE_BUFFERS - 1);
- info->curbuf = curbuf;
- info->nrbufs = --bufs;
+ pipe->curbuf = curbuf;
+ pipe->nrbufs = --bufs;
do_wakeup = 1;
}
@@ -568,9 +568,9 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out,
if (bufs)
continue;
- if (!PIPE_WRITERS(*inode))
+ if (!pipe->writers)
break;
- if (!PIPE_WAITING_WRITERS(*inode)) {
+ if (!pipe->waiting_writers) {
if (ret)
break;
}
@@ -589,22 +589,23 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out,
if (do_wakeup) {
smp_mb();
- if (waitqueue_active(PIPE_WAIT(*inode)))
- wake_up_interruptible_sync(PIPE_WAIT(*inode));
- kill_fasync(PIPE_FASYNC_WRITERS(*inode),SIGIO,POLL_OUT);
+ if (waitqueue_active(&pipe->wait))
+ wake_up_interruptible_sync(&pipe->wait);
+ kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
do_wakeup = 0;
}
- pipe_wait(inode);
+ pipe_wait(pipe);
}
- mutex_unlock(PIPE_MUTEX(*inode));
+ if (pipe->inode)
+ mutex_unlock(&pipe->inode->i_mutex);
if (do_wakeup) {
smp_mb();
- if (waitqueue_active(PIPE_WAIT(*inode)))
- wake_up_interruptible(PIPE_WAIT(*inode));
- kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT);
+ if (waitqueue_active(&pipe->wait))
+ wake_up_interruptible(&pipe->wait);
+ kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
mutex_lock(&out->f_mapping->host->i_mutex);
@@ -616,7 +617,7 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out,
/**
* generic_file_splice_write - splice data from a pipe to a file
- * @inode: pipe inode
+ * @pipe: pipe info
* @out: file to write to
* @len: number of bytes to splice
* @flags: splice modifier flags
@@ -625,11 +626,14 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out,
* the given pipe inode to the given file.
*
*/
-ssize_t generic_file_splice_write(struct inode *inode, struct file *out,
- size_t len, unsigned int flags)
+ssize_t
+generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
+ size_t len, unsigned int flags)
{
struct address_space *mapping = out->f_mapping;
- ssize_t ret = move_from_pipe(inode, out, len, flags, pipe_to_file);
+ ssize_t ret;
+
+ ret = move_from_pipe(pipe, out, len, flags, pipe_to_file);
/*
* if file or inode is SYNC and we actually wrote some data, sync it
@@ -664,10 +668,10 @@ EXPORT_SYMBOL(generic_file_splice_write);
* is involved.
*
*/
-ssize_t generic_splice_sendpage(struct inode *inode, struct file *out,
+ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, struct file *out,
size_t len, unsigned int flags)
{
- return move_from_pipe(inode, out, len, flags, pipe_to_sendpage);
+ return move_from_pipe(pipe, out, len, flags, pipe_to_sendpage);
}
EXPORT_SYMBOL(generic_splice_sendpage);
@@ -675,8 +679,8 @@ EXPORT_SYMBOL(generic_splice_sendpage);
/*
* Attempt to initiate a splice from pipe to file.
*/
-static long do_splice_from(struct inode *pipe, struct file *out, size_t len,
- unsigned int flags)
+static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+ size_t len, unsigned int flags)
{
loff_t pos;
int ret;
@@ -698,8 +702,8 @@ static long do_splice_from(struct inode *pipe, struct file *out, size_t len,
/*
* Attempt to initiate a splice from a file to a pipe.
*/
-static long do_splice_to(struct file *in, struct inode *pipe, size_t len,
- unsigned int flags)
+static long do_splice_to(struct file *in, struct pipe_inode_info *pipe,
+ size_t len, unsigned int flags)
{
loff_t pos, isize, left;
int ret;
@@ -732,14 +736,14 @@ static long do_splice_to(struct file *in, struct inode *pipe, size_t len,
static long do_splice(struct file *in, struct file *out, size_t len,
unsigned int flags)
{
- struct inode *pipe;
+ struct pipe_inode_info *pipe;
- pipe = in->f_dentry->d_inode;
- if (pipe->i_pipe)
+ pipe = in->f_dentry->d_inode->i_pipe;
+ if (pipe)
return do_splice_from(pipe, out, len, flags);
- pipe = out->f_dentry->d_inode;
- if (pipe->i_pipe)
+ pipe = out->f_dentry->d_inode->i_pipe;
+ if (pipe)
return do_splice_to(in, pipe, len, flags);
return -EINVAL;