16 files changed, 282 insertions, 70 deletions

diff --git a/arch/i386/kernel/syscall_table.S b/arch/i386/kernel/syscall_table.S
index 4f58b9c0efe3..f48bef15b4f0 100644
--- a/arch/i386/kernel/syscall_table.S
+++ b/arch/i386/kernel/syscall_table.S
@@ -314,3 +314,4 @@ ENTRY(sys_call_table)
         .long sys_get_robust_list
         .long sys_splice
         .long sys_sync_file_range
+        .long sys_tee                   /* 315 */
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 6e16f6b35bd3..e30798811216 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -1609,5 +1609,6 @@ sys_call_table:
         data8 sys_set_robust_list
         data8 sys_get_robust_list
         data8 sys_sync_file_range               // 1300
+        data8 sys_tee
 
         .org sys_call_table + 8*NR_syscalls     // guard against failures to increase NR_syscalls
diff --git a/arch/powerpc/kernel/systbl.S b/arch/powerpc/kernel/systbl.S
index 1424eab450ee..a14c96403840 100644
--- a/arch/powerpc/kernel/systbl.S
+++ b/arch/powerpc/kernel/systbl.S
@@ -323,3 +323,4 @@ COMPAT_SYS(pselect6)
 COMPAT_SYS(ppoll)
 SYSCALL(unshare)
 SYSCALL(splice)
+SYSCALL(tee)
diff --git a/fs/pipe.c b/fs/pipe.c
index e984beb93a0e..7fefb10db8d9 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -131,12 +131,19 @@ static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
         return 0;
 }
 
+static void anon_pipe_buf_get(struct pipe_inode_info *info,
+                              struct pipe_buffer *buf)
+{
+        page_cache_get(buf->page);
+}
+
 static struct pipe_buf_operations anon_pipe_buf_ops = {
         .can_merge = 1,
         .map = anon_pipe_buf_map,
         .unmap = anon_pipe_buf_unmap,
         .release = anon_pipe_buf_release,
         .steal = anon_pipe_buf_steal,
+        .get = anon_pipe_buf_get,
 };
 
 static ssize_t
diff --git a/fs/splice.c b/fs/splice.c
index e50a460239dd..8d57e89924a6 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -125,12 +125,19 @@ static void page_cache_pipe_buf_unmap(struct pipe_inode_info *info,
         kunmap(buf->page);
 }
 
+static void page_cache_pipe_buf_get(struct pipe_inode_info *info,
+                                    struct pipe_buffer *buf)
+{
+        page_cache_get(buf->page);
+}
+
 static struct pipe_buf_operations page_cache_pipe_buf_ops = {
         .can_merge = 0,
         .map = page_cache_pipe_buf_map,
         .unmap = page_cache_pipe_buf_unmap,
         .release = page_cache_pipe_buf_release,
         .steal = page_cache_pipe_buf_steal,
+        .get = page_cache_pipe_buf_get,
 };
 
 /*
@@ -231,8 +238,9 @@ static ssize_t move_to_pipe(struct pipe_inode_info *pipe, struct page **pages,
 }
 
 static int
-__generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,
-                           size_t len, unsigned int flags)
+__generic_file_splice_read(struct file *in, loff_t *ppos,
+                           struct pipe_inode_info *pipe, size_t len,
+                           unsigned int flags)
 {
         struct address_space *mapping = in->f_mapping;
         unsigned int offset, nr_pages;
@@ -241,8 +249,8 @@ __generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,
         pgoff_t index;
         int i, error;
 
-        index = in->f_pos >> PAGE_CACHE_SHIFT;
-        offset = in->f_pos & ~PAGE_CACHE_MASK;
+        index = *ppos >> PAGE_CACHE_SHIFT;
+        offset = *ppos & ~PAGE_CACHE_MASK;
         nr_pages = (len + offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 
         if (nr_pages > PIPE_BUFFERS)
@@ -348,8 +356,9 @@ fill_it:
  *
  * Will read pages from given file and fill them into a pipe.
  */
-ssize_t generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,
-                                 size_t len, unsigned int flags)
+ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
+                                 struct pipe_inode_info *pipe, size_t len,
+                                 unsigned int flags)
 {
         ssize_t spliced;
         int ret;
@@ -358,12 +367,12 @@ ssize_t generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,
         spliced = 0;
 
         while (len) {
-                ret = __generic_file_splice_read(in, pipe, len, flags);
+                ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
 
                 if (ret <= 0)
                         break;
 
-                in->f_pos += ret;
+                *ppos += ret;
                 len -= ret;
                 spliced += ret;
 
@@ -561,7 +570,7 @@ typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *,
  * to the wanted destination. See pipe_to_file/pipe_to_sendpage above.
  */
 static ssize_t move_from_pipe(struct pipe_inode_info *pipe, struct file *out,
-                              size_t len, unsigned int flags,
+                              loff_t *ppos, size_t len, unsigned int flags,
                               splice_actor *actor)
 {
         int ret, do_wakeup, err;
@@ -573,7 +582,7 @@ static ssize_t move_from_pipe(struct pipe_inode_info *pipe, struct file *out,
         sd.total_len = len;
         sd.flags = flags;
         sd.file = out;
-        sd.pos = out->f_pos;
+        sd.pos = *ppos;
 
         if (pipe->inode)
                 mutex_lock(&pipe->inode->i_mutex);
@@ -656,9 +665,7 @@ static ssize_t move_from_pipe(struct pipe_inode_info *pipe, struct file *out,
                 kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
         }
 
-        out->f_pos = sd.pos;
         return ret;
-
 }
 
 /**
@@ -674,12 +681,12 @@ static ssize_t move_from_pipe(struct pipe_inode_info *pipe, struct file *out,
  */
 ssize_t
 generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
-                          size_t len, unsigned int flags)
+                          loff_t *ppos, size_t len, unsigned int flags)
 {
         struct address_space *mapping = out->f_mapping;
         ssize_t ret;
 
-        ret = move_from_pipe(pipe, out, len, flags, pipe_to_file);
+        ret = move_from_pipe(pipe, out, ppos, len, flags, pipe_to_file);
 
         /*
          * If file or inode is SYNC and we actually wrote some data, sync it.
@@ -715,9 +722,9 @@ EXPORT_SYMBOL(generic_file_splice_write);
  *
  */
 ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, struct file *out,
-                                size_t len, unsigned int flags)
+                                loff_t *ppos, size_t len, unsigned int flags)
 {
-        return move_from_pipe(pipe, out, len, flags, pipe_to_sendpage);
+        return move_from_pipe(pipe, out, ppos, len, flags, pipe_to_sendpage);
 }
 
 EXPORT_SYMBOL(generic_splice_sendpage);
@@ -726,9 +733,8 @@ EXPORT_SYMBOL(generic_splice_sendpage);
  * Attempt to initiate a splice from pipe to file.
  */
 static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
-                           size_t len, unsigned int flags)
+                           loff_t *ppos, size_t len, unsigned int flags)
 {
-        loff_t pos;
         int ret;
 
         if (unlikely(!out->f_op || !out->f_op->splice_write))
@@ -737,22 +743,21 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
         if (unlikely(!(out->f_mode & FMODE_WRITE)))
                 return -EBADF;
 
-        pos = out->f_pos;
-
-        ret = rw_verify_area(WRITE, out, &pos, len);
+        ret = rw_verify_area(WRITE, out, ppos, len);
         if (unlikely(ret < 0))
                 return ret;
 
-        return out->f_op->splice_write(pipe, out, len, flags);
+        return out->f_op->splice_write(pipe, out, ppos, len, flags);
 }
 
 /*
  * Attempt to initiate a splice from a file to a pipe.
  */
-static long do_splice_to(struct file *in, struct pipe_inode_info *pipe,
-                         size_t len, unsigned int flags)
+static long do_splice_to(struct file *in, loff_t *ppos,
+                         struct pipe_inode_info *pipe, size_t len,
+                         unsigned int flags)
 {
-        loff_t pos, isize, left;
+        loff_t isize, left;
         int ret;
 
         if (unlikely(!in->f_op || !in->f_op->splice_read))
@@ -761,28 +766,27 @@ static long do_splice_to(struct file *in, struct pipe_inode_info *pipe,
         if (unlikely(!(in->f_mode & FMODE_READ)))
                 return -EBADF;
 
-        pos = in->f_pos;
-
-        ret = rw_verify_area(READ, in, &pos, len);
+        ret = rw_verify_area(READ, in, ppos, len);
         if (unlikely(ret < 0))
                 return ret;
 
         isize = i_size_read(in->f_mapping->host);
-        if (unlikely(in->f_pos >= isize))
+        if (unlikely(*ppos >= isize))
                 return 0;
         
-        left = isize - in->f_pos;
+        left = isize - *ppos;
         if (unlikely(left < len))
                 len = left;
 
-        return in->f_op->splice_read(in, pipe, len, flags);
+        return in->f_op->splice_read(in, ppos, pipe, len, flags);
 }
 
-long do_splice_direct(struct file *in, struct file *out, size_t len,
-                      unsigned int flags)
+long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
+                      size_t len, unsigned int flags)
 {
         struct pipe_inode_info *pipe;
         long ret, bytes;
+        loff_t out_off;
         umode_t i_mode;
         int i;
 
@@ -820,6 +824,7 @@ long do_splice_direct(struct file *in, struct file *out, size_t len,
          */
         ret = 0;
         bytes = 0;
+        out_off = 0;
 
         while (len) {
                 size_t read_len, max_read_len;
@@ -829,7 +834,7 @@ long do_splice_direct(struct file *in, struct file *out, size_t len,
                  */
                 max_read_len = min(len, (size_t)(PIPE_BUFFERS*PAGE_SIZE));
 
-                ret = do_splice_to(in, pipe, max_read_len, flags);
+                ret = do_splice_to(in, ppos, pipe, max_read_len, flags);
                 if (unlikely(ret < 0))
                         goto out_release;
 
@@ -840,7 +845,7 @@ long do_splice_direct(struct file *in, struct file *out, size_t len,
                  * must not do the output in nonblocking mode as then we
                  * could get stuck data in the internal pipe:
                  */
-                ret = do_splice_from(pipe, out, read_len,
+                ret = do_splice_from(pipe, out, &out_off, read_len,
                                      flags & ~SPLICE_F_NONBLOCK);
                 if (unlikely(ret < 0))
                         goto out_release;
@@ -898,6 +903,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
                       size_t len, unsigned int flags)
 {
         struct pipe_inode_info *pipe;
+        loff_t offset, *off;
 
         pipe = in->f_dentry->d_inode->i_pipe;
         if (pipe) {
@@ -906,12 +912,13 @@ static long do_splice(struct file *in, loff_t __user *off_in,
                 if (off_out) {
                         if (out->f_op->llseek == no_llseek)
                                 return -EINVAL;
-                        if (copy_from_user(&out->f_pos, off_out,
-                                           sizeof(loff_t)))
+                        if (copy_from_user(&offset, off_out, sizeof(loff_t)))
                                 return -EFAULT;
-                }
+                        off = &offset;
+                } else
+                        off = &out->f_pos;
 
-                return do_splice_from(pipe, out, len, flags);
+                return do_splice_from(pipe, out, off, len, flags);
         }
 
         pipe = out->f_dentry->d_inode->i_pipe;
@@ -921,11 +928,13 @@ static long do_splice(struct file *in, loff_t __user *off_in,
                 if (off_in) {
                         if (in->f_op->llseek == no_llseek)
                                 return -EINVAL;
-                        if (copy_from_user(&in->f_pos, off_in, sizeof(loff_t)))
+                        if (copy_from_user(&offset, off_in, sizeof(loff_t)))
                                 return -EFAULT;
-                }
+                        off = &offset;
+                } else
+                        off = &in->f_pos;
 
-                return do_splice_to(in, pipe, len, flags);
+                return do_splice_to(in, off, pipe, len, flags);
         }
 
         return -EINVAL;
@@ -961,3 +970,182 @@ asmlinkage long sys_splice(int fd_in, loff_t __user *off_in,
 
         return error;
 }
+
+/*
+ * Link contents of ipipe to opipe.
+ */
+static int link_pipe(struct pipe_inode_info *ipipe,
+                     struct pipe_inode_info *opipe,
+                     size_t len, unsigned int flags)
+{
+        struct pipe_buffer *ibuf, *obuf;
+        int ret = 0, do_wakeup = 0, i;
+
+        /*
+         * Potential ABBA deadlock, work around it by ordering lock
+         * grabbing by inode address. Otherwise two different processes
+         * could deadlock (one doing tee from A -> B, the other from B -> A).
+         */
+        if (ipipe->inode < opipe->inode) {
+                mutex_lock(&ipipe->inode->i_mutex);
+                mutex_lock(&opipe->inode->i_mutex);
+        } else {
+                mutex_lock(&opipe->inode->i_mutex);
+                mutex_lock(&ipipe->inode->i_mutex);
+        }
+
+        for (i = 0;; i++) {
+                if (!opipe->readers) {
+                        send_sig(SIGPIPE, current, 0);
+                        if (!ret)
+                                ret = -EPIPE;
+                        break;
+                }
+                if (ipipe->nrbufs - i) {
+                        ibuf = ipipe->bufs + ((ipipe->curbuf + i) & (PIPE_BUFFERS - 1));
+
+                        /*
+                         * If we have room, fill this buffer
+                         */
+                        if (opipe->nrbufs < PIPE_BUFFERS) {
+                                int nbuf = (opipe->curbuf + opipe->nrbufs) & (PIPE_BUFFERS - 1);
+
+                                /*
+                                 * Get a reference to this pipe buffer,
+                                 * so we can copy the contents over.
+                                 */
+                                ibuf->ops->get(ipipe, ibuf);
+
+                                obuf = opipe->bufs + nbuf;
+                                *obuf = *ibuf;
+
+                                if (obuf->len > len)
+                                        obuf->len = len;
+
+                                opipe->nrbufs++;
+                                do_wakeup = 1;
+                                ret += obuf->len;
+                                len -= obuf->len;
+
+                                if (!len)
+                                        break;
+                                if (opipe->nrbufs < PIPE_BUFFERS)
+                                        continue;
+                        }
+
+                        /*
+                         * We have input available, but no output room.
+                         * If we already copied data, return that.
+                         */
+                        if (flags & SPLICE_F_NONBLOCK) {
+                                if (!ret)
+                                        ret = -EAGAIN;
+                                break;
+                        }
+                        if (signal_pending(current)) {
+                                if (!ret)
+                                        ret = -ERESTARTSYS;
+                                break;
+                        }
+                        if (do_wakeup) {
+                                smp_mb();
+                                if (waitqueue_active(&opipe->wait))
+                                        wake_up_interruptible(&opipe->wait);
+                                kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
+                                do_wakeup = 0;
+                        }
+
+                        opipe->waiting_writers++;
+                        pipe_wait(opipe);
+                        opipe->waiting_writers--;
+                        continue;
+                }
+
+                /*
+                 * No input buffers, do the usual checks for available
+                 * writers and blocking and wait if necessary
+                 */
+                if (!ipipe->writers)
+                        break;
+                if (!ipipe->waiting_writers) {
+                        if (ret)
+                                break;
+                }
+                if (flags & SPLICE_F_NONBLOCK) {
+                        if (!ret)
+                                ret = -EAGAIN;
+                        break;
+                }
+                if (signal_pending(current)) {
+                        if (!ret)
+                                ret = -ERESTARTSYS;
+                        break;
+                }
+
+                if (waitqueue_active(&ipipe->wait))
+                        wake_up_interruptible_sync(&ipipe->wait);
+                kill_fasync(&ipipe->fasync_writers, SIGIO, POLL_OUT);
+
+                pipe_wait(ipipe);
+        }
+
+        mutex_unlock(&ipipe->inode->i_mutex);
+        mutex_unlock(&opipe->inode->i_mutex);
+
+        if (do_wakeup) {
+                smp_mb();
+                if (waitqueue_active(&opipe->wait))
+                        wake_up_interruptible(&opipe->wait);
+                kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
+        }
+
+        return ret;
+}
+
+/*
+ * This is a tee(1) implementation that works on pipes. It doesn't copy
+ * any data, it simply references the 'in' pages on the 'out' pipe.
+ * The 'flags' used are the SPLICE_F_* variants, currently the only
+ * applicable one is SPLICE_F_NONBLOCK.
+ */
+static long do_tee(struct file *in, struct file *out, size_t len,
+                   unsigned int flags)
+{
+        struct pipe_inode_info *ipipe = in->f_dentry->d_inode->i_pipe;
+        struct pipe_inode_info *opipe = out->f_dentry->d_inode->i_pipe;
+
+        /*
+         * Link ipipe to the two output pipes, consuming as we go along.
+         */
+        if (ipipe && opipe)
+                return link_pipe(ipipe, opipe, len, flags);
+
+        return -EINVAL;
+}
+
+asmlinkage long sys_tee(int fdin, int fdout, size_t len, unsigned int flags)
+{
+        struct file *in;
+        int error, fput_in;
+
+        if (unlikely(!len))
+                return 0;
+
+        error = -EBADF;
+        in = fget_light(fdin, &fput_in);
+        if (in) {
+                if (in->f_mode & FMODE_READ) {
+                        int fput_out;
+                        struct file *out = fget_light(fdout, &fput_out);
+
+                        if (out) {
+                                if (out->f_mode & FMODE_WRITE)
+                                        error = do_tee(in, out, len, flags);
+                                fput_light(out, fput_out);
+                        }
+                }
+                fput_light(in, fput_in);
+        }
+
+        return error;
+}
diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index 269721af02f3..c847416f6d10 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -252,6 +252,7 @@ xfs_file_sendfile_invis(
 STATIC ssize_t
 xfs_file_splice_read(
         struct file             *infilp,
+        loff_t                  *ppos,
         struct pipe_inode_info  *pipe,
         size_t                  len,
         unsigned int            flags)
@@ -259,13 +260,14 @@ xfs_file_splice_read(
         vnode_t                 *vp = vn_from_inode(infilp->f_dentry->d_inode);
         ssize_t                 rval;
 
-        VOP_SPLICE_READ(vp, infilp, pipe, len, flags, 0, NULL, rval);
+        VOP_SPLICE_READ(vp, infilp, ppos, pipe, len, flags, 0, NULL, rval);
         return rval;
 }
 
 STATIC ssize_t
 xfs_file_splice_read_invis(
         struct file             *infilp,
+        loff_t                  *ppos,
         struct pipe_inode_info  *pipe,
         size_t                  len,
         unsigned int            flags)
@@ -273,7 +275,7 @@ xfs_file_splice_read_invis(
         vnode_t                 *vp = vn_from_inode(infilp->f_dentry->d_inode);
         ssize_t                 rval;
 
-        VOP_SPLICE_READ(vp, infilp, pipe, len, flags, IO_INVIS, NULL, rval);
+        VOP_SPLICE_READ(vp, infilp, ppos, pipe, len, flags, IO_INVIS, NULL, rval);
         return rval;
 }
 
@@ -281,13 +283,14 @@ STATIC ssize_t
 xfs_file_splice_write(
         struct pipe_inode_info  *pipe,
         struct file             *outfilp,
+        loff_t                  *ppos,
         size_t                  len,
         unsigned int            flags)
 {
         vnode_t                 *vp = vn_from_inode(outfilp->f_dentry->d_inode);
         ssize_t                 rval;
 
-        VOP_SPLICE_WRITE(vp, pipe, outfilp, len, flags, 0, NULL, rval);
+        VOP_SPLICE_WRITE(vp, pipe, outfilp, ppos, len, flags, 0, NULL, rval);
         return rval;
 }
 
@@ -295,13 +298,14 @@ STATIC ssize_t
 xfs_file_splice_write_invis(
         struct pipe_inode_info  *pipe,
         struct file             *outfilp,
+        loff_t                  *ppos,
         size_t                  len,
         unsigned int            flags)
 {
         vnode_t                 *vp = vn_from_inode(outfilp->f_dentry->d_inode);
         ssize_t                 rval;
 
-        VOP_SPLICE_WRITE(vp, pipe, outfilp, len, flags, IO_INVIS, NULL, rval);
+        VOP_SPLICE_WRITE(vp, pipe, outfilp, ppos, len, flags, IO_INVIS, NULL, rval);
         return rval;
 }
 
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 74a52937f208..67efe3308980 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -338,6 +338,7 @@ ssize_t
 xfs_splice_read(
         bhv_desc_t              *bdp,
         struct file             *infilp,
+        loff_t                  *ppos,
         struct pipe_inode_info  *pipe,
         size_t                  count,
         int                     flags,
@@ -360,7 +361,7 @@ xfs_splice_read(
                 int error;
 
                 error = XFS_SEND_DATA(mp, DM_EVENT_READ, BHV_TO_VNODE(bdp),
-                                        infilp->f_pos, count,
+                                        *ppos, count,
                                         FILP_DELAY_FLAG(infilp), &locktype);
                 if (error) {
                         xfs_iunlock(ip, XFS_IOLOCK_SHARED);
@@ -368,8 +369,8 @@ xfs_splice_read(
                 }
         }
         xfs_rw_enter_trace(XFS_SPLICE_READ_ENTER, &ip->i_iocore,
-                           pipe, count, infilp->f_pos, ioflags);
-        ret = generic_file_splice_read(infilp, pipe, count, flags);
+                           pipe, count, *ppos, ioflags);
+        ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
         if (ret > 0)
                 XFS_STATS_ADD(xs_read_bytes, ret);
 
@@ -382,6 +383,7 @@ xfs_splice_write(
         bhv_desc_t              *bdp,
         struct pipe_inode_info  *pipe,
         struct file             *outfilp,
+        loff_t                  *ppos,
         size_t                  count,
         int                     flags,
         int                     ioflags,
@@ -403,7 +405,7 @@ xfs_splice_write(
                 int error;
 
                 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, BHV_TO_VNODE(bdp),
-                                        outfilp->f_pos, count,
+                                        *ppos, count,
                                         FILP_DELAY_FLAG(outfilp), &locktype);
                 if (error) {
                         xfs_iunlock(ip, XFS_IOLOCK_EXCL);
@@ -411,8 +413,8 @@ xfs_splice_write(
                 }
         }
         xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, &ip->i_iocore,
-                           pipe, count, outfilp->f_pos, ioflags);
-        ret = generic_file_splice_write(pipe, outfilp, count, flags);
+                           pipe, count, *ppos, ioflags);
+        ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
         if (ret > 0)
                 XFS_STATS_ADD(xs_write_bytes, ret);
 
diff --git a/fs/xfs/linux-2.6/xfs_lrw.h b/fs/xfs/linux-2.6/xfs_lrw.h
index 55c689a86ad2..8f4539952350 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.h
+++ b/fs/xfs/linux-2.6/xfs_lrw.h
@@ -93,11 +93,11 @@ extern ssize_t xfs_write(struct bhv_desc *, struct kiocb *,
 extern ssize_t xfs_sendfile(struct bhv_desc *, struct file *,
                                 loff_t *, int, size_t, read_actor_t,
                                 void *, struct cred *);
-extern ssize_t xfs_splice_read(struct bhv_desc *, struct file *,
+extern ssize_t xfs_splice_read(struct bhv_desc *, struct file *, loff_t *,
                                 struct pipe_inode_info *, size_t, int, int,
                                 struct cred *);
 extern ssize_t xfs_splice_write(struct bhv_desc *, struct pipe_inode_info *,
-                                struct file *, size_t, int, int,
+                                struct file *, loff_t *, size_t, int, int,
                                 struct cred *);
 
 #endif  /* __XFS_LRW_H__ */
diff --git a/fs/xfs/linux-2.6/xfs_vnode.h b/fs/xfs/linux-2.6/xfs_vnode.h
index 88b09f186289..2a8e16c22353 100644
--- a/fs/xfs/linux-2.6/xfs_vnode.h
+++ b/fs/xfs/linux-2.6/xfs_vnode.h
@@ -173,11 +173,11 @@ typedef ssize_t (*vop_write_t)(bhv_desc_t *, struct kiocb *,
 typedef ssize_t (*vop_sendfile_t)(bhv_desc_t *, struct file *,
                                 loff_t *, int, size_t, read_actor_t,
                                 void *, struct cred *);
-typedef ssize_t (*vop_splice_read_t)(bhv_desc_t *, struct file *,
+typedef ssize_t (*vop_splice_read_t)(bhv_desc_t *, struct file *, loff_t *,
                                 struct pipe_inode_info *, size_t, int, int,
                                 struct cred *);
 typedef ssize_t (*vop_splice_write_t)(bhv_desc_t *, struct pipe_inode_info *,
-                                struct file *, size_t, int, int,
+                                struct file *, loff_t *, size_t, int, int,
                                 struct cred *);
 typedef int     (*vop_ioctl_t)(bhv_desc_t *, struct inode *, struct file *,
                                 int, unsigned int, void __user *);
@@ -284,10 +284,10 @@ typedef struct vnodeops {
         rv = _VOP_(vop_write, vp)((vp)->v_fbhv,file,iov,segs,offset,ioflags,cr)
 #define VOP_SENDFILE(vp,f,off,ioflags,cnt,act,targ,cr,rv)               \
         rv = _VOP_(vop_sendfile, vp)((vp)->v_fbhv,f,off,ioflags,cnt,act,targ,cr)
-#define VOP_SPLICE_READ(vp,f,pipe,cnt,fl,iofl,cr,rv)                    \
-        rv = _VOP_(vop_splice_read, vp)((vp)->v_fbhv,f,pipe,cnt,fl,iofl,cr)
-#define VOP_SPLICE_WRITE(vp,f,pipe,cnt,fl,iofl,cr,rv)                   \
-        rv = _VOP_(vop_splice_write, vp)((vp)->v_fbhv,f,pipe,cnt,fl,iofl,cr)
+#define VOP_SPLICE_READ(vp,f,o,pipe,cnt,fl,iofl,cr,rv)                  \
+        rv = _VOP_(vop_splice_read, vp)((vp)->v_fbhv,f,o,pipe,cnt,fl,iofl,cr)
+#define VOP_SPLICE_WRITE(vp,f,o,pipe,cnt,fl,iofl,cr,rv)                 \
+        rv = _VOP_(vop_splice_write, vp)((vp)->v_fbhv,f,o,pipe,cnt,fl,iofl,cr)
 #define VOP_BMAP(vp,of,sz,rw,b,n,rv)                                    \
         rv = _VOP_(vop_bmap, vp)((vp)->v_fbhv,of,sz,rw,b,n)
 #define VOP_OPEN(vp, cr, rv)                                            \
diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h
index 6a8dd83c350f..d81d6cfc1bb4 100644
--- a/include/asm-i386/unistd.h
+++ b/include/asm-i386/unistd.h
@@ -320,8 +320,9 @@
 #define __NR_get_robust_list    312
 #define __NR_splice             313
 #define __NR_sync_file_range    314
+#define __NR_tee                315
 
-#define NR_syscalls 315
+#define NR_syscalls 316
 
 /*
  * user-visible error numbers are in the range -1 - -128: see
diff --git a/include/asm-ia64/unistd.h b/include/asm-ia64/unistd.h
index 1c749acca021..a40ebec6aeeb 100644
--- a/include/asm-ia64/unistd.h
+++ b/include/asm-ia64/unistd.h
@@ -289,12 +289,13 @@
 #define __NR_set_robust_list            1298
 #define __NR_get_robust_list            1299
 #define __NR_sync_file_range            1300
+#define __NR_tee                        1301
 
 #ifdef __KERNEL__
 
 #include <linux/config.h>
 
-#define NR_syscalls                     277 /* length of syscall table */
+#define NR_syscalls                     278 /* length of syscall table */
 
 #define __ARCH_WANT_SYS_RT_SIGACTION
 
diff --git a/include/asm-powerpc/unistd.h b/include/asm-powerpc/unistd.h
index 536ba0873052..c612f1a62772 100644
--- a/include/asm-powerpc/unistd.h
+++ b/include/asm-powerpc/unistd.h
@@ -302,8 +302,9 @@
 #define __NR_ppoll              281
 #define __NR_unshare            282
 #define __NR_splice             283
+#define __NR_tee                284
 
-#define __NR_syscalls           284
+#define __NR_syscalls           285
 
 #ifdef __KERNEL__
 #define __NR__exit __NR_exit
diff --git a/include/asm-x86_64/unistd.h b/include/asm-x86_64/unistd.h
index f21ff2c1e960..d86494e23b63 100644
--- a/include/asm-x86_64/unistd.h
+++ b/include/asm-x86_64/unistd.h
@@ -611,8 +611,10 @@ __SYSCALL(__NR_set_robust_list, sys_set_robust_list)
 __SYSCALL(__NR_get_robust_list, sys_get_robust_list)
 #define __NR_splice             275
 __SYSCALL(__NR_splice, sys_splice)
+#define __NR_tee                276
+__SYSCALL(__NR_tee, sys_tee)
 
-#define __NR_syscall_max __NR_splice
+#define __NR_syscall_max __NR_tee
 
 #ifndef __NO_STUBS
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 162c6e57307a..3de2bfb2410f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1039,8 +1039,8 @@ struct file_operations {
         int (*check_flags)(int);
         int (*dir_notify)(struct file *filp, unsigned long arg);
         int (*flock) (struct file *, int, struct file_lock *);
-        ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, size_t, unsigned int);
-        ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
+        ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
+        ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
 };
 
 struct inode_operations {
@@ -1613,13 +1613,13 @@ extern void do_generic_mapping_read(struct address_space *mapping,
                                     loff_t *, read_descriptor_t *, read_actor_t);
 
 /* fs/splice.c */
-extern ssize_t generic_file_splice_read(struct file *,
+extern ssize_t generic_file_splice_read(struct file *, loff_t *,
                 struct pipe_inode_info *, size_t, unsigned int);
 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
-                struct file *, size_t, unsigned int);
+                struct file *, loff_t *, size_t, unsigned int);
 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
-                struct file *out, size_t len, unsigned int flags);
-extern long do_splice_direct(struct file *in, struct file *out,
+                struct file *out, loff_t *, size_t len, unsigned int flags);
+extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
                 size_t len, unsigned int flags);
 
 extern void
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 123a7c24bc72..ef7f33c0be19 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -21,6 +21,7 @@ struct pipe_buf_operations {
         void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *);
         void (*release)(struct pipe_inode_info *, struct pipe_buffer *);
         int (*steal)(struct pipe_inode_info *, struct pipe_buffer *);
+        void (*get)(struct pipe_inode_info *, struct pipe_buffer *);
 };
 
 struct pipe_inode_info {
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index f001bad28d9a..d3ebc0e68b2b 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -574,6 +574,8 @@ asmlinkage long sys_splice(int fd_in, loff_t __user *off_in,
                            int fd_out, loff_t __user *off_out,
                            size_t len, unsigned int flags);
 
+asmlinkage long sys_tee(int fdin, int fdout, size_t len, unsigned int flags);
+
 asmlinkage long sys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
                                         unsigned int flags);