#include <linux/mm_inline.h>
#include <linux/swap.h>
#include <linux/writeback.h>
-#include <linux/buffer_head.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/syscalls.h>
#include <linux/uio.h>
#include <linux/security.h>
+#include <linux/gfp.h>
+#include <linux/socket.h>
+#include <linux/compat.h>
+#include "internal.h"
/*
* Attempt to steal a page from a pipe buffer. This should perhaps go into
return err;
}
-static const struct pipe_buf_operations page_cache_pipe_buf_ops = {
+const struct pipe_buf_operations page_cache_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.get = generic_pipe_buf_get,
};
+static void wakeup_pipe_readers(struct pipe_inode_info *pipe)
+{
+ smp_mb();
+ if (waitqueue_active(&pipe->wait))
+ wake_up_interruptible(&pipe->wait);
+ kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
+}
+
/**
* splice_to_pipe - fill passed data into a pipe
* @pipe: pipe to fill
break;
}
- if (pipe->nrbufs < PIPE_BUFFERS) {
- int newbuf = (pipe->curbuf + pipe->nrbufs) & (PIPE_BUFFERS - 1);
+ if (pipe->nrbufs < pipe->buffers) {
+ int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1);
struct pipe_buffer *buf = pipe->bufs + newbuf;
buf->page = spd->pages[page_nr];
page_nr++;
ret += buf->len;
- if (pipe->inode)
+ if (pipe->files)
do_wakeup = 1;
if (!--spd->nr_pages)
break;
- if (pipe->nrbufs < PIPE_BUFFERS)
+ if (pipe->nrbufs < pipe->buffers)
continue;
break;
pipe_unlock(pipe);
- if (do_wakeup) {
- smp_mb();
- if (waitqueue_active(&pipe->wait))
- wake_up_interruptible(&pipe->wait);
- kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
- }
+ if (do_wakeup)
+ wakeup_pipe_readers(pipe);
while (page_nr < spd_pages)
spd->spd_release(spd, page_nr++);
return ret;
}
-static void spd_release_page(struct splice_pipe_desc *spd, unsigned int i)
+void spd_release_page(struct splice_pipe_desc *spd, unsigned int i)
{
page_cache_release(spd->pages[i]);
}
+/*
+ * Check if we need to grow the arrays holding pages and partial page
+ * descriptions.
+ */
+int splice_grow_spd(const struct pipe_inode_info *pipe, struct splice_pipe_desc *spd)
+{
+ unsigned int buffers = ACCESS_ONCE(pipe->buffers);
+
+ spd->nr_pages_max = buffers;
+ if (buffers <= PIPE_DEF_BUFFERS)
+ return 0;
+
+ spd->pages = kmalloc(buffers * sizeof(struct page *), GFP_KERNEL);
+ spd->partial = kmalloc(buffers * sizeof(struct partial_page), GFP_KERNEL);
+
+ if (spd->pages && spd->partial)
+ return 0;
+
+ kfree(spd->pages);
+ kfree(spd->partial);
+ return -ENOMEM;
+}
+
+void splice_shrink_spd(struct splice_pipe_desc *spd)
+{
+ if (spd->nr_pages_max <= PIPE_DEF_BUFFERS)
+ return;
+
+ kfree(spd->pages);
+ kfree(spd->partial);
+}
+
static int
__generic_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
{
struct address_space *mapping = in->f_mapping;
unsigned int loff, nr_pages, req_pages;
- struct page *pages[PIPE_BUFFERS];
- struct partial_page partial[PIPE_BUFFERS];
+ struct page *pages[PIPE_DEF_BUFFERS];
+ struct partial_page partial[PIPE_DEF_BUFFERS];
struct page *page;
pgoff_t index, end_index;
loff_t isize;
struct splice_pipe_desc spd = {
.pages = pages,
.partial = partial,
+ .nr_pages_max = PIPE_DEF_BUFFERS,
.flags = flags,
.ops = &page_cache_pipe_buf_ops,
.spd_release = spd_release_page,
};
+ if (splice_grow_spd(pipe, &spd))
+ return -ENOMEM;
+
index = *ppos >> PAGE_CACHE_SHIFT;
loff = *ppos & ~PAGE_CACHE_MASK;
req_pages = (len + loff + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
- nr_pages = min(req_pages, (unsigned)PIPE_BUFFERS);
+ nr_pages = min(req_pages, spd.nr_pages_max);
/*
* Lookup the (hopefully) full range of pages we need.
*/
- spd.nr_pages = find_get_pages_contig(mapping, index, nr_pages, pages);
+ spd.nr_pages = find_get_pages_contig(mapping, index, nr_pages, spd.pages);
index += spd.nr_pages;
/*
break;
error = add_to_page_cache_lru(page, mapping, index,
- mapping_gfp_mask(mapping));
+ GFP_KERNEL);
if (unlikely(error)) {
page_cache_release(page);
if (error == -EEXIST)
unlock_page(page);
}
- pages[spd.nr_pages++] = page;
+ spd.pages[spd.nr_pages++] = page;
index++;
}
* this_len is the max we'll use from this page
*/
this_len = min_t(unsigned long, len, PAGE_CACHE_SIZE - loff);
- page = pages[page_nr];
+ page = spd.pages[page_nr];
if (PageReadahead(page))
page_cache_async_readahead(mapping, &in->f_ra, in,
* If the page isn't uptodate, we may need to start io on it
*/
if (!PageUptodate(page)) {
- /*
- * If in nonblock mode then dont block on waiting
- * for an in-flight io page
- */
- if (flags & SPLICE_F_NONBLOCK) {
- if (!trylock_page(page)) {
- error = -EAGAIN;
- break;
- }
- } else
- lock_page(page);
+ lock_page(page);
/*
* Page was truncated, or invalidated by the
error = -ENOMEM;
break;
}
- page_cache_release(pages[page_nr]);
- pages[page_nr] = page;
+ page_cache_release(spd.pages[page_nr]);
+ spd.pages[page_nr] = page;
}
/*
* page was already under io and is now done, great
len = this_len;
}
- partial[page_nr].offset = loff;
- partial[page_nr].len = this_len;
+ spd.partial[page_nr].offset = loff;
+ spd.partial[page_nr].len = this_len;
len -= this_len;
loff = 0;
spd.nr_pages++;
* we got, 'nr_pages' is how many pages are in the map.
*/
while (page_nr < nr_pages)
- page_cache_release(pages[page_nr++]);
+ page_cache_release(spd.pages[page_nr++]);
in->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
if (spd.nr_pages)
- return splice_to_pipe(pipe, &spd);
+ error = splice_to_pipe(pipe, &spd);
+ splice_shrink_spd(&spd);
return error;
}
len = left;
ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
- if (ret > 0)
+ if (ret > 0) {
*ppos += ret;
+ file_accessed(in);
+ }
return ret;
}
.get = generic_pipe_buf_get,
};
+static int generic_pipe_buf_nosteal(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
+{
+ return 1;
+}
+
+/* Pipe buffer operations for a socket and similar. */
+const struct pipe_buf_operations nosteal_pipe_buf_ops = {
+ .can_merge = 0,
+ .map = generic_pipe_buf_map,
+ .unmap = generic_pipe_buf_unmap,
+ .confirm = generic_pipe_buf_confirm,
+ .release = generic_pipe_buf_release,
+ .steal = generic_pipe_buf_nosteal,
+ .get = generic_pipe_buf_get,
+};
+EXPORT_SYMBOL(nosteal_pipe_buf_ops);
+
static ssize_t kernel_readv(struct file *file, const struct iovec *vec,
unsigned long vlen, loff_t offset)
{
return res;
}
-static ssize_t kernel_write(struct file *file, const char *buf, size_t count,
+ssize_t kernel_write(struct file *file, const char *buf, size_t count,
loff_t pos)
{
mm_segment_t old_fs;
old_fs = get_fs();
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
- res = vfs_write(file, (const char __user *)buf, count, &pos);
+ res = vfs_write(file, (__force const char __user *)buf, count, &pos);
set_fs(old_fs);
return res;
}
+EXPORT_SYMBOL(kernel_write);
ssize_t default_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int nr_pages;
unsigned int nr_freed;
size_t offset;
- struct page *pages[PIPE_BUFFERS];
- struct partial_page partial[PIPE_BUFFERS];
- struct iovec vec[PIPE_BUFFERS];
- pgoff_t index;
+ struct page *pages[PIPE_DEF_BUFFERS];
+ struct partial_page partial[PIPE_DEF_BUFFERS];
+ struct iovec *vec, __vec[PIPE_DEF_BUFFERS];
ssize_t res;
size_t this_len;
int error;
struct splice_pipe_desc spd = {
.pages = pages,
.partial = partial,
+ .nr_pages_max = PIPE_DEF_BUFFERS,
.flags = flags,
.ops = &default_pipe_buf_ops,
.spd_release = spd_release_page,
};
- index = *ppos >> PAGE_CACHE_SHIFT;
+ if (splice_grow_spd(pipe, &spd))
+ return -ENOMEM;
+
+ res = -ENOMEM;
+ vec = __vec;
+ if (spd.nr_pages_max > PIPE_DEF_BUFFERS) {
+ vec = kmalloc(spd.nr_pages_max * sizeof(struct iovec), GFP_KERNEL);
+ if (!vec)
+ goto shrink_ret;
+ }
+
offset = *ppos & ~PAGE_CACHE_MASK;
nr_pages = (len + offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
- for (i = 0; i < nr_pages && i < PIPE_BUFFERS && len; i++) {
+ for (i = 0; i < nr_pages && i < spd.nr_pages_max && len; i++) {
struct page *page;
page = alloc_page(GFP_USER);
this_len = min_t(size_t, len, PAGE_CACHE_SIZE - offset);
vec[i].iov_base = (void __user *) page_address(page);
vec[i].iov_len = this_len;
- pages[i] = page;
+ spd.pages[i] = page;
spd.nr_pages++;
len -= this_len;
offset = 0;
nr_freed = 0;
for (i = 0; i < spd.nr_pages; i++) {
this_len = min_t(size_t, vec[i].iov_len, res);
- partial[i].offset = 0;
- partial[i].len = this_len;
+ spd.partial[i].offset = 0;
+ spd.partial[i].len = this_len;
if (!this_len) {
- __free_page(pages[i]);
- pages[i] = NULL;
+ __free_page(spd.pages[i]);
+ spd.pages[i] = NULL;
nr_freed++;
}
res -= this_len;
if (res > 0)
*ppos += res;
+shrink_ret:
+ if (vec != __vec)
+ kfree(vec);
+ splice_shrink_spd(&spd);
return res;
err:
for (i = 0; i < spd.nr_pages; i++)
- __free_page(pages[i]);
+ __free_page(spd.pages[i]);
- return error;
+ res = error;
+ goto shrink_ret;
}
EXPORT_SYMBOL(default_file_splice_read);
{
struct file *file = sd->u.file;
loff_t pos = sd->pos;
- int ret, more;
+ int more;
- ret = buf->ops->confirm(pipe, buf);
- if (!ret) {
- more = (sd->flags & SPLICE_F_MORE) || sd->len < sd->total_len;
+ if (!likely(file->f_op && file->f_op->sendpage))
+ return -EINVAL;
- ret = file->f_op->sendpage(file, buf->page, buf->offset,
- sd->len, &pos, more);
- }
+ more = (sd->flags & SPLICE_F_MORE) ? MSG_MORE : 0;
- return ret;
+ if (sd->len < sd->total_len && pipe->nrbufs > 1)
+ more |= MSG_SENDPAGE_NOTLAST;
+
+ return file->f_op->sendpage(file, buf->page, buf->offset,
+ sd->len, &pos, more);
}
/*
void *fsdata;
int ret;
- /*
- * make sure the data in this buffer is uptodate
- */
- ret = buf->ops->confirm(pipe, buf);
- if (unlikely(ret))
- return ret;
-
offset = sd->pos & ~PAGE_CACHE_MASK;
this_len = sd->len;
goto out;
if (buf->page != page) {
- /*
- * Careful, ->map() uses KM_USER0!
- */
char *src = buf->ops->map(pipe, buf, 1);
- char *dst = kmap_atomic(page, KM_USER1);
+ char *dst = kmap_atomic(page);
memcpy(dst + offset, src + buf->offset, this_len);
flush_dcache_page(page);
- kunmap_atomic(dst, KM_USER1);
+ kunmap_atomic(dst);
buf->ops->unmap(pipe, buf, src);
}
ret = pagecache_write_end(file, mapping, sd->pos, this_len, this_len,
if (sd->len > sd->total_len)
sd->len = sd->total_len;
- ret = actor(pipe, buf, sd);
- if (ret <= 0) {
+ ret = buf->ops->confirm(pipe, buf);
+ if (unlikely(ret)) {
if (ret == -ENODATA)
ret = 0;
return ret;
}
+
+ ret = actor(pipe, buf, sd);
+ if (ret <= 0)
+ return ret;
+
buf->offset += ret;
buf->len -= ret;
if (!buf->len) {
buf->ops = NULL;
ops->release(pipe, buf);
- pipe->curbuf = (pipe->curbuf + 1) & (PIPE_BUFFERS - 1);
+ pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1);
pipe->nrbufs--;
- if (pipe->inode)
+ if (pipe->files)
sd->need_wakeup = true;
}
struct address_space *mapping = out->f_mapping;
struct inode *inode = mapping->host;
struct splice_desc sd = {
- .total_len = len,
.flags = flags,
- .pos = *ppos,
.u.file = out,
};
ssize_t ret;
+ ret = generic_write_checks(out, ppos, &len, S_ISBLK(inode->i_mode));
+ if (ret)
+ return ret;
+ sd.total_len = len;
+ sd.pos = *ppos;
+
pipe_lock(pipe);
splice_from_pipe_begin(&sd);
mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
ret = file_remove_suid(out);
- if (!ret)
- ret = splice_from_pipe_feed(pipe, &sd, pipe_to_file);
+ if (!ret) {
+ ret = file_update_time(out);
+ if (!ret)
+ ret = splice_from_pipe_feed(pipe, &sd,
+ pipe_to_file);
+ }
mutex_unlock(&inode->i_mutex);
} while (ret > 0);
splice_from_pipe_end(pipe, &sd);
ret = sd.num_spliced;
if (ret > 0) {
- unsigned long nr_pages;
-
- *ppos += ret;
- nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-
- /*
- * If file or inode is SYNC and we actually wrote some data,
- * sync it.
- */
- if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
- int err;
-
- mutex_lock(&inode->i_mutex);
- err = generic_osync_inode(inode, mapping,
- OSYNC_METADATA|OSYNC_DATA);
- mutex_unlock(&inode->i_mutex);
-
- if (err)
- ret = err;
- }
- balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
+ int err;
+
+ err = generic_write_sync(out, *ppos, ret);
+ if (err)
+ ret = err;
+ else
+ *ppos += ret;
+ balance_dirty_pages_ratelimited(mapping);
}
return ret;
{
int ret;
void *data;
-
- ret = buf->ops->confirm(pipe, buf);
- if (ret)
- return ret;
+ loff_t tmp = sd->pos;
data = buf->ops->map(pipe, buf, 0);
- ret = kernel_write(sd->u.file, data + buf->offset, sd->len, sd->pos);
+ ret = __kernel_write(sd->u.file, data + buf->offset, sd->len, &tmp);
buf->ops->unmap(pipe, buf, data);
return ret;
if (unlikely(ret < 0))
return ret;
- splice_write = out->f_op->splice_write;
- if (!splice_write)
+ if (out->f_op && out->f_op->splice_write)
+ splice_write = out->f_op->splice_write;
+ else
splice_write = default_file_splice_write;
- return splice_write(pipe, out, ppos, len, flags);
+ file_start_write(out);
+ ret = splice_write(pipe, out, ppos, len, flags);
+ file_end_write(out);
+ return ret;
}
/*
if (unlikely(ret < 0))
return ret;
- splice_read = in->f_op->splice_read;
- if (!splice_read)
+ if (in->f_op && in->f_op->splice_read)
+ splice_read = in->f_op->splice_read;
+ else
splice_read = default_file_splice_read;
return splice_read(in, ppos, pipe, len, flags);
* randomly drop data for eg socket -> socket splicing. Use the
* piped splicing for that!
*/
- i_mode = in->f_path.dentry->d_inode->i_mode;
+ i_mode = file_inode(in)->i_mode;
if (unlikely(!S_ISREG(i_mode) && !S_ISBLK(i_mode)))
return -EINVAL;
*/
pipe = current->splice_pipe;
if (unlikely(!pipe)) {
- pipe = alloc_pipe_info(NULL);
+ pipe = alloc_pipe_info();
if (!pipe)
return -ENOMEM;
* If we did an incomplete transfer we must release
* the pipe buffers in question:
*/
- for (i = 0; i < PIPE_BUFFERS; i++) {
+ for (i = 0; i < pipe->buffers; i++) {
struct pipe_buffer *buf = pipe->bufs + i;
if (buf->ops) {
{
struct file *file = sd->u.file;
- return do_splice_from(pipe, file, &sd->pos, sd->total_len, sd->flags);
+ return do_splice_from(pipe, file, sd->opos, sd->total_len,
+ sd->flags);
}
/**
* @in: file to splice from
* @ppos: input file offset
* @out: file to splice to
+ * @opos: output file offset
* @len: number of bytes to splice
* @flags: splice modifier flags
*
*
*/
long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
- size_t len, unsigned int flags)
+ loff_t *opos, size_t len, unsigned int flags)
{
struct splice_desc sd = {
.len = len,
.flags = flags,
.pos = *ppos,
.u.file = out,
+ .opos = opos,
};
long ret;
static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
struct pipe_inode_info *opipe,
size_t len, unsigned int flags);
-/*
- * After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same
- * location, so checking ->i_pipe is not enough to verify that this is a
- * pipe.
- */
-static inline struct pipe_inode_info *pipe_info(struct inode *inode)
-{
- if (S_ISFIFO(inode->i_mode))
- return inode->i_pipe;
-
- return NULL;
-}
/*
* Determine where to splice to/from.
{
struct pipe_inode_info *ipipe;
struct pipe_inode_info *opipe;
- loff_t offset, *off;
+ loff_t offset;
long ret;
- ipipe = pipe_info(in->f_path.dentry->d_inode);
- opipe = pipe_info(out->f_path.dentry->d_inode);
+ ipipe = get_pipe_info(in);
+ opipe = get_pipe_info(out);
if (ipipe && opipe) {
if (off_in || off_out)
if (off_in)
return -ESPIPE;
if (off_out) {
- if (out->f_op->llseek == no_llseek)
+ if (!(out->f_mode & FMODE_PWRITE))
return -EINVAL;
if (copy_from_user(&offset, off_out, sizeof(loff_t)))
return -EFAULT;
- off = &offset;
- } else
- off = &out->f_pos;
+ } else {
+ offset = out->f_pos;
+ }
- ret = do_splice_from(ipipe, out, off, len, flags);
+ ret = do_splice_from(ipipe, out, &offset, len, flags);
- if (off_out && copy_to_user(off_out, off, sizeof(loff_t)))
+ if (!off_out)
+ out->f_pos = offset;
+ else if (copy_to_user(off_out, &offset, sizeof(loff_t)))
ret = -EFAULT;
return ret;
if (off_out)
return -ESPIPE;
if (off_in) {
- if (in->f_op->llseek == no_llseek)
+ if (!(in->f_mode & FMODE_PREAD))
return -EINVAL;
if (copy_from_user(&offset, off_in, sizeof(loff_t)))
return -EFAULT;
- off = &offset;
- } else
- off = &in->f_pos;
+ } else {
+ offset = in->f_pos;
+ }
- ret = do_splice_to(in, off, opipe, len, flags);
+ ret = do_splice_to(in, &offset, opipe, len, flags);
- if (off_in && copy_to_user(off_in, off, sizeof(loff_t)))
+ if (!off_in)
+ in->f_pos = offset;
+ else if (copy_to_user(off_in, &offset, sizeof(loff_t)))
ret = -EFAULT;
return ret;
*/
static int get_iovec_page_array(const struct iovec __user *iov,
unsigned int nr_vecs, struct page **pages,
- struct partial_page *partial, int aligned)
+ struct partial_page *partial, bool aligned,
+ unsigned int pipe_buffers)
{
int buffers = 0, error = 0;
break;
npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- if (npages > PIPE_BUFFERS - buffers)
- npages = PIPE_BUFFERS - buffers;
+ if (npages > pipe_buffers - buffers)
+ npages = pipe_buffers - buffers;
error = get_user_pages_fast((unsigned long)base, npages,
0, &pages[buffers]);
* or if we mapped the max number of pages that we have
* room for.
*/
- if (error < npages || buffers == PIPE_BUFFERS)
+ if (error < npages || buffers == pipe_buffers)
break;
nr_vecs--;
char *src;
int ret;
- ret = buf->ops->confirm(pipe, buf);
- if (unlikely(ret))
- return ret;
-
/*
* See if we can use the atomic maps, by prefaulting in the
* pages and doing an atomic copy
int error;
long ret;
- pipe = pipe_info(file->f_path.dentry->d_inode);
+ pipe = get_pipe_info(file);
if (!pipe)
return -EBADF;
unsigned long nr_segs, unsigned int flags)
{
struct pipe_inode_info *pipe;
- struct page *pages[PIPE_BUFFERS];
- struct partial_page partial[PIPE_BUFFERS];
+ struct page *pages[PIPE_DEF_BUFFERS];
+ struct partial_page partial[PIPE_DEF_BUFFERS];
struct splice_pipe_desc spd = {
.pages = pages,
.partial = partial,
+ .nr_pages_max = PIPE_DEF_BUFFERS,
.flags = flags,
.ops = &user_page_pipe_buf_ops,
.spd_release = spd_release_page,
};
+ long ret;
- pipe = pipe_info(file->f_path.dentry->d_inode);
+ pipe = get_pipe_info(file);
if (!pipe)
return -EBADF;
- spd.nr_pages = get_iovec_page_array(iov, nr_segs, pages, partial,
- flags & SPLICE_F_GIFT);
+ if (splice_grow_spd(pipe, &spd))
+ return -ENOMEM;
+
+ spd.nr_pages = get_iovec_page_array(iov, nr_segs, spd.pages,
+ spd.partial, false,
+ spd.nr_pages_max);
if (spd.nr_pages <= 0)
- return spd.nr_pages;
+ ret = spd.nr_pages;
+ else
+ ret = splice_to_pipe(pipe, &spd);
- return splice_to_pipe(pipe, &spd);
+ splice_shrink_spd(&spd);
+ return ret;
}
/*
SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
unsigned long, nr_segs, unsigned int, flags)
{
- struct file *file;
+ struct fd f;
long error;
- int fput;
if (unlikely(nr_segs > UIO_MAXIOV))
return -EINVAL;
return 0;
error = -EBADF;
- file = fget_light(fd, &fput);
- if (file) {
- if (file->f_mode & FMODE_WRITE)
- error = vmsplice_to_pipe(file, iov, nr_segs, flags);
- else if (file->f_mode & FMODE_READ)
- error = vmsplice_to_user(file, iov, nr_segs, flags);
-
- fput_light(file, fput);
+ f = fdget(fd);
+ if (f.file) {
+ if (f.file->f_mode & FMODE_WRITE)
+ error = vmsplice_to_pipe(f.file, iov, nr_segs, flags);
+ else if (f.file->f_mode & FMODE_READ)
+ error = vmsplice_to_user(f.file, iov, nr_segs, flags);
+
+ fdput(f);
}
return error;
}
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32,
+ unsigned int, nr_segs, unsigned int, flags)
+{
+ unsigned i;
+ struct iovec __user *iov;
+ if (nr_segs > UIO_MAXIOV)
+ return -EINVAL;
+ iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
+ for (i = 0; i < nr_segs; i++) {
+ struct compat_iovec v;
+ if (get_user(v.iov_base, &iov32[i].iov_base) ||
+ get_user(v.iov_len, &iov32[i].iov_len) ||
+ put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
+ put_user(v.iov_len, &iov[i].iov_len))
+ return -EFAULT;
+ }
+ return sys_vmsplice(fd, iov, nr_segs, flags);
+}
+#endif
+
SYSCALL_DEFINE6(splice, int, fd_in, loff_t __user *, off_in,
int, fd_out, loff_t __user *, off_out,
size_t, len, unsigned int, flags)
{
+ struct fd in, out;
long error;
- struct file *in, *out;
- int fput_in, fput_out;
if (unlikely(!len))
return 0;
error = -EBADF;
- in = fget_light(fd_in, &fput_in);
- if (in) {
- if (in->f_mode & FMODE_READ) {
- out = fget_light(fd_out, &fput_out);
- if (out) {
- if (out->f_mode & FMODE_WRITE)
- error = do_splice(in, off_in,
- out, off_out,
+ in = fdget(fd_in);
+ if (in.file) {
+ if (in.file->f_mode & FMODE_READ) {
+ out = fdget(fd_out);
+ if (out.file) {
+ if (out.file->f_mode & FMODE_WRITE)
+ error = do_splice(in.file, off_in,
+ out.file, off_out,
len, flags);
- fput_light(out, fput_out);
+ fdput(out);
}
}
-
- fput_light(in, fput_in);
+ fdput(in);
}
-
return error;
}
* Check ->nrbufs without the inode lock first. This function
* is speculative anyways, so missing one is ok.
*/
- if (pipe->nrbufs < PIPE_BUFFERS)
+ if (pipe->nrbufs < pipe->buffers)
return 0;
ret = 0;
pipe_lock(pipe);
- while (pipe->nrbufs >= PIPE_BUFFERS) {
+ while (pipe->nrbufs >= pipe->buffers) {
if (!pipe->readers) {
send_sig(SIGPIPE, current, 0);
ret = -EPIPE;
* Cannot make any progress, because either the input
* pipe is empty or the output pipe is full.
*/
- if (!ipipe->nrbufs || opipe->nrbufs >= PIPE_BUFFERS) {
+ if (!ipipe->nrbufs || opipe->nrbufs >= opipe->buffers) {
/* Already processed some buffers, break */
if (ret)
break;
}
ibuf = ipipe->bufs + ipipe->curbuf;
- nbuf = (opipe->curbuf + opipe->nrbufs) % PIPE_BUFFERS;
+ nbuf = (opipe->curbuf + opipe->nrbufs) & (opipe->buffers - 1);
obuf = opipe->bufs + nbuf;
if (len >= ibuf->len) {
*obuf = *ibuf;
ibuf->ops = NULL;
opipe->nrbufs++;
- ipipe->curbuf = (ipipe->curbuf + 1) % PIPE_BUFFERS;
+ ipipe->curbuf = (ipipe->curbuf + 1) & (ipipe->buffers - 1);
ipipe->nrbufs--;
input_wakeup = true;
} else {
/*
* If we put data in the output pipe, wakeup any potential readers.
*/
- if (ret > 0) {
- smp_mb();
- if (waitqueue_active(&opipe->wait))
- wake_up_interruptible(&opipe->wait);
- kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
- }
+ if (ret > 0)
+ wakeup_pipe_readers(opipe);
+
if (input_wakeup)
wakeup_pipe_writers(ipipe);
* If we have iterated all input buffers or ran out of
* output room, break.
*/
- if (i >= ipipe->nrbufs || opipe->nrbufs >= PIPE_BUFFERS)
+ if (i >= ipipe->nrbufs || opipe->nrbufs >= opipe->buffers)
break;
- ibuf = ipipe->bufs + ((ipipe->curbuf + i) & (PIPE_BUFFERS - 1));
- nbuf = (opipe->curbuf + opipe->nrbufs) & (PIPE_BUFFERS - 1);
+ ibuf = ipipe->bufs + ((ipipe->curbuf + i) & (ipipe->buffers-1));
+ nbuf = (opipe->curbuf + opipe->nrbufs) & (opipe->buffers - 1);
/*
* Get a reference to this pipe buffer,
/*
* If we put data in the output pipe, wakeup any potential readers.
*/
- if (ret > 0) {
- smp_mb();
- if (waitqueue_active(&opipe->wait))
- wake_up_interruptible(&opipe->wait);
- kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
- }
+ if (ret > 0)
+ wakeup_pipe_readers(opipe);
return ret;
}
static long do_tee(struct file *in, struct file *out, size_t len,
unsigned int flags)
{
- struct pipe_inode_info *ipipe = pipe_info(in->f_path.dentry->d_inode);
- struct pipe_inode_info *opipe = pipe_info(out->f_path.dentry->d_inode);
+ struct pipe_inode_info *ipipe = get_pipe_info(in);
+ struct pipe_inode_info *opipe = get_pipe_info(out);
int ret = -EINVAL;
/*
SYSCALL_DEFINE4(tee, int, fdin, int, fdout, size_t, len, unsigned int, flags)
{
- struct file *in;
- int error, fput_in;
+ struct fd in;
+ int error;
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);
+ in = fdget(fdin);
+ if (in.file) {
+ if (in.file->f_mode & FMODE_READ) {
+ struct fd out = fdget(fdout);
+ if (out.file) {
+ if (out.file->f_mode & FMODE_WRITE)
+ error = do_tee(in.file, out.file,
+ len, flags);
+ fdput(out);
}
}
- fput_light(in, fput_in);
+ fdput(in);
}
return error;