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Merge branch 'splice-2.6.23' of git://git.kernel.dk/data/git/linux-2.6-block

Browse source 
* 'splice-2.6.23' of git://git.kernel.dk/data/git/linux-2.6-block:
  pipe: add documentation and comments
  pipe: change the ->pin() operation to ->confirm()
  Remove remnants of sendfile()
  xip sendfile removal
  splice: completely document external interface with kerneldoc
  sendfile: remove bad_sendfile() from bad_file_ops
  shmem: convert to using splice instead of sendfile()
  relay: use splice_to_pipe() instead of open-coding the pipe loop
  pipe: allow passing around of ops private pointer
  splice: divorce the splice structure/function definitions from the pipe header
  splice: relay support
  sendfile: convert nfsd to splice_direct_to_actor()
  sendfile: convert nfs to using splice_read()
  loop: convert to using splice_direct_to_actor() instead of sendfile()
  splice: add void cookie to the actor data
  sendfile: kill generic_file_sendfile()
  sendfile: remove .sendfile from filesystems that use generic_file_sendfile()
  sys_sendfile: switch to using ->splice_read, if available
  vmsplice: add vmsplice-to-user support
  splice: abstract out actor data
This commit is contained in:
Linus Torvalds 2007-07-10 13:51:06 -07:00
commit 01370f0603
56 changed files with 873 additions and 458 deletions
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11
Documentation/DocBook/kernel-api.tmpl
View file

@ -643,4 +643,15 @@ X!Idrivers/video/console/fonts.c
!Edrivers/spi/spi.c
</chapter>
<chapter id="splice">
<title>splice API</title>
<para>)
splice is a method for moving blocks of data around inside the
kernel, without continually transferring it between the kernel
and user space.
</para>
!Iinclude/linux/splice.h
!Ffs/splice.c
</chapter>
</book>

64
drivers/block/loop.c
View file

@ -74,6 +74,7 @@
#include <linux/highmem.h>
#include <linux/gfp.h>
#include <linux/kthread.h>
#include <linux/splice.h>
#include <asm/uaccess.h>
@ -401,50 +402,73 @@ struct lo_read_data {
};
static int
lo_read_actor(read_descriptor_t *desc, struct page *page,
unsigned long offset, unsigned long size)
lo_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
struct splice_desc *sd)
{
unsigned long count = desc->count;
struct lo_read_data *p = desc->arg.data;
struct lo_read_data *p = sd->u.data;
struct loop_device *lo = p->lo;
struct page *page = buf->page;
sector_t IV;
size_t size;
int ret;
IV = ((sector_t) page->index << (PAGE_CACHE_SHIFT - 9))+(offset >> 9);
ret = buf->ops->confirm(pipe, buf);
if (unlikely(ret))
return ret;
if (size > count)
size = count;
IV = ((sector_t) page->index << (PAGE_CACHE_SHIFT - 9)) +
(buf->offset >> 9);
size = sd->len;
if (size > p->bsize)
size = p->bsize;
if (lo_do_transfer(lo, READ, page, offset, p->page, p->offset, size, IV)) {
size = 0;
if (lo_do_transfer(lo, READ, page, buf->offset, p->page, p->offset, size, IV)) {
printk(KERN_ERR "loop: transfer error block %ld\n",
page->index);
desc->error = -EINVAL;
size = -EINVAL;
}
flush_dcache_page(p->page);
desc->count = count - size;
desc->written += size;
p->offset += size;
if (size > 0)
p->offset += size;
return size;
}
static int
lo_direct_splice_actor(struct pipe_inode_info *pipe, struct splice_desc *sd)
{
return __splice_from_pipe(pipe, sd, lo_splice_actor);
}
static int
do_lo_receive(struct loop_device *lo,
struct bio_vec *bvec, int bsize, loff_t pos)
{
struct lo_read_data cookie;
struct splice_desc sd;
struct file *file;
int retval;
long retval;
cookie.lo = lo;
cookie.page = bvec->bv_page;
cookie.offset = bvec->bv_offset;
cookie.bsize = bsize;
sd.len = 0;
sd.total_len = bvec->bv_len;
sd.flags = 0;
sd.pos = pos;
sd.u.data = &cookie;
file = lo->lo_backing_file;
retval = file->f_op->sendfile(file, &pos, bvec->bv_len,
lo_read_actor, &cookie);
return (retval < 0)? retval: 0;
retval = splice_direct_to_actor(file, &sd, lo_direct_splice_actor);
if (retval < 0)
return retval;
return 0;
}
static int
@ -679,8 +703,8 @@ static int loop_change_fd(struct loop_device *lo, struct file *lo_file,
if (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))
goto out_putf;
/* new backing store needs to support loop (eg sendfile) */
if (!inode->i_fop->sendfile)
/* new backing store needs to support loop (eg splice_read) */
if (!inode->i_fop->splice_read)
goto out_putf;
/* size of the new backing store needs to be the same */
@ -760,7 +784,7 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
* If we can't read - sorry. If we only can't write - well,
* it's going to be read-only.
*/
if (!file->f_op->sendfile)
if (!file->f_op->splice_read)
goto out_putf;
if (aops->prepare_write && aops->commit_write)
lo_flags |= LO_FLAGS_USE_AOPS;

2
drivers/char/mem.c
View file

@ -24,7 +24,7 @@
#include <linux/crash_dump.h>
#include <linux/backing-dev.h>
#include <linux/bootmem.h>
#include <linux/pipe_fs_i.h>
#include <linux/splice.h>
#include <linux/pfn.h>
#include <asm/uaccess.h>

2
fs/adfs/file.c
View file

@ -33,7 +33,7 @@ const struct file_operations adfs_file_operations = {
.fsync = file_fsync,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
const struct inode_operations adfs_file_inode_operations = {

2
fs/affs/file.c
View file

@ -35,7 +35,7 @@ const struct file_operations affs_file_operations = {
.open = affs_file_open,
.release = affs_file_release,
.fsync = file_fsync,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
const struct inode_operations affs_file_inode_operations = {

2
fs/afs/file.c
View file

@ -32,7 +32,7 @@ const struct file_operations afs_file_operations = {
.aio_read = generic_file_aio_read,
.aio_write = afs_file_write,
.mmap = generic_file_readonly_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.fsync = afs_fsync,
};

7
fs/bad_inode.c
View file

@ -114,12 +114,6 @@ static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
return -EIO;
}
static ssize_t bad_file_sendfile(struct file *in_file, loff_t *ppos,
size_t count, read_actor_t actor, void *target)
{
return -EIO;
}
static ssize_t bad_file_sendpage(struct file *file, struct page *page,
int off, size_t len, loff_t *pos, int more)
{
@ -182,7 +176,6 @@ static const struct file_operations bad_file_ops =
.aio_fsync = bad_file_aio_fsync,
.fasync = bad_file_fasync,
.lock = bad_file_lock,
.sendfile = bad_file_sendfile,
.sendpage = bad_file_sendpage,
.get_unmapped_area = bad_file_get_unmapped_area,
.check_flags = bad_file_check_flags,

2
fs/bfs/file.c
View file

@ -24,7 +24,7 @@ const struct file_operations bfs_file_operations = {
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
static int bfs_move_block(unsigned long from, unsigned long to, struct super_block *sb)

1
fs/block_dev.c
View file

@ -1346,7 +1346,6 @@ const struct file_operations def_blk_fops = {
#ifdef CONFIG_COMPAT
.compat_ioctl = compat_blkdev_ioctl,
#endif
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
};

8
fs/cifs/cifsfs.c
View file

@ -616,7 +616,7 @@ const struct file_operations cifs_file_ops = {
.fsync = cifs_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_POSIX
.ioctl = cifs_ioctl,
@ -637,7 +637,7 @@ const struct file_operations cifs_file_direct_ops = {
.lock = cifs_lock,
.fsync = cifs_fsync,
.flush = cifs_flush,
.sendfile = generic_file_sendfile, /* BB removeme BB */
.splice_read = generic_file_splice_read,
#ifdef CONFIG_CIFS_POSIX
.ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
@ -656,7 +656,7 @@ const struct file_operations cifs_file_nobrl_ops = {
.fsync = cifs_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_POSIX
.ioctl = cifs_ioctl,
@ -676,7 +676,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = {
.release = cifs_close,
.fsync = cifs_fsync,
.flush = cifs_flush,
.sendfile = generic_file_sendfile, /* BB removeme BB */
.splice_read = generic_file_splice_read,
#ifdef CONFIG_CIFS_POSIX
.ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */

11
fs/coda/file.c
View file

@ -47,8 +47,9 @@ coda_file_read(struct file *coda_file, char __user *buf, size_t count, loff_t *p
}
static ssize_t
coda_file_sendfile(struct file *coda_file, loff_t *ppos, size_t count,
read_actor_t actor, void *target)
coda_file_splice_read(struct file *coda_file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t count,
unsigned int flags)
{
struct coda_file_info *cfi;
struct file *host_file;
@ -57,10 +58,10 @@ coda_file_sendfile(struct file *coda_file, loff_t *ppos, size_t count,
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op || !host_file->f_op->sendfile)
if (!host_file->f_op || !host_file->f_op->splice_read)
return -EINVAL;
return host_file->f_op->sendfile(host_file, ppos, count, actor, target);
return host_file->f_op->splice_read(host_file, ppos, pipe, count,flags);
}
static ssize_t
@ -295,6 +296,6 @@ const struct file_operations coda_file_operations = {
.flush = coda_flush,
.release = coda_release,
.fsync = coda_fsync,
.sendfile = coda_file_sendfile,
.splice_read = coda_file_splice_read,
};

15
fs/ecryptfs/file.c
View file

@ -338,16 +338,17 @@ static int ecryptfs_fasync(int fd, struct file *file, int flag)
return rc;
}
static ssize_t ecryptfs_sendfile(struct file *file, loff_t * ppos,
size_t count, read_actor_t actor, void *target)
static ssize_t ecryptfs_splice_read(struct file *file, loff_t * ppos,
struct pipe_inode_info *pipe, size_t count,
unsigned int flags)
{
struct file *lower_file = NULL;
int rc = -EINVAL;
lower_file = ecryptfs_file_to_lower(file);
if (lower_file->f_op && lower_file->f_op->sendfile)
rc = lower_file->f_op->sendfile(lower_file, ppos, count,
actor, target);
if (lower_file->f_op && lower_file->f_op->splice_read)
rc = lower_file->f_op->splice_read(lower_file, ppos, pipe,
count, flags);
return rc;
}
@ -364,7 +365,7 @@ const struct file_operations ecryptfs_dir_fops = {
.release = ecryptfs_release,
.fsync = ecryptfs_fsync,
.fasync = ecryptfs_fasync,
.sendfile = ecryptfs_sendfile,
.splice_read = ecryptfs_splice_read,
};
const struct file_operations ecryptfs_main_fops = {
@ -381,7 +382,7 @@ const struct file_operations ecryptfs_main_fops = {
.release = ecryptfs_release,
.fsync = ecryptfs_fsync,
.fasync = ecryptfs_fasync,
.sendfile = ecryptfs_sendfile,
.splice_read = ecryptfs_splice_read,
};
static int

2
fs/ext2/file.c
View file

@ -53,7 +53,6 @@ const struct file_operations ext2_file_operations = {
.open = generic_file_open,
.release = ext2_release_file,
.fsync = ext2_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
};
@ -71,7 +70,6 @@ const struct file_operations ext2_xip_file_operations = {
.open = generic_file_open,
.release = ext2_release_file,
.fsync = ext2_sync_file,
.sendfile = xip_file_sendfile,
};
#endif

1
fs/ext3/file.c
View file

@ -120,7 +120,6 @@ const struct file_operations ext3_file_operations = {
.open = generic_file_open,
.release = ext3_release_file,
.fsync = ext3_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
};

1
fs/ext4/file.c
View file

@ -120,7 +120,6 @@ const struct file_operations ext4_file_operations = {
.open = generic_file_open,
.release = ext4_release_file,
.fsync = ext4_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
};

2
fs/fat/file.c
View file

@ -134,7 +134,7 @@ const struct file_operations fat_file_operations = {
.release = fat_file_release,
.ioctl = fat_generic_ioctl,
.fsync = file_fsync,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
static int fat_cont_expand(struct inode *inode, loff_t size)

4
fs/fuse/file.c
View file

@ -802,7 +802,7 @@ static const struct file_operations fuse_file_operations = {
.release = fuse_release,
.fsync = fuse_fsync,
.lock = fuse_file_lock,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
static const struct file_operations fuse_direct_io_file_operations = {
@ -814,7 +814,7 @@ static const struct file_operations fuse_direct_io_file_operations = {
.release = fuse_release,
.fsync = fuse_fsync,
.lock = fuse_file_lock,
/* no mmap and sendfile */
/* no mmap and splice_read */
};
static const struct address_space_operations fuse_file_aops = {

1
fs/gfs2/ops_file.c
View file

@ -635,7 +635,6 @@ const struct file_operations gfs2_file_fops = {
.release = gfs2_close,
.fsync = gfs2_fsync,
.lock = gfs2_lock,
.sendfile = generic_file_sendfile,
.flock = gfs2_flock,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,

2
fs/hfs/inode.c
View file

@ -607,7 +607,7 @@ static const struct file_operations hfs_file_operations = {
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.fsync = file_fsync,
.open = hfs_file_open,
.release = hfs_file_release,

2
fs/hfsplus/inode.c
View file

@ -288,7 +288,7 @@ static const struct file_operations hfsplus_file_operations = {
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.fsync = file_fsync,
.open = hfsplus_file_open,
.release = hfsplus_file_release,

2
fs/hostfs/hostfs_kern.c
View file

@ -390,7 +390,7 @@ int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync)
static const struct file_operations hostfs_file_fops = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.write = do_sync_write,

2
fs/hpfs/file.c
View file

@ -129,7 +129,7 @@ const struct file_operations hpfs_file_ops =
.mmap = generic_file_mmap,
.release = hpfs_file_release,
.fsync = hpfs_file_fsync,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
const struct inode_operations hpfs_file_iops =

2
fs/jffs2/file.c
View file

@ -47,7 +47,7 @@ const struct file_operations jffs2_file_operations =
.ioctl = jffs2_ioctl,
.mmap = generic_file_readonly_mmap,
.fsync = jffs2_fsync,
.sendfile = generic_file_sendfile
.splice_read = generic_file_splice_read,
};
/* jffs2_file_inode_operations */

1
fs/jfs/file.c
View file

@ -108,7 +108,6 @@ const struct file_operations jfs_file_operations = {
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
.fsync = jfs_fsync,

2
fs/minix/file.c
View file

@ -23,7 +23,7 @@ const struct file_operations minix_file_operations = {
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.fsync = minix_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
const struct inode_operations minix_file_inode_operations = {

15
fs/nfs/file.c
View file

@ -41,7 +41,9 @@ static int nfs_file_open(struct inode *, struct file *);
static int nfs_file_release(struct inode *, struct file *);
static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
static int nfs_file_mmap(struct file *, struct vm_area_struct *);
static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t count, unsigned int flags);
static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov,
unsigned long nr_segs, loff_t pos);
static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov,
@ -65,7 +67,7 @@ const struct file_operations nfs_file_operations = {
.fsync = nfs_fsync,
.lock = nfs_lock,
.flock = nfs_flock,
.sendfile = nfs_file_sendfile,
.splice_read = nfs_file_splice_read,
.check_flags = nfs_check_flags,
};
@ -224,20 +226,21 @@ nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
}
static ssize_t
nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count,
read_actor_t actor, void *target)
nfs_file_splice_read(struct file *filp, loff_t *ppos,
struct pipe_inode_info *pipe, size_t count,
unsigned int flags)
{
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
ssize_t res;
dfprintk(VFS, "nfs: sendfile(%s/%s, %lu@%Lu)\n",
dfprintk(VFS, "nfs: splice_read(%s/%s, %lu@%Lu)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
(unsigned long) count, (unsigned long long) *ppos);
res = nfs_revalidate_mapping(inode, filp->f_mapping);
if (!res)
res = generic_file_sendfile(filp, ppos, count, actor, target);
res = generic_file_splice_read(filp, ppos, pipe, count, flags);
return res;
}

47
fs/nfsd/vfs.c
View file

@ -23,7 +23,7 @@
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/major.h>
#include <linux/ext2_fs.h>
#include <linux/splice.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
@ -801,26 +801,32 @@ nfsd_get_raparms(dev_t dev, ino_t ino)
}
/*
* Grab and keep cached pages assosiated with a file in the svc_rqst
* so that they can be passed to the netowork sendmsg/sendpage routines
* directrly. They will be released after the sending has completed.
* Grab and keep cached pages associated with a file in the svc_rqst
* so that they can be passed to the network sendmsg/sendpage routines
* directly. They will be released after the sending has completed.
*/
static int
nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
struct splice_desc *sd)
{
unsigned long count = desc->count;
struct svc_rqst *rqstp = desc->arg.data;
struct svc_rqst *rqstp = sd->u.data;
struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
struct page *page = buf->page;
size_t size;
int ret;
if (size > count)
size = count;
ret = buf->ops->confirm(pipe, buf);
if (unlikely(ret))
return ret;
size = sd->len;
if (rqstp->rq_res.page_len == 0) {
get_page(page);
put_page(*pp);
*pp = page;
rqstp->rq_resused++;
rqstp->rq_res.page_base = offset;
rqstp->rq_res.page_base = buf->offset;
rqstp->rq_res.page_len = size;
} else if (page != pp[-1]) {
get_page(page);
@ -832,11 +838,15 @@ nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset
} else
rqstp->rq_res.page_len += size;
desc->count = count - size;
desc->written += size;
return size;
}
static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
struct splice_desc *sd)
{
return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
}
static __be32
nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
@ -861,10 +871,15 @@ nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
if (ra && ra->p_set)
file->f_ra = ra->p_ra;
if (file->f_op->sendfile && rqstp->rq_sendfile_ok) {
rqstp->rq_resused = 1;
host_err = file->f_op->sendfile(file, &offset, *count,
nfsd_read_actor, rqstp);
if (file->f_op->splice_read && rqstp->rq_splice_ok) {
struct splice_desc sd = {
.len = 0,
.total_len = *count,
.pos = offset,
.u.data = rqstp,
};
host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
} else {
oldfs = get_fs();
set_fs(KERNEL_DS);

2
fs/ntfs/file.c
View file

@ -2276,7 +2276,7 @@ const struct file_operations ntfs_file_ops = {
mounted filesystem. */
.mmap = generic_file_mmap, /* Mmap file. */
.open = ntfs_file_open, /* Open file. */
.sendfile = generic_file_sendfile, /* Zero-copy data send with
.splice_read = generic_file_splice_read /* Zero-copy data send with
the data source being on
the ntfs partition. We do
not need to care about the

16
fs/ocfs2/file.c
View file

@ -31,7 +31,7 @@
#include <linux/pagemap.h>
#include <linux/uio.h>
#include <linux/sched.h>
#include <linux/pipe_fs_i.h>
#include <linux/splice.h>
#include <linux/mount.h>
#include <linux/writeback.h>
@ -1583,7 +1583,7 @@ static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe,
ssize_t copied = 0;
struct ocfs2_splice_write_priv sp;
ret = buf->ops->pin(pipe, buf);
ret = buf->ops->confirm(pipe, buf);
if (ret)
goto out;
@ -1604,7 +1604,7 @@ static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe,
* might enter ocfs2_buffered_write_cluster() more
* than once, so keep track of our progress here.
*/
copied = ocfs2_buffered_write_cluster(sd->file,
copied = ocfs2_buffered_write_cluster(sd->u.file,
(loff_t)sd->pos + total,
count,
ocfs2_map_and_write_splice_data,
@ -1636,9 +1636,14 @@ static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe,
int ret, err;
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,
};
ret = __splice_from_pipe(pipe, out, ppos, len, flags,
ocfs2_splice_write_actor);
ret = __splice_from_pipe(pipe, &sd, ocfs2_splice_write_actor);
if (ret > 0) {
*ppos += ret;
@ -1817,7 +1822,6 @@ const struct inode_operations ocfs2_special_file_iops = {
const struct file_operations ocfs2_fops = {
.read = do_sync_read,
.write = do_sync_write,
.sendfile = generic_file_sendfile,
.mmap = ocfs2_mmap,
.fsync = ocfs2_sync_file,
.release = ocfs2_file_release,

70
fs/pipe.c
View file

@ -164,6 +164,20 @@ static void anon_pipe_buf_release(struct pipe_inode_info *pipe,
page_cache_release(page);
}
/**
* generic_pipe_buf_map - virtually map a pipe buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer that should be mapped
* @atomic: whether to use an atomic map
*
* Description:
* This function returns a kernel virtual address mapping for the
* passed in @pipe_buffer. If @atomic is set, an atomic map is provided
* and the caller has to be careful not to fault before calling
* the unmap function.
*
* Note that this function occupies KM_USER0 if @atomic != 0.
*/
void *generic_pipe_buf_map(struct pipe_inode_info *pipe,
struct pipe_buffer *buf, int atomic)
{
@ -175,6 +189,15 @@ void *generic_pipe_buf_map(struct pipe_inode_info *pipe,
return kmap(buf->page);
}
/**
* generic_pipe_buf_unmap - unmap a previously mapped pipe buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer that should be unmapped
* @map_data: the data that the mapping function returned
*
* Description:
* This function undoes the mapping that ->map() provided.
*/
void generic_pipe_buf_unmap(struct pipe_inode_info *pipe,
struct pipe_buffer *buf, void *map_data)
{
@ -185,11 +208,28 @@ void generic_pipe_buf_unmap(struct pipe_inode_info *pipe,
kunmap(buf->page);
}
/**
* generic_pipe_buf_steal - attempt to take ownership of a @pipe_buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer to attempt to steal
*
* Description:
* This function attempts to steal the @struct page attached to
* @buf. If successful, this function returns 0 and returns with
* the page locked. The caller may then reuse the page for whatever
* he wishes, the typical use is insertion into a different file
* page cache.
*/
int generic_pipe_buf_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
struct page *page = buf->page;
/*
* A reference of one is golden, that means that the owner of this
* page is the only one holding a reference to it. lock the page
* and return OK.
*/
if (page_count(page) == 1) {
lock_page(page);
return 0;
@ -198,12 +238,32 @@ int generic_pipe_buf_steal(struct pipe_inode_info *pipe,
return 1;
}
void generic_pipe_buf_get(struct pipe_inode_info *info, struct pipe_buffer *buf)
/**
* generic_pipe_buf_get - get a reference to a @struct pipe_buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer to get a reference to
*
* Description:
* This function grabs an extra reference to @buf. It's used in
* in the tee() system call, when we duplicate the buffers in one
* pipe into another.
*/
void generic_pipe_buf_get(struct pipe_inode_info *pipe, struct pipe_buffer *buf)
{
page_cache_get(buf->page);
}
int generic_pipe_buf_pin(struct pipe_inode_info *info, struct pipe_buffer *buf)
/**
* generic_pipe_buf_confirm - verify contents of the pipe buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer to confirm
*
* Description:
* This function does nothing, because the generic pipe code uses
* pages that are always good when inserted into the pipe.
*/
int generic_pipe_buf_confirm(struct pipe_inode_info *info,
struct pipe_buffer *buf)
{
return 0;
}
@ -212,7 +272,7 @@ static const struct pipe_buf_operations anon_pipe_buf_ops = {
.can_merge = 1,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.pin = generic_pipe_buf_pin,
.confirm = generic_pipe_buf_confirm,
.release = anon_pipe_buf_release,
.steal = generic_pipe_buf_steal,
.get = generic_pipe_buf_get,
@ -252,7 +312,7 @@ pipe_read(struct kiocb *iocb, const struct iovec *_iov,
if (chars > total_len)
chars = total_len;
error = ops->pin(pipe, buf);
error = ops->confirm(pipe, buf);
if (error) {
if (!ret)
error = ret;
@ -373,7 +433,7 @@ pipe_write(struct kiocb *iocb, const struct iovec *_iov,
int error, atomic = 1;
void *addr;
error = ops->pin(pipe, buf);
error = ops->confirm(pipe, buf);
if (error)
goto out;

2
fs/qnx4/file.c
View file

@ -25,7 +25,7 @@ const struct file_operations qnx4_file_operations =
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
#ifdef CONFIG_QNX4FS_RW
.write = do_sync_write,
.aio_write = generic_file_aio_write,

2
fs/ramfs/file-mmu.c
View file

@ -41,7 +41,7 @@ const struct file_operations ramfs_file_operations = {
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.fsync = simple_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.llseek = generic_file_llseek,
};

2
fs/ramfs/file-nommu.c
View file

@ -42,7 +42,7 @@ const struct file_operations ramfs_file_operations = {
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.fsync = simple_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
.llseek = generic_file_llseek,
};

20
fs/read_write.c
View file

@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/syscalls.h>
#include <linux/pagemap.h>
#include <linux/splice.h>
#include "read_write.h"
#include <asm/uaccess.h>
@ -25,7 +26,7 @@ const struct file_operations generic_ro_fops = {
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.mmap = generic_file_readonly_mmap,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
EXPORT_SYMBOL(generic_ro_fops);
@ -708,7 +709,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
struct inode * in_inode, * out_inode;
loff_t pos;
ssize_t retval;
int fput_needed_in, fput_needed_out;
int fput_needed_in, fput_needed_out, fl;
/*
* Get input file, and verify that it is ok..
@ -723,7 +724,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
in_inode = in_file->f_path.dentry->d_inode;
if (!in_inode)
goto fput_in;
if (!in_file->f_op || !in_file->f_op->sendfile)
if (!in_file->f_op || !in_file->f_op->splice_read)
goto fput_in;
retval = -ESPIPE;
if (!ppos)
@ -776,7 +777,18 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
count = max - pos;
}
retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file);
fl = 0;
#if 0
/*
* We need to debate whether we can enable this or not. The
* man page documents EAGAIN return for the output at least,
* and the application is arguably buggy if it doesn't expect
* EAGAIN on a non-blocking file descriptor.
*/
if (in_file->f_flags & O_NONBLOCK)
fl = SPLICE_F_NONBLOCK;
#endif
retval = do_splice_direct(in_file, ppos, out_file, count, fl);
if (retval > 0) {
add_rchar(current, retval);

1
fs/reiserfs/file.c
View file

@ -1531,7 +1531,6 @@ const struct file_operations reiserfs_file_operations = {
.open = generic_file_open,
.release = reiserfs_file_release,
.fsync = reiserfs_sync_file,
.sendfile = generic_file_sendfile,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.splice_read = generic_file_splice_read,

9
fs/smbfs/file.c
View file

@ -262,8 +262,9 @@ smb_file_mmap(struct file * file, struct vm_area_struct * vma)
}
static ssize_t
smb_file_sendfile(struct file *file, loff_t *ppos,
size_t count, read_actor_t actor, void *target)
smb_file_splice_read(struct file *file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t count,
unsigned int flags)
{
struct dentry *dentry = file->f_path.dentry;
ssize_t status;
@ -277,7 +278,7 @@ smb_file_sendfile(struct file *file, loff_t *ppos,
DENTRY_PATH(dentry), status);
goto out;
}
status = generic_file_sendfile(file, ppos, count, actor, target);
status = generic_file_splice_read(file, ppos, pipe, count, flags);
out:
return status;
}
@ -416,7 +417,7 @@ const struct file_operations smb_file_operations =
.open = smb_file_open,
.release = smb_file_release,
.fsync = smb_fsync,
.sendfile = smb_file_sendfile,
.splice_read = smb_file_splice_read,
};
const struct inode_operations smb_file_inode_operations =

413
fs/splice.c
View file

@ -20,7 +20,7 @@
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/pipe_fs_i.h>
#include <linux/splice.h>
#include <linux/mm_inline.h>
#include <linux/swap.h>
#include <linux/writeback.h>
@ -29,22 +29,6 @@
#include <linux/syscalls.h>
#include <linux/uio.h>
struct partial_page {
unsigned int offset;
unsigned int len;
};
/*
* Passed to splice_to_pipe
*/
struct splice_pipe_desc {
struct page **pages; /* page map */
struct partial_page *partial; /* pages[] may not be contig */
int nr_pages; /* number of pages in map */
unsigned int flags; /* splice flags */
const struct pipe_buf_operations *ops;/* ops associated with output pipe */
};
/*
* Attempt to steal a page from a pipe buffer. This should perhaps go into
* a vm helper function, it's already simplified quite a bit by the
@ -101,8 +85,12 @@ static void page_cache_pipe_buf_release(struct pipe_inode_info *pipe,
buf->flags &= ~PIPE_BUF_FLAG_LRU;
}
static int page_cache_pipe_buf_pin(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
/*
* Check whether the contents of buf is OK to access. Since the content
* is a page cache page, IO may be in flight.
*/
static int page_cache_pipe_buf_confirm(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
struct page *page = buf->page;
int err;
@ -143,7 +131,7 @@ static const struct pipe_buf_operations page_cache_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.pin = page_cache_pipe_buf_pin,
.confirm = page_cache_pipe_buf_confirm,
.release = page_cache_pipe_buf_release,
.steal = page_cache_pipe_buf_steal,
.get = generic_pipe_buf_get,
@ -163,18 +151,25 @@ static const struct pipe_buf_operations user_page_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.pin = generic_pipe_buf_pin,
.confirm = generic_pipe_buf_confirm,
.release = page_cache_pipe_buf_release,
.steal = user_page_pipe_buf_steal,
.get = generic_pipe_buf_get,
};
/*
* Pipe output worker. This sets up our pipe format with the page cache
* pipe buffer operations. Otherwise very similar to the regular pipe_writev().
/**
* splice_to_pipe - fill passed data into a pipe
* @pipe: pipe to fill
* @spd: data to fill
*
* Description:
* @spd contains a map of pages and len/offset tupples, a long with
* the struct pipe_buf_operations associated with these pages. This
* function will link that data to the pipe.
*
*/
static ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
struct splice_pipe_desc *spd)
ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
struct splice_pipe_desc *spd)
{
unsigned int spd_pages = spd->nr_pages;
int ret, do_wakeup, page_nr;
@ -201,6 +196,7 @@ static ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
buf->page = spd->pages[page_nr];
buf->offset = spd->partial[page_nr].offset;
buf->len = spd->partial[page_nr].len;
buf->private = spd->partial[page_nr].private;
buf->ops = spd->ops;
if (spd->flags & SPLICE_F_GIFT)
buf->flags |= PIPE_BUF_FLAG_GIFT;
@ -295,11 +291,6 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
*/
page_cache_readahead(mapping, &in->f_ra, in, index, nr_pages);
/*
* Now fill in the holes:
*/
error = 0;
/*
* Lookup the (hopefully) full range of pages we need.
*/
@ -307,8 +298,9 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
/*
* If find_get_pages_contig() returned fewer pages than we needed,
* allocate the rest.
* allocate the rest and fill in the holes.
*/
error = 0;
index += spd.nr_pages;
while (spd.nr_pages < nr_pages) {
/*
@ -470,11 +462,16 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
/**
* generic_file_splice_read - splice data from file to a pipe
* @in: file to splice from
* @ppos: position in @in
* @pipe: pipe to splice to
* @len: number of bytes to splice
* @flags: splice modifier flags
*
* Will read pages from given file and fill them into a pipe.
* Description:
* Will read pages from given file and fill them into a pipe. Can be
* used as long as the address_space operations for the source implements
* a readpage() hook.
*
*/
ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
@ -528,11 +525,11 @@ EXPORT_SYMBOL(generic_file_splice_read);
static int pipe_to_sendpage(struct pipe_inode_info *pipe,
struct pipe_buffer *buf, struct splice_desc *sd)
{
struct file *file = sd->file;
struct file *file = sd->u.file;
loff_t pos = sd->pos;
int ret, more;
ret = buf->ops->pin(pipe, buf);
ret = buf->ops->confirm(pipe, buf);
if (!ret) {
more = (sd->flags & SPLICE_F_MORE) || sd->len < sd->total_len;
@ -566,7 +563,7 @@ static int pipe_to_sendpage(struct pipe_inode_info *pipe,
static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
struct splice_desc *sd)
{
struct file *file = sd->file;
struct file *file = sd->u.file;
struct address_space *mapping = file->f_mapping;
unsigned int offset, this_len;
struct page *page;
@ -576,7 +573,7 @@ static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
/*
* make sure the data in this buffer is uptodate
*/
ret = buf->ops->pin(pipe, buf);
ret = buf->ops->confirm(pipe, buf);
if (unlikely(ret))
return ret;
@ -663,36 +660,37 @@ static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
return ret;
}
/*
* Pipe input worker. Most of this logic works like a regular pipe, the
* 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.
/**
* __splice_from_pipe - splice data from a pipe to given actor
* @pipe: pipe to splice from
* @sd: information to @actor
* @actor: handler that splices the data
*
* Description:
* This function does little more than loop over the pipe and call
* @actor to do the actual moving of a single struct pipe_buffer to
* the desired destination. See pipe_to_file, pipe_to_sendpage, or
* pipe_to_user.
*
*/
ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
struct file *out, loff_t *ppos, size_t len,
unsigned int flags, splice_actor *actor)
ssize_t __splice_from_pipe(struct pipe_inode_info *pipe, struct splice_desc *sd,
splice_actor *actor)
{
int ret, do_wakeup, err;
struct splice_desc sd;
ret = 0;
do_wakeup = 0;
sd.total_len = len;
sd.flags = flags;
sd.file = out;
sd.pos = *ppos;
for (;;) {
if (pipe->nrbufs) {
struct pipe_buffer *buf = pipe->bufs + pipe->curbuf;
const struct pipe_buf_operations *ops = buf->ops;
sd.len = buf->len;
if (sd.len > sd.total_len)
sd.len = sd.total_len;
sd->len = buf->len;
if (sd->len > sd->total_len)
sd->len = sd->total_len;
err = actor(pipe, buf, &sd);
err = actor(pipe, buf, sd);
if (err <= 0) {
if (!ret && err != -ENODATA)
ret = err;
@ -704,10 +702,10 @@ ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
buf->offset += err;
buf->len -= err;
sd.len -= err;
sd.pos += err;
sd.total_len -= err;
if (sd.len)
sd->len -= err;
sd->pos += err;
sd->total_len -= err;
if (sd->len)
continue;
if (!buf->len) {
@ -719,7 +717,7 @@ ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
do_wakeup = 1;
}
if (!sd.total_len)
if (!sd->total_len)
break;
}
@ -732,7 +730,7 @@ ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
break;
}
if (flags & SPLICE_F_NONBLOCK) {
if (sd->flags & SPLICE_F_NONBLOCK) {
if (!ret)
ret = -EAGAIN;
break;
@ -766,12 +764,32 @@ ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
}
EXPORT_SYMBOL(__splice_from_pipe);
/**
* splice_from_pipe - splice data from a pipe to a file
* @pipe: pipe to splice from
* @out: file to splice to
* @ppos: position in @out
* @len: how many bytes to splice
* @flags: splice modifier flags
* @actor: handler that splices the data
*
* Description:
* See __splice_from_pipe. This function locks the input and output inodes,
* otherwise it's identical to __splice_from_pipe().
*
*/
ssize_t splice_from_pipe(struct pipe_inode_info *pipe, struct file *out,
loff_t *ppos, size_t len, unsigned int flags,
splice_actor *actor)
{
ssize_t ret;
struct inode *inode = out->f_mapping->host;
struct splice_desc sd = {
.total_len = len,
.flags = flags,
.pos = *ppos,
.u.file = out,
};
/*
* The actor worker might be calling ->prepare_write and
@ -780,7 +798,7 @@ ssize_t splice_from_pipe(struct pipe_inode_info *pipe, struct file *out,
* pipe->inode, we have to order lock acquiry here.
*/
inode_double_lock(inode, pipe->inode);
ret = __splice_from_pipe(pipe, out, ppos, len, flags, actor);
ret = __splice_from_pipe(pipe, &sd, actor);
inode_double_unlock(inode, pipe->inode);
return ret;
@ -790,12 +808,14 @@ ssize_t splice_from_pipe(struct pipe_inode_info *pipe, struct file *out,
* generic_file_splice_write_nolock - generic_file_splice_write without mutexes
* @pipe: pipe info
* @out: file to write to
* @ppos: position in @out
* @len: number of bytes to splice
* @flags: splice modifier flags
*
* Will either move or copy pages (determined by @flags options) from
* the given pipe inode to the given file. The caller is responsible
* for acquiring i_mutex on both inodes.
* Description:
* Will either move or copy pages (determined by @flags options) from
* the given pipe inode to the given file. The caller is responsible
* for acquiring i_mutex on both inodes.
*
*/
ssize_t
@ -804,6 +824,12 @@ generic_file_splice_write_nolock(struct pipe_inode_info *pipe, struct file *out,
{
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;
int err;
@ -811,7 +837,7 @@ generic_file_splice_write_nolock(struct pipe_inode_info *pipe, struct file *out,
if (unlikely(err))
return err;
ret = __splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_file);
ret = __splice_from_pipe(pipe, &sd, pipe_to_file);
if (ret > 0) {
unsigned long nr_pages;
@ -841,11 +867,13 @@ EXPORT_SYMBOL(generic_file_splice_write_nolock);
* generic_file_splice_write - splice data from a pipe to a file
* @pipe: pipe info
* @out: file to write to
* @ppos: position in @out
* @len: number of bytes to splice
* @flags: splice modifier flags
*
* Will either move or copy pages (determined by @flags options) from
* the given pipe inode to the given file.
* Description:
* Will either move or copy pages (determined by @flags options) from
* the given pipe inode to the given file.
*
*/
ssize_t
@ -896,13 +924,15 @@ EXPORT_SYMBOL(generic_file_splice_write);
/**
* generic_splice_sendpage - splice data from a pipe to a socket
* @inode: pipe inode
* @pipe: pipe to splice from
* @out: socket to write to
* @ppos: position in @out
* @len: number of bytes to splice
* @flags: splice modifier flags
*
* Will send @len bytes from the pipe to a network socket. No data copying
* is involved.
* Description:
* Will send @len bytes from the pipe to a network socket. No data copying
* is involved.
*
*/
ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, struct file *out,
@ -956,14 +986,27 @@ static long do_splice_to(struct file *in, loff_t *ppos,
return in->f_op->splice_read(in, ppos, pipe, len, flags);
}
long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
size_t len, unsigned int flags)
/**
* splice_direct_to_actor - splices data directly between two non-pipes
* @in: file to splice from
* @sd: actor information on where to splice to
* @actor: handles the data splicing
*
* Description:
* This is a special case helper to splice directly between two
* points, without requiring an explicit pipe. Internally an allocated
* pipe is cached in the process, and reused during the life time of
* that process.
*
*/
ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
splice_direct_actor *actor)
{
struct pipe_inode_info *pipe;
long ret, bytes;
loff_t out_off;
umode_t i_mode;
int i;
size_t len;
int i, flags;
/*
* We require the input being a regular file, as we don't want to
@ -999,7 +1042,13 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
*/
ret = 0;
bytes = 0;
out_off = 0;
len = sd->total_len;
flags = sd->flags;
/*
* Don't block on output, we have to drain the direct pipe.
*/
sd->flags &= ~SPLICE_F_NONBLOCK;
while (len) {
size_t read_len, max_read_len;
@ -1009,19 +1058,19 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
*/
max_read_len = min(len, (size_t)(PIPE_BUFFERS*PAGE_SIZE));
ret = do_splice_to(in, ppos, pipe, max_read_len, flags);
ret = do_splice_to(in, &sd->pos, pipe, max_read_len, flags);
if (unlikely(ret < 0))
goto out_release;
read_len = ret;
sd->total_len = read_len;
/*
* NOTE: nonblocking mode only applies to the input. We
* 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, &out_off, read_len,
flags & ~SPLICE_F_NONBLOCK);
ret = actor(pipe, sd);
if (unlikely(ret < 0))
goto out_release;
@ -1066,6 +1115,48 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
return bytes;
return ret;
}
EXPORT_SYMBOL(splice_direct_to_actor);
static int direct_splice_actor(struct pipe_inode_info *pipe,
struct splice_desc *sd)
{
struct file *file = sd->u.file;
return do_splice_from(pipe, file, &sd->pos, sd->total_len, sd->flags);
}
/**
* do_splice_direct - splices data directly between two files
* @in: file to splice from
* @ppos: input file offset
* @out: file to splice to
* @len: number of bytes to splice
* @flags: splice modifier flags
*
* Description:
* For use by do_sendfile(). splice can easily emulate sendfile, but
* doing it in the application would incur an extra system call
* (splice in + splice out, as compared to just sendfile()). So this helper
* can splice directly through a process-private pipe.
*
*/
long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
size_t len, unsigned int flags)
{
struct splice_desc sd = {
.len = len,
.total_len = len,
.flags = flags,
.pos = *ppos,
.u.file = out,
};
size_t ret;
ret = splice_direct_to_actor(in, &sd, direct_splice_actor);
*ppos = sd.pos;
return ret;
}
/*
@ -1248,28 +1339,131 @@ static int get_iovec_page_array(const struct iovec __user *iov,
return error;
}
static int pipe_to_user(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
struct splice_desc *sd)
{
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
*/
if (!fault_in_pages_writeable(sd->u.userptr, sd->len)) {
src = buf->ops->map(pipe, buf, 1);
ret = __copy_to_user_inatomic(sd->u.userptr, src + buf->offset,
sd->len);
buf->ops->unmap(pipe, buf, src);
if (!ret) {
ret = sd->len;
goto out;
}
}
/*
* No dice, use slow non-atomic map and copy
*/
src = buf->ops->map(pipe, buf, 0);
ret = sd->len;
if (copy_to_user(sd->u.userptr, src + buf->offset, sd->len))
ret = -EFAULT;
out:
if (ret > 0)
sd->u.userptr += ret;
buf->ops->unmap(pipe, buf, src);
return ret;
}
/*
* For lack of a better implementation, implement vmsplice() to userspace
* as a simple copy of the pipes pages to the user iov.
*/
static long vmsplice_to_user(struct file *file, const struct iovec __user *iov,
unsigned long nr_segs, unsigned int flags)
{
struct pipe_inode_info *pipe;
struct splice_desc sd;
ssize_t size;
int error;
long ret;
pipe = pipe_info(file->f_path.dentry->d_inode);
if (!pipe)
return -EBADF;
if (pipe->inode)
mutex_lock(&pipe->inode->i_mutex);
error = ret = 0;
while (nr_segs) {
void __user *base;
size_t len;
/*
* Get user address base and length for this iovec.
*/
error = get_user(base, &iov->iov_base);
if (unlikely(error))
break;
error = get_user(len, &iov->iov_len);
if (unlikely(error))
break;
/*
* Sanity check this iovec. 0 read succeeds.
*/
if (unlikely(!len))
break;
if (unlikely(!base)) {
error = -EFAULT;
break;
}
sd.len = 0;
sd.total_len = len;
sd.flags = flags;
sd.u.userptr = base;
sd.pos = 0;
size = __splice_from_pipe(pipe, &sd, pipe_to_user);
if (size < 0) {
if (!ret)
ret = size;
break;
}
ret += size;
if (size < len)
break;
nr_segs--;
iov++;
}
if (pipe->inode)
mutex_unlock(&pipe->inode->i_mutex);
if (!ret)
ret = error;
return ret;
}
/*
* vmsplice splices a user address range into a pipe. It can be thought of
* as splice-from-memory, where the regular splice is splice-from-file (or
* to file). In both cases the output is a pipe, naturally.
*
* Note that vmsplice only supports splicing _from_ user memory to a pipe,
* not the other way around. Splicing from user memory is a simple operation
* that can be supported without any funky alignment restrictions or nasty
* vm tricks. We simply map in the user memory and fill them into a pipe.
* The reverse isn't quite as easy, though. There are two possible solutions
* for that:
*
* - memcpy() the data internally, at which point we might as well just
* do a regular read() on the buffer anyway.
* - Lots of nasty vm tricks, that are neither fast nor flexible (it
* has restriction limitations on both ends of the pipe).
*
* Alas, it isn't here.
*
*/
static long do_vmsplice(struct file *file, const struct iovec __user *iov,
unsigned long nr_segs, unsigned int flags)
static long vmsplice_to_pipe(struct file *file, const struct iovec __user *iov,
unsigned long nr_segs, unsigned int flags)
{
struct pipe_inode_info *pipe;
struct page *pages[PIPE_BUFFERS];
@ -1284,10 +1478,6 @@ static long do_vmsplice(struct file *file, const struct iovec __user *iov,
pipe = pipe_info(file->f_path.dentry->d_inode);
if (!pipe)
return -EBADF;
if (unlikely(nr_segs > UIO_MAXIOV))
return -EINVAL;
else if (unlikely(!nr_segs))
return 0;
spd.nr_pages = get_iovec_page_array(iov, nr_segs, pages, partial,
flags & SPLICE_F_GIFT);
@ -1297,6 +1487,22 @@ static long do_vmsplice(struct file *file, const struct iovec __user *iov,
return splice_to_pipe(pipe, &spd);
}
/*
* Note that vmsplice only really supports true splicing _from_ user memory
* to a pipe, not the other way around. Splicing from user memory is a simple
* operation that can be supported without any funky alignment restrictions
* or nasty vm tricks. We simply map in the user memory and fill them into
* a pipe. The reverse isn't quite as easy, though. There are two possible
* solutions for that:
*
* - memcpy() the data internally, at which point we might as well just
* do a regular read() on the buffer anyway.
* - Lots of nasty vm tricks, that are neither fast nor flexible (it
* has restriction limitations on both ends of the pipe).
*
* Currently we punt and implement it as a normal copy, see pipe_to_user().
*
*/
asmlinkage long sys_vmsplice(int fd, const struct iovec __user *iov,
unsigned long nr_segs, unsigned int flags)
{
@ -1304,11 +1510,18 @@ asmlinkage long sys_vmsplice(int fd, const struct iovec __user *iov,
long error;
int fput;
if (unlikely(nr_segs > UIO_MAXIOV))
return -EINVAL;
else if (unlikely(!nr_segs))
return 0;
error = -EBADF;
file = fget_light(fd, &fput);
if (file) {
if (file->f_mode & FMODE_WRITE)
error = do_vmsplice(file, iov, nr_segs, flags);
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);
}

2
fs/sysv/file.c
View file

@ -27,7 +27,7 @@ const struct file_operations sysv_file_operations = {
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.fsync = sysv_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
const struct inode_operations sysv_file_inode_operations = {

2
fs/udf/file.c
View file

@ -261,7 +261,7 @@ const struct file_operations udf_file_operations = {
.aio_write = udf_file_aio_write,
.release = udf_release_file,
.fsync = udf_fsync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};
const struct inode_operations udf_file_inode_operations = {

2
fs/ufs/file.c
View file

@ -60,5 +60,5 @@ const struct file_operations ufs_file_operations = {
.mmap = generic_file_mmap,
.open = generic_file_open,
.fsync = ufs_sync_file,
.sendfile = generic_file_sendfile,
.splice_read = generic_file_splice_read,
};

26
fs/xfs/linux-2.6/xfs_file.c
View file

@ -123,30 +123,6 @@ xfs_file_aio_write_invis(
return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
}
STATIC ssize_t
xfs_file_sendfile(
struct file *filp,
loff_t *pos,
size_t count,
read_actor_t actor,
void *target)
{
return bhv_vop_sendfile(vn_from_inode(filp->f_path.dentry->d_inode),
filp, pos, 0, count, actor, target, NULL);
}
STATIC ssize_t
xfs_file_sendfile_invis(
struct file *filp,
loff_t *pos,
size_t count,
read_actor_t actor,
void *target)
{
return bhv_vop_sendfile(vn_from_inode(filp->f_path.dentry->d_inode),
filp, pos, IO_INVIS, count, actor, target, NULL);
}
STATIC ssize_t
xfs_file_splice_read(
struct file *infilp,
@ -452,7 +428,6 @@ const struct file_operations xfs_file_operations = {
.write = do_sync_write,
.aio_read = xfs_file_aio_read,
.aio_write = xfs_file_aio_write,
.sendfile = xfs_file_sendfile,
.splice_read = xfs_file_splice_read,
.splice_write = xfs_file_splice_write,
.unlocked_ioctl = xfs_file_ioctl,
@ -475,7 +450,6 @@ const struct file_operations xfs_invis_file_operations = {
.write = do_sync_write,
.aio_read = xfs_file_aio_read_invis,
.aio_write = xfs_file_aio_write_invis,
.sendfile = xfs_file_sendfile_invis,
.splice_read = xfs_file_splice_read_invis,
.splice_write = xfs_file_splice_write_invis,
.unlocked_ioctl = xfs_file_ioctl_invis,

1
fs/xfs/linux-2.6/xfs_linux.h
View file

@ -101,7 +101,6 @@
* Feature macros (disable/enable)
*/
#undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
#define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
#define HAVE_SPLICE /* a splice(2) exists in 2.6, but not in 2.4 */
#ifdef CONFIG_SMP
#define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */

44
fs/xfs/linux-2.6/xfs_lrw.c
View file

@ -286,50 +286,6 @@ xfs_read(
return ret;
}
ssize_t
xfs_sendfile(
bhv_desc_t *bdp,
struct file *filp,
loff_t *offset,
int ioflags,
size_t count,
read_actor_t actor,
void *target,
cred_t *credp)
{
xfs_inode_t *ip = XFS_BHVTOI(bdp);
xfs_mount_t *mp = ip->i_mount;
ssize_t ret;
XFS_STATS_INC(xs_read_calls);
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
xfs_ilock(ip, XFS_IOLOCK_SHARED);
if (DM_EVENT_ENABLED(BHV_TO_VNODE(bdp)->v_vfsp, ip, DM_EVENT_READ) &&
(!(ioflags & IO_INVIS))) {
bhv_vrwlock_t locktype = VRWLOCK_READ;
int error;
error = XFS_SEND_DATA(mp, DM_EVENT_READ, BHV_TO_VNODE(bdp),
*offset, count,
FILP_DELAY_FLAG(filp), &locktype);
if (error) {
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
return -error;
}
}
xfs_rw_enter_trace(XFS_SENDFILE_ENTER, &ip->i_iocore,
(void *)(unsigned long)target, count, *offset, ioflags);
ret = generic_file_sendfile(filp, offset, count, actor, target);
if (ret > 0)
XFS_STATS_ADD(xs_read_bytes, ret);
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
return ret;
}
ssize_t
xfs_splice_read(
bhv_desc_t *bdp,

3
fs/xfs/linux-2.6/xfs_lrw.h
View file

@ -90,9 +90,6 @@ extern ssize_t xfs_read(struct bhv_desc *, struct kiocb *,
extern ssize_t xfs_write(struct bhv_desc *, struct kiocb *,
const struct iovec *, unsigned int,
loff_t *, int, struct cred *);
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 *, loff_t *,
struct pipe_inode_info *, size_t, int, int,
struct cred *);

6
fs/xfs/linux-2.6/xfs_vnode.h
View file

@ -139,9 +139,6 @@ typedef ssize_t (*vop_read_t)(bhv_desc_t *, struct kiocb *,
typedef ssize_t (*vop_write_t)(bhv_desc_t *, struct kiocb *,
const struct iovec *, unsigned int,
loff_t *, int, struct cred *);
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 *, loff_t *,
struct pipe_inode_info *, size_t, int, int,
struct cred *);
@ -206,7 +203,6 @@ typedef struct bhv_vnodeops {
vop_close_t vop_close;
vop_read_t vop_read;
vop_write_t vop_write;
vop_sendfile_t vop_sendfile;
vop_splice_read_t vop_splice_read;
vop_splice_write_t vop_splice_write;
vop_ioctl_t vop_ioctl;
@ -254,8 +250,6 @@ typedef struct bhv_vnodeops {
VOP(vop_read, vp)(VNHEAD(vp),file,iov,segs,offset,ioflags,cr)
#define bhv_vop_write(vp,file,iov,segs,offset,ioflags,cr) \
VOP(vop_write, vp)(VNHEAD(vp),file,iov,segs,offset,ioflags,cr)
#define bhv_vop_sendfile(vp,f,off,ioflags,cnt,act,targ,cr) \
VOP(vop_sendfile, vp)(VNHEAD(vp),f,off,ioflags,cnt,act,targ,cr)
#define bhv_vop_splice_read(vp,f,o,pipe,cnt,fl,iofl,cr) \
VOP(vop_splice_read, vp)(VNHEAD(vp),f,o,pipe,cnt,fl,iofl,cr)
#define bhv_vop_splice_write(vp,f,o,pipe,cnt,fl,iofl,cr) \

3
fs/xfs/xfs_vnodeops.c
View file

@ -4680,9 +4680,6 @@ bhv_vnodeops_t xfs_vnodeops = {
.vop_open = xfs_open,
.vop_close = xfs_close,
.vop_read = xfs_read,
#ifdef HAVE_SENDFILE
.vop_sendfile = xfs_sendfile,
#endif
#ifdef HAVE_SPLICE
.vop_splice_read = xfs_splice_read,
.vop_splice_write = xfs_splice_write,

7
include/linux/fs.h
View file

@ -1054,7 +1054,7 @@ struct block_device_operations {
};
/*
* "descriptor" for what we're up to with a read for sendfile().
* "descriptor" for what we're up to with a read.
* This allows us to use the same read code yet
* have multiple different users of the data that
* we read from a file.
@ -1105,7 +1105,6 @@ struct file_operations {
int (*aio_fsync) (struct kiocb *, int datasync);
int (*fasync) (int, struct file *, int);
int (*lock) (struct file *, int, struct file_lock *);
ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
int (*check_flags)(int);
@ -1762,7 +1761,6 @@ extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
unsigned long, loff_t, loff_t *, size_t, ssize_t);
extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
extern void do_generic_mapping_read(struct address_space *mapping,
struct file_ra_state *, struct file *,
loff_t *, read_descriptor_t *, read_actor_t);
@ -1792,9 +1790,6 @@ extern int nonseekable_open(struct inode * inode, struct file * filp);
#ifdef CONFIG_FS_XIP
extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
loff_t *ppos);
extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
size_t count, read_actor_t actor,
void *target);
extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
size_t len, loff_t *ppos);

117
include/linux/pipe_fs_i.h
View file

@ -9,13 +9,39 @@
#define PIPE_BUF_FLAG_ATOMIC 0x02 /* was atomically mapped */
#define PIPE_BUF_FLAG_GIFT 0x04 /* page is a gift */
/**
* struct pipe_buffer - a linux kernel pipe buffer
* @page: the page containing the data for the pipe buffer
* @offset: offset of data inside the @page
* @len: length of data inside the @page
* @ops: operations associated with this buffer. See @pipe_buf_operations.
* @flags: pipe buffer flags. See above.
* @private: private data owned by the ops.
**/
struct pipe_buffer {
struct page *page;
unsigned int offset, len;
const struct pipe_buf_operations *ops;
unsigned int flags;
unsigned long private;
};
/**
* struct pipe_inode_info - a linux kernel pipe
* @wait: reader/writer wait point in case of empty/full pipe
* @nrbufs: the number of non-empty pipe buffers in this pipe
* @curbuf: the current pipe buffer entry
* @tmp_page: cached released page
* @readers: number of current readers of this pipe
* @writers: number of current writers of this pipe
* @waiting_writers: number of writers blocked waiting for room
* @r_counter: reader counter
* @w_counter: writer counter
* @fasync_readers: reader side fasync
* @fasync_writers: writer side fasync
* @inode: inode this pipe is attached to
* @bufs: the circular array of pipe buffers
**/
struct pipe_inode_info {
wait_queue_head_t wait;
unsigned int nrbufs, curbuf;
@ -34,22 +60,73 @@ struct pipe_inode_info {
/*
* Note on the nesting of these functions:
*
* ->pin()
* ->confirm()
* ->steal()
* ...
* ->map()
* ...
* ->unmap()
*
* That is, ->map() must be called on a pinned buffer, same goes for ->steal().
* That is, ->map() must be called on a confirmed buffer,
* same goes for ->steal(). See below for the meaning of each
* operation. Also see kerneldoc in fs/pipe.c for the pipe
* and generic variants of these hooks.
*/
struct pipe_buf_operations {
/*
* This is set to 1, if the generic pipe read/write may coalesce
* data into an existing buffer. If this is set to 0, a new pipe
* page segment is always used for new data.
*/
int can_merge;
/*
* ->map() returns a virtual address mapping of the pipe buffer.
* The last integer flag reflects whether this should be an atomic
* mapping or not. The atomic map is faster, however you can't take
* page faults before calling ->unmap() again. So if you need to eg
* access user data through copy_to/from_user(), then you must get
* a non-atomic map. ->map() uses the KM_USER0 atomic slot for
* atomic maps, so you can't map more than one pipe_buffer at once
* and you have to be careful if mapping another page as source
* or destination for a copy (IOW, it has to use something else
* than KM_USER0).
*/
void * (*map)(struct pipe_inode_info *, struct pipe_buffer *, int);
/*
* Undoes ->map(), finishes the virtual mapping of the pipe buffer.
*/
void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *, void *);
int (*pin)(struct pipe_inode_info *, struct pipe_buffer *);
/*
* ->confirm() verifies that the data in the pipe buffer is there
* and that the contents are good. If the pages in the pipe belong
* to a file system, we may need to wait for IO completion in this
* hook. Returns 0 for good, or a negative error value in case of
* error.
*/
int (*confirm)(struct pipe_inode_info *, struct pipe_buffer *);
/*
* When the contents of this pipe buffer has been completely
* consumed by a reader, ->release() is called.
*/
void (*release)(struct pipe_inode_info *, struct pipe_buffer *);
/*
* Attempt to take ownership of the pipe buffer and its contents.
* ->steal() returns 0 for success, in which case the contents
* of the pipe (the buf->page) is locked and now completely owned
* by the caller. The page may then be transferred to a different
* mapping, the most often used case is insertion into different
* file address space cache.
*/
int (*steal)(struct pipe_inode_info *, struct pipe_buffer *);
/*
* Get a reference to the pipe buffer.
*/
void (*get)(struct pipe_inode_info *, struct pipe_buffer *);
};
@ -68,39 +145,7 @@ void __free_pipe_info(struct pipe_inode_info *);
void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *, int);
void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *, void *);
void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_pin(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_confirm(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);
/*
* splice is tied to pipes as a transport (at least for now), so we'll just
* add the splice flags here.
*/
#define SPLICE_F_MOVE (0x01) /* move pages instead of copying */
#define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
/* we may still block on the fd we splice */
/* from/to, of course */
#define SPLICE_F_MORE (0x04) /* expect more data */
#define SPLICE_F_GIFT (0x08) /* pages passed in are a gift */
/*
* Passed to the actors
*/
struct splice_desc {
unsigned int len, total_len; /* current and remaining length */
unsigned int flags; /* splice flags */
struct file *file; /* file to read/write */
loff_t pos; /* file position */
};
typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *,
struct splice_desc *);
extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
loff_t *, size_t, unsigned int,
splice_actor *);
extern ssize_t __splice_from_pipe(struct pipe_inode_info *, struct file *,
loff_t *, size_t, unsigned int,
splice_actor *);
#endif

73
include/linux/splice.h Normal file
View file

@ -0,0 +1,73 @@
/*
* Function declerations and data structures related to the splice
* implementation.
*
* Copyright (C) 2007 Jens Axboe <jens.axboe@oracle.com>
*
*/
#ifndef SPLICE_H
#define SPLICE_H
#include <linux/pipe_fs_i.h>
/*
* splice is tied to pipes as a transport (at least for now), so we'll just
* add the splice flags here.
*/
#define SPLICE_F_MOVE (0x01) /* move pages instead of copying */
#define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
/* we may still block on the fd we splice */
/* from/to, of course */
#define SPLICE_F_MORE (0x04) /* expect more data */
#define SPLICE_F_GIFT (0x08) /* pages passed in are a gift */
/*
* Passed to the actors
*/
struct splice_desc {
unsigned int len, total_len; /* current and remaining length */
unsigned int flags; /* splice flags */
/*
* actor() private data
*/
union {
void __user *userptr; /* memory to write to */
struct file *file; /* file to read/write */
void *data; /* cookie */
} u;
loff_t pos; /* file position */
};
struct partial_page {
unsigned int offset;
unsigned int len;
unsigned long private;
};
/*
* Passed to splice_to_pipe
*/
struct splice_pipe_desc {
struct page **pages; /* page map */
struct partial_page *partial; /* pages[] may not be contig */
int nr_pages; /* number of pages in map */
unsigned int flags; /* splice flags */
const struct pipe_buf_operations *ops;/* ops associated with output pipe */
};
typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *,
struct splice_desc *);
typedef int (splice_direct_actor)(struct pipe_inode_info *,
struct splice_desc *);
extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
loff_t *, size_t, unsigned int,
splice_actor *);
extern ssize_t __splice_from_pipe(struct pipe_inode_info *,
struct splice_desc *, splice_actor *);
extern ssize_t splice_to_pipe(struct pipe_inode_info *,
struct splice_pipe_desc *);
extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *,
splice_direct_actor *);
#endif

2
include/linux/sunrpc/svc.h
View file

@ -253,7 +253,7 @@ struct svc_rqst {
* determine what device number
* to report (real or virtual)
*/
int rq_sendfile_ok; /* turned off in gss privacy
int rq_splice_ok; /* turned off in gss privacy
* to prevent encrypting page
* cache pages */
wait_queue_head_t rq_wait; /* synchronization */

205
kernel/relay.c
View file

@ -21,6 +21,7 @@
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/splice.h>
/* list of open channels, for cpu hotplug */
static DEFINE_MUTEX(relay_channels_mutex);
@ -121,6 +122,7 @@ static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)
buf->page_array[i] = alloc_page(GFP_KERNEL);
if (unlikely(!buf->page_array[i]))
goto depopulate;
set_page_private(buf->page_array[i], (unsigned long)buf);
}
mem = vmap(buf->page_array, n_pages, VM_MAP, PAGE_KERNEL);
if (!mem)
@ -970,43 +972,6 @@ static int subbuf_read_actor(size_t read_start,
return ret;
}
/*
* subbuf_send_actor - send up to one subbuf's worth of data
*/
static int subbuf_send_actor(size_t read_start,
struct rchan_buf *buf,
size_t avail,
read_descriptor_t *desc,
read_actor_t actor)
{
unsigned long pidx, poff;
unsigned int subbuf_pages;
int ret = 0;
subbuf_pages = buf->chan->alloc_size >> PAGE_SHIFT;
pidx = (read_start / PAGE_SIZE) % subbuf_pages;
poff = read_start & ~PAGE_MASK;
while (avail) {
struct page *p = buf->page_array[pidx];
unsigned int len;
len = PAGE_SIZE - poff;
if (len > avail)
len = avail;
len = actor(desc, p, poff, len);
if (desc->error)
break;
avail -= len;
ret += len;
poff = 0;
pidx = (pidx + 1) % subbuf_pages;
}
return ret;
}
typedef int (*subbuf_actor_t) (size_t read_start,
struct rchan_buf *buf,
size_t avail,
@ -1067,19 +1032,159 @@ static ssize_t relay_file_read(struct file *filp,
NULL, &desc);
}
static ssize_t relay_file_sendfile(struct file *filp,
loff_t *ppos,
size_t count,
read_actor_t actor,
void *target)
static void relay_consume_bytes(struct rchan_buf *rbuf, int bytes_consumed)
{
read_descriptor_t desc;
desc.written = 0;
desc.count = count;
desc.arg.data = target;
desc.error = 0;
return relay_file_read_subbufs(filp, ppos, subbuf_send_actor,
actor, &desc);
rbuf->bytes_consumed += bytes_consumed;
if (rbuf->bytes_consumed >= rbuf->chan->subbuf_size) {
relay_subbufs_consumed(rbuf->chan, rbuf->cpu, 1);
rbuf->bytes_consumed %= rbuf->chan->subbuf_size;
}
}
static void relay_pipe_buf_release(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
struct rchan_buf *rbuf;
rbuf = (struct rchan_buf *)page_private(buf->page);
relay_consume_bytes(rbuf, buf->private);
}
static struct pipe_buf_operations relay_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = relay_pipe_buf_release,
.steal = generic_pipe_buf_steal,
.get = generic_pipe_buf_get,
};
/**
* subbuf_splice_actor - splice up to one subbuf's worth of data
*/
static int subbuf_splice_actor(struct file *in,
loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len,
unsigned int flags,
int *nonpad_ret)
{
unsigned int pidx, poff, total_len, subbuf_pages, ret;
struct rchan_buf *rbuf = in->private_data;
unsigned int subbuf_size = rbuf->chan->subbuf_size;
size_t read_start = ((size_t)*ppos) % rbuf->chan->alloc_size;
size_t read_subbuf = read_start / subbuf_size;
size_t padding = rbuf->padding[read_subbuf];
size_t nonpad_end = read_subbuf * subbuf_size + subbuf_size - padding;
struct page *pages[PIPE_BUFFERS];
struct partial_page partial[PIPE_BUFFERS];
struct splice_pipe_desc spd = {
.pages = pages,
.nr_pages = 0,
.partial = partial,
.flags = flags,
.ops = &relay_pipe_buf_ops,
};
if (rbuf->subbufs_produced == rbuf->subbufs_consumed)
return 0;
/*
* Adjust read len, if longer than what is available
*/
if (len > (subbuf_size - read_start % subbuf_size))
len = subbuf_size - read_start % subbuf_size;
subbuf_pages = rbuf->chan->alloc_size >> PAGE_SHIFT;
pidx = (read_start / PAGE_SIZE) % subbuf_pages;
poff = read_start & ~PAGE_MASK;
for (total_len = 0; spd.nr_pages < subbuf_pages; spd.nr_pages++) {
unsigned int this_len, this_end, private;
unsigned int cur_pos = read_start + total_len;
if (!len)
break;
this_len = min_t(unsigned long, len, PAGE_SIZE - poff);
private = this_len;
spd.pages[spd.nr_pages] = rbuf->page_array[pidx];
spd.partial[spd.nr_pages].offset = poff;
this_end = cur_pos + this_len;
if (this_end >= nonpad_end) {
this_len = nonpad_end - cur_pos;
private = this_len + padding;
}
spd.partial[spd.nr_pages].len = this_len;
spd.partial[spd.nr_pages].private = private;
len -= this_len;
total_len += this_len;
poff = 0;
pidx = (pidx + 1) % subbuf_pages;
if (this_end >= nonpad_end) {
spd.nr_pages++;
break;
}
}
if (!spd.nr_pages)
return 0;
ret = *nonpad_ret = splice_to_pipe(pipe, &spd);
if (ret < 0 || ret < total_len)
return ret;
if (read_start + ret == nonpad_end)
ret += padding;
return ret;
}
static ssize_t relay_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;
int nonpad_ret = 0;
ret = 0;
spliced = 0;
while (len) {
ret = subbuf_splice_actor(in, ppos, pipe, len, flags, &nonpad_ret);
if (ret < 0)
break;
else if (!ret) {
if (spliced)
break;
if (flags & SPLICE_F_NONBLOCK) {
ret = -EAGAIN;
break;
}
}
*ppos += ret;
if (ret > len)
len = 0;
else
len -= ret;
spliced += nonpad_ret;
nonpad_ret = 0;
}
if (spliced)
return spliced;
return ret;
}
const struct file_operations relay_file_operations = {
@ -1089,7 +1194,7 @@ const struct file_operations relay_file_operations = {
.read = relay_file_read,
.llseek = no_llseek,
.release = relay_file_release,
.sendfile = relay_file_sendfile,
.splice_read = relay_file_splice_read,
};
EXPORT_SYMBOL_GPL(relay_file_operations);

20
mm/filemap.c
View file

@ -1245,26 +1245,6 @@ int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long o
return written;
}
ssize_t generic_file_sendfile(struct file *in_file, loff_t *ppos,
size_t count, read_actor_t actor, void *target)
{
read_descriptor_t desc;
if (!count)
return 0;
desc.written = 0;
desc.count = count;
desc.arg.data = target;
desc.error = 0;
do_generic_file_read(in_file, ppos, &desc, actor);
if (desc.written)
return desc.written;
return desc.error;
}
EXPORT_SYMBOL(generic_file_sendfile);
static ssize_t
do_readahead(struct address_space *mapping, struct file *filp,
unsigned long index, unsigned long nr)

22
mm/filemap_xip.c
View file

@ -159,28 +159,6 @@ xip_file_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
}
EXPORT_SYMBOL_GPL(xip_file_read);
ssize_t
xip_file_sendfile(struct file *in_file, loff_t *ppos,
size_t count, read_actor_t actor, void *target)
{
read_descriptor_t desc;
if (!count)
return 0;
desc.written = 0;
desc.count = count;
desc.arg.data = target;
desc.error = 0;
do_xip_mapping_read(in_file->f_mapping, &in_file->f_ra, in_file,
ppos, &desc, actor);
if (desc.written)
return desc.written;
return desc.error;
}
EXPORT_SYMBOL_GPL(xip_file_sendfile);
/*
* __xip_unmap is invoked from xip_unmap and
* xip_write

42
mm/shmem.c
View file

@ -1100,9 +1100,9 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
* Normally, filepage is NULL on entry, and either found
* uptodate immediately, or allocated and zeroed, or read
* in under swappage, which is then assigned to filepage.
* But shmem_prepare_write passes in a locked filepage,
* which may be found not uptodate by other callers too,
* and may need to be copied from the swappage read in.
* But shmem_readpage and shmem_prepare_write pass in a locked
* filepage, which may be found not uptodate by other callers
* too, and may need to be copied from the swappage read in.
*/
repeat:
if (!filepage)
@ -1485,9 +1485,18 @@ static const struct inode_operations shmem_symlink_inode_operations;
static const struct inode_operations shmem_symlink_inline_operations;
/*
* Normally tmpfs makes no use of shmem_prepare_write, but it
* lets a tmpfs file be used read-write below the loop driver.
* Normally tmpfs avoids the use of shmem_readpage and shmem_prepare_write;
* but providing them allows a tmpfs file to be used for splice, sendfile, and
* below the loop driver, in the generic fashion that many filesystems support.
*/
static int shmem_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
int error = shmem_getpage(inode, page->index, &page, SGP_CACHE, NULL);
unlock_page(page);
return error;
}
static int
shmem_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
{
@ -1711,25 +1720,6 @@ static ssize_t shmem_file_read(struct file *filp, char __user *buf, size_t count
return desc.error;
}
static ssize_t shmem_file_sendfile(struct file *in_file, loff_t *ppos,
size_t count, read_actor_t actor, void *target)
{
read_descriptor_t desc;
if (!count)
return 0;
desc.written = 0;
desc.count = count;
desc.arg.data = target;
desc.error = 0;
do_shmem_file_read(in_file, ppos, &desc, actor);
if (desc.written)
return desc.written;
return desc.error;
}
static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct shmem_sb_info *sbinfo = SHMEM_SB(dentry->d_sb);
@ -2386,6 +2376,7 @@ static const struct address_space_operations shmem_aops = {
.writepage = shmem_writepage,
.set_page_dirty = __set_page_dirty_no_writeback,
#ifdef CONFIG_TMPFS
.readpage = shmem_readpage,
.prepare_write = shmem_prepare_write,
.commit_write = simple_commit_write,
#endif
@ -2399,7 +2390,8 @@ static const struct file_operations shmem_file_operations = {
.read = shmem_file_read,
.write = shmem_file_write,
.fsync = simple_sync_file,
.sendfile = shmem_file_sendfile,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
#endif
};

2
net/sunrpc/auth_gss/svcauth_gss.c
View file

@ -853,7 +853,7 @@ unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gs
u32 priv_len, maj_stat;
int pad, saved_len, remaining_len, offset;
rqstp->rq_sendfile_ok = 0;
rqstp->rq_splice_ok = 0;
priv_len = svc_getnl(&buf->head[0]);
if (rqstp->rq_deferred) {

2
net/sunrpc/svc.c
View file

@ -814,7 +814,7 @@ svc_process(struct svc_rqst *rqstp)
rqstp->rq_res.tail[0].iov_base = NULL;
rqstp->rq_res.tail[0].iov_len = 0;
/* Will be turned off only in gss privacy case: */
rqstp->rq_sendfile_ok = 1;
rqstp->rq_splice_ok = 1;
/* tcp needs a space for the record length... */
if (rqstp->rq_prot == IPPROTO_TCP)
svc_putnl(resv, 0);