提交 c5e4ca6d 编写于 作者: L Linus Torvalds

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull VFS fixes from Al Viro:
 "Christoph's and Jan's aio fixes, fixup for generic_file_splice_read
  (removal of pointless detritus that actually breaks it when used for
  gfs2 ->splice_read()) and fixup for generic_file_read_iter()
  interaction with ITER_PIPE destinations."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  splice: remove detritus from generic_file_splice_read()
  mm/filemap: don't allow partially uptodate page for pipes
  aio: fix freeze protection of aio writes
  fs: remove aio_run_iocb
  fs: remove the never implemented aio_fsync file operation
  aio: hold an extra file reference over AIO read/write operations
......@@ -447,7 +447,6 @@ prototypes:
int (*flush) (struct file *);
int (*release) (struct inode *, struct file *);
int (*fsync) (struct file *, loff_t start, loff_t end, int datasync);
int (*aio_fsync) (struct kiocb *, int datasync);
int (*fasync) (int, struct file *, int);
int (*lock) (struct file *, int, struct file_lock *);
ssize_t (*readv) (struct file *, const struct iovec *, unsigned long,
......
......@@ -828,7 +828,6 @@ struct file_operations {
int (*flush) (struct file *, fl_owner_t id);
int (*release) (struct inode *, struct file *);
int (*fsync) (struct file *, loff_t, loff_t, int datasync);
int (*aio_fsync) (struct kiocb *, int datasync);
int (*fasync) (int, struct file *, int);
int (*lock) (struct file *, int, struct file_lock *);
ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
......
......@@ -1078,6 +1078,17 @@ static void aio_complete(struct kiocb *kiocb, long res, long res2)
unsigned tail, pos, head;
unsigned long flags;
if (kiocb->ki_flags & IOCB_WRITE) {
struct file *file = kiocb->ki_filp;
/*
* Tell lockdep we inherited freeze protection from submission
* thread.
*/
__sb_writers_acquired(file_inode(file)->i_sb, SB_FREEZE_WRITE);
file_end_write(file);
}
/*
* Special case handling for sync iocbs:
* - events go directly into the iocb for fast handling
......@@ -1392,122 +1403,106 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
return -EINVAL;
}
typedef ssize_t (rw_iter_op)(struct kiocb *, struct iov_iter *);
static int aio_setup_vectored_rw(int rw, char __user *buf, size_t len,
struct iovec **iovec,
bool compat,
struct iov_iter *iter)
static int aio_setup_rw(int rw, struct iocb *iocb, struct iovec **iovec,
bool vectored, bool compat, struct iov_iter *iter)
{
void __user *buf = (void __user *)(uintptr_t)iocb->aio_buf;
size_t len = iocb->aio_nbytes;
if (!vectored) {
ssize_t ret = import_single_range(rw, buf, len, *iovec, iter);
*iovec = NULL;
return ret;
}
#ifdef CONFIG_COMPAT
if (compat)
return compat_import_iovec(rw,
(struct compat_iovec __user *)buf,
len, UIO_FASTIOV, iovec, iter);
return compat_import_iovec(rw, buf, len, UIO_FASTIOV, iovec,
iter);
#endif
return import_iovec(rw, (struct iovec __user *)buf,
len, UIO_FASTIOV, iovec, iter);
return import_iovec(rw, buf, len, UIO_FASTIOV, iovec, iter);
}
/*
* aio_run_iocb:
* Performs the initial checks and io submission.
*/
static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
char __user *buf, size_t len, bool compat)
static inline ssize_t aio_ret(struct kiocb *req, ssize_t ret)
{
switch (ret) {
case -EIOCBQUEUED:
return ret;
case -ERESTARTSYS:
case -ERESTARTNOINTR:
case -ERESTARTNOHAND:
case -ERESTART_RESTARTBLOCK:
/*
* There's no easy way to restart the syscall since other AIO's
* may be already running. Just fail this IO with EINTR.
*/
ret = -EINTR;
/*FALLTHRU*/
default:
aio_complete(req, ret, 0);
return 0;
}
}
static ssize_t aio_read(struct kiocb *req, struct iocb *iocb, bool vectored,
bool compat)
{
struct file *file = req->ki_filp;
ssize_t ret;
int rw;
fmode_t mode;
rw_iter_op *iter_op;
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
struct iov_iter iter;
ssize_t ret;
switch (opcode) {
case IOCB_CMD_PREAD:
case IOCB_CMD_PREADV:
mode = FMODE_READ;
rw = READ;
iter_op = file->f_op->read_iter;
goto rw_common;
case IOCB_CMD_PWRITE:
case IOCB_CMD_PWRITEV:
mode = FMODE_WRITE;
rw = WRITE;
iter_op = file->f_op->write_iter;
goto rw_common;
rw_common:
if (unlikely(!(file->f_mode & mode)))
return -EBADF;
if (!iter_op)
return -EINVAL;
if (opcode == IOCB_CMD_PREADV || opcode == IOCB_CMD_PWRITEV)
ret = aio_setup_vectored_rw(rw, buf, len,
&iovec, compat, &iter);
else {
ret = import_single_range(rw, buf, len, iovec, &iter);
iovec = NULL;
}
if (!ret)
ret = rw_verify_area(rw, file, &req->ki_pos,
iov_iter_count(&iter));
if (ret < 0) {
kfree(iovec);
return ret;
}
if (rw == WRITE)
file_start_write(file);
ret = iter_op(req, &iter);
if (rw == WRITE)
file_end_write(file);
kfree(iovec);
break;
case IOCB_CMD_FDSYNC:
if (!file->f_op->aio_fsync)
return -EINVAL;
ret = file->f_op->aio_fsync(req, 1);
break;
if (unlikely(!(file->f_mode & FMODE_READ)))
return -EBADF;
if (unlikely(!file->f_op->read_iter))
return -EINVAL;
case IOCB_CMD_FSYNC:
if (!file->f_op->aio_fsync)
return -EINVAL;
ret = aio_setup_rw(READ, iocb, &iovec, vectored, compat, &iter);
if (ret)
return ret;
ret = rw_verify_area(READ, file, &req->ki_pos, iov_iter_count(&iter));
if (!ret)
ret = aio_ret(req, file->f_op->read_iter(req, &iter));
kfree(iovec);
return ret;
}
ret = file->f_op->aio_fsync(req, 0);
break;
static ssize_t aio_write(struct kiocb *req, struct iocb *iocb, bool vectored,
bool compat)
{
struct file *file = req->ki_filp;
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
struct iov_iter iter;
ssize_t ret;
default:
pr_debug("EINVAL: no operation provided\n");
if (unlikely(!(file->f_mode & FMODE_WRITE)))
return -EBADF;
if (unlikely(!file->f_op->write_iter))
return -EINVAL;
}
if (ret != -EIOCBQUEUED) {
ret = aio_setup_rw(WRITE, iocb, &iovec, vectored, compat, &iter);
if (ret)
return ret;
ret = rw_verify_area(WRITE, file, &req->ki_pos, iov_iter_count(&iter));
if (!ret) {
req->ki_flags |= IOCB_WRITE;
file_start_write(file);
ret = aio_ret(req, file->f_op->write_iter(req, &iter));
/*
* There's no easy way to restart the syscall since other AIO's
* may be already running. Just fail this IO with EINTR.
* We release freeze protection in aio_complete(). Fool lockdep
* by telling it the lock got released so that it doesn't
* complain about held lock when we return to userspace.
*/
if (unlikely(ret == -ERESTARTSYS || ret == -ERESTARTNOINTR ||
ret == -ERESTARTNOHAND ||
ret == -ERESTART_RESTARTBLOCK))
ret = -EINTR;
aio_complete(req, ret, 0);
__sb_writers_release(file_inode(file)->i_sb, SB_FREEZE_WRITE);
}
return 0;
kfree(iovec);
return ret;
}
static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
struct iocb *iocb, bool compat)
{
struct aio_kiocb *req;
struct file *file;
ssize_t ret;
/* enforce forwards compatibility on users */
......@@ -1530,7 +1525,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
if (unlikely(!req))
return -EAGAIN;
req->common.ki_filp = fget(iocb->aio_fildes);
req->common.ki_filp = file = fget(iocb->aio_fildes);
if (unlikely(!req->common.ki_filp)) {
ret = -EBADF;
goto out_put_req;
......@@ -1565,13 +1560,29 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
req->ki_user_iocb = user_iocb;
req->ki_user_data = iocb->aio_data;
ret = aio_run_iocb(&req->common, iocb->aio_lio_opcode,
(char __user *)(unsigned long)iocb->aio_buf,
iocb->aio_nbytes,
compat);
if (ret)
goto out_put_req;
get_file(file);
switch (iocb->aio_lio_opcode) {
case IOCB_CMD_PREAD:
ret = aio_read(&req->common, iocb, false, compat);
break;
case IOCB_CMD_PWRITE:
ret = aio_write(&req->common, iocb, false, compat);
break;
case IOCB_CMD_PREADV:
ret = aio_read(&req->common, iocb, true, compat);
break;
case IOCB_CMD_PWRITEV:
ret = aio_write(&req->common, iocb, true, compat);
break;
default:
pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode);
ret = -EINVAL;
break;
}
fput(file);
if (ret && ret != -EIOCBQUEUED)
goto out_put_req;
return 0;
out_put_req:
put_reqs_available(ctx, 1);
......
......@@ -1544,8 +1544,6 @@ const struct file_operations ntfs_dir_ops = {
.iterate = ntfs_readdir, /* Read directory contents. */
#ifdef NTFS_RW
.fsync = ntfs_dir_fsync, /* Sync a directory to disk. */
/*.aio_fsync = ,*/ /* Sync all outstanding async
i/o operations on a kiocb. */
#endif /* NTFS_RW */
/*.ioctl = ,*/ /* Perform function on the
mounted filesystem. */
......
......@@ -299,13 +299,8 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
{
struct iov_iter to;
struct kiocb kiocb;
loff_t isize;
int idx, ret;
isize = i_size_read(in->f_mapping->host);
if (unlikely(*ppos >= isize))
return 0;
iov_iter_pipe(&to, ITER_PIPE | READ, pipe, len);
idx = to.idx;
init_sync_kiocb(&kiocb, in);
......
......@@ -321,6 +321,7 @@ struct writeback_control;
#define IOCB_HIPRI (1 << 3)
#define IOCB_DSYNC (1 << 4)
#define IOCB_SYNC (1 << 5)
#define IOCB_WRITE (1 << 6)
struct kiocb {
struct file *ki_filp;
......@@ -1709,7 +1710,6 @@ struct file_operations {
int (*flush) (struct file *, fl_owner_t id);
int (*release) (struct inode *, struct file *);
int (*fsync) (struct file *, loff_t, loff_t, int datasync);
int (*aio_fsync) (struct kiocb *, int datasync);
int (*fasync) (int, struct file *, int);
int (*lock) (struct file *, int, struct file_lock *);
ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
......
......@@ -1732,6 +1732,9 @@ static ssize_t do_generic_file_read(struct file *filp, loff_t *ppos,
if (inode->i_blkbits == PAGE_SHIFT ||
!mapping->a_ops->is_partially_uptodate)
goto page_not_up_to_date;
/* pipes can't handle partially uptodate pages */
if (unlikely(iter->type & ITER_PIPE))
goto page_not_up_to_date;
if (!trylock_page(page))
goto page_not_up_to_date;
/* Did it get truncated before we got the lock? */
......
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