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aio: Kill aio_rw_vect_retry()

Browse source 
This code doesn't serve any purpose anymore, since the aio retry
infrastructure has been removed.

This change should be safe because aio_read/write are also used for
synchronous IO, and called from do_sync_read()/do_sync_write() - and
there's no looping done in the sync case (the read and write syscalls).

Signed-off-by: Kent Overstreet <koverstreet@google.com>
Cc: Zach Brown <zab@redhat.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Asai Thambi S P <asamymuthupa@micron.com>
Cc: Selvan Mani <smani@micron.com>
Cc: Sam Bradshaw <sbradshaw@micron.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
This commit is contained in:
Kent Overstreet 2013-05-09 15:03:42 -07:00 committed by Benjamin LaHaise
parent 5ffac122db
commit 73a7075e3f
11 changed files with 28 additions and 90 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/staging/android/logger.c
View file

@ -481,7 +481,7 @@ static ssize_t logger_aio_write(struct kiocb *iocb, const struct iovec *iov,
header.sec = now.tv_sec;
header.nsec = now.tv_nsec;
header.euid = current_euid();
header.len = min_t(size_t, iocb->ki_left, LOGGER_ENTRY_MAX_PAYLOAD);
header.len = min_t(size_t, iocb->ki_nbytes, LOGGER_ENTRY_MAX_PAYLOAD);
header.hdr_size = sizeof(struct logger_entry);
/* null writes succeed, return zero */

6
drivers/usb/gadget/inode.c
View file

@ -708,11 +708,11 @@ ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
if (unlikely(usb_endpoint_dir_in(&epdata->desc)))
return -EINVAL;
buf = kmalloc(iocb->ki_left, GFP_KERNEL);
buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL);
if (unlikely(!buf))
return -ENOMEM;
return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs);
return ep_aio_rwtail(iocb, buf, iocb->ki_nbytes, epdata, iov, nr_segs);
}
static ssize_t
@ -727,7 +727,7 @@ ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (unlikely(!usb_endpoint_dir_in(&epdata->desc)))
return -EINVAL;
buf = kmalloc(iocb->ki_left, GFP_KERNEL);
buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL);
if (unlikely(!buf))
return -ENOMEM;

91
fs/aio.c
View file

@ -707,7 +707,7 @@ static inline struct kiocb *aio_get_req(struct kioctx *ctx)
if (unlikely(!req))
goto out_put;
atomic_set(&req->ki_users, 2);
atomic_set(&req->ki_users, 1);
req->ki_ctx = ctx;
return req;
out_put:
@ -1051,75 +1051,9 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
return -EINVAL;
}
static void aio_advance_iovec(struct kiocb *iocb, ssize_t ret)
{
struct iovec *iov = &iocb->ki_iovec[iocb->ki_cur_seg];
BUG_ON(ret <= 0);
while (iocb->ki_cur_seg < iocb->ki_nr_segs && ret > 0) {
ssize_t this = min((ssize_t)iov->iov_len, ret);
iov->iov_base += this;
iov->iov_len -= this;
iocb->ki_left -= this;
ret -= this;
if (iov->iov_len == 0) {
iocb->ki_cur_seg++;
iov++;
}
}
/* the caller should not have done more io than what fit in
* the remaining iovecs */
BUG_ON(ret > 0 && iocb->ki_left == 0);
}
typedef ssize_t (aio_rw_op)(struct kiocb *, const struct iovec *,
unsigned long, loff_t);
static ssize_t aio_rw_vect_retry(struct kiocb *iocb, int rw, aio_rw_op *rw_op)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
ssize_t ret = 0;
/* This matches the pread()/pwrite() logic */
if (iocb->ki_pos < 0)
return -EINVAL;
if (rw == WRITE)
file_start_write(file);
do {
ret = rw_op(iocb, &iocb->ki_iovec[iocb->ki_cur_seg],
iocb->ki_nr_segs - iocb->ki_cur_seg,
iocb->ki_pos);
if (ret > 0)
aio_advance_iovec(iocb, ret);
/* retry all partial writes. retry partial reads as long as its a
* regular file. */
} while (ret > 0 && iocb->ki_left > 0 &&
(rw == WRITE ||
(!S_ISFIFO(inode->i_mode) && !S_ISSOCK(inode->i_mode))));
if (rw == WRITE)
file_end_write(file);
/* This means we must have transferred all that we could */
/* No need to retry anymore */
if ((ret == 0) || (iocb->ki_left == 0))
ret = iocb->ki_nbytes - iocb->ki_left;
/* If we managed to write some out we return that, rather than
* the eventual error. */
if (rw == WRITE
&& ret < 0 && ret != -EIOCBQUEUED
&& iocb->ki_nbytes - iocb->ki_left)
ret = iocb->ki_nbytes - iocb->ki_left;
return ret;
}
static ssize_t aio_setup_vectored_rw(int rw, struct kiocb *kiocb, bool compat)
{
ssize_t ret;
@ -1204,9 +1138,22 @@ static ssize_t aio_run_iocb(struct kiocb *req, bool compat)
return ret;
req->ki_nbytes = ret;
req->ki_left = ret;
ret = aio_rw_vect_retry(req, rw, rw_op);
/* XXX: move/kill - rw_verify_area()? */
/* This matches the pread()/pwrite() logic */
if (req->ki_pos < 0) {
ret = -EINVAL;
break;
}
if (rw == WRITE)
file_start_write(file);
ret = rw_op(req, req->ki_iovec,
req->ki_nr_segs, req->ki_pos);
if (rw == WRITE)
file_end_write(file);
break;
case IOCB_CMD_FDSYNC:
@ -1301,19 +1248,17 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
req->ki_pos = iocb->aio_offset;
req->ki_buf = (char __user *)(unsigned long)iocb->aio_buf;
req->ki_left = req->ki_nbytes = iocb->aio_nbytes;
req->ki_nbytes = iocb->aio_nbytes;
req->ki_opcode = iocb->aio_lio_opcode;
ret = aio_run_iocb(req, compat);
if (ret)
goto out_put_req;
aio_put_req(req); /* drop extra ref to req */
return 0;
out_put_req:
put_reqs_available(ctx, 1);
aio_put_req(req); /* drop extra ref to req */
aio_put_req(req); /* drop i/o ref to req */
aio_put_req(req);
return ret;
}

2
fs/block_dev.c
View file

@ -1542,7 +1542,7 @@ static ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov,
return 0;
size -= pos;
if (size < iocb->ki_left)
if (size < iocb->ki_nbytes)
nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size);
return generic_file_aio_read(iocb, iov, nr_segs, pos);
}

1
fs/nfs/direct.c
View file

@ -130,7 +130,6 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_
return -EINVAL;
#else
VM_BUG_ON(iocb->ki_left != PAGE_SIZE);
VM_BUG_ON(iocb->ki_nbytes != PAGE_SIZE);
if (rw == READ || rw == KERNEL_READ)

6
fs/ocfs2/file.c
View file

@ -2245,7 +2245,7 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
file->f_path.dentry->d_name.name,
(unsigned int)nr_segs);
if (iocb->ki_left == 0)
if (iocb->ki_nbytes == 0)
return 0;
appending = file->f_flags & O_APPEND ? 1 : 0;
@ -2296,7 +2296,7 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
can_do_direct = direct_io;
ret = ocfs2_prepare_inode_for_write(file, ppos,
iocb->ki_left, appending,
iocb->ki_nbytes, appending,
&can_do_direct, &has_refcount);
if (ret < 0) {
mlog_errno(ret);
@ -2304,7 +2304,7 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
}
if (direct_io && !is_sync_kiocb(iocb))
unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_left,
unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_nbytes,
*ppos);
/*

3
fs/read_write.c
View file

@ -367,7 +367,6 @@ ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *pp
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
kiocb.ki_left = len;
kiocb.ki_nbytes = len;
ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
@ -417,7 +416,6 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
kiocb.ki_left = len;
kiocb.ki_nbytes = len;
ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
@ -599,7 +597,6 @@ static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
kiocb.ki_left = len;
kiocb.ki_nbytes = len;
ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos);

2
fs/udf/file.c
View file

@ -141,7 +141,7 @@ static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
int err, pos;
size_t count = iocb->ki_left;
size_t count = iocb->ki_nbytes;
struct udf_inode_info *iinfo = UDF_I(inode);
down_write(&iinfo->i_data_sem);

2
include/linux/aio.h
View file

@ -50,11 +50,9 @@ struct kiocb {
unsigned short ki_opcode;
size_t ki_nbytes; /* copy of iocb->aio_nbytes */
char __user *ki_buf; /* remaining iocb->aio_buf */
size_t ki_left; /* remaining bytes */
struct iovec ki_inline_vec; /* inline vector */
struct iovec *ki_iovec;
unsigned long ki_nr_segs;
unsigned long ki_cur_seg;
struct list_head ki_list; /* the aio core uses this
* for cancellation */

1
mm/page_io.c
View file

@ -266,7 +266,6 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
init_sync_kiocb(&kiocb, swap_file);
kiocb.ki_pos = page_file_offset(page);
kiocb.ki_left = PAGE_SIZE;
kiocb.ki_nbytes = PAGE_SIZE;
set_page_writeback(page);

2
net/socket.c
View file

@ -931,7 +931,7 @@ static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
if (pos != 0)
return -ESPIPE;
if (iocb->ki_left == 0) /* Match SYS5 behaviour */
if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
return 0;