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aio: Kill unneeded kiocb members

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The old aio retry infrastucture needed to save the various arguments to
to aio operations. But with the retry infrastructure gone, we can trim
struct kiocb quite a bit.

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>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
This commit is contained in:
Kent Overstreet 2013-02-25 16:36:27 -08:00 committed by Benjamin LaHaise
parent 73a7075e3f
commit 8bc92afcf7
2 changed files with 42 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
fs/aio.c
View File

@ -723,8 +723,6 @@ static void kiocb_free(struct kiocb *req)
eventfd_ctx_put(req->ki_eventfd);
if (req->ki_dtor)
req->ki_dtor(req);
if (req->ki_iovec != &req->ki_inline_vec)
kfree(req->ki_iovec);
kmem_cache_free(kiocb_cachep, req);
}
@ -1054,24 +1052,26 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
typedef ssize_t (aio_rw_op)(struct kiocb *, const struct iovec *,
unsigned long, loff_t);
static ssize_t aio_setup_vectored_rw(int rw, struct kiocb *kiocb, bool compat)
static ssize_t aio_setup_vectored_rw(struct kiocb *kiocb,
int rw, char __user *buf,
unsigned long *nr_segs,
struct iovec **iovec,
bool compat)
{
ssize_t ret;
kiocb->ki_nr_segs = kiocb->ki_nbytes;
*nr_segs = kiocb->ki_nbytes;
#ifdef CONFIG_COMPAT
if (compat)
ret = compat_rw_copy_check_uvector(rw,
(struct compat_iovec __user *)kiocb->ki_buf,
kiocb->ki_nr_segs, 1, &kiocb->ki_inline_vec,
&kiocb->ki_iovec);
(struct compat_iovec __user *)buf,
*nr_segs, 1, *iovec, iovec);
else
#endif
ret = rw_copy_check_uvector(rw,
(struct iovec __user *)kiocb->ki_buf,
kiocb->ki_nr_segs, 1, &kiocb->ki_inline_vec,
&kiocb->ki_iovec);
(struct iovec __user *)buf,
*nr_segs, 1, *iovec, iovec);
if (ret < 0)
return ret;
@ -1080,15 +1080,17 @@ static ssize_t aio_setup_vectored_rw(int rw, struct kiocb *kiocb, bool compat)
return 0;
}
static ssize_t aio_setup_single_vector(int rw, struct kiocb *kiocb)
static ssize_t aio_setup_single_vector(struct kiocb *kiocb,
int rw, char __user *buf,
unsigned long *nr_segs,
struct iovec *iovec)
{
if (unlikely(!access_ok(!rw, kiocb->ki_buf, kiocb->ki_nbytes)))
if (unlikely(!access_ok(!rw, buf, kiocb->ki_nbytes)))
return -EFAULT;
kiocb->ki_iovec = &kiocb->ki_inline_vec;
kiocb->ki_iovec->iov_base = kiocb->ki_buf;
kiocb->ki_iovec->iov_len = kiocb->ki_nbytes;
kiocb->ki_nr_segs = 1;
iovec->iov_base = buf;
iovec->iov_len = kiocb->ki_nbytes;
*nr_segs = 1;
return 0;
}
@ -1097,15 +1099,18 @@ static ssize_t aio_setup_single_vector(int rw, struct kiocb *kiocb)
* Performs the initial checks and aio retry method
* setup for the kiocb at the time of io submission.
*/
static ssize_t aio_run_iocb(struct kiocb *req, bool compat)
static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
char __user *buf, bool compat)
{
struct file *file = req->ki_filp;
ssize_t ret;
unsigned long nr_segs;
int rw;
fmode_t mode;
aio_rw_op *rw_op;
struct iovec inline_vec, *iovec = &inline_vec;
switch (req->ki_opcode) {
switch (opcode) {
case IOCB_CMD_PREAD:
case IOCB_CMD_PREADV:
mode = FMODE_READ;
@ -1126,16 +1131,21 @@ static ssize_t aio_run_iocb(struct kiocb *req, bool compat)
if (!rw_op)
return -EINVAL;
ret = (req->ki_opcode == IOCB_CMD_PREADV ||
req->ki_opcode == IOCB_CMD_PWRITEV)
? aio_setup_vectored_rw(rw, req, compat)
: aio_setup_single_vector(rw, req);
ret = (opcode == IOCB_CMD_PREADV ||
opcode == IOCB_CMD_PWRITEV)
? aio_setup_vectored_rw(req, rw, buf, &nr_segs,
&iovec, compat)
: aio_setup_single_vector(req, rw, buf, &nr_segs,
iovec);
if (ret)
return ret;
ret = rw_verify_area(rw, file, &req->ki_pos, req->ki_nbytes);
if (ret < 0)
if (ret < 0) {
if (iovec != &inline_vec)
kfree(iovec);
return ret;
}
req->ki_nbytes = ret;
@ -1149,8 +1159,7 @@ static ssize_t aio_run_iocb(struct kiocb *req, bool compat)
if (rw == WRITE)
file_start_write(file);
ret = rw_op(req, req->ki_iovec,
req->ki_nr_segs, req->ki_pos);
ret = rw_op(req, iovec, nr_segs, req->ki_pos);
if (rw == WRITE)
file_end_write(file);
@ -1175,6 +1184,9 @@ static ssize_t aio_run_iocb(struct kiocb *req, bool compat)
return -EINVAL;
}
if (iovec != &inline_vec)
kfree(iovec);
if (ret != -EIOCBQUEUED) {
/*
* There's no easy way to restart the syscall since other AIO's
@ -1246,12 +1258,11 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
req->ki_obj.user = user_iocb;
req->ki_user_data = iocb->aio_data;
req->ki_pos = iocb->aio_offset;
req->ki_buf = (char __user *)(unsigned long)iocb->aio_buf;
req->ki_nbytes = iocb->aio_nbytes;
req->ki_opcode = iocb->aio_lio_opcode;
ret = aio_run_iocb(req, compat);
ret = aio_run_iocb(req, iocb->aio_lio_opcode,
(char __user *)(unsigned long)iocb->aio_buf,
compat);
if (ret)
goto out_put_req;

11
include/linux/aio.h
View File

@ -36,6 +36,7 @@ struct kiocb {
struct kioctx *ki_ctx; /* NULL for sync ops */
kiocb_cancel_fn *ki_cancel;
void (*ki_dtor)(struct kiocb *);
void *private;
union {
void __user *user;
@ -44,15 +45,7 @@ struct kiocb {
__u64 ki_user_data; /* user's data for completion */
loff_t ki_pos;
void *private;
/* State that we remember to be able to restart/retry */
unsigned short ki_opcode;
size_t ki_nbytes; /* copy of iocb->aio_nbytes */
char __user *ki_buf; /* remaining iocb->aio_buf */
struct iovec ki_inline_vec; /* inline vector */
struct iovec *ki_iovec;
unsigned long ki_nr_segs;
size_t ki_nbytes; /* copy of iocb->aio_nbytes */
struct list_head ki_list; /* the aio core uses this
* for cancellation */