Commit 67ba049f authored by Al Viro's avatar Al Viro

aio: fold do_io_submit() into callers

get rid of insane "copy array of 32bit pointers into an array of
native ones" glue.
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 95af8496
...@@ -1818,8 +1818,20 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, ...@@ -1818,8 +1818,20 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
return ret; return ret;
} }
static long do_io_submit(aio_context_t ctx_id, long nr, /* sys_io_submit:
struct iocb __user *__user *iocbpp, bool compat) * Queue the nr iocbs pointed to by iocbpp for processing. Returns
* the number of iocbs queued. May return -EINVAL if the aio_context
* specified by ctx_id is invalid, if nr is < 0, if the iocb at
* *iocbpp[0] is not properly initialized, if the operation specified
* is invalid for the file descriptor in the iocb. May fail with
* -EFAULT if any of the data structures point to invalid data. May
* fail with -EBADF if the file descriptor specified in the first
* iocb is invalid. May fail with -EAGAIN if insufficient resources
* are available to queue any iocbs. Will return 0 if nr is 0. Will
* fail with -ENOSYS if not implemented.
*/
SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
struct iocb __user * __user *, iocbpp)
{ {
struct kioctx *ctx; struct kioctx *ctx;
long ret = 0; long ret = 0;
...@@ -1832,9 +1844,6 @@ static long do_io_submit(aio_context_t ctx_id, long nr, ...@@ -1832,9 +1844,6 @@ static long do_io_submit(aio_context_t ctx_id, long nr,
if (unlikely(nr > LONG_MAX/sizeof(*iocbpp))) if (unlikely(nr > LONG_MAX/sizeof(*iocbpp)))
nr = LONG_MAX/sizeof(*iocbpp); nr = LONG_MAX/sizeof(*iocbpp);
if (unlikely(!access_ok(VERIFY_READ, iocbpp, (nr*sizeof(*iocbpp)))))
return -EFAULT;
ctx = lookup_ioctx(ctx_id); ctx = lookup_ioctx(ctx_id);
if (unlikely(!ctx)) { if (unlikely(!ctx)) {
pr_debug("EINVAL: invalid context id\n"); pr_debug("EINVAL: invalid context id\n");
...@@ -1842,20 +1851,15 @@ static long do_io_submit(aio_context_t ctx_id, long nr, ...@@ -1842,20 +1851,15 @@ static long do_io_submit(aio_context_t ctx_id, long nr,
} }
blk_start_plug(&plug); blk_start_plug(&plug);
for (i = 0; i < nr; i++) {
/*
* AKPM: should this return a partial result if some of the IOs were
* successfully submitted?
*/
for (i=0; i<nr; i++) {
struct iocb __user *user_iocb; struct iocb __user *user_iocb;
if (unlikely(__get_user(user_iocb, iocbpp + i))) { if (unlikely(get_user(user_iocb, iocbpp + i))) {
ret = -EFAULT; ret = -EFAULT;
break; break;
} }
ret = io_submit_one(ctx, user_iocb, compat); ret = io_submit_one(ctx, user_iocb, false);
if (ret) if (ret)
break; break;
} }
...@@ -1865,47 +1869,16 @@ static long do_io_submit(aio_context_t ctx_id, long nr, ...@@ -1865,47 +1869,16 @@ static long do_io_submit(aio_context_t ctx_id, long nr,
return i ? i : ret; return i ? i : ret;
} }
/* sys_io_submit:
* Queue the nr iocbs pointed to by iocbpp for processing. Returns
* the number of iocbs queued. May return -EINVAL if the aio_context
* specified by ctx_id is invalid, if nr is < 0, if the iocb at
* *iocbpp[0] is not properly initialized, if the operation specified
* is invalid for the file descriptor in the iocb. May fail with
* -EFAULT if any of the data structures point to invalid data. May
* fail with -EBADF if the file descriptor specified in the first
* iocb is invalid. May fail with -EAGAIN if insufficient resources
* are available to queue any iocbs. Will return 0 if nr is 0. Will
* fail with -ENOSYS if not implemented.
*/
SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
struct iocb __user * __user *, iocbpp)
{
return do_io_submit(ctx_id, nr, iocbpp, 0);
}
#ifdef CONFIG_COMPAT #ifdef CONFIG_COMPAT
static inline long
copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
{
compat_uptr_t uptr;
int i;
for (i = 0; i < nr; ++i) {
if (get_user(uptr, ptr32 + i))
return -EFAULT;
if (put_user(compat_ptr(uptr), ptr64 + i))
return -EFAULT;
}
return 0;
}
#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *)) #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id, COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
int, nr, u32 __user *, iocb) int, nr, compat_uptr_t __user *, iocbpp)
{ {
struct iocb __user * __user *iocb64; struct kioctx *ctx;
long ret; long ret = 0;
int i = 0;
struct blk_plug plug;
if (unlikely(nr < 0)) if (unlikely(nr < 0))
return -EINVAL; return -EINVAL;
...@@ -1913,11 +1886,29 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id, ...@@ -1913,11 +1886,29 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
if (nr > MAX_AIO_SUBMITS) if (nr > MAX_AIO_SUBMITS)
nr = MAX_AIO_SUBMITS; nr = MAX_AIO_SUBMITS;
iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64)); ctx = lookup_ioctx(ctx_id);
ret = copy_iocb(nr, iocb, iocb64); if (unlikely(!ctx)) {
if (!ret) pr_debug("EINVAL: invalid context id\n");
ret = do_io_submit(ctx_id, nr, iocb64, 1); return -EINVAL;
return ret; }
blk_start_plug(&plug);
for (i = 0; i < nr; i++) {
compat_uptr_t user_iocb;
if (unlikely(get_user(user_iocb, iocbpp + i))) {
ret = -EFAULT;
break;
}
ret = io_submit_one(ctx, compat_ptr(user_iocb), true);
if (ret)
break;
}
blk_finish_plug(&plug);
percpu_ref_put(&ctx->users);
return i ? i : ret;
} }
#endif #endif
......
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