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authorAl Viro <viro@zeniv.linux.org.uk>2018-05-26 20:10:07 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2018-05-29 23:19:29 -0400
commit67ba049f94ebe49ed557e590dd243b6db45c9aff (patch)
treedaae1d99acb30a148b9fe7546d7894cd397f1029 /fs/aio.c
parent95af8496ac48263badf5b8dde5e06ef35aaace2b (diff)
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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: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/aio.c')
-rw-r--r--fs/aio.c99
1 files changed, 45 insertions, 54 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 90b46560f0ce..da859574c953 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1818,8 +1818,20 @@ out_put_req:
return ret;
}
-static long do_io_submit(aio_context_t ctx_id, long nr,
- struct iocb __user *__user *iocbpp, bool compat)
+/* 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)
{
struct kioctx *ctx;
long ret = 0;
@@ -1832,9 +1844,6 @@ static long do_io_submit(aio_context_t ctx_id, long nr,
if (unlikely(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);
if (unlikely(!ctx)) {
pr_debug("EINVAL: invalid context id\n");
@@ -1842,20 +1851,15 @@ static long do_io_submit(aio_context_t ctx_id, long nr,
}
blk_start_plug(&plug);
-
- /*
- * AKPM: should this return a partial result if some of the IOs were
- * successfully submitted?
- */
- for (i=0; i<nr; i++) {
+ for (i = 0; i < nr; i++) {
struct iocb __user *user_iocb;
- if (unlikely(__get_user(user_iocb, iocbpp + i))) {
+ if (unlikely(get_user(user_iocb, iocbpp + i))) {
ret = -EFAULT;
break;
}
- ret = io_submit_one(ctx, user_iocb, compat);
+ ret = io_submit_one(ctx, user_iocb, false);
if (ret)
break;
}
@@ -1865,47 +1869,16 @@ static long do_io_submit(aio_context_t ctx_id, long nr,
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
-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 *))
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;
- long ret;
+ struct kioctx *ctx;
+ long ret = 0;
+ int i = 0;
+ struct blk_plug plug;
if (unlikely(nr < 0))
return -EINVAL;
@@ -1913,11 +1886,29 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
if (nr > MAX_AIO_SUBMITS)
nr = MAX_AIO_SUBMITS;
- iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
- ret = copy_iocb(nr, iocb, iocb64);
- if (!ret)
- ret = do_io_submit(ctx_id, nr, iocb64, 1);
- return ret;
+ ctx = lookup_ioctx(ctx_id);
+ if (unlikely(!ctx)) {
+ pr_debug("EINVAL: invalid context id\n");
+ return -EINVAL;
+ }
+
+ 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