Author: kib
Date: Thu Jul 21 17:07:06 2016
New Revision: 303154
URL: https://svnweb.freebsd.org/changeset/base/303154
Log:
Declare aio requests on files from local filesystems safe.
Two notes:
- I allow AIO on reclaimed vnodes, since it is deterministically terminated
fast.
- devfs mounts are marked as MNT_LOCAL, but device vnodes have type
VCHR, so the slow device io is not allowed.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D7273
Modified:
head/sys/kern/vfs_aio.c
Modified: head/sys/kern/vfs_aio.c
==============================================================================
--- head/sys/kern/vfs_aio.c Thu Jul 21 16:58:53 2016 (r303153)
+++ head/sys/kern/vfs_aio.c Thu Jul 21 17:07:06 2016 (r303154)
@@ -1664,7 +1664,10 @@ aio_queue_file(struct file *fp, struct k
struct aioliojob *lj;
struct kaioinfo *ki;
struct kaiocb *job2;
+ struct vnode *vp;
+ struct mount *mp;
int error, opcode;
+ bool safe;
lj = job->lio;
ki = job->userproc->p_aioinfo;
@@ -1685,7 +1688,16 @@ aio_queue_file(struct file *fp, struct k
goto done;
#endif
queueit:
- if (!enable_aio_unsafe)
+ safe = false;
+ if (fp->f_type == DTYPE_VNODE) {
+ vp = fp->f_vnode;
+ if (vp->v_type == VREG || vp->v_type == VDIR) {
+ mp = fp->f_vnode->v_mount;
+ if (mp == NULL || (mp->mnt_flag & MNT_LOCAL) != 0)
+ safe = true;
+ }
+ }
+ if (!(safe || enable_aio_unsafe))
return (EOPNOTSUPP);
if (opcode == LIO_SYNC) {
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