diff options
Diffstat (limited to 'sys/kern/vfs_aio.c')
| -rw-r--r-- | sys/kern/vfs_aio.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/sys/kern/vfs_aio.c b/sys/kern/vfs_aio.c index 3c9aa44..ead5e7c 100644 --- a/sys/kern/vfs_aio.c +++ b/sys/kern/vfs_aio.c @@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$"); #include <sys/syscall.h> #include <sys/sysent.h> #include <sys/sysctl.h> +#include <sys/syslog.h> #include <sys/sx.h> #include <sys/taskqueue.h> #include <sys/vnode.h> @@ -110,6 +111,11 @@ static int enable_aio_unsafe = 0; SYSCTL_INT(_vfs_aio, OID_AUTO, enable_unsafe, CTLFLAG_RW, &enable_aio_unsafe, 0, "Permit asynchronous IO on all file types, not just known-safe types"); +static unsigned int unsafe_warningcnt = 1; +SYSCTL_UINT(_vfs_aio, OID_AUTO, unsafe_warningcnt, CTLFLAG_RW, + &unsafe_warningcnt, 0, + "Warnings that will be triggered upon failed IO requests on unsafe files"); + static int max_aio_procs = MAX_AIO_PROCS; SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0, "Maximum number of kernel processes to use for handling async IO "); @@ -1664,7 +1670,10 @@ aio_queue_file(struct file *fp, struct kaiocb *job) 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; @@ -1685,8 +1694,20 @@ aio_queue_file(struct file *fp, struct kaiocb *job) 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)) { + counted_warning(&unsafe_warningcnt, + "is attempting to use unsafe AIO requests"); return (EOPNOTSUPP); + } if (opcode == LIO_SYNC) { AIO_LOCK(ki); |
