diff options
| author | Konstantin Belousov <kib@FreeBSD.org> | 2022-12-28 18:13:01 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2023-01-20 03:21:23 +0000 |
| commit | e1d9d8fe64ee94f78d679235bb76b2a01068b4b2 (patch) | |
| tree | 30f1c6140f426cb5f25be254fa8fe8bfe31575f9 | |
| parent | 1610f04c9daceb5b4f2849e48d0021ecc975bb60 (diff) | |
Add descrip_check_write_mp() helper
Tested by: pho
(cherry picked from commit 37b9fb169686e867987c8a1a9868f81137b9df2b)
| -rw-r--r-- | sys/kern/kern_descrip.c | 25 | ||||
| -rw-r--r-- | sys/sys/filedesc.h | 2 |
2 files changed, 27 insertions, 0 deletions
diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c index ff999cc82f97..6b2d95d53db0 100644 --- a/sys/kern/kern_descrip.c +++ b/sys/kern/kern_descrip.c @@ -4238,6 +4238,31 @@ mountcheckdirs(struct vnode *olddp, struct vnode *newdp) vrele(olddp); } +int +descrip_check_write_mp(struct filedesc *fdp, struct mount *mp) +{ + struct file *fp; + struct vnode *vp; + int error, i, lastfile; + + error = 0; + FILEDESC_SLOCK(fdp); + lastfile = fdlastfile(fdp); + for (i = 0; i <= lastfile; i++) { + fp = fdp->fd_ofiles[i].fde_file; + if (fp->f_type != DTYPE_VNODE || + (atomic_load_int(&fp->f_flag) & FWRITE) == 0) + continue; + vp = fp->f_vnode; + if (vp->v_mount == mp) { + error = EDEADLK; + break; + } + } + FILEDESC_SUNLOCK(fdp); + return (error); +} + struct filedesc_to_leader * filedesc_to_leader_alloc(struct filedesc_to_leader *old, struct filedesc *fdp, struct proc *leader) diff --git a/sys/sys/filedesc.h b/sys/sys/filedesc.h index 345576438c67..5a4b3de33104 100644 --- a/sys/sys/filedesc.h +++ b/sys/sys/filedesc.h @@ -214,6 +214,7 @@ enum { #define falloc(td, resultfp, resultfd, flags) \ falloc_caps(td, resultfp, resultfd, flags, NULL) +struct mount; struct thread; static __inline void @@ -230,6 +231,7 @@ void filecaps_free(struct filecaps *fcaps); int closef(struct file *fp, struct thread *td); void closef_nothread(struct file *fp); +int descrip_check_write_mp(struct filedesc *fdp, struct mount *mp); int dupfdopen(struct thread *td, struct filedesc *fdp, int dfd, int mode, int openerror, int *indxp); int falloc_caps(struct thread *td, struct file **resultfp, int *resultfd, |