diff options
| -rw-r--r-- | sys/kern/vfs_mount.c | 5 | ||||
| -rw-r--r-- | sys/kern/vfs_subr.c | 55 | ||||
| -rw-r--r-- | sys/sys/mount.h | 10 |
3 files changed, 69 insertions, 1 deletions
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c index e9d3abe..f397842 100644 --- a/sys/kern/vfs_mount.c +++ b/sys/kern/vfs_mount.c @@ -481,6 +481,7 @@ vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, mac_mount_create(cred, mp); #endif arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); + TAILQ_INIT(&mp->mnt_uppers); return (mp); } @@ -514,6 +515,7 @@ vfs_mount_destroy(struct mount *mp) vprint("", vp); panic("unmount: dangling vnode"); } + KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); if (mp->mnt_nvnodelistsize != 0) panic("vfs_mount_destroy: nonzero nvnodelistsize"); if (mp->mnt_activevnodelistsize != 0) @@ -1275,7 +1277,8 @@ dounmount(mp, flags, td) } MNT_ILOCK(mp); - if (mp->mnt_kern_flag & MNTK_UNMOUNT) { + if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || + !TAILQ_EMPTY(&mp->mnt_uppers)) { MNT_IUNLOCK(mp); if (coveredvp) VOP_UNLOCK(coveredvp, 0); diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c index 631d3f2..06d16c0 100644 --- a/sys/kern/vfs_subr.c +++ b/sys/kern/vfs_subr.c @@ -2688,6 +2688,58 @@ vgone(struct vnode *vp) VI_UNLOCK(vp); } +static void +vgonel_reclaim_lowervp_vfs(struct mount *mp __unused, + struct vnode *lowervp __unused) +{ +} + +/* + * Notify upper mounts about reclaimed vnode. + */ +static void +vgonel_reclaim_lowervp(struct vnode *vp) +{ + static struct vfsops vgonel_vfsops = { + .vfs_reclaim_lowervp = vgonel_reclaim_lowervp_vfs + }; + struct mount *mp, *ump, *mmp; + + mp = vp->v_mount; + if (mp == NULL) + return; + + MNT_ILOCK(mp); + if (TAILQ_EMPTY(&mp->mnt_uppers)) + goto unlock; + MNT_IUNLOCK(mp); + mmp = malloc(sizeof(struct mount), M_TEMP, M_WAITOK | M_ZERO); + mmp->mnt_op = &vgonel_vfsops; + mmp->mnt_kern_flag |= MNTK_MARKER; + MNT_ILOCK(mp); + mp->mnt_kern_flag |= MNTK_VGONE_UPPER; + for (ump = TAILQ_FIRST(&mp->mnt_uppers); ump != NULL;) { + if ((ump->mnt_kern_flag & MNTK_MARKER) != 0) { + ump = TAILQ_NEXT(ump, mnt_upper_link); + continue; + } + TAILQ_INSERT_AFTER(&mp->mnt_uppers, ump, mmp, mnt_upper_link); + MNT_IUNLOCK(mp); + VFS_RECLAIM_LOWERVP(ump, vp); + MNT_ILOCK(mp); + ump = TAILQ_NEXT(mmp, mnt_upper_link); + TAILQ_REMOVE(&mp->mnt_uppers, mmp, mnt_upper_link); + } + free(mmp, M_TEMP); + mp->mnt_kern_flag &= ~MNTK_VGONE_UPPER; + if ((mp->mnt_kern_flag & MNTK_VGONE_WAITER) != 0) { + mp->mnt_kern_flag &= ~MNTK_VGONE_WAITER; + wakeup(&mp->mnt_uppers); + } +unlock: + MNT_IUNLOCK(mp); +} + /* * vgone, with the vp interlock held. */ @@ -2712,6 +2764,7 @@ vgonel(struct vnode *vp) if (vp->v_iflag & VI_DOOMED) return; vp->v_iflag |= VI_DOOMED; + /* * Check to see if the vnode is in use. If so, we have to call * VOP_CLOSE() and VOP_INACTIVE(). @@ -2719,6 +2772,8 @@ vgonel(struct vnode *vp) active = vp->v_usecount; oweinact = (vp->v_iflag & VI_OWEINACT); VI_UNLOCK(vp); + vgonel_reclaim_lowervp(vp); + /* * Clean out any buffers associated with the vnode. * If the flush fails, just toss the buffers. diff --git a/sys/sys/mount.h b/sys/sys/mount.h index 134b0c3..833ac0f 100644 --- a/sys/sys/mount.h +++ b/sys/sys/mount.h @@ -188,6 +188,8 @@ struct mount { #define mnt_endzero mnt_gjprovider char *mnt_gjprovider; /* gjournal provider name */ struct lock mnt_explock; /* vfs_export walkers lock */ + TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */ + TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/ }; /* @@ -373,6 +375,9 @@ void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp); #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads and writes. Filesystem shall properly handle i/o state on EFAULT. */ +#define MNTK_VGONE_UPPER 0x00000200 +#define MNTK_VGONE_WAITER 0x00000200 +#define MNTK_MARKER 0x00000400 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800 #define MNTK_NOASYNC 0x00800000 /* disable async */ #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ @@ -629,6 +634,7 @@ typedef int vfs_mount_t(struct mount *mp); typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op, struct sysctl_req *req); typedef void vfs_susp_clean_t(struct mount *mp); +typedef void vfs_reclaim_lowervp_t(struct mount *mp, struct vnode *lowervp); struct vfsops { vfs_mount_t *vfs_mount; @@ -646,6 +652,7 @@ struct vfsops { vfs_extattrctl_t *vfs_extattrctl; vfs_sysctl_t *vfs_sysctl; vfs_susp_clean_t *vfs_susp_clean; + vfs_reclaim_lowervp_t *vfs_reclaim_lowervp; }; vfs_statfs_t __vfs_statfs; @@ -671,6 +678,9 @@ vfs_statfs_t __vfs_statfs; #define VFS_SUSP_CLEAN(MP) \ ({if (*(MP)->mnt_op->vfs_susp_clean != NULL) \ (*(MP)->mnt_op->vfs_susp_clean)(MP); }) +#define VFS_RECLAIM_LOWERVP(MP, VP) \ + ({if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) \ + (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); }) #define VFS_NEEDSGIANT_(MP) \ ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0) |
