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MFC r268614:

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Use tmpfs_vn_get_ino_gen() to handle the races with reclaim in tmpfs
dotdot lookup.
This commit is contained in:
kib 2014-07-28 01:16:07 +00:00
parent 86ba2f30ea
commit d2764792a7
1 changed files with 13 additions and 13 deletions
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26
sys/fs/tmpfs/tmpfs_vnops.c
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@ -68,16 +68,23 @@ SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
__DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
"Times rename had to restart due to lock contention");
static int
tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags,
struct vnode **rvp)
{
return (tmpfs_alloc_vp(mp, arg, lkflags, rvp));
}
static int
tmpfs_lookup(struct vop_cachedlookup_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode **vpp = v->a_vpp;
struct componentname *cnp = v->a_cnp;
int error;
struct tmpfs_dirent *de;
struct tmpfs_node *dnode;
int error;
dnode = VP_TO_TMPFS_DIR(dvp);
*vpp = NULLVP;
@ -98,17 +105,10 @@ tmpfs_lookup(struct vop_cachedlookup_args *v)
goto out;
}
if (cnp->cn_flags & ISDOTDOT) {
int ltype = 0;
ltype = VOP_ISLOCKED(dvp);
vhold(dvp);
VOP_UNLOCK(dvp, 0);
/* Allocate a new vnode on the matching entry. */
error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
cnp->cn_lkflags, vpp);
vn_lock(dvp, ltype | LK_RETRY);
vdrop(dvp);
error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc,
dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp);
if (error != 0)
goto out;
} else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
VREF(dvp);
*vpp = dvp;