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In devfs_allocv(), rather than assigning 'td = curthread', assert that

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the caller passes in a td that is curthread, and consistently pass 'td'
into vget().  Remove some bogus logic that passed in td or curthread
conditional on td being non-NULL, which seems redundant in the face of
the earlier assignment of td to curthread if td is NULL.

In devfs_symlink(), cache the passed thread in 'td' so we don't have
to keep retrieving it from the 'ap' structure, and assert that td is
curthread (since we dereference it to get thread-local td_ucred).  Use
'td' in preference to curthread for later lockmgr calls, since they are
equal.
This commit is contained in:
rwatson 2004-07-22 17:03:14 +00:00
parent aafe09f586
commit 01be595ab3
1 changed files with 9 additions and 7 deletions
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16
sys/fs/devfs/devfs_vnops.c
View File

@ -125,12 +125,11 @@ devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, stru
struct vnode *vp;
struct cdev *dev;
if (td == NULL)
td = curthread; /* XXX */
KASSERT(td == curthread, ("devfs_allocv: td != curthread"));
loop:
vp = de->de_vnode;
if (vp != NULL) {
if (vget(vp, LK_EXCLUSIVE, td ? td : curthread))
if (vget(vp, LK_EXCLUSIVE, td))
goto loop;
*vpp = vp;
return (0);
@ -849,8 +848,11 @@ devfs_symlink(ap)
struct devfs_dirent *dd;
struct devfs_dirent *de;
struct devfs_mount *dmp;
struct thread *td;
error = suser(ap->a_cnp->cn_thread);
td = ap->a_cnp->cn_thread;
KASSERT(td == curthread, ("devfs_symlink: td != curthread"));
error = suser(td);
if (error)
return(error);
dmp = VFSTODEVFS(ap->a_dvp->v_mount);
@ -864,13 +866,13 @@ devfs_symlink(ap)
i = strlen(ap->a_target) + 1;
MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK);
bcopy(ap->a_target, de->de_symlink, i);
lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, td);
#ifdef MAC
mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
#endif
TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, 0);
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td);
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, td);
return (0);
}