/*
* Unlink zp from dl, and mark zp for reaping if this was the last link.
* Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
* If 'reaped_ptr' is NULL, we put reaped znodes on the delete queue.
* If it's non-NULL, we use it to indicate whether the znode needs reaping,
* and it's the caller's job to do it.
*/
int
zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
int *reaped_ptr)
{
znode_t *dzp = dl->dl_dzp;
vnode_t *vp = ZTOV(zp);
int zp_is_dir = (vp->v_type == VDIR);
int reaped = 0;
int error;
dnlc_remove(ZTOV(dzp), dl->dl_name);
if (!(flag & ZRENAMING)) {
dmu_buf_will_dirty(zp->z_dbuf, tx);
if (vn_vfswlock(vp)) /* prevent new mounts on zp */
return (EBUSY);
if (vn_ismntpt(vp)) { /* don't remove mount point */
vn_vfsunlock(vp);
return (EBUSY);
}
mutex_enter(&zp->z_lock);
if (zp_is_dir && !zfs_dirempty(zp)) { /* dir not empty */
mutex_exit(&zp->z_lock);
vn_vfsunlock(vp);
return (EEXIST);
}
ASSERT(zp->z_phys->zp_links > zp_is_dir);
if (--zp->z_phys->zp_links == zp_is_dir) {
zp->z_reap = 1;
zp->z_phys->zp_links = 0;
reaped = 1;
} else {
zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
}
mutex_exit(&zp->z_lock);
vn_vfsunlock(vp);
}
dmu_buf_will_dirty(dzp->z_dbuf, tx);
mutex_enter(&dzp->z_lock);
dzp->z_phys->zp_size--; /* one dirent removed */
dzp->z_phys->zp_links -= zp_is_dir; /* ".." link from zp */
zfs_time_stamper_locked(dzp, CONTENT_MODIFIED, tx);
mutex_exit(&dzp->z_lock);
error = zap_remove(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name, tx);
ASSERT(error == 0);
if (reaped_ptr != NULL)
*reaped_ptr = reaped;
else if (reaped)
zfs_dq_add(zp, tx);
return (0);
}
/*
* Link zp into dl. Can only fail if zp has been unlinked.
*/
int
zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
{
znode_t *dzp = dl->dl_dzp;
#ifdef __APPLE__
uint64_t value;
/* OSX - don't access the vnode here since it might not be attached yet. */
int zp_is_dir = S_ISDIR(zp->z_phys->zp_mode);
#else
vnode_t *vp = ZTOV(zp);
uint64_t value;
int zp_is_dir = (vp->v_type == VDIR);
#endif
int error;
dmu_buf_will_dirty(zp->z_dbuf, tx);
mutex_enter(&zp->z_lock);
if (!(flag & ZRENAMING)) {
if (zp->z_unlinked) { /* no new links to unlinked zp */
ASSERT(!(flag & (ZNEW | ZEXISTS)));
mutex_exit(&zp->z_lock);
return (ENOENT);
}
zp->z_phys->zp_links++;
}
zp->z_phys->zp_parent = dzp->z_id; /* dzp is now zp's parent */
if (!(flag & ZNEW))
zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
mutex_exit(&zp->z_lock);
dmu_buf_will_dirty(dzp->z_dbuf, tx);
mutex_enter(&dzp->z_lock);
dzp->z_phys->zp_size++; /* one dirent added */
dzp->z_phys->zp_links += zp_is_dir; /* ".." link from zp */
zfs_time_stamper_locked(dzp, CONTENT_MODIFIED, tx);
mutex_exit(&dzp->z_lock);
value = zfs_dirent(zp);
error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name,
8, 1, &value, tx);
ASSERT(error == 0);
#ifndef __APPLE__
/* On Mac OS X, this is done up in VFS layer. */
dnlc_update(ZTOV(dzp), dl->dl_name, vp);
#endif
return (0);
}
/*
* Link zp into dl. Can only fail if zp has been unlinked.
*/
int
zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
{
znode_t *dzp = dl->dl_dzp;
vnode_t *vp = ZTOV(zp);
uint64_t value;
int zp_is_dir = (vp->v_type == VDIR);
int error;
dmu_buf_will_dirty(zp->z_dbuf, tx);
mutex_enter(&zp->z_lock);
if (!(flag & ZRENAMING)) {
if (zp->z_unlinked) { /* no new links to unlinked zp */
ASSERT(!(flag & (ZNEW | ZEXISTS)));
mutex_exit(&zp->z_lock);
return (ENOENT);
}
zp->z_phys->zp_links++;
}
zp->z_phys->zp_parent = dzp->z_id; /* dzp is now zp's parent */
if (!(flag & ZNEW))
zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
mutex_exit(&zp->z_lock);
dmu_buf_will_dirty(dzp->z_dbuf, tx);
mutex_enter(&dzp->z_lock);
dzp->z_phys->zp_size++; /* one dirent added */
dzp->z_phys->zp_links += zp_is_dir; /* ".." link from zp */
zfs_time_stamper_locked(dzp, CONTENT_MODIFIED, tx);
mutex_exit(&dzp->z_lock);
value = zfs_dirent(zp);
error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name,
8, 1, &value, tx);
ASSERT(error == 0);
dnlc_update(ZTOV(dzp), dl->dl_name, vp);
return (0);
}
/*
* Unlink zp from dl, and mark zp for deletion if this was the last link.
* Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
* If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
* If it's non-NULL, we use it to indicate whether the znode needs deletion,
* and it's the caller's job to do it.
*/
int
zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
boolean_t *unlinkedp)
{
znode_t *dzp = dl->dl_dzp;
vnode_t *vp = ZTOV(zp);
int zp_is_dir = (vp->v_type == VDIR);
boolean_t unlinked = B_FALSE;
int error;
dnlc_remove(ZTOV(dzp), dl->dl_name);
if (!(flag & ZRENAMING)) {
dmu_buf_will_dirty(zp->z_dbuf, tx);
if (vn_vfswlock(vp)) /* prevent new mounts on zp */
return (EBUSY);
if (vn_ismntpt(vp)) { /* don't remove mount point */
vn_vfsunlock(vp);
return (EBUSY);
}
mutex_enter(&zp->z_lock);
if (zp_is_dir && !zfs_dirempty(zp)) { /* dir not empty */
mutex_exit(&zp->z_lock);
vn_vfsunlock(vp);
return (ENOTEMPTY);
}
if (zp->z_phys->zp_links <= zp_is_dir) {
zfs_panic_recover("zfs: link count on vnode %p is %u, "
"should be at least %u", zp->z_vnode,
(int)zp->z_phys->zp_links,
zp_is_dir + 1);
zp->z_phys->zp_links = zp_is_dir + 1;
}
if (--zp->z_phys->zp_links == zp_is_dir) {
zp->z_unlinked = B_TRUE;
zp->z_phys->zp_links = 0;
unlinked = B_TRUE;
} else {
zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
}
mutex_exit(&zp->z_lock);
vn_vfsunlock(vp);
}
dmu_buf_will_dirty(dzp->z_dbuf, tx);
mutex_enter(&dzp->z_lock);
dzp->z_phys->zp_size--; /* one dirent removed */
dzp->z_phys->zp_links -= zp_is_dir; /* ".." link from zp */
zfs_time_stamper_locked(dzp, CONTENT_MODIFIED, tx);
mutex_exit(&dzp->z_lock);
if (zp->z_zfsvfs->z_norm) {
if (((zp->z_zfsvfs->z_case == ZFS_CASE_INSENSITIVE) &&
(flag & ZCIEXACT)) ||
((zp->z_zfsvfs->z_case == ZFS_CASE_MIXED) &&
!(flag & ZCILOOK)))
error = zap_remove_norm(zp->z_zfsvfs->z_os,
dzp->z_id, dl->dl_name, MT_EXACT, tx);
else
error = zap_remove_norm(zp->z_zfsvfs->z_os,
dzp->z_id, dl->dl_name, MT_FIRST, tx);
} else {
error = zap_remove(zp->z_zfsvfs->z_os,
dzp->z_id, dl->dl_name, tx);
}
ASSERT(error == 0);
if (unlinkedp != NULL)
*unlinkedp = unlinked;
else if (unlinked)
zfs_unlinked_add(zp, tx);
return (0);
}
/*
* Unlink zp from dl, and mark zp for deletion if this was the last link.
* Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
* If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
* If it's non-NULL, we use it to indicate whether the znode needs deletion,
* and it's the caller's job to do it.
*/
int
zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
boolean_t *unlinkedp)
{
znode_t *dzp = dl->dl_dzp;
vnode_t *vp = ZTOV(zp);
#ifdef __APPLE__
int zp_is_dir = S_ISDIR(zp->z_phys->zp_mode);
#else
int zp_is_dir = (vp->v_type == VDIR);
#endif
boolean_t unlinked = B_FALSE;
int error;
#ifndef __APPLE__
dnlc_remove(ZTOV(dzp), dl->dl_name);
#endif
if (!(flag & ZRENAMING)) {
dmu_buf_will_dirty(zp->z_dbuf, tx);
#ifdef __APPLE__
if (vp) {
#endif /* __APPLE__ */
if (vn_vfswlock(vp)) /* prevent new mounts on zp */
return (EBUSY);
if (vn_ismntpt(vp)) { /* don't remove mount point */
vn_vfsunlock(vp);
return (EBUSY);
}
#ifdef __APPLE__
} /* if (vp) */
#endif /* __APPLE__ */
mutex_enter(&zp->z_lock);
if (zp_is_dir && !zfs_dirempty(zp)) { /* dir not empty */
mutex_exit(&zp->z_lock);
#ifdef __APPLE__
return (ENOTEMPTY);
#else
vn_vfsunlock(vp);
return (EEXIST);
#endif
}
if (zp->z_phys->zp_links <= zp_is_dir) {
#ifndef __APPLE__
zfs_panic_recover("zfs: link count on %s is %u, "
"should be at least %u",
zp->z_vnode->v_path ? zp->z_vnode->v_path :
"<unknown>", (int)zp->z_phys->zp_links,
zp_is_dir + 1);
#endif
zp->z_phys->zp_links = zp_is_dir + 1;
}
if (--zp->z_phys->zp_links == zp_is_dir) {
zp->z_unlinked = B_TRUE;
zp->z_phys->zp_links = 0;
unlinked = B_TRUE;
} else {
zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
}
mutex_exit(&zp->z_lock);
#ifndef __APPLE__
vn_vfsunlock(vp);
#endif
}
dmu_buf_will_dirty(dzp->z_dbuf, tx);
mutex_enter(&dzp->z_lock);
dzp->z_phys->zp_size--; /* one dirent removed */
dzp->z_phys->zp_links -= zp_is_dir; /* ".." link from zp */
zfs_time_stamper_locked(dzp, CONTENT_MODIFIED, tx);
mutex_exit(&dzp->z_lock);
error = zap_remove(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name, tx);
ASSERT(error == 0);
if (unlinkedp != NULL)
*unlinkedp = unlinked;
else if (unlinked)
zfs_unlinked_add(zp, tx);
return (0);
}
