/*
* unlinked Set (formerly known as the "delete queue") Error Handling
*
* When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
* don't specify the name of the entry that we will be manipulating. We
* also fib and say that we won't be adding any new entries to the
* unlinked set, even though we might (this is to lower the minimum file
* size that can be deleted in a full filesystem). So on the small
* chance that the nlink list is using a fat zap (ie. has more than
* 2000 entries), we *may* not pre-read a block that's needed.
* Therefore it is remotely possible for some of the assertions
* regarding the unlinked set below to fail due to i/o error. On a
* nondebug system, this will result in the space being leaked.
*/
void
zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
char obj_name[17];
int error;
ASSERT(zp->z_unlinked);
ASSERT3U(zp->z_phys->zp_links, ==, 0);
error = zap_add(zfsvfs->z_os, zfsvfs->z_unlinkedobj,
zfs_unlinked_hexname(obj_name, zp->z_id), 8, 1, &zp->z_id, tx);
ASSERT3U(error, ==, 0);
}
/*
* unlinked Set (formerly known as the "delete queue") Error Handling
*
* When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
* don't specify the name of the entry that we will be manipulating. We
* also fib and say that we won't be adding any new entries to the
* unlinked set, even though we might (this is to lower the minimum file
* size that can be deleted in a full filesystem). So on the small
* chance that the nlink list is using a fat zap (ie. has more than
* 2000 entries), we *may* not pre-read a block that's needed.
* Therefore it is remotely possible for some of the assertions
* regarding the unlinked set below to fail due to i/o error. On a
* nondebug system, this will result in the space being leaked.
*/
void
zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
char obj_name[17];
int error;
#ifdef ZFS_DEBUG
znode_stalker(zp, N_zfs_nolink_add);
#endif
ASSERT(zp->z_unlinked);
ASSERT3U(zp->z_links, ==, 0);
error = zap_add(zfsvfs->z_os, zfsvfs->z_unlinkedobj,
zfs_unlinked_hexname(obj_name, zp->z_id), 8, 1, &zp->z_id, tx);
ASSERT3U(error, ==, 0);
}
void
zfs_rmnode(znode_t *zp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
objset_t *os = zfsvfs->z_os;
znode_t *xzp = NULL;
char obj_name[17];
dmu_tx_t *tx;
uint64_t acl_obj;
int error;
#ifndef __APPLE__
ASSERT(ZTOV(zp)->v_count == 0);
#endif /*!__APPLE__*/
ASSERT(zp->z_phys->zp_links == 0);
#ifdef ZFS_DEBUG
znode_stalker(zp, N_zfs_rmnode);
#endif
/*
* If this is an attribute directory, purge its contents.
*/
#ifdef __APPLE__
if (S_ISDIR(zp->z_phys->zp_mode) && (zp->z_phys->zp_flags & ZFS_XATTR))
#else
if (ZTOV(zp)->v_type == VDIR && (zp->z_phys->zp_flags & ZFS_XATTR))
#endif
{
if (zfs_purgedir(zp) != 0) {
/*
* Not enough space to delete some xattrs.
* Leave it on the unlinked set.
*/
return;
}
}
/*
* If the file has extended attributes, we're going to unlink
* the xattr dir.
*/
if (zp->z_phys->zp_xattr) {
error = zfs_zget(zfsvfs, zp->z_phys->zp_xattr, &xzp);
ASSERT(error == 0);
}
acl_obj = zp->z_phys->zp_acl.z_acl_extern_obj;
/*
* Set up the transaction.
*/
tx = dmu_tx_create(os);
dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
if (xzp) {
dmu_tx_hold_bonus(tx, xzp->z_id);
dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
}
if (acl_obj)
dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
/*
* Not enough space to delete the file. Leave it in the
* unlinked set, leaking it until the fs is remounted (at
* which point we'll call zfs_unlinked_drain() to process it).
*/
dmu_tx_abort(tx);
#ifdef __APPLE__
/*XXX NOEL: double check this path logic. see radar 5182217.
* This may be disturbing some of the evict logic
* and hence causing the NULL ptr drefs seen every great while
* in some of the test cases*/
zp->z_dbuf_held = 0;
ZFS_OBJ_HOLD_EXIT(zfsvfs, zp->z_id);
dmu_buf_rele(zp->z_dbuf, NULL);
#endif /* __APPLE__ */
return;
}
if (xzp) {
dmu_buf_will_dirty(xzp->z_dbuf, tx);
mutex_enter(&xzp->z_lock);
xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */
xzp->z_phys->zp_links = 0; /* no more links to it */
mutex_exit(&xzp->z_lock);
zfs_unlinked_add(xzp, tx);
}
/* Remove this znode from the unlinked set */
error = zap_remove(os, zfsvfs->z_unlinkedobj,
zfs_unlinked_hexname(obj_name, zp->z_id), tx);
ASSERT3U(error, ==, 0);
zfs_znode_delete(zp, tx);
dmu_tx_commit(tx);
if (xzp)
VN_RELE(ZTOV(xzp));
}
void
zfs_rmnode(znode_t *zp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
objset_t *os = zfsvfs->z_os;
znode_t *xzp = NULL;
char obj_name[17];
dmu_tx_t *tx;
uint64_t acl_obj;
int error;
ASSERT(ZTOV(zp)->v_count == 0);
ASSERT(zp->z_phys->zp_links == 0);
/*
* If this is an attribute directory, purge its contents.
*/
if (ZTOV(zp)->v_type == VDIR && (zp->z_phys->zp_flags & ZFS_XATTR)) {
if (zfs_purgedir(zp) != 0) {
/*
* Not enough space to delete some xattrs.
* Leave it on the unlinked set.
*/
return;
}
}
/*
* If the file has extended attributes, we're going to unlink
* the xattr dir.
*/
if (zp->z_phys->zp_xattr) {
error = zfs_zget(zfsvfs, zp->z_phys->zp_xattr, &xzp);
ASSERT(error == 0);
}
acl_obj = zp->z_phys->zp_acl.z_acl_extern_obj;
/*
* Set up the transaction.
*/
tx = dmu_tx_create(os);
dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
if (xzp) {
dmu_tx_hold_bonus(tx, xzp->z_id);
dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
}
if (acl_obj)
dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
/*
* Not enough space to delete the file. Leave it in the
* unlinked set, leaking it until the fs is remounted (at
* which point we'll call zfs_unlinked_drain() to process it).
*/
dmu_tx_abort(tx);
return;
}
if (xzp) {
dmu_buf_will_dirty(xzp->z_dbuf, tx);
mutex_enter(&xzp->z_lock);
xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */
xzp->z_phys->zp_links = 0; /* no more links to it */
mutex_exit(&xzp->z_lock);
zfs_unlinked_add(xzp, tx);
}
/* Remove this znode from the unlinked set */
error = zap_remove(os, zfsvfs->z_unlinkedobj,
zfs_unlinked_hexname(obj_name, zp->z_id), tx);
ASSERT3U(error, ==, 0);
zfs_znode_delete(zp, tx);
dmu_tx_commit(tx);
if (xzp)
VN_RELE(ZTOV(xzp));
}
