Ejemplo n.º 1
0
/*
 * NOTE: We don't combine the inode/chain lock because putting away an
 *       inode would otherwise confuse multiple lock holders of the inode.
 *
 *	 Shared locks are especially sensitive to having too many shared
 *	 lock counts (from the same thread) on certain paths which might
 *	 need to upgrade them.  Only one count of a shared lock can be
 *	 upgraded.
 */
hammer2_chain_t *
hammer2_inode_lock_sh(hammer2_inode_t *ip)
{
	hammer2_chain_t *chain;

	hammer2_inode_ref(ip);
again:
	ccms_thread_lock(&ip->topo_cst, CCMS_STATE_SHARED);

	chain = ip->chain;
	KKASSERT(chain != NULL);	/* for now */
	hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS |
				  HAMMER2_RESOLVE_SHARED);

	/*
	 * Resolve duplication races
	 */
	if (hammer2_chain_refactor_test(chain, 1)) {
		hammer2_chain_unlock(chain);
		ccms_thread_unlock(&ip->topo_cst);
		chain = hammer2_inode_lock_ex(ip);
		hammer2_inode_unlock_ex(ip, chain);
		goto again;
	}
	return (chain);
}
Ejemplo n.º 2
0
/*
 * NOTE: We don't combine the inode/chain lock because putting away an
 *       inode would otherwise confuse multiple lock holders of the inode.
 *
 *	 Shared locks are especially sensitive to having too many shared
 *	 lock counts (from the same thread) on certain paths which might
 *	 need to upgrade them.  Only one count of a shared lock can be
 *	 upgraded.
 */
hammer2_chain_t *
hammer2_inode_lock_sh(hammer2_inode_t *ip)
{
	hammer2_chain_t *chain;

	hammer2_inode_ref(ip);
	for (;;) {
		ccms_thread_lock(&ip->topo_cst, CCMS_STATE_SHARED);

		chain = ip->chain;
		KKASSERT(chain != NULL);	/* for now */
		hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS |
					  HAMMER2_RESOLVE_SHARED);

		/*
		 * Resolve duplication races, resolve hardlinks by giving
		 * up and cycling an exclusive lock.
		 */
		if ((chain->flags & HAMMER2_CHAIN_DUPLICATED) == 0 &&
		    chain->data->ipdata.type != HAMMER2_OBJTYPE_HARDLINK) {
			break;
		}
		hammer2_chain_unlock(chain);
		ccms_thread_unlock(&ip->topo_cst);
		chain = hammer2_inode_lock_ex(ip);
		hammer2_inode_unlock_ex(ip, chain);
	}
	return (chain);
}
Ejemplo n.º 3
0
/*
 * The caller presents a locked *chainp pointing to a HAMMER2_BREF_TYPE_INODE
 * with an obj_type of HAMMER2_OBJTYPE_HARDLINK.  This routine will gobble
 * the *chainp and return a new locked *chainp representing the file target
 * (the original *chainp will be unlocked).
 *
 * When a match is found the chain representing the original HARDLINK
 * will be returned in *ochainp with a ref, but not locked.
 *
 * When no match is found *chainp is set to NULL and EIO is returned.
 * (*ochainp) will still be set to the original chain with a ref but not
 * locked.
 */
int
hammer2_hardlink_find(hammer2_inode_t *dip, hammer2_chain_t **chainp,
		      hammer2_chain_t **ochainp)
{
	hammer2_chain_t *chain = *chainp;
	hammer2_chain_t *parent;
	hammer2_inode_t *ip;
	hammer2_inode_t *pip;
	hammer2_key_t key_dummy;
	hammer2_key_t lhc;
	int cache_index = -1;

	pip = dip;
	hammer2_inode_ref(pip);		/* for loop */
	hammer2_chain_ref(chain);	/* for (*ochainp) */
	*ochainp = chain;

	/*
	 * Locate the hardlink.  pip is referenced and not locked,
	 * ipp.
	 *
	 * chain is reused.
	 */
	lhc = chain->data->ipdata.inum;
	hammer2_chain_unlock(chain);
	chain = NULL;

	while ((ip = pip) != NULL) {
		parent = hammer2_inode_lock_ex(ip);
		hammer2_inode_drop(ip);			/* loop */
		KKASSERT(parent->bref.type == HAMMER2_BREF_TYPE_INODE);
		chain = hammer2_chain_lookup(&parent, &key_dummy,
					     lhc, lhc, &cache_index, 0);
		hammer2_chain_lookup_done(parent);	/* discard parent */
		if (chain)
			break;
		pip = ip->pip;		/* safe, ip held locked */
		if (pip)
			hammer2_inode_ref(pip);		/* loop */
		hammer2_inode_unlock_ex(ip, NULL);
	}

	/*
	 * chain is locked, ip is locked.  Unlock ip, return the locked
	 * chain.  *ipp is already set w/a ref count and not locked.
	 *
	 * (parent is already unlocked).
	 */
	if (ip)
		hammer2_inode_unlock_ex(ip, NULL);
	*chainp = chain;
	if (chain) {
		KKASSERT(chain->bref.type == HAMMER2_BREF_TYPE_INODE);
		/* already locked */
		return (0);
	} else {
		return (EIO);
	}
}
Ejemplo n.º 4
0
/*
 * If an open file is unlinked H2 needs to retain the file in the topology
 * to ensure that its backing store is not recovered by the bulk free scan.
 * This also allows us to avoid having to special-case the CHAIN_DELETED flag.
 *
 * To do this the file is moved to a hidden directory in the PFS root and
 * renamed.  The hidden directory must be created if it does not exist.
 */
static
void
hammer2_inode_move_to_hidden(hammer2_trans_t *trans, hammer2_chain_t **chainp,
			     hammer2_tid_t inum)
{
	hammer2_chain_t *chain;
	hammer2_chain_t *dchain;
	hammer2_pfsmount_t *pmp;
	int error;

	chain = *chainp;
	pmp = chain->pmp;
	KKASSERT(pmp != NULL);
	KKASSERT(pmp->ihidden != NULL);
	hammer2_chain_delete(trans, chain, 0);

	dchain = hammer2_inode_lock_ex(pmp->ihidden);
        error = hammer2_inode_connect(trans, chainp, 0,
                                      pmp->ihidden, &dchain,
				      NULL, 0, inum);
	hammer2_inode_unlock_ex(pmp->ihidden, dchain);
	KKASSERT(error == 0);
}
Ejemplo n.º 5
0
/*
 * Create a new inode in the specified directory using the vattr to
 * figure out the type of inode.
 *
 * If no error occurs the new inode with its chain locked is returned in
 * *nipp, otherwise an error is returned and *nipp is set to NULL.
 *
 * If vap and/or cred are NULL the related fields are not set and the
 * inode type defaults to a directory.  This is used when creating PFSs
 * under the super-root, so the inode number is set to 1 in this case.
 *
 * dip is not locked on entry.
 */
hammer2_inode_t *
hammer2_inode_create(hammer2_trans_t *trans, hammer2_inode_t *dip,
		     struct vattr *vap, struct ucred *cred,
		     const uint8_t *name, size_t name_len,
		     hammer2_chain_t **chainp, int *errorp)
{
	hammer2_inode_data_t *dipdata;
	hammer2_inode_data_t *nipdata;
	hammer2_chain_t *chain;
	hammer2_chain_t *parent;
	hammer2_inode_t *nip;
	hammer2_key_t key_dummy;
	hammer2_key_t lhc;
	int error;
	uid_t xuid;
	uuid_t dip_uid;
	uuid_t dip_gid;
	uint32_t dip_mode;
	uint8_t dip_algo;
	int cache_index = -1;

	lhc = hammer2_dirhash(name, name_len);
	*errorp = 0;

	/*
	 * Locate the inode or indirect block to create the new
	 * entry in.  At the same time check for key collisions
	 * and iterate until we don't get one.
	 *
	 * NOTE: hidden inodes do not have iterators.
	 */
retry:
	parent = hammer2_inode_lock_ex(dip);
	dipdata = &dip->chain->data->ipdata;
	dip_uid = dipdata->uid;
	dip_gid = dipdata->gid;
	dip_mode = dipdata->mode;
	dip_algo = dipdata->comp_algo;

	error = 0;
	while (error == 0) {
		chain = hammer2_chain_lookup(&parent, &key_dummy,
					     lhc, lhc, &cache_index, 0);
		if (chain == NULL)
			break;
		if ((lhc & HAMMER2_DIRHASH_VISIBLE) == 0)
			error = ENOSPC;
		if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK)
			error = ENOSPC;
		hammer2_chain_unlock(chain);
		chain = NULL;
		++lhc;
	}

	if (error == 0) {
		error = hammer2_chain_create(trans, &parent, &chain,
					     lhc, 0,
					     HAMMER2_BREF_TYPE_INODE,
					     HAMMER2_INODE_BYTES);
	}

	/*
	 * Cleanup and handle retries.
	 */
	if (error == EAGAIN) {
		hammer2_chain_ref(parent);
		hammer2_inode_unlock_ex(dip, parent);
		hammer2_chain_wait(parent);
		hammer2_chain_drop(parent);
		goto retry;
	}
	hammer2_inode_unlock_ex(dip, parent);

	if (error) {
		KKASSERT(chain == NULL);
		*errorp = error;
		return (NULL);
	}

	/*
	 * Set up the new inode.
	 *
	 * NOTE: *_get() integrates chain's lock into the inode lock.
	 *
	 * NOTE: Only one new inode can currently be created per
	 *	 transaction.  If the need arises we can adjust
	 *	 hammer2_trans_init() to allow more.
	 *
	 * NOTE: nipdata will have chain's blockset data.
	 */
	chain->data->ipdata.inum = trans->inode_tid;
	nip = hammer2_inode_get(dip->pmp, dip, chain);
	nipdata = &chain->data->ipdata;

	if (vap) {
		KKASSERT(trans->inodes_created == 0);
		nipdata->type = hammer2_get_obj_type(vap->va_type);
		nipdata->inum = trans->inode_tid;
		++trans->inodes_created;

		switch (nipdata->type) {
		case HAMMER2_OBJTYPE_CDEV:
		case HAMMER2_OBJTYPE_BDEV:
			nipdata->rmajor = vap->va_rmajor;
			nipdata->rminor = vap->va_rminor;
			break;
		default:
			break;
		}
	} else {
		nipdata->type = HAMMER2_OBJTYPE_DIRECTORY;
		nipdata->inum = 1;
	}
	
	/* Inherit parent's inode compression mode. */
	nip->comp_heuristic = 0;
	nipdata->comp_algo = dip_algo;
	nipdata->version = HAMMER2_INODE_VERSION_ONE;
	hammer2_update_time(&nipdata->ctime);
	nipdata->mtime = nipdata->ctime;
	if (vap)
		nipdata->mode = vap->va_mode;
	nipdata->nlinks = 1;
	if (vap) {
		if (dip && dip->pmp) {
			xuid = hammer2_to_unix_xid(&dip_uid);
			xuid = vop_helper_create_uid(dip->pmp->mp,
						     dip_mode,
						     xuid,
						     cred,
						     &vap->va_mode);
		} else {
			/* super-root has no dip and/or pmp */
			xuid = 0;
		}
		if (vap->va_vaflags & VA_UID_UUID_VALID)
			nipdata->uid = vap->va_uid_uuid;
		else if (vap->va_uid != (uid_t)VNOVAL)
			hammer2_guid_to_uuid(&nipdata->uid, vap->va_uid);
		else
			hammer2_guid_to_uuid(&nipdata->uid, xuid);

		if (vap->va_vaflags & VA_GID_UUID_VALID)
			nipdata->gid = vap->va_gid_uuid;
		else if (vap->va_gid != (gid_t)VNOVAL)
			hammer2_guid_to_uuid(&nipdata->gid, vap->va_gid);
		else if (dip)
			nipdata->gid = dip_gid;
	}

	/*
	 * Regular files and softlinks allow a small amount of data to be
	 * directly embedded in the inode.  This flag will be cleared if
	 * the size is extended past the embedded limit.
	 */
	if (nipdata->type == HAMMER2_OBJTYPE_REGFILE ||
	    nipdata->type == HAMMER2_OBJTYPE_SOFTLINK) {
		nipdata->op_flags |= HAMMER2_OPFLAG_DIRECTDATA;
	}

	KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
	bcopy(name, nipdata->filename, name_len);
	nipdata->name_key = lhc;
	nipdata->name_len = name_len;
	*chainp = chain;

	return (nip);
}
Ejemplo n.º 6
0
/*
 * This is called from the mount code to initialize pmp->ihidden
 */
void
hammer2_inode_install_hidden(hammer2_pfsmount_t *pmp)
{
	hammer2_trans_t trans;
	hammer2_chain_t *parent;
	hammer2_chain_t *chain;
	hammer2_chain_t *scan;
	hammer2_inode_data_t *ipdata;
	hammer2_key_t key_dummy;
	hammer2_key_t key_next;
	int cache_index;
	int error;
	int count;

	if (pmp->ihidden)
		return;

	/*
	 * Find the hidden directory
	 */
	bzero(&key_dummy, sizeof(key_dummy));
	hammer2_trans_init(&trans, pmp, NULL, 0);

	parent = hammer2_inode_lock_ex(pmp->iroot);
	chain = hammer2_chain_lookup(&parent, &key_dummy,
				     HAMMER2_INODE_HIDDENDIR,
				     HAMMER2_INODE_HIDDENDIR,
				     &cache_index, 0);
	if (chain) {
		pmp->ihidden = hammer2_inode_get(pmp, pmp->iroot, chain);
		hammer2_inode_ref(pmp->ihidden);

		/*
		 * Remove any unlinked files which were left open as-of
		 * any system crash.
		 */
		count = 0;
		scan = hammer2_chain_lookup(&chain, &key_next,
					    0, HAMMER2_MAX_TID,
					    &cache_index,
					    HAMMER2_LOOKUP_NODATA);
		while (scan) {
			if (scan->bref.type == HAMMER2_BREF_TYPE_INODE) {
				hammer2_chain_delete(&trans, scan, 0);
				++count;
			}
			scan = hammer2_chain_next(&chain, scan, &key_next,
						   0, HAMMER2_MAX_TID,
						   &cache_index,
						   HAMMER2_LOOKUP_NODATA);
		}

		hammer2_inode_unlock_ex(pmp->ihidden, chain);
		hammer2_inode_unlock_ex(pmp->iroot, parent);
		hammer2_trans_done(&trans);
		kprintf("hammer2: PFS loaded hidden dir, "
			"removed %d dead entries\n", count);
		return;
	}

	/*
	 * Create the hidden directory
	 */
	error = hammer2_chain_create(&trans, &parent, &chain,
				     HAMMER2_INODE_HIDDENDIR, 0,
				     HAMMER2_BREF_TYPE_INODE,
				     HAMMER2_INODE_BYTES);
	hammer2_inode_unlock_ex(pmp->iroot, parent);
	hammer2_chain_modify(&trans, &chain, 0);
	ipdata = &chain->data->ipdata;
	ipdata->type = HAMMER2_OBJTYPE_DIRECTORY;
	ipdata->inum = HAMMER2_INODE_HIDDENDIR;
	ipdata->nlinks = 1;
	kprintf("hammer2: PFS root missing hidden directory, creating\n");

	pmp->ihidden = hammer2_inode_get(pmp, pmp->iroot, chain);
	hammer2_inode_ref(pmp->ihidden);
	hammer2_inode_unlock_ex(pmp->ihidden, chain);
	hammer2_trans_done(&trans);
}
Ejemplo n.º 7
0
/*
 * Unlink the file from the specified directory inode.  The directory inode
 * does not need to be locked.
 *
 * isdir determines whether a directory/non-directory check should be made.
 * No check is made if isdir is set to -1.
 *
 * isopen specifies whether special unlink-with-open-descriptor handling
 * must be performed.  If set to -1 the caller is deleting a PFS and we
 * check whether the chain is mounted or not (chain->pmp != NULL).  1 is
 * implied if it is mounted.
 *
 * If isopen is 1 and nlinks drops to 0 this function must move the chain
 * to a special hidden directory until last-close occurs on the file.
 *
 * NOTE!  The underlying file can still be active with open descriptors
 *	  or if the chain is being manually held (e.g. for rename).
 *
 *	  The caller is responsible for fixing up ip->chain if e.g. a
 *	  rename occurs (see chain_duplicate()).
 */
int
hammer2_unlink_file(hammer2_trans_t *trans, hammer2_inode_t *dip,
		    const uint8_t *name, size_t name_len,
		    int isdir, int *hlinkp, struct nchandle *nch)
{
	hammer2_inode_data_t *ipdata;
	hammer2_chain_t *parent;
	hammer2_chain_t *ochain;
	hammer2_chain_t *chain;
	hammer2_chain_t *dparent;
	hammer2_chain_t *dchain;
	hammer2_key_t key_dummy;
	hammer2_key_t key_next;
	hammer2_key_t lhc;
	int error;
	int cache_index = -1;
	uint8_t type;

	error = 0;
	ochain = NULL;
	lhc = hammer2_dirhash(name, name_len);

	/*
	 * Search for the filename in the directory
	 */
	if (hlinkp)
		*hlinkp = 0;
	parent = hammer2_inode_lock_ex(dip);
	chain = hammer2_chain_lookup(&parent, &key_next,
				     lhc, lhc + HAMMER2_DIRHASH_LOMASK,
				     &cache_index, 0);
	while (chain) {
		if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
		    name_len == chain->data->ipdata.name_len &&
		    bcmp(name, chain->data->ipdata.filename, name_len) == 0) {
			break;
		}
		chain = hammer2_chain_next(&parent, chain, &key_next,
					   key_next,
					   lhc + HAMMER2_DIRHASH_LOMASK,
					   &cache_index, 0);
	}
	hammer2_inode_unlock_ex(dip, NULL);	/* retain parent */

	/*
	 * Not found or wrong type (isdir < 0 disables the type check).
	 * If a hardlink pointer, type checks use the hardlink target.
	 */
	if (chain == NULL) {
		error = ENOENT;
		goto done;
	}
	if ((type = chain->data->ipdata.type) == HAMMER2_OBJTYPE_HARDLINK) {
		if (hlinkp)
			*hlinkp = 1;
		type = chain->data->ipdata.target_type;
	}

	if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 0) {
		error = ENOTDIR;
		goto done;
	}
	if (type != HAMMER2_OBJTYPE_DIRECTORY && isdir >= 1) {
		error = EISDIR;
		goto done;
	}

	/*
	 * Hardlink must be resolved.  We can't hold the parent locked
	 * while we do this or we could deadlock.
	 *
	 * On success chain will be adjusted to point at the hardlink target
	 * and ochain will point to the hardlink pointer in the original
	 * directory.  Otherwise chain remains pointing to the original.
	 */
	if (chain->data->ipdata.type == HAMMER2_OBJTYPE_HARDLINK) {
		hammer2_chain_unlock(parent);
		parent = NULL;
		error = hammer2_hardlink_find(dip, &chain, &ochain);
	}

	/*
	 * If this is a directory the directory must be empty.  However, if
	 * isdir < 0 we are doing a rename and the directory does not have
	 * to be empty, and if isdir > 1 we are deleting a PFS/snapshot
	 * and the directory does not have to be empty.
	 *
	 * NOTE: We check the full key range here which covers both visible
	 *	 and invisible entries.  Theoretically there should be no
	 *	 invisible (hardlink target) entries if there are no visible
	 *	 entries.
	 */
	if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 1) {
		dparent = hammer2_chain_lookup_init(chain, 0);
		dchain = hammer2_chain_lookup(&dparent, &key_dummy,
					      0, (hammer2_key_t)-1,
					      &cache_index,
					      HAMMER2_LOOKUP_NODATA);
		if (dchain) {
			hammer2_chain_unlock(dchain);
			hammer2_chain_lookup_done(dparent);
			error = ENOTEMPTY;
			goto done;
		}
		hammer2_chain_lookup_done(dparent);
		dparent = NULL;
		/* dchain NULL */
	}

	/*
	 * Ok, we can now unlink the chain.  We always decrement nlinks even
	 * if the entry can be deleted in case someone has the file open and
	 * does an fstat().
	 *
	 * The chain itself will no longer be in the on-media topology but
	 * can still be flushed to the media (e.g. if an open descriptor
	 * remains).  When the last vnode/ip ref goes away the chain will
	 * be marked unmodified, avoiding any further (now unnecesary) I/O.
	 *
	 * A non-NULL ochain indicates a hardlink.
	 */
	if (ochain) {
		/*
		 * Delete the original hardlink pointer unconditionally.
		 * (any open descriptors will migrate to the hardlink
		 * target and have no affect on this operation).
		 *
		 * NOTE: parent from above is NULL when ochain != NULL
		 *	 so we can reuse it.
		 */
		hammer2_chain_lock(ochain, HAMMER2_RESOLVE_ALWAYS);
		hammer2_chain_delete(trans, ochain, 0);
		hammer2_chain_unlock(ochain);
	}

	/*
	 * Decrement nlinks on the hardlink target (or original file if
	 * there it was not hardlinked).  Delete the target when nlinks
	 * reaches 0 with special handling if (isopen) is set.
	 *
	 * NOTE! In DragonFly the vnops function calls cache_unlink() after
	 *	 calling us here to clean out the namecache association,
	 *	 (which does not represent a ref for the open-test), and to
	 *	 force finalization of the vnode if/when the last ref gets
	 *	 dropped.
	 *
	 * NOTE! Files are unlinked by rename and then relinked.  nch will be
	 *	 passed as NULL in this situation.  hammer2_inode_connect()
	 *	 will bump nlinks.
	 */
	KKASSERT(chain != NULL);
	hammer2_chain_modify(trans, &chain, 0);
	ipdata = &chain->data->ipdata;
	--ipdata->nlinks;
	if ((int64_t)ipdata->nlinks < 0)	/* XXX debugging */
		ipdata->nlinks = 0;
	if (ipdata->nlinks == 0) {
		if ((chain->flags & HAMMER2_CHAIN_PFSROOT) && chain->pmp) {
			error = EINVAL;
			kprintf("hammer2: PFS \"%s\" cannot be deleted "
				"while still mounted\n",
				ipdata->filename);
			goto done;
		}
		if (nch && cache_isopen(nch)) {
			kprintf("WARNING: unlinking open file\n");
			atomic_set_int(&chain->flags, HAMMER2_CHAIN_UNLINKED);
			hammer2_inode_move_to_hidden(trans, &chain,
						     ipdata->inum);
		} else {
			hammer2_chain_delete(trans, chain, 0);
		}
	}
	error = 0;
done:
	if (chain)
		hammer2_chain_unlock(chain);
	if (parent)
		hammer2_chain_lookup_done(parent);
	if (ochain)
		hammer2_chain_drop(ochain);

	return error;
}
Ejemplo n.º 8
0
/*
 * Unlink the file from the specified directory inode.  The directory inode
 * does not need to be locked.
 *
 * isdir determines whether a directory/non-directory check should be made.
 * No check is made if isdir is set to -1.
 *
 * NOTE!  This function does not prevent the underlying file from still
 *	  being used if it has other refs (such as from an inode, or if it's
 *	  chain is manually held).  However, the caller is responsible for
 *	  fixing up ip->chain if e.g. a rename occurs (see chain_duplicate()).
 */
int
hammer2_unlink_file(hammer2_trans_t *trans, hammer2_inode_t *dip,
		    const uint8_t *name, size_t name_len,
		    int isdir, int *hlinkp)
{
	hammer2_inode_data_t *ipdata;
	hammer2_chain_t *parent;
	hammer2_chain_t *ochain;
	hammer2_chain_t *chain;
	hammer2_chain_t *dparent;
	hammer2_chain_t *dchain;
	hammer2_key_t lhc;
	int error;
	uint8_t type;

	error = 0;
	ochain = NULL;
	lhc = hammer2_dirhash(name, name_len);

	/*
	 * Search for the filename in the directory
	 */
	if (hlinkp)
		*hlinkp = 0;
	parent = hammer2_inode_lock_ex(dip);
	chain = hammer2_chain_lookup(&parent,
				     lhc, lhc + HAMMER2_DIRHASH_LOMASK,
				     0);
	while (chain) {
		if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
		    name_len == chain->data->ipdata.name_len &&
		    bcmp(name, chain->data->ipdata.filename, name_len) == 0) {
			break;
		}
		chain = hammer2_chain_next(&parent, chain,
					   lhc, lhc + HAMMER2_DIRHASH_LOMASK,
					   0);
	}
	hammer2_inode_unlock_ex(dip, NULL);	/* retain parent */

	/*
	 * Not found or wrong type (isdir < 0 disables the type check).
	 * If a hardlink pointer, type checks use the hardlink target.
	 */
	if (chain == NULL) {
		error = ENOENT;
		goto done;
	}
	if ((type = chain->data->ipdata.type) == HAMMER2_OBJTYPE_HARDLINK) {
		if (hlinkp)
			*hlinkp = 1;
		type = chain->data->ipdata.target_type;
	}

	if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 0) {
		error = ENOTDIR;
		goto done;
	}
	if (type != HAMMER2_OBJTYPE_DIRECTORY && isdir >= 1) {
		error = EISDIR;
		goto done;
	}

	/*
	 * Hardlink must be resolved.  We can't hold parent locked while we
	 * do this or we could deadlock.
	 *
	 * On success chain will be adjusted to point at the hardlink target
	 * and ochain will point to the hardlink pointer in the original
	 * directory.  Otherwise chain remains pointing to the original.
	 */
	if (chain->data->ipdata.type == HAMMER2_OBJTYPE_HARDLINK) {
		hammer2_chain_unlock(parent);
		parent = NULL;
		error = hammer2_hardlink_find(dip, &chain, &ochain);
	}

	/*
	 * If this is a directory the directory must be empty.  However, if
	 * isdir < 0 we are doing a rename and the directory does not have
	 * to be empty, and if isdir > 1 we are deleting a PFS/snapshot
	 * and the directory does not have to be empty.
	 *
	 * NOTE: We check the full key range here which covers both visible
	 *	 and invisible entries.  Theoretically there should be no
	 *	 invisible (hardlink target) entries if there are no visible
	 *	 entries.
	 */
	if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 1) {
		dparent = hammer2_chain_lookup_init(chain, 0);
		dchain = hammer2_chain_lookup(&dparent,
					      0, (hammer2_key_t)-1,
					      HAMMER2_LOOKUP_NODATA);
		if (dchain) {
			hammer2_chain_unlock(dchain);
			hammer2_chain_lookup_done(dparent);
			error = ENOTEMPTY;
			goto done;
		}
		hammer2_chain_lookup_done(dparent);
		dparent = NULL;
		/* dchain NULL */
	}

	/*
	 * Ok, we can now unlink the chain.  We always decrement nlinks even
	 * if the entry can be deleted in case someone has the file open and
	 * does an fstat().
	 *
	 * The chain itself will no longer be in the on-media topology but
	 * can still be flushed to the media (e.g. if an open descriptor
	 * remains).  When the last vnode/ip ref goes away the chain will
	 * be marked unmodified, avoiding any further (now unnecesary) I/O.
	 *
	 * A non-NULL ochain indicates a hardlink.
	 */
	if (ochain) {
		/*
		 * Delete the original hardlink pointer.
		 *
		 * NOTE: parent from above is NULL when ochain != NULL
		 *	 so we can reuse it.
		 */
		hammer2_chain_lock(ochain, HAMMER2_RESOLVE_ALWAYS);
		hammer2_chain_delete(trans, ochain);
		hammer2_chain_unlock(ochain);

		/*
		 * Then decrement nlinks on hardlink target, deleting
		 * the target when nlinks drops to 0.
		 */
		hammer2_chain_modify(trans, &chain, 0);
		--chain->data->ipdata.nlinks;
		if (chain->data->ipdata.nlinks == 0)
			hammer2_chain_delete(trans, chain);
	} else {
		/*
		 * Otherwise this was not a hardlink and we can just
		 * remove the entry and decrement nlinks.
		 *
		 * NOTE: *_get() integrates chain's lock into the inode lock.
		 */
		hammer2_chain_modify(trans, &chain, 0);
		ipdata = &chain->data->ipdata;
		--ipdata->nlinks;
		hammer2_chain_delete(trans, chain);
	}

	error = 0;
done:
	if (chain)
		hammer2_chain_unlock(chain);
	if (parent)
		hammer2_chain_lookup_done(parent);
	if (ochain)
		hammer2_chain_drop(ochain);

	return error;
}
Ejemplo n.º 9
0
/*
 * Consolidate for hard link creation.  This moves the specified terminal
 * hardlink inode to a directory common to its current directory and tdip
 * if necessary, replacing *ipp with the new inode chain element and
 * modifying the original inode chain element to OBJTYPE_HARDLINK.
 *
 * If the original inode chain element was a prior incarnation of a hidden
 * inode it can simply be deleted instead of converted.
 *
 * (*ipp)'s nlinks field is locked on entry and the new (*ipp)'s nlinks
 * field will be locked on return (with the original's unlocked).
 *
 * The link count is bumped if requested.
 */
int
hammer2_hardlink_consolidate(hammer2_inode_t **ipp, hammer2_inode_t *tdip)
{
	hammer2_mount_t *hmp;
	hammer2_inode_t *oip = *ipp;
	hammer2_inode_t *nip = NULL;
	hammer2_inode_t *fdip;
	hammer2_chain_t *parent;
	int error;

	hmp = tdip->hmp;

	if (hammer2_hardlink_enable < 0)
		return (0);
	if (hammer2_hardlink_enable == 0)
	/*XXX	return (ENOTSUP);
*/

	/*
	 * Find the common parent directory
	 */
	fdip = oip->pip;
	while (fdip->depth > tdip->depth) {
		fdip = fdip->pip;
		KKASSERT(fdip != NULL);
	}
	while (tdip->depth > fdip->depth) {
		tdip = tdip->pip;
		KKASSERT(tdip != NULL);
	}
	while (fdip != tdip) {
		fdip = fdip->pip;
		tdip = tdip->pip;
		KKASSERT(fdip != NULL);
		KKASSERT(tdip != NULL);
	}

	/*
	 * Nothing to do (except bump the link count) if the hardlink has
	 * already been consolidated in the correct place.
	 */
	if (oip->pip == fdip &&
	    (oip->ip_data.name_key & HAMMER2_DIRHASH_VISIBLE) == 0) {
		kprintf("hardlink already consolidated correctly\n");
		nip = oip;
		hammer2_inode_lock_ex(nip);
		hammer2_chain_modify(hmp, &nip->chain, 0);
		++nip->ip_data.nlinks;
		hammer2_inode_unlock_ex(nip);
		return (0);
	}

	/*
	 * Create a hidden inode directory entry in the parent, copying
	 * (*oip)'s state.  Then replace oip with OBJTYPE_HARDLINK.
	 *
	 * The duplication function will either flush or move any chains
	 * under oip to the new hardlink target inode, retiring all chains
	 * related to oip before returning.  XXX vp->ip races.
	 */
	error = hammer2_inode_duplicate(fdip, oip, &nip, NULL, 0);
	if (error == 0) {
		/*
		 * Bump nlinks on duplicated hidden inode.
		 */
		kprintf("hardlink consolidation success in parent dir %s\n",
			fdip->ip_data.filename);
		hammer2_inode_lock_nlinks(nip);
		hammer2_inode_unlock_nlinks(oip);
		hammer2_chain_modify(hmp, &nip->chain, 0);
		++nip->ip_data.nlinks;
		hammer2_inode_unlock_ex(nip);

		if (oip->ip_data.name_key & HAMMER2_DIRHASH_VISIBLE) {
			/*
			 * Replace the old inode with an OBJTYPE_HARDLINK
			 * pointer.
			 */
			hammer2_inode_lock_ex(oip);
			hammer2_chain_modify(hmp, &oip->chain, 0);
			oip->ip_data.target_type = oip->ip_data.type;
			oip->ip_data.type = HAMMER2_OBJTYPE_HARDLINK;
			oip->ip_data.uflags = 0;
			oip->ip_data.rmajor = 0;
			oip->ip_data.rminor = 0;
			oip->ip_data.ctime = 0;
			oip->ip_data.mtime = 0;
			oip->ip_data.atime = 0;
			oip->ip_data.btime = 0;
			bzero(&oip->ip_data.uid, sizeof(oip->ip_data.uid));
			bzero(&oip->ip_data.gid, sizeof(oip->ip_data.gid));
			oip->ip_data.op_flags = HAMMER2_OPFLAG_DIRECTDATA;
			oip->ip_data.cap_flags = 0;
			oip->ip_data.mode = 0;
			oip->ip_data.size = 0;
			oip->ip_data.nlinks = 1;
			oip->ip_data.iparent = 0;	/* XXX */
			oip->ip_data.pfs_type = 0;
			oip->ip_data.pfs_inum = 0;
			bzero(&oip->ip_data.pfs_clid,
			      sizeof(oip->ip_data.pfs_clid));
			bzero(&oip->ip_data.pfs_fsid,
			      sizeof(oip->ip_data.pfs_fsid));
			oip->ip_data.data_quota = 0;
			oip->ip_data.data_count = 0;
			oip->ip_data.inode_quota = 0;
			oip->ip_data.inode_count = 0;
			oip->ip_data.attr_tid = 0;
			oip->ip_data.dirent_tid = 0;
			bzero(&oip->ip_data.u, sizeof(oip->ip_data.u));
			/* XXX transaction ids */

			hammer2_inode_unlock_ex(oip);
		} else {
			/*
			 * The old inode was a hardlink target, which we
			 * have now moved.  We must delete it so the new
			 * hardlink target at a higher directory level
			 * becomes the only hardlink target for this inode.
			 */
			kprintf("DELETE INVISIBLE\n");
			parent = oip->chain.parent;
			hammer2_chain_lock(hmp, parent,
					   HAMMER2_RESOLVE_ALWAYS);
			hammer2_chain_lock(hmp, &oip->chain,
					   HAMMER2_RESOLVE_ALWAYS);
			hammer2_chain_delete(hmp, parent, &oip->chain, 0);
			hammer2_chain_unlock(hmp, &oip->chain);
			hammer2_chain_unlock(hmp, parent);
		}
		*ipp = nip;
	} else {
		KKASSERT(nip == NULL);
	}

	return (error);
}
Ejemplo n.º 10
0
/*
 * Duplicate the specified existing inode in the specified target directory.
 * If name is NULL the inode is duplicated as a hidden directory entry.
 *
 * Returns the new inode.  The old inode is left alone.
 *
 * XXX name needs to be NULL for now.
 */
int
hammer2_inode_duplicate(hammer2_inode_t *dip, hammer2_inode_t *oip,
			hammer2_inode_t **nipp,
			const uint8_t *name, size_t name_len)
{
	hammer2_mount_t *hmp = dip->hmp;
	hammer2_inode_t *nip;
	hammer2_chain_t *parent;
	hammer2_chain_t *chain;
	hammer2_key_t lhc;
	int error;

	if (name) {
		lhc = hammer2_dirhash(name, name_len);
	} else {
		lhc = oip->ip_data.inum;
		KKASSERT((lhc & HAMMER2_DIRHASH_VISIBLE) == 0);
	}

	/*
	 * Locate the inode or indirect block to create the new
	 * entry in.  At the same time check for key collisions
	 * and iterate until we don't get one.
	 */
	nip = NULL;
	parent = &dip->chain;
	hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);

	error = 0;
	while (error == 0) {
		chain = hammer2_chain_lookup(hmp, &parent, lhc, lhc, 0);
		if (chain == NULL)
			break;
		/* XXX bcmp name if not NULL */
		if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK)
			error = ENOSPC;
		if ((lhc & HAMMER2_DIRHASH_VISIBLE) == 0) /* shouldn't happen */
			error = ENOSPC;
		hammer2_chain_unlock(hmp, chain);
		chain = NULL;
		++lhc;
	}

	/*
	 * Create entry in common parent directory.
	 */
	if (error == 0) {
		chain = hammer2_chain_create(hmp, parent, NULL, lhc, 0,
					     HAMMER2_BREF_TYPE_INODE /* n/a */,
					     HAMMER2_INODE_BYTES);   /* n/a */
		if (chain == NULL)
			error = EIO;
	}
	hammer2_chain_unlock(hmp, parent);

	/*
	 * Handle the error case
	 */
	if (error) {
		KKASSERT(chain == NULL);
		return (error);
	}

	/*
	 * XXX This is currently a horrible hack.  Well, if we wanted to
	 *     duplicate a file, i.e. as in a snapshot, we definitely
	 *     would have to flush it first.
	 *
	 *     For hardlink target generation we can theoretically move any
	 *     active chain structures without flushing, but that gets really
	 *     iffy for code which follows chain->parent and ip->pip links.
	 *
	 * XXX only works with files.  Duplicating a directory hierarchy
	 *     requires a flush but doesn't deal with races post-flush.
	 *     Well, it would work I guess, but you might catch some files
	 *     mid-operation.
	 *
	 * We cannot leave oip with any in-memory chains because (for a
	 * hardlink), oip will become a OBJTYPE_HARDLINK which is just a
	 * pointer to the real hardlink's inum and can't have any sub-chains.
	 * XXX might be 0-ref chains left.
	 */
	hammer2_inode_lock_ex(oip);
	hammer2_chain_flush(hmp, &oip->chain, 0);
	hammer2_inode_unlock_ex(oip);
	/*KKASSERT(RB_EMPTY(&oip->chain.rbhead));*/

	nip = chain->u.ip;
	hammer2_chain_modify(hmp, chain, 0);
	nip->ip_data = oip->ip_data;	/* sync media data after flush */

	if (name) {
		/*
		 * Directory entries are inodes so if the name has changed
		 * we have to update the inode.
		 */
		KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
		bcopy(name, nip->ip_data.filename, name_len);
		nip->ip_data.name_key = lhc;
		nip->ip_data.name_len = name_len;
	} else {
		/*
		 * Directory entries are inodes but this is a hidden hardlink
		 * target.  The name isn't used but to ease debugging give it
		 * a name after its inode number.
		 */
		ksnprintf(nip->ip_data.filename, sizeof(nip->ip_data.filename),
			  "0x%016jx", (intmax_t)nip->ip_data.inum);
		nip->ip_data.name_len = strlen(nip->ip_data.filename);
		nip->ip_data.name_key = lhc;
	}
	*nipp = nip;

	return (0);
}