/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Portions Copyright 2007 Jeremy Teo */ #pragma ident "%Z%%M% %I% %E% SMI" #ifdef _KERNEL #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fs/fs_subr.h" #include #include #include #include #include #endif /* _KERNEL */ #include #include #include #include #include /* * Functions needed for userland (ie: libzpool) are not put under * #ifdef_KERNEL; the rest of the functions have dependencies * (such as VFS logic) that will not compile easily in userland. */ #ifdef _KERNEL struct kmem_cache *znode_cache = NULL; /*ARGSUSED*/ static void znode_pageout_func(dmu_buf_t *dbuf, void *user_ptr) { znode_t *zp = user_ptr; vnode_t *vp = ZTOV(zp); mutex_enter(&zp->z_lock); if (vp->v_count == 0) { mutex_exit(&zp->z_lock); vn_invalid(vp); zfs_znode_free(zp); } else { /* signal force unmount that this znode can be freed */ zp->z_dbuf = NULL; mutex_exit(&zp->z_lock); } } /*ARGSUSED*/ static int zfs_znode_cache_constructor(void *buf, void *cdrarg, int kmflags) { znode_t *zp = buf; zp->z_vnode = vn_alloc(KM_SLEEP); zp->z_vnode->v_data = (caddr_t)zp; mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL); rw_init(&zp->z_map_lock, NULL, RW_DEFAULT, NULL); rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL); rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL); mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL); avl_create(&zp->z_range_avl, zfs_range_compare, sizeof (rl_t), offsetof(rl_t, r_node)); zp->z_dbuf_held = 0; zp->z_dirlocks = 0; return (0); } /*ARGSUSED*/ static void zfs_znode_cache_destructor(void *buf, void *cdarg) { znode_t *zp = buf; ASSERT(zp->z_dirlocks == 0); mutex_destroy(&zp->z_lock); rw_destroy(&zp->z_map_lock); rw_destroy(&zp->z_parent_lock); rw_destroy(&zp->z_name_lock); mutex_destroy(&zp->z_acl_lock); avl_destroy(&zp->z_range_avl); ASSERT(zp->z_dbuf_held == 0); ASSERT(ZTOV(zp)->v_count == 0); vn_free(ZTOV(zp)); } void zfs_znode_init(void) { /* * Initialize zcache */ ASSERT(znode_cache == NULL); znode_cache = kmem_cache_create("zfs_znode_cache", sizeof (znode_t), 0, zfs_znode_cache_constructor, zfs_znode_cache_destructor, NULL, NULL, NULL, 0); } void zfs_znode_fini(void) { /* * Cleanup vfs & vnode ops */ zfs_remove_op_tables(); /* * Cleanup zcache */ if (znode_cache) kmem_cache_destroy(znode_cache); znode_cache = NULL; } struct vnodeops *zfs_dvnodeops; struct vnodeops *zfs_fvnodeops; struct vnodeops *zfs_symvnodeops; struct vnodeops *zfs_xdvnodeops; struct vnodeops *zfs_evnodeops; void zfs_remove_op_tables() { /* * Remove vfs ops */ ASSERT(zfsfstype); (void) vfs_freevfsops_by_type(zfsfstype); zfsfstype = 0; /* * Remove vnode ops */ if (zfs_dvnodeops) vn_freevnodeops(zfs_dvnodeops); if (zfs_fvnodeops) vn_freevnodeops(zfs_fvnodeops); if (zfs_symvnodeops) vn_freevnodeops(zfs_symvnodeops); if (zfs_xdvnodeops) vn_freevnodeops(zfs_xdvnodeops); if (zfs_evnodeops) vn_freevnodeops(zfs_evnodeops); zfs_dvnodeops = NULL; zfs_fvnodeops = NULL; zfs_symvnodeops = NULL; zfs_xdvnodeops = NULL; zfs_evnodeops = NULL; } extern const fs_operation_def_t zfs_dvnodeops_template[]; extern const fs_operation_def_t zfs_fvnodeops_template[]; extern const fs_operation_def_t zfs_xdvnodeops_template[]; extern const fs_operation_def_t zfs_symvnodeops_template[]; extern const fs_operation_def_t zfs_evnodeops_template[]; int zfs_create_op_tables() { int error; /* * zfs_dvnodeops can be set if mod_remove() calls mod_installfs() * due to a failure to remove the the 2nd modlinkage (zfs_modldrv). * In this case we just return as the ops vectors are already set up. */ if (zfs_dvnodeops) return (0); error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template, &zfs_dvnodeops); if (error) return (error); error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template, &zfs_fvnodeops); if (error) return (error); error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template, &zfs_symvnodeops); if (error) return (error); error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template, &zfs_xdvnodeops); if (error) return (error); error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template, &zfs_evnodeops); return (error); } /* * zfs_init_fs - Initialize the zfsvfs struct and the file system * incore "master" object. Verify version compatibility. */ int zfs_init_fs(zfsvfs_t *zfsvfs, znode_t **zpp, cred_t *cr) { extern int zfsfstype; objset_t *os = zfsvfs->z_os; int i, error; dmu_object_info_t doi; uint64_t fsid_guid; *zpp = NULL; /* * XXX - hack to auto-create the pool root filesystem at * the first attempted mount. */ if (dmu_object_info(os, MASTER_NODE_OBJ, &doi) == ENOENT) { dmu_tx_t *tx = dmu_tx_create(os); dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* master */ dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* del queue */ dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); /* root node */ error = dmu_tx_assign(tx, TXG_WAIT); ASSERT3U(error, ==, 0); zfs_create_fs(os, cr, ZPL_VERSION, tx); dmu_tx_commit(tx); } error = zap_lookup(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 8, 1, &zfsvfs->z_version); if (error) { return (error); } else if (zfsvfs->z_version > ZPL_VERSION) { (void) printf("Mismatched versions: File system " "is version %lld on-disk format, which is " "incompatible with this software version %lld!", (u_longlong_t)zfsvfs->z_version, ZPL_VERSION); return (ENOTSUP); } /* * The fsid is 64 bits, composed of an 8-bit fs type, which * separates our fsid from any other filesystem types, and a * 56-bit objset unique ID. The objset unique ID is unique to * all objsets open on this system, provided by unique_create(). * The 8-bit fs type must be put in the low bits of fsid[1] * because that's where other Solaris filesystems put it. */ fsid_guid = dmu_objset_fsid_guid(os); ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); zfsvfs->z_vfs->vfs_fsid.val[0] = fsid_guid; zfsvfs->z_vfs->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | zfsfstype & 0xFF; error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, &zfsvfs->z_root); if (error) return (error); ASSERT(zfsvfs->z_root != 0); /* * Initialize zget mutex's */ for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); error = zfs_zget(zfsvfs, zfsvfs->z_root, zpp); if (error) return (error); ASSERT3U((*zpp)->z_id, ==, zfsvfs->z_root); error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, &zfsvfs->z_unlinkedobj); if (error) return (error); return (0); } /* * define a couple of values we need available * for both 64 and 32 bit environments. */ #ifndef NBITSMINOR64 #define NBITSMINOR64 32 #endif #ifndef MAXMAJ64 #define MAXMAJ64 0xffffffffUL #endif #ifndef MAXMIN64 #define MAXMIN64 0xffffffffUL #endif /* * Create special expldev for ZFS private use. * Can't use standard expldev since it doesn't do * what we want. The standard expldev() takes a * dev32_t in LP64 and expands it to a long dev_t. * We need an interface that takes a dev32_t in ILP32 * and expands it to a long dev_t. */ static uint64_t zfs_expldev(dev_t dev) { #ifndef _LP64 major_t major = (major_t)dev >> NBITSMINOR32 & MAXMAJ32; return (((uint64_t)major << NBITSMINOR64) | ((minor_t)dev & MAXMIN32)); #else return (dev); #endif } /* * Special cmpldev for ZFS private use. * Can't use standard cmpldev since it takes * a long dev_t and compresses it to dev32_t in * LP64. We need to do a compaction of a long dev_t * to a dev32_t in ILP32. */ dev_t zfs_cmpldev(uint64_t dev) { #ifndef _LP64 minor_t minor = (minor_t)dev & MAXMIN64; major_t major = (major_t)(dev >> NBITSMINOR64) & MAXMAJ64; if (major > MAXMAJ32 || minor > MAXMIN32) return (NODEV32); return (((dev32_t)major << NBITSMINOR32) | minor); #else return (dev); #endif } /* * Construct a new znode/vnode and intialize. * * This does not do a call to dmu_set_user() that is * up to the caller to do, in case you don't want to * return the znode */ static znode_t * zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, uint64_t obj_num, int blksz) { znode_t *zp; vnode_t *vp; zp = kmem_cache_alloc(znode_cache, KM_SLEEP); ASSERT(zp->z_dirlocks == NULL); zp->z_phys = db->db_data; zp->z_zfsvfs = zfsvfs; zp->z_unlinked = 0; zp->z_atime_dirty = 0; zp->z_dbuf_held = 0; zp->z_mapcnt = 0; zp->z_last_itx = 0; zp->z_dbuf = db; zp->z_id = obj_num; zp->z_blksz = blksz; zp->z_seq = 0x7A4653; zp->z_sync_cnt = 0; mutex_enter(&zfsvfs->z_znodes_lock); list_insert_tail(&zfsvfs->z_all_znodes, zp); mutex_exit(&zfsvfs->z_znodes_lock); vp = ZTOV(zp); vn_reinit(vp); vp->v_vfsp = zfsvfs->z_parent->z_vfs; vp->v_type = IFTOVT((mode_t)zp->z_phys->zp_mode); switch (vp->v_type) { case VDIR: if (zp->z_phys->zp_flags & ZFS_XATTR) { vn_setops(vp, zfs_xdvnodeops); vp->v_flag |= V_XATTRDIR; } else vn_setops(vp, zfs_dvnodeops); zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ break; case VBLK: case VCHR: vp->v_rdev = zfs_cmpldev(zp->z_phys->zp_rdev); /*FALLTHROUGH*/ case VFIFO: case VSOCK: case VDOOR: vn_setops(vp, zfs_fvnodeops); break; case VREG: vp->v_flag |= VMODSORT; vn_setops(vp, zfs_fvnodeops); break; case VLNK: vn_setops(vp, zfs_symvnodeops); break; default: vn_setops(vp, zfs_evnodeops); break; } return (zp); } static void zfs_znode_dmu_init(znode_t *zp) { znode_t *nzp; zfsvfs_t *zfsvfs = zp->z_zfsvfs; dmu_buf_t *db = zp->z_dbuf; mutex_enter(&zp->z_lock); nzp = dmu_buf_set_user_ie(db, zp, &zp->z_phys, znode_pageout_func); /* * there should be no * concurrent zgets on this object. */ ASSERT3P(nzp, ==, NULL); /* * Slap on VROOT if we are the root znode */ if (zp->z_id == zfsvfs->z_root) { ZTOV(zp)->v_flag |= VROOT; } ASSERT(zp->z_dbuf_held == 0); zp->z_dbuf_held = 1; VFS_HOLD(zfsvfs->z_vfs); mutex_exit(&zp->z_lock); vn_exists(ZTOV(zp)); } /* * Create a new DMU object to hold a zfs znode. * * IN: dzp - parent directory for new znode * vap - file attributes for new znode * tx - dmu transaction id for zap operations * cr - credentials of caller * flag - flags: * IS_ROOT_NODE - new object will be root * IS_XATTR - new object is an attribute * IS_REPLAY - intent log replay * * OUT: oid - ID of created object * */ void zfs_mknode(znode_t *dzp, vattr_t *vap, uint64_t *oid, dmu_tx_t *tx, cred_t *cr, uint_t flag, znode_t **zpp, int bonuslen) { dmu_buf_t *dbp; znode_phys_t *pzp; znode_t *zp; zfsvfs_t *zfsvfs = dzp->z_zfsvfs; timestruc_t now; uint64_t gen; int err; ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */ *oid = vap->va_nodeid; flag |= IS_REPLAY; now = vap->va_ctime; /* see zfs_replay_create() */ gen = vap->va_nblocks; /* ditto */ } else { *oid = 0; gethrestime(&now); gen = dmu_tx_get_txg(tx); } /* * Create a new DMU object. */ /* * There's currently no mechanism for pre-reading the blocks that will * be to needed allocate a new object, so we accept the small chance * that there will be an i/o error and we will fail one of the * assertions below. */ if (vap->va_type == VDIR) { if (flag & IS_REPLAY) { err = zap_create_claim(zfsvfs->z_os, *oid, DMU_OT_DIRECTORY_CONTENTS, DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); ASSERT3U(err, ==, 0); } else { *oid = zap_create(zfsvfs->z_os, DMU_OT_DIRECTORY_CONTENTS, DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); } } else { if (flag & IS_REPLAY) { err = dmu_object_claim(zfsvfs->z_os, *oid, DMU_OT_PLAIN_FILE_CONTENTS, 0, DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); ASSERT3U(err, ==, 0); } else { *oid = dmu_object_alloc(zfsvfs->z_os, DMU_OT_PLAIN_FILE_CONTENTS, 0, DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); } } VERIFY(0 == dmu_bonus_hold(zfsvfs->z_os, *oid, NULL, &dbp)); dmu_buf_will_dirty(dbp, tx); /* * Initialize the znode physical data to zero. */ ASSERT(dbp->db_size >= sizeof (znode_phys_t)); bzero(dbp->db_data, dbp->db_size); pzp = dbp->db_data; /* * If this is the root, fix up the half-initialized parent pointer * to reference the just-allocated physical data area. */ if (flag & IS_ROOT_NODE) { dzp->z_phys = pzp; dzp->z_id = *oid; } /* * If parent is an xattr, so am I. */ if (dzp->z_phys->zp_flags & ZFS_XATTR) flag |= IS_XATTR; if (vap->va_type == VBLK || vap->va_type == VCHR) { pzp->zp_rdev = zfs_expldev(vap->va_rdev); } if (vap->va_type == VDIR) { pzp->zp_size = 2; /* contents ("." and "..") */ pzp->zp_links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1; } pzp->zp_parent = dzp->z_id; if (flag & IS_XATTR) pzp->zp_flags |= ZFS_XATTR; pzp->zp_gen = gen; ZFS_TIME_ENCODE(&now, pzp->zp_crtime); ZFS_TIME_ENCODE(&now, pzp->zp_ctime); if (vap->va_mask & AT_ATIME) { ZFS_TIME_ENCODE(&vap->va_atime, pzp->zp_atime); } else { ZFS_TIME_ENCODE(&now, pzp->zp_atime); } if (vap->va_mask & AT_MTIME) { ZFS_TIME_ENCODE(&vap->va_mtime, pzp->zp_mtime); } else { ZFS_TIME_ENCODE(&now, pzp->zp_mtime); } pzp->zp_mode = MAKEIMODE(vap->va_type, vap->va_mode); zp = zfs_znode_alloc(zfsvfs, dbp, *oid, 0); zfs_perm_init(zp, dzp, flag, vap, tx, cr); if (zpp) { kmutex_t *hash_mtx = ZFS_OBJ_MUTEX(zp); mutex_enter(hash_mtx); zfs_znode_dmu_init(zp); mutex_exit(hash_mtx); *zpp = zp; } else { ZTOV(zp)->v_count = 0; dmu_buf_rele(dbp, NULL); zfs_znode_free(zp); } } int zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) { dmu_object_info_t doi; dmu_buf_t *db; znode_t *zp; int err; *zpp = NULL; ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); err = dmu_bonus_hold(zfsvfs->z_os, obj_num, NULL, &db); if (err) { ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); return (err); } dmu_object_info_from_db(db, &doi); if (doi.doi_bonus_type != DMU_OT_ZNODE || doi.doi_bonus_size < sizeof (znode_phys_t)) { dmu_buf_rele(db, NULL); ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); return (EINVAL); } ASSERT(db->db_object == obj_num); ASSERT(db->db_offset == -1); ASSERT(db->db_data != NULL); zp = dmu_buf_get_user(db); if (zp != NULL) { mutex_enter(&zp->z_lock); ASSERT3U(zp->z_id, ==, obj_num); if (zp->z_unlinked) { dmu_buf_rele(db, NULL); mutex_exit(&zp->z_lock); ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); return (ENOENT); } else if (zp->z_dbuf_held) { dmu_buf_rele(db, NULL); } else { zp->z_dbuf_held = 1; VFS_HOLD(zfsvfs->z_vfs); } VN_HOLD(ZTOV(zp)); mutex_exit(&zp->z_lock); ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); *zpp = zp; return (0); } /* * Not found create new znode/vnode */ zp = zfs_znode_alloc(zfsvfs, db, obj_num, doi.doi_data_block_size); ASSERT3U(zp->z_id, ==, obj_num); zfs_znode_dmu_init(zp); ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); *zpp = zp; return (0); } void zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) { zfsvfs_t *zfsvfs = zp->z_zfsvfs; int error; ZFS_OBJ_HOLD_ENTER(zfsvfs, zp->z_id); if (zp->z_phys->zp_acl.z_acl_extern_obj) { error = dmu_object_free(zfsvfs->z_os, zp->z_phys->zp_acl.z_acl_extern_obj, tx); ASSERT3U(error, ==, 0); } error = dmu_object_free(zfsvfs->z_os, zp->z_id, tx); ASSERT3U(error, ==, 0); zp->z_dbuf_held = 0; ZFS_OBJ_HOLD_EXIT(zfsvfs, zp->z_id); dmu_buf_rele(zp->z_dbuf, NULL); } void zfs_zinactive(znode_t *zp) { vnode_t *vp = ZTOV(zp); zfsvfs_t *zfsvfs = zp->z_zfsvfs; uint64_t z_id = zp->z_id; ASSERT(zp->z_dbuf_held && zp->z_phys); /* * Don't allow a zfs_zget() while were trying to release this znode */ ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); mutex_enter(&zp->z_lock); mutex_enter(&vp->v_lock); vp->v_count--; if (vp->v_count > 0 || vn_has_cached_data(vp)) { /* * If the hold count is greater than zero, somebody has * obtained a new reference on this znode while we were * processing it here, so we are done. If we still have * mapped pages then we are also done, since we don't * want to inactivate the znode until the pages get pushed. * * XXX - if vn_has_cached_data(vp) is true, but count == 0, * this seems like it would leave the znode hanging with * no chance to go inactive... */ mutex_exit(&vp->v_lock); mutex_exit(&zp->z_lock); ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); return; } mutex_exit(&vp->v_lock); /* * If this was the last reference to a file with no links, * remove the file from the file system. */ if (zp->z_unlinked) { mutex_exit(&zp->z_lock); ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); zfs_rmnode(zp); VFS_RELE(zfsvfs->z_vfs); return; } ASSERT(zp->z_phys); ASSERT(zp->z_dbuf_held); zp->z_dbuf_held = 0; mutex_exit(&zp->z_lock); dmu_buf_rele(zp->z_dbuf, NULL); ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); VFS_RELE(zfsvfs->z_vfs); } void zfs_znode_free(znode_t *zp) { zfsvfs_t *zfsvfs = zp->z_zfsvfs; mutex_enter(&zfsvfs->z_znodes_lock); list_remove(&zfsvfs->z_all_znodes, zp); mutex_exit(&zfsvfs->z_znodes_lock); kmem_cache_free(znode_cache, zp); } void zfs_time_stamper_locked(znode_t *zp, uint_t flag, dmu_tx_t *tx) { timestruc_t now; ASSERT(MUTEX_HELD(&zp->z_lock)); gethrestime(&now); if (tx) { dmu_buf_will_dirty(zp->z_dbuf, tx); zp->z_atime_dirty = 0; zp->z_seq++; } else { zp->z_atime_dirty = 1; } if (flag & AT_ATIME) ZFS_TIME_ENCODE(&now, zp->z_phys->zp_atime); if (flag & AT_MTIME) ZFS_TIME_ENCODE(&now, zp->z_phys->zp_mtime); if (flag & AT_CTIME) ZFS_TIME_ENCODE(&now, zp->z_phys->zp_ctime); } /* * Update the requested znode timestamps with the current time. * If we are in a transaction, then go ahead and mark the znode * dirty in the transaction so the timestamps will go to disk. * Otherwise, we will get pushed next time the znode is updated * in a transaction, or when this znode eventually goes inactive. * * Why is this OK? * 1 - Only the ACCESS time is ever updated outside of a transaction. * 2 - Multiple consecutive updates will be collapsed into a single * znode update by the transaction grouping semantics of the DMU. */ void zfs_time_stamper(znode_t *zp, uint_t flag, dmu_tx_t *tx) { mutex_enter(&zp->z_lock); zfs_time_stamper_locked(zp, flag, tx); mutex_exit(&zp->z_lock); } /* * Grow the block size for a file. * * IN: zp - znode of file to free data in. * size - requested block size * tx - open transaction. * * NOTE: this function assumes that the znode is write locked. */ void zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx) { int error; u_longlong_t dummy; if (size <= zp->z_blksz) return; /* * If the file size is already greater than the current blocksize, * we will not grow. If there is more than one block in a file, * the blocksize cannot change. */ if (zp->z_blksz && zp->z_phys->zp_size > zp->z_blksz) return; error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id, size, 0, tx); if (error == ENOTSUP) return; ASSERT3U(error, ==, 0); /* What blocksize did we actually get? */ dmu_object_size_from_db(zp->z_dbuf, &zp->z_blksz, &dummy); } /* * This is a dummy interface used when pvn_vplist_dirty() should *not* * be calling back into the fs for a putpage(). E.g.: when truncating * a file, the pages being "thrown away* don't need to be written out. */ /* ARGSUSED */ static int zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, int flags, cred_t *cr) { ASSERT(0); return (0); } /* * Free space in a file. * * IN: zp - znode of file to free data in. * off - start of section to free. * len - length of section to free (0 => to EOF). * flag - current file open mode flags. * * RETURN: 0 if success * error code if failure */ int zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) { vnode_t *vp = ZTOV(zp); dmu_tx_t *tx; zfsvfs_t *zfsvfs = zp->z_zfsvfs; zilog_t *zilog = zfsvfs->z_log; rl_t *rl; uint64_t end = off + len; uint64_t size, new_blksz; int error; if (ZTOV(zp)->v_type == VFIFO) return (0); /* * If we will change zp_size then lock the whole file, * otherwise just lock the range being freed. */ if (len == 0 || off + len > zp->z_phys->zp_size) { rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); } else { rl = zfs_range_lock(zp, off, len, RL_WRITER); /* recheck, in case zp_size changed */ if (off + len > zp->z_phys->zp_size) { /* lost race: file size changed, lock whole file */ zfs_range_unlock(rl); rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); } } /* * Nothing to do if file already at desired length. */ size = zp->z_phys->zp_size; if (len == 0 && size == off && off != 0) { zfs_range_unlock(rl); return (0); } /* * Check for any locks in the region to be freed. */ if (MANDLOCK(vp, (mode_t)zp->z_phys->zp_mode)) { uint64_t start = off; uint64_t extent = len; if (off > size) { start = size; extent += off - size; } else if (len == 0) { extent = size - off; } if (error = chklock(vp, FWRITE, start, extent, flag, NULL)) { zfs_range_unlock(rl); return (error); } } tx = dmu_tx_create(zfsvfs->z_os); dmu_tx_hold_bonus(tx, zp->z_id); new_blksz = 0; if (end > size && (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) { /* * We are growing the file past the current block size. */ if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) { ASSERT(!ISP2(zp->z_blksz)); new_blksz = MIN(end, SPA_MAXBLOCKSIZE); } else { new_blksz = MIN(end, zp->z_zfsvfs->z_max_blksz); } dmu_tx_hold_write(tx, zp->z_id, 0, MIN(end, new_blksz)); } else if (off < size) { /* * If len == 0, we are truncating the file. */ dmu_tx_hold_free(tx, zp->z_id, off, len ? len : DMU_OBJECT_END); } error = dmu_tx_assign(tx, zfsvfs->z_assign); if (error) { if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) dmu_tx_wait(tx); dmu_tx_abort(tx); zfs_range_unlock(rl); return (error); } if (new_blksz) zfs_grow_blocksize(zp, new_blksz, tx); if (end > size || len == 0) zp->z_phys->zp_size = end; if (off < size) { objset_t *os = zfsvfs->z_os; uint64_t rlen = len; if (len == 0) rlen = -1; else if (end > size) rlen = size - off; VERIFY(0 == dmu_free_range(os, zp->z_id, off, rlen, tx)); } if (log) { zfs_time_stamper(zp, CONTENT_MODIFIED, tx); zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); } zfs_range_unlock(rl); dmu_tx_commit(tx); /* * Clear any mapped pages in the truncated region. This has to * happen outside of the transaction to avoid the possibility of * a deadlock with someone trying to push a page that we are * about to invalidate. */ rw_enter(&zp->z_map_lock, RW_WRITER); if (off < size && vn_has_cached_data(vp)) { page_t *pp; uint64_t start = off & PAGEMASK; int poff = off & PAGEOFFSET; if (poff != 0 && (pp = page_lookup(vp, start, SE_SHARED))) { /* * We need to zero a partial page. */ pagezero(pp, poff, PAGESIZE - poff); start += PAGESIZE; page_unlock(pp); } error = pvn_vplist_dirty(vp, start, zfs_no_putpage, B_INVAL | B_TRUNC, NULL); ASSERT(error == 0); } rw_exit(&zp->z_map_lock); return (0); } void zfs_create_fs(objset_t *os, cred_t *cr, uint64_t version, dmu_tx_t *tx) { zfsvfs_t zfsvfs; uint64_t moid, doid, roid = 0; int error; znode_t *rootzp = NULL; vnode_t *vp; vattr_t vattr; /* * First attempt to create master node. */ /* * In an empty objset, there are no blocks to read and thus * there can be no i/o errors (which we assert below). */ moid = MASTER_NODE_OBJ; error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE, DMU_OT_NONE, 0, tx); ASSERT(error == 0); /* * Set starting attributes. */ error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx); ASSERT(error == 0); /* * Create a delete queue. */ doid = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &doid, tx); ASSERT(error == 0); /* * Create root znode. Create minimal znode/vnode/zfsvfs * to allow zfs_mknode to work. */ vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; vattr.va_type = VDIR; vattr.va_mode = S_IFDIR|0755; vattr.va_uid = crgetuid(cr); vattr.va_gid = crgetgid(cr); rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP); rootzp->z_zfsvfs = &zfsvfs; rootzp->z_unlinked = 0; rootzp->z_atime_dirty = 0; rootzp->z_dbuf_held = 0; vp = ZTOV(rootzp); vn_reinit(vp); vp->v_type = VDIR; bzero(&zfsvfs, sizeof (zfsvfs_t)); zfsvfs.z_os = os; zfsvfs.z_assign = TXG_NOWAIT; zfsvfs.z_parent = &zfsvfs; mutex_init(&zfsvfs.z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); list_create(&zfsvfs.z_all_znodes, sizeof (znode_t), offsetof(znode_t, z_link_node)); zfs_mknode(rootzp, &vattr, &roid, tx, cr, IS_ROOT_NODE, NULL, 0); ASSERT3U(rootzp->z_id, ==, roid); error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &roid, tx); ASSERT(error == 0); ZTOV(rootzp)->v_count = 0; kmem_cache_free(znode_cache, rootzp); } #endif /* _KERNEL */ /* * Given an object number, return its parent object number and whether * or not the object is an extended attribute directory. */ static int zfs_obj_to_pobj(objset_t *osp, uint64_t obj, uint64_t *pobjp, int *is_xattrdir) { dmu_buf_t *db; dmu_object_info_t doi; znode_phys_t *zp; int error; if ((error = dmu_bonus_hold(osp, obj, FTAG, &db)) != 0) return (error); dmu_object_info_from_db(db, &doi); if (doi.doi_bonus_type != DMU_OT_ZNODE || doi.doi_bonus_size < sizeof (znode_phys_t)) { dmu_buf_rele(db, FTAG); return (EINVAL); } zp = db->db_data; *pobjp = zp->zp_parent; *is_xattrdir = ((zp->zp_flags & ZFS_XATTR) != 0) && S_ISDIR(zp->zp_mode); dmu_buf_rele(db, FTAG); return (0); } int zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) { char *path = buf + len - 1; int error; *path = '\0'; for (;;) { uint64_t pobj; char component[MAXNAMELEN + 2]; size_t complen; int is_xattrdir; if ((error = zfs_obj_to_pobj(osp, obj, &pobj, &is_xattrdir)) != 0) break; if (pobj == obj) { if (path[0] != '/') *--path = '/'; break; } component[0] = '/'; if (is_xattrdir) { (void) sprintf(component + 1, ""); } else { error = zap_value_search(osp, pobj, obj, ZFS_DIRENT_OBJ(-1ULL), component + 1); if (error != 0) break; } complen = strlen(component); path -= complen; ASSERT(path >= buf); bcopy(component, path, complen); obj = pobj; } if (error == 0) (void) memmove(buf, path, buf + len - path); return (error); }