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Diffstat (limited to 'module/zfs/zfs_znode.c')
| -rw-r--r-- | module/zfs/zfs_znode.c | 1672 |
1 files changed, 1672 insertions, 0 deletions
diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c new file mode 100644 index 000000000..25751ae5f --- /dev/null +++ b/module/zfs/zfs_znode.c @@ -0,0 +1,1672 @@ +/* + * 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 2008 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* Portions Copyright 2007 Jeremy Teo */ + +#ifdef _KERNEL +#include <sys/types.h> +#include <sys/param.h> +#include <sys/time.h> +#include <sys/systm.h> +#include <sys/sysmacros.h> +#include <sys/resource.h> +#include <sys/mntent.h> +#include <sys/mkdev.h> +#include <sys/u8_textprep.h> +#include <sys/dsl_dataset.h> +#include <sys/vfs.h> +#include <sys/vfs_opreg.h> +#include <sys/vnode.h> +#include <sys/file.h> +#include <sys/kmem.h> +#include <sys/errno.h> +#include <sys/unistd.h> +#include <sys/mode.h> +#include <sys/atomic.h> +#include <vm/pvn.h> +#include "fs/fs_subr.h" +#include <sys/zfs_dir.h> +#include <sys/zfs_acl.h> +#include <sys/zfs_ioctl.h> +#include <sys/zfs_rlock.h> +#include <sys/zfs_fuid.h> +#include <sys/fs/zfs.h> +#include <sys/kidmap.h> +#endif /* _KERNEL */ + +#include <sys/dmu.h> +#include <sys/refcount.h> +#include <sys/stat.h> +#include <sys/zap.h> +#include <sys/zfs_znode.h> + +#include "zfs_prop.h" + +/* + * Define ZNODE_STATS to turn on statistic gathering. By default, it is only + * turned on when DEBUG is also defined. + */ +#ifdef DEBUG +#define ZNODE_STATS +#endif /* DEBUG */ + +#ifdef ZNODE_STATS +#define ZNODE_STAT_ADD(stat) ((stat)++) +#else +#define ZNODE_STAT_ADD(stat) /* nothing */ +#endif /* ZNODE_STATS */ + +#define POINTER_IS_VALID(p) (!((uintptr_t)(p) & 0x3)) +#define POINTER_INVALIDATE(pp) (*(pp) = (void *)((uintptr_t)(*(pp)) | 0x1)) + +/* + * 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 +static kmem_cache_t *znode_cache = NULL; + +/*ARGSUSED*/ +static void +znode_evict_error(dmu_buf_t *dbuf, void *user_ptr) +{ + /* + * We should never drop all dbuf refs without first clearing + * the eviction callback. + */ + panic("evicting znode %p\n", user_ptr); +} + +/*ARGSUSED*/ +static int +zfs_znode_cache_constructor(void *buf, void *arg, int kmflags) +{ + znode_t *zp = buf; + + ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); + + zp->z_vnode = vn_alloc(kmflags); + if (zp->z_vnode == NULL) { + return (-1); + } + ZTOV(zp)->v_data = zp; + + list_link_init(&zp->z_link_node); + + 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 = NULL; + zp->z_dirlocks = NULL; + return (0); +} + +/*ARGSUSED*/ +static void +zfs_znode_cache_destructor(void *buf, void *arg) +{ + znode_t *zp = buf; + + ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); + ASSERT(ZTOV(zp)->v_data == zp); + vn_free(ZTOV(zp)); + ASSERT(!list_link_active(&zp->z_link_node)); + 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); + mutex_destroy(&zp->z_range_lock); + + ASSERT(zp->z_dbuf == NULL); + ASSERT(zp->z_dirlocks == NULL); +} + +#ifdef ZNODE_STATS +static struct { + uint64_t zms_zfsvfs_invalid; + uint64_t zms_zfsvfs_unmounted; + uint64_t zms_zfsvfs_recheck_invalid; + uint64_t zms_obj_held; + uint64_t zms_vnode_locked; + uint64_t zms_not_only_dnlc; +} znode_move_stats; +#endif /* ZNODE_STATS */ + +static void +zfs_znode_move_impl(znode_t *ozp, znode_t *nzp) +{ + vnode_t *vp; + + /* Copy fields. */ + nzp->z_zfsvfs = ozp->z_zfsvfs; + + /* Swap vnodes. */ + vp = nzp->z_vnode; + nzp->z_vnode = ozp->z_vnode; + ozp->z_vnode = vp; /* let destructor free the overwritten vnode */ + ZTOV(ozp)->v_data = ozp; + ZTOV(nzp)->v_data = nzp; + + nzp->z_id = ozp->z_id; + ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */ + ASSERT(avl_numnodes(&ozp->z_range_avl) == 0); + nzp->z_unlinked = ozp->z_unlinked; + nzp->z_atime_dirty = ozp->z_atime_dirty; + nzp->z_zn_prefetch = ozp->z_zn_prefetch; + nzp->z_blksz = ozp->z_blksz; + nzp->z_seq = ozp->z_seq; + nzp->z_mapcnt = ozp->z_mapcnt; + nzp->z_last_itx = ozp->z_last_itx; + nzp->z_gen = ozp->z_gen; + nzp->z_sync_cnt = ozp->z_sync_cnt; + nzp->z_phys = ozp->z_phys; + nzp->z_dbuf = ozp->z_dbuf; + + /* Update back pointers. */ + (void) dmu_buf_update_user(nzp->z_dbuf, ozp, nzp, &nzp->z_phys, + znode_evict_error); + + /* + * Invalidate the original znode by clearing fields that provide a + * pointer back to the znode. Set the low bit of the vfs pointer to + * ensure that zfs_znode_move() recognizes the znode as invalid in any + * subsequent callback. + */ + ozp->z_dbuf = NULL; + POINTER_INVALIDATE(&ozp->z_zfsvfs); +} + +/* + * Wrapper function for ZFS_ENTER that returns 0 if successful and otherwise + * returns a non-zero error code. + */ +static int +zfs_enter(zfsvfs_t *zfsvfs) +{ + ZFS_ENTER(zfsvfs); + return (0); +} + +/*ARGSUSED*/ +static kmem_cbrc_t +zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg) +{ + znode_t *ozp = buf, *nzp = newbuf; + zfsvfs_t *zfsvfs; + vnode_t *vp; + + /* + * The znode is on the file system's list of known znodes if the vfs + * pointer is valid. We set the low bit of the vfs pointer when freeing + * the znode to invalidate it, and the memory patterns written by kmem + * (baddcafe and deadbeef) set at least one of the two low bits. A newly + * created znode sets the vfs pointer last of all to indicate that the + * znode is known and in a valid state to be moved by this function. + */ + zfsvfs = ozp->z_zfsvfs; + if (!POINTER_IS_VALID(zfsvfs)) { + ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid); + return (KMEM_CBRC_DONT_KNOW); + } + + /* + * Ensure that the filesystem is not unmounted during the move. + */ + if (zfs_enter(zfsvfs) != 0) { /* ZFS_ENTER */ + ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted); + return (KMEM_CBRC_DONT_KNOW); + } + + mutex_enter(&zfsvfs->z_znodes_lock); + /* + * Recheck the vfs pointer in case the znode was removed just before + * acquiring the lock. + */ + if (zfsvfs != ozp->z_zfsvfs) { + mutex_exit(&zfsvfs->z_znodes_lock); + ZFS_EXIT(zfsvfs); + ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck_invalid); + return (KMEM_CBRC_DONT_KNOW); + } + + /* + * At this point we know that as long as we hold z_znodes_lock, the + * znode cannot be freed and fields within the znode can be safely + * accessed. Now, prevent a race with zfs_zget(). + */ + if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) { + mutex_exit(&zfsvfs->z_znodes_lock); + ZFS_EXIT(zfsvfs); + ZNODE_STAT_ADD(znode_move_stats.zms_obj_held); + return (KMEM_CBRC_LATER); + } + + vp = ZTOV(ozp); + if (mutex_tryenter(&vp->v_lock) == 0) { + ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); + mutex_exit(&zfsvfs->z_znodes_lock); + ZFS_EXIT(zfsvfs); + ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked); + return (KMEM_CBRC_LATER); + } + + /* Only move znodes that are referenced _only_ by the DNLC. */ + if (vp->v_count != 1 || !vn_in_dnlc(vp)) { + mutex_exit(&vp->v_lock); + ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); + mutex_exit(&zfsvfs->z_znodes_lock); + ZFS_EXIT(zfsvfs); + ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc); + return (KMEM_CBRC_LATER); + } + + /* + * The znode is known and in a valid state to move. We're holding the + * locks needed to execute the critical section. + */ + zfs_znode_move_impl(ozp, nzp); + mutex_exit(&vp->v_lock); + ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); + + list_link_replace(&ozp->z_link_node, &nzp->z_link_node); + mutex_exit(&zfsvfs->z_znodes_lock); + ZFS_EXIT(zfsvfs); + + return (KMEM_CBRC_YES); +} + +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); + kmem_cache_set_move(znode_cache, zfs_znode_move); +} + +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) +{ + extern int zfsfstype; + + objset_t *os = zfsvfs->z_os; + int i, error; + uint64_t fsid_guid; + uint64_t zval; + + *zpp = NULL; + + error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); + if (error) { + return (error); + } else if (zfsvfs->z_version > ZPL_VERSION) { + (void) printf("Mismatched versions: File system " + "is version %llu on-disk format, which is " + "incompatible with this software version %lld!", + (u_longlong_t)zfsvfs->z_version, ZPL_VERSION); + return (ENOTSUP); + } + + if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) + return (error); + zfsvfs->z_norm = (int)zval; + if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) + return (error); + zfsvfs->z_utf8 = (zval != 0); + if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) + return (error); + zfsvfs->z_case = (uint_t)zval; + /* + * Fold case on file systems that are always or sometimes case + * insensitive. + */ + if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || + zfsvfs->z_case == ZFS_CASE_MIXED) + zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; + + /* + * 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); + + error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, + &zfsvfs->z_unlinkedobj); + if (error) + return (error); + + /* + * 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) { + /* + * On error, we destroy the mutexes here since it's not + * possible for the caller to determine if the mutexes were + * initialized properly. + */ + for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) + mutex_destroy(&zfsvfs->z_hold_mtx[i]); + return (error); + } + ASSERT3U((*zpp)->z_id, ==, zfsvfs->z_root); + error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, + &zfsvfs->z_fuid_obj); + if (error == ENOENT) + error = 0; + + 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 +} + +static void +zfs_znode_dmu_init(zfsvfs_t *zfsvfs, znode_t *zp, dmu_buf_t *db) +{ + znode_t *nzp; + + ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs)); + ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id))); + + mutex_enter(&zp->z_lock); + + ASSERT(zp->z_dbuf == NULL); + zp->z_dbuf = db; + nzp = dmu_buf_set_user_ie(db, zp, &zp->z_phys, znode_evict_error); + + /* + * there should be no + * concurrent zgets on this object. + */ + if (nzp != NULL) + panic("existing znode %p for dbuf %p", (void *)nzp, (void *)db); + + /* + * Slap on VROOT if we are the root znode + */ + if (zp->z_id == zfsvfs->z_root) + ZTOV(zp)->v_flag |= VROOT; + + mutex_exit(&zp->z_lock); + vn_exists(ZTOV(zp)); +} + +void +zfs_znode_dmu_fini(znode_t *zp) +{ + dmu_buf_t *db = zp->z_dbuf; + ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) || + zp->z_unlinked || + RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock)); + ASSERT(zp->z_dbuf != NULL); + zp->z_dbuf = NULL; + VERIFY(zp == dmu_buf_update_user(db, zp, NULL, NULL, NULL)); + dmu_buf_rele(db, NULL); +} + +/* + * 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, int blksz) +{ + znode_t *zp; + vnode_t *vp; + + zp = kmem_cache_alloc(znode_cache, KM_SLEEP); + + ASSERT(zp->z_dirlocks == NULL); + ASSERT(zp->z_dbuf == NULL); + ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); + + /* + * Defer setting z_zfsvfs until the znode is ready to be a candidate for + * the zfs_znode_move() callback. + */ + zp->z_phys = NULL; + zp->z_unlinked = 0; + zp->z_atime_dirty = 0; + zp->z_mapcnt = 0; + zp->z_last_itx = 0; + zp->z_id = db->db_object; + zp->z_blksz = blksz; + zp->z_seq = 0x7A4653; + zp->z_sync_cnt = 0; + + vp = ZTOV(zp); + vn_reinit(vp); + + zfs_znode_dmu_init(zfsvfs, zp, db); + + zp->z_gen = zp->z_phys->zp_gen; + + 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; + } + + mutex_enter(&zfsvfs->z_znodes_lock); + list_insert_tail(&zfsvfs->z_all_znodes, zp); + membar_producer(); + /* + * Everything else must be valid before assigning z_zfsvfs makes the + * znode eligible for zfs_znode_move(). + */ + zp->z_zfsvfs = zfsvfs; + mutex_exit(&zfsvfs->z_znodes_lock); + + VFS_HOLD(zfsvfs->z_vfs); + return (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 + * bonuslen - length of bonus buffer + * setaclp - File/Dir initial ACL + * fuidp - Tracks fuid allocation. + * + * OUT: zpp - allocated znode + * + */ +void +zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, + uint_t flag, znode_t **zpp, int bonuslen, zfs_acl_t *setaclp, + zfs_fuid_info_t **fuidp) +{ + dmu_buf_t *db; + znode_phys_t *pzp; + zfsvfs_t *zfsvfs = dzp->z_zfsvfs; + timestruc_t now; + uint64_t gen, obj; + int err; + + ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); + + if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */ + obj = vap->va_nodeid; + flag |= IS_REPLAY; + now = vap->va_ctime; /* see zfs_replay_create() */ + gen = vap->va_nblocks; /* ditto */ + } else { + obj = 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_norm(zfsvfs->z_os, obj, + zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, + DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); + ASSERT3U(err, ==, 0); + } else { + obj = zap_create_norm(zfsvfs->z_os, + zfsvfs->z_norm, 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, obj, + DMU_OT_PLAIN_FILE_CONTENTS, 0, + DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); + ASSERT3U(err, ==, 0); + } else { + obj = 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, obj, NULL, &db)); + dmu_buf_will_dirty(db, tx); + + /* + * Initialize the znode physical data to zero. + */ + ASSERT(db->db_size >= sizeof (znode_phys_t)); + bzero(db->db_data, db->db_size); + pzp = db->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_dbuf = db; + dzp->z_phys = pzp; + dzp->z_id = obj; + } + + /* + * 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 (zfsvfs->z_use_fuids) + pzp->zp_flags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; + + 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); + if (!(flag & IS_ROOT_NODE)) { + ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); + *zpp = zfs_znode_alloc(zfsvfs, db, 0); + ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); + } else { + /* + * If we are creating the root node, the "parent" we + * passed in is the znode for the root. + */ + *zpp = dzp; + } + zfs_perm_init(*zpp, dzp, flag, vap, tx, cr, setaclp, fuidp); +} + +void +zfs_xvattr_set(znode_t *zp, xvattr_t *xvap) +{ + xoptattr_t *xoap; + + xoap = xva_getxoptattr(xvap); + ASSERT(xoap); + + if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { + ZFS_TIME_ENCODE(&xoap->xoa_createtime, zp->z_phys->zp_crtime); + XVA_SET_RTN(xvap, XAT_CREATETIME); + } + if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { + ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly); + XVA_SET_RTN(xvap, XAT_READONLY); + } + if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { + ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden); + XVA_SET_RTN(xvap, XAT_HIDDEN); + } + if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { + ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system); + XVA_SET_RTN(xvap, XAT_SYSTEM); + } + if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { + ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive); + XVA_SET_RTN(xvap, XAT_ARCHIVE); + } + if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { + ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable); + XVA_SET_RTN(xvap, XAT_IMMUTABLE); + } + if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { + ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink); + XVA_SET_RTN(xvap, XAT_NOUNLINK); + } + if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { + ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly); + XVA_SET_RTN(xvap, XAT_APPENDONLY); + } + if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { + ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump); + XVA_SET_RTN(xvap, XAT_NODUMP); + } + if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { + ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque); + XVA_SET_RTN(xvap, XAT_OPAQUE); + } + if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { + ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED, + xoap->xoa_av_quarantined); + XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); + } + if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { + ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified); + XVA_SET_RTN(xvap, XAT_AV_MODIFIED); + } + if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { + (void) memcpy(zp->z_phys + 1, xoap->xoa_av_scanstamp, + sizeof (xoap->xoa_av_scanstamp)); + zp->z_phys->zp_flags |= ZFS_BONUS_SCANSTAMP; + XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); + } +} + +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); + } + + zp = dmu_buf_get_user(db); + if (zp != NULL) { + mutex_enter(&zp->z_lock); + + /* + * Since we do immediate eviction of the z_dbuf, we + * should never find a dbuf with a znode that doesn't + * know about the dbuf. + */ + ASSERT3P(zp->z_dbuf, ==, db); + ASSERT3U(zp->z_id, ==, obj_num); + if (zp->z_unlinked) { + err = ENOENT; + } else { + VN_HOLD(ZTOV(zp)); + *zpp = zp; + err = 0; + } + dmu_buf_rele(db, NULL); + mutex_exit(&zp->z_lock); + ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); + return (err); + } + + /* + * Not found create new znode/vnode + */ + zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size); + ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); + *zpp = zp; + return (0); +} + +int +zfs_rezget(znode_t *zp) +{ + zfsvfs_t *zfsvfs = zp->z_zfsvfs; + dmu_object_info_t doi; + dmu_buf_t *db; + uint64_t obj_num = zp->z_id; + int err; + + 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); + } + + if (((znode_phys_t *)db->db_data)->zp_gen != zp->z_gen) { + dmu_buf_rele(db, NULL); + ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); + return (EIO); + } + + zfs_znode_dmu_init(zfsvfs, zp, db); + zp->z_unlinked = (zp->z_phys->zp_links == 0); + zp->z_blksz = doi.doi_data_block_size; + + ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); + + return (0); +} + +void +zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) +{ + zfsvfs_t *zfsvfs = zp->z_zfsvfs; + objset_t *os = zfsvfs->z_os; + uint64_t obj = zp->z_id; + uint64_t acl_obj = zp->z_phys->zp_acl.z_acl_extern_obj; + + ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); + if (acl_obj) + VERIFY(0 == dmu_object_free(os, acl_obj, tx)); + VERIFY(0 == dmu_object_free(os, obj, tx)); + zfs_znode_dmu_fini(zp); + ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); + zfs_znode_free(zp); +} + +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 && 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); + return; + } + mutex_exit(&zp->z_lock); + zfs_znode_dmu_fini(zp); + ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); + zfs_znode_free(zp); +} + +void +zfs_znode_free(znode_t *zp) +{ + zfsvfs_t *zfsvfs = zp->z_zfsvfs; + + vn_invalid(ZTOV(zp)); + + ASSERT(ZTOV(zp)->v_count == 0); + + mutex_enter(&zfsvfs->z_znodes_lock); + POINTER_INVALIDATE(&zp->z_zfsvfs); + list_remove(&zfsvfs->z_all_znodes, zp); + mutex_exit(&zfsvfs->z_znodes_lock); + + kmem_cache_free(znode_cache, zp); + + VFS_RELE(zfsvfs->z_vfs); +} + +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 (zp->z_zfsvfs->z_use_fuids) + zp->z_phys->zp_flags |= (ZFS_ARCHIVE | ZFS_AV_MODIFIED); + } + + if (flag & AT_CTIME) { + ZFS_TIME_ENCODE(&now, zp->z_phys->zp_ctime); + if (zp->z_zfsvfs->z_use_fuids) + zp->z_phys->zp_flags |= ZFS_ARCHIVE; + } +} + +/* + * 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); +} + +/* + * Increase the file length + * + * IN: zp - znode of file to free data in. + * end - new end-of-file + * + * RETURN: 0 if success + * error code if failure + */ +static int +zfs_extend(znode_t *zp, uint64_t end) +{ + zfsvfs_t *zfsvfs = zp->z_zfsvfs; + dmu_tx_t *tx; + rl_t *rl; + uint64_t newblksz; + int error; + + /* + * We will change zp_size, lock the whole file. + */ + rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); + + /* + * Nothing to do if file already at desired length. + */ + if (end <= zp->z_phys->zp_size) { + zfs_range_unlock(rl); + return (0); + } +top: + tx = dmu_tx_create(zfsvfs->z_os); + dmu_tx_hold_bonus(tx, zp->z_id); + if (end > zp->z_blksz && + (!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)); + newblksz = MIN(end, SPA_MAXBLOCKSIZE); + } else { + newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz); + } + dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); + } else { + newblksz = 0; + } + + 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); + goto top; + } + dmu_tx_abort(tx); + zfs_range_unlock(rl); + return (error); + } + dmu_buf_will_dirty(zp->z_dbuf, tx); + + if (newblksz) + zfs_grow_blocksize(zp, newblksz, tx); + + zp->z_phys->zp_size = end; + + zfs_range_unlock(rl); + + dmu_tx_commit(tx); + + 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. + * + * RETURN: 0 if success + * error code if failure + */ +static int +zfs_free_range(znode_t *zp, uint64_t off, uint64_t len) +{ + zfsvfs_t *zfsvfs = zp->z_zfsvfs; + rl_t *rl; + int error; + + /* + * Lock the range being freed. + */ + rl = zfs_range_lock(zp, off, len, RL_WRITER); + + /* + * Nothing to do if file already at desired length. + */ + if (off >= zp->z_phys->zp_size) { + zfs_range_unlock(rl); + return (0); + } + + if (off + len > zp->z_phys->zp_size) + len = zp->z_phys->zp_size - off; + + error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len); + + zfs_range_unlock(rl); + + return (error); +} + +/* + * Truncate a file + * + * IN: zp - znode of file to free data in. + * end - new end-of-file. + * + * RETURN: 0 if success + * error code if failure + */ +static int +zfs_trunc(znode_t *zp, uint64_t end) +{ + zfsvfs_t *zfsvfs = zp->z_zfsvfs; + vnode_t *vp = ZTOV(zp); + dmu_tx_t *tx; + rl_t *rl; + int error; + + /* + * We will change zp_size, lock the whole file. + */ + rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); + + /* + * Nothing to do if file already at desired length. + */ + if (end >= zp->z_phys->zp_size) { + zfs_range_unlock(rl); + return (0); + } + + error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1); + if (error) { + zfs_range_unlock(rl); + return (error); + } +top: + tx = dmu_tx_create(zfsvfs->z_os); + dmu_tx_hold_bonus(tx, zp->z_id); + 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); + goto top; + } + dmu_tx_abort(tx); + zfs_range_unlock(rl); + return (error); + } + dmu_buf_will_dirty(zp->z_dbuf, tx); + + zp->z_phys->zp_size = end; + + dmu_tx_commit(tx); + + zfs_range_unlock(rl); + + /* + * 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 (vn_has_cached_data(vp)) { + page_t *pp; + uint64_t start = end & PAGEMASK; + int poff = end & 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); +} + +/* + * Free space in a file + * + * IN: zp - znode of file to free data in. + * off - start of range + * len - end of range (0 => EOF) + * flag - current file open mode flags. + * log - TRUE if this action should be logged + * + * 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; + int error; + + if (off > zp->z_phys->zp_size) { + error = zfs_extend(zp, off+len); + if (error == 0 && log) + goto log; + else + return (error); + } + + /* + * Check for any locks in the region to be freed. + */ + if (MANDLOCK(vp, (mode_t)zp->z_phys->zp_mode)) { + uint64_t length = (len ? len : zp->z_phys->zp_size - off); + if (error = chklock(vp, FWRITE, off, length, flag, NULL)) + return (error); + } + + if (len == 0) { + error = zfs_trunc(zp, off); + } else { + if ((error = zfs_free_range(zp, off, len)) == 0 && + off + len > zp->z_phys->zp_size) + error = zfs_extend(zp, off+len); + } + if (error || !log) + return (error); +log: + tx = dmu_tx_create(zfsvfs->z_os); + dmu_tx_hold_bonus(tx, zp->z_id); + 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); + goto log; + } + dmu_tx_abort(tx); + return (error); + } + + zfs_time_stamper(zp, CONTENT_MODIFIED, tx); + zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); + + dmu_tx_commit(tx); + return (0); +} + +void +zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) +{ + zfsvfs_t zfsvfs; + uint64_t moid, doid, version; + uint64_t sense = ZFS_CASE_SENSITIVE; + uint64_t norm = 0; + nvpair_t *elem; + int error; + znode_t *rootzp = NULL; + vnode_t *vp; + vattr_t vattr; + znode_t *zp; + + /* + * 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. + */ + if (spa_version(dmu_objset_spa(os)) >= SPA_VERSION_FUID) + version = ZPL_VERSION; + else + version = ZPL_VERSION_FUID - 1; + error = zap_update(os, moid, ZPL_VERSION_STR, + 8, 1, &version, tx); + elem = NULL; + while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) { + /* For the moment we expect all zpl props to be uint64_ts */ + uint64_t val; + char *name; + + ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64); + VERIFY(nvpair_value_uint64(elem, &val) == 0); + name = nvpair_name(elem); + if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) { + version = val; + error = zap_update(os, moid, ZPL_VERSION_STR, + 8, 1, &version, tx); + } else { + error = zap_update(os, moid, name, 8, 1, &val, tx); + } + ASSERT(error == 0); + if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0) + norm = val; + else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0) + sense = val; + } + ASSERT(version != 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_unlinked = 0; + rootzp->z_atime_dirty = 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; + zfsvfs.z_version = version; + zfsvfs.z_use_fuids = USE_FUIDS(version, os); + zfsvfs.z_norm = norm; + /* + * Fold case on file systems that are always or sometimes case + * insensitive. + */ + if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED) + zfsvfs.z_norm |= U8_TEXTPREP_TOUPPER; + + 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)); + + ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs)); + rootzp->z_zfsvfs = &zfsvfs; + zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, 0, NULL, NULL); + ASSERT3P(zp, ==, rootzp); + ASSERT(!vn_in_dnlc(ZTOV(rootzp))); /* not valid to move */ + error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); + ASSERT(error == 0); + POINTER_INVALIDATE(&rootzp->z_zfsvfs); + + ZTOV(rootzp)->v_count = 0; + dmu_buf_rele(rootzp->z_dbuf, NULL); + rootzp->z_dbuf = NULL; + 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, "<xattrdir>"); + } 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); +} |