| /* |
| * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2012, 2018 by Delphix. All rights reserved. |
| */ |
| |
| /* Portions Copyright 2007 Jeremy Teo */ |
| |
| #ifdef _KERNEL |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <sys/time.h> |
| #include <sys/sysmacros.h> |
| #include <sys/mntent.h> |
| #include <sys/u8_textprep.h> |
| #include <sys/dsl_dataset.h> |
| #include <sys/vfs.h> |
| #include <sys/vnode.h> |
| #include <sys/file.h> |
| #include <sys/kmem.h> |
| #include <sys/errno.h> |
| #include <sys/mode.h> |
| #include <sys/atomic.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/zfs_vnops.h> |
| #include <sys/zfs_ctldir.h> |
| #include <sys/dnode.h> |
| #include <sys/fs/zfs.h> |
| #include <sys/zpl.h> |
| #endif /* _KERNEL */ |
| |
| #include <sys/dmu.h> |
| #include <sys/dmu_objset.h> |
| #include <sys/dmu_tx.h> |
| #include <sys/refcount.h> |
| #include <sys/stat.h> |
| #include <sys/zap.h> |
| #include <sys/zfs_znode.h> |
| #include <sys/sa.h> |
| #include <sys/zfs_sa.h> |
| #include <sys/zfs_stat.h> |
| |
| #include "zfs_prop.h" |
| #include "zfs_comutil.h" |
| |
| /* |
| * 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; |
| static kmem_cache_t *znode_hold_cache = NULL; |
| unsigned int zfs_object_mutex_size = ZFS_OBJ_MTX_SZ; |
| |
| /* |
| * This is used by the test suite so that it can delay znodes from being |
| * freed in order to inspect the unlinked set. |
| */ |
| int zfs_unlink_suspend_progress = 0; |
| |
| /* |
| * This callback is invoked when acquiring a RL_WRITER or RL_APPEND lock on |
| * z_rangelock. It will modify the offset and length of the lock to reflect |
| * znode-specific information, and convert RL_APPEND to RL_WRITER. This is |
| * called with the rangelock_t's rl_lock held, which avoids races. |
| */ |
| static void |
| zfs_rangelock_cb(zfs_locked_range_t *new, void *arg) |
| { |
| znode_t *zp = arg; |
| |
| /* |
| * If in append mode, convert to writer and lock starting at the |
| * current end of file. |
| */ |
| if (new->lr_type == RL_APPEND) { |
| new->lr_offset = zp->z_size; |
| new->lr_type = RL_WRITER; |
| } |
| |
| /* |
| * If we need to grow the block size then lock the whole file range. |
| */ |
| uint64_t end_size = MAX(zp->z_size, new->lr_offset + new->lr_length); |
| if (end_size > zp->z_blksz && (!ISP2(zp->z_blksz) || |
| zp->z_blksz < ZTOZSB(zp)->z_max_blksz)) { |
| new->lr_offset = 0; |
| new->lr_length = UINT64_MAX; |
| } |
| } |
| |
| /*ARGSUSED*/ |
| static int |
| zfs_znode_cache_constructor(void *buf, void *arg, int kmflags) |
| { |
| znode_t *zp = buf; |
| |
| inode_init_once(ZTOI(zp)); |
| list_link_init(&zp->z_link_node); |
| |
| mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL); |
| rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL); |
| rw_init(&zp->z_name_lock, NULL, RW_NOLOCKDEP, NULL); |
| mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL); |
| rw_init(&zp->z_xattr_lock, NULL, RW_DEFAULT, NULL); |
| |
| zfs_rangelock_init(&zp->z_rangelock, zfs_rangelock_cb, zp); |
| |
| zp->z_dirlocks = NULL; |
| zp->z_acl_cached = NULL; |
| zp->z_xattr_cached = NULL; |
| zp->z_xattr_parent = 0; |
| zp->z_moved = B_FALSE; |
| return (0); |
| } |
| |
| /*ARGSUSED*/ |
| static void |
| zfs_znode_cache_destructor(void *buf, void *arg) |
| { |
| znode_t *zp = buf; |
| |
| ASSERT(!list_link_active(&zp->z_link_node)); |
| mutex_destroy(&zp->z_lock); |
| rw_destroy(&zp->z_parent_lock); |
| rw_destroy(&zp->z_name_lock); |
| mutex_destroy(&zp->z_acl_lock); |
| rw_destroy(&zp->z_xattr_lock); |
| zfs_rangelock_fini(&zp->z_rangelock); |
| |
| ASSERT(zp->z_dirlocks == NULL); |
| ASSERT(zp->z_acl_cached == NULL); |
| ASSERT(zp->z_xattr_cached == NULL); |
| } |
| |
| static int |
| zfs_znode_hold_cache_constructor(void *buf, void *arg, int kmflags) |
| { |
| znode_hold_t *zh = buf; |
| |
| mutex_init(&zh->zh_lock, NULL, MUTEX_DEFAULT, NULL); |
| zfs_refcount_create(&zh->zh_refcount); |
| zh->zh_obj = ZFS_NO_OBJECT; |
| |
| return (0); |
| } |
| |
| static void |
| zfs_znode_hold_cache_destructor(void *buf, void *arg) |
| { |
| znode_hold_t *zh = buf; |
| |
| mutex_destroy(&zh->zh_lock); |
| zfs_refcount_destroy(&zh->zh_refcount); |
| } |
| |
| void |
| zfs_znode_init(void) |
| { |
| /* |
| * Initialize zcache. The KMC_SLAB hint is used in order that it be |
| * backed by kmalloc() when on the Linux slab in order that any |
| * wait_on_bit() operations on the related inode operate properly. |
| */ |
| 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, KMC_SLAB); |
| |
| ASSERT(znode_hold_cache == NULL); |
| znode_hold_cache = kmem_cache_create("zfs_znode_hold_cache", |
| sizeof (znode_hold_t), 0, zfs_znode_hold_cache_constructor, |
| zfs_znode_hold_cache_destructor, NULL, NULL, NULL, 0); |
| } |
| |
| void |
| zfs_znode_fini(void) |
| { |
| /* |
| * Cleanup zcache |
| */ |
| if (znode_cache) |
| kmem_cache_destroy(znode_cache); |
| znode_cache = NULL; |
| |
| if (znode_hold_cache) |
| kmem_cache_destroy(znode_hold_cache); |
| znode_hold_cache = NULL; |
| } |
| |
| /* |
| * The zfs_znode_hold_enter() / zfs_znode_hold_exit() functions are used to |
| * serialize access to a znode and its SA buffer while the object is being |
| * created or destroyed. This kind of locking would normally reside in the |
| * znode itself but in this case that's impossible because the znode and SA |
| * buffer may not yet exist. Therefore the locking is handled externally |
| * with an array of mutexs and AVLs trees which contain per-object locks. |
| * |
| * In zfs_znode_hold_enter() a per-object lock is created as needed, inserted |
| * in to the correct AVL tree and finally the per-object lock is held. In |
| * zfs_znode_hold_exit() the process is reversed. The per-object lock is |
| * released, removed from the AVL tree and destroyed if there are no waiters. |
| * |
| * This scheme has two important properties: |
| * |
| * 1) No memory allocations are performed while holding one of the z_hold_locks. |
| * This ensures evict(), which can be called from direct memory reclaim, will |
| * never block waiting on a z_hold_locks which just happens to have hashed |
| * to the same index. |
| * |
| * 2) All locks used to serialize access to an object are per-object and never |
| * shared. This minimizes lock contention without creating a large number |
| * of dedicated locks. |
| * |
| * On the downside it does require znode_lock_t structures to be frequently |
| * allocated and freed. However, because these are backed by a kmem cache |
| * and very short lived this cost is minimal. |
| */ |
| int |
| zfs_znode_hold_compare(const void *a, const void *b) |
| { |
| const znode_hold_t *zh_a = (const znode_hold_t *)a; |
| const znode_hold_t *zh_b = (const znode_hold_t *)b; |
| |
| return (AVL_CMP(zh_a->zh_obj, zh_b->zh_obj)); |
| } |
| |
| boolean_t |
| zfs_znode_held(zfsvfs_t *zfsvfs, uint64_t obj) |
| { |
| znode_hold_t *zh, search; |
| int i = ZFS_OBJ_HASH(zfsvfs, obj); |
| boolean_t held; |
| |
| search.zh_obj = obj; |
| |
| mutex_enter(&zfsvfs->z_hold_locks[i]); |
| zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL); |
| held = (zh && MUTEX_HELD(&zh->zh_lock)) ? B_TRUE : B_FALSE; |
| mutex_exit(&zfsvfs->z_hold_locks[i]); |
| |
| return (held); |
| } |
| |
| static znode_hold_t * |
| zfs_znode_hold_enter(zfsvfs_t *zfsvfs, uint64_t obj) |
| { |
| znode_hold_t *zh, *zh_new, search; |
| int i = ZFS_OBJ_HASH(zfsvfs, obj); |
| boolean_t found = B_FALSE; |
| |
| zh_new = kmem_cache_alloc(znode_hold_cache, KM_SLEEP); |
| zh_new->zh_obj = obj; |
| search.zh_obj = obj; |
| |
| mutex_enter(&zfsvfs->z_hold_locks[i]); |
| zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL); |
| if (likely(zh == NULL)) { |
| zh = zh_new; |
| avl_add(&zfsvfs->z_hold_trees[i], zh); |
| } else { |
| ASSERT3U(zh->zh_obj, ==, obj); |
| found = B_TRUE; |
| } |
| zfs_refcount_add(&zh->zh_refcount, NULL); |
| mutex_exit(&zfsvfs->z_hold_locks[i]); |
| |
| if (found == B_TRUE) |
| kmem_cache_free(znode_hold_cache, zh_new); |
| |
| ASSERT(MUTEX_NOT_HELD(&zh->zh_lock)); |
| ASSERT3S(zfs_refcount_count(&zh->zh_refcount), >, 0); |
| mutex_enter(&zh->zh_lock); |
| |
| return (zh); |
| } |
| |
| static void |
| zfs_znode_hold_exit(zfsvfs_t *zfsvfs, znode_hold_t *zh) |
| { |
| int i = ZFS_OBJ_HASH(zfsvfs, zh->zh_obj); |
| boolean_t remove = B_FALSE; |
| |
| ASSERT(zfs_znode_held(zfsvfs, zh->zh_obj)); |
| ASSERT3S(zfs_refcount_count(&zh->zh_refcount), >, 0); |
| mutex_exit(&zh->zh_lock); |
| |
| mutex_enter(&zfsvfs->z_hold_locks[i]); |
| if (zfs_refcount_remove(&zh->zh_refcount, NULL) == 0) { |
| avl_remove(&zfsvfs->z_hold_trees[i], zh); |
| remove = B_TRUE; |
| } |
| mutex_exit(&zfsvfs->z_hold_locks[i]); |
| |
| if (remove == B_TRUE) |
| kmem_cache_free(znode_hold_cache, zh); |
| } |
| |
| static void |
| zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp, |
| dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl) |
| { |
| ASSERT(zfs_znode_held(zfsvfs, zp->z_id)); |
| |
| mutex_enter(&zp->z_lock); |
| |
| ASSERT(zp->z_sa_hdl == NULL); |
| ASSERT(zp->z_acl_cached == NULL); |
| if (sa_hdl == NULL) { |
| VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp, |
| SA_HDL_SHARED, &zp->z_sa_hdl)); |
| } else { |
| zp->z_sa_hdl = sa_hdl; |
| sa_set_userp(sa_hdl, zp); |
| } |
| |
| zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE; |
| |
| mutex_exit(&zp->z_lock); |
| } |
| |
| void |
| zfs_znode_dmu_fini(znode_t *zp) |
| { |
| ASSERT(zfs_znode_held(ZTOZSB(zp), zp->z_id) || zp->z_unlinked || |
| RW_WRITE_HELD(&ZTOZSB(zp)->z_teardown_inactive_lock)); |
| |
| sa_handle_destroy(zp->z_sa_hdl); |
| zp->z_sa_hdl = NULL; |
| } |
| |
| /* |
| * Called by new_inode() to allocate a new inode. |
| */ |
| int |
| zfs_inode_alloc(struct super_block *sb, struct inode **ip) |
| { |
| znode_t *zp; |
| |
| zp = kmem_cache_alloc(znode_cache, KM_SLEEP); |
| *ip = ZTOI(zp); |
| |
| return (0); |
| } |
| |
| /* |
| * Called in multiple places when an inode should be destroyed. |
| */ |
| void |
| zfs_inode_destroy(struct inode *ip) |
| { |
| znode_t *zp = ITOZ(ip); |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| |
| mutex_enter(&zfsvfs->z_znodes_lock); |
| if (list_link_active(&zp->z_link_node)) { |
| list_remove(&zfsvfs->z_all_znodes, zp); |
| zfsvfs->z_nr_znodes--; |
| } |
| mutex_exit(&zfsvfs->z_znodes_lock); |
| |
| if (zp->z_acl_cached) { |
| zfs_acl_free(zp->z_acl_cached); |
| zp->z_acl_cached = NULL; |
| } |
| |
| if (zp->z_xattr_cached) { |
| nvlist_free(zp->z_xattr_cached); |
| zp->z_xattr_cached = NULL; |
| } |
| |
| kmem_cache_free(znode_cache, zp); |
| } |
| |
| static void |
| zfs_inode_set_ops(zfsvfs_t *zfsvfs, struct inode *ip) |
| { |
| uint64_t rdev = 0; |
| |
| switch (ip->i_mode & S_IFMT) { |
| case S_IFREG: |
| ip->i_op = &zpl_inode_operations; |
| ip->i_fop = &zpl_file_operations; |
| ip->i_mapping->a_ops = &zpl_address_space_operations; |
| break; |
| |
| case S_IFDIR: |
| ip->i_op = &zpl_dir_inode_operations; |
| ip->i_fop = &zpl_dir_file_operations; |
| ITOZ(ip)->z_zn_prefetch = B_TRUE; |
| break; |
| |
| case S_IFLNK: |
| ip->i_op = &zpl_symlink_inode_operations; |
| break; |
| |
| /* |
| * rdev is only stored in a SA only for device files. |
| */ |
| case S_IFCHR: |
| case S_IFBLK: |
| (void) sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), &rdev, |
| sizeof (rdev)); |
| /*FALLTHROUGH*/ |
| case S_IFIFO: |
| case S_IFSOCK: |
| init_special_inode(ip, ip->i_mode, rdev); |
| ip->i_op = &zpl_special_inode_operations; |
| break; |
| |
| default: |
| zfs_panic_recover("inode %llu has invalid mode: 0x%x\n", |
| (u_longlong_t)ip->i_ino, ip->i_mode); |
| |
| /* Assume the inode is a file and attempt to continue */ |
| ip->i_mode = S_IFREG | 0644; |
| ip->i_op = &zpl_inode_operations; |
| ip->i_fop = &zpl_file_operations; |
| ip->i_mapping->a_ops = &zpl_address_space_operations; |
| break; |
| } |
| } |
| |
| void |
| zfs_set_inode_flags(znode_t *zp, struct inode *ip) |
| { |
| /* |
| * Linux and Solaris have different sets of file attributes, so we |
| * restrict this conversion to the intersection of the two. |
| */ |
| #ifdef HAVE_INODE_SET_FLAGS |
| unsigned int flags = 0; |
| if (zp->z_pflags & ZFS_IMMUTABLE) |
| flags |= S_IMMUTABLE; |
| if (zp->z_pflags & ZFS_APPENDONLY) |
| flags |= S_APPEND; |
| |
| inode_set_flags(ip, flags, S_IMMUTABLE|S_APPEND); |
| #else |
| if (zp->z_pflags & ZFS_IMMUTABLE) |
| ip->i_flags |= S_IMMUTABLE; |
| else |
| ip->i_flags &= ~S_IMMUTABLE; |
| |
| if (zp->z_pflags & ZFS_APPENDONLY) |
| ip->i_flags |= S_APPEND; |
| else |
| ip->i_flags &= ~S_APPEND; |
| #endif |
| } |
| |
| /* |
| * Update the embedded inode given the znode. We should work toward |
| * eliminating this function as soon as possible by removing values |
| * which are duplicated between the znode and inode. If the generic |
| * inode has the correct field it should be used, and the ZFS code |
| * updated to access the inode. This can be done incrementally. |
| */ |
| void |
| zfs_inode_update(znode_t *zp) |
| { |
| zfsvfs_t *zfsvfs; |
| struct inode *ip; |
| uint32_t blksize; |
| u_longlong_t i_blocks; |
| |
| ASSERT(zp != NULL); |
| zfsvfs = ZTOZSB(zp); |
| ip = ZTOI(zp); |
| |
| /* Skip .zfs control nodes which do not exist on disk. */ |
| if (zfsctl_is_node(ip)) |
| return; |
| |
| dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &blksize, &i_blocks); |
| |
| spin_lock(&ip->i_lock); |
| ip->i_blocks = i_blocks; |
| i_size_write(ip, zp->z_size); |
| spin_unlock(&ip->i_lock); |
| } |
| |
| |
| /* |
| * Construct a znode+inode and initialize. |
| * |
| * 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, |
| dmu_object_type_t obj_type, sa_handle_t *hdl) |
| { |
| znode_t *zp; |
| struct inode *ip; |
| uint64_t mode; |
| uint64_t parent; |
| uint64_t tmp_gen; |
| uint64_t links; |
| uint64_t z_uid, z_gid; |
| uint64_t atime[2], mtime[2], ctime[2]; |
| uint64_t projid = ZFS_DEFAULT_PROJID; |
| sa_bulk_attr_t bulk[11]; |
| int count = 0; |
| |
| ASSERT(zfsvfs != NULL); |
| |
| ip = new_inode(zfsvfs->z_sb); |
| if (ip == NULL) |
| return (NULL); |
| |
| zp = ITOZ(ip); |
| ASSERT(zp->z_dirlocks == NULL); |
| ASSERT3P(zp->z_acl_cached, ==, NULL); |
| ASSERT3P(zp->z_xattr_cached, ==, NULL); |
| zp->z_unlinked = B_FALSE; |
| zp->z_atime_dirty = B_FALSE; |
| zp->z_moved = B_FALSE; |
| zp->z_is_mapped = B_FALSE; |
| zp->z_is_ctldir = B_FALSE; |
| zp->z_is_stale = B_FALSE; |
| zp->z_sa_hdl = NULL; |
| zp->z_mapcnt = 0; |
| zp->z_id = db->db_object; |
| zp->z_blksz = blksz; |
| zp->z_seq = 0x7A4653; |
| zp->z_sync_cnt = 0; |
| |
| zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl); |
| |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &tmp_gen, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, |
| &zp->z_size, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, |
| &zp->z_pflags, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, |
| &parent, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, &z_uid, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, &z_gid, 8); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); |
| |
| if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || tmp_gen == 0 || |
| (dmu_objset_projectquota_enabled(zfsvfs->z_os) && |
| (zp->z_pflags & ZFS_PROJID) && |
| sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs), &projid, 8) != 0)) { |
| if (hdl == NULL) |
| sa_handle_destroy(zp->z_sa_hdl); |
| zp->z_sa_hdl = NULL; |
| goto error; |
| } |
| |
| zp->z_projid = projid; |
| zp->z_mode = ip->i_mode = mode; |
| ip->i_generation = (uint32_t)tmp_gen; |
| ip->i_blkbits = SPA_MINBLOCKSHIFT; |
| set_nlink(ip, (uint32_t)links); |
| zfs_uid_write(ip, z_uid); |
| zfs_gid_write(ip, z_gid); |
| zfs_set_inode_flags(zp, ip); |
| |
| /* Cache the xattr parent id */ |
| if (zp->z_pflags & ZFS_XATTR) |
| zp->z_xattr_parent = parent; |
| |
| ZFS_TIME_DECODE(&ip->i_atime, atime); |
| ZFS_TIME_DECODE(&ip->i_mtime, mtime); |
| ZFS_TIME_DECODE(&ip->i_ctime, ctime); |
| |
| ip->i_ino = zp->z_id; |
| zfs_inode_update(zp); |
| zfs_inode_set_ops(zfsvfs, ip); |
| |
| /* |
| * The only way insert_inode_locked() can fail is if the ip->i_ino |
| * number is already hashed for this super block. This can never |
| * happen because the inode numbers map 1:1 with the object numbers. |
| * |
| * The one exception is rolling back a mounted file system, but in |
| * this case all the active inode are unhashed during the rollback. |
| */ |
| VERIFY3S(insert_inode_locked(ip), ==, 0); |
| |
| mutex_enter(&zfsvfs->z_znodes_lock); |
| list_insert_tail(&zfsvfs->z_all_znodes, zp); |
| zfsvfs->z_nr_znodes++; |
| membar_producer(); |
| mutex_exit(&zfsvfs->z_znodes_lock); |
| |
| unlock_new_inode(ip); |
| return (zp); |
| |
| error: |
| iput(ip); |
| return (NULL); |
| } |
| |
| /* |
| * Safely mark an inode dirty. Inodes which are part of a read-only |
| * file system or snapshot may not be dirtied. |
| */ |
| void |
| zfs_mark_inode_dirty(struct inode *ip) |
| { |
| zfsvfs_t *zfsvfs = ITOZSB(ip); |
| |
| if (zfs_is_readonly(zfsvfs) || dmu_objset_is_snapshot(zfsvfs->z_os)) |
| return; |
| |
| mark_inode_dirty(ip); |
| } |
| |
| static uint64_t empty_xattr; |
| static uint64_t pad[4]; |
| static zfs_acl_phys_t acl_phys; |
| /* |
| * 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_TMPFILE - new object is of O_TMPFILE |
| * IS_XATTR - new object is an attribute |
| * acl_ids - ACL related attributes |
| * |
| * OUT: zpp - allocated znode (set to dzp if IS_ROOT_NODE) |
| * |
| */ |
| void |
| zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, |
| uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids) |
| { |
| uint64_t crtime[2], atime[2], mtime[2], ctime[2]; |
| uint64_t mode, size, links, parent, pflags; |
| uint64_t projid = ZFS_DEFAULT_PROJID; |
| uint64_t rdev = 0; |
| zfsvfs_t *zfsvfs = ZTOZSB(dzp); |
| dmu_buf_t *db; |
| inode_timespec_t now; |
| uint64_t gen, obj; |
| int bonuslen; |
| int dnodesize; |
| sa_handle_t *sa_hdl; |
| dmu_object_type_t obj_type; |
| sa_bulk_attr_t *sa_attrs; |
| int cnt = 0; |
| zfs_acl_locator_cb_t locate = { 0 }; |
| znode_hold_t *zh; |
| |
| if (zfsvfs->z_replay) { |
| obj = vap->va_nodeid; |
| now = vap->va_ctime; /* see zfs_replay_create() */ |
| gen = vap->va_nblocks; /* ditto */ |
| dnodesize = vap->va_fsid; /* ditto */ |
| } else { |
| obj = 0; |
| gethrestime(&now); |
| gen = dmu_tx_get_txg(tx); |
| dnodesize = dmu_objset_dnodesize(zfsvfs->z_os); |
| } |
| |
| if (dnodesize == 0) |
| dnodesize = DNODE_MIN_SIZE; |
| |
| obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE; |
| |
| bonuslen = (obj_type == DMU_OT_SA) ? |
| DN_BONUS_SIZE(dnodesize) : ZFS_OLD_ZNODE_PHYS_SIZE; |
| |
| /* |
| * Create a new DMU object. |
| */ |
| /* |
| * There's currently no mechanism for pre-reading the blocks that will |
| * be needed to 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 (S_ISDIR(vap->va_mode)) { |
| if (zfsvfs->z_replay) { |
| VERIFY0(zap_create_claim_norm_dnsize(zfsvfs->z_os, obj, |
| zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, |
| obj_type, bonuslen, dnodesize, tx)); |
| } else { |
| obj = zap_create_norm_dnsize(zfsvfs->z_os, |
| zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, |
| obj_type, bonuslen, dnodesize, tx); |
| } |
| } else { |
| if (zfsvfs->z_replay) { |
| VERIFY0(dmu_object_claim_dnsize(zfsvfs->z_os, obj, |
| DMU_OT_PLAIN_FILE_CONTENTS, 0, |
| obj_type, bonuslen, dnodesize, tx)); |
| } else { |
| obj = dmu_object_alloc_dnsize(zfsvfs->z_os, |
| DMU_OT_PLAIN_FILE_CONTENTS, 0, |
| obj_type, bonuslen, dnodesize, tx); |
| } |
| } |
| |
| zh = zfs_znode_hold_enter(zfsvfs, obj); |
| VERIFY0(sa_buf_hold(zfsvfs->z_os, obj, NULL, &db)); |
| |
| /* |
| * 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_id = obj; |
| } |
| |
| /* |
| * If parent is an xattr, so am I. |
| */ |
| if (dzp->z_pflags & ZFS_XATTR) { |
| flag |= IS_XATTR; |
| } |
| |
| if (zfsvfs->z_use_fuids) |
| pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; |
| else |
| pflags = 0; |
| |
| if (S_ISDIR(vap->va_mode)) { |
| size = 2; /* contents ("." and "..") */ |
| links = 2; |
| } else { |
| size = 0; |
| links = (flag & IS_TMPFILE) ? 0 : 1; |
| } |
| |
| if (S_ISBLK(vap->va_mode) || S_ISCHR(vap->va_mode)) |
| rdev = vap->va_rdev; |
| |
| parent = dzp->z_id; |
| mode = acl_ids->z_mode; |
| if (flag & IS_XATTR) |
| pflags |= ZFS_XATTR; |
| |
| if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode)) { |
| /* |
| * With ZFS_PROJID flag, we can easily know whether there is |
| * project ID stored on disk or not. See zfs_space_delta_cb(). |
| */ |
| if (obj_type != DMU_OT_ZNODE && |
| dmu_objset_projectquota_enabled(zfsvfs->z_os)) |
| pflags |= ZFS_PROJID; |
| |
| /* |
| * Inherit project ID from parent if required. |
| */ |
| projid = zfs_inherit_projid(dzp); |
| if (dzp->z_pflags & ZFS_PROJINHERIT) |
| pflags |= ZFS_PROJINHERIT; |
| } |
| |
| /* |
| * No execs denied will be determined when zfs_mode_compute() is called. |
| */ |
| pflags |= acl_ids->z_aclp->z_hints & |
| (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT| |
| ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED); |
| |
| ZFS_TIME_ENCODE(&now, crtime); |
| ZFS_TIME_ENCODE(&now, ctime); |
| |
| if (vap->va_mask & ATTR_ATIME) { |
| ZFS_TIME_ENCODE(&vap->va_atime, atime); |
| } else { |
| ZFS_TIME_ENCODE(&now, atime); |
| } |
| |
| if (vap->va_mask & ATTR_MTIME) { |
| ZFS_TIME_ENCODE(&vap->va_mtime, mtime); |
| } else { |
| ZFS_TIME_ENCODE(&now, mtime); |
| } |
| |
| /* Now add in all of the "SA" attributes */ |
| VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED, |
| &sa_hdl)); |
| |
| /* |
| * Setup the array of attributes to be replaced/set on the new file |
| * |
| * order for DMU_OT_ZNODE is critical since it needs to be constructed |
| * in the old znode_phys_t format. Don't change this ordering |
| */ |
| sa_attrs = kmem_alloc(sizeof (sa_bulk_attr_t) * ZPL_END, KM_SLEEP); |
| |
| if (obj_type == DMU_OT_ZNODE) { |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), |
| NULL, &atime, 16); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), |
| NULL, &mtime, 16); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), |
| NULL, &ctime, 16); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), |
| NULL, &crtime, 16); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), |
| NULL, &gen, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), |
| NULL, &mode, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), |
| NULL, &size, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), |
| NULL, &parent, 8); |
| } else { |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), |
| NULL, &mode, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), |
| NULL, &size, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), |
| NULL, &gen, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), |
| NULL, &acl_ids->z_fuid, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), |
| NULL, &acl_ids->z_fgid, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), |
| NULL, &parent, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), |
| NULL, &pflags, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), |
| NULL, &atime, 16); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), |
| NULL, &mtime, 16); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), |
| NULL, &ctime, 16); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), |
| NULL, &crtime, 16); |
| } |
| |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8); |
| |
| if (obj_type == DMU_OT_ZNODE) { |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL, |
| &empty_xattr, 8); |
| } else if (dmu_objset_projectquota_enabled(zfsvfs->z_os) && |
| pflags & ZFS_PROJID) { |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PROJID(zfsvfs), |
| NULL, &projid, 8); |
| } |
| if (obj_type == DMU_OT_ZNODE || |
| (S_ISBLK(vap->va_mode) || S_ISCHR(vap->va_mode))) { |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs), |
| NULL, &rdev, 8); |
| } |
| if (obj_type == DMU_OT_ZNODE) { |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), |
| NULL, &pflags, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, |
| &acl_ids->z_fuid, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, |
| &acl_ids->z_fgid, 8); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad, |
| sizeof (uint64_t) * 4); |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL, |
| &acl_phys, sizeof (zfs_acl_phys_t)); |
| } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) { |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL, |
| &acl_ids->z_aclp->z_acl_count, 8); |
| locate.cb_aclp = acl_ids->z_aclp; |
| SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs), |
| zfs_acl_data_locator, &locate, |
| acl_ids->z_aclp->z_acl_bytes); |
| mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags, |
| acl_ids->z_fuid, acl_ids->z_fgid); |
| } |
| |
| VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0); |
| |
| if (!(flag & IS_ROOT_NODE)) { |
| /* |
| * The call to zfs_znode_alloc() may fail if memory is low |
| * via the call path: alloc_inode() -> inode_init_always() -> |
| * security_inode_alloc() -> inode_alloc_security(). Since |
| * the existing code is written such that zfs_mknode() can |
| * not fail retry until sufficient memory has been reclaimed. |
| */ |
| do { |
| *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl); |
| } while (*zpp == NULL); |
| |
| VERIFY(*zpp != NULL); |
| VERIFY(dzp != NULL); |
| } else { |
| /* |
| * If we are creating the root node, the "parent" we |
| * passed in is the znode for the root. |
| */ |
| *zpp = dzp; |
| |
| (*zpp)->z_sa_hdl = sa_hdl; |
| } |
| |
| (*zpp)->z_pflags = pflags; |
| (*zpp)->z_mode = ZTOI(*zpp)->i_mode = mode; |
| (*zpp)->z_dnodesize = dnodesize; |
| (*zpp)->z_projid = projid; |
| |
| if (obj_type == DMU_OT_ZNODE || |
| acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) { |
| VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx)); |
| } |
| kmem_free(sa_attrs, sizeof (sa_bulk_attr_t) * ZPL_END); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| } |
| |
| /* |
| * Update in-core attributes. It is assumed the caller will be doing an |
| * sa_bulk_update to push the changes out. |
| */ |
| void |
| zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx) |
| { |
| xoptattr_t *xoap; |
| boolean_t update_inode = B_FALSE; |
| |
| xoap = xva_getxoptattr(xvap); |
| ASSERT(xoap); |
| |
| if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { |
| uint64_t times[2]; |
| ZFS_TIME_ENCODE(&xoap->xoa_createtime, times); |
| (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)), |
| ×, sizeof (times), tx); |
| XVA_SET_RTN(xvap, XAT_CREATETIME); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { |
| ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_READONLY); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { |
| ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_HIDDEN); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { |
| ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_SYSTEM); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { |
| ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_ARCHIVE); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { |
| ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_IMMUTABLE); |
| |
| update_inode = B_TRUE; |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { |
| ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_NOUNLINK); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { |
| ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_APPENDONLY); |
| |
| update_inode = B_TRUE; |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { |
| ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_NODUMP); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { |
| ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque, |
| zp->z_pflags, tx); |
| 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, zp->z_pflags, tx); |
| 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, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_AV_MODIFIED); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { |
| zfs_sa_set_scanstamp(zp, xvap, tx); |
| XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { |
| ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_REPARSE); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { |
| ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_OFFLINE); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { |
| ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_SPARSE); |
| } |
| if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) { |
| ZFS_ATTR_SET(zp, ZFS_PROJINHERIT, xoap->xoa_projinherit, |
| zp->z_pflags, tx); |
| XVA_SET_RTN(xvap, XAT_PROJINHERIT); |
| } |
| |
| if (update_inode) |
| zfs_set_inode_flags(zp, ZTOI(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; |
| znode_hold_t *zh; |
| int err; |
| sa_handle_t *hdl; |
| |
| *zpp = NULL; |
| |
| again: |
| zh = zfs_znode_hold_enter(zfsvfs, obj_num); |
| |
| err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); |
| if (err) { |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (err); |
| } |
| |
| dmu_object_info_from_db(db, &doi); |
| if (doi.doi_bonus_type != DMU_OT_SA && |
| (doi.doi_bonus_type != DMU_OT_ZNODE || |
| (doi.doi_bonus_type == DMU_OT_ZNODE && |
| doi.doi_bonus_size < sizeof (znode_phys_t)))) { |
| sa_buf_rele(db, NULL); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (SET_ERROR(EINVAL)); |
| } |
| |
| hdl = dmu_buf_get_user(db); |
| if (hdl != NULL) { |
| zp = sa_get_userdata(hdl); |
| |
| |
| /* |
| * Since "SA" does immediate eviction we |
| * should never find a sa handle that doesn't |
| * know about the znode. |
| */ |
| |
| ASSERT3P(zp, !=, NULL); |
| |
| mutex_enter(&zp->z_lock); |
| ASSERT3U(zp->z_id, ==, obj_num); |
| /* |
| * If zp->z_unlinked is set, the znode is already marked |
| * for deletion and should not be discovered. Check this |
| * after checking igrab() due to fsetxattr() & O_TMPFILE. |
| * |
| * If igrab() returns NULL the VFS has independently |
| * determined the inode should be evicted and has |
| * called iput_final() to start the eviction process. |
| * The SA handle is still valid but because the VFS |
| * requires that the eviction succeed we must drop |
| * our locks and references to allow the eviction to |
| * complete. The zfs_zget() may then be retried. |
| * |
| * This unlikely case could be optimized by registering |
| * a sops->drop_inode() callback. The callback would |
| * need to detect the active SA hold thereby informing |
| * the VFS that this inode should not be evicted. |
| */ |
| if (igrab(ZTOI(zp)) == NULL) { |
| if (zp->z_unlinked) |
| err = SET_ERROR(ENOENT); |
| else |
| err = SET_ERROR(EAGAIN); |
| } else { |
| *zpp = zp; |
| err = 0; |
| } |
| |
| mutex_exit(&zp->z_lock); |
| sa_buf_rele(db, NULL); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| |
| if (err == EAGAIN) { |
| /* inode might need this to finish evict */ |
| cond_resched(); |
| goto again; |
| } |
| return (err); |
| } |
| |
| /* |
| * Not found create new znode/vnode but only if file exists. |
| * |
| * There is a small window where zfs_vget() could |
| * find this object while a file create is still in |
| * progress. This is checked for in zfs_znode_alloc() |
| * |
| * if zfs_znode_alloc() fails it will drop the hold on the |
| * bonus buffer. |
| */ |
| zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size, |
| doi.doi_bonus_type, NULL); |
| if (zp == NULL) { |
| err = SET_ERROR(ENOENT); |
| } else { |
| *zpp = zp; |
| } |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (err); |
| } |
| |
| int |
| zfs_rezget(znode_t *zp) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| dmu_object_info_t doi; |
| dmu_buf_t *db; |
| uint64_t obj_num = zp->z_id; |
| uint64_t mode; |
| uint64_t links; |
| sa_bulk_attr_t bulk[10]; |
| int err; |
| int count = 0; |
| uint64_t gen; |
| uint64_t z_uid, z_gid; |
| uint64_t atime[2], mtime[2], ctime[2]; |
| uint64_t projid = ZFS_DEFAULT_PROJID; |
| znode_hold_t *zh; |
| |
| /* |
| * skip ctldir, otherwise they will always get invalidated. This will |
| * cause funny behaviour for the mounted snapdirs. Especially for |
| * Linux >= 3.18, d_invalidate will detach the mountpoint and prevent |
| * anyone automount it again as long as someone is still using the |
| * detached mount. |
| */ |
| if (zp->z_is_ctldir) |
| return (0); |
| |
| zh = zfs_znode_hold_enter(zfsvfs, obj_num); |
| |
| mutex_enter(&zp->z_acl_lock); |
| if (zp->z_acl_cached) { |
| zfs_acl_free(zp->z_acl_cached); |
| zp->z_acl_cached = NULL; |
| } |
| mutex_exit(&zp->z_acl_lock); |
| |
| rw_enter(&zp->z_xattr_lock, RW_WRITER); |
| if (zp->z_xattr_cached) { |
| nvlist_free(zp->z_xattr_cached); |
| zp->z_xattr_cached = NULL; |
| } |
| rw_exit(&zp->z_xattr_lock); |
| |
| ASSERT(zp->z_sa_hdl == NULL); |
| err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); |
| if (err) { |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (err); |
| } |
| |
| dmu_object_info_from_db(db, &doi); |
| if (doi.doi_bonus_type != DMU_OT_SA && |
| (doi.doi_bonus_type != DMU_OT_ZNODE || |
| (doi.doi_bonus_type == DMU_OT_ZNODE && |
| doi.doi_bonus_size < sizeof (znode_phys_t)))) { |
| sa_buf_rele(db, NULL); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (SET_ERROR(EINVAL)); |
| } |
| |
| zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL); |
| |
| /* reload cached values */ |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, |
| &gen, sizeof (gen)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, |
| &zp->z_size, sizeof (zp->z_size)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, |
| &links, sizeof (links)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, |
| &zp->z_pflags, sizeof (zp->z_pflags)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, |
| &z_uid, sizeof (z_uid)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, |
| &z_gid, sizeof (z_gid)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, |
| &mode, sizeof (mode)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, |
| &atime, 16); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, |
| &mtime, 16); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, |
| &ctime, 16); |
| |
| if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) { |
| zfs_znode_dmu_fini(zp); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (SET_ERROR(EIO)); |
| } |
| |
| if (dmu_objset_projectquota_enabled(zfsvfs->z_os)) { |
| err = sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs), |
| &projid, 8); |
| if (err != 0 && err != ENOENT) { |
| zfs_znode_dmu_fini(zp); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (SET_ERROR(err)); |
| } |
| } |
| |
| zp->z_projid = projid; |
| zp->z_mode = ZTOI(zp)->i_mode = mode; |
| zfs_uid_write(ZTOI(zp), z_uid); |
| zfs_gid_write(ZTOI(zp), z_gid); |
| |
| ZFS_TIME_DECODE(&ZTOI(zp)->i_atime, atime); |
| ZFS_TIME_DECODE(&ZTOI(zp)->i_mtime, mtime); |
| ZFS_TIME_DECODE(&ZTOI(zp)->i_ctime, ctime); |
| |
| if ((uint32_t)gen != ZTOI(zp)->i_generation) { |
| zfs_znode_dmu_fini(zp); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| return (SET_ERROR(EIO)); |
| } |
| |
| set_nlink(ZTOI(zp), (uint32_t)links); |
| zfs_set_inode_flags(zp, ZTOI(zp)); |
| |
| zp->z_blksz = doi.doi_data_block_size; |
| zp->z_atime_dirty = B_FALSE; |
| zfs_inode_update(zp); |
| |
| /* |
| * If the file has zero links, then it has been unlinked on the send |
| * side and it must be in the received unlinked set. |
| * We call zfs_znode_dmu_fini() now to prevent any accesses to the |
| * stale data and to prevent automatic removal of the file in |
| * zfs_zinactive(). The file will be removed either when it is removed |
| * on the send side and the next incremental stream is received or |
| * when the unlinked set gets processed. |
| */ |
| zp->z_unlinked = (ZTOI(zp)->i_nlink == 0); |
| if (zp->z_unlinked) |
| zfs_znode_dmu_fini(zp); |
| |
| zfs_znode_hold_exit(zfsvfs, zh); |
| |
| return (0); |
| } |
| |
| void |
| zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| objset_t *os = zfsvfs->z_os; |
| uint64_t obj = zp->z_id; |
| uint64_t acl_obj = zfs_external_acl(zp); |
| znode_hold_t *zh; |
| |
| zh = zfs_znode_hold_enter(zfsvfs, obj); |
| if (acl_obj) { |
| VERIFY(!zp->z_is_sa); |
| VERIFY(0 == dmu_object_free(os, acl_obj, tx)); |
| } |
| VERIFY(0 == dmu_object_free(os, obj, tx)); |
| zfs_znode_dmu_fini(zp); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| } |
| |
| void |
| zfs_zinactive(znode_t *zp) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| uint64_t z_id = zp->z_id; |
| znode_hold_t *zh; |
| |
| ASSERT(zp->z_sa_hdl); |
| |
| /* |
| * Don't allow a zfs_zget() while were trying to release this znode. |
| */ |
| zh = zfs_znode_hold_enter(zfsvfs, z_id); |
| |
| mutex_enter(&zp->z_lock); |
| |
| /* |
| * If this was the last reference to a file with no links, remove |
| * the file from the file system unless the file system is mounted |
| * read-only. That can happen, for example, if the file system was |
| * originally read-write, the file was opened, then unlinked and |
| * the file system was made read-only before the file was finally |
| * closed. The file will remain in the unlinked set. |
| */ |
| if (zp->z_unlinked) { |
| ASSERT(!zfsvfs->z_issnap); |
| if (!zfs_is_readonly(zfsvfs) && !zfs_unlink_suspend_progress) { |
| mutex_exit(&zp->z_lock); |
| zfs_znode_hold_exit(zfsvfs, zh); |
| zfs_rmnode(zp); |
| return; |
| } |
| } |
| |
| mutex_exit(&zp->z_lock); |
| zfs_znode_dmu_fini(zp); |
| |
| zfs_znode_hold_exit(zfsvfs, zh); |
| } |
| |
| #if defined(HAVE_INODE_TIMESPEC64_TIMES) |
| #define zfs_compare_timespec timespec64_compare |
| #else |
| #define zfs_compare_timespec timespec_compare |
| #endif |
| |
| /* |
| * Determine whether the znode's atime must be updated. The logic mostly |
| * duplicates the Linux kernel's relatime_need_update() functionality. |
| * This function is only called if the underlying filesystem actually has |
| * atime updates enabled. |
| */ |
| boolean_t |
| zfs_relatime_need_update(const struct inode *ip) |
| { |
| inode_timespec_t now; |
| |
| gethrestime(&now); |
| /* |
| * In relatime mode, only update the atime if the previous atime |
| * is earlier than either the ctime or mtime or if at least a day |
| * has passed since the last update of atime. |
| */ |
| if (zfs_compare_timespec(&ip->i_mtime, &ip->i_atime) >= 0) |
| return (B_TRUE); |
| |
| if (zfs_compare_timespec(&ip->i_ctime, &ip->i_atime) >= 0) |
| return (B_TRUE); |
| |
| if ((hrtime_t)now.tv_sec - (hrtime_t)ip->i_atime.tv_sec >= 24*60*60) |
| return (B_TRUE); |
| |
| return (B_FALSE); |
| } |
| |
| /* |
| * Prepare to update znode time stamps. |
| * |
| * IN: zp - znode requiring timestamp update |
| * flag - ATTR_MTIME, ATTR_CTIME flags |
| * |
| * OUT: zp - z_seq |
| * mtime - new mtime |
| * ctime - new ctime |
| * |
| * Note: We don't update atime here, because we rely on Linux VFS to do |
| * atime updating. |
| */ |
| void |
| zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2], |
| uint64_t ctime[2]) |
| { |
| inode_timespec_t now; |
| |
| gethrestime(&now); |
| |
| zp->z_seq++; |
| |
| if (flag & ATTR_MTIME) { |
| ZFS_TIME_ENCODE(&now, mtime); |
| ZFS_TIME_DECODE(&(ZTOI(zp)->i_mtime), mtime); |
| if (ZTOZSB(zp)->z_use_fuids) { |
| zp->z_pflags |= (ZFS_ARCHIVE | |
| ZFS_AV_MODIFIED); |
| } |
| } |
| |
| if (flag & ATTR_CTIME) { |
| ZFS_TIME_ENCODE(&now, ctime); |
| ZFS_TIME_DECODE(&(ZTOI(zp)->i_ctime), ctime); |
| if (ZTOZSB(zp)->z_use_fuids) |
| zp->z_pflags |= ZFS_ARCHIVE; |
| } |
| } |
| |
| /* |
| * 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_size > zp->z_blksz) |
| return; |
| |
| error = dmu_object_set_blocksize(ZTOZSB(zp)->z_os, zp->z_id, |
| size, 0, tx); |
| |
| if (error == ENOTSUP) |
| return; |
| ASSERT0(error); |
| |
| /* What blocksize did we actually get? */ |
| dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy); |
| } |
| |
| /* |
| * Increase the file length |
| * |
| * IN: zp - znode of file to free data in. |
| * end - new end-of-file |
| * |
| * RETURN: 0 on success, error code on failure |
| */ |
| static int |
| zfs_extend(znode_t *zp, uint64_t end) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| dmu_tx_t *tx; |
| zfs_locked_range_t *lr; |
| uint64_t newblksz; |
| int error; |
| |
| /* |
| * We will change zp_size, lock the whole file. |
| */ |
| lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER); |
| |
| /* |
| * Nothing to do if file already at desired length. |
| */ |
| if (end <= zp->z_size) { |
| zfs_rangelock_exit(lr); |
| return (0); |
| } |
| tx = dmu_tx_create(zfsvfs->z_os); |
| dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); |
| zfs_sa_upgrade_txholds(tx, zp); |
| 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 > ZTOZSB(zp)->z_max_blksz) { |
| /* |
| * File's blocksize is already larger than the |
| * "recordsize" property. Only let it grow to |
| * the next power of 2. |
| */ |
| ASSERT(!ISP2(zp->z_blksz)); |
| newblksz = MIN(end, 1 << highbit64(zp->z_blksz)); |
| } else { |
| newblksz = MIN(end, ZTOZSB(zp)->z_max_blksz); |
| } |
| dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); |
| } else { |
| newblksz = 0; |
| } |
| |
| error = dmu_tx_assign(tx, TXG_WAIT); |
| if (error) { |
| dmu_tx_abort(tx); |
| zfs_rangelock_exit(lr); |
| return (error); |
| } |
| |
| if (newblksz) |
| zfs_grow_blocksize(zp, newblksz, tx); |
| |
| zp->z_size = end; |
| |
| VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(ZTOZSB(zp)), |
| &zp->z_size, sizeof (zp->z_size), tx)); |
| |
| zfs_rangelock_exit(lr); |
| |
| dmu_tx_commit(tx); |
| |
| return (0); |
| } |
| |
| /* |
| * zfs_zero_partial_page - Modeled after update_pages() but |
| * with different arguments and semantics for use by zfs_freesp(). |
| * |
| * Zeroes a piece of a single page cache entry for zp at offset |
| * start and length len. |
| * |
| * Caller must acquire a range lock on the file for the region |
| * being zeroed in order that the ARC and page cache stay in sync. |
| */ |
| static void |
| zfs_zero_partial_page(znode_t *zp, uint64_t start, uint64_t len) |
| { |
| struct address_space *mp = ZTOI(zp)->i_mapping; |
| struct page *pp; |
| int64_t off; |
| void *pb; |
| |
| ASSERT((start & PAGE_MASK) == ((start + len - 1) & PAGE_MASK)); |
| |
| off = start & (PAGE_SIZE - 1); |
| start &= PAGE_MASK; |
| |
| pp = find_lock_page(mp, start >> PAGE_SHIFT); |
| if (pp) { |
| if (mapping_writably_mapped(mp)) |
| flush_dcache_page(pp); |
| |
| pb = kmap(pp); |
| bzero(pb + off, len); |
| kunmap(pp); |
| |
| if (mapping_writably_mapped(mp)) |
| flush_dcache_page(pp); |
| |
| mark_page_accessed(pp); |
| SetPageUptodate(pp); |
| ClearPageError(pp); |
| unlock_page(pp); |
| put_page(pp); |
| } |
| } |
| |
| /* |
| * 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 on success, error code on failure |
| */ |
| static int |
| zfs_free_range(znode_t *zp, uint64_t off, uint64_t len) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| zfs_locked_range_t *lr; |
| int error; |
| |
| /* |
| * Lock the range being freed. |
| */ |
| lr = zfs_rangelock_enter(&zp->z_rangelock, off, len, RL_WRITER); |
| |
| /* |
| * Nothing to do if file already at desired length. |
| */ |
| if (off >= zp->z_size) { |
| zfs_rangelock_exit(lr); |
| return (0); |
| } |
| |
| if (off + len > zp->z_size) |
| len = zp->z_size - off; |
| |
| error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len); |
| |
| /* |
| * Zero partial page cache entries. This must be done under a |
| * range lock in order to keep the ARC and page cache in sync. |
| */ |
| if (zp->z_is_mapped) { |
| loff_t first_page, last_page, page_len; |
| loff_t first_page_offset, last_page_offset; |
| |
| /* first possible full page in hole */ |
| first_page = (off + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| /* last page of hole */ |
| last_page = (off + len) >> PAGE_SHIFT; |
| |
| /* offset of first_page */ |
| first_page_offset = first_page << PAGE_SHIFT; |
| /* offset of last_page */ |
| last_page_offset = last_page << PAGE_SHIFT; |
| |
| /* truncate whole pages */ |
| if (last_page_offset > first_page_offset) { |
| truncate_inode_pages_range(ZTOI(zp)->i_mapping, |
| first_page_offset, last_page_offset - 1); |
| } |
| |
| /* truncate sub-page ranges */ |
| if (first_page > last_page) { |
| /* entire punched area within a single page */ |
| zfs_zero_partial_page(zp, off, len); |
| } else { |
| /* beginning of punched area at the end of a page */ |
| page_len = first_page_offset - off; |
| if (page_len > 0) |
| zfs_zero_partial_page(zp, off, page_len); |
| |
| /* end of punched area at the beginning of a page */ |
| page_len = off + len - last_page_offset; |
| if (page_len > 0) |
| zfs_zero_partial_page(zp, last_page_offset, |
| page_len); |
| } |
| } |
| zfs_rangelock_exit(lr); |
| |
| return (error); |
| } |
| |
| /* |
| * Truncate a file |
| * |
| * IN: zp - znode of file to free data in. |
| * end - new end-of-file. |
| * |
| * RETURN: 0 on success, error code on failure |
| */ |
| static int |
| zfs_trunc(znode_t *zp, uint64_t end) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| dmu_tx_t *tx; |
| zfs_locked_range_t *lr; |
| int error; |
| sa_bulk_attr_t bulk[2]; |
| int count = 0; |
| |
| /* |
| * We will change zp_size, lock the whole file. |
| */ |
| lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER); |
| |
| /* |
| * Nothing to do if file already at desired length. |
| */ |
| if (end >= zp->z_size) { |
| zfs_rangelock_exit(lr); |
| return (0); |
| } |
| |
| error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, |
| DMU_OBJECT_END); |
| if (error) { |
| zfs_rangelock_exit(lr); |
| return (error); |
| } |
| tx = dmu_tx_create(zfsvfs->z_os); |
| dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); |
| zfs_sa_upgrade_txholds(tx, zp); |
| dmu_tx_mark_netfree(tx); |
| error = dmu_tx_assign(tx, TXG_WAIT); |
| if (error) { |
| dmu_tx_abort(tx); |
| zfs_rangelock_exit(lr); |
| return (error); |
| } |
| |
| zp->z_size = end; |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), |
| NULL, &zp->z_size, sizeof (zp->z_size)); |
| |
| if (end == 0) { |
| zp->z_pflags &= ~ZFS_SPARSE; |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), |
| NULL, &zp->z_pflags, 8); |
| } |
| VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0); |
| |
| dmu_tx_commit(tx); |
| zfs_rangelock_exit(lr); |
| |
| 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 on success, error code on failure |
| */ |
| int |
| zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) |
| { |
| dmu_tx_t *tx; |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| zilog_t *zilog = zfsvfs->z_log; |
| uint64_t mode; |
| uint64_t mtime[2], ctime[2]; |
| sa_bulk_attr_t bulk[3]; |
| int count = 0; |
| int error; |
| |
| if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode, |
| sizeof (mode))) != 0) |
| return (error); |
| |
| if (off > zp->z_size) { |
| error = zfs_extend(zp, off+len); |
| if (error == 0 && log) |
| goto log; |
| goto out; |
| } |
| |
| if (len == 0) { |
| error = zfs_trunc(zp, off); |
| } else { |
| if ((error = zfs_free_range(zp, off, len)) == 0 && |
| off + len > zp->z_size) |
| error = zfs_extend(zp, off+len); |
| } |
| if (error || !log) |
| goto out; |
| log: |
| tx = dmu_tx_create(zfsvfs->z_os); |
| dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); |
| zfs_sa_upgrade_txholds(tx, zp); |
| error = dmu_tx_assign(tx, TXG_WAIT); |
| if (error) { |
| dmu_tx_abort(tx); |
| goto out; |
| } |
| |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), |
| NULL, &zp->z_pflags, 8); |
| zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime); |
| error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); |
| ASSERT(error == 0); |
| |
| zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); |
| |
| dmu_tx_commit(tx); |
| |
| zfs_inode_update(zp); |
| error = 0; |
| |
| out: |
| /* |
| * Truncate the page cache - for file truncate operations, use |
| * the purpose-built API for truncations. For punching operations, |
| * the truncation is handled under a range lock in zfs_free_range. |
| */ |
| if (len == 0) |
| truncate_setsize(ZTOI(zp), off); |
| return (error); |
| } |
| |
| void |
| zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) |
| { |
| struct super_block *sb; |
| zfsvfs_t *zfsvfs; |
| uint64_t moid, obj, sa_obj, version; |
| uint64_t sense = ZFS_CASE_SENSITIVE; |
| uint64_t norm = 0; |
| nvpair_t *elem; |
| int size; |
| int error; |
| int i; |
| znode_t *rootzp = NULL; |
| vattr_t vattr; |
| znode_t *zp; |
| zfs_acl_ids_t acl_ids; |
| |
| /* |
| * 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. |
| */ |
| version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os))); |
| 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) { |
| if (val < version) |
| version = val; |
| } 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); |
| error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx); |
| |
| /* |
| * Create zap object used for SA attribute registration |
| */ |
| |
| if (version >= ZPL_VERSION_SA) { |
| sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, |
| DMU_OT_NONE, 0, tx); |
| error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); |
| ASSERT(error == 0); |
| } else { |
| sa_obj = 0; |
| } |
| /* |
| * Create a delete queue. |
| */ |
| obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); |
| |
| error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx); |
| ASSERT(error == 0); |
| |
| /* |
| * Create root znode. Create minimal znode/inode/zfsvfs/sb |
| * to allow zfs_mknode to work. |
| */ |
| vattr.va_mask = ATTR_MODE|ATTR_UID|ATTR_GID; |
| 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 = B_FALSE; |
| rootzp->z_atime_dirty = B_FALSE; |
| rootzp->z_moved = B_FALSE; |
| rootzp->z_is_sa = USE_SA(version, os); |
| rootzp->z_pflags = 0; |
| |
| zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); |
| zfsvfs->z_os = os; |
| zfsvfs->z_parent = zfsvfs; |
| zfsvfs->z_version = version; |
| zfsvfs->z_use_fuids = USE_FUIDS(version, os); |
| zfsvfs->z_use_sa = USE_SA(version, os); |
| zfsvfs->z_norm = norm; |
| |
| sb = kmem_zalloc(sizeof (struct super_block), KM_SLEEP); |
| sb->s_fs_info = zfsvfs; |
| |
| ZTOI(rootzp)->i_sb = sb; |
| |
| error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, |
| &zfsvfs->z_attr_table); |
| |
| ASSERT(error == 0); |
| |
| /* |
| * 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)); |
| |
| size = MIN(1 << (highbit64(zfs_object_mutex_size)-1), ZFS_OBJ_MTX_MAX); |
| zfsvfs->z_hold_size = size; |
| zfsvfs->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size, |
| KM_SLEEP); |
| zfsvfs->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP); |
| for (i = 0; i != size; i++) { |
| avl_create(&zfsvfs->z_hold_trees[i], zfs_znode_hold_compare, |
| sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node)); |
| mutex_init(&zfsvfs->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL); |
| } |
| |
| VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr, |
| cr, NULL, &acl_ids)); |
| zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids); |
| ASSERT3P(zp, ==, rootzp); |
| error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); |
| ASSERT(error == 0); |
| zfs_acl_ids_free(&acl_ids); |
| |
| atomic_set(&ZTOI(rootzp)->i_count, 0); |
| sa_handle_destroy(rootzp->z_sa_hdl); |
| kmem_cache_free(znode_cache, rootzp); |
| |
| for (i = 0; i != size; i++) { |
| avl_destroy(&zfsvfs->z_hold_trees[i]); |
| mutex_destroy(&zfsvfs->z_hold_locks[i]); |
| } |
| |
| mutex_destroy(&zfsvfs->z_znodes_lock); |
| |
| vmem_free(zfsvfs->z_hold_trees, sizeof (avl_tree_t) * size); |
| vmem_free(zfsvfs->z_hold_locks, sizeof (kmutex_t) * size); |
| kmem_free(sb, sizeof (struct super_block)); |
| kmem_free(zfsvfs, sizeof (zfsvfs_t)); |
| } |
| #endif /* _KERNEL */ |
| |
| static int |
| zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table) |
| { |
| uint64_t sa_obj = 0; |
| int error; |
| |
| error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj); |
| if (error != 0 && error != ENOENT) |
| return (error); |
| |
| error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table); |
| return (error); |
| } |
| |
| static int |
| zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp, |
| dmu_buf_t **db, void *tag) |
| { |
| dmu_object_info_t doi; |
| int error; |
| |
| if ((error = sa_buf_hold(osp, obj, tag, db)) != 0) |
| return (error); |
| |
| dmu_object_info_from_db(*db, &doi); |
| if ((doi.doi_bonus_type != DMU_OT_SA && |
| doi.doi_bonus_type != DMU_OT_ZNODE) || |
| (doi.doi_bonus_type == DMU_OT_ZNODE && |
| doi.doi_bonus_size < sizeof (znode_phys_t))) { |
| sa_buf_rele(*db, tag); |
| return (SET_ERROR(ENOTSUP)); |
| } |
| |
| error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp); |
| if (error != 0) { |
| sa_buf_rele(*db, tag); |
| return (error); |
| } |
| |
| return (0); |
| } |
| |
| void |
| zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag) |
| { |
| sa_handle_destroy(hdl); |
| sa_buf_rele(db, tag); |
| } |
| |
| /* |
| * 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, sa_handle_t *hdl, sa_attr_type_t *sa_table, |
| uint64_t *pobjp, int *is_xattrdir) |
| { |
| uint64_t parent; |
| uint64_t pflags; |
| uint64_t mode; |
| uint64_t parent_mode; |
| sa_bulk_attr_t bulk[3]; |
| sa_handle_t *sa_hdl; |
| dmu_buf_t *sa_db; |
| int count = 0; |
| int error; |
| |
| SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL, |
| &parent, sizeof (parent)); |
| SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL, |
| &pflags, sizeof (pflags)); |
| SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, |
| &mode, sizeof (mode)); |
| |
| if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0) |
| return (error); |
| |
| /* |
| * When a link is removed its parent pointer is not changed and will |
| * be invalid. There are two cases where a link is removed but the |
| * file stays around, when it goes to the delete queue and when there |
| * are additional links. |
| */ |
| error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG); |
| if (error != 0) |
| return (error); |
| |
| error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode)); |
| zfs_release_sa_handle(sa_hdl, sa_db, FTAG); |
| if (error != 0) |
| return (error); |
| |
| *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode); |
| |
| /* |
| * Extended attributes can be applied to files, directories, etc. |
| * Otherwise the parent must be a directory. |
| */ |
| if (!*is_xattrdir && !S_ISDIR(parent_mode)) |
| return (SET_ERROR(EINVAL)); |
| |
| *pobjp = parent; |
| |
| return (0); |
| } |
| |
| /* |
| * Given an object number, return some zpl level statistics |
| */ |
| static int |
| zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table, |
| zfs_stat_t *sb) |
| { |
| sa_bulk_attr_t bulk[4]; |
| int count = 0; |
| |
| SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, |
| &sb->zs_mode, sizeof (sb->zs_mode)); |
| SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL, |
| &sb->zs_gen, sizeof (sb->zs_gen)); |
| SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL, |
| &sb->zs_links, sizeof (sb->zs_links)); |
| SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL, |
| &sb->zs_ctime, sizeof (sb->zs_ctime)); |
| |
| return (sa_bulk_lookup(hdl, bulk, count)); |
| } |
| |
| static int |
| zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl, |
| sa_attr_type_t *sa_table, char *buf, int len) |
| { |
| sa_handle_t *sa_hdl; |
| sa_handle_t *prevhdl = NULL; |
| dmu_buf_t *prevdb = NULL; |
| dmu_buf_t *sa_db = NULL; |
| char *path = buf + len - 1; |
| int error; |
| |
| *path = '\0'; |
| sa_hdl = hdl; |
| |
| uint64_t deleteq_obj; |
| VERIFY0(zap_lookup(osp, MASTER_NODE_OBJ, |
| ZFS_UNLINKED_SET, sizeof (uint64_t), 1, &deleteq_obj)); |
| error = zap_lookup_int(osp, deleteq_obj, obj); |
| if (error == 0) { |
| return (ESTALE); |
| } else if (error != ENOENT) { |
| return (error); |
| } |
| error = 0; |
| |
| for (;;) { |
| uint64_t pobj = 0; |
| char component[MAXNAMELEN + 2]; |
| size_t complen; |
| int is_xattrdir = 0; |
| |
| if (prevdb) |
| zfs_release_sa_handle(prevhdl, prevdb, FTAG); |
| |
| if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &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 (sa_hdl != hdl) { |
| prevhdl = sa_hdl; |
| prevdb = sa_db; |
| } |
| error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG); |
| if (error != 0) { |
| sa_hdl = prevhdl; |
| sa_db = prevdb; |
| break; |
| } |
| } |
| |
| if (sa_hdl != NULL && sa_hdl != hdl) { |
| ASSERT(sa_db != NULL); |
| zfs_release_sa_handle(sa_hdl, sa_db, FTAG); |
| } |
| |
| if (error == 0) |
| (void) memmove(buf, path, buf + len - path); |
| |
| return (error); |
| } |
| |
| int |
| zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) |
| { |
| sa_attr_type_t *sa_table; |
| sa_handle_t *hdl; |
| dmu_buf_t *db; |
| int error; |
| |
| error = zfs_sa_setup(osp, &sa_table); |
| if (error != 0) |
| return (error); |
| |
| error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); |
| if (error != 0) |
| return (error); |
| |
| error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); |
| |
| zfs_release_sa_handle(hdl, db, FTAG); |
| return (error); |
| } |
| |
| int |
| zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb, |
| char *buf, int len) |
| { |
| char *path = buf + len - 1; |
| sa_attr_type_t *sa_table; |
| sa_handle_t *hdl; |
| dmu_buf_t *db; |
| int error; |
| |
| *path = '\0'; |
| |
| error = zfs_sa_setup(osp, &sa_table); |
| if (error != 0) |
| return (error); |
| |
| error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); |
| if (error != 0) |
| return (error); |
| |
| error = zfs_obj_to_stats_impl(hdl, sa_table, sb); |
| if (error != 0) { |
| zfs_release_sa_handle(hdl, db, FTAG); |
| return (error); |
| } |
| |
| error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); |
| |
| zfs_release_sa_handle(hdl, db, FTAG); |
| return (error); |
| } |
| |
| #if defined(_KERNEL) |
| EXPORT_SYMBOL(zfs_create_fs); |
| EXPORT_SYMBOL(zfs_obj_to_path); |
| |
| /* CSTYLED */ |
| module_param(zfs_object_mutex_size, uint, 0644); |
| MODULE_PARM_DESC(zfs_object_mutex_size, "Size of znode hold array"); |
| module_param(zfs_unlink_suspend_progress, int, 0644); |
| MODULE_PARM_DESC(zfs_unlink_suspend_progress, "Set to prevent async unlinks " |
| "(debug - leaks space into the unlinked set)"); |
| #endif |