/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #ifndef _SYS_FS_ZFS_ZNODE_H #define _SYS_FS_ZFS_ZNODE_H #pragma ident "%Z%%M% %I% %E% SMI" #ifdef _KERNEL #include #include #include #include #include #endif #include #include #ifdef __cplusplus extern "C" { #endif /* * Define special zfs pflags */ #define ZFS_XATTR 0x1 /* is an extended attribute */ #define ZFS_INHERIT_ACE 0x2 /* ace has inheritable ACEs */ #define ZFS_ACL_TRIVIAL 0x4 /* files ACL is trivial */ #define MASTER_NODE_OBJ 1 /* * special attributes for master node. */ #define ZFS_FSID "FSID" #define ZFS_UNLINKED_SET "DELETE_QUEUE" #define ZFS_ROOT_OBJ "ROOT" #define ZPL_VERSION_OBJ "VERSION" #define ZFS_PROP_BLOCKPERPAGE "BLOCKPERPAGE" #define ZFS_PROP_NOGROWBLOCKS "NOGROWBLOCKS" #define ZFS_FLAG_BLOCKPERPAGE 0x1 #define ZFS_FLAG_NOGROWBLOCKS 0x2 /* * ZPL version - rev'd whenever an incompatible on-disk format change * occurs. Independent of SPA/DMU/ZAP versioning. */ #define ZPL_VERSION 1ULL #define ZFS_MAX_BLOCKSIZE (SPA_MAXBLOCKSIZE) /* Path component length */ /* * The generic fs code uses MAXNAMELEN to represent * what the largest component length is. Unfortunately, * this length includes the terminating NULL. ZFS needs * to tell the users via pathconf() and statvfs() what the * true maximum length of a component is, excluding the NULL. */ #define ZFS_MAXNAMELEN (MAXNAMELEN - 1) /* * This is the persistent portion of the znode. It is stored * in the "bonus buffer" of the file. Short symbolic links * are also stored in the bonus buffer. */ typedef struct znode_phys { uint64_t zp_atime[2]; /* 0 - last file access time */ uint64_t zp_mtime[2]; /* 16 - last file modification time */ uint64_t zp_ctime[2]; /* 32 - last file change time */ uint64_t zp_crtime[2]; /* 48 - creation time */ uint64_t zp_gen; /* 64 - generation (txg of creation) */ uint64_t zp_mode; /* 72 - file mode bits */ uint64_t zp_size; /* 80 - size of file */ uint64_t zp_parent; /* 88 - directory parent (`..') */ uint64_t zp_links; /* 96 - number of links to file */ uint64_t zp_xattr; /* 104 - DMU object for xattrs */ uint64_t zp_rdev; /* 112 - dev_t for VBLK & VCHR files */ uint64_t zp_flags; /* 120 - persistent flags */ uint64_t zp_uid; /* 128 - file owner */ uint64_t zp_gid; /* 136 - owning group */ uint64_t zp_pad[4]; /* 144 - future */ zfs_znode_acl_t zp_acl; /* 176 - 263 ACL */ /* * Data may pad out any remaining bytes in the znode buffer, eg: * * |<---------------------- dnode_phys (512) ------------------------>| * |<-- dnode (192) --->|<----------- "bonus" buffer (320) ---------->| * |<---- znode (264) ---->|<---- data (56) ---->| * * At present, we only use this space to store symbolic links. */ } znode_phys_t; /* * Directory entry locks control access to directory entries. * They are used to protect creates, deletes, and renames. * Each directory znode has a mutex and a list of locked names. */ #ifdef _KERNEL typedef struct zfs_dirlock { char *dl_name; /* directory entry being locked */ uint32_t dl_sharecnt; /* 0 if exclusive, > 0 if shared */ uint16_t dl_namesize; /* set if dl_name was allocated */ kcondvar_t dl_cv; /* wait for entry to be unlocked */ struct znode *dl_dzp; /* directory znode */ struct zfs_dirlock *dl_next; /* next in z_dirlocks list */ } zfs_dirlock_t; typedef struct znode { struct zfsvfs *z_zfsvfs; vnode_t *z_vnode; uint64_t z_id; /* object ID for this znode */ kmutex_t z_lock; /* znode modification lock */ krwlock_t z_map_lock; /* page map lock */ krwlock_t z_parent_lock; /* parent lock for directories */ zfs_dirlock_t *z_dirlocks; /* directory entry lock list */ kmutex_t z_range_lock; /* protects changes to z_range_avl */ avl_tree_t z_range_avl; /* avl tree of file range locks */ uint8_t z_unlinked; /* file has been unlinked */ uint8_t z_atime_dirty; /* atime needs to be synced */ uint8_t z_dbuf_held; /* Is z_dbuf already held? */ uint8_t z_zn_prefetch; /* Prefetch znodes? */ uint_t z_blksz; /* block size in bytes */ uint_t z_seq; /* modification sequence number */ uint64_t z_mapcnt; /* number of pages mapped to file */ uint64_t z_last_itx; /* last ZIL itx on this znode */ uint32_t z_sync_cnt; /* synchronous open count */ kmutex_t z_acl_lock; /* acl data lock */ list_node_t z_link_node; /* all znodes in fs link */ /* * These are dmu managed fields. */ znode_phys_t *z_phys; /* pointer to persistent znode */ dmu_buf_t *z_dbuf; /* buffer containing the z_phys */ } znode_t; /* * Range locking rules * -------------------- * 1. When truncating a file (zfs_create, zfs_setattr, zfs_space) the whole * file range needs to be locked as RL_WRITER. Only then can the pages be * freed etc and zp_size reset. zp_size must be set within range lock. * 2. For writes and punching holes (zfs_write & zfs_space) just the range * being written or freed needs to be locked as RL_WRITER. * Multiple writes at the end of the file must coordinate zp_size updates * to ensure data isn't lost. A compare and swap loop is currently used * to ensure the file size is at least the offset last written. * 3. For reads (zfs_read, zfs_get_data & zfs_putapage) just the range being * read needs to be locked as RL_READER. A check against zp_size can then * be made for reading beyond end of file. */ /* * Convert between znode pointers and vnode pointers */ #define ZTOV(ZP) ((ZP)->z_vnode) #define VTOZ(VP) ((znode_t *)(VP)->v_data) /* * ZFS_ENTER() is called on entry to each ZFS vnode and vfs operation. * ZFS_EXIT() must be called before exitting the vop. */ #define ZFS_ENTER(zfsvfs) \ { \ atomic_add_32(&(zfsvfs)->z_op_cnt, 1); \ if ((zfsvfs)->z_unmounted1) { \ ZFS_EXIT(zfsvfs); \ return (EIO); \ } \ } #define ZFS_EXIT(zfsvfs) atomic_add_32(&(zfsvfs)->z_op_cnt, -1) /* * Macros for dealing with dmu_buf_hold */ #define ZFS_OBJ_HASH(obj_num) (obj_num & (ZFS_OBJ_MTX_SZ - 1)) #define ZFS_OBJ_MUTEX(zp) \ (&zp->z_zfsvfs->z_hold_mtx[ZFS_OBJ_HASH(zp->z_id)]) #define ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num) \ mutex_enter(&zfsvfs->z_hold_mtx[ZFS_OBJ_HASH(obj_num)]); #define ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num) \ mutex_exit(&zfsvfs->z_hold_mtx[ZFS_OBJ_HASH(obj_num)]) /* * Macros to encode/decode ZFS stored time values from/to struct timespec */ #define ZFS_TIME_ENCODE(tp, stmp) \ { \ stmp[0] = (uint64_t)(tp)->tv_sec; \ stmp[1] = (uint64_t)(tp)->tv_nsec; \ } #define ZFS_TIME_DECODE(tp, stmp) \ { \ (tp)->tv_sec = (time_t)stmp[0]; \ (tp)->tv_nsec = (long)stmp[1]; \ } /* * Timestamp defines */ #define ACCESSED (AT_ATIME) #define STATE_CHANGED (AT_CTIME) #define CONTENT_MODIFIED (AT_MTIME | AT_CTIME) #define ZFS_ACCESSTIME_STAMP(zfsvfs, zp) \ if ((zfsvfs)->z_atime && !((zfsvfs)->z_vfs->vfs_flag & VFS_RDONLY)) \ zfs_time_stamper(zp, ACCESSED, NULL) extern int zfs_init_fs(zfsvfs_t *, znode_t **, cred_t *); extern void zfs_set_dataprop(objset_t *); extern void zfs_create_fs(objset_t *os, cred_t *cr, dmu_tx_t *tx); extern void zfs_time_stamper(znode_t *, uint_t, dmu_tx_t *); extern void zfs_time_stamper_locked(znode_t *, uint_t, dmu_tx_t *); extern void zfs_grow_blocksize(znode_t *, uint64_t, dmu_tx_t *); extern int zfs_freesp(znode_t *, uint64_t, uint64_t, int, boolean_t); extern void zfs_znode_init(void); extern void zfs_znode_fini(void); extern int zfs_zget(zfsvfs_t *, uint64_t, znode_t **); extern void zfs_zinactive(znode_t *); extern void zfs_znode_delete(znode_t *, dmu_tx_t *); extern void zfs_znode_free(znode_t *); extern void zfs_remove_op_tables(); extern int zfs_create_op_tables(); extern int zfs_sync(vfs_t *vfsp, short flag, cred_t *cr); extern dev_t zfs_cmpldev(uint64_t); extern void zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *dzp, znode_t *zp, char *name); extern void zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *dzp, char *name); extern void zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *dzp, znode_t *zp, char *name); extern void zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *dzp, znode_t *zp, char *name, char *link); extern void zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *sdzp, char *sname, znode_t *tdzp, char *dname, znode_t *szp); extern void zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *zp, offset_t off, ssize_t len, int ioflag, uio_t *uio); extern void zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *zp, uint64_t off, uint64_t len); extern void zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *zp, vattr_t *vap, uint_t mask_applied); extern void zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *zp, int aclcnt, ace_t *z_ace); extern zil_get_data_t zfs_get_data; extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE]; extern int zfsfstype; #endif /* _KERNEL */ extern int zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len); #ifdef __cplusplus } #endif #endif /* _SYS_FS_ZFS_ZNODE_H */