author | ek110237 |
Wed, 24 Oct 2007 16:54:46 -0700 | |
changeset 5326 | 6752aa2bd5bc |
parent 4820 | acbb57436af2 |
child 5331 | 3047ad28a67b |
permissions | -rw-r--r-- |
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/* |
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* CDDL HEADER START |
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* |
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* The contents of this file are subject to the terms of the |
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* Common Development and Distribution License (the "License"). |
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* You may not use this file except in compliance with the License. |
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* |
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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* or http://www.opensolaris.org/os/licensing. |
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* See the License for the specific language governing permissions |
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* and limitations under the License. |
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* |
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* When distributing Covered Code, include this CDDL HEADER in each |
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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* If applicable, add the following below this CDDL HEADER, with the |
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* fields enclosed by brackets "[]" replaced with your own identifying |
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* information: Portions Copyright [yyyy] [name of copyright owner] |
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* |
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* CDDL HEADER END |
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*/ |
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/* |
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved. |
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* Use is subject to license terms. |
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*/ |
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#ifndef _SYS_FS_ZFS_VFSOPS_H |
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#define _SYS_FS_ZFS_VFSOPS_H |
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#pragma ident "%Z%%M% %I% %E% SMI" |
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#include <sys/isa_defs.h> |
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#include <sys/types32.h> |
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#include <sys/list.h> |
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#include <sys/vfs.h> |
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#include <sys/zil.h> |
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#include <sys/rrwlock.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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typedef struct zfsvfs zfsvfs_t; |
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struct zfsvfs { |
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vfs_t *z_vfs; /* generic fs struct */ |
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zfsvfs_t *z_parent; /* parent fs */ |
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objset_t *z_os; /* objset reference */ |
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uint64_t z_root; /* id of root znode */ |
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uint64_t z_unlinkedobj; /* id of unlinked zapobj */ |
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uint64_t z_max_blksz; /* maximum block size for files */ |
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uint64_t z_assign; /* TXG_NOWAIT or set by zil_replay() */ |
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zilog_t *z_log; /* intent log pointer */ |
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uint_t z_acl_mode; /* acl chmod/mode behavior */ |
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uint_t z_acl_inherit; /* acl inheritance behavior */ |
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boolean_t z_atime; /* enable atimes mount option */ |
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boolean_t z_unmounted; /* unmounted */ |
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rrwlock_t z_teardown_lock; |
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krwlock_t z_teardown_inactive_lock; |
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list_t z_all_znodes; /* all vnodes in the fs */ |
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kmutex_t z_znodes_lock; /* lock for z_all_znodes */ |
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vnode_t *z_ctldir; /* .zfs directory pointer */ |
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boolean_t z_show_ctldir; /* expose .zfs in the root dir */ |
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boolean_t z_issnap; /* true if this is a snapshot */ |
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uint64_t z_version; |
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#define ZFS_OBJ_MTX_SZ 64 |
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kmutex_t z_hold_mtx[ZFS_OBJ_MTX_SZ]; /* znode hold locks */ |
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}; |
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/* |
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* Normal filesystems (those not under .zfs/snapshot) have a total |
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* file ID size limited to 12 bytes (including the length field) due to |
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* NFSv2 protocol's limitation of 32 bytes for a filehandle. For historical |
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* reasons, this same limit is being imposed by the Solaris NFSv3 implementation |
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* (although the NFSv3 protocol actually permits a maximum of 64 bytes). It |
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* is not possible to expand beyond 12 bytes without abandoning support |
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* of NFSv2. |
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* |
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* For normal filesystems, we partition up the available space as follows: |
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* 2 bytes fid length (required) |
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* 6 bytes object number (48 bits) |
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* 4 bytes generation number (32 bits) |
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* |
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* We reserve only 48 bits for the object number, as this is the limit |
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* currently defined and imposed by the DMU. |
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*/ |
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typedef struct zfid_short { |
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uint16_t zf_len; |
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uint8_t zf_object[6]; /* obj[i] = obj >> (8 * i) */ |
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uint8_t zf_gen[4]; /* gen[i] = gen >> (8 * i) */ |
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} zfid_short_t; |
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/* |
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* Filesystems under .zfs/snapshot have a total file ID size of 22 bytes |
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* (including the length field). This makes files under .zfs/snapshot |
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* accessible by NFSv3 and NFSv4, but not NFSv2. |
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* |
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* For files under .zfs/snapshot, we partition up the available space |
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* as follows: |
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* 2 bytes fid length (required) |
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* 6 bytes object number (48 bits) |
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* 4 bytes generation number (32 bits) |
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* 6 bytes objset id (48 bits) |
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* 4 bytes currently just zero (32 bits) |
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* |
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* We reserve only 48 bits for the object number and objset id, as these are |
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* the limits currently defined and imposed by the DMU. |
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*/ |
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typedef struct zfid_long { |
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zfid_short_t z_fid; |
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uint8_t zf_setid[6]; /* obj[i] = obj >> (8 * i) */ |
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uint8_t zf_setgen[4]; /* gen[i] = gen >> (8 * i) */ |
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} zfid_long_t; |
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#define SHORT_FID_LEN (sizeof (zfid_short_t) - sizeof (uint16_t)) |
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#define LONG_FID_LEN (sizeof (zfid_long_t) - sizeof (uint16_t)) |
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extern uint_t zfs_fsyncer_key; |
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extern int zfs_suspend_fs(zfsvfs_t *zfsvfs, char *osname, int *mode); |
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extern int zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname, int mode); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _SYS_FS_ZFS_VFSOPS_H */ |