author | eschrock |
Mon, 30 Jan 2006 21:34:28 -0800 | |
changeset 1354 | 81359ee1ee63 |
parent 1308 | 997e6a49c409 |
child 1394 | e8d500b79ced |
permissions | -rw-r--r-- |
789 | 1 |
/* |
2 |
* 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, Version 1.0 only |
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* (the "License"). You may not use this file except in compliance |
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* 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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1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved. |
789 | 24 |
* Use is subject to license terms. |
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*/ |
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||
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#pragma ident "%Z%%M% %I% %E% SMI" |
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||
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#include <sys/types.h> |
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#include <sys/param.h> |
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#include <sys/time.h> |
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#include <sys/systm.h> |
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#include <sys/sysmacros.h> |
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#include <sys/resource.h> |
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#include <sys/vfs.h> |
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#include <sys/vnode.h> |
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#include <sys/file.h> |
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#include <sys/stat.h> |
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#include <sys/kmem.h> |
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#include <sys/taskq.h> |
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#include <sys/uio.h> |
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#include <sys/vmsystm.h> |
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#include <sys/atomic.h> |
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#include <vm/seg_vn.h> |
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#include <vm/pvn.h> |
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#include <vm/as.h> |
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#include <sys/mman.h> |
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#include <sys/pathname.h> |
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#include <sys/cmn_err.h> |
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#include <sys/errno.h> |
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#include <sys/unistd.h> |
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#include <sys/zfs_vfsops.h> |
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#include <sys/zfs_dir.h> |
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54 |
#include <sys/zfs_acl.h> |
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55 |
#include <sys/zfs_ioctl.h> |
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56 |
#include <sys/fs/zfs.h> |
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57 |
#include <sys/dmu.h> |
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58 |
#include <sys/spa.h> |
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59 |
#include <sys/txg.h> |
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60 |
#include <sys/refcount.h> /* temporary for debugging purposes */ |
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#include <sys/dbuf.h> |
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#include <sys/zap.h> |
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#include <sys/dirent.h> |
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#include <sys/policy.h> |
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#include <sys/sunddi.h> |
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#include <sys/filio.h> |
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#include "fs/fs_subr.h" |
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#include <sys/zfs_ctldir.h> |
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||
70 |
/* |
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71 |
* Programming rules. |
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72 |
* |
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73 |
* Each vnode op performs some logical unit of work. To do this, the ZPL must |
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* properly lock its in-core state, create a DMU transaction, do the work, |
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* record this work in the intent log (ZIL), commit the DMU transaction, |
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* and wait the the intent log to commit if it's is a synchronous operation. |
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* Morover, the vnode ops must work in both normal and log replay context. |
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* The ordering of events is important to avoid deadlocks and references |
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* to freed memory. The example below illustrates the following Big Rules: |
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80 |
* |
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81 |
* (1) A check must be made in each zfs thread for a mounted file system. |
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* This is done avoiding races using ZFS_ENTER(zfsvfs). |
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* A ZFS_EXIT(zfsvfs) is needed before all returns. |
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* |
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* (2) VN_RELE() should always be the last thing except for zil_commit() |
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* and ZFS_EXIT(). This is for 3 reasons: |
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* First, if it's the last reference, the vnode/znode |
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* can be freed, so the zp may point to freed memory. Second, the last |
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89 |
* reference will call zfs_zinactive(), which may induce a lot of work -- |
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90 |
* pushing cached pages (which requires z_grow_lock) and syncing out |
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* cached atime changes. Third, zfs_zinactive() may require a new tx, |
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* which could deadlock the system if you were already holding one. |
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93 |
* |
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* (3) Always pass zfsvfs->z_assign as the second argument to dmu_tx_assign(). |
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* In normal operation, this will be TXG_NOWAIT. During ZIL replay, |
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* it will be a specific txg. Either way, dmu_tx_assign() never blocks. |
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* This is critical because we don't want to block while holding locks. |
|
98 |
* Note, in particular, that if a lock is sometimes acquired before |
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* the tx assigns, and sometimes after (e.g. z_lock), then failing to |
|
100 |
* use a non-blocking assign can deadlock the system. The scenario: |
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101 |
* |
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102 |
* Thread A has grabbed a lock before calling dmu_tx_assign(). |
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103 |
* Thread B is in an already-assigned tx, and blocks for this lock. |
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104 |
* Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open() |
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105 |
* forever, because the previous txg can't quiesce until B's tx commits. |
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106 |
* |
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107 |
* If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT, |
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108 |
* then drop all locks, call txg_wait_open(), and try again. |
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109 |
* |
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110 |
* (4) If the operation succeeded, generate the intent log entry for it |
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111 |
* before dropping locks. This ensures that the ordering of events |
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* in the intent log matches the order in which they actually occurred. |
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113 |
* |
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114 |
* (5) At the end of each vnode op, the DMU tx must always commit, |
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115 |
* regardless of whether there were any errors. |
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116 |
* |
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117 |
* (6) After dropping all locks, invoke zil_commit(zilog, seq, ioflag) |
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118 |
* to ensure that synchronous semantics are provided when necessary. |
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119 |
* |
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120 |
* In general, this is how things should be ordered in each vnode op: |
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121 |
* |
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122 |
* ZFS_ENTER(zfsvfs); // exit if unmounted |
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123 |
* top: |
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124 |
* zfs_dirent_lock(&dl, ...) // lock directory entry (may VN_HOLD()) |
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125 |
* rw_enter(...); // grab any other locks you need |
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126 |
* tx = dmu_tx_create(...); // get DMU tx |
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127 |
* dmu_tx_hold_*(); // hold each object you might modify |
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128 |
* error = dmu_tx_assign(tx, zfsvfs->z_assign); // try to assign |
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129 |
* if (error) { |
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130 |
* dmu_tx_abort(tx); // abort DMU tx |
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131 |
* rw_exit(...); // drop locks |
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132 |
* zfs_dirent_unlock(dl); // unlock directory entry |
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133 |
* VN_RELE(...); // release held vnodes |
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* if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
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* txg_wait_open(dmu_objset_pool(os), 0); |
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* goto top; |
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137 |
* } |
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138 |
* ZFS_EXIT(zfsvfs); // finished in zfs |
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* return (error); // really out of space |
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140 |
* } |
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* error = do_real_work(); // do whatever this VOP does |
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142 |
* if (error == 0) |
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143 |
* seq = zfs_log_*(...); // on success, make ZIL entry |
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* dmu_tx_commit(tx); // commit DMU tx -- error or not |
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145 |
* rw_exit(...); // drop locks |
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* zfs_dirent_unlock(dl); // unlock directory entry |
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147 |
* VN_RELE(...); // release held vnodes |
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148 |
* zil_commit(zilog, seq, ioflag); // synchronous when necessary |
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149 |
* ZFS_EXIT(zfsvfs); // finished in zfs |
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150 |
* return (error); // done, report error |
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151 |
*/ |
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152 |
||
153 |
/* ARGSUSED */ |
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154 |
static int |
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155 |
zfs_open(vnode_t **vpp, int flag, cred_t *cr) |
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156 |
{ |
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157 |
return (0); |
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158 |
} |
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159 |
||
160 |
/* ARGSUSED */ |
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161 |
static int |
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162 |
zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr) |
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163 |
{ |
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164 |
/* |
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165 |
* Clean up any locks held by this process on the vp. |
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*/ |
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cleanlocks(vp, ddi_get_pid(), 0); |
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cleanshares(vp, ddi_get_pid()); |
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169 |
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170 |
return (0); |
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} |
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172 |
||
173 |
/* |
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174 |
* Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and |
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* data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter. |
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176 |
*/ |
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177 |
static int |
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zfs_holey(vnode_t *vp, int cmd, offset_t *off) |
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179 |
{ |
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180 |
znode_t *zp = VTOZ(vp); |
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uint64_t noff = (uint64_t)*off; /* new offset */ |
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uint64_t file_sz; |
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183 |
int error; |
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184 |
boolean_t hole; |
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185 |
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186 |
rw_enter(&zp->z_grow_lock, RW_READER); |
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file_sz = zp->z_phys->zp_size; |
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if (noff >= file_sz) { |
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rw_exit(&zp->z_grow_lock); |
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return (ENXIO); |
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} |
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193 |
if (cmd == _FIO_SEEK_HOLE) |
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hole = B_TRUE; |
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else |
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hole = B_FALSE; |
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error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff); |
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rw_exit(&zp->z_grow_lock); |
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/* end of file? */ |
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if ((error == ESRCH) || (noff > file_sz)) { |
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/* |
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* Handle the virtual hole at the end of file. |
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*/ |
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if (hole) { |
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*off = file_sz; |
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return (0); |
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} |
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210 |
return (ENXIO); |
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} |
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213 |
if (noff < *off) |
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return (error); |
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*off = noff; |
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216 |
return (error); |
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} |
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||
219 |
/* ARGSUSED */ |
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220 |
static int |
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zfs_ioctl(vnode_t *vp, int com, intptr_t data, int flag, cred_t *cred, |
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int *rvalp) |
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{ |
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offset_t off; |
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int error; |
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zfsvfs_t *zfsvfs; |
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switch (com) { |
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case _FIOFFS: |
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return (zfs_sync(vp->v_vfsp, 0, cred)); |
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232 |
case _FIO_SEEK_DATA: |
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case _FIO_SEEK_HOLE: |
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if (ddi_copyin((void *)data, &off, sizeof (off), flag)) |
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return (EFAULT); |
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236 |
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zfsvfs = VTOZ(vp)->z_zfsvfs; |
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ZFS_ENTER(zfsvfs); |
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239 |
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240 |
/* offset parameter is in/out */ |
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error = zfs_holey(vp, com, &off); |
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ZFS_EXIT(zfsvfs); |
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243 |
if (error) |
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return (error); |
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if (ddi_copyout(&off, (void *)data, sizeof (off), flag)) |
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return (EFAULT); |
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return (0); |
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} |
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return (ENOTTY); |
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} |
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251 |
||
252 |
/* |
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253 |
* When a file is memory mapped, we must keep the IO data synchronized |
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254 |
* between the DMU cache and the memory mapped pages. What this means: |
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255 |
* |
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256 |
* On Write: If we find a memory mapped page, we write to *both* |
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257 |
* the page and the dmu buffer. |
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* |
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259 |
* NOTE: We will always "break up" the IO into PAGESIZE uiomoves when |
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260 |
* the file is memory mapped. |
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*/ |
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262 |
static int |
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263 |
mappedwrite(vnode_t *vp, uint64_t woff, int nbytes, uio_t *uio, dmu_tx_t *tx) |
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{ |
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265 |
znode_t *zp = VTOZ(vp); |
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266 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
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267 |
int64_t start, off; |
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268 |
int len = nbytes; |
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269 |
int error = 0; |
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270 |
||
271 |
start = uio->uio_loffset; |
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272 |
off = start & PAGEOFFSET; |
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273 |
for (start &= PAGEMASK; len > 0; start += PAGESIZE) { |
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274 |
page_t *pp; |
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275 |
uint64_t bytes = MIN(PAGESIZE - off, len); |
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276 |
||
277 |
/* |
|
278 |
* We don't want a new page to "appear" in the middle of |
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279 |
* the file update (because it may not get the write |
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280 |
* update data), so we grab a lock to block |
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281 |
* zfs_getpage(). |
|
282 |
*/ |
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283 |
rw_enter(&zp->z_map_lock, RW_WRITER); |
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284 |
if (pp = page_lookup(vp, start, SE_SHARED)) { |
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285 |
caddr_t va; |
|
286 |
||
287 |
rw_exit(&zp->z_map_lock); |
|
288 |
va = ppmapin(pp, PROT_READ | PROT_WRITE, (caddr_t)-1L); |
|
289 |
error = uiomove(va+off, bytes, UIO_WRITE, uio); |
|
290 |
if (error == 0) { |
|
291 |
dmu_write(zfsvfs->z_os, zp->z_id, |
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292 |
woff, bytes, va+off, tx); |
|
293 |
} |
|
294 |
ppmapout(va); |
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295 |
page_unlock(pp); |
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296 |
} else { |
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297 |
error = dmu_write_uio(zfsvfs->z_os, zp->z_id, |
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298 |
woff, bytes, uio, tx); |
|
299 |
rw_exit(&zp->z_map_lock); |
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300 |
} |
|
301 |
len -= bytes; |
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302 |
woff += bytes; |
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303 |
off = 0; |
|
304 |
if (error) |
|
305 |
break; |
|
306 |
} |
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307 |
return (error); |
|
308 |
} |
|
309 |
||
310 |
/* |
|
311 |
* When a file is memory mapped, we must keep the IO data synchronized |
|
312 |
* between the DMU cache and the memory mapped pages. What this means: |
|
313 |
* |
|
314 |
* On Read: We "read" preferentially from memory mapped pages, |
|
315 |
* else we default from the dmu buffer. |
|
316 |
* |
|
317 |
* NOTE: We will always "break up" the IO into PAGESIZE uiomoves when |
|
318 |
* the file is memory mapped. |
|
319 |
*/ |
|
320 |
static int |
|
321 |
mappedread(vnode_t *vp, char *addr, int nbytes, uio_t *uio) |
|
322 |
{ |
|
323 |
int64_t start, off, bytes; |
|
324 |
int len = nbytes; |
|
325 |
int error = 0; |
|
326 |
||
327 |
start = uio->uio_loffset; |
|
328 |
off = start & PAGEOFFSET; |
|
329 |
for (start &= PAGEMASK; len > 0; start += PAGESIZE) { |
|
330 |
page_t *pp; |
|
331 |
||
332 |
bytes = MIN(PAGESIZE - off, len); |
|
333 |
if (pp = page_lookup(vp, start, SE_SHARED)) { |
|
334 |
caddr_t va; |
|
335 |
||
336 |
va = ppmapin(pp, PROT_READ | PROT_WRITE, (caddr_t)-1L); |
|
337 |
error = uiomove(va + off, bytes, UIO_READ, uio); |
|
338 |
ppmapout(va); |
|
339 |
page_unlock(pp); |
|
340 |
} else { |
|
341 |
/* XXX use dmu_read here? */ |
|
342 |
error = uiomove(addr, bytes, UIO_READ, uio); |
|
343 |
} |
|
344 |
len -= bytes; |
|
345 |
addr += bytes; |
|
346 |
off = 0; |
|
347 |
if (error) |
|
348 |
break; |
|
349 |
} |
|
350 |
return (error); |
|
351 |
} |
|
352 |
||
353 |
uint_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */ |
|
354 |
||
355 |
/* |
|
356 |
* Read bytes from specified file into supplied buffer. |
|
357 |
* |
|
358 |
* IN: vp - vnode of file to be read from. |
|
359 |
* uio - structure supplying read location, range info, |
|
360 |
* and return buffer. |
|
361 |
* ioflag - SYNC flags; used to provide FRSYNC semantics. |
|
362 |
* cr - credentials of caller. |
|
363 |
* |
|
364 |
* OUT: uio - updated offset and range, buffer filled. |
|
365 |
* |
|
366 |
* RETURN: 0 if success |
|
367 |
* error code if failure |
|
368 |
* |
|
369 |
* Side Effects: |
|
370 |
* vp - atime updated if byte count > 0 |
|
371 |
*/ |
|
372 |
/* ARGSUSED */ |
|
373 |
static int |
|
374 |
zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) |
|
375 |
{ |
|
376 |
znode_t *zp = VTOZ(vp); |
|
377 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
378 |
uint64_t delta; |
|
379 |
ssize_t n, size, cnt, ndone; |
|
380 |
int error, i, numbufs; |
|
381 |
dmu_buf_t *dbp, **dbpp; |
|
382 |
||
383 |
ZFS_ENTER(zfsvfs); |
|
384 |
||
385 |
/* |
|
386 |
* Validate file offset |
|
387 |
*/ |
|
388 |
if (uio->uio_loffset < (offset_t)0) { |
|
389 |
ZFS_EXIT(zfsvfs); |
|
390 |
return (EINVAL); |
|
391 |
} |
|
392 |
||
393 |
/* |
|
394 |
* Fasttrack empty reads |
|
395 |
*/ |
|
396 |
if (uio->uio_resid == 0) { |
|
397 |
ZFS_EXIT(zfsvfs); |
|
398 |
return (0); |
|
399 |
} |
|
400 |
||
401 |
/* |
|
402 |
* Check for region locks |
|
403 |
*/ |
|
404 |
if (MANDMODE((mode_t)zp->z_phys->zp_mode)) { |
|
405 |
if (error = chklock(vp, FREAD, |
|
406 |
uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) { |
|
407 |
ZFS_EXIT(zfsvfs); |
|
408 |
return (error); |
|
409 |
} |
|
410 |
} |
|
411 |
||
412 |
/* |
|
413 |
* If we're in FRSYNC mode, sync out this znode before reading it. |
|
414 |
*/ |
|
415 |
zil_commit(zfsvfs->z_log, zp->z_last_itx, ioflag & FRSYNC); |
|
416 |
||
417 |
/* |
|
418 |
* Make sure nobody restructures the file (changes block size) |
|
419 |
* in the middle of the read. |
|
420 |
*/ |
|
421 |
rw_enter(&zp->z_grow_lock, RW_READER); |
|
422 |
/* |
|
423 |
* If we are reading past end-of-file we can skip |
|
424 |
* to the end; but we might still need to set atime. |
|
425 |
*/ |
|
426 |
if (uio->uio_loffset >= zp->z_phys->zp_size) { |
|
427 |
cnt = 0; |
|
428 |
error = 0; |
|
429 |
goto out; |
|
430 |
} |
|
431 |
||
432 |
cnt = MIN(uio->uio_resid, zp->z_phys->zp_size - uio->uio_loffset); |
|
433 |
||
434 |
for (ndone = 0; ndone < cnt; ndone += zfs_read_chunk_size) { |
|
435 |
ASSERT(uio->uio_loffset < zp->z_phys->zp_size); |
|
436 |
n = MIN(zfs_read_chunk_size, |
|
437 |
zp->z_phys->zp_size - uio->uio_loffset); |
|
438 |
n = MIN(n, cnt); |
|
439 |
dbpp = dmu_buf_hold_array(zfsvfs->z_os, zp->z_id, |
|
440 |
uio->uio_loffset, n, &numbufs); |
|
441 |
if (error = dmu_buf_read_array_canfail(dbpp, numbufs)) { |
|
442 |
dmu_buf_rele_array(dbpp, numbufs); |
|
443 |
goto out; |
|
444 |
} |
|
445 |
/* |
|
446 |
* Compute the adjustment to align the dmu buffers |
|
447 |
* with the uio buffer. |
|
448 |
*/ |
|
449 |
delta = uio->uio_loffset - dbpp[0]->db_offset; |
|
450 |
||
451 |
for (i = 0; i < numbufs; i++) { |
|
452 |
if (n < 0) |
|
453 |
break; |
|
454 |
dbp = dbpp[i]; |
|
455 |
size = dbp->db_size - delta; |
|
456 |
/* |
|
457 |
* XXX -- this is correct, but may be suboptimal. |
|
458 |
* If the pages are all clean, we don't need to |
|
459 |
* go through mappedread(). Maybe the VMODSORT |
|
460 |
* stuff can help us here. |
|
461 |
*/ |
|
462 |
if (vn_has_cached_data(vp)) { |
|
463 |
error = mappedread(vp, (caddr_t)dbp->db_data + |
|
464 |
delta, (n < size ? n : size), uio); |
|
465 |
} else { |
|
466 |
error = uiomove((caddr_t)dbp->db_data + delta, |
|
467 |
(n < size ? n : size), UIO_READ, uio); |
|
468 |
} |
|
469 |
if (error) { |
|
470 |
dmu_buf_rele_array(dbpp, numbufs); |
|
471 |
goto out; |
|
472 |
} |
|
473 |
n -= dbp->db_size; |
|
474 |
if (delta) { |
|
475 |
n += delta; |
|
476 |
delta = 0; |
|
477 |
} |
|
478 |
} |
|
479 |
dmu_buf_rele_array(dbpp, numbufs); |
|
480 |
} |
|
481 |
out: |
|
482 |
rw_exit(&zp->z_grow_lock); |
|
483 |
||
484 |
ZFS_ACCESSTIME_STAMP(zfsvfs, zp); |
|
485 |
ZFS_EXIT(zfsvfs); |
|
486 |
return (error); |
|
487 |
} |
|
488 |
||
489 |
/* |
|
490 |
* Fault in the pages of the first n bytes specified by the uio structure. |
|
491 |
* 1 byte in each page is touched and the uio struct is unmodified. |
|
492 |
* Any error will exit this routine as this is only a best |
|
493 |
* attempt to get the pages resident. This is a copy of ufs_trans_touch(). |
|
494 |
*/ |
|
495 |
static void |
|
496 |
zfs_prefault_write(ssize_t n, struct uio *uio) |
|
497 |
{ |
|
498 |
struct iovec *iov; |
|
499 |
ulong_t cnt, incr; |
|
500 |
caddr_t p; |
|
501 |
uint8_t tmp; |
|
502 |
||
503 |
iov = uio->uio_iov; |
|
504 |
||
505 |
while (n) { |
|
506 |
cnt = MIN(iov->iov_len, n); |
|
507 |
if (cnt == 0) { |
|
508 |
/* empty iov entry */ |
|
509 |
iov++; |
|
510 |
continue; |
|
511 |
} |
|
512 |
n -= cnt; |
|
513 |
/* |
|
514 |
* touch each page in this segment. |
|
515 |
*/ |
|
516 |
p = iov->iov_base; |
|
517 |
while (cnt) { |
|
518 |
switch (uio->uio_segflg) { |
|
519 |
case UIO_USERSPACE: |
|
520 |
case UIO_USERISPACE: |
|
521 |
if (fuword8(p, &tmp)) |
|
522 |
return; |
|
523 |
break; |
|
524 |
case UIO_SYSSPACE: |
|
525 |
if (kcopy(p, &tmp, 1)) |
|
526 |
return; |
|
527 |
break; |
|
528 |
} |
|
529 |
incr = MIN(cnt, PAGESIZE); |
|
530 |
p += incr; |
|
531 |
cnt -= incr; |
|
532 |
} |
|
533 |
/* |
|
534 |
* touch the last byte in case it straddles a page. |
|
535 |
*/ |
|
536 |
p--; |
|
537 |
switch (uio->uio_segflg) { |
|
538 |
case UIO_USERSPACE: |
|
539 |
case UIO_USERISPACE: |
|
540 |
if (fuword8(p, &tmp)) |
|
541 |
return; |
|
542 |
break; |
|
543 |
case UIO_SYSSPACE: |
|
544 |
if (kcopy(p, &tmp, 1)) |
|
545 |
return; |
|
546 |
break; |
|
547 |
} |
|
548 |
iov++; |
|
549 |
} |
|
550 |
} |
|
551 |
||
552 |
/* |
|
553 |
* Write the bytes to a file. |
|
554 |
* |
|
555 |
* IN: vp - vnode of file to be written to. |
|
556 |
* uio - structure supplying write location, range info, |
|
557 |
* and data buffer. |
|
558 |
* ioflag - FAPPEND flag set if in append mode. |
|
559 |
* cr - credentials of caller. |
|
560 |
* |
|
561 |
* OUT: uio - updated offset and range. |
|
562 |
* |
|
563 |
* RETURN: 0 if success |
|
564 |
* error code if failure |
|
565 |
* |
|
566 |
* Timestamps: |
|
567 |
* vp - ctime|mtime updated if byte count > 0 |
|
568 |
* |
|
569 |
* Note: zfs_write() holds z_append_lock across calls to txg_wait_open(). |
|
570 |
* It has to because of the semantics of FAPPEND. The implication is that |
|
571 |
* we must never grab z_append_lock while in an assigned tx. |
|
572 |
*/ |
|
573 |
/* ARGSUSED */ |
|
574 |
static int |
|
575 |
zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) |
|
576 |
{ |
|
577 |
znode_t *zp = VTOZ(vp); |
|
578 |
rlim64_t limit = uio->uio_llimit; |
|
579 |
ssize_t start_resid = uio->uio_resid; |
|
580 |
ssize_t tx_bytes; |
|
581 |
uint64_t end_size; |
|
582 |
dmu_tx_t *tx; |
|
583 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
584 |
zilog_t *zilog = zfsvfs->z_log; |
|
585 |
uint64_t seq = 0; |
|
586 |
offset_t woff; |
|
587 |
ssize_t n, nbytes; |
|
588 |
int max_blksz = zfsvfs->z_max_blksz; |
|
589 |
int need_append_lock, error; |
|
590 |
krw_t grow_rw = RW_READER; |
|
591 |
||
592 |
if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T) |
|
593 |
limit = MAXOFFSET_T; |
|
594 |
||
595 |
n = start_resid; |
|
596 |
||
597 |
/* |
|
598 |
* Fasttrack empty write |
|
599 |
*/ |
|
600 |
if (n == 0) |
|
601 |
return (0); |
|
602 |
||
603 |
ZFS_ENTER(zfsvfs); |
|
604 |
||
605 |
/* |
|
606 |
* Pre-fault the pages to ensure slow (eg NFS) pages don't hold up txg |
|
607 |
*/ |
|
608 |
zfs_prefault_write(MIN(start_resid, SPA_MAXBLOCKSIZE), uio); |
|
609 |
||
610 |
/* |
|
611 |
* If in append mode, set the io offset pointer to eof. |
|
612 |
*/ |
|
613 |
need_append_lock = ioflag & FAPPEND; |
|
614 |
if (need_append_lock) { |
|
615 |
rw_enter(&zp->z_append_lock, RW_WRITER); |
|
616 |
woff = uio->uio_loffset = zp->z_phys->zp_size; |
|
617 |
} else { |
|
618 |
woff = uio->uio_loffset; |
|
619 |
/* |
|
620 |
* Validate file offset |
|
621 |
*/ |
|
622 |
if (woff < 0) { |
|
623 |
ZFS_EXIT(zfsvfs); |
|
624 |
return (EINVAL); |
|
625 |
} |
|
626 |
||
627 |
/* |
|
628 |
* If this write could change the file length, |
|
629 |
* we need to synchronize with "appenders". |
|
630 |
*/ |
|
631 |
if (woff < limit - n && woff + n > zp->z_phys->zp_size) { |
|
632 |
need_append_lock = TRUE; |
|
633 |
rw_enter(&zp->z_append_lock, RW_READER); |
|
634 |
} |
|
635 |
} |
|
636 |
||
637 |
if (woff >= limit) { |
|
638 |
error = EFBIG; |
|
639 |
goto no_tx_done; |
|
640 |
} |
|
641 |
||
642 |
if ((woff + n) > limit || woff > (limit - n)) |
|
643 |
n = limit - woff; |
|
644 |
||
645 |
/* |
|
646 |
* Check for region locks |
|
647 |
*/ |
|
648 |
if (MANDMODE((mode_t)zp->z_phys->zp_mode) && |
|
649 |
(error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) |
|
650 |
goto no_tx_done; |
|
651 |
top: |
|
652 |
/* |
|
653 |
* Make sure nobody restructures the file (changes block size) |
|
654 |
* in the middle of the write. |
|
655 |
*/ |
|
656 |
rw_enter(&zp->z_grow_lock, grow_rw); |
|
657 |
||
658 |
end_size = MAX(zp->z_phys->zp_size, woff + n); |
|
659 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
660 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
661 |
dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz)); |
|
662 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
663 |
if (error) { |
|
664 |
dmu_tx_abort(tx); |
|
665 |
rw_exit(&zp->z_grow_lock); |
|
666 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
667 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
668 |
goto top; |
|
669 |
} |
|
670 |
goto no_tx_done; |
|
671 |
} |
|
672 |
||
673 |
if (end_size > zp->z_blksz && |
|
674 |
(!ISP2(zp->z_blksz) || zp->z_blksz < max_blksz)) { |
|
675 |
uint64_t new_blksz; |
|
676 |
/* |
|
677 |
* This write will increase the file size beyond |
|
678 |
* the current block size so increase the block size. |
|
679 |
*/ |
|
680 |
if (grow_rw == RW_READER && !rw_tryupgrade(&zp->z_grow_lock)) { |
|
681 |
dmu_tx_commit(tx); |
|
682 |
rw_exit(&zp->z_grow_lock); |
|
683 |
grow_rw = RW_WRITER; |
|
684 |
goto top; |
|
685 |
} |
|
686 |
if (zp->z_blksz > max_blksz) { |
|
687 |
ASSERT(!ISP2(zp->z_blksz)); |
|
688 |
new_blksz = MIN(end_size, SPA_MAXBLOCKSIZE); |
|
689 |
} else { |
|
690 |
new_blksz = MIN(end_size, max_blksz); |
|
691 |
} |
|
692 |
error = zfs_grow_blocksize(zp, new_blksz, tx); |
|
693 |
if (error) { |
|
694 |
tx_bytes = 0; |
|
695 |
goto tx_done; |
|
696 |
} |
|
697 |
} |
|
698 |
||
699 |
if (grow_rw == RW_WRITER) { |
|
700 |
rw_downgrade(&zp->z_grow_lock); |
|
701 |
grow_rw = RW_READER; |
|
702 |
} |
|
703 |
||
704 |
/* |
|
705 |
* The file data does not fit in the znode "cache", so we |
|
706 |
* will be writing to the file block data buffers. |
|
707 |
* Each buffer will be written in a separate transaction; |
|
708 |
* this keeps the intent log records small and allows us |
|
709 |
* to do more fine-grained space accounting. |
|
710 |
*/ |
|
711 |
while (n > 0) { |
|
712 |
/* |
|
713 |
* XXX - should we really limit each write to z_max_blksz? |
|
714 |
* Perhaps we should use SPA_MAXBLOCKSIZE chunks? |
|
715 |
*/ |
|
716 |
nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz)); |
|
717 |
rw_enter(&zp->z_map_lock, RW_READER); |
|
718 |
||
719 |
tx_bytes = uio->uio_resid; |
|
720 |
if (vn_has_cached_data(vp)) { |
|
721 |
rw_exit(&zp->z_map_lock); |
|
722 |
error = mappedwrite(vp, woff, nbytes, uio, tx); |
|
723 |
} else { |
|
724 |
error = dmu_write_uio(zfsvfs->z_os, zp->z_id, |
|
725 |
woff, nbytes, uio, tx); |
|
726 |
rw_exit(&zp->z_map_lock); |
|
727 |
} |
|
728 |
tx_bytes -= uio->uio_resid; |
|
729 |
||
730 |
if (error) { |
|
731 |
/* XXX - do we need to "clean up" the dmu buffer? */ |
|
732 |
break; |
|
733 |
} |
|
734 |
||
735 |
ASSERT(tx_bytes == nbytes); |
|
736 |
||
737 |
n -= nbytes; |
|
738 |
if (n <= 0) |
|
739 |
break; |
|
740 |
||
741 |
/* |
|
742 |
* We have more work ahead of us, so wrap up this transaction |
|
743 |
* and start another. Exact same logic as tx_done below. |
|
744 |
*/ |
|
745 |
while ((end_size = zp->z_phys->zp_size) < uio->uio_loffset) { |
|
746 |
dmu_buf_will_dirty(zp->z_dbuf, tx); |
|
747 |
(void) atomic_cas_64(&zp->z_phys->zp_size, end_size, |
|
748 |
uio->uio_loffset); |
|
749 |
} |
|
750 |
zfs_time_stamper(zp, CONTENT_MODIFIED, tx); |
|
751 |
seq = zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, |
|
752 |
ioflag, uio); |
|
753 |
dmu_tx_commit(tx); |
|
754 |
||
755 |
/* Pre-fault the next set of pages */ |
|
756 |
zfs_prefault_write(MIN(n, SPA_MAXBLOCKSIZE), uio); |
|
757 |
||
758 |
/* |
|
759 |
* Start another transaction. |
|
760 |
*/ |
|
761 |
woff = uio->uio_loffset; |
|
762 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
763 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
764 |
dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz)); |
|
765 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
766 |
if (error) { |
|
767 |
dmu_tx_abort(tx); |
|
768 |
rw_exit(&zp->z_grow_lock); |
|
769 |
if (error == ERESTART && |
|
770 |
zfsvfs->z_assign == TXG_NOWAIT) { |
|
771 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
772 |
goto top; |
|
773 |
} |
|
774 |
goto no_tx_done; |
|
775 |
} |
|
776 |
} |
|
777 |
||
778 |
tx_done: |
|
779 |
||
780 |
if (tx_bytes != 0) { |
|
781 |
/* |
|
782 |
* Update the file size if it has changed; account |
|
783 |
* for possible concurrent updates. |
|
784 |
*/ |
|
785 |
while ((end_size = zp->z_phys->zp_size) < uio->uio_loffset) { |
|
786 |
dmu_buf_will_dirty(zp->z_dbuf, tx); |
|
787 |
(void) atomic_cas_64(&zp->z_phys->zp_size, end_size, |
|
788 |
uio->uio_loffset); |
|
789 |
} |
|
790 |
zfs_time_stamper(zp, CONTENT_MODIFIED, tx); |
|
791 |
seq = zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, |
|
792 |
ioflag, uio); |
|
793 |
} |
|
794 |
dmu_tx_commit(tx); |
|
795 |
||
796 |
rw_exit(&zp->z_grow_lock); |
|
797 |
||
798 |
no_tx_done: |
|
799 |
||
800 |
if (need_append_lock) |
|
801 |
rw_exit(&zp->z_append_lock); |
|
802 |
||
803 |
/* |
|
804 |
* If we're in replay mode, or we made no progress, return error. |
|
805 |
* Otherwise, it's at least a partial write, so it's successful. |
|
806 |
*/ |
|
807 |
if (zfsvfs->z_assign >= TXG_INITIAL || uio->uio_resid == start_resid) { |
|
808 |
ZFS_EXIT(zfsvfs); |
|
809 |
return (error); |
|
810 |
} |
|
811 |
||
812 |
zil_commit(zilog, seq, ioflag & (FSYNC | FDSYNC)); |
|
813 |
||
814 |
ZFS_EXIT(zfsvfs); |
|
815 |
return (0); |
|
816 |
} |
|
817 |
||
818 |
/* |
|
819 |
* Get data to generate a TX_WRITE intent log record. |
|
820 |
*/ |
|
821 |
int |
|
822 |
zfs_get_data(void *arg, lr_write_t *lr) |
|
823 |
{ |
|
824 |
zfsvfs_t *zfsvfs = arg; |
|
825 |
objset_t *os = zfsvfs->z_os; |
|
826 |
znode_t *zp; |
|
827 |
uint64_t off = lr->lr_offset; |
|
828 |
int dlen = lr->lr_length; /* length of user data */ |
|
829 |
int reclen = lr->lr_common.lrc_reclen; |
|
830 |
int error = 0; |
|
831 |
||
832 |
ASSERT(dlen != 0); |
|
833 |
||
834 |
/* |
|
835 |
* Nothing to do if the file has been removed or truncated. |
|
836 |
*/ |
|
837 |
if (zfs_zget(zfsvfs, lr->lr_foid, &zp) != 0) |
|
838 |
return (ENOENT); |
|
839 |
if (off >= zp->z_phys->zp_size || zp->z_reap) { |
|
840 |
VN_RELE(ZTOV(zp)); |
|
841 |
return (ENOENT); |
|
842 |
} |
|
843 |
||
844 |
/* |
|
845 |
* Write records come in two flavors: immediate and indirect. |
|
846 |
* For small writes it's cheaper to store the data with the |
|
847 |
* log record (immediate); for large writes it's cheaper to |
|
848 |
* sync the data and get a pointer to it (indirect) so that |
|
849 |
* we don't have to write the data twice. |
|
850 |
*/ |
|
851 |
if (sizeof (lr_write_t) + dlen <= reclen) { /* immediate write */ |
|
852 |
rw_enter(&zp->z_grow_lock, RW_READER); |
|
853 |
dmu_buf_t *db = dmu_buf_hold(os, lr->lr_foid, off); |
|
854 |
dmu_buf_read(db); |
|
855 |
bcopy((char *)db->db_data + off - db->db_offset, lr + 1, dlen); |
|
856 |
dmu_buf_rele(db); |
|
857 |
rw_exit(&zp->z_grow_lock); |
|
858 |
} else { |
|
859 |
/* |
|
860 |
* We have to grab z_grow_lock as RW_WRITER because |
|
861 |
* dmu_sync() can't handle concurrent dbuf_dirty() (6313856). |
|
862 |
* z_grow_lock will be replaced with a range lock soon, |
|
863 |
* which will eliminate the concurrency hit, but dmu_sync() |
|
864 |
* really needs more thought. It shouldn't have to rely on |
|
865 |
* the caller to provide MT safety. |
|
866 |
*/ |
|
867 |
rw_enter(&zp->z_grow_lock, RW_WRITER); |
|
868 |
txg_suspend(dmu_objset_pool(os)); |
|
869 |
error = dmu_sync(os, lr->lr_foid, off, &lr->lr_blkoff, |
|
870 |
&lr->lr_blkptr, lr->lr_common.lrc_txg); |
|
871 |
txg_resume(dmu_objset_pool(os)); |
|
872 |
rw_exit(&zp->z_grow_lock); |
|
873 |
} |
|
874 |
VN_RELE(ZTOV(zp)); |
|
875 |
return (error); |
|
876 |
} |
|
877 |
||
878 |
/*ARGSUSED*/ |
|
879 |
static int |
|
880 |
zfs_access(vnode_t *vp, int mode, int flags, cred_t *cr) |
|
881 |
{ |
|
882 |
znode_t *zp = VTOZ(vp); |
|
883 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
884 |
int error; |
|
885 |
||
886 |
ZFS_ENTER(zfsvfs); |
|
887 |
error = zfs_zaccess_rwx(zp, mode, cr); |
|
888 |
ZFS_EXIT(zfsvfs); |
|
889 |
return (error); |
|
890 |
} |
|
891 |
||
892 |
/* |
|
893 |
* Lookup an entry in a directory, or an extended attribute directory. |
|
894 |
* If it exists, return a held vnode reference for it. |
|
895 |
* |
|
896 |
* IN: dvp - vnode of directory to search. |
|
897 |
* nm - name of entry to lookup. |
|
898 |
* pnp - full pathname to lookup [UNUSED]. |
|
899 |
* flags - LOOKUP_XATTR set if looking for an attribute. |
|
900 |
* rdir - root directory vnode [UNUSED]. |
|
901 |
* cr - credentials of caller. |
|
902 |
* |
|
903 |
* OUT: vpp - vnode of located entry, NULL if not found. |
|
904 |
* |
|
905 |
* RETURN: 0 if success |
|
906 |
* error code if failure |
|
907 |
* |
|
908 |
* Timestamps: |
|
909 |
* NA |
|
910 |
*/ |
|
911 |
/* ARGSUSED */ |
|
912 |
static int |
|
913 |
zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp, |
|
914 |
int flags, vnode_t *rdir, cred_t *cr) |
|
915 |
{ |
|
916 |
||
917 |
znode_t *zdp = VTOZ(dvp); |
|
918 |
zfsvfs_t *zfsvfs = zdp->z_zfsvfs; |
|
919 |
int error; |
|
920 |
||
921 |
ZFS_ENTER(zfsvfs); |
|
922 |
||
923 |
*vpp = NULL; |
|
924 |
||
925 |
if (flags & LOOKUP_XATTR) { |
|
926 |
/* |
|
927 |
* We don't allow recursive attributes.. |
|
928 |
* Maybe someday we will. |
|
929 |
*/ |
|
930 |
if (zdp->z_phys->zp_flags & ZFS_XATTR) { |
|
931 |
ZFS_EXIT(zfsvfs); |
|
932 |
return (EINVAL); |
|
933 |
} |
|
934 |
||
935 |
if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr)) { |
|
936 |
ZFS_EXIT(zfsvfs); |
|
937 |
return (error); |
|
938 |
} |
|
939 |
||
940 |
/* |
|
941 |
* Do we have permission to get into attribute directory? |
|
942 |
*/ |
|
943 |
||
944 |
if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, cr)) { |
|
945 |
VN_RELE(*vpp); |
|
946 |
} |
|
947 |
||
948 |
ZFS_EXIT(zfsvfs); |
|
949 |
return (error); |
|
950 |
} |
|
951 |
||
952 |
/* |
|
953 |
* Check accessibility of directory. |
|
954 |
*/ |
|
955 |
||
956 |
if (error = zfs_zaccess(zdp, ACE_EXECUTE, cr)) { |
|
957 |
ZFS_EXIT(zfsvfs); |
|
958 |
return (error); |
|
959 |
} |
|
960 |
||
961 |
if ((error = zfs_dirlook(zdp, nm, vpp)) == 0) { |
|
962 |
||
963 |
/* |
|
964 |
* Convert device special files |
|
965 |
*/ |
|
966 |
if (IS_DEVVP(*vpp)) { |
|
967 |
vnode_t *svp; |
|
968 |
||
969 |
svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); |
|
970 |
VN_RELE(*vpp); |
|
971 |
if (svp == NULL) |
|
972 |
error = ENOSYS; |
|
973 |
else |
|
974 |
*vpp = svp; |
|
975 |
} |
|
976 |
} |
|
977 |
||
978 |
ZFS_EXIT(zfsvfs); |
|
979 |
return (error); |
|
980 |
} |
|
981 |
||
982 |
/* |
|
983 |
* Attempt to create a new entry in a directory. If the entry |
|
984 |
* already exists, truncate the file if permissible, else return |
|
985 |
* an error. Return the vp of the created or trunc'd file. |
|
986 |
* |
|
987 |
* IN: dvp - vnode of directory to put new file entry in. |
|
988 |
* name - name of new file entry. |
|
989 |
* vap - attributes of new file. |
|
990 |
* excl - flag indicating exclusive or non-exclusive mode. |
|
991 |
* mode - mode to open file with. |
|
992 |
* cr - credentials of caller. |
|
993 |
* flag - large file flag [UNUSED]. |
|
994 |
* |
|
995 |
* OUT: vpp - vnode of created or trunc'd entry. |
|
996 |
* |
|
997 |
* RETURN: 0 if success |
|
998 |
* error code if failure |
|
999 |
* |
|
1000 |
* Timestamps: |
|
1001 |
* dvp - ctime|mtime updated if new entry created |
|
1002 |
* vp - ctime|mtime always, atime if new |
|
1003 |
*/ |
|
1004 |
/* ARGSUSED */ |
|
1005 |
static int |
|
1006 |
zfs_create(vnode_t *dvp, char *name, vattr_t *vap, vcexcl_t excl, |
|
1007 |
int mode, vnode_t **vpp, cred_t *cr, int flag) |
|
1008 |
{ |
|
1009 |
znode_t *zp, *dzp = VTOZ(dvp); |
|
1010 |
zfsvfs_t *zfsvfs = dzp->z_zfsvfs; |
|
1011 |
zilog_t *zilog = zfsvfs->z_log; |
|
1012 |
uint64_t seq = 0; |
|
1013 |
objset_t *os = zfsvfs->z_os; |
|
1014 |
zfs_dirlock_t *dl; |
|
1015 |
dmu_tx_t *tx; |
|
1016 |
int error; |
|
1017 |
uint64_t zoid; |
|
1018 |
||
1019 |
ZFS_ENTER(zfsvfs); |
|
1020 |
||
1021 |
top: |
|
1022 |
*vpp = NULL; |
|
1023 |
||
1024 |
if ((vap->va_mode & VSVTX) && secpolicy_vnode_stky_modify(cr)) |
|
1025 |
vap->va_mode &= ~VSVTX; |
|
1026 |
||
1027 |
if (*name == '\0') { |
|
1028 |
/* |
|
1029 |
* Null component name refers to the directory itself. |
|
1030 |
*/ |
|
1031 |
VN_HOLD(dvp); |
|
1032 |
zp = dzp; |
|
1033 |
dl = NULL; |
|
1034 |
error = 0; |
|
1035 |
} else { |
|
1036 |
/* possible VN_HOLD(zp) */ |
|
1037 |
if (error = zfs_dirent_lock(&dl, dzp, name, &zp, 0)) { |
|
1038 |
if (strcmp(name, "..") == 0) |
|
1039 |
error = EISDIR; |
|
1040 |
ZFS_EXIT(zfsvfs); |
|
1041 |
return (error); |
|
1042 |
} |
|
1043 |
} |
|
1044 |
||
1045 |
zoid = zp ? zp->z_id : -1ULL; |
|
1046 |
||
1047 |
if (zp == NULL) { |
|
1048 |
/* |
|
1049 |
* Create a new file object and update the directory |
|
1050 |
* to reference it. |
|
1051 |
*/ |
|
1052 |
if (error = zfs_zaccess(dzp, ACE_ADD_FILE, cr)) { |
|
1053 |
goto out; |
|
1054 |
} |
|
1055 |
||
1056 |
/* |
|
1057 |
* We only support the creation of regular files in |
|
1058 |
* extended attribute directories. |
|
1059 |
*/ |
|
1060 |
if ((dzp->z_phys->zp_flags & ZFS_XATTR) && |
|
1061 |
(vap->va_type != VREG)) { |
|
1062 |
error = EINVAL; |
|
1063 |
goto out; |
|
1064 |
} |
|
1065 |
||
1066 |
tx = dmu_tx_create(os); |
|
1067 |
dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); |
|
1068 |
dmu_tx_hold_bonus(tx, dzp->z_id); |
|
1069 |
dmu_tx_hold_zap(tx, dzp->z_id, 1); |
|
1070 |
if (dzp->z_phys->zp_flags & ZFS_INHERIT_ACE) |
|
1071 |
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, |
|
1072 |
0, SPA_MAXBLOCKSIZE); |
|
1073 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
1074 |
if (error) { |
|
1075 |
dmu_tx_abort(tx); |
|
1076 |
zfs_dirent_unlock(dl); |
|
1077 |
if (error == ERESTART && |
|
1078 |
zfsvfs->z_assign == TXG_NOWAIT) { |
|
1079 |
txg_wait_open(dmu_objset_pool(os), 0); |
|
1080 |
goto top; |
|
1081 |
} |
|
1082 |
ZFS_EXIT(zfsvfs); |
|
1083 |
return (error); |
|
1084 |
} |
|
1085 |
zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, 0); |
|
1086 |
ASSERT(zp->z_id == zoid); |
|
1087 |
(void) zfs_link_create(dl, zp, tx, ZNEW); |
|
1088 |
seq = zfs_log_create(zilog, tx, TX_CREATE, dzp, zp, name); |
|
1089 |
dmu_tx_commit(tx); |
|
1090 |
} else { |
|
1091 |
/* |
|
1092 |
* A directory entry already exists for this name. |
|
1093 |
*/ |
|
1094 |
/* |
|
1095 |
* Can't truncate an existing file if in exclusive mode. |
|
1096 |
*/ |
|
1097 |
if (excl == EXCL) { |
|
1098 |
error = EEXIST; |
|
1099 |
goto out; |
|
1100 |
} |
|
1101 |
/* |
|
1102 |
* Can't open a directory for writing. |
|
1103 |
*/ |
|
1104 |
if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) { |
|
1105 |
error = EISDIR; |
|
1106 |
goto out; |
|
1107 |
} |
|
1108 |
/* |
|
1109 |
* Verify requested access to file. |
|
1110 |
*/ |
|
1111 |
if (mode && (error = zfs_zaccess_rwx(zp, mode, cr))) { |
|
1112 |
goto out; |
|
1113 |
} |
|
1114 |
/* |
|
1115 |
* Truncate regular files if requested. |
|
1116 |
*/ |
|
1117 |
||
1118 |
/* |
|
1119 |
* Need to update dzp->z_seq? |
|
1120 |
*/ |
|
1121 |
||
1122 |
mutex_enter(&dzp->z_lock); |
|
1123 |
dzp->z_seq++; |
|
1124 |
mutex_exit(&dzp->z_lock); |
|
1125 |
||
1126 |
if ((ZTOV(zp)->v_type == VREG) && (zp->z_phys->zp_size != 0) && |
|
1127 |
(vap->va_mask & AT_SIZE) && (vap->va_size == 0)) { |
|
1128 |
/* |
|
1129 |
* Truncate the file. |
|
1130 |
*/ |
|
1131 |
tx = dmu_tx_create(os); |
|
1132 |
dmu_tx_hold_bonus(tx, zoid); |
|
1133 |
dmu_tx_hold_free(tx, zoid, 0, DMU_OBJECT_END); |
|
1134 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
1135 |
if (error) { |
|
1136 |
dmu_tx_abort(tx); |
|
1137 |
if (dl) |
|
1138 |
zfs_dirent_unlock(dl); |
|
1139 |
VN_RELE(ZTOV(zp)); |
|
1140 |
if (error == ERESTART && |
|
1141 |
zfsvfs->z_assign == TXG_NOWAIT) { |
|
1142 |
txg_wait_open(dmu_objset_pool(os), 0); |
|
1143 |
goto top; |
|
1144 |
} |
|
1145 |
ZFS_EXIT(zfsvfs); |
|
1146 |
return (error); |
|
1147 |
} |
|
1148 |
/* |
|
1149 |
* Grab the grow_lock to serialize this change with |
|
1150 |
* respect to other file manipulations. |
|
1151 |
*/ |
|
1152 |
rw_enter(&zp->z_grow_lock, RW_WRITER); |
|
1153 |
error = zfs_freesp(zp, 0, 0, mode, tx, cr); |
|
1154 |
if (error == 0) { |
|
1155 |
zfs_time_stamper(zp, CONTENT_MODIFIED, tx); |
|
1156 |
seq = zfs_log_truncate(zilog, tx, |
|
1157 |
TX_TRUNCATE, zp, 0, 0); |
|
1158 |
} |
|
1159 |
rw_exit(&zp->z_grow_lock); |
|
1160 |
dmu_tx_commit(tx); |
|
1161 |
} |
|
1162 |
} |
|
1163 |
out: |
|
1164 |
||
1165 |
if (dl) |
|
1166 |
zfs_dirent_unlock(dl); |
|
1167 |
||
1168 |
if (error) { |
|
1169 |
if (zp) |
|
1170 |
VN_RELE(ZTOV(zp)); |
|
1171 |
} else { |
|
1172 |
*vpp = ZTOV(zp); |
|
1173 |
/* |
|
1174 |
* If vnode is for a device return a specfs vnode instead. |
|
1175 |
*/ |
|
1176 |
if (IS_DEVVP(*vpp)) { |
|
1177 |
struct vnode *svp; |
|
1178 |
||
1179 |
svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); |
|
1180 |
VN_RELE(*vpp); |
|
1181 |
if (svp == NULL) { |
|
1182 |
error = ENOSYS; |
|
1183 |
} |
|
1184 |
*vpp = svp; |
|
1185 |
} |
|
1186 |
} |
|
1187 |
||
1188 |
zil_commit(zilog, seq, 0); |
|
1189 |
||
1190 |
ZFS_EXIT(zfsvfs); |
|
1191 |
return (error); |
|
1192 |
} |
|
1193 |
||
1194 |
/* |
|
1195 |
* Remove an entry from a directory. |
|
1196 |
* |
|
1197 |
* IN: dvp - vnode of directory to remove entry from. |
|
1198 |
* name - name of entry to remove. |
|
1199 |
* cr - credentials of caller. |
|
1200 |
* |
|
1201 |
* RETURN: 0 if success |
|
1202 |
* error code if failure |
|
1203 |
* |
|
1204 |
* Timestamps: |
|
1205 |
* dvp - ctime|mtime |
|
1206 |
* vp - ctime (if nlink > 0) |
|
1207 |
*/ |
|
1208 |
static int |
|
1209 |
zfs_remove(vnode_t *dvp, char *name, cred_t *cr) |
|
1210 |
{ |
|
1211 |
znode_t *zp, *dzp = VTOZ(dvp); |
|
1212 |
znode_t *xzp = NULL; |
|
1213 |
vnode_t *vp; |
|
1214 |
zfsvfs_t *zfsvfs = dzp->z_zfsvfs; |
|
1215 |
zilog_t *zilog = zfsvfs->z_log; |
|
1216 |
uint64_t seq = 0; |
|
1217 |
uint64_t acl_obj, xattr_obj; |
|
1218 |
zfs_dirlock_t *dl; |
|
1219 |
dmu_tx_t *tx; |
|
1220 |
int may_delete_now, delete_now = FALSE; |
|
1221 |
int reaped; |
|
1222 |
int error; |
|
1223 |
||
1224 |
ZFS_ENTER(zfsvfs); |
|
1225 |
||
1226 |
top: |
|
1227 |
/* |
|
1228 |
* Attempt to lock directory; fail if entry doesn't exist. |
|
1229 |
*/ |
|
1230 |
if (error = zfs_dirent_lock(&dl, dzp, name, &zp, ZEXISTS)) { |
|
1231 |
ZFS_EXIT(zfsvfs); |
|
1232 |
return (error); |
|
1233 |
} |
|
1234 |
||
1235 |
vp = ZTOV(zp); |
|
1236 |
||
1237 |
if (error = zfs_zaccess_delete(dzp, zp, cr)) { |
|
1238 |
goto out; |
|
1239 |
} |
|
1240 |
||
1241 |
/* |
|
1242 |
* Need to use rmdir for removing directories. |
|
1243 |
*/ |
|
1244 |
if (vp->v_type == VDIR) { |
|
1245 |
error = EPERM; |
|
1246 |
goto out; |
|
1247 |
} |
|
1248 |
||
1249 |
vnevent_remove(vp); |
|
1250 |
||
1251 |
mutex_enter(&vp->v_lock); |
|
1252 |
may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp); |
|
1253 |
mutex_exit(&vp->v_lock); |
|
1254 |
||
1255 |
/* |
|
1256 |
* We may delete the znode now, or we may put it on the delete queue; |
|
1257 |
* it depends on whether we're the last link, and on whether there are |
|
1258 |
* other holds on the vnode. So we dmu_tx_hold() the right things to |
|
1259 |
* allow for either case. |
|
1260 |
*/ |
|
1261 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
1262 |
dmu_tx_hold_zap(tx, dzp->z_id, -1); |
|
1263 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
1264 |
if (may_delete_now) |
|
1265 |
dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END); |
|
1266 |
||
1267 |
/* are there any extended attributes? */ |
|
1268 |
if ((xattr_obj = zp->z_phys->zp_xattr) != 0) { |
|
1269 |
/* |
|
1270 |
* XXX - There is a possibility that the delete |
|
1271 |
* of the parent file could succeed, but then we get |
|
1272 |
* an ENOSPC when we try to delete the xattrs... |
|
1273 |
* so we would need to re-try the deletes periodically |
|
1274 |
*/ |
|
1275 |
/* XXX - do we need this if we are deleting? */ |
|
1276 |
dmu_tx_hold_bonus(tx, xattr_obj); |
|
1277 |
} |
|
1278 |
||
1279 |
/* are there any additional acls */ |
|
1280 |
if ((acl_obj = zp->z_phys->zp_acl.z_acl_extern_obj) != 0 && |
|
1281 |
may_delete_now) |
|
1282 |
dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); |
|
1283 |
||
1284 |
/* charge as an update -- would be nice not to charge at all */ |
|
1285 |
dmu_tx_hold_zap(tx, zfsvfs->z_dqueue, -1); |
|
1286 |
||
1287 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
1288 |
if (error) { |
|
1289 |
dmu_tx_abort(tx); |
|
1290 |
zfs_dirent_unlock(dl); |
|
1291 |
VN_RELE(vp); |
|
1292 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
1293 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
1294 |
goto top; |
|
1295 |
} |
|
1296 |
ZFS_EXIT(zfsvfs); |
|
1297 |
return (error); |
|
1298 |
} |
|
1299 |
||
1300 |
/* |
|
1301 |
* Remove the directory entry. |
|
1302 |
*/ |
|
1303 |
error = zfs_link_destroy(dl, zp, tx, 0, &reaped); |
|
1304 |
||
1305 |
if (error) { |
|
1306 |
dmu_tx_commit(tx); |
|
1307 |
goto out; |
|
1308 |
} |
|
1309 |
||
1310 |
if (reaped) { |
|
1311 |
mutex_enter(&vp->v_lock); |
|
1312 |
delete_now = may_delete_now && |
|
1313 |
vp->v_count == 1 && !vn_has_cached_data(vp) && |
|
1314 |
zp->z_phys->zp_xattr == xattr_obj && |
|
1315 |
zp->z_phys->zp_acl.z_acl_extern_obj == acl_obj; |
|
1316 |
mutex_exit(&vp->v_lock); |
|
1317 |
} |
|
1318 |
||
1319 |
if (delete_now) { |
|
1320 |
if (zp->z_phys->zp_xattr) { |
|
1321 |
error = zfs_zget(zfsvfs, zp->z_phys->zp_xattr, &xzp); |
|
1322 |
ASSERT3U(error, ==, 0); |
|
1323 |
ASSERT3U(xzp->z_phys->zp_links, ==, 2); |
|
1324 |
dmu_buf_will_dirty(xzp->z_dbuf, tx); |
|
1325 |
mutex_enter(&xzp->z_lock); |
|
1326 |
xzp->z_reap = 1; |
|
1327 |
xzp->z_phys->zp_links = 0; |
|
1328 |
mutex_exit(&xzp->z_lock); |
|
1329 |
zfs_dq_add(xzp, tx); |
|
1330 |
zp->z_phys->zp_xattr = 0; /* probably unnecessary */ |
|
1331 |
} |
|
1332 |
mutex_enter(&zp->z_lock); |
|
1333 |
mutex_enter(&vp->v_lock); |
|
1334 |
vp->v_count--; |
|
1335 |
ASSERT3U(vp->v_count, ==, 0); |
|
1336 |
mutex_exit(&vp->v_lock); |
|
1337 |
zp->z_active = 0; |
|
1338 |
mutex_exit(&zp->z_lock); |
|
1339 |
zfs_znode_delete(zp, tx); |
|
1340 |
VFS_RELE(zfsvfs->z_vfs); |
|
1341 |
} else if (reaped) { |
|
1342 |
zfs_dq_add(zp, tx); |
|
1343 |
} |
|
1344 |
||
1345 |
seq = zfs_log_remove(zilog, tx, TX_REMOVE, dzp, name); |
|
1346 |
||
1347 |
dmu_tx_commit(tx); |
|
1348 |
out: |
|
1349 |
zfs_dirent_unlock(dl); |
|
1350 |
||
1351 |
if (!delete_now) { |
|
1352 |
VN_RELE(vp); |
|
1353 |
} else if (xzp) { |
|
1354 |
/* this rele delayed to prevent nesting transactions */ |
|
1355 |
VN_RELE(ZTOV(xzp)); |
|
1356 |
} |
|
1357 |
||
1358 |
zil_commit(zilog, seq, 0); |
|
1359 |
||
1360 |
ZFS_EXIT(zfsvfs); |
|
1361 |
return (error); |
|
1362 |
} |
|
1363 |
||
1364 |
/* |
|
1365 |
* Create a new directory and insert it into dvp using the name |
|
1366 |
* provided. Return a pointer to the inserted directory. |
|
1367 |
* |
|
1368 |
* IN: dvp - vnode of directory to add subdir to. |
|
1369 |
* dirname - name of new directory. |
|
1370 |
* vap - attributes of new directory. |
|
1371 |
* cr - credentials of caller. |
|
1372 |
* |
|
1373 |
* OUT: vpp - vnode of created directory. |
|
1374 |
* |
|
1375 |
* RETURN: 0 if success |
|
1376 |
* error code if failure |
|
1377 |
* |
|
1378 |
* Timestamps: |
|
1379 |
* dvp - ctime|mtime updated |
|
1380 |
* vp - ctime|mtime|atime updated |
|
1381 |
*/ |
|
1382 |
static int |
|
1383 |
zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr) |
|
1384 |
{ |
|
1385 |
znode_t *zp, *dzp = VTOZ(dvp); |
|
1386 |
zfsvfs_t *zfsvfs = dzp->z_zfsvfs; |
|
1387 |
zilog_t *zilog = zfsvfs->z_log; |
|
1388 |
uint64_t seq = 0; |
|
1389 |
zfs_dirlock_t *dl; |
|
1390 |
uint64_t zoid = 0; |
|
1391 |
dmu_tx_t *tx; |
|
1392 |
int error; |
|
1393 |
||
1394 |
ASSERT(vap->va_type == VDIR); |
|
1395 |
||
1396 |
ZFS_ENTER(zfsvfs); |
|
1397 |
||
1398 |
if (dzp->z_phys->zp_flags & ZFS_XATTR) { |
|
1399 |
ZFS_EXIT(zfsvfs); |
|
1400 |
return (EINVAL); |
|
1401 |
} |
|
1402 |
top: |
|
1403 |
*vpp = NULL; |
|
1404 |
||
1405 |
/* |
|
1406 |
* First make sure the new directory doesn't exist. |
|
1407 |
*/ |
|
1408 |
if (error = zfs_dirent_lock(&dl, dzp, dirname, &zp, ZNEW)) { |
|
1409 |
ZFS_EXIT(zfsvfs); |
|
1410 |
return (error); |
|
1411 |
} |
|
1412 |
||
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1413 |
if (error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, cr)) { |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1414 |
zfs_dirent_unlock(dl); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1415 |
ZFS_EXIT(zfsvfs); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1416 |
return (error); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1417 |
} |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1418 |
|
789 | 1419 |
/* |
1420 |
* Add a new entry to the directory. |
|
1421 |
*/ |
|
1422 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
1423 |
dmu_tx_hold_zap(tx, dzp->z_id, 1); |
|
1424 |
dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, 0); |
|
1425 |
if (dzp->z_phys->zp_flags & ZFS_INHERIT_ACE) |
|
1426 |
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, |
|
1427 |
0, SPA_MAXBLOCKSIZE); |
|
1428 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
1429 |
if (error) { |
|
1430 |
dmu_tx_abort(tx); |
|
1431 |
zfs_dirent_unlock(dl); |
|
1432 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
1433 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
1434 |
goto top; |
|
1435 |
} |
|
1436 |
ZFS_EXIT(zfsvfs); |
|
1437 |
return (error); |
|
1438 |
} |
|
1439 |
||
1440 |
/* |
|
1441 |
* Create new node. |
|
1442 |
*/ |
|
1443 |
zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, 0); |
|
1444 |
||
1445 |
/* |
|
1446 |
* Now put new name in parent dir. |
|
1447 |
*/ |
|
1448 |
(void) zfs_link_create(dl, zp, tx, ZNEW); |
|
1449 |
||
1450 |
*vpp = ZTOV(zp); |
|
1451 |
||
1452 |
seq = zfs_log_create(zilog, tx, TX_MKDIR, dzp, zp, dirname); |
|
1453 |
dmu_tx_commit(tx); |
|
1454 |
||
1455 |
zfs_dirent_unlock(dl); |
|
1456 |
||
1457 |
zil_commit(zilog, seq, 0); |
|
1458 |
||
1459 |
ZFS_EXIT(zfsvfs); |
|
1460 |
return (0); |
|
1461 |
} |
|
1462 |
||
1463 |
/* |
|
1464 |
* Remove a directory subdir entry. If the current working |
|
1465 |
* directory is the same as the subdir to be removed, the |
|
1466 |
* remove will fail. |
|
1467 |
* |
|
1468 |
* IN: dvp - vnode of directory to remove from. |
|
1469 |
* name - name of directory to be removed. |
|
1470 |
* cwd - vnode of current working directory. |
|
1471 |
* cr - credentials of caller. |
|
1472 |
* |
|
1473 |
* RETURN: 0 if success |
|
1474 |
* error code if failure |
|
1475 |
* |
|
1476 |
* Timestamps: |
|
1477 |
* dvp - ctime|mtime updated |
|
1478 |
*/ |
|
1479 |
static int |
|
1480 |
zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr) |
|
1481 |
{ |
|
1482 |
znode_t *dzp = VTOZ(dvp); |
|
1483 |
znode_t *zp; |
|
1484 |
vnode_t *vp; |
|
1485 |
zfsvfs_t *zfsvfs = dzp->z_zfsvfs; |
|
1486 |
zilog_t *zilog = zfsvfs->z_log; |
|
1487 |
uint64_t seq = 0; |
|
1488 |
zfs_dirlock_t *dl; |
|
1489 |
dmu_tx_t *tx; |
|
1490 |
int error; |
|
1491 |
||
1492 |
ZFS_ENTER(zfsvfs); |
|
1493 |
||
1494 |
top: |
|
1495 |
zp = NULL; |
|
1496 |
||
1497 |
/* |
|
1498 |
* Attempt to lock directory; fail if entry doesn't exist. |
|
1499 |
*/ |
|
1500 |
if (error = zfs_dirent_lock(&dl, dzp, name, &zp, ZEXISTS)) { |
|
1501 |
ZFS_EXIT(zfsvfs); |
|
1502 |
return (error); |
|
1503 |
} |
|
1504 |
||
1505 |
vp = ZTOV(zp); |
|
1506 |
||
1507 |
if (error = zfs_zaccess_delete(dzp, zp, cr)) { |
|
1508 |
goto out; |
|
1509 |
} |
|
1510 |
||
1511 |
if (vp->v_type != VDIR) { |
|
1512 |
error = ENOTDIR; |
|
1513 |
goto out; |
|
1514 |
} |
|
1515 |
||
1516 |
if (vp == cwd) { |
|
1517 |
error = EINVAL; |
|
1518 |
goto out; |
|
1519 |
} |
|
1520 |
||
1521 |
vnevent_rmdir(vp); |
|
1522 |
||
1523 |
/* |
|
1524 |
* Grab a lock on the parent pointer make sure we play well |
|
1525 |
* with the treewalk and directory rename code. |
|
1526 |
*/ |
|
1527 |
rw_enter(&zp->z_parent_lock, RW_WRITER); |
|
1528 |
||
1529 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
1530 |
dmu_tx_hold_zap(tx, dzp->z_id, 1); |
|
1531 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
1532 |
dmu_tx_hold_zap(tx, zfsvfs->z_dqueue, 1); |
|
1533 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
1534 |
if (error) { |
|
1535 |
dmu_tx_abort(tx); |
|
1536 |
rw_exit(&zp->z_parent_lock); |
|
1537 |
zfs_dirent_unlock(dl); |
|
1538 |
VN_RELE(vp); |
|
1539 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
1540 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
1541 |
goto top; |
|
1542 |
} |
|
1543 |
ZFS_EXIT(zfsvfs); |
|
1544 |
return (error); |
|
1545 |
} |
|
1546 |
||
1547 |
error = zfs_link_destroy(dl, zp, tx, 0, NULL); |
|
1548 |
||
1549 |
if (error == 0) |
|
1550 |
seq = zfs_log_remove(zilog, tx, TX_RMDIR, dzp, name); |
|
1551 |
||
1552 |
dmu_tx_commit(tx); |
|
1553 |
||
1554 |
rw_exit(&zp->z_parent_lock); |
|
1555 |
out: |
|
1556 |
zfs_dirent_unlock(dl); |
|
1557 |
||
1558 |
VN_RELE(vp); |
|
1559 |
||
1560 |
zil_commit(zilog, seq, 0); |
|
1561 |
||
1562 |
ZFS_EXIT(zfsvfs); |
|
1563 |
return (error); |
|
1564 |
} |
|
1565 |
||
1566 |
/* |
|
1567 |
* Read as many directory entries as will fit into the provided |
|
1568 |
* buffer from the given directory cursor position (specified in |
|
1569 |
* the uio structure. |
|
1570 |
* |
|
1571 |
* IN: vp - vnode of directory to read. |
|
1572 |
* uio - structure supplying read location, range info, |
|
1573 |
* and return buffer. |
|
1574 |
* cr - credentials of caller. |
|
1575 |
* |
|
1576 |
* OUT: uio - updated offset and range, buffer filled. |
|
1577 |
* eofp - set to true if end-of-file detected. |
|
1578 |
* |
|
1579 |
* RETURN: 0 if success |
|
1580 |
* error code if failure |
|
1581 |
* |
|
1582 |
* Timestamps: |
|
1583 |
* vp - atime updated |
|
1584 |
* |
|
1585 |
* Note that the low 4 bits of the cookie returned by zap is always zero. |
|
1586 |
* This allows us to use the low range for "special" directory entries: |
|
1587 |
* We use 0 for '.', and 1 for '..'. If this is the root of the filesystem, |
|
1588 |
* we use the offset 2 for the '.zfs' directory. |
|
1589 |
*/ |
|
1590 |
/* ARGSUSED */ |
|
1591 |
static int |
|
1592 |
zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp) |
|
1593 |
{ |
|
1594 |
znode_t *zp = VTOZ(vp); |
|
1595 |
iovec_t *iovp; |
|
1596 |
dirent64_t *odp; |
|
1597 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
869
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1598 |
objset_t *os; |
789 | 1599 |
caddr_t outbuf; |
1600 |
size_t bufsize; |
|
1601 |
zap_cursor_t zc; |
|
1602 |
zap_attribute_t zap; |
|
1603 |
uint_t bytes_wanted; |
|
1604 |
ushort_t this_reclen; |
|
1605 |
uint64_t offset; /* must be unsigned; checks for < 1 */ |
|
1606 |
off64_t *next; |
|
1607 |
int local_eof; |
|
869
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1608 |
int outcount; |
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1609 |
int error; |
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1610 |
uint8_t prefetch; |
789 | 1611 |
|
1612 |
ZFS_ENTER(zfsvfs); |
|
1613 |
||
1614 |
/* |
|
1615 |
* If we are not given an eof variable, |
|
1616 |
* use a local one. |
|
1617 |
*/ |
|
1618 |
if (eofp == NULL) |
|
1619 |
eofp = &local_eof; |
|
1620 |
||
1621 |
/* |
|
1622 |
* Check for valid iov_len. |
|
1623 |
*/ |
|
1624 |
if (uio->uio_iov->iov_len <= 0) { |
|
1625 |
ZFS_EXIT(zfsvfs); |
|
1626 |
return (EINVAL); |
|
1627 |
} |
|
1628 |
||
1629 |
/* |
|
1630 |
* Quit if directory has been removed (posix) |
|
1631 |
*/ |
|
1632 |
if ((*eofp = zp->z_reap) != 0) { |
|
1633 |
ZFS_EXIT(zfsvfs); |
|
1634 |
return (0); |
|
1635 |
} |
|
1636 |
||
869
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1637 |
error = 0; |
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1638 |
os = zfsvfs->z_os; |
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1639 |
offset = uio->uio_loffset; |
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1640 |
prefetch = zp->z_zn_prefetch; |
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1641 |
|
789 | 1642 |
/* |
1643 |
* Initialize the iterator cursor. |
|
1644 |
*/ |
|
1645 |
if (offset <= 3) { |
|
1646 |
/* |
|
1647 |
* Start iteration from the beginning of the directory. |
|
1648 |
*/ |
|
869
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1649 |
zap_cursor_init(&zc, os, zp->z_id); |
789 | 1650 |
} else { |
1651 |
/* |
|
1652 |
* The offset is a serialized cursor. |
|
1653 |
*/ |
|
869
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1654 |
zap_cursor_init_serialized(&zc, os, zp->z_id, offset); |
789 | 1655 |
} |
1656 |
||
1657 |
/* |
|
1658 |
* Get space to change directory entries into fs independent format. |
|
1659 |
*/ |
|
1660 |
iovp = uio->uio_iov; |
|
1661 |
bytes_wanted = iovp->iov_len; |
|
1662 |
if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) { |
|
1663 |
bufsize = bytes_wanted; |
|
1664 |
outbuf = kmem_alloc(bufsize, KM_SLEEP); |
|
1665 |
odp = (struct dirent64 *)outbuf; |
|
1666 |
} else { |
|
1667 |
bufsize = bytes_wanted; |
|
1668 |
odp = (struct dirent64 *)iovp->iov_base; |
|
1669 |
} |
|
1670 |
||
1671 |
/* |
|
1672 |
* Transform to file-system independent format |
|
1673 |
*/ |
|
1674 |
outcount = 0; |
|
1675 |
while (outcount < bytes_wanted) { |
|
1676 |
/* |
|
1677 |
* Special case `.', `..', and `.zfs'. |
|
1678 |
*/ |
|
1679 |
if (offset == 0) { |
|
1680 |
(void) strcpy(zap.za_name, "."); |
|
1681 |
zap.za_first_integer = zp->z_id; |
|
1682 |
this_reclen = DIRENT64_RECLEN(1); |
|
1683 |
} else if (offset == 1) { |
|
1684 |
(void) strcpy(zap.za_name, ".."); |
|
1685 |
zap.za_first_integer = zp->z_phys->zp_parent; |
|
1686 |
this_reclen = DIRENT64_RECLEN(2); |
|
1687 |
} else if (offset == 2 && zfs_show_ctldir(zp)) { |
|
1688 |
(void) strcpy(zap.za_name, ZFS_CTLDIR_NAME); |
|
1689 |
zap.za_first_integer = ZFSCTL_INO_ROOT; |
|
1690 |
this_reclen = |
|
1691 |
DIRENT64_RECLEN(sizeof (ZFS_CTLDIR_NAME) - 1); |
|
1692 |
} else { |
|
1693 |
/* |
|
1694 |
* Grab next entry. |
|
1695 |
*/ |
|
1696 |
if (error = zap_cursor_retrieve(&zc, &zap)) { |
|
1697 |
if ((*eofp = (error == ENOENT)) != 0) |
|
1698 |
break; |
|
1699 |
else |
|
1700 |
goto update; |
|
1701 |
} |
|
1702 |
||
1703 |
if (zap.za_integer_length != 8 || |
|
1704 |
zap.za_num_integers != 1) { |
|
1705 |
cmn_err(CE_WARN, "zap_readdir: bad directory " |
|
1706 |
"entry, obj = %lld, offset = %lld\n", |
|
1707 |
(u_longlong_t)zp->z_id, |
|
1708 |
(u_longlong_t)offset); |
|
1709 |
error = ENXIO; |
|
1710 |
goto update; |
|
1711 |
} |
|
1712 |
this_reclen = DIRENT64_RECLEN(strlen(zap.za_name)); |
|
1713 |
} |
|
1714 |
||
1715 |
/* |
|
1716 |
* Will this entry fit in the buffer? |
|
1717 |
*/ |
|
1718 |
if (outcount + this_reclen > bufsize) { |
|
1719 |
/* |
|
1720 |
* Did we manage to fit anything in the buffer? |
|
1721 |
*/ |
|
1722 |
if (!outcount) { |
|
1723 |
error = EINVAL; |
|
1724 |
goto update; |
|
1725 |
} |
|
1726 |
break; |
|
1727 |
} |
|
1728 |
/* |
|
1729 |
* Add this entry: |
|
1730 |
*/ |
|
1731 |
odp->d_ino = (ino64_t)zap.za_first_integer; |
|
1732 |
odp->d_reclen = (ushort_t)this_reclen; |
|
1733 |
/* NOTE: d_off is the offset for the *next* entry */ |
|
1734 |
next = &(odp->d_off); |
|
1735 |
(void) strncpy(odp->d_name, zap.za_name, |
|
1736 |
DIRENT64_NAMELEN(this_reclen)); |
|
1737 |
outcount += this_reclen; |
|
1738 |
odp = (dirent64_t *)((intptr_t)odp + this_reclen); |
|
1739 |
||
1740 |
ASSERT(outcount <= bufsize); |
|
1741 |
||
1742 |
/* Prefetch znode */ |
|
869
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1743 |
if (prefetch) |
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1744 |
dmu_prefetch(os, zap.za_first_integer, 0, 0); |
789 | 1745 |
|
1746 |
/* |
|
1747 |
* Move to the next entry, fill in the previous offset. |
|
1748 |
*/ |
|
1749 |
if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) { |
|
1750 |
zap_cursor_advance(&zc); |
|
1751 |
offset = zap_cursor_serialize(&zc); |
|
1752 |
} else { |
|
1753 |
offset += 1; |
|
1754 |
} |
|
1755 |
*next = offset; |
|
1756 |
} |
|
869
dc133b87dfb3
6297285 znode prefetching in zfs_readdir causes 5x performance degradation for 'ls'
perrin
parents:
789
diff
changeset
|
1757 |
zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */ |
789 | 1758 |
|
1759 |
if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) { |
|
1760 |
iovp->iov_base += outcount; |
|
1761 |
iovp->iov_len -= outcount; |
|
1762 |
uio->uio_resid -= outcount; |
|
1763 |
} else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) { |
|
1764 |
/* |
|
1765 |
* Reset the pointer. |
|
1766 |
*/ |
|
1767 |
offset = uio->uio_loffset; |
|
1768 |
} |
|
1769 |
||
1770 |
update: |
|
885
d925b21dba78
6347493 tar of 25K empty directory entries in ZFS takes 30+ seconds ...
ahrens
parents:
869
diff
changeset
|
1771 |
zap_cursor_fini(&zc); |
789 | 1772 |
if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) |
1773 |
kmem_free(outbuf, bufsize); |
|
1774 |
||
1775 |
if (error == ENOENT) |
|
1776 |
error = 0; |
|
1777 |
||
1778 |
ZFS_ACCESSTIME_STAMP(zfsvfs, zp); |
|
1779 |
||
1780 |
uio->uio_loffset = offset; |
|
1781 |
ZFS_EXIT(zfsvfs); |
|
1782 |
return (error); |
|
1783 |
} |
|
1784 |
||
1785 |
/* ARGSUSED */ |
|
1786 |
static int |
|
1787 |
zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr) |
|
1788 |
{ |
|
1789 |
znode_t *zp = VTOZ(vp); |
|
1790 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
1791 |
||
1792 |
ZFS_ENTER(zfsvfs); |
|
1793 |
zil_commit(zfsvfs->z_log, zp->z_last_itx, FSYNC); |
|
1794 |
ZFS_EXIT(zfsvfs); |
|
1795 |
return (0); |
|
1796 |
} |
|
1797 |
||
1798 |
/* |
|
1799 |
* Get the requested file attributes and place them in the provided |
|
1800 |
* vattr structure. |
|
1801 |
* |
|
1802 |
* IN: vp - vnode of file. |
|
1803 |
* vap - va_mask identifies requested attributes. |
|
1804 |
* flags - [UNUSED] |
|
1805 |
* cr - credentials of caller. |
|
1806 |
* |
|
1807 |
* OUT: vap - attribute values. |
|
1808 |
* |
|
1809 |
* RETURN: 0 (always succeeds) |
|
1810 |
*/ |
|
1811 |
/* ARGSUSED */ |
|
1812 |
static int |
|
1813 |
zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) |
|
1814 |
{ |
|
1815 |
znode_t *zp = VTOZ(vp); |
|
1816 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
1817 |
znode_phys_t *pzp = zp->z_phys; |
|
1818 |
int error; |
|
1819 |
||
1820 |
ZFS_ENTER(zfsvfs); |
|
1821 |
||
1822 |
/* |
|
1823 |
* Return all attributes. It's cheaper to provide the answer |
|
1824 |
* than to determine whether we were asked the question. |
|
1825 |
*/ |
|
1826 |
mutex_enter(&zp->z_lock); |
|
1827 |
||
1828 |
vap->va_type = vp->v_type; |
|
1829 |
vap->va_mode = pzp->zp_mode & MODEMASK; |
|
1830 |
vap->va_uid = zp->z_phys->zp_uid; |
|
1831 |
vap->va_gid = zp->z_phys->zp_gid; |
|
1832 |
vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev; |
|
1833 |
vap->va_nodeid = zp->z_id; |
|
1834 |
vap->va_nlink = MIN(pzp->zp_links, UINT32_MAX); /* nlink_t limit! */ |
|
1835 |
vap->va_size = pzp->zp_size; |
|
1836 |
vap->va_rdev = pzp->zp_rdev; |
|
1837 |
vap->va_seq = zp->z_seq; |
|
1838 |
||
1839 |
ZFS_TIME_DECODE(&vap->va_atime, pzp->zp_atime); |
|
1840 |
ZFS_TIME_DECODE(&vap->va_mtime, pzp->zp_mtime); |
|
1841 |
ZFS_TIME_DECODE(&vap->va_ctime, pzp->zp_ctime); |
|
1842 |
||
1843 |
/* |
|
905
920e9b2e0899
6347134 zfs_zaccess() is killing ZFS stat() performance
marks
parents:
885
diff
changeset
|
1844 |
* If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES. |
920e9b2e0899
6347134 zfs_zaccess() is killing ZFS stat() performance
marks
parents:
885
diff
changeset
|
1845 |
* Also, if we are the owner don't bother, since owner should |
920e9b2e0899
6347134 zfs_zaccess() is killing ZFS stat() performance
marks
parents:
885
diff
changeset
|
1846 |
* always be allowed to read basic attributes of file. |
789 | 1847 |
*/ |
905
920e9b2e0899
6347134 zfs_zaccess() is killing ZFS stat() performance
marks
parents:
885
diff
changeset
|
1848 |
if (!(zp->z_phys->zp_flags & ZFS_ACL_TRIVIAL) && |
920e9b2e0899
6347134 zfs_zaccess() is killing ZFS stat() performance
marks
parents:
885
diff
changeset
|
1849 |
(zp->z_phys->zp_uid != crgetuid(cr))) { |
920e9b2e0899
6347134 zfs_zaccess() is killing ZFS stat() performance
marks
parents:
885
diff
changeset
|
1850 |
if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, cr)) { |
789 | 1851 |
mutex_exit(&zp->z_lock); |
1852 |
ZFS_EXIT(zfsvfs); |
|
1853 |
return (error); |
|
1854 |
} |
|
1855 |
} |
|
1856 |
||
1857 |
mutex_exit(&zp->z_lock); |
|
1858 |
||
1859 |
dmu_object_size_from_db(zp->z_dbuf, &vap->va_blksize, &vap->va_nblocks); |
|
1860 |
||
1861 |
if (zp->z_blksz == 0) { |
|
1862 |
/* |
|
1863 |
* Block size hasn't been set; suggest maximal I/O transfers. |
|
1864 |
*/ |
|
1865 |
vap->va_blksize = zfsvfs->z_max_blksz; |
|
1866 |
} |
|
1867 |
||
1868 |
ZFS_EXIT(zfsvfs); |
|
1869 |
return (0); |
|
1870 |
} |
|
1871 |
||
1872 |
/* |
|
1873 |
* Set the file attributes to the values contained in the |
|
1874 |
* vattr structure. |
|
1875 |
* |
|
1876 |
* IN: vp - vnode of file to be modified. |
|
1877 |
* vap - new attribute values. |
|
1878 |
* flags - ATTR_UTIME set if non-default time values provided. |
|
1879 |
* cr - credentials of caller. |
|
1880 |
* |
|
1881 |
* RETURN: 0 if success |
|
1882 |
* error code if failure |
|
1883 |
* |
|
1884 |
* Timestamps: |
|
1885 |
* vp - ctime updated, mtime updated if size changed. |
|
1886 |
*/ |
|
1887 |
/* ARGSUSED */ |
|
1888 |
static int |
|
1889 |
zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, |
|
1890 |
caller_context_t *ct) |
|
1891 |
{ |
|
1892 |
struct znode *zp = VTOZ(vp); |
|
1893 |
znode_phys_t *pzp = zp->z_phys; |
|
1894 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
1895 |
zilog_t *zilog = zfsvfs->z_log; |
|
1896 |
uint64_t seq = 0; |
|
1897 |
dmu_tx_t *tx; |
|
1898 |
uint_t mask = vap->va_mask; |
|
1899 |
uint_t mask_applied = 0; |
|
1900 |
vattr_t oldva; |
|
1115 | 1901 |
int trim_mask = FALSE; |
1902 |
int saved_mask; |
|
789 | 1903 |
uint64_t new_mode; |
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1904 |
znode_t *attrzp; |
789 | 1905 |
int have_grow_lock; |
1906 |
int need_policy = FALSE; |
|
1907 |
int err; |
|
1908 |
||
1909 |
if (mask == 0) |
|
1910 |
return (0); |
|
1911 |
||
1912 |
if (mask & AT_NOSET) |
|
1913 |
return (EINVAL); |
|
1914 |
||
1915 |
if (mask & AT_SIZE && vp->v_type == VDIR) |
|
1916 |
return (EISDIR); |
|
1917 |
||
1308
997e6a49c409
6362908 nfsv4-test: RENAME does not check PERM with NFSv4/ZFS
marks
parents:
1298
diff
changeset
|
1918 |
if (mask & AT_SIZE && vp->v_type != VREG) |
997e6a49c409
6362908 nfsv4-test: RENAME does not check PERM with NFSv4/ZFS
marks
parents:
1298
diff
changeset
|
1919 |
return (EINVAL); |
997e6a49c409
6362908 nfsv4-test: RENAME does not check PERM with NFSv4/ZFS
marks
parents:
1298
diff
changeset
|
1920 |
|
789 | 1921 |
ZFS_ENTER(zfsvfs); |
1922 |
||
1923 |
top: |
|
1924 |
have_grow_lock = FALSE; |
|
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
1925 |
attrzp = NULL; |
789 | 1926 |
|
1927 |
if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { |
|
1928 |
ZFS_EXIT(zfsvfs); |
|
1929 |
return (EROFS); |
|
1930 |
} |
|
1931 |
||
1932 |
/* |
|
1933 |
* First validate permissions |
|
1934 |
*/ |
|
1935 |
||
1936 |
if (mask & AT_SIZE) { |
|
1937 |
err = zfs_zaccess(zp, ACE_WRITE_DATA, cr); |
|
1938 |
if (err) { |
|
1939 |
ZFS_EXIT(zfsvfs); |
|
1940 |
return (err); |
|
1941 |
} |
|
1942 |
} |
|
1943 |
||
1944 |
if (mask & (AT_ATIME|AT_MTIME)) |
|
1945 |
need_policy = zfs_zaccess_v4_perm(zp, ACE_WRITE_ATTRIBUTES, cr); |
|
1946 |
||
1947 |
if (mask & (AT_UID|AT_GID)) { |
|
1948 |
int idmask = (mask & (AT_UID|AT_GID)); |
|
1949 |
int take_owner; |
|
1950 |
int take_group; |
|
1951 |
||
1952 |
/* |
|
913
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1953 |
* NOTE: even if a new mode is being set, |
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1954 |
* we may clear S_ISUID/S_ISGID bits. |
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1955 |
*/ |
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1956 |
|
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1957 |
if (!(mask & AT_MODE)) |
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1958 |
vap->va_mode = pzp->zp_mode; |
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1959 |
|
e99aef503251
6299353 chown(2) fails to clear SUID/SGID bits on ZFS.
marks
parents:
905
diff
changeset
|
1960 |
/* |
789 | 1961 |
* Take ownership or chgrp to group we are a member of |
1962 |
*/ |
|
1963 |
||
1964 |
take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr)); |
|
1965 |
take_group = (mask & AT_GID) && groupmember(vap->va_gid, cr); |
|
1966 |
||
1967 |
/* |
|
1968 |
* If both AT_UID and AT_GID are set then take_owner and |
|
1969 |
* take_group must both be set in order to allow taking |
|
1970 |
* ownership. |
|
1971 |
* |
|
1972 |
* Otherwise, send the check through secpolicy_vnode_setattr() |
|
1973 |
* |
|
1974 |
*/ |
|
1975 |
||
1976 |
if (((idmask == (AT_UID|AT_GID)) && take_owner && take_group) || |
|
1977 |
((idmask == AT_UID) && take_owner) || |
|
1978 |
((idmask == AT_GID) && take_group)) { |
|
1979 |
if (zfs_zaccess_v4_perm(zp, ACE_WRITE_OWNER, cr) == 0) { |
|
1980 |
/* |
|
1981 |
* Remove setuid/setgid for non-privileged users |
|
1982 |
*/ |
|
1115 | 1983 |
secpolicy_setid_clear(vap, cr); |
1984 |
trim_mask = TRUE; |
|
1985 |
saved_mask = vap->va_mask; |
|
789 | 1986 |
} else { |
1987 |
need_policy = TRUE; |
|
1988 |
} |
|
1989 |
} else { |
|
1990 |
need_policy = TRUE; |
|
1991 |
} |
|
1992 |
} |
|
1993 |
||
1994 |
if (mask & AT_MODE) |
|
1995 |
need_policy = TRUE; |
|
1996 |
||
1997 |
if (need_policy) { |
|
1998 |
mutex_enter(&zp->z_lock); |
|
1999 |
oldva.va_mode = pzp->zp_mode; |
|
2000 |
oldva.va_uid = zp->z_phys->zp_uid; |
|
2001 |
oldva.va_gid = zp->z_phys->zp_gid; |
|
2002 |
mutex_exit(&zp->z_lock); |
|
1115 | 2003 |
|
2004 |
/* |
|
2005 |
* If trim_mask is set then take ownership |
|
2006 |
* has been granted. In that case remove |
|
2007 |
* UID|GID from mask so that |
|
2008 |
* secpolicy_vnode_setattr() doesn't revoke it. |
|
2009 |
*/ |
|
2010 |
if (trim_mask) |
|
2011 |
vap->va_mask &= ~(AT_UID|AT_GID); |
|
2012 |
||
789 | 2013 |
err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags, |
2014 |
(int (*)(void *, int, cred_t *))zfs_zaccess_rwx, zp); |
|
2015 |
if (err) { |
|
2016 |
ZFS_EXIT(zfsvfs); |
|
2017 |
return (err); |
|
2018 |
} |
|
1115 | 2019 |
|
2020 |
if (trim_mask) |
|
2021 |
vap->va_mask |= (saved_mask & (AT_UID|AT_GID)); |
|
789 | 2022 |
} |
2023 |
||
2024 |
/* |
|
2025 |
* secpolicy_vnode_setattr, or take ownership may have |
|
2026 |
* changed va_mask |
|
2027 |
*/ |
|
2028 |
mask = vap->va_mask; |
|
2029 |
||
2030 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
2031 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
2032 |
||
2033 |
if (mask & AT_MODE) { |
|
2034 |
||
2035 |
new_mode = (pzp->zp_mode & S_IFMT) | (vap->va_mode & ~S_IFMT); |
|
2036 |
||
2037 |
if (zp->z_phys->zp_acl.z_acl_extern_obj) |
|
2038 |
dmu_tx_hold_write(tx, |
|
2039 |
pzp->zp_acl.z_acl_extern_obj, 0, SPA_MAXBLOCKSIZE); |
|
2040 |
else |
|
2041 |
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, |
|
2042 |
0, ZFS_ACL_SIZE(MAX_ACL_SIZE)); |
|
2043 |
} |
|
2044 |
||
2045 |
if (mask & AT_SIZE) { |
|
2046 |
uint64_t off = vap->va_size; |
|
2047 |
/* |
|
2048 |
* Grab the grow_lock to serialize this change with |
|
2049 |
* respect to other file manipulations. |
|
2050 |
*/ |
|
2051 |
rw_enter(&zp->z_grow_lock, RW_WRITER); |
|
2052 |
have_grow_lock = TRUE; |
|
2053 |
if (off < zp->z_phys->zp_size) |
|
2054 |
dmu_tx_hold_free(tx, zp->z_id, off, DMU_OBJECT_END); |
|
2055 |
else if (zp->z_phys->zp_size && |
|
2056 |
zp->z_blksz < zfsvfs->z_max_blksz && off > zp->z_blksz) |
|
2057 |
/* we will rewrite this block if we grow */ |
|
2058 |
dmu_tx_hold_write(tx, zp->z_id, 0, zp->z_phys->zp_size); |
|
2059 |
} |
|
2060 |
||
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2061 |
if ((mask & (AT_UID | AT_GID)) && zp->z_phys->zp_xattr != 0) { |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2062 |
err = zfs_zget(zp->z_zfsvfs, zp->z_phys->zp_xattr, &attrzp); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2063 |
if (err) { |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2064 |
dmu_tx_abort(tx); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2065 |
if (have_grow_lock) |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2066 |
rw_exit(&zp->z_grow_lock); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2067 |
ZFS_EXIT(zfsvfs); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2068 |
return (err); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2069 |
} |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2070 |
dmu_tx_hold_bonus(tx, attrzp->z_id); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2071 |
} |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2072 |
|
789 | 2073 |
err = dmu_tx_assign(tx, zfsvfs->z_assign); |
2074 |
if (err) { |
|
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2075 |
if (attrzp) |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2076 |
VN_RELE(ZTOV(attrzp)); |
789 | 2077 |
dmu_tx_abort(tx); |
2078 |
if (have_grow_lock) |
|
2079 |
rw_exit(&zp->z_grow_lock); |
|
2080 |
if (err == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
2081 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
2082 |
goto top; |
|
2083 |
} |
|
2084 |
ZFS_EXIT(zfsvfs); |
|
2085 |
return (err); |
|
2086 |
} |
|
2087 |
||
2088 |
dmu_buf_will_dirty(zp->z_dbuf, tx); |
|
2089 |
||
2090 |
/* |
|
2091 |
* Set each attribute requested. |
|
2092 |
* We group settings according to the locks they need to acquire. |
|
2093 |
* |
|
2094 |
* Note: you cannot set ctime directly, although it will be |
|
2095 |
* updated as a side-effect of calling this function. |
|
2096 |
*/ |
|
2097 |
if (mask & AT_SIZE) { |
|
2098 |
/* |
|
2099 |
* XXX - Note, we are not providing any open |
|
2100 |
* mode flags here (like FNDELAY), so we may |
|
2101 |
* block if there are locks present... this |
|
2102 |
* should be addressed in openat(). |
|
2103 |
*/ |
|
2104 |
err = zfs_freesp(zp, vap->va_size, 0, 0, tx, cr); |
|
2105 |
if (err) { |
|
2106 |
mutex_enter(&zp->z_lock); |
|
2107 |
goto out; |
|
2108 |
} |
|
2109 |
mask_applied |= AT_SIZE; |
|
2110 |
} |
|
2111 |
||
2112 |
mask_applied = mask; /* no errors after this point */ |
|
2113 |
||
2114 |
mutex_enter(&zp->z_lock); |
|
2115 |
||
2116 |
if (mask & AT_MODE) { |
|
2117 |
err = zfs_acl_chmod_setattr(zp, new_mode, tx); |
|
2118 |
ASSERT3U(err, ==, 0); |
|
2119 |
} |
|
2120 |
||
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2121 |
if (attrzp) |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2122 |
mutex_enter(&attrzp->z_lock); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2123 |
|
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2124 |
if (mask & AT_UID) { |
789 | 2125 |
zp->z_phys->zp_uid = (uint64_t)vap->va_uid; |
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2126 |
if (attrzp) { |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2127 |
attrzp->z_phys->zp_uid = (uint64_t)vap->va_uid; |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2128 |
} |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2129 |
} |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2130 |
|
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2131 |
if (mask & AT_GID) { |
789 | 2132 |
zp->z_phys->zp_gid = (uint64_t)vap->va_gid; |
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2133 |
if (attrzp) |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2134 |
attrzp->z_phys->zp_gid = (uint64_t)vap->va_gid; |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2135 |
} |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2136 |
|
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2137 |
if (attrzp) |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2138 |
mutex_exit(&attrzp->z_lock); |
789 | 2139 |
|
2140 |
if (mask & AT_ATIME) |
|
2141 |
ZFS_TIME_ENCODE(&vap->va_atime, pzp->zp_atime); |
|
2142 |
||
2143 |
if (mask & AT_MTIME) |
|
2144 |
ZFS_TIME_ENCODE(&vap->va_mtime, pzp->zp_mtime); |
|
2145 |
||
2146 |
if (mask_applied & AT_SIZE) |
|
2147 |
zfs_time_stamper_locked(zp, CONTENT_MODIFIED, tx); |
|
2148 |
else if (mask_applied != 0) |
|
2149 |
zfs_time_stamper_locked(zp, STATE_CHANGED, tx); |
|
2150 |
||
2151 |
out: |
|
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2152 |
|
789 | 2153 |
if (mask_applied != 0) |
2154 |
seq = zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, |
|
2155 |
mask_applied); |
|
2156 |
||
2157 |
mutex_exit(&zp->z_lock); |
|
2158 |
||
1231
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2159 |
if (attrzp) |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2160 |
VN_RELE(ZTOV(attrzp)); |
64215f768e86
6354804 The file's ACL was changed when cp it from one ZFS file system to another one.
marks
parents:
1141
diff
changeset
|
2161 |
|
789 | 2162 |
if (have_grow_lock) |
2163 |
rw_exit(&zp->z_grow_lock); |
|
2164 |
||
2165 |
dmu_tx_commit(tx); |
|
2166 |
||
2167 |
zil_commit(zilog, seq, 0); |
|
2168 |
||
2169 |
ZFS_EXIT(zfsvfs); |
|
2170 |
return (err); |
|
2171 |
} |
|
2172 |
||
2173 |
/* |
|
2174 |
* Search back through the directory tree, using the ".." entries. |
|
2175 |
* Lock each directory in the chain to prevent concurrent renames. |
|
2176 |
* Fail any attempt to move a directory into one of its own descendants. |
|
2177 |
* XXX - z_parent_lock can overlap with map or grow locks |
|
2178 |
*/ |
|
2179 |
typedef struct zfs_zlock { |
|
2180 |
krwlock_t *zl_rwlock; /* lock we acquired */ |
|
2181 |
znode_t *zl_znode; /* znode we held */ |
|
2182 |
struct zfs_zlock *zl_next; /* next in list */ |
|
2183 |
} zfs_zlock_t; |
|
2184 |
||
2185 |
static int |
|
2186 |
zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp) |
|
2187 |
{ |
|
2188 |
zfs_zlock_t *zl; |
|
2189 |
znode_t *zp = tdzp; |
|
2190 |
uint64_t rootid = zp->z_zfsvfs->z_root; |
|
2191 |
uint64_t *oidp = &zp->z_id; |
|
2192 |
krwlock_t *rwlp = &szp->z_parent_lock; |
|
2193 |
krw_t rw = RW_WRITER; |
|
2194 |
||
2195 |
/* |
|
2196 |
* First pass write-locks szp and compares to zp->z_id. |
|
2197 |
* Later passes read-lock zp and compare to zp->z_parent. |
|
2198 |
*/ |
|
2199 |
do { |
|
2200 |
zl = kmem_alloc(sizeof (*zl), KM_SLEEP); |
|
2201 |
zl->zl_rwlock = rwlp; |
|
2202 |
zl->zl_znode = NULL; |
|
2203 |
zl->zl_next = *zlpp; |
|
2204 |
*zlpp = zl; |
|
2205 |
||
2206 |
rw_enter(rwlp, rw); |
|
2207 |
||
2208 |
if (*oidp == szp->z_id) /* We're a descendant of szp */ |
|
2209 |
return (EINVAL); |
|
2210 |
||
2211 |
if (*oidp == rootid) /* We've hit the top */ |
|
2212 |
return (0); |
|
2213 |
||
2214 |
if (rw == RW_READER) { /* i.e. not the first pass */ |
|
2215 |
int error = zfs_zget(zp->z_zfsvfs, *oidp, &zp); |
|
2216 |
if (error) |
|
2217 |
return (error); |
|
2218 |
zl->zl_znode = zp; |
|
2219 |
} |
|
2220 |
oidp = &zp->z_phys->zp_parent; |
|
2221 |
rwlp = &zp->z_parent_lock; |
|
2222 |
rw = RW_READER; |
|
2223 |
||
2224 |
} while (zp->z_id != sdzp->z_id); |
|
2225 |
||
2226 |
return (0); |
|
2227 |
} |
|
2228 |
||
2229 |
/* |
|
2230 |
* Drop locks and release vnodes that were held by zfs_rename_lock(). |
|
2231 |
*/ |
|
2232 |
static void |
|
2233 |
zfs_rename_unlock(zfs_zlock_t **zlpp) |
|
2234 |
{ |
|
2235 |
zfs_zlock_t *zl; |
|
2236 |
||
2237 |
while ((zl = *zlpp) != NULL) { |
|
2238 |
if (zl->zl_znode != NULL) |
|
2239 |
VN_RELE(ZTOV(zl->zl_znode)); |
|
2240 |
rw_exit(zl->zl_rwlock); |
|
2241 |
*zlpp = zl->zl_next; |
|
2242 |
kmem_free(zl, sizeof (*zl)); |
|
2243 |
} |
|
2244 |
} |
|
2245 |
||
2246 |
/* |
|
2247 |
* Move an entry from the provided source directory to the target |
|
2248 |
* directory. Change the entry name as indicated. |
|
2249 |
* |
|
2250 |
* IN: sdvp - Source directory containing the "old entry". |
|
2251 |
* snm - Old entry name. |
|
2252 |
* tdvp - Target directory to contain the "new entry". |
|
2253 |
* tnm - New entry name. |
|
2254 |
* cr - credentials of caller. |
|
2255 |
* |
|
2256 |
* RETURN: 0 if success |
|
2257 |
* error code if failure |
|
2258 |
* |
|
2259 |
* Timestamps: |
|
2260 |
* sdvp,tdvp - ctime|mtime updated |
|
2261 |
*/ |
|
2262 |
static int |
|
2263 |
zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr) |
|
2264 |
{ |
|
2265 |
znode_t *tdzp, *szp, *tzp; |
|
2266 |
znode_t *sdzp = VTOZ(sdvp); |
|
2267 |
zfsvfs_t *zfsvfs = sdzp->z_zfsvfs; |
|
2268 |
zilog_t *zilog = zfsvfs->z_log; |
|
2269 |
uint64_t seq = 0; |
|
2270 |
vnode_t *realvp; |
|
2271 |
zfs_dirlock_t *sdl, *tdl; |
|
2272 |
dmu_tx_t *tx; |
|
2273 |
zfs_zlock_t *zl; |
|
2274 |
int cmp, serr, terr, error; |
|
2275 |
||
2276 |
ZFS_ENTER(zfsvfs); |
|
2277 |
||
2278 |
/* |
|
2279 |
* Make sure we have the real vp for the target directory. |
|
2280 |
*/ |
|
2281 |
if (VOP_REALVP(tdvp, &realvp) == 0) |
|
2282 |
tdvp = realvp; |
|
2283 |
||
2284 |
if (tdvp->v_vfsp != sdvp->v_vfsp) { |
|
2285 |
ZFS_EXIT(zfsvfs); |
|
2286 |
return (EXDEV); |
|
2287 |
} |
|
2288 |
||
2289 |
tdzp = VTOZ(tdvp); |
|
2290 |
top: |
|
2291 |
szp = NULL; |
|
2292 |
tzp = NULL; |
|
2293 |
zl = NULL; |
|
2294 |
||
2295 |
/* |
|
2296 |
* This is to prevent the creation of links into attribute space |
|
2297 |
* by renaming a linked file into/outof an attribute directory. |
|
2298 |
* See the comment in zfs_link() for why this is considered bad. |
|
2299 |
*/ |
|
2300 |
if ((tdzp->z_phys->zp_flags & ZFS_XATTR) != |
|
2301 |
(sdzp->z_phys->zp_flags & ZFS_XATTR)) { |
|
2302 |
ZFS_EXIT(zfsvfs); |
|
2303 |
return (EINVAL); |
|
2304 |
} |
|
2305 |
||
2306 |
/* |
|
2307 |
* Lock source and target directory entries. To prevent deadlock, |
|
2308 |
* a lock ordering must be defined. We lock the directory with |
|
2309 |
* the smallest object id first, or if it's a tie, the one with |
|
2310 |
* the lexically first name. |
|
2311 |
*/ |
|
2312 |
if (sdzp->z_id < tdzp->z_id) { |
|
2313 |
cmp = -1; |
|
2314 |
} else if (sdzp->z_id > tdzp->z_id) { |
|
2315 |
cmp = 1; |
|
2316 |
} else { |
|
2317 |
cmp = strcmp(snm, tnm); |
|
2318 |
if (cmp == 0) { |
|
2319 |
/* |
|
2320 |
* POSIX: "If the old argument and the new argument |
|
2321 |
* both refer to links to the same existing file, |
|
2322 |
* the rename() function shall return successfully |
|
2323 |
* and perform no other action." |
|
2324 |
*/ |
|
2325 |
ZFS_EXIT(zfsvfs); |
|
2326 |
return (0); |
|
2327 |
} |
|
2328 |
} |
|
2329 |
if (cmp < 0) { |
|
2330 |
serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp, ZEXISTS); |
|
2331 |
terr = zfs_dirent_lock(&tdl, tdzp, tnm, &tzp, 0); |
|
2332 |
} else { |
|
2333 |
terr = zfs_dirent_lock(&tdl, tdzp, tnm, &tzp, 0); |
|
2334 |
serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp, ZEXISTS); |
|
2335 |
} |
|
2336 |
||
2337 |
if (serr) { |
|
2338 |
/* |
|
2339 |
* Source entry invalid or not there. |
|
2340 |
*/ |
|
2341 |
if (!terr) { |
|
2342 |
zfs_dirent_unlock(tdl); |
|
2343 |
if (tzp) |
|
2344 |
VN_RELE(ZTOV(tzp)); |
|
2345 |
} |
|
2346 |
if (strcmp(snm, "..") == 0) |
|
2347 |
serr = EINVAL; |
|
2348 |
ZFS_EXIT(zfsvfs); |
|
2349 |
return (serr); |
|
2350 |
} |
|
2351 |
if (terr) { |
|
2352 |
zfs_dirent_unlock(sdl); |
|
2353 |
VN_RELE(ZTOV(szp)); |
|
2354 |
if (strcmp(tnm, "..") == 0) |
|
2355 |
terr = EINVAL; |
|
2356 |
ZFS_EXIT(zfsvfs); |
|
2357 |
return (terr); |
|
2358 |
} |
|
2359 |
||
2360 |
/* |
|
2361 |
* Must have write access at the source to remove the old entry |
|
2362 |
* and write access at the target to create the new entry. |
|
2363 |
* Note that if target and source are the same, this can be |
|
2364 |
* done in a single check. |
|
2365 |
*/ |
|
2366 |
||
2367 |
if (error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)) |
|
2368 |
goto out; |
|
2369 |
||
2370 |
if (ZTOV(szp)->v_type == VDIR) { |
|
2371 |
/* |
|
2372 |
* Check to make sure rename is valid. |
|
2373 |
* Can't do a move like this: /usr/a/b to /usr/a/b/c/d |
|
2374 |
*/ |
|
2375 |
if (error = zfs_rename_lock(szp, tdzp, sdzp, &zl)) |
|
2376 |
goto out; |
|
2377 |
} |
|
2378 |
||
2379 |
/* |
|
2380 |
* Does target exist? |
|
2381 |
*/ |
|
2382 |
if (tzp) { |
|
2383 |
/* |
|
2384 |
* Source and target must be the same type. |
|
2385 |
*/ |
|
2386 |
if (ZTOV(szp)->v_type == VDIR) { |
|
2387 |
if (ZTOV(tzp)->v_type != VDIR) { |
|
2388 |
error = ENOTDIR; |
|
2389 |
goto out; |
|
2390 |
} |
|
2391 |
} else { |
|
2392 |
if (ZTOV(tzp)->v_type == VDIR) { |
|
2393 |
error = EISDIR; |
|
2394 |
goto out; |
|
2395 |
} |
|
2396 |
} |
|
2397 |
/* |
|
2398 |
* POSIX dictates that when the source and target |
|
2399 |
* entries refer to the same file object, rename |
|
2400 |
* must do nothing and exit without error. |
|
2401 |
*/ |
|
2402 |
if (szp->z_id == tzp->z_id) { |
|
2403 |
error = 0; |
|
2404 |
goto out; |
|
2405 |
} |
|
2406 |
} |
|
2407 |
||
2408 |
vnevent_rename_src(ZTOV(szp)); |
|
2409 |
if (tzp) |
|
2410 |
vnevent_rename_dest(ZTOV(tzp)); |
|
2411 |
||
2412 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
2413 |
dmu_tx_hold_bonus(tx, szp->z_id); /* nlink changes */ |
|
2414 |
dmu_tx_hold_bonus(tx, sdzp->z_id); /* nlink changes */ |
|
2415 |
if (sdzp != tdzp) { |
|
2416 |
dmu_tx_hold_zap(tx, sdzp->z_id, 1); |
|
2417 |
dmu_tx_hold_zap(tx, tdzp->z_id, 1); |
|
2418 |
dmu_tx_hold_bonus(tx, tdzp->z_id); /* nlink changes */ |
|
2419 |
} else { |
|
2420 |
dmu_tx_hold_zap(tx, sdzp->z_id, 2); |
|
2421 |
} |
|
2422 |
if (tzp) { |
|
2423 |
dmu_tx_hold_bonus(tx, tzp->z_id); /* nlink changes */ |
|
2424 |
} |
|
2425 |
dmu_tx_hold_zap(tx, zfsvfs->z_dqueue, 1); |
|
2426 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
2427 |
if (error) { |
|
2428 |
dmu_tx_abort(tx); |
|
2429 |
if (zl != NULL) |
|
2430 |
zfs_rename_unlock(&zl); |
|
2431 |
zfs_dirent_unlock(sdl); |
|
2432 |
zfs_dirent_unlock(tdl); |
|
2433 |
VN_RELE(ZTOV(szp)); |
|
2434 |
if (tzp) |
|
2435 |
VN_RELE(ZTOV(tzp)); |
|
2436 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
2437 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
2438 |
goto top; |
|
2439 |
} |
|
2440 |
ZFS_EXIT(zfsvfs); |
|
2441 |
return (error); |
|
2442 |
} |
|
2443 |
||
2444 |
if (tzp) /* Attempt to remove the existing target */ |
|
2445 |
error = zfs_link_destroy(tdl, tzp, tx, 0, NULL); |
|
2446 |
||
2447 |
if (error == 0) { |
|
2448 |
error = zfs_link_create(tdl, szp, tx, ZRENAMING); |
|
2449 |
if (error == 0) { |
|
2450 |
error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL); |
|
2451 |
ASSERT(error == 0); |
|
2452 |
seq = zfs_log_rename(zilog, tx, TX_RENAME, |
|
2453 |
sdzp, sdl->dl_name, tdzp, tdl->dl_name, szp); |
|
2454 |
} |
|
2455 |
} |
|
2456 |
||
2457 |
dmu_tx_commit(tx); |
|
2458 |
out: |
|
2459 |
if (zl != NULL) |
|
2460 |
zfs_rename_unlock(&zl); |
|
2461 |
||
2462 |
zfs_dirent_unlock(sdl); |
|
2463 |
zfs_dirent_unlock(tdl); |
|
2464 |
||
2465 |
VN_RELE(ZTOV(szp)); |
|
2466 |
if (tzp) |
|
2467 |
VN_RELE(ZTOV(tzp)); |
|
2468 |
||
2469 |
zil_commit(zilog, seq, 0); |
|
2470 |
||
2471 |
ZFS_EXIT(zfsvfs); |
|
2472 |
return (error); |
|
2473 |
} |
|
2474 |
||
2475 |
/* |
|
2476 |
* Insert the indicated symbolic reference entry into the directory. |
|
2477 |
* |
|
2478 |
* IN: dvp - Directory to contain new symbolic link. |
|
2479 |
* link - Name for new symlink entry. |
|
2480 |
* vap - Attributes of new entry. |
|
2481 |
* target - Target path of new symlink. |
|
2482 |
* cr - credentials of caller. |
|
2483 |
* |
|
2484 |
* RETURN: 0 if success |
|
2485 |
* error code if failure |
|
2486 |
* |
|
2487 |
* Timestamps: |
|
2488 |
* dvp - ctime|mtime updated |
|
2489 |
*/ |
|
2490 |
static int |
|
2491 |
zfs_symlink(vnode_t *dvp, char *name, vattr_t *vap, char *link, cred_t *cr) |
|
2492 |
{ |
|
2493 |
znode_t *zp, *dzp = VTOZ(dvp); |
|
2494 |
zfs_dirlock_t *dl; |
|
2495 |
dmu_tx_t *tx; |
|
2496 |
zfsvfs_t *zfsvfs = dzp->z_zfsvfs; |
|
2497 |
zilog_t *zilog = zfsvfs->z_log; |
|
2498 |
uint64_t seq = 0; |
|
2499 |
uint64_t zoid; |
|
2500 |
int len = strlen(link); |
|
2501 |
int error; |
|
2502 |
||
2503 |
ASSERT(vap->va_type == VLNK); |
|
2504 |
||
2505 |
ZFS_ENTER(zfsvfs); |
|
2506 |
top: |
|
2507 |
if (error = zfs_zaccess(dzp, ACE_ADD_FILE, cr)) { |
|
2508 |
ZFS_EXIT(zfsvfs); |
|
2509 |
return (error); |
|
2510 |
} |
|
2511 |
||
2512 |
if (len > MAXPATHLEN) { |
|
2513 |
ZFS_EXIT(zfsvfs); |
|
2514 |
return (ENAMETOOLONG); |
|
2515 |
} |
|
2516 |
||
2517 |
/* |
|
2518 |
* Attempt to lock directory; fail if entry already exists. |
|
2519 |
*/ |
|
2520 |
if (error = zfs_dirent_lock(&dl, dzp, name, &zp, ZNEW)) { |
|
2521 |
ZFS_EXIT(zfsvfs); |
|
2522 |
return (error); |
|
2523 |
} |
|
2524 |
||
2525 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
2526 |
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len)); |
|
2527 |
dmu_tx_hold_bonus(tx, dzp->z_id); |
|
2528 |
dmu_tx_hold_zap(tx, dzp->z_id, 1); |
|
2529 |
if (dzp->z_phys->zp_flags & ZFS_INHERIT_ACE) |
|
2530 |
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, SPA_MAXBLOCKSIZE); |
|
2531 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
2532 |
if (error) { |
|
2533 |
dmu_tx_abort(tx); |
|
2534 |
zfs_dirent_unlock(dl); |
|
2535 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
2536 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
2537 |
goto top; |
|
2538 |
} |
|
2539 |
ZFS_EXIT(zfsvfs); |
|
2540 |
return (error); |
|
2541 |
} |
|
2542 |
||
2543 |
dmu_buf_will_dirty(dzp->z_dbuf, tx); |
|
2544 |
||
2545 |
/* |
|
2546 |
* Create a new object for the symlink. |
|
2547 |
* Put the link content into bonus buffer if it will fit; |
|
2548 |
* otherwise, store it just like any other file data. |
|
2549 |
*/ |
|
2550 |
zoid = 0; |
|
2551 |
if (sizeof (znode_phys_t) + len <= dmu_bonus_max()) { |
|
2552 |
zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, len); |
|
2553 |
if (len != 0) |
|
2554 |
bcopy(link, zp->z_phys + 1, len); |
|
2555 |
} else { |
|
2556 |
dmu_buf_t *dbp; |
|
2557 |
zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, 0); |
|
2558 |
||
2559 |
rw_enter(&zp->z_grow_lock, RW_WRITER); |
|
2560 |
error = zfs_grow_blocksize(zp, len, tx); |
|
2561 |
rw_exit(&zp->z_grow_lock); |
|
2562 |
if (error) |
|
2563 |
goto out; |
|
2564 |
||
2565 |
dbp = dmu_buf_hold(zfsvfs->z_os, zoid, 0); |
|
2566 |
dmu_buf_will_dirty(dbp, tx); |
|
2567 |
||
2568 |
ASSERT3U(len, <=, dbp->db_size); |
|
2569 |
bcopy(link, dbp->db_data, len); |
|
2570 |
dmu_buf_rele(dbp); |
|
2571 |
} |
|
2572 |
zp->z_phys->zp_size = len; |
|
2573 |
||
2574 |
/* |
|
2575 |
* Insert the new object into the directory. |
|
2576 |
*/ |
|
2577 |
(void) zfs_link_create(dl, zp, tx, ZNEW); |
|
2578 |
out: |
|
2579 |
if (error == 0) |
|
2580 |
seq = zfs_log_symlink(zilog, tx, TX_SYMLINK, |
|
2581 |
dzp, zp, name, link); |
|
2582 |
||
2583 |
dmu_tx_commit(tx); |
|
2584 |
||
2585 |
zfs_dirent_unlock(dl); |
|
2586 |
||
2587 |
VN_RELE(ZTOV(zp)); |
|
2588 |
||
2589 |
zil_commit(zilog, seq, 0); |
|
2590 |
||
2591 |
ZFS_EXIT(zfsvfs); |
|
2592 |
return (error); |
|
2593 |
} |
|
2594 |
||
2595 |
/* |
|
2596 |
* Return, in the buffer contained in the provided uio structure, |
|
2597 |
* the symbolic path referred to by vp. |
|
2598 |
* |
|
2599 |
* IN: vp - vnode of symbolic link. |
|
2600 |
* uoip - structure to contain the link path. |
|
2601 |
* cr - credentials of caller. |
|
2602 |
* |
|
2603 |
* OUT: uio - structure to contain the link path. |
|
2604 |
* |
|
2605 |
* RETURN: 0 if success |
|
2606 |
* error code if failure |
|
2607 |
* |
|
2608 |
* Timestamps: |
|
2609 |
* vp - atime updated |
|
2610 |
*/ |
|
2611 |
/* ARGSUSED */ |
|
2612 |
static int |
|
2613 |
zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr) |
|
2614 |
{ |
|
2615 |
znode_t *zp = VTOZ(vp); |
|
2616 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
2617 |
size_t bufsz; |
|
2618 |
int error; |
|
2619 |
||
2620 |
ZFS_ENTER(zfsvfs); |
|
2621 |
||
2622 |
bufsz = (size_t)zp->z_phys->zp_size; |
|
2623 |
if (bufsz + sizeof (znode_phys_t) <= zp->z_dbuf->db_size) { |
|
2624 |
error = uiomove(zp->z_phys + 1, |
|
2625 |
MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio); |
|
2626 |
} else { |
|
2627 |
dmu_buf_t *dbp = dmu_buf_hold(zfsvfs->z_os, zp->z_id, 0); |
|
2628 |
if ((error = dmu_buf_read_canfail(dbp)) != 0) { |
|
2629 |
dmu_buf_rele(dbp); |
|
2630 |
ZFS_EXIT(zfsvfs); |
|
2631 |
return (error); |
|
2632 |
} |
|
2633 |
error = uiomove(dbp->db_data, |
|
2634 |
MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio); |
|
2635 |
dmu_buf_rele(dbp); |
|
2636 |
} |
|
2637 |
||
2638 |
ZFS_ACCESSTIME_STAMP(zfsvfs, zp); |
|
2639 |
ZFS_EXIT(zfsvfs); |
|
2640 |
return (error); |
|
2641 |
} |
|
2642 |
||
2643 |
/* |
|
2644 |
* Insert a new entry into directory tdvp referencing svp. |
|
2645 |
* |
|
2646 |
* IN: tdvp - Directory to contain new entry. |
|
2647 |
* svp - vnode of new entry. |
|
2648 |
* name - name of new entry. |
|
2649 |
* cr - credentials of caller. |
|
2650 |
* |
|
2651 |
* RETURN: 0 if success |
|
2652 |
* error code if failure |
|
2653 |
* |
|
2654 |
* Timestamps: |
|
2655 |
* tdvp - ctime|mtime updated |
|
2656 |
* svp - ctime updated |
|
2657 |
*/ |
|
2658 |
/* ARGSUSED */ |
|
2659 |
static int |
|
2660 |
zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr) |
|
2661 |
{ |
|
2662 |
znode_t *dzp = VTOZ(tdvp); |
|
2663 |
znode_t *tzp, *szp; |
|
2664 |
zfsvfs_t *zfsvfs = dzp->z_zfsvfs; |
|
2665 |
zilog_t *zilog = zfsvfs->z_log; |
|
2666 |
uint64_t seq = 0; |
|
2667 |
zfs_dirlock_t *dl; |
|
2668 |
dmu_tx_t *tx; |
|
2669 |
vnode_t *realvp; |
|
2670 |
int error; |
|
2671 |
||
2672 |
ASSERT(tdvp->v_type == VDIR); |
|
2673 |
||
2674 |
ZFS_ENTER(zfsvfs); |
|
2675 |
||
2676 |
if (VOP_REALVP(svp, &realvp) == 0) |
|
2677 |
svp = realvp; |
|
2678 |
||
2679 |
if (svp->v_vfsp != tdvp->v_vfsp) { |
|
2680 |
ZFS_EXIT(zfsvfs); |
|
2681 |
return (EXDEV); |
|
2682 |
} |
|
2683 |
||
2684 |
szp = VTOZ(svp); |
|
2685 |
top: |
|
2686 |
/* |
|
2687 |
* We do not support links between attributes and non-attributes |
|
2688 |
* because of the potential security risk of creating links |
|
2689 |
* into "normal" file space in order to circumvent restrictions |
|
2690 |
* imposed in attribute space. |
|
2691 |
*/ |
|
2692 |
if ((szp->z_phys->zp_flags & ZFS_XATTR) != |
|
2693 |
(dzp->z_phys->zp_flags & ZFS_XATTR)) { |
|
2694 |
ZFS_EXIT(zfsvfs); |
|
2695 |
return (EINVAL); |
|
2696 |
} |
|
2697 |
||
2698 |
/* |
|
2699 |
* POSIX dictates that we return EPERM here. |
|
2700 |
* Better choices include ENOTSUP or EISDIR. |
|
2701 |
*/ |
|
2702 |
if (svp->v_type == VDIR) { |
|
2703 |
ZFS_EXIT(zfsvfs); |
|
2704 |
return (EPERM); |
|
2705 |
} |
|
2706 |
||
2707 |
if ((uid_t)szp->z_phys->zp_uid != crgetuid(cr) && |
|
2708 |
secpolicy_basic_link(cr) != 0) { |
|
2709 |
ZFS_EXIT(zfsvfs); |
|
2710 |
return (EPERM); |
|
2711 |
} |
|
2712 |
||
2713 |
if (error = zfs_zaccess(dzp, ACE_ADD_FILE, cr)) { |
|
2714 |
ZFS_EXIT(zfsvfs); |
|
2715 |
return (error); |
|
2716 |
} |
|
2717 |
||
2718 |
/* |
|
2719 |
* Attempt to lock directory; fail if entry already exists. |
|
2720 |
*/ |
|
2721 |
if (error = zfs_dirent_lock(&dl, dzp, name, &tzp, ZNEW)) { |
|
2722 |
ZFS_EXIT(zfsvfs); |
|
2723 |
return (error); |
|
2724 |
} |
|
2725 |
||
2726 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
2727 |
dmu_tx_hold_bonus(tx, szp->z_id); |
|
2728 |
dmu_tx_hold_zap(tx, dzp->z_id, 1); |
|
2729 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
2730 |
if (error) { |
|
2731 |
dmu_tx_abort(tx); |
|
2732 |
zfs_dirent_unlock(dl); |
|
2733 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
2734 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
2735 |
goto top; |
|
2736 |
} |
|
2737 |
ZFS_EXIT(zfsvfs); |
|
2738 |
return (error); |
|
2739 |
} |
|
2740 |
||
2741 |
error = zfs_link_create(dl, szp, tx, 0); |
|
2742 |
||
2743 |
if (error == 0) |
|
2744 |
seq = zfs_log_link(zilog, tx, TX_LINK, dzp, szp, name); |
|
2745 |
||
2746 |
dmu_tx_commit(tx); |
|
2747 |
||
2748 |
zfs_dirent_unlock(dl); |
|
2749 |
||
2750 |
zil_commit(zilog, seq, 0); |
|
2751 |
||
2752 |
ZFS_EXIT(zfsvfs); |
|
2753 |
return (error); |
|
2754 |
} |
|
2755 |
||
2756 |
/* |
|
2757 |
* zfs_null_putapage() is used when the file system has been force |
|
2758 |
* unmounted. It just drops the pages. |
|
2759 |
*/ |
|
2760 |
/* ARGSUSED */ |
|
2761 |
static int |
|
2762 |
zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, |
|
2763 |
size_t *lenp, int flags, cred_t *cr) |
|
2764 |
{ |
|
2765 |
pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR); |
|
2766 |
return (0); |
|
2767 |
} |
|
2768 |
||
2769 |
/* ARGSUSED */ |
|
2770 |
static int |
|
2771 |
zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, |
|
2772 |
size_t *lenp, int flags, cred_t *cr) |
|
2773 |
{ |
|
2774 |
znode_t *zp = VTOZ(vp); |
|
2775 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
2776 |
zilog_t *zilog = zfsvfs->z_log; |
|
2777 |
uint64_t seq = 0; |
|
2778 |
dmu_tx_t *tx; |
|
2779 |
u_offset_t off; |
|
2780 |
ssize_t len; |
|
2781 |
caddr_t va; |
|
2782 |
int err; |
|
2783 |
||
2784 |
top: |
|
2785 |
rw_enter(&zp->z_grow_lock, RW_READER); |
|
2786 |
||
2787 |
off = pp->p_offset; |
|
2788 |
len = MIN(PAGESIZE, zp->z_phys->zp_size - off); |
|
2789 |
||
2790 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
2791 |
dmu_tx_hold_write(tx, zp->z_id, off, len); |
|
2792 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
2793 |
err = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
2794 |
if (err != 0) { |
|
2795 |
dmu_tx_abort(tx); |
|
2796 |
rw_exit(&zp->z_grow_lock); |
|
2797 |
if (err == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
2798 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
2799 |
goto top; |
|
2800 |
} |
|
2801 |
goto out; |
|
2802 |
} |
|
2803 |
||
2804 |
va = ppmapin(pp, PROT_READ | PROT_WRITE, (caddr_t)-1); |
|
2805 |
||
2806 |
dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx); |
|
2807 |
||
2808 |
ppmapout(va); |
|
2809 |
||
2810 |
zfs_time_stamper(zp, CONTENT_MODIFIED, tx); |
|
2811 |
seq = zfs_log_write(zilog, tx, TX_WRITE, zp, off, len, 0, NULL); |
|
2812 |
dmu_tx_commit(tx); |
|
2813 |
||
2814 |
rw_exit(&zp->z_grow_lock); |
|
2815 |
||
2816 |
pvn_write_done(pp, B_WRITE | flags); |
|
2817 |
if (offp) |
|
2818 |
*offp = off; |
|
2819 |
if (lenp) |
|
2820 |
*lenp = len; |
|
2821 |
||
1141 | 2822 |
zil_commit(zilog, seq, (flags & B_ASYNC) ? 0 : FDSYNC); |
789 | 2823 |
out: |
2824 |
return (err); |
|
2825 |
} |
|
2826 |
||
2827 |
/* |
|
2828 |
* Copy the portion of the file indicated from pages into the file. |
|
2829 |
* The pages are stored in a page list attached to the files vnode. |
|
2830 |
* |
|
2831 |
* IN: vp - vnode of file to push page data to. |
|
2832 |
* off - position in file to put data. |
|
2833 |
* len - amount of data to write. |
|
2834 |
* flags - flags to control the operation. |
|
2835 |
* cr - credentials of caller. |
|
2836 |
* |
|
2837 |
* RETURN: 0 if success |
|
2838 |
* error code if failure |
|
2839 |
* |
|
2840 |
* Timestamps: |
|
2841 |
* vp - ctime|mtime updated |
|
2842 |
*/ |
|
2843 |
static int |
|
2844 |
zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr) |
|
2845 |
{ |
|
2846 |
znode_t *zp = VTOZ(vp); |
|
2847 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
2848 |
page_t *pp; |
|
2849 |
size_t io_len; |
|
2850 |
u_offset_t io_off; |
|
2851 |
int error = 0; |
|
2852 |
||
2853 |
ZFS_ENTER(zfsvfs); |
|
2854 |
||
2855 |
ASSERT(zp->z_dbuf_held && zp->z_phys); |
|
2856 |
||
2857 |
if (len == 0) { |
|
2858 |
/* |
|
2859 |
* Search the entire vp list for pages >= off. |
|
2860 |
*/ |
|
2861 |
error = pvn_vplist_dirty(vp, (u_offset_t)off, zfs_putapage, |
|
2862 |
flags, cr); |
|
2863 |
ZFS_EXIT(zfsvfs); |
|
2864 |
return (error); |
|
2865 |
} |
|
2866 |
||
2867 |
if (off > zp->z_phys->zp_size) { |
|
2868 |
/* past end of file */ |
|
2869 |
ZFS_EXIT(zfsvfs); |
|
2870 |
return (0); |
|
2871 |
} |
|
2872 |
||
2873 |
len = MIN(len, zp->z_phys->zp_size - off); |
|
2874 |
||
2875 |
io_off = off; |
|
2876 |
while (io_off < off + len) { |
|
2877 |
if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { |
|
2878 |
pp = page_lookup(vp, io_off, |
|
2879 |
(flags & (B_INVAL | B_FREE)) ? |
|
2880 |
SE_EXCL : SE_SHARED); |
|
2881 |
} else { |
|
2882 |
pp = page_lookup_nowait(vp, io_off, |
|
2883 |
(flags & B_FREE) ? SE_EXCL : SE_SHARED); |
|
2884 |
} |
|
2885 |
||
2886 |
if (pp != NULL && pvn_getdirty(pp, flags)) { |
|
2887 |
int err; |
|
2888 |
||
2889 |
/* |
|
2890 |
* Found a dirty page to push |
|
2891 |
*/ |
|
2892 |
if (err = |
|
2893 |
zfs_putapage(vp, pp, &io_off, &io_len, flags, cr)) |
|
2894 |
error = err; |
|
2895 |
} else { |
|
2896 |
io_len = PAGESIZE; |
|
2897 |
} |
|
2898 |
io_off += io_len; |
|
2899 |
} |
|
2900 |
ZFS_EXIT(zfsvfs); |
|
2901 |
return (error); |
|
2902 |
} |
|
2903 |
||
2904 |
void |
|
2905 |
zfs_inactive(vnode_t *vp, cred_t *cr) |
|
2906 |
{ |
|
2907 |
znode_t *zp = VTOZ(vp); |
|
2908 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
2909 |
int error; |
|
2910 |
||
2911 |
rw_enter(&zfsvfs->z_um_lock, RW_READER); |
|
2912 |
if (zfsvfs->z_unmounted2) { |
|
2913 |
ASSERT(zp->z_dbuf_held == 0); |
|
2914 |
||
2915 |
if (vn_has_cached_data(vp)) { |
|
2916 |
(void) pvn_vplist_dirty(vp, 0, zfs_null_putapage, |
|
2917 |
B_INVAL, cr); |
|
2918 |
} |
|
2919 |
||
2920 |
vp->v_count = 0; /* count arrives as 1 */ |
|
2921 |
zfs_znode_free(zp); |
|
2922 |
rw_exit(&zfsvfs->z_um_lock); |
|
2923 |
VFS_RELE(zfsvfs->z_vfs); |
|
2924 |
return; |
|
2925 |
} |
|
2926 |
||
2927 |
/* |
|
2928 |
* Attempt to push any data in the page cache. If this fails |
|
2929 |
* we will get kicked out later in zfs_zinactive(). |
|
2930 |
*/ |
|
1298 | 2931 |
if (vn_has_cached_data(vp)) { |
2932 |
(void) pvn_vplist_dirty(vp, 0, zfs_putapage, B_INVAL|B_ASYNC, |
|
2933 |
cr); |
|
2934 |
} |
|
789 | 2935 |
|
2936 |
if (zp->z_atime_dirty && zp->z_reap == 0) { |
|
2937 |
dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os); |
|
2938 |
||
2939 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
2940 |
error = dmu_tx_assign(tx, TXG_WAIT); |
|
2941 |
if (error) { |
|
2942 |
dmu_tx_abort(tx); |
|
2943 |
} else { |
|
2944 |
dmu_buf_will_dirty(zp->z_dbuf, tx); |
|
2945 |
mutex_enter(&zp->z_lock); |
|
2946 |
zp->z_atime_dirty = 0; |
|
2947 |
mutex_exit(&zp->z_lock); |
|
2948 |
dmu_tx_commit(tx); |
|
2949 |
} |
|
2950 |
} |
|
2951 |
||
2952 |
zfs_zinactive(zp); |
|
2953 |
rw_exit(&zfsvfs->z_um_lock); |
|
2954 |
} |
|
2955 |
||
2956 |
/* |
|
2957 |
* Bounds-check the seek operation. |
|
2958 |
* |
|
2959 |
* IN: vp - vnode seeking within |
|
2960 |
* ooff - old file offset |
|
2961 |
* noffp - pointer to new file offset |
|
2962 |
* |
|
2963 |
* RETURN: 0 if success |
|
2964 |
* EINVAL if new offset invalid |
|
2965 |
*/ |
|
2966 |
/* ARGSUSED */ |
|
2967 |
static int |
|
2968 |
zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp) |
|
2969 |
{ |
|
2970 |
if (vp->v_type == VDIR) |
|
2971 |
return (0); |
|
2972 |
return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); |
|
2973 |
} |
|
2974 |
||
2975 |
/* |
|
2976 |
* Pre-filter the generic locking function to trap attempts to place |
|
2977 |
* a mandatory lock on a memory mapped file. |
|
2978 |
*/ |
|
2979 |
static int |
|
2980 |
zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset, |
|
2981 |
flk_callback_t *flk_cbp, cred_t *cr) |
|
2982 |
{ |
|
2983 |
znode_t *zp = VTOZ(vp); |
|
2984 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
2985 |
uint_t cnt = 1; |
|
2986 |
int error; |
|
2987 |
||
2988 |
ZFS_ENTER(zfsvfs); |
|
2989 |
||
2990 |
/* |
|
2991 |
* If file is being mapped, disallow frlock. We set the mapcnt to |
|
2992 |
* -1 here to signal that we are in the process of setting a lock. |
|
2993 |
* This prevents a race with zfs_map(). |
|
2994 |
* XXX - well, sort of; since zfs_map() does not change z_mapcnt, |
|
2995 |
* we could be in the middle of zfs_map() and still call fs_frlock(). |
|
2996 |
* Also, we are doing no checking in zfs_addmap() (where z_mapcnt |
|
2997 |
* *is* manipulated). |
|
2998 |
*/ |
|
2999 |
if (MANDMODE((mode_t)zp->z_phys->zp_mode) && |
|
3000 |
(int)(cnt = atomic_cas_32(&zp->z_mapcnt, 0, -1)) > 0) { |
|
3001 |
ZFS_EXIT(zfsvfs); |
|
3002 |
return (EAGAIN); |
|
3003 |
} |
|
3004 |
error = fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr); |
|
3005 |
ASSERT((cnt != 0) || ((int)atomic_cas_32(&zp->z_mapcnt, -1, 0) == -1)); |
|
3006 |
ZFS_EXIT(zfsvfs); |
|
3007 |
return (error); |
|
3008 |
} |
|
3009 |
||
3010 |
/* |
|
3011 |
* If we can't find a page in the cache, we will create a new page |
|
3012 |
* and fill it with file data. For efficiency, we may try to fill |
|
3013 |
* multiple pages as once (klustering). |
|
3014 |
*/ |
|
3015 |
static int |
|
3016 |
zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg, |
|
3017 |
caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw) |
|
3018 |
{ |
|
3019 |
znode_t *zp = VTOZ(vp); |
|
3020 |
page_t *pp, *cur_pp; |
|
3021 |
objset_t *os = zp->z_zfsvfs->z_os; |
|
3022 |
caddr_t va; |
|
3023 |
u_offset_t io_off, total; |
|
3024 |
uint64_t oid = zp->z_id; |
|
3025 |
size_t io_len; |
|
3026 |
int err; |
|
3027 |
||
3028 |
/* |
|
3029 |
* If we are only asking for a single page don't bother klustering. |
|
3030 |
*/ |
|
3031 |
if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE || |
|
3032 |
off > zp->z_phys->zp_size) { |
|
3033 |
io_off = off; |
|
3034 |
io_len = PAGESIZE; |
|
3035 |
pp = page_create_va(vp, io_off, io_len, PG_WAIT, seg, addr); |
|
3036 |
} else { |
|
3037 |
/* |
|
3038 |
* Try to fill a kluster of pages (a blocks worth). |
|
3039 |
*/ |
|
3040 |
size_t klen; |
|
3041 |
u_offset_t koff; |
|
3042 |
||
3043 |
if (!ISP2(zp->z_blksz)) { |
|
3044 |
/* Only one block in the file. */ |
|
3045 |
klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE); |
|
3046 |
koff = 0; |
|
3047 |
} else { |
|
3048 |
klen = plsz; |
|
3049 |
koff = P2ALIGN(off, (u_offset_t)klen); |
|
3050 |
} |
|
3051 |
if (klen > zp->z_phys->zp_size) |
|
3052 |
klen = P2ROUNDUP(zp->z_phys->zp_size, |
|
3053 |
(uint64_t)PAGESIZE); |
|
3054 |
pp = pvn_read_kluster(vp, off, seg, addr, &io_off, |
|
3055 |
&io_len, koff, klen, 0); |
|
3056 |
} |
|
3057 |
if (pp == NULL) { |
|
3058 |
/* |
|
3059 |
* Some other thread entered the page before us. |
|
3060 |
* Return to zfs_getpage to retry the lookup. |
|
3061 |
*/ |
|
3062 |
*pl = NULL; |
|
3063 |
return (0); |
|
3064 |
} |
|
3065 |
||
3066 |
/* |
|
3067 |
* Fill the pages in the kluster. |
|
3068 |
*/ |
|
3069 |
cur_pp = pp; |
|
3070 |
for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) { |
|
3071 |
ASSERT(io_off == cur_pp->p_offset); |
|
3072 |
va = ppmapin(cur_pp, PROT_READ | PROT_WRITE, (caddr_t)-1); |
|
3073 |
err = dmu_read_canfail(os, oid, io_off, PAGESIZE, va); |
|
3074 |
ppmapout(va); |
|
3075 |
if (err) { |
|
3076 |
/* On error, toss the entire kluster */ |
|
3077 |
pvn_read_done(pp, B_ERROR); |
|
3078 |
return (err); |
|
3079 |
} |
|
3080 |
cur_pp = cur_pp->p_next; |
|
3081 |
} |
|
3082 |
out: |
|
3083 |
/* |
|
3084 |
* Fill in the page list array from the kluster. If |
|
3085 |
* there are too many pages in the kluster, return |
|
3086 |
* as many pages as possible starting from the desired |
|
3087 |
* offset `off'. |
|
3088 |
* NOTE: the page list will always be null terminated. |
|
3089 |
*/ |
|
3090 |
pvn_plist_init(pp, pl, plsz, off, io_len, rw); |
|
3091 |
||
3092 |
return (0); |
|
3093 |
} |
|
3094 |
||
3095 |
/* |
|
3096 |
* Return pointers to the pages for the file region [off, off + len] |
|
3097 |
* in the pl array. If plsz is greater than len, this function may |
|
3098 |
* also return page pointers from before or after the specified |
|
3099 |
* region (i.e. some region [off', off' + plsz]). These additional |
|
3100 |
* pages are only returned if they are already in the cache, or were |
|
3101 |
* created as part of a klustered read. |
|
3102 |
* |
|
3103 |
* IN: vp - vnode of file to get data from. |
|
3104 |
* off - position in file to get data from. |
|
3105 |
* len - amount of data to retrieve. |
|
3106 |
* plsz - length of provided page list. |
|
3107 |
* seg - segment to obtain pages for. |
|
3108 |
* addr - virtual address of fault. |
|
3109 |
* rw - mode of created pages. |
|
3110 |
* cr - credentials of caller. |
|
3111 |
* |
|
3112 |
* OUT: protp - protection mode of created pages. |
|
3113 |
* pl - list of pages created. |
|
3114 |
* |
|
3115 |
* RETURN: 0 if success |
|
3116 |
* error code if failure |
|
3117 |
* |
|
3118 |
* Timestamps: |
|
3119 |
* vp - atime updated |
|
3120 |
*/ |
|
3121 |
/* ARGSUSED */ |
|
3122 |
static int |
|
3123 |
zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp, |
|
3124 |
page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, |
|
3125 |
enum seg_rw rw, cred_t *cr) |
|
3126 |
{ |
|
3127 |
znode_t *zp = VTOZ(vp); |
|
3128 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
3129 |
page_t *pp, **pl0 = pl; |
|
3130 |
int cnt = 0, need_unlock = 0, err = 0; |
|
3131 |
||
3132 |
ZFS_ENTER(zfsvfs); |
|
3133 |
||
3134 |
if (protp) |
|
3135 |
*protp = PROT_ALL; |
|
3136 |
||
3137 |
ASSERT(zp->z_dbuf_held && zp->z_phys); |
|
3138 |
||
3139 |
/* no faultahead (for now) */ |
|
3140 |
if (pl == NULL) { |
|
3141 |
ZFS_EXIT(zfsvfs); |
|
3142 |
return (0); |
|
3143 |
} |
|
3144 |
||
3145 |
/* can't fault past EOF */ |
|
3146 |
if (off >= zp->z_phys->zp_size) { |
|
3147 |
ZFS_EXIT(zfsvfs); |
|
3148 |
return (EFAULT); |
|
3149 |
} |
|
3150 |
||
3151 |
/* |
|
3152 |
* Make sure nobody restructures the file (changes block size) |
|
3153 |
* in the middle of the getpage. |
|
3154 |
*/ |
|
3155 |
rw_enter(&zp->z_grow_lock, RW_READER); |
|
3156 |
||
3157 |
/* |
|
3158 |
* If we already own the lock, then we must be page faulting |
|
3159 |
* in the middle of a write to this file (i.e., we are writing |
|
3160 |
* to this file using data from a mapped region of the file). |
|
3161 |
*/ |
|
3162 |
if (!rw_owner(&zp->z_map_lock)) { |
|
3163 |
rw_enter(&zp->z_map_lock, RW_WRITER); |
|
3164 |
need_unlock = TRUE; |
|
3165 |
} |
|
3166 |
||
3167 |
/* |
|
3168 |
* Loop through the requested range [off, off + len] looking |
|
3169 |
* for pages. If we don't find a page, we will need to create |
|
3170 |
* a new page and fill it with data from the file. |
|
3171 |
*/ |
|
3172 |
while (len > 0) { |
|
3173 |
if (plsz < PAGESIZE) |
|
3174 |
break; |
|
3175 |
if (pp = page_lookup(vp, off, SE_SHARED)) { |
|
3176 |
*pl++ = pp; |
|
3177 |
off += PAGESIZE; |
|
3178 |
addr += PAGESIZE; |
|
3179 |
len -= PAGESIZE; |
|
3180 |
plsz -= PAGESIZE; |
|
3181 |
} else { |
|
3182 |
err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw); |
|
3183 |
/* |
|
3184 |
* klustering may have changed our region |
|
3185 |
* to be block aligned. |
|
3186 |
*/ |
|
3187 |
if (((pp = *pl) != 0) && (off != pp->p_offset)) { |
|
3188 |
int delta = off - pp->p_offset; |
|
3189 |
len += delta; |
|
3190 |
off -= delta; |
|
3191 |
addr -= delta; |
|
3192 |
} |
|
3193 |
while (*pl) { |
|
3194 |
pl++; |
|
3195 |
cnt++; |
|
3196 |
off += PAGESIZE; |
|
3197 |
addr += PAGESIZE; |
|
3198 |
plsz -= PAGESIZE; |
|
3199 |
if (len > PAGESIZE) |
|
3200 |
len -= PAGESIZE; |
|
3201 |
else |
|
3202 |
len = 0; |
|
3203 |
} |
|
3204 |
} |
|
3205 |
if (err) |
|
3206 |
goto out; |
|
3207 |
} |
|
3208 |
||
3209 |
/* |
|
3210 |
* Fill out the page array with any pages already in the cache. |
|
3211 |
*/ |
|
3212 |
while (plsz > 0) { |
|
3213 |
pp = page_lookup_nowait(vp, off, SE_SHARED); |
|
3214 |
if (pp == NULL) |
|
3215 |
break; |
|
3216 |
*pl++ = pp; |
|
3217 |
off += PAGESIZE; |
|
3218 |
plsz -= PAGESIZE; |
|
3219 |
} |
|
3220 |
||
3221 |
ZFS_ACCESSTIME_STAMP(zfsvfs, zp); |
|
3222 |
out: |
|
3223 |
if (err) { |
|
3224 |
/* |
|
3225 |
* Release any pages we have locked. |
|
3226 |
*/ |
|
3227 |
while (pl > pl0) |
|
3228 |
page_unlock(*--pl); |
|
3229 |
} |
|
3230 |
*pl = NULL; |
|
3231 |
||
3232 |
if (need_unlock) |
|
3233 |
rw_exit(&zp->z_map_lock); |
|
3234 |
rw_exit(&zp->z_grow_lock); |
|
3235 |
||
3236 |
ZFS_EXIT(zfsvfs); |
|
3237 |
return (err); |
|
3238 |
} |
|
3239 |
||
3240 |
static int |
|
3241 |
zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp, |
|
3242 |
size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr) |
|
3243 |
{ |
|
3244 |
znode_t *zp = VTOZ(vp); |
|
3245 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
3246 |
segvn_crargs_t vn_a; |
|
3247 |
int error; |
|
3248 |
||
3249 |
ZFS_ENTER(zfsvfs); |
|
3250 |
||
3251 |
if (vp->v_flag & VNOMAP) { |
|
3252 |
ZFS_EXIT(zfsvfs); |
|
3253 |
return (ENOSYS); |
|
3254 |
} |
|
3255 |
||
3256 |
if (off < 0 || len > MAXOFFSET_T - off) { |
|
3257 |
ZFS_EXIT(zfsvfs); |
|
3258 |
return (ENXIO); |
|
3259 |
} |
|
3260 |
||
3261 |
if (vp->v_type != VREG) { |
|
3262 |
ZFS_EXIT(zfsvfs); |
|
3263 |
return (ENODEV); |
|
3264 |
} |
|
3265 |
||
3266 |
/* |
|
3267 |
* If file is locked, disallow mapping. |
|
3268 |
* XXX - since we don't modify z_mapcnt here, there is nothing |
|
3269 |
* to stop a file lock being placed immediately after we complete |
|
3270 |
* this check. |
|
3271 |
*/ |
|
3272 |
if (MANDMODE((mode_t)zp->z_phys->zp_mode)) { |
|
3273 |
if (vn_has_flocks(vp) || zp->z_mapcnt == -1) { |
|
3274 |
ZFS_EXIT(zfsvfs); |
|
3275 |
return (EAGAIN); |
|
3276 |
} |
|
3277 |
} |
|
3278 |
||
3279 |
as_rangelock(as); |
|
3280 |
if ((flags & MAP_FIXED) == 0) { |
|
3281 |
map_addr(addrp, len, off, 1, flags); |
|
3282 |
if (*addrp == NULL) { |
|
3283 |
as_rangeunlock(as); |
|
3284 |
ZFS_EXIT(zfsvfs); |
|
3285 |
return (ENOMEM); |
|
3286 |
} |
|
3287 |
} else { |
|
3288 |
/* |
|
3289 |
* User specified address - blow away any previous mappings |
|
3290 |
*/ |
|
3291 |
(void) as_unmap(as, *addrp, len); |
|
3292 |
} |
|
3293 |
||
3294 |
vn_a.vp = vp; |
|
3295 |
vn_a.offset = (u_offset_t)off; |
|
3296 |
vn_a.type = flags & MAP_TYPE; |
|
3297 |
vn_a.prot = prot; |
|
3298 |
vn_a.maxprot = maxprot; |
|
3299 |
vn_a.cred = cr; |
|
3300 |
vn_a.amp = NULL; |
|
3301 |
vn_a.flags = flags & ~MAP_TYPE; |
|
3302 |
||
3303 |
error = as_map(as, *addrp, len, segvn_create, &vn_a); |
|
3304 |
||
3305 |
as_rangeunlock(as); |
|
3306 |
ZFS_EXIT(zfsvfs); |
|
3307 |
return (error); |
|
3308 |
} |
|
3309 |
||
3310 |
/* ARGSUSED */ |
|
3311 |
static int |
|
3312 |
zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, |
|
3313 |
size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr) |
|
3314 |
{ |
|
3315 |
/* |
|
3316 |
* XXX - shouldn't we be checking for file locks here? |
|
3317 |
*/ |
|
3318 |
ASSERT3U(VTOZ(vp)->z_mapcnt, >=, 0); |
|
3319 |
atomic_add_32(&VTOZ(vp)->z_mapcnt, btopr(len)); |
|
3320 |
return (0); |
|
3321 |
} |
|
3322 |
||
3323 |
/* ARGSUSED */ |
|
3324 |
static int |
|
3325 |
zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, |
|
3326 |
size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr) |
|
3327 |
{ |
|
3328 |
atomic_add_32(&VTOZ(vp)->z_mapcnt, -btopr(len)); |
|
3329 |
ASSERT3U(VTOZ(vp)->z_mapcnt, >=, 0); |
|
3330 |
return (0); |
|
3331 |
} |
|
3332 |
||
3333 |
/* |
|
3334 |
* Free or allocate space in a file. Currently, this function only |
|
3335 |
* supports the `F_FREESP' command. However, this command is somewhat |
|
3336 |
* misnamed, as its functionality includes the ability to allocate as |
|
3337 |
* well as free space. |
|
3338 |
* |
|
3339 |
* IN: vp - vnode of file to free data in. |
|
3340 |
* cmd - action to take (only F_FREESP supported). |
|
3341 |
* bfp - section of file to free/alloc. |
|
3342 |
* flag - current file open mode flags. |
|
3343 |
* offset - current file offset. |
|
3344 |
* cr - credentials of caller [UNUSED]. |
|
3345 |
* |
|
3346 |
* RETURN: 0 if success |
|
3347 |
* error code if failure |
|
3348 |
* |
|
3349 |
* Timestamps: |
|
3350 |
* vp - ctime|mtime updated |
|
3351 |
* |
|
3352 |
* NOTE: This function is limited in that it will only permit space to |
|
3353 |
* be freed at the end of a file. In essence, this function simply |
|
3354 |
* allows one to set the file size. |
|
3355 |
*/ |
|
3356 |
/* ARGSUSED */ |
|
3357 |
static int |
|
3358 |
zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag, |
|
3359 |
offset_t offset, cred_t *cr, caller_context_t *ct) |
|
3360 |
{ |
|
3361 |
dmu_tx_t *tx; |
|
3362 |
znode_t *zp = VTOZ(vp); |
|
3363 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
3364 |
zilog_t *zilog = zfsvfs->z_log; |
|
3365 |
uint64_t seq = 0; |
|
3366 |
uint64_t off, len; |
|
3367 |
int error; |
|
3368 |
||
3369 |
ZFS_ENTER(zfsvfs); |
|
3370 |
||
3371 |
top: |
|
3372 |
if (cmd != F_FREESP) { |
|
3373 |
ZFS_EXIT(zfsvfs); |
|
3374 |
return (EINVAL); |
|
3375 |
} |
|
3376 |
||
3377 |
if (error = convoff(vp, bfp, 0, offset)) { |
|
3378 |
ZFS_EXIT(zfsvfs); |
|
3379 |
return (error); |
|
3380 |
} |
|
3381 |
||
3382 |
if (bfp->l_len < 0) { |
|
3383 |
ZFS_EXIT(zfsvfs); |
|
3384 |
return (EINVAL); |
|
3385 |
} |
|
3386 |
||
3387 |
off = bfp->l_start; |
|
3388 |
len = bfp->l_len; |
|
3389 |
tx = dmu_tx_create(zfsvfs->z_os); |
|
3390 |
/* |
|
3391 |
* Grab the grow_lock to serialize this change with |
|
3392 |
* respect to other file size changes. |
|
3393 |
*/ |
|
3394 |
dmu_tx_hold_bonus(tx, zp->z_id); |
|
3395 |
rw_enter(&zp->z_grow_lock, RW_WRITER); |
|
3396 |
if (off + len > zp->z_blksz && zp->z_blksz < zfsvfs->z_max_blksz && |
|
3397 |
off >= zp->z_phys->zp_size) { |
|
3398 |
/* |
|
3399 |
* We are increasing the length of the file, |
|
3400 |
* and this may mean a block size increase. |
|
3401 |
*/ |
|
3402 |
dmu_tx_hold_write(tx, zp->z_id, 0, |
|
3403 |
MIN(off + len, zfsvfs->z_max_blksz)); |
|
3404 |
} else if (off < zp->z_phys->zp_size) { |
|
3405 |
/* |
|
3406 |
* If len == 0, we are truncating the file. |
|
3407 |
*/ |
|
3408 |
dmu_tx_hold_free(tx, zp->z_id, off, len ? len : DMU_OBJECT_END); |
|
3409 |
} |
|
3410 |
||
3411 |
error = dmu_tx_assign(tx, zfsvfs->z_assign); |
|
3412 |
if (error) { |
|
3413 |
dmu_tx_abort(tx); |
|
3414 |
rw_exit(&zp->z_grow_lock); |
|
3415 |
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { |
|
3416 |
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); |
|
3417 |
goto top; |
|
3418 |
} |
|
3419 |
ZFS_EXIT(zfsvfs); |
|
3420 |
return (error); |
|
3421 |
} |
|
3422 |
||
3423 |
error = zfs_freesp(zp, off, len, flag, tx, cr); |
|
3424 |
||
3425 |
if (error == 0) { |
|
3426 |
zfs_time_stamper(zp, CONTENT_MODIFIED, tx); |
|
3427 |
seq = zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); |
|
3428 |
} |
|
3429 |
||
3430 |
rw_exit(&zp->z_grow_lock); |
|
3431 |
||
3432 |
dmu_tx_commit(tx); |
|
3433 |
||
3434 |
zil_commit(zilog, seq, 0); |
|
3435 |
||
3436 |
ZFS_EXIT(zfsvfs); |
|
3437 |
return (error); |
|
3438 |
} |
|
3439 |
||
3440 |
static int |
|
3441 |
zfs_fid(vnode_t *vp, fid_t *fidp) |
|
3442 |
{ |
|
3443 |
znode_t *zp = VTOZ(vp); |
|
3444 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
3445 |
uint32_t gen = (uint32_t)zp->z_phys->zp_gen; |
|
3446 |
uint64_t object = zp->z_id; |
|
3447 |
zfid_short_t *zfid; |
|
3448 |
int size, i; |
|
3449 |
||
3450 |
ZFS_ENTER(zfsvfs); |
|
3451 |
||
3452 |
size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN; |
|
3453 |
if (fidp->fid_len < size) { |
|
3454 |
fidp->fid_len = size; |
|
3455 |
return (ENOSPC); |
|
3456 |
} |
|
3457 |
||
3458 |
zfid = (zfid_short_t *)fidp; |
|
3459 |
||
3460 |
zfid->zf_len = size; |
|
3461 |
||
3462 |
for (i = 0; i < sizeof (zfid->zf_object); i++) |
|
3463 |
zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); |
|
3464 |
||
3465 |
/* Must have a non-zero generation number to distinguish from .zfs */ |
|
3466 |
if (gen == 0) |
|
3467 |
gen = 1; |
|
3468 |
for (i = 0; i < sizeof (zfid->zf_gen); i++) |
|
3469 |
zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i)); |
|
3470 |
||
3471 |
if (size == LONG_FID_LEN) { |
|
3472 |
uint64_t objsetid = dmu_objset_id(zfsvfs->z_os); |
|
3473 |
zfid_long_t *zlfid; |
|
3474 |
||
3475 |
zlfid = (zfid_long_t *)fidp; |
|
3476 |
||
3477 |
for (i = 0; i < sizeof (zlfid->zf_setid); i++) |
|
3478 |
zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i)); |
|
3479 |
||
3480 |
/* XXX - this should be the generation number for the objset */ |
|
3481 |
for (i = 0; i < sizeof (zlfid->zf_setgen); i++) |
|
3482 |
zlfid->zf_setgen[i] = 0; |
|
3483 |
} |
|
3484 |
||
3485 |
ZFS_EXIT(zfsvfs); |
|
3486 |
return (0); |
|
3487 |
} |
|
3488 |
||
3489 |
static int |
|
3490 |
zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr) |
|
3491 |
{ |
|
3492 |
znode_t *zp, *xzp; |
|
3493 |
zfsvfs_t *zfsvfs; |
|
3494 |
zfs_dirlock_t *dl; |
|
3495 |
int error; |
|
3496 |
||
3497 |
switch (cmd) { |
|
3498 |
case _PC_LINK_MAX: |
|
3499 |
*valp = ULONG_MAX; |
|
3500 |
return (0); |
|
3501 |
||
3502 |
case _PC_FILESIZEBITS: |
|
3503 |
*valp = 64; |
|
3504 |
return (0); |
|
3505 |
||
3506 |
case _PC_XATTR_EXISTS: |
|
3507 |
zp = VTOZ(vp); |
|
3508 |
zfsvfs = zp->z_zfsvfs; |
|
3509 |
ZFS_ENTER(zfsvfs); |
|
3510 |
*valp = 0; |
|
3511 |
error = zfs_dirent_lock(&dl, zp, "", &xzp, |
|
3512 |
ZXATTR | ZEXISTS | ZSHARED); |
|
3513 |
if (error == 0) { |
|
3514 |
zfs_dirent_unlock(dl); |
|
3515 |
if (!zfs_dirempty(xzp)) |
|
3516 |
*valp = 1; |
|
3517 |
VN_RELE(ZTOV(xzp)); |
|
3518 |
} else if (error == ENOENT) { |
|
3519 |
/* |
|
3520 |
* If there aren't extended attributes, it's the |
|
3521 |
* same as having zero of them. |
|
3522 |
*/ |
|
3523 |
error = 0; |
|
3524 |
} |
|
3525 |
ZFS_EXIT(zfsvfs); |
|
3526 |
return (error); |
|
3527 |
||
3528 |
case _PC_ACL_ENABLED: |
|
3529 |
*valp = _ACL_ACE_ENABLED; |
|
3530 |
return (0); |
|
3531 |
||
3532 |
case _PC_MIN_HOLE_SIZE: |
|
3533 |
*valp = (ulong_t)SPA_MINBLOCKSIZE; |
|
3534 |
return (0); |
|
3535 |
||
3536 |
default: |
|
3537 |
return (fs_pathconf(vp, cmd, valp, cr)); |
|
3538 |
} |
|
3539 |
} |
|
3540 |
||
3541 |
/*ARGSUSED*/ |
|
3542 |
static int |
|
3543 |
zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr) |
|
3544 |
{ |
|
3545 |
znode_t *zp = VTOZ(vp); |
|
3546 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
3547 |
int error; |
|
3548 |
||
3549 |
ZFS_ENTER(zfsvfs); |
|
3550 |
error = zfs_getacl(zp, vsecp, cr); |
|
3551 |
ZFS_EXIT(zfsvfs); |
|
3552 |
||
3553 |
return (error); |
|
3554 |
} |
|
3555 |
||
3556 |
/*ARGSUSED*/ |
|
3557 |
static int |
|
3558 |
zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr) |
|
3559 |
{ |
|
3560 |
znode_t *zp = VTOZ(vp); |
|
3561 |
zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
|
3562 |
int error; |
|
3563 |
||
3564 |
ZFS_ENTER(zfsvfs); |
|
3565 |
error = zfs_setacl(zp, vsecp, cr); |
|
3566 |
ZFS_EXIT(zfsvfs); |
|
3567 |
return (error); |
|
3568 |
} |
|
3569 |
||
3570 |
/* |
|
3571 |
* Predeclare these here so that the compiler assumes that |
|
3572 |
* this is an "old style" function declaration that does |
|
3573 |
* not include arguments => we won't get type mismatch errors |
|
3574 |
* in the initializations that follow. |
|
3575 |
*/ |
|
3576 |
static int zfs_inval(); |
|
3577 |
static int zfs_isdir(); |
|
3578 |
||
3579 |
static int |
|
3580 |
zfs_inval() |
|
3581 |
{ |
|
3582 |
return (EINVAL); |
|
3583 |
} |
|
3584 |
||
3585 |
static int |
|
3586 |
zfs_isdir() |
|
3587 |
{ |
|
3588 |
return (EISDIR); |
|
3589 |
} |
|
3590 |
/* |
|
3591 |
* Directory vnode operations template |
|
3592 |
*/ |
|
3593 |
vnodeops_t *zfs_dvnodeops; |
|
3594 |
const fs_operation_def_t zfs_dvnodeops_template[] = { |
|
3595 |
VOPNAME_OPEN, zfs_open, |
|
3596 |
VOPNAME_CLOSE, zfs_close, |
|
3597 |
VOPNAME_READ, zfs_isdir, |
|
3598 |
VOPNAME_WRITE, zfs_isdir, |
|
3599 |
VOPNAME_IOCTL, zfs_ioctl, |
|
3600 |
VOPNAME_GETATTR, zfs_getattr, |
|
3601 |
VOPNAME_SETATTR, zfs_setattr, |
|
3602 |
VOPNAME_ACCESS, zfs_access, |
|
3603 |
VOPNAME_LOOKUP, zfs_lookup, |
|
3604 |
VOPNAME_CREATE, zfs_create, |
|
3605 |
VOPNAME_REMOVE, zfs_remove, |
|
3606 |
VOPNAME_LINK, zfs_link, |
|
3607 |
VOPNAME_RENAME, zfs_rename, |
|
3608 |
VOPNAME_MKDIR, zfs_mkdir, |
|
3609 |
VOPNAME_RMDIR, zfs_rmdir, |
|
3610 |
VOPNAME_READDIR, zfs_readdir, |
|
3611 |
VOPNAME_SYMLINK, zfs_symlink, |
|
3612 |
VOPNAME_FSYNC, zfs_fsync, |
|
3613 |
VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, |
|
3614 |
VOPNAME_FID, zfs_fid, |
|
3615 |
VOPNAME_SEEK, zfs_seek, |
|
3616 |
VOPNAME_PATHCONF, zfs_pathconf, |
|
3617 |
VOPNAME_GETSECATTR, zfs_getsecattr, |
|
3618 |
VOPNAME_SETSECATTR, zfs_setsecattr, |
|
3619 |
NULL, NULL |
|
3620 |
}; |
|
3621 |
||
3622 |
/* |
|
3623 |
* Regular file vnode operations template |
|
3624 |
*/ |
|
3625 |
vnodeops_t *zfs_fvnodeops; |
|
3626 |
const fs_operation_def_t zfs_fvnodeops_template[] = { |
|
3627 |
VOPNAME_OPEN, zfs_open, |
|
3628 |
VOPNAME_CLOSE, zfs_close, |
|
3629 |
VOPNAME_READ, zfs_read, |
|
3630 |
VOPNAME_WRITE, zfs_write, |
|
3631 |
VOPNAME_IOCTL, zfs_ioctl, |
|
3632 |
VOPNAME_GETATTR, zfs_getattr, |
|
3633 |
VOPNAME_SETATTR, zfs_setattr, |
|
3634 |
VOPNAME_ACCESS, zfs_access, |
|
3635 |
VOPNAME_LOOKUP, zfs_lookup, |
|
3636 |
VOPNAME_RENAME, zfs_rename, |
|
3637 |
VOPNAME_FSYNC, zfs_fsync, |
|
3638 |
VOPNAME_INACTIVE, (fs_generic_func_p)zfs_inactive, |
|
3639 |
VOPNAME_FID, zfs_fid, |
|
3640 |
VOPNAME_SEEK, zfs_seek, |
|
3641 |
VOPNAME_FRLOCK, zfs_frlock, |
|
3642 |
VOPNAME_SPACE, zfs_space, |
|
3643 |
VOPNAME_GETPAGE, zfs_getpage, |
|
3644 |
VOPNAME_PUTPAGE, zfs_putpage, |
|
3645 |
VOPNAME_MAP, (fs_generic_func_p) zfs_map, |
|
3646 |
VOPNAME_ADDMAP, (fs_generic_func_p) zfs_addmap, |
|
3647 |
VOPNAME_DELMAP, zfs_delmap, |
|
3648 |
VOPNAME_PATHCONF, zfs_pathconf, |
|
3649 |
VOPNAME_GETSECATTR, zfs_getsecattr, |
|
3650 |
VOPNAME_SETSECATTR, zfs_setsecattr, |
|
3651 |
VOPNAME_VNEVENT, fs_vnevent_support, |
|
3652 |
NULL, NULL |
|
3653 |
}; |
|
3654 |
||
3655 |
/* |
|
3656 |
* Symbolic link vnode operations template |
|
3657 |
*/ |
|
3658 |
vnodeops_t *zfs_symvnodeops; |
|
3659 |
const fs_operation_def_t zfs_symvnodeops_template[] = { |
|
3660 |
VOPNAME_GETATTR, zfs_getattr, |
|
3661 |
VOPNAME_SETATTR, zfs_setattr, |
|
3662 |
VOPNAME_ACCESS, zfs_access, |
|
3663 |
VOPNAME_RENAME, zfs_rename, |
|
3664 |
VOPNAME_READLINK, zfs_readlink, |
|
3665 |
VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, |
|
3666 |
VOPNAME_FID, zfs_fid, |
|
3667 |
VOPNAME_PATHCONF, zfs_pathconf, |
|
3668 |
VOPNAME_VNEVENT, fs_vnevent_support, |
|
3669 |
NULL, NULL |
|
3670 |
}; |
|
3671 |
||
3672 |
/* |
|
3673 |
* Extended attribute directory vnode operations template |
|
3674 |
* This template is identical to the directory vnodes |
|
3675 |
* operation template except for restricted operations: |
|
3676 |
* VOP_MKDIR() |
|
3677 |
* VOP_SYMLINK() |
|
3678 |
* Note that there are other restrictions embedded in: |
|
3679 |
* zfs_create() - restrict type to VREG |
|
3680 |
* zfs_link() - no links into/out of attribute space |
|
3681 |
* zfs_rename() - no moves into/out of attribute space |
|
3682 |
*/ |
|
3683 |
vnodeops_t *zfs_xdvnodeops; |
|
3684 |
const fs_operation_def_t zfs_xdvnodeops_template[] = { |
|
3685 |
VOPNAME_OPEN, zfs_open, |
|
3686 |
VOPNAME_CLOSE, zfs_close, |
|
3687 |
VOPNAME_IOCTL, zfs_ioctl, |
|
3688 |
VOPNAME_GETATTR, zfs_getattr, |
|
3689 |
VOPNAME_SETATTR, zfs_setattr, |
|
3690 |
VOPNAME_ACCESS, zfs_access, |
|
3691 |
VOPNAME_LOOKUP, zfs_lookup, |
|
3692 |
VOPNAME_CREATE, zfs_create, |
|
3693 |
VOPNAME_REMOVE, zfs_remove, |
|
3694 |
VOPNAME_LINK, zfs_link, |
|
3695 |
VOPNAME_RENAME, zfs_rename, |
|
3696 |
VOPNAME_MKDIR, zfs_inval, |
|
3697 |
VOPNAME_RMDIR, zfs_rmdir, |
|
3698 |
VOPNAME_READDIR, zfs_readdir, |
|
3699 |
VOPNAME_SYMLINK, zfs_inval, |
|
3700 |
VOPNAME_FSYNC, zfs_fsync, |
|
3701 |
VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, |
|
3702 |
VOPNAME_FID, zfs_fid, |
|
3703 |
VOPNAME_SEEK, zfs_seek, |
|
3704 |
VOPNAME_PATHCONF, zfs_pathconf, |
|
3705 |
VOPNAME_GETSECATTR, zfs_getsecattr, |
|
3706 |
VOPNAME_SETSECATTR, zfs_setsecattr, |
|
3707 |
VOPNAME_VNEVENT, fs_vnevent_support, |
|
3708 |
NULL, NULL |
|
3709 |
}; |
|
3710 |
||
3711 |
/* |
|
3712 |
* Error vnode operations template |
|
3713 |
*/ |
|
3714 |
vnodeops_t *zfs_evnodeops; |
|
3715 |
const fs_operation_def_t zfs_evnodeops_template[] = { |
|
3716 |
VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, |
|
3717 |
VOPNAME_PATHCONF, zfs_pathconf, |
|
3718 |
NULL, NULL |
|
3719 |
}; |