410 lines
11 KiB
C
410 lines
11 KiB
C
/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir2.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_bmap.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_rw.h"
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#include "xfs_itable.h"
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#include "xfs_utils.h"
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/*
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* Allocates a new inode from disk and return a pointer to the
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* incore copy. This routine will internally commit the current
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* transaction and allocate a new one if the Space Manager needed
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* to do an allocation to replenish the inode free-list.
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*
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* This routine is designed to be called from xfs_create and
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* xfs_create_dir.
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*
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*/
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int
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xfs_dir_ialloc(
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xfs_trans_t **tpp, /* input: current transaction;
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output: may be a new transaction. */
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xfs_inode_t *dp, /* directory within whose allocate
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the inode. */
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mode_t mode,
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xfs_nlink_t nlink,
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xfs_dev_t rdev,
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cred_t *credp,
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prid_t prid, /* project id */
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int okalloc, /* ok to allocate new space */
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xfs_inode_t **ipp, /* pointer to inode; it will be
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locked. */
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int *committed)
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{
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xfs_trans_t *tp;
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xfs_trans_t *ntp;
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xfs_inode_t *ip;
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xfs_buf_t *ialloc_context = NULL;
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boolean_t call_again = B_FALSE;
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int code;
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uint log_res;
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uint log_count;
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void *dqinfo;
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uint tflags;
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tp = *tpp;
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ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
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/*
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* xfs_ialloc will return a pointer to an incore inode if
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* the Space Manager has an available inode on the free
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* list. Otherwise, it will do an allocation and replenish
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* the freelist. Since we can only do one allocation per
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* transaction without deadlocks, we will need to commit the
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* current transaction and start a new one. We will then
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* need to call xfs_ialloc again to get the inode.
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*
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* If xfs_ialloc did an allocation to replenish the freelist,
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* it returns the bp containing the head of the freelist as
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* ialloc_context. We will hold a lock on it across the
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* transaction commit so that no other process can steal
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* the inode(s) that we've just allocated.
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*/
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code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, okalloc,
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&ialloc_context, &call_again, &ip);
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/*
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* Return an error if we were unable to allocate a new inode.
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* This should only happen if we run out of space on disk or
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* encounter a disk error.
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*/
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if (code) {
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*ipp = NULL;
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return code;
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}
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if (!call_again && (ip == NULL)) {
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*ipp = NULL;
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return XFS_ERROR(ENOSPC);
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}
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/*
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* If call_again is set, then we were unable to get an
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* inode in one operation. We need to commit the current
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* transaction and call xfs_ialloc() again. It is guaranteed
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* to succeed the second time.
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*/
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if (call_again) {
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/*
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* Normally, xfs_trans_commit releases all the locks.
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* We call bhold to hang on to the ialloc_context across
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* the commit. Holding this buffer prevents any other
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* processes from doing any allocations in this
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* allocation group.
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*/
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xfs_trans_bhold(tp, ialloc_context);
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/*
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* Save the log reservation so we can use
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* them in the next transaction.
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*/
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log_res = xfs_trans_get_log_res(tp);
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log_count = xfs_trans_get_log_count(tp);
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/*
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* We want the quota changes to be associated with the next
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* transaction, NOT this one. So, detach the dqinfo from this
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* and attach it to the next transaction.
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*/
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dqinfo = NULL;
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tflags = 0;
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if (tp->t_dqinfo) {
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dqinfo = (void *)tp->t_dqinfo;
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tp->t_dqinfo = NULL;
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tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
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tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
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}
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ntp = xfs_trans_dup(tp);
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code = xfs_trans_commit(tp, 0);
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tp = ntp;
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if (committed != NULL) {
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*committed = 1;
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}
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/*
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* If we get an error during the commit processing,
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* release the buffer that is still held and return
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* to the caller.
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*/
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if (code) {
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xfs_buf_relse(ialloc_context);
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if (dqinfo) {
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tp->t_dqinfo = dqinfo;
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XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp);
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}
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*tpp = ntp;
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*ipp = NULL;
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return code;
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}
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/*
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* transaction commit worked ok so we can drop the extra ticket
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* reference that we gained in xfs_trans_dup()
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*/
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xfs_log_ticket_put(tp->t_ticket);
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code = xfs_trans_reserve(tp, 0, log_res, 0,
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XFS_TRANS_PERM_LOG_RES, log_count);
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/*
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* Re-attach the quota info that we detached from prev trx.
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*/
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if (dqinfo) {
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tp->t_dqinfo = dqinfo;
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tp->t_flags |= tflags;
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}
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if (code) {
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xfs_buf_relse(ialloc_context);
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*tpp = ntp;
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*ipp = NULL;
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return code;
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}
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xfs_trans_bjoin(tp, ialloc_context);
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/*
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* Call ialloc again. Since we've locked out all
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* other allocations in this allocation group,
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* this call should always succeed.
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*/
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code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid,
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okalloc, &ialloc_context, &call_again, &ip);
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/*
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* If we get an error at this point, return to the caller
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* so that the current transaction can be aborted.
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*/
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if (code) {
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*tpp = tp;
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*ipp = NULL;
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return code;
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}
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ASSERT ((!call_again) && (ip != NULL));
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} else {
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if (committed != NULL) {
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*committed = 0;
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}
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}
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*ipp = ip;
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*tpp = tp;
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return 0;
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}
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/*
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* Decrement the link count on an inode & log the change.
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* If this causes the link count to go to zero, initiate the
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* logging activity required to truncate a file.
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*/
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int /* error */
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xfs_droplink(
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xfs_trans_t *tp,
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xfs_inode_t *ip)
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{
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int error;
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xfs_ichgtime(ip, XFS_ICHGTIME_CHG);
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ASSERT (ip->i_d.di_nlink > 0);
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ip->i_d.di_nlink--;
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drop_nlink(VFS_I(ip));
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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error = 0;
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if (ip->i_d.di_nlink == 0) {
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/*
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* We're dropping the last link to this file.
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* Move the on-disk inode to the AGI unlinked list.
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* From xfs_inactive() we will pull the inode from
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* the list and free it.
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*/
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error = xfs_iunlink(tp, ip);
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}
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return error;
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}
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/*
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* This gets called when the inode's version needs to be changed from 1 to 2.
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* Currently this happens when the nlink field overflows the old 16-bit value
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* or when chproj is called to change the project for the first time.
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* As a side effect the superblock version will also get rev'd
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* to contain the NLINK bit.
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*/
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void
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xfs_bump_ino_vers2(
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xfs_trans_t *tp,
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xfs_inode_t *ip)
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{
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xfs_mount_t *mp;
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
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ASSERT(ip->i_d.di_version == 1);
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ip->i_d.di_version = 2;
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ip->i_d.di_onlink = 0;
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memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
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mp = tp->t_mountp;
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if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
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spin_lock(&mp->m_sb_lock);
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if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
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xfs_sb_version_addnlink(&mp->m_sb);
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spin_unlock(&mp->m_sb_lock);
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xfs_mod_sb(tp, XFS_SB_VERSIONNUM);
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} else {
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spin_unlock(&mp->m_sb_lock);
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}
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}
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/* Caller must log the inode */
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}
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/*
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* Increment the link count on an inode & log the change.
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*/
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int
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xfs_bumplink(
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xfs_trans_t *tp,
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xfs_inode_t *ip)
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{
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if (ip->i_d.di_nlink >= XFS_MAXLINK)
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return XFS_ERROR(EMLINK);
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xfs_ichgtime(ip, XFS_ICHGTIME_CHG);
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ASSERT(ip->i_d.di_nlink > 0);
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ip->i_d.di_nlink++;
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inc_nlink(VFS_I(ip));
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if ((ip->i_d.di_version == 1) &&
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(ip->i_d.di_nlink > XFS_MAXLINK_1)) {
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/*
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* The inode has increased its number of links beyond
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* what can fit in an old format inode. It now needs
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* to be converted to a version 2 inode with a 32 bit
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* link count. If this is the first inode in the file
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* system to do this, then we need to bump the superblock
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* version number as well.
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*/
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xfs_bump_ino_vers2(tp, ip);
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}
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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return 0;
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}
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/*
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* Try to truncate the given file to 0 length. Currently called
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* only out of xfs_remove when it has to truncate a file to free
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* up space for the remove to proceed.
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*/
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int
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xfs_truncate_file(
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xfs_mount_t *mp,
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xfs_inode_t *ip)
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{
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xfs_trans_t *tp;
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int error;
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#ifdef QUOTADEBUG
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/*
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* This is called to truncate the quotainodes too.
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*/
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if (XFS_IS_UQUOTA_ON(mp)) {
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if (ip->i_ino != mp->m_sb.sb_uquotino)
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ASSERT(ip->i_udquot);
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}
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if (XFS_IS_OQUOTA_ON(mp)) {
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if (ip->i_ino != mp->m_sb.sb_gquotino)
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ASSERT(ip->i_gdquot);
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}
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#endif
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/*
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* Make the call to xfs_itruncate_start before starting the
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* transaction, because we cannot make the call while we're
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* in a transaction.
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*/
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, (xfs_fsize_t)0);
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if (error) {
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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return error;
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}
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tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE);
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if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
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XFS_TRANS_PERM_LOG_RES,
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XFS_ITRUNCATE_LOG_COUNT))) {
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xfs_trans_cancel(tp, 0);
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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return error;
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}
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/*
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* Follow the normal truncate locking protocol. Since we
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* hold the inode in the transaction, we know that its number
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* of references will stay constant.
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*/
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
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xfs_trans_ihold(tp, ip);
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/*
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* Signal a sync xaction. The only case where that isn't
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* the case is if we're truncating an already unlinked file
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* on a wsync fs. In that case, we know the blocks can't
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* reappear in the file because the links to file are
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* permanently toast. Currently, we're always going to
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* want a sync transaction because this code is being
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* called from places where nlink is guaranteed to be 1
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* but I'm leaving the tests in to protect against future
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* changes -- rcc.
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*/
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error = xfs_itruncate_finish(&tp, ip, (xfs_fsize_t)0,
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XFS_DATA_FORK,
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((ip->i_d.di_nlink != 0 ||
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!(mp->m_flags & XFS_MOUNT_WSYNC))
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? 1 : 0));
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if (error) {
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xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
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XFS_TRANS_ABORT);
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} else {
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xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
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}
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xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
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return error;
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}
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