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-rw-r--r--fs/xfs/xfs_utils.c314
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diff --git a/fs/xfs/xfs_utils.c b/fs/xfs/xfs_utils.c
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--- a/fs/xfs/xfs_utils.c
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-/*
- * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#include "xfs.h"
-#include "xfs_fs.h"
-#include "xfs_types.h"
-#include "xfs_log.h"
-#include "xfs_trans.h"
-#include "xfs_sb.h"
-#include "xfs_ag.h"
-#include "xfs_dir2.h"
-#include "xfs_mount.h"
-#include "xfs_bmap_btree.h"
-#include "xfs_dinode.h"
-#include "xfs_inode.h"
-#include "xfs_inode_item.h"
-#include "xfs_bmap.h"
-#include "xfs_error.h"
-#include "xfs_quota.h"
-#include "xfs_itable.h"
-#include "xfs_utils.h"
-
-
-/*
- * Allocates a new inode from disk and return a pointer to the
- * incore copy. This routine will internally commit the current
- * transaction and allocate a new one if the Space Manager needed
- * to do an allocation to replenish the inode free-list.
- *
- * This routine is designed to be called from xfs_create and
- * xfs_create_dir.
- *
- */
-int
-xfs_dir_ialloc(
- xfs_trans_t **tpp, /* input: current transaction;
- output: may be a new transaction. */
- xfs_inode_t *dp, /* directory within whose allocate
- the inode. */
- umode_t mode,
- xfs_nlink_t nlink,
- xfs_dev_t rdev,
- prid_t prid, /* project id */
- int okalloc, /* ok to allocate new space */
- xfs_inode_t **ipp, /* pointer to inode; it will be
- locked. */
- int *committed)
-
-{
- xfs_trans_t *tp;
- xfs_trans_t *ntp;
- xfs_inode_t *ip;
- xfs_buf_t *ialloc_context = NULL;
- int code;
- uint log_res;
- uint log_count;
- void *dqinfo;
- uint tflags;
-
- tp = *tpp;
- ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
-
- /*
- * xfs_ialloc will return a pointer to an incore inode if
- * the Space Manager has an available inode on the free
- * list. Otherwise, it will do an allocation and replenish
- * the freelist. Since we can only do one allocation per
- * transaction without deadlocks, we will need to commit the
- * current transaction and start a new one. We will then
- * need to call xfs_ialloc again to get the inode.
- *
- * If xfs_ialloc did an allocation to replenish the freelist,
- * it returns the bp containing the head of the freelist as
- * ialloc_context. We will hold a lock on it across the
- * transaction commit so that no other process can steal
- * the inode(s) that we've just allocated.
- */
- code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, okalloc,
- &ialloc_context, &ip);
-
- /*
- * Return an error if we were unable to allocate a new inode.
- * This should only happen if we run out of space on disk or
- * encounter a disk error.
- */
- if (code) {
- *ipp = NULL;
- return code;
- }
- if (!ialloc_context && !ip) {
- *ipp = NULL;
- return XFS_ERROR(ENOSPC);
- }
-
- /*
- * If the AGI buffer is non-NULL, then we were unable to get an
- * inode in one operation. We need to commit the current
- * transaction and call xfs_ialloc() again. It is guaranteed
- * to succeed the second time.
- */
- if (ialloc_context) {
- /*
- * Normally, xfs_trans_commit releases all the locks.
- * We call bhold to hang on to the ialloc_context across
- * the commit. Holding this buffer prevents any other
- * processes from doing any allocations in this
- * allocation group.
- */
- xfs_trans_bhold(tp, ialloc_context);
- /*
- * Save the log reservation so we can use
- * them in the next transaction.
- */
- log_res = xfs_trans_get_log_res(tp);
- log_count = xfs_trans_get_log_count(tp);
-
- /*
- * We want the quota changes to be associated with the next
- * transaction, NOT this one. So, detach the dqinfo from this
- * and attach it to the next transaction.
- */
- dqinfo = NULL;
- tflags = 0;
- if (tp->t_dqinfo) {
- dqinfo = (void *)tp->t_dqinfo;
- tp->t_dqinfo = NULL;
- tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
- tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
- }
-
- ntp = xfs_trans_dup(tp);
- code = xfs_trans_commit(tp, 0);
- tp = ntp;
- if (committed != NULL) {
- *committed = 1;
- }
- /*
- * If we get an error during the commit processing,
- * release the buffer that is still held and return
- * to the caller.
- */
- if (code) {
- xfs_buf_relse(ialloc_context);
- if (dqinfo) {
- tp->t_dqinfo = dqinfo;
- xfs_trans_free_dqinfo(tp);
- }
- *tpp = ntp;
- *ipp = NULL;
- return code;
- }
-
- /*
- * transaction commit worked ok so we can drop the extra ticket
- * reference that we gained in xfs_trans_dup()
- */
- xfs_log_ticket_put(tp->t_ticket);
- code = xfs_trans_reserve(tp, 0, log_res, 0,
- XFS_TRANS_PERM_LOG_RES, log_count);
- /*
- * Re-attach the quota info that we detached from prev trx.
- */
- if (dqinfo) {
- tp->t_dqinfo = dqinfo;
- tp->t_flags |= tflags;
- }
-
- if (code) {
- xfs_buf_relse(ialloc_context);
- *tpp = ntp;
- *ipp = NULL;
- return code;
- }
- xfs_trans_bjoin(tp, ialloc_context);
-
- /*
- * Call ialloc again. Since we've locked out all
- * other allocations in this allocation group,
- * this call should always succeed.
- */
- code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid,
- okalloc, &ialloc_context, &ip);
-
- /*
- * If we get an error at this point, return to the caller
- * so that the current transaction can be aborted.
- */
- if (code) {
- *tpp = tp;
- *ipp = NULL;
- return code;
- }
- ASSERT(!ialloc_context && ip);
-
- } else {
- if (committed != NULL)
- *committed = 0;
- }
-
- *ipp = ip;
- *tpp = tp;
-
- return 0;
-}
-
-/*
- * Decrement the link count on an inode & log the change.
- * If this causes the link count to go to zero, initiate the
- * logging activity required to truncate a file.
- */
-int /* error */
-xfs_droplink(
- xfs_trans_t *tp,
- xfs_inode_t *ip)
-{
- int error;
-
- xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
-
- ASSERT (ip->i_d.di_nlink > 0);
- ip->i_d.di_nlink--;
- drop_nlink(VFS_I(ip));
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
-
- error = 0;
- if (ip->i_d.di_nlink == 0) {
- /*
- * We're dropping the last link to this file.
- * Move the on-disk inode to the AGI unlinked list.
- * From xfs_inactive() we will pull the inode from
- * the list and free it.
- */
- error = xfs_iunlink(tp, ip);
- }
- return error;
-}
-
-/*
- * This gets called when the inode's version needs to be changed from 1 to 2.
- * Currently this happens when the nlink field overflows the old 16-bit value
- * or when chproj is called to change the project for the first time.
- * As a side effect the superblock version will also get rev'd
- * to contain the NLINK bit.
- */
-void
-xfs_bump_ino_vers2(
- xfs_trans_t *tp,
- xfs_inode_t *ip)
-{
- xfs_mount_t *mp;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
- ASSERT(ip->i_d.di_version == 1);
-
- ip->i_d.di_version = 2;
- ip->i_d.di_onlink = 0;
- memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
- mp = tp->t_mountp;
- if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
- spin_lock(&mp->m_sb_lock);
- if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
- xfs_sb_version_addnlink(&mp->m_sb);
- spin_unlock(&mp->m_sb_lock);
- xfs_mod_sb(tp, XFS_SB_VERSIONNUM);
- } else {
- spin_unlock(&mp->m_sb_lock);
- }
- }
- /* Caller must log the inode */
-}
-
-/*
- * Increment the link count on an inode & log the change.
- */
-int
-xfs_bumplink(
- xfs_trans_t *tp,
- xfs_inode_t *ip)
-{
- xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
-
- ASSERT(ip->i_d.di_nlink > 0);
- ip->i_d.di_nlink++;
- inc_nlink(VFS_I(ip));
- if ((ip->i_d.di_version == 1) &&
- (ip->i_d.di_nlink > XFS_MAXLINK_1)) {
- /*
- * The inode has increased its number of links beyond
- * what can fit in an old format inode. It now needs
- * to be converted to a version 2 inode with a 32 bit
- * link count. If this is the first inode in the file
- * system to do this, then we need to bump the superblock
- * version number as well.
- */
- xfs_bump_ino_vers2(tp, ip);
- }
-
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- return 0;
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.