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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; boolean_t call_again = B_FALSE; 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, &call_again, &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 (!call_again && (ip == NULL)) { *ipp = NULL; return XFS_ERROR(ENOSPC); } /* * If call_again is set, 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 (call_again) { /* * 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, &call_again, &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 ((!call_again) && (ip != NULL)); } 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; }
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