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b52a360b2a
Fixes a possible memory corruption when the link is larger than MAXPATHLEN and XFS_DEBUG is not enabled. This also remove the S_ISLNK assert, since the inode mode is checked previously in xfs_readlink_by_handle() and via VFS. Updated to address concerns raised by Ben Hutchings about the loose attention paid to 32- vs 64-bit values, and the lack of handling a potentially negative pathlen value: - Changed type of "pathlen" to be xfs_fsize_t, to match that of ip->i_d.di_size - Added checking for a negative pathlen to the too-long pathlen test, and generalized the message that gets reported in that case to reflect the change As a result, if a negative pathlen were encountered, this function would return EFSCORRUPTED (and would fail an assertion for a debug build)--just as would a too-long pathlen. Signed-off-by: Alex Elder <aelder@sgi.com> Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2384 lines
57 KiB
C
2384 lines
57 KiB
C
/*
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* Copyright (c) 2000-2006 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_mount.h"
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#include "xfs_da_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_ialloc_btree.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_itable.h"
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#include "xfs_ialloc.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_acl.h"
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#include "xfs_attr.h"
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#include "xfs_rw.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_utils.h"
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#include "xfs_rtalloc.h"
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#include "xfs_trans_space.h"
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#include "xfs_log_priv.h"
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#include "xfs_filestream.h"
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#include "xfs_vnodeops.h"
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#include "xfs_trace.h"
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/*
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* The maximum pathlen is 1024 bytes. Since the minimum file system
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* blocksize is 512 bytes, we can get a max of 2 extents back from
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* bmapi.
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*/
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#define SYMLINK_MAPS 2
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STATIC int
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xfs_readlink_bmap(
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xfs_inode_t *ip,
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char *link)
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{
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xfs_mount_t *mp = ip->i_mount;
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int pathlen = ip->i_d.di_size;
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int nmaps = SYMLINK_MAPS;
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xfs_bmbt_irec_t mval[SYMLINK_MAPS];
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xfs_daddr_t d;
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int byte_cnt;
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int n;
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xfs_buf_t *bp;
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int error = 0;
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error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
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0);
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if (error)
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goto out;
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for (n = 0; n < nmaps; n++) {
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d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
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byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
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bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt),
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XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK);
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if (!bp)
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return XFS_ERROR(ENOMEM);
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error = bp->b_error;
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if (error) {
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xfs_buf_ioerror_alert(bp, __func__);
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xfs_buf_relse(bp);
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goto out;
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}
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if (pathlen < byte_cnt)
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byte_cnt = pathlen;
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pathlen -= byte_cnt;
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memcpy(link, bp->b_addr, byte_cnt);
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xfs_buf_relse(bp);
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}
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link[ip->i_d.di_size] = '\0';
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error = 0;
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out:
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return error;
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}
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int
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xfs_readlink(
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xfs_inode_t *ip,
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char *link)
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{
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xfs_mount_t *mp = ip->i_mount;
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xfs_fsize_t pathlen;
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int error = 0;
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trace_xfs_readlink(ip);
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if (XFS_FORCED_SHUTDOWN(mp))
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return XFS_ERROR(EIO);
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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pathlen = ip->i_d.di_size;
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if (!pathlen)
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goto out;
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if (pathlen < 0 || pathlen > MAXPATHLEN) {
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xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
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__func__, (unsigned long long) ip->i_ino,
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(long long) pathlen);
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ASSERT(0);
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return XFS_ERROR(EFSCORRUPTED);
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}
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if (ip->i_df.if_flags & XFS_IFINLINE) {
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memcpy(link, ip->i_df.if_u1.if_data, pathlen);
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link[pathlen] = '\0';
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} else {
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error = xfs_readlink_bmap(ip, link);
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}
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out:
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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return error;
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}
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/*
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* Flags for xfs_free_eofblocks
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*/
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#define XFS_FREE_EOF_TRYLOCK (1<<0)
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/*
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* This is called by xfs_inactive to free any blocks beyond eof
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* when the link count isn't zero and by xfs_dm_punch_hole() when
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* punching a hole to EOF.
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*/
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STATIC int
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xfs_free_eofblocks(
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xfs_mount_t *mp,
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xfs_inode_t *ip,
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int flags)
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{
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xfs_trans_t *tp;
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int error;
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xfs_fileoff_t end_fsb;
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xfs_fileoff_t last_fsb;
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xfs_filblks_t map_len;
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int nimaps;
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xfs_bmbt_irec_t imap;
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/*
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* Figure out if there are any blocks beyond the end
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* of the file. If not, then there is nothing to do.
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*/
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end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
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last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
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if (last_fsb <= end_fsb)
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return 0;
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map_len = last_fsb - end_fsb;
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nimaps = 1;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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if (!error && (nimaps != 0) &&
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(imap.br_startblock != HOLESTARTBLOCK ||
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ip->i_delayed_blks)) {
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/*
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* Attach the dquots to the inode up front.
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*/
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error = xfs_qm_dqattach(ip, 0);
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if (error)
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return error;
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/*
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* There are blocks after the end of file.
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* Free them up now by truncating the file to
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* its current size.
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*/
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tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
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if (flags & XFS_FREE_EOF_TRYLOCK) {
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if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
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xfs_trans_cancel(tp, 0);
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return 0;
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}
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} else {
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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}
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error = xfs_trans_reserve(tp, 0,
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XFS_ITRUNCATE_LOG_RES(mp),
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0, XFS_TRANS_PERM_LOG_RES,
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XFS_ITRUNCATE_LOG_COUNT);
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if (error) {
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ASSERT(XFS_FORCED_SHUTDOWN(mp));
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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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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, 0);
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error = xfs_itruncate_data(&tp, ip, ip->i_size);
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if (error) {
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/*
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* If we get an error at this point we simply don't
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* bother truncating the file.
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*/
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xfs_trans_cancel(tp,
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(XFS_TRANS_RELEASE_LOG_RES |
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XFS_TRANS_ABORT));
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} else {
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error = xfs_trans_commit(tp,
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XFS_TRANS_RELEASE_LOG_RES);
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}
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xfs_iunlock(ip, XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL);
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}
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return error;
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}
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/*
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* Free a symlink that has blocks associated with it.
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*/
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STATIC int
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xfs_inactive_symlink_rmt(
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xfs_inode_t *ip,
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xfs_trans_t **tpp)
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{
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xfs_buf_t *bp;
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int committed;
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int done;
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int error;
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xfs_fsblock_t first_block;
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xfs_bmap_free_t free_list;
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int i;
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xfs_mount_t *mp;
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xfs_bmbt_irec_t mval[SYMLINK_MAPS];
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int nmaps;
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xfs_trans_t *ntp;
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int size;
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xfs_trans_t *tp;
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tp = *tpp;
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mp = ip->i_mount;
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ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
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/*
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* We're freeing a symlink that has some
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* blocks allocated to it. Free the
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* blocks here. We know that we've got
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* either 1 or 2 extents and that we can
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* free them all in one bunmapi call.
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*/
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ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
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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, XFS_ITRUNCATE_LOG_COUNT))) {
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ASSERT(XFS_FORCED_SHUTDOWN(mp));
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xfs_trans_cancel(tp, 0);
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*tpp = NULL;
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return error;
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}
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/*
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* Lock the inode, fix the size, and join it to the transaction.
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* Hold it so in the normal path, we still have it locked for
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* the second transaction. In the error paths we need it
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* held so the cancel won't rele it, see below.
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*/
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xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
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size = (int)ip->i_d.di_size;
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ip->i_d.di_size = 0;
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xfs_trans_ijoin(tp, ip, 0);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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/*
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* Find the block(s) so we can inval and unmap them.
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*/
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done = 0;
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xfs_bmap_init(&free_list, &first_block);
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nmaps = ARRAY_SIZE(mval);
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error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
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mval, &nmaps, 0);
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if (error)
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goto error0;
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/*
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* Invalidate the block(s).
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*/
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for (i = 0; i < nmaps; i++) {
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bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
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XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
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XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
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if (!bp) {
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error = ENOMEM;
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goto error1;
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}
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xfs_trans_binval(tp, bp);
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}
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/*
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* Unmap the dead block(s) to the free_list.
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*/
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if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
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&first_block, &free_list, &done)))
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goto error1;
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ASSERT(done);
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/*
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* Commit the first transaction. This logs the EFI and the inode.
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*/
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if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
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goto error1;
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/*
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* The transaction must have been committed, since there were
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* actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
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* The new tp has the extent freeing and EFDs.
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*/
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ASSERT(committed);
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/*
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* The first xact was committed, so add the inode to the new one.
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* Mark it dirty so it will be logged and moved forward in the log as
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* part of every commit.
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*/
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xfs_trans_ijoin(tp, ip, 0);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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/*
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* Get a new, empty transaction to return to our caller.
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*/
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ntp = xfs_trans_dup(tp);
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/*
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* Commit the transaction containing extent freeing and EFDs.
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* If we get an error on the commit here or on the reserve below,
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* we need to unlock the inode since the new transaction doesn't
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* have the inode attached.
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*/
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error = xfs_trans_commit(tp, 0);
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tp = ntp;
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if (error) {
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ASSERT(XFS_FORCED_SHUTDOWN(mp));
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goto error0;
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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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|
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/*
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* Remove the memory for extent descriptions (just bookkeeping).
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*/
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if (ip->i_df.if_bytes)
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xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
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ASSERT(ip->i_df.if_bytes == 0);
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/*
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* Put an itruncate log reservation in the new transaction
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* for our caller.
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*/
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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, XFS_ITRUNCATE_LOG_COUNT))) {
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ASSERT(XFS_FORCED_SHUTDOWN(mp));
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goto error0;
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}
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/*
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* Return with the inode locked but not joined to the transaction.
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*/
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*tpp = tp;
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return 0;
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|
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error1:
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xfs_bmap_cancel(&free_list);
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error0:
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/*
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* Have to come here with the inode locked and either
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* (held and in the transaction) or (not in the transaction).
|
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* If the inode isn't held then cancel would iput it, but
|
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* that's wrong since this is inactive and the vnode ref
|
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* count is 0 already.
|
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* Cancel won't do anything to the inode if held, but it still
|
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* needs to be locked until the cancel is done, if it was
|
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* joined to the transaction.
|
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*/
|
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xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
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xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
|
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*tpp = NULL;
|
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return error;
|
|
|
|
}
|
|
|
|
STATIC int
|
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xfs_inactive_symlink_local(
|
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xfs_inode_t *ip,
|
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xfs_trans_t **tpp)
|
|
{
|
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int error;
|
|
|
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ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
|
|
/*
|
|
* We're freeing a symlink which fit into
|
|
* the inode. Just free the memory used
|
|
* to hold the old symlink.
|
|
*/
|
|
error = xfs_trans_reserve(*tpp, 0,
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XFS_ITRUNCATE_LOG_RES(ip->i_mount),
|
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0, XFS_TRANS_PERM_LOG_RES,
|
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XFS_ITRUNCATE_LOG_COUNT);
|
|
|
|
if (error) {
|
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xfs_trans_cancel(*tpp, 0);
|
|
*tpp = NULL;
|
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return error;
|
|
}
|
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xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
|
|
|
|
/*
|
|
* Zero length symlinks _can_ exist.
|
|
*/
|
|
if (ip->i_df.if_bytes > 0) {
|
|
xfs_idata_realloc(ip,
|
|
-(ip->i_df.if_bytes),
|
|
XFS_DATA_FORK);
|
|
ASSERT(ip->i_df.if_bytes == 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_inactive_attrs(
|
|
xfs_inode_t *ip,
|
|
xfs_trans_t **tpp)
|
|
{
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
xfs_mount_t *mp;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
tp = *tpp;
|
|
mp = ip->i_mount;
|
|
ASSERT(ip->i_d.di_forkoff != 0);
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
if (error)
|
|
goto error_unlock;
|
|
|
|
error = xfs_attr_inactive(ip);
|
|
if (error)
|
|
goto error_unlock;
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
|
|
error = xfs_trans_reserve(tp, 0,
|
|
XFS_IFREE_LOG_RES(mp),
|
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0, XFS_TRANS_PERM_LOG_RES,
|
|
XFS_INACTIVE_LOG_COUNT);
|
|
if (error)
|
|
goto error_cancel;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
xfs_idestroy_fork(ip, XFS_ATTR_FORK);
|
|
|
|
ASSERT(ip->i_d.di_anextents == 0);
|
|
|
|
*tpp = tp;
|
|
return 0;
|
|
|
|
error_cancel:
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
xfs_trans_cancel(tp, 0);
|
|
error_unlock:
|
|
*tpp = NULL;
|
|
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_release(
|
|
xfs_inode_t *ip)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
int error;
|
|
|
|
if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
|
|
return 0;
|
|
|
|
/* If this is a read-only mount, don't do this (would generate I/O) */
|
|
if (mp->m_flags & XFS_MOUNT_RDONLY)
|
|
return 0;
|
|
|
|
if (!XFS_FORCED_SHUTDOWN(mp)) {
|
|
int truncated;
|
|
|
|
/*
|
|
* If we are using filestreams, and we have an unlinked
|
|
* file that we are processing the last close on, then nothing
|
|
* will be able to reopen and write to this file. Purge this
|
|
* inode from the filestreams cache so that it doesn't delay
|
|
* teardown of the inode.
|
|
*/
|
|
if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
|
|
xfs_filestream_deassociate(ip);
|
|
|
|
/*
|
|
* If we previously truncated this file and removed old data
|
|
* in the process, we want to initiate "early" writeout on
|
|
* the last close. This is an attempt to combat the notorious
|
|
* NULL files problem which is particularly noticeable from a
|
|
* truncate down, buffered (re-)write (delalloc), followed by
|
|
* a crash. What we are effectively doing here is
|
|
* significantly reducing the time window where we'd otherwise
|
|
* be exposed to that problem.
|
|
*/
|
|
truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
|
|
if (truncated) {
|
|
xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
|
|
if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
|
|
xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
|
|
}
|
|
}
|
|
|
|
if (ip->i_d.di_nlink == 0)
|
|
return 0;
|
|
|
|
if ((S_ISREG(ip->i_d.di_mode) &&
|
|
((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
|
|
ip->i_delayed_blks > 0)) &&
|
|
(ip->i_df.if_flags & XFS_IFEXTENTS)) &&
|
|
(!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
|
|
|
|
/*
|
|
* If we can't get the iolock just skip truncating the blocks
|
|
* past EOF because we could deadlock with the mmap_sem
|
|
* otherwise. We'll get another chance to drop them once the
|
|
* last reference to the inode is dropped, so we'll never leak
|
|
* blocks permanently.
|
|
*
|
|
* Further, check if the inode is being opened, written and
|
|
* closed frequently and we have delayed allocation blocks
|
|
* outstanding (e.g. streaming writes from the NFS server),
|
|
* truncating the blocks past EOF will cause fragmentation to
|
|
* occur.
|
|
*
|
|
* In this case don't do the truncation, either, but we have to
|
|
* be careful how we detect this case. Blocks beyond EOF show
|
|
* up as i_delayed_blks even when the inode is clean, so we
|
|
* need to truncate them away first before checking for a dirty
|
|
* release. Hence on the first dirty close we will still remove
|
|
* the speculative allocation, but after that we will leave it
|
|
* in place.
|
|
*/
|
|
if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
|
|
return 0;
|
|
|
|
error = xfs_free_eofblocks(mp, ip,
|
|
XFS_FREE_EOF_TRYLOCK);
|
|
if (error)
|
|
return error;
|
|
|
|
/* delalloc blocks after truncation means it really is dirty */
|
|
if (ip->i_delayed_blks)
|
|
xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* xfs_inactive
|
|
*
|
|
* This is called when the vnode reference count for the vnode
|
|
* goes to zero. If the file has been unlinked, then it must
|
|
* now be truncated. Also, we clear all of the read-ahead state
|
|
* kept for the inode here since the file is now closed.
|
|
*/
|
|
int
|
|
xfs_inactive(
|
|
xfs_inode_t *ip)
|
|
{
|
|
xfs_bmap_free_t free_list;
|
|
xfs_fsblock_t first_block;
|
|
int committed;
|
|
xfs_trans_t *tp;
|
|
xfs_mount_t *mp;
|
|
int error;
|
|
int truncate;
|
|
|
|
/*
|
|
* If the inode is already free, then there can be nothing
|
|
* to clean up here.
|
|
*/
|
|
if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
|
|
ASSERT(ip->i_df.if_real_bytes == 0);
|
|
ASSERT(ip->i_df.if_broot_bytes == 0);
|
|
return VN_INACTIVE_CACHE;
|
|
}
|
|
|
|
/*
|
|
* Only do a truncate if it's a regular file with
|
|
* some actual space in it. It's OK to look at the
|
|
* inode's fields without the lock because we're the
|
|
* only one with a reference to the inode.
|
|
*/
|
|
truncate = ((ip->i_d.di_nlink == 0) &&
|
|
((ip->i_d.di_size != 0) || (ip->i_size != 0) ||
|
|
(ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
|
|
S_ISREG(ip->i_d.di_mode));
|
|
|
|
mp = ip->i_mount;
|
|
|
|
error = 0;
|
|
|
|
/* If this is a read-only mount, don't do this (would generate I/O) */
|
|
if (mp->m_flags & XFS_MOUNT_RDONLY)
|
|
goto out;
|
|
|
|
if (ip->i_d.di_nlink != 0) {
|
|
if ((S_ISREG(ip->i_d.di_mode) &&
|
|
((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
|
|
ip->i_delayed_blks > 0)) &&
|
|
(ip->i_df.if_flags & XFS_IFEXTENTS) &&
|
|
(!(ip->i_d.di_flags &
|
|
(XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
|
|
(ip->i_delayed_blks != 0)))) {
|
|
error = xfs_free_eofblocks(mp, ip, 0);
|
|
if (error)
|
|
return VN_INACTIVE_CACHE;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
ASSERT(ip->i_d.di_nlink == 0);
|
|
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return VN_INACTIVE_CACHE;
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
|
|
if (truncate) {
|
|
xfs_ilock(ip, XFS_IOLOCK_EXCL);
|
|
|
|
error = xfs_trans_reserve(tp, 0,
|
|
XFS_ITRUNCATE_LOG_RES(mp),
|
|
0, XFS_TRANS_PERM_LOG_RES,
|
|
XFS_ITRUNCATE_LOG_COUNT);
|
|
if (error) {
|
|
/* Don't call itruncate_cleanup */
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
xfs_trans_cancel(tp, 0);
|
|
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
|
return VN_INACTIVE_CACHE;
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
error = xfs_itruncate_data(&tp, ip, 0);
|
|
if (error) {
|
|
xfs_trans_cancel(tp,
|
|
XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
|
|
return VN_INACTIVE_CACHE;
|
|
}
|
|
} else if (S_ISLNK(ip->i_d.di_mode)) {
|
|
|
|
/*
|
|
* If we get an error while cleaning up a
|
|
* symlink we bail out.
|
|
*/
|
|
error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
|
|
xfs_inactive_symlink_rmt(ip, &tp) :
|
|
xfs_inactive_symlink_local(ip, &tp);
|
|
|
|
if (error) {
|
|
ASSERT(tp == NULL);
|
|
return VN_INACTIVE_CACHE;
|
|
}
|
|
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
} else {
|
|
error = xfs_trans_reserve(tp, 0,
|
|
XFS_IFREE_LOG_RES(mp),
|
|
0, XFS_TRANS_PERM_LOG_RES,
|
|
XFS_INACTIVE_LOG_COUNT);
|
|
if (error) {
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
xfs_trans_cancel(tp, 0);
|
|
return VN_INACTIVE_CACHE;
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
}
|
|
|
|
/*
|
|
* If there are attributes associated with the file
|
|
* then blow them away now. The code calls a routine
|
|
* that recursively deconstructs the attribute fork.
|
|
* We need to just commit the current transaction
|
|
* because we can't use it for xfs_attr_inactive().
|
|
*/
|
|
if (ip->i_d.di_anextents > 0) {
|
|
error = xfs_inactive_attrs(ip, &tp);
|
|
/*
|
|
* If we got an error, the transaction is already
|
|
* cancelled, and the inode is unlocked. Just get out.
|
|
*/
|
|
if (error)
|
|
return VN_INACTIVE_CACHE;
|
|
} else if (ip->i_afp) {
|
|
xfs_idestroy_fork(ip, XFS_ATTR_FORK);
|
|
}
|
|
|
|
/*
|
|
* Free the inode.
|
|
*/
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
error = xfs_ifree(tp, ip, &free_list);
|
|
if (error) {
|
|
/*
|
|
* If we fail to free the inode, shut down. The cancel
|
|
* might do that, we need to make sure. Otherwise the
|
|
* inode might be lost for a long time or forever.
|
|
*/
|
|
if (!XFS_FORCED_SHUTDOWN(mp)) {
|
|
xfs_notice(mp, "%s: xfs_ifree returned error %d",
|
|
__func__, error);
|
|
xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
|
|
}
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
|
|
} else {
|
|
/*
|
|
* Credit the quota account(s). The inode is gone.
|
|
*/
|
|
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
|
|
|
|
/*
|
|
* Just ignore errors at this point. There is nothing we can
|
|
* do except to try to keep going. Make sure it's not a silent
|
|
* error.
|
|
*/
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
|
|
__func__, error);
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
|
|
__func__, error);
|
|
}
|
|
|
|
/*
|
|
* Release the dquots held by inode, if any.
|
|
*/
|
|
xfs_qm_dqdetach(ip);
|
|
xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
|
|
|
|
out:
|
|
return VN_INACTIVE_CACHE;
|
|
}
|
|
|
|
/*
|
|
* Lookups up an inode from "name". If ci_name is not NULL, then a CI match
|
|
* is allowed, otherwise it has to be an exact match. If a CI match is found,
|
|
* ci_name->name will point to a the actual name (caller must free) or
|
|
* will be set to NULL if an exact match is found.
|
|
*/
|
|
int
|
|
xfs_lookup(
|
|
xfs_inode_t *dp,
|
|
struct xfs_name *name,
|
|
xfs_inode_t **ipp,
|
|
struct xfs_name *ci_name)
|
|
{
|
|
xfs_ino_t inum;
|
|
int error;
|
|
uint lock_mode;
|
|
|
|
trace_xfs_lookup(dp, name);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
|
|
return XFS_ERROR(EIO);
|
|
|
|
lock_mode = xfs_ilock_map_shared(dp);
|
|
error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
|
|
xfs_iunlock_map_shared(dp, lock_mode);
|
|
|
|
if (error)
|
|
goto out;
|
|
|
|
error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
|
|
if (error)
|
|
goto out_free_name;
|
|
|
|
return 0;
|
|
|
|
out_free_name:
|
|
if (ci_name)
|
|
kmem_free(ci_name->name);
|
|
out:
|
|
*ipp = NULL;
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_create(
|
|
xfs_inode_t *dp,
|
|
struct xfs_name *name,
|
|
mode_t mode,
|
|
xfs_dev_t rdev,
|
|
xfs_inode_t **ipp)
|
|
{
|
|
int is_dir = S_ISDIR(mode);
|
|
struct xfs_mount *mp = dp->i_mount;
|
|
struct xfs_inode *ip = NULL;
|
|
struct xfs_trans *tp = NULL;
|
|
int error;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_fsblock_t first_block;
|
|
boolean_t unlock_dp_on_error = B_FALSE;
|
|
uint cancel_flags;
|
|
int committed;
|
|
prid_t prid;
|
|
struct xfs_dquot *udqp = NULL;
|
|
struct xfs_dquot *gdqp = NULL;
|
|
uint resblks;
|
|
uint log_res;
|
|
uint log_count;
|
|
|
|
trace_xfs_create(dp, name);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return XFS_ERROR(EIO);
|
|
|
|
if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
|
|
prid = xfs_get_projid(dp);
|
|
else
|
|
prid = XFS_PROJID_DEFAULT;
|
|
|
|
/*
|
|
* Make sure that we have allocated dquot(s) on disk.
|
|
*/
|
|
error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
|
|
XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
|
|
if (error)
|
|
return error;
|
|
|
|
if (is_dir) {
|
|
rdev = 0;
|
|
resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
|
|
log_res = XFS_MKDIR_LOG_RES(mp);
|
|
log_count = XFS_MKDIR_LOG_COUNT;
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
|
|
} else {
|
|
resblks = XFS_CREATE_SPACE_RES(mp, name->len);
|
|
log_res = XFS_CREATE_LOG_RES(mp);
|
|
log_count = XFS_CREATE_LOG_COUNT;
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
|
|
}
|
|
|
|
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
|
|
|
|
/*
|
|
* Initially assume that the file does not exist and
|
|
* reserve the resources for that case. If that is not
|
|
* the case we'll drop the one we have and get a more
|
|
* appropriate transaction later.
|
|
*/
|
|
error = xfs_trans_reserve(tp, resblks, log_res, 0,
|
|
XFS_TRANS_PERM_LOG_RES, log_count);
|
|
if (error == ENOSPC) {
|
|
/* flush outstanding delalloc blocks and retry */
|
|
xfs_flush_inodes(dp);
|
|
error = xfs_trans_reserve(tp, resblks, log_res, 0,
|
|
XFS_TRANS_PERM_LOG_RES, log_count);
|
|
}
|
|
if (error == ENOSPC) {
|
|
/* No space at all so try a "no-allocation" reservation */
|
|
resblks = 0;
|
|
error = xfs_trans_reserve(tp, 0, log_res, 0,
|
|
XFS_TRANS_PERM_LOG_RES, log_count);
|
|
}
|
|
if (error) {
|
|
cancel_flags = 0;
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
|
|
unlock_dp_on_error = B_TRUE;
|
|
|
|
/*
|
|
* Check for directory link count overflow.
|
|
*/
|
|
if (is_dir && dp->i_d.di_nlink >= XFS_MAXLINK) {
|
|
error = XFS_ERROR(EMLINK);
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
|
|
/*
|
|
* Reserve disk quota and the inode.
|
|
*/
|
|
error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
error = xfs_dir_canenter(tp, dp, name, resblks);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
/*
|
|
* A newly created regular or special file just has one directory
|
|
* entry pointing to them, but a directory also the "." entry
|
|
* pointing to itself.
|
|
*/
|
|
error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
|
|
prid, resblks > 0, &ip, &committed);
|
|
if (error) {
|
|
if (error == ENOSPC)
|
|
goto out_trans_cancel;
|
|
goto out_trans_abort;
|
|
}
|
|
|
|
/*
|
|
* Now we join the directory inode to the transaction. We do not do it
|
|
* earlier because xfs_dir_ialloc might commit the previous transaction
|
|
* (and release all the locks). An error from here on will result in
|
|
* the transaction cancel unlocking dp so don't do it explicitly in the
|
|
* error path.
|
|
*/
|
|
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
|
|
unlock_dp_on_error = B_FALSE;
|
|
|
|
error = xfs_dir_createname(tp, dp, name, ip->i_ino,
|
|
&first_block, &free_list, resblks ?
|
|
resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
|
|
if (error) {
|
|
ASSERT(error != ENOSPC);
|
|
goto out_trans_abort;
|
|
}
|
|
xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
|
|
|
|
if (is_dir) {
|
|
error = xfs_dir_init(tp, ip, dp);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
error = xfs_bumplink(tp, dp);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
}
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* create transaction goes to disk before returning to
|
|
* the user.
|
|
*/
|
|
if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
|
|
xfs_trans_set_sync(tp);
|
|
|
|
/*
|
|
* Attach the dquot(s) to the inodes and modify them incore.
|
|
* These ids of the inode couldn't have changed since the new
|
|
* inode has been locked ever since it was created.
|
|
*/
|
|
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto out_release_inode;
|
|
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
|
|
*ipp = ip;
|
|
return 0;
|
|
|
|
out_bmap_cancel:
|
|
xfs_bmap_cancel(&free_list);
|
|
out_trans_abort:
|
|
cancel_flags |= XFS_TRANS_ABORT;
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp, cancel_flags);
|
|
out_release_inode:
|
|
/*
|
|
* Wait until after the current transaction is aborted to
|
|
* release the inode. This prevents recursive transactions
|
|
* and deadlocks from xfs_inactive.
|
|
*/
|
|
if (ip)
|
|
IRELE(ip);
|
|
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
|
|
if (unlock_dp_on_error)
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
int xfs_locked_n;
|
|
int xfs_small_retries;
|
|
int xfs_middle_retries;
|
|
int xfs_lots_retries;
|
|
int xfs_lock_delays;
|
|
#endif
|
|
|
|
/*
|
|
* Bump the subclass so xfs_lock_inodes() acquires each lock with
|
|
* a different value
|
|
*/
|
|
static inline int
|
|
xfs_lock_inumorder(int lock_mode, int subclass)
|
|
{
|
|
if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
|
|
lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
|
|
if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
|
|
lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
|
|
|
|
return lock_mode;
|
|
}
|
|
|
|
/*
|
|
* The following routine will lock n inodes in exclusive mode.
|
|
* We assume the caller calls us with the inodes in i_ino order.
|
|
*
|
|
* We need to detect deadlock where an inode that we lock
|
|
* is in the AIL and we start waiting for another inode that is locked
|
|
* by a thread in a long running transaction (such as truncate). This can
|
|
* result in deadlock since the long running trans might need to wait
|
|
* for the inode we just locked in order to push the tail and free space
|
|
* in the log.
|
|
*/
|
|
void
|
|
xfs_lock_inodes(
|
|
xfs_inode_t **ips,
|
|
int inodes,
|
|
uint lock_mode)
|
|
{
|
|
int attempts = 0, i, j, try_lock;
|
|
xfs_log_item_t *lp;
|
|
|
|
ASSERT(ips && (inodes >= 2)); /* we need at least two */
|
|
|
|
try_lock = 0;
|
|
i = 0;
|
|
|
|
again:
|
|
for (; i < inodes; i++) {
|
|
ASSERT(ips[i]);
|
|
|
|
if (i && (ips[i] == ips[i-1])) /* Already locked */
|
|
continue;
|
|
|
|
/*
|
|
* If try_lock is not set yet, make sure all locked inodes
|
|
* are not in the AIL.
|
|
* If any are, set try_lock to be used later.
|
|
*/
|
|
|
|
if (!try_lock) {
|
|
for (j = (i - 1); j >= 0 && !try_lock; j--) {
|
|
lp = (xfs_log_item_t *)ips[j]->i_itemp;
|
|
if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
|
|
try_lock++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If any of the previous locks we have locked is in the AIL,
|
|
* we must TRY to get the second and subsequent locks. If
|
|
* we can't get any, we must release all we have
|
|
* and try again.
|
|
*/
|
|
|
|
if (try_lock) {
|
|
/* try_lock must be 0 if i is 0. */
|
|
/*
|
|
* try_lock means we have an inode locked
|
|
* that is in the AIL.
|
|
*/
|
|
ASSERT(i != 0);
|
|
if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
|
|
attempts++;
|
|
|
|
/*
|
|
* Unlock all previous guys and try again.
|
|
* xfs_iunlock will try to push the tail
|
|
* if the inode is in the AIL.
|
|
*/
|
|
|
|
for(j = i - 1; j >= 0; j--) {
|
|
|
|
/*
|
|
* Check to see if we've already
|
|
* unlocked this one.
|
|
* Not the first one going back,
|
|
* and the inode ptr is the same.
|
|
*/
|
|
if ((j != (i - 1)) && ips[j] ==
|
|
ips[j+1])
|
|
continue;
|
|
|
|
xfs_iunlock(ips[j], lock_mode);
|
|
}
|
|
|
|
if ((attempts % 5) == 0) {
|
|
delay(1); /* Don't just spin the CPU */
|
|
#ifdef DEBUG
|
|
xfs_lock_delays++;
|
|
#endif
|
|
}
|
|
i = 0;
|
|
try_lock = 0;
|
|
goto again;
|
|
}
|
|
} else {
|
|
xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (attempts) {
|
|
if (attempts < 5) xfs_small_retries++;
|
|
else if (attempts < 100) xfs_middle_retries++;
|
|
else xfs_lots_retries++;
|
|
} else {
|
|
xfs_locked_n++;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* xfs_lock_two_inodes() can only be used to lock one type of lock
|
|
* at a time - the iolock or the ilock, but not both at once. If
|
|
* we lock both at once, lockdep will report false positives saying
|
|
* we have violated locking orders.
|
|
*/
|
|
void
|
|
xfs_lock_two_inodes(
|
|
xfs_inode_t *ip0,
|
|
xfs_inode_t *ip1,
|
|
uint lock_mode)
|
|
{
|
|
xfs_inode_t *temp;
|
|
int attempts = 0;
|
|
xfs_log_item_t *lp;
|
|
|
|
if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
|
|
ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
|
|
ASSERT(ip0->i_ino != ip1->i_ino);
|
|
|
|
if (ip0->i_ino > ip1->i_ino) {
|
|
temp = ip0;
|
|
ip0 = ip1;
|
|
ip1 = temp;
|
|
}
|
|
|
|
again:
|
|
xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
|
|
|
|
/*
|
|
* If the first lock we have locked is in the AIL, we must TRY to get
|
|
* the second lock. If we can't get it, we must release the first one
|
|
* and try again.
|
|
*/
|
|
lp = (xfs_log_item_t *)ip0->i_itemp;
|
|
if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
|
|
if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
|
|
xfs_iunlock(ip0, lock_mode);
|
|
if ((++attempts % 5) == 0)
|
|
delay(1); /* Don't just spin the CPU */
|
|
goto again;
|
|
}
|
|
} else {
|
|
xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
|
|
}
|
|
}
|
|
|
|
int
|
|
xfs_remove(
|
|
xfs_inode_t *dp,
|
|
struct xfs_name *name,
|
|
xfs_inode_t *ip)
|
|
{
|
|
xfs_mount_t *mp = dp->i_mount;
|
|
xfs_trans_t *tp = NULL;
|
|
int is_dir = S_ISDIR(ip->i_d.di_mode);
|
|
int error = 0;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_fsblock_t first_block;
|
|
int cancel_flags;
|
|
int committed;
|
|
int link_zero;
|
|
uint resblks;
|
|
uint log_count;
|
|
|
|
trace_xfs_remove(dp, name);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return XFS_ERROR(EIO);
|
|
|
|
error = xfs_qm_dqattach(dp, 0);
|
|
if (error)
|
|
goto std_return;
|
|
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
goto std_return;
|
|
|
|
if (is_dir) {
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
|
|
log_count = XFS_DEFAULT_LOG_COUNT;
|
|
} else {
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
|
|
log_count = XFS_REMOVE_LOG_COUNT;
|
|
}
|
|
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
|
|
|
|
/*
|
|
* We try to get the real space reservation first,
|
|
* allowing for directory btree deletion(s) implying
|
|
* possible bmap insert(s). If we can't get the space
|
|
* reservation then we use 0 instead, and avoid the bmap
|
|
* btree insert(s) in the directory code by, if the bmap
|
|
* insert tries to happen, instead trimming the LAST
|
|
* block from the directory.
|
|
*/
|
|
resblks = XFS_REMOVE_SPACE_RES(mp);
|
|
error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, log_count);
|
|
if (error == ENOSPC) {
|
|
resblks = 0;
|
|
error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, log_count);
|
|
}
|
|
if (error) {
|
|
ASSERT(error != ENOSPC);
|
|
cancel_flags = 0;
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
|
|
|
|
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* If we're removing a directory perform some additional validation.
|
|
*/
|
|
if (is_dir) {
|
|
ASSERT(ip->i_d.di_nlink >= 2);
|
|
if (ip->i_d.di_nlink != 2) {
|
|
error = XFS_ERROR(ENOTEMPTY);
|
|
goto out_trans_cancel;
|
|
}
|
|
if (!xfs_dir_isempty(ip)) {
|
|
error = XFS_ERROR(ENOTEMPTY);
|
|
goto out_trans_cancel;
|
|
}
|
|
}
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
error = xfs_dir_removename(tp, dp, name, ip->i_ino,
|
|
&first_block, &free_list, resblks);
|
|
if (error) {
|
|
ASSERT(error != ENOENT);
|
|
goto out_bmap_cancel;
|
|
}
|
|
xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
|
|
if (is_dir) {
|
|
/*
|
|
* Drop the link from ip's "..".
|
|
*/
|
|
error = xfs_droplink(tp, dp);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
/*
|
|
* Drop the "." link from ip to self.
|
|
*/
|
|
error = xfs_droplink(tp, ip);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
} else {
|
|
/*
|
|
* When removing a non-directory we need to log the parent
|
|
* inode here. For a directory this is done implicitly
|
|
* by the xfs_droplink call for the ".." entry.
|
|
*/
|
|
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
|
|
}
|
|
|
|
/*
|
|
* Drop the link from dp to ip.
|
|
*/
|
|
error = xfs_droplink(tp, ip);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
/*
|
|
* Determine if this is the last link while
|
|
* we are in the transaction.
|
|
*/
|
|
link_zero = (ip->i_d.di_nlink == 0);
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* remove transaction goes to disk before returning to
|
|
* the user.
|
|
*/
|
|
if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
|
|
xfs_trans_set_sync(tp);
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto std_return;
|
|
|
|
/*
|
|
* If we are using filestreams, kill the stream association.
|
|
* If the file is still open it may get a new one but that
|
|
* will get killed on last close in xfs_close() so we don't
|
|
* have to worry about that.
|
|
*/
|
|
if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
|
|
xfs_filestream_deassociate(ip);
|
|
|
|
return 0;
|
|
|
|
out_bmap_cancel:
|
|
xfs_bmap_cancel(&free_list);
|
|
cancel_flags |= XFS_TRANS_ABORT;
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp, cancel_flags);
|
|
std_return:
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_link(
|
|
xfs_inode_t *tdp,
|
|
xfs_inode_t *sip,
|
|
struct xfs_name *target_name)
|
|
{
|
|
xfs_mount_t *mp = tdp->i_mount;
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_fsblock_t first_block;
|
|
int cancel_flags;
|
|
int committed;
|
|
int resblks;
|
|
|
|
trace_xfs_link(tdp, target_name);
|
|
|
|
ASSERT(!S_ISDIR(sip->i_d.di_mode));
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return XFS_ERROR(EIO);
|
|
|
|
error = xfs_qm_dqattach(sip, 0);
|
|
if (error)
|
|
goto std_return;
|
|
|
|
error = xfs_qm_dqattach(tdp, 0);
|
|
if (error)
|
|
goto std_return;
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
|
|
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
|
|
resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
|
|
error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
|
|
if (error == ENOSPC) {
|
|
resblks = 0;
|
|
error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
|
|
}
|
|
if (error) {
|
|
cancel_flags = 0;
|
|
goto error_return;
|
|
}
|
|
|
|
xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
|
|
|
|
xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* If the source has too many links, we can't make any more to it.
|
|
*/
|
|
if (sip->i_d.di_nlink >= XFS_MAXLINK) {
|
|
error = XFS_ERROR(EMLINK);
|
|
goto error_return;
|
|
}
|
|
|
|
/*
|
|
* If we are using project inheritance, we only allow hard link
|
|
* creation in our tree when the project IDs are the same; else
|
|
* the tree quota mechanism could be circumvented.
|
|
*/
|
|
if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
|
|
(xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
|
|
error = XFS_ERROR(EXDEV);
|
|
goto error_return;
|
|
}
|
|
|
|
error = xfs_dir_canenter(tp, tdp, target_name, resblks);
|
|
if (error)
|
|
goto error_return;
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
|
|
error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
|
|
&first_block, &free_list, resblks);
|
|
if (error)
|
|
goto abort_return;
|
|
xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
|
|
|
|
error = xfs_bumplink(tp, sip);
|
|
if (error)
|
|
goto abort_return;
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* link transaction goes to disk before returning to
|
|
* the user.
|
|
*/
|
|
if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
|
|
xfs_trans_set_sync(tp);
|
|
}
|
|
|
|
error = xfs_bmap_finish (&tp, &free_list, &committed);
|
|
if (error) {
|
|
xfs_bmap_cancel(&free_list);
|
|
goto abort_return;
|
|
}
|
|
|
|
return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
|
|
abort_return:
|
|
cancel_flags |= XFS_TRANS_ABORT;
|
|
error_return:
|
|
xfs_trans_cancel(tp, cancel_flags);
|
|
std_return:
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_symlink(
|
|
xfs_inode_t *dp,
|
|
struct xfs_name *link_name,
|
|
const char *target_path,
|
|
mode_t mode,
|
|
xfs_inode_t **ipp)
|
|
{
|
|
xfs_mount_t *mp = dp->i_mount;
|
|
xfs_trans_t *tp;
|
|
xfs_inode_t *ip;
|
|
int error;
|
|
int pathlen;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_fsblock_t first_block;
|
|
boolean_t unlock_dp_on_error = B_FALSE;
|
|
uint cancel_flags;
|
|
int committed;
|
|
xfs_fileoff_t first_fsb;
|
|
xfs_filblks_t fs_blocks;
|
|
int nmaps;
|
|
xfs_bmbt_irec_t mval[SYMLINK_MAPS];
|
|
xfs_daddr_t d;
|
|
const char *cur_chunk;
|
|
int byte_cnt;
|
|
int n;
|
|
xfs_buf_t *bp;
|
|
prid_t prid;
|
|
struct xfs_dquot *udqp, *gdqp;
|
|
uint resblks;
|
|
|
|
*ipp = NULL;
|
|
error = 0;
|
|
ip = NULL;
|
|
tp = NULL;
|
|
|
|
trace_xfs_symlink(dp, link_name);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return XFS_ERROR(EIO);
|
|
|
|
/*
|
|
* Check component lengths of the target path name.
|
|
*/
|
|
pathlen = strlen(target_path);
|
|
if (pathlen >= MAXPATHLEN) /* total string too long */
|
|
return XFS_ERROR(ENAMETOOLONG);
|
|
|
|
udqp = gdqp = NULL;
|
|
if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
|
|
prid = xfs_get_projid(dp);
|
|
else
|
|
prid = XFS_PROJID_DEFAULT;
|
|
|
|
/*
|
|
* Make sure that we have allocated dquot(s) on disk.
|
|
*/
|
|
error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
|
|
XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
|
|
if (error)
|
|
goto std_return;
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
|
|
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
|
|
/*
|
|
* The symlink will fit into the inode data fork?
|
|
* There can't be any attributes so we get the whole variable part.
|
|
*/
|
|
if (pathlen <= XFS_LITINO(mp))
|
|
fs_blocks = 0;
|
|
else
|
|
fs_blocks = XFS_B_TO_FSB(mp, pathlen);
|
|
resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
|
|
error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
|
|
if (error == ENOSPC && fs_blocks == 0) {
|
|
resblks = 0;
|
|
error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
|
|
}
|
|
if (error) {
|
|
cancel_flags = 0;
|
|
goto error_return;
|
|
}
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
|
|
unlock_dp_on_error = B_TRUE;
|
|
|
|
/*
|
|
* Check whether the directory allows new symlinks or not.
|
|
*/
|
|
if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
|
|
error = XFS_ERROR(EPERM);
|
|
goto error_return;
|
|
}
|
|
|
|
/*
|
|
* Reserve disk quota : blocks and inode.
|
|
*/
|
|
error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
|
|
if (error)
|
|
goto error_return;
|
|
|
|
/*
|
|
* Check for ability to enter directory entry, if no space reserved.
|
|
*/
|
|
error = xfs_dir_canenter(tp, dp, link_name, resblks);
|
|
if (error)
|
|
goto error_return;
|
|
/*
|
|
* Initialize the bmap freelist prior to calling either
|
|
* bmapi or the directory create code.
|
|
*/
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
|
|
/*
|
|
* Allocate an inode for the symlink.
|
|
*/
|
|
error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
|
|
prid, resblks > 0, &ip, NULL);
|
|
if (error) {
|
|
if (error == ENOSPC)
|
|
goto error_return;
|
|
goto error1;
|
|
}
|
|
|
|
/*
|
|
* An error after we've joined dp to the transaction will result in the
|
|
* transaction cancel unlocking dp so don't do it explicitly in the
|
|
* error path.
|
|
*/
|
|
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
|
|
unlock_dp_on_error = B_FALSE;
|
|
|
|
/*
|
|
* Also attach the dquot(s) to it, if applicable.
|
|
*/
|
|
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
|
|
|
|
if (resblks)
|
|
resblks -= XFS_IALLOC_SPACE_RES(mp);
|
|
/*
|
|
* If the symlink will fit into the inode, write it inline.
|
|
*/
|
|
if (pathlen <= XFS_IFORK_DSIZE(ip)) {
|
|
xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
|
|
memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
|
|
ip->i_d.di_size = pathlen;
|
|
|
|
/*
|
|
* The inode was initially created in extent format.
|
|
*/
|
|
ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
|
|
ip->i_df.if_flags |= XFS_IFINLINE;
|
|
|
|
ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
|
|
|
|
} else {
|
|
first_fsb = 0;
|
|
nmaps = SYMLINK_MAPS;
|
|
|
|
error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
|
|
XFS_BMAPI_METADATA, &first_block, resblks,
|
|
mval, &nmaps, &free_list);
|
|
if (error)
|
|
goto error2;
|
|
|
|
if (resblks)
|
|
resblks -= fs_blocks;
|
|
ip->i_d.di_size = pathlen;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
cur_chunk = target_path;
|
|
for (n = 0; n < nmaps; n++) {
|
|
d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
|
|
byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
|
|
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
|
|
BTOBB(byte_cnt), 0);
|
|
if (!bp) {
|
|
error = ENOMEM;
|
|
goto error2;
|
|
}
|
|
if (pathlen < byte_cnt) {
|
|
byte_cnt = pathlen;
|
|
}
|
|
pathlen -= byte_cnt;
|
|
|
|
memcpy(bp->b_addr, cur_chunk, byte_cnt);
|
|
cur_chunk += byte_cnt;
|
|
|
|
xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create the directory entry for the symlink.
|
|
*/
|
|
error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
|
|
&first_block, &free_list, resblks);
|
|
if (error)
|
|
goto error2;
|
|
xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* symlink transaction goes to disk before returning to
|
|
* the user.
|
|
*/
|
|
if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
|
|
xfs_trans_set_sync(tp);
|
|
}
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error) {
|
|
goto error2;
|
|
}
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
|
|
*ipp = ip;
|
|
return 0;
|
|
|
|
error2:
|
|
IRELE(ip);
|
|
error1:
|
|
xfs_bmap_cancel(&free_list);
|
|
cancel_flags |= XFS_TRANS_ABORT;
|
|
error_return:
|
|
xfs_trans_cancel(tp, cancel_flags);
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
|
|
if (unlock_dp_on_error)
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
std_return:
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_set_dmattrs(
|
|
xfs_inode_t *ip,
|
|
u_int evmask,
|
|
u_int16_t state)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return XFS_ERROR(EPERM);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return XFS_ERROR(EIO);
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
|
|
error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return error;
|
|
}
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
|
|
ip->i_d.di_dmevmask = evmask;
|
|
ip->i_d.di_dmstate = state;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
error = xfs_trans_commit(tp, 0);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* xfs_alloc_file_space()
|
|
* This routine allocates disk space for the given file.
|
|
*
|
|
* If alloc_type == 0, this request is for an ALLOCSP type
|
|
* request which will change the file size. In this case, no
|
|
* DMAPI event will be generated by the call. A TRUNCATE event
|
|
* will be generated later by xfs_setattr.
|
|
*
|
|
* If alloc_type != 0, this request is for a RESVSP type
|
|
* request, and a DMAPI DM_EVENT_WRITE will be generated if the
|
|
* lower block boundary byte address is less than the file's
|
|
* length.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success
|
|
* errno on error
|
|
*
|
|
*/
|
|
STATIC int
|
|
xfs_alloc_file_space(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len,
|
|
int alloc_type,
|
|
int attr_flags)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_off_t count;
|
|
xfs_filblks_t allocated_fsb;
|
|
xfs_filblks_t allocatesize_fsb;
|
|
xfs_extlen_t extsz, temp;
|
|
xfs_fileoff_t startoffset_fsb;
|
|
xfs_fsblock_t firstfsb;
|
|
int nimaps;
|
|
int quota_flag;
|
|
int rt;
|
|
xfs_trans_t *tp;
|
|
xfs_bmbt_irec_t imaps[1], *imapp;
|
|
xfs_bmap_free_t free_list;
|
|
uint qblocks, resblks, resrtextents;
|
|
int committed;
|
|
int error;
|
|
|
|
trace_xfs_alloc_file_space(ip);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return XFS_ERROR(EIO);
|
|
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
if (len <= 0)
|
|
return XFS_ERROR(EINVAL);
|
|
|
|
rt = XFS_IS_REALTIME_INODE(ip);
|
|
extsz = xfs_get_extsz_hint(ip);
|
|
|
|
count = len;
|
|
imapp = &imaps[0];
|
|
nimaps = 1;
|
|
startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
allocatesize_fsb = XFS_B_TO_FSB(mp, count);
|
|
|
|
/*
|
|
* Allocate file space until done or until there is an error
|
|
*/
|
|
while (allocatesize_fsb && !error) {
|
|
xfs_fileoff_t s, e;
|
|
|
|
/*
|
|
* Determine space reservations for data/realtime.
|
|
*/
|
|
if (unlikely(extsz)) {
|
|
s = startoffset_fsb;
|
|
do_div(s, extsz);
|
|
s *= extsz;
|
|
e = startoffset_fsb + allocatesize_fsb;
|
|
if ((temp = do_mod(startoffset_fsb, extsz)))
|
|
e += temp;
|
|
if ((temp = do_mod(e, extsz)))
|
|
e += extsz - temp;
|
|
} else {
|
|
s = 0;
|
|
e = allocatesize_fsb;
|
|
}
|
|
|
|
/*
|
|
* The transaction reservation is limited to a 32-bit block
|
|
* count, hence we need to limit the number of blocks we are
|
|
* trying to reserve to avoid an overflow. We can't allocate
|
|
* more than @nimaps extents, and an extent is limited on disk
|
|
* to MAXEXTLEN (21 bits), so use that to enforce the limit.
|
|
*/
|
|
resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
|
|
if (unlikely(rt)) {
|
|
resrtextents = qblocks = resblks;
|
|
resrtextents /= mp->m_sb.sb_rextsize;
|
|
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
|
|
quota_flag = XFS_QMOPT_RES_RTBLKS;
|
|
} else {
|
|
resrtextents = 0;
|
|
resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
|
|
quota_flag = XFS_QMOPT_RES_REGBLKS;
|
|
}
|
|
|
|
/*
|
|
* Allocate and setup the transaction.
|
|
*/
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
|
|
error = xfs_trans_reserve(tp, resblks,
|
|
XFS_WRITE_LOG_RES(mp), resrtextents,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
/*
|
|
* Check for running out of space
|
|
*/
|
|
if (error) {
|
|
/*
|
|
* Free the transaction structure.
|
|
*/
|
|
ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
|
|
xfs_trans_cancel(tp, 0);
|
|
break;
|
|
}
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
|
|
0, quota_flag);
|
|
if (error)
|
|
goto error1;
|
|
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
xfs_bmap_init(&free_list, &firstfsb);
|
|
error = xfs_bmapi_write(tp, ip, startoffset_fsb,
|
|
allocatesize_fsb, alloc_type, &firstfsb,
|
|
0, imapp, &nimaps, &free_list);
|
|
if (error) {
|
|
goto error0;
|
|
}
|
|
|
|
/*
|
|
* Complete the transaction
|
|
*/
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error) {
|
|
goto error0;
|
|
}
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
if (error) {
|
|
break;
|
|
}
|
|
|
|
allocated_fsb = imapp->br_blockcount;
|
|
|
|
if (nimaps == 0) {
|
|
error = XFS_ERROR(ENOSPC);
|
|
break;
|
|
}
|
|
|
|
startoffset_fsb += allocated_fsb;
|
|
allocatesize_fsb -= allocated_fsb;
|
|
}
|
|
|
|
return error;
|
|
|
|
error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
|
|
|
|
error1: /* Just cancel transaction */
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Zero file bytes between startoff and endoff inclusive.
|
|
* The iolock is held exclusive and no blocks are buffered.
|
|
*
|
|
* This function is used by xfs_free_file_space() to zero
|
|
* partial blocks when the range to free is not block aligned.
|
|
* When unreserving space with boundaries that are not block
|
|
* aligned we round up the start and round down the end
|
|
* boundaries and then use this function to zero the parts of
|
|
* the blocks that got dropped during the rounding.
|
|
*/
|
|
STATIC int
|
|
xfs_zero_remaining_bytes(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t startoff,
|
|
xfs_off_t endoff)
|
|
{
|
|
xfs_bmbt_irec_t imap;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_off_t lastoffset;
|
|
xfs_off_t offset;
|
|
xfs_buf_t *bp;
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
int nimap;
|
|
int error = 0;
|
|
|
|
/*
|
|
* Avoid doing I/O beyond eof - it's not necessary
|
|
* since nothing can read beyond eof. The space will
|
|
* be zeroed when the file is extended anyway.
|
|
*/
|
|
if (startoff >= ip->i_size)
|
|
return 0;
|
|
|
|
if (endoff > ip->i_size)
|
|
endoff = ip->i_size;
|
|
|
|
bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
|
|
mp->m_rtdev_targp : mp->m_ddev_targp,
|
|
mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
|
|
if (!bp)
|
|
return XFS_ERROR(ENOMEM);
|
|
|
|
xfs_buf_unlock(bp);
|
|
|
|
for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
nimap = 1;
|
|
error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
|
|
if (error || nimap < 1)
|
|
break;
|
|
ASSERT(imap.br_blockcount >= 1);
|
|
ASSERT(imap.br_startoff == offset_fsb);
|
|
lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
|
|
if (lastoffset > endoff)
|
|
lastoffset = endoff;
|
|
if (imap.br_startblock == HOLESTARTBLOCK)
|
|
continue;
|
|
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
|
if (imap.br_state == XFS_EXT_UNWRITTEN)
|
|
continue;
|
|
XFS_BUF_UNDONE(bp);
|
|
XFS_BUF_UNWRITE(bp);
|
|
XFS_BUF_READ(bp);
|
|
XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
|
|
xfsbdstrat(mp, bp);
|
|
error = xfs_buf_iowait(bp);
|
|
if (error) {
|
|
xfs_buf_ioerror_alert(bp,
|
|
"xfs_zero_remaining_bytes(read)");
|
|
break;
|
|
}
|
|
memset(bp->b_addr +
|
|
(offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
|
|
0, lastoffset - offset + 1);
|
|
XFS_BUF_UNDONE(bp);
|
|
XFS_BUF_UNREAD(bp);
|
|
XFS_BUF_WRITE(bp);
|
|
xfsbdstrat(mp, bp);
|
|
error = xfs_buf_iowait(bp);
|
|
if (error) {
|
|
xfs_buf_ioerror_alert(bp,
|
|
"xfs_zero_remaining_bytes(write)");
|
|
break;
|
|
}
|
|
}
|
|
xfs_buf_free(bp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* xfs_free_file_space()
|
|
* This routine frees disk space for the given file.
|
|
*
|
|
* This routine is only called by xfs_change_file_space
|
|
* for an UNRESVSP type call.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success
|
|
* errno on error
|
|
*
|
|
*/
|
|
STATIC int
|
|
xfs_free_file_space(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len,
|
|
int attr_flags)
|
|
{
|
|
int committed;
|
|
int done;
|
|
xfs_fileoff_t endoffset_fsb;
|
|
int error;
|
|
xfs_fsblock_t firstfsb;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_bmbt_irec_t imap;
|
|
xfs_off_t ioffset;
|
|
xfs_extlen_t mod=0;
|
|
xfs_mount_t *mp;
|
|
int nimap;
|
|
uint resblks;
|
|
uint rounding;
|
|
int rt;
|
|
xfs_fileoff_t startoffset_fsb;
|
|
xfs_trans_t *tp;
|
|
int need_iolock = 1;
|
|
|
|
mp = ip->i_mount;
|
|
|
|
trace_xfs_free_file_space(ip);
|
|
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
error = 0;
|
|
if (len <= 0) /* if nothing being freed */
|
|
return error;
|
|
rt = XFS_IS_REALTIME_INODE(ip);
|
|
startoffset_fsb = XFS_B_TO_FSB(mp, offset);
|
|
endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
|
|
|
|
if (attr_flags & XFS_ATTR_NOLOCK)
|
|
need_iolock = 0;
|
|
if (need_iolock) {
|
|
xfs_ilock(ip, XFS_IOLOCK_EXCL);
|
|
/* wait for the completion of any pending DIOs */
|
|
inode_dio_wait(VFS_I(ip));
|
|
}
|
|
|
|
rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
|
|
ioffset = offset & ~(rounding - 1);
|
|
|
|
if (VN_CACHED(VFS_I(ip)) != 0) {
|
|
error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
|
|
if (error)
|
|
goto out_unlock_iolock;
|
|
}
|
|
|
|
/*
|
|
* Need to zero the stuff we're not freeing, on disk.
|
|
* If it's a realtime file & can't use unwritten extents then we
|
|
* actually need to zero the extent edges. Otherwise xfs_bunmapi
|
|
* will take care of it for us.
|
|
*/
|
|
if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
|
|
nimap = 1;
|
|
error = xfs_bmapi_read(ip, startoffset_fsb, 1,
|
|
&imap, &nimap, 0);
|
|
if (error)
|
|
goto out_unlock_iolock;
|
|
ASSERT(nimap == 0 || nimap == 1);
|
|
if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
|
|
xfs_daddr_t block;
|
|
|
|
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
|
block = imap.br_startblock;
|
|
mod = do_div(block, mp->m_sb.sb_rextsize);
|
|
if (mod)
|
|
startoffset_fsb += mp->m_sb.sb_rextsize - mod;
|
|
}
|
|
nimap = 1;
|
|
error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
|
|
&imap, &nimap, 0);
|
|
if (error)
|
|
goto out_unlock_iolock;
|
|
ASSERT(nimap == 0 || nimap == 1);
|
|
if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
|
|
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
|
mod++;
|
|
if (mod && (mod != mp->m_sb.sb_rextsize))
|
|
endoffset_fsb -= mod;
|
|
}
|
|
}
|
|
if ((done = (endoffset_fsb <= startoffset_fsb)))
|
|
/*
|
|
* One contiguous piece to clear
|
|
*/
|
|
error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
|
|
else {
|
|
/*
|
|
* Some full blocks, possibly two pieces to clear
|
|
*/
|
|
if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
|
|
error = xfs_zero_remaining_bytes(ip, offset,
|
|
XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
|
|
if (!error &&
|
|
XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
|
|
error = xfs_zero_remaining_bytes(ip,
|
|
XFS_FSB_TO_B(mp, endoffset_fsb),
|
|
offset + len - 1);
|
|
}
|
|
|
|
/*
|
|
* free file space until done or until there is an error
|
|
*/
|
|
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
|
|
while (!error && !done) {
|
|
|
|
/*
|
|
* allocate and setup the transaction. Allow this
|
|
* transaction to dip into the reserve blocks to ensure
|
|
* the freeing of the space succeeds at ENOSPC.
|
|
*/
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
|
|
tp->t_flags |= XFS_TRANS_RESERVE;
|
|
error = xfs_trans_reserve(tp,
|
|
resblks,
|
|
XFS_WRITE_LOG_RES(mp),
|
|
0,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
|
|
/*
|
|
* check for running out of space
|
|
*/
|
|
if (error) {
|
|
/*
|
|
* Free the transaction structure.
|
|
*/
|
|
ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
|
|
xfs_trans_cancel(tp, 0);
|
|
break;
|
|
}
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
error = xfs_trans_reserve_quota(tp, mp,
|
|
ip->i_udquot, ip->i_gdquot,
|
|
resblks, 0, XFS_QMOPT_RES_REGBLKS);
|
|
if (error)
|
|
goto error1;
|
|
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
/*
|
|
* issue the bunmapi() call to free the blocks
|
|
*/
|
|
xfs_bmap_init(&free_list, &firstfsb);
|
|
error = xfs_bunmapi(tp, ip, startoffset_fsb,
|
|
endoffset_fsb - startoffset_fsb,
|
|
0, 2, &firstfsb, &free_list, &done);
|
|
if (error) {
|
|
goto error0;
|
|
}
|
|
|
|
/*
|
|
* complete the transaction
|
|
*/
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error) {
|
|
goto error0;
|
|
}
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
out_unlock_iolock:
|
|
if (need_iolock)
|
|
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
|
return error;
|
|
|
|
error0:
|
|
xfs_bmap_cancel(&free_list);
|
|
error1:
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
|
|
XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* xfs_change_file_space()
|
|
* This routine allocates or frees disk space for the given file.
|
|
* The user specified parameters are checked for alignment and size
|
|
* limitations.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success
|
|
* errno on error
|
|
*
|
|
*/
|
|
int
|
|
xfs_change_file_space(
|
|
xfs_inode_t *ip,
|
|
int cmd,
|
|
xfs_flock64_t *bf,
|
|
xfs_off_t offset,
|
|
int attr_flags)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
int clrprealloc;
|
|
int error;
|
|
xfs_fsize_t fsize;
|
|
int setprealloc;
|
|
xfs_off_t startoffset;
|
|
xfs_off_t llen;
|
|
xfs_trans_t *tp;
|
|
struct iattr iattr;
|
|
int prealloc_type;
|
|
|
|
if (!S_ISREG(ip->i_d.di_mode))
|
|
return XFS_ERROR(EINVAL);
|
|
|
|
switch (bf->l_whence) {
|
|
case 0: /*SEEK_SET*/
|
|
break;
|
|
case 1: /*SEEK_CUR*/
|
|
bf->l_start += offset;
|
|
break;
|
|
case 2: /*SEEK_END*/
|
|
bf->l_start += ip->i_size;
|
|
break;
|
|
default:
|
|
return XFS_ERROR(EINVAL);
|
|
}
|
|
|
|
llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
|
|
|
|
if ( (bf->l_start < 0)
|
|
|| (bf->l_start > XFS_MAXIOFFSET(mp))
|
|
|| (bf->l_start + llen < 0)
|
|
|| (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
|
|
return XFS_ERROR(EINVAL);
|
|
|
|
bf->l_whence = 0;
|
|
|
|
startoffset = bf->l_start;
|
|
fsize = ip->i_size;
|
|
|
|
/*
|
|
* XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
|
|
* file space.
|
|
* These calls do NOT zero the data space allocated to the file,
|
|
* nor do they change the file size.
|
|
*
|
|
* XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
|
|
* space.
|
|
* These calls cause the new file data to be zeroed and the file
|
|
* size to be changed.
|
|
*/
|
|
setprealloc = clrprealloc = 0;
|
|
prealloc_type = XFS_BMAPI_PREALLOC;
|
|
|
|
switch (cmd) {
|
|
case XFS_IOC_ZERO_RANGE:
|
|
prealloc_type |= XFS_BMAPI_CONVERT;
|
|
xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
|
|
/* FALLTHRU */
|
|
case XFS_IOC_RESVSP:
|
|
case XFS_IOC_RESVSP64:
|
|
error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
|
|
prealloc_type, attr_flags);
|
|
if (error)
|
|
return error;
|
|
setprealloc = 1;
|
|
break;
|
|
|
|
case XFS_IOC_UNRESVSP:
|
|
case XFS_IOC_UNRESVSP64:
|
|
if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
|
|
attr_flags)))
|
|
return error;
|
|
break;
|
|
|
|
case XFS_IOC_ALLOCSP:
|
|
case XFS_IOC_ALLOCSP64:
|
|
case XFS_IOC_FREESP:
|
|
case XFS_IOC_FREESP64:
|
|
if (startoffset > fsize) {
|
|
error = xfs_alloc_file_space(ip, fsize,
|
|
startoffset - fsize, 0, attr_flags);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
iattr.ia_valid = ATTR_SIZE;
|
|
iattr.ia_size = startoffset;
|
|
|
|
error = xfs_setattr_size(ip, &iattr, attr_flags);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
clrprealloc = 1;
|
|
break;
|
|
|
|
default:
|
|
ASSERT(0);
|
|
return XFS_ERROR(EINVAL);
|
|
}
|
|
|
|
/*
|
|
* update the inode timestamp, mode, and prealloc flag bits
|
|
*/
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
|
|
|
|
if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
|
|
0, 0, 0))) {
|
|
/* ASSERT(0); */
|
|
xfs_trans_cancel(tp, 0);
|
|
return error;
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
|
|
if ((attr_flags & XFS_ATTR_DMI) == 0) {
|
|
ip->i_d.di_mode &= ~S_ISUID;
|
|
|
|
/*
|
|
* Note that we don't have to worry about mandatory
|
|
* file locking being disabled here because we only
|
|
* clear the S_ISGID bit if the Group execute bit is
|
|
* on, but if it was on then mandatory locking wouldn't
|
|
* have been enabled.
|
|
*/
|
|
if (ip->i_d.di_mode & S_IXGRP)
|
|
ip->i_d.di_mode &= ~S_ISGID;
|
|
|
|
xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
}
|
|
if (setprealloc)
|
|
ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
|
|
else if (clrprealloc)
|
|
ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
if (attr_flags & XFS_ATTR_SYNC)
|
|
xfs_trans_set_sync(tp);
|
|
return xfs_trans_commit(tp, 0);
|
|
}
|