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7c2d238ac6
Refactor xfs_lock_two_inodes to take separate locking modes for each inode. Specifically, this enables us to take a SHARED lock on one inode and an EXCL lock on the other. The lock class (MMAPLOCK/ILOCK) must be the same for each inode. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2058 lines
53 KiB
C
2058 lines
53 KiB
C
/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* Copyright (c) 2012 Red Hat, 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_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_defer.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_trans.h"
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#include "xfs_extfree_item.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_rtalloc.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_trans_space.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_log.h"
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#include "xfs_rmap_btree.h"
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#include "xfs_iomap.h"
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#include "xfs_reflink.h"
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#include "xfs_refcount.h"
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/* Kernel only BMAP related definitions and functions */
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/*
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* Convert the given file system block to a disk block. We have to treat it
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* differently based on whether the file is a real time file or not, because the
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* bmap code does.
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*/
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xfs_daddr_t
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xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
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{
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return (XFS_IS_REALTIME_INODE(ip) ? \
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(xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
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XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
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}
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/*
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* Routine to zero an extent on disk allocated to the specific inode.
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*
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* The VFS functions take a linearised filesystem block offset, so we have to
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* convert the sparse xfs fsb to the right format first.
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* VFS types are real funky, too.
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*/
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int
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xfs_zero_extent(
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struct xfs_inode *ip,
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xfs_fsblock_t start_fsb,
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xfs_off_t count_fsb)
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{
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struct xfs_mount *mp = ip->i_mount;
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xfs_daddr_t sector = xfs_fsb_to_db(ip, start_fsb);
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sector_t block = XFS_BB_TO_FSBT(mp, sector);
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return blkdev_issue_zeroout(xfs_find_bdev_for_inode(VFS_I(ip)),
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block << (mp->m_super->s_blocksize_bits - 9),
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count_fsb << (mp->m_super->s_blocksize_bits - 9),
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GFP_NOFS, 0);
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}
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#ifdef CONFIG_XFS_RT
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int
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xfs_bmap_rtalloc(
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struct xfs_bmalloca *ap) /* bmap alloc argument struct */
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{
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int error; /* error return value */
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xfs_mount_t *mp; /* mount point structure */
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xfs_extlen_t prod = 0; /* product factor for allocators */
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xfs_extlen_t ralen = 0; /* realtime allocation length */
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xfs_extlen_t align; /* minimum allocation alignment */
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xfs_rtblock_t rtb;
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mp = ap->ip->i_mount;
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align = xfs_get_extsz_hint(ap->ip);
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prod = align / mp->m_sb.sb_rextsize;
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error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
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align, 1, ap->eof, 0,
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ap->conv, &ap->offset, &ap->length);
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if (error)
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return error;
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ASSERT(ap->length);
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ASSERT(ap->length % mp->m_sb.sb_rextsize == 0);
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/*
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* If the offset & length are not perfectly aligned
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* then kill prod, it will just get us in trouble.
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*/
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if (do_mod(ap->offset, align) || ap->length % align)
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prod = 1;
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/*
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* Set ralen to be the actual requested length in rtextents.
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*/
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ralen = ap->length / mp->m_sb.sb_rextsize;
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/*
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* If the old value was close enough to MAXEXTLEN that
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* we rounded up to it, cut it back so it's valid again.
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* Note that if it's a really large request (bigger than
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* MAXEXTLEN), we don't hear about that number, and can't
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* adjust the starting point to match it.
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*/
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if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
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ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
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/*
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* Lock out modifications to both the RT bitmap and summary inodes
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*/
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xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
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xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
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xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
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xfs_trans_ijoin(ap->tp, mp->m_rsumip, XFS_ILOCK_EXCL);
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/*
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* If it's an allocation to an empty file at offset 0,
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* pick an extent that will space things out in the rt area.
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*/
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if (ap->eof && ap->offset == 0) {
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xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
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error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
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if (error)
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return error;
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ap->blkno = rtx * mp->m_sb.sb_rextsize;
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} else {
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ap->blkno = 0;
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}
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xfs_bmap_adjacent(ap);
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/*
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* Realtime allocation, done through xfs_rtallocate_extent.
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*/
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do_div(ap->blkno, mp->m_sb.sb_rextsize);
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rtb = ap->blkno;
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ap->length = ralen;
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error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length,
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&ralen, ap->wasdel, prod, &rtb);
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if (error)
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return error;
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ap->blkno = rtb;
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if (ap->blkno != NULLFSBLOCK) {
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ap->blkno *= mp->m_sb.sb_rextsize;
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ralen *= mp->m_sb.sb_rextsize;
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ap->length = ralen;
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ap->ip->i_d.di_nblocks += ralen;
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xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
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if (ap->wasdel)
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ap->ip->i_delayed_blks -= ralen;
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/*
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* Adjust the disk quota also. This was reserved
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* earlier.
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*/
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xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
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ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
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XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
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/* Zero the extent if we were asked to do so */
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if (ap->datatype & XFS_ALLOC_USERDATA_ZERO) {
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error = xfs_zero_extent(ap->ip, ap->blkno, ap->length);
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if (error)
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return error;
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}
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} else {
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ap->length = 0;
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}
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return 0;
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}
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#endif /* CONFIG_XFS_RT */
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/*
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* Check if the endoff is outside the last extent. If so the caller will grow
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* the allocation to a stripe unit boundary. All offsets are considered outside
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* the end of file for an empty fork, so 1 is returned in *eof in that case.
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*/
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int
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xfs_bmap_eof(
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struct xfs_inode *ip,
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xfs_fileoff_t endoff,
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int whichfork,
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int *eof)
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{
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struct xfs_bmbt_irec rec;
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int error;
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error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof);
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if (error || *eof)
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return error;
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*eof = endoff >= rec.br_startoff + rec.br_blockcount;
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return 0;
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}
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/*
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* Extent tree block counting routines.
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*/
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/*
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* Count leaf blocks given a range of extent records. Delayed allocation
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* extents are not counted towards the totals.
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*/
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xfs_extnum_t
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xfs_bmap_count_leaves(
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struct xfs_ifork *ifp,
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xfs_filblks_t *count)
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{
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struct xfs_iext_cursor icur;
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struct xfs_bmbt_irec got;
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xfs_extnum_t numrecs = 0;
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for_each_xfs_iext(ifp, &icur, &got) {
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if (!isnullstartblock(got.br_startblock)) {
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*count += got.br_blockcount;
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numrecs++;
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}
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}
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return numrecs;
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}
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/*
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* Count leaf blocks given a range of extent records originally
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* in btree format.
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*/
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STATIC void
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xfs_bmap_disk_count_leaves(
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struct xfs_mount *mp,
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struct xfs_btree_block *block,
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int numrecs,
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xfs_filblks_t *count)
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{
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int b;
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xfs_bmbt_rec_t *frp;
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for (b = 1; b <= numrecs; b++) {
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frp = XFS_BMBT_REC_ADDR(mp, block, b);
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*count += xfs_bmbt_disk_get_blockcount(frp);
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}
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}
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/*
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* Recursively walks each level of a btree
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* to count total fsblocks in use.
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*/
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STATIC int
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xfs_bmap_count_tree(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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struct xfs_ifork *ifp,
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xfs_fsblock_t blockno,
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int levelin,
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xfs_extnum_t *nextents,
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xfs_filblks_t *count)
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{
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int error;
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struct xfs_buf *bp, *nbp;
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int level = levelin;
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__be64 *pp;
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xfs_fsblock_t bno = blockno;
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xfs_fsblock_t nextbno;
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struct xfs_btree_block *block, *nextblock;
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int numrecs;
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error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF,
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&xfs_bmbt_buf_ops);
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if (error)
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return error;
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*count += 1;
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block = XFS_BUF_TO_BLOCK(bp);
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if (--level) {
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/* Not at node above leaves, count this level of nodes */
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nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
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while (nextbno != NULLFSBLOCK) {
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error = xfs_btree_read_bufl(mp, tp, nextbno, 0, &nbp,
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XFS_BMAP_BTREE_REF,
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&xfs_bmbt_buf_ops);
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if (error)
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return error;
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*count += 1;
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nextblock = XFS_BUF_TO_BLOCK(nbp);
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nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
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xfs_trans_brelse(tp, nbp);
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}
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/* Dive to the next level */
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pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
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bno = be64_to_cpu(*pp);
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error = xfs_bmap_count_tree(mp, tp, ifp, bno, level, nextents,
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count);
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if (error) {
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xfs_trans_brelse(tp, bp);
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XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
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XFS_ERRLEVEL_LOW, mp);
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return -EFSCORRUPTED;
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}
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xfs_trans_brelse(tp, bp);
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} else {
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/* count all level 1 nodes and their leaves */
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for (;;) {
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nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
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numrecs = be16_to_cpu(block->bb_numrecs);
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(*nextents) += numrecs;
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xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
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xfs_trans_brelse(tp, bp);
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if (nextbno == NULLFSBLOCK)
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break;
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bno = nextbno;
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error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
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XFS_BMAP_BTREE_REF,
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&xfs_bmbt_buf_ops);
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if (error)
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return error;
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*count += 1;
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block = XFS_BUF_TO_BLOCK(bp);
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}
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}
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return 0;
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}
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/*
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* Count fsblocks of the given fork. Delayed allocation extents are
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* not counted towards the totals.
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*/
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int
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xfs_bmap_count_blocks(
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struct xfs_trans *tp,
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struct xfs_inode *ip,
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int whichfork,
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xfs_extnum_t *nextents,
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xfs_filblks_t *count)
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{
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struct xfs_mount *mp; /* file system mount structure */
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__be64 *pp; /* pointer to block address */
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struct xfs_btree_block *block; /* current btree block */
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struct xfs_ifork *ifp; /* fork structure */
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xfs_fsblock_t bno; /* block # of "block" */
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int level; /* btree level, for checking */
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int error;
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bno = NULLFSBLOCK;
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mp = ip->i_mount;
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*nextents = 0;
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*count = 0;
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ifp = XFS_IFORK_PTR(ip, whichfork);
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if (!ifp)
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return 0;
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switch (XFS_IFORK_FORMAT(ip, whichfork)) {
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case XFS_DINODE_FMT_EXTENTS:
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*nextents = xfs_bmap_count_leaves(ifp, count);
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return 0;
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case XFS_DINODE_FMT_BTREE:
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if (!(ifp->if_flags & XFS_IFEXTENTS)) {
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error = xfs_iread_extents(tp, ip, whichfork);
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if (error)
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return error;
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}
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/*
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* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
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*/
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block = ifp->if_broot;
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level = be16_to_cpu(block->bb_level);
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ASSERT(level > 0);
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pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
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bno = be64_to_cpu(*pp);
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ASSERT(bno != NULLFSBLOCK);
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ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
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ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
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error = xfs_bmap_count_tree(mp, tp, ifp, bno, level,
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nextents, count);
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if (error) {
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XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)",
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XFS_ERRLEVEL_LOW, mp);
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return -EFSCORRUPTED;
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}
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return 0;
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}
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return 0;
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}
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static int
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xfs_getbmap_report_one(
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struct xfs_inode *ip,
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struct getbmapx *bmv,
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struct kgetbmap *out,
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int64_t bmv_end,
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struct xfs_bmbt_irec *got)
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{
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struct kgetbmap *p = out + bmv->bmv_entries;
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bool shared = false, trimmed = false;
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int error;
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error = xfs_reflink_trim_around_shared(ip, got, &shared, &trimmed);
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if (error)
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return error;
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if (isnullstartblock(got->br_startblock) ||
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got->br_startblock == DELAYSTARTBLOCK) {
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/*
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* Delalloc extents that start beyond EOF can occur due to
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* speculative EOF allocation when the delalloc extent is larger
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* than the largest freespace extent at conversion time. These
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* extents cannot be converted by data writeback, so can exist
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* here even if we are not supposed to be finding delalloc
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* extents.
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*/
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if (got->br_startoff < XFS_B_TO_FSB(ip->i_mount, XFS_ISIZE(ip)))
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ASSERT((bmv->bmv_iflags & BMV_IF_DELALLOC) != 0);
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p->bmv_oflags |= BMV_OF_DELALLOC;
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p->bmv_block = -2;
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} else {
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p->bmv_block = xfs_fsb_to_db(ip, got->br_startblock);
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}
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if (got->br_state == XFS_EXT_UNWRITTEN &&
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(bmv->bmv_iflags & BMV_IF_PREALLOC))
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p->bmv_oflags |= BMV_OF_PREALLOC;
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if (shared)
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p->bmv_oflags |= BMV_OF_SHARED;
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p->bmv_offset = XFS_FSB_TO_BB(ip->i_mount, got->br_startoff);
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p->bmv_length = XFS_FSB_TO_BB(ip->i_mount, got->br_blockcount);
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bmv->bmv_offset = p->bmv_offset + p->bmv_length;
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bmv->bmv_length = max(0LL, bmv_end - bmv->bmv_offset);
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bmv->bmv_entries++;
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return 0;
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}
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static void
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xfs_getbmap_report_hole(
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struct xfs_inode *ip,
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struct getbmapx *bmv,
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struct kgetbmap *out,
|
|
int64_t bmv_end,
|
|
xfs_fileoff_t bno,
|
|
xfs_fileoff_t end)
|
|
{
|
|
struct kgetbmap *p = out + bmv->bmv_entries;
|
|
|
|
if (bmv->bmv_iflags & BMV_IF_NO_HOLES)
|
|
return;
|
|
|
|
p->bmv_block = -1;
|
|
p->bmv_offset = XFS_FSB_TO_BB(ip->i_mount, bno);
|
|
p->bmv_length = XFS_FSB_TO_BB(ip->i_mount, end - bno);
|
|
|
|
bmv->bmv_offset = p->bmv_offset + p->bmv_length;
|
|
bmv->bmv_length = max(0LL, bmv_end - bmv->bmv_offset);
|
|
bmv->bmv_entries++;
|
|
}
|
|
|
|
static inline bool
|
|
xfs_getbmap_full(
|
|
struct getbmapx *bmv)
|
|
{
|
|
return bmv->bmv_length == 0 || bmv->bmv_entries >= bmv->bmv_count - 1;
|
|
}
|
|
|
|
static bool
|
|
xfs_getbmap_next_rec(
|
|
struct xfs_bmbt_irec *rec,
|
|
xfs_fileoff_t total_end)
|
|
{
|
|
xfs_fileoff_t end = rec->br_startoff + rec->br_blockcount;
|
|
|
|
if (end == total_end)
|
|
return false;
|
|
|
|
rec->br_startoff += rec->br_blockcount;
|
|
if (!isnullstartblock(rec->br_startblock) &&
|
|
rec->br_startblock != DELAYSTARTBLOCK)
|
|
rec->br_startblock += rec->br_blockcount;
|
|
rec->br_blockcount = total_end - end;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Get inode's extents as described in bmv, and format for output.
|
|
* Calls formatter to fill the user's buffer until all extents
|
|
* are mapped, until the passed-in bmv->bmv_count slots have
|
|
* been filled, or until the formatter short-circuits the loop,
|
|
* if it is tracking filled-in extents on its own.
|
|
*/
|
|
int /* error code */
|
|
xfs_getbmap(
|
|
struct xfs_inode *ip,
|
|
struct getbmapx *bmv, /* user bmap structure */
|
|
struct kgetbmap *out)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int iflags = bmv->bmv_iflags;
|
|
int whichfork, lock, error = 0;
|
|
int64_t bmv_end, max_len;
|
|
xfs_fileoff_t bno, first_bno;
|
|
struct xfs_ifork *ifp;
|
|
struct xfs_bmbt_irec got, rec;
|
|
xfs_filblks_t len;
|
|
struct xfs_iext_cursor icur;
|
|
|
|
if (bmv->bmv_iflags & ~BMV_IF_VALID)
|
|
return -EINVAL;
|
|
#ifndef DEBUG
|
|
/* Only allow CoW fork queries if we're debugging. */
|
|
if (iflags & BMV_IF_COWFORK)
|
|
return -EINVAL;
|
|
#endif
|
|
if ((iflags & BMV_IF_ATTRFORK) && (iflags & BMV_IF_COWFORK))
|
|
return -EINVAL;
|
|
|
|
if (bmv->bmv_length < -1)
|
|
return -EINVAL;
|
|
bmv->bmv_entries = 0;
|
|
if (bmv->bmv_length == 0)
|
|
return 0;
|
|
|
|
if (iflags & BMV_IF_ATTRFORK)
|
|
whichfork = XFS_ATTR_FORK;
|
|
else if (iflags & BMV_IF_COWFORK)
|
|
whichfork = XFS_COW_FORK;
|
|
else
|
|
whichfork = XFS_DATA_FORK;
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
|
|
xfs_ilock(ip, XFS_IOLOCK_SHARED);
|
|
switch (whichfork) {
|
|
case XFS_ATTR_FORK:
|
|
if (!XFS_IFORK_Q(ip))
|
|
goto out_unlock_iolock;
|
|
|
|
max_len = 1LL << 32;
|
|
lock = xfs_ilock_attr_map_shared(ip);
|
|
break;
|
|
case XFS_COW_FORK:
|
|
/* No CoW fork? Just return */
|
|
if (!ifp)
|
|
goto out_unlock_iolock;
|
|
|
|
if (xfs_get_cowextsz_hint(ip))
|
|
max_len = mp->m_super->s_maxbytes;
|
|
else
|
|
max_len = XFS_ISIZE(ip);
|
|
|
|
lock = XFS_ILOCK_SHARED;
|
|
xfs_ilock(ip, lock);
|
|
break;
|
|
case XFS_DATA_FORK:
|
|
if (!(iflags & BMV_IF_DELALLOC) &&
|
|
(ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size)) {
|
|
error = filemap_write_and_wait(VFS_I(ip)->i_mapping);
|
|
if (error)
|
|
goto out_unlock_iolock;
|
|
|
|
/*
|
|
* Even after flushing the inode, there can still be
|
|
* delalloc blocks on the inode beyond EOF due to
|
|
* speculative preallocation. These are not removed
|
|
* until the release function is called or the inode
|
|
* is inactivated. Hence we cannot assert here that
|
|
* ip->i_delayed_blks == 0.
|
|
*/
|
|
}
|
|
|
|
if (xfs_get_extsz_hint(ip) ||
|
|
(ip->i_d.di_flags &
|
|
(XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))
|
|
max_len = mp->m_super->s_maxbytes;
|
|
else
|
|
max_len = XFS_ISIZE(ip);
|
|
|
|
lock = xfs_ilock_data_map_shared(ip);
|
|
break;
|
|
}
|
|
|
|
switch (XFS_IFORK_FORMAT(ip, whichfork)) {
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
case XFS_DINODE_FMT_BTREE:
|
|
break;
|
|
case XFS_DINODE_FMT_LOCAL:
|
|
/* Local format inode forks report no extents. */
|
|
goto out_unlock_ilock;
|
|
default:
|
|
error = -EINVAL;
|
|
goto out_unlock_ilock;
|
|
}
|
|
|
|
if (bmv->bmv_length == -1) {
|
|
max_len = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, max_len));
|
|
bmv->bmv_length = max(0LL, max_len - bmv->bmv_offset);
|
|
}
|
|
|
|
bmv_end = bmv->bmv_offset + bmv->bmv_length;
|
|
|
|
first_bno = bno = XFS_BB_TO_FSBT(mp, bmv->bmv_offset);
|
|
len = XFS_BB_TO_FSB(mp, bmv->bmv_length);
|
|
|
|
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
|
|
error = xfs_iread_extents(NULL, ip, whichfork);
|
|
if (error)
|
|
goto out_unlock_ilock;
|
|
}
|
|
|
|
if (!xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got)) {
|
|
/*
|
|
* Report a whole-file hole if the delalloc flag is set to
|
|
* stay compatible with the old implementation.
|
|
*/
|
|
if (iflags & BMV_IF_DELALLOC)
|
|
xfs_getbmap_report_hole(ip, bmv, out, bmv_end, bno,
|
|
XFS_B_TO_FSB(mp, XFS_ISIZE(ip)));
|
|
goto out_unlock_ilock;
|
|
}
|
|
|
|
while (!xfs_getbmap_full(bmv)) {
|
|
xfs_trim_extent(&got, first_bno, len);
|
|
|
|
/*
|
|
* Report an entry for a hole if this extent doesn't directly
|
|
* follow the previous one.
|
|
*/
|
|
if (got.br_startoff > bno) {
|
|
xfs_getbmap_report_hole(ip, bmv, out, bmv_end, bno,
|
|
got.br_startoff);
|
|
if (xfs_getbmap_full(bmv))
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* In order to report shared extents accurately, we report each
|
|
* distinct shared / unshared part of a single bmbt record with
|
|
* an individual getbmapx record.
|
|
*/
|
|
bno = got.br_startoff + got.br_blockcount;
|
|
rec = got;
|
|
do {
|
|
error = xfs_getbmap_report_one(ip, bmv, out, bmv_end,
|
|
&rec);
|
|
if (error || xfs_getbmap_full(bmv))
|
|
goto out_unlock_ilock;
|
|
} while (xfs_getbmap_next_rec(&rec, bno));
|
|
|
|
if (!xfs_iext_next_extent(ifp, &icur, &got)) {
|
|
xfs_fileoff_t end = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
|
|
|
|
out[bmv->bmv_entries - 1].bmv_oflags |= BMV_OF_LAST;
|
|
|
|
if (whichfork != XFS_ATTR_FORK && bno < end &&
|
|
!xfs_getbmap_full(bmv)) {
|
|
xfs_getbmap_report_hole(ip, bmv, out, bmv_end,
|
|
bno, end);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (bno >= first_bno + len)
|
|
break;
|
|
}
|
|
|
|
out_unlock_ilock:
|
|
xfs_iunlock(ip, lock);
|
|
out_unlock_iolock:
|
|
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* dead simple method of punching delalyed allocation blocks from a range in
|
|
* the inode. Walks a block at a time so will be slow, but is only executed in
|
|
* rare error cases so the overhead is not critical. This will always punch out
|
|
* both the start and end blocks, even if the ranges only partially overlap
|
|
* them, so it is up to the caller to ensure that partial blocks are not
|
|
* passed in.
|
|
*/
|
|
int
|
|
xfs_bmap_punch_delalloc_range(
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t start_fsb,
|
|
xfs_fileoff_t length)
|
|
{
|
|
xfs_fileoff_t remaining = length;
|
|
int error = 0;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
do {
|
|
int done;
|
|
xfs_bmbt_irec_t imap;
|
|
int nimaps = 1;
|
|
xfs_fsblock_t firstblock;
|
|
struct xfs_defer_ops dfops;
|
|
|
|
/*
|
|
* Map the range first and check that it is a delalloc extent
|
|
* before trying to unmap the range. Otherwise we will be
|
|
* trying to remove a real extent (which requires a
|
|
* transaction) or a hole, which is probably a bad idea...
|
|
*/
|
|
error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps,
|
|
XFS_BMAPI_ENTIRE);
|
|
|
|
if (error) {
|
|
/* something screwed, just bail */
|
|
if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
|
|
xfs_alert(ip->i_mount,
|
|
"Failed delalloc mapping lookup ino %lld fsb %lld.",
|
|
ip->i_ino, start_fsb);
|
|
}
|
|
break;
|
|
}
|
|
if (!nimaps) {
|
|
/* nothing there */
|
|
goto next_block;
|
|
}
|
|
if (imap.br_startblock != DELAYSTARTBLOCK) {
|
|
/* been converted, ignore */
|
|
goto next_block;
|
|
}
|
|
WARN_ON(imap.br_blockcount == 0);
|
|
|
|
/*
|
|
* Note: while we initialise the firstblock/dfops pair, they
|
|
* should never be used because blocks should never be
|
|
* allocated or freed for a delalloc extent and hence we need
|
|
* don't cancel or finish them after the xfs_bunmapi() call.
|
|
*/
|
|
xfs_defer_init(&dfops, &firstblock);
|
|
error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
|
|
&dfops, &done);
|
|
if (error)
|
|
break;
|
|
|
|
ASSERT(!xfs_defer_has_unfinished_work(&dfops));
|
|
next_block:
|
|
start_fsb++;
|
|
remaining--;
|
|
} while(remaining > 0);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Test whether it is appropriate to check an inode for and free post EOF
|
|
* blocks. The 'force' parameter determines whether we should also consider
|
|
* regular files that are marked preallocated or append-only.
|
|
*/
|
|
bool
|
|
xfs_can_free_eofblocks(struct xfs_inode *ip, bool force)
|
|
{
|
|
/* prealloc/delalloc exists only on regular files */
|
|
if (!S_ISREG(VFS_I(ip)->i_mode))
|
|
return false;
|
|
|
|
/*
|
|
* Zero sized files with no cached pages and delalloc blocks will not
|
|
* have speculative prealloc/delalloc blocks to remove.
|
|
*/
|
|
if (VFS_I(ip)->i_size == 0 &&
|
|
VFS_I(ip)->i_mapping->nrpages == 0 &&
|
|
ip->i_delayed_blks == 0)
|
|
return false;
|
|
|
|
/* If we haven't read in the extent list, then don't do it now. */
|
|
if (!(ip->i_df.if_flags & XFS_IFEXTENTS))
|
|
return false;
|
|
|
|
/*
|
|
* Do not free real preallocated or append-only files unless the file
|
|
* has delalloc blocks and we are forced to remove them.
|
|
*/
|
|
if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND))
|
|
if (!force || ip->i_delayed_blks == 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* This is called to free any blocks beyond eof. The caller must hold
|
|
* IOLOCK_EXCL unless we are in the inode reclaim path and have the only
|
|
* reference to the inode.
|
|
*/
|
|
int
|
|
xfs_free_eofblocks(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
xfs_fileoff_t end_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
xfs_filblks_t map_len;
|
|
int nimaps;
|
|
struct xfs_bmbt_irec imap;
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
/*
|
|
* Figure out if there are any blocks beyond the end
|
|
* of the file. If not, then there is nothing to do.
|
|
*/
|
|
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
|
|
last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
|
|
if (last_fsb <= end_fsb)
|
|
return 0;
|
|
map_len = last_fsb - end_fsb;
|
|
|
|
nimaps = 1;
|
|
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
|
|
/*
|
|
* If there are blocks after the end of file, truncate the file to its
|
|
* current size to free them up.
|
|
*/
|
|
if (!error && (nimaps != 0) &&
|
|
(imap.br_startblock != HOLESTARTBLOCK ||
|
|
ip->i_delayed_blks)) {
|
|
/*
|
|
* Attach the dquots to the inode up front.
|
|
*/
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
/* wait on dio to ensure i_size has settled */
|
|
inode_dio_wait(VFS_I(ip));
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0,
|
|
&tp);
|
|
if (error) {
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
return error;
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
/*
|
|
* Do not update the on-disk file size. If we update the
|
|
* on-disk file size and then the system crashes before the
|
|
* contents of the file are flushed to disk then the files
|
|
* may be full of holes (ie NULL files bug).
|
|
*/
|
|
error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
|
|
XFS_ISIZE(ip));
|
|
if (error) {
|
|
/*
|
|
* If we get an error at this point we simply don't
|
|
* bother truncating the file.
|
|
*/
|
|
xfs_trans_cancel(tp);
|
|
} else {
|
|
error = xfs_trans_commit(tp);
|
|
if (!error)
|
|
xfs_inode_clear_eofblocks_tag(ip);
|
|
}
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_alloc_file_space(
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len,
|
|
int alloc_type)
|
|
{
|
|
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;
|
|
struct xfs_defer_ops dfops;
|
|
uint qblocks, resblks, resrtextents;
|
|
int error;
|
|
|
|
trace_xfs_alloc_file_space(ip);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
if (len <= 0)
|
|
return -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.
|
|
*/
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks,
|
|
resrtextents, 0, &tp);
|
|
|
|
/*
|
|
* Check for running out of space
|
|
*/
|
|
if (error) {
|
|
/*
|
|
* Free the transaction structure.
|
|
*/
|
|
ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp));
|
|
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_defer_init(&dfops, &firstfsb);
|
|
error = xfs_bmapi_write(tp, ip, startoffset_fsb,
|
|
allocatesize_fsb, alloc_type, &firstfsb,
|
|
resblks, imapp, &nimaps, &dfops);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* Complete the transaction
|
|
*/
|
|
error = xfs_defer_finish(&tp, &dfops);
|
|
if (error)
|
|
goto error0;
|
|
|
|
error = xfs_trans_commit(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
if (error)
|
|
break;
|
|
|
|
allocated_fsb = imapp->br_blockcount;
|
|
|
|
if (nimaps == 0) {
|
|
error = -ENOSPC;
|
|
break;
|
|
}
|
|
|
|
startoffset_fsb += allocated_fsb;
|
|
allocatesize_fsb -= allocated_fsb;
|
|
}
|
|
|
|
return error;
|
|
|
|
error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
|
|
xfs_defer_cancel(&dfops);
|
|
xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
|
|
|
|
error1: /* Just cancel transaction */
|
|
xfs_trans_cancel(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
xfs_unmap_extent(
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t startoffset_fsb,
|
|
xfs_filblks_t len_fsb,
|
|
int *done)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_trans *tp;
|
|
struct xfs_defer_ops dfops;
|
|
xfs_fsblock_t firstfsb;
|
|
uint resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
|
|
int error;
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
|
|
if (error) {
|
|
ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp));
|
|
return error;
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, ip->i_gdquot,
|
|
ip->i_pdquot, resblks, 0, XFS_QMOPT_RES_REGBLKS);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
xfs_defer_init(&dfops, &firstfsb);
|
|
error = xfs_bunmapi(tp, ip, startoffset_fsb, len_fsb, 0, 2, &firstfsb,
|
|
&dfops, done);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
xfs_defer_ijoin(&dfops, ip);
|
|
error = xfs_defer_finish(&tp, &dfops);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
error = xfs_trans_commit(tp);
|
|
out_unlock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
|
|
out_bmap_cancel:
|
|
xfs_defer_cancel(&dfops);
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
goto out_unlock;
|
|
}
|
|
|
|
static int
|
|
xfs_adjust_extent_unmap_boundaries(
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t *startoffset_fsb,
|
|
xfs_fileoff_t *endoffset_fsb)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_bmbt_irec imap;
|
|
int nimap, error;
|
|
xfs_extlen_t mod = 0;
|
|
|
|
nimap = 1;
|
|
error = xfs_bmapi_read(ip, *startoffset_fsb, 1, &imap, &nimap, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
|
|
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
|
mod = do_mod(imap.br_startblock, 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)
|
|
return error;
|
|
|
|
if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
|
|
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
|
mod++;
|
|
if (mod && mod != mp->m_sb.sb_rextsize)
|
|
*endoffset_fsb -= mod;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xfs_flush_unmap_range(
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct inode *inode = VFS_I(ip);
|
|
xfs_off_t rounding, start, end;
|
|
int error;
|
|
|
|
/* wait for the completion of any pending DIOs */
|
|
inode_dio_wait(inode);
|
|
|
|
rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_SIZE);
|
|
start = round_down(offset, rounding);
|
|
end = round_up(offset + len, rounding) - 1;
|
|
|
|
error = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (error)
|
|
return error;
|
|
truncate_pagecache_range(inode, start, end);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_free_file_space(
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
xfs_fileoff_t startoffset_fsb;
|
|
xfs_fileoff_t endoffset_fsb;
|
|
int done = 0, error;
|
|
|
|
trace_xfs_free_file_space(ip);
|
|
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
if (len <= 0) /* if nothing being freed */
|
|
return 0;
|
|
|
|
error = xfs_flush_unmap_range(ip, offset, len);
|
|
if (error)
|
|
return error;
|
|
|
|
startoffset_fsb = XFS_B_TO_FSB(mp, offset);
|
|
endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
|
|
|
|
/*
|
|
* Need to zero the stuff we're not freeing, on disk. If it's a RT file
|
|
* and we can't use unwritten extents then we actually need to ensure
|
|
* to zero the whole extent, otherwise we just need to take of block
|
|
* boundaries, and xfs_bunmapi will handle the rest.
|
|
*/
|
|
if (XFS_IS_REALTIME_INODE(ip) &&
|
|
!xfs_sb_version_hasextflgbit(&mp->m_sb)) {
|
|
error = xfs_adjust_extent_unmap_boundaries(ip, &startoffset_fsb,
|
|
&endoffset_fsb);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
if (endoffset_fsb > startoffset_fsb) {
|
|
while (!done) {
|
|
error = xfs_unmap_extent(ip, startoffset_fsb,
|
|
endoffset_fsb - startoffset_fsb, &done);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now that we've unmap all full blocks we'll have to zero out any
|
|
* partial block at the beginning and/or end. xfs_zero_range is
|
|
* smart enough to skip any holes, including those we just created,
|
|
* but we must take care not to zero beyond EOF and enlarge i_size.
|
|
*/
|
|
|
|
if (offset >= XFS_ISIZE(ip))
|
|
return 0;
|
|
|
|
if (offset + len > XFS_ISIZE(ip))
|
|
len = XFS_ISIZE(ip) - offset;
|
|
|
|
return xfs_zero_range(ip, offset, len, NULL);
|
|
}
|
|
|
|
/*
|
|
* Preallocate and zero a range of a file. This mechanism has the allocation
|
|
* semantics of fallocate and in addition converts data in the range to zeroes.
|
|
*/
|
|
int
|
|
xfs_zero_file_space(
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
uint blksize;
|
|
int error;
|
|
|
|
trace_xfs_zero_file_space(ip);
|
|
|
|
blksize = 1 << mp->m_sb.sb_blocklog;
|
|
|
|
/*
|
|
* Punch a hole and prealloc the range. We use hole punch rather than
|
|
* unwritten extent conversion for two reasons:
|
|
*
|
|
* 1.) Hole punch handles partial block zeroing for us.
|
|
*
|
|
* 2.) If prealloc returns ENOSPC, the file range is still zero-valued
|
|
* by virtue of the hole punch.
|
|
*/
|
|
error = xfs_free_file_space(ip, offset, len);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = xfs_alloc_file_space(ip, round_down(offset, blksize),
|
|
round_up(offset + len, blksize) -
|
|
round_down(offset, blksize),
|
|
XFS_BMAPI_PREALLOC);
|
|
out:
|
|
return error;
|
|
|
|
}
|
|
|
|
static int
|
|
xfs_prepare_shift(
|
|
struct xfs_inode *ip,
|
|
loff_t offset)
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* Trim eofblocks to avoid shifting uninitialized post-eof preallocation
|
|
* into the accessible region of the file.
|
|
*/
|
|
if (xfs_can_free_eofblocks(ip, true)) {
|
|
error = xfs_free_eofblocks(ip);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Writeback and invalidate cache for the remainder of the file as we're
|
|
* about to shift down every extent from offset to EOF.
|
|
*/
|
|
error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, offset, -1);
|
|
if (error)
|
|
return error;
|
|
error = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping,
|
|
offset >> PAGE_SHIFT, -1);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Clean out anything hanging around in the cow fork now that
|
|
* we've flushed all the dirty data out to disk to avoid having
|
|
* CoW extents at the wrong offsets.
|
|
*/
|
|
if (xfs_is_reflink_inode(ip)) {
|
|
error = xfs_reflink_cancel_cow_range(ip, offset, NULLFILEOFF,
|
|
true);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* xfs_collapse_file_space()
|
|
* This routine frees disk space and shift extent for the given file.
|
|
* The first thing we do is to free data blocks in the specified range
|
|
* by calling xfs_free_file_space(). It would also sync dirty data
|
|
* and invalidate page cache over the region on which collapse range
|
|
* is working. And Shift extent records to the left to cover a hole.
|
|
* RETURNS:
|
|
* 0 on success
|
|
* errno on error
|
|
*
|
|
*/
|
|
int
|
|
xfs_collapse_file_space(
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
struct xfs_defer_ops dfops;
|
|
xfs_fsblock_t first_block;
|
|
xfs_fileoff_t stop_fsb = XFS_B_TO_FSB(mp, VFS_I(ip)->i_size);
|
|
xfs_fileoff_t next_fsb = XFS_B_TO_FSB(mp, offset + len);
|
|
xfs_fileoff_t shift_fsb = XFS_B_TO_FSB(mp, len);
|
|
uint resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
|
|
bool done = false;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
|
|
|
|
trace_xfs_collapse_file_space(ip);
|
|
|
|
error = xfs_free_file_space(ip, offset, len);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_prepare_shift(ip, offset);
|
|
if (error)
|
|
return error;
|
|
|
|
while (!error && !done) {
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0,
|
|
&tp);
|
|
if (error)
|
|
break;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot,
|
|
ip->i_gdquot, ip->i_pdquot, resblks, 0,
|
|
XFS_QMOPT_RES_REGBLKS);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
|
|
xfs_defer_init(&dfops, &first_block);
|
|
error = xfs_bmap_collapse_extents(tp, ip, &next_fsb, shift_fsb,
|
|
&done, stop_fsb, &first_block, &dfops);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
error = xfs_defer_finish(&tp, &dfops);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
error = xfs_trans_commit(tp);
|
|
}
|
|
|
|
return error;
|
|
|
|
out_bmap_cancel:
|
|
xfs_defer_cancel(&dfops);
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* xfs_insert_file_space()
|
|
* This routine create hole space by shifting extents for the given file.
|
|
* The first thing we do is to sync dirty data and invalidate page cache
|
|
* over the region on which insert range is working. And split an extent
|
|
* to two extents at given offset by calling xfs_bmap_split_extent.
|
|
* And shift all extent records which are laying between [offset,
|
|
* last allocated extent] to the right to reserve hole range.
|
|
* RETURNS:
|
|
* 0 on success
|
|
* errno on error
|
|
*/
|
|
int
|
|
xfs_insert_file_space(
|
|
struct xfs_inode *ip,
|
|
loff_t offset,
|
|
loff_t len)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
struct xfs_defer_ops dfops;
|
|
xfs_fsblock_t first_block;
|
|
xfs_fileoff_t stop_fsb = XFS_B_TO_FSB(mp, offset);
|
|
xfs_fileoff_t next_fsb = NULLFSBLOCK;
|
|
xfs_fileoff_t shift_fsb = XFS_B_TO_FSB(mp, len);
|
|
bool done = false;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
|
|
|
|
trace_xfs_insert_file_space(ip);
|
|
|
|
error = xfs_prepare_shift(ip, offset);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* The extent shifting code works on extent granularity. So, if stop_fsb
|
|
* is not the starting block of extent, we need to split the extent at
|
|
* stop_fsb.
|
|
*/
|
|
error = xfs_bmap_split_extent(ip, stop_fsb);
|
|
if (error)
|
|
return error;
|
|
|
|
while (!error && !done) {
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, 0,
|
|
&tp);
|
|
if (error)
|
|
break;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
xfs_defer_init(&dfops, &first_block);
|
|
error = xfs_bmap_insert_extents(tp, ip, &next_fsb, shift_fsb,
|
|
&done, stop_fsb, &first_block, &dfops);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
error = xfs_defer_finish(&tp, &dfops);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
error = xfs_trans_commit(tp);
|
|
}
|
|
|
|
return error;
|
|
|
|
out_bmap_cancel:
|
|
xfs_defer_cancel(&dfops);
|
|
xfs_trans_cancel(tp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* We need to check that the format of the data fork in the temporary inode is
|
|
* valid for the target inode before doing the swap. This is not a problem with
|
|
* attr1 because of the fixed fork offset, but attr2 has a dynamically sized
|
|
* data fork depending on the space the attribute fork is taking so we can get
|
|
* invalid formats on the target inode.
|
|
*
|
|
* E.g. target has space for 7 extents in extent format, temp inode only has
|
|
* space for 6. If we defragment down to 7 extents, then the tmp format is a
|
|
* btree, but when swapped it needs to be in extent format. Hence we can't just
|
|
* blindly swap data forks on attr2 filesystems.
|
|
*
|
|
* Note that we check the swap in both directions so that we don't end up with
|
|
* a corrupt temporary inode, either.
|
|
*
|
|
* Note that fixing the way xfs_fsr sets up the attribute fork in the source
|
|
* inode will prevent this situation from occurring, so all we do here is
|
|
* reject and log the attempt. basically we are putting the responsibility on
|
|
* userspace to get this right.
|
|
*/
|
|
static int
|
|
xfs_swap_extents_check_format(
|
|
struct xfs_inode *ip, /* target inode */
|
|
struct xfs_inode *tip) /* tmp inode */
|
|
{
|
|
|
|
/* Should never get a local format */
|
|
if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
|
|
tip->i_d.di_format == XFS_DINODE_FMT_LOCAL)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* if the target inode has less extents that then temporary inode then
|
|
* why did userspace call us?
|
|
*/
|
|
if (ip->i_d.di_nextents < tip->i_d.di_nextents)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If we have to use the (expensive) rmap swap method, we can
|
|
* handle any number of extents and any format.
|
|
*/
|
|
if (xfs_sb_version_hasrmapbt(&ip->i_mount->m_sb))
|
|
return 0;
|
|
|
|
/*
|
|
* if the target inode is in extent form and the temp inode is in btree
|
|
* form then we will end up with the target inode in the wrong format
|
|
* as we already know there are less extents in the temp inode.
|
|
*/
|
|
if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
|
|
tip->i_d.di_format == XFS_DINODE_FMT_BTREE)
|
|
return -EINVAL;
|
|
|
|
/* Check temp in extent form to max in target */
|
|
if (tip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
|
|
XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) >
|
|
XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
|
|
return -EINVAL;
|
|
|
|
/* Check target in extent form to max in temp */
|
|
if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
|
|
XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) >
|
|
XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If we are in a btree format, check that the temp root block will fit
|
|
* in the target and that it has enough extents to be in btree format
|
|
* in the target.
|
|
*
|
|
* Note that we have to be careful to allow btree->extent conversions
|
|
* (a common defrag case) which will occur when the temp inode is in
|
|
* extent format...
|
|
*/
|
|
if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
|
if (XFS_IFORK_Q(ip) &&
|
|
XFS_BMAP_BMDR_SPACE(tip->i_df.if_broot) > XFS_IFORK_BOFF(ip))
|
|
return -EINVAL;
|
|
if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <=
|
|
XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Reciprocal target->temp btree format checks */
|
|
if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
|
if (XFS_IFORK_Q(tip) &&
|
|
XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > XFS_IFORK_BOFF(tip))
|
|
return -EINVAL;
|
|
if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <=
|
|
XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK))
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xfs_swap_extent_flush(
|
|
struct xfs_inode *ip)
|
|
{
|
|
int error;
|
|
|
|
error = filemap_write_and_wait(VFS_I(ip)->i_mapping);
|
|
if (error)
|
|
return error;
|
|
truncate_pagecache_range(VFS_I(ip), 0, -1);
|
|
|
|
/* Verify O_DIRECT for ftmp */
|
|
if (VFS_I(ip)->i_mapping->nrpages)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Move extents from one file to another, when rmap is enabled.
|
|
*/
|
|
STATIC int
|
|
xfs_swap_extent_rmap(
|
|
struct xfs_trans **tpp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_inode *tip)
|
|
{
|
|
struct xfs_bmbt_irec irec;
|
|
struct xfs_bmbt_irec uirec;
|
|
struct xfs_bmbt_irec tirec;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_fileoff_t end_fsb;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_fsblock_t firstfsb;
|
|
struct xfs_defer_ops dfops;
|
|
int error;
|
|
xfs_filblks_t ilen;
|
|
xfs_filblks_t rlen;
|
|
int nimaps;
|
|
uint64_t tip_flags2;
|
|
|
|
/*
|
|
* If the source file has shared blocks, we must flag the donor
|
|
* file as having shared blocks so that we get the shared-block
|
|
* rmap functions when we go to fix up the rmaps. The flags
|
|
* will be switch for reals later.
|
|
*/
|
|
tip_flags2 = tip->i_d.di_flags2;
|
|
if (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)
|
|
tip->i_d.di_flags2 |= XFS_DIFLAG2_REFLINK;
|
|
|
|
offset_fsb = 0;
|
|
end_fsb = XFS_B_TO_FSB(ip->i_mount, i_size_read(VFS_I(ip)));
|
|
count_fsb = (xfs_filblks_t)(end_fsb - offset_fsb);
|
|
|
|
while (count_fsb) {
|
|
/* Read extent from the donor file */
|
|
nimaps = 1;
|
|
error = xfs_bmapi_read(tip, offset_fsb, count_fsb, &tirec,
|
|
&nimaps, 0);
|
|
if (error)
|
|
goto out;
|
|
ASSERT(nimaps == 1);
|
|
ASSERT(tirec.br_startblock != DELAYSTARTBLOCK);
|
|
|
|
trace_xfs_swap_extent_rmap_remap(tip, &tirec);
|
|
ilen = tirec.br_blockcount;
|
|
|
|
/* Unmap the old blocks in the source file. */
|
|
while (tirec.br_blockcount) {
|
|
xfs_defer_init(&dfops, &firstfsb);
|
|
trace_xfs_swap_extent_rmap_remap_piece(tip, &tirec);
|
|
|
|
/* Read extent from the source file */
|
|
nimaps = 1;
|
|
error = xfs_bmapi_read(ip, tirec.br_startoff,
|
|
tirec.br_blockcount, &irec,
|
|
&nimaps, 0);
|
|
if (error)
|
|
goto out_defer;
|
|
ASSERT(nimaps == 1);
|
|
ASSERT(tirec.br_startoff == irec.br_startoff);
|
|
trace_xfs_swap_extent_rmap_remap_piece(ip, &irec);
|
|
|
|
/* Trim the extent. */
|
|
uirec = tirec;
|
|
uirec.br_blockcount = rlen = min_t(xfs_filblks_t,
|
|
tirec.br_blockcount,
|
|
irec.br_blockcount);
|
|
trace_xfs_swap_extent_rmap_remap_piece(tip, &uirec);
|
|
|
|
/* Remove the mapping from the donor file. */
|
|
error = xfs_bmap_unmap_extent((*tpp)->t_mountp, &dfops,
|
|
tip, &uirec);
|
|
if (error)
|
|
goto out_defer;
|
|
|
|
/* Remove the mapping from the source file. */
|
|
error = xfs_bmap_unmap_extent((*tpp)->t_mountp, &dfops,
|
|
ip, &irec);
|
|
if (error)
|
|
goto out_defer;
|
|
|
|
/* Map the donor file's blocks into the source file. */
|
|
error = xfs_bmap_map_extent((*tpp)->t_mountp, &dfops,
|
|
ip, &uirec);
|
|
if (error)
|
|
goto out_defer;
|
|
|
|
/* Map the source file's blocks into the donor file. */
|
|
error = xfs_bmap_map_extent((*tpp)->t_mountp, &dfops,
|
|
tip, &irec);
|
|
if (error)
|
|
goto out_defer;
|
|
|
|
xfs_defer_ijoin(&dfops, ip);
|
|
error = xfs_defer_finish(tpp, &dfops);
|
|
if (error)
|
|
goto out_defer;
|
|
|
|
tirec.br_startoff += rlen;
|
|
if (tirec.br_startblock != HOLESTARTBLOCK &&
|
|
tirec.br_startblock != DELAYSTARTBLOCK)
|
|
tirec.br_startblock += rlen;
|
|
tirec.br_blockcount -= rlen;
|
|
}
|
|
|
|
/* Roll on... */
|
|
count_fsb -= ilen;
|
|
offset_fsb += ilen;
|
|
}
|
|
|
|
tip->i_d.di_flags2 = tip_flags2;
|
|
return 0;
|
|
|
|
out_defer:
|
|
xfs_defer_cancel(&dfops);
|
|
out:
|
|
trace_xfs_swap_extent_rmap_error(ip, error, _RET_IP_);
|
|
tip->i_d.di_flags2 = tip_flags2;
|
|
return error;
|
|
}
|
|
|
|
/* Swap the extents of two files by swapping data forks. */
|
|
STATIC int
|
|
xfs_swap_extent_forks(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_inode *tip,
|
|
int *src_log_flags,
|
|
int *target_log_flags)
|
|
{
|
|
struct xfs_ifork tempifp, *ifp, *tifp;
|
|
xfs_filblks_t aforkblks = 0;
|
|
xfs_filblks_t taforkblks = 0;
|
|
xfs_extnum_t junk;
|
|
uint64_t tmp;
|
|
int error;
|
|
|
|
/*
|
|
* Count the number of extended attribute blocks
|
|
*/
|
|
if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
|
|
(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
|
|
error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &junk,
|
|
&aforkblks);
|
|
if (error)
|
|
return error;
|
|
}
|
|
if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
|
|
(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
|
|
error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, &junk,
|
|
&taforkblks);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Btree format (v3) inodes have the inode number stamped in the bmbt
|
|
* block headers. We can't start changing the bmbt blocks until the
|
|
* inode owner change is logged so recovery does the right thing in the
|
|
* event of a crash. Set the owner change log flags now and leave the
|
|
* bmbt scan as the last step.
|
|
*/
|
|
if (ip->i_d.di_version == 3 &&
|
|
ip->i_d.di_format == XFS_DINODE_FMT_BTREE)
|
|
(*target_log_flags) |= XFS_ILOG_DOWNER;
|
|
if (tip->i_d.di_version == 3 &&
|
|
tip->i_d.di_format == XFS_DINODE_FMT_BTREE)
|
|
(*src_log_flags) |= XFS_ILOG_DOWNER;
|
|
|
|
/*
|
|
* Swap the data forks of the inodes
|
|
*/
|
|
ifp = &ip->i_df;
|
|
tifp = &tip->i_df;
|
|
tempifp = *ifp; /* struct copy */
|
|
*ifp = *tifp; /* struct copy */
|
|
*tifp = tempifp; /* struct copy */
|
|
|
|
/*
|
|
* Fix the on-disk inode values
|
|
*/
|
|
tmp = (uint64_t)ip->i_d.di_nblocks;
|
|
ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
|
|
tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
|
|
|
|
tmp = (uint64_t) ip->i_d.di_nextents;
|
|
ip->i_d.di_nextents = tip->i_d.di_nextents;
|
|
tip->i_d.di_nextents = tmp;
|
|
|
|
tmp = (uint64_t) ip->i_d.di_format;
|
|
ip->i_d.di_format = tip->i_d.di_format;
|
|
tip->i_d.di_format = tmp;
|
|
|
|
/*
|
|
* The extents in the source inode could still contain speculative
|
|
* preallocation beyond EOF (e.g. the file is open but not modified
|
|
* while defrag is in progress). In that case, we need to copy over the
|
|
* number of delalloc blocks the data fork in the source inode is
|
|
* tracking beyond EOF so that when the fork is truncated away when the
|
|
* temporary inode is unlinked we don't underrun the i_delayed_blks
|
|
* counter on that inode.
|
|
*/
|
|
ASSERT(tip->i_delayed_blks == 0);
|
|
tip->i_delayed_blks = ip->i_delayed_blks;
|
|
ip->i_delayed_blks = 0;
|
|
|
|
switch (ip->i_d.di_format) {
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
(*src_log_flags) |= XFS_ILOG_DEXT;
|
|
break;
|
|
case XFS_DINODE_FMT_BTREE:
|
|
ASSERT(ip->i_d.di_version < 3 ||
|
|
(*src_log_flags & XFS_ILOG_DOWNER));
|
|
(*src_log_flags) |= XFS_ILOG_DBROOT;
|
|
break;
|
|
}
|
|
|
|
switch (tip->i_d.di_format) {
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
(*target_log_flags) |= XFS_ILOG_DEXT;
|
|
break;
|
|
case XFS_DINODE_FMT_BTREE:
|
|
(*target_log_flags) |= XFS_ILOG_DBROOT;
|
|
ASSERT(tip->i_d.di_version < 3 ||
|
|
(*target_log_flags & XFS_ILOG_DOWNER));
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Fix up the owners of the bmbt blocks to refer to the current inode. The
|
|
* change owner scan attempts to order all modified buffers in the current
|
|
* transaction. In the event of ordered buffer failure, the offending buffer is
|
|
* physically logged as a fallback and the scan returns -EAGAIN. We must roll
|
|
* the transaction in this case to replenish the fallback log reservation and
|
|
* restart the scan. This process repeats until the scan completes.
|
|
*/
|
|
static int
|
|
xfs_swap_change_owner(
|
|
struct xfs_trans **tpp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_inode *tmpip)
|
|
{
|
|
int error;
|
|
struct xfs_trans *tp = *tpp;
|
|
|
|
do {
|
|
error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK, ip->i_ino,
|
|
NULL);
|
|
/* success or fatal error */
|
|
if (error != -EAGAIN)
|
|
break;
|
|
|
|
error = xfs_trans_roll(tpp);
|
|
if (error)
|
|
break;
|
|
tp = *tpp;
|
|
|
|
/*
|
|
* Redirty both inodes so they can relog and keep the log tail
|
|
* moving forward.
|
|
*/
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
xfs_trans_ijoin(tp, tmpip, 0);
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
xfs_trans_log_inode(tp, tmpip, XFS_ILOG_CORE);
|
|
} while (true);
|
|
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_swap_extents(
|
|
struct xfs_inode *ip, /* target inode */
|
|
struct xfs_inode *tip, /* tmp inode */
|
|
struct xfs_swapext *sxp)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_trans *tp;
|
|
struct xfs_bstat *sbp = &sxp->sx_stat;
|
|
int src_log_flags, target_log_flags;
|
|
int error = 0;
|
|
int lock_flags;
|
|
struct xfs_ifork *cowfp;
|
|
uint64_t f;
|
|
int resblks = 0;
|
|
|
|
/*
|
|
* Lock the inodes against other IO, page faults and truncate to
|
|
* begin with. Then we can ensure the inodes are flushed and have no
|
|
* page cache safely. Once we have done this we can take the ilocks and
|
|
* do the rest of the checks.
|
|
*/
|
|
lock_two_nondirectories(VFS_I(ip), VFS_I(tip));
|
|
lock_flags = XFS_MMAPLOCK_EXCL;
|
|
xfs_lock_two_inodes(ip, XFS_MMAPLOCK_EXCL, tip, XFS_MMAPLOCK_EXCL);
|
|
|
|
/* Verify that both files have the same format */
|
|
if ((VFS_I(ip)->i_mode & S_IFMT) != (VFS_I(tip)->i_mode & S_IFMT)) {
|
|
error = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Verify both files are either real-time or non-realtime */
|
|
if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
|
|
error = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
error = xfs_swap_extent_flush(ip);
|
|
if (error)
|
|
goto out_unlock;
|
|
error = xfs_swap_extent_flush(tip);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Extent "swapping" with rmap requires a permanent reservation and
|
|
* a block reservation because it's really just a remap operation
|
|
* performed with log redo items!
|
|
*/
|
|
if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
|
|
/*
|
|
* Conceptually this shouldn't affect the shape of either
|
|
* bmbt, but since we atomically move extents one by one,
|
|
* we reserve enough space to rebuild both trees.
|
|
*/
|
|
resblks = XFS_SWAP_RMAP_SPACE_RES(mp,
|
|
XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK),
|
|
XFS_DATA_FORK) +
|
|
XFS_SWAP_RMAP_SPACE_RES(mp,
|
|
XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK),
|
|
XFS_DATA_FORK);
|
|
}
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Lock and join the inodes to the tansaction so that transaction commit
|
|
* or cancel will unlock the inodes from this point onwards.
|
|
*/
|
|
xfs_lock_two_inodes(ip, XFS_ILOCK_EXCL, tip, XFS_ILOCK_EXCL);
|
|
lock_flags |= XFS_ILOCK_EXCL;
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
xfs_trans_ijoin(tp, tip, 0);
|
|
|
|
|
|
/* Verify all data are being swapped */
|
|
if (sxp->sx_offset != 0 ||
|
|
sxp->sx_length != ip->i_d.di_size ||
|
|
sxp->sx_length != tip->i_d.di_size) {
|
|
error = -EFAULT;
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
trace_xfs_swap_extent_before(ip, 0);
|
|
trace_xfs_swap_extent_before(tip, 1);
|
|
|
|
/* check inode formats now that data is flushed */
|
|
error = xfs_swap_extents_check_format(ip, tip);
|
|
if (error) {
|
|
xfs_notice(mp,
|
|
"%s: inode 0x%llx format is incompatible for exchanging.",
|
|
__func__, ip->i_ino);
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
/*
|
|
* Compare the current change & modify times with that
|
|
* passed in. If they differ, we abort this swap.
|
|
* This is the mechanism used to ensure the calling
|
|
* process that the file was not changed out from
|
|
* under it.
|
|
*/
|
|
if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) ||
|
|
(sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) ||
|
|
(sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) ||
|
|
(sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) {
|
|
error = -EBUSY;
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
/*
|
|
* Note the trickiness in setting the log flags - we set the owner log
|
|
* flag on the opposite inode (i.e. the inode we are setting the new
|
|
* owner to be) because once we swap the forks and log that, log
|
|
* recovery is going to see the fork as owned by the swapped inode,
|
|
* not the pre-swapped inodes.
|
|
*/
|
|
src_log_flags = XFS_ILOG_CORE;
|
|
target_log_flags = XFS_ILOG_CORE;
|
|
|
|
if (xfs_sb_version_hasrmapbt(&mp->m_sb))
|
|
error = xfs_swap_extent_rmap(&tp, ip, tip);
|
|
else
|
|
error = xfs_swap_extent_forks(tp, ip, tip, &src_log_flags,
|
|
&target_log_flags);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
/* Do we have to swap reflink flags? */
|
|
if ((ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) ^
|
|
(tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)) {
|
|
f = ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
|
|
ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
|
|
ip->i_d.di_flags2 |= tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
|
|
tip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
|
|
tip->i_d.di_flags2 |= f & XFS_DIFLAG2_REFLINK;
|
|
}
|
|
|
|
/* Swap the cow forks. */
|
|
if (xfs_sb_version_hasreflink(&mp->m_sb)) {
|
|
xfs_extnum_t extnum;
|
|
|
|
ASSERT(ip->i_cformat == XFS_DINODE_FMT_EXTENTS);
|
|
ASSERT(tip->i_cformat == XFS_DINODE_FMT_EXTENTS);
|
|
|
|
extnum = ip->i_cnextents;
|
|
ip->i_cnextents = tip->i_cnextents;
|
|
tip->i_cnextents = extnum;
|
|
|
|
cowfp = ip->i_cowfp;
|
|
ip->i_cowfp = tip->i_cowfp;
|
|
tip->i_cowfp = cowfp;
|
|
|
|
if (ip->i_cowfp && ip->i_cnextents)
|
|
xfs_inode_set_cowblocks_tag(ip);
|
|
else
|
|
xfs_inode_clear_cowblocks_tag(ip);
|
|
if (tip->i_cowfp && tip->i_cnextents)
|
|
xfs_inode_set_cowblocks_tag(tip);
|
|
else
|
|
xfs_inode_clear_cowblocks_tag(tip);
|
|
}
|
|
|
|
xfs_trans_log_inode(tp, ip, src_log_flags);
|
|
xfs_trans_log_inode(tp, tip, target_log_flags);
|
|
|
|
/*
|
|
* The extent forks have been swapped, but crc=1,rmapbt=0 filesystems
|
|
* have inode number owner values in the bmbt blocks that still refer to
|
|
* the old inode. Scan each bmbt to fix up the owner values with the
|
|
* inode number of the current inode.
|
|
*/
|
|
if (src_log_flags & XFS_ILOG_DOWNER) {
|
|
error = xfs_swap_change_owner(&tp, ip, tip);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
}
|
|
if (target_log_flags & XFS_ILOG_DOWNER) {
|
|
error = xfs_swap_change_owner(&tp, tip, ip);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* transaction goes to disk before returning to the user.
|
|
*/
|
|
if (mp->m_flags & XFS_MOUNT_WSYNC)
|
|
xfs_trans_set_sync(tp);
|
|
|
|
error = xfs_trans_commit(tp);
|
|
|
|
trace_xfs_swap_extent_after(ip, 0);
|
|
trace_xfs_swap_extent_after(tip, 1);
|
|
|
|
out_unlock:
|
|
xfs_iunlock(ip, lock_flags);
|
|
xfs_iunlock(tip, lock_flags);
|
|
unlock_two_nondirectories(VFS_I(ip), VFS_I(tip));
|
|
return error;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
goto out_unlock;
|
|
}
|