![Dave Chinner](/assets/img/avatar_default.png)
do_mod() is a hold-over from when we have different sizes for file offsets and and other internal values for 40 bit XFS filesystems. Hence depending on build flags variables passed to do_mod() could change size. We no longer support those small format filesystems and hence everything is of fixed size theses days, even on 32 bit platforms. As such, we can convert all the do_mod() callers to platform optimised modulus operations as defined by linux/math64.h. Individual conversions depend on the types of variables being used. Signed-Off-By: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2057 lines
53 KiB
C
2057 lines
53 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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 mod = 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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div_u64_rem(ap->offset, align, &mod);
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if (mod || 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,
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int64_t bmv_end,
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xfs_fileoff_t bno,
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xfs_fileoff_t end)
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{
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struct kgetbmap *p = out + bmv->bmv_entries;
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if (bmv->bmv_iflags & BMV_IF_NO_HOLES)
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|
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);
|
|
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_flags(&tp, ip, XFS_DATA_FORK,
|
|
XFS_ISIZE(ip), XFS_BMAPI_NODISCARD);
|
|
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);
|
|
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;
|
|
div_u64_rem(startoffset_fsb, extsz, &temp);
|
|
if (temp)
|
|
e += temp;
|
|
div_u64_rem(e, extsz, &temp);
|
|
if (temp)
|
|
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);
|
|
div_u64_rem(imap.br_startblock, mp->m_sb.sb_rextsize, &mod);
|
|
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);
|
|
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. iomap_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 iomap_zero_range(VFS_I(ip), offset, len, NULL, &xfs_iomap_ops);
|
|
}
|
|
|
|
/*
|
|
* 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 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, &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)) {
|
|
int w = XFS_DATA_FORK;
|
|
uint32_t ipnext = XFS_IFORK_NEXTENTS(ip, w);
|
|
uint32_t tipnext = XFS_IFORK_NEXTENTS(tip, w);
|
|
|
|
/*
|
|
* 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, ipnext, w);
|
|
resblks += XFS_SWAP_RMAP_SPACE_RES(mp, tipnext, w);
|
|
|
|
/*
|
|
* Handle the corner case where either inode might straddle the
|
|
* btree format boundary. If so, the inode could bounce between
|
|
* btree <-> extent format on unmap -> remap cycles, freeing and
|
|
* allocating a bmapbt block each time.
|
|
*/
|
|
if (ipnext == (XFS_IFORK_MAXEXT(ip, w) + 1))
|
|
resblks += XFS_IFORK_MAXEXT(ip, w);
|
|
if (tipnext == (XFS_IFORK_MAXEXT(tip, w) + 1))
|
|
resblks += XFS_IFORK_MAXEXT(tip, w);
|
|
}
|
|
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_cowfp->if_bytes)
|
|
xfs_inode_set_cowblocks_tag(ip);
|
|
else
|
|
xfs_inode_clear_cowblocks_tag(ip);
|
|
if (tip->i_cowfp && tip->i_cowfp->if_bytes)
|
|
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;
|
|
}
|