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![Darrick J. Wong](/assets/img/avatar_default.png)
Swapping extents between two inodes requires the owner to be updated in the rmap tree for all the extents that are swapped. This code does not yet exist, so switch off the XFS_IOC_SWAPEXT ioctl until support has been implemented. This will need to be done before the rmap btree code can have the experimental tag removed. This functionality will be provided in a (much) later patch, using some of the reflink deferred block remapping functionality to accomlish extent swapping with rmap updates. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
1776 lines
48 KiB
C
1776 lines
48 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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/* 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, true);
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}
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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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xfs_alloctype_t atype = 0; /* type for allocation routines */
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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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atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
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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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if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length,
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&ralen, atype, ap->wasdel, prod, &rtb)))
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return error;
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if (rtb == NULLFSBLOCK && prod > 1 &&
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(error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1,
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ap->length, &ralen, atype,
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ap->wasdel, 1, &rtb)))
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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->userdata & 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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/*
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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.
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*/
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STATIC void
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xfs_bmap_count_leaves(
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xfs_ifork_t *ifp,
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xfs_extnum_t idx,
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int numrecs,
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int *count)
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{
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int b;
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for (b = 0; b < numrecs; b++) {
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xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
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*count += xfs_bmbt_get_blockcount(frp);
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}
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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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int *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 /* error */
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xfs_bmap_count_tree(
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xfs_mount_t *mp, /* file system mount point */
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xfs_trans_t *tp, /* transaction pointer */
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xfs_ifork_t *ifp, /* inode fork pointer */
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xfs_fsblock_t blockno, /* file system block number */
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int levelin, /* level in btree */
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int *count) /* Count of blocks */
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{
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int error;
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xfs_buf_t *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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if (unlikely((error =
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xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
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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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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.
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*/
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static int /* error */
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xfs_bmap_count_blocks(
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xfs_trans_t *tp, /* transaction pointer */
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xfs_inode_t *ip, /* incore inode */
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int whichfork, /* data or attr fork */
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int *count) /* out: count of blocks */
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{
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struct xfs_btree_block *block; /* current btree block */
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xfs_fsblock_t bno; /* block # of "block" */
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xfs_ifork_t *ifp; /* fork structure */
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int level; /* btree level, for checking */
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xfs_mount_t *mp; /* file system mount structure */
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__be64 *pp; /* pointer to block address */
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bno = NULLFSBLOCK;
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mp = ip->i_mount;
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ifp = XFS_IFORK_PTR(ip, whichfork);
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if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
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xfs_bmap_count_leaves(ifp, 0,
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ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
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count);
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return 0;
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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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if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
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XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
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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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/*
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* returns 1 for success, 0 if we failed to map the extent.
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*/
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STATIC int
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xfs_getbmapx_fix_eof_hole(
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xfs_inode_t *ip, /* xfs incore inode pointer */
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struct getbmapx *out, /* output structure */
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int prealloced, /* this is a file with
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* preallocated data space */
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__int64_t end, /* last block requested */
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xfs_fsblock_t startblock)
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{
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__int64_t fixlen;
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xfs_mount_t *mp; /* file system mount point */
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xfs_ifork_t *ifp; /* inode fork pointer */
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xfs_extnum_t lastx; /* last extent pointer */
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xfs_fileoff_t fileblock;
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if (startblock == HOLESTARTBLOCK) {
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mp = ip->i_mount;
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out->bmv_block = -1;
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fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip)));
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fixlen -= out->bmv_offset;
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if (prealloced && out->bmv_offset + out->bmv_length == end) {
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/* Came to hole at EOF. Trim it. */
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if (fixlen <= 0)
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return 0;
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out->bmv_length = fixlen;
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}
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} else {
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if (startblock == DELAYSTARTBLOCK)
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out->bmv_block = -2;
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else
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out->bmv_block = xfs_fsb_to_db(ip, startblock);
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fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
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ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
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if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
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(lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
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out->bmv_oflags |= BMV_OF_LAST;
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}
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return 1;
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}
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|
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/*
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* Get inode's extents as described in bmv, and format for output.
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* Calls formatter to fill the user's buffer until all extents
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* are mapped, until the passed-in bmv->bmv_count slots have
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* been filled, or until the formatter short-circuits the loop,
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* if it is tracking filled-in extents on its own.
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*/
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int /* error code */
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xfs_getbmap(
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xfs_inode_t *ip,
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struct getbmapx *bmv, /* user bmap structure */
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xfs_bmap_format_t formatter, /* format to user */
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void *arg) /* formatter arg */
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{
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__int64_t bmvend; /* last block requested */
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|
int error = 0; /* return value */
|
|
__int64_t fixlen; /* length for -1 case */
|
|
int i; /* extent number */
|
|
int lock; /* lock state */
|
|
xfs_bmbt_irec_t *map; /* buffer for user's data */
|
|
xfs_mount_t *mp; /* file system mount point */
|
|
int nex; /* # of user extents can do */
|
|
int nexleft; /* # of user extents left */
|
|
int subnex; /* # of bmapi's can do */
|
|
int nmap; /* number of map entries */
|
|
struct getbmapx *out; /* output structure */
|
|
int whichfork; /* data or attr fork */
|
|
int prealloced; /* this is a file with
|
|
* preallocated data space */
|
|
int iflags; /* interface flags */
|
|
int bmapi_flags; /* flags for xfs_bmapi */
|
|
int cur_ext = 0;
|
|
|
|
mp = ip->i_mount;
|
|
iflags = bmv->bmv_iflags;
|
|
whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
|
|
|
|
if (whichfork == XFS_ATTR_FORK) {
|
|
if (XFS_IFORK_Q(ip)) {
|
|
if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
|
|
ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
|
|
ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
|
|
return -EINVAL;
|
|
} else if (unlikely(
|
|
ip->i_d.di_aformat != 0 &&
|
|
ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
|
|
XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
|
|
ip->i_mount);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
prealloced = 0;
|
|
fixlen = 1LL << 32;
|
|
} else {
|
|
if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
|
|
ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
|
|
ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
|
|
return -EINVAL;
|
|
|
|
if (xfs_get_extsz_hint(ip) ||
|
|
ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
|
|
prealloced = 1;
|
|
fixlen = mp->m_super->s_maxbytes;
|
|
} else {
|
|
prealloced = 0;
|
|
fixlen = XFS_ISIZE(ip);
|
|
}
|
|
}
|
|
|
|
if (bmv->bmv_length == -1) {
|
|
fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
|
|
bmv->bmv_length =
|
|
max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
|
|
} else if (bmv->bmv_length == 0) {
|
|
bmv->bmv_entries = 0;
|
|
return 0;
|
|
} else if (bmv->bmv_length < 0) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
nex = bmv->bmv_count - 1;
|
|
if (nex <= 0)
|
|
return -EINVAL;
|
|
bmvend = bmv->bmv_offset + bmv->bmv_length;
|
|
|
|
|
|
if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
|
|
return -ENOMEM;
|
|
out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0);
|
|
if (!out)
|
|
return -ENOMEM;
|
|
|
|
xfs_ilock(ip, XFS_IOLOCK_SHARED);
|
|
if (whichfork == 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.
|
|
*/
|
|
}
|
|
|
|
lock = xfs_ilock_data_map_shared(ip);
|
|
} else {
|
|
lock = xfs_ilock_attr_map_shared(ip);
|
|
}
|
|
|
|
/*
|
|
* Don't let nex be bigger than the number of extents
|
|
* we can have assuming alternating holes and real extents.
|
|
*/
|
|
if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
|
|
nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
|
|
|
|
bmapi_flags = xfs_bmapi_aflag(whichfork);
|
|
if (!(iflags & BMV_IF_PREALLOC))
|
|
bmapi_flags |= XFS_BMAPI_IGSTATE;
|
|
|
|
/*
|
|
* Allocate enough space to handle "subnex" maps at a time.
|
|
*/
|
|
error = -ENOMEM;
|
|
subnex = 16;
|
|
map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
|
|
if (!map)
|
|
goto out_unlock_ilock;
|
|
|
|
bmv->bmv_entries = 0;
|
|
|
|
if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
|
|
(whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
|
|
error = 0;
|
|
goto out_free_map;
|
|
}
|
|
|
|
nexleft = nex;
|
|
|
|
do {
|
|
nmap = (nexleft > subnex) ? subnex : nexleft;
|
|
error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
|
|
XFS_BB_TO_FSB(mp, bmv->bmv_length),
|
|
map, &nmap, bmapi_flags);
|
|
if (error)
|
|
goto out_free_map;
|
|
ASSERT(nmap <= subnex);
|
|
|
|
for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
|
|
out[cur_ext].bmv_oflags = 0;
|
|
if (map[i].br_state == XFS_EXT_UNWRITTEN)
|
|
out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
|
|
else if (map[i].br_startblock == DELAYSTARTBLOCK)
|
|
out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
|
|
out[cur_ext].bmv_offset =
|
|
XFS_FSB_TO_BB(mp, map[i].br_startoff);
|
|
out[cur_ext].bmv_length =
|
|
XFS_FSB_TO_BB(mp, map[i].br_blockcount);
|
|
out[cur_ext].bmv_unused1 = 0;
|
|
out[cur_ext].bmv_unused2 = 0;
|
|
|
|
/*
|
|
* delayed allocation extents that start beyond EOF can
|
|
* occur due to speculative EOF allocation when the
|
|
* delalloc extent is larger than the largest freespace
|
|
* extent at conversion time. These extents cannot be
|
|
* converted by data writeback, so can exist here even
|
|
* if we are not supposed to be finding delalloc
|
|
* extents.
|
|
*/
|
|
if (map[i].br_startblock == DELAYSTARTBLOCK &&
|
|
map[i].br_startoff <= XFS_B_TO_FSB(mp, XFS_ISIZE(ip)))
|
|
ASSERT((iflags & BMV_IF_DELALLOC) != 0);
|
|
|
|
if (map[i].br_startblock == HOLESTARTBLOCK &&
|
|
whichfork == XFS_ATTR_FORK) {
|
|
/* came to the end of attribute fork */
|
|
out[cur_ext].bmv_oflags |= BMV_OF_LAST;
|
|
goto out_free_map;
|
|
}
|
|
|
|
if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
|
|
prealloced, bmvend,
|
|
map[i].br_startblock))
|
|
goto out_free_map;
|
|
|
|
bmv->bmv_offset =
|
|
out[cur_ext].bmv_offset +
|
|
out[cur_ext].bmv_length;
|
|
bmv->bmv_length =
|
|
max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
|
|
|
|
/*
|
|
* In case we don't want to return the hole,
|
|
* don't increase cur_ext so that we can reuse
|
|
* it in the next loop.
|
|
*/
|
|
if ((iflags & BMV_IF_NO_HOLES) &&
|
|
map[i].br_startblock == HOLESTARTBLOCK) {
|
|
memset(&out[cur_ext], 0, sizeof(out[cur_ext]));
|
|
continue;
|
|
}
|
|
|
|
nexleft--;
|
|
bmv->bmv_entries++;
|
|
cur_ext++;
|
|
}
|
|
} while (nmap && nexleft && bmv->bmv_length);
|
|
|
|
out_free_map:
|
|
kmem_free(map);
|
|
out_unlock_ilock:
|
|
xfs_iunlock(ip, lock);
|
|
out_unlock_iolock:
|
|
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
|
|
|
for (i = 0; i < cur_ext; i++) {
|
|
int full = 0; /* user array is full */
|
|
|
|
/* format results & advance arg */
|
|
error = formatter(&arg, &out[i], &full);
|
|
if (error || full)
|
|
break;
|
|
}
|
|
|
|
kmem_free(out);
|
|
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 by xfs_inactive to free any blocks beyond eof
|
|
* when the link count isn't zero and by xfs_dm_punch_hole() when
|
|
* punching a hole to EOF.
|
|
*/
|
|
int
|
|
xfs_free_eofblocks(
|
|
xfs_mount_t *mp,
|
|
xfs_inode_t *ip,
|
|
bool need_iolock)
|
|
{
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
xfs_fileoff_t end_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
xfs_filblks_t map_len;
|
|
int nimaps;
|
|
xfs_bmbt_irec_t imap;
|
|
|
|
/*
|
|
* 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 (!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;
|
|
|
|
/*
|
|
* There are blocks after the end of file.
|
|
* Free them up now by truncating the file to
|
|
* its current size.
|
|
*/
|
|
if (need_iolock) {
|
|
if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL))
|
|
return -EAGAIN;
|
|
}
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0,
|
|
&tp);
|
|
if (error) {
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
if (need_iolock)
|
|
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
|
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);
|
|
if (need_iolock)
|
|
xfs_iunlock(ip, XFS_IOLOCK_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, NULL);
|
|
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;
|
|
|
|
error = xfs_defer_finish(&tp, &dfops, ip);
|
|
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) {
|
|
xfs_daddr_t block;
|
|
|
|
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
|
block = imap.br_startblock;
|
|
mod = do_div(block, mp->m_sb.sb_rextsize);
|
|
if (mod)
|
|
*startoffset_fsb += mp->m_sb.sb_rextsize - mod;
|
|
}
|
|
|
|
nimap = 1;
|
|
error = xfs_bmapi_read(ip, *endoffset_fsb - 1, 1, &imap, &nimap, 0);
|
|
if (error)
|
|
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.
|
|
*/
|
|
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;
|
|
|
|
}
|
|
|
|
/*
|
|
* @next_fsb will keep track of the extent currently undergoing shift.
|
|
* @stop_fsb will keep track of the extent at which we have to stop.
|
|
* If we are shifting left, we will start with block (offset + len) and
|
|
* shift each extent till last extent.
|
|
* If we are shifting right, we will start with last extent inside file space
|
|
* and continue until we reach the block corresponding to offset.
|
|
*/
|
|
static int
|
|
xfs_shift_file_space(
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
xfs_off_t len,
|
|
enum shift_direction direction)
|
|
{
|
|
int done = 0;
|
|
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_fileoff_t next_fsb;
|
|
xfs_fileoff_t shift_fsb;
|
|
|
|
ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT);
|
|
|
|
if (direction == SHIFT_LEFT) {
|
|
next_fsb = XFS_B_TO_FSB(mp, offset + len);
|
|
stop_fsb = XFS_B_TO_FSB(mp, VFS_I(ip)->i_size);
|
|
} else {
|
|
/*
|
|
* If right shift, delegate the work of initialization of
|
|
* next_fsb to xfs_bmap_shift_extent as it has ilock held.
|
|
*/
|
|
next_fsb = NULLFSBLOCK;
|
|
stop_fsb = XFS_B_TO_FSB(mp, offset);
|
|
}
|
|
|
|
shift_fsb = XFS_B_TO_FSB(mp, len);
|
|
|
|
/*
|
|
* 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(mp, ip, false);
|
|
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;
|
|
|
|
/*
|
|
* The extent shiting 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.
|
|
*/
|
|
if (direction == SHIFT_RIGHT) {
|
|
error = xfs_bmap_split_extent(ip, stop_fsb);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
while (!error && !done) {
|
|
/*
|
|
* We would need to reserve permanent block for transaction.
|
|
* This will come into picture when after shifting extent into
|
|
* hole we found that adjacent extents can be merged which
|
|
* may lead to freeing of a block during record update.
|
|
*/
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write,
|
|
XFS_DIOSTRAT_SPACE_RES(mp, 0), 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,
|
|
XFS_DIOSTRAT_SPACE_RES(mp, 0), 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);
|
|
|
|
/*
|
|
* We are using the write transaction in which max 2 bmbt
|
|
* updates are allowed
|
|
*/
|
|
error = xfs_bmap_shift_extents(tp, ip, &next_fsb, shift_fsb,
|
|
&done, stop_fsb, &first_block, &dfops,
|
|
direction, XFS_BMAP_MAX_SHIFT_EXTENTS);
|
|
if (error)
|
|
goto out_bmap_cancel;
|
|
|
|
error = xfs_defer_finish(&tp, &dfops, NULL);
|
|
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_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)
|
|
{
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
trace_xfs_collapse_file_space(ip);
|
|
|
|
error = xfs_free_file_space(ip, offset, len);
|
|
if (error)
|
|
return error;
|
|
|
|
return xfs_shift_file_space(ip, offset, len, SHIFT_LEFT);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
trace_xfs_insert_file_space(ip);
|
|
|
|
return xfs_shift_file_space(ip, offset, len, SHIFT_RIGHT);
|
|
}
|
|
|
|
/*
|
|
* 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(
|
|
xfs_inode_t *ip, /* target inode */
|
|
xfs_inode_t *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 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_BOFF(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_BOFF(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;
|
|
}
|
|
|
|
int
|
|
xfs_swap_extents(
|
|
xfs_inode_t *ip, /* target inode */
|
|
xfs_inode_t *tip, /* tmp inode */
|
|
xfs_swapext_t *sxp)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_trans_t *tp;
|
|
xfs_bstat_t *sbp = &sxp->sx_stat;
|
|
xfs_ifork_t *tempifp, *ifp, *tifp;
|
|
int src_log_flags, target_log_flags;
|
|
int error = 0;
|
|
int aforkblks = 0;
|
|
int taforkblks = 0;
|
|
__uint64_t tmp;
|
|
int lock_flags;
|
|
|
|
/* XXX: we can't do this with rmap, will fix later */
|
|
if (xfs_sb_version_hasrmapbt(&mp->m_sb))
|
|
return -EOPNOTSUPP;
|
|
|
|
tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
|
|
if (!tempifp) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
|
|
xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
|
|
xfs_lock_two_inodes(ip, 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;
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 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, tip, XFS_ILOCK_EXCL);
|
|
lock_flags |= XFS_ILOCK_EXCL;
|
|
xfs_trans_ijoin(tp, ip, lock_flags);
|
|
xfs_trans_ijoin(tp, tip, lock_flags);
|
|
|
|
|
|
/* 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;
|
|
}
|
|
/*
|
|
* 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, &aforkblks);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
}
|
|
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,
|
|
&taforkblks);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
/*
|
|
* Before we've swapped the forks, lets set the owners of the forks
|
|
* appropriately. We have to do this as we are demand paging the btree
|
|
* buffers, and so the validation done on read will expect the owner
|
|
* field to be correctly set. Once we change the owners, we can swap the
|
|
* inode forks.
|
|
*
|
|
* 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 (ip->i_d.di_version == 3 &&
|
|
ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
|
target_log_flags |= XFS_ILOG_DOWNER;
|
|
error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK,
|
|
tip->i_ino, NULL);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
if (tip->i_d.di_version == 3 &&
|
|
tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
|
src_log_flags |= XFS_ILOG_DOWNER;
|
|
error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK,
|
|
ip->i_ino, NULL);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
/* If the extents fit in the inode, fix the
|
|
* pointer. Otherwise it's already NULL or
|
|
* pointing to the extent.
|
|
*/
|
|
if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
|
|
ifp->if_u1.if_extents =
|
|
ifp->if_u2.if_inline_ext;
|
|
}
|
|
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:
|
|
/* If the extents fit in the inode, fix the
|
|
* pointer. Otherwise it's already NULL or
|
|
* pointing to the extent.
|
|
*/
|
|
if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
|
|
tifp->if_u1.if_extents =
|
|
tifp->if_u2.if_inline_ext;
|
|
}
|
|
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;
|
|
}
|
|
|
|
xfs_trans_log_inode(tp, ip, src_log_flags);
|
|
xfs_trans_log_inode(tp, tip, target_log_flags);
|
|
|
|
/*
|
|
* 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:
|
|
kmem_free(tempifp);
|
|
return error;
|
|
|
|
out_unlock:
|
|
xfs_iunlock(ip, lock_flags);
|
|
xfs_iunlock(tip, lock_flags);
|
|
goto out;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
goto out;
|
|
}
|