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![ChenXiaoSong](/assets/img/avatar_default.png)
Reproducer:
1. fallocate -l 100M image
2. mkfs.xfs -f image
3. mount image /mnt
4. setxattr("/mnt", "trusted.overlay.upper", NULL, 0, XATTR_CREATE)
5. char arg[32] = "\x01\xff\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x08\x00\x00\x00\xc6\x2a\xf7";
fd = open("/mnt", O_RDONLY|O_DIRECTORY);
ioctl(fd, _IOC(_IOC_READ|_IOC_WRITE, 0x58, 0x2c, 0x20), arg);
NULL pointer dereference will occur when race happens between xfs_getbmap()
and xfs_bmap_set_attrforkoff():
ioctl | setxattr
----------------------------|---------------------------
xfs_getbmap |
xfs_ifork_ptr |
xfs_inode_has_attr_fork |
ip->i_forkoff == 0 |
return NULL |
ifp == NULL |
| xfs_bmap_set_attrforkoff
| ip->i_forkoff > 0
xfs_inode_has_attr_fork |
ip->i_forkoff > 0 |
ifp == NULL |
ifp->if_format |
Fix this by locking i_lock before xfs_ifork_ptr().
Fixes: abbf9e8a45
("xfs: rewrite getbmap using the xfs_iext_* helpers")
Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
Signed-off-by: Guo Xuenan <guoxuenan@huawei.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: added fixes tag]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
1856 lines
48 KiB
C
1856 lines
48 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_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_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_iomap.h"
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#include "xfs_reflink.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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if (XFS_IS_REALTIME_INODE(ip))
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return XFS_FSB_TO_BB(ip->i_mount, fsb);
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return 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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struct xfs_buftarg *target = xfs_inode_buftarg(ip);
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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(target->bt_bdev,
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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)
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{
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struct xfs_mount *mp = ap->ip->i_mount;
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xfs_fileoff_t orig_offset = ap->offset;
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xfs_rtblock_t rtb;
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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_extlen_t orig_length = ap->length;
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xfs_extlen_t minlen = mp->m_sb.sb_rextsize;
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xfs_extlen_t raminlen;
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bool rtlocked = false;
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bool ignore_locality = false;
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int error;
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align = xfs_get_extsz_hint(ap->ip);
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retry:
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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 we shifted the file offset downward to satisfy an extent size
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* hint, increase minlen by that amount so that the allocator won't
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* give us an allocation that's too short to cover at least one of the
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* blocks that the caller asked for.
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*/
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if (ap->offset != orig_offset)
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minlen += orig_offset - ap->offset;
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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 XFS_BMBT_MAX_EXTLEN 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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* XFS_BMBT_MAX_EXTLEN), 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 >= XFS_MAX_BMBT_EXTLEN)
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ralen = XFS_MAX_BMBT_EXTLEN / 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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if (!rtlocked) {
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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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rtlocked = true;
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}
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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 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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if (ignore_locality)
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ap->blkno = 0;
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else
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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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raminlen = max_t(xfs_extlen_t, 1, minlen / mp->m_sb.sb_rextsize);
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error = xfs_rtallocate_extent(ap->tp, ap->blkno, raminlen, 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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if (rtb != NULLRTBLOCK) {
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ap->blkno = rtb * mp->m_sb.sb_rextsize;
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ap->length = ralen * mp->m_sb.sb_rextsize;
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ap->ip->i_nblocks += ap->length;
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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 -= ap->length;
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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, ap->length);
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return 0;
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}
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if (align > mp->m_sb.sb_rextsize) {
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/*
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* We previously enlarged the request length to try to satisfy
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* an extent size hint. The allocator didn't return anything,
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* so reset the parameters to the original values and try again
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* without alignment criteria.
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*/
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ap->offset = orig_offset;
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ap->length = orig_length;
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minlen = align = mp->m_sb.sb_rextsize;
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goto retry;
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}
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if (!ignore_locality && ap->blkno != 0) {
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/*
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* If we can't allocate near a specific rt extent, try again
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* without locality criteria.
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*/
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ignore_locality = true;
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goto retry;
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}
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ap->blkno = NULLFSBLOCK;
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ap->length = 0;
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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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* 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 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 = ip->i_mount;
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struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
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struct xfs_btree_cur *cur;
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xfs_extlen_t btblocks = 0;
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int error;
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*nextents = 0;
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*count = 0;
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if (!ifp)
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return 0;
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switch (ifp->if_format) {
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case XFS_DINODE_FMT_BTREE:
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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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cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
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error = xfs_btree_count_blocks(cur, &btblocks);
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xfs_btree_del_cursor(cur, error);
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if (error)
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return error;
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/*
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* xfs_btree_count_blocks includes the root block contained in
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* the inode fork in @btblocks, so subtract one because we're
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* only interested in allocated disk blocks.
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*/
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*count += btblocks - 1;
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fallthrough;
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case XFS_DINODE_FMT_EXTENTS:
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*nextents = xfs_bmap_count_leaves(ifp, count);
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break;
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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;
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int error;
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error = xfs_reflink_trim_around_shared(ip, got, &shared);
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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;
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p->bmv_block = -1;
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p->bmv_offset = XFS_FSB_TO_BB(ip->i_mount, bno);
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p->bmv_length = XFS_FSB_TO_BB(ip->i_mount, end - bno);
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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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}
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static inline bool
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xfs_getbmap_full(
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struct getbmapx *bmv)
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{
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return bmv->bmv_length == 0 || bmv->bmv_entries >= bmv->bmv_count - 1;
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}
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static bool
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xfs_getbmap_next_rec(
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struct xfs_bmbt_irec *rec,
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xfs_fileoff_t total_end)
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{
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xfs_fileoff_t end = rec->br_startoff + rec->br_blockcount;
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if (end == total_end)
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return false;
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rec->br_startoff += rec->br_blockcount;
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if (!isnullstartblock(rec->br_startblock) &&
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rec->br_startblock != DELAYSTARTBLOCK)
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rec->br_startblock += rec->br_blockcount;
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rec->br_blockcount = total_end - end;
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return true;
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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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struct xfs_inode *ip,
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struct getbmapx *bmv, /* user bmap structure */
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struct kgetbmap *out)
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{
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struct xfs_mount *mp = ip->i_mount;
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int iflags = bmv->bmv_iflags;
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int whichfork, lock, error = 0;
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int64_t bmv_end, max_len;
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xfs_fileoff_t bno, first_bno;
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struct xfs_ifork *ifp;
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struct xfs_bmbt_irec got, rec;
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xfs_filblks_t len;
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struct xfs_iext_cursor icur;
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|
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if (bmv->bmv_iflags & ~BMV_IF_VALID)
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return -EINVAL;
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#ifndef DEBUG
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/* Only allow CoW fork queries if we're debugging. */
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if (iflags & BMV_IF_COWFORK)
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return -EINVAL;
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#endif
|
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if ((iflags & BMV_IF_ATTRFORK) && (iflags & BMV_IF_COWFORK))
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return -EINVAL;
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|
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if (bmv->bmv_length < -1)
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return -EINVAL;
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bmv->bmv_entries = 0;
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if (bmv->bmv_length == 0)
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return 0;
|
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|
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if (iflags & BMV_IF_ATTRFORK)
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whichfork = XFS_ATTR_FORK;
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else if (iflags & BMV_IF_COWFORK)
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whichfork = XFS_COW_FORK;
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else
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whichfork = XFS_DATA_FORK;
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|
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xfs_ilock(ip, XFS_IOLOCK_SHARED);
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switch (whichfork) {
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case XFS_ATTR_FORK:
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lock = xfs_ilock_attr_map_shared(ip);
|
|
if (!xfs_inode_has_attr_fork(ip))
|
|
goto out_unlock_ilock;
|
|
|
|
max_len = 1LL << 32;
|
|
break;
|
|
case XFS_COW_FORK:
|
|
lock = XFS_ILOCK_SHARED;
|
|
xfs_ilock(ip, lock);
|
|
|
|
/* No CoW fork? Just return */
|
|
if (!xfs_ifork_ptr(ip, whichfork))
|
|
goto out_unlock_ilock;
|
|
|
|
if (xfs_get_cowextsz_hint(ip))
|
|
max_len = mp->m_super->s_maxbytes;
|
|
else
|
|
max_len = XFS_ISIZE(ip);
|
|
break;
|
|
case XFS_DATA_FORK:
|
|
if (!(iflags & BMV_IF_DELALLOC) &&
|
|
(ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_disk_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_diflags &
|
|
(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;
|
|
}
|
|
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
|
|
switch (ifp->if_format) {
|
|
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);
|
|
|
|
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. 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)
|
|
{
|
|
struct xfs_ifork *ifp = &ip->i_df;
|
|
xfs_fileoff_t end_fsb = start_fsb + length;
|
|
struct xfs_bmbt_irec got, del;
|
|
struct xfs_iext_cursor icur;
|
|
int error = 0;
|
|
|
|
ASSERT(!xfs_need_iread_extents(ifp));
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
if (!xfs_iext_lookup_extent_before(ip, ifp, &end_fsb, &icur, &got))
|
|
goto out_unlock;
|
|
|
|
while (got.br_startoff + got.br_blockcount > start_fsb) {
|
|
del = got;
|
|
xfs_trim_extent(&del, start_fsb, length);
|
|
|
|
/*
|
|
* A delete can push the cursor forward. Step back to the
|
|
* previous extent on non-delalloc or extents outside the
|
|
* target range.
|
|
*/
|
|
if (!del.br_blockcount ||
|
|
!isnullstartblock(del.br_startblock)) {
|
|
if (!xfs_iext_prev_extent(ifp, &icur, &got))
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
error = xfs_bmap_del_extent_delay(ip, XFS_DATA_FORK, &icur,
|
|
&got, &del);
|
|
if (error || !xfs_iext_get_extent(ifp, &icur, &got))
|
|
break;
|
|
}
|
|
|
|
out_unlock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
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)
|
|
{
|
|
struct xfs_bmbt_irec imap;
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
xfs_fileoff_t end_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
int nimaps = 1;
|
|
int error;
|
|
|
|
/*
|
|
* Caller must either hold the exclusive io lock; or be inactivating
|
|
* the inode, which guarantees there are no other users of the inode.
|
|
*/
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL) ||
|
|
(VFS_I(ip)->i_state & I_FREEING));
|
|
|
|
/* 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 (xfs_need_iread_extents(&ip->i_df))
|
|
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_diflags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND))
|
|
if (!force || ip->i_delayed_blks == 0)
|
|
return false;
|
|
|
|
/*
|
|
* Do not try to free post-EOF blocks if EOF is beyond the end of the
|
|
* range supported by the page cache, because the truncation will loop
|
|
* forever.
|
|
*/
|
|
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
|
|
if (XFS_IS_REALTIME_INODE(ip) && mp->m_sb.sb_rextsize > 1)
|
|
end_fsb = roundup_64(end_fsb, mp->m_sb.sb_rextsize);
|
|
last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
|
|
if (last_fsb <= end_fsb)
|
|
return false;
|
|
|
|
/*
|
|
* Look up the mapping for the first block past EOF. If we can't find
|
|
* it, there's nothing to free.
|
|
*/
|
|
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
error = xfs_bmapi_read(ip, end_fsb, last_fsb - end_fsb, &imap, &nimaps,
|
|
0);
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
if (error || nimaps == 0)
|
|
return false;
|
|
|
|
/*
|
|
* If there's a real mapping there or there are delayed allocation
|
|
* reservations, then we have post-EOF blocks to try to free.
|
|
*/
|
|
return imap.br_startblock != HOLESTARTBLOCK || ip->i_delayed_blks;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int error;
|
|
|
|
/* 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_is_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)
|
|
goto err_cancel;
|
|
|
|
error = xfs_trans_commit(tp);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
xfs_inode_clear_eofblocks_tag(ip);
|
|
goto out_unlock;
|
|
|
|
err_cancel:
|
|
/*
|
|
* If we get an error at this point we simply don't
|
|
* bother truncating the file.
|
|
*/
|
|
xfs_trans_cancel(tp);
|
|
out_unlock:
|
|
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)
|
|
{
|
|
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_fileoff_t endoffset_fsb;
|
|
int nimaps;
|
|
int rt;
|
|
xfs_trans_t *tp;
|
|
xfs_bmbt_irec_t imaps[1], *imapp;
|
|
int error;
|
|
|
|
trace_xfs_alloc_file_space(ip);
|
|
|
|
if (xfs_is_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);
|
|
endoffset_fsb = XFS_B_TO_FSB(mp, offset + count);
|
|
allocatesize_fsb = endoffset_fsb - startoffset_fsb;
|
|
|
|
/*
|
|
* Allocate file space until done or until there is an error
|
|
*/
|
|
while (allocatesize_fsb && !error) {
|
|
xfs_fileoff_t s, e;
|
|
unsigned int dblocks, rblocks, resblks;
|
|
|
|
/*
|
|
* 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 XFS_BMBT_MAX_EXTLEN (21 bits), so use that to enforce the
|
|
* limit.
|
|
*/
|
|
resblks = min_t(xfs_fileoff_t, (e - s),
|
|
(XFS_MAX_BMBT_EXTLEN * nimaps));
|
|
if (unlikely(rt)) {
|
|
dblocks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
|
|
rblocks = resblks;
|
|
} else {
|
|
dblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
|
|
rblocks = 0;
|
|
}
|
|
|
|
error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write,
|
|
dblocks, rblocks, false, &tp);
|
|
if (error)
|
|
break;
|
|
|
|
error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
|
|
XFS_IEXT_ADD_NOSPLIT_CNT);
|
|
if (error == -EFBIG)
|
|
error = xfs_iext_count_upgrade(tp, ip,
|
|
XFS_IEXT_ADD_NOSPLIT_CNT);
|
|
if (error)
|
|
goto error;
|
|
|
|
error = xfs_bmapi_write(tp, ip, startoffset_fsb,
|
|
allocatesize_fsb, XFS_BMAPI_PREALLOC, 0, imapp,
|
|
&nimaps);
|
|
if (error)
|
|
goto error;
|
|
|
|
ip->i_diflags |= XFS_DIFLAG_PREALLOC;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
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;
|
|
|
|
error:
|
|
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;
|
|
uint resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
|
|
int error;
|
|
|
|
error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, resblks, 0,
|
|
false, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
|
|
XFS_IEXT_PUNCH_HOLE_CNT);
|
|
if (error == -EFBIG)
|
|
error = xfs_iext_count_upgrade(tp, ip, XFS_IEXT_PUNCH_HOLE_CNT);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
error = xfs_bunmapi(tp, ip, startoffset_fsb, len_fsb, 0, 2, done);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
error = xfs_trans_commit(tp);
|
|
out_unlock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Caller must first wait for the completion of any pending DIOs if required. */
|
|
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;
|
|
|
|
rounding = max_t(xfs_off_t, mp->m_sb.sb_blocksize, 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;
|
|
|
|
startoffset_fsb = XFS_B_TO_FSB(mp, offset);
|
|
endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
|
|
|
|
/* We can only free complete realtime extents. */
|
|
if (XFS_IS_REALTIME_INODE(ip) && mp->m_sb.sb_rextsize > 1) {
|
|
startoffset_fsb = roundup_64(startoffset_fsb,
|
|
mp->m_sb.sb_rextsize);
|
|
endoffset_fsb = rounddown_64(endoffset_fsb,
|
|
mp->m_sb.sb_rextsize);
|
|
}
|
|
|
|
/*
|
|
* Need to zero the stuff we're not freeing, on disk.
|
|
*/
|
|
if (endoffset_fsb > startoffset_fsb) {
|
|
while (!done) {
|
|
error = xfs_unmap_extent(ip, startoffset_fsb,
|
|
endoffset_fsb - startoffset_fsb, &done);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now that we've unmap all full blocks we'll have to zero out any
|
|
* partial block at the beginning and/or end. xfs_zero_range is smart
|
|
* enough to skip any holes, including those we just created, but we
|
|
* must take care not to zero beyond EOF and enlarge i_size.
|
|
*/
|
|
if (offset >= XFS_ISIZE(ip))
|
|
return 0;
|
|
if (offset + len > XFS_ISIZE(ip))
|
|
len = XFS_ISIZE(ip) - offset;
|
|
error = xfs_zero_range(ip, offset, len, NULL);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* If we zeroed right up to EOF and EOF straddles a page boundary we
|
|
* must make sure that the post-EOF area is also zeroed because the
|
|
* page could be mmap'd and xfs_zero_range doesn't do that for us.
|
|
* Writeback of the eof page will do this, albeit clumsily.
|
|
*/
|
|
if (offset + len >= XFS_ISIZE(ip) && offset_in_page(offset + len) > 0) {
|
|
error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
|
|
round_down(offset + len, PAGE_SIZE), LLONG_MAX);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
xfs_prepare_shift(
|
|
struct xfs_inode *ip,
|
|
loff_t offset)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Shift operations must stabilize the start block offset boundary along
|
|
* with the full range of the operation. If we don't, a COW writeback
|
|
* completion could race with an insert, front merge with the start
|
|
* extent (after split) during the shift and corrupt the file. Start
|
|
* with the block just prior to the start to stabilize the boundary.
|
|
*/
|
|
offset = round_down(offset, mp->m_sb.sb_blocksize);
|
|
if (offset)
|
|
offset -= mp->m_sb.sb_blocksize;
|
|
|
|
/*
|
|
* Writeback and invalidate cache for the remainder of the file as we're
|
|
* about to shift down every extent from offset to EOF.
|
|
*/
|
|
error = xfs_flush_unmap_range(ip, offset, XFS_ISIZE(ip));
|
|
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_inode_has_cow_data(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;
|
|
xfs_fileoff_t next_fsb = XFS_B_TO_FSB(mp, offset + len);
|
|
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_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;
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
while (!done) {
|
|
error = xfs_bmap_collapse_extents(tp, ip, &next_fsb, shift_fsb,
|
|
&done);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
if (done)
|
|
break;
|
|
|
|
/* finish any deferred frees and roll the transaction */
|
|
error = xfs_defer_finish(&tp);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
error = xfs_trans_commit(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
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;
|
|
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_bmap_can_insert_extents(ip, stop_fsb, shift_fsb);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_prepare_shift(ip, offset);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write,
|
|
XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
|
|
XFS_IEXT_PUNCH_HOLE_CNT);
|
|
if (error == -EFBIG)
|
|
error = xfs_iext_count_upgrade(tp, ip, XFS_IEXT_PUNCH_HOLE_CNT);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
/*
|
|
* 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(tp, ip, stop_fsb);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
do {
|
|
error = xfs_defer_finish(&tp);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
error = xfs_bmap_insert_extents(tp, ip, &next_fsb, shift_fsb,
|
|
&done, stop_fsb);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
} while (!done);
|
|
|
|
error = xfs_trans_commit(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
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 */
|
|
{
|
|
struct xfs_ifork *ifp = &ip->i_df;
|
|
struct xfs_ifork *tifp = &tip->i_df;
|
|
|
|
/* User/group/project quota ids must match if quotas are enforced. */
|
|
if (XFS_IS_QUOTA_ON(ip->i_mount) &&
|
|
(!uid_eq(VFS_I(ip)->i_uid, VFS_I(tip)->i_uid) ||
|
|
!gid_eq(VFS_I(ip)->i_gid, VFS_I(tip)->i_gid) ||
|
|
ip->i_projid != tip->i_projid))
|
|
return -EINVAL;
|
|
|
|
/* Should never get a local format */
|
|
if (ifp->if_format == XFS_DINODE_FMT_LOCAL ||
|
|
tifp->if_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 (ifp->if_nextents < tifp->if_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_has_rmapbt(ip->i_mount))
|
|
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 (ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
|
|
tifp->if_format == XFS_DINODE_FMT_BTREE)
|
|
return -EINVAL;
|
|
|
|
/* Check temp in extent form to max in target */
|
|
if (tifp->if_format == XFS_DINODE_FMT_EXTENTS &&
|
|
tifp->if_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
|
|
return -EINVAL;
|
|
|
|
/* Check target in extent form to max in temp */
|
|
if (ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
|
|
ifp->if_nextents > 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 (tifp->if_format == XFS_DINODE_FMT_BTREE) {
|
|
if (xfs_inode_has_attr_fork(ip) &&
|
|
XFS_BMAP_BMDR_SPACE(tifp->if_broot) > xfs_inode_fork_boff(ip))
|
|
return -EINVAL;
|
|
if (tifp->if_nextents <= XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Reciprocal target->temp btree format checks */
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
|
|
if (xfs_inode_has_attr_fork(tip) &&
|
|
XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > xfs_inode_fork_boff(tip))
|
|
return -EINVAL;
|
|
if (ifp->if_nextents <= 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_trans *tp = *tpp;
|
|
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;
|
|
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_diflags2;
|
|
if (ip->i_diflags2 & XFS_DIFLAG2_REFLINK)
|
|
tip->i_diflags2 |= 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) {
|
|
ASSERT(tp->t_firstblock == NULLFSBLOCK);
|
|
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;
|
|
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);
|
|
|
|
if (xfs_bmap_is_real_extent(&uirec)) {
|
|
error = xfs_iext_count_may_overflow(ip,
|
|
XFS_DATA_FORK,
|
|
XFS_IEXT_SWAP_RMAP_CNT);
|
|
if (error == -EFBIG)
|
|
error = xfs_iext_count_upgrade(tp, ip,
|
|
XFS_IEXT_SWAP_RMAP_CNT);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
if (xfs_bmap_is_real_extent(&irec)) {
|
|
error = xfs_iext_count_may_overflow(tip,
|
|
XFS_DATA_FORK,
|
|
XFS_IEXT_SWAP_RMAP_CNT);
|
|
if (error == -EFBIG)
|
|
error = xfs_iext_count_upgrade(tp, ip,
|
|
XFS_IEXT_SWAP_RMAP_CNT);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
/* Remove the mapping from the donor file. */
|
|
xfs_bmap_unmap_extent(tp, tip, &uirec);
|
|
|
|
/* Remove the mapping from the source file. */
|
|
xfs_bmap_unmap_extent(tp, ip, &irec);
|
|
|
|
/* Map the donor file's blocks into the source file. */
|
|
xfs_bmap_map_extent(tp, ip, &uirec);
|
|
|
|
/* Map the source file's blocks into the donor file. */
|
|
xfs_bmap_map_extent(tp, tip, &irec);
|
|
|
|
error = xfs_defer_finish(tpp);
|
|
tp = *tpp;
|
|
if (error)
|
|
goto out;
|
|
|
|
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_diflags2 = tip_flags2;
|
|
return 0;
|
|
|
|
out:
|
|
trace_xfs_swap_extent_rmap_error(ip, error, _RET_IP_);
|
|
tip->i_diflags2 = 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)
|
|
{
|
|
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_inode_has_attr_fork(ip) && ip->i_af.if_nextents > 0 &&
|
|
ip->i_af.if_format != XFS_DINODE_FMT_LOCAL) {
|
|
error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &junk,
|
|
&aforkblks);
|
|
if (error)
|
|
return error;
|
|
}
|
|
if (xfs_inode_has_attr_fork(tip) && tip->i_af.if_nextents > 0 &&
|
|
tip->i_af.if_format != 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 (xfs_has_v3inodes(ip->i_mount)) {
|
|
if (ip->i_df.if_format == XFS_DINODE_FMT_BTREE)
|
|
(*target_log_flags) |= XFS_ILOG_DOWNER;
|
|
if (tip->i_df.if_format == XFS_DINODE_FMT_BTREE)
|
|
(*src_log_flags) |= XFS_ILOG_DOWNER;
|
|
}
|
|
|
|
/*
|
|
* Swap the data forks of the inodes
|
|
*/
|
|
swap(ip->i_df, tip->i_df);
|
|
|
|
/*
|
|
* Fix the on-disk inode values
|
|
*/
|
|
tmp = (uint64_t)ip->i_nblocks;
|
|
ip->i_nblocks = tip->i_nblocks - taforkblks + aforkblks;
|
|
tip->i_nblocks = tmp + taforkblks - aforkblks;
|
|
|
|
/*
|
|
* 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_df.if_format) {
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
(*src_log_flags) |= XFS_ILOG_DEXT;
|
|
break;
|
|
case XFS_DINODE_FMT_BTREE:
|
|
ASSERT(!xfs_has_v3inodes(ip->i_mount) ||
|
|
(*src_log_flags & XFS_ILOG_DOWNER));
|
|
(*src_log_flags) |= XFS_ILOG_DBROOT;
|
|
break;
|
|
}
|
|
|
|
switch (tip->i_df.if_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(!xfs_has_v3inodes(ip->i_mount) ||
|
|
(*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;
|
|
uint64_t f;
|
|
int resblks = 0;
|
|
unsigned int flags = 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));
|
|
filemap_invalidate_lock_two(VFS_I(ip)->i_mapping,
|
|
VFS_I(tip)->i_mapping);
|
|
|
|
/* 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_qm_dqattach(ip);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
error = xfs_qm_dqattach(tip);
|
|
if (error)
|
|
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;
|
|
|
|
if (xfs_inode_has_cow_data(tip)) {
|
|
error = xfs_reflink_cancel_cow_range(tip, 0, NULLFILEOFF, true);
|
|
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_has_rmapbt(mp)) {
|
|
int w = XFS_DATA_FORK;
|
|
uint32_t ipnext = ip->i_df.if_nextents;
|
|
uint32_t tipnext = tip->i_df.if_nextents;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* If either inode straddles a bmapbt block allocation boundary,
|
|
* the rmapbt algorithm triggers repeated allocs and frees as
|
|
* extents are remapped. This can exhaust the block reservation
|
|
* prematurely and cause shutdown. Return freed blocks to the
|
|
* transaction reservation to counter this behavior.
|
|
*/
|
|
flags |= XFS_TRANS_RES_FDBLKS;
|
|
}
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, flags,
|
|
&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);
|
|
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_disk_size ||
|
|
sxp->sx_length != tip->i_disk_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_has_rmapbt(mp))
|
|
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_diflags2 & XFS_DIFLAG2_REFLINK) ^
|
|
(tip->i_diflags2 & XFS_DIFLAG2_REFLINK)) {
|
|
f = ip->i_diflags2 & XFS_DIFLAG2_REFLINK;
|
|
ip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
|
|
ip->i_diflags2 |= tip->i_diflags2 & XFS_DIFLAG2_REFLINK;
|
|
tip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
|
|
tip->i_diflags2 |= f & XFS_DIFLAG2_REFLINK;
|
|
}
|
|
|
|
/* Swap the cow forks. */
|
|
if (xfs_has_reflink(mp)) {
|
|
ASSERT(!ip->i_cowfp ||
|
|
ip->i_cowfp->if_format == XFS_DINODE_FMT_EXTENTS);
|
|
ASSERT(!tip->i_cowfp ||
|
|
tip->i_cowfp->if_format == XFS_DINODE_FMT_EXTENTS);
|
|
|
|
swap(ip->i_cowfp, tip->i_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 (xfs_has_wsync(mp))
|
|
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_ilock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
xfs_iunlock(tip, XFS_ILOCK_EXCL);
|
|
out_unlock:
|
|
filemap_invalidate_unlock_two(VFS_I(ip)->i_mapping,
|
|
VFS_I(tip)->i_mapping);
|
|
unlock_two_nondirectories(VFS_I(ip), VFS_I(tip));
|
|
return error;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
goto out_unlock_ilock;
|
|
}
|