// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2006 Silicon Graphics, Inc. * Copyright (c) 2012 Red Hat, Inc. * All Rights Reserved. */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_shared.h" #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_bit.h" #include "xfs_mount.h" #include "xfs_defer.h" #include "xfs_inode.h" #include "xfs_btree.h" #include "xfs_trans.h" #include "xfs_alloc.h" #include "xfs_bmap.h" #include "xfs_bmap_util.h" #include "xfs_bmap_btree.h" #include "xfs_rtalloc.h" #include "xfs_error.h" #include "xfs_quota.h" #include "xfs_trans_space.h" #include "xfs_trace.h" #include "xfs_icache.h" #include "xfs_iomap.h" #include "xfs_reflink.h" #include "xfs_rtbitmap.h" #include "xfs_rtgroup.h" #include "xfs_zone_alloc.h" /* Kernel only BMAP related definitions and functions */ /* * Convert the given file system block to a disk block. We have to treat it * differently based on whether the file is a real time file or not, because the * bmap code does. */ xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb) { if (XFS_IS_REALTIME_INODE(ip)) return xfs_rtb_to_daddr(ip->i_mount, fsb); return XFS_FSB_TO_DADDR(ip->i_mount, fsb); } /* * Routine to zero an extent on disk allocated to the specific inode. */ int xfs_zero_extent( struct xfs_inode *ip, xfs_fsblock_t start_fsb, xfs_off_t count_fsb) { return blkdev_issue_zeroout(xfs_inode_buftarg(ip)->bt_bdev, xfs_fsb_to_db(ip, start_fsb), XFS_FSB_TO_BB(ip->i_mount, count_fsb), GFP_KERNEL, 0); } /* * Extent tree block counting routines. */ /* * Count leaf blocks given a range of extent records. Delayed allocation * extents are not counted towards the totals. */ xfs_extnum_t xfs_bmap_count_leaves( struct xfs_ifork *ifp, xfs_filblks_t *count) { struct xfs_iext_cursor icur; struct xfs_bmbt_irec got; xfs_extnum_t numrecs = 0; for_each_xfs_iext(ifp, &icur, &got) { if (!isnullstartblock(got.br_startblock)) { *count += got.br_blockcount; numrecs++; } } return numrecs; } /* * Count fsblocks of the given fork. Delayed allocation extents are * not counted towards the totals. */ int xfs_bmap_count_blocks( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, xfs_extnum_t *nextents, xfs_filblks_t *count) { struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_btree_cur *cur; xfs_filblks_t btblocks = 0; int error; *nextents = 0; *count = 0; if (!ifp) return 0; switch (ifp->if_format) { case XFS_DINODE_FMT_BTREE: error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); error = xfs_btree_count_blocks(cur, &btblocks); xfs_btree_del_cursor(cur, error); if (error) return error; /* * xfs_btree_count_blocks includes the root block contained in * the inode fork in @btblocks, so subtract one because we're * only interested in allocated disk blocks. */ *count += btblocks - 1; fallthrough; case XFS_DINODE_FMT_EXTENTS: *nextents = xfs_bmap_count_leaves(ifp, count); break; } return 0; } static int xfs_getbmap_report_one( struct xfs_inode *ip, struct getbmapx *bmv, struct kgetbmap *out, int64_t bmv_end, struct xfs_bmbt_irec *got) { struct kgetbmap *p = out + bmv->bmv_entries; bool shared = false; int error; error = xfs_reflink_trim_around_shared(ip, got, &shared); if (error) return error; if (isnullstartblock(got->br_startblock) || got->br_startblock == DELAYSTARTBLOCK) { /* * Take the flush completion as being a point-in-time snapshot * where there are no delalloc extents, and if any new ones * have been created racily, just skip them as being 'after' * the flush and so don't get reported. */ if (!(bmv->bmv_iflags & BMV_IF_DELALLOC)) return 0; p->bmv_oflags |= BMV_OF_DELALLOC; p->bmv_block = -2; } else { p->bmv_block = xfs_fsb_to_db(ip, got->br_startblock); } if (got->br_state == XFS_EXT_UNWRITTEN && (bmv->bmv_iflags & BMV_IF_PREALLOC)) p->bmv_oflags |= BMV_OF_PREALLOC; if (shared) p->bmv_oflags |= BMV_OF_SHARED; p->bmv_offset = XFS_FSB_TO_BB(ip->i_mount, got->br_startoff); p->bmv_length = XFS_FSB_TO_BB(ip->i_mount, got->br_blockcount); bmv->bmv_offset = p->bmv_offset + p->bmv_length; bmv->bmv_length = max(0LL, bmv_end - bmv->bmv_offset); bmv->bmv_entries++; return 0; } static void xfs_getbmap_report_hole( struct xfs_inode *ip, struct getbmapx *bmv, struct kgetbmap *out, int64_t bmv_end, xfs_fileoff_t bno, xfs_fileoff_t end) { struct kgetbmap *p = out + bmv->bmv_entries; if (bmv->bmv_iflags & BMV_IF_NO_HOLES) return; p->bmv_block = -1; p->bmv_offset = XFS_FSB_TO_BB(ip->i_mount, bno); p->bmv_length = XFS_FSB_TO_BB(ip->i_mount, end - bno); bmv->bmv_offset = p->bmv_offset + p->bmv_length; bmv->bmv_length = max(0LL, bmv_end - bmv->bmv_offset); bmv->bmv_entries++; } static inline bool xfs_getbmap_full( struct getbmapx *bmv) { return bmv->bmv_length == 0 || bmv->bmv_entries >= bmv->bmv_count - 1; } static bool xfs_getbmap_next_rec( struct xfs_bmbt_irec *rec, xfs_fileoff_t total_end) { xfs_fileoff_t end = rec->br_startoff + rec->br_blockcount; if (end == total_end) return false; rec->br_startoff += rec->br_blockcount; if (!isnullstartblock(rec->br_startblock) && rec->br_startblock != DELAYSTARTBLOCK) rec->br_startblock += rec->br_blockcount; rec->br_blockcount = total_end - end; return true; } /* * Get inode's extents as described in bmv, and format for output. * Calls formatter to fill the user's buffer until all extents * are mapped, until the passed-in bmv->bmv_count slots have * been filled, or until the formatter short-circuits the loop, * if it is tracking filled-in extents on its own. */ int /* error code */ xfs_getbmap( struct xfs_inode *ip, struct getbmapx *bmv, /* user bmap structure */ struct kgetbmap *out) { struct xfs_mount *mp = ip->i_mount; int iflags = bmv->bmv_iflags; int whichfork, lock, error = 0; int64_t bmv_end, max_len; xfs_fileoff_t bno, first_bno; struct xfs_ifork *ifp; struct xfs_bmbt_irec got, rec; xfs_filblks_t len; struct xfs_iext_cursor icur; if (bmv->bmv_iflags & ~BMV_IF_VALID) return -EINVAL; #ifndef DEBUG /* Only allow CoW fork queries if we're debugging. */ if (iflags & BMV_IF_COWFORK) return -EINVAL; #endif if ((iflags & BMV_IF_ATTRFORK) && (iflags & BMV_IF_COWFORK)) return -EINVAL; if (bmv->bmv_length < -1) return -EINVAL; bmv->bmv_entries = 0; if (bmv->bmv_length == 0) return 0; if (iflags & BMV_IF_ATTRFORK) whichfork = XFS_ATTR_FORK; else if (iflags & BMV_IF_COWFORK) whichfork = XFS_COW_FORK; else whichfork = XFS_DATA_FORK; xfs_ilock(ip, XFS_IOLOCK_SHARED); switch (whichfork) { case XFS_ATTR_FORK: 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)) 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)); if (bmv->bmv_entries > 0) 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. */ void xfs_bmap_punch_delalloc_range( struct xfs_inode *ip, int whichfork, xfs_off_t start_byte, xfs_off_t end_byte, struct xfs_zone_alloc_ctx *ac) { struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); xfs_fileoff_t start_fsb = XFS_B_TO_FSBT(mp, start_byte); xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, end_byte); struct xfs_bmbt_irec got, del; struct xfs_iext_cursor icur; 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, end_fsb - start_fsb); /* * 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; } if (xfs_is_zoned_inode(ip) && ac) { /* * In a zoned buffered write context we need to return * the punched delalloc allocations to the allocation * context. This allows reusing them in the following * iomap iterations. */ xfs_bmap_del_extent_delay(ip, whichfork, &icur, &got, &del, XFS_BMAPI_REMAP); ac->reserved_blocks += del.br_blockcount; } else { xfs_bmap_del_extent_delay(ip, whichfork, &icur, &got, &del, 0); } if (!xfs_iext_get_extent(ifp, &icur, &got)) break; } if (whichfork == XFS_COW_FORK && !ifp->if_bytes) xfs_inode_clear_cowblocks_tag(ip); out_unlock: xfs_iunlock(ip, XFS_ILOCK_EXCL); } /* * Test whether it is appropriate to check an inode for and free post EOF * blocks. */ bool xfs_can_free_eofblocks( struct xfs_inode *ip) { struct xfs_mount *mp = ip->i_mount; bool found_blocks = false; xfs_fileoff_t end_fsb; xfs_fileoff_t last_fsb; struct xfs_bmbt_irec imap; struct xfs_iext_cursor icur; /* * Caller must either hold the exclusive io lock; or be inactivating * the inode, which guarantees there are no other users of the inode. */ if (!(VFS_I(ip)->i_state & I_FREEING)) xfs_assert_ilocked(ip, XFS_IOLOCK_EXCL); /* 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 extents in preallocated files unless the file has * delalloc blocks and we are forced to remove them. */ if ((ip->i_diflags & XFS_DIFLAG_PREALLOC) && !ip->i_delayed_blks) 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_inode_has_bigrtalloc(ip)) end_fsb = xfs_fileoff_roundup_rtx(mp, end_fsb); last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); if (last_fsb <= end_fsb) return false; /* * Check if there is an post-EOF extent to free. If there are any * delalloc blocks attached to the inode (data fork delalloc * reservations or CoW extents of any kind), we need to free them so * that inactivation doesn't fail to erase them. */ xfs_ilock(ip, XFS_ILOCK_SHARED); if (ip->i_delayed_blks || xfs_iext_lookup_extent(ip, &ip->i_df, end_fsb, &icur, &imap)) found_blocks = true; xfs_iunlock(ip, XFS_ILOCK_SHARED); return found_blocks; } /* * 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)); /* * For preallocated files only free delayed allocations. * * Note that this means we also leave speculative preallocations in * place for preallocated files. */ if (ip->i_diflags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) { if (ip->i_delayed_blks) { xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK, round_up(XFS_ISIZE(ip), mp->m_sb.sb_blocksize), LLONG_MAX, NULL); } xfs_inode_clear_eofblocks_tag(ip); return 0; } 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 allocatesize_fsb; xfs_extlen_t extsz, temp; xfs_fileoff_t startoffset_fsb; xfs_fileoff_t endoffset_fsb; int rt; xfs_trans_t *tp; xfs_bmbt_irec_t imaps[1], *imapp; int error; if (xfs_is_always_cow_inode(ip)) return 0; 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]; 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; int nimaps = 1; /* * 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_extend(tp, ip, XFS_DATA_FORK, XFS_IEXT_ADD_NOSPLIT_CNT); if (error) goto error; /* * If the allocator cannot find a single free extent large * enough to cover the start block of the requested range, * xfs_bmapi_write will return -ENOSR. * * In that case we simply need to keep looping with the same * startoffset_fsb so that one of the following allocations * will eventually reach the requested range. */ error = xfs_bmapi_write(tp, ip, startoffset_fsb, allocatesize_fsb, XFS_BMAPI_PREALLOC, 0, imapp, &nimaps); if (error) { if (error != -ENOSR) goto error; error = 0; } else { startoffset_fsb += imapp->br_blockcount; allocatesize_fsb -= imapp->br_blockcount; } 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); } 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_extend(tp, ip, XFS_DATA_FORK, 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 inode *inode = VFS_I(ip); xfs_off_t rounding, start, end; int error; /* * Make sure we extend the flush out to extent alignment * boundaries so any extent range overlapping the start/end * of the modification we are about to do is clean and idle. */ rounding = max_t(xfs_off_t, xfs_inode_alloc_unitsize(ip), PAGE_SIZE); start = rounddown_64(offset, rounding); end = roundup_64(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_zone_alloc_ctx *ac) { 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; /* * Now AIO and DIO has drained we flush and (if necessary) invalidate * the cached range over the first operation we are about to run. */ 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); /* We can only free complete realtime extents. */ if (xfs_inode_has_bigrtalloc(ip)) { startoffset_fsb = xfs_fileoff_roundup_rtx(mp, startoffset_fsb); endoffset_fsb = xfs_fileoff_rounddown_rtx(mp, endoffset_fsb); } /* * 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, ac, 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) { unsigned int rounding; int error; /* * Trim eofblocks to avoid shifting uninitialized post-eof preallocation * into the accessible region of the file. */ if (xfs_can_free_eofblocks(ip)) { 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 allocation unit just prior to the start to stabilize the * boundary. */ rounding = xfs_inode_alloc_unitsize(ip); offset = rounddown_64(offset, rounding); if (offset) offset -= rounding; /* * 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_zone_alloc_ctx *ac) { 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; xfs_assert_ilocked(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL); trace_xfs_collapse_file_space(ip); error = xfs_free_file_space(ip, offset, len, ac); 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; xfs_assert_ilocked(ip, XFS_IOLOCK_EXCL | 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_extend(tp, ip, XFS_DATA_FORK, 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_highest_agno == NULLAGNUMBER); 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_extend(tp, ip, XFS_DATA_FORK, XFS_IEXT_SWAP_RMAP_CNT); if (error) goto out; } if (xfs_bmap_is_real_extent(&irec)) { error = xfs_iext_count_extend(tp, tip, XFS_DATA_FORK, XFS_IEXT_SWAP_RMAP_CNT); if (error) goto out; } /* Remove the mapping from the donor file. */ xfs_bmap_unmap_extent(tp, tip, XFS_DATA_FORK, &uirec); /* Remove the mapping from the source file. */ xfs_bmap_unmap_extent(tp, ip, XFS_DATA_FORK, &irec); /* Map the donor file's blocks into the source file. */ xfs_bmap_map_extent(tp, ip, XFS_DATA_FORK, &uirec); /* Map the source file's blocks into the donor file. */ xfs_bmap_map_extent(tp, tip, XFS_DATA_FORK, &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; struct timespec64 ctime, mtime; /* * 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; } /* * The rmapbt implementation is unable to resume a swapext operation * after a crash if the allocation unit size is larger than a block. * This (deprecated) interface will not be upgraded to handle this * situation. Defragmentation must be performed with the commit range * ioctl. */ if (XFS_IS_REALTIME_INODE(ip) && xfs_has_rtgroups(ip->i_mount)) { error = -EOPNOTSUPP; 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. */ ctime = inode_get_ctime(VFS_I(ip)); mtime = inode_get_mtime(VFS_I(ip)); if ((sbp->bs_ctime.tv_sec != ctime.tv_sec) || (sbp->bs_ctime.tv_nsec != ctime.tv_nsec) || (sbp->bs_mtime.tv_sec != mtime.tv_sec) || (sbp->bs_mtime.tv_nsec != 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; }