928 lines
25 KiB
C
Executable File
928 lines
25 KiB
C
Executable File
/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_error.h"
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#include "xfs_trans.h"
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#include "xfs_trans_space.h"
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#include "xfs_iomap.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_quota.h"
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#include "xfs_dquot_item.h"
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#include "xfs_dquot.h"
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#include "xfs_dinode.h"
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#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
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<< mp->m_writeio_log)
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#define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
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STATIC int
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xfs_iomap_eof_align_last_fsb(
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xfs_mount_t *mp,
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xfs_inode_t *ip,
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xfs_extlen_t extsize,
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xfs_fileoff_t *last_fsb)
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{
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xfs_fileoff_t new_last_fsb = 0;
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xfs_extlen_t align = 0;
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int eof, error;
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if (!XFS_IS_REALTIME_INODE(ip)) {
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/*
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* Round up the allocation request to a stripe unit
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* (m_dalign) boundary if the file size is >= stripe unit
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* size, and we are allocating past the allocation eof.
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*
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* If mounted with the "-o swalloc" option the alignment is
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* increased from the strip unit size to the stripe width.
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*/
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if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
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align = mp->m_swidth;
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else if (mp->m_dalign)
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align = mp->m_dalign;
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if (align && XFS_ISIZE(ip) >= XFS_FSB_TO_B(mp, align))
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new_last_fsb = roundup_64(*last_fsb, align);
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}
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/*
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* Always round up the allocation request to an extent boundary
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* (when file on a real-time subvolume or has di_extsize hint).
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*/
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if (extsize) {
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if (new_last_fsb)
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align = roundup_64(new_last_fsb, extsize);
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else
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align = extsize;
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new_last_fsb = roundup_64(*last_fsb, align);
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}
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if (new_last_fsb) {
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error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
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if (error)
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return error;
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if (eof)
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*last_fsb = new_last_fsb;
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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_alert_fsblock_zero(
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xfs_inode_t *ip,
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xfs_bmbt_irec_t *imap)
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{
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xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
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"Access to block zero in inode %llu "
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"start_block: %llx start_off: %llx "
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"blkcnt: %llx extent-state: %x",
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(unsigned long long)ip->i_ino,
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(unsigned long long)imap->br_startblock,
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(unsigned long long)imap->br_startoff,
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(unsigned long long)imap->br_blockcount,
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imap->br_state);
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return -EFSCORRUPTED;
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}
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int
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xfs_iomap_write_direct(
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xfs_inode_t *ip,
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xfs_off_t offset,
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size_t count,
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xfs_bmbt_irec_t *imap,
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int nmaps)
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{
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xfs_mount_t *mp = ip->i_mount;
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xfs_fileoff_t offset_fsb;
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xfs_fileoff_t last_fsb;
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xfs_filblks_t count_fsb, resaligned;
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xfs_fsblock_t firstfsb;
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xfs_extlen_t extsz, temp;
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int nimaps;
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int quota_flag;
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int rt;
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xfs_trans_t *tp;
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xfs_bmap_free_t free_list;
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uint qblocks, resblks, resrtextents;
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int committed;
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int error;
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error = xfs_qm_dqattach(ip, 0);
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if (error)
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return error;
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rt = XFS_IS_REALTIME_INODE(ip);
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extsz = xfs_get_extsz_hint(ip);
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offset_fsb = XFS_B_TO_FSBT(mp, offset);
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last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
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if ((offset + count) > XFS_ISIZE(ip)) {
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error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
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if (error)
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return error;
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} else {
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if (nmaps && (imap->br_startblock == HOLESTARTBLOCK))
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last_fsb = MIN(last_fsb, (xfs_fileoff_t)
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imap->br_blockcount +
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imap->br_startoff);
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}
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count_fsb = last_fsb - offset_fsb;
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ASSERT(count_fsb > 0);
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resaligned = count_fsb;
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if (unlikely(extsz)) {
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if ((temp = do_mod(offset_fsb, extsz)))
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resaligned += temp;
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if ((temp = do_mod(resaligned, extsz)))
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resaligned += extsz - temp;
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}
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if (unlikely(rt)) {
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resrtextents = qblocks = resaligned;
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resrtextents /= mp->m_sb.sb_rextsize;
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resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
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quota_flag = XFS_QMOPT_RES_RTBLKS;
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} else {
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resrtextents = 0;
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resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
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quota_flag = XFS_QMOPT_RES_REGBLKS;
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}
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/*
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* Allocate and setup the transaction
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*/
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tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
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error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
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resblks, resrtextents);
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/*
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* Check for running out of space, note: need lock to return
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*/
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if (error) {
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xfs_trans_cancel(tp, 0);
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return error;
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}
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
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if (error)
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goto out_trans_cancel;
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xfs_trans_ijoin(tp, ip, 0);
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/*
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* From this point onwards we overwrite the imap pointer that the
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* caller gave to us.
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*/
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xfs_bmap_init(&free_list, &firstfsb);
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nimaps = 1;
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error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
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XFS_BMAPI_PREALLOC, &firstfsb, 0,
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imap, &nimaps, &free_list);
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if (error)
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goto out_bmap_cancel;
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/*
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* Complete the transaction
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*/
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error = xfs_bmap_finish(&tp, &free_list, &committed);
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if (error)
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goto out_bmap_cancel;
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error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
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if (error)
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goto out_unlock;
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/*
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* Copy any maps to caller's array and return any error.
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*/
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if (nimaps == 0) {
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error = -ENOSPC;
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goto out_unlock;
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}
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if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
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error = xfs_alert_fsblock_zero(ip, imap);
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out_unlock:
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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return error;
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out_bmap_cancel:
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xfs_bmap_cancel(&free_list);
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xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
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out_trans_cancel:
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xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
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goto out_unlock;
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}
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/*
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* If the caller is doing a write at the end of the file, then extend the
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* allocation out to the file system's write iosize. We clean up any extra
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* space left over when the file is closed in xfs_inactive().
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*
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* If we find we already have delalloc preallocation beyond EOF, don't do more
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* preallocation as it it not needed.
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*/
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STATIC int
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xfs_iomap_eof_want_preallocate(
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xfs_mount_t *mp,
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xfs_inode_t *ip,
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xfs_off_t offset,
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size_t count,
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xfs_bmbt_irec_t *imap,
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int nimaps,
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int *prealloc)
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{
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xfs_fileoff_t start_fsb;
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xfs_filblks_t count_fsb;
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xfs_fsblock_t firstblock;
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int n, error, imaps;
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int found_delalloc = 0;
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*prealloc = 0;
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if (offset + count <= XFS_ISIZE(ip))
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return 0;
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/*
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* If the file is smaller than the minimum prealloc and we are using
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* dynamic preallocation, don't do any preallocation at all as it is
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* likely this is the only write to the file that is going to be done.
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*/
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if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
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XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks))
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return 0;
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/*
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* If there are any real blocks past eof, then don't
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* do any speculative allocation.
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*/
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start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
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count_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
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while (count_fsb > 0) {
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imaps = nimaps;
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firstblock = NULLFSBLOCK;
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error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps,
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0);
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if (error)
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return error;
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for (n = 0; n < imaps; n++) {
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if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
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(imap[n].br_startblock != DELAYSTARTBLOCK))
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return 0;
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start_fsb += imap[n].br_blockcount;
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count_fsb -= imap[n].br_blockcount;
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if (imap[n].br_startblock == DELAYSTARTBLOCK)
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found_delalloc = 1;
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}
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}
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if (!found_delalloc)
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*prealloc = 1;
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return 0;
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}
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/*
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* Determine the initial size of the preallocation. We are beyond the current
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* EOF here, but we need to take into account whether this is a sparse write or
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* an extending write when determining the preallocation size. Hence we need to
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* look up the extent that ends at the current write offset and use the result
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* to determine the preallocation size.
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*
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* If the extent is a hole, then preallocation is essentially disabled.
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* Otherwise we take the size of the preceeding data extent as the basis for the
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* preallocation size. If the size of the extent is greater than half the
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* maximum extent length, then use the current offset as the basis. This ensures
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* that for large files the preallocation size always extends to MAXEXTLEN
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* rather than falling short due to things like stripe unit/width alignment of
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* real extents.
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*/
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STATIC xfs_fsblock_t
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xfs_iomap_eof_prealloc_initial_size(
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struct xfs_mount *mp,
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struct xfs_inode *ip,
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xfs_off_t offset,
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xfs_bmbt_irec_t *imap,
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int nimaps)
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{
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xfs_fileoff_t start_fsb;
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int imaps = 1;
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int error;
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ASSERT(nimaps >= imaps);
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/* if we are using a specific prealloc size, return now */
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if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
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return 0;
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|
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/* If the file is small, then use the minimum prealloc */
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if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign))
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return 0;
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/*
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* As we write multiple pages, the offset will always align to the
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* start of a page and hence point to a hole at EOF. i.e. if the size is
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* 4096 bytes, we only have one block at FSB 0, but XFS_B_TO_FSB(4096)
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* will return FSB 1. Hence if there are blocks in the file, we want to
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* point to the block prior to the EOF block and not the hole that maps
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* directly at @offset.
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*/
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start_fsb = XFS_B_TO_FSB(mp, offset);
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if (start_fsb)
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start_fsb--;
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error = xfs_bmapi_read(ip, start_fsb, 1, imap, &imaps, XFS_BMAPI_ENTIRE);
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if (error)
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return 0;
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|
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ASSERT(imaps == 1);
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if (imap[0].br_startblock == HOLESTARTBLOCK)
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return 0;
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if (imap[0].br_blockcount <= (MAXEXTLEN >> 1))
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return imap[0].br_blockcount << 1;
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return XFS_B_TO_FSB(mp, offset);
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}
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|
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STATIC bool
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xfs_quota_need_throttle(
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struct xfs_inode *ip,
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int type,
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xfs_fsblock_t alloc_blocks)
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{
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struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
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|
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if (!dq || !xfs_this_quota_on(ip->i_mount, type))
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return false;
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|
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/* no hi watermark, no throttle */
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if (!dq->q_prealloc_hi_wmark)
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return false;
|
|
|
|
/* under the lo watermark, no throttle */
|
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if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark)
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return false;
|
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|
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return true;
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}
|
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|
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STATIC void
|
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xfs_quota_calc_throttle(
|
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struct xfs_inode *ip,
|
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int type,
|
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xfs_fsblock_t *qblocks,
|
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int *qshift,
|
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int64_t *qfreesp)
|
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{
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int64_t freesp;
|
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int shift = 0;
|
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struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
|
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|
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/* no dq, or over hi wmark, squash the prealloc completely */
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if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) {
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*qblocks = 0;
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*qfreesp = 0;
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return;
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}
|
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|
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freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount;
|
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if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
|
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shift = 2;
|
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if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
|
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shift += 2;
|
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if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT])
|
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shift += 2;
|
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}
|
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|
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if (freesp < *qfreesp)
|
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*qfreesp = freesp;
|
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|
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/* only overwrite the throttle values if we are more aggressive */
|
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if ((freesp >> shift) < (*qblocks >> *qshift)) {
|
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*qblocks = freesp;
|
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*qshift = shift;
|
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}
|
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}
|
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|
|
/*
|
|
* If we don't have a user specified preallocation size, dynamically increase
|
|
* the preallocation size as the size of the file grows. Cap the maximum size
|
|
* at a single extent or less if the filesystem is near full. The closer the
|
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* filesystem is to full, the smaller the maximum prealocation.
|
|
*/
|
|
STATIC xfs_fsblock_t
|
|
xfs_iomap_prealloc_size(
|
|
struct xfs_mount *mp,
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
struct xfs_bmbt_irec *imap,
|
|
int nimaps)
|
|
{
|
|
xfs_fsblock_t alloc_blocks = 0;
|
|
int shift = 0;
|
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int64_t freesp;
|
|
xfs_fsblock_t qblocks;
|
|
int qshift = 0;
|
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|
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alloc_blocks = xfs_iomap_eof_prealloc_initial_size(mp, ip, offset,
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imap, nimaps);
|
|
if (!alloc_blocks)
|
|
goto check_writeio;
|
|
qblocks = alloc_blocks;
|
|
|
|
/*
|
|
* MAXEXTLEN is not a power of two value but we round the prealloc down
|
|
* to the nearest power of two value after throttling. To prevent the
|
|
* round down from unconditionally reducing the maximum supported prealloc
|
|
* size, we round up first, apply appropriate throttling, round down and
|
|
* cap the value to MAXEXTLEN.
|
|
*/
|
|
alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN),
|
|
alloc_blocks);
|
|
|
|
xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
|
|
freesp = mp->m_sb.sb_fdblocks;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
|
|
shift = 2;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
|
|
shift++;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
|
|
shift++;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
|
|
shift++;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
|
|
shift++;
|
|
}
|
|
|
|
/*
|
|
* Check each quota to cap the prealloc size, provide a shift value to
|
|
* throttle with and adjust amount of available space.
|
|
*/
|
|
if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks))
|
|
xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift,
|
|
&freesp);
|
|
if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks))
|
|
xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift,
|
|
&freesp);
|
|
if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks))
|
|
xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift,
|
|
&freesp);
|
|
|
|
/*
|
|
* The final prealloc size is set to the minimum of free space available
|
|
* in each of the quotas and the overall filesystem.
|
|
*
|
|
* The shift throttle value is set to the maximum value as determined by
|
|
* the global low free space values and per-quota low free space values.
|
|
*/
|
|
alloc_blocks = MIN(alloc_blocks, qblocks);
|
|
shift = MAX(shift, qshift);
|
|
|
|
if (shift)
|
|
alloc_blocks >>= shift;
|
|
/*
|
|
* rounddown_pow_of_two() returns an undefined result if we pass in
|
|
* alloc_blocks = 0.
|
|
*/
|
|
if (alloc_blocks)
|
|
alloc_blocks = rounddown_pow_of_two(alloc_blocks);
|
|
if (alloc_blocks > MAXEXTLEN)
|
|
alloc_blocks = MAXEXTLEN;
|
|
|
|
/*
|
|
* If we are still trying to allocate more space than is
|
|
* available, squash the prealloc hard. This can happen if we
|
|
* have a large file on a small filesystem and the above
|
|
* lowspace thresholds are smaller than MAXEXTLEN.
|
|
*/
|
|
while (alloc_blocks && alloc_blocks >= freesp)
|
|
alloc_blocks >>= 4;
|
|
|
|
check_writeio:
|
|
if (alloc_blocks < mp->m_writeio_blocks)
|
|
alloc_blocks = mp->m_writeio_blocks;
|
|
|
|
trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
|
|
mp->m_writeio_blocks);
|
|
|
|
return alloc_blocks;
|
|
}
|
|
|
|
int
|
|
xfs_iomap_write_delay(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
xfs_bmbt_irec_t *ret_imap)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
xfs_off_t aligned_offset;
|
|
xfs_fileoff_t ioalign;
|
|
xfs_extlen_t extsz;
|
|
int nimaps;
|
|
xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
|
|
int prealloc;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
/*
|
|
* Make sure that the dquots are there. This doesn't hold
|
|
* the ilock across a disk read.
|
|
*/
|
|
error = xfs_qm_dqattach_locked(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
extsz = xfs_get_extsz_hint(ip);
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
|
|
error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count,
|
|
imap, XFS_WRITE_IMAPS, &prealloc);
|
|
if (error)
|
|
return error;
|
|
|
|
retry:
|
|
if (prealloc) {
|
|
xfs_fsblock_t alloc_blocks;
|
|
|
|
alloc_blocks = xfs_iomap_prealloc_size(mp, ip, offset, imap,
|
|
XFS_WRITE_IMAPS);
|
|
|
|
aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
|
|
ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
|
|
last_fsb = ioalign + alloc_blocks;
|
|
} else {
|
|
last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
|
|
}
|
|
|
|
if (prealloc || extsz) {
|
|
error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Make sure preallocation does not create extents beyond the range we
|
|
* actually support in this filesystem.
|
|
*/
|
|
if (last_fsb > XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes))
|
|
last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
|
|
|
|
ASSERT(last_fsb > offset_fsb);
|
|
|
|
nimaps = XFS_WRITE_IMAPS;
|
|
error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb,
|
|
imap, &nimaps, XFS_BMAPI_ENTIRE);
|
|
switch (error) {
|
|
case 0:
|
|
case -ENOSPC:
|
|
case -EDQUOT:
|
|
break;
|
|
default:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* If bmapi returned us nothing, we got either ENOSPC or EDQUOT. Retry
|
|
* without EOF preallocation.
|
|
*/
|
|
if (nimaps == 0) {
|
|
trace_xfs_delalloc_enospc(ip, offset, count);
|
|
if (prealloc) {
|
|
prealloc = 0;
|
|
error = 0;
|
|
goto retry;
|
|
}
|
|
return error ? error : -ENOSPC;
|
|
}
|
|
|
|
if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_alert_fsblock_zero(ip, &imap[0]);
|
|
|
|
/*
|
|
* Tag the inode as speculatively preallocated so we can reclaim this
|
|
* space on demand, if necessary.
|
|
*/
|
|
if (prealloc)
|
|
xfs_inode_set_eofblocks_tag(ip);
|
|
|
|
*ret_imap = imap[0];
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pass in a delayed allocate extent, convert it to real extents;
|
|
* return to the caller the extent we create which maps on top of
|
|
* the originating callers request.
|
|
*
|
|
* Called without a lock on the inode.
|
|
*
|
|
* We no longer bother to look at the incoming map - all we have to
|
|
* guarantee is that whatever we allocate fills the required range.
|
|
*/
|
|
int
|
|
xfs_iomap_write_allocate(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
xfs_bmbt_irec_t *imap)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb, last_block;
|
|
xfs_fileoff_t end_fsb, map_start_fsb;
|
|
xfs_fsblock_t first_block;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_trans_t *tp;
|
|
int nimaps, committed;
|
|
int error = 0;
|
|
int nres;
|
|
|
|
/*
|
|
* Make sure that the dquots are there.
|
|
*/
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
count_fsb = imap->br_blockcount;
|
|
map_start_fsb = imap->br_startoff;
|
|
|
|
XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
|
|
|
|
while (count_fsb != 0) {
|
|
/*
|
|
* Set up a transaction with which to allocate the
|
|
* backing store for the file. Do allocations in a
|
|
* loop until we get some space in the range we are
|
|
* interested in. The other space that might be allocated
|
|
* is in the delayed allocation extent on which we sit
|
|
* but before our buffer starts.
|
|
*/
|
|
|
|
nimaps = 0;
|
|
while (nimaps == 0) {
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
|
|
tp->t_flags |= XFS_TRANS_RESERVE;
|
|
nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
|
|
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
|
|
nres, 0);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return error;
|
|
}
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
|
|
/*
|
|
* it is possible that the extents have changed since
|
|
* we did the read call as we dropped the ilock for a
|
|
* while. We have to be careful about truncates or hole
|
|
* punchs here - we are not allowed to allocate
|
|
* non-delalloc blocks here.
|
|
*
|
|
* The only protection against truncation is the pages
|
|
* for the range we are being asked to convert are
|
|
* locked and hence a truncate will block on them
|
|
* first.
|
|
*
|
|
* As a result, if we go beyond the range we really
|
|
* need and hit an delalloc extent boundary followed by
|
|
* a hole while we have excess blocks in the map, we
|
|
* will fill the hole incorrectly and overrun the
|
|
* transaction reservation.
|
|
*
|
|
* Using a single map prevents this as we are forced to
|
|
* check each map we look for overlap with the desired
|
|
* range and abort as soon as we find it. Also, given
|
|
* that we only return a single map, having one beyond
|
|
* what we can return is probably a bit silly.
|
|
*
|
|
* We also need to check that we don't go beyond EOF;
|
|
* this is a truncate optimisation as a truncate sets
|
|
* the new file size before block on the pages we
|
|
* currently have locked under writeback. Because they
|
|
* are about to be tossed, we don't need to write them
|
|
* back....
|
|
*/
|
|
nimaps = 1;
|
|
end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
|
|
error = xfs_bmap_last_offset(ip, &last_block,
|
|
XFS_DATA_FORK);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
|
|
if ((map_start_fsb + count_fsb) > last_block) {
|
|
count_fsb = last_block - map_start_fsb;
|
|
if (count_fsb == 0) {
|
|
error = -EAGAIN;
|
|
goto trans_cancel;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* From this point onwards we overwrite the imap
|
|
* pointer that the caller gave to us.
|
|
*/
|
|
error = xfs_bmapi_write(tp, ip, map_start_fsb,
|
|
count_fsb, 0,
|
|
&first_block, 1,
|
|
imap, &nimaps, &free_list);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto error0;
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
/*
|
|
* See if we were able to allocate an extent that
|
|
* covers at least part of the callers request
|
|
*/
|
|
if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_alert_fsblock_zero(ip, imap);
|
|
|
|
if ((offset_fsb >= imap->br_startoff) &&
|
|
(offset_fsb < (imap->br_startoff +
|
|
imap->br_blockcount))) {
|
|
XFS_STATS_INC(xs_xstrat_quick);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* So far we have not mapped the requested part of the
|
|
* file, just surrounding data, try again.
|
|
*/
|
|
count_fsb -= imap->br_blockcount;
|
|
map_start_fsb = imap->br_startoff + imap->br_blockcount;
|
|
}
|
|
|
|
trans_cancel:
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
error0:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_iomap_write_unwritten(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_filblks_t numblks_fsb;
|
|
xfs_fsblock_t firstfsb;
|
|
int nimaps;
|
|
xfs_trans_t *tp;
|
|
xfs_bmbt_irec_t imap;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_fsize_t i_size;
|
|
uint resblks;
|
|
int committed;
|
|
int error;
|
|
|
|
trace_xfs_unwritten_convert(ip, offset, count);
|
|
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
|
|
count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
|
|
|
|
/*
|
|
* Reserve enough blocks in this transaction for two complete extent
|
|
* btree splits. We may be converting the middle part of an unwritten
|
|
* extent and in this case we will insert two new extents in the btree
|
|
* each of which could cause a full split.
|
|
*
|
|
* This reservation amount will be used in the first call to
|
|
* xfs_bmbt_split() to select an AG with enough space to satisfy the
|
|
* rest of the operation.
|
|
*/
|
|
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
|
|
|
|
do {
|
|
/*
|
|
* set up a transaction to convert the range of extents
|
|
* from unwritten to real. Do allocations in a loop until
|
|
* we have covered the range passed in.
|
|
*
|
|
* Note that we open code the transaction allocation here
|
|
* to pass KM_NOFS--we can't risk to recursing back into
|
|
* the filesystem here as we might be asked to write out
|
|
* the same inode that we complete here and might deadlock
|
|
* on the iolock.
|
|
*/
|
|
sb_start_intwrite(mp->m_super);
|
|
tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS);
|
|
tp->t_flags |= XFS_TRANS_RESERVE | XFS_TRANS_FREEZE_PROT;
|
|
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
|
|
resblks, 0);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return error;
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
/*
|
|
* Modify the unwritten extent state of the buffer.
|
|
*/
|
|
xfs_bmap_init(&free_list, &firstfsb);
|
|
nimaps = 1;
|
|
error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
|
|
XFS_BMAPI_CONVERT, &firstfsb,
|
|
1, &imap, &nimaps, &free_list);
|
|
if (error)
|
|
goto error_on_bmapi_transaction;
|
|
|
|
/*
|
|
* Log the updated inode size as we go. We have to be careful
|
|
* to only log it up to the actual write offset if it is
|
|
* halfway into a block.
|
|
*/
|
|
i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
|
|
if (i_size > offset + count)
|
|
i_size = offset + count;
|
|
|
|
i_size = xfs_new_eof(ip, i_size);
|
|
if (i_size) {
|
|
ip->i_d.di_size = i_size;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
}
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto error_on_bmapi_transaction;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_alert_fsblock_zero(ip, &imap);
|
|
|
|
if ((numblks_fsb = imap.br_blockcount) == 0) {
|
|
/*
|
|
* The numblks_fsb value should always get
|
|
* smaller, otherwise the loop is stuck.
|
|
*/
|
|
ASSERT(imap.br_blockcount);
|
|
break;
|
|
}
|
|
offset_fsb += numblks_fsb;
|
|
count_fsb -= numblks_fsb;
|
|
} while (count_fsb > 0);
|
|
|
|
return 0;
|
|
|
|
error_on_bmapi_transaction:
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|