240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
/*
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* Copyright (C) 2010 Red Hat, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_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_mount.h"
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#include "xfs_quota.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_alloc.h"
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#include "xfs_error.h"
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#include "xfs_extent_busy.h"
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#include "xfs_discard.h"
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#include "xfs_trace.h"
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#include "xfs_log.h"
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STATIC int
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xfs_trim_extents(
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struct xfs_mount *mp,
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xfs_agnumber_t agno,
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xfs_daddr_t start,
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xfs_daddr_t end,
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xfs_daddr_t minlen,
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__uint64_t *blocks_trimmed)
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{
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struct block_device *bdev = mp->m_ddev_targp->bt_bdev;
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struct xfs_btree_cur *cur;
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struct xfs_buf *agbp;
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struct xfs_perag *pag;
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int error;
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int i;
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pag = xfs_perag_get(mp, agno);
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error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
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if (error || !agbp)
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goto out_put_perag;
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cur = xfs_allocbt_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_CNT);
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/*
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* Force out the log. This means any transactions that might have freed
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* space before we took the AGF buffer lock are now on disk, and the
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* volatile disk cache is flushed.
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*/
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xfs_log_force(mp, XFS_LOG_SYNC);
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/*
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* Look up the longest btree in the AGF and start with it.
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*/
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error = xfs_alloc_lookup_ge(cur, 0,
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be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest), &i);
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if (error)
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goto out_del_cursor;
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/*
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* Loop until we are done with all extents that are large
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* enough to be worth discarding.
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*/
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while (i) {
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xfs_agblock_t fbno;
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xfs_extlen_t flen;
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xfs_daddr_t dbno;
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xfs_extlen_t dlen;
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error = xfs_alloc_get_rec(cur, &fbno, &flen, &i);
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if (error)
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goto out_del_cursor;
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XFS_WANT_CORRUPTED_GOTO(i == 1, out_del_cursor);
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ASSERT(flen <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest));
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/*
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* use daddr format for all range/len calculations as that is
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* the format the range/len variables are supplied in by
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* userspace.
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*/
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dbno = XFS_AGB_TO_DADDR(mp, agno, fbno);
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dlen = XFS_FSB_TO_BB(mp, flen);
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/*
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* Too small? Give up.
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*/
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if (dlen < minlen) {
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trace_xfs_discard_toosmall(mp, agno, fbno, flen);
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goto out_del_cursor;
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}
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/*
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* If the extent is entirely outside of the range we are
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* supposed to discard skip it. Do not bother to trim
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* down partially overlapping ranges for now.
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*/
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if (dbno + dlen < start || dbno > end) {
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trace_xfs_discard_exclude(mp, agno, fbno, flen);
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goto next_extent;
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}
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/*
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* If any blocks in the range are still busy, skip the
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* discard and try again the next time.
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*/
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if (xfs_extent_busy_search(mp, agno, fbno, flen)) {
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trace_xfs_discard_busy(mp, agno, fbno, flen);
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goto next_extent;
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}
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trace_xfs_discard_extent(mp, agno, fbno, flen);
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error = blkdev_issue_discard(bdev, dbno, dlen, GFP_NOFS, 0);
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if (error)
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goto out_del_cursor;
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*blocks_trimmed += flen;
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next_extent:
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error = xfs_btree_decrement(cur, 0, &i);
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if (error)
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goto out_del_cursor;
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}
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out_del_cursor:
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xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
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xfs_buf_relse(agbp);
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out_put_perag:
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xfs_perag_put(pag);
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return error;
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}
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/*
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* trim a range of the filesystem.
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*
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* Note: the parameters passed from userspace are byte ranges into the
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* filesystem which does not match to the format we use for filesystem block
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* addressing. FSB addressing is sparse (AGNO|AGBNO), while the incoming format
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* is a linear address range. Hence we need to use DADDR based conversions and
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* comparisons for determining the correct offset and regions to trim.
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*/
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int
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xfs_ioc_trim(
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struct xfs_mount *mp,
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struct fstrim_range __user *urange)
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{
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struct request_queue *q = bdev_get_queue(mp->m_ddev_targp->bt_bdev);
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unsigned int granularity = q->limits.discard_granularity;
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struct fstrim_range range;
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xfs_daddr_t start, end, minlen;
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xfs_agnumber_t start_agno, end_agno, agno;
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__uint64_t blocks_trimmed = 0;
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int error, last_error = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!blk_queue_discard(q))
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return -EOPNOTSUPP;
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if (copy_from_user(&range, urange, sizeof(range)))
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return -EFAULT;
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/*
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* Truncating down the len isn't actually quite correct, but using
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* BBTOB would mean we trivially get overflows for values
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* of ULLONG_MAX or slightly lower. And ULLONG_MAX is the default
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* used by the fstrim application. In the end it really doesn't
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* matter as trimming blocks is an advisory interface.
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*/
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if (range.start >= XFS_FSB_TO_B(mp, mp->m_sb.sb_dblocks) ||
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range.minlen > XFS_FSB_TO_B(mp, XFS_ALLOC_AG_MAX_USABLE(mp)) ||
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range.len < mp->m_sb.sb_blocksize)
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return -EINVAL;
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start = BTOBB(range.start);
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end = start + BTOBBT(range.len) - 1;
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minlen = BTOBB(max_t(u64, granularity, range.minlen));
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if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1)
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end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1;
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start_agno = xfs_daddr_to_agno(mp, start);
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end_agno = xfs_daddr_to_agno(mp, end);
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for (agno = start_agno; agno <= end_agno; agno++) {
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error = xfs_trim_extents(mp, agno, start, end, minlen,
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&blocks_trimmed);
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if (error)
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last_error = error;
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}
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if (last_error)
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return last_error;
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range.len = XFS_FSB_TO_B(mp, blocks_trimmed);
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if (copy_to_user(urange, &range, sizeof(range)))
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return -EFAULT;
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return 0;
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}
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int
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xfs_discard_extents(
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struct xfs_mount *mp,
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struct list_head *list)
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{
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struct xfs_extent_busy *busyp;
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int error = 0;
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list_for_each_entry(busyp, list, list) {
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trace_xfs_discard_extent(mp, busyp->agno, busyp->bno,
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busyp->length);
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error = blkdev_issue_discard(mp->m_ddev_targp->bt_bdev,
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XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno),
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XFS_FSB_TO_BB(mp, busyp->length),
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GFP_NOFS, 0);
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if (error && error != -EOPNOTSUPP) {
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xfs_info(mp,
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"discard failed for extent [0x%llu,%u], error %d",
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(unsigned long long)busyp->bno,
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busyp->length,
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error);
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return error;
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}
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}
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return 0;
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}
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