0b61f8a407
Remove the verbose license text from XFS files and replace them
with SPDX tags. This does not change the license of any of the code,
merely refers to the common, up-to-date license files in LICENSES/
This change was mostly scripted. fs/xfs/Makefile and
fs/xfs/libxfs/xfs_fs.h were modified by hand, the rest were detected
and modified by the following command:
for f in `git grep -l "GNU General" fs/xfs/` ; do
echo $f
cat $f | awk -f hdr.awk > $f.new
mv -f $f.new $f
done
And the hdr.awk script that did the modification (including
detecting the difference between GPL-2.0 and GPL-2.0+ licenses)
is as follows:
$ cat hdr.awk
BEGIN {
hdr = 1.0
tag = "GPL-2.0"
str = ""
}
/^ \* This program is free software/ {
hdr = 2.0;
next
}
/any later version./ {
tag = "GPL-2.0+"
next
}
/^ \*\// {
if (hdr > 0.0) {
print "// SPDX-License-Identifier: " tag
print str
print $0
str=""
hdr = 0.0
next
}
print $0
next
}
/^ \* / {
if (hdr > 1.0)
next
if (hdr > 0.0) {
if (str != "")
str = str "\n"
str = str $0
next
}
print $0
next
}
/^ \*/ {
if (hdr > 0.0)
next
print $0
next
}
// {
if (hdr > 0.0) {
if (str != "")
str = str "\n"
str = str $0
next
}
print $0
}
END { }
$
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
207 lines
5.3 KiB
C
207 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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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/*
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* Force out the log. This means any transactions that might have freed
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* space before we take 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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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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* 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(mp, 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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if (fatal_signal_pending(current)) {
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error = -ERESTARTSYS;
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goto out_del_cursor;
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}
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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, mp->m_ag_max_usable) ||
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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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if (error == -ERESTARTSYS)
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break;
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}
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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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