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![Christoph Hellwig](/assets/img/avatar_default.png)
Currently the calls to xfs_iext_count_may_overflow and xfs_iext_count_upgrade are always paired. Merge them into a single function to simplify the callers and the actual check and upgrade logic itself. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
1458 lines
38 KiB
C
1458 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_bmap_util.h"
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#include "xfs_trans.h"
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#include "xfs_trans_space.h"
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#include "xfs_icache.h"
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#include "xfs_rtalloc.h"
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#include "xfs_sb.h"
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#include "xfs_rtbitmap.h"
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#include "xfs_quota.h"
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#include "xfs_log_priv.h"
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#include "xfs_health.h"
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/*
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* Return whether there are any free extents in the size range given
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* by low and high, for the bitmap block bbno.
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*/
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STATIC int
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xfs_rtany_summary(
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struct xfs_rtalloc_args *args,
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int low, /* low log2 extent size */
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int high, /* high log2 extent size */
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xfs_fileoff_t bbno, /* bitmap block number */
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int *maxlog) /* out: max log2 extent size free */
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{
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struct xfs_mount *mp = args->mp;
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int error;
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int log; /* loop counter, log2 of ext. size */
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xfs_suminfo_t sum; /* summary data */
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/* There are no extents at levels >= m_rsum_cache[bbno]. */
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if (mp->m_rsum_cache) {
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high = min(high, mp->m_rsum_cache[bbno] - 1);
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if (low > high) {
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*maxlog = -1;
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return 0;
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}
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}
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/*
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* Loop over logs of extent sizes.
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*/
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for (log = high; log >= low; log--) {
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/*
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* Get one summary datum.
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*/
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error = xfs_rtget_summary(args, log, bbno, &sum);
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if (error) {
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return error;
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}
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/*
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* If there are any, return success.
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*/
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if (sum) {
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*maxlog = log;
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goto out;
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}
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}
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/*
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* Found nothing, return failure.
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*/
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*maxlog = -1;
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out:
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/* There were no extents at levels > log. */
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if (mp->m_rsum_cache && log + 1 < mp->m_rsum_cache[bbno])
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mp->m_rsum_cache[bbno] = log + 1;
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return 0;
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}
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/*
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* Copy and transform the summary file, given the old and new
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* parameters in the mount structures.
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*/
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STATIC int
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xfs_rtcopy_summary(
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struct xfs_rtalloc_args *oargs,
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struct xfs_rtalloc_args *nargs)
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{
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xfs_fileoff_t bbno; /* bitmap block number */
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int error;
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int log; /* summary level number (log length) */
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xfs_suminfo_t sum; /* summary data */
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for (log = oargs->mp->m_rsumlevels - 1; log >= 0; log--) {
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for (bbno = oargs->mp->m_sb.sb_rbmblocks - 1;
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(xfs_srtblock_t)bbno >= 0;
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bbno--) {
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error = xfs_rtget_summary(oargs, log, bbno, &sum);
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if (error)
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goto out;
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if (sum == 0)
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continue;
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error = xfs_rtmodify_summary(oargs, log, bbno, -sum);
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if (error)
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goto out;
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error = xfs_rtmodify_summary(nargs, log, bbno, sum);
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if (error)
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goto out;
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ASSERT(sum > 0);
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}
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}
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error = 0;
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out:
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xfs_rtbuf_cache_relse(oargs);
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return 0;
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}
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/*
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* Mark an extent specified by start and len allocated.
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* Updates all the summary information as well as the bitmap.
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*/
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STATIC int
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xfs_rtallocate_range(
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struct xfs_rtalloc_args *args,
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xfs_rtxnum_t start, /* start rtext to allocate */
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xfs_rtxlen_t len) /* in/out: summary block number */
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{
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struct xfs_mount *mp = args->mp;
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xfs_rtxnum_t end; /* end of the allocated rtext */
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int error;
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xfs_rtxnum_t postblock = 0; /* first rtext allocated > end */
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xfs_rtxnum_t preblock = 0; /* first rtext allocated < start */
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end = start + len - 1;
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/*
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* Assume we're allocating out of the middle of a free extent.
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* We need to find the beginning and end of the extent so we can
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* properly update the summary.
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*/
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error = xfs_rtfind_back(args, start, 0, &preblock);
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if (error)
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return error;
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/*
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* Find the next allocated block (end of free extent).
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*/
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error = xfs_rtfind_forw(args, end, mp->m_sb.sb_rextents - 1,
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&postblock);
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if (error)
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return error;
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/*
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* Decrement the summary information corresponding to the entire
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* (old) free extent.
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*/
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error = xfs_rtmodify_summary(args,
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xfs_highbit64(postblock + 1 - preblock),
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xfs_rtx_to_rbmblock(mp, preblock), -1);
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if (error)
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return error;
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/*
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* If there are blocks not being allocated at the front of the
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* old extent, add summary data for them to be free.
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*/
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if (preblock < start) {
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error = xfs_rtmodify_summary(args,
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xfs_highbit64(start - preblock),
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xfs_rtx_to_rbmblock(mp, preblock), 1);
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if (error)
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return error;
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}
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/*
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* If there are blocks not being allocated at the end of the
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* old extent, add summary data for them to be free.
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*/
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if (postblock > end) {
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error = xfs_rtmodify_summary(args,
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xfs_highbit64(postblock - end),
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xfs_rtx_to_rbmblock(mp, end + 1), 1);
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if (error)
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return error;
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}
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/*
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* Modify the bitmap to mark this extent allocated.
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*/
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return xfs_rtmodify_range(args, start, len, 0);
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}
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/*
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* Make sure we don't run off the end of the rt volume. Be careful that
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* adjusting maxlen downwards doesn't cause us to fail the alignment checks.
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*/
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static inline xfs_rtxlen_t
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xfs_rtallocate_clamp_len(
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struct xfs_mount *mp,
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xfs_rtxnum_t startrtx,
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xfs_rtxlen_t rtxlen,
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xfs_rtxlen_t prod)
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{
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xfs_rtxlen_t ret;
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ret = min(mp->m_sb.sb_rextents, startrtx + rtxlen) - startrtx;
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return rounddown(ret, prod);
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}
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/*
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* Attempt to allocate an extent minlen<=len<=maxlen starting from
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* bitmap block bbno. If we don't get maxlen then use prod to trim
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* the length, if given. Returns error; returns starting block in *rtx.
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* The lengths are all in rtextents.
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*/
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STATIC int
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xfs_rtallocate_extent_block(
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struct xfs_rtalloc_args *args,
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xfs_fileoff_t bbno, /* bitmap block number */
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xfs_rtxlen_t minlen, /* minimum length to allocate */
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xfs_rtxlen_t maxlen, /* maximum length to allocate */
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xfs_rtxlen_t *len, /* out: actual length allocated */
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xfs_rtxnum_t *nextp, /* out: next rtext to try */
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xfs_rtxlen_t prod, /* extent product factor */
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xfs_rtxnum_t *rtx) /* out: start rtext allocated */
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{
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struct xfs_mount *mp = args->mp;
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xfs_rtxnum_t besti; /* best rtext found so far */
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xfs_rtxnum_t bestlen;/* best length found so far */
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xfs_rtxnum_t end; /* last rtext in chunk */
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int error;
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xfs_rtxnum_t i; /* current rtext trying */
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xfs_rtxnum_t next; /* next rtext to try */
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int stat; /* status from internal calls */
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/*
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* Loop over all the extents starting in this bitmap block,
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* looking for one that's long enough.
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*/
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for (i = xfs_rbmblock_to_rtx(mp, bbno), besti = -1, bestlen = 0,
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end = xfs_rbmblock_to_rtx(mp, bbno + 1) - 1;
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i <= end;
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i++) {
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/* Make sure we don't scan off the end of the rt volume. */
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maxlen = xfs_rtallocate_clamp_len(mp, i, maxlen, prod);
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/*
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* See if there's a free extent of maxlen starting at i.
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* If it's not so then next will contain the first non-free.
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*/
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error = xfs_rtcheck_range(args, i, maxlen, 1, &next, &stat);
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if (error)
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return error;
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if (stat) {
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/*
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* i for maxlen is all free, allocate and return that.
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*/
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bestlen = maxlen;
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besti = i;
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goto allocate;
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}
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/*
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* In the case where we have a variable-sized allocation
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* request, figure out how big this free piece is,
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* and if it's big enough for the minimum, and the best
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* so far, remember it.
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*/
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if (minlen < maxlen) {
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xfs_rtxnum_t thislen; /* this extent size */
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thislen = next - i;
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if (thislen >= minlen && thislen > bestlen) {
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besti = i;
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bestlen = thislen;
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}
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}
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/*
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* If not done yet, find the start of the next free space.
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*/
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if (next >= end)
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break;
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error = xfs_rtfind_forw(args, next, end, &i);
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if (error)
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return error;
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}
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/*
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* Searched the whole thing & didn't find a maxlen free extent.
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*/
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if (minlen > maxlen || besti == -1) {
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/*
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* Allocation failed. Set *nextp to the next block to try.
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*/
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*nextp = next;
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return -ENOSPC;
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}
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/*
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* If size should be a multiple of prod, make that so.
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*/
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if (prod > 1) {
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xfs_rtxlen_t p; /* amount to trim length by */
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div_u64_rem(bestlen, prod, &p);
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if (p)
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bestlen -= p;
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}
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/*
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* Allocate besti for bestlen & return that.
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*/
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allocate:
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error = xfs_rtallocate_range(args, besti, bestlen);
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if (error)
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return error;
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*len = bestlen;
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*rtx = besti;
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return 0;
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}
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/*
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* Allocate an extent of length minlen<=len<=maxlen, starting at block
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* bno. If we don't get maxlen then use prod to trim the length, if given.
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* Returns error; returns starting block in *rtx.
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* The lengths are all in rtextents.
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*/
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STATIC int
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xfs_rtallocate_extent_exact(
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struct xfs_rtalloc_args *args,
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xfs_rtxnum_t start, /* starting rtext number to allocate */
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xfs_rtxlen_t minlen, /* minimum length to allocate */
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xfs_rtxlen_t maxlen, /* maximum length to allocate */
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xfs_rtxlen_t *len, /* out: actual length allocated */
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xfs_rtxlen_t prod, /* extent product factor */
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xfs_rtxnum_t *rtx) /* out: start rtext allocated */
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{
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int error;
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xfs_rtxlen_t i; /* extent length trimmed due to prod */
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int isfree; /* extent is free */
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xfs_rtxnum_t next; /* next rtext to try (dummy) */
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ASSERT(minlen % prod == 0);
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ASSERT(maxlen % prod == 0);
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/*
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* Check if the range in question (for maxlen) is free.
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*/
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error = xfs_rtcheck_range(args, start, maxlen, 1, &next, &isfree);
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if (error)
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return error;
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if (!isfree) {
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/*
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* If not, allocate what there is, if it's at least minlen.
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*/
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maxlen = next - start;
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if (maxlen < minlen)
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return -ENOSPC;
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/*
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* Trim off tail of extent, if prod is specified.
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*/
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if (prod > 1 && (i = maxlen % prod)) {
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maxlen -= i;
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if (maxlen < minlen)
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return -ENOSPC;
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}
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}
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/*
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* Allocate what we can and return it.
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*/
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error = xfs_rtallocate_range(args, start, maxlen);
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if (error)
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return error;
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*len = maxlen;
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*rtx = start;
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return 0;
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}
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/*
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* Allocate an extent of length minlen<=len<=maxlen, starting as near
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* to start as possible. If we don't get maxlen then use prod to trim
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* the length, if given. The lengths are all in rtextents.
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*/
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STATIC int
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xfs_rtallocate_extent_near(
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struct xfs_rtalloc_args *args,
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xfs_rtxnum_t start, /* starting rtext number to allocate */
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xfs_rtxlen_t minlen, /* minimum length to allocate */
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xfs_rtxlen_t maxlen, /* maximum length to allocate */
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xfs_rtxlen_t *len, /* out: actual length allocated */
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xfs_rtxlen_t prod, /* extent product factor */
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xfs_rtxnum_t *rtx) /* out: start rtext allocated */
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{
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struct xfs_mount *mp = args->mp;
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int maxlog; /* max useful extent from summary */
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xfs_fileoff_t bbno; /* bitmap block number */
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int error;
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int i; /* bitmap block offset (loop control) */
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int j; /* secondary loop control */
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int log2len; /* log2 of minlen */
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xfs_rtxnum_t n; /* next rtext to try */
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ASSERT(minlen % prod == 0);
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ASSERT(maxlen % prod == 0);
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/*
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* If the block number given is off the end, silently set it to
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* the last block.
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*/
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if (start >= mp->m_sb.sb_rextents)
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start = mp->m_sb.sb_rextents - 1;
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/* Make sure we don't run off the end of the rt volume. */
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maxlen = xfs_rtallocate_clamp_len(mp, start, maxlen, prod);
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if (maxlen < minlen)
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return -ENOSPC;
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/*
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* Try the exact allocation first.
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*/
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error = xfs_rtallocate_extent_exact(args, start, minlen, maxlen, len,
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prod, rtx);
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if (error != -ENOSPC)
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return error;
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bbno = xfs_rtx_to_rbmblock(mp, start);
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i = 0;
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j = -1;
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ASSERT(minlen != 0);
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log2len = xfs_highbit32(minlen);
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/*
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* Loop over all bitmap blocks (bbno + i is current block).
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*/
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for (;;) {
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/*
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* Get summary information of extents of all useful levels
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* starting in this bitmap block.
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*/
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error = xfs_rtany_summary(args, log2len, mp->m_rsumlevels - 1,
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bbno + i, &maxlog);
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if (error)
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return error;
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/*
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* If there are any useful extents starting here, try
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* allocating one.
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*/
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if (maxlog >= 0) {
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xfs_extlen_t maxavail =
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min_t(xfs_rtblock_t, maxlen,
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(1ULL << (maxlog + 1)) - 1);
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/*
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* On the positive side of the starting location.
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*/
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if (i >= 0) {
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/*
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* Try to allocate an extent starting in
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* this block.
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*/
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error = xfs_rtallocate_extent_block(args,
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bbno + i, minlen, maxavail, len,
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&n, prod, rtx);
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if (error != -ENOSPC)
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return error;
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}
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/*
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* On the negative side of the starting location.
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*/
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else { /* i < 0 */
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int maxblocks;
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/*
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* Loop backwards to find the end of the extent
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* we found in the realtime summary.
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*
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* maxblocks is the maximum possible number of
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* bitmap blocks from the start of the extent
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* to the end of the extent.
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*/
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if (maxlog == 0)
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maxblocks = 0;
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else if (maxlog < mp->m_blkbit_log)
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maxblocks = 1;
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else
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maxblocks = 2 << (maxlog - mp->m_blkbit_log);
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|
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/*
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* We need to check bbno + i + maxblocks down to
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* bbno + i. We already checked bbno down to
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* bbno + j + 1, so we don't need to check those
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* again.
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*/
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j = min(i + maxblocks, j);
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for (; j >= i; j--) {
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error = xfs_rtallocate_extent_block(args,
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bbno + j, minlen,
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maxavail, len, &n, prod,
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rtx);
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if (error != -ENOSPC)
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return error;
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}
|
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}
|
|
}
|
|
/*
|
|
* Loop control. If we were on the positive side, and there's
|
|
* still more blocks on the negative side, go there.
|
|
*/
|
|
if (i > 0 && (int)bbno - i >= 0)
|
|
i = -i;
|
|
/*
|
|
* If positive, and no more negative, but there are more
|
|
* positive, go there.
|
|
*/
|
|
else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
|
|
i++;
|
|
/*
|
|
* If negative or 0 (just started), and there are positive
|
|
* blocks to go, go there. The 0 case moves to block 1.
|
|
*/
|
|
else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
|
|
i = 1 - i;
|
|
/*
|
|
* If negative or 0 and there are more negative blocks,
|
|
* go there.
|
|
*/
|
|
else if (i <= 0 && (int)bbno + i > 0)
|
|
i--;
|
|
/*
|
|
* Must be done. Return failure.
|
|
*/
|
|
else
|
|
break;
|
|
}
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static int
|
|
xfs_rtalloc_sumlevel(
|
|
struct xfs_rtalloc_args *args,
|
|
int l, /* level number */
|
|
xfs_rtxlen_t minlen, /* minimum length to allocate */
|
|
xfs_rtxlen_t maxlen, /* maximum length to allocate */
|
|
xfs_rtxlen_t prod, /* extent product factor */
|
|
xfs_rtxlen_t *len, /* out: actual length allocated */
|
|
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
|
|
{
|
|
xfs_fileoff_t i; /* bitmap block number */
|
|
|
|
for (i = 0; i < args->mp->m_sb.sb_rbmblocks; i++) {
|
|
xfs_suminfo_t sum; /* summary information for extents */
|
|
xfs_rtxnum_t n; /* next rtext to be tried */
|
|
int error;
|
|
|
|
error = xfs_rtget_summary(args, l, i, &sum);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Nothing there, on to the next block.
|
|
*/
|
|
if (!sum)
|
|
continue;
|
|
|
|
/*
|
|
* Try allocating the extent.
|
|
*/
|
|
error = xfs_rtallocate_extent_block(args, i, minlen, maxlen,
|
|
len, &n, prod, rtx);
|
|
if (error != -ENOSPC)
|
|
return error;
|
|
|
|
/*
|
|
* If the "next block to try" returned from the allocator is
|
|
* beyond the next bitmap block, skip to that bitmap block.
|
|
*/
|
|
if (xfs_rtx_to_rbmblock(args->mp, n) > i + 1)
|
|
i = xfs_rtx_to_rbmblock(args->mp, n) - 1;
|
|
}
|
|
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/*
|
|
* Allocate an extent of length minlen<=len<=maxlen, with no position
|
|
* specified. If we don't get maxlen then use prod to trim
|
|
* the length, if given. The lengths are all in rtextents.
|
|
*/
|
|
STATIC int
|
|
xfs_rtallocate_extent_size(
|
|
struct xfs_rtalloc_args *args,
|
|
xfs_rtxlen_t minlen, /* minimum length to allocate */
|
|
xfs_rtxlen_t maxlen, /* maximum length to allocate */
|
|
xfs_rtxlen_t *len, /* out: actual length allocated */
|
|
xfs_rtxlen_t prod, /* extent product factor */
|
|
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
|
|
{
|
|
int error;
|
|
int l; /* level number (loop control) */
|
|
|
|
ASSERT(minlen % prod == 0);
|
|
ASSERT(maxlen % prod == 0);
|
|
ASSERT(maxlen != 0);
|
|
|
|
/*
|
|
* Loop over all the levels starting with maxlen.
|
|
*
|
|
* At each level, look at all the bitmap blocks, to see if there are
|
|
* extents starting there that are long enough (>= maxlen).
|
|
*
|
|
* Note, only on the initial level can the allocation fail if the
|
|
* summary says there's an extent.
|
|
*/
|
|
for (l = xfs_highbit32(maxlen); l < args->mp->m_rsumlevels; l++) {
|
|
error = xfs_rtalloc_sumlevel(args, l, minlen, maxlen, prod, len,
|
|
rtx);
|
|
if (error != -ENOSPC)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Didn't find any maxlen blocks. Try smaller ones, unless we are
|
|
* looking for a fixed size extent.
|
|
*/
|
|
if (minlen > --maxlen)
|
|
return -ENOSPC;
|
|
ASSERT(minlen != 0);
|
|
ASSERT(maxlen != 0);
|
|
|
|
/*
|
|
* Loop over sizes, from maxlen down to minlen.
|
|
*
|
|
* This time, when we do the allocations, allow smaller ones to succeed,
|
|
* but make sure the specified minlen/maxlen are in the possible range
|
|
* for this summary level.
|
|
*/
|
|
for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
|
|
error = xfs_rtalloc_sumlevel(args, l,
|
|
max_t(xfs_rtxlen_t, minlen, 1 << l),
|
|
min_t(xfs_rtxlen_t, maxlen, (1 << (l + 1)) - 1),
|
|
prod, len, rtx);
|
|
if (error != -ENOSPC)
|
|
return error;
|
|
}
|
|
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/*
|
|
* Allocate space to the bitmap or summary file, and zero it, for growfs.
|
|
*/
|
|
STATIC int
|
|
xfs_growfs_rt_alloc(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
xfs_extlen_t oblocks, /* old count of blocks */
|
|
xfs_extlen_t nblocks, /* new count of blocks */
|
|
struct xfs_inode *ip) /* inode (bitmap/summary) */
|
|
{
|
|
xfs_fileoff_t bno; /* block number in file */
|
|
struct xfs_buf *bp; /* temporary buffer for zeroing */
|
|
xfs_daddr_t d; /* disk block address */
|
|
int error; /* error return value */
|
|
xfs_fsblock_t fsbno; /* filesystem block for bno */
|
|
struct xfs_bmbt_irec map; /* block map output */
|
|
int nmap; /* number of block maps */
|
|
int resblks; /* space reservation */
|
|
enum xfs_blft buf_type;
|
|
struct xfs_trans *tp;
|
|
|
|
if (ip == mp->m_rsumip)
|
|
buf_type = XFS_BLFT_RTSUMMARY_BUF;
|
|
else
|
|
buf_type = XFS_BLFT_RTBITMAP_BUF;
|
|
|
|
/*
|
|
* Allocate space to the file, as necessary.
|
|
*/
|
|
while (oblocks < nblocks) {
|
|
resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
|
|
/*
|
|
* Reserve space & log for one extent added to the file.
|
|
*/
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc, resblks,
|
|
0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Lock the inode.
|
|
*/
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
|
|
error = xfs_iext_count_extend(tp, ip, XFS_DATA_FORK,
|
|
XFS_IEXT_ADD_NOSPLIT_CNT);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
/*
|
|
* Allocate blocks to the bitmap file.
|
|
*/
|
|
nmap = 1;
|
|
error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
|
|
XFS_BMAPI_METADATA, 0, &map, &nmap);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
/*
|
|
* Free any blocks freed up in the transaction, then commit.
|
|
*/
|
|
error = xfs_trans_commit(tp);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Now we need to clear the allocated blocks.
|
|
* Do this one block per transaction, to keep it simple.
|
|
*/
|
|
for (bno = map.br_startoff, fsbno = map.br_startblock;
|
|
bno < map.br_startoff + map.br_blockcount;
|
|
bno++, fsbno++) {
|
|
/*
|
|
* Reserve log for one block zeroing.
|
|
*/
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero,
|
|
0, 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Lock the bitmap inode.
|
|
*/
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
/*
|
|
* Get a buffer for the block.
|
|
*/
|
|
d = XFS_FSB_TO_DADDR(mp, fsbno);
|
|
error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
|
|
mp->m_bsize, 0, &bp);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
xfs_trans_buf_set_type(tp, bp, buf_type);
|
|
bp->b_ops = &xfs_rtbuf_ops;
|
|
memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
|
|
xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
|
|
/*
|
|
* Commit the transaction.
|
|
*/
|
|
error = xfs_trans_commit(tp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
/*
|
|
* Go on to the next extent, if any.
|
|
*/
|
|
oblocks = map.br_startoff + map.br_blockcount;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
xfs_alloc_rsum_cache(
|
|
xfs_mount_t *mp, /* file system mount structure */
|
|
xfs_extlen_t rbmblocks) /* number of rt bitmap blocks */
|
|
{
|
|
/*
|
|
* The rsum cache is initialized to the maximum value, which is
|
|
* trivially an upper bound on the maximum level with any free extents.
|
|
* We can continue without the cache if it couldn't be allocated.
|
|
*/
|
|
mp->m_rsum_cache = kvmalloc(rbmblocks, GFP_KERNEL);
|
|
if (mp->m_rsum_cache)
|
|
memset(mp->m_rsum_cache, -1, rbmblocks);
|
|
else
|
|
xfs_warn(mp, "could not allocate realtime summary cache");
|
|
}
|
|
|
|
/*
|
|
* Visible (exported) functions.
|
|
*/
|
|
|
|
/*
|
|
* Grow the realtime area of the filesystem.
|
|
*/
|
|
int
|
|
xfs_growfs_rt(
|
|
xfs_mount_t *mp, /* mount point for filesystem */
|
|
xfs_growfs_rt_t *in) /* growfs rt input struct */
|
|
{
|
|
xfs_fileoff_t bmbno; /* bitmap block number */
|
|
struct xfs_buf *bp; /* temporary buffer */
|
|
int error; /* error return value */
|
|
xfs_mount_t *nmp; /* new (fake) mount structure */
|
|
xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
|
|
xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
|
|
xfs_rtxnum_t nrextents; /* new number of realtime extents */
|
|
uint8_t nrextslog; /* new log2 of sb_rextents */
|
|
xfs_extlen_t nrsumblocks; /* new number of summary blocks */
|
|
uint nrsumlevels; /* new rt summary levels */
|
|
uint nrsumsize; /* new size of rt summary, bytes */
|
|
xfs_sb_t *nsbp; /* new superblock */
|
|
xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
|
|
xfs_extlen_t rsumblocks; /* current number of rt summary blks */
|
|
xfs_sb_t *sbp; /* old superblock */
|
|
uint8_t *rsum_cache; /* old summary cache */
|
|
|
|
sbp = &mp->m_sb;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* Needs to have been mounted with an rt device. */
|
|
if (!XFS_IS_REALTIME_MOUNT(mp))
|
|
return -EINVAL;
|
|
/*
|
|
* Mount should fail if the rt bitmap/summary files don't load, but
|
|
* we'll check anyway.
|
|
*/
|
|
if (!mp->m_rbmip || !mp->m_rsumip)
|
|
return -EINVAL;
|
|
|
|
/* Shrink not supported. */
|
|
if (in->newblocks <= sbp->sb_rblocks)
|
|
return -EINVAL;
|
|
|
|
/* Can only change rt extent size when adding rt volume. */
|
|
if (sbp->sb_rblocks > 0 && in->extsize != sbp->sb_rextsize)
|
|
return -EINVAL;
|
|
|
|
/* Range check the extent size. */
|
|
if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE ||
|
|
XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
|
|
return -EINVAL;
|
|
|
|
/* Unsupported realtime features. */
|
|
if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp))
|
|
return -EOPNOTSUPP;
|
|
|
|
nrblocks = in->newblocks;
|
|
error = xfs_sb_validate_fsb_count(sbp, nrblocks);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Read in the last block of the device, make sure it exists.
|
|
*/
|
|
error = xfs_buf_read_uncached(mp->m_rtdev_targp,
|
|
XFS_FSB_TO_BB(mp, nrblocks - 1),
|
|
XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
|
|
if (error)
|
|
return error;
|
|
xfs_buf_relse(bp);
|
|
|
|
/*
|
|
* Calculate new parameters. These are the final values to be reached.
|
|
*/
|
|
nrextents = nrblocks;
|
|
do_div(nrextents, in->extsize);
|
|
if (!xfs_validate_rtextents(nrextents))
|
|
return -EINVAL;
|
|
nrbmblocks = xfs_rtbitmap_blockcount(mp, nrextents);
|
|
nrextslog = xfs_compute_rextslog(nrextents);
|
|
nrsumlevels = nrextslog + 1;
|
|
nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels, nrbmblocks);
|
|
nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
|
|
/*
|
|
* New summary size can't be more than half the size of
|
|
* the log. This prevents us from getting a log overflow,
|
|
* since we'll log basically the whole summary file at once.
|
|
*/
|
|
if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
|
|
return -EINVAL;
|
|
/*
|
|
* Get the old block counts for bitmap and summary inodes.
|
|
* These can't change since other growfs callers are locked out.
|
|
*/
|
|
rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_disk_size);
|
|
rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_disk_size);
|
|
/*
|
|
* Allocate space to the bitmap and summary files, as necessary.
|
|
*/
|
|
error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
|
|
if (error)
|
|
return error;
|
|
error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
|
|
if (error)
|
|
return error;
|
|
|
|
rsum_cache = mp->m_rsum_cache;
|
|
if (nrbmblocks != sbp->sb_rbmblocks)
|
|
xfs_alloc_rsum_cache(mp, nrbmblocks);
|
|
|
|
/*
|
|
* Allocate a new (fake) mount/sb.
|
|
*/
|
|
nmp = kmalloc(sizeof(*nmp), GFP_KERNEL | __GFP_NOFAIL);
|
|
/*
|
|
* Loop over the bitmap blocks.
|
|
* We will do everything one bitmap block at a time.
|
|
* Skip the current block if it is exactly full.
|
|
* This also deals with the case where there were no rtextents before.
|
|
*/
|
|
for (bmbno = sbp->sb_rbmblocks -
|
|
((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
|
|
bmbno < nrbmblocks;
|
|
bmbno++) {
|
|
struct xfs_rtalloc_args args = {
|
|
.mp = mp,
|
|
};
|
|
struct xfs_rtalloc_args nargs = {
|
|
.mp = nmp,
|
|
};
|
|
struct xfs_trans *tp;
|
|
xfs_rfsblock_t nrblocks_step;
|
|
|
|
*nmp = *mp;
|
|
nsbp = &nmp->m_sb;
|
|
/*
|
|
* Calculate new sb and mount fields for this round.
|
|
*/
|
|
nsbp->sb_rextsize = in->extsize;
|
|
nmp->m_rtxblklog = -1; /* don't use shift or masking */
|
|
nsbp->sb_rbmblocks = bmbno + 1;
|
|
nrblocks_step = (bmbno + 1) * NBBY * nsbp->sb_blocksize *
|
|
nsbp->sb_rextsize;
|
|
nsbp->sb_rblocks = min(nrblocks, nrblocks_step);
|
|
nsbp->sb_rextents = xfs_rtb_to_rtx(nmp, nsbp->sb_rblocks);
|
|
ASSERT(nsbp->sb_rextents != 0);
|
|
nsbp->sb_rextslog = xfs_compute_rextslog(nsbp->sb_rextents);
|
|
nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
|
|
nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels,
|
|
nsbp->sb_rbmblocks);
|
|
nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
|
|
/* recompute growfsrt reservation from new rsumsize */
|
|
xfs_trans_resv_calc(nmp, &nmp->m_resv);
|
|
|
|
/*
|
|
* Start a transaction, get the log reservation.
|
|
*/
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtfree, 0, 0, 0,
|
|
&tp);
|
|
if (error)
|
|
break;
|
|
args.tp = tp;
|
|
nargs.tp = tp;
|
|
|
|
/*
|
|
* Lock out other callers by grabbing the bitmap and summary
|
|
* inode locks and joining them to the transaction.
|
|
*/
|
|
xfs_rtbitmap_lock(tp, mp);
|
|
/*
|
|
* Update the bitmap inode's size ondisk and incore. We need
|
|
* to update the incore size so that inode inactivation won't
|
|
* punch what it thinks are "posteof" blocks.
|
|
*/
|
|
mp->m_rbmip->i_disk_size =
|
|
nsbp->sb_rbmblocks * nsbp->sb_blocksize;
|
|
i_size_write(VFS_I(mp->m_rbmip), mp->m_rbmip->i_disk_size);
|
|
xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
|
|
/*
|
|
* Update the summary inode's size. We need to update the
|
|
* incore size so that inode inactivation won't punch what it
|
|
* thinks are "posteof" blocks.
|
|
*/
|
|
mp->m_rsumip->i_disk_size = nmp->m_rsumsize;
|
|
i_size_write(VFS_I(mp->m_rsumip), mp->m_rsumip->i_disk_size);
|
|
xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
|
|
/*
|
|
* Copy summary data from old to new sizes.
|
|
* Do this when the real size (not block-aligned) changes.
|
|
*/
|
|
if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
|
|
mp->m_rsumlevels != nmp->m_rsumlevels) {
|
|
error = xfs_rtcopy_summary(&args, &nargs);
|
|
if (error)
|
|
goto error_cancel;
|
|
}
|
|
/*
|
|
* Update superblock fields.
|
|
*/
|
|
if (nsbp->sb_rextsize != sbp->sb_rextsize)
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
|
|
nsbp->sb_rextsize - sbp->sb_rextsize);
|
|
if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
|
|
nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
|
|
if (nsbp->sb_rblocks != sbp->sb_rblocks)
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
|
|
nsbp->sb_rblocks - sbp->sb_rblocks);
|
|
if (nsbp->sb_rextents != sbp->sb_rextents)
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
|
|
nsbp->sb_rextents - sbp->sb_rextents);
|
|
if (nsbp->sb_rextslog != sbp->sb_rextslog)
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
|
|
nsbp->sb_rextslog - sbp->sb_rextslog);
|
|
/*
|
|
* Free new extent.
|
|
*/
|
|
error = xfs_rtfree_range(&nargs, sbp->sb_rextents,
|
|
nsbp->sb_rextents - sbp->sb_rextents);
|
|
xfs_rtbuf_cache_relse(&nargs);
|
|
if (error) {
|
|
error_cancel:
|
|
xfs_trans_cancel(tp);
|
|
break;
|
|
}
|
|
/*
|
|
* Mark more blocks free in the superblock.
|
|
*/
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
|
|
nsbp->sb_rextents - sbp->sb_rextents);
|
|
/*
|
|
* Update mp values into the real mp structure.
|
|
*/
|
|
mp->m_rsumlevels = nrsumlevels;
|
|
mp->m_rsumsize = nrsumsize;
|
|
/* recompute growfsrt reservation from new rsumsize */
|
|
xfs_trans_resv_calc(mp, &mp->m_resv);
|
|
|
|
error = xfs_trans_commit(tp);
|
|
if (error)
|
|
break;
|
|
|
|
/* Ensure the mount RT feature flag is now set. */
|
|
mp->m_features |= XFS_FEAT_REALTIME;
|
|
}
|
|
if (error)
|
|
goto out_free;
|
|
|
|
/* Update secondary superblocks now the physical grow has completed */
|
|
error = xfs_update_secondary_sbs(mp);
|
|
|
|
out_free:
|
|
/*
|
|
* Free the fake mp structure.
|
|
*/
|
|
kfree(nmp);
|
|
|
|
/*
|
|
* If we had to allocate a new rsum_cache, we either need to free the
|
|
* old one (if we succeeded) or free the new one and restore the old one
|
|
* (if there was an error).
|
|
*/
|
|
if (rsum_cache != mp->m_rsum_cache) {
|
|
if (error) {
|
|
kvfree(mp->m_rsum_cache);
|
|
mp->m_rsum_cache = rsum_cache;
|
|
} else {
|
|
kvfree(rsum_cache);
|
|
}
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Initialize realtime fields in the mount structure.
|
|
*/
|
|
int /* error */
|
|
xfs_rtmount_init(
|
|
struct xfs_mount *mp) /* file system mount structure */
|
|
{
|
|
struct xfs_buf *bp; /* buffer for last block of subvolume */
|
|
struct xfs_sb *sbp; /* filesystem superblock copy in mount */
|
|
xfs_daddr_t d; /* address of last block of subvolume */
|
|
unsigned int rsumblocks;
|
|
int error;
|
|
|
|
sbp = &mp->m_sb;
|
|
if (sbp->sb_rblocks == 0)
|
|
return 0;
|
|
if (mp->m_rtdev_targp == NULL) {
|
|
xfs_warn(mp,
|
|
"Filesystem has a realtime volume, use rtdev=device option");
|
|
return -ENODEV;
|
|
}
|
|
mp->m_rsumlevels = sbp->sb_rextslog + 1;
|
|
rsumblocks = xfs_rtsummary_blockcount(mp, mp->m_rsumlevels,
|
|
mp->m_sb.sb_rbmblocks);
|
|
mp->m_rsumsize = XFS_FSB_TO_B(mp, rsumblocks);
|
|
mp->m_rbmip = mp->m_rsumip = NULL;
|
|
/*
|
|
* Check that the realtime section is an ok size.
|
|
*/
|
|
d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
|
|
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
|
|
xfs_warn(mp, "realtime mount -- %llu != %llu",
|
|
(unsigned long long) XFS_BB_TO_FSB(mp, d),
|
|
(unsigned long long) mp->m_sb.sb_rblocks);
|
|
return -EFBIG;
|
|
}
|
|
error = xfs_buf_read_uncached(mp->m_rtdev_targp,
|
|
d - XFS_FSB_TO_BB(mp, 1),
|
|
XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
|
|
if (error) {
|
|
xfs_warn(mp, "realtime device size check failed");
|
|
return error;
|
|
}
|
|
xfs_buf_relse(bp);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xfs_rtalloc_count_frextent(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
const struct xfs_rtalloc_rec *rec,
|
|
void *priv)
|
|
{
|
|
uint64_t *valp = priv;
|
|
|
|
*valp += rec->ar_extcount;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reinitialize the number of free realtime extents from the realtime bitmap.
|
|
* Callers must ensure that there is no other activity in the filesystem.
|
|
*/
|
|
int
|
|
xfs_rtalloc_reinit_frextents(
|
|
struct xfs_mount *mp)
|
|
{
|
|
uint64_t val = 0;
|
|
int error;
|
|
|
|
xfs_rtbitmap_lock_shared(mp, XFS_RBMLOCK_BITMAP);
|
|
error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
|
|
&val);
|
|
xfs_rtbitmap_unlock_shared(mp, XFS_RBMLOCK_BITMAP);
|
|
if (error)
|
|
return error;
|
|
|
|
spin_lock(&mp->m_sb_lock);
|
|
mp->m_sb.sb_frextents = val;
|
|
spin_unlock(&mp->m_sb_lock);
|
|
percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read in the bmbt of an rt metadata inode so that we never have to load them
|
|
* at runtime. This enables the use of shared ILOCKs for rtbitmap scans. Use
|
|
* an empty transaction to avoid deadlocking on loops in the bmbt.
|
|
*/
|
|
static inline int
|
|
xfs_rtmount_iread_extents(
|
|
struct xfs_inode *ip,
|
|
unsigned int lock_class)
|
|
{
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
|
|
error = xfs_trans_alloc_empty(ip->i_mount, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class);
|
|
|
|
error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
if (xfs_inode_has_attr_fork(ip)) {
|
|
error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK);
|
|
if (error)
|
|
goto out_unlock;
|
|
}
|
|
|
|
out_unlock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class);
|
|
xfs_trans_cancel(tp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Get the bitmap and summary inodes and the summary cache into the mount
|
|
* structure at mount time.
|
|
*/
|
|
int /* error */
|
|
xfs_rtmount_inodes(
|
|
xfs_mount_t *mp) /* file system mount structure */
|
|
{
|
|
int error; /* error return value */
|
|
xfs_sb_t *sbp;
|
|
|
|
sbp = &mp->m_sb;
|
|
error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
|
|
if (xfs_metadata_is_sick(error))
|
|
xfs_rt_mark_sick(mp, XFS_SICK_RT_BITMAP);
|
|
if (error)
|
|
return error;
|
|
ASSERT(mp->m_rbmip != NULL);
|
|
|
|
error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP);
|
|
if (error)
|
|
goto out_rele_bitmap;
|
|
|
|
error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
|
|
if (xfs_metadata_is_sick(error))
|
|
xfs_rt_mark_sick(mp, XFS_SICK_RT_SUMMARY);
|
|
if (error)
|
|
goto out_rele_bitmap;
|
|
ASSERT(mp->m_rsumip != NULL);
|
|
|
|
error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM);
|
|
if (error)
|
|
goto out_rele_summary;
|
|
|
|
xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
|
|
return 0;
|
|
|
|
out_rele_summary:
|
|
xfs_irele(mp->m_rsumip);
|
|
out_rele_bitmap:
|
|
xfs_irele(mp->m_rbmip);
|
|
return error;
|
|
}
|
|
|
|
void
|
|
xfs_rtunmount_inodes(
|
|
struct xfs_mount *mp)
|
|
{
|
|
kvfree(mp->m_rsum_cache);
|
|
if (mp->m_rbmip)
|
|
xfs_irele(mp->m_rbmip);
|
|
if (mp->m_rsumip)
|
|
xfs_irele(mp->m_rsumip);
|
|
}
|
|
|
|
/*
|
|
* Pick an extent for allocation at the start of a new realtime file.
|
|
* Use the sequence number stored in the atime field of the bitmap inode.
|
|
* Translate this to a fraction of the rtextents, and return the product
|
|
* of rtextents and the fraction.
|
|
* The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
|
|
*/
|
|
static int
|
|
xfs_rtpick_extent(
|
|
xfs_mount_t *mp, /* file system mount point */
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_rtxlen_t len, /* allocation length (rtextents) */
|
|
xfs_rtxnum_t *pick) /* result rt extent */
|
|
{
|
|
xfs_rtxnum_t b; /* result rtext */
|
|
int log2; /* log of sequence number */
|
|
uint64_t resid; /* residual after log removed */
|
|
uint64_t seq; /* sequence number of file creation */
|
|
struct timespec64 ts; /* timespec in inode */
|
|
|
|
xfs_assert_ilocked(mp->m_rbmip, XFS_ILOCK_EXCL);
|
|
|
|
ts = inode_get_atime(VFS_I(mp->m_rbmip));
|
|
if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
|
|
mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
|
|
seq = 0;
|
|
} else {
|
|
seq = ts.tv_sec;
|
|
}
|
|
if ((log2 = xfs_highbit64(seq)) == -1)
|
|
b = 0;
|
|
else {
|
|
resid = seq - (1ULL << log2);
|
|
b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
|
|
(log2 + 1);
|
|
if (b >= mp->m_sb.sb_rextents)
|
|
div64_u64_rem(b, mp->m_sb.sb_rextents, &b);
|
|
if (b + len > mp->m_sb.sb_rextents)
|
|
b = mp->m_sb.sb_rextents - len;
|
|
}
|
|
ts.tv_sec = seq + 1;
|
|
inode_set_atime_to_ts(VFS_I(mp->m_rbmip), ts);
|
|
xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
|
|
*pick = b;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
xfs_rtalloc_align_minmax(
|
|
xfs_rtxlen_t *raminlen,
|
|
xfs_rtxlen_t *ramaxlen,
|
|
xfs_rtxlen_t *prod)
|
|
{
|
|
xfs_rtxlen_t newmaxlen = *ramaxlen;
|
|
xfs_rtxlen_t newminlen = *raminlen;
|
|
xfs_rtxlen_t slack;
|
|
|
|
slack = newmaxlen % *prod;
|
|
if (slack)
|
|
newmaxlen -= slack;
|
|
slack = newminlen % *prod;
|
|
if (slack)
|
|
newminlen += *prod - slack;
|
|
|
|
/*
|
|
* If adjusting for extent size hint alignment produces an invalid
|
|
* min/max len combination, go ahead without it.
|
|
*/
|
|
if (newmaxlen < newminlen) {
|
|
*prod = 1;
|
|
return;
|
|
}
|
|
*ramaxlen = newmaxlen;
|
|
*raminlen = newminlen;
|
|
}
|
|
|
|
int
|
|
xfs_bmap_rtalloc(
|
|
struct xfs_bmalloca *ap)
|
|
{
|
|
struct xfs_mount *mp = ap->ip->i_mount;
|
|
xfs_fileoff_t orig_offset = ap->offset;
|
|
xfs_rtxnum_t start; /* allocation hint rtextent no */
|
|
xfs_rtxnum_t rtx; /* actually allocated rtextent no */
|
|
xfs_rtxlen_t prod = 0; /* product factor for allocators */
|
|
xfs_extlen_t mod = 0; /* product factor for allocators */
|
|
xfs_rtxlen_t ralen = 0; /* realtime allocation length */
|
|
xfs_extlen_t align; /* minimum allocation alignment */
|
|
xfs_extlen_t orig_length = ap->length;
|
|
xfs_extlen_t minlen = mp->m_sb.sb_rextsize;
|
|
xfs_rtxlen_t raminlen;
|
|
bool rtlocked = false;
|
|
bool ignore_locality = false;
|
|
struct xfs_rtalloc_args args = {
|
|
.mp = mp,
|
|
.tp = ap->tp,
|
|
};
|
|
int error;
|
|
|
|
align = xfs_get_extsz_hint(ap->ip);
|
|
if (!align)
|
|
align = 1;
|
|
retry:
|
|
error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
|
|
align, 1, ap->eof, 0,
|
|
ap->conv, &ap->offset, &ap->length);
|
|
if (error)
|
|
return error;
|
|
ASSERT(ap->length);
|
|
ASSERT(xfs_extlen_to_rtxmod(mp, ap->length) == 0);
|
|
|
|
/*
|
|
* If we shifted the file offset downward to satisfy an extent size
|
|
* hint, increase minlen by that amount so that the allocator won't
|
|
* give us an allocation that's too short to cover at least one of the
|
|
* blocks that the caller asked for.
|
|
*/
|
|
if (ap->offset != orig_offset)
|
|
minlen += orig_offset - ap->offset;
|
|
|
|
/*
|
|
* Set ralen to be the actual requested length in rtextents.
|
|
*
|
|
* If the old value was close enough to XFS_BMBT_MAX_EXTLEN that
|
|
* we rounded up to it, cut it back so it's valid again.
|
|
* Note that if it's a really large request (bigger than
|
|
* XFS_BMBT_MAX_EXTLEN), we don't hear about that number, and can't
|
|
* adjust the starting point to match it.
|
|
*/
|
|
ralen = xfs_extlen_to_rtxlen(mp, min(ap->length, XFS_MAX_BMBT_EXTLEN));
|
|
raminlen = max_t(xfs_rtxlen_t, 1, xfs_extlen_to_rtxlen(mp, minlen));
|
|
ASSERT(raminlen > 0);
|
|
ASSERT(raminlen <= ralen);
|
|
|
|
/*
|
|
* Lock out modifications to both the RT bitmap and summary inodes
|
|
*/
|
|
if (!rtlocked) {
|
|
xfs_rtbitmap_lock(ap->tp, mp);
|
|
rtlocked = true;
|
|
}
|
|
|
|
if (ignore_locality) {
|
|
start = 0;
|
|
} else if (xfs_bmap_adjacent(ap)) {
|
|
start = xfs_rtb_to_rtx(mp, ap->blkno);
|
|
} else if (ap->eof && ap->offset == 0) {
|
|
/*
|
|
* If it's an allocation to an empty file at offset 0, pick an
|
|
* extent that will space things out in the rt area.
|
|
*/
|
|
error = xfs_rtpick_extent(mp, ap->tp, ralen, &start);
|
|
if (error)
|
|
return error;
|
|
} else {
|
|
start = 0;
|
|
}
|
|
|
|
/*
|
|
* Only bother calculating a real prod factor if offset & length are
|
|
* perfectly aligned, otherwise it will just get us in trouble.
|
|
*/
|
|
div_u64_rem(ap->offset, align, &mod);
|
|
if (mod || ap->length % align) {
|
|
prod = 1;
|
|
} else {
|
|
prod = xfs_extlen_to_rtxlen(mp, align);
|
|
if (prod > 1)
|
|
xfs_rtalloc_align_minmax(&raminlen, &ralen, &prod);
|
|
}
|
|
|
|
if (start) {
|
|
error = xfs_rtallocate_extent_near(&args, start, raminlen,
|
|
ralen, &ralen, prod, &rtx);
|
|
} else {
|
|
error = xfs_rtallocate_extent_size(&args, raminlen,
|
|
ralen, &ralen, prod, &rtx);
|
|
}
|
|
xfs_rtbuf_cache_relse(&args);
|
|
|
|
if (error == -ENOSPC) {
|
|
if (align > mp->m_sb.sb_rextsize) {
|
|
/*
|
|
* We previously enlarged the request length to try to
|
|
* satisfy an extent size hint. The allocator didn't
|
|
* return anything, so reset the parameters to the
|
|
* original values and try again without alignment
|
|
* criteria.
|
|
*/
|
|
ap->offset = orig_offset;
|
|
ap->length = orig_length;
|
|
minlen = align = mp->m_sb.sb_rextsize;
|
|
goto retry;
|
|
}
|
|
|
|
if (!ignore_locality && start != 0) {
|
|
/*
|
|
* If we can't allocate near a specific rt extent, try
|
|
* again without locality criteria.
|
|
*/
|
|
ignore_locality = true;
|
|
goto retry;
|
|
}
|
|
|
|
ap->blkno = NULLFSBLOCK;
|
|
ap->length = 0;
|
|
return 0;
|
|
}
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_trans_mod_sb(ap->tp, ap->wasdel ?
|
|
XFS_TRANS_SB_RES_FREXTENTS : XFS_TRANS_SB_FREXTENTS,
|
|
-(long)ralen);
|
|
ap->blkno = xfs_rtx_to_rtb(mp, rtx);
|
|
ap->length = xfs_rtxlen_to_extlen(mp, ralen);
|
|
xfs_bmap_alloc_account(ap);
|
|
return 0;
|
|
}
|