mirror of https://gitee.com/openkylin/linux.git
xfs: factor delalloc reservations out of xfs_bmapi
Move the reservation of delayed allocations, and addition of delalloc regions to the extent trees into a new helper function. For now this adds some twisted goto logic to xfs_bmapi, but that will be cleaned up in the following patches. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig
Alex Elder
parent
5b777ad517
commit
b64dfe4e18
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@ -4441,6 +4441,120 @@ xfs_bmapi_read(
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return 0;
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}
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STATIC int
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xfs_bmapi_reserve_delalloc(
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struct xfs_inode *ip,
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xfs_fileoff_t aoff,
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xfs_filblks_t len,
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struct xfs_bmbt_irec *got,
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struct xfs_bmbt_irec *prev,
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xfs_extnum_t *lastx,
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int eof)
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{
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
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xfs_extlen_t alen;
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xfs_extlen_t indlen;
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xfs_fsblock_t firstblock = NULLFSBLOCK;
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struct xfs_btree_cur *cur = NULL;
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int tmp_logflags = 0;
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char rt = XFS_IS_REALTIME_INODE(ip);
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xfs_extlen_t extsz;
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int error;
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alen = XFS_FILBLKS_MIN(len, MAXEXTLEN);
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if (!eof)
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alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
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/* Figure out the extent size, adjust alen */
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extsz = xfs_get_extsz_hint(ip);
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if (extsz) {
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/*
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* Make sure we don't exceed a single extent length when we
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* align the extent by reducing length we are going to
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* allocate by the maximum amount extent size aligment may
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* require.
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*/
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alen = XFS_FILBLKS_MIN(len, MAXEXTLEN - (2 * extsz - 1));
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error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof,
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1, 0, &aoff, &alen);
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ASSERT(!error);
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}
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if (rt)
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extsz = alen / mp->m_sb.sb_rextsize;
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/*
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* Make a transaction-less quota reservation for delayed allocation
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* blocks. This number gets adjusted later. We return if we haven't
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* allocated blocks already inside this loop.
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*/
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error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
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rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
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if (error)
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return error;
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/*
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* Split changing sb for alen and indlen since they could be coming
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* from different places.
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*/
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indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
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ASSERT(indlen > 0);
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if (rt) {
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error = xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
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-((int64_t)extsz), 0);
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} else {
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error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
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-((int64_t)alen), 0);
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}
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if (error)
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goto out_unreserve_quota;
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error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
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-((int64_t)indlen), 0);
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if (error)
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goto out_unreserve_blocks;
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ip->i_delayed_blks += alen;
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got->br_startoff = aoff;
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got->br_startblock = nullstartblock(indlen);
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got->br_blockcount = alen;
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got->br_state = XFS_EXT_NORM;
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error = xfs_bmap_add_extent(NULL, ip, lastx, &cur, got, &firstblock,
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NULL, &tmp_logflags, XFS_DATA_FORK);
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ASSERT(!error);
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ASSERT(!tmp_logflags);
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ASSERT(!cur);
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/*
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* Update our extent pointer, given that xfs_bmap_add_extent might
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* have merged it into one of the neighbouring ones.
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*/
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xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got);
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ASSERT(got->br_startoff <= aoff);
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ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen);
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ASSERT(isnullstartblock(got->br_startblock));
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ASSERT(got->br_state == XFS_EXT_NORM);
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return 0;
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out_unreserve_blocks:
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if (rt)
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xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS, extsz, 0);
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else
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xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, alen, 0);
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out_unreserve_quota:
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if (XFS_IS_QUOTA_ON(mp))
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xfs_trans_unreserve_quota_nblks(NULL, ip, alen, 0, rt ?
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XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
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return error;
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}
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/*
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* Map file blocks to filesystem blocks.
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* File range is given by the bno/len pair.
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@ -4479,7 +4593,6 @@ xfs_bmapi(
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int error; /* error return */
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xfs_bmbt_irec_t got; /* current file extent record */
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xfs_ifork_t *ifp; /* inode fork pointer */
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xfs_extlen_t indlen; /* indirect blocks length */
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xfs_extnum_t lastx; /* last useful extent number */
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int logflags; /* flags for transaction logging */
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xfs_extlen_t minleft; /* min blocks left after allocation */
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@ -4615,43 +4728,8 @@ xfs_bmapi(
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}
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minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1;
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if (flags & XFS_BMAPI_DELAY) {
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xfs_extlen_t extsz;
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/* Figure out the extent size, adjust alen */
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extsz = xfs_get_extsz_hint(ip);
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if (extsz) {
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/*
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* make sure we don't exceed a single
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* extent length when we align the
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* extent by reducing length we are
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* going to allocate by the maximum
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* amount extent size aligment may
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* require.
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*/
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alen = XFS_FILBLKS_MIN(len,
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MAXEXTLEN - (2 * extsz - 1));
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error = xfs_bmap_extsize_align(mp,
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&got, &prev, extsz,
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rt, eof,
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flags&XFS_BMAPI_DELAY,
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flags&XFS_BMAPI_CONVERT,
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&aoff, &alen);
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ASSERT(!error);
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}
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if (rt)
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extsz = alen / mp->m_sb.sb_rextsize;
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/*
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* Make a transaction-less quota reservation for
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* delayed allocation blocks. This number gets
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* adjusted later. We return if we haven't
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* allocated blocks already inside this loop.
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*/
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error = xfs_trans_reserve_quota_nblks(
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NULL, ip, (long)alen, 0,
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rt ? XFS_QMOPT_RES_RTBLKS :
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XFS_QMOPT_RES_REGBLKS);
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error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
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&prev, &lastx, eof);
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if (error) {
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if (n == 0) {
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*nmap = 0;
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@ -4661,51 +4739,7 @@ xfs_bmapi(
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break;
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}
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/*
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* Split changing sb for alen and indlen since
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* they could be coming from different places.
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*/
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indlen = (xfs_extlen_t)
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xfs_bmap_worst_indlen(ip, alen);
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ASSERT(indlen > 0);
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if (rt) {
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error = xfs_mod_incore_sb(mp,
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XFS_SBS_FREXTENTS,
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-((int64_t)extsz), 0);
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} else {
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error = xfs_icsb_modify_counters(mp,
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XFS_SBS_FDBLOCKS,
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-((int64_t)alen), 0);
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}
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if (!error) {
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error = xfs_icsb_modify_counters(mp,
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XFS_SBS_FDBLOCKS,
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-((int64_t)indlen), 0);
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if (error && rt)
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xfs_mod_incore_sb(mp,
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XFS_SBS_FREXTENTS,
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(int64_t)extsz, 0);
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else if (error)
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xfs_icsb_modify_counters(mp,
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XFS_SBS_FDBLOCKS,
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(int64_t)alen, 0);
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}
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if (error) {
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if (XFS_IS_QUOTA_ON(mp))
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/* unreserve the blocks now */
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(void)
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xfs_trans_unreserve_quota_nblks(
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NULL, ip,
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(long)alen, 0, rt ?
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XFS_QMOPT_RES_RTBLKS :
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XFS_QMOPT_RES_REGBLKS);
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break;
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}
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ip->i_delayed_blks += alen;
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abno = nullstartblock(indlen);
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goto trim_extent;
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} else {
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/*
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* If first time, allocate and fill in
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@ -4843,7 +4877,7 @@ xfs_bmapi(
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n++;
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continue;
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}
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trim_extent:
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/* Deal with the allocated space we found. */
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xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
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