[Cluster-devel] [PATCH 06/11] gfs2: Only use struct gfs2_rbm for bitmap manipulations
Steven Whitehouse
swhiteho at redhat.com
Mon Oct 8 10:39:33 UTC 2018
Hi,
On 05/10/18 20:18, Andreas Gruenbacher wrote:
> GFS2 uses struct gfs2_rbm to represent a filesystem block number as a
> bit position within a resource group. This representation is used in
> the bitmap manipulation code to prevent excessive conversions between
> block numbers and bit positions, but also in struct gfs2_blkreserv which
> is part of struct gfs2_inode, to mark the start of a reservation. In
> the inode, the bit position representation makes less sense: first, the
> start position is used as a block number about as often as a bit
> position; second, the bit position representation makes the code
> unnecessarily difficult to read.
>
> Therefore, change struct gfs2_blkreserv to represent the start of a
> reservation as a block number instead of a bit position. (This requires
> keeping track of the resource group in gfs2_blkreserv separately.) With
> that change, various things can be slightly simplified, and struct
> gfs2_rbm can be moved to rgrp.c.
Bear in mind that conversion from block number to rbm format is a much
more expensive operation than conversion from rbm format to a block
number. So the code is written to reduce the number of conversions from
block to rbm as much as possible. I'm not sure that this change is
actually getting us anything useful here,
Steve.
>
> Signed-off-by: Andreas Gruenbacher <agruenba at redhat.com>
> ---
> fs/gfs2/bmap.c | 2 +-
> fs/gfs2/incore.h | 30 +--------
> fs/gfs2/rgrp.c | 156 ++++++++++++++++++++++++++-----------------
> fs/gfs2/trace_gfs2.h | 10 +--
> fs/gfs2/trans.h | 2 +-
> 5 files changed, 103 insertions(+), 97 deletions(-)
>
> diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
> index 03128ed1f34e..c192906bb5f6 100644
> --- a/fs/gfs2/bmap.c
> +++ b/fs/gfs2/bmap.c
> @@ -1503,7 +1503,7 @@ static int sweep_bh_for_rgrps(struct gfs2_inode *ip, struct gfs2_holder *rd_gh,
>
> /* Must be done with the rgrp glock held: */
> if (gfs2_rs_active(&ip->i_res) &&
> - rgd == ip->i_res.rs_rbm.rgd)
> + rgd == ip->i_res.rs_rgd)
> gfs2_rs_deltree(&ip->i_res);
> }
>
> diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
> index a1771d8a93be..0ed28fbc73b4 100644
> --- a/fs/gfs2/incore.h
> +++ b/fs/gfs2/incore.h
> @@ -124,31 +124,6 @@ struct gfs2_rgrpd {
> struct rb_root rd_rstree; /* multi-block reservation tree */
> };
>
> -struct gfs2_rbm {
> - struct gfs2_rgrpd *rgd;
> - u32 offset; /* The offset is bitmap relative */
> - int bii; /* Bitmap index */
> -};
> -
> -static inline struct gfs2_bitmap *rbm_bi(const struct gfs2_rbm *rbm)
> -{
> - return rbm->rgd->rd_bits + rbm->bii;
> -}
> -
> -static inline u64 gfs2_rbm_to_block(const struct gfs2_rbm *rbm)
> -{
> - BUG_ON(rbm->offset >= rbm->rgd->rd_data);
> - return rbm->rgd->rd_data0 + (rbm_bi(rbm)->bi_start * GFS2_NBBY) +
> - rbm->offset;
> -}
> -
> -static inline bool gfs2_rbm_eq(const struct gfs2_rbm *rbm1,
> - const struct gfs2_rbm *rbm2)
> -{
> - return (rbm1->rgd == rbm2->rgd) && (rbm1->bii == rbm2->bii) &&
> - (rbm1->offset == rbm2->offset);
> -}
> -
> enum gfs2_state_bits {
> BH_Pinned = BH_PrivateStart,
> BH_Escaped = BH_PrivateStart + 1,
> @@ -309,8 +284,9 @@ struct gfs2_qadata { /* quota allocation data */
> */
>
> struct gfs2_blkreserv {
> - struct rb_node rs_node; /* link to other block reservations */
> - struct gfs2_rbm rs_rbm; /* Start of reservation */
> + struct rb_node rs_node; /* node within rd_rstree */
> + struct gfs2_rgrpd *rs_rgd;
> + u64 rs_start; /* start of reservation */
> u32 rs_free; /* how many blocks are still free */
> };
>
> diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
> index 070ad493a4ec..ee6ea7d8cf44 100644
> --- a/fs/gfs2/rgrp.c
> +++ b/fs/gfs2/rgrp.c
> @@ -49,6 +49,24 @@
> #define LBITSKIP00 (0x0000000000000000UL)
> #endif
>
> +struct gfs2_rbm {
> + struct gfs2_rgrpd *rgd;
> + u32 offset; /* The offset is bitmap relative */
> + int bii; /* Bitmap index */
> +};
> +
> +static inline struct gfs2_bitmap *rbm_bi(const struct gfs2_rbm *rbm)
> +{
> + return rbm->rgd->rd_bits + rbm->bii;
> +}
> +
> +static inline u64 gfs2_rbm_to_block(const struct gfs2_rbm *rbm)
> +{
> + BUG_ON(rbm->offset >= rbm->rgd->rd_data);
> + return rbm->rgd->rd_data0 + (rbm_bi(rbm)->bi_start * GFS2_NBBY) +
> + rbm->offset;
> +}
> +
> /*
> * These routines are used by the resource group routines (rgrp.c)
> * to keep track of block allocation. Each block is represented by two
> @@ -184,7 +202,7 @@ static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
>
> /**
> * rs_cmp - multi-block reservation range compare
> - * @blk: absolute file system block number of the new reservation
> + * @start: start of the new reservation
> * @len: number of blocks in the new reservation
> * @rs: existing reservation to compare against
> *
> @@ -192,13 +210,11 @@ static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
> * -1 if the block range is before the start of the reservation
> * 0 if the block range overlaps with the reservation
> */
> -static inline int rs_cmp(u64 blk, u32 len, struct gfs2_blkreserv *rs)
> +static inline int rs_cmp(u64 start, u32 len, struct gfs2_blkreserv *rs)
> {
> - u64 startblk = gfs2_rbm_to_block(&rs->rs_rbm);
> -
> - if (blk >= startblk + rs->rs_free)
> + if (start >= rs->rs_start + rs->rs_free)
> return 1;
> - if (blk + len - 1 < startblk)
> + if (rs->rs_start >= start + len)
> return -1;
> return 0;
> }
> @@ -269,12 +285,11 @@ static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
>
> static int gfs2_rbm_from_block(struct gfs2_rbm *rbm, u64 block)
> {
> - u64 rblock = block - rbm->rgd->rd_data0;
> + u64 rblock;
>
> - if (WARN_ON_ONCE(rblock > UINT_MAX))
> - return -EINVAL;
> - if (block >= rbm->rgd->rd_data0 + rbm->rgd->rd_data)
> + if (!rgrp_contains_block(rbm->rgd, block))
> return -E2BIG;
> + rblock = block - rbm->rgd->rd_data0;
>
> rbm->bii = 0;
> rbm->offset = (u32)(rblock);
> @@ -316,13 +331,28 @@ static bool gfs2_rbm_incr(struct gfs2_rbm *rbm)
> return false;
> }
>
> +static struct gfs2_bitmap *gfs2_block_to_bitmap(struct gfs2_rgrpd *rgd,
> + u64 block)
> +{
> + unsigned int delta = (sizeof(struct gfs2_rgrp) -
> + sizeof(struct gfs2_meta_header)) * GFS2_NBBY;
> + unsigned int rblock, bii;
> +
> + if (!rgrp_contains_block(rgd, block))
> + return NULL;
> + rblock = block - rgd->rd_data0;
> + bii = (rblock + delta) / rgd->rd_sbd->sd_blocks_per_bitmap;
> + return rgd->rd_bits + bii;
> +}
> +
> /**
> * gfs2_unaligned_extlen - Look for free blocks which are not byte aligned
> * @rbm: Position to search (value/result)
> * @n_unaligned: Number of unaligned blocks to check
> * @len: Decremented for each block found (terminate on zero)
> *
> - * Returns: true if a non-free block is encountered
> + * Returns: true if a non-free block is encountered or the end of the resource
> + * group is reached.
> */
>
> static bool gfs2_unaligned_extlen(struct gfs2_rbm *rbm, u32 n_unaligned, u32 *len)
> @@ -618,10 +648,10 @@ static void dump_rs(struct seq_file *seq, const struct gfs2_blkreserv *rs)
> {
> struct gfs2_inode *ip = container_of(rs, struct gfs2_inode, i_res);
>
> - gfs2_print_dbg(seq, " B: n:%llu s:%llu b:%u f:%u\n",
> + gfs2_print_dbg(seq, " B: n:%llu s:%llu f:%u\n",
> (unsigned long long)ip->i_no_addr,
> - (unsigned long long)gfs2_rbm_to_block(&rs->rs_rbm),
> - rs->rs_rbm.offset, rs->rs_free);
> + (unsigned long long)rs->rs_start,
> + rs->rs_free);
> }
>
> /**
> @@ -636,24 +666,26 @@ static void __rs_deltree(struct gfs2_blkreserv *rs)
> if (!gfs2_rs_active(rs))
> return;
>
> - rgd = rs->rs_rbm.rgd;
> + rgd = rs->rs_rgd;
> trace_gfs2_rs(rs, TRACE_RS_TREEDEL);
> rb_erase(&rs->rs_node, &rgd->rd_rstree);
> RB_CLEAR_NODE(&rs->rs_node);
>
> if (rs->rs_free) {
> - struct gfs2_bitmap *bi = rbm_bi(&rs->rs_rbm);
> + struct gfs2_bitmap *bi;
>
> /* return reserved blocks to the rgrp */
> - BUG_ON(rs->rs_rbm.rgd->rd_reserved < rs->rs_free);
> - rs->rs_rbm.rgd->rd_reserved -= rs->rs_free;
> + BUG_ON(rs->rs_rgd->rd_reserved < rs->rs_free);
> + rs->rs_rgd->rd_reserved -= rs->rs_free;
> /* The rgrp extent failure point is likely not to increase;
> it will only do so if the freed blocks are somehow
> contiguous with a span of free blocks that follows. Still,
> it will force the number to be recalculated later. */
> rgd->rd_extfail_pt += rs->rs_free;
> rs->rs_free = 0;
> - clear_bit(GBF_FULL, &bi->bi_flags);
> + bi = gfs2_block_to_bitmap(rgd, rs->rs_start);
> + if (bi)
> + clear_bit(GBF_FULL, &bi->bi_flags);
> }
> }
>
> @@ -666,7 +698,7 @@ void gfs2_rs_deltree(struct gfs2_blkreserv *rs)
> {
> struct gfs2_rgrpd *rgd;
>
> - rgd = rs->rs_rbm.rgd;
> + rgd = rs->rs_rgd;
> if (rgd) {
> spin_lock(&rgd->rd_rsspin);
> __rs_deltree(rs);
> @@ -1481,8 +1513,7 @@ static void rs_insert(struct gfs2_inode *ip)
> struct rb_node **newn, *parent = NULL;
> int rc;
> struct gfs2_blkreserv *rs = &ip->i_res;
> - struct gfs2_rgrpd *rgd = rs->rs_rbm.rgd;
> - u64 fsblock = gfs2_rbm_to_block(&rs->rs_rbm);
> + struct gfs2_rgrpd *rgd = rs->rs_rgd;
>
> BUG_ON(gfs2_rs_active(rs));
>
> @@ -1493,7 +1524,7 @@ static void rs_insert(struct gfs2_inode *ip)
> rb_entry(*newn, struct gfs2_blkreserv, rs_node);
>
> parent = *newn;
> - rc = rs_cmp(fsblock, rs->rs_free, cur);
> + rc = rs_cmp(rs->rs_start, rs->rs_free, cur);
> if (rc > 0)
> newn = &((*newn)->rb_right);
> else if (rc < 0)
> @@ -1581,7 +1612,7 @@ static void rg_mblk_search(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip,
>
> ret = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, &extlen, ip, true);
> if (ret == 0) {
> - rs->rs_rbm = rbm;
> + rs->rs_start = gfs2_rbm_to_block(&rbm);
> rs->rs_free = extlen;
> rs_insert(ip);
> } else {
> @@ -1626,7 +1657,7 @@ static u64 gfs2_next_unreserved_block(struct gfs2_rgrpd *rgd, u64 block,
>
> if (n) {
> while ((rs_cmp(block, length, rs) == 0) && (&ip->i_res != rs)) {
> - block = gfs2_rbm_to_block(&rs->rs_rbm) + rs->rs_free;
> + block = rs->rs_start + rs->rs_free;
> n = n->rb_right;
> if (n == NULL)
> break;
> @@ -1967,7 +1998,7 @@ static bool gfs2_rgrp_used_recently(const struct gfs2_blkreserv *rs,
> u64 tdiff;
>
> tdiff = ktime_to_ns(ktime_sub(ktime_get_real(),
> - rs->rs_rbm.rgd->rd_gl->gl_dstamp));
> + rs->rs_rgd->rd_gl->gl_dstamp));
>
> return tdiff > (msecs * 1000 * 1000);
> }
> @@ -2045,45 +2076,45 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
> if (gfs2_assert_warn(sdp, ap->target))
> return -EINVAL;
> if (gfs2_rs_active(rs)) {
> - begin = rs->rs_rbm.rgd;
> - } else if (rs->rs_rbm.rgd &&
> - rgrp_contains_block(rs->rs_rbm.rgd, ip->i_goal)) {
> - begin = rs->rs_rbm.rgd;
> + begin = rs->rs_rgd;
> + } else if (rs->rs_rgd &&
> + rgrp_contains_block(rs->rs_rgd, ip->i_goal)) {
> + begin = rs->rs_rgd;
> } else {
> check_and_update_goal(ip);
> - rs->rs_rbm.rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
> + rs->rs_rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
> }
> if (S_ISDIR(ip->i_inode.i_mode) && (ap->aflags & GFS2_AF_ORLOV))
> skip = gfs2_orlov_skip(ip);
> - if (rs->rs_rbm.rgd == NULL)
> + if (rs->rs_rgd == NULL)
> return -EBADSLT;
>
> while (loops < 3) {
> rg_locked = 1;
>
> - if (!gfs2_glock_is_locked_by_me(rs->rs_rbm.rgd->rd_gl)) {
> + if (!gfs2_glock_is_locked_by_me(rs->rs_rgd->rd_gl)) {
> rg_locked = 0;
> if (skip && skip--)
> goto next_rgrp;
> if (!gfs2_rs_active(rs)) {
> if (loops == 0 &&
> - !fast_to_acquire(rs->rs_rbm.rgd))
> + !fast_to_acquire(rs->rs_rgd))
> goto next_rgrp;
> if ((loops < 2) &&
> gfs2_rgrp_used_recently(rs, 1000) &&
> - gfs2_rgrp_congested(rs->rs_rbm.rgd, loops))
> + gfs2_rgrp_congested(rs->rs_rgd, loops))
> goto next_rgrp;
> }
> - error = gfs2_glock_nq_init(rs->rs_rbm.rgd->rd_gl,
> + error = gfs2_glock_nq_init(rs->rs_rgd->rd_gl,
> LM_ST_EXCLUSIVE, flags,
> &ip->i_rgd_gh);
> if (unlikely(error))
> return error;
> if (!gfs2_rs_active(rs) && (loops < 2) &&
> - gfs2_rgrp_congested(rs->rs_rbm.rgd, loops))
> + gfs2_rgrp_congested(rs->rs_rgd, loops))
> goto skip_rgrp;
> if (sdp->sd_args.ar_rgrplvb) {
> - error = update_rgrp_lvb(rs->rs_rbm.rgd);
> + error = update_rgrp_lvb(rs->rs_rgd);
> if (unlikely(error)) {
> gfs2_glock_dq_uninit(&ip->i_rgd_gh);
> return error;
> @@ -2092,24 +2123,24 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
> }
>
> /* Skip unusable resource groups */
> - if ((rs->rs_rbm.rgd->rd_flags & (GFS2_RGF_NOALLOC |
> + if ((rs->rs_rgd->rd_flags & (GFS2_RGF_NOALLOC |
> GFS2_RDF_ERROR)) ||
> - (loops == 0 && ap->target > rs->rs_rbm.rgd->rd_extfail_pt))
> + (loops == 0 && ap->target > rs->rs_rgd->rd_extfail_pt))
> goto skip_rgrp;
>
> if (sdp->sd_args.ar_rgrplvb)
> - gfs2_rgrp_bh_get(rs->rs_rbm.rgd);
> + gfs2_rgrp_bh_get(rs->rs_rgd);
>
> /* Get a reservation if we don't already have one */
> if (!gfs2_rs_active(rs))
> - rg_mblk_search(rs->rs_rbm.rgd, ip, ap);
> + rg_mblk_search(rs->rs_rgd, ip, ap);
>
> /* Skip rgrps when we can't get a reservation on first pass */
> if (!gfs2_rs_active(rs) && (loops < 1))
> goto check_rgrp;
>
> /* If rgrp has enough free space, use it */
> - free_blocks = rgd_free(rs->rs_rbm.rgd, rs);
> + free_blocks = rgd_free(rs->rs_rgd, rs);
> if (free_blocks >= ap->target ||
> (loops == 2 && ap->min_target &&
> free_blocks >= ap->min_target)) {
> @@ -2118,8 +2149,8 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
> }
> check_rgrp:
> /* Check for unlinked inodes which can be reclaimed */
> - if (rs->rs_rbm.rgd->rd_flags & GFS2_RDF_CHECK)
> - try_rgrp_unlink(rs->rs_rbm.rgd, &last_unlinked,
> + if (rs->rs_rgd->rd_flags & GFS2_RDF_CHECK)
> + try_rgrp_unlink(rs->rs_rgd, &last_unlinked,
> ip->i_no_addr);
> skip_rgrp:
> /* Drop reservation, if we couldn't use reserved rgrp */
> @@ -2131,7 +2162,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
> gfs2_glock_dq_uninit(&ip->i_rgd_gh);
> next_rgrp:
> /* Find the next rgrp, and continue looking */
> - if (gfs2_select_rgrp(&rs->rs_rbm.rgd, begin))
> + if (gfs2_select_rgrp(&rs->rs_rgd, begin))
> continue;
> if (skip)
> continue;
> @@ -2307,20 +2338,21 @@ static void gfs2_adjust_reservation(struct gfs2_inode *ip,
> {
> struct gfs2_blkreserv *rs = &ip->i_res;
> struct gfs2_rgrpd *rgd = rbm->rgd;
> - unsigned rlen;
> - u64 block;
> - int ret;
>
> spin_lock(&rgd->rd_rsspin);
> if (gfs2_rs_active(rs)) {
> - if (gfs2_rbm_eq(&rs->rs_rbm, rbm)) {
> - block = gfs2_rbm_to_block(rbm);
> - ret = gfs2_rbm_from_block(&rs->rs_rbm, block + len);
> + u64 start = gfs2_rbm_to_block(rbm);
> +
> + if (rs->rs_start == start) {
> + unsigned int rlen;
> +
> + rs->rs_start += len;
> rlen = min(rs->rs_free, len);
> rs->rs_free -= rlen;
> rgd->rd_reserved -= rlen;
> trace_gfs2_rs(rs, TRACE_RS_CLAIM);
> - if (rs->rs_free && !ret)
> + if (rs->rs_start < rgd->rd_data0 + rgd->rd_data &&
> + rs->rs_free)
> goto out;
> /* We used up our block reservation, so we should
> reserve more blocks next time. */
> @@ -2349,15 +2381,13 @@ static void gfs2_set_alloc_start(struct gfs2_rbm *rbm,
> u64 goal;
>
> if (gfs2_rs_active(&ip->i_res)) {
> - *rbm = ip->i_res.rs_rbm;
> - return;
> + goal = ip->i_res.rs_start;
> + } else {
> + if (!dinode && rgrp_contains_block(rbm->rgd, ip->i_goal))
> + goal = ip->i_goal;
> + else
> + goal = rbm->rgd->rd_last_alloc + rbm->rgd->rd_data0;
> }
> -
> - if (!dinode && rgrp_contains_block(rbm->rgd, ip->i_goal))
> - goal = ip->i_goal;
> - else
> - goal = rbm->rgd->rd_last_alloc + rbm->rgd->rd_data0;
> -
> BUG_ON(gfs2_rbm_from_block(rbm, goal));
> }
>
> @@ -2377,7 +2407,7 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
> {
> struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
> struct buffer_head *dibh;
> - struct gfs2_rbm rbm = { .rgd = ip->i_res.rs_rbm.rgd, };
> + struct gfs2_rbm rbm = { .rgd = ip->i_res.rs_rgd, };
> unsigned int ndata;
> u64 block; /* block, within the file system scope */
> int error;
> @@ -2612,7 +2642,7 @@ void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
> return;
> rgd = gfs2_blk2rgrpd(sdp, block, 1);
> } else {
> - rgd = ip->i_res.rs_rbm.rgd;
> + rgd = ip->i_res.rs_rgd;
> if (!rgd || !rgrp_contains_block(rgd, block))
> rgd = gfs2_blk2rgrpd(sdp, block, 1);
> }
> diff --git a/fs/gfs2/trace_gfs2.h b/fs/gfs2/trace_gfs2.h
> index e0025258107a..7586c7629497 100644
> --- a/fs/gfs2/trace_gfs2.h
> +++ b/fs/gfs2/trace_gfs2.h
> @@ -602,13 +602,13 @@ TRACE_EVENT(gfs2_rs,
> ),
>
> TP_fast_assign(
> - __entry->dev = rs->rs_rbm.rgd->rd_sbd->sd_vfs->s_dev;
> - __entry->rd_addr = rs->rs_rbm.rgd->rd_addr;
> - __entry->rd_free_clone = rs->rs_rbm.rgd->rd_free_clone;
> - __entry->rd_reserved = rs->rs_rbm.rgd->rd_reserved;
> + __entry->dev = rs->rs_rgd->rd_sbd->sd_vfs->s_dev;
> + __entry->rd_addr = rs->rs_rgd->rd_addr;
> + __entry->rd_free_clone = rs->rs_rgd->rd_free_clone;
> + __entry->rd_reserved = rs->rs_rgd->rd_reserved;
> __entry->inum = container_of(rs, struct gfs2_inode,
> i_res)->i_no_addr;
> - __entry->start = gfs2_rbm_to_block(&rs->rs_rbm);
> + __entry->start = rs->rs_start;
> __entry->free = rs->rs_free;
> __entry->func = func;
> ),
> diff --git a/fs/gfs2/trans.h b/fs/gfs2/trans.h
> index ad70087d0597..a27078f98e7a 100644
> --- a/fs/gfs2/trans.h
> +++ b/fs/gfs2/trans.h
> @@ -30,7 +30,7 @@ struct gfs2_glock;
> * block, or all of the blocks in the rg, whichever is smaller */
> static inline unsigned int gfs2_rg_blocks(const struct gfs2_inode *ip, unsigned requested)
> {
> - struct gfs2_rgrpd *rgd = ip->i_res.rs_rbm.rgd;
> + struct gfs2_rgrpd *rgd = ip->i_res.rs_rgd;
>
> if (requested < rgd->rd_length)
> return requested + 1;
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