Commit 9763dd6f authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'gfs2-4.11.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2 

Pull GFS2 updates from Robert Peterson:
 "We've got eight GFS2 patches for this merge window:

   - Andy Price submitted a patch to make gfs2_write_full_page a static
     function.

   - Dan Carpenter submitted a patch to fix a ERR_PTR thinko.

  Three patches fix bugs related to deleting very large files, which
  cause GFS2 to run out of journal space:

   - The first one prevents GFS2 delete operation from requesting too
     much journal space.

   - The second one fixes a problem whereby GFS2 can hang because it
     wasn't taking journal space demand into its calculations.

   - The third one wakes up IO waiters when a flush is done to restart
     processes stuck waiting for journal space to become available.

  The final three patches are a performance improvement related to
  spin_lock contention between multiple writers:

   - The "tr_touched" variable was switched to a flag to be more atomic
     and eliminate the possibility of some races.

   - Function meta_lo_add was moved inline with its only caller to make
     the code more readable and efficient.

   - Contention on the gfs2_log_lock spinlock was greatly reduced by
     avoiding the lock altogether in cases where we don't really need
     it: buffers that already appear in the appropriate metadata list
     for the journal. Many thanks to Steve Whitehouse for the ideas and
     principles behind these patches"

* tag 'gfs2-4.11.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Make gfs2_write_full_page static
  GFS2: Reduce contention on gfs2_log_lock
  GFS2: Inline function meta_lo_add
  GFS2: Switch tr_touched to flag in transaction
  GFS2: Wake up io waiters whenever a flush is done
  GFS2: Made logd daemon take into account log demand
  GFS2: Limit number of transaction blocks requested for truncates
  GFS2: Fix reference to ERR_PTR in gfs2_glock_iter_next
parents 70fcf5c3 c548a1c1

fs/gfs2/aops.c

+2 −2
Original line number Diff line number Diff line
@@ -143,7 +143,7 @@ static int gfs2_writepage(struct page *page, struct writeback_control *wbc) 
/* This is the same as calling block_write_full_page, but it also

 * writes pages outside of i_size

 */

int gfs2_write_full_page(struct page *page, get_block_t *get_block,

static int gfs2_write_full_page(struct page *page, get_block_t *get_block,

				struct writeback_control *wbc)

{

	struct inode * const inode = page->mapping->host;

fs/gfs2/bmap.c

+26 −3
Original line number Diff line number Diff line
@@ -720,6 +720,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, 
{

	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);

	struct gfs2_rgrp_list rlist;

	struct gfs2_trans *tr;

	u64 bn, bstart;

	u32 blen, btotal;

	__be64 *p;
@@ -728,6 +729,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, 
	unsigned int revokes = 0;

	int x;

	int error;

	int jblocks_rqsted;



	error = gfs2_rindex_update(sdp);

	if (error)
@@ -791,12 +793,17 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, 
	if (gfs2_rs_active(&ip->i_res)) /* needs to be done with the rgrp glock held */

		gfs2_rs_deltree(&ip->i_res);



	error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +

				 RES_INDIRECT + RES_STATFS + RES_QUOTA,

				 revokes);

restart:

	jblocks_rqsted = rg_blocks + RES_DINODE +

		RES_INDIRECT + RES_STATFS + RES_QUOTA +

		gfs2_struct2blk(sdp, revokes, sizeof(u64));

	if (jblocks_rqsted > atomic_read(&sdp->sd_log_thresh2))

		jblocks_rqsted = atomic_read(&sdp->sd_log_thresh2);

	error = gfs2_trans_begin(sdp, jblocks_rqsted, revokes);

	if (error)

		goto out_rg_gunlock;



	tr = current->journal_info;

	down_write(&ip->i_rw_mutex);



	gfs2_trans_add_meta(ip->i_gl, dibh);
@@ -810,6 +817,16 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, 
		if (!*p)

			continue;



		/* check for max reasonable journal transaction blocks */

		if (tr->tr_num_buf_new + RES_STATFS +

		    RES_QUOTA >= atomic_read(&sdp->sd_log_thresh2)) {

			if (rg_blocks >= tr->tr_num_buf_new)

				rg_blocks -= tr->tr_num_buf_new;

			else

				rg_blocks = 0;

			break;

		}



		bn = be64_to_cpu(*p);



		if (bstart + blen == bn)
@@ -827,6 +844,9 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, 
		*p = 0;

		gfs2_add_inode_blocks(&ip->i_inode, -1);

	}

	if (p == bottom)

		rg_blocks = 0;



	if (bstart) {

		__gfs2_free_blocks(ip, bstart, blen, metadata);

		btotal += blen;
@@ -844,6 +864,9 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, 


	gfs2_trans_end(sdp);



	if (rg_blocks)

		goto restart;



out_rg_gunlock:

	gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);

out_rlist:

fs/gfs2/glock.c

+7 −5
Original line number Diff line number Diff line
@@ -1802,16 +1802,18 @@ void gfs2_glock_exit(void) 


static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi)

{

	do {

		gi->gl = rhashtable_walk_next(&gi->hti);

	while ((gi->gl = rhashtable_walk_next(&gi->hti))) {

		if (IS_ERR(gi->gl)) {

			if (PTR_ERR(gi->gl) == -EAGAIN)

				continue;

			gi->gl = NULL;

			return;

		}

		/* Skip entries for other sb and dead entries */

	} while ((gi->gl) && ((gi->sdp != gi->gl->gl_name.ln_sbd) ||

			      __lockref_is_dead(&gi->gl->gl_lockref)));

		if (gi->sdp == gi->gl->gl_name.ln_sbd &&

		    !__lockref_is_dead(&gi->gl->gl_lockref))

			return;

	}

}



static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)

fs/gfs2/incore.h

+8 −3
Original line number Diff line number Diff line
@@ -470,15 +470,19 @@ struct gfs2_quota_data { 
	struct rcu_head qd_rcu;

};



enum {

	TR_TOUCHED = 1,

	TR_ATTACHED = 2,

	TR_ALLOCED = 3,

};



struct gfs2_trans {

	unsigned long tr_ip;



	unsigned int tr_blocks;

	unsigned int tr_revokes;

	unsigned int tr_reserved;

	unsigned int tr_touched:1;

	unsigned int tr_attached:1;

	unsigned int tr_alloced:1;

	unsigned long tr_flags;



	unsigned int tr_num_buf_new;

	unsigned int tr_num_databuf_new;
@@ -794,6 +798,7 @@ struct gfs2_sbd { 
	atomic_t sd_log_thresh1;

	atomic_t sd_log_thresh2;

	atomic_t sd_log_blks_free;

	atomic_t sd_log_blks_needed;

	wait_queue_head_t sd_log_waitq;

	wait_queue_head_t sd_logd_waitq;

fs/gfs2/log.c

+15 −6
Original line number Diff line number Diff line
@@ -349,6 +349,7 @@ int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) 
	if (gfs2_assert_warn(sdp, blks) ||

	    gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))

		return -EINVAL;

	atomic_add(blks, &sdp->sd_log_blks_needed);

retry:

	free_blocks = atomic_read(&sdp->sd_log_blks_free);

	if (unlikely(free_blocks <= wanted)) {
@@ -370,6 +371,7 @@ retry: 
			wake_up(&sdp->sd_reserving_log_wait);

		goto retry;

	}

	atomic_sub(blks, &sdp->sd_log_blks_needed);

	trace_gfs2_log_blocks(sdp, -blks);



	/*
@@ -797,7 +799,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, 


static void gfs2_merge_trans(struct gfs2_trans *old, struct gfs2_trans *new)

{

	WARN_ON_ONCE(old->tr_attached != 1);

	WARN_ON_ONCE(!test_bit(TR_ATTACHED, &old->tr_flags));



	old->tr_num_buf_new	+= new->tr_num_buf_new;

	old->tr_num_databuf_new	+= new->tr_num_databuf_new;
@@ -821,9 +823,9 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 
	if (sdp->sd_log_tr) {

		gfs2_merge_trans(sdp->sd_log_tr, tr);

	} else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) {

		gfs2_assert_withdraw(sdp, tr->tr_alloced);

		gfs2_assert_withdraw(sdp, test_bit(TR_ALLOCED, &tr->tr_flags));

		sdp->sd_log_tr = tr;

		tr->tr_attached = 1;

		set_bit(TR_ATTACHED, &tr->tr_flags);

	}



	sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
@@ -891,13 +893,16 @@ void gfs2_log_shutdown(struct gfs2_sbd *sdp) 


static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)

{

	return (atomic_read(&sdp->sd_log_pinned) >= atomic_read(&sdp->sd_log_thresh1));

	return (atomic_read(&sdp->sd_log_pinned) +

		atomic_read(&sdp->sd_log_blks_needed) >=

		atomic_read(&sdp->sd_log_thresh1));

}



static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)

{

	unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);

	return used_blocks >= atomic_read(&sdp->sd_log_thresh2);

	return used_blocks + atomic_read(&sdp->sd_log_blks_needed) >=

		atomic_read(&sdp->sd_log_thresh2);

}



/**
@@ -913,12 +918,15 @@ int gfs2_logd(void *data) 
	struct gfs2_sbd *sdp = data;

	unsigned long t = 1;

	DEFINE_WAIT(wait);

	bool did_flush;



	while (!kthread_should_stop()) {



		did_flush = false;

		if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {

			gfs2_ail1_empty(sdp);

			gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);

			did_flush = true;

		}



		if (gfs2_ail_flush_reqd(sdp)) {
@@ -926,9 +934,10 @@ int gfs2_logd(void *data) 
			gfs2_ail1_wait(sdp);

			gfs2_ail1_empty(sdp);

			gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);

			did_flush = true;

		}



		if (!gfs2_ail_flush_reqd(sdp))

		if (!gfs2_ail_flush_reqd(sdp) || did_flush)

			wake_up(&sdp->sd_log_waitq);



		t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;

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