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authorAndreas Gruenbacher <agruenba@redhat.com>2021-02-08 22:44:26 +0300
committerAndreas Gruenbacher <agruenba@redhat.com>2021-02-17 21:30:28 +0300
commit9e514605c77451745ea9fca5a26fc3153893686a (patch)
treea1de848996ddcb7f19c564c153e79b3d493fa76e /fs/gfs2/rgrp.c
parent725d0e9d464d567cd9290e29879d8bffc92013f8 (diff)
downloadlinux-9e514605c77451745ea9fca5a26fc3153893686a.tar.xz
gfs2: Add local resource group locking
Prepare for treating resource group glocks as exclusive among nodes but shared among all tasks running on a node: introduce another layer of node-specific locking that the local tasks can use to coordinate their accesses. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2/rgrp.c')
-rw-r--r--fs/gfs2/rgrp.c54
1 files changed, 48 insertions, 6 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index f1df5e75364a..f45b787307d0 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -920,6 +920,7 @@ static int read_rindex_entry(struct gfs2_inode *ip)
rgd->rd_data = be32_to_cpu(buf.ri_data);
rgd->rd_bitbytes = be32_to_cpu(buf.ri_bitbytes);
spin_lock_init(&rgd->rd_rsspin);
+ mutex_init(&rgd->rd_mutex);
error = compute_bitstructs(rgd);
if (error)
@@ -1449,9 +1450,11 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
/* Trim each bitmap in the rgrp */
for (x = 0; x < rgd->rd_length; x++) {
struct gfs2_bitmap *bi = rgd->rd_bits + x;
+ rgrp_lock_local(rgd);
ret = gfs2_rgrp_send_discards(sdp,
rgd->rd_data0, NULL, bi, minlen,
&amt);
+ rgrp_unlock_local(rgd);
if (ret) {
gfs2_glock_dq_uninit(&gh);
goto out;
@@ -1463,9 +1466,11 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
ret = gfs2_trans_begin(sdp, RES_RG_HDR, 0);
if (ret == 0) {
bh = rgd->rd_bits[0].bi_bh;
+ rgrp_lock_local(rgd);
rgd->rd_flags |= GFS2_RGF_TRIMMED;
gfs2_trans_add_meta(rgd->rd_gl, bh);
gfs2_rgrp_out(rgd, bh->b_data);
+ rgrp_unlock_local(rgd);
gfs2_trans_end(sdp);
}
}
@@ -2050,7 +2055,8 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrpd *begin = NULL;
struct gfs2_blkreserv *rs = &ip->i_res;
- int error = 0, rg_locked, flags = 0;
+ int error = 0, flags = 0;
+ bool rg_locked;
u64 last_unlinked = NO_BLOCK;
u32 target = ap->target;
int loops = 0;
@@ -2079,10 +2085,10 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
while (loops < 3) {
struct gfs2_rgrpd *rgd;
- rg_locked = 1;
-
- if (!gfs2_glock_is_locked_by_me(rs->rs_rgd->rd_gl)) {
- rg_locked = 0;
+ rg_locked = gfs2_glock_is_locked_by_me(rs->rs_rgd->rd_gl);
+ if (rg_locked) {
+ rgrp_lock_local(rs->rs_rgd);
+ } else {
if (skip && skip--)
goto next_rgrp;
if (!gfs2_rs_active(rs)) {
@@ -2099,12 +2105,14 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
&ip->i_rgd_gh);
if (unlikely(error))
return error;
+ rgrp_lock_local(rs->rs_rgd);
if (!gfs2_rs_active(rs) && (loops < 2) &&
gfs2_rgrp_congested(rs->rs_rgd, loops))
goto skip_rgrp;
if (sdp->sd_args.ar_rgrplvb) {
error = update_rgrp_lvb(rs->rs_rgd);
if (unlikely(error)) {
+ rgrp_unlock_local(rs->rs_rgd);
gfs2_glock_dq_uninit(&ip->i_rgd_gh);
return error;
}
@@ -2142,6 +2150,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
rs->rs_reserved = blocks_available;
rgd->rd_reserved += rs->rs_reserved;
spin_unlock(&rgd->rd_rsspin);
+ rgrp_unlock_local(rs->rs_rgd);
return 0;
check_rgrp:
/* Check for unlinked inodes which can be reclaimed */
@@ -2149,6 +2158,8 @@ check_rgrp:
try_rgrp_unlink(rs->rs_rgd, &last_unlinked,
ip->i_no_addr);
skip_rgrp:
+ rgrp_unlock_local(rs->rs_rgd);
+
/* Drop reservation, if we couldn't use reserved rgrp */
if (gfs2_rs_active(rs))
gfs2_rs_deltree(rs);
@@ -2293,6 +2304,7 @@ void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_rgrpd *rgd,
struct gfs2_blkreserv *trs;
const struct rb_node *n;
+ spin_lock(&rgd->rd_rsspin);
gfs2_print_dbg(seq, "%s R: n:%llu f:%02x b:%u/%u i:%u q:%u r:%u e:%u\n",
fs_id_buf,
(unsigned long long)rgd->rd_addr, rgd->rd_flags,
@@ -2306,7 +2318,6 @@ void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_rgrpd *rgd,
be32_to_cpu(rgl->rl_free),
be32_to_cpu(rgl->rl_dinodes));
}
- spin_lock(&rgd->rd_rsspin);
for (n = rb_first(&rgd->rd_rstree); n; n = rb_next(&trs->rs_node)) {
trs = rb_entry(n, struct gfs2_blkreserv, rs_node);
dump_rs(seq, trs, fs_id_buf);
@@ -2421,6 +2432,7 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
BUG_ON(ip->i_res.rs_reserved < *nblocks);
+ rgrp_lock_local(rbm.rgd);
if (gfs2_rs_active(&ip->i_res)) {
gfs2_set_alloc_start(&rbm, ip, dinode);
error = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, &minext, &ip->i_res, false);
@@ -2477,6 +2489,7 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
gfs2_trans_add_meta(rbm.rgd->rd_gl, rbm.rgd->rd_bits[0].bi_bh);
gfs2_rgrp_out(rbm.rgd, rbm.rgd->rd_bits[0].bi_bh->b_data);
+ rgrp_unlock_local(rbm.rgd);
gfs2_statfs_change(sdp, 0, -(s64)*nblocks, dinode ? 1 : 0);
if (dinode)
@@ -2490,6 +2503,7 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
return 0;
rgrp_error:
+ rgrp_unlock_local(rbm.rgd);
gfs2_rgrp_error(rbm.rgd);
return -EIO;
}
@@ -2509,12 +2523,14 @@ void __gfs2_free_blocks(struct gfs2_inode *ip, struct gfs2_rgrpd *rgd,
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ rgrp_lock_local(rgd);
rgblk_free(sdp, rgd, bstart, blen, GFS2_BLKST_FREE);
trace_gfs2_block_alloc(ip, rgd, bstart, blen, GFS2_BLKST_FREE);
rgd->rd_free += blen;
rgd->rd_flags &= ~GFS2_RGF_TRIMMED;
gfs2_trans_add_meta(rgd->rd_gl, rgd->rd_bits[0].bi_bh);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
+ rgrp_unlock_local(rgd);
/* Directories keep their data in the metadata address space */
if (meta || ip->i_depth || gfs2_is_jdata(ip))
@@ -2550,17 +2566,20 @@ void gfs2_unlink_di(struct inode *inode)
rgd = gfs2_blk2rgrpd(sdp, blkno, true);
if (!rgd)
return;
+ rgrp_lock_local(rgd);
rgblk_free(sdp, rgd, blkno, 1, GFS2_BLKST_UNLINKED);
trace_gfs2_block_alloc(ip, rgd, blkno, 1, GFS2_BLKST_UNLINKED);
gfs2_trans_add_meta(rgd->rd_gl, rgd->rd_bits[0].bi_bh);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
be32_add_cpu(&rgd->rd_rgl->rl_unlinked, 1);
+ rgrp_unlock_local(rgd);
}
void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = rgd->rd_sbd;
+ rgrp_lock_local(rgd);
rgblk_free(sdp, rgd, ip->i_no_addr, 1, GFS2_BLKST_FREE);
if (!rgd->rd_dinodes)
gfs2_consist_rgrpd(rgd);
@@ -2569,6 +2588,7 @@ void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
gfs2_trans_add_meta(rgd->rd_gl, rgd->rd_bits[0].bi_bh);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
+ rgrp_unlock_local(rgd);
be32_add_cpu(&rgd->rd_rgl->rl_unlinked, -1);
gfs2_statfs_change(sdp, 0, +1, -1);
@@ -2583,6 +2603,10 @@ void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
* @no_addr: The block number to check
* @type: The block type we are looking for
*
+ * The inode glock of @no_addr must be held. The @type to check for is either
+ * GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; checking for type GFS2_BLKST_FREE
+ * or GFS2_BLKST_USED would make no sense.
+ *
* Returns: 0 if the block type matches the expected type
* -ESTALE if it doesn't match
* or -ve errno if something went wrong while checking
@@ -2606,6 +2630,13 @@ int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr, unsigned int type)
rbm.rgd = rgd;
error = gfs2_rbm_from_block(&rbm, no_addr);
if (!WARN_ON_ONCE(error)) {
+ /*
+ * No need to take the local resource group lock here; the
+ * inode glock of @no_addr provides the necessary
+ * synchronization in case the block is an inode. (In case
+ * the block is not an inode, the block type will not match
+ * the @type we are looking for.)
+ */
if (gfs2_testbit(&rbm, false) != type)
error = -ESTALE;
}
@@ -2730,3 +2761,14 @@ void gfs2_rlist_free(struct gfs2_rgrp_list *rlist)
}
}
+void rgrp_lock_local(struct gfs2_rgrpd *rgd)
+{
+ BUG_ON(!gfs2_glock_is_held_excl(rgd->rd_gl) &&
+ !test_bit(SDF_NORECOVERY, &rgd->rd_sbd->sd_flags));
+ mutex_lock(&rgd->rd_mutex);
+}
+
+void rgrp_unlock_local(struct gfs2_rgrpd *rgd)
+{
+ mutex_unlock(&rgd->rd_mutex);
+}