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Andreas Gruenbacher wrote two additional patches that we would like

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merged in this time. Both are regressions:
 
 1. The first fixes another kernel build dependency problem.
 2. The second fixes a performance regression in glock dumps.
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Merge tag 'gfs2-4.16.fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull GFS2 fixes from Bob Peterson:
 "Andreas Gruenbacher wrote two additional patches that we would like
  merged in this time. Both are regressions:

   - fix another kernel build dependency problem

   - fix a performance regression in glock dumps"

* tag 'gfs2-4.16.fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Glock dump performance regression fix
  gfs2: Fix the crc32c dependency
This commit is contained in:
Linus Torvalds 2018-02-03 13:14:41 -08:00
commit 6ec4de89b4
2 changed files with 44 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/gfs2/Kconfig
View File

@ -3,8 +3,7 @@ config GFS2_FS
depends on (64BIT || LBDAF)
select FS_POSIX_ACL
select CRC32
select CRYPTO
select CRYPTO_CRC32C
select LIBCRC32C
select QUOTACTL
select FS_IOMAP
help

65
fs/gfs2/glock.c
View File

@ -1921,19 +1921,29 @@ void gfs2_glock_exit(void)
destroy_workqueue(gfs2_delete_workqueue);
}
static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi, loff_t n)
{
while ((gi->gl = rhashtable_walk_next(&gi->hti))) {
if (IS_ERR(gi->gl)) {
if (PTR_ERR(gi->gl) == -EAGAIN)
continue;
gi->gl = NULL;
return;
if (n == 0)
gi->gl = rhashtable_walk_peek(&gi->hti);
else {
gi->gl = rhashtable_walk_next(&gi->hti);
n--;
}
for (;;) {
if (IS_ERR_OR_NULL(gi->gl)) {
if (!gi->gl)
return;
if (PTR_ERR(gi->gl) != -EAGAIN) {
gi->gl = NULL;
return;
}
n = 0;
} else if (gi->sdp == gi->gl->gl_name.ln_sbd &&
!__lockref_is_dead(&gi->gl->gl_lockref)) {
if (!n--)
break;
}
/* Skip entries for other sb and dead entries */
if (gi->sdp == gi->gl->gl_name.ln_sbd &&
!__lockref_is_dead(&gi->gl->gl_lockref))
return;
gi->gl = rhashtable_walk_next(&gi->hti);
}
}
@ -1941,18 +1951,24 @@ static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
struct gfs2_glock_iter *gi = seq->private;
loff_t n = *pos;
loff_t n;
rhashtable_walk_enter(&gl_hash_table, &gi->hti);
if (rhashtable_walk_start_check(&gi->hti) != 0)
return NULL;
/*
* We can either stay where we are, skip to the next hash table
* entry, or start from the beginning.
*/
if (*pos < gi->last_pos) {
rhashtable_walk_exit(&gi->hti);
rhashtable_walk_enter(&gl_hash_table, &gi->hti);
n = *pos + 1;
} else {
n = *pos - gi->last_pos;
}
do {
gfs2_glock_iter_next(gi);
} while (gi->gl && n--);
rhashtable_walk_start(&gi->hti);
gfs2_glock_iter_next(gi, n);
gi->last_pos = *pos;
return gi->gl;
}
@ -1963,8 +1979,7 @@ static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr,
(*pos)++;
gi->last_pos = *pos;
gfs2_glock_iter_next(gi);
gfs2_glock_iter_next(gi, 1);
return gi->gl;
}
@ -1975,7 +1990,6 @@ static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr)
gi->gl = NULL;
rhashtable_walk_stop(&gi->hti);
rhashtable_walk_exit(&gi->hti);
}
static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr)
@ -2041,7 +2055,13 @@ static int __gfs2_glocks_open(struct inode *inode, struct file *file,
seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
if (seq->buf)
seq->size = GFS2_SEQ_GOODSIZE;
/*
* Initially, we are "before" the first hash table entry; the
* first call to rhashtable_walk_next gets us the first entry.
*/
gi->last_pos = -1;
gi->gl = NULL;
rhashtable_walk_enter(&gl_hash_table, &gi->hti);
}
return ret;
}
@ -2057,6 +2077,7 @@ static int gfs2_glocks_release(struct inode *inode, struct file *file)
struct gfs2_glock_iter *gi = seq->private;
gi->gl = NULL;
rhashtable_walk_exit(&gi->hti);
return seq_release_private(inode, file);
}