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authorLinus Torvalds <torvalds@linux-foundation.org>2018-02-03 13:14:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-03 13:14:41 -0800
commit6ec4de89b478043aa1c33f89f68f62ebf61b3e43 (patch)
treeb12bd5cc52adb750af7330f9de80ec74640d087d
parentabbbd0211ddfc6e525b00b3c8c84032f705e4a5d (diff)
parent7ac07fdaf840f9b141c6d5c286805107227c0e68 (diff)
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
-rw-r--r--fs/gfs2/Kconfig3
-rw-r--r--fs/gfs2/glock.c65
2 files changed, 44 insertions, 24 deletions
diff --git a/fs/gfs2/Kconfig b/fs/gfs2/Kconfig
index c0225d4b5435..3ed2b088dcfd 100644
--- a/fs/gfs2/Kconfig
+++ b/fs/gfs2/Kconfig
@@ -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
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 90af87ff29ba..82fb5583445c 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -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);
}