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ceph: add mount option to limit caps count

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If number of caps exceed the limit, ceph_trim_dentires() also trim
dentries with valid leases. Trimming dentry releases references to
associated inode, which may evict inode and release caps.

By default, there is no limit for caps count.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng
2019-02-01 14:57:15 +08:00
committed by Ilya Dryomov
parent 37c4efc1dd
commit fe33032daa
8 changed files with 91 additions and 21 deletions
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12
fs/ceph/super.c
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@@ -133,6 +133,7 @@ enum {
Opt_rasize,
Opt_caps_wanted_delay_min,
Opt_caps_wanted_delay_max,
Opt_caps_max,
Opt_readdir_max_entries,
Opt_readdir_max_bytes,
Opt_congestion_kb,
@@ -175,6 +176,7 @@ static match_table_t fsopt_tokens = {
{Opt_rasize, "rasize=%d"},
{Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
{Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
{Opt_caps_max, "caps_max=%d"},
{Opt_readdir_max_entries, "readdir_max_entries=%d"},
{Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
{Opt_congestion_kb, "write_congestion_kb=%d"},
@@ -286,6 +288,11 @@ static int parse_fsopt_token(char *c, void *private)
return -EINVAL;
fsopt->caps_wanted_delay_max = intval;
break;
case Opt_caps_max:
if (intval < 0)
return -EINVAL;
fsopt->caps_max = intval;
break;
case Opt_readdir_max_entries:
if (intval < 1)
return -EINVAL;
@@ -576,6 +583,8 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root)
seq_printf(m, ",rasize=%d", fsopt->rasize);
if (fsopt->congestion_kb != default_congestion_kb())
seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
if (fsopt->caps_max)
seq_printf(m, ",caps_max=%d", fsopt->caps_max);
if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
seq_printf(m, ",caps_wanted_delay_min=%d",
fsopt->caps_wanted_delay_min);
@@ -683,9 +692,6 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
if (!fsc->wb_pagevec_pool)
goto fail_cap_wq;
/* caps */
fsc->min_caps = fsopt->max_readdir;
return fsc;
fail_cap_wq: