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ceph: specify max_bytes on readdir replies

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Specify max bytes in request to bound size of reply.  Add associated
mount option with default value of 512 KB.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-05-14 13:06:30 -07:00
parent 366837706b
commit 23804d91f1
4 changed files with 14 additions and 1 deletions
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1
fs/ceph/ceph_fs.h
View file

@ -361,6 +361,7 @@ union ceph_mds_request_args {
struct {
__le32 frag; /* which dir fragment */
__le32 max_entries; /* how many dentries to grab */
__le32 max_bytes;
} __attribute__ ((packed)) readdir;
struct {
__le32 mode;

2
fs/ceph/dir.c
View file

@ -233,6 +233,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
u32 ftype;
struct ceph_mds_reply_info_parsed *rinfo;
const int max_entries = client->mount_args->max_readdir;
const int max_bytes = client->mount_args->max_readdir_bytes;
dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
if (fi->at_end)
@ -316,6 +317,7 @@ more:
req->r_readdir_offset = fi->next_offset;
req->r_args.readdir.frag = cpu_to_le32(frag);
req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
req->r_num_caps = max_entries + 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (err < 0) {

8
fs/ceph/super.c
View file

@ -190,6 +190,8 @@ static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
args->cap_release_safety);
if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT)
seq_printf(m, ",readdir_max_entries=%d", args->max_readdir);
if (args->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
seq_printf(m, ",readdir_max_bytes=%d", args->max_readdir_bytes);
if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
seq_printf(m, ",snapdirname=%s", args->snapdir_name);
if (args->name)
@ -333,6 +335,7 @@ enum {
Opt_caps_wanted_delay_max,
Opt_cap_release_safety,
Opt_readdir_max_entries,
Opt_readdir_max_bytes,
Opt_congestion_kb,
Opt_last_int,
/* int args above */
@ -365,6 +368,7 @@ static match_table_t arg_tokens = {
{Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
{Opt_cap_release_safety, "cap_release_safety=%d"},
{Opt_readdir_max_entries, "readdir_max_entries=%d"},
{Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
{Opt_congestion_kb, "write_congestion_kb=%d"},
/* int args above */
{Opt_snapdirname, "snapdirname=%s"},
@ -415,6 +419,7 @@ static struct ceph_mount_args *parse_mount_args(int flags, char *options,
args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
args->max_readdir = CEPH_MAX_READDIR_DEFAULT;
args->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
args->congestion_kb = default_congestion_kb();
/* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
@ -522,6 +527,9 @@ static struct ceph_mount_args *parse_mount_args(int flags, char *options,
case Opt_readdir_max_entries:
args->max_readdir = intval;
break;
case Opt_readdir_max_bytes:
args->max_readdir_bytes = intval;
break;
case Opt_congestion_kb:
args->congestion_kb = intval;
break;

4
fs/ceph/super.h
View file

@ -66,7 +66,8 @@ struct ceph_mount_args {
int congestion_kb; /* max writeback in flight */
int caps_wanted_delay_min, caps_wanted_delay_max;
int cap_release_safety;
int max_readdir; /* max readdir size */
int max_readdir; /* max readdir result (entires) */
int max_readdir_bytes; /* max readdir result (bytes) */
char *snapdir_name; /* default ".snap" */
char *name;
char *secret;
@ -81,6 +82,7 @@ struct ceph_mount_args {
#define CEPH_OSD_IDLE_TTL_DEFAULT 60
#define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */
#define CEPH_MAX_READDIR_DEFAULT 1024
#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)