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authorIlya Dryomov <idryomov@gmail.com>2016-04-29 19:54:20 +0200
committerIlya Dryomov <idryomov@gmail.com>2016-05-26 00:36:22 +0200
commitd30291b985d1854565d7f2c82a4457869d5265e8 (patch)
tree43b99c978c5e4ea321d72590dfeebd42c10de28e /net
parent711da55d36a6f1eddcd340969be7223110d2f6b0 (diff)
downloadlinux-sh-d30291b985d1854565d7f2c82a4457869d5265e8.tar.gz
libceph: variable-sized ceph_object_id
Currently ceph_object_id can hold object names of up to 100 (CEPH_MAX_OID_NAME_LEN) characters. This is enough for all use cases, expect one - long rbd image names: - a format 1 header is named "<imgname>.rbd" - an object that points to a format 2 header is named "rbd_id.<imgname>" We operate on these potentially long-named objects during rbd map, and, for format 1 images, during header refresh. (A format 2 header name is a small system-generated string.) Lift this 100 character limit by making ceph_object_id be able to point to an externally-allocated string. Apart from being able to work with almost arbitrarily-long named objects, this allows us to reduce the size of ceph_object_id from >100 bytes to 64 bytes. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/debugfs.c2
-rw-r--r--net/ceph/osd_client.c16
-rw-r--r--net/ceph/osdmap.c93
3 files changed, 103 insertions, 8 deletions
diff --git a/net/ceph/debugfs.c b/net/ceph/debugfs.c
index b902fbc7863e..6f8413293d15 100644
--- a/net/ceph/debugfs.c
+++ b/net/ceph/debugfs.c
@@ -161,7 +161,7 @@ static int osdc_show(struct seq_file *s, void *pp)
req->r_osd ? req->r_osd->o_osd : -1,
req->r_pgid.pool, req->r_pgid.seed);
- seq_printf(s, "%.*s", req->r_base_oid.name_len,
+ seq_printf(s, "%*pE", req->r_base_oid.name_len,
req->r_base_oid.name);
if (req->r_reassert_version.epoch)
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 75e27bd3d372..95910aed8e2e 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -334,7 +334,10 @@ static void ceph_osdc_release_request(struct kref *kref)
for (which = 0; which < req->r_num_ops; which++)
osd_req_op_data_release(req, which);
+ ceph_oid_destroy(&req->r_base_oid);
+ ceph_oid_destroy(&req->r_target_oid);
ceph_put_snap_context(req->r_snapc);
+
if (req->r_mempool)
mempool_free(req, req->r_osdc->req_mempool);
else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
@@ -401,7 +404,9 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
INIT_LIST_HEAD(&req->r_req_lru_item);
INIT_LIST_HEAD(&req->r_osd_item);
+ ceph_oid_init(&req->r_base_oid);
req->r_base_oloc.pool = -1;
+ ceph_oid_init(&req->r_target_oid);
req->r_target_oloc.pool = -1;
dout("%s req %p\n", __func__, req);
@@ -415,6 +420,8 @@ int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
struct ceph_msg *msg;
int msg_size;
+ WARN_ON(ceph_oid_empty(&req->r_base_oid));
+
/* create request message */
msg_size = 4 + 4 + 4; /* client_inc, osdmap_epoch, flags */
msg_size += 4 + 4 + 4 + 8; /* mtime, reassert_version */
@@ -859,10 +866,7 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
}
req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
-
- snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
- "%llx.%08llx", vino.ino, objnum);
- req->r_base_oid.name_len = strlen(req->r_base_oid.name);
+ ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
r = ceph_osdc_alloc_messages(req, GFP_NOFS);
if (r)
@@ -1410,7 +1414,7 @@ static int __calc_request_pg(struct ceph_osdmap *osdmap,
req->r_target_oloc = req->r_base_oloc; /* struct */
need_check_tiering = true;
}
- if (req->r_target_oid.name_len == 0) {
+ if (ceph_oid_empty(&req->r_target_oid)) {
ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
need_check_tiering = true;
}
@@ -2501,7 +2505,7 @@ void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
/* oid */
ceph_encode_32(&p, req->r_base_oid.name_len);
memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
- dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
+ dout("oid %*pE len %d\n", req->r_base_oid.name_len,
req->r_base_oid.name, req->r_base_oid.name_len);
p += req->r_base_oid.name_len;
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 243574c8cf33..4668b871ca47 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1381,8 +1381,99 @@ bad:
return ERR_PTR(err);
}
+void ceph_oid_copy(struct ceph_object_id *dest,
+ const struct ceph_object_id *src)
+{
+ WARN_ON(!ceph_oid_empty(dest));
+
+ if (src->name != src->inline_name) {
+ /* very rare, see ceph_object_id definition */
+ dest->name = kmalloc(src->name_len + 1,
+ GFP_NOIO | __GFP_NOFAIL);
+ }
+ memcpy(dest->name, src->name, src->name_len + 1);
+ dest->name_len = src->name_len;
+}
+EXPORT_SYMBOL(ceph_oid_copy);
+static __printf(2, 0)
+int oid_printf_vargs(struct ceph_object_id *oid, const char *fmt, va_list ap)
+{
+ int len;
+
+ WARN_ON(!ceph_oid_empty(oid));
+
+ len = vsnprintf(oid->inline_name, sizeof(oid->inline_name), fmt, ap);
+ if (len >= sizeof(oid->inline_name))
+ return len;
+
+ oid->name_len = len;
+ return 0;
+}
+
+/*
+ * If oid doesn't fit into inline buffer, BUG.
+ */
+void ceph_oid_printf(struct ceph_object_id *oid, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ BUG_ON(oid_printf_vargs(oid, fmt, ap));
+ va_end(ap);
+}
+EXPORT_SYMBOL(ceph_oid_printf);
+
+static __printf(3, 0)
+int oid_aprintf_vargs(struct ceph_object_id *oid, gfp_t gfp,
+ const char *fmt, va_list ap)
+{
+ va_list aq;
+ int len;
+
+ va_copy(aq, ap);
+ len = oid_printf_vargs(oid, fmt, aq);
+ va_end(aq);
+
+ if (len) {
+ char *external_name;
+
+ external_name = kmalloc(len + 1, gfp);
+ if (!external_name)
+ return -ENOMEM;
+
+ oid->name = external_name;
+ WARN_ON(vsnprintf(oid->name, len + 1, fmt, ap) != len);
+ oid->name_len = len;
+ }
+
+ return 0;
+}
+
+/*
+ * If oid doesn't fit into inline buffer, allocate.
+ */
+int ceph_oid_aprintf(struct ceph_object_id *oid, gfp_t gfp,
+ const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = oid_aprintf_vargs(oid, gfp, fmt, ap);
+ va_end(ap);
+
+ return ret;
+}
+EXPORT_SYMBOL(ceph_oid_aprintf);
+
+void ceph_oid_destroy(struct ceph_object_id *oid)
+{
+ if (oid->name != oid->inline_name)
+ kfree(oid->name);
+}
+EXPORT_SYMBOL(ceph_oid_destroy);
/*
* calculate file layout from given offset, length.
@@ -1474,7 +1565,7 @@ int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
pg_out->seed = ceph_str_hash(pi->object_hash, oid->name,
oid->name_len);
- dout("%s '%.*s' pgid %llu.%x\n", __func__, oid->name_len, oid->name,
+ dout("%s %*pE pgid %llu.%x\n", __func__, oid->name_len, oid->name,
pg_out->pool, pg_out->seed);
return 0;
}