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@xxxxxxxxx>
---
drivers/block/rbd.c | 8 +++-
fs/ceph/addr.c | 6 +--
fs/ceph/file.c | 2 +-
fs/ceph/ioctl.c | 2 +-
include/linux/ceph/osdmap.h | 62 ++++++++++++++++++------------
net/ceph/debugfs.c | 2 +-
net/ceph/osd_client.c | 16 +++++---
net/ceph/osdmap.c | 93 ++++++++++++++++++++++++++++++++++++++++++++-
8 files changed, 150 insertions(+), 41 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index a90c9291cbf9..a41a44d08397 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1965,7 +1965,9 @@ static struct ceph_osd_request *rbd_osd_req_create(
osd_req->r_priv = obj_request;
osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout);
- ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name);
+ if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s",
+ obj_request->object_name))
+ goto fail;
if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO))
goto fail;
@@ -2017,7 +2019,9 @@ rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request)
osd_req->r_priv = obj_request;
osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout);
- ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name);
+ if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s",
+ obj_request->object_name))
+ goto fail;
if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO))
goto fail;
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 6fee7e0b8931..6f28dd9bacb2 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1758,9 +1758,7 @@ static int __ceph_pool_perm_get(struct ceph_inode_info *ci, u32 pool)
rd_req->r_flags = CEPH_OSD_FLAG_READ;
osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
rd_req->r_base_oloc.pool = pool;
- snprintf(rd_req->r_base_oid.name, sizeof(rd_req->r_base_oid.name),
- "%llx.00000000", ci->i_vino.ino);
- rd_req->r_base_oid.name_len = strlen(rd_req->r_base_oid.name);
+ ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
if (err)
@@ -1777,7 +1775,7 @@ static int __ceph_pool_perm_get(struct ceph_inode_info *ci, u32 pool)
CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK;
osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
wr_req->r_base_oloc.pool = pool;
- wr_req->r_base_oid = rd_req->r_base_oid;
+ ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
if (err)
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 5d46d106bbb7..9d470397e249 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -715,7 +715,7 @@ static void ceph_aio_retry_work(struct work_struct *work)
CEPH_OSD_FLAG_ONDISK |
CEPH_OSD_FLAG_WRITE;
req->r_base_oloc = orig_req->r_base_oloc;
- req->r_base_oid = orig_req->r_base_oid;
+ ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
if (ret) {
diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index f851d8d70158..db296709784a 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -213,7 +213,7 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
ceph_ino(inode), dl.object_no);
oloc.pool = ceph_file_layout_pg_pool(ci->i_layout);
- ceph_oid_set_name(&oid, dl.object_name);
+ ceph_oid_printf(&oid, "%s", dl.object_name);
r = ceph_oloc_oid_to_pg(osdc->osdmap, &oloc, &oid, &pgid);
if (r < 0) {
diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index e55c08bc3a96..777a29412706 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -64,11 +64,47 @@ struct ceph_object_locator {
*/
#define CEPH_MAX_OID_NAME_LEN 100
+/*
+ * 51-char inline_name is long enough for all cephfs and all but one
+ * rbd requests: <imgname> in "<imgname>.rbd"/"rbd_id.<imgname>" can be
+ * arbitrarily long (~PAGE_SIZE). It's done once during rbd map; all
+ * other rbd requests fit into inline_name.
+ *
+ * Makes ceph_object_id 64 bytes on 64-bit.
+ */
+#define CEPH_OID_INLINE_LEN 52
+
+/*
+ * Both inline and external buffers have space for a NUL-terminator,
+ * which is carried around. It's not required though - RADOS object
+ * names don't have to be NUL-terminated and may contain NULs.
+ */
struct ceph_object_id {
- char name[CEPH_MAX_OID_NAME_LEN];
+ char *name;
+ char inline_name[CEPH_OID_INLINE_LEN];
int name_len;
};
+static inline void ceph_oid_init(struct ceph_object_id *oid)
+{
+ oid->name = oid->inline_name;
+ oid->name_len = 0;
+}
+
+static inline bool ceph_oid_empty(const struct ceph_object_id *oid)
+{
+ return oid->name == oid->inline_name && !oid->name_len;
+}
+
+void ceph_oid_copy(struct ceph_object_id *dest,
+ const struct ceph_object_id *src);
+__printf(2, 3)
+void ceph_oid_printf(struct ceph_object_id *oid, const char *fmt, ...);
+__printf(3, 4)
+int ceph_oid_aprintf(struct ceph_object_id *oid, gfp_t gfp,
+ const char *fmt, ...);
+void ceph_oid_destroy(struct ceph_object_id *oid);
+
struct ceph_pg_mapping {
struct rb_node node;
struct ceph_pg pgid;
@@ -113,30 +149,6 @@ struct ceph_osdmap {
int crush_scratch_ary[CEPH_PG_MAX_SIZE * 3];
};
-static inline void ceph_oid_set_name(struct ceph_object_id *oid,
- const char *name)
-{
- int len;
-
- len = strlen(name);
- if (len > sizeof(oid->name)) {
- WARN(1, "ceph_oid_set_name '%s' len %d vs %zu, truncating\n",
- name, len, sizeof(oid->name));
- len = sizeof(oid->name);
- }
-
- memcpy(oid->name, name, len);
- oid->name_len = len;
-}
-
-static inline void ceph_oid_copy(struct ceph_object_id *dest,
- struct ceph_object_id *src)
-{
- BUG_ON(src->name_len > sizeof(dest->name));
- memcpy(dest->name, src->name, src->name_len);
- dest->name_len = src->name_len;
-}
-
static inline int ceph_osd_exists(struct ceph_osdmap *map, int osd)
{
return osd >= 0 && osd < map->max_osd &&
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;
}
--
2.4.3
--
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