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0d9c1ab3be
Currently message data items are allocated with ceph_msg_data_create()
in setup_request_data() inside send_request(). send_request() has never
been allowed to fail, so each allocation is followed by a BUG_ON:
data = ceph_msg_data_create(...);
BUG_ON(!data);
It's been this way since support for multiple message data items was
added in commit 6644ed7b7e ("libceph: make message data be a pointer")
in 3.10.
There is no reason to delay the allocation of message data items until
the last possible moment and we certainly don't need a linked list of
them as they are only ever appended to the end and never erased. Make
ceph_msg_new2() take max_data_items and adapt the rest of the code.
Reported-by: Jerry Lee <leisurelysw24@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
28 lines
811 B
C
28 lines
811 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _FS_CEPH_MSGPOOL
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#define _FS_CEPH_MSGPOOL
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#include <linux/mempool.h>
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/*
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* we use memory pools for preallocating messages we may receive, to
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* avoid unexpected OOM conditions.
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*/
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struct ceph_msgpool {
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const char *name;
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mempool_t *pool;
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int type; /* preallocated message type */
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int front_len; /* preallocated payload size */
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int max_data_items;
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};
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int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
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int front_len, int max_data_items, int size,
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const char *name);
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extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
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struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,
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int max_data_items);
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extern void ceph_msgpool_put(struct ceph_msgpool *, struct ceph_msg *);
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#endif
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