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| author | Yan, Zheng <zyan@redhat.com> | 2014-09-16 17:50:45 +0800 |
|---|---|---|
| committer | Sage Weil <sage@redhat.com> | 2014-10-14 12:56:48 -0700 |
| commit | e4339d28f640a7c0d92903bcf389a2dfa281270d (patch) | |
| tree | 428c172af1081d29613732cdcf7801f958be358f /net | |
| parent | 0abb43dcacb52145aa265f82c914375d59dfe2da (diff) | |
| download | linux-e4339d28f640a7c0d92903bcf389a2dfa281270d.tar.gz linux-e4339d28f640a7c0d92903bcf389a2dfa281270d.tar.bz2 linux-e4339d28f640a7c0d92903bcf389a2dfa281270d.zip | |
libceph: reference counting pagelist
this allow pagelist to present data that may be sent multiple times.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ceph/messenger.c | 4 | ||||
| -rw-r--r-- | net/ceph/pagelist.c | 7 |
2 files changed, 6 insertions, 5 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index e7d94113f2d6..9764c771cfb1 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -3071,10 +3071,8 @@ static void ceph_msg_data_destroy(struct ceph_msg_data *data) return; WARN_ON(!list_empty(&data->links)); - if (data->type == CEPH_MSG_DATA_PAGELIST) { + if (data->type == CEPH_MSG_DATA_PAGELIST) ceph_pagelist_release(data->pagelist); - kfree(data->pagelist); - } kmem_cache_free(ceph_msg_data_cache, data); } diff --git a/net/ceph/pagelist.c b/net/ceph/pagelist.c index 92866bebb65f..c7c220a736e5 100644 --- a/net/ceph/pagelist.c +++ b/net/ceph/pagelist.c @@ -1,5 +1,6 @@ #include <linux/module.h> #include <linux/gfp.h> +#include <linux/slab.h> #include <linux/pagemap.h> #include <linux/highmem.h> #include <linux/ceph/pagelist.h> @@ -13,8 +14,10 @@ static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl) } } -int ceph_pagelist_release(struct ceph_pagelist *pl) +void ceph_pagelist_release(struct ceph_pagelist *pl) { + if (!atomic_dec_and_test(&pl->refcnt)) + return; ceph_pagelist_unmap_tail(pl); while (!list_empty(&pl->head)) { struct page *page = list_first_entry(&pl->head, struct page, @@ -23,7 +26,7 @@ int ceph_pagelist_release(struct ceph_pagelist *pl) __free_page(page); } ceph_pagelist_free_reserve(pl); - return 0; + kfree(pl); } EXPORT_SYMBOL(ceph_pagelist_release); |