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libdm: symbol versioning with -flto
Gcc10 introduced different strategy how to build shared libraries with their new LTO optimizer. Insired by: https://akkadia.org/drepper/symbol-versioning https://sourceware.org/pipermail/elfutils-devel/attachments/20200414/1c0c2903/attachment.bin https://github.com/InBetweenNames/gentooLTO/issues/459 https://github.com/linux-rdma/rdma-core/blob/master/util/symver.h https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48200
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@ -247,11 +247,11 @@ bad:
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* Maintain backward compatibility with older versions that did not
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* accept a 'min_num_bits' argument to dm_bitset_parse_list().
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*/
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DM_EXPORT_SYMBOL(dm_bitset_parse_list, 1_02_129)
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dm_bitset_t dm_bitset_parse_list_v1_02_129(const char *str, struct dm_pool *mem);
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dm_bitset_t dm_bitset_parse_list_v1_02_129(const char *str, struct dm_pool *mem)
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{
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return dm_bitset_parse_list(str, mem, 0);
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}
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DM_EXPORT_SYMBOL(dm_bitset_parse_list, 1_02_129);
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#endif
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@ -709,7 +709,8 @@ int dm_format_dev(char *buf, int bufsize, uint32_t dev_major,
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return 1;
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}
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int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
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DM_EXPORT_NEW_SYMBOL(int, dm_task_get_info, 1_02_97)
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(struct dm_task *dmt, struct dm_info *info)
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{
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if (!dmt->dmi.v4)
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return 0;
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@ -2210,8 +2211,8 @@ void dm_lib_exit(void)
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* no code in this file accidentally calls it.
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*/
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DM_EXPORT_SYMBOL_BASE(dm_task_get_info)
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int dm_task_get_info_base(struct dm_task *dmt, struct dm_info *info);
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DM_EXPORT_SYMBOL_BASE(dm_task_get_info);
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int dm_task_get_info_base(struct dm_task *dmt, struct dm_info *info)
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{
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struct dm_info new_info;
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@ -3311,15 +3311,16 @@ int dm_tree_node_add_raid_target_with_params_v2(struct dm_tree_node *node,
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return 1;
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}
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int dm_tree_node_add_cache_target(struct dm_tree_node *node,
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uint64_t size,
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uint64_t feature_flags, /* DM_CACHE_FEATURE_* */
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const char *metadata_uuid,
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const char *data_uuid,
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const char *origin_uuid,
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const char *policy_name,
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const struct dm_config_node *policy_settings,
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uint32_t data_block_size)
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DM_EXPORT_NEW_SYMBOL(int, dm_tree_node_add_cache_target, 1_02_138)
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(struct dm_tree_node *node,
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uint64_t size,
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uint64_t feature_flags, /* DM_CACHE_FEATURE_* */
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const char *metadata_uuid,
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const char *data_uuid,
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const char *origin_uuid,
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const char *policy_name,
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const struct dm_config_node *policy_settings,
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uint32_t data_block_size)
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{
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struct dm_config_node *cn;
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struct load_segment *seg;
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@ -3858,8 +3859,8 @@ void dm_tree_node_set_callback(struct dm_tree_node *dnode,
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*/
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/* Backward compatible dm_tree_node_size_changed() implementations. */
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DM_EXPORT_SYMBOL_BASE(dm_tree_node_size_changed)
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int dm_tree_node_size_changed_base(const struct dm_tree_node *dnode);
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DM_EXPORT_SYMBOL_BASE(dm_tree_node_size_changed);
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int dm_tree_node_size_changed_base(const struct dm_tree_node *dnode)
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{
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/* Base does not make difference between smaller and bigger */
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@ -3874,6 +3875,7 @@ int dm_tree_node_size_changed_base(const struct dm_tree_node *dnode)
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* the new function dm_tree_node_add_cache_target which detects unknown
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* feature flags and returns error for them.
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*/
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DM_EXPORT_SYMBOL_BASE(dm_tree_node_add_cache_target)
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int dm_tree_node_add_cache_target_base(struct dm_tree_node *node,
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uint64_t size,
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uint64_t feature_flags, /* DM_CACHE_FEATURE_* */
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@ -3883,7 +3885,6 @@ int dm_tree_node_add_cache_target_base(struct dm_tree_node *node,
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const char *policy_name,
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const struct dm_config_node *policy_settings,
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uint32_t data_block_size);
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DM_EXPORT_SYMBOL_BASE(dm_tree_node_add_cache_target);
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int dm_tree_node_add_cache_target_base(struct dm_tree_node *node,
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uint64_t size,
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uint64_t feature_flags,
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@ -2011,10 +2011,11 @@ out:
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return r;
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}
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int dm_stats_create_region(struct dm_stats *dms, uint64_t *region_id,
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uint64_t start, uint64_t len, int64_t step,
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int precise, struct dm_histogram *bounds,
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const char *program_id, const char *user_data)
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DM_EXPORT_NEW_SYMBOL(int, dm_stats_create_region, 1_02_107)
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(struct dm_stats *dms, uint64_t *region_id,
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uint64_t start, uint64_t len, int64_t step,
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int precise, struct dm_histogram *bounds,
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const char *program_id, const char *user_data)
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{
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char *hist_arg = NULL;
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int r = 0;
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@ -2037,6 +2038,7 @@ out:
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return r;
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}
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static void _stats_clear_group_regions(struct dm_stats *dms, uint64_t group_id)
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{
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struct dm_stats_group *group;
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@ -5070,6 +5072,8 @@ int dm_stats_start_filemapd(int fd, uint64_t group_id, const char *path,
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*/
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#if defined(GNU_SYMVER)
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DM_EXPORT_SYMBOL(dm_stats_create_region, 1_02_106)
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int dm_stats_create_region_v1_02_106(struct dm_stats *dms, uint64_t *region_id,
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uint64_t start, uint64_t len, int64_t step,
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int precise, const char *program_id,
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@ -5083,8 +5087,8 @@ int dm_stats_create_region_v1_02_106(struct dm_stats *dms, uint64_t *region_id,
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return _stats_create_region(dms, region_id, start, len, step, precise,
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NULL, program_id, aux_data);
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}
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DM_EXPORT_SYMBOL(dm_stats_create_region, 1_02_106);
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DM_EXPORT_SYMBOL(dm_stats_create_region, 1_02_104)
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int dm_stats_create_region_v1_02_104(struct dm_stats *dms, uint64_t *region_id,
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uint64_t start, uint64_t len, int64_t step,
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const char *program_id, const char *aux_data);
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@ -5096,5 +5100,4 @@ int dm_stats_create_region_v1_02_104(struct dm_stats *dms, uint64_t *region_id,
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return _stats_create_region(dms, region_id, start, len, step, 0, NULL,
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program_id, aux_data);
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}
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DM_EXPORT_SYMBOL(dm_stats_create_region, 1_02_104);
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#endif
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@ -22,6 +22,7 @@
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/*
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* Symbol export control macros
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*
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* DM_EXPORT_NEW_SYMBOL(rettype, func, ver)
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* DM_EXPORT_SYMBOL(func,ver)
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* DM_EXPORT_SYMBOL_BASE(func,ver)
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*
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@ -40,19 +41,19 @@
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* compatibility version should be enclosed in '#if defined(GNU_SYMVER)',
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* for example:
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*
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* int dm_foo(int bar)
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* DM_EXPORT_NEW_SYMBOL(int, dm_foo, 1_02_107)(int bar)
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* {
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* return bar;
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* }
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*
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* #if defined(__GNUC__)
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* #if defined(GNU_SYMVER)
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* // Backward compatible dm_foo() version 1.02.104
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* DM_EXPORT_SYMBOL(dm_foo,1_02_104)
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* int dm_foo_v1_02_104(void);
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* int dm_foo_v1_02_104(void)
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* {
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* return 0;
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* }
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* DM_EXPORT_SYMBOL(dm_foo,1_02_104)
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* #endif
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*
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* A prototype for the compatibility version is required as these
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@ -63,11 +64,27 @@
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* versioning: it must never be used for new symbols.
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*/
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#if defined(GNU_SYMVER)
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# ifdef __has_attribute
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# if __has_attribute(symver)
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# define DM_EXPORT_NEW_SYMBOL(rettype, func, ver) \
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__attribute__((__symver__( #func "@@DM_" #ver ))) \
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__typeof__(func) func ##_v ##ver; \
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rettype func ##_v ##ver
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# define DM_EXPORT_SYMBOL(func, ver) \
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__attribute__((__symver__( #func "@DM_" #ver )))
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# define DM_EXPORT_SYMBOL_BASE(func) \
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__attribute__((__symver__( #func "@Base" )))
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# endif
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# endif
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#ifndef DM_EXPORT_NEW_SYMBOL
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#define DM_EXPORT_NEW_SYMBOL(rettype, func, ver) rettype func
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#define DM_EXPORT_SYMBOL(func, ver) \
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__asm__(".symver " #func "_v" #ver ", " #func "@DM_" #ver )
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__asm__(".symver " #func "_v" #ver ", " #func "@DM_" #ver );
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#define DM_EXPORT_SYMBOL_BASE(func) \
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__asm__(".symver " #func "_base, " #func "@Base" )
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__asm__(".symver " #func "_base, " #func "@Base" );
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#endif
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#else
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#define DM_EXPORT_NEW_SYMBOL(rettype, func, ver) rettype func
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#define DM_EXPORT_SYMBOL(func, ver)
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#define DM_EXPORT_SYMBOL_BASE(func)
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#endif
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