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The dm_stats_delete_region() call removes a region from the bound device, and, if the region is grouped, from the group leader group descriptor stored in aux_data. To do this requires a listed handle: previous versions of the library do not since no dependencies exist between regions without grouping. This leads to strange behaviour when a command built against an old version of the library is used with one supporting groups. Deleting a region with dmstats succeeds, but logs errors: # dmstats list Name RgID RgSta RgSiz #Areas ArSize ProgID vg_hex-root 0 0 1.00g 1 1.00g dmstats vg_hex-root 1 1.00g 1.00g 1 1.00g dmstats vg_hex-root 2 2.00g 1.00g 1 1.00g dmstats # dmstats delete --regionid 2 vg_hex/root Region ID 2 does not exist Could not delete statistics region. Command failed # dmstats list Name RgID RgSta RgSiz #Areas ArSize ProgID vg_hex-root 0 0 1.00g 1 1.00g dmstats vg_hex-root 1 1.00g 1.00g 1 1.00g dmstats This happens because the call to dm_stats_delete_region() is inside a dm_stats_walk_*() iterator: upon entry to the call, the iterator is at its end conditions and about to terminate. Due to the call to dm_stats_list() inside the function, it returns with an iterator at the beginning of a walk and performs a further iteration before exiting. This final loop makes a further attempt to delete the (already deleted) region, leading to the confusing error messages. |
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| .. | ||
| datastruct | ||
| ioctl | ||
| misc | ||
| mm | ||
| regex | ||
| .exported_symbols | ||
| .exported_symbols.Base | ||
| .exported_symbols.DM_1_02_97 | ||
| .exported_symbols.DM_1_02_98 | ||
| .exported_symbols.DM_1_02_99 | ||
| .exported_symbols.DM_1_02_100 | ||
| .exported_symbols.DM_1_02_101 | ||
| .exported_symbols.DM_1_02_103 | ||
| .exported_symbols.DM_1_02_104 | ||
| .exported_symbols.DM_1_02_105 | ||
| .exported_symbols.DM_1_02_106 | ||
| .exported_symbols.DM_1_02_107 | ||
| .exported_symbols.DM_1_02_110 | ||
| .exported_symbols.DM_1_02_113 | ||
| .exported_symbols.DM_1_02_124 | ||
| .exported_symbols.DM_1_02_128 | ||
| .exported_symbols.DM_1_02_129 | ||
| .exported_symbols.DM_1_02_131 | ||
| .exported_symbols.DM_1_02_133 | ||
| .exported_symbols.DM_1_02_135 | ||
| libdevmapper.h | ||
| libdevmapper.pc.in | ||
| libdm-common.c | ||
| libdm-common.h | ||
| libdm-config.c | ||
| libdm-deptree.c | ||
| libdm-file.c | ||
| libdm-report.c | ||
| libdm-stats.c | ||
| libdm-string.c | ||
| libdm-targets.c | ||
| libdm-timestamp.c | ||
| Makefile.in | ||