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libdm: add some comments about DM_UDEV_DISABLE_LIBRARY_FALLBACK flag

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This commit is contained in:
Peter Rajnoha 2016-08-23 15:57:47 +02:00
parent b975532433
commit db0e34535c
1 changed files with 13 additions and 1 deletions
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14
libdm/libdevmapper.h
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@ -216,6 +216,7 @@ int dm_task_set_major_minor(struct dm_task *dmt, int major, int minor, int allow
int dm_task_set_uid(struct dm_task *dmt, uid_t uid);
int dm_task_set_gid(struct dm_task *dmt, gid_t gid);
int dm_task_set_mode(struct dm_task *dmt, mode_t mode);
/* See also description for DM_UDEV_DISABLE_LIBRARY_FALLBACK flag! */
int dm_task_set_cookie(struct dm_task *dmt, uint32_t *cookie, uint16_t flags);
int dm_task_set_event_nr(struct dm_task *dmt, uint32_t event_nr);
int dm_task_set_geometry(struct dm_task *dmt, const char *cylinders, const char *heads, const char *sectors, const char *start);
@ -3496,7 +3497,18 @@ struct dm_pool *dm_config_memory(struct dm_config_tree *cft);
* DM_UDEV_DISABLE_LIBRARY_FALLBACK is set in case we need to disable
* libdevmapper's node management. We will rely on udev completely
* and there will be no fallback action provided by libdevmapper if
* udev does something improperly.
* udev does something improperly. Using the library fallback code has
* a consequence that you need to take into account: any device node
* or symlink created without udev is not recorded in udev database
* which other applications may read to get complete list of devices.
* For this reason, use of DM_UDEV_DISABLE_LIBRARY_FALLBACK is
* recommended on systems where udev is used. Keep library fallback
* enabled just for exceptional cases where you need to debug udev-related
* problems. If you hit such problems, please contact us through upstream
* LVM2 development mailing list (see also README file). This flag is
* currently not set by default in libdevmapper so you need to set it
* explicitly if you're sure that udev is behaving correctly on your
* setups.
*/
#define DM_UDEV_DISABLE_LIBRARY_FALLBACK 0x0020
/*